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rcu: Maintain special bits at bottom of ->dynticks counter
[linux/fpc-iii.git] / drivers / spi / spi-imx.c
blob9a7c62f471dc8cb2e62638d2846989da076442ae
1 /*
2 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2008 Juergen Beisert
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation
17 * 51 Franklin Street, Fifth Floor
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #include <linux/clk.h>
22 #include <linux/completion.h>
23 #include <linux/delay.h>
24 #include <linux/dmaengine.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/err.h>
27 #include <linux/gpio.h>
28 #include <linux/interrupt.h>
29 #include <linux/io.h>
30 #include <linux/irq.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/platform_device.h>
34 #include <linux/slab.h>
35 #include <linux/spi/spi.h>
36 #include <linux/spi/spi_bitbang.h>
37 #include <linux/types.h>
38 #include <linux/of.h>
39 #include <linux/of_device.h>
40 #include <linux/of_gpio.h>
41
42 #include <linux/platform_data/dma-imx.h>
43 #include <linux/platform_data/spi-imx.h>
44
45 #define DRIVER_NAME "spi_imx"
46
47 #define MXC_CSPIRXDATA 0x00
48 #define MXC_CSPITXDATA 0x04
49 #define MXC_CSPICTRL 0x08
50 #define MXC_CSPIINT 0x0c
51 #define MXC_RESET 0x1c
52
53 /* generic defines to abstract from the different register layouts */
54 #define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */
55 #define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */
56
57 /* The maximum bytes that a sdma BD can transfer.*/
58 #define MAX_SDMA_BD_BYTES (1 << 15)
59 struct spi_imx_config {
60 unsigned int speed_hz;
61 unsigned int bpw;
62 };
63
64 enum spi_imx_devtype {
65 IMX1_CSPI,
66 IMX21_CSPI,
67 IMX27_CSPI,
68 IMX31_CSPI,
69 IMX35_CSPI, /* CSPI on all i.mx except above */
70 IMX51_ECSPI, /* ECSPI on i.mx51 and later */
71 };
72
73 struct spi_imx_data;
74
75 struct spi_imx_devtype_data {
76 void (*intctrl)(struct spi_imx_data *, int);
77 int (*config)(struct spi_device *, struct spi_imx_config *);
78 void (*trigger)(struct spi_imx_data *);
79 int (*rx_available)(struct spi_imx_data *);
80 void (*reset)(struct spi_imx_data *);
81 enum spi_imx_devtype devtype;
82 };
83
84 struct spi_imx_data {
85 struct spi_bitbang bitbang;
86 struct device *dev;
87
88 struct completion xfer_done;
89 void __iomem *base;
90 unsigned long base_phys;
91
92 struct clk *clk_per;
93 struct clk *clk_ipg;
94 unsigned long spi_clk;
95 unsigned int spi_bus_clk;
96
97 unsigned int bytes_per_word;
98
99 unsigned int count;
100 void (*tx)(struct spi_imx_data *);
101 void (*rx)(struct spi_imx_data *);
102 void *rx_buf;
103 const void *tx_buf;
104 unsigned int txfifo; /* number of words pushed in tx FIFO */
105
106 /* DMA */
107 bool usedma;
108 u32 wml;
109 struct completion dma_rx_completion;
110 struct completion dma_tx_completion;
111
112 const struct spi_imx_devtype_data *devtype_data;
113 };
114
115 static inline int is_imx27_cspi(struct spi_imx_data *d)
116 {
117 return d->devtype_data->devtype == IMX27_CSPI;
118 }
119
120 static inline int is_imx35_cspi(struct spi_imx_data *d)
121 {
122 return d->devtype_data->devtype == IMX35_CSPI;
123 }
124
125 static inline int is_imx51_ecspi(struct spi_imx_data *d)
126 {
127 return d->devtype_data->devtype == IMX51_ECSPI;
128 }
129
130 static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
131 {
132 return is_imx51_ecspi(d) ? 64 : 8;
133 }
134
135 #define MXC_SPI_BUF_RX(type) \
136 static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
137 { \
138 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
139 \
140 if (spi_imx->rx_buf) { \
141 *(type *)spi_imx->rx_buf = val; \
142 spi_imx->rx_buf += sizeof(type); \
143 } \
144 }
145
146 #define MXC_SPI_BUF_TX(type) \
147 static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
148 { \
149 type val = 0; \
150 \
151 if (spi_imx->tx_buf) { \
152 val = *(type *)spi_imx->tx_buf; \
153 spi_imx->tx_buf += sizeof(type); \
154 } \
155 \
156 spi_imx->count -= sizeof(type); \
