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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / drivers / tty / serial / fsl_lpuart.c
1 /*
2 * Freescale lpuart serial port driver
3 *
4 * Copyright 2012-2014 Freescale Semiconductor, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #if defined(CONFIG_SERIAL_FSL_LPUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
13 #define SUPPORT_SYSRQ
14 #endif
15
16 #include <linux/clk.h>
17 #include <linux/console.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/dmaengine.h>
20 #include <linux/dmapool.h>
21 #include <linux/io.h>
22 #include <linux/irq.h>
23 #include <linux/module.h>
24 #include <linux/of.h>
25 #include <linux/of_device.h>
26 #include <linux/of_dma.h>
27 #include <linux/serial_core.h>
28 #include <linux/slab.h>
29 #include <linux/tty_flip.h>
30
31 /* All registers are 8-bit width */
32 #define UARTBDH 0x00
33 #define UARTBDL 0x01
34 #define UARTCR1 0x02
35 #define UARTCR2 0x03
36 #define UARTSR1 0x04
37 #define UARTCR3 0x06
38 #define UARTDR 0x07
39 #define UARTCR4 0x0a
40 #define UARTCR5 0x0b
41 #define UARTMODEM 0x0d
42 #define UARTPFIFO 0x10
43 #define UARTCFIFO 0x11
44 #define UARTSFIFO 0x12
45 #define UARTTWFIFO 0x13
46 #define UARTTCFIFO 0x14
47 #define UARTRWFIFO 0x15
48
49 #define UARTBDH_LBKDIE 0x80
50 #define UARTBDH_RXEDGIE 0x40
51 #define UARTBDH_SBR_MASK 0x1f
52
53 #define UARTCR1_LOOPS 0x80
54 #define UARTCR1_RSRC 0x20
55 #define UARTCR1_M 0x10
56 #define UARTCR1_WAKE 0x08
57 #define UARTCR1_ILT 0x04
58 #define UARTCR1_PE 0x02
59 #define UARTCR1_PT 0x01
60
61 #define UARTCR2_TIE 0x80
62 #define UARTCR2_TCIE 0x40
63 #define UARTCR2_RIE 0x20
64 #define UARTCR2_ILIE 0x10
65 #define UARTCR2_TE 0x08
66 #define UARTCR2_RE 0x04
67 #define UARTCR2_RWU 0x02
68 #define UARTCR2_SBK 0x01
69
70 #define UARTSR1_TDRE 0x80
71 #define UARTSR1_TC 0x40
72 #define UARTSR1_RDRF 0x20
73 #define UARTSR1_IDLE 0x10
74 #define UARTSR1_OR 0x08
75 #define UARTSR1_NF 0x04
76 #define UARTSR1_FE 0x02
77 #define UARTSR1_PE 0x01
78
79 #define UARTCR3_R8 0x80
80 #define UARTCR3_T8 0x40
81 #define UARTCR3_TXDIR 0x20
82 #define UARTCR3_TXINV 0x10
83 #define UARTCR3_ORIE 0x08
84 #define UARTCR3_NEIE 0x04
85 #define UARTCR3_FEIE 0x02
86 #define UARTCR3_PEIE 0x01
87
88 #define UARTCR4_MAEN1 0x80
89 #define UARTCR4_MAEN2 0x40
90 #define UARTCR4_M10 0x20
91 #define UARTCR4_BRFA_MASK 0x1f
92 #define UARTCR4_BRFA_OFF 0
93
94 #define UARTCR5_TDMAS 0x80
95 #define UARTCR5_RDMAS 0x20
96
97 #define UARTMODEM_RXRTSE 0x08
98 #define UARTMODEM_TXRTSPOL 0x04
99 #define UARTMODEM_TXRTSE 0x02
100 #define UARTMODEM_TXCTSE 0x01
101
102 #define UARTPFIFO_TXFE 0x80
103 #define UARTPFIFO_FIFOSIZE_MASK 0x7
104 #define UARTPFIFO_TXSIZE_OFF 4
105 #define UARTPFIFO_RXFE 0x08
106 #define UARTPFIFO_RXSIZE_OFF 0
107
108 #define UARTCFIFO_TXFLUSH 0x80
109 #define UARTCFIFO_RXFLUSH 0x40
110 #define UARTCFIFO_RXOFE 0x04
111 #define UARTCFIFO_TXOFE 0x02
112 #define UARTCFIFO_RXUFE 0x01
113
114 #define UARTSFIFO_TXEMPT 0x80
115 #define UARTSFIFO_RXEMPT 0x40
116 #define UARTSFIFO_RXOF 0x04
117 #define UARTSFIFO_TXOF 0x02
118 #define UARTSFIFO_RXUF 0x01
119
120 /* 32-bit register defination */
121 #define UARTBAUD 0x00
122 #define UARTSTAT 0x04
123 #define UARTCTRL 0x08
124 #define UARTDATA 0x0C
125 #define UARTMATCH 0x10
126 #define UARTMODIR 0x14
127 #define UARTFIFO 0x18
128 #define UARTWATER 0x1c
129
130 #define UARTBAUD_MAEN1 0x80000000
131 #define UARTBAUD_MAEN2 0x40000000
132 #define UARTBAUD_M10 0x20000000
133 #define UARTBAUD_TDMAE 0x00800000
134 #define UARTBAUD_RDMAE 0x00200000
135 #define UARTBAUD_MATCFG 0x00400000
136 #define UARTBAUD_BOTHEDGE 0x00020000
137 #define UARTBAUD_RESYNCDIS 0x00010000
138 #define UARTBAUD_LBKDIE 0x00008000
139 #define UARTBAUD_RXEDGIE 0x00004000
140 #define UARTBAUD_SBNS 0x00002000
141 #define UARTBAUD_SBR 0x00000000
142 #define UARTBAUD_SBR_MASK 0x1fff
143
144 #define UARTSTAT_LBKDIF 0x80000000
145 #define UARTSTAT_RXEDGIF 0x40000000
146 #define UARTSTAT_MSBF 0x20000000
147 #define UARTSTAT_RXINV 0x10000000
148 #define UARTSTAT_RWUID 0x08000000
149 #define UARTSTAT_BRK13 0x04000000
150 #define UARTSTAT_LBKDE 0x02000000
151 #define UARTSTAT_RAF 0x01000000
152 #define UARTSTAT_TDRE 0x00800000
153 #define UARTSTAT_TC 0x00400000
154 #define UARTSTAT_RDRF 0x00200000
155 #define UARTSTAT_IDLE 0x00100000
156 #define UARTSTAT_OR 0x00080000
157 #define UARTSTAT_NF 0x00040000
158 #define UARTSTAT_FE 0x00020000
159 #define UARTSTAT_PE 0x00010000
160 #define UARTSTAT_MA1F 0x00008000
161 #define UARTSTAT_M21F 0x00004000
162
163 #define UARTCTRL_R8T9 0x80000000
164 #define UARTCTRL_R9T8 0x40000000
165 #define UARTCTRL_TXDIR 0x20000000
166 #define UARTCTRL_TXINV 0x10000000
167 #define UARTCTRL_ORIE 0x08000000
168 #define UARTCTRL_NEIE 0x04000000
169 #define UARTCTRL_FEIE 0x02000000
170 #define UARTCTRL_PEIE 0x01000000
171 #define UARTCTRL_TIE 0x00800000
172 #define UARTCTRL_TCIE 0x00400000
173 #define UARTCTRL_RIE 0x00200000
174 #define UARTCTRL_ILIE 0x00100000
175 #define UARTCTRL_TE 0x00080000
176 #define UARTCTRL_RE 0x00040000
177 #define UARTCTRL_RWU 0x00020000
178 #define UARTCTRL_SBK 0x00010000
179 #define UARTCTRL_MA1IE 0x00008000
180 #define UARTCTRL_MA2IE 0x00004000
181 #define UARTCTRL_IDLECFG 0x00000100
182 #define UARTCTRL_LOOPS 0x00000080
183 #define UARTCTRL_DOZEEN 0x00000040
184 #define UARTCTRL_RSRC 0x00000020
185 #define UARTCTRL_M 0x00000010
186 #define UARTCTRL_WAKE 0x00000008
187 #define UARTCTRL_ILT 0x00000004
188 #define UARTCTRL_PE 0x00000002
189 #define UARTCTRL_PT 0x00000001
190
191 #define UARTDATA_NOISY 0x00008000
192 #define UARTDATA_PARITYE 0x00004000
193 #define UARTDATA_FRETSC 0x00002000
194 #define UARTDATA_RXEMPT 0x00001000
195 #define UARTDATA_IDLINE 0x00000800
196 #define UARTDATA_MASK 0x3ff
197
198 #define UARTMODIR_IREN 0x00020000
199 #define UARTMODIR_TXCTSSRC 0x00000020
200 #define UARTMODIR_TXCTSC 0x00000010
201 #define UARTMODIR_RXRTSE 0x00000008
202 #define UARTMODIR_TXRTSPOL 0x00000004
203 #define UARTMODIR_TXRTSE 0x00000002
204 #define UARTMODIR_TXCTSE 0x00000001
205
206 #define UARTFIFO_TXEMPT 0x00800000
207 #define UARTFIFO_RXEMPT 0x00400000
208 #define UARTFIFO_TXOF 0x00020000
209 #define UARTFIFO_RXUF 0x00010000
210 #define UARTFIFO_TXFLUSH 0x00008000
211 #define UARTFIFO_RXFLUSH 0x00004000
212 #define UARTFIFO_TXOFE 0x00000200
213 #define UARTFIFO_RXUFE 0x00000100
214 #define UARTFIFO_TXFE 0x00000080
215 #define UARTFIFO_FIFOSIZE_MASK 0x7
216 #define UARTFIFO_TXSIZE_OFF 4
217 #define UARTFIFO_RXFE 0x00000008
218 #define UARTFIFO_RXSIZE_OFF 0
219
220 #define UARTWATER_COUNT_MASK 0xff
221 #define UARTWATER_TXCNT_OFF 8
222 #define UARTWATER_RXCNT_OFF 24
223 #define UARTWATER_WATER_MASK 0xff
224 #define UARTWATER_TXWATER_OFF 0
225 #define UARTWATER_RXWATER_OFF 16
226
227 #define FSL_UART_RX_DMA_BUFFER_SIZE 64
228
229 #define DRIVER_NAME "fsl-lpuart"
230 #define DEV_NAME "ttyLP"
231 #define UART_NR 6
232
233 struct lpuart_port {
234 struct uart_port port;
235 struct clk *clk;
236 unsigned int txfifo_size;
237 unsigned int rxfifo_size;
238 bool lpuart32;
239
240 bool lpuart_dma_tx_use;
