workqueue: remove spurious WARN_ON_ONCE(in_irq()) from try_to_grab_pending()
[linux-3.10.git] / drivers / tty / serial / omap-serial.c
1 /*
2  * Driver for OMAP-UART controller.
3  * Based on drivers/serial/8250.c
4  *
5  * Copyright (C) 2010 Texas Instruments.
6  *
7  * Authors:
8  *      Govindraj R     <govindraj.raja@ti.com>
9  *      Thara Gopinath  <thara@ti.com>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * Note: This driver is made separate from 8250 driver as we cannot
17  * over load 8250 driver with omap platform specific configuration for
18  * features like DMA, it makes easier to implement features like DMA and
19  * hardware flow control and software flow control configuration with
20  * this driver as required for the omap-platform.
21  */
22
23 #if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
24 #define SUPPORT_SYSRQ
25 #endif
26
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/console.h>
30 #include <linux/serial_reg.h>
31 #include <linux/delay.h>
32 #include <linux/slab.h>
33 #include <linux/tty.h>
34 #include <linux/tty_flip.h>
35 #include <linux/io.h>
36 #include <linux/dma-mapping.h>
37 #include <linux/clk.h>
38 #include <linux/serial_core.h>
39 #include <linux/irq.h>
40 #include <linux/pm_runtime.h>
41 #include <linux/of.h>
42
43 #include <plat/dma.h>
44 #include <plat/dmtimer.h>
45 #include <plat/omap-serial.h>
46
47 #define UART_BUILD_REVISION(x, y)       (((x) << 8) | (y))
48
49 #define OMAP_UART_REV_42 0x0402
50 #define OMAP_UART_REV_46 0x0406
51 #define OMAP_UART_REV_52 0x0502
52 #define OMAP_UART_REV_63 0x0603
53
54 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
55
56 /* SCR register bitmasks */
57 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK               (1 << 7)
58
59 /* FCR register bitmasks */
60 #define OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT                6
61 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK                 (0x3 << 6)
62
63 /* MVR register bitmasks */
64 #define OMAP_UART_MVR_SCHEME_SHIFT      30
65
66 #define OMAP_UART_LEGACY_MVR_MAJ_MASK   0xf0
67 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT  4
68 #define OMAP_UART_LEGACY_MVR_MIN_MASK   0x0f
69
70 #define OMAP_UART_MVR_MAJ_MASK          0x700
71 #define OMAP_UART_MVR_MAJ_SHIFT         8
72 #define OMAP_UART_MVR_MIN_MASK          0x3f
73
74 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
75
76 /* Forward declaration of functions */
77 static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
78 static void serial_omap_rxdma_poll(unsigned long uart_no);
79 static int serial_omap_start_rxdma(struct uart_omap_port *up);
80 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
81
82 static struct workqueue_struct *serial_omap_uart_wq;
83
84 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
85 {
86         offset <<= up->port.regshift;
87         return readw(up->port.membase + offset);
88 }
89
90 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
91 {
92         offset <<= up->port.regshift;
93         writew(value, up->port.membase + offset);
94 }
95
96 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
97 {
98         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
99         serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
100                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
101         serial_out(up, UART_FCR, 0);
102 }
103
104 /*
105  * serial_omap_get_divisor - calculate divisor value
106  * @port: uart port info
107  * @baud: baudrate for which divisor needs to be calculated.
108  *
109  * We have written our own function to get the divisor so as to support
110  * 13x mode. 3Mbps Baudrate as an different divisor.
111  * Reference OMAP TRM Chapter 17:
112  * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
113  * referring to oversampling - divisor value
114  * baudrate 460,800 to 3,686,400 all have divisor 13
115  * except 3,000,000 which has divisor value 16
116  */
117 static unsigned int
118 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
119 {
120         unsigned int divisor;
121
122         if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
123                 divisor = 13;
124         else
125                 divisor = 16;
126         return port->uartclk/(baud * divisor);
127 }
128
129 static void serial_omap_stop_rxdma(struct uart_omap_port *up)
130 {
131         if (up->uart_dma.rx_dma_used) {
132                 del_timer(&up->uart_dma.rx_timer);
133                 omap_stop_dma(up->uart_dma.rx_dma_channel);
134                 omap_free_dma(up->uart_dma.rx_dma_channel);
135                 up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
136                 up->uart_dma.rx_dma_used = false;
137                 pm_runtime_mark_last_busy(&up->pdev->dev);
138                 pm_runtime_put_autosuspend(&up->pdev->dev);
139         }
140 }
141
142 static void serial_omap_enable_ms(struct uart_port *port)
143 {
144         struct uart_omap_port *up = (struct uart_omap_port *)port;
145
146         dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
147
148         pm_runtime_get_sync(&up->pdev->dev);
149         up->ier |= UART_IER_MSI;
150         serial_out(up, UART_IER, up->ier);
151         pm_runtime_put(&up->pdev->dev);
152 }
153
154 static void serial_omap_stop_tx(struct uart_port *port)
155 {
156         struct uart_omap_port *up = (struct uart_omap_port *)port;
157         struct omap_uart_port_info *pdata = up->pdev->dev.platform_data;
158
159         if (up->use_dma &&
160                 up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
161                 /*
162                  * Check if dma is still active. If yes do nothing,
163                  * return. Else stop dma
164                  */
165                 if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel))
166                         return;
167                 omap_stop_dma(up->uart_dma.tx_dma_channel);
168                 omap_free_dma(up->uart_dma.tx_dma_channel);
169                 up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
170                 pm_runtime_mark_last_busy(&up->pdev->dev);
171                 pm_runtime_put_autosuspend(&up->pdev->dev);
172         }
173
174         pm_runtime_get_sync(&up->pdev->dev);
175         if (up->ier & UART_IER_THRI) {
176                 up->ier &= ~UART_IER_THRI;
177                 serial_out(up, UART_IER, up->ier);
178         }
179
180         if (!up->use_dma && pdata && pdata->set_forceidle)
181                 pdata->set_forceidle(up->pdev);
182
183         pm_runtime_mark_last_busy(&up->pdev->dev);
184         pm_runtime_put_autosuspend(&up->pdev->dev);
185 }
186
187 static void serial_omap_stop_rx(struct uart_port *port)
188 {
189         struct uart_omap_port *up = (struct uart_omap_port *)port;
190
191         pm_runtime_get_sync(&up->pdev->dev);
192         if (up->use_dma)
193                 serial_omap_stop_rxdma(up);
194         up->ier &= ~UART_IER_RLSI;
195         up->port.read_status_mask &= ~UART_LSR_DR;
196         serial_out(up, UART_IER, up->ier);
197         pm_runtime_mark_last_busy(&up->pdev->dev);
198         pm_runtime_put_autosuspend(&up->pdev->dev);
199 }
200
201 static inline void receive_chars(struct uart_omap_port *up,
202                 unsigned int *status)
203 {
204         struct tty_struct *tty = up->port.state->port.tty;
205         unsigned int flag, lsr = *status;
206         unsigned char ch = 0;
207         int max_count = 256;
208
209         do {
210                 if (likely(lsr & UART_LSR_DR))
211                         ch = serial_in(up, UART_RX);
212                 flag = TTY_NORMAL;
213                 up->port.icount.rx++;
214
215                 if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
216                         /*
217                          * For statistics only
218                          */
219                         if (lsr & UART_LSR_BI) {
220                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
221                                 up->port.icount.brk++;
222                                 /*
223                                  * We do the SysRQ and SAK checking
224                                  * here because otherwise the break
225                                  * may get masked by ignore_status_mask
226                                  * or read_status_mask.
