Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Driver for 8250/16550-type serial ports |
3 | * | |
4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
5 | * | |
6 | * Copyright (C) 2001 Russell King. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
1da177e4 LT |
13 | * A note about mapbase / membase |
14 | * | |
15 | * mapbase is the physical address of the IO port. | |
16 | * membase is an 'ioremapped' cookie. | |
17 | */ | |
1da177e4 LT |
18 | |
19 | #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
20 | #define SUPPORT_SYSRQ | |
21 | #endif | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/console.h> | |
28 | #include <linux/sysrq.h> | |
1da177e4 | 29 | #include <linux/delay.h> |
d052d1be | 30 | #include <linux/platform_device.h> |
1da177e4 | 31 | #include <linux/tty.h> |
cd3ecad1 | 32 | #include <linux/ratelimit.h> |
1da177e4 | 33 | #include <linux/tty_flip.h> |
1da177e4 LT |
34 | #include <linux/serial_core.h> |
35 | #include <linux/serial.h> | |
36 | #include <linux/serial_8250.h> | |
78512ece | 37 | #include <linux/nmi.h> |
f392ecfa | 38 | #include <linux/mutex.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
0b4af1d9 | 40 | #include <linux/uaccess.h> |
6816383a PG |
41 | #ifdef CONFIG_SPARC |
42 | #include <linux/sunserialcore.h> | |
43 | #endif | |
1da177e4 LT |
44 | |
45 | #include <asm/io.h> | |
46 | #include <asm/irq.h> | |
47 | ||
48 | #include "8250.h" | |
49 | ||
50 | /* | |
51 | * Configuration: | |
40663cc7 | 52 | * share_irqs - whether we pass IRQF_SHARED to request_irq(). This option |
1da177e4 LT |
53 | * is unsafe when used on edge-triggered interrupts. |
54 | */ | |
408b664a | 55 | static unsigned int share_irqs = SERIAL8250_SHARE_IRQS; |
1da177e4 | 56 | |
a61c2d78 DJ |
57 | static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; |
58 | ||
8440838b DM |
59 | static struct uart_driver serial8250_reg; |
60 | ||
61 | static int serial_index(struct uart_port *port) | |
62 | { | |
63 | return (serial8250_reg.minor - 64) + port->line; | |
64 | } | |
65 | ||
d41a4b51 CE |
66 | static unsigned int skip_txen_test; /* force skip of txen test at init time */ |
67 | ||
1da177e4 LT |
68 | /* |
69 | * Debugging. | |
70 | */ | |
71 | #if 0 | |
72 | #define DEBUG_AUTOCONF(fmt...) printk(fmt) | |
73 | #else | |
74 | #define DEBUG_AUTOCONF(fmt...) do { } while (0) | |
75 | #endif | |
76 | ||
77 | #if 0 | |
78 | #define DEBUG_INTR(fmt...) printk(fmt) | |
79 | #else | |
80 | #define DEBUG_INTR(fmt...) do { } while (0) | |
81 | #endif | |
82 | ||
e7328ae1 | 83 | #define PASS_LIMIT 512 |
1da177e4 | 84 | |
bca47613 DH |
85 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
86 | ||
87 | ||
1da177e4 LT |
88 | #ifdef CONFIG_SERIAL_8250_DETECT_IRQ |
89 | #define CONFIG_SERIAL_DETECT_IRQ 1 | |
90 | #endif | |
1da177e4 LT |
91 | #ifdef CONFIG_SERIAL_8250_MANY_PORTS |
92 | #define CONFIG_SERIAL_MANY_PORTS 1 | |
93 | #endif | |
94 | ||
95 | /* | |
96 | * HUB6 is always on. This will be removed once the header | |
97 | * files have been cleaned. | |
98 | */ | |
99 | #define CONFIG_HUB6 1 | |
100 | ||
a4ed1e41 | 101 | #include <asm/serial.h> |
1da177e4 LT |
102 | /* |
103 | * SERIAL_PORT_DFNS tells us about built-in ports that have no | |
104 | * standard enumeration mechanism. Platforms that can find all | |
105 | * serial ports via mechanisms like ACPI or PCI need not supply it. | |
106 | */ | |
107 | #ifndef SERIAL_PORT_DFNS | |
108 | #define SERIAL_PORT_DFNS | |
109 | #endif | |
110 | ||
cb3592be | 111 | static const struct old_serial_port old_serial_port[] = { |
1da177e4 LT |
112 | SERIAL_PORT_DFNS /* defined in asm/serial.h */ |
113 | }; | |
114 | ||
026d02a2 | 115 | #define UART_NR CONFIG_SERIAL_8250_NR_UARTS |
1da177e4 LT |
116 | |
117 | #ifdef CONFIG_SERIAL_8250_RSA | |
118 | ||
119 | #define PORT_RSA_MAX 4 | |
120 | static unsigned long probe_rsa[PORT_RSA_MAX]; | |
121 | static unsigned int probe_rsa_count; | |
122 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
123 | ||
1da177e4 | 124 | struct irq_info { |
25db8ad5 AC |
125 | struct hlist_node node; |
126 | int irq; | |
127 | spinlock_t lock; /* Protects list not the hash */ | |
1da177e4 LT |
128 | struct list_head *head; |
129 | }; | |
130 | ||
25db8ad5 AC |
131 | #define NR_IRQ_HASH 32 /* Can be adjusted later */ |
132 | static struct hlist_head irq_lists[NR_IRQ_HASH]; | |
133 | static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */ | |
1da177e4 LT |
134 | |
135 | /* | |
136 | * Here we define the default xmit fifo size used for each type of UART. | |
137 | */ | |
138 | static const struct serial8250_config uart_config[] = { | |
139 | [PORT_UNKNOWN] = { | |
140 | .name = "unknown", | |
141 | .fifo_size = 1, | |
142 | .tx_loadsz = 1, | |
143 | }, | |
144 | [PORT_8250] = { | |
145 | .name = "8250", | |
146 | .fifo_size = 1, | |
147 | .tx_loadsz = 1, | |
148 | }, | |
149 | [PORT_16450] = { | |
150 | .name = "16450", | |
151 | .fifo_size = 1, | |
152 | .tx_loadsz = 1, | |
153 | }, | |
154 | [PORT_16550] = { | |
155 | .name = "16550", | |
156 | .fifo_size = 1, | |
157 | .tx_loadsz = 1, | |
158 | }, | |
159 | [PORT_16550A] = { | |
160 | .name = "16550A", | |
161 | .fifo_size = 16, | |
162 | .tx_loadsz = 16, | |
163 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
aef9a7bd | 164 | .rxtrig_bytes = {1, 4, 8, 14}, |
1da177e4 LT |
165 | .flags = UART_CAP_FIFO, |
166 | }, | |
167 | [PORT_CIRRUS] = { | |
168 | .name = "Cirrus", | |
169 | .fifo_size = 1, | |
170 | .tx_loadsz = 1, | |
171 | }, | |
172 | [PORT_16650] = { | |
173 | .name = "ST16650", | |
174 | .fifo_size = 1, | |
175 | .tx_loadsz = 1, | |
176 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
177 | }, | |
178 | [PORT_16650V2] = { | |
179 | .name = "ST16650V2", | |
180 | .fifo_size = 32, | |
181 | .tx_loadsz = 16, | |
182 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
183 | UART_FCR_T_TRIG_00, | |
aef9a7bd | 184 | .rxtrig_bytes = {8, 16, 24, 28}, |
1da177e4 LT |
185 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, |
186 | }, | |
187 | [PORT_16750] = { | |
188 | .name = "TI16750", | |
189 | .fifo_size = 64, | |
190 | .tx_loadsz = 64, | |
191 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 | | |
192 | UART_FCR7_64BYTE, | |
aef9a7bd | 193 | .rxtrig_bytes = {1, 16, 32, 56}, |
1da177e4 LT |
194 | .flags = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE, |
195 | }, | |
196 | [PORT_STARTECH] = { | |
197 | .name = "Startech", | |
198 | .fifo_size = 1, | |
199 | .tx_loadsz = 1, | |
200 | }, | |
201 | [PORT_16C950] = { | |
202 | .name = "16C950/954", | |
203 | .fifo_size = 128, | |
204 | .tx_loadsz = 128, | |
205 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
d0694e2a PM |
206 | /* UART_CAP_EFR breaks billionon CF bluetooth card. */ |
207 | .flags = UART_CAP_FIFO | UART_CAP_SLEEP, | |
1da177e4 LT |
208 | }, |
209 | [PORT_16654] = { | |
210 | .name = "ST16654", | |
211 | .fifo_size = 64, | |
212 | .tx_loadsz = 32, | |
213 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
214 | UART_FCR_T_TRIG_10, | |
aef9a7bd | 215 | .rxtrig_bytes = {8, 16, 56, 60}, |
1da177e4 LT |
216 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, |
217 | }, | |
218 | [PORT_16850] = { | |
219 | .name = "XR16850", | |
220 | .fifo_size = 128, | |
221 | .tx_loadsz = 128, | |
222 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
223 | .flags = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP, | |
224 | }, | |
225 | [PORT_RSA] = { | |
226 | .name = "RSA", | |
227 | .fifo_size = 2048, | |
228 | .tx_loadsz = 2048, | |
229 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11, | |
230 | .flags = UART_CAP_FIFO, | |
231 | }, | |
232 | [PORT_NS16550A] = { | |
233 | .name = "NS16550A", | |
234 | .fifo_size = 16, | |
235 | .tx_loadsz = 16, | |
236 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
237 | .flags = UART_CAP_FIFO | UART_NATSEMI, | |
238 | }, | |
239 | [PORT_XSCALE] = { | |
240 | .name = "XScale", | |
241 | .fifo_size = 32, | |
242 | .tx_loadsz = 32, | |
243 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
4539c24f | 244 | .flags = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE, |
1da177e4 | 245 | }, |
6b06f191 DD |
246 | [PORT_OCTEON] = { |
247 | .name = "OCTEON", | |
248 | .fifo_size = 64, | |
249 | .tx_loadsz = 64, | |
250 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
bd71c182 TK |
251 | .flags = UART_CAP_FIFO, |
252 | }, | |
08e0992f FF |
253 | [PORT_AR7] = { |
254 | .name = "AR7", | |
255 | .fifo_size = 16, | |
256 | .tx_loadsz = 16, | |
257 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00, | |
258 | .flags = UART_CAP_FIFO | UART_CAP_AFE, | |
259 | }, | |
235dae5d PL |
260 | [PORT_U6_16550A] = { |
261 | .name = "U6_16550A", | |
262 | .fifo_size = 64, | |
263 | .tx_loadsz = 64, | |
264 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
265 | .flags = UART_CAP_FIFO | UART_CAP_AFE, | |
266 | }, | |
4539c24f SW |
267 | [PORT_TEGRA] = { |
268 | .name = "Tegra", | |
269 | .fifo_size = 32, | |
270 | .tx_loadsz = 8, | |
271 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | | |
272 | UART_FCR_T_TRIG_01, | |
aef9a7bd | 273 | .rxtrig_bytes = {1, 4, 8, 14}, |
4539c24f SW |
274 | .flags = UART_CAP_FIFO | UART_CAP_RTOIE, |
275 | }, | |
06315348 SH |
276 | [PORT_XR17D15X] = { |
277 | .name = "XR17D15X", | |
278 | .fifo_size = 64, | |
279 | .tx_loadsz = 64, | |
280 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
81db0772 MS |
281 | .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | |
282 | UART_CAP_SLEEP, | |
06315348 | 283 | }, |
dc96efb7 MS |
284 | [PORT_XR17V35X] = { |
285 | .name = "XR17V35X", | |
286 | .fifo_size = 256, | |
287 | .tx_loadsz = 256, | |
288 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11 | | |
289 | UART_FCR_T_TRIG_11, | |
290 | .flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR | | |
291 | UART_CAP_SLEEP, | |
292 | }, | |
7a514596 RS |
293 | [PORT_LPC3220] = { |
294 | .name = "LPC3220", | |
295 | .fifo_size = 64, | |
296 | .tx_loadsz = 32, | |
297 | .fcr = UART_FCR_DMA_SELECT | UART_FCR_ENABLE_FIFO | | |
298 | UART_FCR_R_TRIG_00 | UART_FCR_T_TRIG_00, | |
299 | .flags = UART_CAP_FIFO, | |
300 | }, | |
ebebd49a SH |
301 | [PORT_BRCM_TRUMANAGE] = { |
302 | .name = "TruManage", | |
303 | .fifo_size = 1, | |
304 | .tx_loadsz = 1024, | |
305 | .flags = UART_CAP_HFIFO, | |
306 | }, | |
65ecc9c0 SY |
307 | [PORT_8250_CIR] = { |
308 | .name = "CIR port" | |
e06c93ca LFT |
309 | }, |
310 | [PORT_ALTR_16550_F32] = { | |
311 | .name = "Altera 16550 FIFO32", | |
312 | .fifo_size = 32, | |
313 | .tx_loadsz = 32, | |
314 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
315 | .flags = UART_CAP_FIFO | UART_CAP_AFE, | |
316 | }, | |
317 | [PORT_ALTR_16550_F64] = { | |
318 | .name = "Altera 16550 FIFO64", | |
319 | .fifo_size = 64, | |
320 | .tx_loadsz = 64, | |
321 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
322 | .flags = UART_CAP_FIFO | UART_CAP_AFE, | |
323 | }, | |
324 | [PORT_ALTR_16550_F128] = { | |
325 | .name = "Altera 16550 FIFO128", | |
326 | .fifo_size = 128, | |
327 | .tx_loadsz = 128, | |
328 | .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, | |
329 | .flags = UART_CAP_FIFO | UART_CAP_AFE, | |
330 | }, | |
1da177e4 LT |
331 | }; |
332 | ||
cc419fa0 | 333 | /* Uart divisor latch read */ |
e8155629 | 334 | static int default_serial_dl_read(struct uart_8250_port *up) |
cc419fa0 MD |
335 | { |
336 | return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8; | |
337 | } | |
338 | ||
339 | /* Uart divisor latch write */ | |
e8155629 | 340 | static void default_serial_dl_write(struct uart_8250_port *up, int value) |
cc419fa0 MD |
341 | { |
342 | serial_out(up, UART_DLL, value & 0xff); | |
343 | serial_out(up, UART_DLM, value >> 8 & 0xff); | |
344 | } | |
345 | ||
c420811f | 346 | #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) |
21c614a7 | 347 | |
c420811f | 348 | /* Au1x00/RT288x UART hardware has a weird register layout */ |
21c614a7 PA |
349 | static const u8 au_io_in_map[] = { |
350 | [UART_RX] = 0, | |
351 | [UART_IER] = 2, | |
352 | [UART_IIR] = 3, | |
353 | [UART_LCR] = 5, | |
354 | [UART_MCR] = 6, | |
355 | [UART_LSR] = 7, | |
356 | [UART_MSR] = 8, | |
357 | }; | |
358 | ||
359 | static const u8 au_io_out_map[] = { | |
360 | [UART_TX] = 1, | |
361 | [UART_IER] = 2, | |
362 | [UART_FCR] = 4, | |
363 | [UART_LCR] = 5, | |
364 | [UART_MCR] = 6, | |
365 | }; | |
366 | ||
6b416031 | 367 | static unsigned int au_serial_in(struct uart_port *p, int offset) |
21c614a7 | 368 | { |
6b416031 MD |
369 | offset = au_io_in_map[offset] << p->regshift; |
370 | return __raw_readl(p->membase + offset); | |
21c614a7 PA |
371 | } |
372 | ||
6b416031 | 373 | static void au_serial_out(struct uart_port *p, int offset, int value) |
21c614a7 | 374 | { |
6b416031 MD |
375 | offset = au_io_out_map[offset] << p->regshift; |
376 | __raw_writel(value, p->membase + offset); | |
377 | } | |
378 | ||
379 | /* Au1x00 haven't got a standard divisor latch */ | |
380 | static int au_serial_dl_read(struct uart_8250_port *up) | |
381 | { | |
382 | return __raw_readl(up->port.membase + 0x28); | |
383 | } | |
384 | ||
385 | static void au_serial_dl_write(struct uart_8250_port *up, int value) | |
386 | { | |
387 | __raw_writel(value, up->port.membase + 0x28); | |
21c614a7 PA |
388 | } |
389 | ||
6b416031 MD |
390 | #endif |
391 | ||
7d6a07d1 | 392 | static unsigned int hub6_serial_in(struct uart_port *p, int offset) |
1da177e4 | 393 | { |
e8155629 | 394 | offset = offset << p->regshift; |
7d6a07d1 DD |
395 | outb(p->hub6 - 1 + offset, p->iobase); |
396 | return inb(p->iobase + 1); | |
397 | } | |
1da177e4 | 398 | |
7d6a07d1 DD |
399 | static void hub6_serial_out(struct uart_port *p, int offset, int value) |
400 | { | |
e8155629 | 401 | offset = offset << p->regshift; |
7d6a07d1 DD |
402 | outb(p->hub6 - 1 + offset, p->iobase); |
403 | outb(value, p->iobase + 1); | |
404 | } | |
1da177e4 | 405 | |
7d6a07d1 DD |
406 | static unsigned int mem_serial_in(struct uart_port *p, int offset) |
407 | { | |
e8155629 | 408 | offset = offset << p->regshift; |
7d6a07d1 DD |
409 | return readb(p->membase + offset); |
410 | } | |
1da177e4 | 411 | |
7d6a07d1 DD |
412 | static void mem_serial_out(struct uart_port *p, int offset, int value) |
413 | { | |
e8155629 | 414 | offset = offset << p->regshift; |
7d6a07d1 DD |
415 | writeb(value, p->membase + offset); |
416 | } | |
417 | ||
418 | static void mem32_serial_out(struct uart_port *p, int offset, int value) | |
419 | { | |
e8155629 | 420 | offset = offset << p->regshift; |
7d6a07d1 DD |
421 | writel(value, p->membase + offset); |
422 | } | |
423 | ||
424 | static unsigned int mem32_serial_in(struct uart_port *p, int offset) | |
425 | { | |
e8155629 | 426 | offset = offset << p->regshift; |
7d6a07d1 DD |
427 | return readl(p->membase + offset); |
428 | } | |
1da177e4 | 429 | |
7d6a07d1 DD |
430 | static unsigned int io_serial_in(struct uart_port *p, int offset) |
431 | { | |
e8155629 | 432 | offset = offset << p->regshift; |
7d6a07d1 DD |
433 | return inb(p->iobase + offset); |
434 | } | |
435 | ||
436 | static void io_serial_out(struct uart_port *p, int offset, int value) | |
437 | { | |
e8155629 | 438 | offset = offset << p->regshift; |
7d6a07d1 DD |
439 | outb(value, p->iobase + offset); |
440 | } | |
441 | ||
583d28e9 | 442 | static int serial8250_default_handle_irq(struct uart_port *port); |
dc96efb7 | 443 | static int exar_handle_irq(struct uart_port *port); |
583d28e9 | 444 | |
7d6a07d1 DD |
445 | static void set_io_from_upio(struct uart_port *p) |
446 | { | |
b1261c86 | 447 | struct uart_8250_port *up = up_to_u8250p(p); |
cc419fa0 | 448 | |
e8155629 MD |
449 | up->dl_read = default_serial_dl_read; |
450 | up->dl_write = default_serial_dl_write; | |
cc419fa0 | 451 | |
7d6a07d1 | 452 | switch (p->iotype) { |
1da177e4 | 453 | case UPIO_HUB6: |
7d6a07d1 DD |
454 | p->serial_in = hub6_serial_in; |
455 | p->serial_out = hub6_serial_out; | |
1da177e4 LT |
456 | break; |
457 | ||
458 | case UPIO_MEM: | |
7d6a07d1 DD |
459 | p->serial_in = mem_serial_in; |
460 | p->serial_out = mem_serial_out; | |
1da177e4 LT |
461 | break; |
462 | ||
463 | case UPIO_MEM32: | |
7d6a07d1 DD |
464 | p->serial_in = mem32_serial_in; |
465 | p->serial_out = mem32_serial_out; | |
1da177e4 LT |
466 | break; |
467 | ||
c420811f | 468 | #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) |
21c614a7 | 469 | case UPIO_AU: |
7d6a07d1 DD |
470 | p->serial_in = au_serial_in; |
471 | p->serial_out = au_serial_out; | |
6b416031 MD |
472 | up->dl_read = au_serial_dl_read; |
473 | up->dl_write = au_serial_dl_write; | |
21c614a7 | 474 | break; |
6b416031 | 475 | #endif |
12bf3f24 | 476 | |
1da177e4 | 477 | default: |
7d6a07d1 DD |
478 | p->serial_in = io_serial_in; |
479 | p->serial_out = io_serial_out; | |
480 | break; | |
1da177e4 | 481 | } |
b8e7e40a AC |
482 | /* Remember loaded iotype */ |
483 | up->cur_iotype = p->iotype; | |
583d28e9 | 484 | p->handle_irq = serial8250_default_handle_irq; |
1da177e4 LT |
485 | } |
486 | ||
40b36daa | 487 | static void |
55e4016d | 488 | serial_port_out_sync(struct uart_port *p, int offset, int value) |
40b36daa | 489 | { |
7d6a07d1 | 490 | switch (p->iotype) { |
40b36daa AW |
491 | case UPIO_MEM: |
492 | case UPIO_MEM32: | |
40b36daa | 493 | case UPIO_AU: |
7d6a07d1 DD |
494 | p->serial_out(p, offset, value); |
495 | p->serial_in(p, UART_LCR); /* safe, no side-effects */ | |
40b36daa AW |
496 | break; |
497 | default: | |
7d6a07d1 | 498 | p->serial_out(p, offset, value); |
40b36daa AW |
499 | } |
500 | } | |
501 | ||
1da177e4 LT |
