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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / tty / serial / imx.c
1 /*
2 * Driver for Motorola IMX serial ports
3 *
4 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
5 *
6 * Author: Sascha Hauer <sascha@saschahauer.de>
7 * Copyright (C) 2004 Pengutronix
8 *
9 * Copyright (C) 2009 emlix GmbH
10 * Author: Fabian Godehardt (added IrDA support for iMX)
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * [29-Mar-2005] Mike Lee
27 * Added hardware handshake
28 */
29
30 #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
31 #define SUPPORT_SYSRQ
32 #endif
33
34 #include <linux/module.h>
35 #include <linux/ioport.h>
36 #include <linux/init.h>
37 #include <linux/console.h>
38 #include <linux/sysrq.h>
39 #include <linux/platform_device.h>
40 #include <linux/tty.h>
41 #include <linux/tty_flip.h>
42 #include <linux/serial_core.h>
43 #include <linux/serial.h>
44 #include <linux/clk.h>
45 #include <linux/delay.h>
46 #include <linux/rational.h>
47 #include <linux/slab.h>
48 #include <linux/of.h>
49 #include <linux/of_device.h>
50 #include <linux/pinctrl/consumer.h>
51
52 #include <asm/io.h>
53 #include <asm/irq.h>
54 #include <mach/imx-uart.h>
55
56 /* Register definitions */
57 #define URXD0 0x0 /* Receiver Register */
58 #define URTX0 0x40 /* Transmitter Register */
59 #define UCR1 0x80 /* Control Register 1 */
60 #define UCR2 0x84 /* Control Register 2 */
61 #define UCR3 0x88 /* Control Register 3 */
62 #define UCR4 0x8c /* Control Register 4 */
63 #define UFCR 0x90 /* FIFO Control Register */
64 #define USR1 0x94 /* Status Register 1 */
65 #define USR2 0x98 /* Status Register 2 */
66 #define UESC 0x9c /* Escape Character Register */
67 #define UTIM 0xa0 /* Escape Timer Register */
68 #define UBIR 0xa4 /* BRM Incremental Register */
69 #define UBMR 0xa8 /* BRM Modulator Register */
70 #define UBRC 0xac /* Baud Rate Count Register */
71 #define IMX21_ONEMS 0xb0 /* One Millisecond register */
72 #define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */
73 #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/
74
75 /* UART Control Register Bit Fields.*/
76 #define URXD_CHARRDY (1<<15)
77 #define URXD_ERR (1<<14)
78 #define URXD_OVRRUN (1<<13)
79 #define URXD_FRMERR (1<<12)
80 #define URXD_BRK (1<<11)
81 #define URXD_PRERR (1<<10)
82 #define UCR1_ADEN (1<<15) /* Auto detect interrupt */
83 #define UCR1_ADBR (1<<14) /* Auto detect baud rate */
84 #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
85 #define UCR1_IDEN (1<<12) /* Idle condition interrupt */
86 #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
87 #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
88 #define UCR1_IREN (1<<7) /* Infrared interface enable */
89 #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
90 #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
91 #define UCR1_SNDBRK (1<<4) /* Send break */
92 #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
93 #define IMX1_UCR1_UARTCLKEN (1<<2) /* UART clock enabled, i.mx1 only */
94 #define UCR1_DOZE (1<<1) /* Doze */
95 #define UCR1_UARTEN (1<<0) /* UART enabled */
96 #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
97 #define UCR2_IRTS (1<<14) /* Ignore RTS pin */
98 #define UCR2_CTSC (1<<13) /* CTS pin control */
99 #define UCR2_CTS (1<<12) /* Clear to send */
100 #define UCR2_ESCEN (1<<11) /* Escape enable */
101 #define UCR2_PREN (1<<8) /* Parity enable */
102 #define UCR2_PROE (1<<7) /* Parity odd/even */
103 #define UCR2_STPB (1<<6) /* Stop */
104 #define UCR2_WS (1<<5) /* Word size */
105 #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
106 #define UCR2_ATEN (1<<3) /* Aging Timer Enable */
107 #define UCR2_TXEN (1<<2) /* Transmitter enabled */
108 #define UCR2_RXEN (1<<1) /* Receiver enabled */
109 #define UCR2_SRST (1<<0) /* SW reset */
110 #define UCR3_DTREN (1<<13) /* DTR interrupt enable */
111 #define UCR3_PARERREN (1<<12) /* Parity enable */
112 #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
113 #define UCR3_DSR (1<<10) /* Data set ready */
114 #define UCR3_DCD (1<<9) /* Data carrier detect */
115 #define UCR3_RI (1<<8) /* Ring indicator */
116 #define UCR3_TIMEOUTEN (1<<7) /* Timeout interrupt enable */
117 #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
118 #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
119 #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
120 #define IMX21_UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select */
121 #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
122 #define UCR3_BPEN (1<<0) /* Preset registers enable */
123 #define UCR4_CTSTL_SHF 10 /* CTS trigger level shift */
124 #define UCR4_CTSTL_MASK 0x3F /* CTS trigger is 6 bits wide */
125 #define UCR4_INVR (1<<9) /* Inverted infrared reception */
126 #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
127 #define UCR4_WKEN (1<<7) /* Wake interrupt enable */
128 #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
129 #define UCR4_IRSC (1<<5) /* IR special case */
130 #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
131 #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
132 #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
133 #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
134 #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
135 #define UFCR_DCEDTE (1<<6) /* DCE/DTE mode select */
136 #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
137 #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7)
138 #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
139 #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
140 #define USR1_RTSS (1<<14) /* RTS pin status */
141 #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
142 #define USR1_RTSD (1<<12) /* RTS delta */
143 #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
144 #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
145 #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
146 #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
147 #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
148 #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
149 #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
150 #define USR2_ADET (1<<15) /* Auto baud rate detect complete */
151 #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
152 #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
153 #define USR2_IDLE (1<<12) /* Idle condition */
154 #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
155 #define USR2_WAKE (1<<7) /* Wake */
156 #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
157 #define USR2_TXDC (1<<3) /* Transmitter complete */
158 #define USR2_BRCD (1<<2) /* Break condition */
159 #define USR2_ORE (1<<1) /* Overrun error */
160 #define USR2_RDR (1<<0) /* Recv data ready */
161 #define UTS_FRCPERR (1<<13) /* Force parity error */
162 #define UTS_LOOP (1<<12) /* Loop tx and rx */
163 #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
164 #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
165 #define UTS_TXFULL (1<<4) /* TxFIFO full */
166 #define UTS_RXFULL (1<<3) /* RxFIFO full */
167 #define UTS_SOFTRST (1<<0) /* Software reset */
168
169 /* We've been assigned a range on the "Low-density serial ports" major */
170 #define SERIAL_IMX_MAJOR 207
171 #define MINOR_START 16
172 #define DEV_NAME "ttymxc"
173
174 /*
175 * This determines how often we check the modem status signals
176 * for any change. They generally aren't connected to an IRQ
177 * so we have to poll them. We also check immediately before
178 * filling the TX fifo incase CTS has been dropped.
