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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Driver for CSR SiRFprimaII onboard UARTs.
4 *
5 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
6 */
7
8#include <linux/module.h>
9#include <linux/ioport.h>
10#include <linux/platform_device.h>
11#include <linux/init.h>
12#include <linux/sysrq.h>
13#include <linux/console.h>
14#include <linux/tty.h>
15#include <linux/tty_flip.h>
16#include <linux/serial_core.h>
17#include <linux/serial.h>
18#include <linux/clk.h>
19#include <linux/of.h>
20#include <linux/slab.h>
21#include <linux/io.h>
22#include <linux/of_gpio.h>
23#include <linux/dmaengine.h>
24#include <linux/dma-direction.h>
25#include <linux/dma-mapping.h>
26#include <asm/irq.h>
27#include <asm/mach/irq.h>
28
29#include "sirfsoc_uart.h"
30
31static unsigned int
32sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count);
33static unsigned int
34sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count);
35static struct uart_driver sirfsoc_uart_drv;
36
37static void sirfsoc_uart_tx_dma_complete_callback(void *param);
38static const struct sirfsoc_baudrate_to_regv baudrate_to_regv[] = {
39 {4000000, 2359296},
40 {3500000, 1310721},
41 {3000000, 1572865},
42 {2500000, 1245186},
43 {2000000, 1572866},
44 {1500000, 1245188},
45 {1152000, 1638404},
46 {1000000, 1572869},
47 {921600, 1114120},
48 {576000, 1245196},
49 {500000, 1245198},
50 {460800, 1572876},
51 {230400, 1310750},
52 {115200, 1310781},
53 {57600, 1310843},
54 {38400, 1114328},
55 {19200, 1114545},
56 {9600, 1114979},
57};
58
59static struct sirfsoc_uart_port *sirf_ports[SIRFSOC_UART_NR];
60
61static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port)
62{
63 return container_of(port, struct sirfsoc_uart_port, port);
64}
65
66static inline unsigned int sirfsoc_uart_tx_empty(struct uart_port *port)
67{
68 unsigned long reg;
69 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
70 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
71 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
72 reg = rd_regl(port, ureg->sirfsoc_tx_fifo_status);
73 return (reg & ufifo_st->ff_empty(port)) ? TIOCSER_TEMT : 0;
74}
75
76static unsigned int sirfsoc_uart_get_mctrl(struct uart_port *port)
77{
78 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
79 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
80 if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled)
81 goto cts_asserted;
82 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
83 if (!(rd_regl(port, ureg->sirfsoc_afc_ctrl) &
84 SIRFUART_AFC_CTS_STATUS))
85 goto cts_asserted;
86 else
87 goto cts_deasserted;
88 } else {
89 if (!gpio_get_value(sirfport->cts_gpio))
90 goto cts_asserted;
91 else
92 goto cts_deasserted;
93 }
94cts_deasserted:
95 return TIOCM_CAR | TIOCM_DSR;
96cts_asserted:
97 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
98}
99
100static void sirfsoc_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
101{
102 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
103 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
104 unsigned int assert = mctrl & TIOCM_RTS;
105 unsigned int val = assert ? SIRFUART_AFC_CTRL_RX_THD : 0x0;
106 unsigned int current_val;
107
108 if (mctrl & TIOCM_LOOP) {
109 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART)
110 wr_regl(port, ureg->sirfsoc_line_ctrl,
111 rd_regl(port, ureg->sirfsoc_line_ctrl) |
112 SIRFUART_LOOP_BACK);
113 else
114 wr_regl(port, ureg->sirfsoc_mode1,
115 rd_regl(port, ureg->sirfsoc_mode1) |
116 SIRFSOC_USP_LOOP_BACK_CTRL);
117 } else {
118 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART)
119 wr_regl(port, ureg->sirfsoc_line_ctrl,
120 rd_regl(port, ureg->sirfsoc_line_ctrl) &
121 ~SIRFUART_LOOP_BACK);
122 else
123 wr_regl(port, ureg->sirfsoc_mode1,
124 rd_regl(port, ureg->sirfsoc_mode1) &
125 ~SIRFSOC_USP_LOOP_BACK_CTRL);
126 }
127
128 if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled)
129 return;
130 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
131 current_val = rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0xFF;
132 val |= current_val;
133 wr_regl(port, ureg->sirfsoc_afc_ctrl, val);
134 } else {
135 if (!val)
136 gpio_set_value(sirfport->rts_gpio, 1);
137 else
138 gpio_set_value(sirfport->rts_gpio, 0);
139 }
140}
141
142static void sirfsoc_uart_stop_tx(struct uart_port *port)
143{
144 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
145 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
146 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
147
148 if (sirfport->tx_dma_chan) {
149 if (sirfport->tx_dma_state == TX_DMA_RUNNING) {
150 dmaengine_pause(sirfport->tx_dma_chan);
151 sirfport->tx_dma_state = TX_DMA_PAUSE;
152 } else {
153 if (!sirfport->is_atlas7)
154 wr_regl(port, ureg->sirfsoc_int_en_reg,
155 rd_regl(port, ureg->sirfsoc_int_en_reg) &
156 ~uint_en->sirfsoc_txfifo_empty_en);
157 else
158 wr_regl(port, ureg->sirfsoc_int_en_clr_reg,
159 uint_en->sirfsoc_txfifo_empty_en);
160 }
161 } else {
162 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
163 wr_regl(port, ureg->sirfsoc_tx_rx_en, rd_regl(port,
164 ureg->sirfsoc_tx_rx_en) & ~SIRFUART_TX_EN);
165 if (!sirfport->is_atlas7)
166 wr_regl(port, ureg->sirfsoc_int_en_reg,
167 rd_regl(port, ureg->sirfsoc_int_en_reg) &
168 ~uint_en->sirfsoc_txfifo_empty_en);
169 else
170 wr_regl(port, ureg->sirfsoc_int_en_clr_reg,
171 uint_en->sirfsoc_txfifo_empty_en);
172 }
173}
174
175static void sirfsoc_uart_tx_with_dma(struct sirfsoc_uart_port *sirfport)
176{
177 struct uart_port *port = &sirfport->port;
178 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
179 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
180 struct circ_buf *xmit = &port->state->xmit;
181 unsigned long tran_size;
182 unsigned long tran_start;
183 unsigned long pio_tx_size;
184
185 tran_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
186 tran_start = (unsigned long)(xmit->buf + xmit->tail);
187 if (uart_circ_empty(xmit) || uart_tx_stopped(port) ||
188 !tran_size)
189 return;
190 if (sirfport->tx_dma_state == TX_DMA_PAUSE) {
191 dmaengine_resume(sirfport->tx_dma_chan);
192 return;
193 }
194 if (sirfport->tx_dma_state == TX_DMA_RUNNING)
195 return;
196 if (!sirfport->is_atlas7)
197 wr_regl(port, ureg->sirfsoc_int_en_reg,
198 rd_regl(port, ureg->sirfsoc_int_en_reg)&
199 ~(uint_en->sirfsoc_txfifo_empty_en));
200 else
201 wr_regl(port, ureg->sirfsoc_int_en_clr_reg,
202 uint_en->sirfsoc_txfifo_empty_en);
203 /*
204 * DMA requires buffer address and buffer length are both aligned with
205 * 4 bytes, so we use PIO for
206 * 1. if address is not aligned with 4bytes, use PIO for the first 1~3
207 * bytes, and move to DMA for the left part aligned with 4bytes
208 * 2. if buffer length is not aligned with 4bytes, use DMA for aligned
209 * part first, move to PIO for the left 1~3 bytes
210 */
211 if (tran_size < 4 || BYTES_TO_ALIGN(tran_start)) {
212 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP);
213 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
214 rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)|
215 SIRFUART_IO_MODE);
216 if (BYTES_TO_ALIGN(tran_start)) {
217 pio_tx_size = sirfsoc_uart_pio_tx_chars(sirfport,
218 BYTES_TO_ALIGN(tran_start));
219 tran_size -= pio_tx_size;
220 }
221 if (tran_size < 4)
222 sirfsoc_uart_pio_tx_chars(sirfport, tran_size);
223 if (!sirfport->is_atlas7)
224 wr_regl(port, ureg->sirfsoc_int_en_reg,
225 rd_regl(port, ureg->sirfsoc_int_en_reg)|
226 uint_en->sirfsoc_txfifo_empty_en);
227 else
228 wr_regl(port, ureg->sirfsoc_int_en_reg,
229 uint_en->sirfsoc_txfifo_empty_en);
230 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
231 } else {
232 /* tx transfer mode switch into dma mode */
233 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP);
234 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
235 rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)&
236 ~SIRFUART_IO_MODE);
237 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
238 tran_size &= ~(0x3);
239
240 sirfport->tx_dma_addr = dma_map_single(port->dev,
241 xmit->buf + xmit->tail,
242 tran_size, DMA_TO_DEVICE);
243 sirfport->tx_dma_desc = dmaengine_prep_slave_single(
244 sirfport->tx_dma_chan, sirfport->tx_dma_addr,
245 tran_size, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
246 if (!sirfport->tx_dma_desc) {
247 dev_err(port->dev, "DMA prep slave single fail\n");
248 return;
249 }
250 sirfport->tx_dma_desc->callback =
251 sirfsoc_uart_tx_dma_complete_callback;
252 sirfport->tx_dma_desc->callback_param = (void *)sirfport;
253 sirfport->transfer_size = tran_size;
254
255 dmaengine_submit(sirfport->tx_dma_desc);
256 dma_async_issue_pending(sirfport->tx_dma_chan);
257 sirfport->tx_dma_state = TX_DMA_RUNNING;
258 }
259}
260
261static void sirfsoc_uart_start_tx(struct uart_port *port)
262{
263 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
264 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
265 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
266 if (sirfport->tx_dma_chan)
267 sirfsoc_uart_tx_with_dma(sirfport);
268 else {
269 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
270 wr_regl(port, ureg->sirfsoc_tx_rx_en, rd_regl(port,
271 ureg->sirfsoc_tx_rx_en) | SIRFUART_TX_EN);
272 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP);
273 sirfsoc_uart_pio_tx_chars(sirfport, port->fifosize);
274 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
275 if (!sirfport->is_atlas7)
276 wr_regl(port, ureg->sirfsoc_int_en_reg,
277 rd_regl(port, ureg->sirfsoc_int_en_reg)|
278 uint_en->sirfsoc_txfifo_empty_en);
279 else
280 wr_regl(port, ureg->sirfsoc_int_en_reg,
281 uint_en->sirfsoc_txfifo_empty_en);
282 }
283}
284
285static void sirfsoc_uart_stop_rx(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
291 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
292 if (sirfport->rx_dma_chan) {
293 if (!sirfport->is_atlas7)
294 wr_regl(port, ureg->sirfsoc_int_en_reg,
295 rd_regl(port, ureg->sirfsoc_int_en_reg) &
296 ~(SIRFUART_RX_DMA_INT_EN(uint_en,
297 sirfport->uart_reg->uart_type) |
298 uint_en->sirfsoc_rx_done_en));
299 else
300 wr_regl(port, ureg->sirfsoc_int_en_clr_reg,
301 SIRFUART_RX_DMA_INT_EN(uint_en,
302 sirfport->uart_reg->uart_type)|
303 uint_en->sirfsoc_rx_done_en);
304 dmaengine_terminate_all(sirfport->rx_dma_chan);
305 } else {
306 if (!sirfport->is_atlas7)
307 wr_regl(port, ureg->sirfsoc_int_en_reg,
308 rd_regl(port, ureg->sirfsoc_int_en_reg)&
309 ~(SIRFUART_RX_IO_INT_EN(uint_en,
310 sirfport->uart_reg->uart_type)));
311 else
312 wr_regl(port, ureg->sirfsoc_int_en_clr_reg,
313 SIRFUART_RX_IO_INT_EN(uint_en,
314 sirfport->uart_reg->uart_type));
315 }
316}
317
318static void sirfsoc_uart_disable_ms(struct uart_port *port)
319{
320 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
321 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
322 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
323
324 if (!sirfport->hw_flow_ctrl)
325 return;
326 sirfport->ms_enabled = false;
327 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
328 wr_regl(port, ureg->sirfsoc_afc_ctrl,
329 rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0x3FF);
330 if (!sirfport->is_atlas7)
331 wr_regl(port, ureg->sirfsoc_int_en_reg,
332 rd_regl(port, ureg->sirfsoc_int_en_reg)&
333 ~uint_en->sirfsoc_cts_en);
334 else
335 wr_regl(port, ureg->sirfsoc_int_en_clr_reg,
336 uint_en->sirfsoc_cts_en);
337 } else
338 disable_irq(gpio_to_irq(sirfport->cts_gpio));
339}
340
341static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id)
342{
343 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
344 struct uart_port *port = &sirfport->port;
345 spin_lock(&port->lock);
346 if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled)
347 uart_handle_cts_change(port,
348 !gpio_get_value(sirfport->cts_gpio));
