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IB/srp: Add multichannel support
[linux/fpc-iii.git] / drivers / tty / serial / fsl_lpuart.c
blob6dd53af546a301bac38c8289e2f0b6487621d2e5
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_use;
241 struct dma_chan *dma_tx_chan;
242 struct dma_chan *dma_rx_chan;
243 struct dma_async_tx_descriptor *dma_tx_desc;
244 struct dma_async_tx_descriptor *dma_rx_desc;
245 dma_addr_t dma_tx_buf_bus;
246 dma_addr_t dma_rx_buf_bus;
247 dma_cookie_t dma_tx_cookie;
248 dma_cookie_t dma_rx_cookie;
249 unsigned char *dma_tx_buf_virt;
250 unsigned char *dma_rx_buf_virt;
251 unsigned int dma_tx_bytes;
252 unsigned int dma_rx_bytes;
253 int dma_tx_in_progress;
254 int dma_rx_in_progress;
255 unsigned int dma_rx_timeout;
256 struct timer_list lpuart_timer;
257 };
258
259 static struct of_device_id lpuart_dt_ids[] = {
260 {
261 .compatible = "fsl,vf610-lpuart",
262 },
263 {
264 .compatible = "fsl,ls1021a-lpuart",
265 },
266 { /* sentinel */ }
267 };
268 MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
269
270 /* Forward declare this for the dma callbacks*/
271 static void lpuart_dma_tx_complete(void *arg);
272 static void lpuart_dma_rx_complete(void *arg);
273
274 static u32 lpuart32_read(void __iomem *addr)
275 {
276 return ioread32be(addr);
277 }
278
279 static void lpuart32_write(u32 val, void __iomem *addr)
280 {
281 iowrite32be(val, addr);
282 }
283
284 static void lpuart_stop_tx(struct uart_port *port)
285 {
286 unsigned char temp;
287
288 temp = readb(port->membase + UARTCR2);
289 temp &= ~(UARTCR2_TIE | UARTCR2_TCIE);
290 writeb(temp, port->membase + UARTCR2);
291 }
292
293 static void lpuart32_stop_tx(struct uart_port *port)
294 {
295 unsigned long temp;
296
297 temp = lpuart32_read(port->membase + UARTCTRL);
298 temp &= ~(UARTCTRL_TIE | UARTCTRL_TCIE);
299 lpuart32_write(temp, port->membase + UARTCTRL);
300 }
301
302 static void lpuart_stop_rx(struct uart_port *port)
303 {
304 unsigned char temp;
305
306 temp = readb(port->membase + UARTCR2);
307 writeb(temp & ~UARTCR2_RE, port->membase + UARTCR2);
308 }
309
310 static void lpuart32_stop_rx(struct uart_port *port)
311 {
312 unsigned long temp;
313
314 temp = lpuart32_read(port->membase + UARTCTRL);
315 lpuart32_write(temp & ~UARTCTRL_RE, port->membase + UARTCTRL);
316 }
317
318 static void lpuart_copy_rx_to_tty(struct lpuart_port *sport,
319 struct tty_port *tty, int count)
320 {
321 int copied;
322
323 sport->port.icount.rx += count;
324
325 if (!tty) {
326 dev_err(sport->port.dev, "No tty port\n");
327 return;
328 }
329
330 dma_sync_single_for_cpu(sport->port.dev, sport->dma_rx_buf_bus,
331 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
332 copied = tty_insert_flip_string(tty,
333 ((unsigned char *)(sport->dma_rx_buf_virt)), count);
334
335 if (copied != count) {
336 WARN_ON(1);
337 dev_err(sport->port.dev, "RxData copy to tty layer failed\n");
338 }
339
340 dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus,
341 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
342 }
343
344 static void lpuart_pio_tx(struct lpuart_port *sport)
345 {
346 struct circ_buf *xmit = &sport->port.state->xmit;
347 unsigned long flags;
348
349 spin_lock_irqsave(&sport->port.lock, flags);
350
351 while (!uart_circ_empty(xmit) &&
352 readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size) {
353 writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
354 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
355 sport->port.icount.tx++;
356 }
357
358 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
359 uart_write_wakeup(&sport->port);
360
361 if (uart_circ_empty(xmit))
362 writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS,
363 sport->port.membase + UARTCR5);
364
365 spin_unlock_irqrestore(&sport->port.lock, flags);
366 }
367
368 static int lpuart_dma_tx(struct lpuart_port *sport, unsigned long count)
369 {
370 struct circ_buf *xmit = &sport->port.state->xmit;
371 dma_addr_t tx_bus_addr;
372
373 dma_sync_single_for_device(sport->port.dev, sport->dma_tx_buf_bus,
374 UART_XMIT_SIZE, DMA_TO_DEVICE);
375 sport->dma_tx_bytes = count & ~(sport->txfifo_size - 1);
376 tx_bus_addr = sport->dma_tx_buf_bus + xmit->tail;
377 sport->dma_tx_desc = dmaengine_prep_slave_single(sport->dma_tx_chan,
378 tx_bus_addr, sport->dma_tx_bytes,
379 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
380
381 if (!sport->dma_tx_desc) {
382 dev_err(sport->port.dev, "Not able to get desc for tx\n");
383 return -EIO;
384 }
385
386 sport->dma_tx_desc->callback = lpuart_dma_tx_complete;
387 sport->dma_tx_desc->callback_param = sport;
388 sport->dma_tx_in_progress = 1;
389 sport->dma_tx_cookie = dmaengine_submit(sport->dma_tx_desc);
390 dma_async_issue_pending(sport->dma_tx_chan);
391
392 return 0;
393 }
394
395 static void lpuart_prepare_tx(struct lpuart_port *sport)
396 {
397 struct circ_buf *xmit = &sport->port.state->xmit;
398 unsigned long count = CIRC_CNT_TO_END(xmit->head,
399 xmit->tail, UART_XMIT_SIZE);
400
401 if (!count)
402 return;
403
404 if (count < sport->txfifo_size)
405 writeb(readb(sport->port.membase + UARTCR5) & ~UARTCR5_TDMAS,
406 sport->port.membase + UARTCR5);
407 else {
408 writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS,
409 sport->port.membase + UARTCR5);
410 lpuart_dma_tx(sport, count);
411 }
412 }
413
414 static void lpuart_dma_tx_complete(void *arg)
415 {
416 struct lpuart_port *sport = arg;
417 struct circ_buf *xmit = &sport->port.state->xmit;
418 unsigned long flags;
419
420 async_tx_ack(sport->dma_tx_desc);
421
