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 const 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
lpuart32_read(void __iomem * addr)275 static u32 lpuart32_read(void __iomem *addr)
276 {
277 return ioread32be(addr);
278 }
279
lpuart32_write(u32 val,void __iomem * addr)280 static void lpuart32_write(u32 val, void __iomem *addr)
281 {
282 iowrite32be(val, addr);
283 }
284
lpuart_stop_tx(struct uart_port * port)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
lpuart32_stop_tx(struct uart_port * port)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
lpuart_stop_rx(struct uart_port * port)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
lpuart32_stop_rx(struct uart_port * port)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
lpuart_copy_rx_to_tty(struct lpuart_port * sport,struct tty_port * tty,int count)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
lpuart_pio_tx(struct lpuart_port * sport)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
lpuart_dma_tx(struct lpuart_port * sport,unsigned long count)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
lpuart_prepare_tx(struct lpuart_port * sport)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
lpuart_dma_tx_complete(void * arg)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
lpuart_dma_rx(struct lpuart_port * sport)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
lpuart_flush_buffer(struct uart_port * port)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
lpuart_dma_rx_complete(void * arg)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
lpuart_timer_func(unsigned long data)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
lpuart_prepare_rx(struct lpuart_port * sport)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
lpuart_transmit_buffer(struct lpuart_port * sport)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
lpuart32_transmit_buffer(struct lpuart_port * sport)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
lpuart_start_tx(struct uart_port * port)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
lpuart32_start_tx(struct uart_port * port)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
lpuart_txint(int irq,void * dev_id)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
lpuart_rxint(int irq,void * dev_id)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
lpuart32_rxint(int irq,void * dev_id)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
lpuart_int(int irq,void * dev_id)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
lpuart32_int(int irq,void * dev_id)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 */
lpuart_tx_empty(struct uart_port * port)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
lpuart32_tx_empty(struct uart_port * port)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
lpuart_get_mctrl(struct uart_port * port)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
lpuart32_get_mctrl(struct uart_port * port)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
lpuart_set_mctrl(struct uart_port * port,unsigned int mctrl)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
lpuart32_set_mctrl(struct uart_port * port,unsigned int mctrl)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
lpuart_break_ctl(struct uart_port * port,int break_state)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
lpuart32_break_ctl(struct uart_port * port,int break_state)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
lpuart_setup_watermark(struct lpuart_port * sport)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
lpuart32_setup_watermark(struct lpuart_port * sport)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
lpuart_dma_tx_request(struct uart_port * port)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
lpuart_dma_rx_request(struct uart_port * port)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
lpuart_dma_tx_free(struct uart_port * port)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
lpuart_dma_rx_free(struct uart_port * port)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
lpuart_startup(struct uart_port * port)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
lpuart32_startup(struct uart_port * port)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
lpuart_shutdown(struct uart_port * port)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
lpuart32_shutdown(struct uart_port * port)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
lpuart_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)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 } else {
1271 cr1 &= ~UARTCR1_PE;
1272 }
1273
1274 /* ask the core to calculate the divisor */
1275 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
1276
1277 spin_lock_irqsave(&sport->port.lock, flags);
1278
1279 sport->port.read_status_mask = 0;
1280 if (termios->c_iflag & INPCK)
1281 sport->port.read_status_mask |= (UARTSR1_FE | UARTSR1_PE);
1282 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1283 sport->port.read_status_mask |= UARTSR1_FE;
1284
1285 /* characters to ignore */
1286 sport->port.ignore_status_mask = 0;
1287 if (termios->c_iflag & IGNPAR)
1288 sport->port.ignore_status_mask |= UARTSR1_PE;
1289 if (termios->c_iflag & IGNBRK) {
1290 sport->port.ignore_status_mask |= UARTSR1_FE;
1291 /*
1292 * if we're ignoring parity and break indicators,
1293 * ignore overruns too (for real raw support).