349 spin_unlock(&port->lock);
350 return IRQ_HANDLED;
351}
352
353static void sirfsoc_uart_enable_ms(struct uart_port *port)
354{
355 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
356 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
357 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
358
359 if (!sirfport->hw_flow_ctrl)
360 return;
361 sirfport->ms_enabled = true;
362 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
363 wr_regl(port, ureg->sirfsoc_afc_ctrl,
364 rd_regl(port, ureg->sirfsoc_afc_ctrl) |
365 SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN |
366 SIRFUART_AFC_CTRL_RX_THD);
367 if (!sirfport->is_atlas7)
368 wr_regl(port, ureg->sirfsoc_int_en_reg,
369 rd_regl(port, ureg->sirfsoc_int_en_reg)
370 | uint_en->sirfsoc_cts_en);
371 else
372 wr_regl(port, ureg->sirfsoc_int_en_reg,
373 uint_en->sirfsoc_cts_en);
374 } else
375 enable_irq(gpio_to_irq(sirfport->cts_gpio));
376}
377
378static void sirfsoc_uart_break_ctl(struct uart_port *port, int break_state)
379{
380 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
381 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
382 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
383 unsigned long ulcon = rd_regl(port, ureg->sirfsoc_line_ctrl);
384 if (break_state)
385 ulcon |= SIRFUART_SET_BREAK;
386 else
387 ulcon &= ~SIRFUART_SET_BREAK;
388 wr_regl(port, ureg->sirfsoc_line_ctrl, ulcon);
389 }
390}
391
392static unsigned int
393sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
394{
395 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
396 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
397 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
398 unsigned int ch, rx_count = 0;
399 struct tty_struct *tty;
400 tty = tty_port_tty_get(&port->state->port);
401 if (!tty)
402 return -ENODEV;
403 while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) &
404 ufifo_st->ff_empty(port))) {
405 ch = rd_regl(port, ureg->sirfsoc_rx_fifo_data) |
406 SIRFUART_DUMMY_READ;
407 if (unlikely(uart_handle_sysrq_char(port, ch)))
408 continue;
409 uart_insert_char(port, 0, 0, ch, TTY_NORMAL);
410 rx_count++;
411 if (rx_count >= max_rx_count)
412 break;
413 }
414
415 port->icount.rx += rx_count;
416
417 return rx_count;
418}
419
420static unsigned int
421sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count)
422{
423 struct uart_port *port = &sirfport->port;
424 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
425 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
426 struct circ_buf *xmit = &port->state->xmit;
427 unsigned int num_tx = 0;
428 while (!uart_circ_empty(xmit) &&
429 !(rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
430 ufifo_st->ff_full(port)) &&
431 count--) {
432 wr_regl(port, ureg->sirfsoc_tx_fifo_data,
433 xmit->buf[xmit->tail]);
434 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
435 port->icount.tx++;
436 num_tx++;
437 }
438 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
439 uart_write_wakeup(port);
440 return num_tx;
441}
442
443static void sirfsoc_uart_tx_dma_complete_callback(void *param)
444{
445 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
446 struct uart_port *port = &sirfport->port;
447 struct circ_buf *xmit = &port->state->xmit;
448 unsigned long flags;
449
450 spin_lock_irqsave(&port->lock, flags);
451 xmit->tail = (xmit->tail + sirfport->transfer_size) &
452 (UART_XMIT_SIZE - 1);
453 port->icount.tx += sirfport->transfer_size;
454 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
455 uart_write_wakeup(port);
456 if (sirfport->tx_dma_addr)
457 dma_unmap_single(port->dev, sirfport->tx_dma_addr,
458 sirfport->transfer_size, DMA_TO_DEVICE);
459 sirfport->tx_dma_state = TX_DMA_IDLE;
460 sirfsoc_uart_tx_with_dma(sirfport);
461 spin_unlock_irqrestore(&port->lock, flags);
462}
463
464static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
465{
466 unsigned long intr_status;
467 unsigned long cts_status;
468 unsigned long flag = TTY_NORMAL;
469 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
470 struct uart_port *port = &sirfport->port;
471 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
472 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
473 struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
474 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
475 struct uart_state *state = port->state;
476 struct circ_buf *xmit = &port->state->xmit;
477 spin_lock(&port->lock);
478 intr_status = rd_regl(port, ureg->sirfsoc_int_st_reg);
479 wr_regl(port, ureg->sirfsoc_int_st_reg, intr_status);
480 intr_status &= rd_regl(port, ureg->sirfsoc_int_en_reg);
481 if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT(uint_st,
482 sirfport->uart_reg->uart_type)))) {
483 if (intr_status & uint_st->sirfsoc_rxd_brk) {
484 port->icount.brk++;
485 if (uart_handle_break(port))
486 goto recv_char;
487 }
488 if (intr_status & uint_st->sirfsoc_rx_oflow) {
489 port->icount.overrun++;
490 flag = TTY_OVERRUN;
491 }
492 if (intr_status & uint_st->sirfsoc_frm_err) {
493 port->icount.frame++;
494 flag = TTY_FRAME;
495 }
496 if (intr_status & uint_st->sirfsoc_parity_err) {
497 port->icount.parity++;
498 flag = TTY_PARITY;
499 }
500 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
501 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
502 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
503 intr_status &= port->read_status_mask;
504 uart_insert_char(port, intr_status,
505 uint_en->sirfsoc_rx_oflow_en, 0, flag);
506 }
507recv_char:
508 if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) &&
509 (intr_status & SIRFUART_CTS_INT_ST(uint_st)) &&
510 !sirfport->tx_dma_state) {
511 cts_status = rd_regl(port, ureg->sirfsoc_afc_ctrl) &
512 SIRFUART_AFC_CTS_STATUS;
513 if (cts_status != 0)
514 cts_status = 0;
515 else
516 cts_status = 1;
517 uart_handle_cts_change(port, cts_status);
518 wake_up_interruptible(&state->port.delta_msr_wait);
519 }
520 if (!sirfport->rx_dma_chan &&
521 (intr_status & SIRFUART_RX_IO_INT_ST(uint_st))) {
522 /*
523 * chip will trigger continuous RX_TIMEOUT interrupt
524 * in RXFIFO empty and not trigger if RXFIFO recevice
525 * data in limit time, original method use RX_TIMEOUT
526 * will trigger lots of useless interrupt in RXFIFO
527 * empty.RXFIFO received one byte will trigger RX_DONE
528 * interrupt.use RX_DONE to wait for data received
529 * into RXFIFO, use RX_THD/RX_FULL for lots data receive
530 * and use RX_TIMEOUT for the last left data.
531 */
532 if (intr_status & uint_st->sirfsoc_rx_done) {
533 if (!sirfport->is_atlas7) {
534 wr_regl(port, ureg->sirfsoc_int_en_reg,
535 rd_regl(port, ureg->sirfsoc_int_en_reg)
536 & ~(uint_en->sirfsoc_rx_done_en));
537 wr_regl(port, ureg->sirfsoc_int_en_reg,
538 rd_regl(port, ureg->sirfsoc_int_en_reg)
539 | (uint_en->sirfsoc_rx_timeout_en));
540 } else {
541 wr_regl(port, ureg->sirfsoc_int_en_clr_reg,
542 uint_en->sirfsoc_rx_done_en);
543 wr_regl(port, ureg->sirfsoc_int_en_reg,
544 uint_en->sirfsoc_rx_timeout_en);
545 }
546 } else {
547 if (intr_status & uint_st->sirfsoc_rx_timeout) {
548 if (!sirfport->is_atlas7) {
549 wr_regl(port, ureg->sirfsoc_int_en_reg,
550 rd_regl(port, ureg->sirfsoc_int_en_reg)
551 & ~(uint_en->sirfsoc_rx_timeout_en));
552 wr_regl(port, ureg->sirfsoc_int_en_reg,
553 rd_regl(port, ureg->sirfsoc_int_en_reg)
554 | (uint_en->sirfsoc_rx_done_en));
555 } else {
556 wr_regl(port,
557 ureg->sirfsoc_int_en_clr_reg,
558 uint_en->sirfsoc_rx_timeout_en);
559 wr_regl(port, ureg->sirfsoc_int_en_reg,
560 uint_en->sirfsoc_rx_done_en);
561 }
562 }
563 sirfsoc_uart_pio_rx_chars(port, port->fifosize);
564 }
565 }
566 spin_unlock(&port->lock);
567 tty_flip_buffer_push(&state->port);
568 spin_lock(&port->lock);
569 if (intr_status & uint_st->sirfsoc_txfifo_empty) {
570 if (sirfport->tx_dma_chan)
571 sirfsoc_uart_tx_with_dma(sirfport);
572 else {
573 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
574 spin_unlock(&port->lock);
575 return IRQ_HANDLED;
576 } else {
577 sirfsoc_uart_pio_tx_chars(sirfport,
578 port->fifosize);
579 if ((uart_circ_empty(xmit)) &&
580 (rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
581 ufifo_st->ff_empty(port)))
582 sirfsoc_uart_stop_tx(port);
583 }
584 }
585 }
586 spin_unlock(&port->lock);
587
588 return IRQ_HANDLED;
589}
590
591static void sirfsoc_uart_rx_dma_complete_callback(void *param)
592{
593}
594
595/* submit rx dma task into dmaengine */
596static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
597{
598 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
599 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
600 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
601 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
602 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
603 ~SIRFUART_IO_MODE);
604 sirfport->rx_dma_items.xmit.tail =
605 sirfport->rx_dma_items.xmit.head = 0;
606 sirfport->rx_dma_items.desc =
607 dmaengine_prep_dma_cyclic(sirfport->rx_dma_chan,
608 sirfport->rx_dma_items.dma_addr, SIRFSOC_RX_DMA_BUF_SIZE,
609 SIRFSOC_RX_DMA_BUF_SIZE / 2,
610 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
611 if (IS_ERR_OR_NULL(sirfport->rx_dma_items.desc)) {
612 dev_err(port->dev, "DMA slave single fail\n");
613 return;
614 }
615 sirfport->rx_dma_items.desc->callback =
616 sirfsoc_uart_rx_dma_complete_callback;
617 sirfport->rx_dma_items.desc->callback_param = sirfport;
618 sirfport->rx_dma_items.cookie =
619 dmaengine_submit(sirfport->rx_dma_items.desc);
620 dma_async_issue_pending(sirfport->rx_dma_chan);
621 if (!sirfport->is_atlas7)
622 wr_regl(port, ureg->sirfsoc_int_en_reg,
623 rd_regl(port, ureg->sirfsoc_int_en_reg) |
624 SIRFUART_RX_DMA_INT_EN(uint_en,
625 sirfport->uart_reg->uart_type));
626 else
627 wr_regl(port, ureg->sirfsoc_int_en_reg,
628 SIRFUART_RX_DMA_INT_EN(uint_en,
629 sirfport->uart_reg->uart_type));
630}
631
632static unsigned int
633sirfsoc_usp_calc_sample_div(unsigned long set_rate,
634 unsigned long ioclk_rate, unsigned long *sample_reg)
635{
636 unsigned long min_delta = ~0UL;
637 unsigned short sample_div;
638 unsigned long ioclk_div = 0;
639 unsigned long temp_delta;
640
641 for (sample_div = SIRF_USP_MIN_SAMPLE_DIV;
642 sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) {
643 temp_delta = ioclk_rate -
644 (ioclk_rate + (set_rate * sample_div) / 2)
645 / (set_rate * sample_div) * set_rate * sample_div;
646
647 temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta;
648 if (temp_delta < min_delta) {
649 ioclk_div = (2 * ioclk_rate /
650 (set_rate * sample_div) + 1) / 2 - 1;
651 if (ioclk_div > SIRF_IOCLK_DIV_MAX)
652 continue;
653 min_delta = temp_delta;
654 *sample_reg = sample_div;
655 if (!temp_delta)
656 break;
657 }
658 }
659 return ioclk_div;
660}
661
662static unsigned int
663sirfsoc_uart_calc_sample_div(unsigned long baud_rate,
664 unsigned long ioclk_rate, unsigned long *set_baud)
665{
666 unsigned long min_delta = ~0UL;
667 unsigned short sample_div;
668 unsigned int regv = 0;
669 unsigned long ioclk_div;
670 unsigned long baud_tmp;
671 int temp_delta;
672
673 for (sample_div = SIRF_MIN_SAMPLE_DIV;
674 sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) {
675 ioclk_div = (ioclk_rate / (baud_rate * (sample_div + 1))) - 1;
676 if (ioclk_div > SIRF_IOCLK_DIV_MAX)
677 continue;
678 baud_tmp = ioclk_rate / ((ioclk_div + 1) * (sample_div + 1));
679 temp_delta = baud_tmp - baud_rate;
680 temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta;
681 if (temp_delta < min_delta) {
682 regv = regv & (~SIRF_IOCLK_DIV_MASK);
683 regv = regv | ioclk_div;
684 regv = regv & (~SIRF_SAMPLE_DIV_MASK);
685 regv = regv | (sample_div << SIRF_SAMPLE_DIV_SHIFT);
686 min_delta = temp_delta;
687 *set_baud = baud_tmp;
688 }
689 }
690 return regv;
691}
692
693static void sirfsoc_uart_set_termios(struct uart_port *port,
694 struct ktermios *termios,