179 */
180 #define MCTRL_TIMEOUT (250*HZ/1000)
181
182 #define DRIVER_NAME "IMX-uart"
183
184 #define UART_NR 8
185
186 /* i.mx21 type uart runs on all i.mx except i.mx1 */
187 enum imx_uart_type {
188 IMX1_UART,
189 IMX21_UART,
190 };
191
192 /* device type dependent stuff */
193 struct imx_uart_data {
194 unsigned uts_reg;
195 enum imx_uart_type devtype;
196 };
197
198 struct imx_port {
199 struct uart_port port;
200 struct timer_list timer;
201 unsigned int old_status;
202 int txirq,rxirq,rtsirq;
203 unsigned int have_rtscts:1;
204 unsigned int use_irda:1;
205 unsigned int irda_inv_rx:1;
206 unsigned int irda_inv_tx:1;
207 unsigned short trcv_delay; /* transceiver delay */
208 struct clk *clk_ipg;
209 struct clk *clk_per;
210 struct imx_uart_data *devdata;
211 };
212
213 struct imx_port_ucrs {
214 unsigned int ucr1;
215 unsigned int ucr2;
216 unsigned int ucr3;
217 };
218
219 #ifdef CONFIG_IRDA
220 #define USE_IRDA(sport) ((sport)->use_irda)
221 #else
222 #define USE_IRDA(sport) (0)
223 #endif
224
225 static struct imx_uart_data imx_uart_devdata[] = {
226 [IMX1_UART] = {
227 .uts_reg = IMX1_UTS,
228 .devtype = IMX1_UART,
229 },
230 [IMX21_UART] = {
231 .uts_reg = IMX21_UTS,
232 .devtype = IMX21_UART,
233 },
234 };
235
236 static struct platform_device_id imx_uart_devtype[] = {
237 {
238 .name = "imx1-uart",
239 .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART],
240 }, {
241 .name = "imx21-uart",
242 .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX21_UART],
243 }, {
244 /* sentinel */
245 }
246 };
247 MODULE_DEVICE_TABLE(platform, imx_uart_devtype);
248
249 static struct of_device_id imx_uart_dt_ids[] = {
250 { .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], },
251 { .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], },
252 { /* sentinel */ }
253 };
254 MODULE_DEVICE_TABLE(of, imx_uart_dt_ids);
255
256 static inline unsigned uts_reg(struct imx_port *sport)
257 {
258 return sport->devdata->uts_reg;
259 }
260
261 static inline int is_imx1_uart(struct imx_port *sport)
262 {
263 return sport->devdata->devtype == IMX1_UART;
264 }
265
266 static inline int is_imx21_uart(struct imx_port *sport)
267 {
268 return sport->devdata->devtype == IMX21_UART;
269 }
270
271 /*
272 * Save and restore functions for UCR1, UCR2 and UCR3 registers
273 */
274 static void imx_port_ucrs_save(struct uart_port *port,
275 struct imx_port_ucrs *ucr)
276 {
277 /* save control registers */
278 ucr->ucr1 = readl(port->membase + UCR1);
279 ucr->ucr2 = readl(port->membase + UCR2);
280 ucr->ucr3 = readl(port->membase + UCR3);
281 }
282
283 static void imx_port_ucrs_restore(struct uart_port *port,
284 struct imx_port_ucrs *ucr)
285 {
286 /* restore control registers */
287 writel(ucr->ucr1, port->membase + UCR1);
288 writel(ucr->ucr2, port->membase + UCR2);
289 writel(ucr->ucr3, port->membase + UCR3);
290 }
291
292 /*
293 * Handle any change of modem status signal since we were last called.
294 */
295 static void imx_mctrl_check(struct imx_port *sport)
296 {
297 unsigned int status, changed;
298
299 status = sport->port.ops->get_mctrl(&sport->port);
300 changed = status ^ sport->old_status;
301
302 if (changed == 0)
303 return;
304
305 sport->old_status = status;
306
307 if (changed & TIOCM_RI)
308 sport->port.icount.rng++;
309 if (changed & TIOCM_DSR)
310 sport->port.icount.dsr++;
311 if (changed & TIOCM_CAR)
312 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
313 if (changed & TIOCM_CTS)
314 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
315
316 wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
317 }
318
319 /*
320 * This is our per-port timeout handler, for checking the
321 * modem status signals.
322 */
323 static void imx_timeout(unsigned long data)
324 {
325 struct imx_port *sport = (struct imx_port *)data;
326 unsigned long flags;
327
328 if (sport->port.state) {
329 spin_lock_irqsave(&sport->port.lock, flags);
330 imx_mctrl_check(sport);
331 spin_unlock_irqrestore(&sport->port.lock, flags);
332
333 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
334 }
335 }
336
337 /*
338 * interrupts disabled on entry
339 */
340 static void imx_stop_tx(struct uart_port *port)
341 {
342 struct imx_port *sport = (struct imx_port *)port;
343 unsigned long temp;
344
345 if (USE_IRDA(sport)) {
346 /* half duplex - wait for end of transmission */
347 int n = 256;
348 while ((--n > 0) &&
349 !(readl(sport->port.membase + USR2) & USR2_TXDC)) {
350 udelay(5);
351 barrier();
352 }
353 /*
354 * irda transceiver - wait a bit more to avoid
355 * cutoff, hardware dependent
356 */
357 udelay(sport->trcv_delay);
358
359 /*
360 * half duplex - reactivate receive mode,
361 * flush receive pipe echo crap
362 */
363 if (readl(sport->port.membase + USR2) & USR2_TXDC) {
364 temp = readl(sport->port.membase + UCR1);
365 temp &= ~(UCR1_TXMPTYEN | UCR1_TRDYEN);
366 writel(temp, sport->port.membase + UCR1);
367
368 temp = readl(sport->port.membase + UCR4);
369 temp &= ~(UCR4_TCEN);
370 writel(temp, sport->port.membase + UCR4);
371
372 while (readl(sport->port.membase + URXD0) &
373 URXD_CHARRDY)
374 barrier();
375
376 temp = readl(sport->port.membase + UCR1);
377 temp |= UCR1_RRDYEN;
378 writel(temp, sport->port.membase + UCR1);
379
380 temp = readl(sport->port.membase + UCR4);
381 temp |= UCR4_DREN;
382 writel(temp, sport->port.membase + UCR4);
383 }
384 return;
385 }
386
387 temp = readl(sport->port.membase + UCR1);
388 writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1);
389 }
390
391 /*
392 * interrupts disabled on entry
393 */
394 static void imx_stop_rx(struct uart_port *port)
395 {
396 struct imx_port *sport = (struct imx_port *)port;
397 unsigned long temp;
398
399 temp = readl(sport->port.membase + UCR2);
400 writel(temp &~ UCR2_RXEN, sport->port.membase + UCR2);
401 }
402
403 /*
404 * Set the modem control timer to fire immediately.