227                                  */
228                                 if (uart_handle_break(&up->port))
229                                         goto ignore_char;
230                         } else if (lsr & UART_LSR_PE) {
231                                 up->port.icount.parity++;
232                         } else if (lsr & UART_LSR_FE) {
233                                 up->port.icount.frame++;
234                         }
235
236                         if (lsr & UART_LSR_OE)
237                                 up->port.icount.overrun++;
238
239                         /*
240                          * Mask off conditions which should be ignored.
241                          */
242                         lsr &= up->port.read_status_mask;
243
244 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
245                         if (up->port.line == up->port.cons->index) {
246                                 /* Recover the break flag from console xmit */
247                                 lsr |= up->lsr_break_flag;
248                         }
249 #endif
250                         if (lsr & UART_LSR_BI)
251                                 flag = TTY_BREAK;
252                         else if (lsr & UART_LSR_PE)
253                                 flag = TTY_PARITY;
254                         else if (lsr & UART_LSR_FE)
255                                 flag = TTY_FRAME;
256                 }
257
258                 if (uart_handle_sysrq_char(&up->port, ch))
259                         goto ignore_char;
260                 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
261 ignore_char:
262                 lsr = serial_in(up, UART_LSR);
263         } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
264         spin_unlock(&up->port.lock);
265         tty_flip_buffer_push(tty);
266         spin_lock(&up->port.lock);
267 }
268
269 static void transmit_chars(struct uart_omap_port *up)
270 {
271         struct circ_buf *xmit = &up->port.state->xmit;
272         int count;
273
274         if (up->port.x_char) {
275                 serial_out(up, UART_TX, up->port.x_char);
276                 up->port.icount.tx++;
277                 up->port.x_char = 0;
278                 return;
279         }
280         if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
281                 serial_omap_stop_tx(&up->port);
282                 return;
283         }
284         count = up->port.fifosize / 4;
285         do {
286                 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
287                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
288                 up->port.icount.tx++;
289                 if (uart_circ_empty(xmit))
290                         break;
291         } while (--count > 0);
292
293         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
294                 uart_write_wakeup(&up->port);
295
296         if (uart_circ_empty(xmit))
297                 serial_omap_stop_tx(&up->port);
298 }
299
300 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
301 {
302         if (!(up->ier & UART_IER_THRI)) {
303                 up->ier |= UART_IER_THRI;
304                 serial_out(up, UART_IER, up->ier);
305         }
306 }
307
308 static void serial_omap_start_tx(struct uart_port *port)
309 {
310         struct uart_omap_port *up = (struct uart_omap_port *)port;
311         struct omap_uart_port_info *pdata = up->pdev->dev.platform_data;
312         struct circ_buf *xmit;
313         unsigned int start;
314         int ret = 0;
315
316         if (!up->use_dma) {
317                 pm_runtime_get_sync(&up->pdev->dev);
318                 serial_omap_enable_ier_thri(up);
319                 if (pdata && pdata->set_noidle)
320                         pdata->set_noidle(up->pdev);
321                 pm_runtime_mark_last_busy(&up->pdev->dev);
322                 pm_runtime_put_autosuspend(&up->pdev->dev);
323                 return;
324         }
325
326         if (up->uart_dma.tx_dma_used)
327                 return;
328
329         xmit = &up->port.state->xmit;
330
331         if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) {
332                 pm_runtime_get_sync(&up->pdev->dev);
333                 ret = omap_request_dma(up->uart_dma.uart_dma_tx,
334                                 "UART Tx DMA",
335                                 (void *)uart_tx_dma_callback, up,
336                                 &(up->uart_dma.tx_dma_channel));
337
338                 if (ret < 0) {
339                         serial_omap_enable_ier_thri(up);
340                         return;
341                 }
342         }
343         spin_lock(&(up->uart_dma.tx_lock));
344         up->uart_dma.tx_dma_used = true;
345         spin_unlock(&(up->uart_dma.tx_lock));
346
347         start = up->uart_dma.tx_buf_dma_phys +
348                                 (xmit->tail & (UART_XMIT_SIZE - 1));
349
350         up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
351         /*
352          * It is a circular buffer. See if the buffer has wounded back.
353          * If yes it will have to be transferred in two separate dma
354          * transfers
355          */
356         if (start + up->uart_dma.tx_buf_size >=
357                         up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
358                 up->uart_dma.tx_buf_size =
359                         (up->uart_dma.tx_buf_dma_phys +
360                         UART_XMIT_SIZE) - start;
361
362         omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
363                                 OMAP_DMA_AMODE_CONSTANT,
364                                 up->uart_dma.uart_base, 0, 0);
365         omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
366                                 OMAP_DMA_AMODE_POST_INC, start, 0, 0);
367         omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
368                                 OMAP_DMA_DATA_TYPE_S8,
369                                 up->uart_dma.tx_buf_size, 1,
370                                 OMAP_DMA_SYNC_ELEMENT,
371                                 up->uart_dma.uart_dma_tx, 0);
372         /* FIXME: Cache maintenance needed here? */
373         omap_start_dma(up->uart_dma.tx_dma_channel);
374 }
375
376 static unsigned int check_modem_status(struct uart_omap_port *up)
377 {
378         unsigned int status;
379
380         status = serial_in(up, UART_MSR);
381         status |= up->msr_saved_flags;
382         up->msr_saved_flags = 0;
383         if ((status & UART_MSR_ANY_DELTA) == 0)
384                 return status;
385
386         if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
387             up->port.state != NULL) {
388                 if (status & UART_MSR_TERI)
389                         up->port.icount.rng++;
390                 if (status & UART_MSR_DDSR)
391                         up->port.icount.dsr++;
392                 if (status & UART_MSR_DDCD)
393                         uart_handle_dcd_change
394                                 (&up->port, status & UART_MSR_DCD);
395                 if (status & UART_MSR_DCTS)
396                         uart_handle_cts_change
397                                 (&up->port, status & UART_MSR_CTS);
398                 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
399         }
400
401         return status;
402 }
403
404 /**
405  * serial_omap_irq() - This handles the interrupt from one port
406  * @irq: uart port irq number
407  * @dev_id: uart port info
408  */
409 static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
410 {
411         struct uart_omap_port *up = dev_id;
412         unsigned int iir, lsr;
413         unsigned long flags;
414
415         pm_runtime_get_sync(&up->pdev->dev);
416         iir = serial_in(up, UART_IIR);
417         if (iir & UART_IIR_NO_INT) {
418                 pm_runtime_mark_last_busy(&up->pdev->dev);
419                 pm_runtime_put_autosuspend(&up->pdev->dev);
420                 return IRQ_NONE;
421         }
422
423         spin_lock_irqsave(&up->port.lock, flags);
424         lsr = serial_in(up, UART_LSR);
425         if (iir & UART_IIR_RLSI) {
426                 if (!up->use_dma) {
427                         if (lsr & UART_LSR_DR)
428                                 receive_chars(up, &lsr);
429                 } else {
430                         up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
431                         serial_out(up, UART_IER, up->ier);
432                         if ((serial_omap_start_rxdma(up) != 0) &&
433                                         (lsr & UART_LSR_DR))
434                                 receive_chars(up, &lsr);
435                 }
436         }
437
438         check_modem_status(up);
