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[deliverable/linux.git] / drivers / tty / serial / samsung.c
1 /*
2 * Driver core for Samsung SoC onboard UARTs.
3 *
4 * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
5 * http://armlinux.simtec.co.uk/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 /* Hote on 2410 error handling
13 *
14 * The s3c2410 manual has a love/hate affair with the contents of the
15 * UERSTAT register in the UART blocks, and keeps marking some of the
16 * error bits as reserved. Having checked with the s3c2410x01,
17 * it copes with BREAKs properly, so I am happy to ignore the RESERVED
18 * feature from the latter versions of the manual.
19 *
20 * If it becomes aparrent that latter versions of the 2410 remove these
21 * bits, then action will have to be taken to differentiate the versions
22 * and change the policy on BREAK
23 *
24 * BJD, 04-Nov-2004
25 */
26
27 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
28 #define SUPPORT_SYSRQ
29 #endif
30
31 #include <linux/dmaengine.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/slab.h>
34 #include <linux/module.h>
35 #include <linux/ioport.h>
36 #include <linux/io.h>
37 #include <linux/platform_device.h>
38 #include <linux/init.h>
39 #include <linux/sysrq.h>
40 #include <linux/console.h>
41 #include <linux/tty.h>
42 #include <linux/tty_flip.h>
43 #include <linux/serial_core.h>
44 #include <linux/serial.h>
45 #include <linux/serial_s3c.h>
46 #include <linux/delay.h>
47 #include <linux/clk.h>
48 #include <linux/cpufreq.h>
49 #include <linux/of.h>
50
51 #include <asm/irq.h>
52
53 #include "samsung.h"
54
55 #if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \
56 defined(CONFIG_DEBUG_LL) && \
57 !defined(MODULE)
58
59 extern void printascii(const char *);
60
61 __printf(1, 2)
62 static void dbg(const char *fmt, ...)
63 {
64 va_list va;
65 char buff[256];
66
67 va_start(va, fmt);
68 vscnprintf(buff, sizeof(buff), fmt, va);
69 va_end(va);
70
71 printascii(buff);
72 }
73
74 #else
75 #define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0)
76 #endif
77
78 /* UART name and device definitions */
79
80 #define S3C24XX_SERIAL_NAME "ttySAC"
81 #define S3C24XX_SERIAL_MAJOR 204
82 #define S3C24XX_SERIAL_MINOR 64
83
84 #define S3C24XX_TX_PIO 1
85 #define S3C24XX_TX_DMA 2
86 #define S3C24XX_RX_PIO 1
87 #define S3C24XX_RX_DMA 2
88 /* macros to change one thing to another */
89
90 #define tx_enabled(port) ((port)->unused[0])
91 #define rx_enabled(port) ((port)->unused[1])
92
93 /* flag to ignore all characters coming in */
94 #define RXSTAT_DUMMY_READ (0x10000000)
95
96 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
97 {
98 return container_of(port, struct s3c24xx_uart_port, port);
99 }
100
101 /* translate a port to the device name */
102
103 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
104 {
105 return to_platform_device(port->dev)->name;
106 }
107
108 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
109 {
110 return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
111 }
112
113 /*
114 * s3c64xx and later SoC's include the interrupt mask and status registers in
115 * the controller itself, unlike the s3c24xx SoC's which have these registers
116 * in the interrupt controller. Check if the port type is s3c64xx or higher.
117 */
118 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
119 {
120 return to_ourport(port)->info->type == PORT_S3C6400;
121 }
122
123 static void s3c24xx_serial_rx_enable(struct uart_port *port)
124 {
125 unsigned long flags;
126 unsigned int ucon, ufcon;
127 int count = 10000;
128
129 spin_lock_irqsave(&port->lock, flags);
130
131 while (--count && !s3c24xx_serial_txempty_nofifo(port))
132 udelay(100);
133
134 ufcon = rd_regl(port, S3C2410_UFCON);
135 ufcon |= S3C2410_UFCON_RESETRX;
136 wr_regl(port, S3C2410_UFCON, ufcon);
137
138 ucon = rd_regl(port, S3C2410_UCON);
139 ucon |= S3C2410_UCON_RXIRQMODE;
140 wr_regl(port, S3C2410_UCON, ucon);
141
142 rx_enabled(port) = 1;
143 spin_unlock_irqrestore(&port->lock, flags);
144 }
145
146 static void s3c24xx_serial_rx_disable(struct uart_port *port)
147 {
148 unsigned long flags;
149 unsigned int ucon;
150
151 spin_lock_irqsave(&port->lock, flags);
152
153 ucon = rd_regl(port, S3C2410_UCON);
154 ucon &= ~S3C2410_UCON_RXIRQMODE;
155 wr_regl(port, S3C2410_UCON, ucon);
156
157 rx_enabled(port) = 0;
158 spin_unlock_irqrestore(&port->lock, flags);
159 }
160
161 static void s3c24xx_serial_stop_tx(struct uart_port *port)
162 {
163 struct s3c24xx_uart_port *ourport = to_ourport(port);
164 struct s3c24xx_uart_dma *dma = ourport->dma;
165 struct circ_buf *xmit = &port->state->xmit;
166 struct dma_tx_state state;
167 int count;
168
169 if (!tx_enabled(port))
170 return;
171
172 if (s3c24xx_serial_has_interrupt_mask(port))
173 __set_bit(S3C64XX_UINTM_TXD,
174 portaddrl(port, S3C64XX_UINTM));
175 else
176 disable_irq_nosync(ourport->tx_irq);
177
178 if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
179 dmaengine_pause(dma->tx_chan);
180 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
181 dmaengine_terminate_all(dma->tx_chan);
182 dma_sync_single_for_cpu(ourport->port.dev,
183 dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
184 async_tx_ack(dma->tx_desc);
185 count = dma->tx_bytes_requested - state.residue;
186 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
187 port->icount.tx += count;
188 }
189
190 tx_enabled(port) = 0;
191 ourport->tx_in_progress = 0;
192
193 if (port->flags & UPF_CONS_FLOW)
194 s3c24xx_serial_rx_enable(port);
195
196 ourport->tx_mode = 0;
197 }
198
199 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
200
201 static void s3c24xx_serial_tx_dma_complete(void *args)
202 {
203 struct s3c24xx_uart_port *ourport = args;
204 struct uart_port *port = &ourport->port;
205 struct circ_buf *xmit = &port->state->xmit;
206 struct s3c24xx_uart_dma *dma = ourport->dma;
207 struct dma_tx_state state;
208 unsigned long flags;
209 int count;
210
211
212 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
213 count = dma->tx_bytes_requested - state.residue;
214 async_tx_ack(dma->tx_desc);
215
216 dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
217 dma->tx_size, DMA_TO_DEVICE);
218
219 spin_lock_irqsave(&port->lock, flags);
220
221 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
222 port->icount.tx += count;
223 ourport->tx_in_progress = 0;
224
225 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
226 uart_write_wakeup(port);
227
228 s3c24xx_serial_start_next_tx(ourport);
229 spin_unlock_irqrestore(&port->lock, flags);
230 }
231
232 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
233 {
234 struct uart_port *port = &ourport->port;
235 u32 ucon;
236
237 /* Mask Tx interrupt */
238 if (s3c24xx_serial_has_interrupt_mask(port))
239 __set_bit(S3C64XX_UINTM_TXD,
240 portaddrl(port, S3C64XX_UINTM));
241 else
242 disable_irq_nosync(ourport->tx_irq);
243
244 /* Enable tx dma mode */
245 ucon = rd_regl(port, S3C2410_UCON);
246 ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
247 ucon |= (dma_get_cache_alignment() >= 16) ?