241 bool lpuart_dma_rx_use;
242 struct dma_chan *dma_tx_chan;
243 struct dma_chan *dma_rx_chan;
244 struct dma_async_tx_descriptor *dma_tx_desc;
245 struct dma_async_tx_descriptor *dma_rx_desc;
246 dma_addr_t dma_tx_buf_bus;
247 dma_addr_t dma_rx_buf_bus;
248 dma_cookie_t dma_tx_cookie;
249 dma_cookie_t dma_rx_cookie;
250 unsigned char *dma_tx_buf_virt;
251 unsigned char *dma_rx_buf_virt;
252 unsigned int dma_tx_bytes;
253 unsigned int dma_rx_bytes;
254 int dma_tx_in_progress;
255 int dma_rx_in_progress;
256 unsigned int dma_rx_timeout;
257 struct timer_list lpuart_timer;
258 };
259
260 static struct of_device_id lpuart_dt_ids[] = {
261 {
262 .compatible = "fsl,vf610-lpuart",
263 },
264 {
265 .compatible = "fsl,ls1021a-lpuart",
266 },
267 { /* sentinel */ }
268 };
269 MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
270
271 /* Forward declare this for the dma callbacks*/
272 static void lpuart_dma_tx_complete(void *arg);
273 static void lpuart_dma_rx_complete(void *arg);
274
275 static u32 lpuart32_read(void __iomem *addr)
276 {
277 return ioread32be(addr);
278 }
279
280 static void lpuart32_write(u32 val, void __iomem *addr)
281 {
282 iowrite32be(val, addr);
283 }
284
285 static void lpuart_stop_tx(struct uart_port *port)
286 {
287 unsigned char temp;
288
289 temp = readb(port->membase + UARTCR2);
290 temp &= ~(UARTCR2_TIE | UARTCR2_TCIE);
291 writeb(temp, port->membase + UARTCR2);
292 }
293
294 static void lpuart32_stop_tx(struct uart_port *port)
295 {
296 unsigned long temp;
297
298 temp = lpuart32_read(port->membase + UARTCTRL);
299 temp &= ~(UARTCTRL_TIE | UARTCTRL_TCIE);
300 lpuart32_write(temp, port->membase + UARTCTRL);
301 }
302
303 static void lpuart_stop_rx(struct uart_port *port)
304 {
305 unsigned char temp;
306
307 temp = readb(port->membase + UARTCR2);
308 writeb(temp & ~UARTCR2_RE, port->membase + UARTCR2);
309 }
310
311 static void lpuart32_stop_rx(struct uart_port *port)
312 {
313 unsigned long temp;
314
315 temp = lpuart32_read(port->membase + UARTCTRL);
316 lpuart32_write(temp & ~UARTCTRL_RE, port->membase + UARTCTRL);
317 }
318
319 static void lpuart_copy_rx_to_tty(struct lpuart_port *sport,
320 struct tty_port *tty, int count)
321 {
322 int copied;
323
324 sport->port.icount.rx += count;
325
326 if (!tty) {
327 dev_err(sport->port.dev, "No tty port\n");
328 return;
329 }
330
331 dma_sync_single_for_cpu(sport->port.dev, sport->dma_rx_buf_bus,
332 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
333 copied = tty_insert_flip_string(tty,
334 ((unsigned char *)(sport->dma_rx_buf_virt)), count);
335
336 if (copied != count) {
337 WARN_ON(1);
338 dev_err(sport->port.dev, "RxData copy to tty layer failed\n");
339 }
340
341 dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus,
342 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
343 }
344
345 static void lpuart_pio_tx(struct lpuart_port *sport)
346 {
347 struct circ_buf *xmit = &sport->port.state->xmit;
348 unsigned long flags;
349
350 spin_lock_irqsave(&sport->port.lock, flags);
351
352 while (!uart_circ_empty(xmit) &&
353 readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size) {
354 writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
355 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
356 sport->port.icount.tx++;
357 }
358
359 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
360 uart_write_wakeup(&sport->port);
361
362 if (uart_circ_empty(xmit))
363 writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS,
364 sport->port.membase + UARTCR5);
365
366 spin_unlock_irqrestore(&sport->port.lock, flags);
367 }
368
369 static int lpuart_dma_tx(struct lpuart_port *sport, unsigned long count)
370 {
371 struct circ_buf *xmit = &sport->port.state->xmit;
372 dma_addr_t tx_bus_addr;
373
374 dma_sync_single_for_device(sport->port.dev, sport->dma_tx_buf_bus,
375 UART_XMIT_SIZE, DMA_TO_DEVICE);
376 sport->dma_tx_bytes = count & ~(sport->txfifo_size - 1);
377 tx_bus_addr = sport->dma_tx_buf_bus + xmit->tail;
378 sport->dma_tx_desc = dmaengine_prep_slave_single(sport->dma_tx_chan,
379 tx_bus_addr, sport->dma_tx_bytes,
380 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
381
382 if (!sport->dma_tx_desc) {
383 dev_err(sport->port.dev, "Not able to get desc for tx\n");
384 return -EIO;
385 }
386
387 sport->dma_tx_desc->callback = lpuart_dma_tx_complete;
388 sport->dma_tx_desc->callback_param = sport;
389 sport->dma_tx_in_progress = 1;
390 sport->dma_tx_cookie = dmaengine_submit(sport->dma_tx_desc);
391 dma_async_issue_pending(sport->dma_tx_chan);
392
393 return 0;
394 }
395
396 static void lpuart_prepare_tx(struct lpuart_port *sport)
397 {
398 struct circ_buf *xmit = &sport->port.state->xmit;
399 unsigned long count = CIRC_CNT_TO_END(xmit->head,
400 xmit->tail, UART_XMIT_SIZE);
401
402 if (!count)
403 return;
404
405 if (count < sport->txfifo_size)
406 writeb(readb(sport->port.membase + UARTCR5) & ~UARTCR5_TDMAS,
407 sport->port.membase + UARTCR5);
408 else {
409 writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS,
410 sport->port.membase + UARTCR5);
411 lpuart_dma_tx(sport, count);
412 }
413 }
414
415 static void lpuart_dma_tx_complete(void *arg)
416 {
417 struct lpuart_port *sport = arg;
418 struct circ_buf *xmit = &sport->port.state->xmit;
419 unsigned long flags;
420
421 async_tx_ack(sport->dma_tx_desc);
422
423 spin_lock_irqsave(&sport->port.lock, flags);
424
425 xmit->tail = (xmit->tail + sport->dma_tx_bytes) & (UART_XMIT_SIZE - 1);
426 sport->dma_tx_in_progress = 0;
427
428 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
429 uart_write_wakeup(&sport->port);
430
431 lpuart_prepare_tx(sport);
432
433 spin_unlock_irqrestore(&sport->port.lock, flags);
434 }
435
436 static int lpuart_dma_rx(struct lpuart_port *sport)
437 {
438 dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus,
439 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
440 sport->dma_rx_desc = dmaengine_prep_slave_single(sport->dma_rx_chan,
441 sport->dma_rx_buf_bus, FSL_UART_RX_DMA_BUFFER_SIZE,
442 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
443
444 if (!sport->dma_rx_desc) {
445 dev_err(sport->port.dev, "Not able to get desc for rx\n");
446 return -EIO;
447 }
448
449 sport->dma_rx_desc->callback = lpuart_dma_rx_complete;
450 sport->dma_rx_desc->callback_param = sport;
451 sport->dma_rx_in_progress = 1;
452 sport->dma_rx_cookie = dmaengine_submit(sport->dma_rx_desc);
453 dma_async_issue_pending(sport->dma_rx_chan);
454
455 return 0;
456 }
457
458 static void lpuart_flush_buffer(struct uart_port *port)
459 {
460 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
461 if (sport->lpuart_dma_tx_use) {
462 dmaengine_terminate_all(sport->dma_tx_chan);
463 sport->dma_tx_in_progress = 0;
464 }
465 }
466
467 static void lpuart_dma_rx_complete(void *arg)
468 {
469 struct lpuart_port *sport = arg;
470 struct tty_port *port = &sport->port.state->port;
471 unsigned long flags;
472
473 async_tx_ack(sport->dma_rx_desc);
474 mod_timer(&sport->lpuart_timer, jiffies + sport->dma_rx_timeout);
475
476 spin_lock_irqsave(&sport->port.lock, flags);
477
478 sport->dma_rx_in_progress = 0;
