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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / tty / serial / sirfsoc_uart.c
blobb7bfe24d4ebca6f930bcaa3058b09f017561dfb5
1 /*
2 * Driver for CSR SiRFprimaII onboard UARTs.
3 *
4 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
5 *
6 * Licensed under GPLv2 or later.
7 */
8
9 #include <linux/module.h>
10 #include <linux/ioport.h>
11 #include <linux/platform_device.h>
12 #include <linux/init.h>
13 #include <linux/sysrq.h>
14 #include <linux/console.h>
15 #include <linux/tty.h>
16 #include <linux/tty_flip.h>
17 #include <linux/serial_core.h>
18 #include <linux/serial.h>
19 #include <linux/clk.h>
20 #include <linux/of.h>
21 #include <linux/slab.h>
22 #include <linux/io.h>
23 #include <linux/of_gpio.h>
24 #include <linux/dmaengine.h>
25 #include <linux/dma-direction.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/sirfsoc_dma.h>
28 #include <asm/irq.h>
29 #include <asm/mach/irq.h>
30
31 #include "sirfsoc_uart.h"
32
33 static unsigned int
34 sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count);
35 static unsigned int
36 sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count);
37 static struct uart_driver sirfsoc_uart_drv;
38
39 static void sirfsoc_uart_tx_dma_complete_callback(void *param);
40 static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port);
41 static void sirfsoc_uart_rx_dma_complete_callback(void *param);
42 static const struct sirfsoc_baudrate_to_regv baudrate_to_regv[] = {
43 {4000000, 2359296},
44 {3500000, 1310721},
45 {3000000, 1572865},
46 {2500000, 1245186},
47 {2000000, 1572866},
48 {1500000, 1245188},
49 {1152000, 1638404},
50 {1000000, 1572869},
51 {921600, 1114120},
52 {576000, 1245196},
53 {500000, 1245198},
54 {460800, 1572876},
55 {230400, 1310750},
56 {115200, 1310781},
57 {57600, 1310843},
58 {38400, 1114328},
59 {19200, 1114545},
60 {9600, 1114979},
61 };
62
63 static struct sirfsoc_uart_port sirfsoc_uart_ports[SIRFSOC_UART_NR] = {
64 [0] = {
65 .port = {
66 .iotype = UPIO_MEM,
67 .flags = UPF_BOOT_AUTOCONF,
68 .line = 0,
69 },
70 },
71 [1] = {
72 .port = {
73 .iotype = UPIO_MEM,
74 .flags = UPF_BOOT_AUTOCONF,
75 .line = 1,
76 },
77 },
78 [2] = {
79 .port = {
80 .iotype = UPIO_MEM,
81 .flags = UPF_BOOT_AUTOCONF,
82 .line = 2,
83 },
84 },
85 [3] = {
86 .port = {
87 .iotype = UPIO_MEM,
88 .flags = UPF_BOOT_AUTOCONF,
89 .line = 3,
90 },
91 },
92 [4] = {
93 .port = {
94 .iotype = UPIO_MEM,
95 .flags = UPF_BOOT_AUTOCONF,
96 .line = 4,
97 },
98 },
99 [5] = {
100 .port = {
101 .iotype = UPIO_MEM,
102 .flags = UPF_BOOT_AUTOCONF,
103 .line = 5,
104 },
105 },
106 };
107
108 static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port)
109 {
110 return container_of(port, struct sirfsoc_uart_port, port);
111 }
112
113 static inline unsigned int sirfsoc_uart_tx_empty(struct uart_port *port)
114 {
115 unsigned long reg;
116 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
117 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
118 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
119 reg = rd_regl(port, ureg->sirfsoc_tx_fifo_status);
120
121 return (reg & ufifo_st->ff_empty(port->line)) ? TIOCSER_TEMT : 0;
122 }
123
124 static unsigned int sirfsoc_uart_get_mctrl(struct uart_port *port)
125 {
126 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
127 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
128 if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled)
129 goto cts_asserted;
130 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
131 if (!(rd_regl(port, ureg->sirfsoc_afc_ctrl) &
132 SIRFUART_AFC_CTS_STATUS))
133 goto cts_asserted;
134 else
135 goto cts_deasserted;
136 } else {
137 if (!gpio_get_value(sirfport->cts_gpio))
138 goto cts_asserted;
139 else
140 goto cts_deasserted;
141 }
142 cts_deasserted:
143 return TIOCM_CAR | TIOCM_DSR;
144 cts_asserted:
145 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
146 }
147
148 static void sirfsoc_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
149 {
150 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
151 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
152 unsigned int assert = mctrl & TIOCM_RTS;
153 unsigned int val = assert ? SIRFUART_AFC_CTRL_RX_THD : 0x0;
154 unsigned int current_val;
155
156 if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled)
157 return;
158 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
159 current_val = rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0xFF;
160 val |= current_val;
161 wr_regl(port, ureg->sirfsoc_afc_ctrl, val);
162 } else {
163 if (!val)
164 gpio_set_value(sirfport->rts_gpio, 1);
165 else
166 gpio_set_value(sirfport->rts_gpio, 0);
167 }
168 }
169
170 static void sirfsoc_uart_stop_tx(struct uart_port *port)
171 {
172 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
173 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
174 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
175
176 if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
177 if (sirfport->tx_dma_state == TX_DMA_RUNNING) {
178 dmaengine_pause(sirfport->tx_dma_chan);
179 sirfport->tx_dma_state = TX_DMA_PAUSE;
180 } else {
181 if (!sirfport->is_marco)
182 wr_regl(port, ureg->sirfsoc_int_en_reg,
183 rd_regl(port, ureg->sirfsoc_int_en_reg) &
184 ~uint_en->sirfsoc_txfifo_empty_en);
185 else
186 wr_regl(port, SIRFUART_INT_EN_CLR,
187 uint_en->sirfsoc_txfifo_empty_en);
188 }
189 } else {
190 if (!sirfport->is_marco)
191 wr_regl(port, ureg->sirfsoc_int_en_reg,
192 rd_regl(port, ureg->sirfsoc_int_en_reg) &
193 ~uint_en->sirfsoc_txfifo_empty_en);
194 else
195 wr_regl(port, SIRFUART_INT_EN_CLR,
196 uint_en->sirfsoc_txfifo_empty_en);
197 }
198 }
199
200 static void sirfsoc_uart_tx_with_dma(struct sirfsoc_uart_port *sirfport)
201 {
202 struct uart_port *port = &sirfport->port;
203 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
204 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
205 struct circ_buf *xmit = &port->state->xmit;
206 unsigned long tran_size;
207 unsigned long tran_start;
208 unsigned long pio_tx_size;
209
210 tran_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
211 tran_start = (unsigned long)(xmit->buf + xmit->tail);
212 if (uart_circ_empty(xmit) || uart_tx_stopped(port) ||
213 !tran_size)
214 return;
215 if (sirfport->tx_dma_state == TX_DMA_PAUSE) {
216 dmaengine_resume(sirfport->tx_dma_chan);
217 return;
218 }
219 if (sirfport->tx_dma_state == TX_DMA_RUNNING)
220 return;
221 if (!sirfport->is_marco)
222 wr_regl(port, ureg->sirfsoc_int_en_reg,
223 rd_regl(port, ureg->sirfsoc_int_en_reg)&
224 ~(uint_en->sirfsoc_txfifo_empty_en));
225 else
226 wr_regl(port, SIRFUART_INT_EN_CLR,
227 uint_en->sirfsoc_txfifo_empty_en);
228 /*
229 * DMA requires buffer address and buffer length are both aligned with
230 * 4 bytes, so we use PIO for
231 * 1. if address is not aligned with 4bytes, use PIO for the first 1~3
