Commit | Line | Data |
---|---|---|
238b8721 PK |
1 | /* |
2 | * uartlite.c: Serial driver for Xilinx uartlite serial controller | |
3 | * | |
852e1ea7 GL |
4 | * Copyright (C) 2006 Peter Korsgaard <jacmet@sunsite.dk> |
5 | * Copyright (C) 2007 Secret Lab Technologies Ltd. | |
238b8721 PK |
6 | * |
7 | * This file is licensed under the terms of the GNU General Public License | |
8 | * version 2. This program is licensed "as is" without any warranty of any | |
9 | * kind, whether express or implied. | |
10 | */ | |
11 | ||
12 | #include <linux/platform_device.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/console.h> | |
15 | #include <linux/serial.h> | |
16 | #include <linux/serial_core.h> | |
17 | #include <linux/tty.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/interrupt.h> | |
0e349b0e | 20 | #include <linux/init.h> |
238b8721 | 21 | #include <asm/io.h> |
07081fd8 | 22 | #if defined(CONFIG_OF) && (defined(CONFIG_PPC32) || defined(CONFIG_MICROBLAZE)) |
0e349b0e | 23 | #include <linux/of.h> |
22ae782f | 24 | #include <linux/of_address.h> |
852e1ea7 GL |
25 | #include <linux/of_device.h> |
26 | #include <linux/of_platform.h> | |
0e349b0e SN |
27 | |
28 | /* Match table for of_platform binding */ | |
29 | static struct of_device_id ulite_of_match[] __devinitdata = { | |
30 | { .compatible = "xlnx,opb-uartlite-1.00.b", }, | |
31 | { .compatible = "xlnx,xps-uartlite-1.00.a", }, | |
32 | {} | |
33 | }; | |
34 | MODULE_DEVICE_TABLE(of, ulite_of_match); | |
35 | ||
852e1ea7 | 36 | #endif |
238b8721 | 37 | |
00775828 | 38 | #define ULITE_NAME "ttyUL" |
238b8721 PK |
39 | #define ULITE_MAJOR 204 |
40 | #define ULITE_MINOR 187 | |
41 | #define ULITE_NR_UARTS 4 | |
42 | ||
435706b3 GL |
43 | /* --------------------------------------------------------------------- |
44 | * Register definitions | |
45 | * | |
46 | * For register details see datasheet: | |
631dd1a8 | 47 | * http://www.xilinx.com/support/documentation/ip_documentation/opb_uartlite.pdf |
435706b3 GL |
48 | */ |
49 | ||
238b8721 PK |
50 | #define ULITE_RX 0x00 |
51 | #define ULITE_TX 0x04 | |
52 | #define ULITE_STATUS 0x08 | |
53 | #define ULITE_CONTROL 0x0c | |
54 | ||
55 | #define ULITE_REGION 16 | |
56 | ||
57 | #define ULITE_STATUS_RXVALID 0x01 | |
58 | #define ULITE_STATUS_RXFULL 0x02 | |
59 | #define ULITE_STATUS_TXEMPTY 0x04 | |
60 | #define ULITE_STATUS_TXFULL 0x08 | |
61 | #define ULITE_STATUS_IE 0x10 | |
62 | #define ULITE_STATUS_OVERRUN 0x20 | |
63 | #define ULITE_STATUS_FRAME 0x40 | |
64 | #define ULITE_STATUS_PARITY 0x80 | |
65 | ||
66 | #define ULITE_CONTROL_RST_TX 0x01 | |
67 | #define ULITE_CONTROL_RST_RX 0x02 | |
68 | #define ULITE_CONTROL_IE 0x10 | |
69 | ||
70 | ||
483c79db | 71 | static struct uart_port ulite_ports[ULITE_NR_UARTS]; |
238b8721 | 72 | |
435706b3 GL |
73 | /* --------------------------------------------------------------------- |
74 | * Core UART driver operations | |
75 | */ | |
76 | ||
238b8721 PK |
77 | static int ulite_receive(struct uart_port *port, int stat) |
78 | { | |
ebd2c8f6 | 79 | struct tty_struct *tty = port->state->port.tty; |
238b8721 PK |
80 | unsigned char ch = 0; |
81 | char flag = TTY_NORMAL; | |