439         if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
440                 transmit_chars(up);
441
442         spin_unlock_irqrestore(&up->port.lock, flags);
443         pm_runtime_mark_last_busy(&up->pdev->dev);
444         pm_runtime_put_autosuspend(&up->pdev->dev);
445
446         up->port_activity = jiffies;
447         return IRQ_HANDLED;
448 }
449
450 static unsigned int serial_omap_tx_empty(struct uart_port *port)
451 {
452         struct uart_omap_port *up = (struct uart_omap_port *)port;
453         unsigned long flags = 0;
454         unsigned int ret = 0;
455
456         pm_runtime_get_sync(&up->pdev->dev);
457         dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
458         spin_lock_irqsave(&up->port.lock, flags);
459         ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
460         spin_unlock_irqrestore(&up->port.lock, flags);
461         pm_runtime_put(&up->pdev->dev);
462         return ret;
463 }
464
465 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
466 {
467         struct uart_omap_port *up = (struct uart_omap_port *)port;
468         unsigned int status;
469         unsigned int ret = 0;
470
471         pm_runtime_get_sync(&up->pdev->dev);
472         status = check_modem_status(up);
473         pm_runtime_put(&up->pdev->dev);
474
475         dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
476
477         if (status & UART_MSR_DCD)
478                 ret |= TIOCM_CAR;
479         if (status & UART_MSR_RI)
480                 ret |= TIOCM_RNG;
481         if (status & UART_MSR_DSR)
482                 ret |= TIOCM_DSR;
483         if (status & UART_MSR_CTS)
484                 ret |= TIOCM_CTS;
485         return ret;
486 }
487
488 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
489 {
490         struct uart_omap_port *up = (struct uart_omap_port *)port;
491         unsigned char mcr = 0;
492
493         dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
494         if (mctrl & TIOCM_RTS)
495                 mcr |= UART_MCR_RTS;
496         if (mctrl & TIOCM_DTR)
497                 mcr |= UART_MCR_DTR;
498         if (mctrl & TIOCM_OUT1)
499                 mcr |= UART_MCR_OUT1;
500         if (mctrl & TIOCM_OUT2)
501                 mcr |= UART_MCR_OUT2;
502         if (mctrl & TIOCM_LOOP)
503                 mcr |= UART_MCR_LOOP;
504
505         pm_runtime_get_sync(&up->pdev->dev);
506         up->mcr = serial_in(up, UART_MCR);
507         up->mcr |= mcr;
508         serial_out(up, UART_MCR, up->mcr);
509         pm_runtime_put(&up->pdev->dev);
510 }
511
512 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
513 {
514         struct uart_omap_port *up = (struct uart_omap_port *)port;
515         unsigned long flags = 0;
516
517         dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
518         pm_runtime_get_sync(&up->pdev->dev);
519         spin_lock_irqsave(&up->port.lock, flags);
520         if (break_state == -1)
521                 up->lcr |= UART_LCR_SBC;
522         else
523                 up->lcr &= ~UART_LCR_SBC;
524         serial_out(up, UART_LCR, up->lcr);
525         spin_unlock_irqrestore(&up->port.lock, flags);
526         pm_runtime_put(&up->pdev->dev);
527 }
528
529 static int serial_omap_startup(struct uart_port *port)
530 {
531         struct uart_omap_port *up = (struct uart_omap_port *)port;
532         unsigned long flags = 0;
533         int retval;
534
535         /*
536          * Allocate the IRQ
537          */
538         retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
539                                 up->name, up);
540         if (retval)
541                 return retval;
542
543         dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
544
545         pm_runtime_get_sync(&up->pdev->dev);
546         /*
547          * Clear the FIFO buffers and disable them.
548          * (they will be reenabled in set_termios())
549          */
550         serial_omap_clear_fifos(up);
551         /* For Hardware flow control */
552         serial_out(up, UART_MCR, UART_MCR_RTS);
553
554         /*
555          * Clear the interrupt registers.
556          */
557         (void) serial_in(up, UART_LSR);
558         if (serial_in(up, UART_LSR) & UART_LSR_DR)
559                 (void) serial_in(up, UART_RX);
560         (void) serial_in(up, UART_IIR);
561         (void) serial_in(up, UART_MSR);
562
563         /*
564          * Now, initialize the UART
565          */
566         serial_out(up, UART_LCR, UART_LCR_WLEN8);
567         spin_lock_irqsave(&up->port.lock, flags);
568         /*
569          * Most PC uarts need OUT2 raised to enable interrupts.
570          */
571         up->port.mctrl |= TIOCM_OUT2;
572         serial_omap_set_mctrl(&up->port, up->port.mctrl);
573         spin_unlock_irqrestore(&up->port.lock, flags);
574
575         up->msr_saved_flags = 0;
576         if (up->use_dma) {
577                 free_page((unsigned long)up->port.state->xmit.buf);
578                 up->port.state->xmit.buf = dma_alloc_coherent(NULL,
579                         UART_XMIT_SIZE,
580                         (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
581                         0);
582                 init_timer(&(up->uart_dma.rx_timer));
583                 up->uart_dma.rx_timer.function = serial_omap_rxdma_poll;
584                 up->uart_dma.rx_timer.data = up->port.line;
585                 /* Currently the buffer size is 4KB. Can increase it */
586                 up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
587                         up->uart_dma.rx_buf_size,
588                         (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
589         }
590         /*
591          * Finally, enable interrupts. Note: Modem status interrupts
592          * are set via set_termios(), which will be occurring imminently
593          * anyway, so we don't enable them here.
594          */
595         up->ier = UART_IER_RLSI | UART_IER_RDI;
596         serial_out(up, UART_IER, up->ier);
597
598         /* Enable module level wake up */
599         serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
600
601         pm_runtime_mark_last_busy(&up->pdev->dev);
602         pm_runtime_put_autosuspend(&up->pdev->dev);
603         up->port_activity = jiffies;
604         return 0;
605 }
606
607 static void serial_omap_shutdown(struct uart_port *port)
608 {
609         struct uart_omap_port *up = (struct uart_omap_port *)port;
610         unsigned long flags = 0;
611
612         dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
613
614         pm_runtime_get_sync(&up->pdev->dev);
615         /*
616          * Disable interrupts from this port
617          */
618         up->ier = 0;
619         serial_out(up, UART_IER, 0);
620
621         spin_lock_irqsave(&up->port.lock, flags);
622         up->port.mctrl &= ~TIOCM_OUT2;
623         serial_omap_set_mctrl(&up->port, up->port.mctrl);
624         spin_unlock_irqrestore(&up->port.lock, flags);
625
626         /*
627          * Disable break condition and FIFOs
628          */
629         serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
630         serial_omap_clear_fifos(up);
631
632         /*
633          * Read data port to reset things, and then free the irq
634          */
635         if (serial_in(up, UART_LSR) & UART_LSR_DR)
636                 (void) serial_in(up, UART_RX);
637         if (up->use_dma) {
638                 dma_free_coherent(up->port.dev,
639                         UART_XMIT_SIZE, up->port.state->xmit.buf,
640                         up->uart_dma.tx_buf_dma_phys);
641                 up->port.state->xmit.buf = NULL;
642                 serial_omap_stop_rx(port);
643                 dma_free_coherent(up->port.dev,
644                         up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
645                         up->uart_dma.rx_buf_dma_phys);
646                 up->uart_dma.rx_buf = NULL;
647         }
648
649         pm_runtime_put(&up->pdev->dev);
650         free_irq(up->port.irq, up);
651 }
652
653 static inline void
654 serial_omap_configure_xonxoff
655                 (struct uart_omap_port *up, struct ktermios *termios)
656 {
657         up->lcr = serial_in(up, UART_LCR);
658         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
659         up->efr = serial_in(up, UART_EFR);
660         serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
661
662         serial_out(up, UART_XON1, termios->c_cc[VSTART]);
663         serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
664
665         /* clear SW control mode bits */
666         up->efr &= OMAP_UART_SW_CLR;
667
668         /*
669          * IXON Flag:
670          * Enable XON/XOFF flow control on output.