1294 */
1295 if (termios->c_iflag & IGNPAR)
1296 sport->port.ignore_status_mask |= UARTSR1_OR;
1297 }
1298
1299 /* update the per-port timeout */
1300 uart_update_timeout(port, termios->c_cflag, baud);
1301
1302 if (sport->lpuart_dma_rx_use) {
1303 /* Calculate delay for 1.5 DMA buffers */
1304 sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
1305 FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
1306 sport->rxfifo_size / 2;
1307 dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
1308 sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout);
1309 if (sport->dma_rx_timeout < msecs_to_jiffies(20))
1310 sport->dma_rx_timeout = msecs_to_jiffies(20);
1311 }
1312
1313 /* wait transmit engin complete */
1314 while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
1315 barrier();
1316
1317 /* disable transmit and receive */
1318 writeb(old_cr2 & ~(UARTCR2_TE | UARTCR2_RE),
1319 sport->port.membase + UARTCR2);
1320
1321 sbr = sport->port.uartclk / (16 * baud);
1322 brfa = ((sport->port.uartclk - (16 * sbr * baud)) * 2) / baud;
1323 bdh &= ~UARTBDH_SBR_MASK;
1324 bdh |= (sbr >> 8) & 0x1F;
1325 cr4 &= ~UARTCR4_BRFA_MASK;
1326 brfa &= UARTCR4_BRFA_MASK;
1327 writeb(cr4 | brfa, sport->port.membase + UARTCR4);
1328 writeb(bdh, sport->port.membase + UARTBDH);
1329 writeb(sbr & 0xFF, sport->port.membase + UARTBDL);
1330 writeb(cr1, sport->port.membase + UARTCR1);
1331 writeb(modem, sport->port.membase + UARTMODEM);
1332
1333 /* restore control register */
1334 writeb(old_cr2, sport->port.membase + UARTCR2);
1335
1336 spin_unlock_irqrestore(&sport->port.lock, flags);
1337 }
1338
1339 static void
lpuart32_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)1340 lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
1341 struct ktermios *old)
1342 {
1343 struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
1344 unsigned long flags;
1345 unsigned long ctrl, old_ctrl, bd, modem;
1346 unsigned int baud;
1347 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
1348 unsigned int sbr;
1349
1350 ctrl = old_ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
1351 bd = lpuart32_read(sport->port.membase + UARTBAUD);
1352 modem = lpuart32_read(sport->port.membase + UARTMODIR);
1353 /*
1354 * only support CS8 and CS7, and for CS7 must enable PE.
1355 * supported mode:
1356 * - (7,e/o,1)
1357 * - (8,n,1)
1358 * - (8,m/s,1)
1359 * - (8,e/o,1)
1360 */
1361 while ((termios->c_cflag & CSIZE) != CS8 &&
1362 (termios->c_cflag & CSIZE) != CS7) {
1363 termios->c_cflag &= ~CSIZE;
1364 termios->c_cflag |= old_csize;
1365 old_csize = CS8;
1366 }
1367
1368 if ((termios->c_cflag & CSIZE) == CS8 ||
1369 (termios->c_cflag & CSIZE) == CS7)
1370 ctrl = old_ctrl & ~UARTCTRL_M;
1371
1372 if (termios->c_cflag & CMSPAR) {
1373 if ((termios->c_cflag & CSIZE) != CS8) {
1374 termios->c_cflag &= ~CSIZE;
1375 termios->c_cflag |= CS8;
1376 }
1377 ctrl |= UARTCTRL_M;
1378 }
1379
1380 if (termios->c_cflag & CRTSCTS) {
1381 modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1382 } else {
1383 termios->c_cflag &= ~CRTSCTS;
1384 modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
1385 }
1386
1387 if (termios->c_cflag & CSTOPB)
1388 termios->c_cflag &= ~CSTOPB;
1389
1390 /* parity must be enabled when CS7 to match 8-bits format */
1391 if ((termios->c_cflag & CSIZE) == CS7)
1392 termios->c_cflag |= PARENB;
1393
1394 if ((termios->c_cflag & PARENB)) {
1395 if (termios->c_cflag & CMSPAR) {
1396 ctrl &= ~UARTCTRL_PE;
1397 ctrl |= UARTCTRL_M;
1398 } else {
1399 ctrl |= UARTCR1_PE;