248 S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
249 ucon |= S3C64XX_UCON_TXMODE_DMA;
250 wr_regl(port, S3C2410_UCON, ucon);
251
252 ourport->tx_mode = S3C24XX_TX_DMA;
253 }
254
255 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
256 {
257 struct uart_port *port = &ourport->port;
258 u32 ucon, ufcon;
259
260 /* Set ufcon txtrig */
261 ourport->tx_in_progress = S3C24XX_TX_PIO;
262 ufcon = rd_regl(port, S3C2410_UFCON);
263 wr_regl(port, S3C2410_UFCON, ufcon);
264
265 /* Enable tx pio mode */
266 ucon = rd_regl(port, S3C2410_UCON);
267 ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
268 ucon |= S3C64XX_UCON_TXMODE_CPU;
269 wr_regl(port, S3C2410_UCON, ucon);
270
271 /* Unmask Tx interrupt */
272 if (s3c24xx_serial_has_interrupt_mask(port))
273 __clear_bit(S3C64XX_UINTM_TXD,
274 portaddrl(port, S3C64XX_UINTM));
275 else
276 enable_irq(ourport->tx_irq);
277
278 ourport->tx_mode = S3C24XX_TX_PIO;
279 }
280
281 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
282 {
283 if (ourport->tx_mode != S3C24XX_TX_PIO)
284 enable_tx_pio(ourport);
285 }
286
287 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
288 unsigned int count)
289 {
290 struct uart_port *port = &ourport->port;
291 struct circ_buf *xmit = &port->state->xmit;
292 struct s3c24xx_uart_dma *dma = ourport->dma;
293
294
295 if (ourport->tx_mode != S3C24XX_TX_DMA)
296 enable_tx_dma(ourport);
297
298 while (xmit->tail & (dma_get_cache_alignment() - 1)) {
299 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
300 return 0;
301 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
302 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
303 port->icount.tx++;
304 count--;
305 }
306
307 dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
308 dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
309
310 dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
311 dma->tx_size, DMA_TO_DEVICE);
312
313 dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
314 dma->tx_transfer_addr, dma->tx_size,
315 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
316 if (!dma->tx_desc) {
317 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
318 return -EIO;
319 }
320
321 dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
322 dma->tx_desc->callback_param = ourport;
323 dma->tx_bytes_requested = dma->tx_size;
324
325 ourport->tx_in_progress = S3C24XX_TX_DMA;
326 dma->tx_cookie = dmaengine_submit(dma->tx_desc);
327 dma_async_issue_pending(dma->tx_chan);
328 return 0;
329 }
330
331 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
332 {
333 struct uart_port *port = &ourport->port;
334 struct circ_buf *xmit = &port->state->xmit;
335 unsigned long count;
336
337 /* Get data size up to the end of buffer */
338 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
339
340 if (!count) {
341 s3c24xx_serial_stop_tx(port);
342 return;
343 }
344
345 if (!ourport->dma || !ourport->dma->tx_chan || count < port->fifosize)
346 s3c24xx_serial_start_tx_pio(ourport);
347 else
348 s3c24xx_serial_start_tx_dma(ourport, count);
349 }
350
351 void s3c24xx_serial_start_tx(struct uart_port *port)
352 {
353 struct s3c24xx_uart_port *ourport = to_ourport(port);
354 struct circ_buf *xmit = &port->state->xmit;
355
356 if (!tx_enabled(port)) {
357 if (port->flags & UPF_CONS_FLOW)
358 s3c24xx_serial_rx_disable(port);
359
360 tx_enabled(port) = 1;
361 if (!ourport->dma || !ourport->dma->tx_chan)
362 s3c24xx_serial_start_tx_pio(ourport);
363 }
364
365 if (ourport->dma && ourport->dma->tx_chan) {
366 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
367 s3c24xx_serial_start_next_tx(ourport);
368 }
369 }
370
371 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
372 struct tty_port *tty, int count)
373 {
374 struct s3c24xx_uart_dma *dma = ourport->dma;
375 int copied;
376
377 if (!count)
378 return;
379
380 dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
381 dma->rx_size, DMA_FROM_DEVICE);
382
383 ourport->port.icount.rx += count;
384 if (!tty) {
385 dev_err(ourport->port.dev, "No tty port\n");
386 return;
387 }
388 copied = tty_insert_flip_string(tty,
389 ((unsigned char *)(ourport->dma->rx_buf)), count);
390 if (copied != count) {
391 WARN_ON(1);
392 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
393 }
394 }
395
396 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
397 unsigned long ufstat);
398
399 static void uart_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
400 {
401 struct uart_port *port = &ourport->port;
402 struct tty_port *tty = &port->state->port;
403 unsigned int ch, ufstat;
404 unsigned int count;
405
406 ufstat = rd_regl(port, S3C2410_UFSTAT);
407 count = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
408
409 if (!count)
410 return;
411
412 while (count-- > 0) {
413 ch = rd_regb(port, S3C2410_URXH);
414
415 ourport->port.icount.rx++;
416 tty_insert_flip_char(tty, ch, TTY_NORMAL);
417 }
418
419 tty_flip_buffer_push(tty);
420 }
421
422 static void s3c24xx_serial_stop_rx(struct uart_port *port)
423 {
424 struct s3c24xx_uart_port *ourport = to_ourport(port);
425 struct s3c24xx_uart_dma *dma = ourport->dma;
426 struct tty_port *t = &port->state->port;
427 struct dma_tx_state state;
428 enum dma_status dma_status;
429 unsigned int received;
430
431 if (rx_enabled(port)) {
432 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
433 if (s3c24xx_serial_has_interrupt_mask(port))
434 __set_bit(S3C64XX_UINTM_RXD,
435 portaddrl(port, S3C64XX_UINTM));
436 else
437 disable_irq_nosync(ourport->rx_irq);
438 rx_enabled(port) = 0;
439 }
440 if (dma && dma->rx_chan) {
441 dmaengine_pause(dma->tx_chan);
442 dma_status = dmaengine_tx_status(dma->rx_chan,
443 dma->rx_cookie, &state);
444 if (dma_status == DMA_IN_PROGRESS ||
445 dma_status == DMA_PAUSED) {
446 received = dma->rx_bytes_requested - state.residue;
447 dmaengine_terminate_all(dma->rx_chan);
448 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
449 }
450 }
451 }
452
453 static inline struct s3c24xx_uart_info
454 *s3c24xx_port_to_info(struct uart_port *port)
455 {
456 return to_ourport(port)->info;
457 }
458
459 static inline struct s3c2410_uartcfg
460 *s3c24xx_port_to_cfg(struct uart_port *port)
461 {
462 struct s3c24xx_uart_port *ourport;
463
464 if (port->dev == NULL)
465 return NULL;
466
467 ourport = container_of(port, struct s3c24xx_uart_port, port);
468 return ourport->cfg;
469 }
470
471 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
472 unsigned long ufstat)
473 {
474 struct s3c24xx_uart_info *info = ourport->info;
475
476 if (ufstat & info->rx_fifofull)
477 return ourport->port.fifosize;
478
479 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
480 }
481
482 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
483 static void s3c24xx_serial_rx_dma_complete(void *args)
484 {
485 struct s3c24xx_uart_port *ourport = args;
486 struct uart_port *port = &ourport->port;
487
488 struct s3c24xx_uart_dma *dma = ourport->dma;
489 struct tty_port *t = &port->state->port;
490 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
491
492 struct dma_tx_state state;
493 unsigned long flags;
494 int received;
495
496 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
497 received = dma->rx_bytes_requested - state.residue;
498 async_tx_ack(dma->rx_desc);
499
500 spin_lock_irqsave(&port->lock, flags);
501
502 if (received)
503 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
504
505 if (tty) {
506 tty_flip_buffer_push(t);
507 tty_kref_put(tty);
508 }
509
510 s3c64xx_start_rx_dma(ourport);
511
512 spin_unlock_irqrestore(&port->lock, flags);
513 }
514
515 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
516 {
517 struct s3c24xx_uart_dma *dma = ourport->dma;
518
519 dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
520 dma->rx_size, DMA_FROM_DEVICE);
521
522 dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
523 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
524 DMA_PREP_INTERRUPT);
525 if (!dma->rx_desc) {
526 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
527 return;
528 }
529
530 dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
531 dma->rx_desc->callback_param = ourport;
532 dma->rx_bytes_requested = dma->rx_size;
533
534 dma->rx_cookie = dmaengine_submit(dma->rx_desc);
535 dma_async_issue_pending(dma->rx_chan);
536 }
537
538 /* ? - where has parity gone?? */
539 #define S3C2410_UERSTAT_PARITY (0x1000)
540
541 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
542 {
543 struct uart_port *port = &ourport->port;
544 unsigned int ucon;
545
546 /* set Rx mode to DMA mode */
547 ucon = rd_regl(port, S3C2410_UCON);
548 ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
549 S3C64XX_UCON_TIMEOUT_MASK |
550 S3C64XX_UCON_EMPTYINT_EN |
551 S3C64XX_UCON_DMASUS_EN |
552 S3C64XX_UCON_TIMEOUT_EN |
553 S3C64XX_UCON_RXMODE_MASK);
554 ucon |= S3C64XX_UCON_RXBURST_16 |
555 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
556 S3C64XX_UCON_EMPTYINT_EN |
557 S3C64XX_UCON_TIMEOUT_EN |
558 S3C64XX_UCON_RXMODE_DMA;
559 wr_regl(port, S3C2410_UCON, ucon);
560
561 ourport->rx_mode = S3C24XX_RX_DMA;
562 }
563
564 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
565 {
566 struct uart_port *port = &ourport->port;
567 unsigned int ucon;
568
569 /* set Rx mode to DMA mode */
570 ucon = rd_regl(port, S3C2410_UCON);
571 ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