502 | /* |
503 | * For the 16C950 | |
504 | */ | |
505 | static void serial_icr_write(struct uart_8250_port *up, int offset, int value) | |
506 | { | |
507 | serial_out(up, UART_SCR, offset); | |
508 | serial_out(up, UART_ICR, value); | |
509 | } | |
510 | ||
511 | static unsigned int serial_icr_read(struct uart_8250_port *up, int offset) | |
512 | { | |
513 | unsigned int value; | |
514 | ||
515 | serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD); | |
516 | serial_out(up, UART_SCR, offset); | |
517 | value = serial_in(up, UART_ICR); | |
518 | serial_icr_write(up, UART_ACR, up->acr); | |
519 | ||
520 | return value; | |
521 | } | |
522 | ||
523 | /* | |
524 | * FIFO support. | |
525 | */ | |
b5d674ab | 526 | static void serial8250_clear_fifos(struct uart_8250_port *p) |
1da177e4 LT |
527 | { |
528 | if (p->capabilities & UART_CAP_FIFO) { | |
0acf519f PG |
529 | serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO); |
530 | serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1da177e4 | 531 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
0acf519f | 532 | serial_out(p, UART_FCR, 0); |
1da177e4 LT |
533 | } |
534 | } | |
535 | ||
0ad372b9 SM |
536 | void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p) |
537 | { | |
0ad372b9 | 538 | serial8250_clear_fifos(p); |
aef9a7bd | 539 | serial_out(p, UART_FCR, p->fcr); |
0ad372b9 SM |
540 | } |
541 | EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos); | |
542 | ||
1da177e4 LT |
543 | /* |
544 | * IER sleep support. UARTs which have EFRs need the "extended | |
545 | * capability" bit enabled. Note that on XR16C850s, we need to | |
546 | * reset LCR to write to IER. | |
547 | */ | |
b5d674ab | 548 | static void serial8250_set_sleep(struct uart_8250_port *p, int sleep) |
1da177e4 | 549 | { |
dc96efb7 MS |
550 | /* |
551 | * Exar UARTs have a SLEEP register that enables or disables | |
552 | * each UART to enter sleep mode separately. On the XR17V35x the | |
553 | * register is accessible to each UART at the UART_EXAR_SLEEP | |
554 | * offset but the UART channel may only write to the corresponding | |
555 | * bit. | |
556 | */ | |
81db0772 MS |
557 | if ((p->port.type == PORT_XR17V35X) || |
558 | (p->port.type == PORT_XR17D15X)) { | |
b790f210 | 559 | serial_out(p, UART_EXAR_SLEEP, sleep ? 0xff : 0); |
dc96efb7 MS |
560 | return; |
561 | } | |
562 | ||
1da177e4 LT |
563 | if (p->capabilities & UART_CAP_SLEEP) { |
564 | if (p->capabilities & UART_CAP_EFR) { | |
0acf519f PG |
565 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); |
566 | serial_out(p, UART_EFR, UART_EFR_ECB); | |
567 | serial_out(p, UART_LCR, 0); | |
1da177e4 | 568 | } |
0acf519f | 569 | serial_out(p, UART_IER, sleep ? UART_IERX_SLEEP : 0); |
1da177e4 | 570 | if (p->capabilities & UART_CAP_EFR) { |
0acf519f PG |
571 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_B); |
572 | serial_out(p, UART_EFR, 0); | |
573 | serial_out(p, UART_LCR, 0); | |
1da177e4 LT |
574 | } |
575 | } | |
576 | } | |
577 | ||
578 | #ifdef CONFIG_SERIAL_8250_RSA | |
579 | /* | |
580 | * Attempts to turn on the RSA FIFO. Returns zero on failure. | |
581 | * We set the port uart clock rate if we succeed. | |
582 | */ | |
583 | static int __enable_rsa(struct uart_8250_port *up) | |
584 | { | |
585 | unsigned char mode; | |
586 | int result; | |
587 | ||
0acf519f | 588 | mode = serial_in(up, UART_RSA_MSR); |
1da177e4 LT |
589 | result = mode & UART_RSA_MSR_FIFO; |
590 | ||
591 | if (!result) { | |
0acf519f PG |
592 | serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO); |
593 | mode = serial_in(up, UART_RSA_MSR); | |
1da177e4 LT |
594 | result = mode & UART_RSA_MSR_FIFO; |
595 | } | |
596 | ||
597 | if (result) | |
598 | up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16; | |
599 | ||
600 | return result; | |
601 | } | |
602 | ||
603 | static void enable_rsa(struct uart_8250_port *up) | |
604 | { | |
605 | if (up->port.type == PORT_RSA) { | |
606 | if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) { | |
607 | spin_lock_irq(&up->port.lock); | |
608 | __enable_rsa(up); | |
609 | spin_unlock_irq(&up->port.lock); | |
610 | } | |
611 | if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) | |
0acf519f | 612 | serial_out(up, UART_RSA_FRR, 0); |
1da177e4 LT |
613 | } |
614 | } | |
615 | ||
616 | /* | |
617 | * Attempts to turn off the RSA FIFO. Returns zero on failure. | |
618 | * It is unknown why interrupts were disabled in here. However, | |
619 | * the caller is expected to preserve this behaviour by grabbing | |
620 | * the spinlock before calling this function. | |
621 | */ | |
622 | static void disable_rsa(struct uart_8250_port *up) | |
623 | { | |
624 | unsigned char mode; | |
625 | int result; | |
626 | ||
627 | if (up->port.type == PORT_RSA && | |
628 | up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) { | |
629 | spin_lock_irq(&up->port.lock); | |
630 | ||
0acf519f | 631 | mode = serial_in(up, UART_RSA_MSR); |
1da177e4 LT |
632 | result = !(mode & UART_RSA_MSR_FIFO); |
633 | ||
634 | if (!result) { | |
0acf519f PG |
635 | serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO); |
636 | mode = serial_in(up, UART_RSA_MSR); | |
1da177e4 LT |
637 | result = !(mode & UART_RSA_MSR_FIFO); |
638 | } | |
639 | ||
640 | if (result) | |
641 | up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16; | |
642 | spin_unlock_irq(&up->port.lock); | |
643 | } | |
644 | } | |
645 | #endif /* CONFIG_SERIAL_8250_RSA */ | |
646 | ||
647 | /* | |
648 | * This is a quickie test to see how big the FIFO is. | |
649 | * It doesn't work at all the time, more's the pity. | |
650 | */ | |
651 | static int size_fifo(struct uart_8250_port *up) | |
652 | { | |
b32b19b8 JAH |
653 | unsigned char old_fcr, old_mcr, old_lcr; |
654 | unsigned short old_dl; | |
1da177e4 LT |
655 | int count; |
656 | ||
0acf519f PG |
657 | old_lcr = serial_in(up, UART_LCR); |
658 | serial_out(up, UART_LCR, 0); | |
659 | old_fcr = serial_in(up, UART_FCR); | |
660 | old_mcr = serial_in(up, UART_MCR); | |
661 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1da177e4 | 662 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
0acf519f PG |
663 | serial_out(up, UART_MCR, UART_MCR_LOOP); |
664 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); | |
b32b19b8 JAH |
665 | old_dl = serial_dl_read(up); |
666 | serial_dl_write(up, 0x0001); | |
0acf519f | 667 | serial_out(up, UART_LCR, 0x03); |
1da177e4 | 668 | for (count = 0; count < 256; count++) |
0acf519f | 669 | serial_out(up, UART_TX, count); |
1da177e4 | 670 | mdelay(20);/* FIXME - schedule_timeout */ |
0acf519f | 671 | for (count = 0; (serial_in(up, UART_LSR) & UART_LSR_DR) && |
1da177e4 | 672 | (count < 256); count++) |
0acf519f PG |
673 | serial_in(up, UART_RX); |
674 | serial_out(up, UART_FCR, old_fcr); | |
675 | serial_out(up, UART_MCR, old_mcr); | |
676 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); | |
b32b19b8 | 677 | serial_dl_write(up, old_dl); |
0acf519f | 678 | serial_out(up, UART_LCR, old_lcr); |
1da177e4 LT |
679 | |
680 | return count; | |
681 | } | |
682 | ||
683 | /* | |
684 | * Read UART ID using the divisor method - set DLL and DLM to zero | |
685 | * and the revision will be in DLL and device type in DLM. We | |
686 | * preserve the device state across this. | |
687 | */ | |
688 | static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) | |
689 | { | |
690 | unsigned char old_dll, old_dlm, old_lcr; | |
691 | unsigned int id; | |
692 | ||
0acf519f PG |
693 | old_lcr = serial_in(p, UART_LCR); |
694 | serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A); | |
1da177e4 | 695 | |
0acf519f PG |
696 | old_dll = serial_in(p, UART_DLL); |
697 | old_dlm = serial_in(p, UART_DLM); | |
1da177e4 | 698 | |
0acf519f PG |
699 | serial_out(p, UART_DLL, 0); |
700 | serial_out(p, UART_DLM, 0); | |
1da177e4 | 701 | |
0acf519f | 702 | id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8; |
1da177e4 | 703 | |
0acf519f PG |
704 | serial_out(p, UART_DLL, old_dll); |
705 | serial_out(p, UART_DLM, old_dlm); | |
706 | serial_out(p, UART_LCR, old_lcr); | |
1da177e4 LT |
707 | |
708 | return id; | |
709 | } | |
710 | ||
711 | /* | |
712 | * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's. | |
713 | * When this function is called we know it is at least a StarTech | |
714 | * 16650 V2, but it might be one of several StarTech UARTs, or one of | |
715 | * its clones. (We treat the broken original StarTech 16650 V1 as a | |
716 | * 16550, and why not? Startech doesn't seem to even acknowledge its | |
717 | * existence.) | |
bd71c182 | 718 | * |
1da177e4 LT |
719 | * What evil have men's minds wrought... |
720 | */ | |
721 | static void autoconfig_has_efr(struct uart_8250_port *up) | |
722 | { | |
723 | unsigned int id1, id2, id3, rev; | |
724 | ||
725 | /* | |
726 | * Everything with an EFR has SLEEP | |
727 | */ | |
728 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; | |
729 | ||
730 | /* | |
731 | * First we check to see if it's an Oxford Semiconductor UART. | |
732 | * | |
733 | * If we have to do this here because some non-National | |
734 | * Semiconductor clone chips lock up if you try writing to the | |
735 | * LSR register (which serial_icr_read does) | |
736 | */ | |
737 | ||
738 | /* | |
739 | * Check for Oxford Semiconductor 16C950. | |
740 | * | |
741 | * EFR [4] must be set else this test fails. | |
742 | * | |
743 | * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca) | |
744 | * claims that it's needed for 952 dual UART's (which are not | |
745 | * recommended for new designs). | |
746 | */ | |
747 | up->acr = 0; | |
662b083a | 748 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1da177e4 LT |
749 | serial_out(up, UART_EFR, UART_EFR_ECB); |
750 | serial_out(up, UART_LCR, 0x00); | |
751 | id1 = serial_icr_read(up, UART_ID1); | |
752 | id2 = serial_icr_read(up, UART_ID2); | |
753 | id3 = serial_icr_read(up, UART_ID3); | |
754 | rev = serial_icr_read(up, UART_REV); | |
755 | ||
756 | DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev); | |
757 | ||
758 | if (id1 == 0x16 && id2 == 0xC9 && | |
759 | (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) { | |
760 | up->port.type = PORT_16C950; | |
4ba5e35d RK |
761 | |
762 | /* | |
763 | * Enable work around for the Oxford Semiconductor 952 rev B | |
764 | * chip which causes it to seriously miscalculate baud rates | |
765 | * when DLL is 0. | |
766 | */ | |
767 | if (id3 == 0x52 && rev == 0x01) | |
768 | up->bugs |= UART_BUG_QUOT; | |
1da177e4 LT |
769 | return; |
770 | } | |
bd71c182 | 771 | |
1da177e4 LT |
772 | /* |
773 | * We check for a XR16C850 by setting DLL and DLM to 0, and then | |
774 | * reading back DLL and DLM. The chip type depends on the DLM | |
775 | * value read back: | |
776 | * 0x10 - XR16C850 and the DLL contains the chip revision. | |
777 | * 0x12 - XR16C2850. | |
778 | * 0x14 - XR16C854. | |
779 | */ | |
780 | id1 = autoconfig_read_divisor_id(up); | |
781 | DEBUG_AUTOCONF("850id=%04x ", id1); | |
782 | ||
783 | id2 = id1 >> 8; | |
784 | if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) { | |
1da177e4 LT |
785 | up->port.type = PORT_16850; |
786 | return; | |
787 | } | |
788 | ||
789 | /* | |
790 | * It wasn't an XR16C850. | |
791 | * | |
792 | * We distinguish between the '654 and the '650 by counting | |
793 | * how many bytes are in the FIFO. I'm using this for now, | |
794 | * since that's the technique that was sent to me in the | |
795 | * serial driver update, but I'm not convinced this works. | |
796 | * I've had problems doing this in the past. -TYT | |
797 | */ | |
798 | if (size_fifo(up) == 64) | |
799 | up->port.type = PORT_16654; | |
800 | else | |
801 | up->port.type = PORT_16650V2; | |
802 | } | |
803 | ||
804 | /* | |
805 | * We detected a chip without a FIFO. Only two fall into | |
806 | * this category - the original 8250 and the 16450. The | |
807 | * 16450 has a scratch register (accessible with LCR=0) | |
808 | */ | |
809 | static void autoconfig_8250(struct uart_8250_port *up) | |
810 | { | |
811 | unsigned char scratch, status1, status2; | |
812 | ||
813 | up->port.type = PORT_8250; | |
814 | ||
815 | scratch = serial_in(up, UART_SCR); | |
0acf519f | 816 | serial_out(up, UART_SCR, 0xa5); |
1da177e4 | 817 | status1 = serial_in(up, UART_SCR); |
0acf519f | 818 | serial_out(up, UART_SCR, 0x5a); |
1da177e4 | 819 | status2 = serial_in(up, UART_SCR); |
0acf519f | 820 | serial_out(up, UART_SCR, scratch); |
1da177e4 LT |
821 | |
822 | if (status1 == 0xa5 && status2 == 0x5a) | |
823 | up->port.type = PORT_16450; | |
824 | } | |
825 | ||
826 | static int broken_efr(struct uart_8250_port *up) | |
827 | { | |
828 | /* | |
829 | * Exar ST16C2550 "A2" devices incorrectly detect as | |
830 | * having an EFR, and report an ID of 0x0201. See | |
631dd1a8 | 831 | * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html |
1da177e4 LT |
832 | */ |
833 | if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16) | |
834 | return 1; | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
0d0389e5 YK |
839 | static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) |
840 | { | |
841 | unsigned char status; | |
842 | ||
843 | status = serial_in(up, 0x04); /* EXCR2 */ | |
844 | #define PRESL(x) ((x) & 0x30) | |
845 | if (PRESL(status) == 0x10) { | |
846 | /* already in high speed mode */ | |
847 | return 0; | |
848 | } else { | |
849 | status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ | |
850 | status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ | |
0acf519f | 851 | serial_out(up, 0x04, status); |
0d0389e5 YK |
852 | } |
853 | return 1; | |
854 | } | |
855 | ||
1da177e4 LT |
856 | /* |
857 | * We know that the chip has FIFOs. Does it have an EFR? The | |
858 | * EFR is located in the same register position as the IIR and | |
859 | * we know the top two bits of the IIR are currently set. The | |
860 | * EFR should contain zero. Try to read the EFR. | |
861 | */ | |
862 | static void autoconfig_16550a(struct uart_8250_port *up) | |
863 | { | |
864 | unsigned char status1, status2; | |
865 | unsigned int iersave; | |
866 | ||
867 | up->port.type = PORT_16550A; | |
868 | up->capabilities |= UART_CAP_FIFO; | |
869 | ||
dc96efb7 MS |
870 | /* |
871 | * XR17V35x UARTs have an extra divisor register, DLD | |
872 | * that gets enabled with when DLAB is set which will | |
873 | * cause the device to incorrectly match and assign | |
874 | * port type to PORT_16650. The EFR for this UART is | |
875 | * found at offset 0x09. Instead check the Deice ID (DVID) | |
876 | * register for a 2, 4 or 8 port UART. | |
877 | */ | |
b7a7e14f MS |
878 | if (up->port.flags & UPF_EXAR_EFR) { |
879 | status1 = serial_in(up, UART_EXAR_DVID); | |
880 | if (status1 == 0x82 || status1 == 0x84 || status1 == 0x88) { | |
dc96efb7 MS |
881 | DEBUG_AUTOCONF("Exar XR17V35x "); |
882 | up->port.type = PORT_XR17V35X; | |
883 | up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | | |
884 | UART_CAP_SLEEP; | |
885 | ||
886 | return; | |
887 | } | |
888 | ||
889 | } | |
890 | ||
1da177e4 LT |
891 | /* |
892 | * Check for presence of the EFR when DLAB is set. | |
893 | * Only ST16C650V1 UARTs pass this test. | |
894 | */ | |
0acf519f | 895 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); |
1da177e4 | 896 | if (serial_in(up, UART_EFR) == 0) { |
0acf519f | 897 | serial_out(up, UART_EFR, 0xA8); |
1da177e4 LT |
898 | if (serial_in(up, UART_EFR) != 0) { |
899 | DEBUG_AUTOCONF("EFRv1 "); | |
900 | up->port.type = PORT_16650; | |
901 | up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP; | |
902 | } else { | |
903 | DEBUG_AUTOCONF("Motorola 8xxx DUART "); | |
904 | } | |
0acf519f | 905 | serial_out(up, UART_EFR, 0); |
1da177e4 LT |
906 | return; |
907 | } | |
908 | ||
909 | /* | |
910 | * Maybe it requires 0xbf to be written to the LCR. | |
911 | * (other ST16C650V2 UARTs, TI16C752A, etc) | |
912 | */ | |
0acf519f | 913 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1da177e4 LT |
914 | if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) { |
915 | DEBUG_AUTOCONF("EFRv2 "); | |
916 | autoconfig_has_efr(up); | |
917 | return; | |
918 | } | |
919 | ||
920 | /* | |
921 | * Check for a National Semiconductor SuperIO chip. | |
922 | * Attempt to switch to bank 2, read the value of the LOOP bit | |
923 | * from EXCR1. Switch back to bank 0, change it in MCR. Then | |
924 | * switch back to bank 2, read it from EXCR1 again and check | |
925 | * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2 | |
1da177e4 | 926 | */ |
0acf519f | 927 | serial_out(up, UART_LCR, 0); |
1da177e4 | 928 | status1 = serial_in(up, UART_MCR); |
0acf519f | 929 | serial_out(up, UART_LCR, 0xE0); |
1da177e4 LT |
930 | status2 = serial_in(up, 0x02); /* EXCR1 */ |
931 | ||
932 | if (!((status2 ^ status1) & UART_MCR_LOOP)) { | |
0acf519f PG |
933 | serial_out(up, UART_LCR, 0); |
934 | serial_out(up, UART_MCR, status1 ^ UART_MCR_LOOP); | |
935 | serial_out(up, UART_LCR, 0xE0); | |
1da177e4 | 936 | status2 = serial_in(up, 0x02); /* EXCR1 */ |
0acf519f PG |
937 | serial_out(up, UART_LCR, 0); |
938 | serial_out(up, UART_MCR, status1); | |
1da177e4 LT |
939 | |
940 | if ((status2 ^ status1) & UART_MCR_LOOP) { | |
857dde2e DW |
941 | unsigned short quot; |
942 | ||
0acf519f | 943 | serial_out(up, UART_LCR, 0xE0); |
857dde2e | 944 | |
b32b19b8 | 945 | quot = serial_dl_read(up); |
857dde2e DW |
946 | quot <<= 3; |
947 | ||
0d0389e5 YK |
948 | if (ns16550a_goto_highspeed(up)) |
949 | serial_dl_write(up, quot); | |
857dde2e | 950 | |
0acf519f | 951 | serial_out(up, UART_LCR, 0); |
