1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Driver for OMAP-UART controller.
4 * Based on drivers/serial/8250.c
5 *
6 * Copyright (C) 2010 Texas Instruments.
7 *
8 * Authors:
9 * Govindraj R <govindraj.raja@ti.com>
10 * Thara Gopinath <thara@ti.com>
11 *
12 * Note: This driver is made separate from 8250 driver as we cannot
13 * over load 8250 driver with omap platform specific configuration for
14 * features like DMA, it makes easier to implement features like DMA and
15 * hardware flow control and software flow control configuration with
16 * this driver as required for the omap-platform.
17 */
18
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/console.h>
22 #include <linux/serial_reg.h>
23 #include <linux/delay.h>
24 #include <linux/slab.h>
25 #include <linux/tty.h>
26 #include <linux/tty_flip.h>
27 #include <linux/platform_device.h>
28 #include <linux/io.h>
29 #include <linux/clk.h>
30 #include <linux/serial_core.h>
31 #include <linux/irq.h>
32 #include <linux/pm_runtime.h>
33 #include <linux/pm_wakeirq.h>
34 #include <linux/of.h>
35 #include <linux/of_irq.h>
36 #include <linux/gpio/consumer.h>
37 #include <linux/platform_data/serial-omap.h>
38
39 #define OMAP_MAX_HSUART_PORTS 10
40
41 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
42
43 #define OMAP_UART_REV_42 0x0402
44 #define OMAP_UART_REV_46 0x0406
45 #define OMAP_UART_REV_52 0x0502
46 #define OMAP_UART_REV_63 0x0603
47
48 #define OMAP_UART_TX_WAKEUP_EN BIT(7)
49
50 /* Feature flags */
51 #define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0)
52
53 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0)
54 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1)
55
56 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */
57
58 /* SCR register bitmasks */
59 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7)
60 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6)
61 #define OMAP_UART_SCR_TX_EMPTY (1 << 3)
62
63 /* FCR register bitmasks */
64 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6)
65 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4)
66
67 /* MVR register bitmasks */
68 #define OMAP_UART_MVR_SCHEME_SHIFT 30
69
70 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0
71 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4
72 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f
73
74 #define OMAP_UART_MVR_MAJ_MASK 0x700
75 #define OMAP_UART_MVR_MAJ_SHIFT 8
76 #define OMAP_UART_MVR_MIN_MASK 0x3f
77
78 #define OMAP_UART_DMA_CH_FREE -1
79
80 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
81 #define OMAP_MODE13X_SPEED 230400
82
83 /* WER = 0x7F
84 * Enable module level wakeup in WER reg
85 */
86 #define OMAP_UART_WER_MOD_WKUP 0x7F
87
88 /* Enable XON/XOFF flow control on output */
89 #define OMAP_UART_SW_TX 0x08
90
91 /* Enable XON/XOFF flow control on input */
92 #define OMAP_UART_SW_RX 0x02
93
94 #define OMAP_UART_SW_CLR 0xF0
95
96 #define OMAP_UART_TCR_TRIG 0x0F
97
98 struct uart_omap_dma {
99 u8 uart_dma_tx;
100 u8 uart_dma_rx;
101 int rx_dma_channel;
102 int tx_dma_channel;
103 dma_addr_t rx_buf_dma_phys;
104 dma_addr_t tx_buf_dma_phys;
105 unsigned int uart_base;
106 /*
107 * Buffer for rx dma. It is not required for tx because the buffer
108 * comes from port structure.
109 */
110 unsigned char *rx_buf;
111 unsigned int prev_rx_dma_pos;
112 int tx_buf_size;
113 int tx_dma_used;
114 int rx_dma_used;
115 spinlock_t tx_lock;
116 spinlock_t rx_lock;
117 /* timer to poll activity on rx dma */
118 struct timer_list rx_timer;
119 unsigned int rx_buf_size;
120 unsigned int rx_poll_rate;
121 unsigned int rx_timeout;
122 };
123
124 struct uart_omap_port {
125 struct uart_port port;
126 struct uart_omap_dma uart_dma;
127 struct device *dev;
128 int wakeirq;
129
130 unsigned char ier;
131 unsigned char lcr;
132 unsigned char mcr;
133 unsigned char fcr;
134 unsigned char efr;
135 unsigned char dll;
136 unsigned char dlh;
137 unsigned char mdr1;
138 unsigned char scr;
139 unsigned char wer;
140
141 int use_dma;
142 /*
143 * Some bits in registers are cleared on a read, so they must
144 * be saved whenever the register is read, but the bits will not
145 * be immediately processed.
146 */
147 unsigned int lsr_break_flag;
148 unsigned char msr_saved_flags;
149 char name[20];
150 unsigned long port_activity;
151 int context_loss_cnt;
152 u32 errata;
153 u32 features;
154
155 struct gpio_desc *rts_gpiod;
156
157 struct pm_qos_request pm_qos_request;
158 u32 latency;
159 u32 calc_latency;
160 struct work_struct qos_work;
161 bool is_suspending;
162
163 unsigned int rs485_tx_filter_count;
164 };
165
166 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
167
168 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
169
170 /* Forward declaration of functions */
171 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
172
serial_in(struct uart_omap_port * up,int offset)173 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
174 {
175 offset <<= up->port.regshift;
176 return readw(up->port.membase + offset);
177 }
178
serial_out(struct uart_omap_port * up,int offset,int value)179 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
180 {
181 offset <<= up->port.regshift;
182 writew(value, up->port.membase + offset);
183 }
184
serial_omap_clear_fifos(struct uart_omap_port * up)185 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
186 {
187 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
188 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
189 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
190 serial_out(up, UART_FCR, 0);
191 }
192
193 #ifdef CONFIG_PM
serial_omap_get_context_loss_count(struct uart_omap_port * up)194 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
195 {
196 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
197
198 if (!pdata || !pdata->get_context_loss_count)
199 return -EINVAL;
200
201 return pdata->get_context_loss_count(up->dev);
202 }
203
204 /* REVISIT: Remove this when omap3 boots in device tree only mode */
serial_omap_enable_wakeup(struct uart_omap_port * up,bool enable)205 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
206 {
207 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
208
209 if (!pdata || !pdata->enable_wakeup)
210 return;
211
212 pdata->enable_wakeup(up->dev, enable);
213 }
214 #endif /* CONFIG_PM */
215
216 /*
217 * Calculate the absolute difference between the desired and actual baud
218 * rate for the given mode.
219 */
calculate_baud_abs_diff(struct uart_port * port,unsigned int baud,unsigned int mode)220 static inline int calculate_baud_abs_diff(struct uart_port *port,
221 unsigned int baud, unsigned int mode)
222 {
223 unsigned int n = port->uartclk / (mode * baud);
224 int abs_diff;
225
226 if (n == 0)
227 n = 1;
228
229 abs_diff = baud - (port->uartclk / (mode * n));
230 if (abs_diff < 0)
231 abs_diff = -abs_diff;
232
233 return abs_diff;
234 }
235
236 /*
237 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X
238 * @port: uart port info
239 * @baud: baudrate for which mode needs to be determined
240 *
241 * Returns true if baud rate is MODE16X and false if MODE13X
242 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values,
243 * and Error Rates" determines modes not for all common baud rates.
244 * E.g. for 1000000 baud rate mode must be 16x, but according to that
245 * table it's determined as 13x.
246 */
247 static bool
serial_omap_baud_is_mode16(struct uart_port * port,unsigned int baud)248 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
249 {
250 int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13);
251 int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16);
252
253 return (abs_diff_13 >= abs_diff_16);
254 }
255
256 /*
257 * serial_omap_get_divisor - calculate divisor value
258 * @port: uart port info
259 * @baud: baudrate for which divisor needs to be calculated.
