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b7396a38 CZ |
1 | /* |
2 | * Copyright (C) 2012-2015 Spreadtrum Communications Inc. | |
3 | * | |
4 | * This software is licensed under the terms of the GNU General Public | |
5 | * License version 2, as published by the Free Software Foundation, and | |
6 | * may be copied, distributed, and modified under those terms. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #if defined(CONFIG_SERIAL_SPRD_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
15 | #define SUPPORT_SYSRQ | |
16 | #endif | |
17 | ||
18 | #include <linux/clk.h> | |
19 | #include <linux/console.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/io.h> | |
22 | #include <linux/ioport.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/of.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/serial_core.h> | |
28 | #include <linux/serial.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/tty.h> | |
31 | #include <linux/tty_flip.h> | |
32 | ||
33 | /* device name */ | |
34 | #define UART_NR_MAX 8 | |
35 | #define SPRD_TTY_NAME "ttyS" | |
36 | #define SPRD_FIFO_SIZE 128 | |
37 | #define SPRD_DEF_RATE 26000000 | |
38 | #define SPRD_BAUD_IO_LIMIT 3000000 | |
39 | #define SPRD_TIMEOUT 256 | |
40 | ||
41 | /* the offset of serial registers and BITs for them */ | |
42 | /* data registers */ | |
43 | #define SPRD_TXD 0x0000 | |
44 | #define SPRD_RXD 0x0004 | |
45 | ||
46 | /* line status register and its BITs */ | |
47 | #define SPRD_LSR 0x0008 | |
48 | #define SPRD_LSR_OE BIT(4) | |
49 | #define SPRD_LSR_FE BIT(3) | |
50 | #define SPRD_LSR_PE BIT(2) | |
51 | #define SPRD_LSR_BI BIT(7) | |
52 | #define SPRD_LSR_TX_OVER BIT(15) | |
53 | ||
54 | /* data number in TX and RX fifo */ | |
55 | #define SPRD_STS1 0x000C | |
56 | ||
57 | /* interrupt enable register and its BITs */ | |
58 | #define SPRD_IEN 0x0010 | |
59 | #define SPRD_IEN_RX_FULL BIT(0) | |
60 | #define SPRD_IEN_TX_EMPTY BIT(1) | |
61 | #define SPRD_IEN_BREAK_DETECT BIT(7) | |
62 | #define SPRD_IEN_TIMEOUT BIT(13) | |
63 | ||
64 | /* interrupt clear register */ | |
65 | #define SPRD_ICLR 0x0014 | |
66 | ||
67 | /* line control register */ | |
68 | #define SPRD_LCR 0x0018 | |
69 | #define SPRD_LCR_STOP_1BIT 0x10 | |
70 | #define SPRD_LCR_STOP_2BIT 0x30 | |
71 | #define SPRD_LCR_DATA_LEN (BIT(2) | BIT(3)) | |
72 | #define SPRD_LCR_DATA_LEN5 0x0 | |
73 | #define SPRD_LCR_DATA_LEN6 0x4 | |
74 | #define SPRD_LCR_DATA_LEN7 0x8 | |
75 | #define SPRD_LCR_DATA_LEN8 0xc | |
76 | #define SPRD_LCR_PARITY (BIT(0) | BIT(1)) | |
77 | #define SPRD_LCR_PARITY_EN 0x2 | |
78 | #define SPRD_LCR_EVEN_PAR 0x0 | |
79 | #define SPRD_LCR_ODD_PAR 0x1 | |
80 | ||
81 | /* control register 1 */ | |
82 | #define SPRD_CTL1 0x001C | |
83 | #define RX_HW_FLOW_CTL_THLD BIT(6) | |
84 | #define RX_HW_FLOW_CTL_EN BIT(7) | |
85 | #define TX_HW_FLOW_CTL_EN BIT(8) | |
86 | #define RX_TOUT_THLD_DEF 0x3E00 | |
87 | #define RX_HFC_THLD_DEF 0x40 | |
88 | ||
89 | /* fifo threshold register */ | |
90 | #define SPRD_CTL2 0x0020 | |
91 | #define THLD_TX_EMPTY 0x40 | |
92 | #define THLD_RX_FULL 0x40 | |
93 | ||
