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47d37d6f SH |
1 | /* |
2 | * Freescale STMP37XX/STMP378X Application UART driver | |
3 | * | |
4 | * Author: dmitry pervushin <dimka@embeddedalley.com> | |
5 | * | |
6 | * Copyright 2008-2010 Freescale Semiconductor, Inc. | |
7 | * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. | |
8 | * | |
9 | * The code contained herein is licensed under the GNU General Public | |
10 | * License. You may obtain a copy of the GNU General Public License | |
11 | * Version 2 or later at the following locations: | |
12 | * | |
13 | * http://www.opensource.org/licenses/gpl-license.html | |
14 | * http://www.gnu.org/copyleft/gpl.html | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
47d37d6f SH |
18 | #include <linux/errno.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/console.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/wait.h> | |
25 | #include <linux/tty.h> | |
26 | #include <linux/tty_driver.h> | |
27 | #include <linux/tty_flip.h> | |
28 | #include <linux/serial.h> | |
29 | #include <linux/serial_core.h> | |
30 | #include <linux/platform_device.h> | |
31 | #include <linux/device.h> | |
32 | #include <linux/clk.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/io.h> | |
2e174c33 | 35 | #include <linux/pinctrl/consumer.h> |
1ea6607d | 36 | #include <linux/of_device.h> |
e8001632 HS |
37 | #include <linux/dma-mapping.h> |
38 | #include <linux/fsl/mxs-dma.h> | |
47d37d6f SH |
39 | |
40 | #include <asm/cacheflush.h> | |
41 | ||
42 | #define MXS_AUART_PORTS 5 | |
43 | ||
44 | #define AUART_CTRL0 0x00000000 | |
45 | #define AUART_CTRL0_SET 0x00000004 | |
46 | #define AUART_CTRL0_CLR 0x00000008 | |
47 | #define AUART_CTRL0_TOG 0x0000000c | |
48 | #define AUART_CTRL1 0x00000010 | |
49 | #define AUART_CTRL1_SET 0x00000014 | |
50 | #define AUART_CTRL1_CLR 0x00000018 | |
51 | #define AUART_CTRL1_TOG 0x0000001c | |
52 | #define AUART_CTRL2 0x00000020 | |
53 | #define AUART_CTRL2_SET 0x00000024 | |
54 | #define AUART_CTRL2_CLR 0x00000028 | |
55 | #define AUART_CTRL2_TOG 0x0000002c | |
56 | #define AUART_LINECTRL 0x00000030 | |
57 | #define AUART_LINECTRL_SET 0x00000034 | |
58 | #define AUART_LINECTRL_CLR 0x00000038 | |
59 | #define AUART_LINECTRL_TOG 0x0000003c | |
60 | #define AUART_LINECTRL2 0x00000040 | |
61 | #define AUART_LINECTRL2_SET 0x00000044 | |
62 | #define AUART_LINECTRL2_CLR 0x00000048 | |
63 | #define AUART_LINECTRL2_TOG 0x0000004c | |
64 | #define AUART_INTR 0x00000050 | |
65 | #define AUART_INTR_SET 0x00000054 | |
66 | #define AUART_INTR_CLR 0x00000058 | |
67 | #define AUART_INTR_TOG 0x0000005c | |
68 | #define AUART_DATA 0x00000060 | |
69 | #define AUART_STAT 0x00000070 | |
70 | #define AUART_DEBUG 0x00000080 | |
71 | #define AUART_VERSION 0x00000090 | |
72 | #define AUART_AUTOBAUD 0x000000a0 | |
73 | ||
74 | #define AUART_CTRL0_SFTRST (1 << 31) | |
75 | #define AUART_CTRL0_CLKGATE (1 << 30) | |
e8001632 HS |
76 | #define AUART_CTRL0_RXTO_ENABLE (1 << 27) |
77 | #define AUART_CTRL0_RXTIMEOUT(v) (((v) & 0x7ff) << 16) | |
78 | #define AUART_CTRL0_XFER_COUNT(v) ((v) & 0xffff) | |
79 | ||
80 | #define AUART_CTRL1_XFER_COUNT(v) ((v) & 0xffff) | |
81 | ||
82 | #define AUART_CTRL2_DMAONERR (1 << 26) | |
83 | #define AUART_CTRL2_TXDMAE (1 << 25) | |
84 | #define AUART_CTRL2_RXDMAE (1 << 24) | |
47d37d6f SH |
85 | |
86 | #define AUART_CTRL2_CTSEN (1 << 15) | |
00592021 | 87 | #define AUART_CTRL2_RTSEN (1 << 14) |
47d37d6f SH |
88 | #define AUART_CTRL2_RTS (1 << 11) |
89 | #define AUART_CTRL2_RXE (1 << 9) | |
90 | #define AUART_CTRL2_TXE (1 << 8) | |
91 | #define AUART_CTRL2_UARTEN (1 << 0) | |
92 | ||
93 | #define AUART_LINECTRL_BAUD_DIVINT_SHIFT 16 | |
94 | #define AUART_LINECTRL_BAUD_DIVINT_MASK 0xffff0000 | |
95 | #define AUART_LINECTRL_BAUD_DIVINT(v) (((v) & 0xffff) << 16) | |
96 | #define AUART_LINECTRL_BAUD_DIVFRAC_SHIFT 8 | |
97 | #define AUART_LINECTRL_BAUD_DIVFRAC_MASK 0x00003f00 | |
98 | #define AUART_LINECTRL_BAUD_DIVFRAC(v) (((v) & 0x3f) << 8) | |
99 | #define AUART_LINECTRL_WLEN_MASK 0x00000060 | |
100 | #define AUART_LINECTRL_WLEN(v) (((v) & 0x3) << 5) | |
101 | #define AUART_LINECTRL_FEN (1 << 4) | |
102 | #define AUART_LINECTRL_STP2 (1 << 3) | |
103 | #define AUART_LINECTRL_EPS (1 << 2) | |
104 | #define AUART_LINECTRL_PEN (1 << 1) | |
105 | #define AUART_LINECTRL_BRK (1 << 0) | |
106 | ||
107 | #define AUART_INTR_RTIEN (1 << 22) | |
108 | #define AUART_INTR_TXIEN (1 << 21) | |
109 | #define AUART_INTR_RXIEN (1 << 20) | |
110 | #define AUART_INTR_CTSMIEN (1 << 17) | |
111 | #define AUART_INTR_RTIS (1 << 6) | |
112 | #define AUART_INTR_TXIS (1 << 5) | |
113 | #define AUART_INTR_RXIS (1 << 4) | |
114 | #define AUART_INTR_CTSMIS (1 << 1) | |
115 | ||
116 | #define AUART_STAT_BUSY (1 << 29) | |
117 | #define AUART_STAT_CTS (1 << 28) | |
118 | #define AUART_STAT_TXFE (1 << 27) | |
119 | #define AUART_STAT_TXFF (1 << 25) | |
120 | #define AUART_STAT_RXFE (1 << 24) | |
121 | #define AUART_STAT_OERR (1 << 19) | |
122 | #define AUART_STAT_BERR (1 << 18) | |