479 lpuart_copy_rx_to_tty(sport, port, FSL_UART_RX_DMA_BUFFER_SIZE);
480 tty_flip_buffer_push(port);
481 lpuart_dma_rx(sport);
482
483 spin_unlock_irqrestore(&sport->port.lock, flags);
484 }
485
486 static void lpuart_timer_func(unsigned long data)
487 {
488 struct lpuart_port *sport = (struct lpuart_port *)data;
489 struct tty_port *port = &sport->port.state->port;
490 struct dma_tx_state state;
491 unsigned long flags;
492 unsigned char temp;
493 int count;
494
495 del_timer(&sport->lpuart_timer);
496 dmaengine_pause(sport->dma_rx_chan);
497 dmaengine_tx_status(sport->dma_rx_chan, sport->dma_rx_cookie, &state);
498 dmaengine_terminate_all(sport->dma_rx_chan);
499 count = FSL_UART_RX_DMA_BUFFER_SIZE - state.residue;
500 async_tx_ack(sport->dma_rx_desc);
501
502 spin_lock_irqsave(&sport->port.lock, flags);
503
504 sport->dma_rx_in_progress = 0;
505 lpuart_copy_rx_to_tty(sport, port, count);
506 tty_flip_buffer_push(port);
507 temp = readb(sport->port.membase + UARTCR5);
508 writeb(temp & ~UARTCR5_RDMAS, sport->port.membase + UARTCR5);
509
510 spin_unlock_irqrestore(&sport->port.lock, flags);
511 }
512
513 static inline void lpuart_prepare_rx(struct lpuart_port *sport)
514 {
515 unsigned long flags;
516 unsigned char temp;
517
518 spin_lock_irqsave(&sport->port.lock, flags);
519
520 sport->lpuart_timer.expires = jiffies + sport->dma_rx_timeout;
521 add_timer(&sport->lpuart_timer);
522
523 lpuart_dma_rx(sport);
524 temp = readb(sport->port.membase + UARTCR5);
525 writeb(temp | UARTCR5_RDMAS, sport->port.membase + UARTCR5);
526
527 spin_unlock_irqrestore(&sport->port.lock, flags);
528 }
529
530 static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
531 {
532 struct circ_buf *xmit = &sport->port.state->xmit;
533
534 while (!uart_circ_empty(xmit) &&
535 (readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size)) {
536 writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
537 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
538 sport->port.icount.tx++;
539 }
540
541 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
542 uart_write_wakeup(&sport->port);
543
544 if (uart_circ_empty(xmit))
545 lpuart_stop_tx(&sport->port);
546 }
547
548 static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
549 {
550 struct circ_buf *xmit = &sport->port.state->xmit;
551 unsigned long txcnt;
552
553 txcnt = lpuart32_read(sport->port.membase + UARTWATER);
554 txcnt = txcnt >> UARTWATER_TXCNT_OFF;
555 txcnt &= UARTWATER_COUNT_MASK;
556 while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) {
557 lpuart32_write(xmit->buf[xmit->tail], sport->port.membase + UARTDATA);
558 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
559 sport->port.icount.tx++;
560 txcnt = lpuart32_read(sport->port.membase + UARTWATER);
561 txcnt = txcnt >> UARTWATER_TXCNT_OFF;
562 txcnt &= UARTWATER_COUNT_MASK;
563 }
564
565 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
566 uart_write_wakeup(&sport->port);
567
568 if (uart_circ_empty(xmit))
569 lpuart32_stop_tx(&sport->port);
570 }
571
572 static void lpuart_start_tx(struct uart_port *port)
573 {
574 struct lpuart_port *sport = container_of(port,
575 struct lpuart_port, port);
576 struct circ_buf *xmit = &sport->port.state->xmit;
577 unsigned char temp;
578
579 temp = readb(port->membase + UARTCR2);
580 writeb(temp | UARTCR2_TIE, port->membase + UARTCR2);
581
582 if (sport->lpuart_dma_tx_use) {
583 if (!uart_circ_empty(xmit) && !sport->dma_tx_in_progress)
584 lpuart_prepare_tx(sport);
585 } else {
586 if (readb(port->membase + UARTSR1) & UARTSR1_TDRE)
587 lpuart_transmit_buffer(sport);
588 }
589 }
590
591 static void lpuart32_start_tx(struct uart_port *port)
592 {
593 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
594 unsigned long temp;
595
596 temp = lpuart32_read(port->membase + UARTCTRL);
597 lpuart32_write(temp | UARTCTRL_TIE, port->membase + UARTCTRL);
598
599 if (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE)
600 lpuart32_transmit_buffer(sport);
601 }
602
603 static irqreturn_t lpuart_txint(int irq, void *dev_id)
604 {
605 struct lpuart_port *sport = dev_id;
606 struct circ_buf *xmit = &sport->port.state->xmit;
607 unsigned long flags;
608
609 spin_lock_irqsave(&sport->port.lock, flags);
610 if (sport->port.x_char) {
611 if (sport->lpuart32)
612 lpuart32_write(sport->port.x_char, sport->port.membase + UARTDATA);
613 else
614 writeb(sport->port.x_char, sport->port.membase + UARTDR);
615 goto out;
616 }
617
618 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
619 if (sport->lpuart32)
620 lpuart32_stop_tx(&sport->port);
621 else
622 lpuart_stop_tx(&sport->port);
623 goto out;
624 }
625
626 if (sport->lpuart32)
627 lpuart32_transmit_buffer(sport);
628 else
629 lpuart_transmit_buffer(sport);
630
631 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
632 uart_write_wakeup(&sport->port);
633
634 out:
635 spin_unlock_irqrestore(&sport->port.lock, flags);
636 return IRQ_HANDLED;
637 }
638
639 static irqreturn_t lpuart_rxint(int irq, void *dev_id)
640 {
641 struct lpuart_port *sport = dev_id;
642 unsigned int flg, ignored = 0;
643 struct tty_port *port = &sport->port.state->port;
644 unsigned long flags;
645 unsigned char rx, sr;
646
647 spin_lock_irqsave(&sport->port.lock, flags);
648
649 while (!(readb(sport->port.membase + UARTSFIFO) & UARTSFIFO_RXEMPT)) {
650 flg = TTY_NORMAL;
651 sport->port.icount.rx++;
652 /*
653 * to clear the FE, OR, NF, FE, PE flags,
654 * read SR1 then read DR
655 */
656 sr = readb(sport->port.membase + UARTSR1);
657 rx = readb(sport->port.membase + UARTDR);
658
659 if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
660 continue;
661
662 if (sr & (UARTSR1_PE | UARTSR1_OR | UARTSR1_FE)) {
663 if (sr & UARTSR1_PE)
664 sport->port.icount.parity++;
665 else if (sr & UARTSR1_FE)
666 sport->port.icount.frame++;
667
668 if (sr & UARTSR1_OR)
669 sport->port.icount.overrun++;
670
671 if (sr & sport->port.ignore_status_mask) {
672 if (++ignored > 100)
673 goto out;
674 continue;
675 }
676
677 sr &= sport->port.read_status_mask;
678
679 if (sr & UARTSR1_PE)
680 flg = TTY_PARITY;
681 else if (sr & UARTSR1_FE)
682 flg = TTY_FRAME;
683
684 if (sr & UARTSR1_OR)
685 flg = TTY_OVERRUN;
686
687 #ifdef SUPPORT_SYSRQ
688 sport->port.sysrq = 0;
689 #endif
690 }
691
692 tty_insert_flip_char(port, rx, flg);
693 }
694
695 out:
696 spin_unlock_irqrestore(&sport->port.lock, flags);
697
698 tty_flip_buffer_push(port);
699 return IRQ_HANDLED;
700 }
701
702 static irqreturn_t lpuart32_rxint(int irq, void *dev_id)
703 {
704 struct lpuart_port *sport = dev_id;
705 unsigned int flg, ignored = 0;
706 struct tty_port *port = &sport->port.state->port;
707 unsigned long flags;
708 unsigned long rx, sr;
709
710 spin_lock_irqsave(&sport->port.lock, flags);
711
712 while (!(lpuart32_read(sport->port.membase + UARTFIFO) & UARTFIFO_RXEMPT)) {
713 flg = TTY_NORMAL;
714 sport->port.icount.rx++;
715 /*
716 * to clear the FE, OR, NF, FE, PE flags,
717 * read STAT then read DATA reg
718 */
719 sr = lpuart32_read(sport->port.membase + UARTSTAT);
720 rx = lpuart32_read(sport->port.membase + UARTDATA);
721 rx &= 0x3ff;
722