94 | /* config baud rate register */ | |
95 | #define SPRD_CLKD0 0x0024 | |
96 | #define SPRD_CLKD1 0x0028 | |
97 | ||
98 | /* interrupt mask status register */ | |
99 | #define SPRD_IMSR 0x002C | |
100 | #define SPRD_IMSR_RX_FIFO_FULL BIT(0) | |
101 | #define SPRD_IMSR_TX_FIFO_EMPTY BIT(1) | |
102 | #define SPRD_IMSR_BREAK_DETECT BIT(7) | |
103 | #define SPRD_IMSR_TIMEOUT BIT(13) | |
104 | ||
105 | struct reg_backup { | |
106 | u32 ien; | |
107 | u32 ctrl0; | |
108 | u32 ctrl1; | |
109 | u32 ctrl2; | |
110 | u32 clkd0; | |
111 | u32 clkd1; | |
112 | u32 dspwait; | |
113 | }; | |
114 | ||
115 | struct sprd_uart_port { | |
116 | struct uart_port port; | |
117 | struct reg_backup reg_bak; | |
118 | char name[16]; | |
119 | }; | |
120 | ||
121 | static struct sprd_uart_port *sprd_port[UART_NR_MAX]; | |
122 | static int sprd_ports_num; | |
123 | ||
124 | static inline unsigned int serial_in(struct uart_port *port, int offset) | |
125 | { | |
126 | return readl_relaxed(port->membase + offset); | |
127 | } | |
128 | ||
129 | static inline void serial_out(struct uart_port *port, int offset, int value) | |
130 | { | |
131 | writel_relaxed(value, port->membase + offset); | |
132 | } | |
133 | ||
134 | static unsigned int sprd_tx_empty(struct uart_port *port) | |
135 | { | |
136 | if (serial_in(port, SPRD_STS1) & 0xff00) | |
137 | return 0; | |
138 | else | |
139 | return TIOCSER_TEMT; | |
140 | } | |
141 | ||
142 | static unsigned int sprd_get_mctrl(struct uart_port *port) | |
143 | { | |
144 | return TIOCM_DSR | TIOCM_CTS; | |
145 | } | |
146 | ||
147 | static void sprd_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
148 | { | |
149 | /* nothing to do */ | |
150 | } | |
151 | ||
152 | static void sprd_stop_tx(struct uart_port *port) | |
153 | { | |
154 | unsigned int ien, iclr; | |
155 | ||
156 | iclr = serial_in(port, SPRD_ICLR); | |
157 | ien = serial_in(port, SPRD_IEN); | |
158 | ||
159 | iclr |= SPRD_IEN_TX_EMPTY; | |
160 | ien &= ~SPRD_IEN_TX_EMPTY; | |
161 | ||
162 | serial_out(port, SPRD_ICLR, iclr); | |
163 | serial_out(port, SPRD_IEN, ien); | |
164 | } | |
165 | ||
166 | static void sprd_start_tx(struct uart_port *port) | |
167 | { | |
168 | unsigned int ien; | |
169 | ||
170 | ien = serial_in(port, SPRD_IEN); | |
171 | if (!(ien & SPRD_IEN_TX_EMPTY)) { | |
172 | ien |= SPRD_IEN_TX_EMPTY; | |
173 | serial_out(port, SPRD_IEN, ien); | |
174 | } | |
175 | } | |
176 | ||
177 | static void sprd_stop_rx(struct uart_port *port) | |
178 | { | |
179 | unsigned int ien, iclr; | |
180 | ||
181 | iclr = serial_in(port, SPRD_ICLR); | |
182 | ien = serial_in(port, SPRD_IEN); | |
183 | ||
184 | ien &= ~(SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT); | |
185 | iclr |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT; | |
186 | ||
187 | serial_out(port, SPRD_IEN, ien); | |
188 | serial_out(port, SPRD_ICLR, iclr); | |
189 | } | |
190 | ||
191 | /* The Sprd serial does not support this function. */ | |
192 | static void sprd_break_ctl(struct uart_port *port, int break_state) | |
193 | { | |
194 | /* nothing to do */ | |
195 | } | |
196 | ||
197 | static int handle_lsr_errors(struct uart_port *port, | |