82 | ||
83 | if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN | |
84 | | ULITE_STATUS_FRAME)) == 0) | |
85 | return 0; | |
86 | ||
87 | /* stats */ | |
88 | if (stat & ULITE_STATUS_RXVALID) { | |
89 | port->icount.rx++; | |
e5bbbb18 | 90 | ch = ioread32be(port->membase + ULITE_RX); |
238b8721 PK |
91 | |
92 | if (stat & ULITE_STATUS_PARITY) | |
93 | port->icount.parity++; | |
94 | } | |
95 | ||
96 | if (stat & ULITE_STATUS_OVERRUN) | |
97 | port->icount.overrun++; | |
98 | ||
99 | if (stat & ULITE_STATUS_FRAME) | |
100 | port->icount.frame++; | |
101 | ||
102 | ||
103 | /* drop byte with parity error if IGNPAR specificed */ | |
104 | if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY) | |
105 | stat &= ~ULITE_STATUS_RXVALID; | |
106 | ||
107 | stat &= port->read_status_mask; | |
108 | ||
109 | if (stat & ULITE_STATUS_PARITY) | |
110 | flag = TTY_PARITY; | |
111 | ||
112 | ||
113 | stat &= ~port->ignore_status_mask; | |
114 | ||
115 | if (stat & ULITE_STATUS_RXVALID) | |
116 | tty_insert_flip_char(tty, ch, flag); | |
117 | ||
118 | if (stat & ULITE_STATUS_FRAME) | |
119 | tty_insert_flip_char(tty, 0, TTY_FRAME); | |
120 | ||
121 | if (stat & ULITE_STATUS_OVERRUN) | |
122 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
123 | ||
124 | return 1; | |
125 | } | |
126 | ||
127 | static int ulite_transmit(struct uart_port *port, int stat) | |
128 | { | |
ebd2c8f6 | 129 | struct circ_buf *xmit = &port->state->xmit; |
238b8721 PK |
130 | |
131 | if (stat & ULITE_STATUS_TXFULL) | |
132 | return 0; | |
133 | ||
134 | if (port->x_char) { | |
e5bbbb18 | 135 | iowrite32be(port->x_char, port->membase + ULITE_TX); |
238b8721 PK |
136 | port->x_char = 0; |
137 | port->icount.tx++; | |
138 | return 1; | |
139 | } | |
140 | ||
141 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) | |
142 | return 0; | |
143 | ||
e5bbbb18 | 144 | iowrite32be(xmit->buf[xmit->tail], port->membase + ULITE_TX); |
238b8721 PK |
145 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1); |
146 | port->icount.tx++; | |
147 | ||
148 | /* wake up */ | |
149 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
150 | uart_write_wakeup(port); | |
151 | ||
152 | return 1; | |
153 | } | |
154 | ||
155 | static irqreturn_t ulite_isr(int irq, void *dev_id) | |
156 | { | |
15aafa2f | 157 | struct uart_port *port = dev_id; |
d2cfe962 | 158 | int busy, n = 0; |
238b8721 PK |
159 | |
160 | do { | |
e5bbbb18 | 161 | int stat = ioread32be(port->membase + ULITE_STATUS); |
238b8721 PK |
162 | busy = ulite_receive(port, stat); |
163 | busy |= ulite_transmit(port, stat); | |
d2cfe962 | 164 | n++; |
238b8721 PK |
165 | } while (busy); |
166 | ||
d2cfe962 PK |
167 | /* work done? */ |
168 | if (n > 1) { | |
169 | tty_flip_buffer_push(port->state->port.tty); | |
170 | return IRQ_HANDLED; | |
171 | } else { | |
172 | return IRQ_NONE; | |
173 | } | |
238b8721 PK |
174 | } |
175 | ||
176 | static unsigned int ulite_tx_empty(struct uart_port *port) | |
177 | { | |
178 | unsigned long flags; | |
179 | unsigned int ret; | |
180 | ||
181 | spin_lock_irqsave(&port->lock, flags); | |
e5bbbb18 | 182 | ret = ioread32be(port->membase + ULITE_STATUS); |
238b8721 PK |
