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powerpc/kprobes: Remove kretprobe_trampoline_holder.
[linux/fpc-iii.git] / drivers / tty / serial / samsung.c
blob99bb23161dd6e5f3ac514f9a9218cd4590467169
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(MODULE)
57
58 extern void printascii(const char *);
59
60 __printf(1, 2)
61 static void dbg(const char *fmt, ...)
62 {
63 va_list va;
64 char buff[256];
65
66 va_start(va, fmt);
67 vscnprintf(buff, sizeof(buff), fmt, va);
68 va_end(va);
69
70 printascii(buff);
71 }
72
73 #else
74 #define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0)
75 #endif
76
77 /* UART name and device definitions */
78
79 #define S3C24XX_SERIAL_NAME "ttySAC"
80 #define S3C24XX_SERIAL_MAJOR 204
81 #define S3C24XX_SERIAL_MINOR 64
82
83 #define S3C24XX_TX_PIO 1
84 #define S3C24XX_TX_DMA 2
85 #define S3C24XX_RX_PIO 1
86 #define S3C24XX_RX_DMA 2
87 /* macros to change one thing to another */
88
89 #define tx_enabled(port) ((port)->unused[0])
90 #define rx_enabled(port) ((port)->unused[1])
91
92 /* flag to ignore all characters coming in */
93 #define RXSTAT_DUMMY_READ (0x10000000)
94
95 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
96 {
97 return container_of(port, struct s3c24xx_uart_port, port);
98 }
99
100 /* translate a port to the device name */
101
102 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
103 {
104 return to_platform_device(port->dev)->name;
105 }
106
107 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
108 {
109 return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
110 }
111
112 /*
113 * s3c64xx and later SoC's include the interrupt mask and status registers in
114 * the controller itself, unlike the s3c24xx SoC's which have these registers
115 * in the interrupt controller. Check if the port type is s3c64xx or higher.
116 */
117 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
118 {
119 return to_ourport(port)->info->type == PORT_S3C6400;
120 }
121
122 static void s3c24xx_serial_rx_enable(struct uart_port *port)
123 {
124 unsigned long flags;
125 unsigned int ucon, ufcon;
126 int count = 10000;
127
128 spin_lock_irqsave(&port->lock, flags);
129
130 while (--count && !s3c24xx_serial_txempty_nofifo(port))
131 udelay(100);
132
133 ufcon = rd_regl(port, S3C2410_UFCON);
134 ufcon |= S3C2410_UFCON_RESETRX;
135 wr_regl(port, S3C2410_UFCON, ufcon);
136
137 ucon = rd_regl(port, S3C2410_UCON);
138 ucon |= S3C2410_UCON_RXIRQMODE;
139 wr_regl(port, S3C2410_UCON, ucon);
140
141 rx_enabled(port) = 1;
142 spin_unlock_irqrestore(&port->lock, flags);
143 }
144
145 static void s3c24xx_serial_rx_disable(struct uart_port *port)
146 {
147 unsigned long flags;
148 unsigned int ucon;
149
150 spin_lock_irqsave(&port->lock, flags);
151
152 ucon = rd_regl(port, S3C2410_UCON);
153 ucon &= ~S3C2410_UCON_RXIRQMODE;
154 wr_regl(port, S3C2410_UCON, ucon);
155
156 rx_enabled(port) = 0;
157 spin_unlock_irqrestore(&port->lock, flags);
158 }
159
160 static void s3c24xx_serial_stop_tx(struct uart_port *port)
161 {
162 struct s3c24xx_uart_port *ourport = to_ourport(port);
163 struct s3c24xx_uart_dma *dma = ourport->dma;
164 struct circ_buf *xmit = &port->state->xmit;
165 struct dma_tx_state state;
166 int count;
167
168 if (!tx_enabled(port))
169 return;
170
171 if (s3c24xx_serial_has_interrupt_mask(port))
172 __set_bit(S3C64XX_UINTM_TXD,
173 portaddrl(port, S3C64XX_UINTM));
174 else
175 disable_irq_nosync(ourport->tx_irq);
176
177 if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
178 dmaengine_pause(dma->tx_chan);
179 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
180 dmaengine_terminate_all(dma->tx_chan);
181 dma_sync_single_for_cpu(ourport->port.dev,
182 dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
183 async_tx_ack(dma->tx_desc);
184 count = dma->tx_bytes_requested - state.residue;
185 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
186 port->icount.tx += count;
187 }
188
189 tx_enabled(port) = 0;
190 ourport->tx_in_progress = 0;
191
192 if (port->flags & UPF_CONS_FLOW)
193 s3c24xx_serial_rx_enable(port);
194
195 ourport->tx_mode = 0;
196 }
197
198 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
199
200 static void s3c24xx_serial_tx_dma_complete(void *args)
201 {
202 struct s3c24xx_uart_port *ourport = args;
203 struct uart_port *port = &ourport->port;
204 struct circ_buf *xmit = &port->state->xmit;
205 struct s3c24xx_uart_dma *dma = ourport->dma;
206 struct dma_tx_state state;
207 unsigned long flags;
208 int count;
209
210
211 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
212 count = dma->tx_bytes_requested - state.residue;
213 async_tx_ack(dma->tx_desc);
214
215 dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
216 dma->tx_size, DMA_TO_DEVICE);
217
218 spin_lock_irqsave(&port->lock, flags);
219
220 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
221 port->icount.tx += count;
222 ourport->tx_in_progress = 0;
223
224 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
225 uart_write_wakeup(port);
226
227 s3c24xx_serial_start_next_tx(ourport);
228 spin_unlock_irqrestore(&port->lock, flags);
229 }
230
231 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
232 {
233 struct uart_port *port = &ourport->port;
234 u32 ucon;
235
236 /* Mask Tx interrupt */
237 if (s3c24xx_serial_has_interrupt_mask(port))
238 __set_bit(S3C64XX_UINTM_TXD,
239 portaddrl(port, S3C64XX_UINTM));
240 else
241 disable_irq_nosync(ourport->tx_irq);
242
243 /* Enable tx dma mode */
244 ucon = rd_regl(port, S3C2410_UCON);
245 ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
246 ucon |= (dma_get_cache_alignment() >= 16) ?
247 S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
248 ucon |= S3C64XX_UCON_TXMODE_DMA;
249 wr_regl(port, S3C2410_UCON, ucon);
250
251 ourport->tx_mode = S3C24XX_TX_DMA;
252 }
253
254 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
255 {
256 struct uart_port *port = &ourport->port;
257 u32 ucon, ufcon;
258
259 /* Set ufcon txtrig */
260 ourport->tx_in_progress = S3C24XX_TX_PIO;
261 ufcon = rd_regl(port, S3C2410_UFCON);
262 wr_regl(port, S3C2410_UFCON, ufcon);
263
264 /* Enable tx pio mode */
265 ucon = rd_regl(port, S3C2410_UCON);
266 ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
267 ucon |= S3C64XX_UCON_TXMODE_CPU;
268 wr_regl(port, S3C2410_UCON, ucon);
269
270 /* Unmask Tx interrupt */
271 if (s3c24xx_serial_has_interrupt_mask(port))
272 __clear_bit(S3C64XX_UINTM_TXD,
273 portaddrl(port, S3C64XX_UINTM));
274 else
275 enable_irq(ourport->tx_irq);
276
277 ourport->tx_mode = S3C24XX_TX_PIO;
278 }
279
280 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
281 {
282 if (ourport->tx_mode != S3C24XX_TX_PIO)
283 enable_tx_pio(ourport);
284 }
285
286 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
287 unsigned int count)
288 {
289 struct uart_port *port = &ourport->port;
290 struct circ_buf *xmit = &port->state->xmit;
291 struct s3c24xx_uart_dma *dma = ourport->dma;
292
293
294 if (ourport->tx_mode != S3C24XX_TX_DMA)
295 enable_tx_dma(ourport);
296
297 dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
298 dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
299
300 dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
301 dma->tx_size, DMA_TO_DEVICE);
302
303 dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
304 dma->tx_transfer_addr, dma->tx_size,
305 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
306 if (!dma->tx_desc) {
307 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
308 return -EIO;
309 }
310
311 dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
312 dma->tx_desc->callback_param = ourport;
313 dma->tx_bytes_requested = dma->tx_size;
314
315 ourport->tx_in_progress = S3C24XX_TX_DMA;
316 dma->tx_cookie = dmaengine_submit(dma->tx_desc);
317 dma_async_issue_pending(dma->tx_chan);
318 return 0;
319 }
320
321 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
322 {
323 struct uart_port *port = &ourport->port;
324 struct circ_buf *xmit = &port->state->xmit;
325 unsigned long count;
326
327 /* Get data size up to the end of buffer */
328 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
329
330 if (!count) {
331 s3c24xx_serial_stop_tx(port);
332 return;
333 }
334
335 if (!ourport->dma || !ourport->dma->tx_chan ||
336 count < ourport->min_dma_size ||
337 xmit->tail & (dma_get_cache_alignment() - 1))
338 s3c24xx_serial_start_tx_pio(ourport);
339 else