232 * bytes, and move to DMA for the left part aligned with 4bytes
233 * 2. if buffer length is not aligned with 4bytes, use DMA for aligned
234 * part first, move to PIO for the left 1~3 bytes
235 */
236 if (tran_size < 4 || BYTES_TO_ALIGN(tran_start)) {
237 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP);
238 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
239 rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)|
240 SIRFUART_IO_MODE);
241 if (BYTES_TO_ALIGN(tran_start)) {
242 pio_tx_size = sirfsoc_uart_pio_tx_chars(sirfport,
243 BYTES_TO_ALIGN(tran_start));
244 tran_size -= pio_tx_size;
245 }
246 if (tran_size < 4)
247 sirfsoc_uart_pio_tx_chars(sirfport, tran_size);
248 if (!sirfport->is_marco)
249 wr_regl(port, ureg->sirfsoc_int_en_reg,
250 rd_regl(port, ureg->sirfsoc_int_en_reg)|
251 uint_en->sirfsoc_txfifo_empty_en);
252 else
253 wr_regl(port, ureg->sirfsoc_int_en_reg,
254 uint_en->sirfsoc_txfifo_empty_en);
255 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
256 } else {
257 /* tx transfer mode switch into dma mode */
258 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP);
259 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
260 rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)&
261 ~SIRFUART_IO_MODE);
262 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
263 tran_size &= ~(0x3);
264
265 sirfport->tx_dma_addr = dma_map_single(port->dev,
266 xmit->buf + xmit->tail,
267 tran_size, DMA_TO_DEVICE);
268 sirfport->tx_dma_desc = dmaengine_prep_slave_single(
269 sirfport->tx_dma_chan, sirfport->tx_dma_addr,
270 tran_size, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
271 if (!sirfport->tx_dma_desc) {
272 dev_err(port->dev, "DMA prep slave single fail\n");
273 return;
274 }
275 sirfport->tx_dma_desc->callback =
276 sirfsoc_uart_tx_dma_complete_callback;
277 sirfport->tx_dma_desc->callback_param = (void *)sirfport;
278 sirfport->transfer_size = tran_size;
279
280 dmaengine_submit(sirfport->tx_dma_desc);
281 dma_async_issue_pending(sirfport->tx_dma_chan);
282 sirfport->tx_dma_state = TX_DMA_RUNNING;
283 }
284 }
285
286 static void sirfsoc_uart_start_tx(struct uart_port *port)
287 {
288 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
289 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
290 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
291 if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
292 sirfsoc_uart_tx_with_dma(sirfport);
293 else {
294 sirfsoc_uart_pio_tx_chars(sirfport, 1);
295 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
296 if (!sirfport->is_marco)
297 wr_regl(port, ureg->sirfsoc_int_en_reg,
298 rd_regl(port, ureg->sirfsoc_int_en_reg)|
299 uint_en->sirfsoc_txfifo_empty_en);
300 else
301 wr_regl(port, ureg->sirfsoc_int_en_reg,
302 uint_en->sirfsoc_txfifo_empty_en);
303 }
304 }
305
306 static void sirfsoc_uart_stop_rx(struct uart_port *port)
307 {
308 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
309 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
310 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
311
312 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
313 if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
314 if (!sirfport->is_marco)
315 wr_regl(port, ureg->sirfsoc_int_en_reg,
316 rd_regl(port, ureg->sirfsoc_int_en_reg) &
317 ~(SIRFUART_RX_DMA_INT_EN(port, uint_en) |
318 uint_en->sirfsoc_rx_done_en));
319 else
320 wr_regl(port, SIRFUART_INT_EN_CLR,
321 SIRFUART_RX_DMA_INT_EN(port, uint_en)|
322 uint_en->sirfsoc_rx_done_en);
323 dmaengine_terminate_all(sirfport->rx_dma_chan);
324 } else {
325 if (!sirfport->is_marco)
326 wr_regl(port, ureg->sirfsoc_int_en_reg,
327 rd_regl(port, ureg->sirfsoc_int_en_reg)&
328 ~(SIRFUART_RX_IO_INT_EN(port, uint_en)));
329 else
330 wr_regl(port, SIRFUART_INT_EN_CLR,
331 SIRFUART_RX_IO_INT_EN(port, uint_en));
332 }
333 }
334
335 static void sirfsoc_uart_disable_ms(struct uart_port *port)
336 {
337 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
338 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
339 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
340
341 if (!sirfport->hw_flow_ctrl)
342 return;
343 sirfport->ms_enabled = false;
344 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
345 wr_regl(port, ureg->sirfsoc_afc_ctrl,
346 rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0x3FF);
347 if (!sirfport->is_marco)
348 wr_regl(port, ureg->sirfsoc_int_en_reg,
349 rd_regl(port, ureg->sirfsoc_int_en_reg)&
350 ~uint_en->sirfsoc_cts_en);
351 else
352 wr_regl(port, SIRFUART_INT_EN_CLR,
353 uint_en->sirfsoc_cts_en);
354 } else
355 disable_irq(gpio_to_irq(sirfport->cts_gpio));
356 }
357
358 static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id)
359 {
360 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
361 struct uart_port *port = &sirfport->port;
362 if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled)
363 uart_handle_cts_change(port,
364 !gpio_get_value(sirfport->cts_gpio));
365 return IRQ_HANDLED;
366 }
367
368 static void sirfsoc_uart_enable_ms(struct uart_port *port)
369 {
370 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
371 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
372 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
373
374 if (!sirfport->hw_flow_ctrl)
375 return;
376 sirfport->ms_enabled = true;
377 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
378 wr_regl(port, ureg->sirfsoc_afc_ctrl,
379 rd_regl(port, ureg->sirfsoc_afc_ctrl) |
380 SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN);
381 if (!sirfport->is_marco)
382 wr_regl(port, ureg->sirfsoc_int_en_reg,
383 rd_regl(port, ureg->sirfsoc_int_en_reg)
384 | uint_en->sirfsoc_cts_en);
385 else
386 wr_regl(port, ureg->sirfsoc_int_en_reg,
387 uint_en->sirfsoc_cts_en);
388 } else
389 enable_irq(gpio_to_irq(sirfport->cts_gpio));
390 }
391
392 static void sirfsoc_uart_break_ctl(struct uart_port *port, int break_state)
393 {
394 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
395 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
396 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
397 unsigned long ulcon = rd_regl(port, ureg->sirfsoc_line_ctrl);
398 if (break_state)
399 ulcon |= SIRFUART_SET_BREAK;
400 else
401 ulcon &= ~SIRFUART_SET_BREAK;
402 wr_regl(port, ureg->sirfsoc_line_ctrl, ulcon);
403 }
404 }
405
406 static unsigned int
407 sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
408 {
409 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
410 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
411 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
412 unsigned int ch, rx_count = 0;
413 struct tty_struct *tty;
414 tty = tty_port_tty_get(&port->state->port);
415 if (!tty)
416 return -ENODEV;
417 while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) &
418 ufifo_st->ff_empty(port->line))) {
419 ch = rd_regl(port, ureg->sirfsoc_rx_fifo_data) |
420 SIRFUART_DUMMY_READ;