1da177e4 | 952 | |
857dde2e | 953 | up->port.uartclk = 921600*16; |
1da177e4 LT |
954 | up->port.type = PORT_NS16550A; |
955 | up->capabilities |= UART_NATSEMI; | |
956 | return; | |
957 | } | |
958 | } | |
959 | ||
960 | /* | |
961 | * No EFR. Try to detect a TI16750, which only sets bit 5 of | |
962 | * the IIR when 64 byte FIFO mode is enabled when DLAB is set. | |
963 | * Try setting it with and without DLAB set. Cheap clones | |
964 | * set bit 5 without DLAB set. | |
965 | */ | |
0acf519f PG |
966 | serial_out(up, UART_LCR, 0); |
967 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); | |
1da177e4 | 968 | status1 = serial_in(up, UART_IIR) >> 5; |
0acf519f PG |
969 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
970 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); | |
971 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); | |
1da177e4 | 972 | status2 = serial_in(up, UART_IIR) >> 5; |
0acf519f PG |
973 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
974 | serial_out(up, UART_LCR, 0); | |
1da177e4 LT |
975 | |
976 | DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2); | |
977 | ||
978 | if (status1 == 6 && status2 == 7) { | |
979 | up->port.type = PORT_16750; | |
980 | up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP; | |
981 | return; | |
982 | } | |
983 | ||
984 | /* | |
985 | * Try writing and reading the UART_IER_UUE bit (b6). | |
986 | * If it works, this is probably one of the Xscale platform's | |
987 | * internal UARTs. | |
988 | * We're going to explicitly set the UUE bit to 0 before | |
989 | * trying to write and read a 1 just to make sure it's not | |
990 | * already a 1 and maybe locked there before we even start start. | |
991 | */ | |
992 | iersave = serial_in(up, UART_IER); | |
0acf519f | 993 | serial_out(up, UART_IER, iersave & ~UART_IER_UUE); |
1da177e4 LT |
994 | if (!(serial_in(up, UART_IER) & UART_IER_UUE)) { |
995 | /* | |
996 | * OK it's in a known zero state, try writing and reading | |
997 | * without disturbing the current state of the other bits. | |
998 | */ | |
0acf519f | 999 | serial_out(up, UART_IER, iersave | UART_IER_UUE); |
1da177e4 LT |
1000 | if (serial_in(up, UART_IER) & UART_IER_UUE) { |
1001 | /* | |
1002 | * It's an Xscale. | |
1003 | * We'll leave the UART_IER_UUE bit set to 1 (enabled). | |
1004 | */ | |
1005 | DEBUG_AUTOCONF("Xscale "); | |
1006 | up->port.type = PORT_XSCALE; | |
5568181f | 1007 | up->capabilities |= UART_CAP_UUE | UART_CAP_RTOIE; |
1da177e4 LT |
1008 | return; |
1009 | } | |
1010 | } else { | |
1011 | /* | |
1012 | * If we got here we couldn't force the IER_UUE bit to 0. | |
1013 | * Log it and continue. | |
1014 | */ | |
1015 | DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 "); | |
1016 | } | |
0acf519f | 1017 | serial_out(up, UART_IER, iersave); |
235dae5d | 1018 | |
06315348 SH |
1019 | /* |
1020 | * Exar uarts have EFR in a weird location | |
1021 | */ | |
1022 | if (up->port.flags & UPF_EXAR_EFR) { | |
81db0772 | 1023 | DEBUG_AUTOCONF("Exar XR17D15x "); |
06315348 | 1024 | up->port.type = PORT_XR17D15X; |
81db0772 MS |
1025 | up->capabilities |= UART_CAP_AFE | UART_CAP_EFR | |
1026 | UART_CAP_SLEEP; | |
1027 | ||
1028 | return; | |
06315348 SH |
1029 | } |
1030 | ||
235dae5d PL |
1031 | /* |
1032 | * We distinguish between 16550A and U6 16550A by counting | |
1033 | * how many bytes are in the FIFO. | |
1034 | */ | |
1035 | if (up->port.type == PORT_16550A && size_fifo(up) == 64) { | |
1036 | up->port.type = PORT_U6_16550A; | |
1037 | up->capabilities |= UART_CAP_AFE; | |
1038 | } | |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | /* | |
1042 | * This routine is called by rs_init() to initialize a specific serial | |
1043 | * port. It determines what type of UART chip this serial port is | |
1044 | * using: 8250, 16450, 16550, 16550A. The important question is | |
1045 | * whether or not this UART is a 16550A or not, since this will | |
1046 | * determine whether or not we can use its FIFO features or not. | |
1047 | */ | |
1048 | static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) | |
1049 | { | |
1050 | unsigned char status1, scratch, scratch2, scratch3; | |
1051 | unsigned char save_lcr, save_mcr; | |
dfe42443 | 1052 | struct uart_port *port = &up->port; |
1da177e4 | 1053 | unsigned long flags; |
bd21f551 | 1054 | unsigned int old_capabilities; |
1da177e4 | 1055 | |
dfe42443 | 1056 | if (!port->iobase && !port->mapbase && !port->membase) |
1da177e4 LT |
1057 | return; |
1058 | ||
80647b95 | 1059 | DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ", |
dfe42443 | 1060 | serial_index(port), port->iobase, port->membase); |
1da177e4 LT |
1061 | |
1062 | /* | |
1063 | * We really do need global IRQs disabled here - we're going to | |
1064 | * be frobbing the chips IRQ enable register to see if it exists. | |
1065 | */ | |
dfe42443 | 1066 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1067 | |
1068 | up->capabilities = 0; | |
4ba5e35d | 1069 | up->bugs = 0; |
1da177e4 | 1070 | |
dfe42443 | 1071 | if (!(port->flags & UPF_BUGGY_UART)) { |
1da177e4 LT |
1072 | /* |
1073 | * Do a simple existence test first; if we fail this, | |
1074 | * there's no point trying anything else. | |
bd71c182 | 1075 | * |
1da177e4 LT |
1076 | * 0x80 is used as a nonsense port to prevent against |
1077 | * false positives due to ISA bus float. The | |
1078 | * assumption is that 0x80 is a non-existent port; | |
1079 | * which should be safe since include/asm/io.h also | |
1080 | * makes this assumption. | |
1081 | * | |
1082 | * Note: this is safe as long as MCR bit 4 is clear | |
1083 | * and the device is in "PC" mode. | |
1084 | */ | |
0acf519f PG |
1085 | scratch = serial_in(up, UART_IER); |
1086 | serial_out(up, UART_IER, 0); | |
1da177e4 LT |
1087 | #ifdef __i386__ |
1088 | outb(0xff, 0x080); | |
1089 | #endif | |
48212008 TH |
1090 | /* |
1091 | * Mask out IER[7:4] bits for test as some UARTs (e.g. TL | |
1092 | * 16C754B) allow only to modify them if an EFR bit is set. | |
1093 | */ | |
0acf519f PG |
1094 | scratch2 = serial_in(up, UART_IER) & 0x0f; |
1095 | serial_out(up, UART_IER, 0x0F); | |
1da177e4 LT |
1096 | #ifdef __i386__ |
1097 | outb(0, 0x080); | |
1098 | #endif | |
0acf519f PG |
1099 | scratch3 = serial_in(up, UART_IER) & 0x0f; |
1100 | serial_out(up, UART_IER, scratch); | |
1da177e4 LT |
1101 | if (scratch2 != 0 || scratch3 != 0x0F) { |
1102 | /* | |
1103 | * We failed; there's nothing here | |
1104 | */ | |
bd21f551 | 1105 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1106 | DEBUG_AUTOCONF("IER test failed (%02x, %02x) ", |
1107 | scratch2, scratch3); | |
1108 | goto out; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | save_mcr = serial_in(up, UART_MCR); | |
1113 | save_lcr = serial_in(up, UART_LCR); | |
1114 | ||
bd71c182 | 1115 | /* |
1da177e4 LT |
1116 | * Check to see if a UART is really there. Certain broken |
1117 | * internal modems based on the Rockwell chipset fail this | |
1118 | * test, because they apparently don't implement the loopback | |
1119 | * test mode. So this test is skipped on the COM 1 through | |
1120 | * COM 4 ports. This *should* be safe, since no board | |
1121 | * manufacturer would be stupid enough to design a board | |
1122 | * that conflicts with COM 1-4 --- we hope! | |
1123 | */ | |
dfe42443 | 1124 | if (!(port->flags & UPF_SKIP_TEST)) { |
0acf519f PG |
1125 | serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A); |
1126 | status1 = serial_in(up, UART_MSR) & 0xF0; | |
1127 | serial_out(up, UART_MCR, save_mcr); | |
1da177e4 | 1128 | if (status1 != 0x90) { |
bd21f551 | 1129 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1130 | DEBUG_AUTOCONF("LOOP test failed (%02x) ", |
1131 | status1); | |
1132 | goto out; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * We're pretty sure there's a port here. Lets find out what | |
1138 | * type of port it is. The IIR top two bits allows us to find | |
6f0d618f | 1139 | * out if it's 8250 or 16450, 16550, 16550A or later. This |
1da177e4 LT |
1140 | * determines what we test for next. |
1141 | * | |
1142 | * We also initialise the EFR (if any) to zero for later. The | |
1143 | * EFR occupies the same register location as the FCR and IIR. | |
1144 | */ | |
0acf519f PG |
1145 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1146 | serial_out(up, UART_EFR, 0); | |
1147 | serial_out(up, UART_LCR, 0); | |
1da177e4 | 1148 | |
0acf519f | 1149 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
1da177e4 LT |
1150 | scratch = serial_in(up, UART_IIR) >> 6; |
1151 | ||
1da177e4 LT |
1152 | switch (scratch) { |
1153 | case 0: | |
1154 | autoconfig_8250(up); | |
1155 | break; | |
1156 | case 1: | |
dfe42443 | 1157 | port->type = PORT_UNKNOWN; |
1da177e4 LT |
1158 | break; |
1159 | case 2: | |
dfe42443 | 1160 | port->type = PORT_16550; |
1da177e4 LT |
1161 | break; |
1162 | case 3: | |
1163 | autoconfig_16550a(up); | |
1164 | break; | |
1165 | } | |
1166 | ||
1167 | #ifdef CONFIG_SERIAL_8250_RSA | |
1168 | /* | |
1169 | * Only probe for RSA ports if we got the region. | |
1170 | */ | |
dfe42443 | 1171 | if (port->type == PORT_16550A && probeflags & PROBE_RSA) { |
1da177e4 LT |
1172 | int i; |
1173 | ||
1174 | for (i = 0 ; i < probe_rsa_count; ++i) { | |
dfe42443 PG |
1175 | if (probe_rsa[i] == port->iobase && __enable_rsa(up)) { |
1176 | port->type = PORT_RSA; | |
1da177e4 LT |
1177 | break; |
1178 | } | |
1179 | } | |
1180 | } | |
1181 | #endif | |
21c614a7 | 1182 | |
0acf519f | 1183 | serial_out(up, UART_LCR, save_lcr); |
1da177e4 | 1184 | |
dfe42443 | 1185 | port->fifosize = uart_config[up->port.type].fifo_size; |
bd21f551 | 1186 | old_capabilities = up->capabilities; |
dfe42443 PG |
1187 | up->capabilities = uart_config[port->type].flags; |
1188 | up->tx_loadsz = uart_config[port->type].tx_loadsz; | |
1da177e4 | 1189 | |
dfe42443 | 1190 | if (port->type == PORT_UNKNOWN) |
bd21f551 | 1191 | goto out_lock; |
1da177e4 LT |
1192 | |
1193 | /* | |
1194 | * Reset the UART. | |
1195 | */ | |
1196 | #ifdef CONFIG_SERIAL_8250_RSA | |
dfe42443 | 1197 | if (port->type == PORT_RSA) |
0acf519f | 1198 | serial_out(up, UART_RSA_FRR, 0); |
1da177e4 | 1199 | #endif |
0acf519f | 1200 | serial_out(up, UART_MCR, save_mcr); |
1da177e4 | 1201 | serial8250_clear_fifos(up); |
40b36daa | 1202 | serial_in(up, UART_RX); |
5c8c755c | 1203 | if (up->capabilities & UART_CAP_UUE) |
0acf519f | 1204 | serial_out(up, UART_IER, UART_IER_UUE); |
5c8c755c | 1205 | else |
0acf519f | 1206 | serial_out(up, UART_IER, 0); |
1da177e4 | 1207 | |
bd21f551 | 1208 | out_lock: |
dfe42443 | 1209 | spin_unlock_irqrestore(&port->lock, flags); |
bd21f551 FL |
1210 | if (up->capabilities != old_capabilities) { |
1211 | printk(KERN_WARNING | |
1212 | "ttyS%d: detected caps %08x should be %08x\n", | |
1213 | serial_index(port), old_capabilities, | |
1214 | up->capabilities); | |
1215 | } | |
1216 | out: | |
1217 | DEBUG_AUTOCONF("iir=%d ", scratch); | |
dfe42443 | 1218 | DEBUG_AUTOCONF("type=%s\n", uart_config[port->type].name); |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | static void autoconfig_irq(struct uart_8250_port *up) | |
1222 | { | |
dfe42443 | 1223 | struct uart_port *port = &up->port; |
1da177e4 LT |
1224 | unsigned char save_mcr, save_ier; |
1225 | unsigned char save_ICP = 0; | |
1226 | unsigned int ICP = 0; | |
1227 | unsigned long irqs; | |
1228 | int irq; | |
1229 | ||
dfe42443 PG |
1230 | if (port->flags & UPF_FOURPORT) { |
1231 | ICP = (port->iobase & 0xfe0) | 0x1f; | |
1da177e4 LT |
1232 | save_ICP = inb_p(ICP); |
1233 | outb_p(0x80, ICP); | |
0d263a26 | 1234 | inb_p(ICP); |
1da177e4 LT |
1235 | } |
1236 | ||
1237 | /* forget possible initially masked and pending IRQ */ | |
1238 | probe_irq_off(probe_irq_on()); | |
0acf519f PG |
1239 | save_mcr = serial_in(up, UART_MCR); |
1240 | save_ier = serial_in(up, UART_IER); | |
1241 | serial_out(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2); | |
bd71c182 | 1242 | |
1da177e4 | 1243 | irqs = probe_irq_on(); |
0acf519f | 1244 | serial_out(up, UART_MCR, 0); |
6f803cd0 | 1245 | udelay(10); |
dfe42443 | 1246 | if (port->flags & UPF_FOURPORT) { |
0acf519f | 1247 | serial_out(up, UART_MCR, |
1da177e4 LT |
1248 | UART_MCR_DTR | UART_MCR_RTS); |
1249 | } else { | |
0acf519f | 1250 | serial_out(up, UART_MCR, |
1da177e4 LT |
1251 | UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2); |
1252 | } | |
0acf519f | 1253 | serial_out(up, UART_IER, 0x0f); /* enable all intrs */ |
0d263a26 PG |
1254 | serial_in(up, UART_LSR); |
1255 | serial_in(up, UART_RX); | |
1256 | serial_in(up, UART_IIR); | |
1257 | serial_in(up, UART_MSR); | |
0acf519f | 1258 | serial_out(up, UART_TX, 0xFF); |
6f803cd0 | 1259 | udelay(20); |
1da177e4 LT |
1260 | irq = probe_irq_off(irqs); |
1261 | ||
0acf519f PG |
1262 | serial_out(up, UART_MCR, save_mcr); |
1263 | serial_out(up, UART_IER, save_ier); | |
1da177e4 | 1264 | |
dfe42443 | 1265 | if (port->flags & UPF_FOURPORT) |
1da177e4 LT |
1266 | outb_p(save_ICP, ICP); |
1267 | ||
dfe42443 | 1268 | port->irq = (irq > 0) ? irq : 0; |
1da177e4 LT |
1269 | } |
1270 | ||
e763b90c RK |
1271 | static inline void __stop_tx(struct uart_8250_port *p) |
1272 | { | |
1273 | if (p->ier & UART_IER_THRI) { | |
1274 | p->ier &= ~UART_IER_THRI; | |
1275 | serial_out(p, UART_IER, p->ier); | |
1276 | } | |
1277 | } | |
1278 | ||
b129a8cc | 1279 | static void serial8250_stop_tx(struct uart_port *port) |
1da177e4 | 1280 | { |
b1261c86 | 1281 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 | 1282 | |
e763b90c | 1283 | __stop_tx(up); |
1da177e4 LT |
1284 | |
1285 | /* | |
e763b90c | 1286 | * We really want to stop the transmitter from sending. |
1da177e4 | 1287 | */ |
dfe42443 | 1288 | if (port->type == PORT_16C950) { |
1da177e4 LT |
1289 | up->acr |= UART_ACR_TXDIS; |
1290 | serial_icr_write(up, UART_ACR, up->acr); | |
1291 | } | |
1292 | } | |
1293 | ||
b129a8cc | 1294 | static void serial8250_start_tx(struct uart_port *port) |
1da177e4 | 1295 | { |
b1261c86 | 1296 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 | 1297 | |
9ee4b83e HK |
1298 | if (up->dma && !serial8250_tx_dma(up)) { |
1299 | return; | |
1300 | } else if (!(up->ier & UART_IER_THRI)) { | |
1da177e4 | 1301 | up->ier |= UART_IER_THRI; |
4fd996a1 | 1302 | serial_port_out(port, UART_IER, up->ier); |
55d3b282 | 1303 | |
67f7654e | 1304 | if (up->bugs & UART_BUG_TXEN) { |
68cb4f8e | 1305 | unsigned char lsr; |
55d3b282 | 1306 | lsr = serial_in(up, UART_LSR); |
ad4c2aa6 | 1307 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; |
a205a56d | 1308 | if (lsr & UART_LSR_TEMT) |
3986fb2b | 1309 | serial8250_tx_chars(up); |
55d3b282 | 1310 | } |
1da177e4 | 1311 | } |
e763b90c | 1312 | |
1da177e4 | 1313 | /* |
e763b90c | 1314 | * Re-enable the transmitter if we disabled it. |
1da177e4 | 1315 | */ |
dfe42443 | 1316 | if (port->type == PORT_16C950 && up->acr & UART_ACR_TXDIS) { |
1da177e4 LT |
1317 | up->acr &= ~UART_ACR_TXDIS; |
1318 | serial_icr_write(up, UART_ACR, up->acr); | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | static void serial8250_stop_rx(struct uart_port *port) | |
1323 | { | |
b1261c86 | 1324 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 LT |
1325 | |
1326 | up->ier &= ~UART_IER_RLSI; | |
1327 | up->port.read_status_mask &= ~UART_LSR_DR; | |
4fd996a1 | 1328 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 LT |
1329 | } |
1330 | ||
1331 | static void serial8250_enable_ms(struct uart_port *port) | |
1332 | { | |
b1261c86 | 1333 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 | 1334 | |
21c614a7 PA |
1335 | /* no MSR capabilities */ |
1336 | if (up->bugs & UART_BUG_NOMSR) | |
1337 | return; | |
1338 | ||
1da177e4 | 1339 | up->ier |= UART_IER_MSI; |
4fd996a1 | 1340 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 LT |
1341 | } |
1342 | ||
0690f41f | 1343 | /* |
3986fb2b | 1344 | * serial8250_rx_chars: processes according to the passed in LSR |
0690f41f PG |
1345 | * value, and returns the remaining LSR bits not handled |
1346 | * by this Rx routine. | |
1347 | */ | |
3986fb2b PG |
1348 | unsigned char |
1349 | serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) | |
1da177e4 | 1350 | { |
dfe42443 | 1351 | struct uart_port *port = &up->port; |
0690f41f | 1352 | unsigned char ch; |
1da177e4 LT |
1353 | int max_count = 256; |
1354 | char flag; | |
1355 | ||
1356 | do { | |
7500b1f6 | 1357 | if (likely(lsr & UART_LSR_DR)) |
0acf519f | 1358 | ch = serial_in(up, UART_RX); |
7500b1f6 AR |
1359 | else |
1360 | /* | |
1361 | * Intel 82571 has a Serial Over Lan device that will | |
1362 | * set UART_LSR_BI without setting UART_LSR_DR when | |
1363 | * it receives a break. To avoid reading from the | |
1364 | * receive buffer without UART_LSR_DR bit set, we | |
1365 | * just force the read character to be 0 | |
1366 | */ | |
1367 | ch = 0; | |
1368 | ||
1da177e4 | 1369 | flag = TTY_NORMAL; |
dfe42443 | 1370 | port->icount.rx++; |
1da177e4 | 1371 | |
ad4c2aa6 CM |
1372 | lsr |= up->lsr_saved_flags; |
1373 | up->lsr_saved_flags = 0; | |
1da177e4 | 1374 | |
ad4c2aa6 | 1375 | if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) { |
1da177e4 LT |
1376 | if (lsr & UART_LSR_BI) { |
1377 | lsr &= ~(UART_LSR_FE | UART_LSR_PE); | |
dfe42443 | 1378 | port->icount.brk++; |
1da177e4 LT |
1379 | /* |
1380 | * We do the SysRQ and SAK checking | |
1381 | * here because otherwise the break | |
1382 | * may get masked by ignore_status_mask | |
1383 | * or read_status_mask. | |
1384 | */ | |
dfe42443 | 1385 | if (uart_handle_break(port)) |
1da177e4 LT |