123 | #define AUART_STAT_PERR (1 << 17) | |
124 | #define AUART_STAT_FERR (1 << 16) | |
e8001632 | 125 | #define AUART_STAT_RXCOUNT_MASK 0xffff |
47d37d6f SH |
126 | |
127 | static struct uart_driver auart_driver; | |
128 | ||
f4b1f03b HS |
129 | enum mxs_auart_type { |
130 | IMX23_AUART, | |
131 | IMX28_AUART, | |
132 | }; | |
133 | ||
47d37d6f SH |
134 | struct mxs_auart_port { |
135 | struct uart_port port; | |
136 | ||
e8001632 HS |
137 | #define MXS_AUART_DMA_CONFIG 0x1 |
138 | #define MXS_AUART_DMA_ENABLED 0x2 | |
139 | #define MXS_AUART_DMA_TX_SYNC 2 /* bit 2 */ | |
140 | #define MXS_AUART_DMA_RX_READY 3 /* bit 3 */ | |
141 | unsigned long flags; | |
47d37d6f | 142 | unsigned int ctrl; |
f4b1f03b | 143 | enum mxs_auart_type devtype; |
47d37d6f SH |
144 | |
145 | unsigned int irq; | |
146 | ||
147 | struct clk *clk; | |
148 | struct device *dev; | |
e8001632 HS |
149 | |
150 | /* for DMA */ | |
151 | struct mxs_dma_data dma_data; | |
152 | int dma_channel_rx, dma_channel_tx; | |
153 | int dma_irq_rx, dma_irq_tx; | |
154 | int dma_channel; | |
155 | ||
156 | struct scatterlist tx_sgl; | |
157 | struct dma_chan *tx_dma_chan; | |
158 | void *tx_dma_buf; | |
159 | ||
160 | struct scatterlist rx_sgl; | |
161 | struct dma_chan *rx_dma_chan; | |
162 | void *rx_dma_buf; | |
47d37d6f SH |
163 | }; |
164 | ||
f4b1f03b HS |
165 | static struct platform_device_id mxs_auart_devtype[] = { |
166 | { .name = "mxs-auart-imx23", .driver_data = IMX23_AUART }, | |
167 | { .name = "mxs-auart-imx28", .driver_data = IMX28_AUART }, | |
168 | { /* sentinel */ } | |
169 | }; | |
170 | MODULE_DEVICE_TABLE(platform, mxs_auart_devtype); | |
171 | ||
172 | static struct of_device_id mxs_auart_dt_ids[] = { | |
173 | { | |
174 | .compatible = "fsl,imx28-auart", | |
175 | .data = &mxs_auart_devtype[IMX28_AUART] | |
176 | }, { | |
177 | .compatible = "fsl,imx23-auart", | |
178 | .data = &mxs_auart_devtype[IMX23_AUART] | |
179 | }, { /* sentinel */ } | |
180 | }; | |
181 | MODULE_DEVICE_TABLE(of, mxs_auart_dt_ids); | |
182 | ||
183 | static inline int is_imx28_auart(struct mxs_auart_port *s) | |
184 | { | |
185 | return s->devtype == IMX28_AUART; | |
186 | } | |
187 | ||
e8001632 HS |
188 | static inline bool auart_dma_enabled(struct mxs_auart_port *s) |
189 | { | |
190 | return s->flags & MXS_AUART_DMA_ENABLED; | |
191 | } | |
192 | ||
47d37d6f SH |
193 | static void mxs_auart_stop_tx(struct uart_port *u); |
194 | ||
195 | #define to_auart_port(u) container_of(u, struct mxs_auart_port, port) | |
196 | ||
e8001632 HS |
197 | static void mxs_auart_tx_chars(struct mxs_auart_port *s); |
198 | ||
199 | static void dma_tx_callback(void *param) | |
47d37d6f | 200 | { |
e8001632 | 201 | struct mxs_auart_port *s = param; |
47d37d6f SH |
202 | struct circ_buf *xmit = &s->port.state->xmit; |
203 | ||
e8001632 HS |
204 | dma_unmap_sg(s->dev, &s->tx_sgl, 1, DMA_TO_DEVICE); |
205 | ||
206 | /* clear the bit used to serialize the DMA tx. */ | |
207 | clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags); | |
208 | smp_mb__after_clear_bit(); | |
209 | ||
210 | /* wake up the possible processes. */ | |
211 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
212 | uart_write_wakeup(&s->port); | |
213 | ||
214 | mxs_auart_tx_chars(s); | |
215 | } | |
216 | ||
217 | static int mxs_auart_dma_tx(struct mxs_auart_port *s, int size) | |
218 | { | |
219 | struct dma_async_tx_descriptor *desc; | |
220 | struct scatterlist *sgl = &s->tx_sgl; | |
221 | struct dma_chan *channel = s->tx_dma_chan; | |
222 | u32 pio; | |
223 | ||
224 | /* [1] : send PIO. Note, the first pio word is CTRL1. */ | |
225 | pio = AUART_CTRL1_XFER_COUNT(size); | |
226 | desc = dmaengine_prep_slave_sg(channel, (struct scatterlist *)&pio, | |
227 | 1, DMA_TRANS_NONE, 0); | |
228 | if (!desc) { | |
229 | dev_err(s->dev, "step 1 error\n"); | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | /* [2] : set DMA buffer. */ | |
234 | sg_init_one(sgl, s->tx_dma_buf, size); | |
235 | dma_map_sg(s->dev, sgl, 1, DMA_TO_DEVICE); | |
236 | desc = dmaengine_prep_slave_sg(channel, sgl, | |
237 | 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
238 | if (!desc) { | |
239 | dev_err(s->dev, "step 2 error\n"); | |
240 | return -EINVAL; | |
241 | } | |
242 | ||
243 | /* [3] : submit the DMA */ | |
244 | desc->callback = dma_tx_callback; | |
245 | desc->callback_param = s; | |
246 | dmaengine_submit(desc); | |
247 | dma_async_issue_pending(channel); | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static void mxs_auart_tx_chars(struct mxs_auart_port *s) | |
252 | { | |
253 | struct circ_buf *xmit = &s->port.state->xmit; | |
254 | ||
255 | if (auart_dma_enabled(s)) { | |
256 | int i = 0; | |
257 | int size; | |
258 | void *buffer = s->tx_dma_buf; | |
259 | ||
260 | if (test_and_set_bit(MXS_AUART_DMA_TX_SYNC, &s->flags)) | |
261 | return; | |
262 | ||
263 | while (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) { | |
264 | size = min_t(u32, UART_XMIT_SIZE - i, | |
265 | CIRC_CNT_TO_END(xmit->head, | |
266 | xmit->tail, | |
267 | UART_XMIT_SIZE)); | |