405 */
406 static void imx_enable_ms(struct uart_port *port)
407 {
408 struct imx_port *sport = (struct imx_port *)port;
409
410 mod_timer(&sport->timer, jiffies);
411 }
412
413 static inline void imx_transmit_buffer(struct imx_port *sport)
414 {
415 struct circ_buf *xmit = &sport->port.state->xmit;
416
417 while (!uart_circ_empty(xmit) &&
418 !(readl(sport->port.membase + uts_reg(sport))
419 & UTS_TXFULL)) {
420 /* send xmit->buf[xmit->tail]
421 * out the port here */
422 writel(xmit->buf[xmit->tail], sport->port.membase + URTX0);
423 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
424 sport->port.icount.tx++;
425 }
426
427 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
428 uart_write_wakeup(&sport->port);
429
430 if (uart_circ_empty(xmit))
431 imx_stop_tx(&sport->port);
432 }
433
434 /*
435 * interrupts disabled on entry
436 */
437 static void imx_start_tx(struct uart_port *port)
438 {
439 struct imx_port *sport = (struct imx_port *)port;
440 unsigned long temp;
441
442 if (USE_IRDA(sport)) {
443 /* half duplex in IrDA mode; have to disable receive mode */
444 temp = readl(sport->port.membase + UCR4);
445 temp &= ~(UCR4_DREN);
446 writel(temp, sport->port.membase + UCR4);
447
448 temp = readl(sport->port.membase + UCR1);
449 temp &= ~(UCR1_RRDYEN);
450 writel(temp, sport->port.membase + UCR1);
451 }
452
453 temp = readl(sport->port.membase + UCR1);
454 writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
455
456 if (USE_IRDA(sport)) {
457 temp = readl(sport->port.membase + UCR1);
458 temp |= UCR1_TRDYEN;
459 writel(temp, sport->port.membase + UCR1);
460
461 temp = readl(sport->port.membase + UCR4);
462 temp |= UCR4_TCEN;
463 writel(temp, sport->port.membase + UCR4);
464 }
465
466 if (readl(sport->port.membase + uts_reg(sport)) & UTS_TXEMPTY)
467 imx_transmit_buffer(sport);
468 }
469
470 static irqreturn_t imx_rtsint(int irq, void *dev_id)
471 {
472 struct imx_port *sport = dev_id;
473 unsigned int val;
474 unsigned long flags;
475
476 spin_lock_irqsave(&sport->port.lock, flags);
477
478 writel(USR1_RTSD, sport->port.membase + USR1);
479 val = readl(sport->port.membase + USR1) & USR1_RTSS;
480 uart_handle_cts_change(&sport->port, !!val);
481 wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
482
483 spin_unlock_irqrestore(&sport->port.lock, flags);
484 return IRQ_HANDLED;
485 }
486
487 static irqreturn_t imx_txint(int irq, void *dev_id)
488 {
489 struct imx_port *sport = dev_id;
490 struct circ_buf *xmit = &sport->port.state->xmit;
491 unsigned long flags;
492
493 spin_lock_irqsave(&sport->port.lock,flags);
494 if (sport->port.x_char)
495 {
496 /* Send next char */
497 writel(sport->port.x_char, sport->port.membase + URTX0);
498 goto out;
499 }
500
501 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
502 imx_stop_tx(&sport->port);
503 goto out;
504 }
505
506 imx_transmit_buffer(sport);
507
508 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
509 uart_write_wakeup(&sport->port);
510
511 out:
512 spin_unlock_irqrestore(&sport->port.lock,flags);
513 return IRQ_HANDLED;
514 }
515
516 static irqreturn_t imx_rxint(int irq, void *dev_id)
517 {
518 struct imx_port *sport = dev_id;
519 unsigned int rx,flg,ignored = 0;
520 struct tty_struct *tty = sport->port.state->port.tty;
521 unsigned long flags, temp;
522
523 spin_lock_irqsave(&sport->port.lock,flags);
524
525 while (readl(sport->port.membase + USR2) & USR2_RDR) {
526 flg = TTY_NORMAL;
527 sport->port.icount.rx++;
528
529 rx = readl(sport->port.membase + URXD0);
530
531 temp = readl(sport->port.membase + USR2);
532 if (temp & USR2_BRCD) {
533 writel(USR2_BRCD, sport->port.membase + USR2);
534 if (uart_handle_break(&sport->port))
535 continue;
536 }
537
538 if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
539 continue;
540
541 if (unlikely(rx & URXD_ERR)) {
542 if (rx & URXD_BRK)
543 sport->port.icount.brk++;
544 else if (rx & URXD_PRERR)
545 sport->port.icount.parity++;
546 else if (rx & URXD_FRMERR)
547 sport->port.icount.frame++;
548 if (rx & URXD_OVRRUN)
549 sport->port.icount.overrun++;
550
551 if (rx & sport->port.ignore_status_mask) {
552 if (++ignored > 100)
553 goto out;
554 continue;
555 }
556
557 rx &= sport->port.read_status_mask;
558
559 if (rx & URXD_BRK)
560 flg = TTY_BREAK;
561 else if (rx & URXD_PRERR)
562 flg = TTY_PARITY;
563 else if (rx & URXD_FRMERR)
564 flg = TTY_FRAME;
565 if (rx & URXD_OVRRUN)
566 flg = TTY_OVERRUN;
567
568 #ifdef SUPPORT_SYSRQ
569 sport->port.sysrq = 0;
570 #endif
571 }
572
573 tty_insert_flip_char(tty, rx, flg);
574 }
575
576 out:
577 spin_unlock_irqrestore(&sport->port.lock,flags);
578 tty_flip_buffer_push(tty);
579 return IRQ_HANDLED;
580 }
581
582 static irqreturn_t imx_int(int irq, void *dev_id)
583 {
584 struct imx_port *sport = dev_id;
585 unsigned int sts;
586
587 sts = readl(sport->port.membase + USR1);
588
589 if (sts & USR1_RRDY)
590 imx_rxint(irq, dev_id);
591
592 if (sts & USR1_TRDY &&
593 readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN)
594 imx_txint(irq, dev_id);
595
596 if (sts & USR1_RTSD)
597 imx_rtsint(irq, dev_id);
598
599 if (sts & USR1_AWAKE)
600 writel(USR1_AWAKE, sport->port.membase + USR1);
601
602 return IRQ_HANDLED;
603 }
604
605 /*
606 * Return TIOCSER_TEMT when transmitter is not busy.