1386 | goto ignore_char; |
1387 | } else if (lsr & UART_LSR_PE) | |
dfe42443 | 1388 | port->icount.parity++; |
1da177e4 | 1389 | else if (lsr & UART_LSR_FE) |
dfe42443 | 1390 | port->icount.frame++; |
1da177e4 | 1391 | if (lsr & UART_LSR_OE) |
dfe42443 | 1392 | port->icount.overrun++; |
1da177e4 LT |
1393 | |
1394 | /* | |
23907eb8 | 1395 | * Mask off conditions which should be ignored. |
1da177e4 | 1396 | */ |
dfe42443 | 1397 | lsr &= port->read_status_mask; |
1da177e4 LT |
1398 | |
1399 | if (lsr & UART_LSR_BI) { | |
1400 | DEBUG_INTR("handling break...."); | |
1401 | flag = TTY_BREAK; | |
1402 | } else if (lsr & UART_LSR_PE) | |
1403 | flag = TTY_PARITY; | |
1404 | else if (lsr & UART_LSR_FE) | |
1405 | flag = TTY_FRAME; | |
1406 | } | |
dfe42443 | 1407 | if (uart_handle_sysrq_char(port, ch)) |
1da177e4 | 1408 | goto ignore_char; |
05ab3014 | 1409 | |
dfe42443 | 1410 | uart_insert_char(port, lsr, UART_LSR_OE, ch, flag); |
05ab3014 | 1411 | |
6f803cd0 | 1412 | ignore_char: |
0acf519f | 1413 | lsr = serial_in(up, UART_LSR); |
7500b1f6 | 1414 | } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); |
dfe42443 | 1415 | spin_unlock(&port->lock); |
2e124b4a | 1416 | tty_flip_buffer_push(&port->state->port); |
dfe42443 | 1417 | spin_lock(&port->lock); |
0690f41f | 1418 | return lsr; |
1da177e4 | 1419 | } |
3986fb2b | 1420 | EXPORT_SYMBOL_GPL(serial8250_rx_chars); |
1da177e4 | 1421 | |
3986fb2b | 1422 | void serial8250_tx_chars(struct uart_8250_port *up) |
1da177e4 | 1423 | { |
dfe42443 PG |
1424 | struct uart_port *port = &up->port; |
1425 | struct circ_buf *xmit = &port->state->xmit; | |
1da177e4 LT |
1426 | int count; |
1427 | ||
dfe42443 PG |
1428 | if (port->x_char) { |
1429 | serial_out(up, UART_TX, port->x_char); | |
1430 | port->icount.tx++; | |
1431 | port->x_char = 0; | |
1da177e4 LT |
1432 | return; |
1433 | } | |
dfe42443 PG |
1434 | if (uart_tx_stopped(port)) { |
1435 | serial8250_stop_tx(port); | |
b129a8cc RK |
1436 | return; |
1437 | } | |
1438 | if (uart_circ_empty(xmit)) { | |
e763b90c | 1439 | __stop_tx(up); |
1da177e4 LT |
1440 | return; |
1441 | } | |
1442 | ||
1443 | count = up->tx_loadsz; | |
1444 | do { | |
1445 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); | |
1446 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
dfe42443 | 1447 | port->icount.tx++; |
1da177e4 LT |
1448 | if (uart_circ_empty(xmit)) |
1449 | break; | |
ebebd49a SH |
1450 | if (up->capabilities & UART_CAP_HFIFO) { |
1451 | if ((serial_port_in(port, UART_LSR) & BOTH_EMPTY) != | |
1452 | BOTH_EMPTY) | |
1453 | break; | |
1454 | } | |
1da177e4 LT |
1455 | } while (--count > 0); |
1456 | ||
1457 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
dfe42443 | 1458 | uart_write_wakeup(port); |
1da177e4 LT |
1459 | |
1460 | DEBUG_INTR("THRE..."); | |
1461 | ||
1462 | if (uart_circ_empty(xmit)) | |
e763b90c | 1463 | __stop_tx(up); |
1da177e4 | 1464 | } |
3986fb2b | 1465 | EXPORT_SYMBOL_GPL(serial8250_tx_chars); |
1da177e4 | 1466 | |
5435d20f | 1467 | /* Caller holds uart port lock */ |
3986fb2b | 1468 | unsigned int serial8250_modem_status(struct uart_8250_port *up) |
1da177e4 | 1469 | { |
dfe42443 | 1470 | struct uart_port *port = &up->port; |
2af7cd68 RK |
1471 | unsigned int status = serial_in(up, UART_MSR); |
1472 | ||
ad4c2aa6 CM |
1473 | status |= up->msr_saved_flags; |
1474 | up->msr_saved_flags = 0; | |
fdc30b3d | 1475 | if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI && |
dfe42443 | 1476 | port->state != NULL) { |
2af7cd68 | 1477 | if (status & UART_MSR_TERI) |
dfe42443 | 1478 | port->icount.rng++; |
2af7cd68 | 1479 | if (status & UART_MSR_DDSR) |
dfe42443 | 1480 | port->icount.dsr++; |
2af7cd68 | 1481 | if (status & UART_MSR_DDCD) |
dfe42443 | 1482 | uart_handle_dcd_change(port, status & UART_MSR_DCD); |
2af7cd68 | 1483 | if (status & UART_MSR_DCTS) |
dfe42443 | 1484 | uart_handle_cts_change(port, status & UART_MSR_CTS); |
2af7cd68 | 1485 | |
dfe42443 | 1486 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
2af7cd68 | 1487 | } |
1da177e4 | 1488 | |
2af7cd68 | 1489 | return status; |
1da177e4 | 1490 | } |
3986fb2b | 1491 | EXPORT_SYMBOL_GPL(serial8250_modem_status); |
1da177e4 LT |
1492 | |
1493 | /* | |
1494 | * This handles the interrupt from one port. | |
1495 | */ | |
86b21199 | 1496 | int serial8250_handle_irq(struct uart_port *port, unsigned int iir) |
1da177e4 | 1497 | { |
0690f41f | 1498 | unsigned char status; |
4bf3631c | 1499 | unsigned long flags; |
b1261c86 | 1500 | struct uart_8250_port *up = up_to_u8250p(port); |
9ee4b83e | 1501 | int dma_err = 0; |
86b21199 PG |
1502 | |
1503 | if (iir & UART_IIR_NO_INT) | |
1504 | return 0; | |
45e24601 | 1505 | |
dfe42443 | 1506 | spin_lock_irqsave(&port->lock, flags); |
45e24601 | 1507 | |
4fd996a1 | 1508 | status = serial_port_in(port, UART_LSR); |
1da177e4 LT |
1509 | |
1510 | DEBUG_INTR("status = %x...", status); | |
1511 | ||
9ee4b83e HK |
1512 | if (status & (UART_LSR_DR | UART_LSR_BI)) { |
1513 | if (up->dma) | |
1514 | dma_err = serial8250_rx_dma(up, iir); | |
1515 | ||
1516 | if (!up->dma || dma_err) | |
1517 | status = serial8250_rx_chars(up, status); | |
1518 | } | |
3986fb2b | 1519 | serial8250_modem_status(up); |
b08c9c31 | 1520 | if (!up->dma && (status & UART_LSR_THRE)) |
3986fb2b | 1521 | serial8250_tx_chars(up); |
45e24601 | 1522 | |
dfe42443 | 1523 | spin_unlock_irqrestore(&port->lock, flags); |
86b21199 | 1524 | return 1; |
583d28e9 | 1525 | } |
c7a1bdc5 | 1526 | EXPORT_SYMBOL_GPL(serial8250_handle_irq); |
583d28e9 JI |
1527 | |
1528 | static int serial8250_default_handle_irq(struct uart_port *port) | |
1529 | { | |
4fd996a1 | 1530 | unsigned int iir = serial_port_in(port, UART_IIR); |
583d28e9 JI |
1531 | |
1532 | return serial8250_handle_irq(port, iir); | |
1533 | } | |
1534 | ||
dc96efb7 MS |
1535 | /* |
1536 | * These Exar UARTs have an extra interrupt indicator that could | |
1537 | * fire for a few unimplemented interrupts. One of which is a | |
1538 | * wakeup event when coming out of sleep. Put this here just | |
1539 | * to be on the safe side that these interrupts don't go unhandled. | |
1540 | */ | |
1541 | static int exar_handle_irq(struct uart_port *port) | |
1542 | { | |
1543 | unsigned char int0, int1, int2, int3; | |
1544 | unsigned int iir = serial_port_in(port, UART_IIR); | |
1545 | int ret; | |
1546 | ||
1547 | ret = serial8250_handle_irq(port, iir); | |
1548 | ||
30fa96a3 MS |
1549 | if ((port->type == PORT_XR17V35X) || |
1550 | (port->type == PORT_XR17D15X)) { | |
dc96efb7 MS |
1551 | int0 = serial_port_in(port, 0x80); |
1552 | int1 = serial_port_in(port, 0x81); | |
1553 | int2 = serial_port_in(port, 0x82); | |
1554 | int3 = serial_port_in(port, 0x83); | |
1555 | } | |
1556 | ||
1557 | return ret; | |
1558 | } | |
1559 | ||
1da177e4 LT |
1560 | /* |
1561 | * This is the serial driver's interrupt routine. | |
1562 | * | |
1563 | * Arjan thinks the old way was overly complex, so it got simplified. | |
1564 | * Alan disagrees, saying that need the complexity to handle the weird | |
1565 | * nature of ISA shared interrupts. (This is a special exception.) | |
1566 | * | |
1567 | * In order to handle ISA shared interrupts properly, we need to check | |
1568 | * that all ports have been serviced, and therefore the ISA interrupt | |
1569 | * line has been de-asserted. | |
1570 | * | |
1571 | * This means we need to loop through all ports. checking that they | |
1572 | * don't have an interrupt pending. | |
1573 | */ | |
7d12e780 | 1574 | static irqreturn_t serial8250_interrupt(int irq, void *dev_id) |
1da177e4 LT |
1575 | { |
1576 | struct irq_info *i = dev_id; | |
1577 | struct list_head *l, *end = NULL; | |
1578 | int pass_counter = 0, handled = 0; | |
1579 | ||
1580 | DEBUG_INTR("serial8250_interrupt(%d)...", irq); | |
1581 | ||
1582 | spin_lock(&i->lock); | |
1583 | ||
1584 | l = i->head; | |
1585 | do { | |
1586 | struct uart_8250_port *up; | |
583d28e9 | 1587 | struct uart_port *port; |
1da177e4 LT |
1588 | |
1589 | up = list_entry(l, struct uart_8250_port, list); | |
583d28e9 | 1590 | port = &up->port; |
1da177e4 | 1591 | |
49b532f9 | 1592 | if (port->handle_irq(port)) { |
1da177e4 | 1593 | handled = 1; |
1da177e4 LT |
1594 | end = NULL; |
1595 | } else if (end == NULL) | |
1596 | end = l; | |
1597 | ||
1598 | l = l->next; | |
1599 | ||
1600 | if (l == i->head && pass_counter++ > PASS_LIMIT) { | |
1601 | /* If we hit this, we're dead. */ | |
cd3ecad1 DD |
1602 | printk_ratelimited(KERN_ERR |
1603 | "serial8250: too much work for irq%d\n", irq); | |
1da177e4 LT |
1604 | break; |
1605 | } | |
1606 | } while (l != end); | |
1607 | ||
1608 | spin_unlock(&i->lock); | |
1609 | ||
1610 | DEBUG_INTR("end.\n"); | |
1611 | ||
1612 | return IRQ_RETVAL(handled); | |
1613 | } | |
1614 | ||
1615 | /* | |
1616 | * To support ISA shared interrupts, we need to have one interrupt | |
1617 | * handler that ensures that the IRQ line has been deasserted | |
1618 | * before returning. Failing to do this will result in the IRQ | |
1619 | * line being stuck active, and, since ISA irqs are edge triggered, | |
1620 | * no more IRQs will be seen. | |
1621 | */ | |
1622 | static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up) | |
1623 | { | |
1624 | spin_lock_irq(&i->lock); | |
1625 | ||
1626 | if (!list_empty(i->head)) { | |
1627 | if (i->head == &up->list) | |
1628 | i->head = i->head->next; | |
1629 | list_del(&up->list); | |
1630 | } else { | |
1631 | BUG_ON(i->head != &up->list); | |
1632 | i->head = NULL; | |
1633 | } | |
1da177e4 | 1634 | spin_unlock_irq(&i->lock); |
25db8ad5 AC |
1635 | /* List empty so throw away the hash node */ |
1636 | if (i->head == NULL) { | |
1637 | hlist_del(&i->node); | |
1638 | kfree(i); | |
1639 | } | |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | static int serial_link_irq_chain(struct uart_8250_port *up) | |
1643 | { | |
25db8ad5 AC |
1644 | struct hlist_head *h; |
1645 | struct hlist_node *n; | |
1646 | struct irq_info *i; | |
40663cc7 | 1647 | int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; |
1da177e4 | 1648 | |
25db8ad5 AC |
1649 | mutex_lock(&hash_mutex); |
1650 | ||
1651 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; | |
1652 | ||
1653 | hlist_for_each(n, h) { | |
1654 | i = hlist_entry(n, struct irq_info, node); | |
1655 | if (i->irq == up->port.irq) | |
1656 | break; | |
1657 | } | |
1658 | ||
1659 | if (n == NULL) { | |
1660 | i = kzalloc(sizeof(struct irq_info), GFP_KERNEL); | |
1661 | if (i == NULL) { | |
1662 | mutex_unlock(&hash_mutex); | |
1663 | return -ENOMEM; | |
1664 | } | |
1665 | spin_lock_init(&i->lock); | |
1666 | i->irq = up->port.irq; | |
1667 | hlist_add_head(&i->node, h); | |
1668 | } | |
1669 | mutex_unlock(&hash_mutex); | |
1670 | ||
1da177e4 LT |
1671 | spin_lock_irq(&i->lock); |
1672 | ||
1673 | if (i->head) { | |
1674 | list_add(&up->list, i->head); | |
1675 | spin_unlock_irq(&i->lock); | |
1676 | ||
1677 | ret = 0; | |
1678 | } else { | |
1679 | INIT_LIST_HEAD(&up->list); | |
1680 | i->head = &up->list; | |
1681 | spin_unlock_irq(&i->lock); | |
1c2f0493 | 1682 | irq_flags |= up->port.irqflags; |
1da177e4 LT |
1683 | ret = request_irq(up->port.irq, serial8250_interrupt, |
1684 | irq_flags, "serial", i); | |
1685 | if (ret < 0) | |
1686 | serial_do_unlink(i, up); | |
1687 | } | |
1688 | ||
1689 | return ret; | |
1690 | } | |
1691 | ||
1692 | static void serial_unlink_irq_chain(struct uart_8250_port *up) | |
1693 | { | |
bd2fe272 PG |
1694 | /* |
1695 | * yes, some broken gcc emit "warning: 'i' may be used uninitialized" | |
1696 | * but no, we are not going to take a patch that assigns NULL below. | |
1697 | */ | |
25db8ad5 AC |
1698 | struct irq_info *i; |
1699 | struct hlist_node *n; | |
1700 | struct hlist_head *h; | |
1da177e4 | 1701 | |
25db8ad5 AC |
1702 | mutex_lock(&hash_mutex); |
1703 | ||
1704 | h = &irq_lists[up->port.irq % NR_IRQ_HASH]; | |
1705 | ||
1706 | hlist_for_each(n, h) { | |
1707 | i = hlist_entry(n, struct irq_info, node); | |
1708 | if (i->irq == up->port.irq) | |
1709 | break; | |
1710 | } | |
1711 | ||
1712 | BUG_ON(n == NULL); | |
1da177e4 LT |
1713 | BUG_ON(i->head == NULL); |
1714 | ||
1715 | if (list_empty(i->head)) | |
1716 | free_irq(up->port.irq, i); | |
1717 | ||
1718 | serial_do_unlink(i, up); | |
25db8ad5 | 1719 | mutex_unlock(&hash_mutex); |
1da177e4 LT |
1720 | } |
1721 | ||
1722 | /* | |
1723 | * This function is used to handle ports that do not have an | |
1724 | * interrupt. This doesn't work very well for 16450's, but gives | |
1725 | * barely passable results for a 16550A. (Although at the expense | |
1726 | * of much CPU overhead). | |
1727 | */ | |
1728 | static void serial8250_timeout(unsigned long data) | |
1729 | { | |
1730 | struct uart_8250_port *up = (struct uart_8250_port *)data; | |
1da177e4 | 1731 | |
a0431476 | 1732 | up->port.handle_irq(&up->port); |
54381067 | 1733 | mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); |
40b36daa AW |
1734 | } |
1735 | ||
1736 | static void serial8250_backup_timeout(unsigned long data) | |
1737 | { | |
1738 | struct uart_8250_port *up = (struct uart_8250_port *)data; | |
ad4c2aa6 CM |
1739 | unsigned int iir, ier = 0, lsr; |
1740 | unsigned long flags; | |
40b36daa | 1741 | |
dbb3b1ca AC |
1742 | spin_lock_irqsave(&up->port.lock, flags); |
1743 | ||
40b36daa AW |
1744 | /* |
1745 | * Must disable interrupts or else we risk racing with the interrupt | |
1746 | * based handler. | |
1747 | */ | |
d4e33fac | 1748 | if (up->port.irq) { |
40b36daa AW |
1749 | ier = serial_in(up, UART_IER); |
1750 | serial_out(up, UART_IER, 0); | |
1751 | } | |
1da177e4 | 1752 | |
40b36daa AW |
1753 | iir = serial_in(up, UART_IIR); |
1754 | ||
1755 | /* | |
1756 | * This should be a safe test for anyone who doesn't trust the | |
1757 | * IIR bits on their UART, but it's specifically designed for | |
1758 | * the "Diva" UART used on the management processor on many HP | |
1759 | * ia64 and parisc boxes. | |
1760 | */ | |
ad4c2aa6 CM |
1761 | lsr = serial_in(up, UART_LSR); |
1762 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; | |
40b36daa | 1763 | if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) && |
ebd2c8f6 | 1764 | (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) && |
ad4c2aa6 | 1765 | (lsr & UART_LSR_THRE)) { |
40b36daa AW |
1766 | iir &= ~(UART_IIR_ID | UART_IIR_NO_INT); |
1767 | iir |= UART_IIR_THRI; | |
1768 | } | |
1769 | ||
1770 | if (!(iir & UART_IIR_NO_INT)) | |
3986fb2b | 1771 | serial8250_tx_chars(up); |
40b36daa | 1772 | |
d4e33fac | 1773 | if (up->port.irq) |
40b36daa AW |
1774 | serial_out(up, UART_IER, ier); |
1775 | ||
dbb3b1ca AC |
1776 | spin_unlock_irqrestore(&up->port.lock, flags); |
1777 | ||
40b36daa | 1778 | /* Standard timer interval plus 0.2s to keep the port running */ |
6f803cd0 | 1779 | mod_timer(&up->timer, |
54381067 | 1780 | jiffies + uart_poll_timeout(&up->port) + HZ / 5); |
1da177e4 LT |
1781 | } |
1782 | ||
1783 | static unsigned int serial8250_tx_empty(struct uart_port *port) | |
1784 | { | |
b1261c86 | 1785 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 | 1786 | unsigned long flags; |
ad4c2aa6 | 1787 | unsigned int lsr; |
1da177e4 | 1788 | |
dfe42443 | 1789 | spin_lock_irqsave(&port->lock, flags); |
4fd996a1 | 1790 | lsr = serial_port_in(port, UART_LSR); |
ad4c2aa6 | 1791 | up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; |
dfe42443 | 1792 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 1793 | |
bca47613 | 1794 | return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0; |
1da177e4 LT |
1795 | } |
1796 | ||
1797 | static unsigned int serial8250_get_mctrl(struct uart_port *port) | |
1798 | { | |
b1261c86 | 1799 | struct uart_8250_port *up = up_to_u8250p(port); |
2af7cd68 | 1800 | unsigned int status; |
1da177e4 LT |
1801 | unsigned int ret; |
1802 | ||
3986fb2b | 1803 | status = serial8250_modem_status(up); |
1da177e4 LT |
1804 | |
1805 | ret = 0; | |
1806 | if (status & UART_MSR_DCD) | |
1807 | ret |= TIOCM_CAR; | |
1808 | if (status & UART_MSR_RI) | |
1809 | ret |= TIOCM_RNG; | |
1810 | if (status & UART_MSR_DSR) | |
1811 | ret |= TIOCM_DSR; | |
1812 | if (status & UART_MSR_CTS) | |
1813 | ret |= TIOCM_CTS; | |
1814 | return ret; | |
1815 | } | |
1816 | ||
1817 | static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
1818 | { | |
b1261c86 | 1819 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 LT |
1820 | unsigned char mcr = 0; |
1821 | ||
1822 | if (mctrl & TIOCM_RTS) | |
1823 | mcr |= UART_MCR_RTS; | |
1824 | if (mctrl & TIOCM_DTR) | |
1825 | mcr |= UART_MCR_DTR; | |
1826 | if (mctrl & TIOCM_OUT1) | |
1827 | mcr |= UART_MCR_OUT1; | |
1828 | if (mctrl & TIOCM_OUT2) | |
1829 | mcr |= UART_MCR_OUT2; | |
1830 | if (mctrl & TIOCM_LOOP) | |
1831 | mcr |= UART_MCR_LOOP; | |
1832 | ||
1833 | mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr; | |
1834 | ||
4fd996a1 | 1835 | serial_port_out(port, UART_MCR, mcr); |
1da177e4 LT |
1836 | } |
1837 | ||
1838 | static void serial8250_break_ctl(struct uart_port *port, int break_state) | |
1839 | { | |
b1261c86 | 1840 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 LT |
1841 | unsigned long flags; |
1842 | ||
dfe42443 | 1843 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
1844 | if (break_state == -1) |
1845 | up->lcr |= UART_LCR_SBC; | |
1846 | else | |
1847 | up->lcr &= ~UART_LCR_SBC; | |
4fd996a1 | 1848 | serial_port_out(port, UART_LCR, up->lcr); |
dfe42443 | 1849 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
1850 | } |
1851 | ||
40b36daa AW |
1852 | /* |
1853 | * Wait for transmitter & holding register to empty | |