421 if (unlikely(uart_handle_sysrq_char(port, ch)))
422 continue;
423 uart_insert_char(port, 0, 0, ch, TTY_NORMAL);
424 rx_count++;
425 if (rx_count >= max_rx_count)
426 break;
427 }
428
429 sirfport->rx_io_count += rx_count;
430 port->icount.rx += rx_count;
431
432 spin_unlock(&port->lock);
433 tty_flip_buffer_push(&port->state->port);
434 spin_lock(&port->lock);
435
436 return rx_count;
437 }
438
439 static unsigned int
440 sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count)
441 {
442 struct uart_port *port = &sirfport->port;
443 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
444 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
445 struct circ_buf *xmit = &port->state->xmit;
446 unsigned int num_tx = 0;
447 while (!uart_circ_empty(xmit) &&
448 !(rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
449 ufifo_st->ff_full(port->line)) &&
450 count--) {
451 wr_regl(port, ureg->sirfsoc_tx_fifo_data,
452 xmit->buf[xmit->tail]);
453 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
454 port->icount.tx++;
455 num_tx++;
456 }
457 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
458 uart_write_wakeup(port);
459 return num_tx;
460 }
461
462 static void sirfsoc_uart_tx_dma_complete_callback(void *param)
463 {
464 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
465 struct uart_port *port = &sirfport->port;
466 struct circ_buf *xmit = &port->state->xmit;
467 unsigned long flags;
468
469 xmit->tail = (xmit->tail + sirfport->transfer_size) &
470 (UART_XMIT_SIZE - 1);
471 port->icount.tx += sirfport->transfer_size;
472 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
473 uart_write_wakeup(port);
474 if (sirfport->tx_dma_addr)
475 dma_unmap_single(port->dev, sirfport->tx_dma_addr,
476 sirfport->transfer_size, DMA_TO_DEVICE);
477 spin_lock_irqsave(&sirfport->tx_lock, flags);
478 sirfport->tx_dma_state = TX_DMA_IDLE;
479 sirfsoc_uart_tx_with_dma(sirfport);
480 spin_unlock_irqrestore(&sirfport->tx_lock, flags);
481 }
482
483 static void sirfsoc_uart_insert_rx_buf_to_tty(
484 struct sirfsoc_uart_port *sirfport, int count)
485 {
486 struct uart_port *port = &sirfport->port;
487 struct tty_port *tport = &port->state->port;
488 int inserted;
489
490 inserted = tty_insert_flip_string(tport,
491 sirfport->rx_dma_items[sirfport->rx_completed].xmit.buf, count);
492 port->icount.rx += inserted;
493 tty_flip_buffer_push(tport);
494 }
495
496 static void sirfsoc_rx_submit_one_dma_desc(struct uart_port *port, int index)
497 {
498 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
499
500 sirfport->rx_dma_items[index].xmit.tail =
501 sirfport->rx_dma_items[index].xmit.head = 0;
502 sirfport->rx_dma_items[index].desc =
503 dmaengine_prep_slave_single(sirfport->rx_dma_chan,
504 sirfport->rx_dma_items[index].dma_addr, SIRFSOC_RX_DMA_BUF_SIZE,
505 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
506 if (!sirfport->rx_dma_items[index].desc) {
507 dev_err(port->dev, "DMA slave single fail\n");
508 return;
509 }
510 sirfport->rx_dma_items[index].desc->callback =
511 sirfsoc_uart_rx_dma_complete_callback;
512 sirfport->rx_dma_items[index].desc->callback_param = sirfport;
513 sirfport->rx_dma_items[index].cookie =
514 dmaengine_submit(sirfport->rx_dma_items[index].desc);
515 dma_async_issue_pending(sirfport->rx_dma_chan);
516 }
517
518 static void sirfsoc_rx_tmo_process_tl(unsigned long param)
519 {
520 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
521 struct uart_port *port = &sirfport->port;
522 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
523 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
524 struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
525 unsigned int count;
526 unsigned long flags;
527 struct dma_tx_state tx_state;
528
529 spin_lock_irqsave(&sirfport->rx_lock, flags);
530 while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
531 sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
532 sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
533 SIRFSOC_RX_DMA_BUF_SIZE);
534 sirfport->rx_completed++;
535 sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
536 }
537 count = CIRC_CNT(sirfport->rx_dma_items[sirfport->rx_issued].xmit.head,
538 sirfport->rx_dma_items[sirfport->rx_issued].xmit.tail,
539 SIRFSOC_RX_DMA_BUF_SIZE);
540 if (count > 0)
541 sirfsoc_uart_insert_rx_buf_to_tty(sirfport, count);
542 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
543 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
544 SIRFUART_IO_MODE);
545 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
546 spin_lock(&port->lock);
547 sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
548 spin_unlock(&port->lock);
549 if (sirfport->rx_io_count == 4) {
550 spin_lock_irqsave(&sirfport->rx_lock, flags);
551 sirfport->rx_io_count = 0;
552 wr_regl(port, ureg->sirfsoc_int_st_reg,
553 uint_st->sirfsoc_rx_done);
554 if (!sirfport->is_marco)
555 wr_regl(port, ureg->sirfsoc_int_en_reg,
556 rd_regl(port, ureg->sirfsoc_int_en_reg) &
557 ~(uint_en->sirfsoc_rx_done_en));
558 else
559 wr_regl(port, SIRFUART_INT_EN_CLR,
560 uint_en->sirfsoc_rx_done_en);
561 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
562
563 sirfsoc_uart_start_next_rx_dma(port);
564 } else {
565 spin_lock_irqsave(&sirfport->rx_lock, flags);
566 wr_regl(port, ureg->sirfsoc_int_st_reg,
567 uint_st->sirfsoc_rx_done);
568 if (!sirfport->is_marco)
569 wr_regl(port, ureg->sirfsoc_int_en_reg,
570 rd_regl(port, ureg->sirfsoc_int_en_reg) |
571 (uint_en->sirfsoc_rx_done_en));
572 else
573 wr_regl(port, ureg->sirfsoc_int_en_reg,
574 uint_en->sirfsoc_rx_done_en);
575 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
576 }
577 }
578
579 static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
580 {
581 struct uart_port *port = &sirfport->port;
582 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
583 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
584 struct dma_tx_state tx_state;
585 spin_lock(&sirfport->rx_lock);
586
587 dmaengine_tx_status(sirfport->rx_dma_chan,
588 sirfport->rx_dma_items[sirfport->rx_issued].cookie, &tx_state);
589 dmaengine_terminate_all(sirfport->rx_dma_chan);
590 sirfport->rx_dma_items[sirfport->rx_issued].xmit.head =
591 SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue;
592 if (!sirfport->is_marco)
593 wr_regl(port, ureg->sirfsoc_int_en_reg,
594 rd_regl(port, ureg->sirfsoc_int_en_reg) &
595 ~(uint_en->sirfsoc_rx_timeout_en));
596 else
597 wr_regl(port, SIRFUART_INT_EN_CLR,
598 uint_en->sirfsoc_rx_timeout_en);
599 spin_unlock(&sirfport->rx_lock);
600 tasklet_schedule(&sirfport->rx_tmo_process_tasklet);
601 }
602
603 static void sirfsoc_uart_handle_rx_done(struct sirfsoc_uart_port *sirfport)
604 {
605 struct uart_port *port = &sirfport->port;
606 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
607 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
608 struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
609