260 */
261 static unsigned int
serial_omap_get_divisor(struct uart_port * port,unsigned int baud)262 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
263 {
264 unsigned int mode;
265
266 if (!serial_omap_baud_is_mode16(port, baud))
267 mode = 13;
268 else
269 mode = 16;
270 return port->uartclk/(mode * baud);
271 }
272
serial_omap_enable_ms(struct uart_port * port)273 static void serial_omap_enable_ms(struct uart_port *port)
274 {
275 struct uart_omap_port *up = to_uart_omap_port(port);
276
277 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
278
279 pm_runtime_get_sync(up->dev);
280 up->ier |= UART_IER_MSI;
281 serial_out(up, UART_IER, up->ier);
282 pm_runtime_mark_last_busy(up->dev);
283 pm_runtime_put_autosuspend(up->dev);
284 }
285
serial_omap_stop_tx(struct uart_port * port)286 static void serial_omap_stop_tx(struct uart_port *port)
287 {
288 struct uart_omap_port *up = to_uart_omap_port(port);
289 int res;
290
291 pm_runtime_get_sync(up->dev);
292
293 /* Handle RS-485 */
294 if (port->rs485.flags & SER_RS485_ENABLED) {
295 if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
296 /* THR interrupt is fired when both TX FIFO and TX
297 * shift register are empty. This means there's nothing
298 * left to transmit now, so make sure the THR interrupt
299 * is fired when TX FIFO is below the trigger level,
300 * disable THR interrupts and toggle the RS-485 GPIO
301 * data direction pin if needed.
302 */
303 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
304 serial_out(up, UART_OMAP_SCR, up->scr);
305 res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ?
306 1 : 0;
307 if (up->rts_gpiod &&
308 gpiod_get_value(up->rts_gpiod) != res) {
309 if (port->rs485.delay_rts_after_send > 0)
310 mdelay(
311 port->rs485.delay_rts_after_send);
312 gpiod_set_value(up->rts_gpiod, res);
313 }
314 } else {
315 /* We're asked to stop, but there's still stuff in the
316 * UART FIFO, so make sure the THR interrupt is fired
317 * when both TX FIFO and TX shift register are empty.
318 * The next THR interrupt (if no transmission is started
319 * in the meantime) will indicate the end of a
320 * transmission. Therefore we _don't_ disable THR
321 * interrupts in this situation.
322 */
323 up->scr |= OMAP_UART_SCR_TX_EMPTY;
324 serial_out(up, UART_OMAP_SCR, up->scr);
325 return;
326 }
327 }
328
329 if (up->ier & UART_IER_THRI) {
330 up->ier &= ~UART_IER_THRI;
331 serial_out(up, UART_IER, up->ier);
332 }
333
334 pm_runtime_mark_last_busy(up->dev);
335 pm_runtime_put_autosuspend(up->dev);
336 }
337
serial_omap_stop_rx(struct uart_port * port)338 static void serial_omap_stop_rx(struct uart_port *port)
339 {
340 struct uart_omap_port *up = to_uart_omap_port(port);
341
342 pm_runtime_get_sync(up->dev);
343 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
344 up->port.read_status_mask &= ~UART_LSR_DR;
345 serial_out(up, UART_IER, up->ier);
346 pm_runtime_mark_last_busy(up->dev);
347 pm_runtime_put_autosuspend(up->dev);
348 }
349
transmit_chars(struct uart_omap_port * up,unsigned int lsr)350 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
351 {
352 struct circ_buf *xmit = &up->port.state->xmit;
353 int count;
354
355 if (up->port.x_char) {
356 serial_out(up, UART_TX, up->port.x_char);
357 up->port.icount.tx++;
358 up->port.x_char = 0;
359 if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
360 !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
361 up->rs485_tx_filter_count++;
362
363 return;
364 }
365 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
366 serial_omap_stop_tx(&up->port);
367 return;
368 }
369 count = up->port.fifosize / 4;
370 do {
371 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
372 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
373 up->port.icount.tx++;
374 if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
375 !(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
376 up->rs485_tx_filter_count++;
377
378 if (uart_circ_empty(xmit))
379 break;
380 } while (--count > 0);
381
382 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
383 uart_write_wakeup(&up->port);
384
385 if (uart_circ_empty(xmit))
386 serial_omap_stop_tx(&up->port);
387 }
388
serial_omap_enable_ier_thri(struct uart_omap_port * up)389 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
390 {
391 if (!(up->ier & UART_IER_THRI)) {
392 up->ier |= UART_IER_THRI;
393 serial_out(up, UART_IER, up->ier);
394 }
395 }
396
serial_omap_start_tx(struct uart_port * port)397 static void serial_omap_start_tx(struct uart_port *port)
398 {
399 struct uart_omap_port *up = to_uart_omap_port(port);
400 int res;
401
402 pm_runtime_get_sync(up->dev);
403
404 /* Handle RS-485 */
405 if (port->rs485.flags & SER_RS485_ENABLED) {
406 /* Fire THR interrupts when FIFO is below trigger level */
407 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
408 serial_out(up, UART_OMAP_SCR, up->scr);
409
410 /* if rts not already enabled */
411 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
412 if (up->rts_gpiod && gpiod_get_value(up->rts_gpiod) != res) {
413 gpiod_set_value(up->rts_gpiod, res);
414 if (port->rs485.delay_rts_before_send > 0)
415 mdelay(port->rs485.delay_rts_before_send);
416 }
417 }
418
419 if ((port->rs485.flags & SER_RS485_ENABLED) &&
420 !(port->rs485.flags & SER_RS485_RX_DURING_TX))
421 up->rs485_tx_filter_count = 0;
422
423 serial_omap_enable_ier_thri(up);
424 pm_runtime_mark_last_busy(up->dev);
425 pm_runtime_put_autosuspend(up->dev);
426 }
427
serial_omap_throttle(struct uart_port * port)428 static void serial_omap_throttle(struct uart_port *port)
429 {
430 struct uart_omap_port *up = to_uart_omap_port(port);
431 unsigned long flags;
432
433 pm_runtime_get_sync(up->dev);
434 spin_lock_irqsave(&up->port.lock, flags);
435 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
436 serial_out(up, UART_IER, up->ier);
437 spin_unlock_irqrestore(&up->port.lock, flags);
438 pm_runtime_mark_last_busy(up->dev);
439 pm_runtime_put_autosuspend(up->dev);
440 }
441
serial_omap_unthrottle(struct uart_port * port)442 static void serial_omap_unthrottle(struct uart_port *port)
443 {
444 struct uart_omap_port *up = to_uart_omap_port(port);
445 unsigned long flags;
446
447 pm_runtime_get_sync(up->dev);
448 spin_lock_irqsave(&up->port.lock, flags);
449 up->ier |= UART_IER_RLSI | UART_IER_RDI;
450 serial_out(up, UART_IER, up->ier);
451 spin_unlock_irqrestore(&up->port.lock, flags);
452 pm_runtime_mark_last_busy(up->dev);
453 pm_runtime_put_autosuspend(up->dev);
454 }
455
check_modem_status(struct uart_omap_port * up)456 static unsigned int check_modem_status(struct uart_omap_port *up)
457 {
458 unsigned int status;
459
460 status = serial_in(up, UART_MSR);
461 status |= up->msr_saved_flags;
462 up->msr_saved_flags = 0;
463 if ((status & UART_MSR_ANY_DELTA) == 0)
464 return status;
465
466 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
467 up->port.state != NULL) {
468 if (status & UART_MSR_TERI)
469 up->port.icount.rng++;
470 if (status & UART_MSR_DDSR)
471 up->port.icount.dsr++;
472 if (status & UART_MSR_DDCD)
473 uart_handle_dcd_change
474 (&up->port, status & UART_MSR_DCD);
475 if (status & UART_MSR_DCTS)
476 uart_handle_cts_change
477 (&up->port, status & UART_MSR_CTS);
478 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
479 }
480
481 return status;
482 }
483
serial_omap_rlsi(struct uart_omap_port * up,unsigned int lsr)484 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
485 {
486 unsigned int flag;
487
488 /*
489 * Read one data character out to avoid stalling the receiver according
490 * to the table 23-246 of the omap4 TRM.