183 | spin_unlock_irqrestore(&port->lock, flags); |
184 | ||
185 | return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0; | |
186 | } | |
187 | ||
188 | static unsigned int ulite_get_mctrl(struct uart_port *port) | |
189 | { | |
190 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
191 | } | |
192 | ||
193 | static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
194 | { | |
195 | /* N/A */ | |
196 | } | |
197 | ||
198 | static void ulite_stop_tx(struct uart_port *port) | |
199 | { | |
200 | /* N/A */ | |
201 | } | |
202 | ||
203 | static void ulite_start_tx(struct uart_port *port) | |
204 | { | |
e5bbbb18 | 205 | ulite_transmit(port, ioread32be(port->membase + ULITE_STATUS)); |
238b8721 PK |
206 | } |
207 | ||
208 | static void ulite_stop_rx(struct uart_port *port) | |
209 | { | |
210 | /* don't forward any more data (like !CREAD) */ | |
211 | port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY | |
212 | | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; | |
213 | } | |
214 | ||
215 | static void ulite_enable_ms(struct uart_port *port) | |
216 | { | |
217 | /* N/A */ | |
218 | } | |
219 | ||
220 | static void ulite_break_ctl(struct uart_port *port, int ctl) | |
221 | { | |
222 | /* N/A */ | |
223 | } | |
224 | ||
225 | static int ulite_startup(struct uart_port *port) | |
226 | { | |
227 | int ret; | |
228 | ||
229 | ret = request_irq(port->irq, ulite_isr, | |
d2cfe962 | 230 | IRQF_SHARED | IRQF_SAMPLE_RANDOM, "uartlite", port); |
238b8721 PK |
231 | if (ret) |
232 | return ret; | |
233 | ||
e5bbbb18 | 234 | iowrite32be(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX, |
e077b50c | 235 | port->membase + ULITE_CONTROL); |
e5bbbb18 | 236 | iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL); |
238b8721 PK |
237 | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static void ulite_shutdown(struct uart_port *port) | |
242 | { | |
e5bbbb18 JL |
243 | iowrite32be(0, port->membase + ULITE_CONTROL); |
244 | ioread32be(port->membase + ULITE_CONTROL); /* dummy */ | |
238b8721 PK |
245 | free_irq(port->irq, port); |
246 | } | |
247 | ||
606d099c AC |
248 | static void ulite_set_termios(struct uart_port *port, struct ktermios *termios, |
249 | struct ktermios *old) | |
238b8721 PK |
250 | { |
251 | unsigned long flags; | |
252 | unsigned int baud; | |
253 | ||
254 | spin_lock_irqsave(&port->lock, flags); | |
255 | ||
256 | port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN | |
257 | | ULITE_STATUS_TXFULL; | |
258 | ||
259 | if (termios->c_iflag & INPCK) | |
260 | port->read_status_mask |= | |
261 | ULITE_STATUS_PARITY | ULITE_STATUS_FRAME; | |
262 | ||
263 | port->ignore_status_mask = 0; | |
264 | if (termios->c_iflag & IGNPAR) | |
265 | port->ignore_status_mask |= ULITE_STATUS_PARITY | |
266 | | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; | |
267 | ||
268 | /* ignore all characters if CREAD is not set */ | |
269 | if ((termios->c_cflag & CREAD) == 0) | |
270 | port->ignore_status_mask |= | |
271 | ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY | |
272 | | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; | |
273 | ||
274 | /* update timeout */ | |