422 spin_lock_irqsave(&sport->port.lock, flags);
423
424 xmit->tail = (xmit->tail + sport->dma_tx_bytes) & (UART_XMIT_SIZE - 1);
425 sport->dma_tx_in_progress = 0;
426
427 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
428 uart_write_wakeup(&sport->port);
429
430 lpuart_prepare_tx(sport);
431
432 spin_unlock_irqrestore(&sport->port.lock, flags);
433 }
434
435 static int lpuart_dma_rx(struct lpuart_port *sport)
436 {
437 dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus,
438 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
439 sport->dma_rx_desc = dmaengine_prep_slave_single(sport->dma_rx_chan,
440 sport->dma_rx_buf_bus, FSL_UART_RX_DMA_BUFFER_SIZE,
441 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
442
443 if (!sport->dma_rx_desc) {
444 dev_err(sport->port.dev, "Not able to get desc for rx\n");
445 return -EIO;
446 }
447
448 sport->dma_rx_desc->callback = lpuart_dma_rx_complete;
449 sport->dma_rx_desc->callback_param = sport;
450 sport->dma_rx_in_progress = 1;
451 sport->dma_rx_cookie = dmaengine_submit(sport->dma_rx_desc);
452 dma_async_issue_pending(sport->dma_rx_chan);
453
454 return 0;
455 }
456
457 static void lpuart_dma_rx_complete(void *arg)
458 {
459 struct lpuart_port *sport = arg;
460 struct tty_port *port = &sport->port.state->port;
461 unsigned long flags;
462
463 async_tx_ack(sport->dma_rx_desc);
464
465 spin_lock_irqsave(&sport->port.lock, flags);
466
467 sport->dma_rx_in_progress = 0;
468 lpuart_copy_rx_to_tty(sport, port, FSL_UART_RX_DMA_BUFFER_SIZE);
469 tty_flip_buffer_push(port);
470 lpuart_dma_rx(sport);
471
472 spin_unlock_irqrestore(&sport->port.lock, flags);
473 }
474
475 static void lpuart_timer_func(unsigned long data)
476 {
477 struct lpuart_port *sport = (struct lpuart_port *)data;
478 struct tty_port *port = &sport->port.state->port;
479 struct dma_tx_state state;
480 unsigned long flags;
481 unsigned char temp;
482 int count;
483
484 del_timer(&sport->lpuart_timer);
485 dmaengine_pause(sport->dma_rx_chan);
486 dmaengine_tx_status(sport->dma_rx_chan, sport->dma_rx_cookie, &state);
487 dmaengine_terminate_all(sport->dma_rx_chan);
488 count = FSL_UART_RX_DMA_BUFFER_SIZE - state.residue;
489 async_tx_ack(sport->dma_rx_desc);
490
491 spin_lock_irqsave(&sport->port.lock, flags);
492
493 sport->dma_rx_in_progress = 0;
494 lpuart_copy_rx_to_tty(sport, port, count);
495 tty_flip_buffer_push(port);
496 temp = readb(sport->port.membase + UARTCR5);
497 writeb(temp & ~UARTCR5_RDMAS, sport->port.membase + UARTCR5);
498
499 spin_unlock_irqrestore(&sport->port.lock, flags);
500 }
501
502 static inline void lpuart_prepare_rx(struct lpuart_port *sport)
503 {
504 unsigned long flags;
505 unsigned char temp;
506
507 spin_lock_irqsave(&sport->port.lock, flags);
508
509 init_timer(&sport->lpuart_timer);
510 sport->lpuart_timer.function = lpuart_timer_func;
511 sport->lpuart_timer.data = (unsigned long)sport;
512 sport->lpuart_timer.expires = jiffies + sport->dma_rx_timeout;
513 add_timer(&sport->lpuart_timer);
514
515 lpuart_dma_rx(sport);
516 temp = readb(sport->port.membase + UARTCR5);
517 writeb(temp | UARTCR5_RDMAS, sport->port.membase + UARTCR5);
518
519 spin_unlock_irqrestore(&sport->port.lock, flags);
520 }
521
522 static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
523 {
524 struct circ_buf *xmit = &sport->port.state->xmit;
525
526 while (!uart_circ_empty(xmit) &&
527 (readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size)) {
528 writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
529 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
530 sport->port.icount.tx++;
531 }
532
533 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
534 uart_write_wakeup(&sport->port);
535
536 if (uart_circ_empty(xmit))
537 lpuart_stop_tx(&sport->port);
538 }
539
540 static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
541 {
542 struct circ_buf *xmit = &sport->port.state->xmit;
543 unsigned long txcnt;
544
545 txcnt = lpuart32_read(sport->port.membase + UARTWATER);
546 txcnt = txcnt >> UARTWATER_TXCNT_OFF;
547 txcnt &= UARTWATER_COUNT_MASK;
548 while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) {
549 lpuart32_write(xmit->buf[xmit->tail], sport->port.membase + UARTDATA);
550 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
551 sport->port.icount.tx++;
552 txcnt = lpuart32_read(sport->port.membase + UARTWATER);
553 txcnt = txcnt >> UARTWATER_TXCNT_OFF;
554 txcnt &= UARTWATER_COUNT_MASK;
555 }
556
557 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
558 uart_write_wakeup(&sport->port);
559
560 if (uart_circ_empty(xmit))
561 lpuart32_stop_tx(&sport->port);
562 }
563
564 static void lpuart_start_tx(struct uart_port *port)
565 {
566 struct lpuart_port *sport = container_of(port,
567 struct lpuart_port, port);
568 struct circ_buf *xmit = &sport->port.state->xmit;
569 unsigned char temp;
570
571 temp = readb(port->membase + UARTCR2);
572 writeb(temp | UARTCR2_TIE, port->membase + UARTCR2);
573
574 if (sport->lpuart_dma_use) {
575 if (!uart_circ_empty(xmit) && !sport->dma_tx_in_progress)
576 lpuart_prepare_tx(sport);
577 } else {
578 if (readb(port->membase + UARTSR1) & UARTSR1_TDRE)
579 lpuart_transmit_buffer(sport);
580 }
581 }
582
583 static void lpuart32_start_tx(struct uart_port *port)
584 {
585 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
586 unsigned long temp;
587
588 temp = lpuart32_read(port->membase + UARTCTRL);
589 lpuart32_write(temp | UARTCTRL_TIE, port->membase + UARTCTRL);
590
591 if (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE)
592 lpuart32_transmit_buffer(sport);