607 */
608 static unsigned int imx_tx_empty(struct uart_port *port)
609 {
610 struct imx_port *sport = (struct imx_port *)port;
611
612 return (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0;
613 }
614
615 /*
616 * We have a modem side uart, so the meanings of RTS and CTS are inverted.
617 */
618 static unsigned int imx_get_mctrl(struct uart_port *port)
619 {
620 struct imx_port *sport = (struct imx_port *)port;
621 unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
622
623 if (readl(sport->port.membase + USR1) & USR1_RTSS)
624 tmp |= TIOCM_CTS;
625
626 if (readl(sport->port.membase + UCR2) & UCR2_CTS)
627 tmp |= TIOCM_RTS;
628
629 return tmp;
630 }
631
632 static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
633 {
634 struct imx_port *sport = (struct imx_port *)port;
635 unsigned long temp;
636
637 temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;
638
639 if (mctrl & TIOCM_RTS)
640 temp |= UCR2_CTS;
641
642 writel(temp, sport->port.membase + UCR2);
643 }
644
645 /*
646 * Interrupts always disabled.
647 */
648 static void imx_break_ctl(struct uart_port *port, int break_state)
649 {
650 struct imx_port *sport = (struct imx_port *)port;
651 unsigned long flags, temp;
652
653 spin_lock_irqsave(&sport->port.lock, flags);
654
655 temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK;
656
657 if ( break_state != 0 )
658 temp |= UCR1_SNDBRK;
659
660 writel(temp, sport->port.membase + UCR1);
661
662 spin_unlock_irqrestore(&sport->port.lock, flags);
663 }
664
665 #define TXTL 2 /* reset default */
666 #define RXTL 1 /* reset default */
667
668 static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
669 {
670 unsigned int val;
671
672 /* set receiver / transmitter trigger level */
673 val = readl(sport->port.membase + UFCR) & (UFCR_RFDIV | UFCR_DCEDTE);
674 val |= TXTL << UFCR_TXTL_SHF | RXTL;
675 writel(val, sport->port.membase + UFCR);
676 return 0;
677 }
678
679 /* half the RX buffer size */
680 #define CTSTL 16
681
682 static int imx_startup(struct uart_port *port)
683 {
684 struct imx_port *sport = (struct imx_port *)port;
685 int retval;
686 unsigned long flags, temp;
687
688 imx_setup_ufcr(sport, 0);
689
690 /* disable the DREN bit (Data Ready interrupt enable) before
691 * requesting IRQs
692 */
693 temp = readl(sport->port.membase + UCR4);
694
695 if (USE_IRDA(sport))
696 temp |= UCR4_IRSC;
697
698 /* set the trigger level for CTS */
699 temp &= ~(UCR4_CTSTL_MASK<< UCR4_CTSTL_SHF);
700 temp |= CTSTL<< UCR4_CTSTL_SHF;
701
702 writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
703
704 if (USE_IRDA(sport)) {
705 /* reset fifo's and state machines */
706 int i = 100;
707 temp = readl(sport->port.membase + UCR2);
708 temp &= ~UCR2_SRST;
709 writel(temp, sport->port.membase + UCR2);
710 while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) &&
711 (--i > 0)) {
712 udelay(1);
713 }
714 }
715
716 /*
717 * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
718 * chips only have one interrupt.
719 */
720 if (sport->txirq > 0) {
721 retval = request_irq(sport->rxirq, imx_rxint, 0,
722 DRIVER_NAME, sport);
723 if (retval)
724 goto error_out1;
725
726 retval = request_irq(sport->txirq, imx_txint, 0,
727 DRIVER_NAME, sport);
728 if (retval)
729 goto error_out2;
730
731 /* do not use RTS IRQ on IrDA */
732 if (!USE_IRDA(sport)) {
733 retval = request_irq(sport->rtsirq, imx_rtsint, 0,
734 DRIVER_NAME, sport);
735 if (retval)
736 goto error_out3;
737 }
738 } else {
739 retval = request_irq(sport->port.irq, imx_int, 0,
740 DRIVER_NAME, sport);
741 if (retval) {
742 free_irq(sport->port.irq, sport);
743 goto error_out1;
744 }
745 }
746
747 spin_lock_irqsave(&sport->port.lock, flags);
748 /*
749 * Finally, clear and enable interrupts
750 */
751 writel(USR1_RTSD, sport->port.membase + USR1);
752
753 temp = readl(sport->port.membase + UCR1);
754 temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
755
756 if (USE_IRDA(sport)) {
757 temp |= UCR1_IREN;
758 temp &= ~(UCR1_RTSDEN);
759 }
760
761 writel(temp, sport->port.membase + UCR1);
762
763 temp = readl(sport->port.membase + UCR2);
764 temp |= (UCR2_RXEN | UCR2_TXEN);
765 writel(temp, sport->port.membase + UCR2);
766
767 if (USE_IRDA(sport)) {
768 /* clear RX-FIFO */
769 int i = 64;
770 while ((--i > 0) &&
771 (readl(sport->port.membase + URXD0) & URXD_CHARRDY)) {
772 barrier();
773 }
774 }
775
776 if (is_imx21_uart(sport)) {
777 temp = readl(sport->port.membase + UCR3);
778 temp |= IMX21_UCR3_RXDMUXSEL;
779 writel(temp, sport->port.membase + UCR3);
780 }
781
782 if (USE_IRDA(sport)) {
783 temp = readl(sport->port.membase + UCR4);
784 if (sport->irda_inv_rx)
785 temp |= UCR4_INVR;
786 else
787 temp &= ~(UCR4_INVR);
788 writel(temp | UCR4_DREN, sport->port.membase + UCR4);
789
790 temp = readl(sport->port.membase + UCR3);
791 if (sport->irda_inv_tx)
792 temp |= UCR3_INVT;
793 else
794 temp &= ~(UCR3_INVT);
795 writel(temp, sport->port.membase + UCR3);
796 }
797
798 /*
799 * Enable modem status interrupts
800 */
801 imx_enable_ms(&sport->port);
802 spin_unlock_irqrestore(&sport->port.lock,flags);
803
804 if (USE_IRDA(sport)) {
805 struct imxuart_platform_data *pdata;
806 pdata = sport->port.dev->platform_data;
807 sport->irda_inv_rx = pdata->irda_inv_rx;
808 sport->irda_inv_tx = pdata->irda_inv_tx;
809 sport->trcv_delay = pdata->transceiver_delay;
810 if (pdata->irda_enable)
811 pdata->irda_enable(1);
812 }
813
814 return 0;
815
816 error_out3:
817 if (sport->txirq)
818 free_irq(sport->txirq, sport);
819 error_out2:
820 if (sport->rxirq)
821 free_irq(sport->rxirq, sport);
822 error_out1:
823 return retval;
824 }
825
826 static void imx_shutdown(struct uart_port *port)
827 {
828 struct imx_port *sport = (struct imx_port *)port;
829 unsigned long temp;
830 unsigned long flags;
831
832 spin_lock_irqsave(&sport->port.lock, flags);
833 temp = readl(sport->port.membase + UCR2);
834 temp &= ~(UCR2_TXEN);
835 writel(temp, sport->port.membase + UCR2);
836 spin_unlock_irqrestore(&sport->port.lock, flags);
837
838 if (USE_IRDA(sport)) {
839 struct imxuart_platform_data *pdata;
840 pdata = sport->port.dev->platform_data;
841 if (pdata->irda_enable)
842 pdata->irda_enable(0);
843 }
844
845 /*
846 * Stop our timer.