1400 if ((termios->c_cflag & CSIZE) == CS8)
1401 ctrl |= UARTCTRL_M;
1402 if (termios->c_cflag & PARODD)
1403 ctrl |= UARTCTRL_PT;
1404 else
1405 ctrl &= ~UARTCTRL_PT;
1406 }
1407 } else {
1408 ctrl &= ~UARTCTRL_PE;
1409 }
1410
1411 /* ask the core to calculate the divisor */
1412 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 4);
1413
1414 spin_lock_irqsave(&sport->port.lock, flags);
1415
1416 sport->port.read_status_mask = 0;
1417 if (termios->c_iflag & INPCK)
1418 sport->port.read_status_mask |= (UARTSTAT_FE | UARTSTAT_PE);
1419 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
1420 sport->port.read_status_mask |= UARTSTAT_FE;
1421
1422 /* characters to ignore */
1423 sport->port.ignore_status_mask = 0;
1424 if (termios->c_iflag & IGNPAR)
1425 sport->port.ignore_status_mask |= UARTSTAT_PE;
1426 if (termios->c_iflag & IGNBRK) {
1427 sport->port.ignore_status_mask |= UARTSTAT_FE;
1428 /*
1429 * if we're ignoring parity and break indicators,
1430 * ignore overruns too (for real raw support).
1431 */
1432 if (termios->c_iflag & IGNPAR)
1433 sport->port.ignore_status_mask |= UARTSTAT_OR;
1434 }
1435
1436 /* update the per-port timeout */
1437 uart_update_timeout(port, termios->c_cflag, baud);
1438
1439 /* wait transmit engin complete */
1440 while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
1441 barrier();
1442
1443 /* disable transmit and receive */
1444 lpuart32_write(old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
1445 sport->port.membase + UARTCTRL);
1446
1447 sbr = sport->port.uartclk / (16 * baud);
1448 bd &= ~UARTBAUD_SBR_MASK;
1449 bd |= sbr & UARTBAUD_SBR_MASK;
1450 bd |= UARTBAUD_BOTHEDGE;
1451 bd &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);
1452 lpuart32_write(bd, sport->port.membase + UARTBAUD);
1453 lpuart32_write(modem, sport->port.membase + UARTMODIR);
1454 lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
1455 /* restore control register */
1456
1457 spin_unlock_irqrestore(&sport->port.lock, flags);
1458 }
1459
lpuart_type(struct uart_port * port)1460 static const char *lpuart_type(struct uart_port *port)
1461 {
1462 return "FSL_LPUART";
1463 }
1464
lpuart_release_port(struct uart_port * port)1465 static void lpuart_release_port(struct uart_port *port)
1466 {
1467 /* nothing to do */
1468 }
1469
lpuart_request_port(struct uart_port * port)1470 static int lpuart_request_port(struct uart_port *port)
1471 {
1472 return 0;
1473 }
1474
1475 /* configure/autoconfigure the port */
lpuart_config_port(struct uart_port * port,int flags)1476 static void lpuart_config_port(struct uart_port *port, int flags)
1477 {
1478 if (flags & UART_CONFIG_TYPE)
1479 port->type = PORT_LPUART;
1480 }
1481
lpuart_verify_port(struct uart_port * port,struct serial_struct * ser)1482 static int lpuart_verify_port(struct uart_port *port, struct serial_struct *ser)
1483 {
1484 int ret = 0;
1485
1486 if (ser->type != PORT_UNKNOWN && ser->type != PORT_LPUART)
1487 ret = -EINVAL;
1488 if (port->irq != ser->irq)
1489 ret = -EINVAL;
1490 if (ser->io_type != UPIO_MEM)
1491 ret = -EINVAL;
1492 if (port->uartclk / 16 != ser->baud_base)
1493 ret = -EINVAL;
1494 if (port->iobase != ser->port)
1495 ret = -EINVAL;
1496 if (ser->hub6 != 0)
1497 ret = -EINVAL;
1498 return ret;
1499 }
1500
1501 static struct uart_ops lpuart_pops = {
1502 .tx_empty = lpuart_tx_empty,
1503 .set_mctrl = lpuart_set_mctrl,
1504 .get_mctrl = lpuart_get_mctrl,
1505 .stop_tx = lpuart_stop_tx,
1506 .start_tx = lpuart_start_tx,
1507 .stop_rx = lpuart_stop_rx,
1508 .break_ctl = lpuart_break_ctl,