491 */
492 if (likely(lsr & UART_LSR_DR)) {
493 serial_in(up, UART_RX);
494 if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
495 !(up->port.rs485.flags & SER_RS485_RX_DURING_TX) &&
496 up->rs485_tx_filter_count)
497 up->rs485_tx_filter_count--;
498 }
499
500 up->port.icount.rx++;
501 flag = TTY_NORMAL;
502
503 if (lsr & UART_LSR_BI) {
504 flag = TTY_BREAK;
505 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
506 up->port.icount.brk++;
507 /*
508 * We do the SysRQ and SAK checking
509 * here because otherwise the break
510 * may get masked by ignore_status_mask
511 * or read_status_mask.
512 */
513 if (uart_handle_break(&up->port))
514 return;
515
516 }
517
518 if (lsr & UART_LSR_PE) {
519 flag = TTY_PARITY;
520 up->port.icount.parity++;
521 }
522
523 if (lsr & UART_LSR_FE) {
524 flag = TTY_FRAME;
525 up->port.icount.frame++;
526 }
527
528 if (lsr & UART_LSR_OE)
529 up->port.icount.overrun++;
530
531 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
532 if (up->port.line == up->port.cons->index) {
533 /* Recover the break flag from console xmit */
534 lsr |= up->lsr_break_flag;
535 }
536 #endif
537 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
538 }
539
serial_omap_rdi(struct uart_omap_port * up,unsigned int lsr)540 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
541 {
542 unsigned char ch = 0;
543 unsigned int flag;
544
545 if (!(lsr & UART_LSR_DR))
546 return;
547
548 ch = serial_in(up, UART_RX);
549 if ((up->port.rs485.flags & SER_RS485_ENABLED) &&
550 !(up->port.rs485.flags & SER_RS485_RX_DURING_TX) &&
551 up->rs485_tx_filter_count) {
552 up->rs485_tx_filter_count--;
553 return;
554 }
555
556 flag = TTY_NORMAL;
557 up->port.icount.rx++;
558
559 if (uart_handle_sysrq_char(&up->port, ch))
560 return;
561
562 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
563 }
564
565 /**
566 * serial_omap_irq() - This handles the interrupt from one port
567 * @irq: uart port irq number
568 * @dev_id: uart port info
569 */
serial_omap_irq(int irq,void * dev_id)570 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
571 {
572 struct uart_omap_port *up = dev_id;
573 unsigned int iir, lsr;
574 unsigned int type;
575 irqreturn_t ret = IRQ_NONE;
576 int max_count = 256;
577
578 spin_lock(&up->port.lock);
579 pm_runtime_get_sync(up->dev);
580
581 do {
582 iir = serial_in(up, UART_IIR);
583 if (iir & UART_IIR_NO_INT)
584 break;
585
586 ret = IRQ_HANDLED;
587 lsr = serial_in(up, UART_LSR);
588
589 /* extract IRQ type from IIR register */
590 type = iir & 0x3e;
591
592 switch (type) {
593 case UART_IIR_MSI:
594 check_modem_status(up);
595 break;
596 case UART_IIR_THRI:
597 transmit_chars(up, lsr);
598 break;
599 case UART_IIR_RX_TIMEOUT:
600 case UART_IIR_RDI:
601 serial_omap_rdi(up, lsr);
602 break;
603 case UART_IIR_RLSI:
604 serial_omap_rlsi(up, lsr);
605 break;
606 case UART_IIR_CTS_RTS_DSR:
607 /* simply try again */
608 break;
609 case UART_IIR_XOFF:
610 default:
611 break;
612 }
613 } while (max_count--);
614
615 spin_unlock(&up->port.lock);
616
617 tty_flip_buffer_push(&up->port.state->port);
618
619 pm_runtime_mark_last_busy(up->dev);
620 pm_runtime_put_autosuspend(up->dev);
621 up->port_activity = jiffies;
622
623 return ret;
624 }
625
serial_omap_tx_empty(struct uart_port * port)626 static unsigned int serial_omap_tx_empty(struct uart_port *port)
627 {
628 struct uart_omap_port *up = to_uart_omap_port(port);
629 unsigned long flags = 0;
630 unsigned int ret = 0;
631
632 pm_runtime_get_sync(up->dev);
633 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
634 spin_lock_irqsave(&up->port.lock, flags);
635 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
636 spin_unlock_irqrestore(&up->port.lock, flags);
637 pm_runtime_mark_last_busy(up->dev);
638 pm_runtime_put_autosuspend(up->dev);
639 return ret;
640 }
641
serial_omap_get_mctrl(struct uart_port * port)642 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
643 {
644 struct uart_omap_port *up = to_uart_omap_port(port);
645 unsigned int status;
646 unsigned int ret = 0;
647
648 pm_runtime_get_sync(up->dev);
649 status = check_modem_status(up);
650 pm_runtime_mark_last_busy(up->dev);
651 pm_runtime_put_autosuspend(up->dev);
652
653 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
654
655 if (status & UART_MSR_DCD)
656 ret |= TIOCM_CAR;
657 if (status & UART_MSR_RI)
658 ret |= TIOCM_RNG;
659 if (status & UART_MSR_DSR)
660 ret |= TIOCM_DSR;
661 if (status & UART_MSR_CTS)
662 ret |= TIOCM_CTS;
663 return ret;
664 }
665
serial_omap_set_mctrl(struct uart_port * port,unsigned int mctrl)666 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
667 {
668 struct uart_omap_port *up = to_uart_omap_port(port);
669 unsigned char mcr = 0, old_mcr, lcr;
670
671 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
672 if (mctrl & TIOCM_RTS)
673 mcr |= UART_MCR_RTS;
674 if (mctrl & TIOCM_DTR)
675 mcr |= UART_MCR_DTR;
676 if (mctrl & TIOCM_OUT1)
677 mcr |= UART_MCR_OUT1;
678 if (mctrl & TIOCM_OUT2)
679 mcr |= UART_MCR_OUT2;
680 if (mctrl & TIOCM_LOOP)
681 mcr |= UART_MCR_LOOP;
682
683 pm_runtime_get_sync(up->dev);
684 old_mcr = serial_in(up, UART_MCR);
685 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 |
686 UART_MCR_DTR | UART_MCR_RTS);
687 up->mcr = old_mcr | mcr;
688 serial_out(up, UART_MCR, up->mcr);
689
690 /* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */
691 lcr = serial_in(up, UART_LCR);
692 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
693 if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
694 up->efr |= UART_EFR_RTS;
695 else
696 up->efr &= ~UART_EFR_RTS;
697 serial_out(up, UART_EFR, up->efr);
698 serial_out(up, UART_LCR, lcr);
699
700 pm_runtime_mark_last_busy(up->dev);
701 pm_runtime_put_autosuspend(up->dev);
702 }
703
serial_omap_break_ctl(struct uart_port * port,int break_state)704 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
705 {
706 struct uart_omap_port *up = to_uart_omap_port(port);
707 unsigned long flags = 0;
708
709 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
710 pm_runtime_get_sync(up->dev);
711 spin_lock_irqsave(&up->port.lock, flags);
712 if (break_state == -1)
713 up->lcr |= UART_LCR_SBC;
714 else
715 up->lcr &= ~UART_LCR_SBC;
716 serial_out(up, UART_LCR, up->lcr);
717 spin_unlock_irqrestore(&up->port.lock, flags);
718 pm_runtime_mark_last_busy(up->dev);
719 pm_runtime_put_autosuspend(up->dev);
720 }
721
serial_omap_startup(struct uart_port * port)722 static int serial_omap_startup(struct uart_port *port)
723 {
724 struct uart_omap_port *up = to_uart_omap_port(port);
725 unsigned long flags = 0;
726 int retval;
727
728 /*
729 * Allocate the IRQ
730 */
731 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
732 up->name, up);
733 if (retval)
734 return retval;
735
736 /* Optional wake-up IRQ */
737 if (up->wakeirq) {
738 retval = dev_pm_set_dedicated_wake_irq(up->dev, up->wakeirq);
739 if (retval) {
740 free_irq(up->port.irq, up);
741 return retval;
742 }
743 }
744
745 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
746
747 pm_runtime_get_sync(up->dev);
748 /*
749 * Clear the FIFO buffers and disable them.