610 sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
611 if (sirfport->rx_io_count == 4) {
612 sirfport->rx_io_count = 0;
613 if (!sirfport->is_marco)
614 wr_regl(port, ureg->sirfsoc_int_en_reg,
615 rd_regl(port, ureg->sirfsoc_int_en_reg) &
616 ~(uint_en->sirfsoc_rx_done_en));
617 else
618 wr_regl(port, SIRFUART_INT_EN_CLR,
619 uint_en->sirfsoc_rx_done_en);
620 wr_regl(port, ureg->sirfsoc_int_st_reg,
621 uint_st->sirfsoc_rx_timeout);
622 sirfsoc_uart_start_next_rx_dma(port);
623 }
624 }
625
626 static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
627 {
628 unsigned long intr_status;
629 unsigned long cts_status;
630 unsigned long flag = TTY_NORMAL;
631 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
632 struct uart_port *port = &sirfport->port;
633 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
634 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
635 struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
636 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
637 struct uart_state *state = port->state;
638 struct circ_buf *xmit = &port->state->xmit;
639 spin_lock(&port->lock);
640 intr_status = rd_regl(port, ureg->sirfsoc_int_st_reg);
641 wr_regl(port, ureg->sirfsoc_int_st_reg, intr_status);
642 intr_status &= rd_regl(port, ureg->sirfsoc_int_en_reg);
643 if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT(port, uint_st)))) {
644 if (intr_status & uint_st->sirfsoc_rxd_brk) {
645 port->icount.brk++;
646 if (uart_handle_break(port))
647 goto recv_char;
648 }
649 if (intr_status & uint_st->sirfsoc_rx_oflow)
650 port->icount.overrun++;
651 if (intr_status & uint_st->sirfsoc_frm_err) {
652 port->icount.frame++;
653 flag = TTY_FRAME;
654 }
655 if (intr_status & uint_st->sirfsoc_parity_err)
656 flag = TTY_PARITY;
657 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
658 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
659 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
660 intr_status &= port->read_status_mask;
661 uart_insert_char(port, intr_status,
662 uint_en->sirfsoc_rx_oflow_en, 0, flag);
663 tty_flip_buffer_push(&state->port);
664 }
665 recv_char:
666 if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) &&
667 (intr_status & SIRFUART_CTS_INT_ST(uint_st)) &&
668 !sirfport->tx_dma_state) {
669 cts_status = rd_regl(port, ureg->sirfsoc_afc_ctrl) &
670 SIRFUART_AFC_CTS_STATUS;
671 if (cts_status != 0)
672 cts_status = 0;
673 else
674 cts_status = 1;
675 uart_handle_cts_change(port, cts_status);
676 wake_up_interruptible(&state->port.delta_msr_wait);
677 }
678 if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
679 if (intr_status & uint_st->sirfsoc_rx_timeout)
680 sirfsoc_uart_handle_rx_tmo(sirfport);
681 if (intr_status & uint_st->sirfsoc_rx_done)
682 sirfsoc_uart_handle_rx_done(sirfport);
683 } else {
684 if (intr_status & SIRFUART_RX_IO_INT_ST(uint_st))
685 sirfsoc_uart_pio_rx_chars(port,
686 SIRFSOC_UART_IO_RX_MAX_CNT);
687 }
688 if (intr_status & uint_st->sirfsoc_txfifo_empty) {
689 if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
690 sirfsoc_uart_tx_with_dma(sirfport);
691 else {
692 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
693 spin_unlock(&port->lock);
694 return IRQ_HANDLED;
695 } else {
696 sirfsoc_uart_pio_tx_chars(sirfport,
697 SIRFSOC_UART_IO_TX_REASONABLE_CNT);
698 if ((uart_circ_empty(xmit)) &&
699 (rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
700 ufifo_st->ff_empty(port->line)))
701 sirfsoc_uart_stop_tx(port);
702 }
703 }
704 }
705 spin_unlock(&port->lock);
706 return IRQ_HANDLED;
707 }
708
709 static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param)
710 {
711 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
712 struct uart_port *port = &sirfport->port;
713 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
714 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
715 unsigned long flags;
716 struct dma_tx_state tx_state;
717 spin_lock_irqsave(&sirfport->rx_lock, flags);
718 while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
719 sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
720 sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
721 SIRFSOC_RX_DMA_BUF_SIZE);
722 if (rd_regl(port, ureg->sirfsoc_int_en_reg) &
723 uint_en->sirfsoc_rx_timeout_en)
724 sirfsoc_rx_submit_one_dma_desc(port,
725 sirfport->rx_completed++);
726 else
727 sirfport->rx_completed++;
728 sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
729 }
730 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
731 }
732
733 static void sirfsoc_uart_rx_dma_complete_callback(void *param)
734 {
735 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
736 spin_lock(&sirfport->rx_lock);
737 sirfport->rx_issued++;
738 sirfport->rx_issued %= SIRFSOC_RX_LOOP_BUF_CNT;
739 spin_unlock(&sirfport->rx_lock);
740 tasklet_schedule(&sirfport->rx_dma_complete_tasklet);
741 }
742
743 /* submit rx dma task into dmaengine */
744 static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
745 {
746 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
747 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
748 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
749 unsigned long flags;
750 int i;
751 spin_lock_irqsave(&sirfport->rx_lock, flags);
752 sirfport->rx_io_count = 0;
753 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
754 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
755 ~SIRFUART_IO_MODE);
756 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
757 for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
758 sirfsoc_rx_submit_one_dma_desc(port, i);
759 sirfport->rx_completed = sirfport->rx_issued = 0;
760 spin_lock_irqsave(&sirfport->rx_lock, flags);
761 if (!sirfport->is_marco)
762 wr_regl(port, ureg->sirfsoc_int_en_reg,
763 rd_regl(port, ureg->sirfsoc_int_en_reg) |
764 SIRFUART_RX_DMA_INT_EN(port, uint_en));
765 else
766 wr_regl(port, ureg->sirfsoc_int_en_reg,
767 SIRFUART_RX_DMA_INT_EN(port, uint_en));
768 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
769 }
770
771 static void sirfsoc_uart_start_rx(struct uart_port *port)
772 {
773 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
774 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
775 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
776
777 sirfport->rx_io_count = 0;
778 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
779 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
780 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
781 if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
782 sirfsoc_uart_start_next_rx_dma(port);
783 else {
784 if (!sirfport->is_marco)
785 wr_regl(port, ureg->sirfsoc_int_en_reg,
786 rd_regl(port, ureg->sirfsoc_int_en_reg) |
787 SIRFUART_RX_IO_INT_EN(port, uint_en));
788 else
789 wr_regl(port, ureg->sirfsoc_int_en_reg,
790 SIRFUART_RX_IO_INT_EN(port, uint_en));
791 }
792 }
793
794 static unsigned int
795 sirfsoc_usp_calc_sample_div(unsigned long set_rate,