275 | baud = uart_get_baud_rate(port, termios, old, 0, 460800); | |
276 | uart_update_timeout(port, termios->c_cflag, baud); | |
277 | ||
278 | spin_unlock_irqrestore(&port->lock, flags); | |
279 | } | |
280 | ||
281 | static const char *ulite_type(struct uart_port *port) | |
282 | { | |
283 | return port->type == PORT_UARTLITE ? "uartlite" : NULL; | |
284 | } | |
285 | ||
286 | static void ulite_release_port(struct uart_port *port) | |
287 | { | |
288 | release_mem_region(port->mapbase, ULITE_REGION); | |
289 | iounmap(port->membase); | |
b81831c6 | 290 | port->membase = NULL; |
238b8721 PK |
291 | } |
292 | ||
293 | static int ulite_request_port(struct uart_port *port) | |
294 | { | |
a1080968 GL |
295 | pr_debug("ulite console: port=%p; port->mapbase=%llx\n", |
296 | port, (unsigned long long) port->mapbase); | |
0e349b0e | 297 | |
238b8721 PK |
298 | if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) { |
299 | dev_err(port->dev, "Memory region busy\n"); | |
300 | return -EBUSY; | |
301 | } | |
302 | ||
303 | port->membase = ioremap(port->mapbase, ULITE_REGION); | |
304 | if (!port->membase) { | |
305 | dev_err(port->dev, "Unable to map registers\n"); | |
306 | release_mem_region(port->mapbase, ULITE_REGION); | |
307 | return -EBUSY; | |
308 | } | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static void ulite_config_port(struct uart_port *port, int flags) | |
314 | { | |
e21654a7 PK |
315 | if (!ulite_request_port(port)) |
316 | port->type = PORT_UARTLITE; | |
238b8721 PK |
317 | } |
318 | ||
319 | static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser) | |
320 | { | |
321 | /* we don't want the core code to modify any port params */ | |
322 | return -EINVAL; | |
323 | } | |
324 | ||
8a28af7f MS |
325 | #ifdef CONFIG_CONSOLE_POLL |
326 | static int ulite_get_poll_char(struct uart_port *port) | |
327 | { | |
328 | if (!(ioread32be(port->membase + ULITE_STATUS) | |
329 | & ULITE_STATUS_RXVALID)) | |
330 | return NO_POLL_CHAR; | |
331 | ||
332 | return ioread32be(port->membase + ULITE_RX); | |
333 | } | |
334 | ||
335 | static void ulite_put_poll_char(struct uart_port *port, unsigned char ch) | |
336 | { | |
337 | while (ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_TXFULL) | |
338 | cpu_relax(); | |
339 | ||
340 | /* write char to device */ | |
341 | iowrite32be(ch, port->membase + ULITE_TX); | |
342 | } | |
343 | #endif | |
344 | ||
238b8721 PK |
345 | static struct uart_ops ulite_ops = { |
346 | .tx_empty = ulite_tx_empty, | |
347 | .set_mctrl = ulite_set_mctrl, | |
348 | .get_mctrl = ulite_get_mctrl, | |
349 | .stop_tx = ulite_stop_tx, | |
350 | .start_tx = ulite_start_tx, | |
351 | .stop_rx = ulite_stop_rx, | |
352 | .enable_ms = ulite_enable_ms, | |
353 | .break_ctl = ulite_break_ctl, | |
354 | .startup = ulite_startup, | |
355 | .shutdown = ulite_shutdown, | |
356 | .set_termios = ulite_set_termios, | |
357 | .type = ulite_type, | |
358 | .release_port = ulite_release_port, | |
359 | .request_port = ulite_request_port, | |
360 | .config_port = ulite_config_port, | |
8a28af7f MS |
361 | .verify_port = ulite_verify_port, |
362 | #ifdef CONFIG_CONSOLE_POLL | |
363 | .poll_get_char = ulite_get_poll_char, | |