723 if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
724 continue;
725
726 if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
727 if (sr & UARTSTAT_PE)
728 sport->port.icount.parity++;
729 else if (sr & UARTSTAT_FE)
730 sport->port.icount.frame++;
731
732 if (sr & UARTSTAT_OR)
733 sport->port.icount.overrun++;
734
735 if (sr & sport->port.ignore_status_mask) {
736 if (++ignored > 100)
737 goto out;
738 continue;
739 }
740
741 sr &= sport->port.read_status_mask;
742
743 if (sr & UARTSTAT_PE)
744 flg = TTY_PARITY;
745 else if (sr & UARTSTAT_FE)
746 flg = TTY_FRAME;
747
748 if (sr & UARTSTAT_OR)
749 flg = TTY_OVERRUN;
750
751 #ifdef SUPPORT_SYSRQ
752 sport->port.sysrq = 0;
753 #endif
754 }
755
756 tty_insert_flip_char(port, rx, flg);
757 }
758
759 out:
760 spin_unlock_irqrestore(&sport->port.lock, flags);
761
762 tty_flip_buffer_push(port);
763 return IRQ_HANDLED;
764 }
765
766 static irqreturn_t lpuart_int(int irq, void *dev_id)
767 {
768 struct lpuart_port *sport = dev_id;
769 unsigned char sts, crdma;
770
771 sts = readb(sport->port.membase + UARTSR1);
772 crdma = readb(sport->port.membase + UARTCR5);
773
774 if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) {
775 if (sport->lpuart_dma_rx_use)
776 lpuart_prepare_rx(sport);
777 else
778 lpuart_rxint(irq, dev_id);
779 }
780 if (sts & UARTSR1_TDRE && !(crdma & UARTCR5_TDMAS)) {
781 if (sport->lpuart_dma_tx_use)
782 lpuart_pio_tx(sport);
783 else
784 lpuart_txint(irq, dev_id);
785 }
786
787 return IRQ_HANDLED;
788 }
789
790 static irqreturn_t lpuart32_int(int irq, void *dev_id)
791 {
792 struct lpuart_port *sport = dev_id;
793 unsigned long sts, rxcount;
794
795 sts = lpuart32_read(sport->port.membase + UARTSTAT);
796 rxcount = lpuart32_read(sport->port.membase + UARTWATER);
797 rxcount = rxcount >> UARTWATER_RXCNT_OFF;
798
799 if (sts & UARTSTAT_RDRF || rxcount > 0)
800 lpuart32_rxint(irq, dev_id);
801
802 if ((sts & UARTSTAT_TDRE) &&
803 !(lpuart32_read(sport->port.membase + UARTBAUD) & UARTBAUD_TDMAE))
804 lpuart_txint(irq, dev_id);
805
806 lpuart32_write(sts, sport->port.membase + UARTSTAT);
807 return IRQ_HANDLED;
808 }
809
810 /* return TIOCSER_TEMT when transmitter is not busy */
811 static unsigned int lpuart_tx_empty(struct uart_port *port)
812 {
813 return (readb(port->membase + UARTSR1) & UARTSR1_TC) ?
814 TIOCSER_TEMT : 0;
815 }
816
817 static unsigned int lpuart32_tx_empty(struct uart_port *port)
818 {
819 return (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TC) ?
820 TIOCSER_TEMT : 0;
821 }
822
823 static unsigned int lpuart_get_mctrl(struct uart_port *port)
824 {
825 unsigned int temp = 0;
826 unsigned char reg;
827
828 reg = readb(port->membase + UARTMODEM);
829 if (reg & UARTMODEM_TXCTSE)
830 temp |= TIOCM_CTS;
831
832 if (reg & UARTMODEM_RXRTSE)
833 temp |= TIOCM_RTS;
834
835 return temp;
836 }
837
838 static unsigned int lpuart32_get_mctrl(struct uart_port *port)
839 {
840 unsigned int temp = 0;
841 unsigned long reg;
842
843 reg = lpuart32_read(port->membase + UARTMODIR);
844 if (reg & UARTMODIR_TXCTSE)
845 temp |= TIOCM_CTS;
846
847 if (reg & UARTMODIR_RXRTSE)
848 temp |= TIOCM_RTS;
849
850 return temp;
851 }
852
853 static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
854 {
855 unsigned char temp;
856
857 temp = readb(port->membase + UARTMODEM) &
858 ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
859
860 if (mctrl & TIOCM_RTS)
861 temp |= UARTMODEM_RXRTSE;
862
863 if (mctrl & TIOCM_CTS)
864 temp |= UARTMODEM_TXCTSE;
865
866 writeb(temp, port->membase + UARTMODEM);
867 }
868
869 static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
870 {
871 unsigned long temp;
872
873 temp = lpuart32_read(port->membase + UARTMODIR) &
874 ~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
875
876 if (mctrl & TIOCM_RTS)
877 temp |= UARTMODIR_RXRTSE;
878
879 if (mctrl & TIOCM_CTS)
880 temp |= UARTMODIR_TXCTSE;
881
882 lpuart32_write(temp, port->membase + UARTMODIR);
883 }
884
885 static void lpuart_break_ctl(struct uart_port *port, int break_state)
886 {
887 unsigned char temp;
888
889 temp = readb(port->membase + UARTCR2) & ~UARTCR2_SBK;
890
891 if (break_state != 0)
892 temp |= UARTCR2_SBK;
893
894 writeb(temp, port->membase + UARTCR2);
895 }
896
897 static void lpuart32_break_ctl(struct uart_port *port, int break_state)
898 {
899 unsigned long temp;
900
901 temp = lpuart32_read(port->membase + UARTCTRL) & ~UARTCTRL_SBK;
902
903 if (break_state != 0)
904 temp |= UARTCTRL_SBK;
905
906 lpuart32_write(temp, port->membase + UARTCTRL);
907 }
908
909 static void lpuart_setup_watermark(struct lpuart_port *sport)
910 {
911 unsigned char val, cr2;
912 unsigned char cr2_saved;
913
914 cr2 = readb(sport->port.membase + UARTCR2);
915 cr2_saved = cr2;
916 cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_TE |
917 UARTCR2_RIE | UARTCR2_RE);
918 writeb(cr2, sport->port.membase + UARTCR2);
919
920 val = readb(sport->port.membase + UARTPFIFO);
921 writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE,
922 sport->port.membase + UARTPFIFO);
923
924 /* explicitly clear RDRF */
925 readb(sport->port.membase + UARTSR1);
926
927 /* flush Tx and Rx FIFO */
928 writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
929 sport->port.membase + UARTCFIFO);
930
931 writeb(0, sport->port.membase + UARTTWFIFO);
932 writeb(1, sport->port.membase + UARTRWFIFO);
933
934 /* Restore cr2 */
935 writeb(cr2_saved, sport->port.membase + UARTCR2);
936 }
937
938 static void lpuart32_setup_watermark(struct lpuart_port *sport)
939 {
940 unsigned long val, ctrl;
941 unsigned long ctrl_saved;
942
943 ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
944 ctrl_saved = ctrl;
945 ctrl &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_TE |
946 UARTCTRL_RIE | UARTCTRL_RE);
947 lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
948
949 /* enable FIFO mode */
950 val = lpuart32_read(sport->port.membase + UARTFIFO);
951 val |= UARTFIFO_TXFE | UARTFIFO_RXFE;
952 val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH;
953 lpuart32_write(val, sport->port.membase + UARTFIFO);
954
955 /* set the watermark */
956 val = (0x1 << UARTWATER_RXWATER_OFF) | (0x0 << UARTWATER_TXWATER_OFF);
957 lpuart32_write(val, sport->port.membase + UARTWATER);
958
959 /* Restore cr2 */
960 lpuart32_write(ctrl_saved, sport->port.membase + UARTCTRL);
961 }
962
963 static int lpuart_dma_tx_request(struct uart_port *port)
964 {
965 struct lpuart_port *sport = container_of(port,
966 struct lpuart_port, port);
967 struct dma_slave_config dma_tx_sconfig;
968 dma_addr_t dma_bus;
969 unsigned char *dma_buf;
970 int ret;
971
972 dma_bus = dma_map_single(sport->dma_tx_chan->device->dev,
973 sport->port.state->xmit.buf,
974 UART_XMIT_SIZE, DMA_TO_DEVICE);
975
976 if (dma_mapping_error(sport->dma_tx_chan->device->dev, dma_bus)) {
977 dev_err(sport->port.dev, "dma_map_single tx failed\n");
978 return -ENOMEM;
979 }
980
981 dma_buf = sport->port.state->xmit.buf;
982 dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDR;
983 dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
984 dma_tx_sconfig.dst_maxburst = sport->txfifo_size;