340 s3c24xx_serial_start_tx_dma(ourport, count);
341 }
342
343 static void s3c24xx_serial_start_tx(struct uart_port *port)
344 {
345 struct s3c24xx_uart_port *ourport = to_ourport(port);
346 struct circ_buf *xmit = &port->state->xmit;
347
348 if (!tx_enabled(port)) {
349 if (port->flags & UPF_CONS_FLOW)
350 s3c24xx_serial_rx_disable(port);
351
352 tx_enabled(port) = 1;
353 if (!ourport->dma || !ourport->dma->tx_chan)
354 s3c24xx_serial_start_tx_pio(ourport);
355 }
356
357 if (ourport->dma && ourport->dma->tx_chan) {
358 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
359 s3c24xx_serial_start_next_tx(ourport);
360 }
361 }
362
363 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
364 struct tty_port *tty, int count)
365 {
366 struct s3c24xx_uart_dma *dma = ourport->dma;
367 int copied;
368
369 if (!count)
370 return;
371
372 dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
373 dma->rx_size, DMA_FROM_DEVICE);
374
375 ourport->port.icount.rx += count;
376 if (!tty) {
377 dev_err(ourport->port.dev, "No tty port\n");
378 return;
379 }
380 copied = tty_insert_flip_string(tty,
381 ((unsigned char *)(ourport->dma->rx_buf)), count);
382 if (copied != count) {
383 WARN_ON(1);
384 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
385 }
386 }
387
388 static void s3c24xx_serial_stop_rx(struct uart_port *port)
389 {
390 struct s3c24xx_uart_port *ourport = to_ourport(port);
391 struct s3c24xx_uart_dma *dma = ourport->dma;
392 struct tty_port *t = &port->state->port;
393 struct dma_tx_state state;
394 enum dma_status dma_status;
395 unsigned int received;
396
397 if (rx_enabled(port)) {
398 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
399 if (s3c24xx_serial_has_interrupt_mask(port))
400 __set_bit(S3C64XX_UINTM_RXD,
401 portaddrl(port, S3C64XX_UINTM));
402 else
403 disable_irq_nosync(ourport->rx_irq);
404 rx_enabled(port) = 0;
405 }
406 if (dma && dma->rx_chan) {
407 dmaengine_pause(dma->tx_chan);
408 dma_status = dmaengine_tx_status(dma->rx_chan,
409 dma->rx_cookie, &state);
410 if (dma_status == DMA_IN_PROGRESS ||
411 dma_status == DMA_PAUSED) {
412 received = dma->rx_bytes_requested - state.residue;
413 dmaengine_terminate_all(dma->rx_chan);
414 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
415 }
416 }
417 }
418
419 static inline struct s3c24xx_uart_info
420 *s3c24xx_port_to_info(struct uart_port *port)
421 {
422 return to_ourport(port)->info;
423 }
424
425 static inline struct s3c2410_uartcfg
426 *s3c24xx_port_to_cfg(struct uart_port *port)
427 {
428 struct s3c24xx_uart_port *ourport;
429
430 if (port->dev == NULL)
431 return NULL;
432
433 ourport = container_of(port, struct s3c24xx_uart_port, port);
434 return ourport->cfg;
435 }
436
437 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
438 unsigned long ufstat)
439 {
440 struct s3c24xx_uart_info *info = ourport->info;
441
442 if (ufstat & info->rx_fifofull)
443 return ourport->port.fifosize;
444
445 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
446 }
447
448 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
449 static void s3c24xx_serial_rx_dma_complete(void *args)
450 {
451 struct s3c24xx_uart_port *ourport = args;
452 struct uart_port *port = &ourport->port;
453
454 struct s3c24xx_uart_dma *dma = ourport->dma;
455 struct tty_port *t = &port->state->port;
456 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
457
458 struct dma_tx_state state;
459 unsigned long flags;
460 int received;
461
462 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
463 received = dma->rx_bytes_requested - state.residue;
464 async_tx_ack(dma->rx_desc);
465
466 spin_lock_irqsave(&port->lock, flags);
467
468 if (received)
469 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
470
471 if (tty) {
472 tty_flip_buffer_push(t);
473 tty_kref_put(tty);
474 }
475
476 s3c64xx_start_rx_dma(ourport);
477
478 spin_unlock_irqrestore(&port->lock, flags);
479 }
480
481 static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
482 {
483 struct s3c24xx_uart_dma *dma = ourport->dma;
484
485 dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
486 dma->rx_size, DMA_FROM_DEVICE);
487
488 dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
489 dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
490 DMA_PREP_INTERRUPT);
491 if (!dma->rx_desc) {
492 dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
493 return;
494 }
495
496 dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
497 dma->rx_desc->callback_param = ourport;
498 dma->rx_bytes_requested = dma->rx_size;
499
500 dma->rx_cookie = dmaengine_submit(dma->rx_desc);
501 dma_async_issue_pending(dma->rx_chan);
502 }
503
504 /* ? - where has parity gone?? */
505 #define S3C2410_UERSTAT_PARITY (0x1000)
506
507 static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
508 {
509 struct uart_port *port = &ourport->port;
510 unsigned int ucon;
511
512 /* set Rx mode to DMA mode */
513 ucon = rd_regl(port, S3C2410_UCON);
514 ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
515 S3C64XX_UCON_TIMEOUT_MASK |
516 S3C64XX_UCON_EMPTYINT_EN |
517 S3C64XX_UCON_DMASUS_EN |
518 S3C64XX_UCON_TIMEOUT_EN |
519 S3C64XX_UCON_RXMODE_MASK);
520 ucon |= S3C64XX_UCON_RXBURST_16 |
521 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
522 S3C64XX_UCON_EMPTYINT_EN |
523 S3C64XX_UCON_TIMEOUT_EN |
524 S3C64XX_UCON_RXMODE_DMA;
525 wr_regl(port, S3C2410_UCON, ucon);
526
527 ourport->rx_mode = S3C24XX_RX_DMA;
528 }
529
530 static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
531 {
532 struct uart_port *port = &ourport->port;
533 unsigned int ucon;
534
535 /* set Rx mode to DMA mode */
536 ucon = rd_regl(port, S3C2410_UCON);
537 ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
538 S3C64XX_UCON_EMPTYINT_EN |
539 S3C64XX_UCON_DMASUS_EN |
540 S3C64XX_UCON_TIMEOUT_EN |
541 S3C64XX_UCON_RXMODE_MASK);
542 ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
543 S3C64XX_UCON_TIMEOUT_EN |
544 S3C64XX_UCON_RXMODE_CPU;
545 wr_regl(port, S3C2410_UCON, ucon);
546
547 ourport->rx_mode = S3C24XX_RX_PIO;
548 }
549
550 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport);
551
552 static irqreturn_t s3c24xx_serial_rx_chars_dma(void *dev_id)
553 {
554 unsigned int utrstat, ufstat, received;
555 struct s3c24xx_uart_port *ourport = dev_id;
556 struct uart_port *port = &ourport->port;
557 struct s3c24xx_uart_dma *dma = ourport->dma;
558 struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
559 struct tty_port *t = &port->state->port;
560 unsigned long flags;
561 struct dma_tx_state state;
562
563 utrstat = rd_regl(port, S3C2410_UTRSTAT);
564 ufstat = rd_regl(port, S3C2410_UFSTAT);
565
566 spin_lock_irqsave(&port->lock, flags);
567
568 if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
569 s3c64xx_start_rx_dma(ourport);
570 if (ourport->rx_mode == S3C24XX_RX_PIO)
571 enable_rx_dma(ourport);
572 goto finish;
573 }
574
575 if (ourport->rx_mode == S3C24XX_RX_DMA) {
576 dmaengine_pause(dma->rx_chan);
577 dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
578 dmaengine_terminate_all(dma->rx_chan);
579 received = dma->rx_bytes_requested - state.residue;
580 s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
581
582 enable_rx_pio(ourport);
583 }
584
585 s3c24xx_serial_rx_drain_fifo(ourport);
586
587 if (tty) {
588 tty_flip_buffer_push(t);
589 tty_kref_put(tty);
590 }
591
592 wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
593
594 finish:
595 spin_unlock_irqrestore(&port->lock, flags);
596
597 return IRQ_HANDLED;
598 }
599
600 static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
601 {
602 struct uart_port *port = &ourport->port;
603 unsigned int ufcon, ch, flag, ufstat, uerstat;
604 unsigned int fifocnt = 0;
605 int max_count = port->fifosize;
606
607 while (max_count-- > 0) {
608 /*
609 * Receive all characters known to be in FIFO
610 * before reading FIFO level again
611 */
612 if (fifocnt == 0) {
613 ufstat = rd_regl(port, S3C2410_UFSTAT);
614 fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
615 if (fifocnt == 0)
616 break;
617 }
618 fifocnt--;
619
620 uerstat = rd_regl(port, S3C2410_UERSTAT);
621 ch = rd_regb(port, S3C2410_URXH);
622
623 if (port->flags & UPF_CONS_FLOW) {
624 int txe = s3c24xx_serial_txempty_nofifo(port);
625
626 if (rx_enabled(port)) {
627 if (!txe) {
628 rx_enabled(port) = 0;
629 continue;
630 }
631 } else {
632 if (txe) {
633 ufcon = rd_regl(port, S3C2410_UFCON);
634 ufcon |= S3C2410_UFCON_RESETRX;