364 | .poll_put_char = ulite_put_poll_char, | |
365 | #endif | |
238b8721 PK |
366 | }; |
367 | ||
435706b3 GL |
368 | /* --------------------------------------------------------------------- |
369 | * Console driver operations | |
370 | */ | |
371 | ||
238b8721 PK |
372 | #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE |
373 | static void ulite_console_wait_tx(struct uart_port *port) | |
374 | { | |
375 | int i; | |
1d6b6987 | 376 | u8 val; |
238b8721 | 377 | |
1d6b6987 GL |
378 | /* Spin waiting for TX fifo to have space available */ |
379 | for (i = 0; i < 100000; i++) { | |
e5bbbb18 | 380 | val = ioread32be(port->membase + ULITE_STATUS); |
1d6b6987 | 381 | if ((val & ULITE_STATUS_TXFULL) == 0) |
238b8721 | 382 | break; |
1d6b6987 | 383 | cpu_relax(); |
238b8721 PK |
384 | } |
385 | } | |
386 | ||
387 | static void ulite_console_putchar(struct uart_port *port, int ch) | |
388 | { | |
389 | ulite_console_wait_tx(port); | |
e5bbbb18 | 390 | iowrite32be(ch, port->membase + ULITE_TX); |
238b8721 PK |
391 | } |
392 | ||
393 | static void ulite_console_write(struct console *co, const char *s, | |
394 | unsigned int count) | |
395 | { | |
483c79db | 396 | struct uart_port *port = &ulite_ports[co->index]; |
238b8721 PK |
397 | unsigned long flags; |
398 | unsigned int ier; | |
399 | int locked = 1; | |
400 | ||
401 | if (oops_in_progress) { | |
402 | locked = spin_trylock_irqsave(&port->lock, flags); | |
403 | } else | |
404 | spin_lock_irqsave(&port->lock, flags); | |
405 | ||
406 | /* save and disable interrupt */ | |
e5bbbb18 JL |
407 | ier = ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_IE; |
408 | iowrite32be(0, port->membase + ULITE_CONTROL); | |
238b8721 PK |
409 | |
410 | uart_console_write(port, s, count, ulite_console_putchar); | |
411 | ||
412 | ulite_console_wait_tx(port); | |
413 | ||
414 | /* restore interrupt state */ | |
415 | if (ier) | |
e5bbbb18 | 416 | iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL); |
238b8721 PK |
417 | |
418 | if (locked) | |
419 | spin_unlock_irqrestore(&port->lock, flags); | |
420 | } | |
421 | ||
03eac7bb | 422 | static int __devinit ulite_console_setup(struct console *co, char *options) |
238b8721 PK |
423 | { |
424 | struct uart_port *port; | |
425 | int baud = 9600; | |
426 | int bits = 8; | |
427 | int parity = 'n'; | |
428 | int flow = 'n'; | |
429 | ||
430 | if (co->index < 0 || co->index >= ULITE_NR_UARTS) | |
431 | return -EINVAL; | |
432 | ||
483c79db | 433 | port = &ulite_ports[co->index]; |
238b8721 | 434 | |
3de66a17 | 435 | /* Has the device been initialized yet? */ |
fb4e6e66 GL |
436 | if (!port->mapbase) { |
437 | pr_debug("console on ttyUL%i not present\n", co->index); | |
438 | return -ENODEV; | |
439 | } | |
440 | ||
238b8721 | 441 | /* not initialized yet? */ |
852e1ea7 | 442 | if (!port->membase) { |
fb4e6e66 GL |
443 | if (ulite_request_port(port)) |
444 | return -ENODEV; | |
852e1ea7 | 445 | } |
238b8721 PK |
446 | |
447 | if (options) | |
448 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
449 | ||
450 | return uart_set_options(port, co, baud, parity, bits, flow); | |
451 | } | |
452 | ||
453 | static struct uart_driver ulite_uart_driver; | |