985 dma_tx_sconfig.direction = DMA_MEM_TO_DEV;
986 ret = dmaengine_slave_config(sport->dma_tx_chan, &dma_tx_sconfig);
987
988 if (ret < 0) {
989 dev_err(sport->port.dev,
990 "Dma slave config failed, err = %d\n", ret);
991 return ret;
992 }
993
994 sport->dma_tx_buf_virt = dma_buf;
995 sport->dma_tx_buf_bus = dma_bus;
996 sport->dma_tx_in_progress = 0;
997
998 return 0;
999 }
1000
1001 static int lpuart_dma_rx_request(struct uart_port *port)
1002 {
1003 struct lpuart_port *sport = container_of(port,
1004 struct lpuart_port, port);
1005 struct dma_slave_config dma_rx_sconfig;
1006 dma_addr_t dma_bus;
1007 unsigned char *dma_buf;
1008 int ret;
1009
1010 dma_buf = devm_kzalloc(sport->port.dev,
1011 FSL_UART_RX_DMA_BUFFER_SIZE, GFP_KERNEL);
1012
1013 if (!dma_buf) {
1014 dev_err(sport->port.dev, "Dma rx alloc failed\n");
1015 return -ENOMEM;
1016 }
1017
1018 dma_bus = dma_map_single(sport->dma_rx_chan->device->dev, dma_buf,
1019 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
1020
1021 if (dma_mapping_error(sport->dma_rx_chan->device->dev, dma_bus)) {
1022 dev_err(sport->port.dev, "dma_map_single rx failed\n");
1023 return -ENOMEM;
1024 }
1025
1026 dma_rx_sconfig.src_addr = sport->port.mapbase + UARTDR;
1027 dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1028 dma_rx_sconfig.src_maxburst = 1;
1029 dma_rx_sconfig.direction = DMA_DEV_TO_MEM;
1030 ret = dmaengine_slave_config(sport->dma_rx_chan, &dma_rx_sconfig);
1031
1032 if (ret < 0) {
1033 dev_err(sport->port.dev,
1034 "Dma slave config failed, err = %d\n", ret);
1035 return ret;
1036 }
1037
1038 sport->dma_rx_buf_virt = dma_buf;
1039 sport->dma_rx_buf_bus = dma_bus;
1040 sport->dma_rx_in_progress = 0;
1041
1042 return 0;
1043 }
1044
1045 static void lpuart_dma_tx_free(struct uart_port *port)
1046 {
1047 struct lpuart_port *sport = container_of(port,
1048 struct lpuart_port, port);
1049
1050 dma_unmap_single(sport->port.dev, sport->dma_tx_buf_bus,
1051 UART_XMIT_SIZE, DMA_TO_DEVICE);
1052
1053 sport->dma_tx_buf_bus = 0;
1054 sport->dma_tx_buf_virt = NULL;
1055 }
1056
1057 static void lpuart_dma_rx_free(struct uart_port *port)
1058 {
1059 struct lpuart_port *sport = container_of(port,
1060 struct lpuart_port, port);
1061
1062 dma_unmap_single(sport->port.dev, sport->dma_rx_buf_bus,
1063 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
1064
1065 sport->dma_rx_buf_bus = 0;
1066 sport->dma_rx_buf_virt = NULL;
1067 }
1068
1069 static int lpuart_startup(struct uart_port *port)
1070 {
1071 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1072 int ret;
1073 unsigned long flags;
1074 unsigned char temp;
1075
1076 /* determine FIFO size and enable FIFO mode */
1077 temp = readb(sport->port.membase + UARTPFIFO);
1078
1079 sport->txfifo_size = 0x1 << (((temp >> UARTPFIFO_TXSIZE_OFF) &
1080 UARTPFIFO_FIFOSIZE_MASK) + 1);
1081
1082 sport->port.fifosize = sport->txfifo_size;
1083
1084 sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &
1085 UARTPFIFO_FIFOSIZE_MASK) + 1);
1086
1087 if (sport->dma_rx_chan && !lpuart_dma_rx_request(port)) {
1088 sport->lpuart_dma_rx_use = true;
1089 setup_timer(&sport->lpuart_timer, lpuart_timer_func,
1090 (unsigned long)sport);
1091 } else
1092 sport->lpuart_dma_rx_use = false;
1093
1094
1095 if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
1096 sport->lpuart_dma_tx_use = true;
1097 temp = readb(port->membase + UARTCR5);
1098 temp &= ~UARTCR5_RDMAS;
1099 writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
1100 } else
1101 sport->lpuart_dma_tx_use = false;
1102
1103 ret = devm_request_irq(port->dev, port->irq, lpuart_int, 0,
1104 DRIVER_NAME, sport);
1105 if (ret)
1106 return ret;
1107
1108 spin_lock_irqsave(&sport->port.lock, flags);
1109
1110 lpuart_setup_watermark(sport);
1111
1112 temp = readb(sport->port.membase + UARTCR2);
1113 temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE);
1114 writeb(temp, sport->port.membase + UARTCR2);
1115
1116 spin_unlock_irqrestore(&sport->port.lock, flags);
1117 return 0;
1118 }
1119
1120 static int lpuart32_startup(struct uart_port *port)
1121 {
1122 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1123 int ret;
1124 unsigned long flags;
1125 unsigned long temp;
1126
1127 /* determine FIFO size */
1128 temp = lpuart32_read(sport->port.membase + UARTFIFO);
1129
1130 sport->txfifo_size = 0x1 << (((temp >> UARTFIFO_TXSIZE_OFF) &
1131 UARTFIFO_FIFOSIZE_MASK) - 1);
1132
1133 sport->rxfifo_size = 0x1 << (((temp >> UARTFIFO_RXSIZE_OFF) &
1134 UARTFIFO_FIFOSIZE_MASK) - 1);
1135
1136 ret = devm_request_irq(port->dev, port->irq, lpuart32_int, 0,
1137 DRIVER_NAME, sport);
1138 if (ret)
1139 return ret;
1140
1141 spin_lock_irqsave(&sport->port.lock, flags);
1142
1143 lpuart32_setup_watermark(sport);
1144
1145 temp = lpuart32_read(sport->port.membase + UARTCTRL);
1146 temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE | UARTCTRL_TE);
1147 temp |= UARTCTRL_ILIE;
1148 lpuart32_write(temp, sport->port.membase + UARTCTRL);
1149
1150 spin_unlock_irqrestore(&sport->port.lock, flags);
1151 return 0;
1152 }
1153
1154 static void lpuart_shutdown(struct uart_port *port)
1155 {
1156 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1157 unsigned char temp;
1158 unsigned long flags;
1159
1160 spin_lock_irqsave(&port->lock, flags);
1161
1162 /* disable Rx/Tx and interrupts */
1163 temp = readb(port->membase + UARTCR2);
1164 temp &= ~(UARTCR2_TE | UARTCR2_RE |
1165 UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
1166 writeb(temp, port->membase + UARTCR2);
1167
1168 spin_unlock_irqrestore(&port->lock, flags);
1169
1170 devm_free_irq(port->dev, port->irq, sport);
1171
1172 if (sport->lpuart_dma_rx_use) {
1173 lpuart_dma_rx_free(&sport->port);
1174 del_timer_sync(&sport->lpuart_timer);
1175 }
1176
1177 if (sport->lpuart_dma_tx_use)
1178 lpuart_dma_tx_free(&sport->port);
1179 }
1180
1181 static void lpuart32_shutdown(struct uart_port *port)
1182 {
1183 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1184 unsigned long temp;
1185 unsigned long flags;
1186
1187 spin_lock_irqsave(&port->lock, flags);
1188
1189 /* disable Rx/Tx and interrupts */
1190 temp = lpuart32_read(port->membase + UARTCTRL);
1191 temp &= ~(UARTCTRL_TE | UARTCTRL_RE |
1192 UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
1193 lpuart32_write(temp, port->membase + UARTCTRL);
1194
1195 spin_unlock_irqrestore(&port->lock, flags);
1196
1197 devm_free_irq(port->dev, port->irq, sport);
1198 }
1199
1200 static void
1201 lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
1202 struct ktermios *old)
1203 {
1204 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1205 unsigned long flags;
1206 unsigned char cr1, old_cr1, old_cr2, cr4, bdh, modem;
1207 unsigned int baud;
1208 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
1209 unsigned int sbr, brfa;
1210
1211 cr1 = old_cr1 = readb(sport->port.membase + UARTCR1);
1212 old_cr2 = readb(sport->port.membase + UARTCR2);
1213 cr4 = readb(sport->port.membase + UARTCR4);
1214 bdh = readb(sport->port.membase + UARTBDH);
1215 modem = readb(sport->port.membase + UARTMODEM);
1216 /*
1217 * only support CS8 and CS7, and for CS7 must enable PE.