1509 .startup = lpuart_startup,
1510 .shutdown = lpuart_shutdown,
1511 .set_termios = lpuart_set_termios,
1512 .type = lpuart_type,
1513 .request_port = lpuart_request_port,
1514 .release_port = lpuart_release_port,
1515 .config_port = lpuart_config_port,
1516 .verify_port = lpuart_verify_port,
1517 .flush_buffer = lpuart_flush_buffer,
1518 };
1519
1520 static struct uart_ops lpuart32_pops = {
1521 .tx_empty = lpuart32_tx_empty,
1522 .set_mctrl = lpuart32_set_mctrl,
1523 .get_mctrl = lpuart32_get_mctrl,
1524 .stop_tx = lpuart32_stop_tx,
1525 .start_tx = lpuart32_start_tx,
1526 .stop_rx = lpuart32_stop_rx,
1527 .break_ctl = lpuart32_break_ctl,
1528 .startup = lpuart32_startup,
1529 .shutdown = lpuart32_shutdown,
1530 .set_termios = lpuart32_set_termios,
1531 .type = lpuart_type,
1532 .request_port = lpuart_request_port,
1533 .release_port = lpuart_release_port,
1534 .config_port = lpuart_config_port,
1535 .verify_port = lpuart_verify_port,
1536 .flush_buffer = lpuart_flush_buffer,
1537 };
1538
1539 static struct lpuart_port *lpuart_ports[UART_NR];
1540
1541 #ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
lpuart_console_putchar(struct uart_port * port,int ch)1542 static void lpuart_console_putchar(struct uart_port *port, int ch)
1543 {
1544 while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
1545 barrier();
1546
1547 writeb(ch, port->membase + UARTDR);
1548 }
1549
lpuart32_console_putchar(struct uart_port * port,int ch)1550 static void lpuart32_console_putchar(struct uart_port *port, int ch)
1551 {
1552 while (!(lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE))
1553 barrier();
1554
1555 lpuart32_write(ch, port->membase + UARTDATA);
1556 }
1557
1558 static void
lpuart_console_write(struct console * co,const char * s,unsigned int count)1559 lpuart_console_write(struct console *co, const char *s, unsigned int count)
1560 {
1561 struct lpuart_port *sport = lpuart_ports[co->index];
1562 unsigned char old_cr2, cr2;
1563
1564 /* first save CR2 and then disable interrupts */
1565 cr2 = old_cr2 = readb(sport->port.membase + UARTCR2);
1566 cr2 |= (UARTCR2_TE | UARTCR2_RE);
1567 cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
1568 writeb(cr2, sport->port.membase + UARTCR2);
1569
1570 uart_console_write(&sport->port, s, count, lpuart_console_putchar);
1571
1572 /* wait for transmitter finish complete and restore CR2 */
1573 while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
1574 barrier();
1575
1576 writeb(old_cr2, sport->port.membase + UARTCR2);
1577 }
1578
1579 static void
lpuart32_console_write(struct console * co,const char * s,unsigned int count)1580 lpuart32_console_write(struct console *co, const char *s, unsigned int count)
1581 {
1582 struct lpuart_port *sport = lpuart_ports[co->index];
1583 unsigned long old_cr, cr;
1584
1585 /* first save CR2 and then disable interrupts */
1586 cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL);
1587 cr |= (UARTCTRL_TE | UARTCTRL_RE);
1588 cr &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
1589 lpuart32_write(cr, sport->port.membase + UARTCTRL);
1590
1591 uart_console_write(&sport->port, s, count, lpuart32_console_putchar);
1592
1593 /* wait for transmitter finish complete and restore CR2 */
1594 while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
1595 barrier();
1596
1597 lpuart32_write(old_cr, sport->port.membase + UARTCTRL);
1598 }
1599
1600 /*
1601 * if the port was already initialised (eg, by a boot loader),
1602 * try to determine the current setup.