268 | memcpy(buffer + i, xmit->buf + xmit->tail, size); | |
269 | xmit->tail = (xmit->tail + size) & (UART_XMIT_SIZE - 1); | |
270 | ||
271 | i += size; | |
272 | if (i >= UART_XMIT_SIZE) | |
273 | break; | |
274 | } | |
275 | ||
276 | if (uart_tx_stopped(&s->port)) | |
277 | mxs_auart_stop_tx(&s->port); | |
278 | ||
279 | if (i) { | |
280 | mxs_auart_dma_tx(s, i); | |
281 | } else { | |
282 | clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags); | |
283 | smp_mb__after_clear_bit(); | |
284 | } | |
285 | return; | |
286 | } | |
287 | ||
288 | ||
47d37d6f SH |
289 | while (!(readl(s->port.membase + AUART_STAT) & |
290 | AUART_STAT_TXFF)) { | |
291 | if (s->port.x_char) { | |
292 | s->port.icount.tx++; | |
293 | writel(s->port.x_char, | |
294 | s->port.membase + AUART_DATA); | |
295 | s->port.x_char = 0; | |
296 | continue; | |
297 | } | |
298 | if (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) { | |
299 | s->port.icount.tx++; | |
300 | writel(xmit->buf[xmit->tail], | |
301 | s->port.membase + AUART_DATA); | |
302 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
47d37d6f SH |
303 | } else |
304 | break; | |
305 | } | |
d0758a28 UKK |
306 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
307 | uart_write_wakeup(&s->port); | |
308 | ||
47d37d6f SH |
309 | if (uart_circ_empty(&(s->port.state->xmit))) |
310 | writel(AUART_INTR_TXIEN, | |
311 | s->port.membase + AUART_INTR_CLR); | |
312 | else | |
313 | writel(AUART_INTR_TXIEN, | |
314 | s->port.membase + AUART_INTR_SET); | |
315 | ||
316 | if (uart_tx_stopped(&s->port)) | |
317 | mxs_auart_stop_tx(&s->port); | |
318 | } | |
319 | ||
320 | static void mxs_auart_rx_char(struct mxs_auart_port *s) | |
321 | { | |
322 | int flag; | |
323 | u32 stat; | |
324 | u8 c; | |
325 | ||
326 | c = readl(s->port.membase + AUART_DATA); | |
327 | stat = readl(s->port.membase + AUART_STAT); | |
328 | ||
329 | flag = TTY_NORMAL; | |
330 | s->port.icount.rx++; | |
331 | ||
332 | if (stat & AUART_STAT_BERR) { | |
333 | s->port.icount.brk++; | |
334 | if (uart_handle_break(&s->port)) | |
335 | goto out; | |
336 | } else if (stat & AUART_STAT_PERR) { | |
337 | s->port.icount.parity++; | |
338 | } else if (stat & AUART_STAT_FERR) { | |
339 | s->port.icount.frame++; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Mask off conditions which should be ingored. | |
344 | */ | |
345 | stat &= s->port.read_status_mask; | |
346 | ||
347 | if (stat & AUART_STAT_BERR) { | |
348 | flag = TTY_BREAK; | |
349 | } else if (stat & AUART_STAT_PERR) | |
350 | flag = TTY_PARITY; | |
351 | else if (stat & AUART_STAT_FERR) | |
352 | flag = TTY_FRAME; | |
353 | ||
354 | if (stat & AUART_STAT_OERR) | |
355 | s->port.icount.overrun++; | |
356 | ||
357 | if (uart_handle_sysrq_char(&s->port, c)) | |
358 | goto out; | |
359 | ||
360 | uart_insert_char(&s->port, stat, AUART_STAT_OERR, c, flag); | |
361 | out: | |
362 | writel(stat, s->port.membase + AUART_STAT); | |
363 | } | |
364 | ||
365 | static void mxs_auart_rx_chars(struct mxs_auart_port *s) | |
366 | { | |
367 | struct tty_struct *tty = s->port.state->port.tty; | |
368 | u32 stat = 0; | |
369 | ||
370 | for (;;) { | |
371 | stat = readl(s->port.membase + AUART_STAT); | |
372 | if (stat & AUART_STAT_RXFE) | |
373 | break; | |
374 | mxs_auart_rx_char(s); | |
375 | } | |
376 | ||
377 | writel(stat, s->port.membase + AUART_STAT); | |
378 | tty_flip_buffer_push(tty); | |
379 | } | |
380 | ||
381 | static int mxs_auart_request_port(struct uart_port *u) | |
382 | { | |
383 | return 0; | |
384 | } | |
385 | ||
386 | static int mxs_auart_verify_port(struct uart_port *u, | |
387 | struct serial_struct *ser) | |
388 | { | |
389 | if (u->type != PORT_UNKNOWN && u->type != PORT_IMX) | |
390 | return -EINVAL; | |
391 | return 0; | |
392 | } | |
393 | ||
394 | static void mxs_auart_config_port(struct uart_port *u, int flags) | |
395 | { | |
396 | } | |
397 | ||
398 | static const char *mxs_auart_type(struct uart_port *u) | |
399 | { | |
400 | struct mxs_auart_port *s = to_auart_port(u); | |
401 | ||
402 | return dev_name(s->dev); | |
403 | } | |
404 | ||
405 | static void mxs_auart_release_port(struct uart_port *u) | |
406 | { | |
407 | } | |
408 | ||
409 | static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl) | |
410 | { | |
411 | struct mxs_auart_port *s = to_auart_port(u); | |
412 | ||
413 | u32 ctrl = readl(u->membase + AUART_CTRL2); | |
414 | ||
00592021 HS |
415 | ctrl &= ~AUART_CTRL2_RTSEN; |
416 | if (mctrl & TIOCM_RTS) { | |
f21ec3d2 | 417 | if (tty_port_cts_enabled(&u->state->port)) |
00592021 HS |
418 | ctrl |= AUART_CTRL2_RTSEN; |
419 | } | |
420 | ||
47d37d6f SH |
421 | s->ctrl = mctrl; |
422 | writel(ctrl, u->membase + AUART_CTRL2); | |
423 | } | |
424 | ||
425 | static u32 mxs_auart_get_mctrl(struct uart_port *u) | |
426 | { | |
427 | struct mxs_auart_port *s = to_auart_port(u); | |
428 | u32 stat = readl(u->membase + AUART_STAT); | |
429 | int ctrl2 = readl(u->membase + AUART_CTRL2); | |
430 | u32 mctrl = s->ctrl; | |
431 | ||
432 | mctrl &= ~TIOCM_CTS; | |