695 struct ktermios *old)
696{
697 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
698 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
699 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
700 unsigned long config_reg = 0;
701 unsigned long baud_rate;
702 unsigned long set_baud;
703 unsigned long flags;
704 unsigned long ic;
705 unsigned int clk_div_reg = 0;
706 unsigned long txfifo_op_reg, ioclk_rate;
707 unsigned long rx_time_out;
708 int threshold_div;
709 u32 data_bit_len, stop_bit_len, len_val;
710 unsigned long sample_div_reg = 0xf;
711 ioclk_rate = port->uartclk;
712
713 switch (termios->c_cflag & CSIZE) {
714 default:
715 case CS8:
716 data_bit_len = 8;
717 config_reg |= SIRFUART_DATA_BIT_LEN_8;
718 break;
719 case CS7:
720 data_bit_len = 7;
721 config_reg |= SIRFUART_DATA_BIT_LEN_7;
722 break;
723 case CS6:
724 data_bit_len = 6;
725 config_reg |= SIRFUART_DATA_BIT_LEN_6;
726 break;
727 case CS5:
728 data_bit_len = 5;
729 config_reg |= SIRFUART_DATA_BIT_LEN_5;
730 break;
731 }
732 if (termios->c_cflag & CSTOPB) {
733 config_reg |= SIRFUART_STOP_BIT_LEN_2;
734 stop_bit_len = 2;
735 } else
736 stop_bit_len = 1;
737
738 spin_lock_irqsave(&port->lock, flags);
739 port->read_status_mask = uint_en->sirfsoc_rx_oflow_en;
740 port->ignore_status_mask = 0;
741 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
742 if (termios->c_iflag & INPCK)
743 port->read_status_mask |= uint_en->sirfsoc_frm_err_en |
744 uint_en->sirfsoc_parity_err_en;
745 } else {
746 if (termios->c_iflag & INPCK)
747 port->read_status_mask |= uint_en->sirfsoc_frm_err_en;
748 }
749 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
750 port->read_status_mask |= uint_en->sirfsoc_rxd_brk_en;
751 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
752 if (termios->c_iflag & IGNPAR)
753 port->ignore_status_mask |=
754 uint_en->sirfsoc_frm_err_en |
755 uint_en->sirfsoc_parity_err_en;
756 if (termios->c_cflag & PARENB) {
757 if (termios->c_cflag & CMSPAR) {
758 if (termios->c_cflag & PARODD)
759 config_reg |= SIRFUART_STICK_BIT_MARK;
760 else
761 config_reg |= SIRFUART_STICK_BIT_SPACE;
762 } else {
763 if (termios->c_cflag & PARODD)
764 config_reg |= SIRFUART_STICK_BIT_ODD;
765 else
766 config_reg |= SIRFUART_STICK_BIT_EVEN;
767 }
768 }
769 } else {
770 if (termios->c_iflag & IGNPAR)
771 port->ignore_status_mask |=
772 uint_en->sirfsoc_frm_err_en;
773 if (termios->c_cflag & PARENB)
774 dev_warn(port->dev,
775 "USP-UART not support parity err\n");
776 }
777 if (termios->c_iflag & IGNBRK) {
778 port->ignore_status_mask |=
779 uint_en->sirfsoc_rxd_brk_en;
780 if (termios->c_iflag & IGNPAR)
781 port->ignore_status_mask |=
782 uint_en->sirfsoc_rx_oflow_en;
783 }
784 if ((termios->c_cflag & CREAD) == 0)
785 port->ignore_status_mask |= SIRFUART_DUMMY_READ;
786 /* Hardware Flow Control Settings */
787 if (UART_ENABLE_MS(port, termios->c_cflag)) {
788 if (!sirfport->ms_enabled)
789 sirfsoc_uart_enable_ms(port);
790 } else {
791 if (sirfport->ms_enabled)
792 sirfsoc_uart_disable_ms(port);
793 }
794 baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000);
795 if (ioclk_rate == 150000000) {
796 for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
797 if (baud_rate == baudrate_to_regv[ic].baud_rate)
798 clk_div_reg = baudrate_to_regv[ic].reg_val;
799 }
800 set_baud = baud_rate;
801 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
802 if (unlikely(clk_div_reg == 0))
803 clk_div_reg = sirfsoc_uart_calc_sample_div(baud_rate,
804 ioclk_rate, &set_baud);
805 wr_regl(port, ureg->sirfsoc_divisor, clk_div_reg);
806 } else {
807 clk_div_reg = sirfsoc_usp_calc_sample_div(baud_rate,
808 ioclk_rate, &sample_div_reg);
809 sample_div_reg--;
810 set_baud = ((ioclk_rate / (clk_div_reg+1) - 1) /
811 (sample_div_reg + 1));
812 /* setting usp mode 2 */
813 len_val = ((1 << SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET) |
814 (1 << SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET));
815 len_val |= ((clk_div_reg & SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK)
816 << SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET);
817 wr_regl(port, ureg->sirfsoc_mode2, len_val);
818 }
819 if (tty_termios_baud_rate(termios))
820 tty_termios_encode_baud_rate(termios, set_baud, set_baud);
821 /* set receive timeout && data bits len */
822 rx_time_out = SIRFSOC_UART_RX_TIMEOUT(set_baud, 20000);
823 rx_time_out = SIRFUART_RECV_TIMEOUT_VALUE(rx_time_out);
824 txfifo_op_reg = rd_regl(port, ureg->sirfsoc_tx_fifo_op);
825 wr_regl(port, ureg->sirfsoc_tx_fifo_op,
826 (txfifo_op_reg & ~SIRFUART_FIFO_START));
827 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
828 config_reg |= SIRFUART_UART_RECV_TIMEOUT(rx_time_out);
829 wr_regl(port, ureg->sirfsoc_line_ctrl, config_reg);
830 } else {
831 /*tx frame ctrl*/
832 len_val = (data_bit_len - 1) << SIRFSOC_USP_TX_DATA_LEN_OFFSET;
833 len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
834 SIRFSOC_USP_TX_FRAME_LEN_OFFSET;
835 len_val |= ((data_bit_len - 1) <<
836 SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET);
837 len_val |= (((clk_div_reg & 0xc00) >> 10) <<
838 SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET);
839 wr_regl(port, ureg->sirfsoc_tx_frame_ctrl, len_val);
840 /*rx frame ctrl*/
841 len_val = (data_bit_len - 1) << SIRFSOC_USP_RX_DATA_LEN_OFFSET;
842 len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
843 SIRFSOC_USP_RX_FRAME_LEN_OFFSET;
844 len_val |= (data_bit_len - 1) <<
845 SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET;
846 len_val |= (((clk_div_reg & 0xf000) >> 12) <<
847 SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET);
848 wr_regl(port, ureg->sirfsoc_rx_frame_ctrl, len_val);
849 /*async param*/
850 wr_regl(port, ureg->sirfsoc_async_param_reg,
851 (SIRFUART_USP_RECV_TIMEOUT(rx_time_out)) |
852 (sample_div_reg & SIRFSOC_USP_ASYNC_DIV2_MASK) <<
853 SIRFSOC_USP_ASYNC_DIV2_OFFSET);
854 }
855 if (sirfport->tx_dma_chan)
856 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_DMA_MODE);
857 else
858 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE);
859 if (sirfport->rx_dma_chan)
860 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
861 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
862 ~SIRFUART_IO_MODE);
863 else
864 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
865 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
866 SIRFUART_IO_MODE);
867 sirfport->rx_period_time = 20000000;
868 /* Reset Rx/Tx FIFO Threshold level for proper baudrate */
869 if (set_baud < 1000000)
870 threshold_div = 1;
871 else
872 threshold_div = 2;
873 wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl,
874 SIRFUART_FIFO_THD(port) / threshold_div);
875 wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl,
876 SIRFUART_FIFO_THD(port) / threshold_div);
877 txfifo_op_reg |= SIRFUART_FIFO_START;
878 wr_regl(port, ureg->sirfsoc_tx_fifo_op, txfifo_op_reg);
879 uart_update_timeout(port, termios->c_cflag, set_baud);
880 wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_TX_EN | SIRFUART_RX_EN);
881 spin_unlock_irqrestore(&port->lock, flags);
882}
883
884static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state,
885 unsigned int oldstate)
886{
887 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
888 if (!state)
889 clk_prepare_enable(sirfport->clk);
890 else
891 clk_disable_unprepare(sirfport->clk);
892}
893
894static int sirfsoc_uart_startup(struct uart_port *port)
895{
896 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
897 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
898 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
899 unsigned int index = port->line;
900 int ret;
901 irq_modify_status(port->irq, IRQ_NOREQUEST, IRQ_NOAUTOEN);
902 ret = request_irq(port->irq,
903 sirfsoc_uart_isr,
904 0,
905 SIRFUART_PORT_NAME,
906 sirfport);
907 if (ret != 0) {
908 dev_err(port->dev, "UART%d request IRQ line (%d) failed.\n",
909 index, port->irq);
910 goto irq_err;
911 }
912 /* initial hardware settings */
913 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
914 rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl) |
915 SIRFUART_IO_MODE);
916 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
917 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
918 SIRFUART_IO_MODE);
919 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
920 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
921 ~SIRFUART_RX_DMA_FLUSH);
922 wr_regl(port, ureg->sirfsoc_tx_dma_io_len, 0);
923 wr_regl(port, ureg->sirfsoc_rx_dma_io_len, 0);
924 wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_RX_EN | SIRFUART_TX_EN);
925 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
926 wr_regl(port, ureg->sirfsoc_mode1,
927 SIRFSOC_USP_ENDIAN_CTRL_LSBF |
928 SIRFSOC_USP_EN);
929 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_RESET);
930 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
931 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
932 wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, SIRFUART_FIFO_THD(port));
933 wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port));
934 if (sirfport->rx_dma_chan)
935 wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk,
936 SIRFUART_RX_FIFO_CHK_SC(port->line, 0x1) |
937 SIRFUART_RX_FIFO_CHK_LC(port->line, 0x2) |
938 SIRFUART_RX_FIFO_CHK_HC(port->line, 0x4));
939 if (sirfport->tx_dma_chan) {
940 sirfport->tx_dma_state = TX_DMA_IDLE;
941 wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk,
942 SIRFUART_TX_FIFO_CHK_SC(port->line, 0x1b) |
943 SIRFUART_TX_FIFO_CHK_LC(port->line, 0xe) |
944 SIRFUART_TX_FIFO_CHK_HC(port->line, 0x4));
945 }
946 sirfport->ms_enabled = false;
947 if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
948 sirfport->hw_flow_ctrl) {
949 irq_modify_status(gpio_to_irq(sirfport->cts_gpio),
950 IRQ_NOREQUEST, IRQ_NOAUTOEN);
951 ret = request_irq(gpio_to_irq(sirfport->cts_gpio),
952 sirfsoc_uart_usp_cts_handler, IRQF_TRIGGER_FALLING |
953 IRQF_TRIGGER_RISING, "usp_cts_irq", sirfport);
954 if (ret != 0) {
955 dev_err(port->dev, "UART-USP:request gpio irq fail\n");
956 goto init_rx_err;
957 }
958 }
959 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART &&
960 sirfport->rx_dma_chan)
961 wr_regl(port, ureg->sirfsoc_swh_dma_io,
962 SIRFUART_CLEAR_RX_ADDR_EN);
963 if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
964 sirfport->rx_dma_chan)
965 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
966 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
967 SIRFSOC_USP_FRADDR_CLR_EN);
968 if (sirfport->rx_dma_chan && !sirfport->is_hrt_enabled) {
969 sirfport->is_hrt_enabled = true;
970 sirfport->rx_period_time = 20000000;
971 sirfport->rx_last_pos = -1;
972 sirfport->pio_fetch_cnt = 0;
973 sirfport->rx_dma_items.xmit.tail =
974 sirfport->rx_dma_items.xmit.head = 0;
975 hrtimer_start(&sirfport->hrt,
976 ns_to_ktime(sirfport->rx_period_time),
977 HRTIMER_MODE_REL);
978 }
979 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
980 if (sirfport->rx_dma_chan)
981 sirfsoc_uart_start_next_rx_dma(port);
982 else {
983 if (!sirfport->is_atlas7)
984 wr_regl(port, ureg->sirfsoc_int_en_reg,
985 rd_regl(port, ureg->sirfsoc_int_en_reg) |
986 SIRFUART_RX_IO_INT_EN(uint_en,
987 sirfport->uart_reg->uart_type));
988 else
989 wr_regl(port, ureg->sirfsoc_int_en_reg,
990 SIRFUART_RX_IO_INT_EN(uint_en,
991 sirfport->uart_reg->uart_type));
992 }
993 enable_irq(port->irq);
994
995 return 0;
996init_rx_err:
997 free_irq(port->irq, sirfport);
998irq_err:
999 return ret;
1000}
1001
1002static void sirfsoc_uart_shutdown(struct uart_port *port)
1003{
1004 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1005 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1006 struct circ_buf *xmit;
1007
1008 xmit = &sirfport->rx_dma_items.xmit;
1009 if (!sirfport->is_atlas7)
1010 wr_regl(port, ureg->sirfsoc_int_en_reg, 0);