572 S3C64XX_UCON_EMPTYINT_EN |
573 S3C64XX_UCON_DMASUS_EN |
574 S3C64XX_UCON_TIMEOUT_EN |
575 S3C64XX_UCON_RXMODE_MASK);
576 ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
577 S3C64XX_UCON_TIMEOUT_EN |
578 S3C64XX_UCON_RXMODE_CPU;
579 wr_regl(port, S3C2410_UCON, ucon);
580
581 ourport->rx_mode = S3C24XX_RX_PIO;
582 }
583
584 static irqreturn_t s3c24xx_serial_rx_chars_dma(int irq, void *dev_id)
585 {
586 unsigned int utrstat, ufstat, received;
587 struct s3c24xx_uart_port *ourport = dev_id;
588 struct uart_port *port = &ourport->port;
589 struct s3c24xx_uart_dma *dma = ourport->dma;
590 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
591 struct tty_port *t = &port->state->port;
592 unsigned long flags;
593 struct dma_tx_state state;
594
595 utrstat = rd_regl(port, S3C2410_UTRSTAT);
596 ufstat = rd_regl(port, S3C2410_UFSTAT);
597
598 spin_lock_irqsave(&port->lock, flags);
599
600 if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
601 s3c64xx_start_rx_dma(ourport);
602 if (ourport->rx_mode == S3C24XX_RX_PIO)
603 enable_rx_dma(ourport);
604 goto finish;
605 }
606
607 if (ourport->rx_mode == S3C24XX_RX_DMA) {
608 dmaengine_pause(dma->rx_chan);
609 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
610 dmaengine_terminate_all(dma->rx_chan);
611 received = dma->rx_bytes_requested - state.residue;
612 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
613
614 enable_rx_pio(ourport);
615 }
616
617 uart_rx_drain_fifo(ourport);
618
619 if (tty) {
620 tty_flip_buffer_push(t);
621 tty_kref_put(tty);
622 }
623
624 wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
625
626 finish:
627 spin_unlock_irqrestore(&port->lock, flags);
628
629 return IRQ_HANDLED;
630 }
631
632 static irqreturn_t s3c24xx_serial_rx_chars_pio(int irq, void *dev_id)
633 {
634 struct s3c24xx_uart_port *ourport = dev_id;
635 struct uart_port *port = &ourport->port;
636 unsigned int ufcon, ch, flag, ufstat, uerstat;
637 unsigned long flags;
638 int max_count = port->fifosize;
639
640 spin_lock_irqsave(&port->lock, flags);
641
642 while (max_count-- > 0) {
643 ufcon = rd_regl(port, S3C2410_UFCON);
644 ufstat = rd_regl(port, S3C2410_UFSTAT);
645
646 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
647 break;
648
649 uerstat = rd_regl(port, S3C2410_UERSTAT);
650 ch = rd_regb(port, S3C2410_URXH);
651
652 if (port->flags & UPF_CONS_FLOW) {
653 int txe = s3c24xx_serial_txempty_nofifo(port);
654
655 if (rx_enabled(port)) {
656 if (!txe) {
657 rx_enabled(port) = 0;
658 continue;
659 }
660 } else {
661 if (txe) {
662 ufcon |= S3C2410_UFCON_RESETRX;
663 wr_regl(port, S3C2410_UFCON, ufcon);
664 rx_enabled(port) = 1;
665 spin_unlock_irqrestore(&port->lock,
666 flags);
667 goto out;
668 }
669 continue;
670 }
671 }
672
673 /* insert the character into the buffer */
674
675 flag = TTY_NORMAL;
676 port->icount.rx++;
677
678 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
679 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
680 ch, uerstat);
681
682 /* check for break */
683 if (uerstat & S3C2410_UERSTAT_BREAK) {
684 dbg("break!\n");
685 port->icount.brk++;
686 if (uart_handle_break(port))
687 goto ignore_char;
688 }
689
690 if (uerstat & S3C2410_UERSTAT_FRAME)
691 port->icount.frame++;
692 if (uerstat & S3C2410_UERSTAT_OVERRUN)
693 port->icount.overrun++;
694
695 uerstat &= port->read_status_mask;
696
697 if (uerstat & S3C2410_UERSTAT_BREAK)
698 flag = TTY_BREAK;
699 else if (uerstat & S3C2410_UERSTAT_PARITY)
700 flag = TTY_PARITY;
701 else if (uerstat & (S3C2410_UERSTAT_FRAME |
702 S3C2410_UERSTAT_OVERRUN))
703 flag = TTY_FRAME;
704 }
705
706 if (uart_handle_sysrq_char(port, ch))
707 goto ignore_char;
708
709 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
710 ch, flag);
711
712 ignore_char:
713 continue;
714 }
715
716 spin_unlock_irqrestore(&port->lock, flags);
717 tty_flip_buffer_push(&port->state->port);
718
719 out:
720 return IRQ_HANDLED;
721 }
722
723
724 static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
725 {
726 struct s3c24xx_uart_port *ourport = dev_id;
727
728 if (ourport->dma && ourport->dma->rx_chan)
729 return s3c24xx_serial_rx_chars_dma(irq, dev_id);
730 return s3c24xx_serial_rx_chars_pio(irq, dev_id);
731 }
732
733 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
734 {
735 struct s3c24xx_uart_port *ourport = id;
736 struct uart_port *port = &ourport->port;
737 struct circ_buf *xmit = &port->state->xmit;
738 unsigned long flags;
739 int count;
740
741 spin_lock_irqsave(&port->lock, flags);
742
743 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
744
745 if (ourport->dma && ourport->dma->tx_chan && count >= port->fifosize) {
746 s3c24xx_serial_start_tx_dma(ourport, count);
747 goto out;
748 }
749
750 if (port->x_char) {
751 wr_regb(port, S3C2410_UTXH, port->x_char);
752 port->icount.tx++;
753 port->x_char = 0;
754 goto out;
755 }
756
757 /* if there isn't anything more to transmit, or the uart is now
758 * stopped, disable the uart and exit
759 */
760
761 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
762 s3c24xx_serial_stop_tx(port);
763 goto out;
764 }
765
766 /* try and drain the buffer... */
767
768 count = port->fifosize;
769 while (!uart_circ_empty(xmit) && count-- > 0) {
770 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
771 break;
772
773 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
774 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
775 port->icount.tx++;
776 }
777
778 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
779 spin_unlock(&port->lock);
780 uart_write_wakeup(port);
781 spin_lock(&port->lock);
782 }
783
784 if (uart_circ_empty(xmit))
785 s3c24xx_serial_stop_tx(port);
786
787 out:
788 spin_unlock_irqrestore(&port->lock, flags);
789 return IRQ_HANDLED;
790 }
791
792 /* interrupt handler for s3c64xx and later SoC's.*/
793 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
794 {
795 struct s3c24xx_uart_port *ourport = id;
796 struct uart_port *port = &ourport->port;
797 unsigned int pend = rd_regl(port, S3C64XX_UINTP);
798 irqreturn_t ret = IRQ_HANDLED;
799
800 if (pend & S3C64XX_UINTM_RXD_MSK) {
801 ret = s3c24xx_serial_rx_chars(irq, id);
802 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
803 }
804 if (pend & S3C64XX_UINTM_TXD_MSK) {
805 ret = s3c24xx_serial_tx_chars(irq, id);
806 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
807 }
808 return ret;
809 }
810
811 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
812 {
813 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
814 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
815 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
816
817 if (ufcon & S3C2410_UFCON_FIFOMODE) {
818 if ((ufstat & info->tx_fifomask) != 0 ||
819 (ufstat & info->tx_fifofull))
820 return 0;
821
822 return 1;
823 }
824
825 return s3c24xx_serial_txempty_nofifo(port);
826 }
827
828 /* no modem control lines */
829 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
830 {
831 unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
832
833 if (umstat & S3C2410_UMSTAT_CTS)
834 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
835 else
836 return TIOCM_CAR | TIOCM_DSR;
837 }
838
839 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
840 {
841 unsigned int umcon = rd_regl(port, S3C2410_UMCON);
842
843 if (mctrl & TIOCM_RTS)
844 umcon |= S3C2410_UMCOM_RTS_LOW;
845 else
846 umcon &= ~S3C2410_UMCOM_RTS_LOW;
847
848 wr_regl(port, S3C2410_UMCON, umcon);
849 }
850
851 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
852 {
853 unsigned long flags;
854 unsigned int ucon;
855
856 spin_lock_irqsave(&port->lock, flags);
857
858 ucon = rd_regl(port, S3C2410_UCON);
859
860 if (break_state)
861 ucon |= S3C2410_UCON_SBREAK;
862 else
863 ucon &= ~S3C2410_UCON_SBREAK;
864
865 wr_regl(port, S3C2410_UCON, ucon);
866
867 spin_unlock_irqrestore(&port->lock, flags);
868 }
869
870 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
871 {
872 struct s3c24xx_uart_dma *dma = p->dma;
873 dma_cap_mask_t mask;
874 unsigned long flags;
875
876 /* Default slave configuration parameters */
877 dma->rx_conf.direction = DMA_DEV_TO_MEM;
878 dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
879 dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH;
880 dma->rx_conf.src_maxburst = 16;
881
882 dma->tx_conf.direction = DMA_MEM_TO_DEV;
883 dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
884 dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH;
885 if (dma_get_cache_alignment() >= 16)
886 dma->tx_conf.dst_maxburst = 16;
887 else
888 dma->tx_conf.dst_maxburst = 1;
889
890 dma_cap_zero(mask);
891 dma_cap_set(DMA_SLAVE, mask);
892
893 dma->rx_chan = dma_request_slave_channel_compat(mask, dma->fn,
894 dma->rx_param, p->port.dev, "rx");
895 if (!dma->rx_chan)
896 return -ENODEV;
897
898 dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
899
900 dma->tx_chan = dma_request_slave_channel_compat(mask, dma->fn,
901 dma->tx_param, p->port.dev, "tx");
902 if (!dma->tx_chan) {
903 dma_release_channel(dma->rx_chan);
904 return -ENODEV;
905 }
906
907 dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
908
909 /* RX buffer */
910 dma->rx_size = PAGE_SIZE;
911
912 dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
913
914 if (!dma->rx_buf) {
915 dma_release_channel(dma->rx_chan);
916 dma_release_channel(dma->tx_chan);