1603 */
1604 static void __init
lpuart_console_get_options(struct lpuart_port * sport,int * baud,int * parity,int * bits)1605 lpuart_console_get_options(struct lpuart_port *sport, int *baud,
1606 int *parity, int *bits)
1607 {
1608 unsigned char cr, bdh, bdl, brfa;
1609 unsigned int sbr, uartclk, baud_raw;
1610
1611 cr = readb(sport->port.membase + UARTCR2);
1612 cr &= UARTCR2_TE | UARTCR2_RE;
1613 if (!cr)
1614 return;
1615
1616 /* ok, the port was enabled */
1617
1618 cr = readb(sport->port.membase + UARTCR1);
1619
1620 *parity = 'n';
1621 if (cr & UARTCR1_PE) {
1622 if (cr & UARTCR1_PT)
1623 *parity = 'o';
1624 else
1625 *parity = 'e';
1626 }
1627
1628 if (cr & UARTCR1_M)
1629 *bits = 9;
1630 else
1631 *bits = 8;
1632
1633 bdh = readb(sport->port.membase + UARTBDH);
1634 bdh &= UARTBDH_SBR_MASK;
1635 bdl = readb(sport->port.membase + UARTBDL);
1636 sbr = bdh;
1637 sbr <<= 8;
1638 sbr |= bdl;
1639 brfa = readb(sport->port.membase + UARTCR4);
1640 brfa &= UARTCR4_BRFA_MASK;
1641
1642 uartclk = clk_get_rate(sport->clk);
1643 /*
1644 * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
1645 */
1646 baud_raw = uartclk / (16 * (sbr + brfa / 32));
1647
1648 if (*baud != baud_raw)
1649 printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
1650 "from %d to %d\n", baud_raw, *baud);
1651 }
1652
1653 static void __init
lpuart32_console_get_options(struct lpuart_port * sport,int * baud,int * parity,int * bits)1654 lpuart32_console_get_options(struct lpuart_port *sport, int *baud,
1655 int *parity, int *bits)
1656 {
1657 unsigned long cr, bd;
1658 unsigned int sbr, uartclk, baud_raw;
1659
1660 cr = lpuart32_read(sport->port.membase + UARTCTRL);
1661 cr &= UARTCTRL_TE | UARTCTRL_RE;
1662 if (!cr)
1663 return;
1664
1665 /* ok, the port was enabled */
1666
1667 cr = lpuart32_read(sport->port.membase + UARTCTRL);
1668
1669 *parity = 'n';
1670 if (cr & UARTCTRL_PE) {
1671 if (cr & UARTCTRL_PT)
1672 *parity = 'o';
1673 else
1674 *parity = 'e';
1675 }
1676
1677 if (cr & UARTCTRL_M)
1678 *bits = 9;
1679 else
1680 *bits = 8;
1681
1682 bd = lpuart32_read(sport->port.membase + UARTBAUD);
1683 bd &= UARTBAUD_SBR_MASK;
1684 if (!bd)
1685 return;
1686
1687 sbr = bd;
1688 uartclk = clk_get_rate(sport->clk);
1689 /*
1690 * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
1691 */
1692 baud_raw = uartclk / (16 * sbr);
1693
1694 if (*baud != baud_raw)
1695 printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
1696 "from %d to %d\n", baud_raw, *baud);
1697 }
1698
lpuart_console_setup(struct console * co,char * options)1699 static int __init lpuart_console_setup(struct console *co, char *options)
1700 {
1701 struct lpuart_port *sport;
1702 int baud = 115200;
1703 int bits = 8;
1704 int parity = 'n';
1705 int flow = 'n';
1706
1707 /*
1708 * check whether an invalid uart number has been specified, and
1709 * if so, search for the first available port that does have
1710 * console support.