593 }
594
595 static irqreturn_t lpuart_txint(int irq, void *dev_id)
596 {
597 struct lpuart_port *sport = dev_id;
598 struct circ_buf *xmit = &sport->port.state->xmit;
599 unsigned long flags;
600
601 spin_lock_irqsave(&sport->port.lock, flags);
602 if (sport->port.x_char) {
603 if (sport->lpuart32)
604 lpuart32_write(sport->port.x_char, sport->port.membase + UARTDATA);
605 else
606 writeb(sport->port.x_char, sport->port.membase + UARTDR);
607 goto out;
608 }
609
610 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
611 if (sport->lpuart32)
612 lpuart32_stop_tx(&sport->port);
613 else
614 lpuart_stop_tx(&sport->port);
615 goto out;
616 }
617
618 if (sport->lpuart32)
619 lpuart32_transmit_buffer(sport);
620 else
621 lpuart_transmit_buffer(sport);
622
623 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
624 uart_write_wakeup(&sport->port);
625
626 out:
627 spin_unlock_irqrestore(&sport->port.lock, flags);
628 return IRQ_HANDLED;
629 }
630
631 static irqreturn_t lpuart_rxint(int irq, void *dev_id)
632 {
633 struct lpuart_port *sport = dev_id;
634 unsigned int flg, ignored = 0;
635 struct tty_port *port = &sport->port.state->port;
636 unsigned long flags;
637 unsigned char rx, sr;
638
639 spin_lock_irqsave(&sport->port.lock, flags);
640
641 while (!(readb(sport->port.membase + UARTSFIFO) & UARTSFIFO_RXEMPT)) {
642 flg = TTY_NORMAL;
643 sport->port.icount.rx++;
644 /*
645 * to clear the FE, OR, NF, FE, PE flags,
646 * read SR1 then read DR
647 */
648 sr = readb(sport->port.membase + UARTSR1);
649 rx = readb(sport->port.membase + UARTDR);
650
651 if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
652 continue;
653
654 if (sr & (UARTSR1_PE | UARTSR1_OR | UARTSR1_FE)) {
655 if (sr & UARTSR1_PE)
656 sport->port.icount.parity++;
657 else if (sr & UARTSR1_FE)
658 sport->port.icount.frame++;
659
660 if (sr & UARTSR1_OR)
661 sport->port.icount.overrun++;
662
663 if (sr & sport->port.ignore_status_mask) {
664 if (++ignored > 100)
665 goto out;
666 continue;
667 }
668
669 sr &= sport->port.read_status_mask;
670
671 if (sr & UARTSR1_PE)
672 flg = TTY_PARITY;
673 else if (sr & UARTSR1_FE)
674 flg = TTY_FRAME;
675
676 if (sr & UARTSR1_OR)
677 flg = TTY_OVERRUN;
678
679 #ifdef SUPPORT_SYSRQ
680 sport->port.sysrq = 0;
681 #endif
682 }
683
684 tty_insert_flip_char(port, rx, flg);
685 }
686
687 out:
688 spin_unlock_irqrestore(&sport->port.lock, flags);
689
690 tty_flip_buffer_push(port);
691 return IRQ_HANDLED;
692 }
693
694 static irqreturn_t lpuart32_rxint(int irq, void *dev_id)
695 {
696 struct lpuart_port *sport = dev_id;
697 unsigned int flg, ignored = 0;
698 struct tty_port *port = &sport->port.state->port;
699 unsigned long flags;
700 unsigned long rx, sr;
701
702 spin_lock_irqsave(&sport->port.lock, flags);
703
704 while (!(lpuart32_read(sport->port.membase + UARTFIFO) & UARTFIFO_RXEMPT)) {
705 flg = TTY_NORMAL;
706 sport->port.icount.rx++;
707 /*
708 * to clear the FE, OR, NF, FE, PE flags,
709 * read STAT then read DATA reg
710 */
711 sr = lpuart32_read(sport->port.membase + UARTSTAT);
712 rx = lpuart32_read(sport->port.membase + UARTDATA);
713 rx &= 0x3ff;
714
715 if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
716 continue;
717
718 if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
719 if (sr & UARTSTAT_PE)
720 sport->port.icount.parity++;
721 else if (sr & UARTSTAT_FE)
722 sport->port.icount.frame++;
723
724 if (sr & UARTSTAT_OR)
725 sport->port.icount.overrun++;
726
727 if (sr & sport->port.ignore_status_mask) {
728 if (++ignored > 100)
729 goto out;
730 continue;
731 }
732
733 sr &= sport->port.read_status_mask;
734
735 if (sr & UARTSTAT_PE)
736 flg = TTY_PARITY;
737 else if (sr & UARTSTAT_FE)
738 flg = TTY_FRAME;
739
740 if (sr & UARTSTAT_OR)
741 flg = TTY_OVERRUN;
742
743 #ifdef SUPPORT_SYSRQ
744 sport->port.sysrq = 0;
745 #endif
746 }
747
748 tty_insert_flip_char(port, rx, flg);
749 }
750
751 out:
752 spin_unlock_irqrestore(&sport->port.lock, flags);
753
754 tty_flip_buffer_push(port);
755 return IRQ_HANDLED;
756 }
757
758 static irqreturn_t lpuart_int(int irq, void *dev_id)
759 {
760 struct lpuart_port *sport = dev_id;
761 unsigned char sts;
762
763 sts = readb(sport->port.membase + UARTSR1);
764
765 if (sts & UARTSR1_RDRF) {
766 if (sport->lpuart_dma_use)
767 lpuart_prepare_rx(sport);
768 else
769 lpuart_rxint(irq, dev_id);
770 }
771 if (sts & UARTSR1_TDRE &&
772 !(readb(sport->port.membase + UARTCR5) & UARTCR5_TDMAS)) {
773 if (sport->lpuart_dma_use)
774 lpuart_pio_tx(sport);
775 else
776 lpuart_txint(irq, dev_id);
777 }
778
779 return IRQ_HANDLED;
780 }
781
782 static irqreturn_t lpuart32_int(int irq, void *dev_id)
783 {
784 struct lpuart_port *sport = dev_id;
785 unsigned long sts, rxcount;
786
787 sts = lpuart32_read(sport->port.membase + UARTSTAT);
788 rxcount = lpuart32_read(sport->port.membase + UARTWATER);
789 rxcount = rxcount >> UARTWATER_RXCNT_OFF;
790
791 if (sts & UARTSTAT_RDRF || rxcount > 0)
792 lpuart32_rxint(irq, dev_id);
793
794 if ((sts & UARTSTAT_TDRE) &&
795 !(lpuart32_read(sport->port.membase + UARTBAUD) & UARTBAUD_TDMAE))
796 lpuart_txint(irq, dev_id);
797
798 lpuart32_write(sts, sport->port.membase + UARTSTAT);
799 return IRQ_HANDLED;
800 }
801
802 /* return TIOCSER_TEMT when transmitter is not busy */
803 static unsigned int lpuart_tx_empty(struct uart_port *port)
804 {
805 return (readb(port->membase + UARTSR1) & UARTSR1_TC) ?
806 TIOCSER_TEMT : 0;
807 }
808
809 static unsigned int lpuart32_tx_empty(struct uart_port *port)
810 {
811 return (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TC) ?