917 return -ENOMEM;
918 }
919
920 dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
921 dma->rx_size, DMA_FROM_DEVICE);
922
923 spin_lock_irqsave(&p->port.lock, flags);
924
925 /* TX buffer */
926 dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
927 p->port.state->xmit.buf,
928 UART_XMIT_SIZE, DMA_TO_DEVICE);
929
930 spin_unlock_irqrestore(&p->port.lock, flags);
931
932 return 0;
933 }
934
935 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
936 {
937 struct s3c24xx_uart_dma *dma = p->dma;
938
939 if (dma->rx_chan) {
940 dmaengine_terminate_all(dma->rx_chan);
941 dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
942 dma->rx_size, DMA_FROM_DEVICE);
943 kfree(dma->rx_buf);
944 dma_release_channel(dma->rx_chan);
945 dma->rx_chan = NULL;
946 }
947
948 if (dma->tx_chan) {
949 dmaengine_terminate_all(dma->tx_chan);
950 dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
951 UART_XMIT_SIZE, DMA_TO_DEVICE);
952 dma_release_channel(dma->tx_chan);
953 dma->tx_chan = NULL;
954 }
955 }
956
957 static void s3c24xx_serial_shutdown(struct uart_port *port)
958 {
959 struct s3c24xx_uart_port *ourport = to_ourport(port);
960
961 if (ourport->tx_claimed) {
962 if (!s3c24xx_serial_has_interrupt_mask(port))
963 free_irq(ourport->tx_irq, ourport);
964 tx_enabled(port) = 0;
965 ourport->tx_claimed = 0;
966 ourport->tx_mode = 0;
967 }
968
969 if (ourport->rx_claimed) {
970 if (!s3c24xx_serial_has_interrupt_mask(port))
971 free_irq(ourport->rx_irq, ourport);
972 ourport->rx_claimed = 0;
973 rx_enabled(port) = 0;
974 }
975
976 /* Clear pending interrupts and mask all interrupts */
977 if (s3c24xx_serial_has_interrupt_mask(port)) {
978 free_irq(port->irq, ourport);
979
980 wr_regl(port, S3C64XX_UINTP, 0xf);
981 wr_regl(port, S3C64XX_UINTM, 0xf);
982 }
983
984 if (ourport->dma)
985 s3c24xx_serial_release_dma(ourport);
986
987 ourport->tx_in_progress = 0;
988 }
989
990 static int s3c24xx_serial_startup(struct uart_port *port)
991 {
992 struct s3c24xx_uart_port *ourport = to_ourport(port);
993 int ret;
994
995 dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n",
996 port, (unsigned long long)port->mapbase, port->membase);
997
998 rx_enabled(port) = 1;
999
1000 ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
1001 s3c24xx_serial_portname(port), ourport);
1002
1003 if (ret != 0) {
1004 dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
1005 return ret;
1006 }
1007
1008 ourport->rx_claimed = 1;
1009
1010 dbg("requesting tx irq...\n");
1011
1012 tx_enabled(port) = 1;
1013
1014 ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
1015 s3c24xx_serial_portname(port), ourport);
1016
1017 if (ret) {
1018 dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
1019 goto err;
1020 }
1021
1022 ourport->tx_claimed = 1;
1023
1024 dbg("s3c24xx_serial_startup ok\n");
1025
1026 /* the port reset code should have done the correct
1027 * register setup for the port controls */
1028
1029 return ret;
1030
1031 err:
1032 s3c24xx_serial_shutdown(port);
1033 return ret;
1034 }
1035
1036 static int s3c64xx_serial_startup(struct uart_port *port)
1037 {
1038 struct s3c24xx_uart_port *ourport = to_ourport(port);
1039 unsigned long flags;
1040 unsigned int ufcon;
1041 int ret;
1042
1043 dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
1044 port, (unsigned long long)port->mapbase, port->membase);
1045
1046 wr_regl(port, S3C64XX_UINTM, 0xf);
1047 if (ourport->dma) {
1048 ret = s3c24xx_serial_request_dma(ourport);
1049 if (ret < 0) {
1050 dev_warn(port->dev, "DMA request failed\n");
1051 return ret;
1052 }
1053 }
1054
1055 ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1056 s3c24xx_serial_portname(port), ourport);
1057 if (ret) {
1058 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1059 return ret;
1060 }
1061
1062 /* For compatibility with s3c24xx Soc's */
1063 rx_enabled(port) = 1;
1064 ourport->rx_claimed = 1;
1065 tx_enabled(port) = 0;
1066 ourport->tx_claimed = 1;
1067
1068 spin_lock_irqsave(&port->lock, flags);
1069
1070 ufcon = rd_regl(port, S3C2410_UFCON);
1071 ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1072 if (!uart_console(port))
1073 ufcon |= S3C2410_UFCON_RESETTX;
1074 wr_regl(port, S3C2410_UFCON, ufcon);
1075
1076 enable_rx_pio(ourport);
1077
1078 spin_unlock_irqrestore(&port->lock, flags);
1079
1080 /* Enable Rx Interrupt */
1081 __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM));
1082
1083 dbg("s3c64xx_serial_startup ok\n");
1084 return ret;
1085 }
1086
1087 /* power power management control */
1088
1089 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1090 unsigned int old)
1091 {
1092 struct s3c24xx_uart_port *ourport = to_ourport(port);
1093 int timeout = 10000;
1094
1095 ourport->pm_level = level;
1096
1097 switch (level) {
1098 case 3:
1099 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1100 udelay(100);
1101
1102 if (!IS_ERR(ourport->baudclk))
1103 clk_disable_unprepare(ourport->baudclk);
1104
1105 clk_disable_unprepare(ourport->clk);
1106 break;
1107
1108 case 0:
1109 clk_prepare_enable(ourport->clk);
1110
1111 if (!IS_ERR(ourport->baudclk))
1112 clk_prepare_enable(ourport->baudclk);
1113
1114 break;
1115 default:
1116 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1117 }
1118 }
1119
1120 /* baud rate calculation
1121 *
1122 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1123 * of different sources, including the peripheral clock ("pclk") and an
1124 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1125 * with a programmable extra divisor.
1126 *
1127 * The following code goes through the clock sources, and calculates the
1128 * baud clocks (and the resultant actual baud rates) and then tries to
1129 * pick the closest one and select that.
1130 *
1131 */
1132
1133 #define MAX_CLK_NAME_LENGTH 15
1134
1135 static inline int s3c24xx_serial_getsource(struct uart_port *port)
1136 {
1137 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1138 unsigned int ucon;
1139
1140 if (info->num_clks == 1)
1141 return 0;
1142
1143 ucon = rd_regl(port, S3C2410_UCON);
1144 ucon &= info->clksel_mask;
1145 return ucon >> info->clksel_shift;
1146 }
1147
1148 static void s3c24xx_serial_setsource(struct uart_port *port,
1149 unsigned int clk_sel)
1150 {
1151 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1152 unsigned int ucon;
1153
1154 if (info->num_clks == 1)
1155 return;
1156
1157 ucon = rd_regl(port, S3C2410_UCON);
1158 if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1159 return;
1160
1161 ucon &= ~info->clksel_mask;
1162 ucon |= clk_sel << info->clksel_shift;
1163 wr_regl(port, S3C2410_UCON, ucon);
1164 }
1165
1166 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1167 unsigned int req_baud, struct clk **best_clk,
1168 unsigned int *clk_num)
1169 {
1170 struct s3c24xx_uart_info *info = ourport->info;
1171 struct clk *clk;
1172 unsigned long rate;
1173 unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
1174 char clkname[MAX_CLK_NAME_LENGTH];
1175 int calc_deviation, deviation = (1 << 30) - 1;
1176
1177 clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
1178 ourport->info->def_clk_sel;
1179 for (cnt = 0; cnt < info->num_clks; cnt++) {
1180 if (!(clk_sel & (1 << cnt)))
1181 continue;
1182
1183 sprintf(clkname, "clk_uart_baud%d", cnt);
1184 clk = clk_get(ourport->port.dev, clkname);
1185 if (IS_ERR(clk))
1186 continue;
1187
1188 rate = clk_get_rate(clk);
1189 if (!rate)
1190 continue;
1191
1192 if (ourport->info->has_divslot) {
1193 unsigned long div = rate / req_baud;
1194
1195 /* The UDIVSLOT register on the newer UARTs allows us to
1196 * get a divisor adjustment of 1/16th on the baud clock.
1197 *
1198 * We don't keep the UDIVSLOT value (the 16ths we
1199 * calculated by not multiplying the baud by 16) as it
1200 * is easy enough to recalculate.
1201 */
1202
1203 quot = div / 16;
1204 baud = rate / div;
1205 } else {
1206 quot = (rate + (8 * req_baud)) / (16 * req_baud);
1207 baud = rate / (quot * 16);
1208 }
1209 quot--;
1210
1211 calc_deviation = req_baud - baud;
1212 if (calc_deviation < 0)
1213 calc_deviation = -calc_deviation;
1214
1215 if (calc_deviation < deviation) {
1216 *best_clk = clk;
1217 best_quot = quot;
1218 *clk_num = cnt;
1219 deviation = calc_deviation;
1220 }
1221 }
1222
1223 return best_quot;
1224 }
1225
1226 /* udivslot_table[]
1227 *
1228 * This table takes the fractional value of the baud divisor and gives
1229 * the recommended setting for the UDIVSLOT register.
1230 */
1231 static u16 udivslot_table[16] = {
1232 [0] = 0x0000,
1233 [1] = 0x0080,
1234 [2] = 0x0808,
1235 [3] = 0x0888,
1236 [4] = 0x2222,
1237 [5] = 0x4924,
1238 [6] = 0x4A52,
1239 [7] = 0x54AA,
1240 [8] = 0x5555,
1241 [9] = 0xD555,
1242 [10] = 0xD5D5,
1243 [11] = 0xDDD5,
1244 [12] = 0xDDDD,
1245 [13] = 0xDFDD,
1246 [14] = 0xDFDF,
1247 [15] = 0xFFDF,
1248 };
1249
1250 static void s3c24xx_serial_set_termios(struct uart_port *port,
1251 struct ktermios *termios,
1252 struct ktermios *old)
1253 {
1254 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1255 struct s3c24xx_uart_port *ourport = to_ourport(port);
1256 struct clk *clk = ERR_PTR(-EINVAL);
1257 unsigned long flags;
1258 unsigned int baud, quot, clk_sel = 0;
1259 unsigned int ulcon;
1260 unsigned int umcon;
1261 unsigned int udivslot = 0;
1262
1263 /*
1264 * We don't support modem control lines.