157 \
158 writel(val, spi_imx->base + MXC_CSPITXDATA); \
159 }
160
161 MXC_SPI_BUF_RX(u8)
162 MXC_SPI_BUF_TX(u8)
163 MXC_SPI_BUF_RX(u16)
164 MXC_SPI_BUF_TX(u16)
165 MXC_SPI_BUF_RX(u32)
166 MXC_SPI_BUF_TX(u32)
167
168 /* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
169 * (which is currently not the case in this driver)
170 */
171 static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
172 256, 384, 512, 768, 1024};
173
174 /* MX21, MX27 */
175 static unsigned int spi_imx_clkdiv_1(unsigned int fin,
176 unsigned int fspi, unsigned int max, unsigned int *fres)
177 {
178 int i;
179
180 for (i = 2; i < max; i++)
181 if (fspi * mxc_clkdivs[i] >= fin)
182 break;
183
184 *fres = fin / mxc_clkdivs[i];
185 return i;
186 }
187
188 /* MX1, MX31, MX35, MX51 CSPI */
189 static unsigned int spi_imx_clkdiv_2(unsigned int fin,
190 unsigned int fspi, unsigned int *fres)
191 {
192 int i, div = 4;
193
194 for (i = 0; i < 7; i++) {
195 if (fspi * div >= fin)
196 goto out;
197 div <<= 1;
198 }
199
200 out:
201 *fres = fin / div;
202 return i;
203 }
204
205 static int spi_imx_bytes_per_word(const int bpw)
206 {
207 return DIV_ROUND_UP(bpw, BITS_PER_BYTE);
208 }
209
210 static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
211 struct spi_transfer *transfer)
212 {
213 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
214 unsigned int bpw, i;
215
216 if (!master->dma_rx)
217 return false;
218
219 if (!transfer)
220 return false;
221
222 bpw = transfer->bits_per_word;
223 if (!bpw)
224 bpw = spi->bits_per_word;
225
226 bpw = spi_imx_bytes_per_word(bpw);
227
228 if (bpw != 1 && bpw != 2 && bpw != 4)
229 return false;
230
231 for (i = spi_imx_get_fifosize(spi_imx) / 2; i > 0; i--) {
232 if (!(transfer->len % (i * bpw)))
233 break;
234 }
235
236 if (i == 0)
237 return false;
238
239 spi_imx->wml = i;
240
241 return true;
242 }
243
244 #define MX51_ECSPI_CTRL 0x08
245 #define MX51_ECSPI_CTRL_ENABLE (1 << 0)
246 #define MX51_ECSPI_CTRL_XCH (1 << 2)
247 #define MX51_ECSPI_CTRL_SMC (1 << 3)
248 #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
249 #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
250 #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
251 #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
252 #define MX51_ECSPI_CTRL_BL_OFFSET 20
253
254 #define MX51_ECSPI_CONFIG 0x0c
255 #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
256 #define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
257 #define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
258 #define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
259 #define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
260
261 #define MX51_ECSPI_INT 0x10
262 #define MX51_ECSPI_INT_TEEN (1 << 0)
263 #define MX51_ECSPI_INT_RREN (1 << 3)
264
265 #define MX51_ECSPI_DMA 0x14
266 #define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f)
267 #define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16)
268 #define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24)
269
270 #define MX51_ECSPI_DMA_TEDEN (1 << 7)
271 #define MX51_ECSPI_DMA_RXDEN (1 << 23)
272 #define MX51_ECSPI_DMA_RXTDEN (1 << 31)
273
274 #define MX51_ECSPI_STAT 0x18
275 #define MX51_ECSPI_STAT_RR (1 << 3)
276
277 #define MX51_ECSPI_TESTREG 0x20
278 #define MX51_ECSPI_TESTREG_LBC BIT(31)
279
280 /* MX51 eCSPI */
281 static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
282 unsigned int fspi, unsigned int *fres)
283 {
284 /*
285 * there are two 4-bit dividers, the pre-divider divides by
286 * $pre, the post-divider by 2^$post
287 */
288 unsigned int pre, post;
289 unsigned int fin = spi_imx->spi_clk;
290
291 if (unlikely(fspi > fin))
292 return 0;
293
294 post = fls(fin) - fls(fspi);
295 if (fin > fspi << post)
296 post++;
297
298 /* now we have: (fin <= fspi << post) with post being minimal */
299
300 post = max(4U, post) - 4;
301 if (unlikely(post > 0xf)) {
302 dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
303 fspi, fin);
304 return 0xff;