1218 * supported mode:
1219 * - (7,e/o,1)
1220 * - (8,n,1)
1221 * - (8,m/s,1)
1222 * - (8,e/o,1)
1223 */
1224 while ((termios->c_cflag & CSIZE) != CS8 &&
1225 (termios->c_cflag & CSIZE) != CS7) {
1226 termios->c_cflag &= ~CSIZE;
1227 termios->c_cflag |= old_csize;
1228 old_csize = CS8;
1229 }
1230
1231 if ((termios->c_cflag & CSIZE) == CS8 ||
1232 (termios->c_cflag & CSIZE) == CS7)
1233 cr1 = old_cr1 & ~UARTCR1_M;
1234
1235 if (termios->c_cflag & CMSPAR) {
1236 if ((termios->c_cflag & CSIZE) != CS8) {
1237 termios->c_cflag &= ~CSIZE;
1238 termios->c_cflag |= CS8;
1239 }
1240 cr1 |= UARTCR1_M;
1241 }
1242
1243 if (termios->c_cflag & CRTSCTS) {
1244 modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1245 } else {
1246 termios->c_cflag &= ~CRTSCTS;
1247 modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1248 }
1249
1250 if (termios->c_cflag & CSTOPB)
1251 termios->c_cflag &= ~CSTOPB;
1252
1253 /* parity must be enabled when CS7 to match 8-bits format */
1254 if ((termios->c_cflag & CSIZE) == CS7)
1255 termios->c_cflag |= PARENB;
1256
1257 if ((termios->c_cflag & PARENB)) {
1258 if (termios->c_cflag & CMSPAR) {
1259 cr1 &= ~UARTCR1_PE;
1260 cr1 |= UARTCR1_M;
1261 } else {
1262 cr1 |= UARTCR1_PE;
1263 if ((termios->c_cflag & CSIZE) == CS8)
1264 cr1 |= UARTCR1_M;
1265 if (termios->c_cflag & PARODD)
1266 cr1 |= UARTCR1_PT;
1267 else
1268 cr1 &= ~UARTCR1_PT;
1269 }
1270 }
1271
1272 /* ask the core to calculate the divisor */
1273 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
1274
1275 spin_lock_irqsave(&sport->port.lock, flags);
1276
1277 sport->port.read_status_mask = 0;
1278 if (termios->c_iflag & INPCK)
1279 sport->port.read_status_mask |= (UARTSR1_FE | UARTSR1_PE);
1280 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1281 sport->port.read_status_mask |= UARTSR1_FE;
1282
1283 /* characters to ignore */
1284 sport->port.ignore_status_mask = 0;
1285 if (termios->c_iflag & IGNPAR)
1286 sport->port.ignore_status_mask |= UARTSR1_PE;
1287 if (termios->c_iflag & IGNBRK) {
1288 sport->port.ignore_status_mask |= UARTSR1_FE;
1289 /*
1290 * if we're ignoring parity and break indicators,
1291 * ignore overruns too (for real raw support).
1292 */
1293 if (termios->c_iflag & IGNPAR)
1294 sport->port.ignore_status_mask |= UARTSR1_OR;
1295 }
1296
1297 /* update the per-port timeout */
1298 uart_update_timeout(port, termios->c_cflag, baud);
1299
1300 if (sport->lpuart_dma_rx_use) {
1301 /* Calculate delay for 1.5 DMA buffers */
1302 sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
1303 FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
1304 sport->rxfifo_size / 2;
1305 dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
1306 sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout);
1307 if (sport->dma_rx_timeout < msecs_to_jiffies(20))
1308 sport->dma_rx_timeout = msecs_to_jiffies(20);
1309 }
1310
1311 /* wait transmit engin complete */
1312 while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
1313 barrier();
1314
1315 /* disable transmit and receive */
1316 writeb(old_cr2 & ~(UARTCR2_TE | UARTCR2_RE),
1317 sport->port.membase + UARTCR2);
1318
1319 sbr = sport->port.uartclk / (16 * baud);
1320 brfa = ((sport->port.uartclk - (16 * sbr * baud)) * 2) / baud;
1321 bdh &= ~UARTBDH_SBR_MASK;
1322 bdh |= (sbr >> 8) & 0x1F;
1323 cr4 &= ~UARTCR4_BRFA_MASK;
1324 brfa &= UARTCR4_BRFA_MASK;
1325 writeb(cr4 | brfa, sport->port.membase + UARTCR4);
1326 writeb(bdh, sport->port.membase + UARTBDH);
1327 writeb(sbr & 0xFF, sport->port.membase + UARTBDL);
1328 writeb(cr1, sport->port.membase + UARTCR1);
1329 writeb(modem, sport->port.membase + UARTMODEM);
1330
1331 /* restore control register */
1332 writeb(old_cr2, sport->port.membase + UARTCR2);
1333
1334 spin_unlock_irqrestore(&sport->port.lock, flags);
1335 }
1336
1337 static void
1338 lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
1339 struct ktermios *old)
1340 {
1341 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1342 unsigned long flags;
1343 unsigned long ctrl, old_ctrl, bd, modem;
1344 unsigned int baud;
1345 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
1346 unsigned int sbr;
1347
1348 ctrl = old_ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
1349 bd = lpuart32_read(sport->port.membase + UARTBAUD);
1350 modem = lpuart32_read(sport->port.membase + UARTMODIR);
1351 /*
1352 * only support CS8 and CS7, and for CS7 must enable PE.
1353 * supported mode:
1354 * - (7,e/o,1)
1355 * - (8,n,1)
1356 * - (8,m/s,1)
1357 * - (8,e/o,1)
1358 */
1359 while ((termios->c_cflag & CSIZE) != CS8 &&
1360 (termios->c_cflag & CSIZE) != CS7) {
1361 termios->c_cflag &= ~CSIZE;
1362 termios->c_cflag |= old_csize;
1363 old_csize = CS8;
1364 }
1365
1366 if ((termios->c_cflag & CSIZE) == CS8 ||
1367 (termios->c_cflag & CSIZE) == CS7)
1368 ctrl = old_ctrl & ~UARTCTRL_M;
1369
1370 if (termios->c_cflag & CMSPAR) {
1371 if ((termios->c_cflag & CSIZE) != CS8) {
1372 termios->c_cflag &= ~CSIZE;
1373 termios->c_cflag |= CS8;
1374 }
1375 ctrl |= UARTCTRL_M;
1376 }
1377
1378 if (termios->c_cflag & CRTSCTS) {
1379 modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1380 } else {
1381 termios->c_cflag &= ~CRTSCTS;
1382 modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1383 }
1384
1385 if (termios->c_cflag & CSTOPB)
1386 termios->c_cflag &= ~CSTOPB;
1387
1388 /* parity must be enabled when CS7 to match 8-bits format */
1389 if ((termios->c_cflag & CSIZE) == CS7)
1390 termios->c_cflag |= PARENB;
1391
1392 if ((termios->c_cflag & PARENB)) {
1393 if (termios->c_cflag & CMSPAR) {
1394 ctrl &= ~UARTCTRL_PE;
1395 ctrl |= UARTCTRL_M;
1396 } else {
1397 ctrl |= UARTCR1_PE;
1398 if ((termios->c_cflag & CSIZE) == CS8)
1399 ctrl |= UARTCTRL_M;
1400 if (termios->c_cflag & PARODD)
1401 ctrl |= UARTCTRL_PT;
1402 else
1403 ctrl &= ~UARTCTRL_PT;
1404 }
1405 }
1406
1407 /* ask the core to calculate the divisor */
1408 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
1409
1410 spin_lock_irqsave(&sport->port.lock, flags);
1411
1412 sport->port.read_status_mask = 0;
1413 if (termios->c_iflag & INPCK)
1414 sport->port.read_status_mask |= (UARTSTAT_FE | UARTSTAT_PE);
1415 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1416 sport->port.read_status_mask |= UARTSTAT_FE;
1417
1418 /* characters to ignore */
1419 sport->port.ignore_status_mask = 0;
1420 if (termios->c_iflag & IGNPAR)
1421 sport->port.ignore_status_mask |= UARTSTAT_PE;
1422 if (termios->c_iflag & IGNBRK) {
1423 sport->port.ignore_status_mask |= UARTSTAT_FE;
1424 /*
1425 * if we're ignoring parity and break indicators,
1426 * ignore overruns too (for real raw support).