796 unsigned long ioclk_rate, unsigned long *sample_reg)
797 {
798 unsigned long min_delta = ~0UL;
799 unsigned short sample_div;
800 unsigned long ioclk_div = 0;
801 unsigned long temp_delta;
802
803 for (sample_div = SIRF_MIN_SAMPLE_DIV;
804 sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) {
805 temp_delta = ioclk_rate -
806 (ioclk_rate + (set_rate * sample_div) / 2)
807 / (set_rate * sample_div) * set_rate * sample_div;
808
809 temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta;
810 if (temp_delta < min_delta) {
811 ioclk_div = (2 * ioclk_rate /
812 (set_rate * sample_div) + 1) / 2 - 1;
813 if (ioclk_div > SIRF_IOCLK_DIV_MAX)
814 continue;
815 min_delta = temp_delta;
816 *sample_reg = sample_div;
817 if (!temp_delta)
818 break;
819 }
820 }
821 return ioclk_div;
822 }
823
824 static unsigned int
825 sirfsoc_uart_calc_sample_div(unsigned long baud_rate,
826 unsigned long ioclk_rate, unsigned long *set_baud)
827 {
828 unsigned long min_delta = ~0UL;
829 unsigned short sample_div;
830 unsigned int regv = 0;
831 unsigned long ioclk_div;
832 unsigned long baud_tmp;
833 int temp_delta;
834
835 for (sample_div = SIRF_MIN_SAMPLE_DIV;
836 sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) {
837 ioclk_div = (ioclk_rate / (baud_rate * (sample_div + 1))) - 1;
838 if (ioclk_div > SIRF_IOCLK_DIV_MAX)
839 continue;
840 baud_tmp = ioclk_rate / ((ioclk_div + 1) * (sample_div + 1));
841 temp_delta = baud_tmp - baud_rate;
842 temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta;
843 if (temp_delta < min_delta) {
844 regv = regv & (~SIRF_IOCLK_DIV_MASK);
845 regv = regv | ioclk_div;
846 regv = regv & (~SIRF_SAMPLE_DIV_MASK);
847 regv = regv | (sample_div << SIRF_SAMPLE_DIV_SHIFT);
848 min_delta = temp_delta;
849 *set_baud = baud_tmp;
850 }
851 }
852 return regv;
853 }
854
855 static void sirfsoc_uart_set_termios(struct uart_port *port,
856 struct ktermios *termios,
857 struct ktermios *old)
858 {
859 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
860 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
861 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
862 unsigned long config_reg = 0;
863 unsigned long baud_rate;
864 unsigned long set_baud;
865 unsigned long flags;
866 unsigned long ic;
867 unsigned int clk_div_reg = 0;
868 unsigned long txfifo_op_reg, ioclk_rate;
869 unsigned long rx_time_out;
870 int threshold_div;
871 u32 data_bit_len, stop_bit_len, len_val;
872 unsigned long sample_div_reg = 0xf;
873 ioclk_rate = port->uartclk;
874
875 switch (termios->c_cflag & CSIZE) {
876 default:
877 case CS8:
878 data_bit_len = 8;
879 config_reg |= SIRFUART_DATA_BIT_LEN_8;
880 break;
881 case CS7:
882 data_bit_len = 7;
883 config_reg |= SIRFUART_DATA_BIT_LEN_7;
884 break;
885 case CS6:
886 data_bit_len = 6;
887 config_reg |= SIRFUART_DATA_BIT_LEN_6;
888 break;
889 case CS5:
890 data_bit_len = 5;
891 config_reg |= SIRFUART_DATA_BIT_LEN_5;
892 break;
893 }
894 if (termios->c_cflag & CSTOPB) {
895 config_reg |= SIRFUART_STOP_BIT_LEN_2;
896 stop_bit_len = 2;
897 } else
898 stop_bit_len = 1;
899
900 spin_lock_irqsave(&port->lock, flags);
901 port->read_status_mask = uint_en->sirfsoc_rx_oflow_en;
902 port->ignore_status_mask = 0;
903 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
904 if (termios->c_iflag & INPCK)
905 port->read_status_mask |= uint_en->sirfsoc_frm_err_en |
906 uint_en->sirfsoc_parity_err_en;
907 } else {
908 if (termios->c_iflag & INPCK)
909 port->read_status_mask |= uint_en->sirfsoc_frm_err_en;
910 }
911 if (termios->c_iflag & (BRKINT | PARMRK))
912 port->read_status_mask |= uint_en->sirfsoc_rxd_brk_en;
913 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
914 if (termios->c_iflag & IGNPAR)
915 port->ignore_status_mask |=
916 uint_en->sirfsoc_frm_err_en |
917 uint_en->sirfsoc_parity_err_en;
918 if (termios->c_cflag & PARENB) {
919 if (termios->c_cflag & CMSPAR) {
920 if (termios->c_cflag & PARODD)
921 config_reg |= SIRFUART_STICK_BIT_MARK;
922 else
923 config_reg |= SIRFUART_STICK_BIT_SPACE;
924 } else if (termios->c_cflag & PARODD) {
925 config_reg |= SIRFUART_STICK_BIT_ODD;
926 } else {
927 config_reg |= SIRFUART_STICK_BIT_EVEN;
928 }
929 }
930 } else {
931 if (termios->c_iflag & IGNPAR)
932 port->ignore_status_mask |=
933 uint_en->sirfsoc_frm_err_en;
934 if (termios->c_cflag & PARENB)
935 dev_warn(port->dev,
936 "USP-UART not support parity err\n");
937 }
938 if (termios->c_iflag & IGNBRK) {
939 port->ignore_status_mask |=
940 uint_en->sirfsoc_rxd_brk_en;
941 if (termios->c_iflag & IGNPAR)
942 port->ignore_status_mask |=
943 uint_en->sirfsoc_rx_oflow_en;
944 }
945 if ((termios->c_cflag & CREAD) == 0)
946 port->ignore_status_mask |= SIRFUART_DUMMY_READ;
947 /* Hardware Flow Control Settings */
948 if (UART_ENABLE_MS(port, termios->c_cflag)) {
949 if (!sirfport->ms_enabled)
950 sirfsoc_uart_enable_ms(port);
951 } else {
952 if (sirfport->ms_enabled)
953 sirfsoc_uart_disable_ms(port);
954 }
955 baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000);
956 if (ioclk_rate == 150000000) {
957 for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
958 if (baud_rate == baudrate_to_regv[ic].baud_rate)
959 clk_div_reg = baudrate_to_regv[ic].reg_val;
960 }
961 set_baud = baud_rate;
962 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
963 if (unlikely(clk_div_reg == 0))
964 clk_div_reg = sirfsoc_uart_calc_sample_div(baud_rate,
965 ioclk_rate, &set_baud);
966 wr_regl(port, ureg->sirfsoc_divisor, clk_div_reg);
967 } else {
968 clk_div_reg = sirfsoc_usp_calc_sample_div(baud_rate,
969 ioclk_rate, &sample_div_reg);
970 sample_div_reg--;
971 set_baud = ((ioclk_rate / (clk_div_reg+1) - 1) /
972 (sample_div_reg + 1));
973 /* setting usp mode 2 */
974 len_val = ((1 << SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET) |
975 (1 << SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET));
976 len_val |= ((clk_div_reg & SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK)
977 << SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET);
978 wr_regl(port, ureg->sirfsoc_mode2, len_val);
979 }
980 if (tty_termios_baud_rate(termios))
981 tty_termios_encode_baud_rate(termios, set_baud, set_baud);
982 /* set receive timeout && data bits len */
983 rx_time_out = SIRFSOC_UART_RX_TIMEOUT(set_baud, 20000);
984 rx_time_out = SIRFUART_RECV_TIMEOUT_VALUE(rx_time_out);
985 txfifo_op_reg = rd_regl(port, ureg->sirfsoc_tx_fifo_op);
986 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_STOP);
987 wr_regl(port, ureg->sirfsoc_tx_fifo_op,
988 (txfifo_op_reg & ~SIRFUART_FIFO_START));
989 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
990 config_reg |= SIRFUART_RECV_TIMEOUT(port, rx_time_out);
991 wr_regl(port, ureg->sirfsoc_line_ctrl, config_reg);
992 } else {
993 /*tx frame ctrl*/
994 len_val = (data_bit_len - 1) << SIRFSOC_USP_TX_DATA_LEN_OFFSET;
995 len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
996 SIRFSOC_USP_TX_FRAME_LEN_OFFSET;