635 wr_regl(port, S3C2410_UFCON, ufcon);
636 rx_enabled(port) = 1;
637 return;
638 }
639 continue;
640 }
641 }
642
643 /* insert the character into the buffer */
644
645 flag = TTY_NORMAL;
646 port->icount.rx++;
647
648 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
649 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
650 ch, uerstat);
651
652 /* check for break */
653 if (uerstat & S3C2410_UERSTAT_BREAK) {
654 dbg("break!\n");
655 port->icount.brk++;
656 if (uart_handle_break(port))
657 continue; /* Ignore character */
658 }
659
660 if (uerstat & S3C2410_UERSTAT_FRAME)
661 port->icount.frame++;
662 if (uerstat & S3C2410_UERSTAT_OVERRUN)
663 port->icount.overrun++;
664
665 uerstat &= port->read_status_mask;
666
667 if (uerstat & S3C2410_UERSTAT_BREAK)
668 flag = TTY_BREAK;
669 else if (uerstat & S3C2410_UERSTAT_PARITY)
670 flag = TTY_PARITY;
671 else if (uerstat & (S3C2410_UERSTAT_FRAME |
672 S3C2410_UERSTAT_OVERRUN))
673 flag = TTY_FRAME;
674 }
675
676 if (uart_handle_sysrq_char(port, ch))
677 continue; /* Ignore character */
678
679 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
680 ch, flag);
681 }
682
683 tty_flip_buffer_push(&port->state->port);
684 }
685
686 static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
687 {
688 struct s3c24xx_uart_port *ourport = dev_id;
689 struct uart_port *port = &ourport->port;
690 unsigned long flags;
691
692 spin_lock_irqsave(&port->lock, flags);
693 s3c24xx_serial_rx_drain_fifo(ourport);
694 spin_unlock_irqrestore(&port->lock, flags);
695
696 return IRQ_HANDLED;
697 }
698
699
700 static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
701 {
702 struct s3c24xx_uart_port *ourport = dev_id;
703
704 if (ourport->dma && ourport->dma->rx_chan)
705 return s3c24xx_serial_rx_chars_dma(dev_id);
706 return s3c24xx_serial_rx_chars_pio(dev_id);
707 }
708
709 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
710 {
711 struct s3c24xx_uart_port *ourport = id;
712 struct uart_port *port = &ourport->port;
713 struct circ_buf *xmit = &port->state->xmit;
714 unsigned long flags;
715 int count, dma_count = 0;
716
717 spin_lock_irqsave(&port->lock, flags);
718
719 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
720
721 if (ourport->dma && ourport->dma->tx_chan &&
722 count >= ourport->min_dma_size) {
723 int align = dma_get_cache_alignment() -
724 (xmit->tail & (dma_get_cache_alignment() - 1));
725 if (count-align >= ourport->min_dma_size) {
726 dma_count = count-align;
727 count = align;
728 }
729 }
730
731 if (port->x_char) {
732 wr_regb(port, S3C2410_UTXH, port->x_char);
733 port->icount.tx++;
734 port->x_char = 0;
735 goto out;
736 }
737
738 /* if there isn't anything more to transmit, or the uart is now
739 * stopped, disable the uart and exit
740 */
741
742 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
743 s3c24xx_serial_stop_tx(port);
744 goto out;
745 }
746
747 /* try and drain the buffer... */
748
749 if (count > port->fifosize) {
750 count = port->fifosize;
751 dma_count = 0;
752 }
753
754 while (!uart_circ_empty(xmit) && count > 0) {
755 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
756 break;
757
758 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
759 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
760 port->icount.tx++;
761 count--;
762 }
763
764 if (!count && dma_count) {
765 s3c24xx_serial_start_tx_dma(ourport, dma_count);
766 goto out;
767 }
768
769 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
770 spin_unlock(&port->lock);
771 uart_write_wakeup(port);
772 spin_lock(&port->lock);
773 }
774
775 if (uart_circ_empty(xmit))
776 s3c24xx_serial_stop_tx(port);
777
778 out:
779 spin_unlock_irqrestore(&port->lock, flags);
780 return IRQ_HANDLED;
781 }
782
783 /* interrupt handler for s3c64xx and later SoC's.*/
784 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
785 {
786 struct s3c24xx_uart_port *ourport = id;
787 struct uart_port *port = &ourport->port;
788 unsigned int pend = rd_regl(port, S3C64XX_UINTP);
789 irqreturn_t ret = IRQ_HANDLED;
790
791 if (pend & S3C64XX_UINTM_RXD_MSK) {
792 ret = s3c24xx_serial_rx_chars(irq, id);
793 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
794 }
795 if (pend & S3C64XX_UINTM_TXD_MSK) {
796 ret = s3c24xx_serial_tx_chars(irq, id);
797 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
798 }
799 return ret;
800 }
801
802 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
803 {
804 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
805 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
806 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
807
808 if (ufcon & S3C2410_UFCON_FIFOMODE) {
809 if ((ufstat & info->tx_fifomask) != 0 ||
810 (ufstat & info->tx_fifofull))
811 return 0;
812
813 return 1;
814 }
815
816 return s3c24xx_serial_txempty_nofifo(port);
817 }
818
819 /* no modem control lines */
820 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
821 {
822 unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
823
824 if (umstat & S3C2410_UMSTAT_CTS)
825 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
826 else
827 return TIOCM_CAR | TIOCM_DSR;
828 }
829
830 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
831 {
832 unsigned int umcon = rd_regl(port, S3C2410_UMCON);
833
834 if (mctrl & TIOCM_RTS)
835 umcon |= S3C2410_UMCOM_RTS_LOW;
836 else
837 umcon &= ~S3C2410_UMCOM_RTS_LOW;
838
839 wr_regl(port, S3C2410_UMCON, umcon);
840 }
841
842 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
843 {
844 unsigned long flags;
845 unsigned int ucon;
846
847 spin_lock_irqsave(&port->lock, flags);
848
849 ucon = rd_regl(port, S3C2410_UCON);
850
851 if (break_state)
852 ucon |= S3C2410_UCON_SBREAK;
853 else
854 ucon &= ~S3C2410_UCON_SBREAK;
855
856 wr_regl(port, S3C2410_UCON, ucon);
857
858 spin_unlock_irqrestore(&port->lock, flags);
859 }
860
861 static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
862 {
863 struct s3c24xx_uart_dma *dma = p->dma;
864 dma_cap_mask_t mask;
865 unsigned long flags;
866
867 /* Default slave configuration parameters */
868 dma->rx_conf.direction = DMA_DEV_TO_MEM;
869 dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
870 dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH;
871 dma->rx_conf.src_maxburst = 16;
872
873 dma->tx_conf.direction = DMA_MEM_TO_DEV;
874 dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
875 dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH;
876 if (dma_get_cache_alignment() >= 16)
877 dma->tx_conf.dst_maxburst = 16;
878 else
879 dma->tx_conf.dst_maxburst = 1;
880
881 dma_cap_zero(mask);
882 dma_cap_set(DMA_SLAVE, mask);
883
884 dma->rx_chan = dma_request_slave_channel_compat(mask, dma->fn,
885 dma->rx_param, p->port.dev, "rx");
886 if (!dma->rx_chan)
887 return -ENODEV;
888
889 dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
890
891 dma->tx_chan = dma_request_slave_channel_compat(mask, dma->fn,
892 dma->tx_param, p->port.dev, "tx");
893 if (!dma->tx_chan) {
894 dma_release_channel(dma->rx_chan);
895 return -ENODEV;
896 }
897
898 dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
899
900 /* RX buffer */
901 dma->rx_size = PAGE_SIZE;
902
903 dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
904
905 if (!dma->rx_buf) {
906 dma_release_channel(dma->rx_chan);
907 dma_release_channel(dma->tx_chan);
908 return -ENOMEM;
909 }
910
911 dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
912 dma->rx_size, DMA_FROM_DEVICE);
913
914 spin_lock_irqsave(&p->port.lock, flags);
915
916 /* TX buffer */
917 dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
918 p->port.state->xmit.buf,
919 UART_XMIT_SIZE, DMA_TO_DEVICE);
920
921 spin_unlock_irqrestore(&p->port.lock, flags);
922
923 return 0;
924 }
925
926 static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
927 {
928 struct s3c24xx_uart_dma *dma = p->dma;
929
930 if (dma->rx_chan) {
931 dmaengine_terminate_all(dma->rx_chan);
932 dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
933 dma->rx_size, DMA_FROM_DEVICE);
934 kfree(dma->rx_buf);
935 dma_release_channel(dma->rx_chan);
936 dma->rx_chan = NULL;
937 }
938
939 if (dma->tx_chan) {
940 dmaengine_terminate_all(dma->tx_chan);
941 dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
942 UART_XMIT_SIZE, DMA_TO_DEVICE);
943 dma_release_channel(dma->tx_chan);
944 dma->tx_chan = NULL;
945 }
946 }
947
948 static void s3c24xx_serial_shutdown(struct uart_port *port)