1427 */
1428 if (termios->c_iflag & IGNPAR)
1429 sport->port.ignore_status_mask |= UARTSTAT_OR;
1430 }
1431
1432 /* update the per-port timeout */
1433 uart_update_timeout(port, termios->c_cflag, baud);
1434
1435 /* wait transmit engin complete */
1436 while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
1437 barrier();
1438
1439 /* disable transmit and receive */
1440 lpuart32_write(old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
1441 sport->port.membase + UARTCTRL);
1442
1443 sbr = sport->port.uartclk / (16 * baud);
1444 bd &= ~UARTBAUD_SBR_MASK;
1445 bd |= sbr & UARTBAUD_SBR_MASK;
1446 bd |= UARTBAUD_BOTHEDGE;
1447 bd &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);
1448 lpuart32_write(bd, sport->port.membase + UARTBAUD);
1449 lpuart32_write(modem, sport->port.membase + UARTMODIR);
1450 lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
1451 /* restore control register */
1452
1453 spin_unlock_irqrestore(&sport->port.lock, flags);
1454 }
1455
1456 static const char *lpuart_type(struct uart_port *port)
1457 {
1458 return "FSL_LPUART";
1459 }
1460
1461 static void lpuart_release_port(struct uart_port *port)
1462 {
1463 /* nothing to do */
1464 }
1465
1466 static int lpuart_request_port(struct uart_port *port)
1467 {
1468 return 0;
1469 }
1470
1471 /* configure/autoconfigure the port */
1472 static void lpuart_config_port(struct uart_port *port, int flags)
1473 {
1474 if (flags & UART_CONFIG_TYPE)
1475 port->type = PORT_LPUART;
1476 }
1477
1478 static int lpuart_verify_port(struct uart_port *port, struct serial_struct *ser)
1479 {
1480 int ret = 0;
1481
1482 if (ser->type != PORT_UNKNOWN && ser->type != PORT_LPUART)
1483 ret = -EINVAL;
1484 if (port->irq != ser->irq)
1485 ret = -EINVAL;
1486 if (ser->io_type != UPIO_MEM)
1487 ret = -EINVAL;
1488 if (port->uartclk / 16 != ser->baud_base)
1489 ret = -EINVAL;
1490 if (port->iobase != ser->port)
1491 ret = -EINVAL;
1492 if (ser->hub6 != 0)
1493 ret = -EINVAL;
1494 return ret;
1495 }
1496
1497 static struct uart_ops lpuart_pops = {
1498 .tx_empty = lpuart_tx_empty,
1499 .set_mctrl = lpuart_set_mctrl,
1500 .get_mctrl = lpuart_get_mctrl,
1501 .stop_tx = lpuart_stop_tx,
1502 .start_tx = lpuart_start_tx,
1503 .stop_rx = lpuart_stop_rx,
1504 .break_ctl = lpuart_break_ctl,
1505 .startup = lpuart_startup,
1506 .shutdown = lpuart_shutdown,
1507 .set_termios = lpuart_set_termios,
1508 .type = lpuart_type,
1509 .request_port = lpuart_request_port,
1510 .release_port = lpuart_release_port,
1511 .config_port = lpuart_config_port,
1512 .verify_port = lpuart_verify_port,
1513 .flush_buffer = lpuart_flush_buffer,
1514 };
1515
1516 static struct uart_ops lpuart32_pops = {
1517 .tx_empty = lpuart32_tx_empty,
1518 .set_mctrl = lpuart32_set_mctrl,
1519 .get_mctrl = lpuart32_get_mctrl,
1520 .stop_tx = lpuart32_stop_tx,
1521 .start_tx = lpuart32_start_tx,
1522 .stop_rx = lpuart32_stop_rx,
1523 .break_ctl = lpuart32_break_ctl,
1524 .startup = lpuart32_startup,
1525 .shutdown = lpuart32_shutdown,
1526 .set_termios = lpuart32_set_termios,
1527 .type = lpuart_type,
1528 .request_port = lpuart_request_port,
1529 .release_port = lpuart_release_port,
1530 .config_port = lpuart_config_port,
1531 .verify_port = lpuart_verify_port,
1532 .flush_buffer = lpuart_flush_buffer,
1533 };
1534
1535 static struct lpuart_port *lpuart_ports[UART_NR];
1536
1537 #ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
1538 static void lpuart_console_putchar(struct uart_port *port, int ch)
1539 {
1540 while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
1541 barrier();
1542
1543 writeb(ch, port->membase + UARTDR);
1544 }
1545
1546 static void lpuart32_console_putchar(struct uart_port *port, int ch)
1547 {
1548 while (!(lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE))
1549 barrier();
1550
1551 lpuart32_write(ch, port->membase + UARTDATA);
1552 }
1553
1554 static void
1555 lpuart_console_write(struct console *co, const char *s, unsigned int count)
1556 {
1557 struct lpuart_port *sport = lpuart_ports[co->index];
1558 unsigned char old_cr2, cr2;
1559
1560 /* first save CR2 and then disable interrupts */
1561 cr2 = old_cr2 = readb(sport->port.membase + UARTCR2);
1562 cr2 |= (UARTCR2_TE | UARTCR2_RE);
1563 cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
1564 writeb(cr2, sport->port.membase + UARTCR2);
1565
1566 uart_console_write(&sport->port, s, count, lpuart_console_putchar);
1567
1568 /* wait for transmitter finish complete and restore CR2 */
1569 while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
1570 barrier();
1571
1572 writeb(old_cr2, sport->port.membase + UARTCR2);
1573 }
1574
1575 static void
1576 lpuart32_console_write(struct console *co, const char *s, unsigned int count)
1577 {
1578 struct lpuart_port *sport = lpuart_ports[co->index];
1579 unsigned long old_cr, cr;
1580
1581 /* first save CR2 and then disable interrupts */
1582 cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL);
1583 cr |= (UARTCTRL_TE | UARTCTRL_RE);
1584 cr &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
1585 lpuart32_write(cr, sport->port.membase + UARTCTRL);
1586
1587 uart_console_write(&sport->port, s, count, lpuart32_console_putchar);
1588
1589 /* wait for transmitter finish complete and restore CR2 */
1590 while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
1591 barrier();
1592
1593 lpuart32_write(old_cr, sport->port.membase + UARTCTRL);
1594 }
1595
1596 /*
1597 * if the port was already initialised (eg, by a boot loader),
1598 * try to determine the current setup.
1599 */
1600 static void __init
1601 lpuart_console_get_options(struct lpuart_port *sport, int *baud,
1602 int *parity, int *bits)
1603 {
1604 unsigned char cr, bdh, bdl, brfa;
1605 unsigned int sbr, uartclk, baud_raw;
1606
1607 cr = readb(sport->port.membase + UARTCR2);
1608 cr &= UARTCR2_TE | UARTCR2_RE;
1609 if (!cr)
1610 return;
1611
1612 /* ok, the port was enabled */
1613
1614 cr = readb(sport->port.membase + UARTCR1);
1615
1616 *parity = 'n';
1617 if (cr & UARTCR1_PE) {
1618 if (cr & UARTCR1_PT)
1619 *parity = 'o';
1620 else
1621 *parity = 'e';
1622 }
1623
1624 if (cr & UARTCR1_M)
1625 *bits = 9;
1626 else
1627 *bits = 8;
1628
1629 bdh = readb(sport->port.membase + UARTBDH);
1630 bdh &= UARTBDH_SBR_MASK;
1631 bdl = readb(sport->port.membase + UARTBDL);
1632 sbr = bdh;
1633 sbr <<= 8;
1634 sbr |= bdl;
1635 brfa = readb(sport->port.membase + UARTCR4);
1636 brfa &= UARTCR4_BRFA_MASK;
1637
1638 uartclk = clk_get_rate(sport->clk);
1639 /*
1640 * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
1641 */
1642 baud_raw = uartclk / (16 * (sbr + brfa / 32));
1643
1644 if (*baud != baud_raw)
1645 printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
1646 "from %d to %d\n", baud_raw, *baud);
1647 }
1648
1649 static void __init
1650 lpuart32_console_get_options(struct lpuart_port *sport, int *baud,
1651 int *parity, int *bits)
1652 {
1653 unsigned long cr, bd;
1654 unsigned int sbr, uartclk, baud_raw;
1655
1656 cr = lpuart32_read(sport->port.membase + UARTCTRL);
1657 cr &= UARTCTRL_TE | UARTCTRL_RE;
1658 if (!cr)
1659 return;
1660
1661 /* ok, the port was enabled */
1662
1663 cr = lpuart32_read(sport->port.membase + UARTCTRL);
1664
1665 *parity = 'n';
1666 if (cr & UARTCTRL_PE) {
1667 if (cr & UARTCTRL_PT)
1668 *parity = 'o';
1669 else
1670 *parity = 'e';
1671 }
1672
1673 if (cr & UARTCTRL_M)
1674 *bits = 9;
1675 else
1676 *bits = 8;
1677
1678 bd = lpuart32_read(sport->port.membase + UARTBAUD);
1679 bd &= UARTBAUD_SBR_MASK;
1680 sbr = bd;
1681 uartclk = clk_get_rate(sport->clk);
1682 /*
1683 * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
1684 */
1685 baud_raw = uartclk / (16 * sbr);
1686
1687 if (*baud != baud_raw)
1688 printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
1689 "from %d to %d\n", baud_raw, *baud);
1690 }
1691
1692 static int __init lpuart_console_setup(struct console *co, char *options)
1693 {
1694 struct lpuart_port *sport;
1695 int baud = 115200;
1696 int bits = 8;
1697 int parity = 'n';
1698 int flow = 'n';
1699
1700 /*
1701 * check whether an invalid uart number has been specified, and
1702 * if so, search for the first available port that does have
1703 * console support.