1711 */
1712 if (co->index == -1 || co->index >= ARRAY_SIZE(lpuart_ports))
1713 co->index = 0;
1714
1715 sport = lpuart_ports[co->index];
1716 if (sport == NULL)
1717 return -ENODEV;
1718
1719 if (options)
1720 uart_parse_options(options, &baud, &parity, &bits, &flow);
1721 else
1722 if (sport->lpuart32)
1723 lpuart32_console_get_options(sport, &baud, &parity, &bits);
1724 else
1725 lpuart_console_get_options(sport, &baud, &parity, &bits);
1726
1727 if (sport->lpuart32)
1728 lpuart32_setup_watermark(sport);
1729 else
1730 lpuart_setup_watermark(sport);
1731
1732 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
1733 }
1734
1735 static struct uart_driver lpuart_reg;
1736 static struct console lpuart_console = {
1737 .name = DEV_NAME,
1738 .write = lpuart_console_write,
1739 .device = uart_console_device,
1740 .setup = lpuart_console_setup,
1741 .flags = CON_PRINTBUFFER,
1742 .index = -1,
1743 .data = &lpuart_reg,
1744 };
1745
1746 static struct console lpuart32_console = {
1747 .name = DEV_NAME,
1748 .write = lpuart32_console_write,
1749 .device = uart_console_device,
1750 .setup = lpuart_console_setup,
1751 .flags = CON_PRINTBUFFER,
1752 .index = -1,
1753 .data = &lpuart_reg,
1754 };
1755
lpuart_early_write(struct console * con,const char * s,unsigned n)1756 static void lpuart_early_write(struct console *con, const char *s, unsigned n)
1757 {
1758 struct earlycon_device *dev = con->data;
1759
1760 uart_console_write(&dev->port, s, n, lpuart_console_putchar);
1761 }
1762
lpuart32_early_write(struct console * con,const char * s,unsigned n)1763 static void lpuart32_early_write(struct console *con, const char *s, unsigned n)
1764 {
1765 struct earlycon_device *dev = con->data;
1766
1767 uart_console_write(&dev->port, s, n, lpuart32_console_putchar);
1768 }
1769
lpuart_early_console_setup(struct earlycon_device * device,const char * opt)1770 static int __init lpuart_early_console_setup(struct earlycon_device *device,
1771 const char *opt)
1772 {
1773 if (!device->port.membase)
1774 return -ENODEV;
1775
1776 device->con->write = lpuart_early_write;
1777 return 0;
1778 }
1779
lpuart32_early_console_setup(struct earlycon_device * device,const char * opt)1780 static int __init lpuart32_early_console_setup(struct earlycon_device *device,
1781 const char *opt)
1782 {
1783 if (!device->port.membase)
1784 return -ENODEV;
1785
1786 device->con->write = lpuart32_early_write;
1787 return 0;
1788 }
1789
1790 OF_EARLYCON_DECLARE(lpuart, "fsl,vf610-lpuart", lpuart_early_console_setup);
1791 OF_EARLYCON_DECLARE(lpuart32, "fsl,ls1021a-lpuart", lpuart32_early_console_setup);
1792 EARLYCON_DECLARE(lpuart, lpuart_early_console_setup);
1793 EARLYCON_DECLARE(lpuart32, lpuart32_early_console_setup);
1794
1795 #define LPUART_CONSOLE (&lpuart_console)
1796 #define LPUART32_CONSOLE (&lpuart32_console)
1797 #else
1798 #define LPUART_CONSOLE NULL
1799 #define LPUART32_CONSOLE NULL