750 * (they will be reenabled in set_termios())
751 */
752 serial_omap_clear_fifos(up);
753
754 /*
755 * Clear the interrupt registers.
756 */
757 (void) serial_in(up, UART_LSR);
758 if (serial_in(up, UART_LSR) & UART_LSR_DR)
759 (void) serial_in(up, UART_RX);
760 (void) serial_in(up, UART_IIR);
761 (void) serial_in(up, UART_MSR);
762
763 /*
764 * Now, initialize the UART
765 */
766 serial_out(up, UART_LCR, UART_LCR_WLEN8);
767 spin_lock_irqsave(&up->port.lock, flags);
768 /*
769 * Most PC uarts need OUT2 raised to enable interrupts.
770 */
771 up->port.mctrl |= TIOCM_OUT2;
772 serial_omap_set_mctrl(&up->port, up->port.mctrl);
773 spin_unlock_irqrestore(&up->port.lock, flags);
774
775 up->msr_saved_flags = 0;
776 /*
777 * Finally, enable interrupts. Note: Modem status interrupts
778 * are set via set_termios(), which will be occurring imminently
779 * anyway, so we don't enable them here.
780 */
781 up->ier = UART_IER_RLSI | UART_IER_RDI;
782 serial_out(up, UART_IER, up->ier);
783
784 /* Enable module level wake up */
785 up->wer = OMAP_UART_WER_MOD_WKUP;
786 if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP)
787 up->wer |= OMAP_UART_TX_WAKEUP_EN;
788
789 serial_out(up, UART_OMAP_WER, up->wer);
790
791 pm_runtime_mark_last_busy(up->dev);
792 pm_runtime_put_autosuspend(up->dev);
793 up->port_activity = jiffies;
794 return 0;
795 }
796
serial_omap_shutdown(struct uart_port * port)797 static void serial_omap_shutdown(struct uart_port *port)
798 {
799 struct uart_omap_port *up = to_uart_omap_port(port);
800 unsigned long flags = 0;
801
802 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
803
804 pm_runtime_get_sync(up->dev);
805 /*
806 * Disable interrupts from this port
807 */
808 up->ier = 0;
809 serial_out(up, UART_IER, 0);
810
811 spin_lock_irqsave(&up->port.lock, flags);
812 up->port.mctrl &= ~TIOCM_OUT2;
813 serial_omap_set_mctrl(&up->port, up->port.mctrl);
814 spin_unlock_irqrestore(&up->port.lock, flags);
815
816 /*
817 * Disable break condition and FIFOs
818 */
819 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
820 serial_omap_clear_fifos(up);
821
822 /*
823 * Read data port to reset things, and then free the irq
824 */
825 if (serial_in(up, UART_LSR) & UART_LSR_DR)
826 (void) serial_in(up, UART_RX);
827
828 pm_runtime_mark_last_busy(up->dev);
829 pm_runtime_put_autosuspend(up->dev);
830 free_irq(up->port.irq, up);
831 dev_pm_clear_wake_irq(up->dev);
832 }
833
serial_omap_uart_qos_work(struct work_struct * work)834 static void serial_omap_uart_qos_work(struct work_struct *work)
835 {
836 struct uart_omap_port *up = container_of(work, struct uart_omap_port,
837 qos_work);
838
839 cpu_latency_qos_update_request(&up->pm_qos_request, up->latency);
840 }
841
842 static void
serial_omap_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)843 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
844 struct ktermios *old)
845 {
846 struct uart_omap_port *up = to_uart_omap_port(port);
847 unsigned char cval = 0;
848 unsigned long flags = 0;
849 unsigned int baud, quot;
850
851 switch (termios->c_cflag & CSIZE) {
852 case CS5:
853 cval = UART_LCR_WLEN5;
854 break;
855 case CS6:
856 cval = UART_LCR_WLEN6;
857 break;
858 case CS7:
859 cval = UART_LCR_WLEN7;
860 break;
861 default:
862 case CS8:
863 cval = UART_LCR_WLEN8;
864 break;
865 }
866
867 if (termios->c_cflag & CSTOPB)
868 cval |= UART_LCR_STOP;
869 if (termios->c_cflag & PARENB)
870 cval |= UART_LCR_PARITY;
871 if (!(termios->c_cflag & PARODD))
872 cval |= UART_LCR_EPAR;
873 if (termios->c_cflag & CMSPAR)
874 cval |= UART_LCR_SPAR;
875
876 /*
877 * Ask the core to calculate the divisor for us.
878 */
879
880 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
881 quot = serial_omap_get_divisor(port, baud);
882
883 /* calculate wakeup latency constraint */
884 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
885 up->latency = up->calc_latency;
886 schedule_work(&up->qos_work);
887
888 up->dll = quot & 0xff;
889 up->dlh = quot >> 8;
890 up->mdr1 = UART_OMAP_MDR1_DISABLE;
891
892 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
893 UART_FCR_ENABLE_FIFO;
894
895 /*
896 * Ok, we're now changing the port state. Do it with
897 * interrupts disabled.
898 */
899 pm_runtime_get_sync(up->dev);
900 spin_lock_irqsave(&up->port.lock, flags);
901
902 /*
903 * Update the per-port timeout.
904 */
905 uart_update_timeout(port, termios->c_cflag, baud);
906
907 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
908 if (termios->c_iflag & INPCK)
909 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
910 if (termios->c_iflag & (BRKINT | PARMRK))
911 up->port.read_status_mask |= UART_LSR_BI;
912
913 /*
914 * Characters to ignore
915 */
916 up->port.ignore_status_mask = 0;
917 if (termios->c_iflag & IGNPAR)
918 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
919 if (termios->c_iflag & IGNBRK) {
920 up->port.ignore_status_mask |= UART_LSR_BI;
921 /*
922 * If we're ignoring parity and break indicators,
923 * ignore overruns too (for real raw support).
924 */
925 if (termios->c_iflag & IGNPAR)
926 up->port.ignore_status_mask |= UART_LSR_OE;
927 }
928
929 /*
930 * ignore all characters if CREAD is not set
931 */
932 if ((termios->c_cflag & CREAD) == 0)
933 up->port.ignore_status_mask |= UART_LSR_DR;
934
935 /*
936 * Modem status interrupts
937 */
938 up->ier &= ~UART_IER_MSI;
939 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
940 up->ier |= UART_IER_MSI;
941 serial_out(up, UART_IER, up->ier);
942 serial_out(up, UART_LCR, cval); /* reset DLAB */
943 up->lcr = cval;
944 up->scr = 0;
945
946 /* FIFOs and DMA Settings */
947
948 /* FCR can be changed only when the
949 * baud clock is not running
950 * DLL_REG and DLH_REG set to 0.
951 */
952 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
953 serial_out(up, UART_DLL, 0);
954 serial_out(up, UART_DLM, 0);
955 serial_out(up, UART_LCR, 0);
956
957 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
958
959 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB;
960 up->efr &= ~UART_EFR_SCD;
961 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
962
963 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
964 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR;
965 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
966 /* FIFO ENABLE, DMA MODE */
967
968 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
969 /*
970 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK
971 * sets Enables the granularity of 1 for TRIGGER RX
972 * level. Along with setting RX FIFO trigger level
973 * to 1 (as noted below, 16 characters) and TLR[3:0]
974 * to zero this will result RX FIFO threshold level
975 * to 1 character, instead of 16 as noted in comment
976 * below.