433 | if (stat & AUART_STAT_CTS) | |
434 | mctrl |= TIOCM_CTS; | |
435 | ||
436 | if (ctrl2 & AUART_CTRL2_RTS) | |
437 | mctrl |= TIOCM_RTS; | |
438 | ||
439 | return mctrl; | |
440 | } | |
441 | ||
e8001632 HS |
442 | static bool mxs_auart_dma_filter(struct dma_chan *chan, void *param) |
443 | { | |
444 | struct mxs_auart_port *s = param; | |
445 | ||
446 | if (!mxs_dma_is_apbx(chan)) | |
447 | return false; | |
448 | ||
449 | if (s->dma_channel == chan->chan_id) { | |
450 | chan->private = &s->dma_data; | |
451 | return true; | |
452 | } | |
453 | return false; | |
454 | } | |
455 | ||
456 | static int mxs_auart_dma_prep_rx(struct mxs_auart_port *s); | |
457 | static void dma_rx_callback(void *arg) | |
458 | { | |
459 | struct mxs_auart_port *s = (struct mxs_auart_port *) arg; | |
460 | struct tty_struct *tty = s->port.state->port.tty; | |
461 | int count; | |
462 | u32 stat; | |
463 | ||
d7ffb932 HS |
464 | dma_unmap_sg(s->dev, &s->rx_sgl, 1, DMA_FROM_DEVICE); |
465 | ||
e8001632 HS |
466 | stat = readl(s->port.membase + AUART_STAT); |
467 | stat &= ~(AUART_STAT_OERR | AUART_STAT_BERR | | |
468 | AUART_STAT_PERR | AUART_STAT_FERR); | |
469 | ||
470 | count = stat & AUART_STAT_RXCOUNT_MASK; | |
471 | tty_insert_flip_string(tty, s->rx_dma_buf, count); | |
472 | ||
473 | writel(stat, s->port.membase + AUART_STAT); | |
474 | tty_flip_buffer_push(tty); | |
475 | ||
476 | /* start the next DMA for RX. */ | |
477 | mxs_auart_dma_prep_rx(s); | |
478 | } | |
479 | ||
480 | static int mxs_auart_dma_prep_rx(struct mxs_auart_port *s) | |
481 | { | |
482 | struct dma_async_tx_descriptor *desc; | |
483 | struct scatterlist *sgl = &s->rx_sgl; | |
484 | struct dma_chan *channel = s->rx_dma_chan; | |
485 | u32 pio[1]; | |
486 | ||
487 | /* [1] : send PIO */ | |
488 | pio[0] = AUART_CTRL0_RXTO_ENABLE | |
489 | | AUART_CTRL0_RXTIMEOUT(0x80) | |
490 | | AUART_CTRL0_XFER_COUNT(UART_XMIT_SIZE); | |
491 | desc = dmaengine_prep_slave_sg(channel, (struct scatterlist *)pio, | |
492 | 1, DMA_TRANS_NONE, 0); | |
493 | if (!desc) { | |
494 | dev_err(s->dev, "step 1 error\n"); | |
495 | return -EINVAL; | |
496 | } | |
497 | ||
498 | /* [2] : send DMA request */ | |
499 | sg_init_one(sgl, s->rx_dma_buf, UART_XMIT_SIZE); | |
500 | dma_map_sg(s->dev, sgl, 1, DMA_FROM_DEVICE); | |
501 | desc = dmaengine_prep_slave_sg(channel, sgl, 1, DMA_DEV_TO_MEM, | |
502 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
503 | if (!desc) { | |
504 | dev_err(s->dev, "step 2 error\n"); | |
505 | return -1; | |
506 | } | |
507 | ||
508 | /* [3] : submit the DMA, but do not issue it. */ | |
509 | desc->callback = dma_rx_callback; | |
510 | desc->callback_param = s; | |
511 | dmaengine_submit(desc); | |
512 | dma_async_issue_pending(channel); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | static void mxs_auart_dma_exit_channel(struct mxs_auart_port *s) | |
517 | { | |
518 | if (s->tx_dma_chan) { | |
519 | dma_release_channel(s->tx_dma_chan); | |
520 | s->tx_dma_chan = NULL; | |
521 | } | |
522 | if (s->rx_dma_chan) { | |
523 | dma_release_channel(s->rx_dma_chan); | |
524 | s->rx_dma_chan = NULL; | |
525 | } | |
526 | ||
527 | kfree(s->tx_dma_buf); | |
528 | kfree(s->rx_dma_buf); | |
529 | s->tx_dma_buf = NULL; | |
530 | s->rx_dma_buf = NULL; | |
531 | } | |
532 | ||
533 | static void mxs_auart_dma_exit(struct mxs_auart_port *s) | |
534 | { | |
535 | ||
536 | writel(AUART_CTRL2_TXDMAE | AUART_CTRL2_RXDMAE | AUART_CTRL2_DMAONERR, | |
537 | s->port.membase + AUART_CTRL2_CLR); | |
538 | ||
539 | mxs_auart_dma_exit_channel(s); | |
540 | s->flags &= ~MXS_AUART_DMA_ENABLED; | |
541 | clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags); | |
542 | clear_bit(MXS_AUART_DMA_RX_READY, &s->flags); | |
543 | } | |
544 | ||
545 | static int mxs_auart_dma_init(struct mxs_auart_port *s) | |
546 | { | |
547 | dma_cap_mask_t mask; | |
548 | ||
549 | if (auart_dma_enabled(s)) | |
550 | return 0; | |
551 | ||
552 | /* We do not get the right DMA channels. */ | |
81a7d777 | 553 | if (s->dma_channel_rx == -1 || s->dma_channel_tx == -1) |
e8001632 HS |
554 | return -EINVAL; |
555 | ||
556 | /* init for RX */ | |
557 | dma_cap_zero(mask); | |
558 | dma_cap_set(DMA_SLAVE, mask); | |
559 | s->dma_channel = s->dma_channel_rx; | |
560 | s->dma_data.chan_irq = s->dma_irq_rx; | |
561 | s->rx_dma_chan = dma_request_channel(mask, mxs_auart_dma_filter, s); | |
562 | if (!s->rx_dma_chan) | |
563 | goto err_out; | |
564 | s->rx_dma_buf = kzalloc(UART_XMIT_SIZE, GFP_KERNEL | GFP_DMA); | |
565 | if (!s->rx_dma_buf) | |
566 | goto err_out; | |
567 | ||
568 | /* init for TX */ | |
569 | s->dma_channel = s->dma_channel_tx; | |
570 | s->dma_data.chan_irq = s->dma_irq_tx; | |
571 | s->tx_dma_chan = dma_request_channel(mask, mxs_auart_dma_filter, s); | |
572 | if (!s->tx_dma_chan) | |
573 | goto err_out; | |
574 | s->tx_dma_buf = kzalloc(UART_XMIT_SIZE, GFP_KERNEL | GFP_DMA); | |
575 | if (!s->tx_dma_buf) | |
576 | goto err_out; | |
577 | ||
578 | /* set the flags */ | |
579 | s->flags |= MXS_AUART_DMA_ENABLED; | |