1800 #endif
1801
1802 static struct uart_driver lpuart_reg = {
1803 .owner = THIS_MODULE,
1804 .driver_name = DRIVER_NAME,
1805 .dev_name = DEV_NAME,
1806 .nr = ARRAY_SIZE(lpuart_ports),
1807 .cons = LPUART_CONSOLE,
1808 };
1809
lpuart_probe(struct platform_device * pdev)1810 static int lpuart_probe(struct platform_device *pdev)
1811 {
1812 struct device_node *np = pdev->dev.of_node;
1813 struct lpuart_port *sport;
1814 struct resource *res;
1815 int ret;
1816
1817 sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
1818 if (!sport)
1819 return -ENOMEM;
1820
1821 pdev->dev.coherent_dma_mask = 0;
1822
1823 ret = of_alias_get_id(np, "serial");
1824 if (ret < 0) {
1825 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
1826 return ret;
1827 }
1828 if (ret >= ARRAY_SIZE(lpuart_ports)) {
1829 dev_err(&pdev->dev, "serial%d out of range\n", ret);
1830 return -EINVAL;
1831 }
1832 sport->port.line = ret;
1833 sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
1834
1835 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1836 sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
1837 if (IS_ERR(sport->port.membase))
1838 return PTR_ERR(sport->port.membase);
1839
1840 sport->port.mapbase = res->start;
1841 sport->port.dev = &pdev->dev;
1842 sport->port.type = PORT_LPUART;
1843 sport->port.iotype = UPIO_MEM;
1844 sport->port.irq = platform_get_irq(pdev, 0);
1845 if (sport->lpuart32)
1846 sport->port.ops = &lpuart32_pops;
1847 else
1848 sport->port.ops = &lpuart_pops;
1849 sport->port.flags = UPF_BOOT_AUTOCONF;
1850
1851 sport->clk = devm_clk_get(&pdev->dev, "ipg");
1852 if (IS_ERR(sport->clk)) {
1853 ret = PTR_ERR(sport->clk);
1854 dev_err(&pdev->dev, "failed to get uart clk: %d\n", ret);
1855 return ret;
1856 }
1857
1858 ret = clk_prepare_enable(sport->clk);
1859 if (ret) {
1860 dev_err(&pdev->dev, "failed to enable uart clk: %d\n", ret);
1861 return ret;
1862 }
1863
1864 sport->port.uartclk = clk_get_rate(sport->clk);
1865
1866 lpuart_ports[sport->port.line] = sport;
1867
1868 platform_set_drvdata(pdev, &sport->port);
1869
1870 if (sport->lpuart32)
1871 lpuart_reg.cons = LPUART32_CONSOLE;
1872 else
1873 lpuart_reg.cons = LPUART_CONSOLE;
1874
1875 ret = uart_add_one_port(&lpuart_reg, &sport->port);
1876 if (ret) {
1877 clk_disable_unprepare(sport->clk);
1878 return ret;
1879 }
1880
1881 sport->dma_tx_chan = dma_request_slave_channel(sport->port.dev, "tx");
1882 if (!sport->dma_tx_chan)
1883 dev_info(sport->port.dev, "DMA tx channel request failed, "
1884 "operating without tx DMA\n");
1885
1886 sport->dma_rx_chan = dma_request_slave_channel(sport->port.dev, "rx");
1887 if (!sport->dma_rx_chan)
1888 dev_info(sport->port.dev, "DMA rx channel request failed, "
1889 "operating without rx DMA\n");
1890
1891 return 0;
1892 }
1893
lpuart_remove(struct platform_device * pdev)1894 static int lpuart_remove(struct platform_device *pdev)
1895 {