977 */
978
979 /* Set receive FIFO threshold to 16 characters and
980 * transmit FIFO threshold to 32 spaces
981 */
982 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
983 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
984 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
985 UART_FCR_ENABLE_FIFO;
986
987 serial_out(up, UART_FCR, up->fcr);
988 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
989
990 serial_out(up, UART_OMAP_SCR, up->scr);
991
992 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */
993 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
994 serial_out(up, UART_MCR, up->mcr);
995 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
996 serial_out(up, UART_EFR, up->efr);
997 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
998
999 /* Protocol, Baud Rate, and Interrupt Settings */
1000
1001 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1002 serial_omap_mdr1_errataset(up, up->mdr1);
1003 else
1004 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1005
1006 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1007 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1008
1009 serial_out(up, UART_LCR, 0);
1010 serial_out(up, UART_IER, 0);
1011 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1012
1013 serial_out(up, UART_DLL, up->dll); /* LS of divisor */
1014 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */
1015
1016 serial_out(up, UART_LCR, 0);
1017 serial_out(up, UART_IER, up->ier);
1018 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1019
1020 serial_out(up, UART_EFR, up->efr);
1021 serial_out(up, UART_LCR, cval);
1022
1023 if (!serial_omap_baud_is_mode16(port, baud))
1024 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
1025 else
1026 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
1027
1028 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1029 serial_omap_mdr1_errataset(up, up->mdr1);
1030 else
1031 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1032
1033 /* Configure flow control */
1034 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1035
1036 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */
1037 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
1038 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
1039
1040 /* Enable access to TCR/TLR */
1041 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1042 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1043 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
1044
1045 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
1046
1047 up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
1048
1049 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
1050 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */
1051 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
1052 up->efr |= UART_EFR_CTS;
1053 } else {
1054 /* Disable AUTORTS and AUTOCTS */
1055 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
1056 }
1057
1058 if (up->port.flags & UPF_SOFT_FLOW) {
1059 /* clear SW control mode bits */
1060 up->efr &= OMAP_UART_SW_CLR;
1061
1062 /*
1063 * IXON Flag:
1064 * Enable XON/XOFF flow control on input.
1065 * Receiver compares XON1, XOFF1.
1066 */
1067 if (termios->c_iflag & IXON)
1068 up->efr |= OMAP_UART_SW_RX;
1069
1070 /*
1071 * IXOFF Flag:
1072 * Enable XON/XOFF flow control on output.
1073 * Transmit XON1, XOFF1
1074 */
1075 if (termios->c_iflag & IXOFF) {
1076 up->port.status |= UPSTAT_AUTOXOFF;
1077 up->efr |= OMAP_UART_SW_TX;
1078 }
1079
1080 /*
1081 * IXANY Flag:
1082 * Enable any character to restart output.
1083 * Operation resumes after receiving any
1084 * character after recognition of the XOFF character
1085 */
1086 if (termios->c_iflag & IXANY)
1087 up->mcr |= UART_MCR_XONANY;
1088 else
1089 up->mcr &= ~UART_MCR_XONANY;
1090 }
1091 serial_out(up, UART_MCR, up->mcr);
1092 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1093 serial_out(up, UART_EFR, up->efr);
1094 serial_out(up, UART_LCR, up->lcr);
1095
1096 serial_omap_set_mctrl(&up->port, up->port.mctrl);
1097
1098 spin_unlock_irqrestore(&up->port.lock, flags);
1099 pm_runtime_mark_last_busy(up->dev);
1100 pm_runtime_put_autosuspend(up->dev);
1101 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
1102 }
1103
1104 static void
serial_omap_pm(struct uart_port * port,unsigned int state,unsigned int oldstate)1105 serial_omap_pm(struct uart_port *port, unsigned int state,
1106 unsigned int oldstate)
1107 {
1108 struct uart_omap_port *up = to_uart_omap_port(port);
1109 unsigned char efr;
1110
1111 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
1112
1113 pm_runtime_get_sync(up->dev);
1114 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1115 efr = serial_in(up, UART_EFR);
1116 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
1117 serial_out(up, UART_LCR, 0);
1118
1119 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
1120 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1121 serial_out(up, UART_EFR, efr);
1122 serial_out(up, UART_LCR, 0);
1123
1124 pm_runtime_mark_last_busy(up->dev);
1125 pm_runtime_put_autosuspend(up->dev);
1126 }
1127
serial_omap_release_port(struct uart_port * port)1128 static void serial_omap_release_port(struct uart_port *port)
1129 {
1130 dev_dbg(port->dev, "serial_omap_release_port+\n");
1131 }
1132
serial_omap_request_port(struct uart_port * port)1133 static int serial_omap_request_port(struct uart_port *port)
1134 {
1135 dev_dbg(port->dev, "serial_omap_request_port+\n");
1136 return 0;
1137 }
1138
serial_omap_config_port(struct uart_port * port,int flags)1139 static void serial_omap_config_port(struct uart_port *port, int flags)
1140 {
1141 struct uart_omap_port *up = to_uart_omap_port(port);
1142
1143 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
1144 up->port.line);
1145 up->port.type = PORT_OMAP;
1146 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW;
1147 }
1148
1149 static int
serial_omap_verify_port(struct uart_port * port,struct serial_struct * ser)1150 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
1151 {
1152 /* we don't want the core code to modify any port params */
1153 dev_dbg(port->dev, "serial_omap_verify_port+\n");
1154 return -EINVAL;
1155 }
1156
1157 static const char *
serial_omap_type(struct uart_port * port)1158 serial_omap_type(struct uart_port *port)
1159 {
1160 struct uart_omap_port *up = to_uart_omap_port(port);
1161
1162 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1163 return up->name;
1164 }
1165
1166 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1167
wait_for_xmitr(struct uart_omap_port * up)1168 static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up)
1169 {
1170 unsigned int status, tmout = 10000;
1171
1172 /* Wait up to 10ms for the character(s) to be sent. */
1173 do {
1174 status = serial_in(up, UART_LSR);
1175
1176 if (status & UART_LSR_BI)
1177 up->lsr_break_flag = UART_LSR_BI;
1178
1179 if (--tmout == 0)
1180 break;
1181 udelay(1);
1182 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1183
1184 /* Wait up to 1s for flow control if necessary */
1185 if (up->port.flags & UPF_CONS_FLOW) {
1186 tmout = 1000000;
1187 for (tmout = 1000000; tmout; tmout--) {
1188 unsigned int msr = serial_in(up, UART_MSR);
1189
1190 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1191 if (msr & UART_MSR_CTS)
1192 break;
1193
1194 udelay(1);
1195 }
1196 }
1197 }
1198