198 | unsigned int *flag, | |
199 | unsigned int *lsr) | |
200 | { | |
201 | int ret = 0; | |
202 | ||
203 | /* statistics */ | |
204 | if (*lsr & SPRD_LSR_BI) { | |
205 | *lsr &= ~(SPRD_LSR_FE | SPRD_LSR_PE); | |
206 | port->icount.brk++; | |
207 | ret = uart_handle_break(port); | |
208 | if (ret) | |
209 | return ret; | |
210 | } else if (*lsr & SPRD_LSR_PE) | |
211 | port->icount.parity++; | |
212 | else if (*lsr & SPRD_LSR_FE) | |
213 | port->icount.frame++; | |
214 | if (*lsr & SPRD_LSR_OE) | |
215 | port->icount.overrun++; | |
216 | ||
217 | /* mask off conditions which should be ignored */ | |
218 | *lsr &= port->read_status_mask; | |
219 | if (*lsr & SPRD_LSR_BI) | |
220 | *flag = TTY_BREAK; | |
221 | else if (*lsr & SPRD_LSR_PE) | |
222 | *flag = TTY_PARITY; | |
223 | else if (*lsr & SPRD_LSR_FE) | |
224 | *flag = TTY_FRAME; | |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
229 | static inline void sprd_rx(struct uart_port *port) | |
230 | { | |
231 | struct tty_port *tty = &port->state->port; | |
232 | unsigned int ch, flag, lsr, max_count = SPRD_TIMEOUT; | |
233 | ||
234 | while ((serial_in(port, SPRD_STS1) & 0x00ff) && max_count--) { | |
235 | lsr = serial_in(port, SPRD_LSR); | |
236 | ch = serial_in(port, SPRD_RXD); | |
237 | flag = TTY_NORMAL; | |
238 | port->icount.rx++; | |
239 | ||
240 | if (lsr & (SPRD_LSR_BI | SPRD_LSR_PE | | |
241 | SPRD_LSR_FE | SPRD_LSR_OE)) | |
242 | if (handle_lsr_errors(port, &lsr, &flag)) | |
243 | continue; | |
244 | if (uart_handle_sysrq_char(port, ch)) | |
245 | continue; | |
246 | ||
247 | uart_insert_char(port, lsr, SPRD_LSR_OE, ch, flag); | |
248 | } | |
249 | ||
250 | tty_flip_buffer_push(tty); | |
251 | } | |
252 | ||
253 | static inline void sprd_tx(struct uart_port *port) | |
254 | { | |
255 | struct circ_buf *xmit = &port->state->xmit; | |
256 | int count; | |
257 | ||
258 | if (port->x_char) { | |
259 | serial_out(port, SPRD_TXD, port->x_char); | |
260 | port->icount.tx++; | |
261 | port->x_char = 0; | |
262 | return; | |
263 | } | |
264 | ||
265 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
266 | sprd_stop_tx(port); | |
267 | return; | |
268 | } | |
269 | ||
270 | count = THLD_TX_EMPTY; | |
271 | do { | |
272 | serial_out(port, SPRD_TXD, xmit->buf[xmit->tail]); | |
273 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
274 | port->icount.tx++; | |
275 | if (uart_circ_empty(xmit)) | |
276 | break; | |
277 | } while (--count > 0); | |
278 | ||
279 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
280 | uart_write_wakeup(port); | |
281 | ||
282 | if (uart_circ_empty(xmit)) | |
283 | sprd_stop_tx(port); | |
284 | } | |
285 | ||
286 | /* this handles the interrupt from one port */ | |
287 | static irqreturn_t sprd_handle_irq(int irq, void *dev_id) | |
288 | { | |
289 | struct uart_port *port = dev_id; | |
290 | unsigned int ims; | |
291 | ||
292 | spin_lock(&port->lock); | |
293 | ||
294 | ims = serial_in(port, SPRD_IMSR); | |
295 | ||
296 | if (!ims) | |
297 | return IRQ_NONE; | |
298 | ||
299 | serial_out(port, SPRD_ICLR, ~0); | |
300 | ||
301 | if (ims & (SPRD_IMSR_RX_FIFO_FULL | | |