1011 else
1012 wr_regl(port, ureg->sirfsoc_int_en_clr_reg, ~0UL);
1013
1014 free_irq(port->irq, sirfport);
1015 if (sirfport->ms_enabled)
1016 sirfsoc_uart_disable_ms(port);
1017 if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
1018 sirfport->hw_flow_ctrl) {
1019 gpio_set_value(sirfport->rts_gpio, 1);
1020 free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport);
1021 }
1022 if (sirfport->tx_dma_chan)
1023 sirfport->tx_dma_state = TX_DMA_IDLE;
1024 if (sirfport->rx_dma_chan && sirfport->is_hrt_enabled) {
1025 while (((rd_regl(port, ureg->sirfsoc_rx_fifo_status) &
1026 SIRFUART_RX_FIFO_MASK) > sirfport->pio_fetch_cnt) &&
1027 !CIRC_CNT(xmit->head, xmit->tail,
1028 SIRFSOC_RX_DMA_BUF_SIZE))
1029 ;
1030 sirfport->is_hrt_enabled = false;
1031 hrtimer_cancel(&sirfport->hrt);
1032 }
1033}
1034
1035static const char *sirfsoc_uart_type(struct uart_port *port)
1036{
1037 return port->type == SIRFSOC_PORT_TYPE ? SIRFUART_PORT_NAME : NULL;
1038}
1039
1040static int sirfsoc_uart_request_port(struct uart_port *port)
1041{
1042 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1043 struct sirfsoc_uart_param *uart_param = &sirfport->uart_reg->uart_param;
1044 void *ret;
1045 ret = request_mem_region(port->mapbase,
1046 SIRFUART_MAP_SIZE, uart_param->port_name);
1047 return ret ? 0 : -EBUSY;
1048}
1049
1050static void sirfsoc_uart_release_port(struct uart_port *port)
1051{
1052 release_mem_region(port->mapbase, SIRFUART_MAP_SIZE);
1053}
1054
1055static void sirfsoc_uart_config_port(struct uart_port *port, int flags)
1056{
1057 if (flags & UART_CONFIG_TYPE) {
1058 port->type = SIRFSOC_PORT_TYPE;
1059 sirfsoc_uart_request_port(port);
1060 }
1061}
1062
1063static const struct uart_ops sirfsoc_uart_ops = {
1064 .tx_empty = sirfsoc_uart_tx_empty,
1065 .get_mctrl = sirfsoc_uart_get_mctrl,
1066 .set_mctrl = sirfsoc_uart_set_mctrl,
1067 .stop_tx = sirfsoc_uart_stop_tx,
1068 .start_tx = sirfsoc_uart_start_tx,
1069 .stop_rx = sirfsoc_uart_stop_rx,
1070 .enable_ms = sirfsoc_uart_enable_ms,
1071 .break_ctl = sirfsoc_uart_break_ctl,
1072 .startup = sirfsoc_uart_startup,
1073 .shutdown = sirfsoc_uart_shutdown,
1074 .set_termios = sirfsoc_uart_set_termios,
1075 .pm = sirfsoc_uart_pm,
1076 .type = sirfsoc_uart_type,
1077 .release_port = sirfsoc_uart_release_port,
1078 .request_port = sirfsoc_uart_request_port,
1079 .config_port = sirfsoc_uart_config_port,
1080};
1081
1082#ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE
1083static int __init
1084sirfsoc_uart_console_setup(struct console *co, char *options)
1085{
1086 unsigned int baud = 115200;
1087 unsigned int bits = 8;
1088 unsigned int parity = 'n';
1089 unsigned int flow = 'n';
1090 struct sirfsoc_uart_port *sirfport;
1091 struct sirfsoc_register *ureg;
1092 if (co->index < 0 || co->index >= SIRFSOC_UART_NR)
1093 co->index = 1;
1094 sirfport = sirf_ports[co->index];
1095 if (!sirfport)
1096 return -ENODEV;
1097 ureg = &sirfport->uart_reg->uart_reg;
1098 if (!sirfport->port.mapbase)
1099 return -ENODEV;
1100
1101 /* enable usp in mode1 register */
1102 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
1103 wr_regl(&sirfport->port, ureg->sirfsoc_mode1, SIRFSOC_USP_EN |
1104 SIRFSOC_USP_ENDIAN_CTRL_LSBF);
1105 if (options)
1106 uart_parse_options(options, &baud, &parity, &bits, &flow);
1107 sirfport->port.cons = co;
1108
1109 /* default console tx/rx transfer using io mode */
1110 sirfport->rx_dma_chan = NULL;
1111 sirfport->tx_dma_chan = NULL;
1112 return uart_set_options(&sirfport->port, co, baud, parity, bits, flow);
1113}
1114
1115static void sirfsoc_uart_console_putchar(struct uart_port *port, int ch)
1116{
1117 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1118 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1119 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
1120 while (rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
1121 ufifo_st->ff_full(port))
1122 cpu_relax();
1123 wr_regl(port, ureg->sirfsoc_tx_fifo_data, ch);
1124}
1125
1126static void sirfsoc_uart_console_write(struct console *co, const char *s,
1127 unsigned int count)
1128{
1129 struct sirfsoc_uart_port *sirfport = sirf_ports[co->index];
1130
1131 uart_console_write(&sirfport->port, s, count,
1132 sirfsoc_uart_console_putchar);
1133}
1134
1135static struct console sirfsoc_uart_console = {
1136 .name = SIRFSOC_UART_NAME,
1137 .device = uart_console_device,
1138 .flags = CON_PRINTBUFFER,
1139 .index = -1,
1140 .write = sirfsoc_uart_console_write,
1141 .setup = sirfsoc_uart_console_setup,
1142 .data = &sirfsoc_uart_drv,
1143};
1144
1145static int __init sirfsoc_uart_console_init(void)
1146{
1147 register_console(&sirfsoc_uart_console);
1148 return 0;
1149}
1150console_initcall(sirfsoc_uart_console_init);
1151#endif
1152
1153static struct uart_driver sirfsoc_uart_drv = {
1154 .owner = THIS_MODULE,
1155 .driver_name = SIRFUART_PORT_NAME,
1156 .nr = SIRFSOC_UART_NR,
1157 .dev_name = SIRFSOC_UART_NAME,
1158 .major = SIRFSOC_UART_MAJOR,
1159 .minor = SIRFSOC_UART_MINOR,
1160#ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE
1161 .cons = &sirfsoc_uart_console,
1162#else
1163 .cons = NULL,
1164#endif
1165};
1166
1167static enum hrtimer_restart
1168 sirfsoc_uart_rx_dma_hrtimer_callback(struct hrtimer *hrt)
1169{
1170 struct sirfsoc_uart_port *sirfport;
1171 struct uart_port *port;
1172 int count, inserted;
1173 struct dma_tx_state tx_state;
1174 struct tty_struct *tty;
1175 struct sirfsoc_register *ureg;
1176 struct circ_buf *xmit;
1177 struct sirfsoc_fifo_status *ufifo_st;
1178 int max_pio_cnt;
1179
1180 sirfport = container_of(hrt, struct sirfsoc_uart_port, hrt);
1181 port = &sirfport->port;
1182 inserted = 0;
1183 tty = port->state->port.tty;
1184 ureg = &sirfport->uart_reg->uart_reg;
1185 xmit = &sirfport->rx_dma_items.xmit;
1186 ufifo_st = &sirfport->uart_reg->fifo_status;
1187
1188 dmaengine_tx_status(sirfport->rx_dma_chan,
1189 sirfport->rx_dma_items.cookie, &tx_state);
1190 if (SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue !=
1191 sirfport->rx_last_pos) {
1192 xmit->head = SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue;
1193 sirfport->rx_last_pos = xmit->head;
1194 sirfport->pio_fetch_cnt = 0;
1195 }
1196 count = CIRC_CNT_TO_END(xmit->head, xmit->tail,
1197 SIRFSOC_RX_DMA_BUF_SIZE);
1198 while (count > 0) {
1199 inserted = tty_insert_flip_string(tty->port,
1200 (const unsigned char *)&xmit->buf[xmit->tail], count);
1201 if (!inserted)
1202 goto next_hrt;
1203 port->icount.rx += inserted;
1204 xmit->tail = (xmit->tail + inserted) &
1205 (SIRFSOC_RX_DMA_BUF_SIZE - 1);
1206 count = CIRC_CNT_TO_END(xmit->head, xmit->tail,
1207 SIRFSOC_RX_DMA_BUF_SIZE);
1208 tty_flip_buffer_push(tty->port);
1209 }
1210 /*
1211 * if RX DMA buffer data have all push into tty buffer, and there is
1212 * only little data(less than a dma transfer unit) left in rxfifo,
1213 * fetch it out in pio mode and switch back to dma immediately
1214 */
1215 if (!inserted && !count &&
1216 ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) &
1217 SIRFUART_RX_FIFO_MASK) > sirfport->pio_fetch_cnt)) {
1218 dmaengine_pause(sirfport->rx_dma_chan);
1219 /* switch to pio mode */
1220 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
1221 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
1222 SIRFUART_IO_MODE);
1223 /*
1224 * UART controller SWH_DMA_IO register have CLEAR_RX_ADDR_EN
1225 * When found changing I/O to DMA mode, it clears
1226 * two low bits of read point;
1227 * USP have similar FRADDR_CLR_EN bit in USP_RX_DMA_IO_CTRL.
1228 * Fetch data out from rxfifo into DMA buffer in PIO mode,
1229 * while switch back to DMA mode, the data fetched will override
1230 * by DMA, as hardware have a strange behaviour:
1231 * after switch back to DMA mode, check rxfifo status it will
1232 * be the number PIO fetched, so record the fetched data count
1233 * to avoid the repeated fetch
1234 */
1235 max_pio_cnt = 3;
1236 while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) &
1237 ufifo_st->ff_empty(port)) && max_pio_cnt--) {
1238 xmit->buf[xmit->head] =
1239 rd_regl(port, ureg->sirfsoc_rx_fifo_data);
1240 xmit->head = (xmit->head + 1) &
1241 (SIRFSOC_RX_DMA_BUF_SIZE - 1);
1242 sirfport->pio_fetch_cnt++;
1243 }
1244 /* switch back to dma mode */
1245 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
1246 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
1247 ~SIRFUART_IO_MODE);
1248 dmaengine_resume(sirfport->rx_dma_chan);
1249 }
1250next_hrt:
1251 hrtimer_forward_now(hrt, ns_to_ktime(sirfport->rx_period_time));
1252 return HRTIMER_RESTART;
1253}
1254
1255static const struct of_device_id sirfsoc_uart_ids[] = {
1256 { .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,},
1257 { .compatible = "sirf,atlas7-uart", .data = &sirfsoc_uart},
1258 { .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp},
1259 { .compatible = "sirf,atlas7-usp-uart", .data = &sirfsoc_usp},
1260 {}
1261};
1262MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids);
1263
1264static int sirfsoc_uart_probe(struct platform_device *pdev)
1265{
1266 struct device_node *np = pdev->dev.of_node;
1267 struct sirfsoc_uart_port *sirfport;
1268 struct uart_port *port;
1269 struct resource *res;
1270 int ret;
1271 struct dma_slave_config slv_cfg = {
1272 .src_maxburst = 1,
1273 };
1274 struct dma_slave_config tx_slv_cfg = {
1275 .dst_maxburst = 2,
1276 };
1277 const struct of_device_id *match;
1278
1279 match = of_match_node(sirfsoc_uart_ids, np);
1280 sirfport = devm_kzalloc(&pdev->dev, sizeof(*sirfport), GFP_KERNEL);
1281 if (!sirfport) {
1282 ret = -ENOMEM;
1283 goto err;
1284 }
1285 sirfport->port.line = of_alias_get_id(np, "serial");
1286 if (sirfport->port.line >= ARRAY_SIZE(sirf_ports)) {
1287 dev_err(&pdev->dev, "serial%d out of range\n",
1288 sirfport->port.line);
1289 return -EINVAL;
1290 }
1291 sirf_ports[sirfport->port.line] = sirfport;
1292 sirfport->port.iotype = UPIO_MEM;
1293 sirfport->port.flags = UPF_BOOT_AUTOCONF;
1294 port = &sirfport->port;
1295 port->dev = &pdev->dev;
1296 port->private_data = sirfport;
1297 sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data;
1298
1299 sirfport->hw_flow_ctrl =
1300 of_property_read_bool(np, "uart-has-rtscts") ||
1301 of_property_read_bool(np, "sirf,uart-has-rtscts") /* deprecated */;
1302 if (of_device_is_compatible(np, "sirf,prima2-uart") ||
1303 of_device_is_compatible(np, "sirf,atlas7-uart"))
1304 sirfport->uart_reg->uart_type = SIRF_REAL_UART;
1305 if (of_device_is_compatible(np, "sirf,prima2-usp-uart") ||
1306 of_device_is_compatible(np, "sirf,atlas7-usp-uart")) {
1307 sirfport->uart_reg->uart_type = SIRF_USP_UART;
1308 if (!sirfport->hw_flow_ctrl)
1309 goto usp_no_flow_control;
1310 if (of_find_property(np, "cts-gpios", NULL))
1311 sirfport->cts_gpio =
1312 of_get_named_gpio(np, "cts-gpios", 0);
1313 else
1314 sirfport->cts_gpio = -1;
1315 if (of_find_property(np, "rts-gpios", NULL))
1316 sirfport->rts_gpio =
1317 of_get_named_gpio(np, "rts-gpios", 0);
1318 else
1319 sirfport->rts_gpio = -1;
1320
1321 if ((!gpio_is_valid(sirfport->cts_gpio) ||
1322 !gpio_is_valid(sirfport->rts_gpio))) {
1323 ret = -EINVAL;
1324 dev_err(&pdev->dev,
1325 "Usp flow control must have cts and rts gpio");
1326 goto err;
1327 }
1328 ret = devm_gpio_request(&pdev->dev, sirfport->cts_gpio,
1329 "usp-cts-gpio");
1330 if (ret) {
1331 dev_err(&pdev->dev, "Unable request cts gpio");
1332 goto err;
1333 }
1334 gpio_direction_input(sirfport->cts_gpio);
1335 ret = devm_gpio_request(&pdev->dev, sirfport->rts_gpio,
1336 "usp-rts-gpio");
1337 if (ret) {
1338 dev_err(&pdev->dev, "Unable request rts gpio");
1339 goto err;
1340 }
1341 gpio_direction_output(sirfport->rts_gpio, 1);
1342 }
1343usp_no_flow_control:
1344 if (of_device_is_compatible(np, "sirf,atlas7-uart") ||
1345 of_device_is_compatible(np, "sirf,atlas7-usp-uart"))