580 | dev_dbg(s->dev, "enabled the DMA support."); | |
581 | ||
582 | return 0; | |
583 | ||
584 | err_out: | |
585 | mxs_auart_dma_exit_channel(s); | |
586 | return -EINVAL; | |
587 | ||
588 | } | |
589 | ||
47d37d6f SH |
590 | static void mxs_auart_settermios(struct uart_port *u, |
591 | struct ktermios *termios, | |
592 | struct ktermios *old) | |
593 | { | |
e8001632 | 594 | struct mxs_auart_port *s = to_auart_port(u); |
47d37d6f SH |
595 | u32 bm, ctrl, ctrl2, div; |
596 | unsigned int cflag, baud; | |
597 | ||
598 | cflag = termios->c_cflag; | |
599 | ||
600 | ctrl = AUART_LINECTRL_FEN; | |
601 | ctrl2 = readl(u->membase + AUART_CTRL2); | |
602 | ||
603 | /* byte size */ | |
604 | switch (cflag & CSIZE) { | |
605 | case CS5: | |
606 | bm = 0; | |
607 | break; | |
608 | case CS6: | |
609 | bm = 1; | |
610 | break; | |
611 | case CS7: | |
612 | bm = 2; | |
613 | break; | |
614 | case CS8: | |
615 | bm = 3; | |
616 | break; | |
617 | default: | |
618 | return; | |
619 | } | |
620 | ||
621 | ctrl |= AUART_LINECTRL_WLEN(bm); | |
622 | ||
623 | /* parity */ | |
624 | if (cflag & PARENB) { | |
625 | ctrl |= AUART_LINECTRL_PEN; | |
626 | if ((cflag & PARODD) == 0) | |
627 | ctrl |= AUART_LINECTRL_EPS; | |
628 | } | |
629 | ||
630 | u->read_status_mask = 0; | |
631 | ||
632 | if (termios->c_iflag & INPCK) | |
633 | u->read_status_mask |= AUART_STAT_PERR; | |
634 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
635 | u->read_status_mask |= AUART_STAT_BERR; | |
636 | ||
637 | /* | |
638 | * Characters to ignore | |
639 | */ | |
640 | u->ignore_status_mask = 0; | |
641 | if (termios->c_iflag & IGNPAR) | |
642 | u->ignore_status_mask |= AUART_STAT_PERR; | |
643 | if (termios->c_iflag & IGNBRK) { | |
644 | u->ignore_status_mask |= AUART_STAT_BERR; | |
645 | /* | |
646 | * If we're ignoring parity and break indicators, | |
647 | * ignore overruns too (for real raw support). | |
648 | */ | |
649 | if (termios->c_iflag & IGNPAR) | |
650 | u->ignore_status_mask |= AUART_STAT_OERR; | |
651 | } | |
652 | ||
653 | /* | |
654 | * ignore all characters if CREAD is not set | |
655 | */ | |
656 | if (cflag & CREAD) | |
657 | ctrl2 |= AUART_CTRL2_RXE; | |
658 | else | |
659 | ctrl2 &= ~AUART_CTRL2_RXE; | |
660 | ||
661 | /* figure out the stop bits requested */ | |
662 | if (cflag & CSTOPB) | |
663 | ctrl |= AUART_LINECTRL_STP2; | |
664 | ||
665 | /* figure out the hardware flow control settings */ | |
e8001632 HS |
666 | if (cflag & CRTSCTS) { |
667 | /* | |
668 | * The DMA has a bug(see errata:2836) in mx23. | |
669 | * So we can not implement the DMA for auart in mx23, | |
670 | * we can only implement the DMA support for auart | |
671 | * in mx28. | |
672 | */ | |
673 | if (is_imx28_auart(s) && (s->flags & MXS_AUART_DMA_CONFIG)) { | |
674 | if (!mxs_auart_dma_init(s)) | |
675 | /* enable DMA tranfer */ | |
676 | ctrl2 |= AUART_CTRL2_TXDMAE | AUART_CTRL2_RXDMAE | |
677 | | AUART_CTRL2_DMAONERR; | |
678 | } | |
00592021 | 679 | ctrl2 |= AUART_CTRL2_CTSEN | AUART_CTRL2_RTSEN; |
e8001632 | 680 | } else { |
00592021 | 681 | ctrl2 &= ~(AUART_CTRL2_CTSEN | AUART_CTRL2_RTSEN); |
e8001632 | 682 | } |
47d37d6f SH |
683 | |
684 | /* set baud rate */ | |
685 | baud = uart_get_baud_rate(u, termios, old, 0, u->uartclk); | |
686 | div = u->uartclk * 32 / baud; | |
687 | ctrl |= AUART_LINECTRL_BAUD_DIVFRAC(div & 0x3F); | |
688 | ctrl |= AUART_LINECTRL_BAUD_DIVINT(div >> 6); | |
689 | ||
690 | writel(ctrl, u->membase + AUART_LINECTRL); | |
691 | writel(ctrl2, u->membase + AUART_CTRL2); | |
8b979f7c LW |
692 | |
693 | uart_update_timeout(u, termios->c_cflag, baud); | |
e8001632 HS |
694 | |
695 | /* prepare for the DMA RX. */ | |
696 | if (auart_dma_enabled(s) && | |
697 | !test_and_set_bit(MXS_AUART_DMA_RX_READY, &s->flags)) { | |
698 | if (!mxs_auart_dma_prep_rx(s)) { | |
699 | /* Disable the normal RX interrupt. */ | |
a5919442 HS |
700 | writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN, |
701 | u->membase + AUART_INTR_CLR); | |
e8001632 HS |
702 | } else { |
703 | mxs_auart_dma_exit(s); | |
704 | dev_err(s->dev, "We can not start up the DMA.\n"); | |
705 | } | |
706 | } | |
47d37d6f SH |
707 | } |
708 | ||
709 | static irqreturn_t mxs_auart_irq_handle(int irq, void *context) | |
710 | { | |
711 | u32 istatus, istat; | |
712 | struct mxs_auart_port *s = context; | |
713 | u32 stat = readl(s->port.membase + AUART_STAT); | |
714 | ||
715 | istatus = istat = readl(s->port.membase + AUART_INTR); | |
716 | ||
717 | if (istat & AUART_INTR_CTSMIS) { | |
718 | uart_handle_cts_change(&s->port, stat & AUART_STAT_CTS); | |
719 | writel(AUART_INTR_CTSMIS, | |
720 | s->port.membase + AUART_INTR_CLR); | |
721 | istat &= ~AUART_INTR_CTSMIS; | |
722 | } | |
723 | ||
724 | if (istat & (AUART_INTR_RTIS | AUART_INTR_RXIS)) { | |
a5919442 HS |
725 | if (!auart_dma_enabled(s)) |
726 | mxs_auart_rx_chars(s); | |
47d37d6f SH |
727 | istat &= ~(AUART_INTR_RTIS | AUART_INTR_RXIS); |
728 | } | |
729 | ||
730 | if (istat & AUART_INTR_TXIS) { | |
731 | mxs_auart_tx_chars(s); | |