847 */
848 del_timer_sync(&sport->timer);
849
850 /*
851 * Free the interrupts
852 */
853 if (sport->txirq > 0) {
854 if (!USE_IRDA(sport))
855 free_irq(sport->rtsirq, sport);
856 free_irq(sport->txirq, sport);
857 free_irq(sport->rxirq, sport);
858 } else
859 free_irq(sport->port.irq, sport);
860
861 /*
862 * Disable all interrupts, port and break condition.
863 */
864
865 spin_lock_irqsave(&sport->port.lock, flags);
866 temp = readl(sport->port.membase + UCR1);
867 temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
868 if (USE_IRDA(sport))
869 temp &= ~(UCR1_IREN);
870
871 writel(temp, sport->port.membase + UCR1);
872 spin_unlock_irqrestore(&sport->port.lock, flags);
873 }
874
875 static void
876 imx_set_termios(struct uart_port *port, struct ktermios *termios,
877 struct ktermios *old)
878 {
879 struct imx_port *sport = (struct imx_port *)port;
880 unsigned long flags;
881 unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
882 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
883 unsigned int div, ufcr;
884 unsigned long num, denom;
885 uint64_t tdiv64;
886
887 /*
888 * If we don't support modem control lines, don't allow
889 * these to be set.
890 */
891 if (0) {
892 termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
893 termios->c_cflag |= CLOCAL;
894 }
895
896 /*
897 * We only support CS7 and CS8.
898 */
899 while ((termios->c_cflag & CSIZE) != CS7 &&
900 (termios->c_cflag & CSIZE) != CS8) {
901 termios->c_cflag &= ~CSIZE;
902 termios->c_cflag |= old_csize;
903 old_csize = CS8;
904 }
905
906 if ((termios->c_cflag & CSIZE) == CS8)
907 ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
908 else
909 ucr2 = UCR2_SRST | UCR2_IRTS;
910
911 if (termios->c_cflag & CRTSCTS) {
912 if( sport->have_rtscts ) {
913 ucr2 &= ~UCR2_IRTS;
914 ucr2 |= UCR2_CTSC;
915 } else {
916 termios->c_cflag &= ~CRTSCTS;
917 }
918 }
919
920 if (termios->c_cflag & CSTOPB)
921 ucr2 |= UCR2_STPB;
922 if (termios->c_cflag & PARENB) {
923 ucr2 |= UCR2_PREN;
924 if (termios->c_cflag & PARODD)
925 ucr2 |= UCR2_PROE;
926 }
927
928 del_timer_sync(&sport->timer);
929
930 /*
931 * Ask the core to calculate the divisor for us.
932 */
933 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
934 quot = uart_get_divisor(port, baud);
935
936 spin_lock_irqsave(&sport->port.lock, flags);
937
938 sport->port.read_status_mask = 0;
939 if (termios->c_iflag & INPCK)
940 sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
941 if (termios->c_iflag & (BRKINT | PARMRK))
942 sport->port.read_status_mask |= URXD_BRK;
943
944 /*
945 * Characters to ignore
946 */
947 sport->port.ignore_status_mask = 0;
948 if (termios->c_iflag & IGNPAR)
949 sport->port.ignore_status_mask |= URXD_PRERR;
950 if (termios->c_iflag & IGNBRK) {
951 sport->port.ignore_status_mask |= URXD_BRK;
952 /*
953 * If we're ignoring parity and break indicators,
954 * ignore overruns too (for real raw support).
955 */
956 if (termios->c_iflag & IGNPAR)
957 sport->port.ignore_status_mask |= URXD_OVRRUN;
958 }
959
960 /*
961 * Update the per-port timeout.
962 */
963 uart_update_timeout(port, termios->c_cflag, baud);
964
965 /*
966 * disable interrupts and drain transmitter
967 */
968 old_ucr1 = readl(sport->port.membase + UCR1);
969 writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
970 sport->port.membase + UCR1);
971
972 while ( !(readl(sport->port.membase + USR2) & USR2_TXDC))
973 barrier();
974
975 /* then, disable everything */
976 old_txrxen = readl(sport->port.membase + UCR2);
977 writel(old_txrxen & ~( UCR2_TXEN | UCR2_RXEN),
978 sport->port.membase + UCR2);
979 old_txrxen &= (UCR2_TXEN | UCR2_RXEN);
980
981 if (USE_IRDA(sport)) {
982 /*
983 * use maximum available submodule frequency to
984 * avoid missing short pulses due to low sampling rate
985 */
986 div = 1;
987 } else {
988 div = sport->port.uartclk / (baud * 16);
989 if (div > 7)
990 div = 7;
991 if (!div)
992 div = 1;
993 }
994
995 rational_best_approximation(16 * div * baud, sport->port.uartclk,
996 1 << 16, 1 << 16, &num, &denom);
997
998 tdiv64 = sport->port.uartclk;
999 tdiv64 *= num;
1000 do_div(tdiv64, denom * 16 * div);
1001 tty_termios_encode_baud_rate(termios,
1002 (speed_t)tdiv64, (speed_t)tdiv64);
1003
1004 num -= 1;
1005 denom -= 1;
1006
1007 ufcr = readl(sport->port.membase + UFCR);
1008 ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div);
1009 writel(ufcr, sport->port.membase + UFCR);
1010
1011 writel(num, sport->port.membase + UBIR);
1012 writel(denom, sport->port.membase + UBMR);
1013
1014 if (is_imx21_uart(sport))
1015 writel(sport->port.uartclk / div / 1000,
1016 sport->port.membase + IMX21_ONEMS);
1017
1018 writel(old_ucr1, sport->port.membase + UCR1);
1019
1020 /* set the parity, stop bits and data size */
1021 writel(ucr2 | old_txrxen, sport->port.membase + UCR2);
1022
1023 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
1024 imx_enable_ms(&sport->port);
1025
1026 spin_unlock_irqrestore(&sport->port.lock, flags);
1027 }
1028
1029 static const char *imx_type(struct uart_port *port)
1030 {
1031 struct imx_port *sport = (struct imx_port *)port;
1032
1033 return sport->port.type == PORT_IMX ? "IMX" : NULL;
1034 }
1035
1036 /*
1037 * Release the memory region(s) being used by 'port'.