1265 */
1266 termios->c_cflag &= ~(HUPCL | CMSPAR);
1267 termios->c_cflag |= CLOCAL;
1268
1269 /*
1270 * Ask the core to calculate the divisor for us.
1271 */
1272
1273 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
1274 quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1275 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1276 quot = port->custom_divisor;
1277 if (IS_ERR(clk))
1278 return;
1279
1280 /* check to see if we need to change clock source */
1281
1282 if (ourport->baudclk != clk) {
1283 s3c24xx_serial_setsource(port, clk_sel);
1284
1285 if (!IS_ERR(ourport->baudclk)) {
1286 clk_disable_unprepare(ourport->baudclk);
1287 ourport->baudclk = ERR_PTR(-EINVAL);
1288 }
1289
1290 clk_prepare_enable(clk);
1291
1292 ourport->baudclk = clk;
1293 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1294 }
1295
1296 if (ourport->info->has_divslot) {
1297 unsigned int div = ourport->baudclk_rate / baud;
1298
1299 if (cfg->has_fracval) {
1300 udivslot = (div & 15);
1301 dbg("fracval = %04x\n", udivslot);
1302 } else {
1303 udivslot = udivslot_table[div & 15];
1304 dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
1305 }
1306 }
1307
1308 switch (termios->c_cflag & CSIZE) {
1309 case CS5:
1310 dbg("config: 5bits/char\n");
1311 ulcon = S3C2410_LCON_CS5;
1312 break;
1313 case CS6:
1314 dbg("config: 6bits/char\n");
1315 ulcon = S3C2410_LCON_CS6;
1316 break;
1317 case CS7:
1318 dbg("config: 7bits/char\n");
1319 ulcon = S3C2410_LCON_CS7;
1320 break;
1321 case CS8:
1322 default:
1323 dbg("config: 8bits/char\n");
1324 ulcon = S3C2410_LCON_CS8;
1325 break;
1326 }
1327
1328 /* preserve original lcon IR settings */
1329 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1330
1331 if (termios->c_cflag & CSTOPB)
1332 ulcon |= S3C2410_LCON_STOPB;
1333
1334 if (termios->c_cflag & PARENB) {
1335 if (termios->c_cflag & PARODD)
1336 ulcon |= S3C2410_LCON_PODD;
1337 else
1338 ulcon |= S3C2410_LCON_PEVEN;
1339 } else {
1340 ulcon |= S3C2410_LCON_PNONE;
1341 }
1342
1343 spin_lock_irqsave(&port->lock, flags);
1344
1345 dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1346 ulcon, quot, udivslot);
1347
1348 wr_regl(port, S3C2410_ULCON, ulcon);
1349 wr_regl(port, S3C2410_UBRDIV, quot);
1350
1351 umcon = rd_regl(port, S3C2410_UMCON);
1352 if (termios->c_cflag & CRTSCTS) {
1353 umcon |= S3C2410_UMCOM_AFC;
1354 /* Disable RTS when RX FIFO contains 63 bytes */
1355 umcon &= ~S3C2412_UMCON_AFC_8;
1356 } else {
1357 umcon &= ~S3C2410_UMCOM_AFC;
1358 }
1359 wr_regl(port, S3C2410_UMCON, umcon);
1360
1361 if (ourport->info->has_divslot)
1362 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1363
1364 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1365 rd_regl(port, S3C2410_ULCON),
1366 rd_regl(port, S3C2410_UCON),
1367 rd_regl(port, S3C2410_UFCON));
1368
1369 /*
1370 * Update the per-port timeout.
1371 */
1372 uart_update_timeout(port, termios->c_cflag, baud);
1373
1374 /*
1375 * Which character status flags are we interested in?
1376 */
1377 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1378 if (termios->c_iflag & INPCK)
1379 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1380 S3C2410_UERSTAT_PARITY;
1381 /*
1382 * Which character status flags should we ignore?
1383 */
1384 port->ignore_status_mask = 0;
1385 if (termios->c_iflag & IGNPAR)
1386 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1387 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1388 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1389
1390 /*
1391 * Ignore all characters if CREAD is not set.
1392 */
1393 if ((termios->c_cflag & CREAD) == 0)
1394 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1395
1396 spin_unlock_irqrestore(&port->lock, flags);
1397 }
1398
1399 static const char *s3c24xx_serial_type(struct uart_port *port)
1400 {
1401 switch (port->type) {
1402 case PORT_S3C2410:
1403 return "S3C2410";
1404 case PORT_S3C2440:
1405 return "S3C2440";
1406 case PORT_S3C2412:
1407 return "S3C2412";
1408 case PORT_S3C6400:
1409 return "S3C6400/10";
1410 default:
1411 return NULL;
1412 }
1413 }
1414
1415 #define MAP_SIZE (0x100)
1416
1417 static void s3c24xx_serial_release_port(struct uart_port *port)
1418 {
1419 release_mem_region(port->mapbase, MAP_SIZE);
1420 }
1421
1422 static int s3c24xx_serial_request_port(struct uart_port *port)
1423 {
1424 const char *name = s3c24xx_serial_portname(port);
1425 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
1426 }
1427
1428 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1429 {
1430 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1431
1432 if (flags & UART_CONFIG_TYPE &&
1433 s3c24xx_serial_request_port(port) == 0)
1434 port->type = info->type;
1435 }
1436
1437 /*
1438 * verify the new serial_struct (for TIOCSSERIAL).
1439 */
1440 static int
1441 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1442 {
1443 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1444
1445 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
1446 return -EINVAL;
1447
1448 return 0;
1449 }
1450
1451
1452 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1453
1454 static struct console s3c24xx_serial_console;
1455
1456 static int __init s3c24xx_serial_console_init(void)
1457 {
1458 register_console(&s3c24xx_serial_console);
1459 return 0;
1460 }
1461 console_initcall(s3c24xx_serial_console_init);
1462
1463 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1464 #else
1465 #define S3C24XX_SERIAL_CONSOLE NULL
1466 #endif
1467
1468 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1469 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1470 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1471 unsigned char c);
1472 #endif
1473
1474 static struct uart_ops s3c24xx_serial_ops = {
1475 .pm = s3c24xx_serial_pm,
1476 .tx_empty = s3c24xx_serial_tx_empty,
1477 .get_mctrl = s3c24xx_serial_get_mctrl,
1478 .set_mctrl = s3c24xx_serial_set_mctrl,
1479 .stop_tx = s3c24xx_serial_stop_tx,
1480 .start_tx = s3c24xx_serial_start_tx,
1481 .stop_rx = s3c24xx_serial_stop_rx,
1482 .break_ctl = s3c24xx_serial_break_ctl,
1483 .startup = s3c24xx_serial_startup,
1484 .shutdown = s3c24xx_serial_shutdown,
1485 .set_termios = s3c24xx_serial_set_termios,
1486 .type = s3c24xx_serial_type,
1487 .release_port = s3c24xx_serial_release_port,
1488 .request_port = s3c24xx_serial_request_port,
1489 .config_port = s3c24xx_serial_config_port,
1490 .verify_port = s3c24xx_serial_verify_port,
1491 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1492 .poll_get_char = s3c24xx_serial_get_poll_char,
1493 .poll_put_char = s3c24xx_serial_put_poll_char,
1494 #endif
1495 };
1496
1497 static struct uart_driver s3c24xx_uart_drv = {
1498 .owner = THIS_MODULE,
1499 .driver_name = "s3c2410_serial",
1500 .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
1501 .cons = S3C24XX_SERIAL_CONSOLE,
1502 .dev_name = S3C24XX_SERIAL_NAME,
1503 .major = S3C24XX_SERIAL_MAJOR,
1504 .minor = S3C24XX_SERIAL_MINOR,
1505 };
1506
1507 #define __PORT_LOCK_UNLOCKED(i) \
1508 __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
1509 static struct s3c24xx_uart_port
1510 s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
1511 [0] = {
1512 .port = {
1513 .lock = __PORT_LOCK_UNLOCKED(0),
1514 .iotype = UPIO_MEM,
1515 .uartclk = 0,
1516 .fifosize = 16,
1517 .ops = &s3c24xx_serial_ops,
1518 .flags = UPF_BOOT_AUTOCONF,
1519 .line = 0,
1520 }
1521 },
1522 [1] = {
1523 .port = {
1524 .lock = __PORT_LOCK_UNLOCKED(1),
1525 .iotype = UPIO_MEM,
1526 .uartclk = 0,
1527 .fifosize = 16,
1528 .ops = &s3c24xx_serial_ops,
1529 .flags = UPF_BOOT_AUTOCONF,
1530 .line = 1,
1531 }
1532 },
1533 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
1534
1535 [2] = {
1536 .port = {
1537 .lock = __PORT_LOCK_UNLOCKED(2),
1538 .iotype = UPIO_MEM,
1539 .uartclk = 0,
1540 .fifosize = 16,
1541 .ops = &s3c24xx_serial_ops,
1542 .flags = UPF_BOOT_AUTOCONF,
1543 .line = 2,
1544 }
1545 },
1546 #endif
1547 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
1548 [3] = {
1549 .port = {
1550 .lock = __PORT_LOCK_UNLOCKED(3),
1551 .iotype = UPIO_MEM,
1552 .uartclk = 0,
1553 .fifosize = 16,
1554 .ops = &s3c24xx_serial_ops,
1555 .flags = UPF_BOOT_AUTOCONF,
1556 .line = 3,
1557 }
1558 }
1559 #endif
1560 };
1561 #undef __PORT_LOCK_UNLOCKED
1562
1563 /* s3c24xx_serial_resetport
1564 *
1565 * reset the fifos and other the settings.