997 len_val |= ((data_bit_len - 1) <<
998 SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET);
999 len_val |= (((clk_div_reg & 0xc00) >> 10) <<
1000 SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET);
1001 wr_regl(port, ureg->sirfsoc_tx_frame_ctrl, len_val);
1002 /*rx frame ctrl*/
1003 len_val = (data_bit_len - 1) << SIRFSOC_USP_RX_DATA_LEN_OFFSET;
1004 len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
1005 SIRFSOC_USP_RX_FRAME_LEN_OFFSET;
1006 len_val |= (data_bit_len - 1) <<
1007 SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET;
1008 len_val |= (((clk_div_reg & 0xf000) >> 12) <<
1009 SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET);
1010 wr_regl(port, ureg->sirfsoc_rx_frame_ctrl, len_val);
1011 /*async param*/
1012 wr_regl(port, ureg->sirfsoc_async_param_reg,
1013 (SIRFUART_RECV_TIMEOUT(port, rx_time_out)) |
1014 (sample_div_reg & SIRFSOC_USP_ASYNC_DIV2_MASK) <<
1015 SIRFSOC_USP_ASYNC_DIV2_OFFSET);
1016 }
1017 if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
1018 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_DMA_MODE);
1019 else
1020 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE);
1021 if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
1022 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_DMA_MODE);
1023 else
1024 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_IO_MODE);
1025 /* Reset Rx/Tx FIFO Threshold level for proper baudrate */
1026 if (set_baud < 1000000)
1027 threshold_div = 1;
1028 else
1029 threshold_div = 2;
1030 wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl,
1031 SIRFUART_FIFO_THD(port) / threshold_div);
1032 wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl,
1033 SIRFUART_FIFO_THD(port) / threshold_div);
1034 txfifo_op_reg |= SIRFUART_FIFO_START;
1035 wr_regl(port, ureg->sirfsoc_tx_fifo_op, txfifo_op_reg);
1036 uart_update_timeout(port, termios->c_cflag, set_baud);
1037 sirfsoc_uart_start_rx(port);
1038 wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_TX_EN | SIRFUART_RX_EN);
1039 spin_unlock_irqrestore(&port->lock, flags);
1040 }
1041
1042 static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state,
1043 unsigned int oldstate)
1044 {
1045 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1046 if (!state)
1047 clk_prepare_enable(sirfport->clk);
1048 else
1049 clk_disable_unprepare(sirfport->clk);
1050 }
1051
1052 static unsigned int sirfsoc_uart_init_tx_dma(struct uart_port *port)
1053 {
1054 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1055 dma_cap_mask_t dma_mask;
1056 struct dma_slave_config tx_slv_cfg = {
1057 .dst_maxburst = 2,
1058 };
1059
1060 dma_cap_zero(dma_mask);
1061 dma_cap_set(DMA_SLAVE, dma_mask);
1062 sirfport->tx_dma_chan = dma_request_channel(dma_mask,
1063 (dma_filter_fn)sirfsoc_dma_filter_id,
1064 (void *)sirfport->tx_dma_no);
1065 if (!sirfport->tx_dma_chan) {
1066 dev_err(port->dev, "Uart Request Dma Channel Fail %d\n",
1067 sirfport->tx_dma_no);
1068 return -EPROBE_DEFER;
1069 }
1070 dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg);
1071
1072 return 0;
1073 }
1074
1075 static unsigned int sirfsoc_uart_init_rx_dma(struct uart_port *port)
1076 {
1077 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1078 dma_cap_mask_t dma_mask;
1079 int ret;
1080 int i, j;
1081 struct dma_slave_config slv_cfg = {
1082 .src_maxburst = 2,
1083 };
1084
1085 dma_cap_zero(dma_mask);
1086 dma_cap_set(DMA_SLAVE, dma_mask);
1087 sirfport->rx_dma_chan = dma_request_channel(dma_mask,
1088 (dma_filter_fn)sirfsoc_dma_filter_id,
1089 (void *)sirfport->rx_dma_no);
1090 if (!sirfport->rx_dma_chan) {
1091 dev_err(port->dev, "Uart Request Dma Channel Fail %d\n",
1092 sirfport->rx_dma_no);
1093 ret = -EPROBE_DEFER;
1094 goto request_err;
1095 }
1096 for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++) {
1097 sirfport->rx_dma_items[i].xmit.buf =
1098 dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1099 &sirfport->rx_dma_items[i].dma_addr, GFP_KERNEL);
1100 if (!sirfport->rx_dma_items[i].xmit.buf) {
1101 dev_err(port->dev, "Uart alloc bufa failed\n");
1102 ret = -ENOMEM;
1103 goto alloc_coherent_err;
1104 }
1105 sirfport->rx_dma_items[i].xmit.head =
1106 sirfport->rx_dma_items[i].xmit.tail = 0;
1107 }
1108 dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg);
1109
1110 return 0;
1111 alloc_coherent_err:
1112 for (j = 0; j < i; j++)
1113 dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1114 sirfport->rx_dma_items[j].xmit.buf,
1115 sirfport->rx_dma_items[j].dma_addr);
1116 dma_release_channel(sirfport->rx_dma_chan);
1117 request_err:
1118 return ret;
1119 }
1120
1121 static void sirfsoc_uart_uninit_tx_dma(struct sirfsoc_uart_port *sirfport)
1122 {
1123 dmaengine_terminate_all(sirfport->tx_dma_chan);
1124 dma_release_channel(sirfport->tx_dma_chan);
1125 }
1126
1127 static void sirfsoc_uart_uninit_rx_dma(struct sirfsoc_uart_port *sirfport)
1128 {
1129 int i;
1130 struct uart_port *port = &sirfport->port;
1131 dmaengine_terminate_all(sirfport->rx_dma_chan);
1132 dma_release_channel(sirfport->rx_dma_chan);
1133 for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
1134 dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1135 sirfport->rx_dma_items[i].xmit.buf,
1136 sirfport->rx_dma_items[i].dma_addr);
1137 }
1138
1139 static int sirfsoc_uart_startup(struct uart_port *port)
1140 {
1141 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1142 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1143 unsigned int index = port->line;
1144 int ret;
1145 set_irq_flags(port->irq, IRQF_VALID | IRQF_NOAUTOEN);
1146 ret = request_irq(port->irq,
1147 sirfsoc_uart_isr,
1148 0,
1149 SIRFUART_PORT_NAME,
1150 sirfport);
1151 if (ret != 0) {
1152 dev_err(port->dev, "UART%d request IRQ line (%d) failed.\n",
1153 index, port->irq);
1154 goto irq_err;
1155 }
1156
1157 /* initial hardware settings */
1158 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
1159 rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl) |
1160 SIRFUART_IO_MODE);
1161 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
1162 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
1163 SIRFUART_IO_MODE);
1164 wr_regl(port, ureg->sirfsoc_tx_dma_io_len, 0);
1165 wr_regl(port, ureg->sirfsoc_rx_dma_io_len, 0);
1166 wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_RX_EN | SIRFUART_TX_EN);
1167 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
1168 wr_regl(port, ureg->sirfsoc_mode1,
1169 SIRFSOC_USP_ENDIAN_CTRL_LSBF |
1170 SIRFSOC_USP_EN);
1171 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_RESET);
1172 wr_regl(port, ureg->sirfsoc_tx_fifo_op, 0);
1173 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
1174 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
1175 wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, SIRFUART_FIFO_THD(port));
1176 wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port));
1177