812 TIOCSER_TEMT : 0;
813 }
814
815 static unsigned int lpuart_get_mctrl(struct uart_port *port)
816 {
817 unsigned int temp = 0;
818 unsigned char reg;
819
820 reg = readb(port->membase + UARTMODEM);
821 if (reg & UARTMODEM_TXCTSE)
822 temp |= TIOCM_CTS;
823
824 if (reg & UARTMODEM_RXRTSE)
825 temp |= TIOCM_RTS;
826
827 return temp;
828 }
829
830 static unsigned int lpuart32_get_mctrl(struct uart_port *port)
831 {
832 unsigned int temp = 0;
833 unsigned long reg;
834
835 reg = lpuart32_read(port->membase + UARTMODIR);
836 if (reg & UARTMODIR_TXCTSE)
837 temp |= TIOCM_CTS;
838
839 if (reg & UARTMODIR_RXRTSE)
840 temp |= TIOCM_RTS;
841
842 return temp;
843 }
844
845 static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
846 {
847 unsigned char temp;
848
849 temp = readb(port->membase + UARTMODEM) &
850 ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
851
852 if (mctrl & TIOCM_RTS)
853 temp |= UARTMODEM_RXRTSE;
854
855 if (mctrl & TIOCM_CTS)
856 temp |= UARTMODEM_TXCTSE;
857
858 writeb(temp, port->membase + UARTMODEM);
859 }
860
861 static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
862 {
863 unsigned long temp;
864
865 temp = lpuart32_read(port->membase + UARTMODIR) &
866 ~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
867
868 if (mctrl & TIOCM_RTS)
869 temp |= UARTMODIR_RXRTSE;
870
871 if (mctrl & TIOCM_CTS)
872 temp |= UARTMODIR_TXCTSE;
873
874 lpuart32_write(temp, port->membase + UARTMODIR);
875 }
876
877 static void lpuart_break_ctl(struct uart_port *port, int break_state)
878 {
879 unsigned char temp;
880
881 temp = readb(port->membase + UARTCR2) & ~UARTCR2_SBK;
882
883 if (break_state != 0)
884 temp |= UARTCR2_SBK;
885
886 writeb(temp, port->membase + UARTCR2);
887 }
888
889 static void lpuart32_break_ctl(struct uart_port *port, int break_state)
890 {
891 unsigned long temp;
892
893 temp = lpuart32_read(port->membase + UARTCTRL) & ~UARTCTRL_SBK;
894
895 if (break_state != 0)
896 temp |= UARTCTRL_SBK;
897
898 lpuart32_write(temp, port->membase + UARTCTRL);
899 }
900
901 static void lpuart_setup_watermark(struct lpuart_port *sport)
902 {
903 unsigned char val, cr2;
904 unsigned char cr2_saved;
905
906 cr2 = readb(sport->port.membase + UARTCR2);
907 cr2_saved = cr2;
908 cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_TE |
909 UARTCR2_RIE | UARTCR2_RE);
910 writeb(cr2, sport->port.membase + UARTCR2);
911
912 val = readb(sport->port.membase + UARTPFIFO);
913 writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE,
914 sport->port.membase + UARTPFIFO);
915
916 /* flush Tx and Rx FIFO */
917 writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
918 sport->port.membase + UARTCFIFO);
919
920 writeb(0, sport->port.membase + UARTTWFIFO);
921 writeb(1, sport->port.membase + UARTRWFIFO);
922
923 /* Restore cr2 */
924 writeb(cr2_saved, sport->port.membase + UARTCR2);
925 }
926
927 static void lpuart32_setup_watermark(struct lpuart_port *sport)
928 {
929 unsigned long val, ctrl;
930 unsigned long ctrl_saved;
931
932 ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
933 ctrl_saved = ctrl;
934 ctrl &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_TE |
935 UARTCTRL_RIE | UARTCTRL_RE);
936 lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
937
938 /* enable FIFO mode */
939 val = lpuart32_read(sport->port.membase + UARTFIFO);
940 val |= UARTFIFO_TXFE | UARTFIFO_RXFE;
941 val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH;
942 lpuart32_write(val, sport->port.membase + UARTFIFO);
943
944 /* set the watermark */
945 val = (0x1 << UARTWATER_RXWATER_OFF) | (0x0 << UARTWATER_TXWATER_OFF);
946 lpuart32_write(val, sport->port.membase + UARTWATER);
947
948 /* Restore cr2 */
949 lpuart32_write(ctrl_saved, sport->port.membase + UARTCTRL);
950 }
951
952 static int lpuart_dma_tx_request(struct uart_port *port)
953 {
954 struct lpuart_port *sport = container_of(port,
955 struct lpuart_port, port);
956 struct dma_chan *tx_chan;
957 struct dma_slave_config dma_tx_sconfig;
958 dma_addr_t dma_bus;
959 unsigned char *dma_buf;
960 int ret;
961
962 tx_chan = dma_request_slave_channel(sport->port.dev, "tx");
963
964 if (!tx_chan) {
965 dev_err(sport->port.dev, "Dma tx channel request failed!\n");
966 return -ENODEV;
967 }
968
969 dma_bus = dma_map_single(tx_chan->device->dev,
970 sport->port.state->xmit.buf,
971 UART_XMIT_SIZE, DMA_TO_DEVICE);
972
973 if (dma_mapping_error(tx_chan->device->dev, dma_bus)) {
974 dev_err(sport->port.dev, "dma_map_single tx failed\n");
975 dma_release_channel(tx_chan);
976 return -ENOMEM;
977 }
978
979 dma_buf = sport->port.state->xmit.buf;
980 dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDR;
981 dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
982 dma_tx_sconfig.dst_maxburst = sport->txfifo_size;
983 dma_tx_sconfig.direction = DMA_MEM_TO_DEV;
984 ret = dmaengine_slave_config(tx_chan, &dma_tx_sconfig);
985
986 if (ret < 0) {
987 dev_err(sport->port.dev,
988 "Dma slave config failed, err = %d\n", ret);
989 dma_release_channel(tx_chan);
990 return ret;
991 }
992
993 sport->dma_tx_chan = tx_chan;
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_chan *rx_chan;
1006 struct dma_slave_config dma_rx_sconfig;
1007 dma_addr_t dma_bus;
1008 unsigned char *dma_buf;
1009 int ret;
1010
1011 rx_chan = dma_request_slave_channel(sport->port.dev, "rx");
1012
1013 if (!rx_chan) {
1014 dev_err(sport->port.dev, "Dma rx channel request failed!\n");
1015 return -ENODEV;
1016 }
1017
1018 dma_buf = devm_kzalloc(sport->port.dev,
1019 FSL_UART_RX_DMA_BUFFER_SIZE, GFP_KERNEL);
1020
1021 if (!dma_buf) {
1022 dev_err(sport->port.dev, "Dma rx alloc failed\n");
1023 dma_release_channel(rx_chan);
1024 return -ENOMEM;
1025 }
1026
1027 dma_bus = dma_map_single(rx_chan->device->dev, dma_buf,
1028 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
1029
1030 if (dma_mapping_error(rx_chan->device->dev, dma_bus)) {
1031 dev_err(sport->port.dev, "dma_map_single rx failed\n");
1032 dma_release_channel(rx_chan);
1033 return -ENOMEM;
1034 }
1035
1036 dma_rx_sconfig.src_addr = sport->port.mapbase + UARTDR;
1037 dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1038 dma_rx_sconfig.src_maxburst = 1;
1039 dma_rx_sconfig.direction = DMA_DEV_TO_MEM;
1040 ret = dmaengine_slave_config(rx_chan, &dma_rx_sconfig);
1041
1042 if (ret < 0) {
1043 dev_err(sport->port.dev,
1044 "Dma slave config failed, err = %d\n", ret);
1045 dma_release_channel(rx_chan);
1046 return ret;
1047 }
1048
1049 sport->dma_rx_chan = rx_chan;
1050 sport->dma_rx_buf_virt = dma_buf;
1051 sport->dma_rx_buf_bus = dma_bus;
1052 sport->dma_rx_in_progress = 0;
1053
1054 return 0;
1055 }
1056
1057 static void lpuart_dma_tx_free(struct uart_port *port)
1058 {
1059 struct lpuart_port *sport = container_of(port,
1060 struct lpuart_port, port);
1061 struct dma_chan *dma_chan;
1062
1063 dma_unmap_single(sport->port.dev, sport->dma_tx_buf_bus,
1064 UART_XMIT_SIZE, DMA_TO_DEVICE);
1065 dma_chan = sport->dma_tx_chan;
1066 sport->dma_tx_chan = NULL;
1067 sport->dma_tx_buf_bus = 0;
1068 sport->dma_tx_buf_virt = NULL;
1069 dma_release_channel(dma_chan);