1038 */
1039 static void imx_release_port(struct uart_port *port)
1040 {
1041 struct platform_device *pdev = to_platform_device(port->dev);
1042 struct resource *mmres;
1043
1044 mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1045 release_mem_region(mmres->start, resource_size(mmres));
1046 }
1047
1048 /*
1049 * Request the memory region(s) being used by 'port'.
1050 */
1051 static int imx_request_port(struct uart_port *port)
1052 {
1053 struct platform_device *pdev = to_platform_device(port->dev);
1054 struct resource *mmres;
1055 void *ret;
1056
1057 mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1058 if (!mmres)
1059 return -ENODEV;
1060
1061 ret = request_mem_region(mmres->start, resource_size(mmres), "imx-uart");
1062
1063 return ret ? 0 : -EBUSY;
1064 }
1065
1066 /*
1067 * Configure/autoconfigure the port.
1068 */
1069 static void imx_config_port(struct uart_port *port, int flags)
1070 {
1071 struct imx_port *sport = (struct imx_port *)port;
1072
1073 if (flags & UART_CONFIG_TYPE &&
1074 imx_request_port(&sport->port) == 0)
1075 sport->port.type = PORT_IMX;
1076 }
1077
1078 /*
1079 * Verify the new serial_struct (for TIOCSSERIAL).
1080 * The only change we allow are to the flags and type, and
1081 * even then only between PORT_IMX and PORT_UNKNOWN
1082 */
1083 static int
1084 imx_verify_port(struct uart_port *port, struct serial_struct *ser)
1085 {
1086 struct imx_port *sport = (struct imx_port *)port;
1087 int ret = 0;
1088
1089 if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
1090 ret = -EINVAL;
1091 if (sport->port.irq != ser->irq)
1092 ret = -EINVAL;
1093 if (ser->io_type != UPIO_MEM)
1094 ret = -EINVAL;
1095 if (sport->port.uartclk / 16 != ser->baud_base)
1096 ret = -EINVAL;
1097 if ((void *)sport->port.mapbase != ser->iomem_base)
1098 ret = -EINVAL;
1099 if (sport->port.iobase != ser->port)
1100 ret = -EINVAL;
1101 if (ser->hub6 != 0)
1102 ret = -EINVAL;
1103 return ret;
1104 }
1105
1106 #if defined(CONFIG_CONSOLE_POLL)
1107 static int imx_poll_get_char(struct uart_port *port)
1108 {
1109 struct imx_port_ucrs old_ucr;
1110 unsigned int status;
1111 unsigned char c;
1112
1113 /* save control registers */
1114 imx_port_ucrs_save(port, &old_ucr);
1115
1116 /* disable interrupts */
1117 writel(UCR1_UARTEN, port->membase + UCR1);
1118 writel(old_ucr.ucr2 & ~(UCR2_ATEN | UCR2_RTSEN | UCR2_ESCI),
1119 port->membase + UCR2);
1120 writel(old_ucr.ucr3 & ~(UCR3_DCD | UCR3_RI | UCR3_DTREN),
1121 port->membase + UCR3);
1122
1123 /* poll */
1124 do {
1125 status = readl(port->membase + USR2);
1126 } while (~status & USR2_RDR);
1127
1128 /* read */
1129 c = readl(port->membase + URXD0);
1130
1131 /* restore control registers */
1132 imx_port_ucrs_restore(port, &old_ucr);
1133
1134 return c;
1135 }
1136
1137 static void imx_poll_put_char(struct uart_port *port, unsigned char c)
1138 {
1139 struct imx_port_ucrs old_ucr;
1140 unsigned int status;
1141
1142 /* save control registers */
1143 imx_port_ucrs_save(port, &old_ucr);
1144
1145 /* disable interrupts */
1146 writel(UCR1_UARTEN, port->membase + UCR1);
1147 writel(old_ucr.ucr2 & ~(UCR2_ATEN | UCR2_RTSEN | UCR2_ESCI),
1148 port->membase + UCR2);
1149 writel(old_ucr.ucr3 & ~(UCR3_DCD | UCR3_RI | UCR3_DTREN),
1150 port->membase + UCR3);
1151
1152 /* drain */
1153 do {
1154 status = readl(port->membase + USR1);
1155 } while (~status & USR1_TRDY);
1156
1157 /* write */
1158 writel(c, port->membase + URTX0);
1159
1160 /* flush */
1161 do {
1162 status = readl(port->membase + USR2);
1163 } while (~status & USR2_TXDC);
1164
1165 /* restore control registers */
1166 imx_port_ucrs_restore(port, &old_ucr);
1167 }
1168 #endif
1169
1170 static struct uart_ops imx_pops = {
1171 .tx_empty = imx_tx_empty,
1172 .set_mctrl = imx_set_mctrl,
1173 .get_mctrl = imx_get_mctrl,
1174 .stop_tx = imx_stop_tx,
1175 .start_tx = imx_start_tx,
1176 .stop_rx = imx_stop_rx,
1177 .enable_ms = imx_enable_ms,
1178 .break_ctl = imx_break_ctl,
1179 .startup = imx_startup,
1180 .shutdown = imx_shutdown,
1181 .set_termios = imx_set_termios,
1182 .type = imx_type,
1183 .release_port = imx_release_port,
1184 .request_port = imx_request_port,
1185 .config_port = imx_config_port,
1186 .verify_port = imx_verify_port,
1187 #if defined(CONFIG_CONSOLE_POLL)
1188 .poll_get_char = imx_poll_get_char,
1189 .poll_put_char = imx_poll_put_char,
1190 #endif
1191 };
1192
1193 static struct imx_port *imx_ports[UART_NR];
1194
1195 #ifdef CONFIG_SERIAL_IMX_CONSOLE
1196 static void imx_console_putchar(struct uart_port *port, int ch)
1197 {
1198 struct imx_port *sport = (struct imx_port *)port;
1199
1200 while (readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)
1201 barrier();
1202
1203 writel(ch, sport->port.membase + URTX0);
1204 }
1205
1206 /*
1207 * Interrupts are disabled on entering
1208 */
1209 static void
1210 imx_console_write(struct console *co, const char *s, unsigned int count)
1211 {
1212 struct imx_port *sport = imx_ports[co->index];
1213 struct imx_port_ucrs old_ucr;
1214 unsigned int ucr1;
1215 unsigned long flags;
1216
1217 spin_lock_irqsave(&sport->port.lock, flags);
1218
1219 /*
1220 * First, save UCR1/2/3 and then disable interrupts
1221 */
1222 imx_port_ucrs_save(&sport->port, &old_ucr);
1223 ucr1 = old_ucr.ucr1;
1224
1225 if (is_imx1_uart(sport))
1226 ucr1 |= IMX1_UCR1_UARTCLKEN;
1227 ucr1 |= UCR1_UARTEN;
1228 ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
1229
1230 writel(ucr1, sport->port.membase + UCR1);
1231
1232 writel(old_ucr.ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
1233
1234 uart_console_write(&sport->port, s, count, imx_console_putchar);
1235
1236 /*
1237 * Finally, wait for transmitter to become empty
1238 * and restore UCR1/2/3
1239 */
1240 while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
1241
1242 imx_port_ucrs_restore(&sport->port, &old_ucr);
1243
1244 spin_unlock_irqrestore(&sport->port.lock, flags);
1245 }
1246
1247 /*
1248 * If the port was already initialised (eg, by a boot loader),
1249 * try to determine the current setup.