302 | SPRD_IMSR_BREAK_DETECT | SPRD_IMSR_TIMEOUT)) | |
303 | sprd_rx(port); | |
304 | ||
305 | if (ims & SPRD_IMSR_TX_FIFO_EMPTY) | |
306 | sprd_tx(port); | |
307 | ||
308 | spin_unlock(&port->lock); | |
309 | ||
310 | return IRQ_HANDLED; | |
311 | } | |
312 | ||
313 | static int sprd_startup(struct uart_port *port) | |
314 | { | |
315 | int ret = 0; | |
316 | unsigned int ien, fc; | |
317 | unsigned int timeout; | |
318 | struct sprd_uart_port *sp; | |
319 | unsigned long flags; | |
320 | ||
321 | serial_out(port, SPRD_CTL2, ((THLD_TX_EMPTY << 8) | THLD_RX_FULL)); | |
322 | ||
323 | /* clear rx fifo */ | |
324 | timeout = SPRD_TIMEOUT; | |
325 | while (timeout-- && serial_in(port, SPRD_STS1) & 0x00ff) | |
326 | serial_in(port, SPRD_RXD); | |
327 | ||
328 | /* clear tx fifo */ | |
329 | timeout = SPRD_TIMEOUT; | |
330 | while (timeout-- && serial_in(port, SPRD_STS1) & 0xff00) | |
331 | cpu_relax(); | |
332 | ||
333 | /* clear interrupt */ | |
334 | serial_out(port, SPRD_IEN, 0); | |
335 | serial_out(port, SPRD_ICLR, ~0); | |
336 | ||
337 | /* allocate irq */ | |
338 | sp = container_of(port, struct sprd_uart_port, port); | |
339 | snprintf(sp->name, sizeof(sp->name), "sprd_serial%d", port->line); | |
340 | ret = devm_request_irq(port->dev, port->irq, sprd_handle_irq, | |
341 | IRQF_SHARED, sp->name, port); | |
342 | if (ret) { | |
343 | dev_err(port->dev, "fail to request serial irq %d, ret=%d\n", | |
344 | port->irq, ret); | |
345 | return ret; | |
346 | } | |
347 | fc = serial_in(port, SPRD_CTL1); | |
348 | fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF; | |
349 | serial_out(port, SPRD_CTL1, fc); | |
350 | ||
351 | /* enable interrupt */ | |
352 | spin_lock_irqsave(&port->lock, flags); | |
353 | ien = serial_in(port, SPRD_IEN); | |
354 | ien |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT | SPRD_IEN_TIMEOUT; | |
355 | serial_out(port, SPRD_IEN, ien); | |
356 | spin_unlock_irqrestore(&port->lock, flags); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static void sprd_shutdown(struct uart_port *port) | |
362 | { | |
363 | serial_out(port, SPRD_IEN, 0); | |
364 | serial_out(port, SPRD_ICLR, ~0); | |
365 | devm_free_irq(port->dev, port->irq, port); | |
366 | } | |
367 | ||
368 | static void sprd_set_termios(struct uart_port *port, | |
369 | struct ktermios *termios, | |
370 | struct ktermios *old) | |
371 | { | |
372 | unsigned int baud, quot; | |
373 | unsigned int lcr = 0, fc; | |
374 | unsigned long flags; | |
375 | ||
376 | /* ask the core to calculate the divisor for us */ | |
377 | baud = uart_get_baud_rate(port, termios, old, 0, SPRD_BAUD_IO_LIMIT); | |
378 | ||
379 | quot = (unsigned int)((port->uartclk + baud / 2) / baud); | |
380 | ||
381 | /* set data length */ | |
382 | switch (termios->c_cflag & CSIZE) { | |
383 | case CS5: | |
384 | lcr |= SPRD_LCR_DATA_LEN5; | |
385 | break; | |
386 | case CS6: | |
387 | lcr |= SPRD_LCR_DATA_LEN6; | |
388 | break; | |
389 | case CS7: | |
390 | lcr |= SPRD_LCR_DATA_LEN7; | |
391 | break; | |
392 | case CS8: | |
393 | default: | |
394 | lcr |= SPRD_LCR_DATA_LEN8; | |
395 | break; | |