1704 */
1705 if (co->index == -1 || co->index >= ARRAY_SIZE(lpuart_ports))
1706 co->index = 0;
1707
1708 sport = lpuart_ports[co->index];
1709 if (sport == NULL)
1710 return -ENODEV;
1711
1712 if (options)
1713 uart_parse_options(options, &baud, &parity, &bits, &flow);
1714 else
1715 if (sport->lpuart32)
1716 lpuart32_console_get_options(sport, &baud, &parity, &bits);
1717 else
1718 lpuart_console_get_options(sport, &baud, &parity, &bits);
1719
1720 if (sport->lpuart32)
1721 lpuart32_setup_watermark(sport);
1722 else
1723 lpuart_setup_watermark(sport);
1724
1725 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
1726 }
1727
1728 static struct uart_driver lpuart_reg;
1729 static struct console lpuart_console = {
1730 .name = DEV_NAME,
1731 .write = lpuart_console_write,
1732 .device = uart_console_device,
1733 .setup = lpuart_console_setup,
1734 .flags = CON_PRINTBUFFER,
1735 .index = -1,
1736 .data = &lpuart_reg,
1737 };
1738
1739 static struct console lpuart32_console = {
1740 .name = DEV_NAME,
1741 .write = lpuart32_console_write,
1742 .device = uart_console_device,
1743 .setup = lpuart_console_setup,
1744 .flags = CON_PRINTBUFFER,
1745 .index = -1,
1746 .data = &lpuart_reg,
1747 };
1748
1749 #define LPUART_CONSOLE (&lpuart_console)
1750 #define LPUART32_CONSOLE (&lpuart32_console)
1751 #else
1752 #define LPUART_CONSOLE NULL
1753 #define LPUART32_CONSOLE NULL
1754 #endif
1755
1756 static struct uart_driver lpuart_reg = {
1757 .owner = THIS_MODULE,
1758 .driver_name = DRIVER_NAME,
1759 .dev_name = DEV_NAME,
1760 .nr = ARRAY_SIZE(lpuart_ports),
1761 .cons = LPUART_CONSOLE,
1762 };
1763
1764 static int lpuart_probe(struct platform_device *pdev)
1765 {
1766 struct device_node *np = pdev->dev.of_node;
1767 struct lpuart_port *sport;
1768 struct resource *res;
1769 int ret;
1770
1771 sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
1772 if (!sport)
1773 return -ENOMEM;
1774
1775 pdev->dev.coherent_dma_mask = 0;
1776
1777 ret = of_alias_get_id(np, "serial");
1778 if (ret < 0) {
1779 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
1780 return ret;
1781 }
1782 sport->port.line = ret;
1783 sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
1784
1785 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1786 sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
1787 if (IS_ERR(sport->port.membase))
1788 return PTR_ERR(sport->port.membase);
1789
1790 sport->port.mapbase = res->start;
1791 sport->port.dev = &pdev->dev;
1792 sport->port.type = PORT_LPUART;
1793 sport->port.iotype = UPIO_MEM;
1794 sport->port.irq = platform_get_irq(pdev, 0);
1795 if (sport->lpuart32)
1796 sport->port.ops = &lpuart32_pops;
1797 else
1798 sport->port.ops = &lpuart_pops;
1799 sport->port.flags = UPF_BOOT_AUTOCONF;
1800
1801 sport->clk = devm_clk_get(&pdev->dev, "ipg");
1802 if (IS_ERR(sport->clk)) {
1803 ret = PTR_ERR(sport->clk);
1804 dev_err(&pdev->dev, "failed to get uart clk: %d\n", ret);
1805 return ret;
1806 }
1807
1808 ret = clk_prepare_enable(sport->clk);
1809 if (ret) {
1810 dev_err(&pdev->dev, "failed to enable uart clk: %d\n", ret);
1811 return ret;
1812 }
1813
1814 sport->port.uartclk = clk_get_rate(sport->clk);
1815
1816 lpuart_ports[sport->port.line] = sport;
1817
1818 platform_set_drvdata(pdev, &sport->port);
1819
1820 if (sport->lpuart32)
1821 lpuart_reg.cons = LPUART32_CONSOLE;
1822 else
1823 lpuart_reg.cons = LPUART_CONSOLE;
1824
1825 ret = uart_add_one_port(&lpuart_reg, &sport->port);
1826 if (ret) {
1827 clk_disable_unprepare(sport->clk);
1828 return ret;
1829 }
1830
1831 sport->dma_tx_chan = dma_request_slave_channel(sport->port.dev, "tx");
1832 if (!sport->dma_tx_chan)
1833 dev_info(sport->port.dev, "DMA tx channel request failed, "
1834 "operating without tx DMA\n");
1835
1836 sport->dma_rx_chan = dma_request_slave_channel(sport->port.dev, "rx");
1837 if (!sport->dma_rx_chan)
1838 dev_info(sport->port.dev, "DMA rx channel request failed, "
1839 "operating without rx DMA\n");
1840
1841 return 0;
1842 }
1843
1844 static int lpuart_remove(struct platform_device *pdev)
1845 {
1846 struct lpuart_port *sport = platform_get_drvdata(pdev);
1847
1848 uart_remove_one_port(&lpuart_reg, &sport->port);
1849
1850 clk_disable_unprepare(sport->clk);
1851
1852 if (sport->dma_tx_chan)
1853 dma_release_channel(sport->dma_tx_chan);
1854
1855 if (sport->dma_rx_chan)
1856 dma_release_channel(sport->dma_rx_chan);
1857
1858 return 0;
1859 }
1860
1861 #ifdef CONFIG_PM_SLEEP
1862 static int lpuart_suspend(struct device *dev)
1863 {
1864 struct lpuart_port *sport = dev_get_drvdata(dev);
1865 unsigned long temp;
1866
1867 if (sport->lpuart32) {
1868 /* disable Rx/Tx and interrupts */
1869 temp = lpuart32_read(sport->port.membase + UARTCTRL);
1870 temp &= ~(UARTCTRL_TE | UARTCTRL_TIE | UARTCTRL_TCIE);
1871 lpuart32_write(temp, sport->port.membase + UARTCTRL);
1872 } else {
1873 /* disable Rx/Tx and interrupts */
1874 temp = readb(sport->port.membase + UARTCR2);
1875 temp &= ~(UARTCR2_TE | UARTCR2_TIE | UARTCR2_TCIE);
1876 writeb(temp, sport->port.membase + UARTCR2);
1877 }
1878
1879 uart_suspend_port(&lpuart_reg, &sport->port);
1880
1881 return 0;
1882 }
1883
1884 static int lpuart_resume(struct device *dev)
1885 {
1886 struct lpuart_port *sport = dev_get_drvdata(dev);
1887 unsigned long temp;
1888
1889 if (sport->lpuart32) {
1890 lpuart32_setup_watermark(sport);
1891 temp = lpuart32_read(sport->port.membase + UARTCTRL);
1892 temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE |
1893 UARTCTRL_TE | UARTCTRL_ILIE);
1894 lpuart32_write(temp, sport->port.membase + UARTCTRL);
1895 } else {
1896 lpuart_setup_watermark(sport);
1897 temp = readb(sport->port.membase + UARTCR2);
1898 temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE);
1899 writeb(temp, sport->port.membase + UARTCR2);
1900 }
1901
1902 uart_resume_port(&lpuart_reg, &sport->port);
1903
1904 return 0;
1905 }
1906 #endif
1907
1908 static SIMPLE_DEV_PM_OPS(lpuart_pm_ops, lpuart_suspend, lpuart_resume);
1909
1910 static struct platform_driver lpuart_driver = {
1911 .probe = lpuart_probe,
1912 .remove = lpuart_remove,
1913 .driver = {
1914 .name = "fsl-lpuart",
1915 .of_match_table = lpuart_dt_ids,
1916 .pm = &lpuart_pm_ops,
1917 },
1918 };
1919
1920 static int __init lpuart_serial_init(void)
1921 {
1922 int ret = uart_register_driver(&lpuart_reg);
1923
1924 if (ret)
1925 return ret;
1926
1927 ret = platform_driver_register(&lpuart_driver);
1928 if (ret)
1929 uart_unregister_driver(&lpuart_reg);
1930
1931 return ret;
1932 }
1933
1934 static void __exit lpuart_serial_exit(void)
1935 {
1936 platform_driver_unregister(&lpuart_driver);
1937 uart_unregister_driver(&lpuart_reg);
1938 }
1939
1940 module_init(lpuart_serial_init);
1941 module_exit(lpuart_serial_exit);
1942
1943 MODULE_DESCRIPTION("Freescale lpuart serial port driver");
1944 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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