1896 struct lpuart_port *sport = platform_get_drvdata(pdev);
1897
1898 uart_remove_one_port(&lpuart_reg, &sport->port);
1899
1900 clk_disable_unprepare(sport->clk);
1901
1902 if (sport->dma_tx_chan)
1903 dma_release_channel(sport->dma_tx_chan);
1904
1905 if (sport->dma_rx_chan)
1906 dma_release_channel(sport->dma_rx_chan);
1907
1908 return 0;
1909 }
1910
1911 #ifdef CONFIG_PM_SLEEP
lpuart_suspend(struct device * dev)1912 static int lpuart_suspend(struct device *dev)
1913 {
1914 struct lpuart_port *sport = dev_get_drvdata(dev);
1915 unsigned long temp;
1916
1917 if (sport->lpuart32) {
1918 /* disable Rx/Tx and interrupts */
1919 temp = lpuart32_read(sport->port.membase + UARTCTRL);
1920 temp &= ~(UARTCTRL_TE | UARTCTRL_TIE | UARTCTRL_TCIE);
1921 lpuart32_write(temp, sport->port.membase + UARTCTRL);
1922 } else {
1923 /* disable Rx/Tx and interrupts */
1924 temp = readb(sport->port.membase + UARTCR2);
1925 temp &= ~(UARTCR2_TE | UARTCR2_TIE | UARTCR2_TCIE);
1926 writeb(temp, sport->port.membase + UARTCR2);
1927 }
1928
1929 uart_suspend_port(&lpuart_reg, &sport->port);
1930
1931 return 0;
1932 }
1933
lpuart_resume(struct device * dev)1934 static int lpuart_resume(struct device *dev)
1935 {
1936 struct lpuart_port *sport = dev_get_drvdata(dev);
1937 unsigned long temp;
1938
1939 if (sport->lpuart32) {
1940 lpuart32_setup_watermark(sport);
1941 temp = lpuart32_read(sport->port.membase + UARTCTRL);
1942 temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE |
1943 UARTCTRL_TE | UARTCTRL_ILIE);
1944 lpuart32_write(temp, sport->port.membase + UARTCTRL);
1945 } else {
1946 lpuart_setup_watermark(sport);
1947 temp = readb(sport->port.membase + UARTCR2);
1948 temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE);
1949 writeb(temp, sport->port.membase + UARTCR2);
1950 }
1951
1952 uart_resume_port(&lpuart_reg, &sport->port);
1953
1954 return 0;
1955 }
1956 #endif
1957
1958 static SIMPLE_DEV_PM_OPS(lpuart_pm_ops, lpuart_suspend, lpuart_resume);
1959
1960 static struct platform_driver lpuart_driver = {
1961 .probe = lpuart_probe,
1962 .remove = lpuart_remove,
1963 .driver = {
1964 .name = "fsl-lpuart",
1965 .of_match_table = lpuart_dt_ids,
1966 .pm = &lpuart_pm_ops,
1967 },
1968 };
1969
lpuart_serial_init(void)1970 static int __init lpuart_serial_init(void)
1971 {
1972 int ret = uart_register_driver(&lpuart_reg);
1973
1974 if (ret)
1975 return ret;
1976
1977 ret = platform_driver_register(&lpuart_driver);
1978 if (ret)
1979 uart_unregister_driver(&lpuart_reg);
1980
1981 return ret;
1982 }
1983
lpuart_serial_exit(void)1984 static void __exit lpuart_serial_exit(void)
1985 {
1986 platform_driver_unregister(&lpuart_driver);
1987 uart_unregister_driver(&lpuart_reg);
1988 }
1989
1990 module_init(lpuart_serial_init);
1991 module_exit(lpuart_serial_exit);
1992
1993 MODULE_DESCRIPTION("Freescale lpuart serial port driver");
1994 MODULE_LICENSE("GPL v2");
1995