1854 | */ | |
b5d674ab | 1855 | static void wait_for_xmitr(struct uart_8250_port *up, int bits) |
40b36daa AW |
1856 | { |
1857 | unsigned int status, tmout = 10000; | |
1858 | ||
1859 | /* Wait up to 10ms for the character(s) to be sent. */ | |
97d303b7 | 1860 | for (;;) { |
40b36daa AW |
1861 | status = serial_in(up, UART_LSR); |
1862 | ||
ad4c2aa6 | 1863 | up->lsr_saved_flags |= status & LSR_SAVE_FLAGS; |
40b36daa | 1864 | |
97d303b7 DD |
1865 | if ((status & bits) == bits) |
1866 | break; | |
40b36daa AW |
1867 | if (--tmout == 0) |
1868 | break; | |
1869 | udelay(1); | |
97d303b7 | 1870 | } |
40b36daa AW |
1871 | |
1872 | /* Wait up to 1s for flow control if necessary */ | |
1873 | if (up->port.flags & UPF_CONS_FLOW) { | |
ad4c2aa6 CM |
1874 | unsigned int tmout; |
1875 | for (tmout = 1000000; tmout; tmout--) { | |
1876 | unsigned int msr = serial_in(up, UART_MSR); | |
1877 | up->msr_saved_flags |= msr & MSR_SAVE_FLAGS; | |
1878 | if (msr & UART_MSR_CTS) | |
1879 | break; | |
40b36daa AW |
1880 | udelay(1); |
1881 | touch_nmi_watchdog(); | |
1882 | } | |
1883 | } | |
1884 | } | |
1885 | ||
f2d937f3 JW |
1886 | #ifdef CONFIG_CONSOLE_POLL |
1887 | /* | |
1888 | * Console polling routines for writing and reading from the uart while | |
1889 | * in an interrupt or debug context. | |
1890 | */ | |
1891 | ||
1892 | static int serial8250_get_poll_char(struct uart_port *port) | |
1893 | { | |
4fd996a1 | 1894 | unsigned char lsr = serial_port_in(port, UART_LSR); |
f2d937f3 | 1895 | |
f5316b4a JW |
1896 | if (!(lsr & UART_LSR_DR)) |
1897 | return NO_POLL_CHAR; | |
f2d937f3 | 1898 | |
4fd996a1 | 1899 | return serial_port_in(port, UART_RX); |
f2d937f3 JW |
1900 | } |
1901 | ||
1902 | ||
1903 | static void serial8250_put_poll_char(struct uart_port *port, | |
1904 | unsigned char c) | |
1905 | { | |
1906 | unsigned int ier; | |
b1261c86 | 1907 | struct uart_8250_port *up = up_to_u8250p(port); |
f2d937f3 JW |
1908 | |
1909 | /* | |
1910 | * First save the IER then disable the interrupts | |
1911 | */ | |
4fd996a1 | 1912 | ier = serial_port_in(port, UART_IER); |
f2d937f3 | 1913 | if (up->capabilities & UART_CAP_UUE) |
4fd996a1 | 1914 | serial_port_out(port, UART_IER, UART_IER_UUE); |
f2d937f3 | 1915 | else |
4fd996a1 | 1916 | serial_port_out(port, UART_IER, 0); |
f2d937f3 JW |
1917 | |
1918 | wait_for_xmitr(up, BOTH_EMPTY); | |
1919 | /* | |
1920 | * Send the character out. | |
f2d937f3 | 1921 | */ |
4fd996a1 | 1922 | serial_port_out(port, UART_TX, c); |
f2d937f3 JW |
1923 | |
1924 | /* | |
1925 | * Finally, wait for transmitter to become empty | |
1926 | * and restore the IER | |
1927 | */ | |
1928 | wait_for_xmitr(up, BOTH_EMPTY); | |
4fd996a1 | 1929 | serial_port_out(port, UART_IER, ier); |
f2d937f3 JW |
1930 | } |
1931 | ||
1932 | #endif /* CONFIG_CONSOLE_POLL */ | |
1933 | ||
b99b121b | 1934 | int serial8250_do_startup(struct uart_port *port) |
1da177e4 | 1935 | { |
b1261c86 | 1936 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 | 1937 | unsigned long flags; |
55d3b282 | 1938 | unsigned char lsr, iir; |
1da177e4 LT |
1939 | int retval; |
1940 | ||
65ecc9c0 SY |
1941 | if (port->type == PORT_8250_CIR) |
1942 | return -ENODEV; | |
1943 | ||
9660497c HK |
1944 | if (!port->fifosize) |
1945 | port->fifosize = uart_config[port->type].fifo_size; | |
1946 | if (!up->tx_loadsz) | |
1947 | up->tx_loadsz = uart_config[port->type].tx_loadsz; | |
1948 | if (!up->capabilities) | |
1949 | up->capabilities = uart_config[port->type].flags; | |
1da177e4 LT |
1950 | up->mcr = 0; |
1951 | ||
dfe42443 | 1952 | if (port->iotype != up->cur_iotype) |
b8e7e40a AC |
1953 | set_io_from_upio(port); |
1954 | ||
dfe42443 | 1955 | if (port->type == PORT_16C950) { |
1da177e4 LT |
1956 | /* Wake up and initialize UART */ |
1957 | up->acr = 0; | |
4fd996a1 PG |
1958 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
1959 | serial_port_out(port, UART_EFR, UART_EFR_ECB); | |
1960 | serial_port_out(port, UART_IER, 0); | |
1961 | serial_port_out(port, UART_LCR, 0); | |
1da177e4 | 1962 | serial_icr_write(up, UART_CSR, 0); /* Reset the UART */ |
4fd996a1 PG |
1963 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
1964 | serial_port_out(port, UART_EFR, UART_EFR_ECB); | |
1965 | serial_port_out(port, UART_LCR, 0); | |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | #ifdef CONFIG_SERIAL_8250_RSA | |
1969 | /* | |
1970 | * If this is an RSA port, see if we can kick it up to the | |
1971 | * higher speed clock. | |
1972 | */ | |
1973 | enable_rsa(up); | |
1974 | #endif | |
1975 | ||
1976 | /* | |
1977 | * Clear the FIFO buffers and disable them. | |
7f927fcc | 1978 | * (they will be reenabled in set_termios()) |
1da177e4 LT |
1979 | */ |
1980 | serial8250_clear_fifos(up); | |
1981 | ||
1982 | /* | |
1983 | * Clear the interrupt registers. | |
1984 | */ | |
4fd996a1 PG |
1985 | serial_port_in(port, UART_LSR); |
1986 | serial_port_in(port, UART_RX); | |
1987 | serial_port_in(port, UART_IIR); | |
1988 | serial_port_in(port, UART_MSR); | |
1da177e4 LT |
1989 | |
1990 | /* | |
1991 | * At this point, there's no way the LSR could still be 0xff; | |
1992 | * if it is, then bail out, because there's likely no UART | |
1993 | * here. | |
1994 | */ | |
dfe42443 | 1995 | if (!(port->flags & UPF_BUGGY_UART) && |
4fd996a1 | 1996 | (serial_port_in(port, UART_LSR) == 0xff)) { |
7808a4c4 | 1997 | printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n", |
dfe42443 | 1998 | serial_index(port)); |
1da177e4 LT |
1999 | return -ENODEV; |
2000 | } | |
2001 | ||
2002 | /* | |
2003 | * For a XR16C850, we need to set the trigger levels | |
2004 | */ | |
dfe42443 | 2005 | if (port->type == PORT_16850) { |
1da177e4 LT |
2006 | unsigned char fctr; |
2007 | ||
0acf519f | 2008 | serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
1da177e4 | 2009 | |
0acf519f | 2010 | fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); |
4fd996a1 PG |
2011 | serial_port_out(port, UART_FCTR, |
2012 | fctr | UART_FCTR_TRGD | UART_FCTR_RX); | |
2013 | serial_port_out(port, UART_TRG, UART_TRG_96); | |
2014 | serial_port_out(port, UART_FCTR, | |
2015 | fctr | UART_FCTR_TRGD | UART_FCTR_TX); | |
2016 | serial_port_out(port, UART_TRG, UART_TRG_96); | |
1da177e4 | 2017 | |
4fd996a1 | 2018 | serial_port_out(port, UART_LCR, 0); |
1da177e4 LT |
2019 | } |
2020 | ||
dfe42443 | 2021 | if (port->irq) { |
01c194d9 | 2022 | unsigned char iir1; |
40b36daa AW |
2023 | /* |
2024 | * Test for UARTs that do not reassert THRE when the | |
2025 | * transmitter is idle and the interrupt has already | |
2026 | * been cleared. Real 16550s should always reassert | |
2027 | * this interrupt whenever the transmitter is idle and | |
2028 | * the interrupt is enabled. Delays are necessary to | |
2029 | * allow register changes to become visible. | |
2030 | */ | |
dfe42443 | 2031 | spin_lock_irqsave(&port->lock, flags); |
1c2f0493 | 2032 | if (up->port.irqflags & IRQF_SHARED) |
dfe42443 | 2033 | disable_irq_nosync(port->irq); |
40b36daa AW |
2034 | |
2035 | wait_for_xmitr(up, UART_LSR_THRE); | |
55e4016d | 2036 | serial_port_out_sync(port, UART_IER, UART_IER_THRI); |
40b36daa | 2037 | udelay(1); /* allow THRE to set */ |
4fd996a1 PG |
2038 | iir1 = serial_port_in(port, UART_IIR); |
2039 | serial_port_out(port, UART_IER, 0); | |
55e4016d | 2040 | serial_port_out_sync(port, UART_IER, UART_IER_THRI); |
40b36daa | 2041 | udelay(1); /* allow a working UART time to re-assert THRE */ |
4fd996a1 PG |
2042 | iir = serial_port_in(port, UART_IIR); |
2043 | serial_port_out(port, UART_IER, 0); | |
40b36daa | 2044 | |
dfe42443 PG |
2045 | if (port->irqflags & IRQF_SHARED) |
2046 | enable_irq(port->irq); | |
2047 | spin_unlock_irqrestore(&port->lock, flags); | |
40b36daa AW |
2048 | |
2049 | /* | |
bc02d15a DW |
2050 | * If the interrupt is not reasserted, or we otherwise |
2051 | * don't trust the iir, setup a timer to kick the UART | |
2052 | * on a regular basis. | |
40b36daa | 2053 | */ |
bc02d15a DW |
2054 | if ((!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) || |
2055 | up->port.flags & UPF_BUG_THRE) { | |
363f66fe | 2056 | up->bugs |= UART_BUG_THRE; |
8440838b DM |
2057 | pr_debug("ttyS%d - using backup timer\n", |
2058 | serial_index(port)); | |
40b36daa AW |
2059 | } |
2060 | } | |
2061 | ||
363f66fe WN |
2062 | /* |
2063 | * The above check will only give an accurate result the first time | |
2064 | * the port is opened so this value needs to be preserved. | |
2065 | */ | |
2066 | if (up->bugs & UART_BUG_THRE) { | |
2067 | up->timer.function = serial8250_backup_timeout; | |
2068 | up->timer.data = (unsigned long)up; | |
2069 | mod_timer(&up->timer, jiffies + | |
54381067 | 2070 | uart_poll_timeout(port) + HZ / 5); |
363f66fe WN |
2071 | } |
2072 | ||
1da177e4 LT |
2073 | /* |
2074 | * If the "interrupt" for this port doesn't correspond with any | |
2075 | * hardware interrupt, we use a timer-based system. The original | |
2076 | * driver used to do this with IRQ0. | |
2077 | */ | |
dfe42443 | 2078 | if (!port->irq) { |
1da177e4 | 2079 | up->timer.data = (unsigned long)up; |
54381067 | 2080 | mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); |
1da177e4 LT |
2081 | } else { |
2082 | retval = serial_link_irq_chain(up); | |
2083 | if (retval) | |
2084 | return retval; | |
2085 | } | |
2086 | ||
2087 | /* | |
2088 | * Now, initialize the UART | |
2089 | */ | |
4fd996a1 | 2090 | serial_port_out(port, UART_LCR, UART_LCR_WLEN8); |
1da177e4 | 2091 | |
dfe42443 | 2092 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 | 2093 | if (up->port.flags & UPF_FOURPORT) { |
d4e33fac | 2094 | if (!up->port.irq) |
1da177e4 LT |
2095 | up->port.mctrl |= TIOCM_OUT1; |
2096 | } else | |
2097 | /* | |
2098 | * Most PC uarts need OUT2 raised to enable interrupts. | |
2099 | */ | |
dfe42443 | 2100 | if (port->irq) |
1da177e4 LT |
2101 | up->port.mctrl |= TIOCM_OUT2; |
2102 | ||
dfe42443 | 2103 | serial8250_set_mctrl(port, port->mctrl); |
55d3b282 | 2104 | |
b6adea33 MCC |
2105 | /* Serial over Lan (SoL) hack: |
2106 | Intel 8257x Gigabit ethernet chips have a | |
2107 | 16550 emulation, to be used for Serial Over Lan. | |
2108 | Those chips take a longer time than a normal | |
2109 | serial device to signalize that a transmission | |
2110 | data was queued. Due to that, the above test generally | |
2111 | fails. One solution would be to delay the reading of | |
2112 | iir. However, this is not reliable, since the timeout | |
2113 | is variable. So, let's just don't test if we receive | |
2114 | TX irq. This way, we'll never enable UART_BUG_TXEN. | |
2115 | */ | |
d41a4b51 | 2116 | if (skip_txen_test || up->port.flags & UPF_NO_TXEN_TEST) |
b6adea33 MCC |
2117 | goto dont_test_tx_en; |
2118 | ||
55d3b282 RK |
2119 | /* |
2120 | * Do a quick test to see if we receive an | |
2121 | * interrupt when we enable the TX irq. | |
2122 | */ | |
4fd996a1 PG |
2123 | serial_port_out(port, UART_IER, UART_IER_THRI); |
2124 | lsr = serial_port_in(port, UART_LSR); | |
2125 | iir = serial_port_in(port, UART_IIR); | |
2126 | serial_port_out(port, UART_IER, 0); | |
55d3b282 RK |
2127 | |
2128 | if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) { | |
67f7654e RK |
2129 | if (!(up->bugs & UART_BUG_TXEN)) { |
2130 | up->bugs |= UART_BUG_TXEN; | |
55d3b282 | 2131 | pr_debug("ttyS%d - enabling bad tx status workarounds\n", |
8440838b | 2132 | serial_index(port)); |
55d3b282 RK |
2133 | } |
2134 | } else { | |
67f7654e | 2135 | up->bugs &= ~UART_BUG_TXEN; |
55d3b282 RK |
2136 | } |
2137 | ||
b6adea33 | 2138 | dont_test_tx_en: |
dfe42443 | 2139 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 | 2140 | |
ad4c2aa6 CM |
2141 | /* |
2142 | * Clear the interrupt registers again for luck, and clear the | |
2143 | * saved flags to avoid getting false values from polling | |
2144 | * routines or the previous session. | |
2145 | */ | |
4fd996a1 PG |
2146 | serial_port_in(port, UART_LSR); |
2147 | serial_port_in(port, UART_RX); | |
2148 | serial_port_in(port, UART_IIR); | |
2149 | serial_port_in(port, UART_MSR); | |
ad4c2aa6 CM |
2150 | up->lsr_saved_flags = 0; |
2151 | up->msr_saved_flags = 0; | |
2152 | ||
9ee4b83e HK |
2153 | /* |
2154 | * Request DMA channels for both RX and TX. | |
2155 | */ | |
2156 | if (up->dma) { | |
2157 | retval = serial8250_request_dma(up); | |
2158 | if (retval) { | |
2159 | pr_warn_ratelimited("ttyS%d - failed to request DMA\n", | |
2160 | serial_index(port)); | |
2161 | up->dma = NULL; | |
2162 | } | |
2163 | } | |
2164 | ||
1da177e4 LT |
2165 | /* |
2166 | * Finally, enable interrupts. Note: Modem status interrupts | |
2167 | * are set via set_termios(), which will be occurring imminently | |
2168 | * anyway, so we don't enable them here. | |
2169 | */ | |
2170 | up->ier = UART_IER_RLSI | UART_IER_RDI; | |
4fd996a1 | 2171 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 | 2172 | |
dfe42443 | 2173 | if (port->flags & UPF_FOURPORT) { |
1da177e4 LT |
2174 | unsigned int icp; |
2175 | /* | |
2176 | * Enable interrupts on the AST Fourport board | |
2177 | */ | |
dfe42443 | 2178 | icp = (port->iobase & 0xfe0) | 0x01f; |
1da177e4 | 2179 | outb_p(0x80, icp); |
0d263a26 | 2180 | inb_p(icp); |
1da177e4 LT |
2181 | } |
2182 | ||
1da177e4 LT |
2183 | return 0; |
2184 | } | |
b99b121b | 2185 | EXPORT_SYMBOL_GPL(serial8250_do_startup); |
1da177e4 | 2186 | |
b99b121b SAS |
2187 | static int serial8250_startup(struct uart_port *port) |
2188 | { | |
2189 | if (port->startup) | |
2190 | return port->startup(port); | |
2191 | return serial8250_do_startup(port); | |
2192 | } | |
2193 | ||
2194 | void serial8250_do_shutdown(struct uart_port *port) | |
1da177e4 | 2195 | { |
b1261c86 | 2196 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 LT |
2197 | unsigned long flags; |
2198 | ||
2199 | /* | |
2200 | * Disable interrupts from this port | |
2201 | */ | |
2202 | up->ier = 0; | |
4fd996a1 | 2203 | serial_port_out(port, UART_IER, 0); |
1da177e4 | 2204 | |
9ee4b83e HK |
2205 | if (up->dma) |
2206 | serial8250_release_dma(up); | |
2207 | ||
dfe42443 PG |
2208 | spin_lock_irqsave(&port->lock, flags); |
2209 | if (port->flags & UPF_FOURPORT) { | |
1da177e4 | 2210 | /* reset interrupts on the AST Fourport board */ |
dfe42443 PG |
2211 | inb((port->iobase & 0xfe0) | 0x1f); |
2212 | port->mctrl |= TIOCM_OUT1; | |
1da177e4 | 2213 | } else |
dfe42443 | 2214 | port->mctrl &= ~TIOCM_OUT2; |
1da177e4 | 2215 | |
dfe42443 PG |
2216 | serial8250_set_mctrl(port, port->mctrl); |
2217 | spin_unlock_irqrestore(&port->lock, flags); | |
1da177e4 LT |
2218 | |
2219 | /* | |
2220 | * Disable break condition and FIFOs | |
2221 | */ | |
4fd996a1 PG |
2222 | serial_port_out(port, UART_LCR, |
2223 | serial_port_in(port, UART_LCR) & ~UART_LCR_SBC); | |
1da177e4 LT |
2224 | serial8250_clear_fifos(up); |
2225 | ||
2226 | #ifdef CONFIG_SERIAL_8250_RSA | |
2227 | /* | |
2228 | * Reset the RSA board back to 115kbps compat mode. | |
2229 | */ | |
2230 | disable_rsa(up); | |
2231 | #endif | |
2232 | ||
2233 | /* | |
2234 | * Read data port to reset things, and then unlink from | |
2235 | * the IRQ chain. | |
2236 | */ | |
4fd996a1 | 2237 | serial_port_in(port, UART_RX); |
1da177e4 | 2238 | |
40b36daa AW |
2239 | del_timer_sync(&up->timer); |
2240 | up->timer.function = serial8250_timeout; | |
dfe42443 | 2241 | if (port->irq) |
1da177e4 LT |
2242 | serial_unlink_irq_chain(up); |
2243 | } | |
b99b121b SAS |
2244 | EXPORT_SYMBOL_GPL(serial8250_do_shutdown); |
2245 | ||
2246 | static void serial8250_shutdown(struct uart_port *port) | |
2247 | { | |
2248 | if (port->shutdown) | |
2249 | port->shutdown(port); | |
2250 | else | |
2251 | serial8250_do_shutdown(port); | |
2252 | } | |
1da177e4 LT |
2253 | |
2254 | static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud) | |
2255 | { | |
2256 | unsigned int quot; | |
2257 | ||
2258 | /* | |
2259 | * Handle magic divisors for baud rates above baud_base on | |
2260 | * SMSC SuperIO chips. | |
2261 | */ | |
2262 | if ((port->flags & UPF_MAGIC_MULTIPLIER) && | |
2263 | baud == (port->uartclk/4)) | |
2264 | quot = 0x8001; | |
2265 | else if ((port->flags & UPF_MAGIC_MULTIPLIER) && | |
2266 | baud == (port->uartclk/8)) | |
2267 | quot = 0x8002; | |
2268 | else | |
2269 | quot = uart_get_divisor(port, baud); | |
2270 | ||
2271 | return quot; | |
2272 | } | |
2273 | ||
235dae5d PL |
2274 | void |
2275 | serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, | |
2276 | struct ktermios *old) | |
1da177e4 | 2277 | { |
b1261c86 | 2278 | struct uart_8250_port *up = up_to_u8250p(port); |
aef9a7bd | 2279 | unsigned char cval; |
1da177e4 LT |
2280 | unsigned long flags; |
2281 | unsigned int baud, quot; | |
2282 | ||
2283 | switch (termios->c_cflag & CSIZE) { | |
2284 | case CS5: | |
0a8b80c5 | 2285 | cval = UART_LCR_WLEN5; |
1da177e4 LT |
2286 | break; |
2287 | case CS6: | |
0a8b80c5 | 2288 | cval = UART_LCR_WLEN6; |
1da177e4 LT |
2289 | break; |
2290 | case CS7: | |
0a8b80c5 | 2291 | cval = UART_LCR_WLEN7; |
1da177e4 LT |
2292 | break; |
2293 | default: | |
2294 | case CS8: | |
0a8b80c5 | 2295 | cval = UART_LCR_WLEN8; |
1da177e4 LT |
2296 | break; |
2297 | } | |
2298 | ||
2299 | if (termios->c_cflag & CSTOPB) | |
0a8b80c5 | 2300 | cval |= UART_LCR_STOP; |
eb26dfe8 | 2301 | if (termios->c_cflag & PARENB) { |
1da177e4 | 2302 | cval |= UART_LCR_PARITY; |
eb26dfe8 | 2303 | if (up->bugs & UART_BUG_PARITY) |
aef9a7bd | 2304 | up->fifo_bug = true; |
eb26dfe8 | 2305 | } |
1da177e4 LT |
2306 | if (!(termios->c_cflag & PARODD)) |
2307 | cval |= UART_LCR_EPAR; | |
2308 | #ifdef CMSPAR | |