949 {
950 struct s3c24xx_uart_port *ourport = to_ourport(port);
951
952 if (ourport->tx_claimed) {
953 if (!s3c24xx_serial_has_interrupt_mask(port))
954 free_irq(ourport->tx_irq, ourport);
955 tx_enabled(port) = 0;
956 ourport->tx_claimed = 0;
957 ourport->tx_mode = 0;
958 }
959
960 if (ourport->rx_claimed) {
961 if (!s3c24xx_serial_has_interrupt_mask(port))
962 free_irq(ourport->rx_irq, ourport);
963 ourport->rx_claimed = 0;
964 rx_enabled(port) = 0;
965 }
966
967 /* Clear pending interrupts and mask all interrupts */
968 if (s3c24xx_serial_has_interrupt_mask(port)) {
969 free_irq(port->irq, ourport);
970
971 wr_regl(port, S3C64XX_UINTP, 0xf);
972 wr_regl(port, S3C64XX_UINTM, 0xf);
973 }
974
975 if (ourport->dma)
976 s3c24xx_serial_release_dma(ourport);
977
978 ourport->tx_in_progress = 0;
979 }
980
981 static int s3c24xx_serial_startup(struct uart_port *port)
982 {
983 struct s3c24xx_uart_port *ourport = to_ourport(port);
984 int ret;
985
986 dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n",
987 port, (unsigned long long)port->mapbase, port->membase);
988
989 rx_enabled(port) = 1;
990
991 ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
992 s3c24xx_serial_portname(port), ourport);
993
994 if (ret != 0) {
995 dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
996 return ret;
997 }
998
999 ourport->rx_claimed = 1;
1000
1001 dbg("requesting tx irq...\n");
1002
1003 tx_enabled(port) = 1;
1004
1005 ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
1006 s3c24xx_serial_portname(port), ourport);
1007
1008 if (ret) {
1009 dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
1010 goto err;
1011 }
1012
1013 ourport->tx_claimed = 1;
1014
1015 dbg("s3c24xx_serial_startup ok\n");
1016
1017 /* the port reset code should have done the correct
1018 * register setup for the port controls */
1019
1020 return ret;
1021
1022 err:
1023 s3c24xx_serial_shutdown(port);
1024 return ret;
1025 }
1026
1027 static int s3c64xx_serial_startup(struct uart_port *port)
1028 {
1029 struct s3c24xx_uart_port *ourport = to_ourport(port);
1030 unsigned long flags;
1031 unsigned int ufcon;
1032 int ret;
1033
1034 dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
1035 port, (unsigned long long)port->mapbase, port->membase);
1036
1037 wr_regl(port, S3C64XX_UINTM, 0xf);
1038 if (ourport->dma) {
1039 ret = s3c24xx_serial_request_dma(ourport);
1040 if (ret < 0) {
1041 dev_warn(port->dev, "DMA request failed\n");
1042 return ret;
1043 }
1044 }
1045
1046 ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
1047 s3c24xx_serial_portname(port), ourport);
1048 if (ret) {
1049 dev_err(port->dev, "cannot get irq %d\n", port->irq);
1050 return ret;
1051 }
1052
1053 /* For compatibility with s3c24xx Soc's */
1054 rx_enabled(port) = 1;
1055 ourport->rx_claimed = 1;
1056 tx_enabled(port) = 0;
1057 ourport->tx_claimed = 1;
1058
1059 spin_lock_irqsave(&port->lock, flags);
1060
1061 ufcon = rd_regl(port, S3C2410_UFCON);
1062 ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
1063 if (!uart_console(port))
1064 ufcon |= S3C2410_UFCON_RESETTX;
1065 wr_regl(port, S3C2410_UFCON, ufcon);
1066
1067 enable_rx_pio(ourport);
1068
1069 spin_unlock_irqrestore(&port->lock, flags);
1070
1071 /* Enable Rx Interrupt */
1072 __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM));
1073
1074 dbg("s3c64xx_serial_startup ok\n");
1075 return ret;
1076 }
1077
1078 /* power power management control */
1079
1080 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
1081 unsigned int old)
1082 {
1083 struct s3c24xx_uart_port *ourport = to_ourport(port);
1084 int timeout = 10000;
1085
1086 ourport->pm_level = level;
1087
1088 switch (level) {
1089 case 3:
1090 while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
1091 udelay(100);
1092
1093 if (!IS_ERR(ourport->baudclk))
1094 clk_disable_unprepare(ourport->baudclk);
1095
1096 clk_disable_unprepare(ourport->clk);
1097 break;
1098
1099 case 0:
1100 clk_prepare_enable(ourport->clk);
1101
1102 if (!IS_ERR(ourport->baudclk))
1103 clk_prepare_enable(ourport->baudclk);
1104
1105 break;
1106 default:
1107 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
1108 }
1109 }
1110
1111 /* baud rate calculation
1112 *
1113 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
1114 * of different sources, including the peripheral clock ("pclk") and an
1115 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
1116 * with a programmable extra divisor.
1117 *
1118 * The following code goes through the clock sources, and calculates the
1119 * baud clocks (and the resultant actual baud rates) and then tries to
1120 * pick the closest one and select that.
1121 *
1122 */
1123
1124 #define MAX_CLK_NAME_LENGTH 15
1125
1126 static inline int s3c24xx_serial_getsource(struct uart_port *port)
1127 {
1128 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1129 unsigned int ucon;
1130
1131 if (info->num_clks == 1)
1132 return 0;
1133
1134 ucon = rd_regl(port, S3C2410_UCON);
1135 ucon &= info->clksel_mask;
1136 return ucon >> info->clksel_shift;
1137 }
1138
1139 static void s3c24xx_serial_setsource(struct uart_port *port,
1140 unsigned int clk_sel)
1141 {
1142 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1143 unsigned int ucon;
1144
1145 if (info->num_clks == 1)
1146 return;
1147
1148 ucon = rd_regl(port, S3C2410_UCON);
1149 if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
1150 return;
1151
1152 ucon &= ~info->clksel_mask;
1153 ucon |= clk_sel << info->clksel_shift;
1154 wr_regl(port, S3C2410_UCON, ucon);
1155 }
1156
1157 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
1158 unsigned int req_baud, struct clk **best_clk,
1159 unsigned int *clk_num)
1160 {
1161 struct s3c24xx_uart_info *info = ourport->info;
1162 struct clk *clk;
1163 unsigned long rate;
1164 unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
1165 char clkname[MAX_CLK_NAME_LENGTH];
1166 int calc_deviation, deviation = (1 << 30) - 1;
1167
1168 clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
1169 ourport->info->def_clk_sel;
1170 for (cnt = 0; cnt < info->num_clks; cnt++) {
1171 if (!(clk_sel & (1 << cnt)))
1172 continue;
1173
1174 sprintf(clkname, "clk_uart_baud%d", cnt);
1175 clk = clk_get(ourport->port.dev, clkname);
1176 if (IS_ERR(clk))
1177 continue;
1178
1179 rate = clk_get_rate(clk);
1180 if (!rate)
1181 continue;
1182
1183 if (ourport->info->has_divslot) {
1184 unsigned long div = rate / req_baud;
1185
1186 /* The UDIVSLOT register on the newer UARTs allows us to
1187 * get a divisor adjustment of 1/16th on the baud clock.
1188 *
1189 * We don't keep the UDIVSLOT value (the 16ths we
1190 * calculated by not multiplying the baud by 16) as it
1191 * is easy enough to recalculate.
1192 */
1193
1194 quot = div / 16;
1195 baud = rate / div;
1196 } else {
1197 quot = (rate + (8 * req_baud)) / (16 * req_baud);
1198 baud = rate / (quot * 16);
1199 }
1200 quot--;
1201
1202 calc_deviation = req_baud - baud;
1203 if (calc_deviation < 0)
1204 calc_deviation = -calc_deviation;
1205
1206 if (calc_deviation < deviation) {
1207 *best_clk = clk;
1208 best_quot = quot;
1209 *clk_num = cnt;
1210 deviation = calc_deviation;
1211 }
1212 }
1213
1214 return best_quot;
1215 }
1216
1217 /* udivslot_table[]
1218 *
1219 * This table takes the fractional value of the baud divisor and gives
1220 * the recommended setting for the UDIVSLOT register.
1221 */
1222 static u16 udivslot_table[16] = {
1223 [0] = 0x0000,
1224 [1] = 0x0080,
1225 [2] = 0x0808,
1226 [3] = 0x0888,
1227 [4] = 0x2222,
1228 [5] = 0x4924,
1229 [6] = 0x4A52,
1230 [7] = 0x54AA,
1231 [8] = 0x5555,
1232 [9] = 0xD555,
1233 [10] = 0xD5D5,
1234 [11] = 0xDDD5,
1235 [12] = 0xDDDD,
1236 [13] = 0xDFDD,
1237 [14] = 0xDFDF,
1238 [15] = 0xFFDF,
1239 };
1240
1241 static void s3c24xx_serial_set_termios(struct uart_port *port,
1242 struct ktermios *termios,
1243 struct ktermios *old)
1244 {
1245 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
1246 struct s3c24xx_uart_port *ourport = to_ourport(port);
1247 struct clk *clk = ERR_PTR(-EINVAL);
1248 unsigned long flags;
1249 unsigned int baud, quot, clk_sel = 0;
1250 unsigned int ulcon;
1251 unsigned int umcon;
1252 unsigned int udivslot = 0;
1253
1254 /*
1255 * We don't support modem control lines.
1256 */
1257 termios->c_cflag &= ~(HUPCL | CMSPAR);
1258 termios->c_cflag |= CLOCAL;
1259
1260 /*
1261 * Ask the core to calculate the divisor for us.