396 | } | |
397 | ||
398 | /* calculate stop bits */ | |
399 | lcr &= ~(SPRD_LCR_STOP_1BIT | SPRD_LCR_STOP_2BIT); | |
400 | if (termios->c_cflag & CSTOPB) | |
401 | lcr |= SPRD_LCR_STOP_2BIT; | |
402 | else | |
403 | lcr |= SPRD_LCR_STOP_1BIT; | |
404 | ||
405 | /* calculate parity */ | |
406 | lcr &= ~SPRD_LCR_PARITY; | |
407 | termios->c_cflag &= ~CMSPAR; /* no support mark/space */ | |
408 | if (termios->c_cflag & PARENB) { | |
409 | lcr |= SPRD_LCR_PARITY_EN; | |
410 | if (termios->c_cflag & PARODD) | |
411 | lcr |= SPRD_LCR_ODD_PAR; | |
412 | else | |
413 | lcr |= SPRD_LCR_EVEN_PAR; | |
414 | } | |
415 | ||
416 | spin_lock_irqsave(&port->lock, flags); | |
417 | ||
418 | /* update the per-port timeout */ | |
419 | uart_update_timeout(port, termios->c_cflag, baud); | |
420 | ||
421 | port->read_status_mask = SPRD_LSR_OE; | |
422 | if (termios->c_iflag & INPCK) | |
423 | port->read_status_mask |= SPRD_LSR_FE | SPRD_LSR_PE; | |
424 | if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) | |
425 | port->read_status_mask |= SPRD_LSR_BI; | |
426 | ||
427 | /* characters to ignore */ | |
428 | port->ignore_status_mask = 0; | |
429 | if (termios->c_iflag & IGNPAR) | |
430 | port->ignore_status_mask |= SPRD_LSR_PE | SPRD_LSR_FE; | |
431 | if (termios->c_iflag & IGNBRK) { | |
432 | port->ignore_status_mask |= SPRD_LSR_BI; | |
433 | /* | |
434 | * If we're ignoring parity and break indicators, | |
435 | * ignore overruns too (for real raw support). | |
436 | */ | |
437 | if (termios->c_iflag & IGNPAR) | |
438 | port->ignore_status_mask |= SPRD_LSR_OE; | |
439 | } | |
440 | ||
441 | /* flow control */ | |
442 | fc = serial_in(port, SPRD_CTL1); | |
443 | fc &= ~(RX_HW_FLOW_CTL_THLD | RX_HW_FLOW_CTL_EN | TX_HW_FLOW_CTL_EN); | |
444 | if (termios->c_cflag & CRTSCTS) { | |
445 | fc |= RX_HW_FLOW_CTL_THLD; | |
446 | fc |= RX_HW_FLOW_CTL_EN; | |
447 | fc |= TX_HW_FLOW_CTL_EN; | |
448 | } | |
449 | ||
450 | /* clock divider bit0~bit15 */ | |
451 | serial_out(port, SPRD_CLKD0, quot & 0xffff); | |
452 | ||
453 | /* clock divider bit16~bit20 */ | |
454 | serial_out(port, SPRD_CLKD1, (quot & 0x1f0000) >> 16); | |
455 | serial_out(port, SPRD_LCR, lcr); | |
456 | fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF; | |
457 | serial_out(port, SPRD_CTL1, fc); | |
458 | ||
459 | spin_unlock_irqrestore(&port->lock, flags); | |
460 | ||
461 | /* Don't rewrite B0 */ | |
462 | if (tty_termios_baud_rate(termios)) | |
463 | tty_termios_encode_baud_rate(termios, baud, baud); | |
464 | } | |
465 | ||
466 | static const char *sprd_type(struct uart_port *port) | |
467 | { | |
468 | return "SPX"; | |
469 | } | |
470 | ||
471 | static void sprd_release_port(struct uart_port *port) | |
472 | { | |
473 | /* nothing to do */ | |
474 | } | |
475 | ||
476 | static int sprd_request_port(struct uart_port *port) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static void sprd_config_port(struct uart_port *port, int flags) | |
482 | { | |
483 | if (flags & UART_CONFIG_TYPE) | |
484 | port->type = PORT_SPRD; | |
485 | } | |
486 | ||
487 | static int sprd_verify_port(struct uart_port *port, | |