1199 #ifdef CONFIG_CONSOLE_POLL
1200
serial_omap_poll_put_char(struct uart_port * port,unsigned char ch)1201 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1202 {
1203 struct uart_omap_port *up = to_uart_omap_port(port);
1204
1205 pm_runtime_get_sync(up->dev);
1206 wait_for_xmitr(up);
1207 serial_out(up, UART_TX, ch);
1208 pm_runtime_mark_last_busy(up->dev);
1209 pm_runtime_put_autosuspend(up->dev);
1210 }
1211
serial_omap_poll_get_char(struct uart_port * port)1212 static int serial_omap_poll_get_char(struct uart_port *port)
1213 {
1214 struct uart_omap_port *up = to_uart_omap_port(port);
1215 unsigned int status;
1216
1217 pm_runtime_get_sync(up->dev);
1218 status = serial_in(up, UART_LSR);
1219 if (!(status & UART_LSR_DR)) {
1220 status = NO_POLL_CHAR;
1221 goto out;
1222 }
1223
1224 status = serial_in(up, UART_RX);
1225
1226 out:
1227 pm_runtime_mark_last_busy(up->dev);
1228 pm_runtime_put_autosuspend(up->dev);
1229
1230 return status;
1231 }
1232
1233 #endif /* CONFIG_CONSOLE_POLL */
1234
1235 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1236
1237 #ifdef CONFIG_SERIAL_EARLYCON
omap_serial_early_in(struct uart_port * port,int offset)1238 static unsigned int omap_serial_early_in(struct uart_port *port, int offset)
1239 {
1240 offset <<= port->regshift;
1241 return readw(port->membase + offset);
1242 }
1243
omap_serial_early_out(struct uart_port * port,int offset,int value)1244 static void omap_serial_early_out(struct uart_port *port, int offset,
1245 int value)
1246 {
1247 offset <<= port->regshift;
1248 writew(value, port->membase + offset);
1249 }
1250
omap_serial_early_putc(struct uart_port * port,int c)1251 static void omap_serial_early_putc(struct uart_port *port, int c)
1252 {
1253 unsigned int status;
1254
1255 for (;;) {
1256 status = omap_serial_early_in(port, UART_LSR);
1257 if ((status & BOTH_EMPTY) == BOTH_EMPTY)
1258 break;
1259 cpu_relax();
1260 }
1261 omap_serial_early_out(port, UART_TX, c);
1262 }
1263
early_omap_serial_write(struct console * console,const char * s,unsigned int count)1264 static void early_omap_serial_write(struct console *console, const char *s,
1265 unsigned int count)
1266 {
1267 struct earlycon_device *device = console->data;
1268 struct uart_port *port = &device->port;
1269
1270 uart_console_write(port, s, count, omap_serial_early_putc);
1271 }
1272
early_omap_serial_setup(struct earlycon_device * device,const char * options)1273 static int __init early_omap_serial_setup(struct earlycon_device *device,
1274 const char *options)
1275 {
1276 struct uart_port *port = &device->port;
1277
1278 if (!(device->port.membase || device->port.iobase))
1279 return -ENODEV;
1280
1281 port->regshift = 2;
1282 device->con->write = early_omap_serial_write;
1283 return 0;
1284 }
1285
1286 OF_EARLYCON_DECLARE(omapserial, "ti,omap2-uart", early_omap_serial_setup);
1287 OF_EARLYCON_DECLARE(omapserial, "ti,omap3-uart", early_omap_serial_setup);
1288 OF_EARLYCON_DECLARE(omapserial, "ti,omap4-uart", early_omap_serial_setup);
1289 #endif /* CONFIG_SERIAL_EARLYCON */
1290
1291 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
1292
1293 static struct uart_driver serial_omap_reg;
1294
serial_omap_console_putchar(struct uart_port * port,int ch)1295 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1296 {
1297 struct uart_omap_port *up = to_uart_omap_port(port);
1298
1299 wait_for_xmitr(up);
1300 serial_out(up, UART_TX, ch);
1301 }
1302
1303 static void
serial_omap_console_write(struct console * co,const char * s,unsigned int count)1304 serial_omap_console_write(struct console *co, const char *s,
1305 unsigned int count)
1306 {
1307 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1308 unsigned long flags;
1309 unsigned int ier;
1310 int locked = 1;
1311
1312 pm_runtime_get_sync(up->dev);
1313
1314 local_irq_save(flags);
1315 if (up->port.sysrq)
1316 locked = 0;
1317 else if (oops_in_progress)
1318 locked = spin_trylock(&up->port.lock);
1319 else
1320 spin_lock(&up->port.lock);
1321
1322 /*
1323 * First save the IER then disable the interrupts
1324 */
1325 ier = serial_in(up, UART_IER);
1326 serial_out(up, UART_IER, 0);
1327
1328 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1329
1330 /*
1331 * Finally, wait for transmitter to become empty
1332 * and restore the IER
1333 */
1334 wait_for_xmitr(up);
1335 serial_out(up, UART_IER, ier);
1336 /*
1337 * The receive handling will happen properly because the
1338 * receive ready bit will still be set; it is not cleared
1339 * on read. However, modem control will not, we must
1340 * call it if we have saved something in the saved flags
1341 * while processing with interrupts off.
1342 */
1343 if (up->msr_saved_flags)
1344 check_modem_status(up);
1345
1346 pm_runtime_mark_last_busy(up->dev);
1347 pm_runtime_put_autosuspend(up->dev);
1348 if (locked)
1349 spin_unlock(&up->port.lock);
1350 local_irq_restore(flags);
1351 }
1352
1353 static int __init
serial_omap_console_setup(struct console * co,char * options)1354 serial_omap_console_setup(struct console *co, char *options)
1355 {
1356 struct uart_omap_port *up;
1357 int baud = 115200;
1358 int bits = 8;
1359 int parity = 'n';
1360 int flow = 'n';
1361
1362 if (serial_omap_console_ports[co->index] == NULL)
1363 return -ENODEV;
1364 up = serial_omap_console_ports[co->index];
1365
1366 if (options)
1367 uart_parse_options(options, &baud, &parity, &bits, &flow);
1368
1369 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1370 }
1371
1372 static struct console serial_omap_console = {
1373 .name = OMAP_SERIAL_NAME,
1374 .write = serial_omap_console_write,
1375 .device = uart_console_device,
1376 .setup = serial_omap_console_setup,
1377 .flags = CON_PRINTBUFFER,
1378 .index = -1,
1379 .data = &serial_omap_reg,
1380 };
1381
serial_omap_add_console_port(struct uart_omap_port * up)1382 static void serial_omap_add_console_port(struct uart_omap_port *up)
1383 {
1384 serial_omap_console_ports[up->port.line] = up;
1385 }
1386
1387 #define OMAP_CONSOLE (&serial_omap_console)
1388
1389 #else
1390
1391 #define OMAP_CONSOLE NULL
1392
serial_omap_add_console_port(struct uart_omap_port * up)1393 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1394 {}
1395
1396 #endif
1397
1398 /* Enable or disable the rs485 support */
1399 static int
serial_omap_config_rs485(struct uart_port * port,struct serial_rs485 * rs485)1400 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
1401 {
1402 struct uart_omap_port *up = to_uart_omap_port(port);
1403 unsigned int mode;
1404 int val;
1405
1406 pm_runtime_get_sync(up->dev);
1407
1408 /* Disable interrupts from this port */
1409 mode = up->ier;
1410 up->ier = 0;
1411 serial_out(up, UART_IER, 0);
1412
1413 /* Clamp the delays to [0, 100ms] */
1414 rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
1415 rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
1416
1417 /* store new config */
1418 port->rs485 = *rs485;
1419
1420 if (up->rts_gpiod) {
1421 /* enable / disable rts */
1422 val = (port->rs485.flags & SER_RS485_ENABLED) ?
1423 SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
1424 val = (port->rs485.flags & val) ? 1 : 0;
1425 gpiod_set_value(up->rts_gpiod, val);
1426 }
1427
1428 /* Enable interrupts */
1429 up->ier = mode;
1430 serial_out(up, UART_IER, up->ier);
1431
1432 /* If RS-485 is disabled, make sure the THR interrupt is fired when
1433 * TX FIFO is below the trigger level.