1262 */
1263
1264 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
1265 quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
1266 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
1267 quot = port->custom_divisor;
1268 if (IS_ERR(clk))
1269 return;
1270
1271 /* check to see if we need to change clock source */
1272
1273 if (ourport->baudclk != clk) {
1274 clk_prepare_enable(clk);
1275
1276 s3c24xx_serial_setsource(port, clk_sel);
1277
1278 if (!IS_ERR(ourport->baudclk)) {
1279 clk_disable_unprepare(ourport->baudclk);
1280 ourport->baudclk = ERR_PTR(-EINVAL);
1281 }
1282
1283 ourport->baudclk = clk;
1284 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
1285 }
1286
1287 if (ourport->info->has_divslot) {
1288 unsigned int div = ourport->baudclk_rate / baud;
1289
1290 if (cfg->has_fracval) {
1291 udivslot = (div & 15);
1292 dbg("fracval = %04x\n", udivslot);
1293 } else {
1294 udivslot = udivslot_table[div & 15];
1295 dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
1296 }
1297 }
1298
1299 switch (termios->c_cflag & CSIZE) {
1300 case CS5:
1301 dbg("config: 5bits/char\n");
1302 ulcon = S3C2410_LCON_CS5;
1303 break;
1304 case CS6:
1305 dbg("config: 6bits/char\n");
1306 ulcon = S3C2410_LCON_CS6;
1307 break;
1308 case CS7:
1309 dbg("config: 7bits/char\n");
1310 ulcon = S3C2410_LCON_CS7;
1311 break;
1312 case CS8:
1313 default:
1314 dbg("config: 8bits/char\n");
1315 ulcon = S3C2410_LCON_CS8;
1316 break;
1317 }
1318
1319 /* preserve original lcon IR settings */
1320 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
1321
1322 if (termios->c_cflag & CSTOPB)
1323 ulcon |= S3C2410_LCON_STOPB;
1324
1325 if (termios->c_cflag & PARENB) {
1326 if (termios->c_cflag & PARODD)
1327 ulcon |= S3C2410_LCON_PODD;
1328 else
1329 ulcon |= S3C2410_LCON_PEVEN;
1330 } else {
1331 ulcon |= S3C2410_LCON_PNONE;
1332 }
1333
1334 spin_lock_irqsave(&port->lock, flags);
1335
1336 dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
1337 ulcon, quot, udivslot);
1338
1339 wr_regl(port, S3C2410_ULCON, ulcon);
1340 wr_regl(port, S3C2410_UBRDIV, quot);
1341
1342 umcon = rd_regl(port, S3C2410_UMCON);
1343 if (termios->c_cflag & CRTSCTS) {
1344 umcon |= S3C2410_UMCOM_AFC;
1345 /* Disable RTS when RX FIFO contains 63 bytes */
1346 umcon &= ~S3C2412_UMCON_AFC_8;
1347 } else {
1348 umcon &= ~S3C2410_UMCOM_AFC;
1349 }
1350 wr_regl(port, S3C2410_UMCON, umcon);
1351
1352 if (ourport->info->has_divslot)
1353 wr_regl(port, S3C2443_DIVSLOT, udivslot);
1354
1355 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
1356 rd_regl(port, S3C2410_ULCON),
1357 rd_regl(port, S3C2410_UCON),
1358 rd_regl(port, S3C2410_UFCON));
1359
1360 /*
1361 * Update the per-port timeout.
1362 */
1363 uart_update_timeout(port, termios->c_cflag, baud);
1364
1365 /*
1366 * Which character status flags are we interested in?
1367 */
1368 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
1369 if (termios->c_iflag & INPCK)
1370 port->read_status_mask |= S3C2410_UERSTAT_FRAME |
1371 S3C2410_UERSTAT_PARITY;
1372 /*
1373 * Which character status flags should we ignore?
1374 */
1375 port->ignore_status_mask = 0;
1376 if (termios->c_iflag & IGNPAR)
1377 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
1378 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
1379 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
1380
1381 /*
1382 * Ignore all characters if CREAD is not set.
1383 */
1384 if ((termios->c_cflag & CREAD) == 0)
1385 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
1386
1387 spin_unlock_irqrestore(&port->lock, flags);
1388 }
1389
1390 static const char *s3c24xx_serial_type(struct uart_port *port)
1391 {
1392 switch (port->type) {
1393 case PORT_S3C2410:
1394 return "S3C2410";
1395 case PORT_S3C2440:
1396 return "S3C2440";
1397 case PORT_S3C2412:
1398 return "S3C2412";
1399 case PORT_S3C6400:
1400 return "S3C6400/10";
1401 default:
1402 return NULL;
1403 }
1404 }
1405
1406 #define MAP_SIZE (0x100)
1407
1408 static void s3c24xx_serial_release_port(struct uart_port *port)
1409 {
1410 release_mem_region(port->mapbase, MAP_SIZE);
1411 }
1412
1413 static int s3c24xx_serial_request_port(struct uart_port *port)
1414 {
1415 const char *name = s3c24xx_serial_portname(port);
1416 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
1417 }
1418
1419 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
1420 {
1421 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1422
1423 if (flags & UART_CONFIG_TYPE &&
1424 s3c24xx_serial_request_port(port) == 0)
1425 port->type = info->type;
1426 }
1427
1428 /*
1429 * verify the new serial_struct (for TIOCSSERIAL).
1430 */
1431 static int
1432 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
1433 {
1434 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1435
1436 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
1437 return -EINVAL;
1438
1439 return 0;
1440 }
1441
1442
1443 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1444
1445 static struct console s3c24xx_serial_console;
1446
1447 static int __init s3c24xx_serial_console_init(void)
1448 {
1449 register_console(&s3c24xx_serial_console);
1450 return 0;
1451 }
1452 console_initcall(s3c24xx_serial_console_init);
1453
1454 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
1455 #else
1456 #define S3C24XX_SERIAL_CONSOLE NULL
1457 #endif
1458
1459 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1460 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
1461 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1462 unsigned char c);
1463 #endif
1464
1465 static struct uart_ops s3c24xx_serial_ops = {
1466 .pm = s3c24xx_serial_pm,
1467 .tx_empty = s3c24xx_serial_tx_empty,
1468 .get_mctrl = s3c24xx_serial_get_mctrl,
1469 .set_mctrl = s3c24xx_serial_set_mctrl,
1470 .stop_tx = s3c24xx_serial_stop_tx,
1471 .start_tx = s3c24xx_serial_start_tx,
1472 .stop_rx = s3c24xx_serial_stop_rx,
1473 .break_ctl = s3c24xx_serial_break_ctl,
1474 .startup = s3c24xx_serial_startup,
1475 .shutdown = s3c24xx_serial_shutdown,
1476 .set_termios = s3c24xx_serial_set_termios,
1477 .type = s3c24xx_serial_type,
1478 .release_port = s3c24xx_serial_release_port,
1479 .request_port = s3c24xx_serial_request_port,
1480 .config_port = s3c24xx_serial_config_port,
1481 .verify_port = s3c24xx_serial_verify_port,
1482 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
1483 .poll_get_char = s3c24xx_serial_get_poll_char,
1484 .poll_put_char = s3c24xx_serial_put_poll_char,
1485 #endif
1486 };
1487
1488 static struct uart_driver s3c24xx_uart_drv = {
1489 .owner = THIS_MODULE,
1490 .driver_name = "s3c2410_serial",
1491 .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
1492 .cons = S3C24XX_SERIAL_CONSOLE,
1493 .dev_name = S3C24XX_SERIAL_NAME,
1494 .major = S3C24XX_SERIAL_MAJOR,
1495 .minor = S3C24XX_SERIAL_MINOR,
1496 };
1497
1498 #define __PORT_LOCK_UNLOCKED(i) \
1499 __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
1500 static struct s3c24xx_uart_port
1501 s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
1502 [0] = {
1503 .port = {
1504 .lock = __PORT_LOCK_UNLOCKED(0),
1505 .iotype = UPIO_MEM,
1506 .uartclk = 0,
1507 .fifosize = 16,
1508 .ops = &s3c24xx_serial_ops,
1509 .flags = UPF_BOOT_AUTOCONF,
1510 .line = 0,
1511 }
1512 },
1513 [1] = {
1514 .port = {
1515 .lock = __PORT_LOCK_UNLOCKED(1),
1516 .iotype = UPIO_MEM,
1517 .uartclk = 0,
1518 .fifosize = 16,
1519 .ops = &s3c24xx_serial_ops,
1520 .flags = UPF_BOOT_AUTOCONF,
1521 .line = 1,
1522 }
1523 },
1524 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
1525
1526 [2] = {
1527 .port = {
1528 .lock = __PORT_LOCK_UNLOCKED(2),
1529 .iotype = UPIO_MEM,
1530 .uartclk = 0,
1531 .fifosize = 16,
1532 .ops = &s3c24xx_serial_ops,
1533 .flags = UPF_BOOT_AUTOCONF,
1534 .line = 2,
1535 }
1536 },
1537 #endif
1538 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
1539 [3] = {
1540 .port = {
1541 .lock = __PORT_LOCK_UNLOCKED(3),
1542 .iotype = UPIO_MEM,
1543 .uartclk = 0,
1544 .fifosize = 16,
1545 .ops = &s3c24xx_serial_ops,
1546 .flags = UPF_BOOT_AUTOCONF,
1547 .line = 3,
1548 }
1549 }
1550 #endif
1551 };
1552 #undef __PORT_LOCK_UNLOCKED
1553
1554 /* s3c24xx_serial_resetport
1555 *
1556 * reset the fifos and other the settings.