488 | struct serial_struct *ser) | |
489 | { | |
490 | if (ser->type != PORT_SPRD) | |
491 | return -EINVAL; | |
492 | if (port->irq != ser->irq) | |
493 | return -EINVAL; | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static struct uart_ops serial_sprd_ops = { | |
498 | .tx_empty = sprd_tx_empty, | |
499 | .get_mctrl = sprd_get_mctrl, | |
500 | .set_mctrl = sprd_set_mctrl, | |
501 | .stop_tx = sprd_stop_tx, | |
502 | .start_tx = sprd_start_tx, | |
503 | .stop_rx = sprd_stop_rx, | |
504 | .break_ctl = sprd_break_ctl, | |
505 | .startup = sprd_startup, | |
506 | .shutdown = sprd_shutdown, | |
507 | .set_termios = sprd_set_termios, | |
508 | .type = sprd_type, | |
509 | .release_port = sprd_release_port, | |
510 | .request_port = sprd_request_port, | |
511 | .config_port = sprd_config_port, | |
512 | .verify_port = sprd_verify_port, | |
513 | }; | |
514 | ||
515 | #ifdef CONFIG_SERIAL_SPRD_CONSOLE | |
516 | static inline void wait_for_xmitr(struct uart_port *port) | |
517 | { | |
518 | unsigned int status, tmout = 10000; | |
519 | ||
520 | /* wait up to 10ms for the character(s) to be sent */ | |
521 | do { | |
522 | status = serial_in(port, SPRD_STS1); | |
523 | if (--tmout == 0) | |
524 | break; | |
525 | udelay(1); | |
526 | } while (status & 0xff00); | |
527 | } | |
528 | ||
529 | static void sprd_console_putchar(struct uart_port *port, int ch) | |
530 | { | |
531 | wait_for_xmitr(port); | |
532 | serial_out(port, SPRD_TXD, ch); | |
533 | } | |
534 | ||
535 | static void sprd_console_write(struct console *co, const char *s, | |
536 | unsigned int count) | |
537 | { | |
538 | struct uart_port *port = &sprd_port[co->index]->port; | |
539 | int locked = 1; | |
540 | unsigned long flags; | |
541 | ||
542 | if (port->sysrq) | |
543 | locked = 0; | |
544 | else if (oops_in_progress) | |
545 | locked = spin_trylock_irqsave(&port->lock, flags); | |
546 | else | |
547 | spin_lock_irqsave(&port->lock, flags); | |
548 | ||
549 | uart_console_write(port, s, count, sprd_console_putchar); | |
550 | ||
551 | /* wait for transmitter to become empty */ | |
552 | wait_for_xmitr(port); | |
553 | ||
554 | if (locked) | |
555 | spin_unlock_irqrestore(&port->lock, flags); | |
556 | } | |
557 | ||
558 | static int __init sprd_console_setup(struct console *co, char *options) | |
559 | { | |
560 | struct uart_port *port; | |
561 | int baud = 115200; | |
562 | int bits = 8; | |
563 | int parity = 'n'; | |
564 | int flow = 'n'; | |
565 | ||
566 | if (co->index >= UART_NR_MAX || co->index < 0) | |
567 | co->index = 0; | |
568 | ||
569 | port = &sprd_port[co->index]->port; | |
570 | if (port == NULL) { | |
571 | pr_info("serial port %d not yet initialized\n", co->index); | |
572 | return -ENODEV; | |
573 | } | |
574 | if (options) | |
575 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
576 | ||
577 | return uart_set_options(port, co, baud, parity, bits, flow); | |
578 | } | |
579 | ||
580 | static struct uart_driver sprd_uart_driver; | |
581 | static struct console sprd_console = { | |
582 | .name = SPRD_TTY_NAME, | |
583 | .write = sprd_console_write, | |