1070 }
1071
1072 static void lpuart_dma_rx_free(struct uart_port *port)
1073 {
1074 struct lpuart_port *sport = container_of(port,
1075 struct lpuart_port, port);
1076 struct dma_chan *dma_chan;
1077
1078 dma_unmap_single(sport->port.dev, sport->dma_rx_buf_bus,
1079 FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
1080
1081 dma_chan = sport->dma_rx_chan;
1082 sport->dma_rx_chan = NULL;
1083 sport->dma_rx_buf_bus = 0;
1084 sport->dma_rx_buf_virt = NULL;
1085 dma_release_channel(dma_chan);
1086 }
1087
1088 static int lpuart_startup(struct uart_port *port)
1089 {
1090 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1091 int ret;
1092 unsigned long flags;
1093 unsigned char temp;
1094
1095 /* determine FIFO size and enable FIFO mode */
1096 temp = readb(sport->port.membase + UARTPFIFO);
1097
1098 sport->txfifo_size = 0x1 << (((temp >> UARTPFIFO_TXSIZE_OFF) &
1099 UARTPFIFO_FIFOSIZE_MASK) + 1);
1100
1101 sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &
1102 UARTPFIFO_FIFOSIZE_MASK) + 1);
1103
1104 /* Whether use dma support by dma request results */
1105 if (lpuart_dma_tx_request(port) || lpuart_dma_rx_request(port)) {
1106 sport->lpuart_dma_use = false;
1107 } else {
1108 sport->lpuart_dma_use = true;
1109 temp = readb(port->membase + UARTCR5);
1110 writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
1111 }
1112
1113 ret = devm_request_irq(port->dev, port->irq, lpuart_int, 0,
1114 DRIVER_NAME, sport);
1115 if (ret)
1116 return ret;
1117
1118 spin_lock_irqsave(&sport->port.lock, flags);
1119
1120 lpuart_setup_watermark(sport);
1121
1122 temp = readb(sport->port.membase + UARTCR2);
1123 temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE);
1124 writeb(temp, sport->port.membase + UARTCR2);
1125
1126 spin_unlock_irqrestore(&sport->port.lock, flags);
1127 return 0;
1128 }
1129
1130 static int lpuart32_startup(struct uart_port *port)
1131 {
1132 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1133 int ret;
1134 unsigned long flags;
1135 unsigned long temp;
1136
1137 /* determine FIFO size */
1138 temp = lpuart32_read(sport->port.membase + UARTFIFO);
1139
1140 sport->txfifo_size = 0x1 << (((temp >> UARTFIFO_TXSIZE_OFF) &
1141 UARTFIFO_FIFOSIZE_MASK) - 1);
1142
1143 sport->rxfifo_size = 0x1 << (((temp >> UARTFIFO_RXSIZE_OFF) &
1144 UARTFIFO_FIFOSIZE_MASK) - 1);
1145
1146 ret = devm_request_irq(port->dev, port->irq, lpuart32_int, 0,
1147 DRIVER_NAME, sport);
1148 if (ret)
1149 return ret;
1150
1151 spin_lock_irqsave(&sport->port.lock, flags);
1152
1153 lpuart32_setup_watermark(sport);
1154
1155 temp = lpuart32_read(sport->port.membase + UARTCTRL);
1156 temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE | UARTCTRL_TE);
1157 temp |= UARTCTRL_ILIE;
1158 lpuart32_write(temp, sport->port.membase + UARTCTRL);
1159
1160 spin_unlock_irqrestore(&sport->port.lock, flags);
1161 return 0;
1162 }
1163
1164 static void lpuart_shutdown(struct uart_port *port)
1165 {
1166 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1167 unsigned char temp;
1168 unsigned long flags;
1169
1170 spin_lock_irqsave(&port->lock, flags);
1171
1172 /* disable Rx/Tx and interrupts */
1173 temp = readb(port->membase + UARTCR2);
1174 temp &= ~(UARTCR2_TE | UARTCR2_RE |
1175 UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
1176 writeb(temp, port->membase + UARTCR2);
1177
1178 spin_unlock_irqrestore(&port->lock, flags);
1179
1180 devm_free_irq(port->dev, port->irq, sport);
1181
1182 if (sport->lpuart_dma_use) {
1183 lpuart_dma_tx_free(port);
1184 lpuart_dma_rx_free(port);
1185 }
1186 }
1187
1188 static void lpuart32_shutdown(struct uart_port *port)
1189 {
1190 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1191 unsigned long temp;
1192 unsigned long flags;
1193
1194 spin_lock_irqsave(&port->lock, flags);
1195
1196 /* disable Rx/Tx and interrupts */
1197 temp = lpuart32_read(port->membase + UARTCTRL);
1198 temp &= ~(UARTCTRL_TE | UARTCTRL_RE |
1199 UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
1200 lpuart32_write(temp, port->membase + UARTCTRL);
1201
1202 spin_unlock_irqrestore(&port->lock, flags);
1203
1204 devm_free_irq(port->dev, port->irq, sport);
1205 }
1206
1207 static void
1208 lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
1209 struct ktermios *old)
1210 {
1211 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1212 unsigned long flags;
1213 unsigned char cr1, old_cr1, old_cr2, cr4, bdh, modem;
1214 unsigned int baud;
1215 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
1216 unsigned int sbr, brfa;
1217
1218 cr1 = old_cr1 = readb(sport->port.membase + UARTCR1);
1219 old_cr2 = readb(sport->port.membase + UARTCR2);
1220 cr4 = readb(sport->port.membase + UARTCR4);
1221 bdh = readb(sport->port.membase + UARTBDH);
1222 modem = readb(sport->port.membase + UARTMODEM);
1223 /*
1224 * only support CS8 and CS7, and for CS7 must enable PE.
1225 * supported mode:
1226 * - (7,e/o,1)
1227 * - (8,n,1)
1228 * - (8,m/s,1)
1229 * - (8,e/o,1)
1230 */
1231 while ((termios->c_cflag & CSIZE) != CS8 &&
1232 (termios->c_cflag & CSIZE) != CS7) {
1233 termios->c_cflag &= ~CSIZE;
1234 termios->c_cflag |= old_csize;
1235 old_csize = CS8;
1236 }
1237
1238 if ((termios->c_cflag & CSIZE) == CS8 ||
1239 (termios->c_cflag & CSIZE) == CS7)
1240 cr1 = old_cr1 & ~UARTCR1_M;
1241
1242 if (termios->c_cflag & CMSPAR) {
1243 if ((termios->c_cflag & CSIZE) != CS8) {
1244 termios->c_cflag &= ~CSIZE;
1245 termios->c_cflag |= CS8;
1246 }
1247 cr1 |= UARTCR1_M;
1248 }
1249
1250 if (termios->c_cflag & CRTSCTS) {
1251 modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1252 } else {
1253 termios->c_cflag &= ~CRTSCTS;
1254 modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1255 }
1256
1257 if (termios->c_cflag & CSTOPB)
1258 termios->c_cflag &= ~CSTOPB;
1259
1260 /* parity must be enabled when CS7 to match 8-bits format */
1261 if ((termios->c_cflag & CSIZE) == CS7)
1262 termios->c_cflag |= PARENB;
1263
1264 if ((termios->c_cflag & PARENB)) {
1265 if (termios->c_cflag & CMSPAR) {
1266 cr1 &= ~UARTCR1_PE;
1267 cr1 |= UARTCR1_M;
1268 } else {
1269 cr1 |= UARTCR1_PE;
1270 if ((termios->c_cflag & CSIZE) == CS8)
1271 cr1 |= UARTCR1_M;
1272 if (termios->c_cflag & PARODD)
1273 cr1 |= UARTCR1_PT;
1274 else
1275 cr1 &= ~UARTCR1_PT;
1276 }
1277 }
1278
1279 /* ask the core to calculate the divisor */
1280 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
1281
1282 spin_lock_irqsave(&sport->port.lock, flags);
1283
1284 sport->port.read_status_mask = 0;
1285 if (termios->c_iflag & INPCK)
1286 sport->port.read_status_mask |= (UARTSR1_FE | UARTSR1_PE);
1287 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1288 sport->port.read_status_mask |= UARTSR1_FE;
1289
1290 /* characters to ignore */
1291 sport->port.ignore_status_mask = 0;
1292 if (termios->c_iflag & IGNPAR)
1293 sport->port.ignore_status_mask |= UARTSR1_PE;
1294 if (termios->c_iflag & IGNBRK) {
1295 sport->port.ignore_status_mask |= UARTSR1_FE;
1296 /*
1297 * if we're ignoring parity and break indicators,
1298 * ignore overruns too (for real raw support).