2309 | if (termios->c_cflag & CMSPAR) | |
2310 | cval |= UART_LCR_SPAR; | |
2311 | #endif | |
2312 | ||
2313 | /* | |
2314 | * Ask the core to calculate the divisor for us. | |
2315 | */ | |
24d481ec AV |
2316 | baud = uart_get_baud_rate(port, termios, old, |
2317 | port->uartclk / 16 / 0xffff, | |
2318 | port->uartclk / 16); | |
1da177e4 LT |
2319 | quot = serial8250_get_divisor(port, baud); |
2320 | ||
2321 | /* | |
4ba5e35d | 2322 | * Oxford Semi 952 rev B workaround |
1da177e4 | 2323 | */ |
4ba5e35d | 2324 | if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0) |
3e8d4e20 | 2325 | quot++; |
1da177e4 | 2326 | |
dfe42443 | 2327 | if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) { |
aef9a7bd YY |
2328 | /* NOTE: If fifo_bug is not set, a user can set RX_trigger. */ |
2329 | if ((baud < 2400 && !up->dma) || up->fifo_bug) { | |
2330 | up->fcr &= ~UART_FCR_TRIGGER_MASK; | |
2331 | up->fcr |= UART_FCR_TRIGGER_1; | |
f9a9111b | 2332 | } |
1da177e4 LT |
2333 | } |
2334 | ||
2335 | /* | |
2336 | * MCR-based auto flow control. When AFE is enabled, RTS will be | |
2337 | * deasserted when the receive FIFO contains more characters than | |
2338 | * the trigger, or the MCR RTS bit is cleared. In the case where | |
2339 | * the remote UART is not using CTS auto flow control, we must | |
2340 | * have sufficient FIFO entries for the latency of the remote | |
a6eec92e | 2341 | * UART to respond. IOW, at least 32 bytes of FIFO. |
1da177e4 | 2342 | */ |
a6eec92e | 2343 | if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) { |
1da177e4 LT |
2344 | up->mcr &= ~UART_MCR_AFE; |
2345 | if (termios->c_cflag & CRTSCTS) | |
2346 | up->mcr |= UART_MCR_AFE; | |
2347 | } | |
2348 | ||
2349 | /* | |
2350 | * Ok, we're now changing the port state. Do it with | |
2351 | * interrupts disabled. | |
2352 | */ | |
dfe42443 | 2353 | spin_lock_irqsave(&port->lock, flags); |
1da177e4 LT |
2354 | |
2355 | /* | |
2356 | * Update the per-port timeout. | |
2357 | */ | |
2358 | uart_update_timeout(port, termios->c_cflag, baud); | |
2359 | ||
dfe42443 | 2360 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
1da177e4 | 2361 | if (termios->c_iflag & INPCK) |
dfe42443 | 2362 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
ef8b9ddc | 2363 | if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
dfe42443 | 2364 | port->read_status_mask |= UART_LSR_BI; |
1da177e4 LT |
2365 | |
2366 | /* | |
2367 | * Characteres to ignore | |
2368 | */ | |
dfe42443 | 2369 | port->ignore_status_mask = 0; |
1da177e4 | 2370 | if (termios->c_iflag & IGNPAR) |
dfe42443 | 2371 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
1da177e4 | 2372 | if (termios->c_iflag & IGNBRK) { |
dfe42443 | 2373 | port->ignore_status_mask |= UART_LSR_BI; |
1da177e4 LT |
2374 | /* |
2375 | * If we're ignoring parity and break indicators, | |
2376 | * ignore overruns too (for real raw support). | |
2377 | */ | |
2378 | if (termios->c_iflag & IGNPAR) | |
dfe42443 | 2379 | port->ignore_status_mask |= UART_LSR_OE; |
1da177e4 LT |
2380 | } |
2381 | ||
2382 | /* | |
2383 | * ignore all characters if CREAD is not set | |
2384 | */ | |
2385 | if ((termios->c_cflag & CREAD) == 0) | |
dfe42443 | 2386 | port->ignore_status_mask |= UART_LSR_DR; |
1da177e4 LT |
2387 | |
2388 | /* | |
2389 | * CTS flow control flag and modem status interrupts | |
2390 | */ | |
f8b372a1 | 2391 | up->ier &= ~UART_IER_MSI; |
21c614a7 PA |
2392 | if (!(up->bugs & UART_BUG_NOMSR) && |
2393 | UART_ENABLE_MS(&up->port, termios->c_cflag)) | |
1da177e4 LT |
2394 | up->ier |= UART_IER_MSI; |
2395 | if (up->capabilities & UART_CAP_UUE) | |
4539c24f SW |
2396 | up->ier |= UART_IER_UUE; |
2397 | if (up->capabilities & UART_CAP_RTOIE) | |
2398 | up->ier |= UART_IER_RTOIE; | |
1da177e4 | 2399 | |
4fd996a1 | 2400 | serial_port_out(port, UART_IER, up->ier); |
1da177e4 LT |
2401 | |
2402 | if (up->capabilities & UART_CAP_EFR) { | |
2403 | unsigned char efr = 0; | |
2404 | /* | |
2405 | * TI16C752/Startech hardware flow control. FIXME: | |
2406 | * - TI16C752 requires control thresholds to be set. | |
2407 | * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled. | |
2408 | */ | |
2409 | if (termios->c_cflag & CRTSCTS) | |
2410 | efr |= UART_EFR_CTS; | |
2411 | ||
4fd996a1 | 2412 | serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); |
dfe42443 | 2413 | if (port->flags & UPF_EXAR_EFR) |
4fd996a1 | 2414 | serial_port_out(port, UART_XR_EFR, efr); |
06315348 | 2415 | else |
4fd996a1 | 2416 | serial_port_out(port, UART_EFR, efr); |
1da177e4 LT |
2417 | } |
2418 | ||
255341c6 | 2419 | /* Workaround to enable 115200 baud on OMAP1510 internal ports */ |
54ec52b6 | 2420 | if (is_omap1510_8250(up)) { |
255341c6 JM |
2421 | if (baud == 115200) { |
2422 | quot = 1; | |
4fd996a1 | 2423 | serial_port_out(port, UART_OMAP_OSC_12M_SEL, 1); |
255341c6 | 2424 | } else |
4fd996a1 | 2425 | serial_port_out(port, UART_OMAP_OSC_12M_SEL, 0); |
255341c6 | 2426 | } |
255341c6 | 2427 | |
4fd996a1 PG |
2428 | /* |
2429 | * For NatSemi, switch to bank 2 not bank 1, to avoid resetting EXCR2, | |
2430 | * otherwise just set DLAB | |
2431 | */ | |
2432 | if (up->capabilities & UART_NATSEMI) | |
2433 | serial_port_out(port, UART_LCR, 0xe0); | |
2434 | else | |
2435 | serial_port_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
1da177e4 | 2436 | |
b32b19b8 | 2437 | serial_dl_write(up, quot); |
1da177e4 | 2438 | |
45a7bd63 JS |
2439 | /* |
2440 | * XR17V35x UARTs have an extra fractional divisor register (DLD) | |
2441 | * | |
2442 | * We need to recalculate all of the registers, because DLM and DLL | |
2443 | * are already rounded to a whole integer. | |
2444 | * | |
2445 | * When recalculating we use a 32x clock instead of a 16x clock to | |
2446 | * allow 1-bit for rounding in the fractional part. | |
2447 | */ | |
2448 | if (up->port.type == PORT_XR17V35X) { | |
2449 | unsigned int baud_x32 = (port->uartclk * 2) / baud; | |
2450 | u16 quot = baud_x32 / 32; | |
2451 | u8 quot_frac = DIV_ROUND_CLOSEST(baud_x32 % 32, 2); | |
2452 | ||
2453 | serial_dl_write(up, quot); | |
2454 | serial_port_out(port, 0x2, quot_frac & 0xf); | |
2455 | } | |
2456 | ||
1da177e4 LT |
2457 | /* |
2458 | * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR | |
2459 | * is written without DLAB set, this mode will be disabled. | |
2460 | */ | |
dfe42443 | 2461 | if (port->type == PORT_16750) |
aef9a7bd | 2462 | serial_port_out(port, UART_FCR, up->fcr); |
1da177e4 | 2463 | |
4fd996a1 | 2464 | serial_port_out(port, UART_LCR, cval); /* reset DLAB */ |
1da177e4 | 2465 | up->lcr = cval; /* Save LCR */ |
dfe42443 | 2466 | if (port->type != PORT_16750) { |
4fd996a1 | 2467 | /* emulated UARTs (Lucent Venus 167x) need two steps */ |
aef9a7bd | 2468 | if (up->fcr & UART_FCR_ENABLE_FIFO) |
4fd996a1 | 2469 | serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); |
aef9a7bd | 2470 | serial_port_out(port, UART_FCR, up->fcr); /* set fcr */ |
1da177e4 | 2471 | } |
dfe42443 PG |
2472 | serial8250_set_mctrl(port, port->mctrl); |
2473 | spin_unlock_irqrestore(&port->lock, flags); | |
e991a2bd AC |
2474 | /* Don't rewrite B0 */ |
2475 | if (tty_termios_baud_rate(termios)) | |
2476 | tty_termios_encode_baud_rate(termios, baud, baud); | |
1da177e4 | 2477 | } |
235dae5d PL |
2478 | EXPORT_SYMBOL(serial8250_do_set_termios); |
2479 | ||
2480 | static void | |
2481 | serial8250_set_termios(struct uart_port *port, struct ktermios *termios, | |
2482 | struct ktermios *old) | |
2483 | { | |
2484 | if (port->set_termios) | |
2485 | port->set_termios(port, termios, old); | |
2486 | else | |
2487 | serial8250_do_set_termios(port, termios, old); | |
2488 | } | |
1da177e4 | 2489 | |
dc77f161 | 2490 | static void |
a0821df6 | 2491 | serial8250_set_ldisc(struct uart_port *port, int new) |
dc77f161 | 2492 | { |
a0821df6 | 2493 | if (new == N_PPS) { |
dc77f161 RG |
2494 | port->flags |= UPF_HARDPPS_CD; |
2495 | serial8250_enable_ms(port); | |
2496 | } else | |
2497 | port->flags &= ~UPF_HARDPPS_CD; | |
2498 | } | |
2499 | ||
c161afe9 ML |
2500 | |
2501 | void serial8250_do_pm(struct uart_port *port, unsigned int state, | |
2502 | unsigned int oldstate) | |
1da177e4 | 2503 | { |
b1261c86 | 2504 | struct uart_8250_port *p = up_to_u8250p(port); |
1da177e4 LT |
2505 | |
2506 | serial8250_set_sleep(p, state != 0); | |
c161afe9 ML |
2507 | } |
2508 | EXPORT_SYMBOL(serial8250_do_pm); | |
1da177e4 | 2509 | |
c161afe9 ML |
2510 | static void |
2511 | serial8250_pm(struct uart_port *port, unsigned int state, | |
2512 | unsigned int oldstate) | |
2513 | { | |
2514 | if (port->pm) | |
2515 | port->pm(port, state, oldstate); | |
2516 | else | |
2517 | serial8250_do_pm(port, state, oldstate); | |
1da177e4 LT |
2518 | } |
2519 | ||
f2eda27d RK |
2520 | static unsigned int serial8250_port_size(struct uart_8250_port *pt) |
2521 | { | |
2522 | if (pt->port.iotype == UPIO_AU) | |
b2b13cdf | 2523 | return 0x1000; |
54ec52b6 | 2524 | if (is_omap1_8250(pt)) |
f2eda27d | 2525 | return 0x16 << pt->port.regshift; |
54ec52b6 | 2526 | |
f2eda27d RK |
2527 | return 8 << pt->port.regshift; |
2528 | } | |
2529 | ||
1da177e4 LT |
2530 | /* |
2531 | * Resource handling. | |
2532 | */ | |
2533 | static int serial8250_request_std_resource(struct uart_8250_port *up) | |
2534 | { | |
f2eda27d | 2535 | unsigned int size = serial8250_port_size(up); |
dfe42443 | 2536 | struct uart_port *port = &up->port; |
1da177e4 LT |
2537 | int ret = 0; |
2538 | ||
dfe42443 | 2539 | switch (port->iotype) { |
85835f44 | 2540 | case UPIO_AU: |
0b30d668 SS |
2541 | case UPIO_TSI: |
2542 | case UPIO_MEM32: | |
1da177e4 | 2543 | case UPIO_MEM: |
dfe42443 | 2544 | if (!port->mapbase) |
1da177e4 LT |
2545 | break; |
2546 | ||
dfe42443 | 2547 | if (!request_mem_region(port->mapbase, size, "serial")) { |
1da177e4 LT |
2548 | ret = -EBUSY; |
2549 | break; | |
2550 | } | |
2551 | ||
dfe42443 PG |
2552 | if (port->flags & UPF_IOREMAP) { |
2553 | port->membase = ioremap_nocache(port->mapbase, size); | |
2554 | if (!port->membase) { | |
2555 | release_mem_region(port->mapbase, size); | |
1da177e4 LT |
2556 | ret = -ENOMEM; |
2557 | } | |
2558 | } | |
2559 | break; | |
2560 | ||
2561 | case UPIO_HUB6: | |
2562 | case UPIO_PORT: | |
dfe42443 | 2563 | if (!request_region(port->iobase, size, "serial")) |
1da177e4 LT |
2564 | ret = -EBUSY; |
2565 | break; | |
2566 | } | |
2567 | return ret; | |
2568 | } | |
2569 | ||
2570 | static void serial8250_release_std_resource(struct uart_8250_port *up) | |
2571 | { | |
f2eda27d | 2572 | unsigned int size = serial8250_port_size(up); |
dfe42443 | 2573 | struct uart_port *port = &up->port; |
1da177e4 | 2574 | |
dfe42443 | 2575 | switch (port->iotype) { |
85835f44 | 2576 | case UPIO_AU: |
0b30d668 SS |
2577 | case UPIO_TSI: |
2578 | case UPIO_MEM32: | |
1da177e4 | 2579 | case UPIO_MEM: |
dfe42443 | 2580 | if (!port->mapbase) |
1da177e4 LT |
2581 | break; |
2582 | ||
dfe42443 PG |
2583 | if (port->flags & UPF_IOREMAP) { |
2584 | iounmap(port->membase); | |
2585 | port->membase = NULL; | |
1da177e4 LT |
2586 | } |
2587 | ||
dfe42443 | 2588 | release_mem_region(port->mapbase, size); |
1da177e4 LT |
2589 | break; |
2590 | ||
2591 | case UPIO_HUB6: | |
2592 | case UPIO_PORT: | |
dfe42443 | 2593 | release_region(port->iobase, size); |
1da177e4 LT |
2594 | break; |
2595 | } | |
2596 | } | |
2597 | ||
2598 | static int serial8250_request_rsa_resource(struct uart_8250_port *up) | |
2599 | { | |
2600 | unsigned long start = UART_RSA_BASE << up->port.regshift; | |
2601 | unsigned int size = 8 << up->port.regshift; | |
dfe42443 | 2602 | struct uart_port *port = &up->port; |
0b30d668 | 2603 | int ret = -EINVAL; |
1da177e4 | 2604 | |
dfe42443 | 2605 | switch (port->iotype) { |
1da177e4 LT |
2606 | case UPIO_HUB6: |
2607 | case UPIO_PORT: | |
dfe42443 | 2608 | start += port->iobase; |
0b30d668 SS |
2609 | if (request_region(start, size, "serial-rsa")) |
2610 | ret = 0; | |
2611 | else | |
1da177e4 LT |
2612 | ret = -EBUSY; |
2613 | break; | |
2614 | } | |
2615 | ||
2616 | return ret; | |
2617 | } | |
2618 | ||
2619 | static void serial8250_release_rsa_resource(struct uart_8250_port *up) | |
2620 | { | |
2621 | unsigned long offset = UART_RSA_BASE << up->port.regshift; | |
2622 | unsigned int size = 8 << up->port.regshift; | |
dfe42443 | 2623 | struct uart_port *port = &up->port; |
1da177e4 | 2624 | |
dfe42443 | 2625 | switch (port->iotype) { |
1da177e4 LT |
2626 | case UPIO_HUB6: |
2627 | case UPIO_PORT: | |
dfe42443 | 2628 | release_region(port->iobase + offset, size); |
1da177e4 LT |
2629 | break; |
2630 | } | |
2631 | } | |
2632 | ||
2633 | static void serial8250_release_port(struct uart_port *port) | |
2634 | { | |
b1261c86 | 2635 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 LT |
2636 | |
2637 | serial8250_release_std_resource(up); | |
dfe42443 | 2638 | if (port->type == PORT_RSA) |
1da177e4 LT |
2639 | serial8250_release_rsa_resource(up); |
2640 | } | |
2641 | ||
2642 | static int serial8250_request_port(struct uart_port *port) | |
2643 | { | |
b1261c86 | 2644 | struct uart_8250_port *up = up_to_u8250p(port); |
65ecc9c0 SY |
2645 | int ret; |
2646 | ||
2647 | if (port->type == PORT_8250_CIR) | |
2648 | return -ENODEV; | |
1da177e4 LT |
2649 | |
2650 | ret = serial8250_request_std_resource(up); | |
dfe42443 | 2651 | if (ret == 0 && port->type == PORT_RSA) { |
1da177e4 LT |
2652 | ret = serial8250_request_rsa_resource(up); |
2653 | if (ret < 0) | |
2654 | serial8250_release_std_resource(up); | |
2655 | } | |
2656 | ||
2657 | return ret; | |
2658 | } | |
2659 | ||
aef9a7bd YY |
2660 | static int fcr_get_rxtrig_bytes(struct uart_8250_port *up) |
2661 | { | |
2662 | const struct serial8250_config *conf_type = &uart_config[up->port.type]; | |
2663 | unsigned char bytes; | |
2664 | ||
2665 | bytes = conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(up->fcr)]; | |
2666 | ||
2667 | return bytes ? bytes : -EOPNOTSUPP; | |
2668 | } | |
2669 | ||
2670 | static int bytes_to_fcr_rxtrig(struct uart_8250_port *up, unsigned char bytes) | |
2671 | { | |
2672 | const struct serial8250_config *conf_type = &uart_config[up->port.type]; | |
2673 | int i; | |
2674 | ||
2675 | if (!conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(UART_FCR_R_TRIG_00)]) | |
2676 | return -EOPNOTSUPP; | |
2677 | ||
2678 | for (i = 1; i < UART_FCR_R_TRIG_MAX_STATE; i++) { | |
2679 | if (bytes < conf_type->rxtrig_bytes[i]) | |
2680 | /* Use the nearest lower value */ | |
2681 | return (--i) << UART_FCR_R_TRIG_SHIFT; | |
2682 | } | |
2683 | ||
2684 | return UART_FCR_R_TRIG_11; | |
2685 | } | |
2686 | ||
2687 | static int do_get_rxtrig(struct tty_port *port) | |
2688 | { | |
2689 | struct uart_state *state = container_of(port, struct uart_state, port); | |
2690 | struct uart_port *uport = state->uart_port; | |
2691 | struct uart_8250_port *up = | |
2692 | container_of(uport, struct uart_8250_port, port); | |
2693 | ||
2694 | if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1) | |
2695 | return -EINVAL; | |
2696 | ||
2697 | return fcr_get_rxtrig_bytes(up); | |
2698 | } | |
2699 | ||
2700 | static int do_serial8250_get_rxtrig(struct tty_port *port) | |
2701 | { | |
2702 | int rxtrig_bytes; | |
2703 | ||
2704 | mutex_lock(&port->mutex); | |
2705 | rxtrig_bytes = do_get_rxtrig(port); | |
2706 | mutex_unlock(&port->mutex); | |
2707 | ||
2708 | return rxtrig_bytes; | |
2709 | } | |
2710 | ||
2711 | static ssize_t serial8250_get_attr_rx_trig_bytes(struct device *dev, | |
2712 | struct device_attribute *attr, char *buf) | |
2713 | { | |
2714 | struct tty_port *port = dev_get_drvdata(dev); | |
2715 | int rxtrig_bytes; | |
2716 | ||
2717 | rxtrig_bytes = do_serial8250_get_rxtrig(port); | |
2718 | if (rxtrig_bytes < 0) | |
2719 | return rxtrig_bytes; | |
2720 | ||
2721 | return snprintf(buf, PAGE_SIZE, "%d\n", rxtrig_bytes); | |
2722 | } | |
2723 | ||
2724 | static int do_set_rxtrig(struct tty_port *port, unsigned char bytes) | |
2725 | { | |
2726 | struct uart_state *state = container_of(port, struct uart_state, port); | |
2727 | struct uart_port *uport = state->uart_port; | |
2728 | struct uart_8250_port *up = | |
2729 | container_of(uport, struct uart_8250_port, port); | |
2730 | int rxtrig; | |
2731 | ||
2732 | if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1 || | |
2733 | up->fifo_bug) | |
2734 | return -EINVAL; | |
2735 | ||
2736 | rxtrig = bytes_to_fcr_rxtrig(up, bytes); | |
2737 | if (rxtrig < 0) | |
2738 | return rxtrig; | |
2739 | ||
2740 | serial8250_clear_fifos(up); | |
2741 | up->fcr &= ~UART_FCR_TRIGGER_MASK; | |
2742 | up->fcr |= (unsigned char)rxtrig; | |
2743 | serial_out(up, UART_FCR, up->fcr); | |
2744 | return 0; | |
2745 | } | |
2746 | ||
2747 | static int do_serial8250_set_rxtrig(struct tty_port *port, unsigned char bytes) | |
2748 | { | |
2749 | int ret; | |
2750 | ||
2751 | mutex_lock(&port->mutex); | |
2752 | ret = do_set_rxtrig(port, bytes); | |
2753 | mutex_unlock(&port->mutex); | |
2754 | ||
2755 | return ret; | |
2756 | } | |
2757 | ||
2758 | static ssize_t serial8250_set_attr_rx_trig_bytes(struct device *dev, | |
2759 | struct device_attribute *attr, const char *buf, size_t count) | |
2760 | { | |
2761 | struct tty_port *port = dev_get_drvdata(dev); | |
2762 | unsigned char bytes; | |
2763 | int ret; | |
2764 | ||
2765 | if (!count) | |
2766 | return -EINVAL; | |
2767 | ||
2768 | ret = kstrtou8(buf, 10, &bytes); | |
2769 | if (ret < 0) | |
2770 | return ret; | |
2771 | ||
2772 | ret = do_serial8250_set_rxtrig(port, bytes); | |
2773 | if (ret < 0) | |
2774 | return ret; | |
2775 | ||
2776 | return count; | |