1434 */
1435 if (!(port->rs485.flags & SER_RS485_ENABLED) &&
1436 (up->scr & OMAP_UART_SCR_TX_EMPTY)) {
1437 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
1438 serial_out(up, UART_OMAP_SCR, up->scr);
1439 }
1440
1441 pm_runtime_mark_last_busy(up->dev);
1442 pm_runtime_put_autosuspend(up->dev);
1443
1444 return 0;
1445 }
1446
1447 static const struct uart_ops serial_omap_pops = {
1448 .tx_empty = serial_omap_tx_empty,
1449 .set_mctrl = serial_omap_set_mctrl,
1450 .get_mctrl = serial_omap_get_mctrl,
1451 .stop_tx = serial_omap_stop_tx,
1452 .start_tx = serial_omap_start_tx,
1453 .throttle = serial_omap_throttle,
1454 .unthrottle = serial_omap_unthrottle,
1455 .stop_rx = serial_omap_stop_rx,
1456 .enable_ms = serial_omap_enable_ms,
1457 .break_ctl = serial_omap_break_ctl,
1458 .startup = serial_omap_startup,
1459 .shutdown = serial_omap_shutdown,
1460 .set_termios = serial_omap_set_termios,
1461 .pm = serial_omap_pm,
1462 .type = serial_omap_type,
1463 .release_port = serial_omap_release_port,
1464 .request_port = serial_omap_request_port,
1465 .config_port = serial_omap_config_port,
1466 .verify_port = serial_omap_verify_port,
1467 #ifdef CONFIG_CONSOLE_POLL
1468 .poll_put_char = serial_omap_poll_put_char,
1469 .poll_get_char = serial_omap_poll_get_char,
1470 #endif
1471 };
1472
1473 static struct uart_driver serial_omap_reg = {
1474 .owner = THIS_MODULE,
1475 .driver_name = "OMAP-SERIAL",
1476 .dev_name = OMAP_SERIAL_NAME,
1477 .nr = OMAP_MAX_HSUART_PORTS,
1478 .cons = OMAP_CONSOLE,
1479 };
1480
1481 #ifdef CONFIG_PM_SLEEP
serial_omap_prepare(struct device * dev)1482 static int serial_omap_prepare(struct device *dev)
1483 {
1484 struct uart_omap_port *up = dev_get_drvdata(dev);
1485
1486 up->is_suspending = true;
1487
1488 return 0;
1489 }
1490
serial_omap_complete(struct device * dev)1491 static void serial_omap_complete(struct device *dev)
1492 {
1493 struct uart_omap_port *up = dev_get_drvdata(dev);
1494
1495 up->is_suspending = false;
1496 }
1497
serial_omap_suspend(struct device * dev)1498 static int serial_omap_suspend(struct device *dev)
1499 {
1500 struct uart_omap_port *up = dev_get_drvdata(dev);
1501
1502 uart_suspend_port(&serial_omap_reg, &up->port);
1503 flush_work(&up->qos_work);
1504
1505 if (device_may_wakeup(dev))
1506 serial_omap_enable_wakeup(up, true);
1507 else
1508 serial_omap_enable_wakeup(up, false);
1509
1510 return 0;
1511 }
1512
serial_omap_resume(struct device * dev)1513 static int serial_omap_resume(struct device *dev)
1514 {
1515 struct uart_omap_port *up = dev_get_drvdata(dev);
1516
1517 if (device_may_wakeup(dev))
1518 serial_omap_enable_wakeup(up, false);
1519
1520 uart_resume_port(&serial_omap_reg, &up->port);
1521
1522 return 0;
1523 }
1524 #else
1525 #define serial_omap_prepare NULL
1526 #define serial_omap_complete NULL
1527 #endif /* CONFIG_PM_SLEEP */
1528
omap_serial_fill_features_erratas(struct uart_omap_port * up)1529 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1530 {
1531 u32 mvr, scheme;
1532 u16 revision, major, minor;
1533
1534 mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
1535
1536 /* Check revision register scheme */
1537 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1538
1539 switch (scheme) {
1540 case 0: /* Legacy Scheme: OMAP2/3 */
1541 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1542 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1543 OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1544 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1545 break;
1546 case 1:
1547 /* New Scheme: OMAP4+ */
1548 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1549 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1550 OMAP_UART_MVR_MAJ_SHIFT;
1551 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1552 break;
1553 default:
1554 dev_warn(up->dev,
1555 "Unknown %s revision, defaulting to highest\n",
1556 up->name);
1557 /* highest possible revision */
1558 major = 0xff;
1559 minor = 0xff;
1560 }
1561
1562 /* normalize revision for the driver */
1563 revision = UART_BUILD_REVISION(major, minor);
1564
1565 switch (revision) {
1566 case OMAP_UART_REV_46:
1567 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1568 UART_ERRATA_i291_DMA_FORCEIDLE);
1569 break;
1570 case OMAP_UART_REV_52:
1571 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1572 UART_ERRATA_i291_DMA_FORCEIDLE);
1573 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1574 break;
1575 case OMAP_UART_REV_63:
1576 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1577 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1578 break;
1579 default:
1580 break;
1581 }
1582 }
1583
of_get_uart_port_info(struct device * dev)1584 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1585 {
1586 struct omap_uart_port_info *omap_up_info;
1587
1588 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1589 if (!omap_up_info)
1590 return NULL; /* out of memory */
1591
1592 of_property_read_u32(dev->of_node, "clock-frequency",
1593 &omap_up_info->uartclk);
1594
1595 omap_up_info->flags = UPF_BOOT_AUTOCONF;
1596
1597 return omap_up_info;
1598 }
1599
serial_omap_probe_rs485(struct uart_omap_port * up,struct device * dev)1600 static int serial_omap_probe_rs485(struct uart_omap_port *up,
1601 struct device *dev)
1602 {
1603 struct serial_rs485 *rs485conf = &up->port.rs485;
1604 struct device_node *np = dev->of_node;
1605 enum gpiod_flags gflags;
1606 int ret;
1607
1608 rs485conf->flags = 0;
1609 up->rts_gpiod = NULL;
1610
1611 if (!np)
1612 return 0;
1613
1614 ret = uart_get_rs485_mode(&up->port);
1615 if (ret)
1616 return ret;
1617
1618 if (of_property_read_bool(np, "rs485-rts-active-high")) {
1619 rs485conf->flags |= SER_RS485_RTS_ON_SEND;
1620 rs485conf->flags &= ~SER_RS485_RTS_AFTER_SEND;
1621 } else {
1622 rs485conf->flags &= ~SER_RS485_RTS_ON_SEND;
1623 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
1624 }
1625
1626 /* check for tx enable gpio */
1627 gflags = rs485conf->flags & SER_RS485_RTS_AFTER_SEND ?
1628 GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
1629 up->rts_gpiod = devm_gpiod_get_optional(dev, "rts", gflags);
1630 if (IS_ERR(up->rts_gpiod)) {
1631 ret = PTR_ERR(up->rts_gpiod);
1632 if (ret == -EPROBE_DEFER)
1633 return ret;
1634 /*
1635 * FIXME: the code historically ignored any other error than
1636 * -EPROBE_DEFER and just went on without GPIO.
1637 */
1638 up->rts_gpiod = NULL;
1639 } else {
1640 gpiod_set_consumer_name(up->rts_gpiod, "omap-serial");
1641 }
1642
1643 return 0;
1644 }
1645
serial_omap_probe(struct platform_device * pdev)1646 static int serial_omap_probe(struct platform_device *pdev)
1647 {
1648 struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
1649 struct uart_omap_port *up;
1650 struct resource *mem;
1651 void __iomem *base;
1652 int uartirq = 0;
1653 int wakeirq = 0;
1654 int ret;
1655
1656 /* The optional wakeirq may be specified in the board dts file */
1657 if (pdev->dev.of_node) {
1658 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1659 if (!uartirq)
1660 return -EPROBE_DEFER;
1661 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
1662 omap_up_info = of_get_uart_port_info(&pdev->dev);
1663 pdev->dev.platform_data = omap_up_info;
1664 } else {
1665 uartirq = platform_get_irq(pdev, 0);
1666 if (uartirq < 0)
1667 return -EPROBE_DEFER;
1668 }
1669
1670 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1671 if (!up)
1672 return -ENOMEM;
1673
1674 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1675 base = devm_ioremap_resource(&pdev->dev, mem);
1676 if (IS_ERR(base))
1677 return PTR_ERR(base);
1678
1679 up->dev = &pdev->dev;
1680 up->port.dev = &pdev->dev;
1681 up->port.type = PORT_OMAP;
1682 up->port.iotype = UPIO_MEM;
1683 up->port.irq = uartirq;
1684 up->port.regshift = 2;
1685 up->port.fifosize = 64;
1686 up->port.ops = &serial_omap_pops;
1687 up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_OMAP_CONSOLE);
1688
1689 if (pdev->dev.of_node)
1690 ret = of_alias_get_id(pdev->dev.of_node, "serial");
1691 else
1692 ret = pdev->id;
1693
1694 if (ret < 0) {
1695 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1696 ret);
1697 goto err_port_line;
1698 }
1699 up->port.line = ret;
1700