1250 */
1251 static void __init
1252 imx_console_get_options(struct imx_port *sport, int *baud,
1253 int *parity, int *bits)
1254 {
1255
1256 if (readl(sport->port.membase + UCR1) & UCR1_UARTEN) {
1257 /* ok, the port was enabled */
1258 unsigned int ucr2, ubir,ubmr, uartclk;
1259 unsigned int baud_raw;
1260 unsigned int ucfr_rfdiv;
1261
1262 ucr2 = readl(sport->port.membase + UCR2);
1263
1264 *parity = 'n';
1265 if (ucr2 & UCR2_PREN) {
1266 if (ucr2 & UCR2_PROE)
1267 *parity = 'o';
1268 else
1269 *parity = 'e';
1270 }
1271
1272 if (ucr2 & UCR2_WS)
1273 *bits = 8;
1274 else
1275 *bits = 7;
1276
1277 ubir = readl(sport->port.membase + UBIR) & 0xffff;
1278 ubmr = readl(sport->port.membase + UBMR) & 0xffff;
1279
1280 ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7;
1281 if (ucfr_rfdiv == 6)
1282 ucfr_rfdiv = 7;
1283 else
1284 ucfr_rfdiv = 6 - ucfr_rfdiv;
1285
1286 uartclk = clk_get_rate(sport->clk_per);
1287 uartclk /= ucfr_rfdiv;
1288
1289 { /*
1290 * The next code provides exact computation of
1291 * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
1292 * without need of float support or long long division,
1293 * which would be required to prevent 32bit arithmetic overflow
1294 */
1295 unsigned int mul = ubir + 1;
1296 unsigned int div = 16 * (ubmr + 1);
1297 unsigned int rem = uartclk % div;
1298
1299 baud_raw = (uartclk / div) * mul;
1300 baud_raw += (rem * mul + div / 2) / div;
1301 *baud = (baud_raw + 50) / 100 * 100;
1302 }
1303
1304 if(*baud != baud_raw)
1305 printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
1306 baud_raw, *baud);
1307 }
1308 }
1309
1310 static int __init
1311 imx_console_setup(struct console *co, char *options)
1312 {
1313 struct imx_port *sport;
1314 int baud = 9600;
1315 int bits = 8;
1316 int parity = 'n';
1317 int flow = 'n';
1318
1319 /*
1320 * Check whether an invalid uart number has been specified, and
1321 * if so, search for the first available port that does have
1322 * console support.
1323 */
1324 if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports))
1325 co->index = 0;
1326 sport = imx_ports[co->index];
1327 if(sport == NULL)
1328 return -ENODEV;
1329
1330 if (options)
1331 uart_parse_options(options, &baud, &parity, &bits, &flow);
1332 else
1333 imx_console_get_options(sport, &baud, &parity, &bits);
1334
1335 imx_setup_ufcr(sport, 0);
1336
1337 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
1338 }
1339
1340 static struct uart_driver imx_reg;
1341 static struct console imx_console = {
1342 .name = DEV_NAME,
1343 .write = imx_console_write,
1344 .device = uart_console_device,
1345 .setup = imx_console_setup,
1346 .flags = CON_PRINTBUFFER,
1347 .index = -1,
1348 .data = &imx_reg,
1349 };
1350
1351 #define IMX_CONSOLE &imx_console
1352 #else
1353 #define IMX_CONSOLE NULL
1354 #endif
1355
1356 static struct uart_driver imx_reg = {
1357 .owner = THIS_MODULE,
1358 .driver_name = DRIVER_NAME,
1359 .dev_name = DEV_NAME,
1360 .major = SERIAL_IMX_MAJOR,
1361 .minor = MINOR_START,
1362 .nr = ARRAY_SIZE(imx_ports),
1363 .cons = IMX_CONSOLE,
1364 };
1365
1366 static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
1367 {
1368 struct imx_port *sport = platform_get_drvdata(dev);
1369 unsigned int val;
1370
1371 /* enable wakeup from i.MX UART */
1372 val = readl(sport->port.membase + UCR3);
1373 val |= UCR3_AWAKEN;
1374 writel(val, sport->port.membase + UCR3);
1375
1376 if (sport)
1377 uart_suspend_port(&imx_reg, &sport->port);
1378
1379 return 0;
1380 }
1381
1382 static int serial_imx_resume(struct platform_device *dev)
1383 {
1384 struct imx_port *sport = platform_get_drvdata(dev);
1385 unsigned int val;
1386
1387 /* disable wakeup from i.MX UART */
1388 val = readl(sport->port.membase + UCR3);
1389 val &= ~UCR3_AWAKEN;
1390 writel(val, sport->port.membase + UCR3);
1391
1392 if (sport)
1393 uart_resume_port(&imx_reg, &sport->port);
1394
1395 return 0;
1396 }
1397
1398 #ifdef CONFIG_OF
1399 /*
1400 * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it
1401 * could successfully get all information from dt or a negative errno.