2777 | } | |
2778 | ||
2779 | static DEVICE_ATTR(rx_trig_bytes, S_IRUSR | S_IWUSR | S_IRGRP, | |
2780 | serial8250_get_attr_rx_trig_bytes, | |
2781 | serial8250_set_attr_rx_trig_bytes); | |
2782 | ||
2783 | static struct attribute *serial8250_dev_attrs[] = { | |
2784 | &dev_attr_rx_trig_bytes.attr, | |
2785 | NULL, | |
2786 | }; | |
2787 | ||
2788 | static struct attribute_group serial8250_dev_attr_group = { | |
2789 | .attrs = serial8250_dev_attrs, | |
2790 | }; | |
2791 | ||
2792 | static void register_dev_spec_attr_grp(struct uart_8250_port *up) | |
2793 | { | |
2794 | const struct serial8250_config *conf_type = &uart_config[up->port.type]; | |
2795 | ||
2796 | if (conf_type->rxtrig_bytes[0]) | |
2797 | up->port.attr_group = &serial8250_dev_attr_group; | |
2798 | } | |
2799 | ||
1da177e4 LT |
2800 | static void serial8250_config_port(struct uart_port *port, int flags) |
2801 | { | |
b1261c86 | 2802 | struct uart_8250_port *up = up_to_u8250p(port); |
1da177e4 LT |
2803 | int probeflags = PROBE_ANY; |
2804 | int ret; | |
2805 | ||
65ecc9c0 SY |
2806 | if (port->type == PORT_8250_CIR) |
2807 | return; | |
2808 | ||
1da177e4 LT |
2809 | /* |
2810 | * Find the region that we can probe for. This in turn | |
2811 | * tells us whether we can probe for the type of port. | |
2812 | */ | |
2813 | ret = serial8250_request_std_resource(up); | |
2814 | if (ret < 0) | |
2815 | return; | |
2816 | ||
2817 | ret = serial8250_request_rsa_resource(up); | |
2818 | if (ret < 0) | |
2819 | probeflags &= ~PROBE_RSA; | |
2820 | ||
dfe42443 | 2821 | if (port->iotype != up->cur_iotype) |
b8e7e40a AC |
2822 | set_io_from_upio(port); |
2823 | ||
1da177e4 LT |
2824 | if (flags & UART_CONFIG_TYPE) |
2825 | autoconfig(up, probeflags); | |
b2b13cdf | 2826 | |
b2b13cdf | 2827 | /* if access method is AU, it is a 16550 with a quirk */ |
dfe42443 | 2828 | if (port->type == PORT_16550A && port->iotype == UPIO_AU) |
b2b13cdf | 2829 | up->bugs |= UART_BUG_NOMSR; |
b2b13cdf | 2830 | |
3685f19e SW |
2831 | /* HW bugs may trigger IRQ while IIR == NO_INT */ |
2832 | if (port->type == PORT_TEGRA) | |
2833 | up->bugs |= UART_BUG_NOMSR; | |
2834 | ||
dfe42443 | 2835 | if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) |
1da177e4 LT |
2836 | autoconfig_irq(up); |
2837 | ||
dfe42443 | 2838 | if (port->type != PORT_RSA && probeflags & PROBE_RSA) |
1da177e4 | 2839 | serial8250_release_rsa_resource(up); |
dfe42443 | 2840 | if (port->type == PORT_UNKNOWN) |
1da177e4 | 2841 | serial8250_release_std_resource(up); |
dc96efb7 MS |
2842 | |
2843 | /* Fixme: probably not the best place for this */ | |
30fa96a3 MS |
2844 | if ((port->type == PORT_XR17V35X) || |
2845 | (port->type == PORT_XR17D15X)) | |
dc96efb7 | 2846 | port->handle_irq = exar_handle_irq; |
aef9a7bd YY |
2847 | |
2848 | register_dev_spec_attr_grp(up); | |
2849 | up->fcr = uart_config[up->port.type].fcr; | |
1da177e4 LT |
2850 | } |
2851 | ||
2852 | static int | |
2853 | serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) | |
2854 | { | |
a62c4133 | 2855 | if (ser->irq >= nr_irqs || ser->irq < 0 || |
1da177e4 LT |
2856 | ser->baud_base < 9600 || ser->type < PORT_UNKNOWN || |
2857 | ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS || | |
2858 | ser->type == PORT_STARTECH) | |
2859 | return -EINVAL; | |
2860 | return 0; | |
2861 | } | |
2862 | ||
e676253b RRD |
2863 | static int serial8250_ioctl(struct uart_port *port, unsigned int cmd, |
2864 | unsigned long arg) | |
2865 | { | |
2866 | struct uart_8250_port *up = | |
2867 | container_of(port, struct uart_8250_port, port); | |
2868 | int ret; | |
2869 | struct serial_rs485 rs485_config; | |
2870 | ||
2871 | if (!up->rs485_config) | |
2872 | return -ENOIOCTLCMD; | |
2873 | ||
2874 | switch (cmd) { | |
2875 | case TIOCSRS485: | |
2876 | if (copy_from_user(&rs485_config, (void __user *)arg, | |
2877 | sizeof(rs485_config))) | |
2878 | return -EFAULT; | |
2879 | ||
2880 | ret = up->rs485_config(up, &rs485_config); | |
2881 | if (ret) | |
2882 | return ret; | |
2883 | ||
2884 | memcpy(&up->rs485, &rs485_config, sizeof(rs485_config)); | |
2885 | ||
2886 | return 0; | |
2887 | case TIOCGRS485: | |
2888 | if (copy_to_user((void __user *)arg, &up->rs485, | |
2889 | sizeof(up->rs485))) | |
2890 | return -EFAULT; | |
2891 | return 0; | |
2892 | default: | |
2893 | break; | |
2894 | } | |
2895 | ||
2896 | return -ENOIOCTLCMD; | |
2897 | } | |
2898 | ||
1da177e4 LT |
2899 | static const char * |
2900 | serial8250_type(struct uart_port *port) | |
2901 | { | |
2902 | int type = port->type; | |
2903 | ||
2904 | if (type >= ARRAY_SIZE(uart_config)) | |
2905 | type = 0; | |
2906 | return uart_config[type].name; | |
2907 | } | |
2908 | ||
2909 | static struct uart_ops serial8250_pops = { | |
2910 | .tx_empty = serial8250_tx_empty, | |
2911 | .set_mctrl = serial8250_set_mctrl, | |
2912 | .get_mctrl = serial8250_get_mctrl, | |
2913 | .stop_tx = serial8250_stop_tx, | |
2914 | .start_tx = serial8250_start_tx, | |
2915 | .stop_rx = serial8250_stop_rx, | |
2916 | .enable_ms = serial8250_enable_ms, | |
2917 | .break_ctl = serial8250_break_ctl, | |
2918 | .startup = serial8250_startup, | |
2919 | .shutdown = serial8250_shutdown, | |
2920 | .set_termios = serial8250_set_termios, | |
dc77f161 | 2921 | .set_ldisc = serial8250_set_ldisc, |
1da177e4 LT |
2922 | .pm = serial8250_pm, |
2923 | .type = serial8250_type, | |
2924 | .release_port = serial8250_release_port, | |
2925 | .request_port = serial8250_request_port, | |
2926 | .config_port = serial8250_config_port, | |
2927 | .verify_port = serial8250_verify_port, | |
e676253b | 2928 | .ioctl = serial8250_ioctl, |
f2d937f3 JW |
2929 | #ifdef CONFIG_CONSOLE_POLL |
2930 | .poll_get_char = serial8250_get_poll_char, | |
2931 | .poll_put_char = serial8250_put_poll_char, | |
2932 | #endif | |
1da177e4 LT |
2933 | }; |
2934 | ||
2935 | static struct uart_8250_port serial8250_ports[UART_NR]; | |
2936 | ||
ae14a795 SAS |
2937 | /** |
2938 | * serial8250_get_port - retrieve struct uart_8250_port | |
2939 | * @line: serial line number | |
2940 | * | |
2941 | * This function retrieves struct uart_8250_port for the specific line. | |
2942 | * This struct *must* *not* be used to perform a 8250 or serial core operation | |
2943 | * which is not accessible otherwise. Its only purpose is to make the struct | |
2944 | * accessible to the runtime-pm callbacks for context suspend/restore. | |
2945 | * The lock assumption made here is none because runtime-pm suspend/resume | |
2946 | * callbacks should not be invoked if there is any operation performed on the | |
2947 | * port. | |
2948 | */ | |
2949 | struct uart_8250_port *serial8250_get_port(int line) | |
2950 | { | |
2951 | return &serial8250_ports[line]; | |
2952 | } | |
2953 | EXPORT_SYMBOL_GPL(serial8250_get_port); | |
2954 | ||
af7f3743 AC |
2955 | static void (*serial8250_isa_config)(int port, struct uart_port *up, |
2956 | unsigned short *capabilities); | |
2957 | ||
2958 | void serial8250_set_isa_configurator( | |
2959 | void (*v)(int port, struct uart_port *up, unsigned short *capabilities)) | |
2960 | { | |
2961 | serial8250_isa_config = v; | |
2962 | } | |
2963 | EXPORT_SYMBOL(serial8250_set_isa_configurator); | |
2964 | ||
1da177e4 LT |
2965 | static void __init serial8250_isa_init_ports(void) |
2966 | { | |
2967 | struct uart_8250_port *up; | |
2968 | static int first = 1; | |
4c0ebb80 | 2969 | int i, irqflag = 0; |
1da177e4 LT |
2970 | |
2971 | if (!first) | |
2972 | return; | |
2973 | first = 0; | |
2974 | ||
835d844d SY |
2975 | if (nr_uarts > UART_NR) |
2976 | nr_uarts = UART_NR; | |
2977 | ||
317a6842 | 2978 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 | 2979 | struct uart_8250_port *up = &serial8250_ports[i]; |
dfe42443 | 2980 | struct uart_port *port = &up->port; |
1da177e4 | 2981 | |
dfe42443 PG |
2982 | port->line = i; |
2983 | spin_lock_init(&port->lock); | |
1da177e4 LT |
2984 | |
2985 | init_timer(&up->timer); | |
2986 | up->timer.function = serial8250_timeout; | |
835d844d | 2987 | up->cur_iotype = 0xFF; |
1da177e4 LT |
2988 | |
2989 | /* | |
2990 | * ALPHA_KLUDGE_MCR needs to be killed. | |
2991 | */ | |
2992 | up->mcr_mask = ~ALPHA_KLUDGE_MCR; | |
2993 | up->mcr_force = ALPHA_KLUDGE_MCR; | |
2994 | ||
dfe42443 | 2995 | port->ops = &serial8250_pops; |
1da177e4 LT |
2996 | } |
2997 | ||
4c0ebb80 AGR |
2998 | if (share_irqs) |
2999 | irqflag = IRQF_SHARED; | |
3000 | ||
44454bcd | 3001 | for (i = 0, up = serial8250_ports; |
a61c2d78 | 3002 | i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; |
1da177e4 | 3003 | i++, up++) { |
dfe42443 PG |
3004 | struct uart_port *port = &up->port; |
3005 | ||
3006 | port->iobase = old_serial_port[i].port; | |
3007 | port->irq = irq_canonicalize(old_serial_port[i].irq); | |
3008 | port->irqflags = old_serial_port[i].irqflags; | |
3009 | port->uartclk = old_serial_port[i].baud_base * 16; | |
3010 | port->flags = old_serial_port[i].flags; | |
3011 | port->hub6 = old_serial_port[i].hub6; | |
3012 | port->membase = old_serial_port[i].iomem_base; | |
3013 | port->iotype = old_serial_port[i].io_type; | |
3014 | port->regshift = old_serial_port[i].iomem_reg_shift; | |
3015 | set_io_from_upio(port); | |
3016 | port->irqflags |= irqflag; | |
af7f3743 AC |
3017 | if (serial8250_isa_config != NULL) |
3018 | serial8250_isa_config(i, &up->port, &up->capabilities); | |
3019 | ||
1da177e4 LT |
3020 | } |
3021 | } | |
3022 | ||
b5d228cc SL |
3023 | static void |
3024 | serial8250_init_fixed_type_port(struct uart_8250_port *up, unsigned int type) | |
3025 | { | |
3026 | up->port.type = type; | |
9660497c HK |
3027 | if (!up->port.fifosize) |
3028 | up->port.fifosize = uart_config[type].fifo_size; | |
3029 | if (!up->tx_loadsz) | |
3030 | up->tx_loadsz = uart_config[type].tx_loadsz; | |
3031 | if (!up->capabilities) | |
3032 | up->capabilities = uart_config[type].flags; | |
b5d228cc SL |
3033 | } |
3034 | ||
1da177e4 LT |
3035 | static void __init |
3036 | serial8250_register_ports(struct uart_driver *drv, struct device *dev) | |
3037 | { | |
3038 | int i; | |
3039 | ||
b8e7e40a AC |
3040 | for (i = 0; i < nr_uarts; i++) { |
3041 | struct uart_8250_port *up = &serial8250_ports[i]; | |
b8e7e40a | 3042 | |
835d844d SY |
3043 | if (up->port.dev) |
3044 | continue; | |
1da177e4 LT |
3045 | |
3046 | up->port.dev = dev; | |
b5d228cc SL |
3047 | |
3048 | if (up->port.flags & UPF_FIXED_TYPE) | |
3049 | serial8250_init_fixed_type_port(up, up->port.type); | |
3050 | ||
1da177e4 LT |
3051 | uart_add_one_port(drv, &up->port); |
3052 | } | |
3053 | } | |
3054 | ||
3055 | #ifdef CONFIG_SERIAL_8250_CONSOLE | |
3056 | ||
d358788f RK |
3057 | static void serial8250_console_putchar(struct uart_port *port, int ch) |
3058 | { | |
b1261c86 | 3059 | struct uart_8250_port *up = up_to_u8250p(port); |
d358788f RK |
3060 | |
3061 | wait_for_xmitr(up, UART_LSR_THRE); | |
4fd996a1 | 3062 | serial_port_out(port, UART_TX, ch); |
d358788f RK |
3063 | } |
3064 | ||
1da177e4 LT |
3065 | /* |
3066 | * Print a string to the serial port trying not to disturb | |
3067 | * any possible real use of the port... | |
3068 | * | |
3069 | * The console_lock must be held when we get here. | |
3070 | */ | |
3071 | static void | |
3072 | serial8250_console_write(struct console *co, const char *s, unsigned int count) | |
3073 | { | |
3074 | struct uart_8250_port *up = &serial8250_ports[co->index]; | |
dfe42443 | 3075 | struct uart_port *port = &up->port; |
d8a5a8d7 | 3076 | unsigned long flags; |
1da177e4 | 3077 | unsigned int ier; |
d8a5a8d7 | 3078 | int locked = 1; |
1da177e4 | 3079 | |
78512ece AM |
3080 | touch_nmi_watchdog(); |
3081 | ||
ebade5e8 IM |
3082 | if (port->sysrq || oops_in_progress) |
3083 | locked = spin_trylock_irqsave(&port->lock, flags); | |
3084 | else | |
3085 | spin_lock_irqsave(&port->lock, flags); | |
d8a5a8d7 | 3086 | |
1da177e4 | 3087 | /* |
dc7bf130 | 3088 | * First save the IER then disable the interrupts |
1da177e4 | 3089 | */ |
4fd996a1 | 3090 | ier = serial_port_in(port, UART_IER); |
1da177e4 LT |
3091 | |
3092 | if (up->capabilities & UART_CAP_UUE) | |
4fd996a1 | 3093 | serial_port_out(port, UART_IER, UART_IER_UUE); |
1da177e4 | 3094 | else |
4fd996a1 | 3095 | serial_port_out(port, UART_IER, 0); |
1da177e4 | 3096 | |
dfe42443 | 3097 | uart_console_write(port, s, count, serial8250_console_putchar); |
1da177e4 LT |
3098 | |
3099 | /* | |
3100 | * Finally, wait for transmitter to become empty | |
3101 | * and restore the IER | |
3102 | */ | |
f91a3715 | 3103 | wait_for_xmitr(up, BOTH_EMPTY); |
4fd996a1 | 3104 | serial_port_out(port, UART_IER, ier); |
d8a5a8d7 | 3105 | |
ad4c2aa6 CM |
3106 | /* |
3107 | * The receive handling will happen properly because the | |
3108 | * receive ready bit will still be set; it is not cleared | |
3109 | * on read. However, modem control will not, we must | |
3110 | * call it if we have saved something in the saved flags | |
3111 | * while processing with interrupts off. | |
3112 | */ | |
3113 | if (up->msr_saved_flags) | |
3986fb2b | 3114 | serial8250_modem_status(up); |
ad4c2aa6 | 3115 | |
d8a5a8d7 | 3116 | if (locked) |
ebade5e8 | 3117 | spin_unlock_irqrestore(&port->lock, flags); |
1da177e4 LT |
3118 | } |
3119 | ||
118c0ace | 3120 | static int __init serial8250_console_setup(struct console *co, char *options) |
1da177e4 LT |
3121 | { |
3122 | struct uart_port *port; | |
3123 | int baud = 9600; | |
3124 | int bits = 8; | |
3125 | int parity = 'n'; | |
3126 | int flow = 'n'; | |
3127 | ||
3128 | /* | |
3129 | * Check whether an invalid uart number has been specified, and | |
3130 | * if so, search for the first available port that does have | |
3131 | * console support. | |
3132 | */ | |
317a6842 | 3133 | if (co->index >= nr_uarts) |
1da177e4 LT |
3134 | co->index = 0; |
3135 | port = &serial8250_ports[co->index].port; | |
3136 | if (!port->iobase && !port->membase) | |
3137 | return -ENODEV; | |
3138 | ||
3139 | if (options) | |
3140 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
3141 | ||
3142 | return uart_set_options(port, co, baud, parity, bits, flow); | |
3143 | } | |
3144 | ||
b6b1d877 | 3145 | static int serial8250_console_early_setup(void) |
18a8bd94 YL |
3146 | { |
3147 | return serial8250_find_port_for_earlycon(); | |
3148 | } | |
3149 | ||
1da177e4 LT |
3150 | static struct console serial8250_console = { |
3151 | .name = "ttyS", | |
3152 | .write = serial8250_console_write, | |
3153 | .device = uart_console_device, | |
3154 | .setup = serial8250_console_setup, | |
18a8bd94 | 3155 | .early_setup = serial8250_console_early_setup, |
a80c49db | 3156 | .flags = CON_PRINTBUFFER | CON_ANYTIME, |
1da177e4 LT |
3157 | .index = -1, |
3158 | .data = &serial8250_reg, | |
3159 | }; | |
3160 | ||
3161 | static int __init serial8250_console_init(void) | |
3162 | { | |
3163 | serial8250_isa_init_ports(); | |
3164 | register_console(&serial8250_console); | |
3165 | return 0; | |
3166 | } | |
3167 | console_initcall(serial8250_console_init); | |
3168 | ||
18a8bd94 | 3169 | int serial8250_find_port(struct uart_port *p) |
1da177e4 LT |
3170 | { |
3171 | int line; | |
3172 | struct uart_port *port; | |
3173 | ||
317a6842 | 3174 | for (line = 0; line < nr_uarts; line++) { |
1da177e4 | 3175 | port = &serial8250_ports[line].port; |
50aec3b5 | 3176 | if (uart_match_port(p, port)) |
1da177e4 LT |
3177 | return line; |
3178 | } | |
3179 | return -ENODEV; | |
3180 | } | |
3181 | ||
1da177e4 LT |
3182 | #define SERIAL8250_CONSOLE &serial8250_console |
3183 | #else | |
3184 | #define SERIAL8250_CONSOLE NULL | |
3185 | #endif | |
3186 | ||
3187 | static struct uart_driver serial8250_reg = { | |
3188 | .owner = THIS_MODULE, | |
3189 | .driver_name = "serial", | |
1da177e4 LT |
3190 | .dev_name = "ttyS", |
3191 | .major = TTY_MAJOR, | |
3192 | .minor = 64, | |
1da177e4 LT |
3193 | .cons = SERIAL8250_CONSOLE, |
3194 | }; | |
3195 | ||
d856c666 RK |
3196 | /* |
3197 | * early_serial_setup - early registration for 8250 ports | |
3198 | * | |
3199 | * Setup an 8250 port structure prior to console initialisation. Use | |
3200 | * after console initialisation will cause undefined behaviour. | |
3201 | */ | |
1da177e4 LT |
3202 | int __init early_serial_setup(struct uart_port *port) |
3203 | { | |
b430428a DD |
3204 | struct uart_port *p; |
3205 | ||
1da177e4 LT |
3206 | if (port->line >= ARRAY_SIZE(serial8250_ports)) |
3207 | return -ENODEV; | |
3208 | ||
3209 | serial8250_isa_init_ports(); | |
b430428a DD |
3210 | p = &serial8250_ports[port->line].port; |
3211 | p->iobase = port->iobase; | |
3212 | p->membase = port->membase; | |
3213 | p->irq = port->irq; | |
1c2f0493 | 3214 | p->irqflags = port->irqflags; |
b430428a DD |
3215 | p->uartclk = port->uartclk; |
3216 | p->fifosize = port->fifosize; | |
3217 | p->regshift = port->regshift; | |
3218 | p->iotype = port->iotype; | |
3219 | p->flags = port->flags; | |
3220 | p->mapbase = port->mapbase; | |
3221 | p->private_data = port->private_data; | |
125c97d8 HD |
3222 | p->type = port->type; |
3223 | p->line = port->line; | |
7d6a07d1 DD |
3224 | |
3225 | set_io_from_upio(p); | |
3226 | if (port->serial_in) | |
3227 | p->serial_in = port->serial_in; | |
3228 | if (port->serial_out) | |
3229 | p->serial_out = port->serial_out; | |
583d28e9 JI |
3230 | if (port->handle_irq) |
3231 | p->handle_irq = port->handle_irq; | |
3232 | else | |
3233 | p->handle_irq = serial8250_default_handle_irq; | |
7d6a07d1 | 3234 | |
1da177e4 LT |
3235 | return 0; |
3236 | } | |
3237 | ||
3238 | /** | |
3239 | * serial8250_suspend_port - suspend one serial port | |
3240 | * @line: serial line number | |