454 | ||
455 | static struct console ulite_console = { | |
00775828 | 456 | .name = ULITE_NAME, |
238b8721 PK |
457 | .write = ulite_console_write, |
458 | .device = uart_console_device, | |
459 | .setup = ulite_console_setup, | |
460 | .flags = CON_PRINTBUFFER, | |
461 | .index = -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */ | |
462 | .data = &ulite_uart_driver, | |
463 | }; | |
464 | ||
465 | static int __init ulite_console_init(void) | |
466 | { | |
467 | register_console(&ulite_console); | |
468 | return 0; | |
469 | } | |
470 | ||
471 | console_initcall(ulite_console_init); | |
472 | ||
473 | #endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */ | |
474 | ||
475 | static struct uart_driver ulite_uart_driver = { | |
476 | .owner = THIS_MODULE, | |
477 | .driver_name = "uartlite", | |
00775828 | 478 | .dev_name = ULITE_NAME, |
238b8721 PK |
479 | .major = ULITE_MAJOR, |
480 | .minor = ULITE_MINOR, | |
481 | .nr = ULITE_NR_UARTS, | |
482 | #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE | |
483 | .cons = &ulite_console, | |
484 | #endif | |
485 | }; | |
486 | ||
435706b3 GL |
487 | /* --------------------------------------------------------------------- |
488 | * Port assignment functions (mapping devices to uart_port structures) | |
489 | */ | |
490 | ||
491 | /** ulite_assign: register a uartlite device with the driver | |
492 | * | |
493 | * @dev: pointer to device structure | |
494 | * @id: requested id number. Pass -1 for automatic port assignment | |
495 | * @base: base address of uartlite registers | |
496 | * @irq: irq number for uartlite | |
497 | * | |
498 | * Returns: 0 on success, <0 otherwise | |
499 | */ | |
8fa7b610 | 500 | static int __devinit ulite_assign(struct device *dev, int id, u32 base, int irq) |
238b8721 | 501 | { |
238b8721 | 502 | struct uart_port *port; |
8fa7b610 | 503 | int rc; |
238b8721 | 504 | |
8fa7b610 GL |
505 | /* if id = -1; then scan for a free id and use that */ |
506 | if (id < 0) { | |
507 | for (id = 0; id < ULITE_NR_UARTS; id++) | |
508 | if (ulite_ports[id].mapbase == 0) | |
509 | break; | |
510 | } | |
511 | if (id < 0 || id >= ULITE_NR_UARTS) { | |
512 | dev_err(dev, "%s%i too large\n", ULITE_NAME, id); | |
238b8721 | 513 | return -EINVAL; |
8fa7b610 | 514 | } |
238b8721 | 515 | |
fb4e6e66 | 516 | if ((ulite_ports[id].mapbase) && (ulite_ports[id].mapbase != base)) { |
8fa7b610 GL |
517 | dev_err(dev, "cannot assign to %s%i; it is already in use\n", |
518 | ULITE_NAME, id); | |
238b8721 | 519 | return -EBUSY; |
8fa7b610 | 520 | } |
238b8721 | 521 | |
8fa7b610 | 522 | port = &ulite_ports[id]; |
238b8721 | 523 | |
8fa7b610 GL |
524 | spin_lock_init(&port->lock); |
525 | port->fifosize = 16; | |
526 | port->regshift = 2; | |
527 | port->iotype = UPIO_MEM; | |
528 | port->iobase = 1; /* mark port in use */ | |
529 | port->mapbase = base; | |
530 | port->membase = NULL; | |
531 | port->ops = &ulite_ops; | |
532 | port->irq = irq; | |
533 | port->flags = UPF_BOOT_AUTOCONF; | |
534 | port->dev = dev; | |
535 | port->type = PORT_UNKNOWN; | |
536 | port->line = id; | |
537 | ||
538 | dev_set_drvdata(dev, port); | |
539 | ||