671          * Transmit XON1, XOFF1
672          */
673         if (termios->c_iflag & IXON)
674                 up->efr |= OMAP_UART_SW_TX;
675
676         /*
677          * IXOFF Flag:
678          * Enable XON/XOFF flow control on input.
679          * Receiver compares XON1, XOFF1.
680          */
681         if (termios->c_iflag & IXOFF)
682                 up->efr |= OMAP_UART_SW_RX;
683
684         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
685         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
686
687         up->mcr = serial_in(up, UART_MCR);
688
689         /*
690          * IXANY Flag:
691          * Enable any character to restart output.
692          * Operation resumes after receiving any
693          * character after recognition of the XOFF character
694          */
695         if (termios->c_iflag & IXANY)
696                 up->mcr |= UART_MCR_XONANY;
697
698         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
699         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
700         serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
701         /* Enable special char function UARTi.EFR_REG[5] and
702          * load the new software flow control mode IXON or IXOFF
703          * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
704          */
705         serial_out(up, UART_EFR, up->efr | UART_EFR_SCD);
706         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
707
708         serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
709         serial_out(up, UART_LCR, up->lcr);
710 }
711
712 static void serial_omap_uart_qos_work(struct work_struct *work)
713 {
714         struct uart_omap_port *up = container_of(work, struct uart_omap_port,
715                                                 qos_work);
716
717         pm_qos_update_request(&up->pm_qos_request, up->latency);
718 }
719
720 static void
721 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
722                         struct ktermios *old)
723 {
724         struct uart_omap_port *up = (struct uart_omap_port *)port;
725         unsigned char cval = 0;
726         unsigned char efr = 0;
727         unsigned long flags = 0;
728         unsigned int baud, quot;
729
730         switch (termios->c_cflag & CSIZE) {
731         case CS5:
732                 cval = UART_LCR_WLEN5;
733                 break;
734         case CS6:
735                 cval = UART_LCR_WLEN6;
736                 break;
737         case CS7:
738                 cval = UART_LCR_WLEN7;
739                 break;
740         default:
741         case CS8:
742                 cval = UART_LCR_WLEN8;
743                 break;
744         }
745
746         if (termios->c_cflag & CSTOPB)
747                 cval |= UART_LCR_STOP;
748         if (termios->c_cflag & PARENB)
749                 cval |= UART_LCR_PARITY;
750         if (!(termios->c_cflag & PARODD))
751                 cval |= UART_LCR_EPAR;
752
753         /*
754          * Ask the core to calculate the divisor for us.
755          */
756
757         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
758         quot = serial_omap_get_divisor(port, baud);
759
760         /* calculate wakeup latency constraint */
761         up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
762         up->latency = up->calc_latency;
763         schedule_work(&up->qos_work);
764
765         up->dll = quot & 0xff;
766         up->dlh = quot >> 8;
767         up->mdr1 = UART_OMAP_MDR1_DISABLE;
768
769         up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
770                         UART_FCR_ENABLE_FIFO;
771         if (up->use_dma)
772                 up->fcr |= UART_FCR_DMA_SELECT;
773
774         /*
775          * Ok, we're now changing the port state. Do it with
776          * interrupts disabled.
777          */
778         pm_runtime_get_sync(&up->pdev->dev);
779         spin_lock_irqsave(&up->port.lock, flags);
780
781         /*
782          * Update the per-port timeout.
783          */
784         uart_update_timeout(port, termios->c_cflag, baud);
785
786         up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
787         if (termios->c_iflag & INPCK)
788                 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
789         if (termios->c_iflag & (BRKINT | PARMRK))
790                 up->port.read_status_mask |= UART_LSR_BI;
791
792         /*
793          * Characters to ignore
794          */
795         up->port.ignore_status_mask = 0;
796         if (termios->c_iflag & IGNPAR)
797                 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
798         if (termios->c_iflag & IGNBRK) {
799                 up->port.ignore_status_mask |= UART_LSR_BI;
800                 /*
801                  * If we're ignoring parity and break indicators,
802                  * ignore overruns too (for real raw support).
803                  */
804                 if (termios->c_iflag & IGNPAR)
805                         up->port.ignore_status_mask |= UART_LSR_OE;
806         }
807
808         /*
809          * ignore all characters if CREAD is not set
810          */
811         if ((termios->c_cflag & CREAD) == 0)
812                 up->port.ignore_status_mask |= UART_LSR_DR;
813
814         /*
815          * Modem status interrupts
816          */
817         up->ier &= ~UART_IER_MSI;
818         if (UART_ENABLE_MS(&up->port, termios->c_cflag))
819                 up->ier |= UART_IER_MSI;
820         serial_out(up, UART_IER, up->ier);
821         serial_out(up, UART_LCR, cval);         /* reset DLAB */
822         up->lcr = cval;
823         up->scr = OMAP_UART_SCR_TX_EMPTY;
824
825         /* FIFOs and DMA Settings */
826
827         /* FCR can be changed only when the
828          * baud clock is not running
829          * DLL_REG and DLH_REG set to 0.