1299 */
1300 if (termios->c_iflag & IGNPAR)
1301 sport->port.ignore_status_mask |= UARTSR1_OR;
1302 }
1303
1304 /* update the per-port timeout */
1305 uart_update_timeout(port, termios->c_cflag, baud);
1306
1307 if (sport->lpuart_dma_use) {
1308 /* Calculate delay for 1.5 DMA buffers */
1309 sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
1310 FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
1311 sport->rxfifo_size / 2;
1312 dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
1313 sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout);
1314 if (sport->dma_rx_timeout < msecs_to_jiffies(20))
1315 sport->dma_rx_timeout = msecs_to_jiffies(20);
1316 }
1317
1318 /* wait transmit engin complete */
1319 while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
1320 barrier();
1321
1322 /* disable transmit and receive */
1323 writeb(old_cr2 & ~(UARTCR2_TE | UARTCR2_RE),
1324 sport->port.membase + UARTCR2);
1325
1326 sbr = sport->port.uartclk / (16 * baud);
1327 brfa = ((sport->port.uartclk - (16 * sbr * baud)) * 2) / baud;
1328 bdh &= ~UARTBDH_SBR_MASK;
1329 bdh |= (sbr >> 8) & 0x1F;
1330 cr4 &= ~UARTCR4_BRFA_MASK;
1331 brfa &= UARTCR4_BRFA_MASK;
1332 writeb(cr4 | brfa, sport->port.membase + UARTCR4);
1333 writeb(bdh, sport->port.membase + UARTBDH);
1334 writeb(sbr & 0xFF, sport->port.membase + UARTBDL);
1335 writeb(cr1, sport->port.membase + UARTCR1);
1336 writeb(modem, sport->port.membase + UARTMODEM);
1337
1338 /* restore control register */
1339 writeb(old_cr2, sport->port.membase + UARTCR2);
1340
1341 spin_unlock_irqrestore(&sport->port.lock, flags);
1342 }
1343
1344 static void
1345 lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
1346 struct ktermios *old)
1347 {
1348 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1349 unsigned long flags;
1350 unsigned long ctrl, old_ctrl, bd, modem;
1351 unsigned int baud;
1352 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
1353 unsigned int sbr;
1354
1355 ctrl = old_ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
1356 bd = lpuart32_read(sport->port.membase + UARTBAUD);
1357 modem = lpuart32_read(sport->port.membase + UARTMODIR);
1358 /*
1359 * only support CS8 and CS7, and for CS7 must enable PE.
1360 * supported mode:
1361 * - (7,e/o,1)
1362 * - (8,n,1)
1363 * - (8,m/s,1)
1364 * - (8,e/o,1)
1365 */
1366 while ((termios->c_cflag & CSIZE) != CS8 &&
1367 (termios->c_cflag & CSIZE) != CS7) {
1368 termios->c_cflag &= ~CSIZE;
1369 termios->c_cflag |= old_csize;
1370 old_csize = CS8;
1371 }
1372
1373 if ((termios->c_cflag & CSIZE) == CS8 ||
1374 (termios->c_cflag & CSIZE) == CS7)
1375 ctrl = old_ctrl & ~UARTCTRL_M;
1376
1377 if (termios->c_cflag & CMSPAR) {
1378 if ((termios->c_cflag & CSIZE) != CS8) {
1379 termios->c_cflag &= ~CSIZE;
1380 termios->c_cflag |= CS8;
1381 }
1382 ctrl |= UARTCTRL_M;
1383 }
1384
1385 if (termios->c_cflag & CRTSCTS) {
1386 modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1387 } else {
1388 termios->c_cflag &= ~CRTSCTS;
1389 modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1390 }
1391
1392 if (termios->c_cflag & CSTOPB)
1393 termios->c_cflag &= ~CSTOPB;
1394
1395 /* parity must be enabled when CS7 to match 8-bits format */
1396 if ((termios->c_cflag & CSIZE) == CS7)
1397 termios->c_cflag |= PARENB;
1398
1399 if ((termios->c_cflag & PARENB)) {
1400 if (termios->c_cflag & CMSPAR) {
1401 ctrl &= ~UARTCTRL_PE;
1402 ctrl |= UARTCTRL_M;
1403 } else {
1404 ctrl |= UARTCR1_PE;
1405 if ((termios->c_cflag & CSIZE) == CS8)
1406 ctrl |= UARTCTRL_M;
1407 if (termios->c_cflag & PARODD)
1408 ctrl |= UARTCTRL_PT;
1409 else
1410 ctrl &= ~UARTCTRL_PT;
1411 }
1412 }
1413
1414 /* ask the core to calculate the divisor */
1415 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
1416
1417 spin_lock_irqsave(&sport->port.lock, flags);
1418
1419 sport->port.read_status_mask = 0;
1420 if (termios->c_iflag & INPCK)
1421 sport->port.read_status_mask |= (UARTSTAT_FE | UARTSTAT_PE);
1422 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1423 sport->port.read_status_mask |= UARTSTAT_FE;
1424
1425 /* characters to ignore */
1426 sport->port.ignore_status_mask = 0;
1427 if (termios->c_iflag & IGNPAR)
1428 sport->port.ignore_status_mask |= UARTSTAT_PE;
1429 if (termios->c_iflag & IGNBRK) {
1430 sport->port.ignore_status_mask |= UARTSTAT_FE;
1431 /*
1432 * if we're ignoring parity and break indicators,
1433 * ignore overruns too (for real raw support).