1557 */
1558
1559 static void s3c24xx_serial_resetport(struct uart_port *port,
1560 struct s3c2410_uartcfg *cfg)
1561 {
1562 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1563 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1564 unsigned int ucon_mask;
1565
1566 ucon_mask = info->clksel_mask;
1567 if (info->type == PORT_S3C2440)
1568 ucon_mask |= S3C2440_UCON0_DIVMASK;
1569
1570 ucon &= ucon_mask;
1571 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1572
1573 /* reset both fifos */
1574 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1575 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1576
1577 /* some delay is required after fifo reset */
1578 udelay(1);
1579 }
1580
1581
1582 #ifdef CONFIG_CPU_FREQ
1583
1584 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
1585 unsigned long val, void *data)
1586 {
1587 struct s3c24xx_uart_port *port;
1588 struct uart_port *uport;
1589
1590 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1591 uport = &port->port;
1592
1593 /* check to see if port is enabled */
1594
1595 if (port->pm_level != 0)
1596 return 0;
1597
1598 /* try and work out if the baudrate is changing, we can detect
1599 * a change in rate, but we do not have support for detecting
1600 * a disturbance in the clock-rate over the change.
1601 */
1602
1603 if (IS_ERR(port->baudclk))
1604 goto exit;
1605
1606 if (port->baudclk_rate == clk_get_rate(port->baudclk))
1607 goto exit;
1608
1609 if (val == CPUFREQ_PRECHANGE) {
1610 /* we should really shut the port down whilst the
1611 * frequency change is in progress. */
1612
1613 } else if (val == CPUFREQ_POSTCHANGE) {
1614 struct ktermios *termios;
1615 struct tty_struct *tty;
1616
1617 if (uport->state == NULL)
1618 goto exit;
1619
1620 tty = uport->state->port.tty;
1621
1622 if (tty == NULL)
1623 goto exit;
1624
1625 termios = &tty->termios;
1626
1627 if (termios == NULL) {
1628 dev_warn(uport->dev, "%s: no termios?\n", __func__);
1629 goto exit;
1630 }
1631
1632 s3c24xx_serial_set_termios(uport, termios, NULL);
1633 }
1634
1635 exit:
1636 return 0;
1637 }
1638
1639 static inline int
1640 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1641 {
1642 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1643
1644 return cpufreq_register_notifier(&port->freq_transition,
1645 CPUFREQ_TRANSITION_NOTIFIER);
1646 }
1647
1648 static inline void
1649 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1650 {
1651 cpufreq_unregister_notifier(&port->freq_transition,
1652 CPUFREQ_TRANSITION_NOTIFIER);
1653 }
1654
1655 #else
1656 static inline int
1657 s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1658 {
1659 return 0;
1660 }
1661
1662 static inline void
1663 s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1664 {
1665 }
1666 #endif
1667
1668 /* s3c24xx_serial_init_port
1669 *
1670 * initialise a single serial port from the platform device given
1671 */
1672
1673 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1674 struct platform_device *platdev)
1675 {
1676 struct uart_port *port = &ourport->port;
1677 struct s3c2410_uartcfg *cfg = ourport->cfg;
1678 struct resource *res;
1679 int ret;
1680
1681 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1682
1683 if (platdev == NULL)
1684 return -ENODEV;
1685
1686 if (port->mapbase != 0)
1687 return 0;
1688
1689 /* setup info for port */
1690 port->dev = &platdev->dev;
1691
1692 /* Startup sequence is different for s3c64xx and higher SoC's */
1693 if (s3c24xx_serial_has_interrupt_mask(port))
1694 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1695
1696 port->uartclk = 1;
1697
1698 if (cfg->uart_flags & UPF_CONS_FLOW) {
1699 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1700 port->flags |= UPF_CONS_FLOW;
1701 }
1702
1703 /* sort our the physical and virtual addresses for each UART */
1704
1705 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1706 if (res == NULL) {
1707 dev_err(port->dev, "failed to find memory resource for uart\n");
1708 return -EINVAL;
1709 }
1710
1711 dbg("resource %pR)\n", res);
1712
1713 port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
1714 if (!port->membase) {
1715 dev_err(port->dev, "failed to remap controller address\n");
1716 return -EBUSY;
1717 }
1718
1719 port->mapbase = res->start;
1720 ret = platform_get_irq(platdev, 0);
1721 if (ret < 0)
1722 port->irq = 0;
1723 else {
1724 port->irq = ret;
1725 ourport->rx_irq = ret;
1726 ourport->tx_irq = ret + 1;
1727 }
1728
1729 ret = platform_get_irq(platdev, 1);
1730 if (ret > 0)
1731 ourport->tx_irq = ret;
1732 /*
1733 * DMA is currently supported only on DT platforms, if DMA properties
1734 * are specified.
1735 */
1736 if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
1737 "dmas", NULL)) {
1738 ourport->dma = devm_kzalloc(port->dev,
1739 sizeof(*ourport->dma),
1740 GFP_KERNEL);
1741 if (!ourport->dma)
1742 return -ENOMEM;
1743 }
1744
1745 ourport->clk = clk_get(&platdev->dev, "uart");
1746 if (IS_ERR(ourport->clk)) {
1747 pr_err("%s: Controller clock not found\n",
1748 dev_name(&platdev->dev));
1749 return PTR_ERR(ourport->clk);
1750 }
1751
1752 ret = clk_prepare_enable(ourport->clk);
1753 if (ret) {
1754 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1755 clk_put(ourport->clk);
1756 return ret;
1757 }
1758
1759 /* Keep all interrupts masked and cleared */
1760 if (s3c24xx_serial_has_interrupt_mask(port)) {
1761 wr_regl(port, S3C64XX_UINTM, 0xf);
1762 wr_regl(port, S3C64XX_UINTP, 0xf);
1763 wr_regl(port, S3C64XX_UINTSP, 0xf);
1764 }
1765
1766 dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
1767 &port->mapbase, port->membase, port->irq,
1768 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1769
1770 /* reset the fifos (and setup the uart) */
1771 s3c24xx_serial_resetport(port, cfg);
1772 return 0;
1773 }
1774
1775 /* Device driver serial port probe */
1776
1777 static const struct of_device_id s3c24xx_uart_dt_match[];
1778 static int probe_index;
1779
1780 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1781 struct platform_device *pdev)
1782 {
1783 #ifdef CONFIG_OF
1784 if (pdev->dev.of_node) {
1785 const struct of_device_id *match;
1786 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1787 return (struct s3c24xx_serial_drv_data *)match->data;
1788 }
1789 #endif
1790 return (struct s3c24xx_serial_drv_data *)
1791 platform_get_device_id(pdev)->driver_data;
1792 }
1793
1794 static int s3c24xx_serial_probe(struct platform_device *pdev)
1795 {
1796 struct device_node *np = pdev->dev.of_node;
1797 struct s3c24xx_uart_port *ourport;
1798 int index = probe_index;
1799 int ret;
1800
1801 if (np) {
1802 ret = of_alias_get_id(np, "serial");
1803 if (ret >= 0)
1804 index = ret;
1805 }
1806
1807 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index);
1808
1809 ourport = &s3c24xx_serial_ports[index];
1810
1811 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1812 if (!ourport->drv_data) {
1813 dev_err(&pdev->dev, "could not find driver data\n");
1814 return -ENODEV;
1815 }
1816
1817 ourport->baudclk = ERR_PTR(-EINVAL);
1818 ourport->info = ourport->drv_data->info;
1819 ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1820 dev_get_platdata(&pdev->dev) :
1821 ourport->drv_data->def_cfg;
1822
1823 if (np)
1824 of_property_read_u32(np,
1825 "samsung,uart-fifosize", &ourport->port.fifosize);
1826
1827 if (ourport->drv_data->fifosize[index])
1828 ourport->port.fifosize = ourport->drv_data->fifosize[index];
1829 else if (ourport->info->fifosize)
1830 ourport->port.fifosize = ourport->info->fifosize;
1831
1832 /*
1833 * DMA transfers must be aligned at least to cache line size,
1834 * so find minimal transfer size suitable for DMA mode
1835 */
1836 ourport->min_dma_size = max_t(int, ourport->port.fifosize,
1837 dma_get_cache_alignment());
1838
1839 probe_index++;
1840
1841 dbg("%s: initialising port %p...\n", __func__, ourport);
1842
1843 ret = s3c24xx_serial_init_port(ourport, pdev);
1844 if (ret < 0)
1845 return ret;
1846
1847 if (!s3c24xx_uart_drv.state) {
1848 ret = uart_register_driver(&s3c24xx_uart_drv);
1849 if (ret < 0) {
1850 pr_err("Failed to register Samsung UART driver\n");
1851 return ret;
1852 }
1853 }
1854
1855 dbg("%s: adding port\n", __func__);
1856 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1857 platform_set_drvdata(pdev, &ourport->port);
1858
1859 /*
1860 * Deactivate the clock enabled in s3c24xx_serial_init_port here,
1861 * so that a potential re-enablement through the pm-callback overlaps
1862 * and keeps the clock enabled in this case.
