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