584 | .device = uart_console_device, | |
585 | .setup = sprd_console_setup, | |
586 | .flags = CON_PRINTBUFFER, | |
587 | .index = -1, | |
588 | .data = &sprd_uart_driver, | |
589 | }; | |
590 | ||
591 | #define SPRD_CONSOLE (&sprd_console) | |
592 | ||
593 | /* Support for earlycon */ | |
594 | static void sprd_putc(struct uart_port *port, int c) | |
595 | { | |
596 | unsigned int timeout = SPRD_TIMEOUT; | |
597 | ||
598 | while (timeout-- && | |
599 | !(readl(port->membase + SPRD_LSR) & SPRD_LSR_TX_OVER)) | |
600 | cpu_relax(); | |
601 | ||
602 | writeb(c, port->membase + SPRD_TXD); | |
603 | } | |
604 | ||
605 | static void sprd_early_write(struct console *con, const char *s, | |
606 | unsigned n) | |
607 | { | |
608 | struct earlycon_device *dev = con->data; | |
609 | ||
610 | uart_console_write(&dev->port, s, n, sprd_putc); | |
611 | } | |
612 | ||
613 | static int __init sprd_early_console_setup( | |
614 | struct earlycon_device *device, | |
615 | const char *opt) | |
616 | { | |
617 | if (!device->port.membase) | |
618 | return -ENODEV; | |
619 | ||
620 | device->con->write = sprd_early_write; | |
621 | return 0; | |
622 | } | |
623 | ||
624 | EARLYCON_DECLARE(sprd_serial, sprd_early_console_setup); | |
625 | OF_EARLYCON_DECLARE(sprd_serial, "sprd,sc9836-uart", | |
626 | sprd_early_console_setup); | |
627 | ||
628 | #else /* !CONFIG_SERIAL_SPRD_CONSOLE */ | |
629 | #define SPRD_CONSOLE NULL | |
630 | #endif | |
631 | ||
632 | static struct uart_driver sprd_uart_driver = { | |
633 | .owner = THIS_MODULE, | |
634 | .driver_name = "sprd_serial", | |
635 | .dev_name = SPRD_TTY_NAME, | |
636 | .major = 0, | |
637 | .minor = 0, | |
638 | .nr = UART_NR_MAX, | |
639 | .cons = SPRD_CONSOLE, | |
640 | }; | |
641 | ||
642 | static int sprd_probe_dt_alias(int index, struct device *dev) | |
643 | { | |
644 | struct device_node *np; | |
645 | int ret = index; | |
646 | ||
647 | if (!IS_ENABLED(CONFIG_OF)) | |
648 | return ret; | |
649 | ||
650 | np = dev->of_node; | |
651 | if (!np) | |
652 | return ret; | |
653 | ||
654 | ret = of_alias_get_id(np, "serial"); | |
655 | if (IS_ERR_VALUE(ret)) | |
656 | ret = index; | |
657 | else if (ret >= ARRAY_SIZE(sprd_port) || sprd_port[ret] != NULL) { | |
658 | dev_warn(dev, "requested serial port %d not available.\n", ret); | |
659 | ret = index; | |
660 | } | |
661 | ||
662 | return ret; | |
663 | } | |
664 | ||
665 | static int sprd_remove(struct platform_device *dev) | |
666 | { | |
667 | struct sprd_uart_port *sup = platform_get_drvdata(dev); | |
668 | ||
669 | if (sup) { | |
670 | uart_remove_one_port(&sprd_uart_driver, &sup->port); | |
671 | sprd_port[sup->port.line] = NULL; | |
672 | sprd_ports_num--; | |
673 | } | |
674 | ||
675 | if (!sprd_ports_num) | |
676 | uart_unregister_driver(&sprd_uart_driver); | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | static int sprd_probe(struct platform_device *pdev) | |
682 | { | |
683 | struct resource *res; | |
684 | struct uart_port *up; | |
685 | struct clk *clk; | |
686 | int irq; | |
687 | int index; | |
688 | int ret; | |
689 | ||
690 | for (index = 0; index < ARRAY_SIZE(sprd_port); index++) | |