540 | /* Register the port */ | |
541 | rc = uart_add_one_port(&ulite_uart_driver, port); | |
542 | if (rc) { | |
543 | dev_err(dev, "uart_add_one_port() failed; err=%i\n", rc); | |
544 | port->mapbase = 0; | |
545 | dev_set_drvdata(dev, NULL); | |
546 | return rc; | |
547 | } | |
238b8721 | 548 | |
8fa7b610 GL |
549 | return 0; |
550 | } | |
238b8721 | 551 | |
435706b3 GL |
552 | /** ulite_release: register a uartlite device with the driver |
553 | * | |
554 | * @dev: pointer to device structure | |
555 | */ | |
f67702a3 | 556 | static int __devexit ulite_release(struct device *dev) |
8fa7b610 GL |
557 | { |
558 | struct uart_port *port = dev_get_drvdata(dev); | |
559 | int rc = 0; | |
238b8721 | 560 | |
8fa7b610 GL |
561 | if (port) { |
562 | rc = uart_remove_one_port(&ulite_uart_driver, port); | |
563 | dev_set_drvdata(dev, NULL); | |
564 | port->mapbase = 0; | |
565 | } | |
238b8721 | 566 | |
8fa7b610 | 567 | return rc; |
238b8721 PK |
568 | } |
569 | ||
435706b3 GL |
570 | /* --------------------------------------------------------------------- |
571 | * Platform bus binding | |
572 | */ | |
573 | ||
8fa7b610 | 574 | static int __devinit ulite_probe(struct platform_device *pdev) |
238b8721 | 575 | { |
8fa7b610 | 576 | struct resource *res, *res2; |
238b8721 | 577 | |
8fa7b610 GL |
578 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
579 | if (!res) | |
580 | return -ENODEV; | |
238b8721 | 581 | |
8fa7b610 GL |
582 | res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
583 | if (!res2) | |
584 | return -ENODEV; | |
238b8721 | 585 | |
8fa7b610 GL |
586 | return ulite_assign(&pdev->dev, pdev->id, res->start, res2->start); |
587 | } | |
238b8721 | 588 | |
f67702a3 | 589 | static int __devexit ulite_remove(struct platform_device *pdev) |
8fa7b610 GL |
590 | { |
591 | return ulite_release(&pdev->dev); | |
238b8721 PK |
592 | } |
593 | ||
e169c139 KS |
594 | /* work with hotplug and coldplug */ |
595 | MODULE_ALIAS("platform:uartlite"); | |
596 | ||
238b8721 PK |
597 | static struct platform_driver ulite_platform_driver = { |
598 | .probe = ulite_probe, | |
f67702a3 | 599 | .remove = __devexit_p(ulite_remove), |
238b8721 PK |
600 | .driver = { |
601 | .owner = THIS_MODULE, | |
602 | .name = "uartlite", | |
603 | }, | |
604 | }; | |
605 | ||
852e1ea7 GL |
606 | /* --------------------------------------------------------------------- |
607 | * OF bus bindings | |
608 | */ | |
07081fd8 | 609 | #if defined(CONFIG_OF) && (defined(CONFIG_PPC32) || defined(CONFIG_MICROBLAZE)) |
852e1ea7 | 610 | static int __devinit |
2dc11581 | 611 | ulite_of_probe(struct platform_device *op, const struct of_device_id *match) |
852e1ea7 GL |
612 | { |
613 | struct resource res; | |
614 | const unsigned int *id; | |
615 | int irq, rc; | |
616 | ||
71cc2c21 | 617 | dev_dbg(&op->dev, "%s(%p, %p)\n", __func__, op, match); |
852e1ea7 | 618 | |
61c7a080 | 619 | rc = of_address_to_resource(op->dev.of_node, 0, &res); |
852e1ea7 | 620 | if (rc) { |
e077b50c | 621 | dev_err(&op->dev, "invalid address\n"); |
852e1ea7 GL |
622 | return rc; |
623 | } | |
624 | ||
61c7a080 | 625 | irq = irq_of_parse_and_map(op->dev.of_node, 0); |
852e1ea7 | 626 | |