1863 */
1864 clk_disable_unprepare(ourport->clk);
1865
1866 ret = s3c24xx_serial_cpufreq_register(ourport);
1867 if (ret < 0)
1868 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1869
1870 return 0;
1871 }
1872
1873 static int s3c24xx_serial_remove(struct platform_device *dev)
1874 {
1875 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1876
1877 if (port) {
1878 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1879 uart_remove_one_port(&s3c24xx_uart_drv, port);
1880 }
1881
1882 uart_unregister_driver(&s3c24xx_uart_drv);
1883
1884 return 0;
1885 }
1886
1887 /* UART power management code */
1888 #ifdef CONFIG_PM_SLEEP
1889 static int s3c24xx_serial_suspend(struct device *dev)
1890 {
1891 struct uart_port *port = s3c24xx_dev_to_port(dev);
1892
1893 if (port)
1894 uart_suspend_port(&s3c24xx_uart_drv, port);
1895
1896 return 0;
1897 }
1898
1899 static int s3c24xx_serial_resume(struct device *dev)
1900 {
1901 struct uart_port *port = s3c24xx_dev_to_port(dev);
1902 struct s3c24xx_uart_port *ourport = to_ourport(port);
1903
1904 if (port) {
1905 clk_prepare_enable(ourport->clk);
1906 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1907 clk_disable_unprepare(ourport->clk);
1908
1909 uart_resume_port(&s3c24xx_uart_drv, port);
1910 }
1911
1912 return 0;
1913 }
1914
1915 static int s3c24xx_serial_resume_noirq(struct device *dev)
1916 {
1917 struct uart_port *port = s3c24xx_dev_to_port(dev);
1918
1919 if (port) {
1920 /* restore IRQ mask */
1921 if (s3c24xx_serial_has_interrupt_mask(port)) {
1922 unsigned int uintm = 0xf;
1923 if (tx_enabled(port))
1924 uintm &= ~S3C64XX_UINTM_TXD_MSK;
1925 if (rx_enabled(port))
1926 uintm &= ~S3C64XX_UINTM_RXD_MSK;
1927 wr_regl(port, S3C64XX_UINTM, uintm);
1928 }
1929 }
1930
1931 return 0;
1932 }
1933
1934 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1935 .suspend = s3c24xx_serial_suspend,
1936 .resume = s3c24xx_serial_resume,
1937 .resume_noirq = s3c24xx_serial_resume_noirq,
1938 };
1939 #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1940
1941 #else /* !CONFIG_PM_SLEEP */
1942
1943 #define SERIAL_SAMSUNG_PM_OPS NULL
1944 #endif /* CONFIG_PM_SLEEP */
1945
1946 /* Console code */
1947
1948 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1949
1950 static struct uart_port *cons_uart;
1951
1952 static int
1953 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1954 {
1955 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1956 unsigned long ufstat, utrstat;
1957
1958 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1959 /* fifo mode - check amount of data in fifo registers... */
1960
1961 ufstat = rd_regl(port, S3C2410_UFSTAT);
1962 return (ufstat & info->tx_fifofull) ? 0 : 1;
1963 }
1964
1965 /* in non-fifo mode, we go and use the tx buffer empty */
1966
1967 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1968 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1969 }
1970
1971 static bool
1972 s3c24xx_port_configured(unsigned int ucon)
1973 {
1974 /* consider the serial port configured if the tx/rx mode set */
1975 return (ucon & 0xf) != 0;
1976 }
1977
1978 #ifdef CONFIG_CONSOLE_POLL
1979 /*
1980 * Console polling routines for writing and reading from the uart while
1981 * in an interrupt or debug context.
1982 */
1983
1984 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
1985 {
1986 struct s3c24xx_uart_port *ourport = to_ourport(port);
1987 unsigned int ufstat;
1988
1989 ufstat = rd_regl(port, S3C2410_UFSTAT);
1990 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
1991 return NO_POLL_CHAR;
1992
1993 return rd_regb(port, S3C2410_URXH);
1994 }
1995
1996 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1997 unsigned char c)
1998 {
1999 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2000 unsigned int ucon = rd_regl(port, S3C2410_UCON);
2001
2002 /* not possible to xmit on unconfigured port */
2003 if (!s3c24xx_port_configured(ucon))
2004 return;
2005
2006 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2007 cpu_relax();
2008 wr_regb(port, S3C2410_UTXH, c);
2009 }
2010
2011 #endif /* CONFIG_CONSOLE_POLL */
2012
2013 static void
2014 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
2015 {
2016 unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
2017
2018 while (!s3c24xx_serial_console_txrdy(port, ufcon))
2019 cpu_relax();
2020 wr_regb(port, S3C2410_UTXH, ch);
2021 }
2022
2023 static void
2024 s3c24xx_serial_console_write(struct console *co, const char *s,
2025 unsigned int count)
2026 {
2027 unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
2028
2029 /* not possible to xmit on unconfigured port */
2030 if (!s3c24xx_port_configured(ucon))
2031 return;
2032
2033 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
2034 }
2035
2036 static void __init
2037 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
2038 int *parity, int *bits)
2039 {
2040 struct clk *clk;
2041 unsigned int ulcon;
2042 unsigned int ucon;
2043 unsigned int ubrdiv;
2044 unsigned long rate;
2045 unsigned int clk_sel;
2046 char clk_name[MAX_CLK_NAME_LENGTH];
2047
2048 ulcon = rd_regl(port, S3C2410_ULCON);
2049 ucon = rd_regl(port, S3C2410_UCON);
2050 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
2051
2052 dbg("s3c24xx_serial_get_options: port=%p\n"
2053 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
2054 port, ulcon, ucon, ubrdiv);
2055
2056 if (s3c24xx_port_configured(ucon)) {
2057 switch (ulcon & S3C2410_LCON_CSMASK) {
2058 case S3C2410_LCON_CS5:
2059 *bits = 5;
2060 break;
2061 case S3C2410_LCON_CS6:
2062 *bits = 6;
2063 break;
2064 case S3C2410_LCON_CS7:
2065 *bits = 7;
2066 break;
2067 case S3C2410_LCON_CS8:
2068 default:
2069 *bits = 8;
2070 break;
2071 }
2072
2073 switch (ulcon & S3C2410_LCON_PMASK) {
2074 case S3C2410_LCON_PEVEN:
2075 *parity = 'e';
2076 break;
2077
2078 case S3C2410_LCON_PODD:
2079 *parity = 'o';
2080 break;
2081
2082 case S3C2410_LCON_PNONE:
2083 default:
2084 *parity = 'n';
2085 }
2086
2087 /* now calculate the baud rate */
2088
2089 clk_sel = s3c24xx_serial_getsource(port);
2090 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
2091
2092 clk = clk_get(port->dev, clk_name);
2093 if (!IS_ERR(clk))
2094 rate = clk_get_rate(clk);
2095 else
2096 rate = 1;
2097
2098 *baud = rate / (16 * (ubrdiv + 1));
2099 dbg("calculated baud %d\n", *baud);
2100 }
2101
2102 }
2103
2104 static int __init
2105 s3c24xx_serial_console_setup(struct console *co, char *options)
2106 {
2107 struct uart_port *port;
2108 int baud = 9600;
2109 int bits = 8;
2110 int parity = 'n';
2111 int flow = 'n';
2112
2113 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
2114 co, co->index, options);
2115
2116 /* is this a valid port */
2117
2118 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
2119 co->index = 0;
2120
2121 port = &s3c24xx_serial_ports[co->index].port;
2122
2123 /* is the port configured? */
2124
2125 if (port->mapbase == 0x0)
2126 return -ENODEV;
2127
2128 cons_uart = port;
2129
2130 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
2131
2132 /*
2133 * Check whether an invalid uart number has been specified, and
2134 * if so, search for the first available port that does have
2135 * console support.