691 | if (sprd_port[index] == NULL) | |
692 | break; | |
693 | ||
694 | if (index == ARRAY_SIZE(sprd_port)) | |
695 | return -EBUSY; | |
696 | ||
697 | index = sprd_probe_dt_alias(index, &pdev->dev); | |
698 | ||
699 | sprd_port[index] = devm_kzalloc(&pdev->dev, | |
700 | sizeof(*sprd_port[index]), GFP_KERNEL); | |
701 | if (!sprd_port[index]) | |
702 | return -ENOMEM; | |
703 | ||
704 | up = &sprd_port[index]->port; | |
705 | up->dev = &pdev->dev; | |
706 | up->line = index; | |
707 | up->type = PORT_SPRD; | |
708 | up->iotype = SERIAL_IO_PORT; | |
709 | up->uartclk = SPRD_DEF_RATE; | |
710 | up->fifosize = SPRD_FIFO_SIZE; | |
711 | up->ops = &serial_sprd_ops; | |
712 | up->flags = UPF_BOOT_AUTOCONF; | |
713 | ||
714 | clk = devm_clk_get(&pdev->dev, NULL); | |
715 | if (!IS_ERR(clk)) | |
716 | up->uartclk = clk_get_rate(clk); | |
717 | ||
718 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
719 | if (!res) { | |
720 | dev_err(&pdev->dev, "not provide mem resource\n"); | |
721 | return -ENODEV; | |
722 | } | |
723 | up->mapbase = res->start; | |
724 | up->membase = devm_ioremap_resource(&pdev->dev, res); | |
725 | if (IS_ERR(up->membase)) | |
726 | return PTR_ERR(up->membase); | |
727 | ||
728 | irq = platform_get_irq(pdev, 0); | |
729 | if (irq < 0) { | |
730 | dev_err(&pdev->dev, "not provide irq resource\n"); | |
731 | return -ENODEV; | |
732 | } | |
733 | up->irq = irq; | |
734 | ||
735 | if (!sprd_ports_num) { | |
736 | ret = uart_register_driver(&sprd_uart_driver); | |
737 | if (ret < 0) { | |
738 | pr_err("Failed to register SPRD-UART driver\n"); | |
739 | return ret; | |
740 | } | |
741 | } | |
742 | sprd_ports_num++; | |
743 | ||
744 | ret = uart_add_one_port(&sprd_uart_driver, up); | |
745 | if (ret) { | |
746 | sprd_port[index] = NULL; | |
747 | sprd_remove(pdev); | |
748 | } | |
749 | ||
750 | platform_set_drvdata(pdev, up); | |
751 | ||
752 | return ret; | |
753 | } | |
754 | ||
755 | static int sprd_suspend(struct device *dev) | |
756 | { | |
757 | struct sprd_uart_port *sup = dev_get_drvdata(dev); | |
758 | ||
759 | uart_suspend_port(&sprd_uart_driver, &sup->port); | |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | static int sprd_resume(struct device *dev) | |
765 | { | |
766 | struct sprd_uart_port *sup = dev_get_drvdata(dev); | |
767 | ||
768 | uart_resume_port(&sprd_uart_driver, &sup->port); | |
769 | ||
770 | return 0; | |
771 | } | |
772 | ||
773 | static SIMPLE_DEV_PM_OPS(sprd_pm_ops, sprd_suspend, sprd_resume); | |
774 | ||
775 | static const struct of_device_id serial_ids[] = { | |
776 | {.compatible = "sprd,sc9836-uart",}, | |
777 | {} | |
778 | }; | |
779 | ||
780 | static struct platform_driver sprd_platform_driver = { | |
781 | .probe = sprd_probe, | |
782 | .remove = sprd_remove, | |
783 | .driver = { | |
784 | .name = "sprd_serial", | |
785 | .of_match_table = of_match_ptr(serial_ids), | |
786 | .pm = &sprd_pm_ops, | |
787 | }, | |
788 | }; | |
789 | ||
790 | module_platform_driver(sprd_platform_driver); | |
791 | ||
792 | MODULE_LICENSE("GPL v2"); | |
793 | MODULE_DESCRIPTION("Spreadtrum SoC serial driver series"); |