732 | istat &= ~AUART_INTR_TXIS; | |
733 | } | |
734 | ||
735 | writel(istatus & (AUART_INTR_RTIS | |
736 | | AUART_INTR_TXIS | |
737 | | AUART_INTR_RXIS | |
738 | | AUART_INTR_CTSMIS), | |
739 | s->port.membase + AUART_INTR_CLR); | |
740 | ||
741 | return IRQ_HANDLED; | |
742 | } | |
743 | ||
744 | static void mxs_auart_reset(struct uart_port *u) | |
745 | { | |
746 | int i; | |
747 | unsigned int reg; | |
748 | ||
749 | writel(AUART_CTRL0_SFTRST, u->membase + AUART_CTRL0_CLR); | |
750 | ||
751 | for (i = 0; i < 10000; i++) { | |
752 | reg = readl(u->membase + AUART_CTRL0); | |
753 | if (!(reg & AUART_CTRL0_SFTRST)) | |
754 | break; | |
755 | udelay(3); | |
756 | } | |
757 | writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR); | |
758 | } | |
759 | ||
760 | static int mxs_auart_startup(struct uart_port *u) | |
761 | { | |
762 | struct mxs_auart_port *s = to_auart_port(u); | |
763 | ||
a4813770 | 764 | clk_prepare_enable(s->clk); |
47d37d6f SH |
765 | |
766 | writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR); | |
767 | ||
768 | writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_SET); | |
769 | ||
770 | writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN, | |
771 | u->membase + AUART_INTR); | |
772 | ||
773 | /* | |
774 | * Enable fifo so all four bytes of a DMA word are written to | |
775 | * output (otherwise, only the LSB is written, ie. 1 in 4 bytes) | |
776 | */ | |
777 | writel(AUART_LINECTRL_FEN, u->membase + AUART_LINECTRL_SET); | |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | static void mxs_auart_shutdown(struct uart_port *u) | |
783 | { | |
784 | struct mxs_auart_port *s = to_auart_port(u); | |
785 | ||
e8001632 HS |
786 | if (auart_dma_enabled(s)) |
787 | mxs_auart_dma_exit(s); | |
788 | ||
47d37d6f SH |
789 | writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_CLR); |
790 | ||
47d37d6f SH |
791 | writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN, |
792 | u->membase + AUART_INTR_CLR); | |
793 | ||
851b714b HS |
794 | writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_SET); |
795 | ||
a4813770 | 796 | clk_disable_unprepare(s->clk); |
47d37d6f SH |
797 | } |
798 | ||
799 | static unsigned int mxs_auart_tx_empty(struct uart_port *u) | |
800 | { | |
801 | if (readl(u->membase + AUART_STAT) & AUART_STAT_TXFE) | |
802 | return TIOCSER_TEMT; | |
803 | else | |
804 | return 0; | |
805 | } | |
806 | ||
807 | static void mxs_auart_start_tx(struct uart_port *u) | |
808 | { | |
809 | struct mxs_auart_port *s = to_auart_port(u); | |
810 | ||
811 | /* enable transmitter */ | |
812 | writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_SET); | |
813 | ||
814 | mxs_auart_tx_chars(s); | |
815 | } | |
816 | ||
817 | static void mxs_auart_stop_tx(struct uart_port *u) | |
818 | { | |
819 | writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_CLR); | |
820 | } | |
821 | ||
822 | static void mxs_auart_stop_rx(struct uart_port *u) | |
823 | { | |
824 | writel(AUART_CTRL2_RXE, u->membase + AUART_CTRL2_CLR); | |
825 | } | |
826 | ||
827 | static void mxs_auart_break_ctl(struct uart_port *u, int ctl) | |
828 | { | |
829 | if (ctl) | |
830 | writel(AUART_LINECTRL_BRK, | |
831 | u->membase + AUART_LINECTRL_SET); | |
832 | else | |
833 | writel(AUART_LINECTRL_BRK, | |
834 | u->membase + AUART_LINECTRL_CLR); | |
835 | } | |
836 | ||
837 | static void mxs_auart_enable_ms(struct uart_port *port) | |
838 | { | |
839 | /* just empty */ | |
840 | } | |
841 | ||
842 | static struct uart_ops mxs_auart_ops = { | |
843 | .tx_empty = mxs_auart_tx_empty, | |
844 | .start_tx = mxs_auart_start_tx, | |
845 | .stop_tx = mxs_auart_stop_tx, | |
846 | .stop_rx = mxs_auart_stop_rx, | |
847 | .enable_ms = mxs_auart_enable_ms, | |
848 | .break_ctl = mxs_auart_break_ctl, | |
849 | .set_mctrl = mxs_auart_set_mctrl, | |
850 | .get_mctrl = mxs_auart_get_mctrl, | |
851 | .startup = mxs_auart_startup, | |
852 | .shutdown = mxs_auart_shutdown, | |
853 | .set_termios = mxs_auart_settermios, | |
854 | .type = mxs_auart_type, | |
855 | .release_port = mxs_auart_release_port, | |
856 | .request_port = mxs_auart_request_port, | |
857 | .config_port = mxs_auart_config_port, | |
858 | .verify_port = mxs_auart_verify_port, | |
859 | }; | |
860 | ||
861 | static struct mxs_auart_port *auart_port[MXS_AUART_PORTS]; | |
862 | ||
863 | #ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE | |
864 | static void mxs_auart_console_putchar(struct uart_port *port, int ch) | |
865 | { | |
866 | unsigned int to = 1000; | |
867 | ||
868 | while (readl(port->membase + AUART_STAT) & AUART_STAT_TXFF) { | |
869 | if (!to--) | |
870 | break; | |
871 | udelay(1); | |
872 | } | |
873 | ||
874 | writel(ch, port->membase + AUART_DATA); | |
875 | } | |
876 | ||
877 | static void | |
878 | auart_console_write(struct console *co, const char *str, unsigned int count) | |
879 | { | |
880 | struct mxs_auart_port *s; | |
881 | struct uart_port *port; | |
882 | unsigned int old_ctrl0, old_ctrl2; | |
883 | unsigned int to = 1000; | |
884 | ||