305 }
306
307 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
308
309 dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
310 __func__, fin, fspi, post, pre);
311
312 /* Resulting frequency for the SCLK line. */
313 *fres = (fin / (pre + 1)) >> post;
314
315 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
316 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
317 }
318
319 static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
320 {
321 unsigned val = 0;
322
323 if (enable & MXC_INT_TE)
324 val |= MX51_ECSPI_INT_TEEN;
325
326 if (enable & MXC_INT_RR)
327 val |= MX51_ECSPI_INT_RREN;
328
329 writel(val, spi_imx->base + MX51_ECSPI_INT);
330 }
331
332 static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
333 {
334 u32 reg;
335
336 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
337 reg |= MX51_ECSPI_CTRL_XCH;
338 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
339 }
340
341 static int mx51_ecspi_config(struct spi_device *spi,
342 struct spi_imx_config *config)
343 {
344 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
345 u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
346 u32 clk = config->speed_hz, delay, reg;
347 u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
348
349 /*
350 * The hardware seems to have a race condition when changing modes. The
351 * current assumption is that the selection of the channel arrives
352 * earlier in the hardware than the mode bits when they are written at
353 * the same time.
354 * So set master mode for all channels as we do not support slave mode.
355 */
356 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
357
358 /* set clock speed */
359 ctrl |= mx51_ecspi_clkdiv(spi_imx, config->speed_hz, &clk);
360 spi_imx->spi_bus_clk = clk;
361
362 /* set chip select to use */
363 ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
364
365 ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET;
366
367 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
368
369 if (spi->mode & SPI_CPHA)
370 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
371 else
372 cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
373
374 if (spi->mode & SPI_CPOL) {
375 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
376 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
377 } else {
378 cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
379 cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
380 }
381 if (spi->mode & SPI_CS_HIGH)
382 cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
383 else
384 cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
385
386 if (spi_imx->usedma)
387 ctrl |= MX51_ECSPI_CTRL_SMC;
388
389 /* CTRL register always go first to bring out controller from reset */
390 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
391
392 reg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
393 if (spi->mode & SPI_LOOP)
394 reg |= MX51_ECSPI_TESTREG_LBC;
395 else
396 reg &= ~MX51_ECSPI_TESTREG_LBC;
397 writel(reg, spi_imx->base + MX51_ECSPI_TESTREG);
398
399 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
400
401 /*
402 * Wait until the changes in the configuration register CONFIGREG
403 * propagate into the hardware. It takes exactly one tick of the
404 * SCLK clock, but we will wait two SCLK clock just to be sure. The
405 * effect of the delay it takes for the hardware to apply changes
406 * is noticable if the SCLK clock run very slow. In such a case, if
407 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
408 * be asserted before the SCLK polarity changes, which would disrupt
409 * the SPI communication as the device on the other end would consider
410 * the change of SCLK polarity as a clock tick already.
411 */
412 delay = (2 * 1000000) / clk;
413 if (likely(delay < 10)) /* SCLK is faster than 100 kHz */
414 udelay(delay);
415 else /* SCLK is _very_ slow */
416 usleep_range(delay, delay + 10);
417
418 /*
419 * Configure the DMA register: setup the watermark
420 * and enable DMA request.