1434 */
1435 if (termios->c_iflag & IGNPAR)
1436 sport->port.ignore_status_mask |= UARTSTAT_OR;
1437 }
1438
1439 /* update the per-port timeout */
1440 uart_update_timeout(port, termios->c_cflag, baud);
1441
1442 /* wait transmit engin complete */
1443 while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
1444 barrier();
1445
1446 /* disable transmit and receive */
1447 lpuart32_write(old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
1448 sport->port.membase + UARTCTRL);
1449
1450 sbr = sport->port.uartclk / (16 * baud);
1451 bd &= ~UARTBAUD_SBR_MASK;
1452 bd |= sbr & UARTBAUD_SBR_MASK;
1453 bd |= UARTBAUD_BOTHEDGE;
1454 bd &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);
1455 lpuart32_write(bd, sport->port.membase + UARTBAUD);
1456 lpuart32_write(modem, sport->port.membase + UARTMODIR);
1457 lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
1458 /* restore control register */
1459
1460 spin_unlock_irqrestore(&sport->port.lock, flags);
1461 }
1462
1463 static const char *lpuart_type(struct uart_port *port)
1464 {
1465 return "FSL_LPUART";
1466 }
1467
1468 static void lpuart_release_port(struct uart_port *port)
1469 {
1470 /* nothing to do */
1471 }
1472
1473 static int lpuart_request_port(struct uart_port *port)
1474 {
1475 return 0;
1476 }
1477
1478 /* configure/autoconfigure the port */
1479 static void lpuart_config_port(struct uart_port *port, int flags)
1480 {
1481 if (flags & UART_CONFIG_TYPE)
1482 port->type = PORT_LPUART;
1483 }
1484
1485 static int lpuart_verify_port(struct uart_port *port, struct serial_struct *ser)
1486 {
1487 int ret = 0;
1488
1489 if (ser->type != PORT_UNKNOWN && ser->type != PORT_LPUART)
1490 ret = -EINVAL;
1491 if (port->irq != ser->irq)
1492 ret = -EINVAL;
1493 if (ser->io_type != UPIO_MEM)
1494 ret = -EINVAL;
1495 if (port->uartclk / 16 != ser->baud_base)
1496 ret = -EINVAL;
1497 if (port->iobase != ser->port)
1498 ret = -EINVAL;
1499 if (ser->hub6 != 0)
1500 ret = -EINVAL;
1501 return ret;
1502 }
1503
1504 static struct uart_ops lpuart_pops = {
1505 .tx_empty = lpuart_tx_empty,
1506 .set_mctrl = lpuart_set_mctrl,
1507 .get_mctrl = lpuart_get_mctrl,
1508 .stop_tx = lpuart_stop_tx,
1509 .start_tx = lpuart_start_tx,
1510 .stop_rx = lpuart_stop_rx,
1511 .break_ctl = lpuart_break_ctl,
1512 .startup = lpuart_startup,
1513 .shutdown = lpuart_shutdown,
1514 .set_termios = lpuart_set_termios,
1515 .type = lpuart_type,
1516 .request_port = lpuart_request_port,
1517 .release_port = lpuart_release_port,
1518 .config_port = lpuart_config_port,
1519 .verify_port = lpuart_verify_port,
1520 };
1521
1522 static struct uart_ops lpuart32_pops = {
1523 .tx_empty = lpuart32_tx_empty,
1524 .set_mctrl = lpuart32_set_mctrl,
1525 .get_mctrl = lpuart32_get_mctrl,
1526 .stop_tx = lpuart32_stop_tx,
1527 .start_tx = lpuart32_start_tx,
1528 .stop_rx = lpuart32_stop_rx,
1529 .break_ctl = lpuart32_break_ctl,
1530 .startup = lpuart32_startup,
1531 .shutdown = lpuart32_shutdown,
1532 .set_termios = lpuart32_set_termios,
1533 .type = lpuart_type,
1534 .request_port = lpuart_request_port,
1535 .release_port = lpuart_release_port,
1536 .config_port = lpuart_config_port,
1537 .verify_port = lpuart_verify_port,
1538 };
1539
1540 static struct lpuart_port *lpuart_ports[UART_NR];
1541
1542 #ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
1543 static void lpuart_console_putchar(struct uart_port *port, int ch)
1544 {
1545 while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
1546 barrier();
1547
1548 writeb(ch, port->membase + UARTDR);
1549 }
1550
1551 static void lpuart32_console_putchar(struct uart_port *port, int ch)
1552 {
1553 while (!(lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE))
1554 barrier();
1555
1556 lpuart32_write(ch, port->membase + UARTDATA);
1557 }
1558
1559 static void
1560 lpuart_console_write(struct console *co, const char *s, unsigned int count)
1561 {
1562 struct lpuart_port *sport = lpuart_ports[co->index];
1563 unsigned char old_cr2, cr2;
1564
1565 /* first save CR2 and then disable interrupts */
1566 cr2 = old_cr2 = readb(sport->port.membase + UARTCR2);
1567 cr2 |= (UARTCR2_TE | UARTCR2_RE);
1568 cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
1569 writeb(cr2, sport->port.membase + UARTCR2);
1570
1571 uart_console_write(&sport->port, s, count, lpuart_console_putchar);
1572
1573 /* wait for transmitter finish complete and restore CR2 */
1574 while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
1575 barrier();
1576
1577 writeb(old_cr2, sport->port.membase + UARTCR2);
1578 }
1579
1580 static void
1581 lpuart32_console_write(struct console *co, const char *s, unsigned int count)
1582 {
1583 struct lpuart_port *sport = lpuart_ports[co->index];
1584 unsigned long old_cr, cr;
1585
1586 /* first save CR2 and then disable interrupts */
1587 cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL);
1588 cr |= (UARTCTRL_TE | UARTCTRL_RE);
1589 cr &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
1590 lpuart32_write(cr, sport->port.membase + UARTCTRL);
1591
1592 uart_console_write(&sport->port, s, count, lpuart32_console_putchar);
1593
1594 /* wait for transmitter finish complete and restore CR2 */
1595 while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
1596 barrier();
1597
1598 lpuart32_write(old_cr, sport->port.membase + UARTCTRL);
1599 }
1600
1601 /*
1602 * if the port was already initialised (eg, by a boot loader),
1603 * try to determine the current setup.
1604 */
1605 static void __init
1606 lpuart_console_get_options(struct lpuart_port *sport, int *baud,
1607 int *parity, int *bits)
1608 {
1609 unsigned char cr, bdh, bdl, brfa;
1610 unsigned int sbr, uartclk, baud_raw;
1611
1612 cr = readb(sport->port.membase + UARTCR2);
1613 cr &= UARTCR2_TE | UARTCR2_RE;
1614 if (!cr)
1615 return;
1616
1617 /* ok, the port was enabled */
1618
1619 cr = readb(sport->port.membase + UARTCR1);
1620
1621 *parity = 'n';
1622 if (cr & UARTCR1_PE) {
1623 if (cr & UARTCR1_PT)
1624 *parity = 'o';
1625 else
1626 *parity = 'e';
1627 }
1628
1629 if (cr & UARTCR1_M)
1630 *bits = 9;
1631 else
1632 *bits = 8;
1633
1634 bdh = readb(sport->port.membase + UARTBDH);
1635 bdh &= UARTBDH_SBR_MASK;
1636 bdl = readb(sport->port.membase + UARTBDL);
1637 sbr = bdh;
1638 sbr <<= 8;
1639 sbr |= bdl;
1640 brfa = readb(sport->port.membase + UARTCR4);
1641 brfa &= UARTCR4_BRFA_MASK;
1642
1643 uartclk = clk_get_rate(sport->clk);
1644 /*
1645 * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
1646 */
1647 baud_raw = uartclk / (16 * (sbr + brfa / 32));
1648
1649 if (*baud != baud_raw)
1650 printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
1651 "from %d to %d\n", baud_raw, *baud);
1652 }
1653
1654 static void __init
1655 lpuart32_console_get_options(struct lpuart_port *sport, int *baud,
1656 int *parity, int *bits)
1657 {
1658 unsigned long cr, bd;
1659 unsigned int sbr, uartclk, baud_raw;
1660
1661 cr = lpuart32_read(sport->port.membase + UARTCTRL);
1662 cr &= UARTCTRL_TE | UARTCTRL_RE;
1663 if (!cr)
1664 return;
1665
1666 /* ok, the port was enabled */
1667
1668 cr = lpuart32_read(sport->port.membase + UARTCTRL);
1669
1670 *parity = 'n';
1671 if (cr & UARTCTRL_PE) {
1672 if (cr & UARTCTRL_PT)
1673 *parity = 'o';
1674 else
1675 *parity = 'e';
1676 }
1677
1678 if (cr & UARTCTRL_M)
1679 *bits = 9;
1680 else
1681 *bits = 8;
1682
1683 bd = lpuart32_read(sport->port.membase + UARTBAUD);
1684 bd &= UARTBAUD_SBR_MASK;
1685 sbr = bd;
1686 uartclk = clk_get_rate(sport->clk);
1687 /*
1688 * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
1689 */
1690 baud_raw = uartclk / (16 * sbr);
1691
1692 if (*baud != baud_raw)
1693 printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
1694 "from %d to %d\n", baud_raw, *baud);
1695 }
1696
1697 static int __init lpuart_console_setup(struct console *co, char *options)
1698 {
1699 struct lpuart_port *sport;
1700 int baud = 115200;
1701 int bits = 8;
1702 int parity = 'n';
1703 int flow = 'n';
1704
1705 /*
1706 * check whether an invalid uart number has been specified, and
1707 * if so, search for the first available port that does have
1708 * console support.