2136 */
2137 if (options)
2138 uart_parse_options(options, &baud, &parity, &bits, &flow);
2139 else
2140 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
2141
2142 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
2143
2144 return uart_set_options(port, co, baud, parity, bits, flow);
2145 }
2146
2147 static struct console s3c24xx_serial_console = {
2148 .name = S3C24XX_SERIAL_NAME,
2149 .device = uart_console_device,
2150 .flags = CON_PRINTBUFFER,
2151 .index = -1,
2152 .write = s3c24xx_serial_console_write,
2153 .setup = s3c24xx_serial_console_setup,
2154 .data = &s3c24xx_uart_drv,
2155 };
2156 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
2157
2158 #ifdef CONFIG_CPU_S3C2410
2159 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
2160 .info = &(struct s3c24xx_uart_info) {
2161 .name = "Samsung S3C2410 UART",
2162 .type = PORT_S3C2410,
2163 .fifosize = 16,
2164 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
2165 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
2166 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
2167 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
2168 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
2169 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
2170 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2171 .num_clks = 2,
2172 .clksel_mask = S3C2410_UCON_CLKMASK,
2173 .clksel_shift = S3C2410_UCON_CLKSHIFT,
2174 },
2175 .def_cfg = &(struct s3c2410_uartcfg) {
2176 .ucon = S3C2410_UCON_DEFAULT,
2177 .ufcon = S3C2410_UFCON_DEFAULT,
2178 },
2179 };
2180 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
2181 #else
2182 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2183 #endif
2184
2185 #ifdef CONFIG_CPU_S3C2412
2186 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
2187 .info = &(struct s3c24xx_uart_info) {
2188 .name = "Samsung S3C2412 UART",
2189 .type = PORT_S3C2412,
2190 .fifosize = 64,
2191 .has_divslot = 1,
2192 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2193 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2194 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2195 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2196 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2197 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2198 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2199 .num_clks = 4,
2200 .clksel_mask = S3C2412_UCON_CLKMASK,
2201 .clksel_shift = S3C2412_UCON_CLKSHIFT,
2202 },
2203 .def_cfg = &(struct s3c2410_uartcfg) {
2204 .ucon = S3C2410_UCON_DEFAULT,
2205 .ufcon = S3C2410_UFCON_DEFAULT,
2206 },
2207 };
2208 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
2209 #else
2210 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2211 #endif
2212
2213 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
2214 defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
2215 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
2216 .info = &(struct s3c24xx_uart_info) {
2217 .name = "Samsung S3C2440 UART",
2218 .type = PORT_S3C2440,
2219 .fifosize = 64,
2220 .has_divslot = 1,
2221 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2222 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2223 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2224 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2225 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2226 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2227 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2228 .num_clks = 4,
2229 .clksel_mask = S3C2412_UCON_CLKMASK,
2230 .clksel_shift = S3C2412_UCON_CLKSHIFT,
2231 },
2232 .def_cfg = &(struct s3c2410_uartcfg) {
2233 .ucon = S3C2410_UCON_DEFAULT,
2234 .ufcon = S3C2410_UFCON_DEFAULT,
2235 },
2236 };
2237 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
2238 #else
2239 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2240 #endif
2241
2242 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
2243 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
2244 .info = &(struct s3c24xx_uart_info) {
2245 .name = "Samsung S3C6400 UART",
2246 .type = PORT_S3C6400,
2247 .fifosize = 64,
2248 .has_divslot = 1,
2249 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
2250 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
2251 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
2252 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
2253 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
2254 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
2255 .def_clk_sel = S3C2410_UCON_CLKSEL2,
2256 .num_clks = 4,
2257 .clksel_mask = S3C6400_UCON_CLKMASK,
2258 .clksel_shift = S3C6400_UCON_CLKSHIFT,
2259 },
2260 .def_cfg = &(struct s3c2410_uartcfg) {
2261 .ucon = S3C2410_UCON_DEFAULT,
2262 .ufcon = S3C2410_UFCON_DEFAULT,
2263 },
2264 };
2265 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
2266 #else
2267 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2268 #endif
2269
2270 #ifdef CONFIG_CPU_S5PV210
2271 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
2272 .info = &(struct s3c24xx_uart_info) {
2273 .name = "Samsung S5PV210 UART",
2274 .type = PORT_S3C6400,
2275 .has_divslot = 1,
2276 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
2277 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
2278 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
2279 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
2280 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
2281 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
2282 .def_clk_sel = S3C2410_UCON_CLKSEL0,
2283 .num_clks = 2,
2284 .clksel_mask = S5PV210_UCON_CLKMASK,
2285 .clksel_shift = S5PV210_UCON_CLKSHIFT,
2286 },
2287 .def_cfg = &(struct s3c2410_uartcfg) {
2288 .ucon = S5PV210_UCON_DEFAULT,
2289 .ufcon = S5PV210_UFCON_DEFAULT,
2290 },
2291 .fifosize = { 256, 64, 16, 16 },
2292 };
2293 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
2294 #else
2295 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2296 #endif
2297
2298 #if defined(CONFIG_ARCH_EXYNOS)
2299 #define EXYNOS_COMMON_SERIAL_DRV_DATA \
2300 .info = &(struct s3c24xx_uart_info) { \
2301 .name = "Samsung Exynos UART", \
2302 .type = PORT_S3C6400, \
2303 .has_divslot = 1, \
2304 .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
2305 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
2306 .rx_fifofull = S5PV210_UFSTAT_RXFULL, \
2307 .tx_fifofull = S5PV210_UFSTAT_TXFULL, \
2308 .tx_fifomask = S5PV210_UFSTAT_TXMASK, \
2309 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \
2310 .def_clk_sel = S3C2410_UCON_CLKSEL0, \
2311 .num_clks = 1, \
2312 .clksel_mask = 0, \
2313 .clksel_shift = 0, \
2314 }, \
2315 .def_cfg = &(struct s3c2410_uartcfg) { \
2316 .ucon = S5PV210_UCON_DEFAULT, \
2317 .ufcon = S5PV210_UFCON_DEFAULT, \
2318 .has_fracval = 1, \
2319 } \
2320
2321 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
2322 EXYNOS_COMMON_SERIAL_DRV_DATA,
2323 .fifosize = { 256, 64, 16, 16 },
2324 };
2325
2326 static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
2327 EXYNOS_COMMON_SERIAL_DRV_DATA,
2328 .fifosize = { 64, 256, 16, 256 },
2329 };
2330
2331 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
2332 #define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
2333 #else
2334 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2335 #define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
2336 #endif
2337
2338 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
2339 {
2340 .name = "s3c2410-uart",
2341 .driver_data = S3C2410_SERIAL_DRV_DATA,
2342 }, {
2343 .name = "s3c2412-uart",
2344 .driver_data = S3C2412_SERIAL_DRV_DATA,
2345 }, {
2346 .name = "s3c2440-uart",
2347 .driver_data = S3C2440_SERIAL_DRV_DATA,
2348 }, {
2349 .name = "s3c6400-uart",
2350 .driver_data = S3C6400_SERIAL_DRV_DATA,
2351 }, {
2352 .name = "s5pv210-uart",
2353 .driver_data = S5PV210_SERIAL_DRV_DATA,
2354 }, {
2355 .name = "exynos4210-uart",
2356 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
2357 }, {
2358 .name = "exynos5433-uart",
2359 .driver_data = EXYNOS5433_SERIAL_DRV_DATA,
2360 },
2361 { },
2362 };
2363 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
2364
2365 #ifdef CONFIG_OF
2366 static const struct of_device_id s3c24xx_uart_dt_match[] = {
2367 { .compatible = "samsung,s3c2410-uart",
2368 .data = (void *)S3C2410_SERIAL_DRV_DATA },
2369 { .compatible = "samsung,s3c2412-uart",
2370 .data = (void *)S3C2412_SERIAL_DRV_DATA },
2371 { .compatible = "samsung,s3c2440-uart",
2372 .data = (void *)S3C2440_SERIAL_DRV_DATA },
2373 { .compatible = "samsung,s3c6400-uart",
2374 .data = (void *)S3C6400_SERIAL_DRV_DATA },
2375 { .compatible = "samsung,s5pv210-uart",
2376 .data = (void *)S5PV210_SERIAL_DRV_DATA },
2377 { .compatible = "samsung,exynos4210-uart",
2378 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
2379 { .compatible = "samsung,exynos5433-uart",
2380 .data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
2381 {},
2382 };
2383 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
2384 #endif
2385
2386 static struct platform_driver samsung_serial_driver = {
2387 .probe = s3c24xx_serial_probe,
2388 .remove = s3c24xx_serial_remove,
2389 .id_table = s3c24xx_serial_driver_ids,
2390 .driver = {
2391 .name = "samsung-uart",
2392 .pm = SERIAL_SAMSUNG_PM_OPS,
2393 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
2394 },
2395 };
2396
2397 module_platform_driver(samsung_serial_driver);
2398
2399 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
2400 /*
2401 * Early console.
2402 */
2403
2404 struct samsung_early_console_data {
2405 u32 txfull_mask;
2406 };
2407
2408 static void samsung_early_busyuart(struct uart_port *port)
2409 {
2410 while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
2411 ;
2412 }
2413
2414 static void samsung_early_busyuart_fifo(struct uart_port *port)
2415 {
2416 struct samsung_early_console_data *data = port->private_data;
2417
2418 while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
2419 ;
2420 }
2421
2422 static void samsung_early_putc(struct uart_port *port, int c)
2423 {
2424 if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
2425 samsung_early_busyuart_fifo(port);
2426 else
2427 samsung_early_busyuart(port);
2428
2429 writeb(c, port->membase + S3C2410_UTXH);
2430 }
2431
2432 static void samsung_early_write(struct console *con, const char *s, unsigned n)
2433 {
2434 struct earlycon_device *dev = con->data;
2435
2436 uart_console_write(&dev->port, s, n, samsung_early_putc);
2437 }
2438
2439 static int __init samsung_early_console_setup(struct earlycon_device *device,
2440 const char *opt)
2441 {
2442 if (!device->port.membase)
2443 return -ENODEV;
2444
2445 device->con->write = samsung_early_write;
2446 return 0;
2447 }
2448
2449 /* S3C2410 */
2450 static struct samsung_early_console_data s3c2410_early_console_data = {
2451 .txfull_mask = S3C2410_UFSTAT_TXFULL,
2452 };
2453
2454 static int __init s3c2410_early_console_setup(struct earlycon_device *device,
2455 const char *opt)
2456 {
2457 device->port.private_data = &s3c2410_early_console_data;
2458 return samsung_early_console_setup(device, opt);
2459 }
2460 OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
2461 s3c2410_early_console_setup);
2462
2463 /* S3C2412, S3C2440, S3C64xx */
2464 static struct samsung_early_console_data s3c2440_early_console_data = {
2465 .txfull_mask = S3C2440_UFSTAT_TXFULL,
2466 };
2467
2468 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
2469 const char *opt)
2470 {
2471 device->port.private_data = &s3c2440_early_console_data;
2472 return samsung_early_console_setup(device, opt);
2473 }
2474 OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
2475 s3c2440_early_console_setup);
2476 OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
2477 s3c2440_early_console_setup);
2478 OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
2479 s3c2440_early_console_setup);
2480
2481 /* S5PV210, EXYNOS */
2482 static struct samsung_early_console_data s5pv210_early_console_data = {
2483 .txfull_mask = S5PV210_UFSTAT_TXFULL,
2484 };
2485
2486 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
2487 const char *opt)
2488 {
2489 device->port.private_data = &s5pv210_early_console_data;
2490 return samsung_early_console_setup(device, opt);
2491 }
2492 OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
2493 s5pv210_early_console_setup);
2494 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
2495 s5pv210_early_console_setup);
2496 #endif
2497
2498 MODULE_ALIAS("platform:samsung-uart");
2499 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
2500 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
2501 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support