61c7a080 | 627 | id = of_get_property(op->dev.of_node, "port-number", NULL); |
852e1ea7 | 628 | |
e5bbbb18 | 629 | return ulite_assign(&op->dev, id ? *id : -1, res.start, irq); |
852e1ea7 GL |
630 | } |
631 | ||
2dc11581 | 632 | static int __devexit ulite_of_remove(struct platform_device *op) |
852e1ea7 GL |
633 | { |
634 | return ulite_release(&op->dev); | |
635 | } | |
636 | ||
852e1ea7 | 637 | static struct of_platform_driver ulite_of_driver = { |
852e1ea7 GL |
638 | .probe = ulite_of_probe, |
639 | .remove = __devexit_p(ulite_of_remove), | |
640 | .driver = { | |
641 | .name = "uartlite", | |
4018294b GL |
642 | .owner = THIS_MODULE, |
643 | .of_match_table = ulite_of_match, | |
852e1ea7 GL |
644 | }, |
645 | }; | |
646 | ||
647 | /* Registration helpers to keep the number of #ifdefs to a minimum */ | |
648 | static inline int __init ulite_of_register(void) | |
649 | { | |
650 | pr_debug("uartlite: calling of_register_platform_driver()\n"); | |
651 | return of_register_platform_driver(&ulite_of_driver); | |
652 | } | |
653 | ||
654 | static inline void __exit ulite_of_unregister(void) | |
655 | { | |
656 | of_unregister_platform_driver(&ulite_of_driver); | |
657 | } | |
07081fd8 DM |
658 | #else /* CONFIG_OF && (CONFIG_PPC32 || CONFIG_MICROBLAZE) */ |
659 | /* Appropriate config not enabled; do nothing helpers */ | |
852e1ea7 GL |
660 | static inline int __init ulite_of_register(void) { return 0; } |
661 | static inline void __exit ulite_of_unregister(void) { } | |
07081fd8 | 662 | #endif /* CONFIG_OF && (CONFIG_PPC32 || CONFIG_MICROBLAZE) */ |
852e1ea7 | 663 | |
435706b3 GL |
664 | /* --------------------------------------------------------------------- |
665 | * Module setup/teardown | |
666 | */ | |
667 | ||
238b8721 PK |
668 | int __init ulite_init(void) |
669 | { | |
670 | int ret; | |
671 | ||
852e1ea7 | 672 | pr_debug("uartlite: calling uart_register_driver()\n"); |
238b8721 PK |
673 | ret = uart_register_driver(&ulite_uart_driver); |
674 | if (ret) | |
852e1ea7 GL |
675 | goto err_uart; |
676 | ||
677 | ret = ulite_of_register(); | |
678 | if (ret) | |
679 | goto err_of; | |
238b8721 | 680 | |
852e1ea7 | 681 | pr_debug("uartlite: calling platform_driver_register()\n"); |
238b8721 PK |
682 | ret = platform_driver_register(&ulite_platform_driver); |
683 | if (ret) | |
852e1ea7 GL |
684 | goto err_plat; |
685 | ||
686 | return 0; | |
238b8721 | 687 | |
852e1ea7 GL |
688 | err_plat: |
689 | ulite_of_unregister(); | |
690 | err_of: | |
691 | uart_unregister_driver(&ulite_uart_driver); | |
692 | err_uart: | |
693 | printk(KERN_ERR "registering uartlite driver failed: err=%i", ret); | |
238b8721 PK |
694 | return ret; |
695 | } | |
696 | ||
697 | void __exit ulite_exit(void) | |
698 | { | |
699 | platform_driver_unregister(&ulite_platform_driver); | |
852e1ea7 | 700 | ulite_of_unregister(); |
238b8721 PK |
701 | uart_unregister_driver(&ulite_uart_driver); |
702 | } | |
703 | ||
704 | module_init(ulite_init); | |
705 | module_exit(ulite_exit); | |
706 | ||
707 | MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>"); | |
708 | MODULE_DESCRIPTION("Xilinx uartlite serial driver"); | |
709 | MODULE_LICENSE("GPL"); |