1178 if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
1179 ret = sirfsoc_uart_init_rx_dma(port);
1180 if (ret)
1181 goto init_rx_err;
1182 wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk,
1183 SIRFUART_RX_FIFO_CHK_SC(port->line, 0x4) |
1184 SIRFUART_RX_FIFO_CHK_LC(port->line, 0xe) |
1185 SIRFUART_RX_FIFO_CHK_HC(port->line, 0x1b));
1186 }
1187 if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
1188 sirfsoc_uart_init_tx_dma(port);
1189 sirfport->tx_dma_state = TX_DMA_IDLE;
1190 wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk,
1191 SIRFUART_TX_FIFO_CHK_SC(port->line, 0x1b) |
1192 SIRFUART_TX_FIFO_CHK_LC(port->line, 0xe) |
1193 SIRFUART_TX_FIFO_CHK_HC(port->line, 0x4));
1194 }
1195 sirfport->ms_enabled = false;
1196 if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
1197 sirfport->hw_flow_ctrl) {
1198 set_irq_flags(gpio_to_irq(sirfport->cts_gpio),
1199 IRQF_VALID | IRQF_NOAUTOEN);
1200 ret = request_irq(gpio_to_irq(sirfport->cts_gpio),
1201 sirfsoc_uart_usp_cts_handler, IRQF_TRIGGER_FALLING |
1202 IRQF_TRIGGER_RISING, "usp_cts_irq", sirfport);
1203 if (ret != 0) {
1204 dev_err(port->dev, "UART-USP:request gpio irq fail\n");
1205 goto init_rx_err;
1206 }
1207 }
1208
1209 enable_irq(port->irq);
1210
1211 return 0;
1212 init_rx_err:
1213 free_irq(port->irq, sirfport);
1214 irq_err:
1215 return ret;
1216 }
1217
1218 static void sirfsoc_uart_shutdown(struct uart_port *port)
1219 {
1220 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1221 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1222 if (!sirfport->is_marco)
1223 wr_regl(port, ureg->sirfsoc_int_en_reg, 0);
1224 else
1225 wr_regl(port, SIRFUART_INT_EN_CLR, ~0UL);
1226
1227 free_irq(port->irq, sirfport);
1228 if (sirfport->ms_enabled)
1229 sirfsoc_uart_disable_ms(port);
1230 if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
1231 sirfport->hw_flow_ctrl) {
1232 gpio_set_value(sirfport->rts_gpio, 1);
1233 free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport);
1234 }
1235 if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
1236 sirfsoc_uart_uninit_rx_dma(sirfport);
1237 if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
1238 sirfsoc_uart_uninit_tx_dma(sirfport);
1239 sirfport->tx_dma_state = TX_DMA_IDLE;
1240 }
1241 }
1242
1243 static const char *sirfsoc_uart_type(struct uart_port *port)
1244 {
1245 return port->type == SIRFSOC_PORT_TYPE ? SIRFUART_PORT_NAME : NULL;
1246 }
1247
1248 static int sirfsoc_uart_request_port(struct uart_port *port)
1249 {
1250 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1251 struct sirfsoc_uart_param *uart_param = &sirfport->uart_reg->uart_param;
1252 void *ret;
1253 ret = request_mem_region(port->mapbase,
1254 SIRFUART_MAP_SIZE, uart_param->port_name);
1255 return ret ? 0 : -EBUSY;
1256 }
1257
1258 static void sirfsoc_uart_release_port(struct uart_port *port)
1259 {
1260 release_mem_region(port->mapbase, SIRFUART_MAP_SIZE);
1261 }
1262
1263 static void sirfsoc_uart_config_port(struct uart_port *port, int flags)
1264 {
1265 if (flags & UART_CONFIG_TYPE) {
1266 port->type = SIRFSOC_PORT_TYPE;
1267 sirfsoc_uart_request_port(port);
1268 }
1269 }
1270
1271 static struct uart_ops sirfsoc_uart_ops = {
1272 .tx_empty = sirfsoc_uart_tx_empty,
1273 .get_mctrl = sirfsoc_uart_get_mctrl,
1274 .set_mctrl = sirfsoc_uart_set_mctrl,
1275 .stop_tx = sirfsoc_uart_stop_tx,
1276 .start_tx = sirfsoc_uart_start_tx,
1277 .stop_rx = sirfsoc_uart_stop_rx,
1278 .enable_ms = sirfsoc_uart_enable_ms,
1279 .break_ctl = sirfsoc_uart_break_ctl,
1280 .startup = sirfsoc_uart_startup,
1281 .shutdown = sirfsoc_uart_shutdown,
1282 .set_termios = sirfsoc_uart_set_termios,
1283 .pm = sirfsoc_uart_pm,
1284 .type = sirfsoc_uart_type,
1285 .release_port = sirfsoc_uart_release_port,
1286 .request_port = sirfsoc_uart_request_port,
1287 .config_port = sirfsoc_uart_config_port,
1288 };
1289
1290 #ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE
1291 static int __init
1292 sirfsoc_uart_console_setup(struct console *co, char *options)
1293 {
1294 unsigned int baud = 115200;
1295 unsigned int bits = 8;
1296 unsigned int parity = 'n';
1297 unsigned int flow = 'n';
1298 struct uart_port *port = &sirfsoc_uart_ports[co->index].port;
1299 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1300 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1301 if (co->index < 0 || co->index >= SIRFSOC_UART_NR)
1302 return -EINVAL;
1303
1304 if (!port->mapbase)
1305 return -ENODEV;
1306
1307 /* enable usp in mode1 register */
1308 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
1309 wr_regl(port, ureg->sirfsoc_mode1, SIRFSOC_USP_EN |
1310 SIRFSOC_USP_ENDIAN_CTRL_LSBF);
1311 if (options)
1312 uart_parse_options(options, &baud, &parity, &bits, &flow);
1313 port->cons = co;
1314
1315 /* default console tx/rx transfer using io mode */
1316 sirfport->rx_dma_no = UNVALID_DMA_CHAN;
1317 sirfport->tx_dma_no = UNVALID_DMA_CHAN;
1318 return uart_set_options(port, co, baud, parity, bits, flow);
1319 }
1320
1321 static void sirfsoc_uart_console_putchar(struct uart_port *port, int ch)
1322 {
1323 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1324 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1325 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
1326 while (rd_regl(port,
1327 ureg->sirfsoc_tx_fifo_status) & ufifo_st->ff_full(port->line))
1328 cpu_relax();
1329 wr_regb(port, ureg->sirfsoc_tx_fifo_data, ch);
1330 }
1331
1332 static void sirfsoc_uart_console_write(struct console *co, const char *s,
1333 unsigned int count)
1334 {
1335 struct uart_port *port = &sirfsoc_uart_ports[co->index].port;
1336 uart_console_write(port, s, count, sirfsoc_uart_console_putchar);
1337 }
1338
1339 static struct console sirfsoc_uart_console = {
1340 .name = SIRFSOC_UART_NAME,
1341 .device = uart_console_device,
1342 .flags = CON_PRINTBUFFER,
1343 .index = -1,
1344 .write = sirfsoc_uart_console_write,
1345 .setup = sirfsoc_uart_console_setup,
1346 .data = &sirfsoc_uart_drv,
1347 };
1348
1349 static int __init sirfsoc_uart_console_init(void)
1350 {
1351 register_console(&sirfsoc_uart_console);
1352 return 0;
1353 }
1354 console_initcall(sirfsoc_uart_console_init);
1355 #endif
1356
1357 static struct uart_driver sirfsoc_uart_drv = {
1358 .owner = THIS_MODULE,
1359 .driver_name = SIRFUART_PORT_NAME,
1360 .nr = SIRFSOC_UART_NR,
1361 .dev_name = SIRFSOC_UART_NAME,
1362 .major = SIRFSOC_UART_MAJOR,
1363 .minor = SIRFSOC_UART_MINOR,
1364 #ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE
1365 .cons = &sirfsoc_uart_console,
1366 #else
1367 .cons = NULL,
1368 #endif
1369 };
1370
1371 static struct of_device_id sirfsoc_uart_ids[] = {
1372 { .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,},
1373 { .compatible = "sirf,marco-uart", .data = &sirfsoc_uart},
1374 { .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp},
1375 {}
1376 };
1377 MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids);
1378