1566 */
1567
1568 static void s3c24xx_serial_resetport(struct uart_port *port,
1569 struct s3c2410_uartcfg *cfg)
1570 {
1571 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1572 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1573 unsigned int ucon_mask;
1574
1575 ucon_mask = info->clksel_mask;
1576 if (info->type == PORT_S3C2440)
1577 ucon_mask |= S3C2440_UCON0_DIVMASK;
1578
1579 ucon &= ucon_mask;
1580 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1581
1582 /* reset both fifos */
1583 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1584 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1585
1586 /* some delay is required after fifo reset */
1587 udelay(1);
1588 }
1589
1590
1591 #ifdef CONFIG_CPU_FREQ
1592
1593 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
1594 unsigned long val, void *data)
1595 {
1596 struct s3c24xx_uart_port *port;
1597 struct uart_port *uport;
1598
1599 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1600 uport = &port->port;
1601
1602 /* check to see if port is enabled */
1603
1604 if (port->pm_level != 0)
1605 return 0;
1606
1607 /* try and work out if the baudrate is changing, we can detect
1608 * a change in rate, but we do not have support for detecting
1609 * a disturbance in the clock-rate over the change.
1610 */
1611
1612 if (IS_ERR(port->baudclk))
1613 goto exit;
1614
1615 if (port->baudclk_rate == clk_get_rate(port->baudclk))
1616 goto exit;
1617
1618 if (val == CPUFREQ_PRECHANGE) {
1619 /* we should really shut the port down whilst the
1620 * frequency change is in progress. */
1621
1622 } else if (val == CPUFREQ_POSTCHANGE) {
1623 struct ktermios *termios;
1624 struct tty_struct *tty;
1625
1626 if (uport->state == NULL)
1627 goto exit;
1628
1629 tty = uport->state->port.tty;
1630
1631 if (tty == NULL)
1632 goto exit;
1633
1634 termios = &tty->termios;
1635
1636 if (termios == NULL) {
1637 dev_warn(uport->dev, "%s: no termios?\n", __func__);
1638 goto exit;
1639 }
1640
1641 s3c24xx_serial_set_termios(uport, termios, NULL);
1642 }
1643
1644 exit:
1645 return 0;
1646 }
1647
1648 static inline int
1649 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1650 {
1651 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1652
1653 return cpufreq_register_notifier(&port->freq_transition,
1654 CPUFREQ_TRANSITION_NOTIFIER);
1655 }
1656
1657 static inline void
1658 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1659 {
1660 cpufreq_unregister_notifier(&port->freq_transition,
1661 CPUFREQ_TRANSITION_NOTIFIER);
1662 }
1663
1664 #else
1665 static inline int
1666 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1667 {
1668 return 0;
1669 }
1670
1671 static inline void
1672 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1673 {
1674 }
1675 #endif
1676
1677 /* s3c24xx_serial_init_port
1678 *
1679 * initialise a single serial port from the platform device given
1680 */
1681
1682 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1683 struct platform_device *platdev)
1684 {
1685 struct uart_port *port = &ourport->port;
1686 struct s3c2410_uartcfg *cfg = ourport->cfg;
1687 struct resource *res;
1688 int ret;
1689
1690 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1691
1692 if (platdev == NULL)
1693 return -ENODEV;
1694
1695 if (port->mapbase != 0)
1696 return 0;
1697
1698 /* setup info for port */
1699 port->dev = &platdev->dev;
1700
1701 /* Startup sequence is different for s3c64xx and higher SoC's */
1702 if (s3c24xx_serial_has_interrupt_mask(port))
1703 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1704
1705 port->uartclk = 1;
1706
1707 if (cfg->uart_flags & UPF_CONS_FLOW) {
1708 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1709 port->flags |= UPF_CONS_FLOW;
1710 }
1711
1712 /* sort our the physical and virtual addresses for each UART */
1713
1714 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1715 if (res == NULL) {
1716 dev_err(port->dev, "failed to find memory resource for uart\n");
1717 return -EINVAL;
1718 }
1719
1720 dbg("resource %pR)\n", res);
1721
1722 port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
1723 if (!port->membase) {
1724 dev_err(port->dev, "failed to remap controller address\n");
1725 return -EBUSY;
1726 }
1727
1728 port->mapbase = res->start;
1729 ret = platform_get_irq(platdev, 0);
1730 if (ret < 0)
1731 port->irq = 0;
1732 else {
1733 port->irq = ret;
1734 ourport->rx_irq = ret;
1735 ourport->tx_irq = ret + 1;
1736 }
1737
1738 ret = platform_get_irq(platdev, 1);
1739 if (ret > 0)
1740 ourport->tx_irq = ret;
1741 /*
1742 * DMA is currently supported only on DT platforms, if DMA properties
1743 * are specified.
1744 */
1745 if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1746 "dmas", NULL)) {
1747 ourport->dma = devm_kzalloc(port->dev,
1748 sizeof(*ourport->dma),
1749 GFP_KERNEL);
1750 if (!ourport->dma)
1751 return -ENOMEM;
1752 }
1753
1754 ourport->clk = clk_get(&platdev->dev, "uart");
1755 if (IS_ERR(ourport->clk)) {
1756 pr_err("%s: Controller clock not found\n",
1757 dev_name(&platdev->dev));
1758 return PTR_ERR(ourport->clk);
1759 }
1760
1761 ret = clk_prepare_enable(ourport->clk);
1762 if (ret) {
1763 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1764 clk_put(ourport->clk);
1765 return ret;
1766 }
1767
1768 /* Keep all interrupts masked and cleared */
1769 if (s3c24xx_serial_has_interrupt_mask(port)) {
1770 wr_regl(port, S3C64XX_UINTM, 0xf);
1771 wr_regl(port, S3C64XX_UINTP, 0xf);
1772 wr_regl(port, S3C64XX_UINTSP, 0xf);
1773 }
1774
1775 dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1776 &port->mapbase, port->membase, port->irq,
1777 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1778
1779 /* reset the fifos (and setup the uart) */
1780 s3c24xx_serial_resetport(port, cfg);
1781 return 0;
1782 }
1783
1784 /* Device driver serial port probe */
1785
1786 static const struct of_device_id s3c24xx_uart_dt_match[];
1787 static int probe_index;
1788
1789 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1790 struct platform_device *pdev)
1791 {
1792 #ifdef CONFIG_OF
1793 if (pdev->dev.of_node) {
1794 const struct of_device_id *match;
1795 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1796 return (struct s3c24xx_serial_drv_data *)match->data;
1797 }
1798 #endif
1799 return (struct s3c24xx_serial_drv_data *)
1800 platform_get_device_id(pdev)->driver_data;
1801 }
1802
1803 static int s3c24xx_serial_probe(struct platform_device *pdev)
1804 {
1805 struct device_node *np = pdev->dev.of_node;
1806 struct s3c24xx_uart_port *ourport;
1807 int index = probe_index;
1808 int ret;
1809
1810 if (np) {
1811 ret = of_alias_get_id(np, "serial");
1812 if (ret >= 0)
1813 index = ret;
1814 }
1815
1816 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index);
1817
1818 ourport = &s3c24xx_serial_ports[index];
1819
1820 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1821 if (!ourport->drv_data) {
1822 dev_err(&pdev->dev, "could not find driver data\n");
1823 return -ENODEV;
1824 }
1825
1826 ourport->baudclk = ERR_PTR(-EINVAL);
1827 ourport->info = ourport->drv_data->info;
1828 ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1829 dev_get_platdata(&pdev->dev) :
1830 ourport->drv_data->def_cfg;
1831
1832 if (np)
1833 of_property_read_u32(np,
1834 "samsung,uart-fifosize", &ourport->port.fifosize);
1835
1836 if (ourport->drv_data->fifosize[index])
1837 ourport->port.fifosize = ourport->drv_data->fifosize[index];
1838 else if (ourport->info->fifosize)
1839 ourport->port.fifosize = ourport->info->fifosize;
1840
1841 probe_index++;
1842
1843 dbg("%s: initialising port %p...\n", __func__, ourport);
1844
1845 ret = s3c24xx_serial_init_port(ourport, pdev);
1846 if (ret < 0)
1847 return ret;
1848
1849 if (!s3c24xx_uart_drv.state) {
1850 ret = uart_register_driver(&s3c24xx_uart_drv);
1851 if (ret < 0) {
1852 pr_err("Failed to register Samsung UART driver\n");
1853 return ret;
1854 }
1855 }
1856
1857 dbg("%s: adding port\n", __func__);
1858 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1859 platform_set_drvdata(pdev, &ourport->port);
1860
1861 /*
1862 * Deactivate the clock enabled in s3c24xx_serial_init_port here,
1863 * so that a potential re-enablement through the pm-callback overlaps
1864 * and keeps the clock enabled in this case.