1346 sirfport->is_atlas7 = true;
1347
1348 if (of_property_read_u32(np, "fifosize", &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 port->mapbase = res->start;
1362 port->membase = devm_ioremap(&pdev->dev,
1363 res->start, resource_size(res));
1364 if (!port->membase) {
1365 dev_err(&pdev->dev, "Cannot remap resource.\n");
1366 ret = -ENOMEM;
1367 goto err;
1368 }
1369 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1370 if (res == NULL) {
1371 dev_err(&pdev->dev, "Insufficient resources.\n");
1372 ret = -EFAULT;
1373 goto err;
1374 }
1375 port->irq = res->start;
1376
1377 sirfport->clk = devm_clk_get(&pdev->dev, NULL);
1378 if (IS_ERR(sirfport->clk)) {
1379 ret = PTR_ERR(sirfport->clk);
1380 goto err;
1381 }
1382 port->uartclk = clk_get_rate(sirfport->clk);
1383
1384 port->ops = &sirfsoc_uart_ops;
1385 spin_lock_init(&port->lock);
1386
1387 platform_set_drvdata(pdev, sirfport);
1388 ret = uart_add_one_port(&sirfsoc_uart_drv, port);
1389 if (ret != 0) {
1390 dev_err(&pdev->dev, "Cannot add UART port(%d).\n", pdev->id);
1391 goto err;
1392 }
1393
1394 sirfport->rx_dma_chan = dma_request_slave_channel(port->dev, "rx");
1395 sirfport->rx_dma_items.xmit.buf =
1396 dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1397 &sirfport->rx_dma_items.dma_addr, GFP_KERNEL);
1398 if (!sirfport->rx_dma_items.xmit.buf) {
1399 dev_err(port->dev, "Uart alloc bufa failed\n");
1400 ret = -ENOMEM;
1401 goto alloc_coherent_err;
1402 }
1403 sirfport->rx_dma_items.xmit.head =
1404 sirfport->rx_dma_items.xmit.tail = 0;
1405 if (sirfport->rx_dma_chan)
1406 dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg);
1407 sirfport->tx_dma_chan = dma_request_slave_channel(port->dev, "tx");
1408 if (sirfport->tx_dma_chan)
1409 dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg);
1410 if (sirfport->rx_dma_chan) {
1411 hrtimer_init(&sirfport->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1412 sirfport->hrt.function = sirfsoc_uart_rx_dma_hrtimer_callback;
1413 sirfport->is_hrt_enabled = false;
1414 }
1415
1416 return 0;
1417alloc_coherent_err:
1418 dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1419 sirfport->rx_dma_items.xmit.buf,
1420 sirfport->rx_dma_items.dma_addr);
1421 dma_release_channel(sirfport->rx_dma_chan);
1422err:
1423 return ret;
1424}
1425
1426static int sirfsoc_uart_remove(struct platform_device *pdev)
1427{
1428 struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev);
1429 struct uart_port *port = &sirfport->port;
1430 uart_remove_one_port(&sirfsoc_uart_drv, port);
1431 if (sirfport->rx_dma_chan) {
1432 dmaengine_terminate_all(sirfport->rx_dma_chan);
1433 dma_release_channel(sirfport->rx_dma_chan);
1434 dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1435 sirfport->rx_dma_items.xmit.buf,
1436 sirfport->rx_dma_items.dma_addr);
1437 }
1438 if (sirfport->tx_dma_chan) {
1439 dmaengine_terminate_all(sirfport->tx_dma_chan);
1440 dma_release_channel(sirfport->tx_dma_chan);
1441 }
1442 return 0;
1443}
1444
1445#ifdef CONFIG_PM_SLEEP
1446static int
1447sirfsoc_uart_suspend(struct device *pdev)
1448{
1449 struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev);
1450 struct uart_port *port = &sirfport->port;
1451 uart_suspend_port(&sirfsoc_uart_drv, port);
1452 return 0;
1453}
1454
1455static int sirfsoc_uart_resume(struct device *pdev)
1456{
1457 struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev);
1458 struct uart_port *port = &sirfport->port;
1459 uart_resume_port(&sirfsoc_uart_drv, port);
1460 return 0;
1461}
1462#endif
1463
1464static const struct dev_pm_ops sirfsoc_uart_pm_ops = {
1465 SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_uart_suspend, sirfsoc_uart_resume)
1466};
1467
1468static struct platform_driver sirfsoc_uart_driver = {
1469 .probe = sirfsoc_uart_probe,
1470 .remove = sirfsoc_uart_remove,
1471 .driver = {
1472 .name = SIRFUART_PORT_NAME,
1473 .of_match_table = sirfsoc_uart_ids,
1474 .pm = &sirfsoc_uart_pm_ops,
1475 },
1476};
1477
1478static int __init sirfsoc_uart_init(void)
1479{
1480 int ret = 0;
1481
1482 ret = uart_register_driver(&sirfsoc_uart_drv);
1483 if (ret)
1484 goto out;
1485
1486 ret = platform_driver_register(&sirfsoc_uart_driver);
1487 if (ret)
1488 uart_unregister_driver(&sirfsoc_uart_drv);
1489out:
1490 return ret;
1491}
1492module_init(sirfsoc_uart_init);
1493
1494static void __exit sirfsoc_uart_exit(void)
1495{
1496 platform_driver_unregister(&sirfsoc_uart_driver);
1497 uart_unregister_driver(&sirfsoc_uart_drv);
1498}
1499module_exit(sirfsoc_uart_exit);
1500
1501MODULE_LICENSE("GPL v2");
1502MODULE_AUTHOR("Bin Shi <Bin.Shi@csr.com>, Rong Wang<Rong.Wang@csr.com>");
1503MODULE_DESCRIPTION("CSR SiRFprimaII Uart Driver");
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
32static unsigned int
33sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count);
34static unsigned int
35sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count);
36static struct uart_driver sirfsoc_uart_drv;
37
38static void sirfsoc_uart_tx_dma_complete_callback(void *param);
39static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port);
40static void sirfsoc_uart_rx_dma_complete_callback(void *param);
41static 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
62static 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
107static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port)
108{
109 return container_of(port, struct sirfsoc_uart_port, port);
110}
111
112static 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
123static 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 }
141cts_deasserted:
142 return TIOCM_CAR | TIOCM_DSR;
143cts_asserted:
144 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
145}
146
147static 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
169static 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
199static 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
285static 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
305static 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
334static 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
357static 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 if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled)
362 uart_handle_cts_change(port,
363 !gpio_get_value(sirfport->cts_gpio));
364 return IRQ_HANDLED;
365}
366
367static void sirfsoc_uart_enable_ms(struct uart_port *port)
368{
369 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
370 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
371 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
372
373 if (!sirfport->hw_flow_ctrl)
374 return;
375 sirfport->ms_enabled = true;
376 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
377 wr_regl(port, ureg->sirfsoc_afc_ctrl,
378 rd_regl(port, ureg->sirfsoc_afc_ctrl) |
379 SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN);
380 if (!sirfport->is_marco)
381 wr_regl(port, ureg->sirfsoc_int_en_reg,
382 rd_regl(port, ureg->sirfsoc_int_en_reg)
383 | uint_en->sirfsoc_cts_en);
384 else
385 wr_regl(port, ureg->sirfsoc_int_en_reg,
386 uint_en->sirfsoc_cts_en);
387 } else
388 enable_irq(gpio_to_irq(sirfport->cts_gpio));
389}
390
391static void sirfsoc_uart_break_ctl(struct uart_port *port, int break_state)
392{
393 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
394 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
395 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
396 unsigned long ulcon = rd_regl(port, ureg->sirfsoc_line_ctrl);
397 if (break_state)
398 ulcon |= SIRFUART_SET_BREAK;
399 else
400 ulcon &= ~SIRFUART_SET_BREAK;
401 wr_regl(port, ureg->sirfsoc_line_ctrl, ulcon);
402 }
403}
404
405static unsigned int
406sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
407{
408 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
409 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
410 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
411 unsigned int ch, rx_count = 0;
412 struct tty_struct *tty;
413 tty = tty_port_tty_get(&port->state->port);
414 if (!tty)
415 return -ENODEV;
416 while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) &
417 ufifo_st->ff_empty(port->line))) {
418 ch = rd_regl(port, ureg->sirfsoc_rx_fifo_data) |
419 SIRFUART_DUMMY_READ;
420 if (unlikely(uart_handle_sysrq_char(port, ch)))
421 continue;
422 uart_insert_char(port, 0, 0, ch, TTY_NORMAL);
423 rx_count++;
424 if (rx_count >= max_rx_count)
425 break;
426 }
427
428 sirfport->rx_io_count += rx_count;
429 port->icount.rx += rx_count;
430
431 spin_unlock(&port->lock);
432 tty_flip_buffer_push(&port->state->port);
433 spin_lock(&port->lock);
434
435 return rx_count;
436}
437
438static unsigned int
439sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count)
440{
441 struct uart_port *port = &sirfport->port;
442 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
443 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
444 struct circ_buf *xmit = &port->state->xmit;
445 unsigned int num_tx = 0;
446 while (!uart_circ_empty(xmit) &&
447 !(rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
448 ufifo_st->ff_full(port->line)) &&
449 count--) {
450 wr_regl(port, ureg->sirfsoc_tx_fifo_data,
451 xmit->buf[xmit->tail]);
452 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
453 port->icount.tx++;
454 num_tx++;
455 }
456 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
457 uart_write_wakeup(port);
458 return num_tx;
459}
460
461static void sirfsoc_uart_tx_dma_complete_callback(void *param)
462{
463 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
464 struct uart_port *port = &sirfport->port;
465 struct circ_buf *xmit = &port->state->xmit;
466 unsigned long flags;
467
468 xmit->tail = (xmit->tail + sirfport->transfer_size) &
469 (UART_XMIT_SIZE - 1);
470 port->icount.tx += sirfport->transfer_size;
471 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
472 uart_write_wakeup(port);
473 if (sirfport->tx_dma_addr)
474 dma_unmap_single(port->dev, sirfport->tx_dma_addr,
475 sirfport->transfer_size, DMA_TO_DEVICE);
476 spin_lock_irqsave(&sirfport->tx_lock, flags);
477 sirfport->tx_dma_state = TX_DMA_IDLE;
478 sirfsoc_uart_tx_with_dma(sirfport);
479 spin_unlock_irqrestore(&sirfport->tx_lock, flags);
480}
481
482static void sirfsoc_uart_insert_rx_buf_to_tty(
483 struct sirfsoc_uart_port *sirfport, int count)
484{
485 struct uart_port *port = &sirfport->port;
486 struct tty_port *tport = &port->state->port;
487 int inserted;
488
489 inserted = tty_insert_flip_string(tport,
490 sirfport->rx_dma_items[sirfport->rx_completed].xmit.buf, count);
491 port->icount.rx += inserted;
492 tty_flip_buffer_push(tport);
493}
494
495static void sirfsoc_rx_submit_one_dma_desc(struct uart_port *port, int index)
496{
497 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
498
499 sirfport->rx_dma_items[index].xmit.tail =
500 sirfport->rx_dma_items[index].xmit.head = 0;
501 sirfport->rx_dma_items[index].desc =
502 dmaengine_prep_slave_single(sirfport->rx_dma_chan,
503 sirfport->rx_dma_items[index].dma_addr, SIRFSOC_RX_DMA_BUF_SIZE,
504 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
505 if (!sirfport->rx_dma_items[index].desc) {
506 dev_err(port->dev, "DMA slave single fail\n");
507 return;
508 }
509 sirfport->rx_dma_items[index].desc->callback =
510 sirfsoc_uart_rx_dma_complete_callback;
511 sirfport->rx_dma_items[index].desc->callback_param = sirfport;
512 sirfport->rx_dma_items[index].cookie =
513 dmaengine_submit(sirfport->rx_dma_items[index].desc);
514 dma_async_issue_pending(sirfport->rx_dma_chan);
515}
516
517static void sirfsoc_rx_tmo_process_tl(unsigned long param)
518{
519 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
520 struct uart_port *port = &sirfport->port;
521 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
522 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