1da177e4 LT |
3241 | * |
3242 | * Suspend one serial port. | |
3243 | */ | |
3244 | void serial8250_suspend_port(int line) | |
3245 | { | |
3246 | uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port); | |
3247 | } | |
3248 | ||
3249 | /** | |
3250 | * serial8250_resume_port - resume one serial port | |
3251 | * @line: serial line number | |
1da177e4 LT |
3252 | * |
3253 | * Resume one serial port. | |
3254 | */ | |
3255 | void serial8250_resume_port(int line) | |
3256 | { | |
b5b82df6 | 3257 | struct uart_8250_port *up = &serial8250_ports[line]; |
dfe42443 | 3258 | struct uart_port *port = &up->port; |
b5b82df6 DW |
3259 | |
3260 | if (up->capabilities & UART_NATSEMI) { | |
b5b82df6 | 3261 | /* Ensure it's still in high speed mode */ |
4fd996a1 | 3262 | serial_port_out(port, UART_LCR, 0xE0); |
b5b82df6 | 3263 | |
0d0389e5 | 3264 | ns16550a_goto_highspeed(up); |
b5b82df6 | 3265 | |
4fd996a1 | 3266 | serial_port_out(port, UART_LCR, 0); |
dfe42443 | 3267 | port->uartclk = 921600*16; |
b5b82df6 | 3268 | } |
dfe42443 | 3269 | uart_resume_port(&serial8250_reg, port); |
1da177e4 LT |
3270 | } |
3271 | ||
3272 | /* | |
3273 | * Register a set of serial devices attached to a platform device. The | |
3274 | * list is terminated with a zero flags entry, which means we expect | |
3275 | * all entries to have at least UPF_BOOT_AUTOCONF set. | |
3276 | */ | |
9671f099 | 3277 | static int serial8250_probe(struct platform_device *dev) |
1da177e4 | 3278 | { |
574de559 | 3279 | struct plat_serial8250_port *p = dev_get_platdata(&dev->dev); |
2655a2c7 | 3280 | struct uart_8250_port uart; |
4c0ebb80 | 3281 | int ret, i, irqflag = 0; |
1da177e4 | 3282 | |
2655a2c7 | 3283 | memset(&uart, 0, sizeof(uart)); |
1da177e4 | 3284 | |
4c0ebb80 AGR |
3285 | if (share_irqs) |
3286 | irqflag = IRQF_SHARED; | |
3287 | ||
ec9f47cd | 3288 | for (i = 0; p && p->flags != 0; p++, i++) { |
2655a2c7 AC |
3289 | uart.port.iobase = p->iobase; |
3290 | uart.port.membase = p->membase; | |
3291 | uart.port.irq = p->irq; | |
3292 | uart.port.irqflags = p->irqflags; | |
3293 | uart.port.uartclk = p->uartclk; | |
3294 | uart.port.regshift = p->regshift; | |
3295 | uart.port.iotype = p->iotype; | |
3296 | uart.port.flags = p->flags; | |
3297 | uart.port.mapbase = p->mapbase; | |
3298 | uart.port.hub6 = p->hub6; | |
3299 | uart.port.private_data = p->private_data; | |
3300 | uart.port.type = p->type; | |
3301 | uart.port.serial_in = p->serial_in; | |
3302 | uart.port.serial_out = p->serial_out; | |
3303 | uart.port.handle_irq = p->handle_irq; | |
3304 | uart.port.handle_break = p->handle_break; | |
3305 | uart.port.set_termios = p->set_termios; | |
3306 | uart.port.pm = p->pm; | |
3307 | uart.port.dev = &dev->dev; | |
3308 | uart.port.irqflags |= irqflag; | |
3309 | ret = serial8250_register_8250_port(&uart); | |
ec9f47cd | 3310 | if (ret < 0) { |
3ae5eaec | 3311 | dev_err(&dev->dev, "unable to register port at index %d " |
4f640efb JB |
3312 | "(IO%lx MEM%llx IRQ%d): %d\n", i, |
3313 | p->iobase, (unsigned long long)p->mapbase, | |
3314 | p->irq, ret); | |
ec9f47cd | 3315 | } |
1da177e4 LT |
3316 | } |
3317 | return 0; | |
3318 | } | |
3319 | ||
3320 | /* | |
3321 | * Remove serial ports registered against a platform device. | |
3322 | */ | |
ae8d8a14 | 3323 | static int serial8250_remove(struct platform_device *dev) |
1da177e4 LT |
3324 | { |
3325 | int i; | |
3326 | ||
317a6842 | 3327 | for (i = 0; i < nr_uarts; i++) { |
1da177e4 LT |
3328 | struct uart_8250_port *up = &serial8250_ports[i]; |
3329 | ||
3ae5eaec | 3330 | if (up->port.dev == &dev->dev) |
1da177e4 LT |
3331 | serial8250_unregister_port(i); |
3332 | } | |
3333 | return 0; | |
3334 | } | |
3335 | ||
3ae5eaec | 3336 | static int serial8250_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 LT |
3337 | { |
3338 | int i; | |
3339 | ||
1da177e4 LT |
3340 | for (i = 0; i < UART_NR; i++) { |
3341 | struct uart_8250_port *up = &serial8250_ports[i]; | |
3342 | ||
3ae5eaec | 3343 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
1da177e4 LT |
3344 | uart_suspend_port(&serial8250_reg, &up->port); |
3345 | } | |
3346 | ||
3347 | return 0; | |
3348 | } | |
3349 | ||
3ae5eaec | 3350 | static int serial8250_resume(struct platform_device *dev) |
1da177e4 LT |
3351 | { |
3352 | int i; | |
3353 | ||
1da177e4 LT |
3354 | for (i = 0; i < UART_NR; i++) { |
3355 | struct uart_8250_port *up = &serial8250_ports[i]; | |
3356 | ||
3ae5eaec | 3357 | if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev) |
b5b82df6 | 3358 | serial8250_resume_port(i); |
1da177e4 LT |
3359 | } |
3360 | ||
3361 | return 0; | |
3362 | } | |
3363 | ||
3ae5eaec | 3364 | static struct platform_driver serial8250_isa_driver = { |
1da177e4 | 3365 | .probe = serial8250_probe, |
2d47b716 | 3366 | .remove = serial8250_remove, |
1da177e4 LT |
3367 | .suspend = serial8250_suspend, |
3368 | .resume = serial8250_resume, | |
3ae5eaec RK |
3369 | .driver = { |
3370 | .name = "serial8250", | |
7493a314 | 3371 | .owner = THIS_MODULE, |
3ae5eaec | 3372 | }, |
1da177e4 LT |
3373 | }; |
3374 | ||
3375 | /* | |
3376 | * This "device" covers _all_ ISA 8250-compatible serial devices listed | |
3377 | * in the table in include/asm/serial.h | |
3378 | */ | |
3379 | static struct platform_device *serial8250_isa_devs; | |
3380 | ||
3381 | /* | |
2655a2c7 | 3382 | * serial8250_register_8250_port and serial8250_unregister_port allows for |
1da177e4 LT |
3383 | * 16x50 serial ports to be configured at run-time, to support PCMCIA |
3384 | * modems and PCI multiport cards. | |
3385 | */ | |
f392ecfa | 3386 | static DEFINE_MUTEX(serial_mutex); |
1da177e4 LT |
3387 | |
3388 | static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port) | |
3389 | { | |
3390 | int i; | |
3391 | ||
3392 | /* | |
3393 | * First, find a port entry which matches. | |
3394 | */ | |
317a6842 | 3395 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
3396 | if (uart_match_port(&serial8250_ports[i].port, port)) |
3397 | return &serial8250_ports[i]; | |
3398 | ||
3399 | /* | |
3400 | * We didn't find a matching entry, so look for the first | |
3401 | * free entry. We look for one which hasn't been previously | |
3402 | * used (indicated by zero iobase). | |
3403 | */ | |
317a6842 | 3404 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
3405 | if (serial8250_ports[i].port.type == PORT_UNKNOWN && |
3406 | serial8250_ports[i].port.iobase == 0) | |
3407 | return &serial8250_ports[i]; | |
3408 | ||
3409 | /* | |
3410 | * That also failed. Last resort is to find any entry which | |
3411 | * doesn't have a real port associated with it. | |
3412 | */ | |
317a6842 | 3413 | for (i = 0; i < nr_uarts; i++) |
1da177e4 LT |
3414 | if (serial8250_ports[i].port.type == PORT_UNKNOWN) |
3415 | return &serial8250_ports[i]; | |
3416 | ||
3417 | return NULL; | |
3418 | } | |
3419 | ||
3420 | /** | |
f73fa05b | 3421 | * serial8250_register_8250_port - register a serial port |
58bcd332 | 3422 | * @up: serial port template |
1da177e4 LT |
3423 | * |
3424 | * Configure the serial port specified by the request. If the | |
3425 | * port exists and is in use, it is hung up and unregistered | |
3426 | * first. | |
3427 | * | |
3428 | * The port is then probed and if necessary the IRQ is autodetected | |
3429 | * If this fails an error is returned. | |
3430 | * | |
3431 | * On success the port is ready to use and the line number is returned. | |
3432 | */ | |
f73fa05b | 3433 | int serial8250_register_8250_port(struct uart_8250_port *up) |
1da177e4 LT |
3434 | { |
3435 | struct uart_8250_port *uart; | |
3436 | int ret = -ENOSPC; | |
3437 | ||
f73fa05b | 3438 | if (up->port.uartclk == 0) |
1da177e4 LT |
3439 | return -EINVAL; |
3440 | ||
f392ecfa | 3441 | mutex_lock(&serial_mutex); |
1da177e4 | 3442 | |
f73fa05b | 3443 | uart = serial8250_find_match_or_unused(&up->port); |
65ecc9c0 | 3444 | if (uart && uart->port.type != PORT_8250_CIR) { |
835d844d SY |
3445 | if (uart->port.dev) |
3446 | uart_remove_one_port(&serial8250_reg, &uart->port); | |
1da177e4 | 3447 | |
f73fa05b MD |
3448 | uart->port.iobase = up->port.iobase; |
3449 | uart->port.membase = up->port.membase; | |
3450 | uart->port.irq = up->port.irq; | |
3451 | uart->port.irqflags = up->port.irqflags; | |
3452 | uart->port.uartclk = up->port.uartclk; | |
3453 | uart->port.fifosize = up->port.fifosize; | |
3454 | uart->port.regshift = up->port.regshift; | |
3455 | uart->port.iotype = up->port.iotype; | |
3456 | uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; | |
a2d33d87 | 3457 | uart->bugs = up->bugs; |
f73fa05b MD |
3458 | uart->port.mapbase = up->port.mapbase; |
3459 | uart->port.private_data = up->port.private_data; | |
9660497c HK |
3460 | uart->port.fifosize = up->port.fifosize; |
3461 | uart->tx_loadsz = up->tx_loadsz; | |
3462 | uart->capabilities = up->capabilities; | |
e676253b RRD |
3463 | uart->rs485_config = up->rs485_config; |
3464 | uart->rs485 = up->rs485; | |
9660497c | 3465 | |
6a3f45dc HK |
3466 | /* Take tx_loadsz from fifosize if it wasn't set separately */ |
3467 | if (uart->port.fifosize && !uart->tx_loadsz) | |
3468 | uart->tx_loadsz = uart->port.fifosize; | |
3469 | ||
f73fa05b MD |
3470 | if (up->port.dev) |
3471 | uart->port.dev = up->port.dev; | |
3472 | ||
3473 | if (up->port.flags & UPF_FIXED_TYPE) | |
3474 | serial8250_init_fixed_type_port(uart, up->port.type); | |
8e23fcc8 | 3475 | |
7d6a07d1 DD |
3476 | set_io_from_upio(&uart->port); |
3477 | /* Possibly override default I/O functions. */ | |
f73fa05b MD |
3478 | if (up->port.serial_in) |
3479 | uart->port.serial_in = up->port.serial_in; | |
3480 | if (up->port.serial_out) | |
3481 | uart->port.serial_out = up->port.serial_out; | |
3482 | if (up->port.handle_irq) | |
3483 | uart->port.handle_irq = up->port.handle_irq; | |
235dae5d | 3484 | /* Possibly override set_termios call */ |
f73fa05b MD |
3485 | if (up->port.set_termios) |
3486 | uart->port.set_termios = up->port.set_termios; | |
b99b121b SAS |
3487 | if (up->port.startup) |
3488 | uart->port.startup = up->port.startup; | |
3489 | if (up->port.shutdown) | |
3490 | uart->port.shutdown = up->port.shutdown; | |
f73fa05b MD |
3491 | if (up->port.pm) |
3492 | uart->port.pm = up->port.pm; | |
3493 | if (up->port.handle_break) | |
3494 | uart->port.handle_break = up->port.handle_break; | |
3495 | if (up->dl_read) | |
3496 | uart->dl_read = up->dl_read; | |
3497 | if (up->dl_write) | |
3498 | uart->dl_write = up->dl_write; | |
9ee4b83e HK |
3499 | if (up->dma) |
3500 | uart->dma = up->dma; | |
1da177e4 | 3501 | |
af7f3743 AC |
3502 | if (serial8250_isa_config != NULL) |
3503 | serial8250_isa_config(0, &uart->port, | |
3504 | &uart->capabilities); | |
3505 | ||
1da177e4 LT |
3506 | ret = uart_add_one_port(&serial8250_reg, &uart->port); |
3507 | if (ret == 0) | |
3508 | ret = uart->port.line; | |
3509 | } | |
f392ecfa | 3510 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
3511 | |
3512 | return ret; | |
3513 | } | |
f73fa05b MD |
3514 | EXPORT_SYMBOL(serial8250_register_8250_port); |
3515 | ||
1da177e4 LT |
3516 | /** |
3517 | * serial8250_unregister_port - remove a 16x50 serial port at runtime | |
3518 | * @line: serial line number | |
3519 | * | |
3520 | * Remove one serial port. This may not be called from interrupt | |
3521 | * context. We hand the port back to the our control. | |
3522 | */ | |
3523 | void serial8250_unregister_port(int line) | |
3524 | { | |
3525 | struct uart_8250_port *uart = &serial8250_ports[line]; | |
3526 | ||
f392ecfa | 3527 | mutex_lock(&serial_mutex); |
1da177e4 LT |
3528 | uart_remove_one_port(&serial8250_reg, &uart->port); |
3529 | if (serial8250_isa_devs) { | |
3530 | uart->port.flags &= ~UPF_BOOT_AUTOCONF; | |
3531 | uart->port.type = PORT_UNKNOWN; | |
3532 | uart->port.dev = &serial8250_isa_devs->dev; | |
cb01ece3 | 3533 | uart->capabilities = uart_config[uart->port.type].flags; |
1da177e4 LT |
3534 | uart_add_one_port(&serial8250_reg, &uart->port); |
3535 | } else { | |
3536 | uart->port.dev = NULL; | |
3537 | } | |
f392ecfa | 3538 | mutex_unlock(&serial_mutex); |
1da177e4 LT |
3539 | } |
3540 | EXPORT_SYMBOL(serial8250_unregister_port); | |
3541 | ||
3542 | static int __init serial8250_init(void) | |
3543 | { | |
25db8ad5 | 3544 | int ret; |
1da177e4 | 3545 | |
835d844d | 3546 | serial8250_isa_init_ports(); |
a61c2d78 | 3547 | |
f1fb9bb8 | 3548 | printk(KERN_INFO "Serial: 8250/16550 driver, " |
a61c2d78 | 3549 | "%d ports, IRQ sharing %sabled\n", nr_uarts, |
1da177e4 LT |
3550 | share_irqs ? "en" : "dis"); |
3551 | ||
b70ac771 DM |
3552 | #ifdef CONFIG_SPARC |
3553 | ret = sunserial_register_minors(&serial8250_reg, UART_NR); | |
3554 | #else | |
3555 | serial8250_reg.nr = UART_NR; | |
1da177e4 | 3556 | ret = uart_register_driver(&serial8250_reg); |
b70ac771 | 3557 | #endif |
1da177e4 LT |
3558 | if (ret) |
3559 | goto out; | |
3560 | ||
835d844d SY |
3561 | ret = serial8250_pnp_init(); |
3562 | if (ret) | |
3563 | goto unreg_uart_drv; | |
3564 | ||
7493a314 DT |
3565 | serial8250_isa_devs = platform_device_alloc("serial8250", |
3566 | PLAT8250_DEV_LEGACY); | |
3567 | if (!serial8250_isa_devs) { | |
3568 | ret = -ENOMEM; | |
835d844d | 3569 | goto unreg_pnp; |
1da177e4 LT |
3570 | } |
3571 | ||
7493a314 DT |
3572 | ret = platform_device_add(serial8250_isa_devs); |
3573 | if (ret) | |
3574 | goto put_dev; | |
3575 | ||
1da177e4 LT |
3576 | serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev); |
3577 | ||
bc965a7f RK |
3578 | ret = platform_driver_register(&serial8250_isa_driver); |
3579 | if (ret == 0) | |
3580 | goto out; | |
1da177e4 | 3581 | |
bc965a7f | 3582 | platform_device_del(serial8250_isa_devs); |
25db8ad5 | 3583 | put_dev: |
7493a314 | 3584 | platform_device_put(serial8250_isa_devs); |
835d844d SY |
3585 | unreg_pnp: |
3586 | serial8250_pnp_exit(); | |
25db8ad5 | 3587 | unreg_uart_drv: |
b70ac771 DM |
3588 | #ifdef CONFIG_SPARC |
3589 | sunserial_unregister_minors(&serial8250_reg, UART_NR); | |
3590 | #else | |
1da177e4 | 3591 | uart_unregister_driver(&serial8250_reg); |
b70ac771 | 3592 | #endif |
25db8ad5 | 3593 | out: |
1da177e4 LT |
3594 | return ret; |
3595 | } | |
3596 | ||
3597 | static void __exit serial8250_exit(void) | |
3598 | { | |
3599 | struct platform_device *isa_dev = serial8250_isa_devs; | |
3600 | ||
3601 | /* | |
3602 | * This tells serial8250_unregister_port() not to re-register | |
3603 | * the ports (thereby making serial8250_isa_driver permanently | |
3604 | * in use.) | |
3605 | */ | |
3606 | serial8250_isa_devs = NULL; | |
3607 | ||
3ae5eaec | 3608 | platform_driver_unregister(&serial8250_isa_driver); |
1da177e4 LT |
3609 | platform_device_unregister(isa_dev); |
3610 | ||
835d844d SY |
3611 | serial8250_pnp_exit(); |
3612 | ||
b70ac771 DM |
3613 | #ifdef CONFIG_SPARC |
3614 | sunserial_unregister_minors(&serial8250_reg, UART_NR); | |
3615 | #else | |
1da177e4 | 3616 | uart_unregister_driver(&serial8250_reg); |
b70ac771 | 3617 | #endif |
1da177e4 LT |
3618 | } |
3619 | ||
3620 | module_init(serial8250_init); | |
3621 | module_exit(serial8250_exit); | |
3622 | ||
3623 | EXPORT_SYMBOL(serial8250_suspend_port); | |
3624 | EXPORT_SYMBOL(serial8250_resume_port); | |
3625 | ||
3626 | MODULE_LICENSE("GPL"); | |
d87a6d95 | 3627 | MODULE_DESCRIPTION("Generic 8250/16x50 serial driver"); |
1da177e4 LT |
3628 | |
3629 | module_param(share_irqs, uint, 0644); | |
3630 | MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices" | |
3631 | " (unsafe)"); | |
3632 | ||
a61c2d78 DJ |
3633 | module_param(nr_uarts, uint, 0644); |
3634 | MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")"); | |
3635 | ||
d41a4b51 CE |
3636 | module_param(skip_txen_test, uint, 0644); |
3637 | MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time"); | |
3638 | ||
1da177e4 LT |
3639 | #ifdef CONFIG_SERIAL_8250_RSA |
3640 | module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444); | |
3641 | MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA"); | |
3642 | #endif | |
3643 | MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR); | |
f2b8dfd9 | 3644 | |
9326b047 | 3645 | #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS |
f2b8dfd9 JB |
3646 | #ifndef MODULE |
3647 | /* This module was renamed to 8250_core in 3.7. Keep the old "8250" name | |
3648 | * working as well for the module options so we don't break people. We | |
3649 | * need to keep the names identical and the convenient macros will happily | |
3650 | * refuse to let us do that by failing the build with redefinition errors | |
3651 | * of global variables. So we stick them inside a dummy function to avoid | |
3652 | * those conflicts. The options still get parsed, and the redefined | |
3653 | * MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive. | |
3654 | * | |
3655 | * This is hacky. I'm sorry. | |
3656 | */ | |
3657 | static void __used s8250_options(void) | |
3658 | { | |
3659 | #undef MODULE_PARAM_PREFIX | |
9196d8ac | 3660 | #define MODULE_PARAM_PREFIX "8250_core." |
f2b8dfd9 JB |
3661 | |
3662 | module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644); | |
3663 | module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644); | |
3664 | module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644); | |
3665 | #ifdef CONFIG_SERIAL_8250_RSA | |
3666 | __module_param_call(MODULE_PARAM_PREFIX, probe_rsa, | |
3667 | ¶m_array_ops, .arr = &__param_arr_probe_rsa, | |
3668 | 0444, -1); | |
3669 | #endif | |
3670 | } | |
3671 | #else | |
9196d8ac | 3672 | MODULE_ALIAS("8250_core"); |
f2b8dfd9 | 3673 | #endif |
f2b8dfd9 | 3674 | #endif |