830          */
831         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
832         serial_out(up, UART_DLL, 0);
833         serial_out(up, UART_DLM, 0);
834         serial_out(up, UART_LCR, 0);
835
836         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
837
838         up->efr = serial_in(up, UART_EFR);
839         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
840
841         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
842         up->mcr = serial_in(up, UART_MCR);
843         serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
844         /* FIFO ENABLE, DMA MODE */
845
846         up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
847
848         if (up->use_dma) {
849                 serial_out(up, UART_TI752_TLR, 0);
850                 up->scr |= UART_FCR_TRIGGER_4;
851         } else {
852                 /* Set receive FIFO threshold to 1 byte */
853                 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
854                 up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT);
855         }
856
857         serial_out(up, UART_FCR, up->fcr);
858         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
859
860         serial_out(up, UART_OMAP_SCR, up->scr);
861
862         serial_out(up, UART_EFR, up->efr);
863         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
864         serial_out(up, UART_MCR, up->mcr);
865
866         /* Protocol, Baud Rate, and Interrupt Settings */
867
868         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
869                 serial_omap_mdr1_errataset(up, up->mdr1);
870         else
871                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
872
873         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
874
875         up->efr = serial_in(up, UART_EFR);
876         serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
877
878         serial_out(up, UART_LCR, 0);
879         serial_out(up, UART_IER, 0);
880         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
881
882         serial_out(up, UART_DLL, up->dll);      /* LS of divisor */
883         serial_out(up, UART_DLM, up->dlh);      /* MS of divisor */
884
885         serial_out(up, UART_LCR, 0);
886         serial_out(up, UART_IER, up->ier);
887         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
888
889         serial_out(up, UART_EFR, up->efr);
890         serial_out(up, UART_LCR, cval);
891
892         if (baud > 230400 && baud != 3000000)
893                 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
894         else
895                 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
896
897         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
898                 serial_omap_mdr1_errataset(up, up->mdr1);
899         else
900                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
901
902         /* Hardware Flow Control Configuration */
903
904         if (termios->c_cflag & CRTSCTS) {
905                 efr |= (UART_EFR_CTS | UART_EFR_RTS);
906                 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
907
908                 up->mcr = serial_in(up, UART_MCR);
909                 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
910
911                 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
912                 up->efr = serial_in(up, UART_EFR);
913                 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
914
915                 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
916                 serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
917                 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
918                 serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
919                 serial_out(up, UART_LCR, cval);
920         }
921
922         serial_omap_set_mctrl(&up->port, up->port.mctrl);
923         /* Software Flow Control Configuration */
924         serial_omap_configure_xonxoff(up, termios);
925
926         spin_unlock_irqrestore(&up->port.lock, flags);
927         pm_runtime_put(&up->pdev->dev);
928         dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
929 }
930
931 static void
932 serial_omap_pm(struct uart_port *port, unsigned int state,
933                unsigned int oldstate)
934 {
935         struct uart_omap_port *up = (struct uart_omap_port *)port;
936         unsigned char efr;
937
938         dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
939
940         pm_runtime_get_sync(&up->pdev->dev);
941         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
942         efr = serial_in(up, UART_EFR);
943         serial_out(up, UART_EFR, efr | UART_EFR_ECB);
944         serial_out(up, UART_LCR, 0);
945
946         serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
947         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
948         serial_out(up, UART_EFR, efr);
949         serial_out(up, UART_LCR, 0);
950
951         if (!device_may_wakeup(&up->pdev->dev)) {
952                 if (!state)
953                         pm_runtime_forbid(&up->pdev->dev);
954                 else
955                         pm_runtime_allow(&up->pdev->dev);
956         }
957
958         pm_runtime_put(&up->pdev->dev);
959 }
960
961 static void serial_omap_release_port(struct uart_port *port)
962 {
963         dev_dbg(port->dev, "serial_omap_release_port+\n");
964 }
965
966 static int serial_omap_request_port(struct uart_port *port)
967 {
968         dev_dbg(port->dev, "serial_omap_request_port+\n");
969         return 0;
970 }
971
972 static void serial_omap_config_port(struct uart_port *port, int flags)
973 {
974         struct uart_omap_port *up = (struct uart_omap_port *)port;
975
976         dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
977                                                         up->port.line);
978         up->port.type = PORT_OMAP;
979 }
980
981 static int
982 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
983 {
984         /* we don't want the core code to modify any port params */
985         dev_dbg(port->dev, "serial_omap_verify_port+\n");
986         return -EINVAL;
987 }
988
989 static const char *
990 serial_omap_type(struct uart_port *port)
991 {
992         struct uart_omap_port *up = (struct uart_omap_port *)port;
993
994         dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
995         return up->name;
996 }
997
998 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
999
1000 static inline void wait_for_xmitr(struct uart_omap_port *up)
1001 {
1002         unsigned int status, tmout = 10000;
1003
1004         /* Wait up to 10ms for the character(s) to be sent. */
1005         do {
1006                 status = serial_in(up, UART_LSR);
1007
1008                 if (status & UART_LSR_BI)
1009                         up->lsr_break_flag = UART_LSR_BI;
1010
1011                 if (--tmout == 0)
1012                         break;
1013                 udelay(1);
1014         } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1015
1016         /* Wait up to 1s for flow control if necessary */
1017         if (up->port.flags & UPF_CONS_FLOW) {
1018                 tmout = 1000000;
1019                 for (tmout = 1000000; tmout; tmout--) {
1020                         unsigned int msr = serial_in(up, UART_MSR);
1021
1022                         up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1023                         if (msr & UART_MSR_CTS)
1024                                 break;
1025
1026                         udelay(1);
1027                 }
1028         }
1029 }
1030
1031 #ifdef CONFIG_CONSOLE_POLL
1032
1033 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1034 {
1035         struct uart_omap_port *up = (struct uart_omap_port *)port;
1036
1037         pm_runtime_get_sync(&up->pdev->dev);
1038         wait_for_xmitr(up);
1039         serial_out(up, UART_TX, ch);
1040         pm_runtime_put(&up->pdev->dev);
1041 }
1042
1043 static int serial_omap_poll_get_char(struct uart_port *port)
1044 {
1045         struct uart_omap_port *up = (struct uart_omap_port *)port;
1046         unsigned int status;
1047
1048         pm_runtime_get_sync(&up->pdev->dev);
1049         status = serial_in(up, UART_LSR);
1050         if (!(status & UART_LSR_DR))
1051                 return NO_POLL_CHAR;
1052
1053         status = serial_in(up, UART_RX);
1054         pm_runtime_put(&up->pdev->dev);
1055         return status;
1056 }
1057
1058 #endif /* CONFIG_CONSOLE_POLL */
1059
1060 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1061
1062 static struct uart_omap_port *serial_omap_console_ports[4];
1063
1064 static struct uart_driver serial_omap_reg;
1065
1066 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1067 {
1068         struct uart_omap_port *up = (struct uart_omap_port *)port;
1069
1070         wait_for_xmitr(up);
1071         serial_out(up, UART_TX, ch);
1072 }
1073
1074 static void
1075 serial_omap_console_write(struct console *co, const char *s,
1076                 unsigned int count)
1077 {
1078         struct uart_omap_port *up = serial_omap_console_ports[co->index];
1079         unsigned long flags;
1080         unsigned int ier;
1081         int locked = 1;
1082
1083         pm_runtime_get_sync(&up->pdev->dev);
1084
1085         local_irq_save(flags);
1086         if (up->port.sysrq)
1087                 locked = 0;
1088         else if (oops_in_progress)
1089                 locked = spin_trylock(&up->port.lock);
1090         else
1091                 spin_lock(&up->port.lock);
1092
1093         /*
1094          * First save the IER then disable the interrupts
1095          */
1096         ier = serial_in(up, UART_IER);
1097         serial_out(up, UART_IER, 0);
1098
1099         uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1100
1101         /*
1102          * Finally, wait for transmitter to become empty
1103          * and restore the IER
1104          */
1105         wait_for_xmitr(up);
1106         serial_out(up, UART_IER, ier);
1107         /*
1108          * The receive handling will happen properly because the
1109          * receive ready bit will still be set; it is not cleared
1110          * on read.  However, modem control will not, we must
1111          * call it if we have saved something in the saved flags
1112          * while processing with interrupts off.