523 struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
524 unsigned int count;
525 unsigned long flags;
526 struct dma_tx_state tx_state;
527
528 spin_lock_irqsave(&sirfport->rx_lock, flags);
529 while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
530 sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
531 sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
532 SIRFSOC_RX_DMA_BUF_SIZE);
533 sirfport->rx_completed++;
534 sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
535 }
536 count = CIRC_CNT(sirfport->rx_dma_items[sirfport->rx_issued].xmit.head,
537 sirfport->rx_dma_items[sirfport->rx_issued].xmit.tail,
538 SIRFSOC_RX_DMA_BUF_SIZE);
539 if (count > 0)
540 sirfsoc_uart_insert_rx_buf_to_tty(sirfport, count);
541 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
542 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
543 SIRFUART_IO_MODE);
544 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
545 spin_lock(&port->lock);
546 sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
547 spin_unlock(&port->lock);
548 if (sirfport->rx_io_count == 4) {
549 spin_lock_irqsave(&sirfport->rx_lock, flags);
550 sirfport->rx_io_count = 0;
551 wr_regl(port, ureg->sirfsoc_int_st_reg,
552 uint_st->sirfsoc_rx_done);
553 if (!sirfport->is_marco)
554 wr_regl(port, ureg->sirfsoc_int_en_reg,
555 rd_regl(port, ureg->sirfsoc_int_en_reg) &
556 ~(uint_en->sirfsoc_rx_done_en));
557 else
558 wr_regl(port, SIRFUART_INT_EN_CLR,
559 uint_en->sirfsoc_rx_done_en);
560 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
561
562 sirfsoc_uart_start_next_rx_dma(port);
563 } else {
564 spin_lock_irqsave(&sirfport->rx_lock, flags);
565 wr_regl(port, ureg->sirfsoc_int_st_reg,
566 uint_st->sirfsoc_rx_done);
567 if (!sirfport->is_marco)
568 wr_regl(port, ureg->sirfsoc_int_en_reg,
569 rd_regl(port, ureg->sirfsoc_int_en_reg) |
570 (uint_en->sirfsoc_rx_done_en));
571 else
572 wr_regl(port, ureg->sirfsoc_int_en_reg,
573 uint_en->sirfsoc_rx_done_en);
574 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
575 }
576}
577
578static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
579{
580 struct uart_port *port = &sirfport->port;
581 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
582 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
583 struct dma_tx_state tx_state;
584 spin_lock(&sirfport->rx_lock);
585
586 dmaengine_tx_status(sirfport->rx_dma_chan,
587 sirfport->rx_dma_items[sirfport->rx_issued].cookie, &tx_state);
588 dmaengine_terminate_all(sirfport->rx_dma_chan);
589 sirfport->rx_dma_items[sirfport->rx_issued].xmit.head =
590 SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue;
591 if (!sirfport->is_marco)
592 wr_regl(port, ureg->sirfsoc_int_en_reg,
593 rd_regl(port, ureg->sirfsoc_int_en_reg) &
594 ~(uint_en->sirfsoc_rx_timeout_en));
595 else
596 wr_regl(port, SIRFUART_INT_EN_CLR,
597 uint_en->sirfsoc_rx_timeout_en);
598 spin_unlock(&sirfport->rx_lock);
599 tasklet_schedule(&sirfport->rx_tmo_process_tasklet);
600}
601
602static void sirfsoc_uart_handle_rx_done(struct sirfsoc_uart_port *sirfport)
603{
604 struct uart_port *port = &sirfport->port;
605 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
606 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
607 struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
608
609 sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
610 if (sirfport->rx_io_count == 4) {
611 sirfport->rx_io_count = 0;
612 if (!sirfport->is_marco)
613 wr_regl(port, ureg->sirfsoc_int_en_reg,
614 rd_regl(port, ureg->sirfsoc_int_en_reg) &
615 ~(uint_en->sirfsoc_rx_done_en));
616 else
617 wr_regl(port, SIRFUART_INT_EN_CLR,
618 uint_en->sirfsoc_rx_done_en);
619 wr_regl(port, ureg->sirfsoc_int_st_reg,
620 uint_st->sirfsoc_rx_timeout);
621 sirfsoc_uart_start_next_rx_dma(port);
622 }
623}
624
625static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
626{
627 unsigned long intr_status;
628 unsigned long cts_status;
629 unsigned long flag = TTY_NORMAL;
630 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
631 struct uart_port *port = &sirfport->port;
632 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
633 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
634 struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st;
635 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
636 struct uart_state *state = port->state;
637 struct circ_buf *xmit = &port->state->xmit;
638 spin_lock(&port->lock);
639 intr_status = rd_regl(port, ureg->sirfsoc_int_st_reg);
640 wr_regl(port, ureg->sirfsoc_int_st_reg, intr_status);
641 intr_status &= rd_regl(port, ureg->sirfsoc_int_en_reg);
642 if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT(port, uint_st)))) {
643 if (intr_status & uint_st->sirfsoc_rxd_brk) {
644 port->icount.brk++;
645 if (uart_handle_break(port))
646 goto recv_char;
647 }
648 if (intr_status & uint_st->sirfsoc_rx_oflow)
649 port->icount.overrun++;
650 if (intr_status & uint_st->sirfsoc_frm_err) {
651 port->icount.frame++;
652 flag = TTY_FRAME;
653 }
654 if (intr_status & uint_st->sirfsoc_parity_err)
655 flag = TTY_PARITY;
656 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
657 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
658 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
659 intr_status &= port->read_status_mask;
660 uart_insert_char(port, intr_status,
661 uint_en->sirfsoc_rx_oflow_en, 0, flag);
662 tty_flip_buffer_push(&state->port);
663 }
664recv_char:
665 if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) &&
666 (intr_status & SIRFUART_CTS_INT_ST(uint_st)) &&
667 !sirfport->tx_dma_state) {
668 cts_status = rd_regl(port, ureg->sirfsoc_afc_ctrl) &
669 SIRFUART_AFC_CTS_STATUS;
670 if (cts_status != 0)
671 cts_status = 0;
672 else
673 cts_status = 1;
674 uart_handle_cts_change(port, cts_status);
675 wake_up_interruptible(&state->port.delta_msr_wait);
676 }
677 if (sirfport->rx_dma_chan) {
678 if (intr_status & uint_st->sirfsoc_rx_timeout)
679 sirfsoc_uart_handle_rx_tmo(sirfport);
680 if (intr_status & uint_st->sirfsoc_rx_done)
681 sirfsoc_uart_handle_rx_done(sirfport);
682 } else {
683 if (intr_status & SIRFUART_RX_IO_INT_ST(uint_st))
684 sirfsoc_uart_pio_rx_chars(port,
685 SIRFSOC_UART_IO_RX_MAX_CNT);
686 }
687 if (intr_status & uint_st->sirfsoc_txfifo_empty) {
688 if (sirfport->tx_dma_chan)
689 sirfsoc_uart_tx_with_dma(sirfport);
690 else {
691 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
692 spin_unlock(&port->lock);
693 return IRQ_HANDLED;
694 } else {
695 sirfsoc_uart_pio_tx_chars(sirfport,
696 SIRFSOC_UART_IO_TX_REASONABLE_CNT);
697 if ((uart_circ_empty(xmit)) &&
698 (rd_regl(port, ureg->sirfsoc_tx_fifo_status) &
699 ufifo_st->ff_empty(port->line)))
700 sirfsoc_uart_stop_tx(port);
701 }
702 }
703 }
704 spin_unlock(&port->lock);
705 return IRQ_HANDLED;
706}
707
708static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param)
709{
710 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
711 struct uart_port *port = &sirfport->port;
712 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
713 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
714 unsigned long flags;
715 struct dma_tx_state tx_state;
716 spin_lock_irqsave(&sirfport->rx_lock, flags);
717 while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
718 sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
719 sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
720 SIRFSOC_RX_DMA_BUF_SIZE);
721 if (rd_regl(port, ureg->sirfsoc_int_en_reg) &
722 uint_en->sirfsoc_rx_timeout_en)
723 sirfsoc_rx_submit_one_dma_desc(port,
724 sirfport->rx_completed++);
725 else
726 sirfport->rx_completed++;
727 sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
728 }
729 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
730}
731
732static void sirfsoc_uart_rx_dma_complete_callback(void *param)
733{
734 struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
735 spin_lock(&sirfport->rx_lock);
736 sirfport->rx_issued++;
737 sirfport->rx_issued %= SIRFSOC_RX_LOOP_BUF_CNT;
738 spin_unlock(&sirfport->rx_lock);
739 tasklet_schedule(&sirfport->rx_dma_complete_tasklet);
740}
741
742/* submit rx dma task into dmaengine */
743static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
744{
745 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
746 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
747 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
748 unsigned long flags;
749 int i;
750 spin_lock_irqsave(&sirfport->rx_lock, flags);
751 sirfport->rx_io_count = 0;
752 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
753 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
754 ~SIRFUART_IO_MODE);
755 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
756 for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
757 sirfsoc_rx_submit_one_dma_desc(port, i);
758 sirfport->rx_completed = sirfport->rx_issued = 0;
759 spin_lock_irqsave(&sirfport->rx_lock, flags);
760 if (!sirfport->is_marco)
761 wr_regl(port, ureg->sirfsoc_int_en_reg,
762 rd_regl(port, ureg->sirfsoc_int_en_reg) |
763 SIRFUART_RX_DMA_INT_EN(port, uint_en));
764 else
765 wr_regl(port, ureg->sirfsoc_int_en_reg,
766 SIRFUART_RX_DMA_INT_EN(port, uint_en));
767 spin_unlock_irqrestore(&sirfport->rx_lock, flags);
768}
769
770static void sirfsoc_uart_start_rx(struct uart_port *port)
771{
772 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
773 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
774 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
775
776 sirfport->rx_io_count = 0;
777 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
778 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
779 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
780 if (sirfport->rx_dma_chan)
781 sirfsoc_uart_start_next_rx_dma(port);
782 else {
783 if (!sirfport->is_marco)
784 wr_regl(port, ureg->sirfsoc_int_en_reg,
785 rd_regl(port, ureg->sirfsoc_int_en_reg) |
786 SIRFUART_RX_IO_INT_EN(port, uint_en));
787 else
788 wr_regl(port, ureg->sirfsoc_int_en_reg,
789 SIRFUART_RX_IO_INT_EN(port, uint_en));
790 }
791}
792
793static unsigned int
794sirfsoc_usp_calc_sample_div(unsigned long set_rate,
795 unsigned long ioclk_rate, unsigned long *sample_reg)
796{
797 unsigned long min_delta = ~0UL;
798 unsigned short sample_div;
799 unsigned long ioclk_div = 0;
800 unsigned long temp_delta;
801
802 for (sample_div = SIRF_MIN_SAMPLE_DIV;
803 sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) {
804 temp_delta = ioclk_rate -
805 (ioclk_rate + (set_rate * sample_div) / 2)
806 / (set_rate * sample_div) * set_rate * sample_div;
807
808 temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta;
809 if (temp_delta < min_delta) {
810 ioclk_div = (2 * ioclk_rate /
811 (set_rate * sample_div) + 1) / 2 - 1;
812 if (ioclk_div > SIRF_IOCLK_DIV_MAX)
813 continue;
814 min_delta = temp_delta;
815 *sample_reg = sample_div;
816 if (!temp_delta)
817 break;
818 }
819 }
820 return ioclk_div;
821}
822
823static unsigned int
824sirfsoc_uart_calc_sample_div(unsigned long baud_rate,
825 unsigned long ioclk_rate, unsigned long *set_baud)
826{
827 unsigned long min_delta = ~0UL;
828 unsigned short sample_div;
829 unsigned int regv = 0;
830 unsigned long ioclk_div;
831 unsigned long baud_tmp;
832 int temp_delta;
833
834 for (sample_div = SIRF_MIN_SAMPLE_DIV;
835 sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) {
836 ioclk_div = (ioclk_rate / (baud_rate * (sample_div + 1))) - 1;
837 if (ioclk_div > SIRF_IOCLK_DIV_MAX)
838 continue;
839 baud_tmp = ioclk_rate / ((ioclk_div + 1) * (sample_div + 1));
840 temp_delta = baud_tmp - baud_rate;
841 temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta;
842 if (temp_delta < min_delta) {
843 regv = regv & (~SIRF_IOCLK_DIV_MASK);
844 regv = regv | ioclk_div;
845 regv = regv & (~SIRF_SAMPLE_DIV_MASK);