1402 */
1403 static int serial_imx_probe_dt(struct imx_port *sport,
1404 struct platform_device *pdev)
1405 {
1406 struct device_node *np = pdev->dev.of_node;
1407 const struct of_device_id *of_id =
1408 of_match_device(imx_uart_dt_ids, &pdev->dev);
1409 int ret;
1410
1411 if (!np)
1412 /* no device tree device */
1413 return 1;
1414
1415 ret = of_alias_get_id(np, "serial");
1416 if (ret < 0) {
1417 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
1418 return ret;
1419 }
1420 sport->port.line = ret;
1421
1422 if (of_get_property(np, "fsl,uart-has-rtscts", NULL))
1423 sport->have_rtscts = 1;
1424
1425 if (of_get_property(np, "fsl,irda-mode", NULL))
1426 sport->use_irda = 1;
1427
1428 sport->devdata = of_id->data;
1429
1430 return 0;
1431 }
1432 #else
1433 static inline int serial_imx_probe_dt(struct imx_port *sport,
1434 struct platform_device *pdev)
1435 {
1436 return 1;
1437 }
1438 #endif
1439
1440 static void serial_imx_probe_pdata(struct imx_port *sport,
1441 struct platform_device *pdev)
1442 {
1443 struct imxuart_platform_data *pdata = pdev->dev.platform_data;
1444
1445 sport->port.line = pdev->id;
1446 sport->devdata = (struct imx_uart_data *) pdev->id_entry->driver_data;
1447
1448 if (!pdata)
1449 return;
1450
1451 if (pdata->flags & IMXUART_HAVE_RTSCTS)
1452 sport->have_rtscts = 1;
1453
1454 if (pdata->flags & IMXUART_IRDA)
1455 sport->use_irda = 1;
1456 }
1457
1458 static int serial_imx_probe(struct platform_device *pdev)
1459 {
1460 struct imx_port *sport;
1461 struct imxuart_platform_data *pdata;
1462 void __iomem *base;
1463 int ret = 0;
1464 struct resource *res;
1465 struct pinctrl *pinctrl;
1466
1467 sport = kzalloc(sizeof(*sport), GFP_KERNEL);
1468 if (!sport)
1469 return -ENOMEM;
1470
1471 ret = serial_imx_probe_dt(sport, pdev);
1472 if (ret > 0)
1473 serial_imx_probe_pdata(sport, pdev);
1474 else if (ret < 0)
1475 goto free;
1476
1477 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1478 if (!res) {
1479 ret = -ENODEV;
1480 goto free;
1481 }
1482
1483 base = ioremap(res->start, PAGE_SIZE);
1484 if (!base) {
1485 ret = -ENOMEM;
1486 goto free;
1487 }
1488
1489 sport->port.dev = &pdev->dev;
1490 sport->port.mapbase = res->start;
1491 sport->port.membase = base;
1492 sport->port.type = PORT_IMX,
1493 sport->port.iotype = UPIO_MEM;
1494 sport->port.irq = platform_get_irq(pdev, 0);
1495 sport->rxirq = platform_get_irq(pdev, 0);
1496 sport->txirq = platform_get_irq(pdev, 1);
1497 sport->rtsirq = platform_get_irq(pdev, 2);
1498 sport->port.fifosize = 32;
1499 sport->port.ops = &imx_pops;
1500 sport->port.flags = UPF_BOOT_AUTOCONF;
1501 init_timer(&sport->timer);
1502 sport->timer.function = imx_timeout;
1503 sport->timer.data = (unsigned long)sport;
1504
1505 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
1506 if (IS_ERR(pinctrl)) {
1507 ret = PTR_ERR(pinctrl);
1508 goto unmap;
1509 }
1510
1511 sport->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1512 if (IS_ERR(sport->clk_ipg)) {
1513 ret = PTR_ERR(sport->clk_ipg);
1514 goto unmap;
1515 }
1516
1517 sport->clk_per = devm_clk_get(&pdev->dev, "per");
1518 if (IS_ERR(sport->clk_per)) {
1519 ret = PTR_ERR(sport->clk_per);
1520 goto unmap;
1521 }
1522
1523 clk_prepare_enable(sport->clk_per);
1524 clk_prepare_enable(sport->clk_ipg);
1525
1526 sport->port.uartclk = clk_get_rate(sport->clk_per);
1527
1528 imx_ports[sport->port.line] = sport;
1529
1530 pdata = pdev->dev.platform_data;
1531 if (pdata && pdata->init) {
1532 ret = pdata->init(pdev);
1533 if (ret)
1534 goto clkput;
1535 }
1536
1537 ret = uart_add_one_port(&imx_reg, &sport->port);
1538 if (ret)
1539 goto deinit;
1540 platform_set_drvdata(pdev, &sport->port);
1541
1542 return 0;
1543 deinit:
1544 if (pdata && pdata->exit)
1545 pdata->exit(pdev);
1546 clkput:
1547 clk_disable_unprepare(sport->clk_per);
1548 clk_disable_unprepare(sport->clk_ipg);
1549 unmap:
1550 iounmap(sport->port.membase);
1551 free:
1552 kfree(sport);
1553
1554 return ret;
1555 }
1556
1557 static int serial_imx_remove(struct platform_device *pdev)
1558 {
1559 struct imxuart_platform_data *pdata;
1560 struct imx_port *sport = platform_get_drvdata(pdev);
1561
1562 pdata = pdev->dev.platform_data;
1563
1564 platform_set_drvdata(pdev, NULL);
1565
1566 uart_remove_one_port(&imx_reg, &sport->port);
1567
1568 clk_disable_unprepare(sport->clk_per);
1569 clk_disable_unprepare(sport->clk_ipg);
1570
1571 if (pdata && pdata->exit)
1572 pdata->exit(pdev);
1573
1574 iounmap(sport->port.membase);
1575 kfree(sport);
1576
1577 return 0;
1578 }
1579
1580 static struct platform_driver serial_imx_driver = {
1581 .probe = serial_imx_probe,
1582 .remove = serial_imx_remove,
1583
1584 .suspend = serial_imx_suspend,
1585 .resume = serial_imx_resume,
1586 .id_table = imx_uart_devtype,
1587 .driver = {
1588 .name = "imx-uart",
1589 .owner = THIS_MODULE,
1590 .of_match_table = imx_uart_dt_ids,
1591 },
1592 };
1593
1594 static int __init imx_serial_init(void)
1595 {
1596 int ret;
1597
1598 printk(KERN_INFO "Serial: IMX driver\n");
1599
1600 ret = uart_register_driver(&imx_reg);
1601 if (ret)
1602 return ret;
1603
1604 ret = platform_driver_register(&serial_imx_driver);
1605 if (ret != 0)
1606 uart_unregister_driver(&imx_reg);
1607
1608 return ret;
1609 }
1610
1611 static void __exit imx_serial_exit(void)
1612 {
1613 platform_driver_unregister(&serial_imx_driver);
1614 uart_unregister_driver(&imx_reg);
1615 }
1616
1617 module_init(imx_serial_init);
1618 module_exit(imx_serial_exit);
1619
1620 MODULE_AUTHOR("Sascha Hauer");
1621 MODULE_DESCRIPTION("IMX generic serial port driver");
1622 MODULE_LICENSE("GPL");
1623 MODULE_ALIAS("platform:imx-uart");
Linux kernel - Deliverables
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