1113          */
1114         if (up->msr_saved_flags)
1115                 check_modem_status(up);
1116
1117         pm_runtime_mark_last_busy(&up->pdev->dev);
1118         pm_runtime_put_autosuspend(&up->pdev->dev);
1119         if (locked)
1120                 spin_unlock(&up->port.lock);
1121         local_irq_restore(flags);
1122 }
1123
1124 static int __init
1125 serial_omap_console_setup(struct console *co, char *options)
1126 {
1127         struct uart_omap_port *up;
1128         int baud = 115200;
1129         int bits = 8;
1130         int parity = 'n';
1131         int flow = 'n';
1132
1133         if (serial_omap_console_ports[co->index] == NULL)
1134                 return -ENODEV;
1135         up = serial_omap_console_ports[co->index];
1136
1137         if (options)
1138                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1139
1140         return uart_set_options(&up->port, co, baud, parity, bits, flow);
1141 }
1142
1143 static struct console serial_omap_console = {
1144         .name           = OMAP_SERIAL_NAME,
1145         .write          = serial_omap_console_write,
1146         .device         = uart_console_device,
1147         .setup          = serial_omap_console_setup,
1148         .flags          = CON_PRINTBUFFER,
1149         .index          = -1,
1150         .data           = &serial_omap_reg,
1151 };
1152
1153 static void serial_omap_add_console_port(struct uart_omap_port *up)
1154 {
1155         serial_omap_console_ports[up->port.line] = up;
1156 }
1157
1158 #define OMAP_CONSOLE    (&serial_omap_console)
1159
1160 #else
1161
1162 #define OMAP_CONSOLE    NULL
1163
1164 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1165 {}
1166
1167 #endif
1168
1169 static struct uart_ops serial_omap_pops = {
1170         .tx_empty       = serial_omap_tx_empty,
1171         .set_mctrl      = serial_omap_set_mctrl,
1172         .get_mctrl      = serial_omap_get_mctrl,
1173         .stop_tx        = serial_omap_stop_tx,
1174         .start_tx       = serial_omap_start_tx,
1175         .stop_rx        = serial_omap_stop_rx,
1176         .enable_ms      = serial_omap_enable_ms,
1177         .break_ctl      = serial_omap_break_ctl,
1178         .startup        = serial_omap_startup,
1179         .shutdown       = serial_omap_shutdown,
1180         .set_termios    = serial_omap_set_termios,
1181         .pm             = serial_omap_pm,
1182         .type           = serial_omap_type,
1183         .release_port   = serial_omap_release_port,
1184         .request_port   = serial_omap_request_port,
1185         .config_port    = serial_omap_config_port,
1186         .verify_port    = serial_omap_verify_port,
1187 #ifdef CONFIG_CONSOLE_POLL
1188         .poll_put_char  = serial_omap_poll_put_char,
1189         .poll_get_char  = serial_omap_poll_get_char,
1190 #endif
1191 };
1192
1193 static struct uart_driver serial_omap_reg = {
1194         .owner          = THIS_MODULE,
1195         .driver_name    = "OMAP-SERIAL",
1196         .dev_name       = OMAP_SERIAL_NAME,
1197         .nr             = OMAP_MAX_HSUART_PORTS,
1198         .cons           = OMAP_CONSOLE,
1199 };
1200
1201 #ifdef CONFIG_PM_SLEEP
1202 static int serial_omap_suspend(struct device *dev)
1203 {
1204         struct uart_omap_port *up = dev_get_drvdata(dev);
1205
1206         if (up) {
1207                 uart_suspend_port(&serial_omap_reg, &up->port);
1208                 flush_work(&up->qos_work);
1209         }
1210
1211         return 0;
1212 }
1213
1214 static int serial_omap_resume(struct device *dev)
1215 {
1216         struct uart_omap_port *up = dev_get_drvdata(dev);
1217
1218         if (up)
1219                 uart_resume_port(&serial_omap_reg, &up->port);
1220         return 0;
1221 }
1222 #endif
1223
1224 static void serial_omap_rxdma_poll(unsigned long uart_no)
1225 {
1226         struct uart_omap_port *up = ui[uart_no];
1227         unsigned int curr_dma_pos, curr_transmitted_size;
1228         int ret = 0;
1229
1230         curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
1231         if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
1232                              (curr_dma_pos == 0)) {
1233                 if (jiffies_to_msecs(jiffies - up->port_activity) <
1234                                                 up->uart_dma.rx_timeout) {
1235                         mod_timer(&up->uart_dma.rx_timer, jiffies +
1236                                 usecs_to_jiffies(up->uart_dma.rx_poll_rate));
1237                 } else {
1238                         serial_omap_stop_rxdma(up);
1239                         up->ier |= (UART_IER_RDI | UART_IER_RLSI);
1240                         serial_out(up, UART_IER, up->ier);
1241                 }
1242                 return;
1243         }
1244
1245         curr_transmitted_size = curr_dma_pos -
1246                                         up->uart_dma.prev_rx_dma_pos;
1247         up->port.icount.rx += curr_transmitted_size;
1248         tty_insert_flip_string(up->port.state->port.tty,
1249                         up->uart_dma.rx_buf +
1250                         (up->uart_dma.prev_rx_dma_pos -
1251                         up->uart_dma.rx_buf_dma_phys),
1252                         curr_transmitted_size);
1253         tty_flip_buffer_push(up->port.state->port.tty);
1254         up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
1255         if (up->uart_dma.rx_buf_size +
1256                         up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
1257                 ret = serial_omap_start_rxdma(up);
1258                 if (ret < 0) {
1259                         serial_omap_stop_rxdma(up);
1260                         up->ier |= (UART_IER_RDI | UART_IER_RLSI);
1261                         serial_out(up, UART_IER, up->ier);
1262                 }
1263         } else  {
1264                 mod_timer(&up->uart_dma.rx_timer, jiffies +
1265                         usecs_to_jiffies(up->uart_dma.rx_poll_rate));
1266         }
1267         up->port_activity = jiffies;
1268 }
1269
1270 static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
1271 {
1272         return;
1273 }
1274
1275 static int serial_omap_start_rxdma(struct uart_omap_port *up)
1276 {
1277         int ret = 0;
1278
1279         if (up->uart_dma.rx_dma_channel == -1) {
1280                 pm_runtime_get_sync(&up->pdev->dev);
1281                 ret = omap_request_dma(up->uart_dma.uart_dma_rx,
1282                                 "UART Rx DMA",
1283                                 (void *)uart_rx_dma_callback, up,
1284                                 &(up->uart_dma.rx_dma_channel));
1285                 if (ret < 0)
1286                         return ret;
1287
1288                 omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
1289                                 OMAP_DMA_AMODE_CONSTANT,
1290                                 up->uart_dma.uart_base, 0, 0);
1291                 omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
1292                                 OMAP_DMA_AMODE_POST_INC,
1293                                 up->uart_dma.rx_buf_dma_phys, 0, 0);
1294                 omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
1295                                 OMAP_DMA_DATA_TYPE_S8,
1296                                 up->uart_dma.rx_buf_size, 1,
1297                                 OMAP_DMA_SYNC_ELEMENT,
1298                                 up->uart_dma.uart_dma_rx, 0);
1299         }
1300         up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
1301         /* FIXME: Cache maintenance needed here? */
1302         omap_start_dma(up->uart_dma.rx_dma_channel);
1303         mod_timer(&up->uart_dma.rx_timer, jiffies +
1304                                 usecs_to_jiffies(up->uart_dma.rx_poll_rate));
1305         up->uart_dma.rx_dma_used = true;
1306         return ret;
1307 }
1308
1309 static void serial_omap_continue_tx(struct uart_omap_port *up)
1310 {
1311         struct circ_buf *xmit = &up->port.state->xmit;
1312         unsigned int start = up->uart_dma.tx_buf_dma_phys
1313                         + (xmit->tail & (UART_XMIT_SIZE - 1));
1314
1315         if (uart_circ_empty(xmit))
1316                 return;
1317
1318         up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
1319         /*
1320          * It is a circular buffer. See if the buffer has wounded back.