846 regv = regv | (sample_div << SIRF_SAMPLE_DIV_SHIFT);
847 min_delta = temp_delta;
848 *set_baud = baud_tmp;
849 }
850 }
851 return regv;
852}
853
854static void sirfsoc_uart_set_termios(struct uart_port *port,
855 struct ktermios *termios,
856 struct ktermios *old)
857{
858 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
859 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
860 struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
861 unsigned long config_reg = 0;
862 unsigned long baud_rate;
863 unsigned long set_baud;
864 unsigned long flags;
865 unsigned long ic;
866 unsigned int clk_div_reg = 0;
867 unsigned long txfifo_op_reg, ioclk_rate;
868 unsigned long rx_time_out;
869 int threshold_div;
870 u32 data_bit_len, stop_bit_len, len_val;
871 unsigned long sample_div_reg = 0xf;
872 ioclk_rate = port->uartclk;
873
874 switch (termios->c_cflag & CSIZE) {
875 default:
876 case CS8:
877 data_bit_len = 8;
878 config_reg |= SIRFUART_DATA_BIT_LEN_8;
879 break;
880 case CS7:
881 data_bit_len = 7;
882 config_reg |= SIRFUART_DATA_BIT_LEN_7;
883 break;
884 case CS6:
885 data_bit_len = 6;
886 config_reg |= SIRFUART_DATA_BIT_LEN_6;
887 break;
888 case CS5:
889 data_bit_len = 5;
890 config_reg |= SIRFUART_DATA_BIT_LEN_5;
891 break;
892 }
893 if (termios->c_cflag & CSTOPB) {
894 config_reg |= SIRFUART_STOP_BIT_LEN_2;
895 stop_bit_len = 2;
896 } else
897 stop_bit_len = 1;
898
899 spin_lock_irqsave(&port->lock, flags);
900 port->read_status_mask = uint_en->sirfsoc_rx_oflow_en;
901 port->ignore_status_mask = 0;
902 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
903 if (termios->c_iflag & INPCK)
904 port->read_status_mask |= uint_en->sirfsoc_frm_err_en |
905 uint_en->sirfsoc_parity_err_en;
906 } else {
907 if (termios->c_iflag & INPCK)
908 port->read_status_mask |= uint_en->sirfsoc_frm_err_en;
909 }
910 if (termios->c_iflag & (BRKINT | PARMRK))
911 port->read_status_mask |= uint_en->sirfsoc_rxd_brk_en;
912 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
913 if (termios->c_iflag & IGNPAR)
914 port->ignore_status_mask |=
915 uint_en->sirfsoc_frm_err_en |
916 uint_en->sirfsoc_parity_err_en;
917 if (termios->c_cflag & PARENB) {
918 if (termios->c_cflag & CMSPAR) {
919 if (termios->c_cflag & PARODD)
920 config_reg |= SIRFUART_STICK_BIT_MARK;
921 else
922 config_reg |= SIRFUART_STICK_BIT_SPACE;
923 } else if (termios->c_cflag & PARODD) {
924 config_reg |= SIRFUART_STICK_BIT_ODD;
925 } else {
926 config_reg |= SIRFUART_STICK_BIT_EVEN;
927 }
928 }
929 } else {
930 if (termios->c_iflag & IGNPAR)
931 port->ignore_status_mask |=
932 uint_en->sirfsoc_frm_err_en;
933 if (termios->c_cflag & PARENB)
934 dev_warn(port->dev,
935 "USP-UART not support parity err\n");
936 }
937 if (termios->c_iflag & IGNBRK) {
938 port->ignore_status_mask |=
939 uint_en->sirfsoc_rxd_brk_en;
940 if (termios->c_iflag & IGNPAR)
941 port->ignore_status_mask |=
942 uint_en->sirfsoc_rx_oflow_en;
943 }
944 if ((termios->c_cflag & CREAD) == 0)
945 port->ignore_status_mask |= SIRFUART_DUMMY_READ;
946 /* Hardware Flow Control Settings */
947 if (UART_ENABLE_MS(port, termios->c_cflag)) {
948 if (!sirfport->ms_enabled)
949 sirfsoc_uart_enable_ms(port);
950 } else {
951 if (sirfport->ms_enabled)
952 sirfsoc_uart_disable_ms(port);
953 }
954 baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000);
955 if (ioclk_rate == 150000000) {
956 for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++)
957 if (baud_rate == baudrate_to_regv[ic].baud_rate)
958 clk_div_reg = baudrate_to_regv[ic].reg_val;
959 }
960 set_baud = baud_rate;
961 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
962 if (unlikely(clk_div_reg == 0))
963 clk_div_reg = sirfsoc_uart_calc_sample_div(baud_rate,
964 ioclk_rate, &set_baud);
965 wr_regl(port, ureg->sirfsoc_divisor, clk_div_reg);
966 } else {
967 clk_div_reg = sirfsoc_usp_calc_sample_div(baud_rate,
968 ioclk_rate, &sample_div_reg);
969 sample_div_reg--;
970 set_baud = ((ioclk_rate / (clk_div_reg+1) - 1) /
971 (sample_div_reg + 1));
972 /* setting usp mode 2 */
973 len_val = ((1 << SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET) |
974 (1 << SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET));
975 len_val |= ((clk_div_reg & SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK)
976 << SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET);
977 wr_regl(port, ureg->sirfsoc_mode2, len_val);
978 }
979 if (tty_termios_baud_rate(termios))
980 tty_termios_encode_baud_rate(termios, set_baud, set_baud);
981 /* set receive timeout && data bits len */
982 rx_time_out = SIRFSOC_UART_RX_TIMEOUT(set_baud, 20000);
983 rx_time_out = SIRFUART_RECV_TIMEOUT_VALUE(rx_time_out);
984 txfifo_op_reg = rd_regl(port, ureg->sirfsoc_tx_fifo_op);
985 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_STOP);
986 wr_regl(port, ureg->sirfsoc_tx_fifo_op,
987 (txfifo_op_reg & ~SIRFUART_FIFO_START));
988 if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
989 config_reg |= SIRFUART_RECV_TIMEOUT(port, rx_time_out);
990 wr_regl(port, ureg->sirfsoc_line_ctrl, config_reg);
991 } else {
992 /*tx frame ctrl*/
993 len_val = (data_bit_len - 1) << SIRFSOC_USP_TX_DATA_LEN_OFFSET;
994 len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
995 SIRFSOC_USP_TX_FRAME_LEN_OFFSET;
996 len_val |= ((data_bit_len - 1) <<
997 SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET);
998 len_val |= (((clk_div_reg & 0xc00) >> 10) <<
999 SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET);
1000 wr_regl(port, ureg->sirfsoc_tx_frame_ctrl, len_val);
1001 /*rx frame ctrl*/
1002 len_val = (data_bit_len - 1) << SIRFSOC_USP_RX_DATA_LEN_OFFSET;
1003 len_val |= (data_bit_len + 1 + stop_bit_len - 1) <<
1004 SIRFSOC_USP_RX_FRAME_LEN_OFFSET;
1005 len_val |= (data_bit_len - 1) <<
1006 SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET;
1007 len_val |= (((clk_div_reg & 0xf000) >> 12) <<
1008 SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET);
1009 wr_regl(port, ureg->sirfsoc_rx_frame_ctrl, len_val);
1010 /*async param*/
1011 wr_regl(port, ureg->sirfsoc_async_param_reg,
1012 (SIRFUART_RECV_TIMEOUT(port, rx_time_out)) |
1013 (sample_div_reg & SIRFSOC_USP_ASYNC_DIV2_MASK) <<
1014 SIRFSOC_USP_ASYNC_DIV2_OFFSET);
1015 }
1016 if (sirfport->tx_dma_chan)
1017 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_DMA_MODE);
1018 else
1019 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE);
1020 if (sirfport->rx_dma_chan)
1021 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_DMA_MODE);
1022 else
1023 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_IO_MODE);
1024 /* Reset Rx/Tx FIFO Threshold level for proper baudrate */
1025 if (set_baud < 1000000)
1026 threshold_div = 1;
1027 else
1028 threshold_div = 2;
1029 wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl,
1030 SIRFUART_FIFO_THD(port) / threshold_div);
1031 wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl,
1032 SIRFUART_FIFO_THD(port) / threshold_div);
1033 txfifo_op_reg |= SIRFUART_FIFO_START;
1034 wr_regl(port, ureg->sirfsoc_tx_fifo_op, txfifo_op_reg);
1035 uart_update_timeout(port, termios->c_cflag, set_baud);
1036 sirfsoc_uart_start_rx(port);
1037 wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_TX_EN | SIRFUART_RX_EN);
1038 spin_unlock_irqrestore(&port->lock, flags);
1039}
1040
1041static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state,
1042 unsigned int oldstate)
1043{
1044 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1045 if (!state)
1046 clk_prepare_enable(sirfport->clk);
1047 else
1048 clk_disable_unprepare(sirfport->clk);
1049}
1050
1051static int sirfsoc_uart_startup(struct uart_port *port)
1052{
1053 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1054 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1055 unsigned int index = port->line;
1056 int ret;
1057 set_irq_flags(port->irq, IRQF_VALID | IRQF_NOAUTOEN);
1058 ret = request_irq(port->irq,
1059 sirfsoc_uart_isr,
1060 0,
1061 SIRFUART_PORT_NAME,
1062 sirfport);
1063 if (ret != 0) {
1064 dev_err(port->dev, "UART%d request IRQ line (%d) failed.\n",
1065 index, port->irq);
1066 goto irq_err;
1067 }
1068
1069 /* initial hardware settings */
1070 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl,
1071 rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl) |
1072 SIRFUART_IO_MODE);
1073 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
1074 rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
1075 SIRFUART_IO_MODE);
1076 wr_regl(port, ureg->sirfsoc_tx_dma_io_len, 0);
1077 wr_regl(port, ureg->sirfsoc_rx_dma_io_len, 0);
1078 wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_RX_EN | SIRFUART_TX_EN);
1079 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
1080 wr_regl(port, ureg->sirfsoc_mode1,
1081 SIRFSOC_USP_ENDIAN_CTRL_LSBF |
1082 SIRFSOC_USP_EN);
1083 wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_RESET);
1084 wr_regl(port, ureg->sirfsoc_tx_fifo_op, 0);
1085 wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
1086 wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
1087 wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, SIRFUART_FIFO_THD(port));
1088 wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port));
1089 if (sirfport->rx_dma_chan)
1090 wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk,
1091 SIRFUART_RX_FIFO_CHK_SC(port->line, 0x4) |
1092 SIRFUART_RX_FIFO_CHK_LC(port->line, 0xe) |
1093 SIRFUART_RX_FIFO_CHK_HC(port->line, 0x1b));
1094 if (sirfport->tx_dma_chan) {
1095 sirfport->tx_dma_state = TX_DMA_IDLE;
1096 wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk,
1097 SIRFUART_TX_FIFO_CHK_SC(port->line, 0x1b) |
1098 SIRFUART_TX_FIFO_CHK_LC(port->line, 0xe) |
1099 SIRFUART_TX_FIFO_CHK_HC(port->line, 0x4));
1100 }
1101 sirfport->ms_enabled = false;
1102 if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
1103 sirfport->hw_flow_ctrl) {
1104 set_irq_flags(gpio_to_irq(sirfport->cts_gpio),
1105 IRQF_VALID | IRQF_NOAUTOEN);
1106 ret = request_irq(gpio_to_irq(sirfport->cts_gpio),
1107 sirfsoc_uart_usp_cts_handler, IRQF_TRIGGER_FALLING |
1108 IRQF_TRIGGER_RISING, "usp_cts_irq", sirfport);
1109 if (ret != 0) {
1110 dev_err(port->dev, "UART-USP:request gpio irq fail\n");
1111 goto init_rx_err;
1112 }
1113 }
1114
1115 enable_irq(port->irq);
1116
1117 return 0;
1118init_rx_err:
1119 free_irq(port->irq, sirfport);
1120irq_err:
1121 return ret;
1122}
1123
1124static void sirfsoc_uart_shutdown(struct uart_port *port)
1125{
1126 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1127 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1128 if (!sirfport->is_marco)
1129 wr_regl(port, ureg->sirfsoc_int_en_reg, 0);
1130 else
1131 wr_regl(port, SIRFUART_INT_EN_CLR, ~0UL);
1132
1133 free_irq(port->irq, sirfport);
1134 if (sirfport->ms_enabled)
1135 sirfsoc_uart_disable_ms(port);
1136 if (sirfport->uart_reg->uart_type == SIRF_USP_UART &&
1137 sirfport->hw_flow_ctrl) {
1138 gpio_set_value(sirfport->rts_gpio, 1);
1139 free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport);
1140 }
1141 if (sirfport->tx_dma_chan)
1142 sirfport->tx_dma_state = TX_DMA_IDLE;
1143}
1144
1145static const char *sirfsoc_uart_type(struct uart_port *port)
1146{
1147 return port->type == SIRFSOC_PORT_TYPE ? SIRFUART_PORT_NAME : NULL;
1148}
1149
1150static int sirfsoc_uart_request_port(struct uart_port *port)
1151{
1152 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1153 struct sirfsoc_uart_param *uart_param = &sirfport->uart_reg->uart_param;
1154 void *ret;
1155 ret = request_mem_region(port->mapbase,
1156 SIRFUART_MAP_SIZE, uart_param->port_name);
1157 return ret ? 0 : -EBUSY;
1158}
1159
1160static void sirfsoc_uart_release_port(struct uart_port *port)
1161{
1162 release_mem_region(port->mapbase, SIRFUART_MAP_SIZE);
1163}
1164
1165static void sirfsoc_uart_config_port(struct uart_port *port, int flags)
1166{