1379 static int sirfsoc_uart_probe(struct platform_device *pdev)
1380 {
1381 struct sirfsoc_uart_port *sirfport;
1382 struct uart_port *port;
1383 struct resource *res;
1384 int ret;
1385 const struct of_device_id *match;
1386
1387 match = of_match_node(sirfsoc_uart_ids, pdev->dev.of_node);
1388 if (of_property_read_u32(pdev->dev.of_node, "cell-index", &pdev->id)) {
1389 dev_err(&pdev->dev,
1390 "Unable to find cell-index in uart node.\n");
1391 ret = -EFAULT;
1392 goto err;
1393 }
1394 if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart"))
1395 pdev->id += ((struct sirfsoc_uart_register *)
1396 match->data)->uart_param.register_uart_nr;
1397 sirfport = &sirfsoc_uart_ports[pdev->id];
1398 port = &sirfport->port;
1399 port->dev = &pdev->dev;
1400 port->private_data = sirfport;
1401 sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data;
1402
1403 sirfport->hw_flow_ctrl = of_property_read_bool(pdev->dev.of_node,
1404 "sirf,uart-has-rtscts");
1405 if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart")) {
1406 sirfport->uart_reg->uart_type = SIRF_REAL_UART;
1407 if (of_property_read_u32(pdev->dev.of_node,
1408 "sirf,uart-dma-rx-channel",
1409 &sirfport->rx_dma_no))
1410 sirfport->rx_dma_no = UNVALID_DMA_CHAN;
1411 if (of_property_read_u32(pdev->dev.of_node,
1412 "sirf,uart-dma-tx-channel",
1413 &sirfport->tx_dma_no))
1414 sirfport->tx_dma_no = UNVALID_DMA_CHAN;
1415 }
1416 if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart")) {
1417 sirfport->uart_reg->uart_type = SIRF_USP_UART;
1418 if (of_property_read_u32(pdev->dev.of_node,
1419 "sirf,usp-dma-rx-channel",
1420 &sirfport->rx_dma_no))
1421 sirfport->rx_dma_no = UNVALID_DMA_CHAN;
1422 if (of_property_read_u32(pdev->dev.of_node,
1423 "sirf,usp-dma-tx-channel",
1424 &sirfport->tx_dma_no))
1425 sirfport->tx_dma_no = UNVALID_DMA_CHAN;
1426 if (!sirfport->hw_flow_ctrl)
1427 goto usp_no_flow_control;
1428 if (of_find_property(pdev->dev.of_node, "cts-gpios", NULL))
1429 sirfport->cts_gpio = of_get_named_gpio(
1430 pdev->dev.of_node, "cts-gpios", 0);
1431 else
1432 sirfport->cts_gpio = -1;
1433 if (of_find_property(pdev->dev.of_node, "rts-gpios", NULL))
1434 sirfport->rts_gpio = of_get_named_gpio(
1435 pdev->dev.of_node, "rts-gpios", 0);
1436 else
1437 sirfport->rts_gpio = -1;
1438
1439 if ((!gpio_is_valid(sirfport->cts_gpio) ||
1440 !gpio_is_valid(sirfport->rts_gpio))) {
1441 ret = -EINVAL;
1442 dev_err(&pdev->dev,
1443 "Usp flow control must have cts and rts gpio");
1444 goto err;
1445 }
1446 ret = devm_gpio_request(&pdev->dev, sirfport->cts_gpio,
1447 "usp-cts-gpio");
1448 if (ret) {
1449 dev_err(&pdev->dev, "Unable request cts gpio");
1450 goto err;
1451 }
1452 gpio_direction_input(sirfport->cts_gpio);
1453 ret = devm_gpio_request(&pdev->dev, sirfport->rts_gpio,
1454 "usp-rts-gpio");
1455 if (ret) {
1456 dev_err(&pdev->dev, "Unable request rts gpio");
1457 goto err;
1458 }
1459 gpio_direction_output(sirfport->rts_gpio, 1);
1460 }
1461 usp_no_flow_control:
1462 if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-uart"))
1463 sirfport->is_marco = true;
1464
1465 if (of_property_read_u32(pdev->dev.of_node,
1466 "fifosize",
1467 &port->fifosize)) {
1468 dev_err(&pdev->dev,
1469 "Unable to find fifosize in uart node.\n");
1470 ret = -EFAULT;
1471 goto err;
1472 }
1473
1474 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1475 if (res == NULL) {
1476 dev_err(&pdev->dev, "Insufficient resources.\n");
1477 ret = -EFAULT;
1478 goto err;
1479 }
1480 spin_lock_init(&sirfport->rx_lock);
1481 spin_lock_init(&sirfport->tx_lock);
1482 tasklet_init(&sirfport->rx_dma_complete_tasklet,
1483 sirfsoc_uart_rx_dma_complete_tl, (unsigned long)sirfport);
1484 tasklet_init(&sirfport->rx_tmo_process_tasklet,
1485 sirfsoc_rx_tmo_process_tl, (unsigned long)sirfport);
1486 port->mapbase = res->start;
1487 port->membase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
1488 if (!port->membase) {
1489 dev_err(&pdev->dev, "Cannot remap resource.\n");
1490 ret = -ENOMEM;
1491 goto err;
1492 }
1493 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1494 if (res == NULL) {
1495 dev_err(&pdev->dev, "Insufficient resources.\n");
1496 ret = -EFAULT;
1497 goto err;
1498 }
1499 port->irq = res->start;
1500
1501 sirfport->clk = clk_get(&pdev->dev, NULL);
1502 if (IS_ERR(sirfport->clk)) {
1503 ret = PTR_ERR(sirfport->clk);
1504 goto err;
1505 }
1506 port->uartclk = clk_get_rate(sirfport->clk);
1507
1508 port->ops = &sirfsoc_uart_ops;
1509 spin_lock_init(&port->lock);
1510
1511 platform_set_drvdata(pdev, sirfport);
1512 ret = uart_add_one_port(&sirfsoc_uart_drv, port);
1513 if (ret != 0) {
1514 dev_err(&pdev->dev, "Cannot add UART port(%d).\n", pdev->id);
1515 goto port_err;
1516 }
1517
1518 return 0;
1519
1520 port_err:
1521 clk_put(sirfport->clk);
1522 err:
1523 return ret;
1524 }
1525
1526 static int sirfsoc_uart_remove(struct platform_device *pdev)
1527 {
1528 struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev);
1529 struct uart_port *port = &sirfport->port;
1530 clk_put(sirfport->clk);
1531 uart_remove_one_port(&sirfsoc_uart_drv, port);
1532 return 0;
1533 }
1534
1535 #ifdef CONFIG_PM_SLEEP
1536 static int
1537 sirfsoc_uart_suspend(struct device *pdev)
1538 {
1539 struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev);
1540 struct uart_port *port = &sirfport->port;
1541 uart_suspend_port(&sirfsoc_uart_drv, port);
1542 return 0;
1543 }
1544
1545 static int sirfsoc_uart_resume(struct device *pdev)
1546 {
1547 struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev);
1548 struct uart_port *port = &sirfport->port;
1549 uart_resume_port(&sirfsoc_uart_drv, port);
1550 return 0;
1551 }
1552 #endif
1553
1554 static const struct dev_pm_ops sirfsoc_uart_pm_ops = {
1555 SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_uart_suspend, sirfsoc_uart_resume)
1556 };
1557
1558 static struct platform_driver sirfsoc_uart_driver = {
1559 .probe = sirfsoc_uart_probe,
1560 .remove = sirfsoc_uart_remove,
1561 .driver = {
1562 .name = SIRFUART_PORT_NAME,
1563 .owner = THIS_MODULE,
1564 .of_match_table = sirfsoc_uart_ids,
1565 .pm = &sirfsoc_uart_pm_ops,
1566 },
1567 };
1568
1569 static int __init sirfsoc_uart_init(void)
1570 {
1571 int ret = 0;
1572
1573 ret = uart_register_driver(&sirfsoc_uart_drv);
1574 if (ret)
1575 goto out;
1576
1577 ret = platform_driver_register(&sirfsoc_uart_driver);
1578 if (ret)
1579 uart_unregister_driver(&sirfsoc_uart_drv);
1580 out:
1581 return ret;
1582 }
1583 module_init(sirfsoc_uart_init);
1584
1585 static void __exit sirfsoc_uart_exit(void)
1586 {
1587 platform_driver_unregister(&sirfsoc_uart_driver);
1588 uart_unregister_driver(&sirfsoc_uart_drv);
1589 }
1590 module_exit(sirfsoc_uart_exit);
1591
1592 MODULE_LICENSE("GPL v2");
1593 MODULE_AUTHOR("Bin Shi <Bin.Shi@csr.com>, Rong Wang<Rong.Wang@csr.com>");
1594 MODULE_DESCRIPTION("CSR SiRFprimaII Uart Driver");
Linux with added FPC-III support