885 | if (co->index > MXS_AUART_PORTS || co->index < 0) | |
886 | return; | |
887 | ||
888 | s = auart_port[co->index]; | |
889 | port = &s->port; | |
890 | ||
891 | clk_enable(s->clk); | |
892 | ||
893 | /* First save the CR then disable the interrupts */ | |
894 | old_ctrl2 = readl(port->membase + AUART_CTRL2); | |
895 | old_ctrl0 = readl(port->membase + AUART_CTRL0); | |
896 | ||
897 | writel(AUART_CTRL0_CLKGATE, | |
898 | port->membase + AUART_CTRL0_CLR); | |
899 | writel(AUART_CTRL2_UARTEN | AUART_CTRL2_TXE, | |
900 | port->membase + AUART_CTRL2_SET); | |
901 | ||
902 | uart_console_write(port, str, count, mxs_auart_console_putchar); | |
903 | ||
904 | /* | |
905 | * Finally, wait for transmitter to become empty | |
906 | * and restore the TCR | |
907 | */ | |
908 | while (readl(port->membase + AUART_STAT) & AUART_STAT_BUSY) { | |
909 | if (!to--) | |
910 | break; | |
911 | udelay(1); | |
912 | } | |
913 | ||
914 | writel(old_ctrl0, port->membase + AUART_CTRL0); | |
915 | writel(old_ctrl2, port->membase + AUART_CTRL2); | |
916 | ||
917 | clk_disable(s->clk); | |
918 | } | |
919 | ||
920 | static void __init | |
921 | auart_console_get_options(struct uart_port *port, int *baud, | |
922 | int *parity, int *bits) | |
923 | { | |
924 | unsigned int lcr_h, quot; | |
925 | ||
926 | if (!(readl(port->membase + AUART_CTRL2) & AUART_CTRL2_UARTEN)) | |
927 | return; | |
928 | ||
929 | lcr_h = readl(port->membase + AUART_LINECTRL); | |
930 | ||
931 | *parity = 'n'; | |
932 | if (lcr_h & AUART_LINECTRL_PEN) { | |
933 | if (lcr_h & AUART_LINECTRL_EPS) | |
934 | *parity = 'e'; | |
935 | else | |
936 | *parity = 'o'; | |
937 | } | |
938 | ||
939 | if ((lcr_h & AUART_LINECTRL_WLEN_MASK) == AUART_LINECTRL_WLEN(2)) | |
940 | *bits = 7; | |
941 | else | |
942 | *bits = 8; | |
943 | ||
944 | quot = ((readl(port->membase + AUART_LINECTRL) | |
945 | & AUART_LINECTRL_BAUD_DIVINT_MASK)) | |
946 | >> (AUART_LINECTRL_BAUD_DIVINT_SHIFT - 6); | |
947 | quot |= ((readl(port->membase + AUART_LINECTRL) | |
948 | & AUART_LINECTRL_BAUD_DIVFRAC_MASK)) | |
949 | >> AUART_LINECTRL_BAUD_DIVFRAC_SHIFT; | |
950 | if (quot == 0) | |
951 | quot = 1; | |
952 | ||
953 | *baud = (port->uartclk << 2) / quot; | |
954 | } | |
955 | ||
956 | static int __init | |
957 | auart_console_setup(struct console *co, char *options) | |
958 | { | |
959 | struct mxs_auart_port *s; | |
960 | int baud = 9600; | |
961 | int bits = 8; | |
962 | int parity = 'n'; | |
963 | int flow = 'n'; | |
964 | int ret; | |
965 | ||
966 | /* | |
967 | * Check whether an invalid uart number has been specified, and | |
968 | * if so, search for the first available port that does have | |
969 | * console support. | |
970 | */ | |
971 | if (co->index == -1 || co->index >= ARRAY_SIZE(auart_port)) | |
972 | co->index = 0; | |
973 | s = auart_port[co->index]; | |
974 | if (!s) | |
975 | return -ENODEV; | |
976 | ||
a4813770 | 977 | clk_prepare_enable(s->clk); |
47d37d6f SH |
978 | |
979 | if (options) | |
980 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
981 | else | |
982 | auart_console_get_options(&s->port, &baud, &parity, &bits); | |
983 | ||
984 | ret = uart_set_options(&s->port, co, baud, parity, bits, flow); | |
985 | ||
a4813770 | 986 | clk_disable_unprepare(s->clk); |
47d37d6f SH |
987 | |
988 | return ret; | |
989 | } | |
990 | ||
991 | static struct console auart_console = { | |
992 | .name = "ttyAPP", | |
993 | .write = auart_console_write, | |
994 | .device = uart_console_device, | |
995 | .setup = auart_console_setup, | |
996 | .flags = CON_PRINTBUFFER, | |
997 | .index = -1, | |
998 | .data = &auart_driver, | |
999 | }; | |
1000 | #endif | |
1001 | ||
1002 | static struct uart_driver auart_driver = { | |
1003 | .owner = THIS_MODULE, | |
1004 | .driver_name = "ttyAPP", | |
1005 | .dev_name = "ttyAPP", | |
1006 | .major = 0, | |
1007 | .minor = 0, | |
1008 | .nr = MXS_AUART_PORTS, | |
1009 | #ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE | |
1010 | .cons = &auart_console, | |
1011 | #endif | |
1012 | }; | |
1013 | ||
1ea6607d FE |
1014 | /* |
1015 | * This function returns 1 if pdev isn't a device instatiated by dt, 0 if it | |
1016 | * could successfully get all information from dt or a negative errno. | |
1017 | */ | |
1018 | static int serial_mxs_probe_dt(struct mxs_auart_port *s, | |
1019 | struct platform_device *pdev) | |
1020 | { | |
1021 | struct device_node *np = pdev->dev.of_node; | |
e8001632 | 1022 | u32 dma_channel[2]; |
1ea6607d FE |
1023 | int ret; |
1024 | ||
1025 | if (!np) | |
1026 | /* no device tree device */ | |
1027 | return 1; | |
1028 | ||
1029 | ret = of_alias_get_id(np, "serial"); | |
1030 | if (ret < 0) { | |
1031 | dev_err(&pdev->dev, "failed to get alias id: %d\n", ret); | |
1032 | return ret; | |
1033 | } | |
1034 | s->port.line = ret; | |
1035 | ||
e8001632 HS |
1036 | s->dma_irq_rx = platform_get_irq(pdev, 1); |
1037 | s->dma_irq_tx = platform_get_irq(pdev, 2); | |
1038 | ||
1039 | ret = of_property_read_u32_array(np, "fsl,auart-dma-channel", | |
1040 | dma_channel, 2); | |