1167 if (flags & UART_CONFIG_TYPE) {
1168 port->type = SIRFSOC_PORT_TYPE;
1169 sirfsoc_uart_request_port(port);
1170 }
1171}
1172
1173static struct uart_ops sirfsoc_uart_ops = {
1174 .tx_empty = sirfsoc_uart_tx_empty,
1175 .get_mctrl = sirfsoc_uart_get_mctrl,
1176 .set_mctrl = sirfsoc_uart_set_mctrl,
1177 .stop_tx = sirfsoc_uart_stop_tx,
1178 .start_tx = sirfsoc_uart_start_tx,
1179 .stop_rx = sirfsoc_uart_stop_rx,
1180 .enable_ms = sirfsoc_uart_enable_ms,
1181 .break_ctl = sirfsoc_uart_break_ctl,
1182 .startup = sirfsoc_uart_startup,
1183 .shutdown = sirfsoc_uart_shutdown,
1184 .set_termios = sirfsoc_uart_set_termios,
1185 .pm = sirfsoc_uart_pm,
1186 .type = sirfsoc_uart_type,
1187 .release_port = sirfsoc_uart_release_port,
1188 .request_port = sirfsoc_uart_request_port,
1189 .config_port = sirfsoc_uart_config_port,
1190};
1191
1192#ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE
1193static int __init
1194sirfsoc_uart_console_setup(struct console *co, char *options)
1195{
1196 unsigned int baud = 115200;
1197 unsigned int bits = 8;
1198 unsigned int parity = 'n';
1199 unsigned int flow = 'n';
1200 struct uart_port *port = &sirfsoc_uart_ports[co->index].port;
1201 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1202 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1203 if (co->index < 0 || co->index >= SIRFSOC_UART_NR)
1204 return -EINVAL;
1205
1206 if (!port->mapbase)
1207 return -ENODEV;
1208
1209 /* enable usp in mode1 register */
1210 if (sirfport->uart_reg->uart_type == SIRF_USP_UART)
1211 wr_regl(port, ureg->sirfsoc_mode1, SIRFSOC_USP_EN |
1212 SIRFSOC_USP_ENDIAN_CTRL_LSBF);
1213 if (options)
1214 uart_parse_options(options, &baud, &parity, &bits, &flow);
1215 port->cons = co;
1216
1217 /* default console tx/rx transfer using io mode */
1218 sirfport->rx_dma_chan = NULL;
1219 sirfport->tx_dma_chan = NULL;
1220 return uart_set_options(port, co, baud, parity, bits, flow);
1221}
1222
1223static void sirfsoc_uart_console_putchar(struct uart_port *port, int ch)
1224{
1225 struct sirfsoc_uart_port *sirfport = to_sirfport(port);
1226 struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
1227 struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status;
1228 while (rd_regl(port,
1229 ureg->sirfsoc_tx_fifo_status) & ufifo_st->ff_full(port->line))
1230 cpu_relax();
1231 wr_regb(port, ureg->sirfsoc_tx_fifo_data, ch);
1232}
1233
1234static void sirfsoc_uart_console_write(struct console *co, const char *s,
1235 unsigned int count)
1236{
1237 struct uart_port *port = &sirfsoc_uart_ports[co->index].port;
1238 uart_console_write(port, s, count, sirfsoc_uart_console_putchar);
1239}
1240
1241static struct console sirfsoc_uart_console = {
1242 .name = SIRFSOC_UART_NAME,
1243 .device = uart_console_device,
1244 .flags = CON_PRINTBUFFER,
1245 .index = -1,
1246 .write = sirfsoc_uart_console_write,
1247 .setup = sirfsoc_uart_console_setup,
1248 .data = &sirfsoc_uart_drv,
1249};
1250
1251static int __init sirfsoc_uart_console_init(void)
1252{
1253 register_console(&sirfsoc_uart_console);
1254 return 0;
1255}
1256console_initcall(sirfsoc_uart_console_init);
1257#endif
1258
1259static struct uart_driver sirfsoc_uart_drv = {
1260 .owner = THIS_MODULE,
1261 .driver_name = SIRFUART_PORT_NAME,
1262 .nr = SIRFSOC_UART_NR,
1263 .dev_name = SIRFSOC_UART_NAME,
1264 .major = SIRFSOC_UART_MAJOR,
1265 .minor = SIRFSOC_UART_MINOR,
1266#ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE
1267 .cons = &sirfsoc_uart_console,
1268#else
1269 .cons = NULL,
1270#endif
1271};
1272
1273static struct of_device_id sirfsoc_uart_ids[] = {
1274 { .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,},
1275 { .compatible = "sirf,marco-uart", .data = &sirfsoc_uart},
1276 { .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp},
1277 {}
1278};
1279MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids);
1280
1281static int sirfsoc_uart_probe(struct platform_device *pdev)
1282{
1283 struct sirfsoc_uart_port *sirfport;
1284 struct uart_port *port;
1285 struct resource *res;
1286 int ret;
1287 int i, j;
1288 struct dma_slave_config slv_cfg = {
1289 .src_maxburst = 2,
1290 };
1291 struct dma_slave_config tx_slv_cfg = {
1292 .dst_maxburst = 2,
1293 };
1294 const struct of_device_id *match;
1295
1296 match = of_match_node(sirfsoc_uart_ids, pdev->dev.of_node);
1297 if (of_property_read_u32(pdev->dev.of_node, "cell-index", &pdev->id)) {
1298 dev_err(&pdev->dev,
1299 "Unable to find cell-index in uart node.\n");
1300 ret = -EFAULT;
1301 goto err;
1302 }
1303 if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart"))
1304 pdev->id += ((struct sirfsoc_uart_register *)
1305 match->data)->uart_param.register_uart_nr;
1306 sirfport = &sirfsoc_uart_ports[pdev->id];
1307 port = &sirfport->port;
1308 port->dev = &pdev->dev;
1309 port->private_data = sirfport;
1310 sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data;
1311
1312 sirfport->hw_flow_ctrl = of_property_read_bool(pdev->dev.of_node,
1313 "sirf,uart-has-rtscts");
1314 if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart"))
1315 sirfport->uart_reg->uart_type = SIRF_REAL_UART;
1316 if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart")) {
1317 sirfport->uart_reg->uart_type = SIRF_USP_UART;
1318 if (!sirfport->hw_flow_ctrl)
1319 goto usp_no_flow_control;
1320 if (of_find_property(pdev->dev.of_node, "cts-gpios", NULL))
1321 sirfport->cts_gpio = of_get_named_gpio(
1322 pdev->dev.of_node, "cts-gpios", 0);
1323 else
1324 sirfport->cts_gpio = -1;
1325 if (of_find_property(pdev->dev.of_node, "rts-gpios", NULL))
1326 sirfport->rts_gpio = of_get_named_gpio(
1327 pdev->dev.of_node, "rts-gpios", 0);
1328 else
1329 sirfport->rts_gpio = -1;
1330
1331 if ((!gpio_is_valid(sirfport->cts_gpio) ||
1332 !gpio_is_valid(sirfport->rts_gpio))) {
1333 ret = -EINVAL;
1334 dev_err(&pdev->dev,
1335 "Usp flow control must have cts and rts gpio");
1336 goto err;
1337 }
1338 ret = devm_gpio_request(&pdev->dev, sirfport->cts_gpio,
1339 "usp-cts-gpio");
1340 if (ret) {
1341 dev_err(&pdev->dev, "Unable request cts gpio");
1342 goto err;
1343 }
1344 gpio_direction_input(sirfport->cts_gpio);
1345 ret = devm_gpio_request(&pdev->dev, sirfport->rts_gpio,
1346 "usp-rts-gpio");
1347 if (ret) {
1348 dev_err(&pdev->dev, "Unable request rts gpio");
1349 goto err;
1350 }
1351 gpio_direction_output(sirfport->rts_gpio, 1);
1352 }
1353usp_no_flow_control:
1354 if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-uart"))
1355 sirfport->is_marco = true;
1356
1357 if (of_property_read_u32(pdev->dev.of_node,
1358 "fifosize",
1359 &port->fifosize)) {
1360 dev_err(&pdev->dev,
1361 "Unable to find fifosize in uart node.\n");
1362 ret = -EFAULT;
1363 goto err;
1364 }
1365
1366 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1367 if (res == NULL) {
1368 dev_err(&pdev->dev, "Insufficient resources.\n");
1369 ret = -EFAULT;
1370 goto err;
1371 }
1372 spin_lock_init(&sirfport->rx_lock);
1373 spin_lock_init(&sirfport->tx_lock);
1374 tasklet_init(&sirfport->rx_dma_complete_tasklet,
1375 sirfsoc_uart_rx_dma_complete_tl, (unsigned long)sirfport);
1376 tasklet_init(&sirfport->rx_tmo_process_tasklet,
1377 sirfsoc_rx_tmo_process_tl, (unsigned long)sirfport);
1378 port->mapbase = res->start;
1379 port->membase = devm_ioremap(&pdev->dev, res->start, resource_size(res));
1380 if (!port->membase) {
1381 dev_err(&pdev->dev, "Cannot remap resource.\n");
1382 ret = -ENOMEM;
1383 goto err;
1384 }
1385 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1386 if (res == NULL) {
1387 dev_err(&pdev->dev, "Insufficient resources.\n");
1388 ret = -EFAULT;
1389 goto err;
1390 }
1391 port->irq = res->start;
1392
1393 sirfport->clk = clk_get(&pdev->dev, NULL);
1394 if (IS_ERR(sirfport->clk)) {
1395 ret = PTR_ERR(sirfport->clk);
1396 goto err;
1397 }
1398 port->uartclk = clk_get_rate(sirfport->clk);
1399
1400 port->ops = &sirfsoc_uart_ops;
1401 spin_lock_init(&port->lock);
1402
1403 platform_set_drvdata(pdev, sirfport);
1404 ret = uart_add_one_port(&sirfsoc_uart_drv, port);
1405 if (ret != 0) {
1406 dev_err(&pdev->dev, "Cannot add UART port(%d).\n", pdev->id);
1407 goto port_err;
1408 }
1409
1410 sirfport->rx_dma_chan = dma_request_slave_channel(port->dev, "rx");
1411 for (i = 0; sirfport->rx_dma_chan && i < SIRFSOC_RX_LOOP_BUF_CNT; i++) {
1412 sirfport->rx_dma_items[i].xmit.buf =
1413 dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1414 &sirfport->rx_dma_items[i].dma_addr, GFP_KERNEL);
1415 if (!sirfport->rx_dma_items[i].xmit.buf) {
1416 dev_err(port->dev, "Uart alloc bufa failed\n");
1417 ret = -ENOMEM;
1418 goto alloc_coherent_err;
1419 }
1420 sirfport->rx_dma_items[i].xmit.head =
1421 sirfport->rx_dma_items[i].xmit.tail = 0;
1422 }
1423 if (sirfport->rx_dma_chan)
1424 dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg);
1425 sirfport->tx_dma_chan = dma_request_slave_channel(port->dev, "tx");
1426 if (sirfport->tx_dma_chan)
1427 dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg);
1428
1429 return 0;
1430alloc_coherent_err:
1431 for (j = 0; j < i; j++)
1432 dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1433 sirfport->rx_dma_items[j].xmit.buf,
1434 sirfport->rx_dma_items[j].dma_addr);
1435 dma_release_channel(sirfport->rx_dma_chan);
1436port_err:
1437 clk_put(sirfport->clk);
1438err:
1439 return ret;
1440}
1441
1442static int sirfsoc_uart_remove(struct platform_device *pdev)
1443{
1444 struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev);
1445 struct uart_port *port = &sirfport->port;
1446 clk_put(sirfport->clk);
1447 uart_remove_one_port(&sirfsoc_uart_drv, port);
1448 if (sirfport->rx_dma_chan) {
1449 int i;
1450 dmaengine_terminate_all(sirfport->rx_dma_chan);
1451 dma_release_channel(sirfport->rx_dma_chan);
1452 for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
1453 dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
1454 sirfport->rx_dma_items[i].xmit.buf,
1455 sirfport->rx_dma_items[i].dma_addr);
1456 }
1457 if (sirfport->tx_dma_chan) {
1458 dmaengine_terminate_all(sirfport->tx_dma_chan);
1459 dma_release_channel(sirfport->tx_dma_chan);
1460 }
1461 return 0;
1462}
1463
1464#ifdef CONFIG_PM_SLEEP
1465static int
1466sirfsoc_uart_suspend(struct device *pdev)
1467{
1468 struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev);
1469 struct uart_port *port = &sirfport->port;
1470 uart_suspend_port(&sirfsoc_uart_drv, port);
1471 return 0;
1472}
1473
1474static int sirfsoc_uart_resume(struct device *pdev)
1475{
1476 struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev);
1477 struct uart_port *port = &sirfport->port;
1478 uart_resume_port(&sirfsoc_uart_drv, port);
1479 return 0;
1480}
1481#endif
1482
1483static const struct dev_pm_ops sirfsoc_uart_pm_ops = {
1484 SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_uart_suspend, sirfsoc_uart_resume)
1485};
1486
1487static struct platform_driver sirfsoc_uart_driver = {
1488 .probe = sirfsoc_uart_probe,
1489 .remove = sirfsoc_uart_remove,
1490 .driver = {
1491 .name = SIRFUART_PORT_NAME,
1492 .owner = THIS_MODULE,
1493 .of_match_table = sirfsoc_uart_ids,
1494 .pm = &sirfsoc_uart_pm_ops,
1495 },
1496};
1497
1498static int __init sirfsoc_uart_init(void)
1499{
1500 int ret = 0;
1501
1502 ret = uart_register_driver(&sirfsoc_uart_drv);
1503 if (ret)
1504 goto out;
1505
1506 ret = platform_driver_register(&sirfsoc_uart_driver);
1507 if (ret)
1508 uart_unregister_driver(&sirfsoc_uart_drv);
1509out:
1510 return ret;
1511}
1512module_init(sirfsoc_uart_init);
1513
1514static void __exit sirfsoc_uart_exit(void)
1515{
1516 platform_driver_unregister(&sirfsoc_uart_driver);
1517 uart_unregister_driver(&sirfsoc_uart_drv);
1518}
1519module_exit(sirfsoc_uart_exit);
1520
1521MODULE_LICENSE("GPL v2");
1522MODULE_AUTHOR("Bin Shi <Bin.Shi@csr.com>, Rong Wang<Rong.Wang@csr.com>");
1523MODULE_DESCRIPTION("CSR SiRFprimaII Uart Driver");