1865 */
1866 clk_disable_unprepare(ourport->clk);
1867
1868 ret = s3c24xx_serial_cpufreq_register(ourport);
1869 if (ret < 0)
1870 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1871
1872 return 0;
1873 }
1874
1875 static int s3c24xx_serial_remove(struct platform_device *dev)
1876 {
1877 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1878
1879 if (port) {
1880 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1881 uart_remove_one_port(&s3c24xx_uart_drv, port);
1882 }
1883
1884 uart_unregister_driver(&s3c24xx_uart_drv);
1885
1886 return 0;
1887 }
1888
1889 /* UART power management code */
1890 #ifdef CONFIG_PM_SLEEP
1891 static int s3c24xx_serial_suspend(struct device *dev)
1892 {
1893 struct uart_port *port = s3c24xx_dev_to_port(dev);
1894
1895 if (port)
1896 uart_suspend_port(&s3c24xx_uart_drv, port);
1897
1898 return 0;
1899 }
1900
1901 static int s3c24xx_serial_resume(struct device *dev)
1902 {
1903 struct uart_port *port = s3c24xx_dev_to_port(dev);
1904 struct s3c24xx_uart_port *ourport = to_ourport(port);
1905
1906 if (port) {
1907 clk_prepare_enable(ourport->clk);
1908 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1909 clk_disable_unprepare(ourport->clk);
1910
1911 uart_resume_port(&s3c24xx_uart_drv, port);
1912 }
1913
1914 return 0;
1915 }
1916
1917 static int s3c24xx_serial_resume_noirq(struct device *dev)
1918 {
1919 struct uart_port *port = s3c24xx_dev_to_port(dev);
1920
1921 if (port) {
1922 /* restore IRQ mask */
1923 if (s3c24xx_serial_has_interrupt_mask(port)) {
1924 unsigned int uintm = 0xf;
1925 if (tx_enabled(port))
1926 uintm &= ~S3C64XX_UINTM_TXD_MSK;
1927 if (rx_enabled(port))
1928 uintm &= ~S3C64XX_UINTM_RXD_MSK;
1929 wr_regl(port, S3C64XX_UINTM, uintm);
1930 }
1931 }
1932
1933 return 0;
1934 }
1935
1936 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1937 .suspend = s3c24xx_serial_suspend,
1938 .resume = s3c24xx_serial_resume,
1939 .resume_noirq = s3c24xx_serial_resume_noirq,
1940 };
1941 #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1942
1943 #else /* !CONFIG_PM_SLEEP */
1944
1945 #define SERIAL_SAMSUNG_PM_OPS NULL
1946 #endif /* CONFIG_PM_SLEEP */
1947
1948 /* Console code */
1949
1950 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1951
1952 static struct uart_port *cons_uart;
1953
1954 static int
1955 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1956 {
1957 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1958 unsigned long ufstat, utrstat;
1959
1960 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1961 /* fifo mode - check amount of data in fifo registers... */
1962
1963 ufstat = rd_regl(port, S3C2410_UFSTAT);
1964 return (ufstat & info->tx_fifofull) ? 0 : 1;
1965 }
1966
1967 /* in non-fifo mode, we go and use the tx buffer empty */
1968
1969 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1970 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1971 }
1972
1973 static bool
1974 s3c24xx_port_configured(unsigned int ucon)
1975 {
1976 /* consider the serial port configured if the tx/rx mode set */
1977 return (ucon & 0xf) != 0;
1978 }
1979
1980 #ifdef CONFIG_CONSOLE_POLL
1981 /*
1982 * Console polling routines for writing and reading from the uart while
1983 * in an interrupt or debug context.
1984 */
1985
1986 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
1987 {
1988 struct s3c24xx_uart_port *ourport = to_ourport(port);
1989 unsigned int ufstat;
1990
1991 ufstat = rd_regl(port, S3C2410_UFSTAT);
1992 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
1993 return NO_POLL_CHAR;
1994
1995 return rd_regb(port, S3C2410_URXH);
1996 }
1997
1998 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1999 unsigned char c)
2000 {
2001 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2002 unsigned int ucon = rd_regl(port, S3C2410_UCON);
2003
2004 /* not possible to xmit on unconfigured port */
2005 if (!s3c24xx_port_configured(ucon))
2006 return;
2007
2008 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2009 cpu_relax();
2010 wr_regb(port, S3C2410_UTXH, c);
2011 }
2012
2013 #endif /* CONFIG_CONSOLE_POLL */
2014
2015 static void
2016 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
2017 {
2018 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2019
2020 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2021 cpu_relax();
2022 wr_regb(port, S3C2410_UTXH, ch);
2023 }
2024
2025 static void
2026 s3c24xx_serial_console_write(struct console *co, const char *s,
2027 unsigned int count)
2028 {
2029 unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
2030
2031 /* not possible to xmit on unconfigured port */
2032 if (!s3c24xx_port_configured(ucon))
2033 return;
2034
2035 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2036 }
2037
2038 static void __init
2039 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2040 int *parity, int *bits)
2041 {
2042 struct clk *clk;
2043 unsigned int ulcon;
2044 unsigned int ucon;
2045 unsigned int ubrdiv;
2046 unsigned long rate;
2047 unsigned int clk_sel;
2048 char clk_name[MAX_CLK_NAME_LENGTH];
2049
2050 ulcon = rd_regl(port, S3C2410_ULCON);
2051 ucon = rd_regl(port, S3C2410_UCON);
2052 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2053
2054 dbg("s3c24xx_serial_get_options: port=%p\n"
2055 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
2056 port, ulcon, ucon, ubrdiv);
2057
2058 if (s3c24xx_port_configured(ucon)) {
2059 switch (ulcon & S3C2410_LCON_CSMASK) {
2060 case S3C2410_LCON_CS5:
2061 *bits = 5;
2062 break;
2063 case S3C2410_LCON_CS6:
2064 *bits = 6;
2065 break;
2066 case S3C2410_LCON_CS7:
2067 *bits = 7;
2068 break;
2069 case S3C2410_LCON_CS8:
2070 default:
2071 *bits = 8;
2072 break;
2073 }
2074
2075 switch (ulcon & S3C2410_LCON_PMASK) {
2076 case S3C2410_LCON_PEVEN:
2077 *parity = 'e';
2078 break;
2079
2080 case S3C2410_LCON_PODD:
2081 *parity = 'o';
2082 break;
2083
2084 case S3C2410_LCON_PNONE:
2085 default:
2086 *parity = 'n';
2087 }
2088
2089 /* now calculate the baud rate */
2090
2091 clk_sel = s3c24xx_serial_getsource(port);
2092 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2093
2094 clk = clk_get(port->dev, clk_name);
2095 if (!IS_ERR(clk))
2096 rate = clk_get_rate(clk);
2097 else
2098 rate = 1;
2099
2100 *baud = rate / (16 * (ubrdiv + 1));
2101 dbg("calculated baud %d\n", *baud);
2102 }
2103
2104 }
2105
2106 static int __init
2107 s3c24xx_serial_console_setup(struct console *co, char *options)
2108 {
2109 struct uart_port *port;
2110 int baud = 9600;
2111 int bits = 8;
2112 int parity = 'n';
2113 int flow = 'n';
2114
2115 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
2116 co, co->index, options);
2117
2118 /* is this a valid port */
2119
2120 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
2121 co->index = 0;
2122
2123 port = &s3c24xx_serial_ports[co->index].port;
2124
2125 /* is the port configured? */
2126
2127 if (port->mapbase == 0x0)
2128 return -ENODEV;
2129
2130 cons_uart = port;
2131
2132 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
2133
2134 /*
2135 * Check whether an invalid uart number has been specified, and
2136 * if so, search for the first available port that does have
2137 * console support.