1701 if (up->port.line >= OMAP_MAX_HSUART_PORTS) {
1702 dev_err(&pdev->dev, "uart ID %d > MAX %d.\n", up->port.line,
1703 OMAP_MAX_HSUART_PORTS);
1704 ret = -ENXIO;
1705 goto err_port_line;
1706 }
1707
1708 up->wakeirq = wakeirq;
1709 if (!up->wakeirq)
1710 dev_info(up->port.dev, "no wakeirq for uart%d\n",
1711 up->port.line);
1712
1713 ret = serial_omap_probe_rs485(up, &pdev->dev);
1714 if (ret < 0)
1715 goto err_rs485;
1716
1717 sprintf(up->name, "OMAP UART%d", up->port.line);
1718 up->port.mapbase = mem->start;
1719 up->port.membase = base;
1720 up->port.flags = omap_up_info->flags;
1721 up->port.uartclk = omap_up_info->uartclk;
1722 up->port.rs485_config = serial_omap_config_rs485;
1723 if (!up->port.uartclk) {
1724 up->port.uartclk = DEFAULT_CLK_SPEED;
1725 dev_warn(&pdev->dev,
1726 "No clock speed specified: using default: %d\n",
1727 DEFAULT_CLK_SPEED);
1728 }
1729
1730 up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
1731 up->calc_latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
1732 cpu_latency_qos_add_request(&up->pm_qos_request, up->latency);
1733 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1734
1735 platform_set_drvdata(pdev, up);
1736 if (omap_up_info->autosuspend_timeout == 0)
1737 omap_up_info->autosuspend_timeout = -1;
1738
1739 device_init_wakeup(up->dev, true);
1740 pm_runtime_use_autosuspend(&pdev->dev);
1741 pm_runtime_set_autosuspend_delay(&pdev->dev,
1742 omap_up_info->autosuspend_timeout);
1743
1744 pm_runtime_irq_safe(&pdev->dev);
1745 pm_runtime_enable(&pdev->dev);
1746
1747 pm_runtime_get_sync(&pdev->dev);
1748
1749 omap_serial_fill_features_erratas(up);
1750
1751 ui[up->port.line] = up;
1752 serial_omap_add_console_port(up);
1753
1754 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1755 if (ret != 0)
1756 goto err_add_port;
1757
1758 pm_runtime_mark_last_busy(up->dev);
1759 pm_runtime_put_autosuspend(up->dev);
1760 return 0;
1761
1762 err_add_port:
1763 pm_runtime_dont_use_autosuspend(&pdev->dev);
1764 pm_runtime_put_sync(&pdev->dev);
1765 pm_runtime_disable(&pdev->dev);
1766 cpu_latency_qos_remove_request(&up->pm_qos_request);
1767 device_init_wakeup(up->dev, false);
1768 err_rs485:
1769 err_port_line:
1770 return ret;
1771 }
1772
serial_omap_remove(struct platform_device * dev)1773 static int serial_omap_remove(struct platform_device *dev)
1774 {
1775 struct uart_omap_port *up = platform_get_drvdata(dev);
1776
1777 pm_runtime_get_sync(up->dev);
1778
1779 uart_remove_one_port(&serial_omap_reg, &up->port);
1780
1781 pm_runtime_dont_use_autosuspend(up->dev);
1782 pm_runtime_put_sync(up->dev);
1783 pm_runtime_disable(up->dev);
1784 cpu_latency_qos_remove_request(&up->pm_qos_request);
1785 device_init_wakeup(&dev->dev, false);
1786
1787 return 0;
1788 }
1789
1790 /*
1791 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1792 * The access to uart register after MDR1 Access
1793 * causes UART to corrupt data.
1794 *
1795 * Need a delay =
1796 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1797 * give 10 times as much
1798 */
serial_omap_mdr1_errataset(struct uart_omap_port * up,u8 mdr1)1799 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1800 {
1801 u8 timeout = 255;
1802
1803 serial_out(up, UART_OMAP_MDR1, mdr1);
1804 udelay(2);
1805 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1806 UART_FCR_CLEAR_RCVR);
1807 /*
1808 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1809 * TX_FIFO_E bit is 1.
1810 */
1811 while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1812 (UART_LSR_THRE | UART_LSR_DR))) {
1813 timeout--;
1814 if (!timeout) {
1815 /* Should *never* happen. we warn and carry on */
1816 dev_crit(up->dev, "Errata i202: timedout %x\n",
1817 serial_in(up, UART_LSR));
1818 break;
1819 }
1820 udelay(1);
1821 }
1822 }
1823
1824 #ifdef CONFIG_PM
serial_omap_restore_context(struct uart_omap_port * up)1825 static void serial_omap_restore_context(struct uart_omap_port *up)
1826 {
1827 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1828 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1829 else
1830 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1831
1832 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1833 serial_out(up, UART_EFR, UART_EFR_ECB);
1834 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1835 serial_out(up, UART_IER, 0x0);
1836 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1837 serial_out(up, UART_DLL, up->dll);
1838 serial_out(up, UART_DLM, up->dlh);
1839 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1840 serial_out(up, UART_IER, up->ier);
1841 serial_out(up, UART_FCR, up->fcr);
1842 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1843 serial_out(up, UART_MCR, up->mcr);
1844 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1845 serial_out(up, UART_OMAP_SCR, up->scr);
1846 serial_out(up, UART_EFR, up->efr);
1847 serial_out(up, UART_LCR, up->lcr);
1848 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1849 serial_omap_mdr1_errataset(up, up->mdr1);
1850 else
1851 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1852 serial_out(up, UART_OMAP_WER, up->wer);
1853 }
1854
serial_omap_runtime_suspend(struct device * dev)1855 static int serial_omap_runtime_suspend(struct device *dev)
1856 {
1857 struct uart_omap_port *up = dev_get_drvdata(dev);
1858
1859 if (!up)
1860 return -EINVAL;
1861
1862 /*
1863 * When using 'no_console_suspend', the console UART must not be
1864 * suspended. Since driver suspend is managed by runtime suspend,
1865 * preventing runtime suspend (by returning error) will keep device
1866 * active during suspend.
1867 */
1868 if (up->is_suspending && !console_suspend_enabled &&
1869 uart_console(&up->port))
1870 return -EBUSY;
1871
1872 up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1873
1874 serial_omap_enable_wakeup(up, true);
1875
1876 up->latency = PM_QOS_CPU_LATENCY_DEFAULT_VALUE;
1877 schedule_work(&up->qos_work);
1878
1879 return 0;
1880 }
1881
serial_omap_runtime_resume(struct device * dev)1882 static int serial_omap_runtime_resume(struct device *dev)
1883 {
1884 struct uart_omap_port *up = dev_get_drvdata(dev);
1885
1886 int loss_cnt = serial_omap_get_context_loss_count(up);
1887
1888 serial_omap_enable_wakeup(up, false);
1889
1890 if (loss_cnt < 0) {
1891 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
1892 loss_cnt);
1893 serial_omap_restore_context(up);
1894 } else if (up->context_loss_cnt != loss_cnt) {
1895 serial_omap_restore_context(up);
1896 }
1897 up->latency = up->calc_latency;
1898 schedule_work(&up->qos_work);
1899
1900 return 0;
1901 }
1902 #endif
1903
1904 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1905 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1906 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1907 serial_omap_runtime_resume, NULL)
1908 .prepare = serial_omap_prepare,
1909 .complete = serial_omap_complete,
1910 };
1911
1912 #if defined(CONFIG_OF)
1913 static const struct of_device_id omap_serial_of_match[] = {
1914 { .compatible = "ti,omap2-uart" },
1915 { .compatible = "ti,omap3-uart" },
1916 { .compatible = "ti,omap4-uart" },
1917 {},
1918 };
1919 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1920 #endif
1921
1922 static struct platform_driver serial_omap_driver = {
1923 .probe = serial_omap_probe,
1924 .remove = serial_omap_remove,
1925 .driver = {
1926 .name = OMAP_SERIAL_DRIVER_NAME,
1927 .pm = &serial_omap_dev_pm_ops,
1928 .of_match_table = of_match_ptr(omap_serial_of_match),
1929 },
1930 };
1931
serial_omap_init(void)1932 static int __init serial_omap_init(void)
1933 {
1934 int ret;
1935
1936 ret = uart_register_driver(&serial_omap_reg);
1937 if (ret != 0)
1938 return ret;
1939 ret = platform_driver_register(&serial_omap_driver);
1940 if (ret != 0)
1941 uart_unregister_driver(&serial_omap_reg);
1942 return ret;
1943 }
1944
serial_omap_exit(void)1945 static void __exit serial_omap_exit(void)
1946 {
1947 platform_driver_unregister(&serial_omap_driver);
1948 uart_unregister_driver(&serial_omap_reg);
1949 }
1950
1951 module_init(serial_omap_init);
1952 module_exit(serial_omap_exit);
1953
1954 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1955 MODULE_LICENSE("GPL");
1956 MODULE_AUTHOR("Texas Instruments Inc");
1957