1321          * If yes it will have to be transferred in two separate dma
1322          * transfers
1323          */
1324         if (start + up->uart_dma.tx_buf_size >=
1325                         up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
1326                 up->uart_dma.tx_buf_size =
1327                         (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
1328         omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
1329                                 OMAP_DMA_AMODE_CONSTANT,
1330                                 up->uart_dma.uart_base, 0, 0);
1331         omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
1332                                 OMAP_DMA_AMODE_POST_INC, start, 0, 0);
1333         omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
1334                                 OMAP_DMA_DATA_TYPE_S8,
1335                                 up->uart_dma.tx_buf_size, 1,
1336                                 OMAP_DMA_SYNC_ELEMENT,
1337                                 up->uart_dma.uart_dma_tx, 0);
1338         /* FIXME: Cache maintenance needed here? */
1339         omap_start_dma(up->uart_dma.tx_dma_channel);
1340 }
1341
1342 static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
1343 {
1344         struct uart_omap_port *up = (struct uart_omap_port *)data;
1345         struct circ_buf *xmit = &up->port.state->xmit;
1346
1347         xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
1348                         (UART_XMIT_SIZE - 1);
1349         up->port.icount.tx += up->uart_dma.tx_buf_size;
1350
1351         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1352                 uart_write_wakeup(&up->port);
1353
1354         if (uart_circ_empty(xmit)) {
1355                 spin_lock(&(up->uart_dma.tx_lock));
1356                 serial_omap_stop_tx(&up->port);
1357                 up->uart_dma.tx_dma_used = false;
1358                 spin_unlock(&(up->uart_dma.tx_lock));
1359         } else {
1360                 omap_stop_dma(up->uart_dma.tx_dma_channel);
1361                 serial_omap_continue_tx(up);
1362         }
1363         up->port_activity = jiffies;
1364         return;
1365 }
1366
1367 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1368 {
1369         u32 mvr, scheme;
1370         u16 revision, major, minor;
1371
1372         mvr = serial_in(up, UART_OMAP_MVER);
1373
1374         /* Check revision register scheme */
1375         scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1376
1377         switch (scheme) {
1378         case 0: /* Legacy Scheme: OMAP2/3 */
1379                 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1380                 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1381                                         OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1382                 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1383                 break;
1384         case 1:
1385                 /* New Scheme: OMAP4+ */
1386                 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1387                 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1388                                         OMAP_UART_MVR_MAJ_SHIFT;
1389                 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1390                 break;
1391         default:
1392                 dev_warn(&up->pdev->dev,
1393                         "Unknown %s revision, defaulting to highest\n",
1394                         up->name);
1395                 /* highest possible revision */
1396                 major = 0xff;
1397                 minor = 0xff;
1398         }
1399
1400         /* normalize revision for the driver */
1401         revision = UART_BUILD_REVISION(major, minor);
1402
1403         switch (revision) {
1404         case OMAP_UART_REV_46:
1405                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1406                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1407                 break;
1408         case OMAP_UART_REV_52:
1409                 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1410                                 UART_ERRATA_i291_DMA_FORCEIDLE);
1411                 break;
1412         case OMAP_UART_REV_63:
1413                 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1414                 break;
1415         default:
1416                 break;
1417         }
1418 }
1419
1420 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1421 {
1422         struct omap_uart_port_info *omap_up_info;
1423
1424         omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1425         if (!omap_up_info)
1426                 return NULL; /* out of memory */
1427
1428         of_property_read_u32(dev->of_node, "clock-frequency",
1429                                          &omap_up_info->uartclk);
1430         return omap_up_info;
1431 }
1432
1433 static int serial_omap_probe(struct platform_device *pdev)
1434 {
1435         struct uart_omap_port   *up;
1436         struct resource         *mem, *irq, *dma_tx, *dma_rx;
1437         struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
1438         int ret = -ENOSPC;
1439
1440         if (pdev->dev.of_node)
1441                 omap_up_info = of_get_uart_port_info(&pdev->dev);
1442
1443         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1444         if (!mem) {
1445                 dev_err(&pdev->dev, "no mem resource?\n");
1446                 return -ENODEV;
1447         }
1448
1449         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1450         if (!irq) {
1451                 dev_err(&pdev->dev, "no irq resource?\n");
1452                 return -ENODEV;
1453         }
1454
1455         if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
1456                                 pdev->dev.driver->name)) {
1457                 dev_err(&pdev->dev, "memory region already claimed\n");
1458                 return -EBUSY;
1459         }
1460
1461         dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1462         if (!dma_rx)
1463                 return -ENXIO;
1464
1465         dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1466         if (!dma_tx)
1467                 return -ENXIO;
1468
1469         up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1470         if (!up)
1471                 return -ENOMEM;
1472
1473         up->pdev = pdev;
1474         up->port.dev = &pdev->dev;
1475         up->port.type = PORT_OMAP;
1476         up->port.iotype = UPIO_MEM;
1477         up->port.irq = irq->start;
1478
1479         up->port.regshift = 2;
1480         up->port.fifosize = 64;
1481         up->port.ops = &serial_omap_pops;
1482
1483         if (pdev->dev.of_node)
1484                 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
1485         else
1486                 up->port.line = pdev->id;
1487
1488         if (up->port.line < 0) {
1489                 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1490                                                                 up->port.line);
1491                 ret = -ENODEV;
1492                 goto err_port_line;
1493         }
1494
1495         sprintf(up->name, "OMAP UART%d", up->port.line);
1496         up->port.mapbase = mem->start;
1497         up->port.membase = devm_ioremap(&pdev->dev, mem->start,
1498                                                 resource_size(mem));
1499         if (!up->port.membase) {
1500                 dev_err(&pdev->dev, "can't ioremap UART\n");
1501                 ret = -ENOMEM;
1502                 goto err_ioremap;
1503         }
1504
1505         up->port.flags = omap_up_info->flags;
1506         up->port.uartclk = omap_up_info->uartclk;
1507         if (!up->port.uartclk) {
1508                 up->port.uartclk = DEFAULT_CLK_SPEED;
1509                 dev_warn(&pdev->dev, "No clock speed specified: using default:"
1510                                                 "%d\n", DEFAULT_CLK_SPEED);
1511         }
1512         up->uart_dma.uart_base = mem->start;
1513
1514         if (omap_up_info->dma_enabled) {
1515                 up->uart_dma.uart_dma_tx = dma_tx->start;
1516                 up->uart_dma.uart_dma_rx = dma_rx->start;
1517                 up->use_dma = 1;
1518                 up->uart_dma.rx_buf_size = omap_up_info->dma_rx_buf_size;
1519                 up->uart_dma.rx_timeout = omap_up_info->dma_rx_timeout;
1520                 up->uart_dma.rx_poll_rate = omap_up_info->dma_rx_poll_rate;
1521                 spin_lock_init(&(up->uart_dma.tx_lock));
1522                 spin_lock_init(&(up->uart_dma.rx_lock));
1523                 up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
1524                 up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
1525         }
1526
1527         up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1528         up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1529         pm_qos_add_request(&up->pm_qos_request,
1530                 PM_QOS_CPU_DMA_LATENCY, up->latency);
1531         serial_omap_uart_wq = create_singlethread_workqueue(up->name);
1532         INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1533
1534         pm_runtime_use_autosuspend(&pdev->dev);
1535         pm_runtime_set_autosuspend_delay(&pdev->dev,
1536                         omap_up_info->autosuspend_timeout);
1537
1538         pm_runtime_irq_safe(&pdev->dev);
1539         pm_runtime_enable(&pdev->dev);
1540         pm_runtime_get_sync(&pdev->dev);
1541
1542         omap_serial_fill_features_erratas(up);
1543
1544         ui[up->port.line] = up;
1545         serial_omap_add_console_port(up);
1546
1547         ret = uart_add_one_port(&serial_omap_reg, &up->port);
1548         if (ret != 0)
1549                 goto err_add_port;
1550
1551         pm_runtime_put(&pdev->dev);
1552         platform_set_drvdata(pdev, up);
1553         return 0;
1554
1555 err_add_port:
1556         pm_runtime_put(&pdev->dev);
1557         pm_runtime_disable(&pdev->dev);
1558 err_ioremap:
1559 err_port_line:
1560         dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1561                                 pdev->id, __func__, ret);
1562         return ret;
1563 }
1564
1565 static int serial_omap_remove(struct platform_device *dev)
1566 {
1567         struct uart_omap_port *up = platform_get_drvdata(dev);
1568
1569         if (up) {
1570                 pm_runtime_disable(&up->pdev->dev);
1571                 uart_remove_one_port(&serial_omap_reg, &up->port);
1572                 pm_qos_remove_request(&up->pm_qos_request);
1573         }
1574
1575         platform_set_drvdata(dev, NULL);
1576         return 0;
1577 }
1578
1579 /*
1580  * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1581  * The access to uart register after MDR1 Access
1582  * causes UART to corrupt data.