2138 */
2139 if (options)
2140 uart_parse_options(options, &baud, &parity, &bits, &flow);
2141 else
2142 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2143
2144 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
2145
2146 return uart_set_options(port, co, baud, parity, bits, flow);
2147 }
2148
2149 static struct console s3c24xx_serial_console = {
2150 .name = S3C24XX_SERIAL_NAME,
2151 .device = uart_console_device,
2152 .flags = CON_PRINTBUFFER,
2153 .index = -1,
2154 .write = s3c24xx_serial_console_write,
2155 .setup = s3c24xx_serial_console_setup,
2156 .data = &s3c24xx_uart_drv,
2157 };
2158 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2159
2160 #ifdef CONFIG_CPU_S3C2410
2161 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
2162 .info = &(struct s3c24xx_uart_info) {
2163 .name = "Samsung S3C2410 UART",
2164 .type = PORT_S3C2410,
2165 .fifosize = 16,
2166 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
2167 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
2168 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
2169 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
2170 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
2171 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
2172 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2173 .num_clks = 2,
2174 .clksel_mask = S3C2410_UCON_CLKMASK,
2175 .clksel_shift = S3C2410_UCON_CLKSHIFT,
2176 },
2177 .def_cfg = &(struct s3c2410_uartcfg) {
2178 .ucon = S3C2410_UCON_DEFAULT,
2179 .ufcon = S3C2410_UFCON_DEFAULT,
2180 },
2181 };
2182 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
2183 #else
2184 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2185 #endif
2186
2187 #ifdef CONFIG_CPU_S3C2412
2188 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
2189 .info = &(struct s3c24xx_uart_info) {
2190 .name = "Samsung S3C2412 UART",
2191 .type = PORT_S3C2412,
2192 .fifosize = 64,
2193 .has_divslot = 1,
2194 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2195 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2196 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2197 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2198 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2199 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2200 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2201 .num_clks = 4,
2202 .clksel_mask = S3C2412_UCON_CLKMASK,
2203 .clksel_shift = S3C2412_UCON_CLKSHIFT,
2204 },
2205 .def_cfg = &(struct s3c2410_uartcfg) {
2206 .ucon = S3C2410_UCON_DEFAULT,
2207 .ufcon = S3C2410_UFCON_DEFAULT,
2208 },
2209 };
2210 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
2211 #else
2212 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2213 #endif
2214
2215 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
2216 defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
2217 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
2218 .info = &(struct s3c24xx_uart_info) {
2219 .name = "Samsung S3C2440 UART",
2220 .type = PORT_S3C2440,
2221 .fifosize = 64,
2222 .has_divslot = 1,
2223 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2224 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2225 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2226 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2227 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2228 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2229 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2230 .num_clks = 4,
2231 .clksel_mask = S3C2412_UCON_CLKMASK,
2232 .clksel_shift = S3C2412_UCON_CLKSHIFT,
2233 },
2234 .def_cfg = &(struct s3c2410_uartcfg) {
2235 .ucon = S3C2410_UCON_DEFAULT,
2236 .ufcon = S3C2410_UFCON_DEFAULT,
2237 },
2238 };
2239 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
2240 #else
2241 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2242 #endif
2243
2244 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2245 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2246 .info = &(struct s3c24xx_uart_info) {
2247 .name = "Samsung S3C6400 UART",
2248 .type = PORT_S3C6400,
2249 .fifosize = 64,
2250 .has_divslot = 1,
2251 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2252 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2253 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2254 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2255 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2256 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2257 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2258 .num_clks = 4,
2259 .clksel_mask = S3C6400_UCON_CLKMASK,
2260 .clksel_shift = S3C6400_UCON_CLKSHIFT,
2261 },
2262 .def_cfg = &(struct s3c2410_uartcfg) {
2263 .ucon = S3C2410_UCON_DEFAULT,
2264 .ufcon = S3C2410_UFCON_DEFAULT,
2265 },
2266 };
2267 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
2268 #else
2269 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2270 #endif
2271
2272 #ifdef CONFIG_CPU_S5PV210
2273 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2274 .info = &(struct s3c24xx_uart_info) {
2275 .name = "Samsung S5PV210 UART",
2276 .type = PORT_S3C6400,
2277 .has_divslot = 1,
2278 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
2279 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
2280 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
2281 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
2282 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
2283 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
2284 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2285 .num_clks = 2,
2286 .clksel_mask = S5PV210_UCON_CLKMASK,
2287 .clksel_shift = S5PV210_UCON_CLKSHIFT,
2288 },
2289 .def_cfg = &(struct s3c2410_uartcfg) {
2290 .ucon = S5PV210_UCON_DEFAULT,
2291 .ufcon = S5PV210_UFCON_DEFAULT,
2292 },
2293 .fifosize = { 256, 64, 16, 16 },
2294 };
2295 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
2296 #else
2297 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2298 #endif
2299
2300 #if defined(CONFIG_ARCH_EXYNOS)
2301 #define EXYNOS_COMMON_SERIAL_DRV_DATA \
2302 .info = &(struct s3c24xx_uart_info) { \
2303 .name = "Samsung Exynos UART", \
2304 .type = PORT_S3C6400, \
2305 .has_divslot = 1, \
2306 .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
2307 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
2308 .rx_fifofull = S5PV210_UFSTAT_RXFULL, \
2309 .tx_fifofull = S5PV210_UFSTAT_TXFULL, \
2310 .tx_fifomask = S5PV210_UFSTAT_TXMASK, \
2311 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \
2312 .def_clk_sel = S3C2410_UCON_CLKSEL0, \
2313 .num_clks = 1, \
2314 .clksel_mask = 0, \
2315 .clksel_shift = 0, \
2316 }, \
2317 .def_cfg = &(struct s3c2410_uartcfg) { \
2318 .ucon = S5PV210_UCON_DEFAULT, \
2319 .ufcon = S5PV210_UFCON_DEFAULT, \
2320 .has_fracval = 1, \
2321 } \
2322
2323 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2324 EXYNOS_COMMON_SERIAL_DRV_DATA,
2325 .fifosize = { 256, 64, 16, 16 },
2326 };
2327
2328 static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2329 EXYNOS_COMMON_SERIAL_DRV_DATA,
2330 .fifosize = { 64, 256, 16, 256 },
2331 };
2332
2333 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
2334 #define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
2335 #else
2336 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2337 #define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2338 #endif
2339
2340 static struct platform_device_id s3c24xx_serial_driver_ids[] = {
2341 {
2342 .name = "s3c2410-uart",
2343 .driver_data = S3C2410_SERIAL_DRV_DATA,
2344 }, {
2345 .name = "s3c2412-uart",
2346 .driver_data = S3C2412_SERIAL_DRV_DATA,
2347 }, {
2348 .name = "s3c2440-uart",
2349 .driver_data = S3C2440_SERIAL_DRV_DATA,
2350 }, {
2351 .name = "s3c6400-uart",
2352 .driver_data = S3C6400_SERIAL_DRV_DATA,
2353 }, {
2354 .name = "s5pv210-uart",
2355 .driver_data = S5PV210_SERIAL_DRV_DATA,
2356 }, {
2357 .name = "exynos4210-uart",
2358 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
2359 }, {
2360 .name = "exynos5433-uart",
2361 .driver_data = EXYNOS5433_SERIAL_DRV_DATA,
2362 },
2363 { },
2364 };
2365 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2366
2367 #ifdef CONFIG_OF
2368 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2369 { .compatible = "samsung,s3c2410-uart",
2370 .data = (void *)S3C2410_SERIAL_DRV_DATA },
2371 { .compatible = "samsung,s3c2412-uart",
2372 .data = (void *)S3C2412_SERIAL_DRV_DATA },
2373 { .compatible = "samsung,s3c2440-uart",
2374 .data = (void *)S3C2440_SERIAL_DRV_DATA },
2375 { .compatible = "samsung,s3c6400-uart",
2376 .data = (void *)S3C6400_SERIAL_DRV_DATA },
2377 { .compatible = "samsung,s5pv210-uart",
2378 .data = (void *)S5PV210_SERIAL_DRV_DATA },
2379 { .compatible = "samsung,exynos4210-uart",
2380 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
2381 { .compatible = "samsung,exynos5433-uart",
2382 .data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
2383 {},
2384 };
2385 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2386 #endif
2387
2388 static struct platform_driver samsung_serial_driver = {
2389 .probe = s3c24xx_serial_probe,
2390 .remove = s3c24xx_serial_remove,
2391 .id_table = s3c24xx_serial_driver_ids,
2392 .driver = {
2393 .name = "samsung-uart",
2394 .pm = SERIAL_SAMSUNG_PM_OPS,
2395 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2396 },
2397 };
2398
2399 module_platform_driver(samsung_serial_driver);
2400
2401 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2402 /*
2403 * Early console.
2404 */
2405
2406 struct samsung_early_console_data {
2407 u32 txfull_mask;
2408 };
2409
2410 static void samsung_early_busyuart(struct uart_port *port)
2411 {
2412 while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2413 ;
2414 }
2415
2416 static void samsung_early_busyuart_fifo(struct uart_port *port)
2417 {
2418 struct samsung_early_console_data *data = port->private_data;
2419
2420 while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2421 ;
2422 }
2423
2424 static void samsung_early_putc(struct uart_port *port, int c)
2425 {
2426 if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2427 samsung_early_busyuart_fifo(port);
2428 else
2429 samsung_early_busyuart(port);
2430
2431 writeb(c, port->membase + S3C2410_UTXH);
2432 }
2433
2434 static void samsung_early_write(struct console *con, const char *s, unsigned n)
2435 {
2436 struct earlycon_device *dev = con->data;
2437
2438 uart_console_write(&dev->port, s, n, samsung_early_putc);
2439 }
2440
2441 static int __init samsung_early_console_setup(struct earlycon_device *device,
2442 const char *opt)
2443 {
2444 if (!device->port.membase)
2445 return -ENODEV;
2446
2447 device->con->write = samsung_early_write;
2448 return 0;
2449 }
2450
2451 /* S3C2410 */
2452 static struct samsung_early_console_data s3c2410_early_console_data = {
2453 .txfull_mask = S3C2410_UFSTAT_TXFULL,
2454 };
2455
2456 static int __init s3c2410_early_console_setup(struct earlycon_device *device,
2457 const char *opt)
2458 {
2459 device->port.private_data = &s3c2410_early_console_data;
2460 return samsung_early_console_setup(device, opt);
2461 }
2462 OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
2463 s3c2410_early_console_setup);
2464 EARLYCON_DECLARE(s3c2410, s3c2410_early_console_setup);
2465
2466 /* S3C2412, S3C2440, S3C64xx */
2467 static struct samsung_early_console_data s3c2440_early_console_data = {
2468 .txfull_mask = S3C2440_UFSTAT_TXFULL,
2469 };
2470
2471 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2472 const char *opt)
2473 {
2474 device->port.private_data = &s3c2440_early_console_data;
2475 return samsung_early_console_setup(device, opt);
2476 }
2477 OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
2478 s3c2440_early_console_setup);
2479 OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
2480 s3c2440_early_console_setup);
2481 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2482 s3c2440_early_console_setup);
2483 EARLYCON_DECLARE(s3c2412, s3c2440_early_console_setup);
2484 EARLYCON_DECLARE(s3c2440, s3c2440_early_console_setup);
2485 EARLYCON_DECLARE(s3c6400, s3c2440_early_console_setup);
2486
2487 /* S5PV210, EXYNOS */
2488 static struct samsung_early_console_data s5pv210_early_console_data = {
2489 .txfull_mask = S5PV210_UFSTAT_TXFULL,
2490 };
2491
2492 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2493 const char *opt)
2494 {
2495 device->port.private_data = &s5pv210_early_console_data;
2496 return samsung_early_console_setup(device, opt);
2497 }
2498 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2499 s5pv210_early_console_setup);
2500 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2501 s5pv210_early_console_setup);
2502 EARLYCON_DECLARE(s5pv210, s5pv210_early_console_setup);
2503 EARLYCON_DECLARE(exynos4210, s5pv210_early_console_setup);
2504 #endif
2505
2506 MODULE_ALIAS("platform:samsung-uart");
2507 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2508 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
2509 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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