1041 | if (ret == 0) { | |
1042 | s->dma_channel_rx = dma_channel[0]; | |
1043 | s->dma_channel_tx = dma_channel[1]; | |
1044 | ||
1045 | s->flags |= MXS_AUART_DMA_CONFIG; | |
1046 | } else { | |
1047 | s->dma_channel_rx = -1; | |
1048 | s->dma_channel_tx = -1; | |
1049 | } | |
1ea6607d FE |
1050 | return 0; |
1051 | } | |
1052 | ||
9671f099 | 1053 | static int mxs_auart_probe(struct platform_device *pdev) |
47d37d6f | 1054 | { |
f4b1f03b HS |
1055 | const struct of_device_id *of_id = |
1056 | of_match_device(mxs_auart_dt_ids, &pdev->dev); | |
47d37d6f SH |
1057 | struct mxs_auart_port *s; |
1058 | u32 version; | |
1059 | int ret = 0; | |
1060 | struct resource *r; | |
2e174c33 | 1061 | struct pinctrl *pinctrl; |
47d37d6f SH |
1062 | |
1063 | s = kzalloc(sizeof(struct mxs_auart_port), GFP_KERNEL); | |
1064 | if (!s) { | |
1065 | ret = -ENOMEM; | |
1066 | goto out; | |
1067 | } | |
1068 | ||
1ea6607d FE |
1069 | ret = serial_mxs_probe_dt(s, pdev); |
1070 | if (ret > 0) | |
1071 | s->port.line = pdev->id < 0 ? 0 : pdev->id; | |
1072 | else if (ret < 0) | |
1073 | goto out_free; | |
1074 | ||
2e174c33 SG |
1075 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
1076 | if (IS_ERR(pinctrl)) { | |
1077 | ret = PTR_ERR(pinctrl); | |
1078 | goto out_free; | |
1079 | } | |
1080 | ||
f4b1f03b HS |
1081 | if (of_id) { |
1082 | pdev->id_entry = of_id->data; | |
1083 | s->devtype = pdev->id_entry->driver_data; | |
1084 | } | |
1085 | ||
47d37d6f SH |
1086 | s->clk = clk_get(&pdev->dev, NULL); |
1087 | if (IS_ERR(s->clk)) { | |
1088 | ret = PTR_ERR(s->clk); | |
1089 | goto out_free; | |
1090 | } | |
1091 | ||
1092 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1093 | if (!r) { | |
1094 | ret = -ENXIO; | |
1095 | goto out_free_clk; | |
1096 | } | |
1097 | ||
1098 | s->port.mapbase = r->start; | |
1099 | s->port.membase = ioremap(r->start, resource_size(r)); | |
1100 | s->port.ops = &mxs_auart_ops; | |
1101 | s->port.iotype = UPIO_MEM; | |
47d37d6f SH |
1102 | s->port.fifosize = 16; |
1103 | s->port.uartclk = clk_get_rate(s->clk); | |
1104 | s->port.type = PORT_IMX; | |
1105 | s->port.dev = s->dev = get_device(&pdev->dev); | |
1106 | ||
47d37d6f SH |
1107 | s->ctrl = 0; |
1108 | ||
1109 | s->irq = platform_get_irq(pdev, 0); | |
1110 | s->port.irq = s->irq; | |
1111 | ret = request_irq(s->irq, mxs_auart_irq_handle, 0, dev_name(&pdev->dev), s); | |
1112 | if (ret) | |
1113 | goto out_free_clk; | |
1114 | ||
1115 | platform_set_drvdata(pdev, s); | |
1116 | ||
1ea6607d | 1117 | auart_port[s->port.line] = s; |
47d37d6f SH |
1118 | |
1119 | mxs_auart_reset(&s->port); | |
1120 | ||
1121 | ret = uart_add_one_port(&auart_driver, &s->port); | |
1122 | if (ret) | |
1123 | goto out_free_irq; | |
1124 | ||
1125 | version = readl(s->port.membase + AUART_VERSION); | |
1126 | dev_info(&pdev->dev, "Found APPUART %d.%d.%d\n", | |
1127 | (version >> 24) & 0xff, | |
1128 | (version >> 16) & 0xff, version & 0xffff); | |
1129 | ||
1130 | return 0; | |
1131 | ||
1132 | out_free_irq: | |
1133 | auart_port[pdev->id] = NULL; | |
1134 | free_irq(s->irq, s); | |
1135 | out_free_clk: | |
23666a74 | 1136 | put_device(s->dev); |
47d37d6f SH |
1137 | clk_put(s->clk); |
1138 | out_free: | |
1139 | kfree(s); | |
1140 | out: | |
1141 | return ret; | |
1142 | } | |
1143 | ||
ae8d8a14 | 1144 | static int mxs_auart_remove(struct platform_device *pdev) |
47d37d6f SH |
1145 | { |
1146 | struct mxs_auart_port *s = platform_get_drvdata(pdev); | |
1147 | ||
1148 | uart_remove_one_port(&auart_driver, &s->port); | |
1149 | ||
1150 | auart_port[pdev->id] = NULL; | |
1151 | ||
b69200fb | 1152 | put_device(s->dev); |
47d37d6f SH |
1153 | clk_put(s->clk); |
1154 | free_irq(s->irq, s); | |
1155 | kfree(s); | |
1156 | ||
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | static struct platform_driver mxs_auart_driver = { | |
1161 | .probe = mxs_auart_probe, | |
2d47b716 | 1162 | .remove = mxs_auart_remove, |
47d37d6f SH |
1163 | .driver = { |
1164 | .name = "mxs-auart", | |
1165 | .owner = THIS_MODULE, | |
1ea6607d | 1166 | .of_match_table = mxs_auart_dt_ids, |
47d37d6f SH |
1167 | }, |
1168 | }; | |
1169 | ||
1170 | static int __init mxs_auart_init(void) | |
1171 | { | |
1172 | int r; | |
1173 | ||
1174 | r = uart_register_driver(&auart_driver); | |
1175 | if (r) | |
1176 | goto out; | |
1177 | ||
1178 | r = platform_driver_register(&mxs_auart_driver); | |
1179 | if (r) | |
1180 | goto out_err; | |
1181 | ||
1182 | return 0; | |
1183 | out_err: | |
1184 | uart_unregister_driver(&auart_driver); | |
1185 | out: | |
1186 | return r; | |
1187 | } | |
1188 | ||
1189 | static void __exit mxs_auart_exit(void) | |
1190 | { | |
1191 | platform_driver_unregister(&mxs_auart_driver); | |
1192 | uart_unregister_driver(&auart_driver); | |
1193 | } | |
1194 | ||
1195 | module_init(mxs_auart_init); | |
1196 | module_exit(mxs_auart_exit); | |
1197 | MODULE_LICENSE("GPL"); | |
1198 | MODULE_DESCRIPTION("Freescale MXS application uart driver"); | |
1ea6607d | 1199 | MODULE_ALIAS("platform:mxs-auart"); |