1709 */
1710 if (co->index == -1 || co->index >= ARRAY_SIZE(lpuart_ports))
1711 co->index = 0;
1712
1713 sport = lpuart_ports[co->index];
1714 if (sport == NULL)
1715 return -ENODEV;
1716
1717 if (options)
1718 uart_parse_options(options, &baud, &parity, &bits, &flow);
1719 else
1720 if (sport->lpuart32)
1721 lpuart32_console_get_options(sport, &baud, &parity, &bits);
1722 else
1723 lpuart_console_get_options(sport, &baud, &parity, &bits);
1724
1725 if (sport->lpuart32)
1726 lpuart32_setup_watermark(sport);
1727 else
1728 lpuart_setup_watermark(sport);
1729
1730 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
1731 }
1732
1733 static struct uart_driver lpuart_reg;
1734 static struct console lpuart_console = {
1735 .name = DEV_NAME,
1736 .write = lpuart_console_write,
1737 .device = uart_console_device,
1738 .setup = lpuart_console_setup,
1739 .flags = CON_PRINTBUFFER,
1740 .index = -1,
1741 .data = &lpuart_reg,
1742 };
1743
1744 static struct console lpuart32_console = {
1745 .name = DEV_NAME,
1746 .write = lpuart32_console_write,
1747 .device = uart_console_device,
1748 .setup = lpuart_console_setup,
1749 .flags = CON_PRINTBUFFER,
1750 .index = -1,
1751 .data = &lpuart_reg,
1752 };
1753
1754 #define LPUART_CONSOLE (&lpuart_console)
1755 #define LPUART32_CONSOLE (&lpuart32_console)
1756 #else
1757 #define LPUART_CONSOLE NULL
1758 #define LPUART32_CONSOLE NULL
1759 #endif
1760
1761 static struct uart_driver lpuart_reg = {
1762 .owner = THIS_MODULE,
1763 .driver_name = DRIVER_NAME,
1764 .dev_name = DEV_NAME,
1765 .nr = ARRAY_SIZE(lpuart_ports),
1766 .cons = LPUART_CONSOLE,
1767 };
1768
1769 static int lpuart_probe(struct platform_device *pdev)
1770 {
1771 struct device_node *np = pdev->dev.of_node;
1772 struct lpuart_port *sport;
1773 struct resource *res;
1774 int ret;
1775
1776 sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
1777 if (!sport)
1778 return -ENOMEM;
1779
1780 pdev->dev.coherent_dma_mask = 0;
1781
1782 ret = of_alias_get_id(np, "serial");
1783 if (ret < 0) {
1784 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
1785 return ret;
1786 }
1787 sport->port.line = ret;
1788 sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
1789 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1790 if (!res)
1791 return -ENODEV;
1792
1793 sport->port.mapbase = res->start;
1794 sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
1795 if (IS_ERR(sport->port.membase))
1796 return PTR_ERR(sport->port.membase);
1797
1798 sport->port.dev = &pdev->dev;
1799 sport->port.type = PORT_LPUART;
1800 sport->port.iotype = UPIO_MEM;
1801 sport->port.irq = platform_get_irq(pdev, 0);
1802 if (sport->lpuart32)
1803 sport->port.ops = &lpuart32_pops;
1804 else
1805 sport->port.ops = &lpuart_pops;
1806 sport->port.flags = UPF_BOOT_AUTOCONF;
1807
1808 sport->clk = devm_clk_get(&pdev->dev, "ipg");
1809 if (IS_ERR(sport->clk)) {
1810 ret = PTR_ERR(sport->clk);
1811 dev_err(&pdev->dev, "failed to get uart clk: %d\n", ret);
1812 return ret;
1813 }
1814
1815 ret = clk_prepare_enable(sport->clk);
1816 if (ret) {
1817 dev_err(&pdev->dev, "failed to enable uart clk: %d\n", ret);
1818 return ret;
1819 }
1820
1821 sport->port.uartclk = clk_get_rate(sport->clk);
1822
1823 lpuart_ports[sport->port.line] = sport;
1824
1825 platform_set_drvdata(pdev, &sport->port);
1826
1827 if (sport->lpuart32)
1828 lpuart_reg.cons = LPUART32_CONSOLE;
1829 else
1830 lpuart_reg.cons = LPUART_CONSOLE;
1831
1832 ret = uart_add_one_port(&lpuart_reg, &sport->port);
1833 if (ret) {
1834 clk_disable_unprepare(sport->clk);
1835 return ret;
1836 }
1837
1838 return 0;
1839 }
1840
1841 static int lpuart_remove(struct platform_device *pdev)
1842 {
1843 struct lpuart_port *sport = platform_get_drvdata(pdev);
1844
1845 uart_remove_one_port(&lpuart_reg, &sport->port);
1846
1847 clk_disable_unprepare(sport->clk);
1848
1849 return 0;
1850 }
1851
1852 #ifdef CONFIG_PM_SLEEP
1853 static int lpuart_suspend(struct device *dev)
1854 {
1855 struct lpuart_port *sport = dev_get_drvdata(dev);
1856
1857 uart_suspend_port(&lpuart_reg, &sport->port);
1858
1859 return 0;
1860 }
1861
1862 static int lpuart_resume(struct device *dev)
1863 {
1864 struct lpuart_port *sport = dev_get_drvdata(dev);
1865
1866 uart_resume_port(&lpuart_reg, &sport->port);
1867
1868 return 0;
1869 }
1870 #endif
1871
1872 static SIMPLE_DEV_PM_OPS(lpuart_pm_ops, lpuart_suspend, lpuart_resume);
1873
1874 static struct platform_driver lpuart_driver = {
1875 .probe = lpuart_probe,
1876 .remove = lpuart_remove,
1877 .driver = {
1878 .name = "fsl-lpuart",
1879 .owner = THIS_MODULE,
1880 .of_match_table = lpuart_dt_ids,
1881 .pm = &lpuart_pm_ops,
1882 },
1883 };
1884
1885 static int __init lpuart_serial_init(void)
1886 {
1887 int ret;
1888
1889 pr_info("serial: Freescale lpuart driver\n");
1890
1891 ret = uart_register_driver(&lpuart_reg);
1892 if (ret)
1893 return ret;
1894
1895 ret = platform_driver_register(&lpuart_driver);
1896 if (ret)
1897 uart_unregister_driver(&lpuart_reg);
1898
1899 return ret;
1900 }
1901
1902 static void __exit lpuart_serial_exit(void)
1903 {
1904 platform_driver_unregister(&lpuart_driver);
1905 uart_unregister_driver(&lpuart_reg);
1906 }
1907
1908 module_init(lpuart_serial_init);
1909 module_exit(lpuart_serial_exit);
1910
1911 MODULE_DESCRIPTION("Freescale lpuart serial port driver");
1912 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support