1583  *
1584  * Need a delay =
1585  * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1586  * give 10 times as much
1587  */
1588 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1589 {
1590         u8 timeout = 255;
1591
1592         serial_out(up, UART_OMAP_MDR1, mdr1);
1593         udelay(2);
1594         serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1595                         UART_FCR_CLEAR_RCVR);
1596         /*
1597          * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1598          * TX_FIFO_E bit is 1.
1599          */
1600         while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1601                                 (UART_LSR_THRE | UART_LSR_DR))) {
1602                 timeout--;
1603                 if (!timeout) {
1604                         /* Should *never* happen. we warn and carry on */
1605                         dev_crit(&up->pdev->dev, "Errata i202: timedout %x\n",
1606                                                 serial_in(up, UART_LSR));
1607                         break;
1608                 }
1609                 udelay(1);
1610         }
1611 }
1612
1613 #ifdef CONFIG_PM_RUNTIME
1614 static void serial_omap_restore_context(struct uart_omap_port *up)
1615 {
1616         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1617                 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1618         else
1619                 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1620
1621         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1622         serial_out(up, UART_EFR, UART_EFR_ECB);
1623         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1624         serial_out(up, UART_IER, 0x0);
1625         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1626         serial_out(up, UART_DLL, up->dll);
1627         serial_out(up, UART_DLM, up->dlh);
1628         serial_out(up, UART_LCR, 0x0); /* Operational mode */
1629         serial_out(up, UART_IER, up->ier);
1630         serial_out(up, UART_FCR, up->fcr);
1631         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1632         serial_out(up, UART_MCR, up->mcr);
1633         serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1634         serial_out(up, UART_OMAP_SCR, up->scr);
1635         serial_out(up, UART_EFR, up->efr);
1636         serial_out(up, UART_LCR, up->lcr);
1637         if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1638                 serial_omap_mdr1_errataset(up, up->mdr1);
1639         else
1640                 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1641 }
1642
1643 static int serial_omap_runtime_suspend(struct device *dev)
1644 {
1645         struct uart_omap_port *up = dev_get_drvdata(dev);
1646         struct omap_uart_port_info *pdata = dev->platform_data;
1647
1648         if (!up)
1649                 return -EINVAL;
1650
1651         if (!pdata || !pdata->enable_wakeup)
1652                 return 0;
1653
1654         if (pdata->get_context_loss_count)
1655                 up->context_loss_cnt = pdata->get_context_loss_count(dev);
1656
1657         if (device_may_wakeup(dev)) {
1658                 if (!up->wakeups_enabled) {
1659                         pdata->enable_wakeup(up->pdev, true);
1660                         up->wakeups_enabled = true;
1661                 }
1662         } else {
1663                 if (up->wakeups_enabled) {
1664                         pdata->enable_wakeup(up->pdev, false);
1665                         up->wakeups_enabled = false;
1666                 }
1667         }
1668
1669         /* Errata i291 */
1670         if (up->use_dma && pdata->set_forceidle &&
1671                         (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE))
1672                 pdata->set_forceidle(up->pdev);
1673
1674         up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1675         schedule_work(&up->qos_work);
1676
1677         return 0;
1678 }
1679
1680 static int serial_omap_runtime_resume(struct device *dev)
1681 {
1682         struct uart_omap_port *up = dev_get_drvdata(dev);
1683         struct omap_uart_port_info *pdata = dev->platform_data;
1684
1685         if (up && pdata) {
1686                 if (pdata->get_context_loss_count) {
1687                         u32 loss_cnt = pdata->get_context_loss_count(dev);
1688
1689                         if (up->context_loss_cnt != loss_cnt)
1690                                 serial_omap_restore_context(up);
1691                 }
1692
1693                 /* Errata i291 */
1694                 if (up->use_dma && pdata->set_noidle &&
1695                                 (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE))
1696                         pdata->set_noidle(up->pdev);
1697
1698                 up->latency = up->calc_latency;
1699                 schedule_work(&up->qos_work);
1700         }
1701
1702         return 0;
1703 }
1704 #endif
1705
1706 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1707         SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1708         SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1709                                 serial_omap_runtime_resume, NULL)
1710 };
1711
1712 #if defined(CONFIG_OF)
1713 static const struct of_device_id omap_serial_of_match[] = {
1714         { .compatible = "ti,omap2-uart" },
1715         { .compatible = "ti,omap3-uart" },
1716         { .compatible = "ti,omap4-uart" },
1717         {},
1718 };
1719 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1720 #endif
1721
1722 static struct platform_driver serial_omap_driver = {
1723         .probe          = serial_omap_probe,
1724         .remove         = serial_omap_remove,
1725         .driver         = {
1726                 .name   = DRIVER_NAME,
1727                 .pm     = &serial_omap_dev_pm_ops,
1728                 .of_match_table = of_match_ptr(omap_serial_of_match),
1729         },
1730 };
1731
1732 static int __init serial_omap_init(void)
1733 {
1734         int ret;
1735
1736         ret = uart_register_driver(&serial_omap_reg);
1737         if (ret != 0)
1738                 return ret;
1739         ret = platform_driver_register(&serial_omap_driver);
1740         if (ret != 0)
1741                 uart_unregister_driver(&serial_omap_reg);
1742         return ret;
1743 }
1744
1745 static void __exit serial_omap_exit(void)
1746 {
1747         platform_driver_unregister(&serial_omap_driver);
1748         uart_unregister_driver(&serial_omap_reg);
1749 }
1750
1751 module_init(serial_omap_init);
1752 module_exit(serial_omap_exit);
1753
1754 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1755 MODULE_LICENSE("GPL");
1756 MODULE_AUTHOR("Texas Instruments Inc");