421 */
422
423 writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml) |
424 MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
425 MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
426 MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
427 MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
428
429 return 0;
430 }
431
432 static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
433 {
434 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
435 }
436
437 static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
438 {
439 /* drain receive buffer */
440 while (mx51_ecspi_rx_available(spi_imx))
441 readl(spi_imx->base + MXC_CSPIRXDATA);
442 }
443
444 #define MX31_INTREG_TEEN (1 << 0)
445 #define MX31_INTREG_RREN (1 << 3)
446
447 #define MX31_CSPICTRL_ENABLE (1 << 0)
448 #define MX31_CSPICTRL_MASTER (1 << 1)
449 #define MX31_CSPICTRL_XCH (1 << 2)
450 #define MX31_CSPICTRL_SMC (1 << 3)
451 #define MX31_CSPICTRL_POL (1 << 4)
452 #define MX31_CSPICTRL_PHA (1 << 5)
453 #define MX31_CSPICTRL_SSCTL (1 << 6)
454 #define MX31_CSPICTRL_SSPOL (1 << 7)
455 #define MX31_CSPICTRL_BC_SHIFT 8
456 #define MX35_CSPICTRL_BL_SHIFT 20
457 #define MX31_CSPICTRL_CS_SHIFT 24
458 #define MX35_CSPICTRL_CS_SHIFT 12
459 #define MX31_CSPICTRL_DR_SHIFT 16
460
461 #define MX31_CSPI_DMAREG 0x10
462 #define MX31_DMAREG_RH_DEN (1<<4)
463 #define MX31_DMAREG_TH_DEN (1<<1)
464
465 #define MX31_CSPISTATUS 0x14
466 #define MX31_STATUS_RR (1 << 3)
467
468 #define MX31_CSPI_TESTREG 0x1C
469 #define MX31_TEST_LBC (1 << 14)
470
471 /* These functions also work for the i.MX35, but be aware that
472 * the i.MX35 has a slightly different register layout for bits
473 * we do not use here.
474 */
475 static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
476 {
477 unsigned int val = 0;
478
479 if (enable & MXC_INT_TE)
480 val |= MX31_INTREG_TEEN;
481 if (enable & MXC_INT_RR)
482 val |= MX31_INTREG_RREN;
483
484 writel(val, spi_imx->base + MXC_CSPIINT);
485 }
486
487 static void mx31_trigger(struct spi_imx_data *spi_imx)
488 {
489 unsigned int reg;
490
491 reg = readl(spi_imx->base + MXC_CSPICTRL);
492 reg |= MX31_CSPICTRL_XCH;
493 writel(reg, spi_imx->base + MXC_CSPICTRL);
494 }
495
496 static int mx31_config(struct spi_device *spi, struct spi_imx_config *config)
497 {
498 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
499 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
500 unsigned int clk;
501
502 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
503 MX31_CSPICTRL_DR_SHIFT;
504 spi_imx->spi_bus_clk = clk;
505
506 if (is_imx35_cspi(spi_imx)) {
507 reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
508 reg |= MX31_CSPICTRL_SSCTL;
509 } else {
510 reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
511 }
512
513 if (spi->mode & SPI_CPHA)
514 reg |= MX31_CSPICTRL_PHA;
515 if (spi->mode & SPI_CPOL)
516 reg |= MX31_CSPICTRL_POL;
517 if (spi->mode & SPI_CS_HIGH)
518 reg |= MX31_CSPICTRL_SSPOL;
519 if (spi->cs_gpio < 0)
520 reg |= (spi->cs_gpio + 32) <<
521 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
522 MX31_CSPICTRL_CS_SHIFT);
523
524 if (spi_imx->usedma)
525 reg |= MX31_CSPICTRL_SMC;
526
527 writel(reg, spi_imx->base + MXC_CSPICTRL);
528
529 reg = readl(spi_imx->base + MX31_CSPI_TESTREG);
530 if (spi->mode & SPI_LOOP)
531 reg |= MX31_TEST_LBC;
532 else
533 reg &= ~MX31_TEST_LBC;
534 writel(reg, spi_imx->base + MX31_CSPI_TESTREG);
535
536 if (spi_imx->usedma) {
537 /* configure DMA requests when RXFIFO is half full and
538 when TXFIFO is half empty */
539 writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN,
540 spi_imx->base + MX31_CSPI_DMAREG);
541 }
542
543 return 0;
544 }
545
546 static int mx31_rx_available(struct spi_imx_data *spi_imx)
547 {
548 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
549 }
550
551 static void mx31_reset(struct spi_imx_data *spi_imx)
552 {
553 /* drain receive buffer */
554 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
555 readl(spi_imx->base + MXC_CSPIRXDATA);
556 }
557
558 #define MX21_INTREG_RR (1 << 4)
559 #define MX21_INTREG_TEEN (1 << 9)
560 #define MX21_INTREG_RREN (1 << 13)
561
562 #define MX21_CSPICTRL_POL (1 << 5)
563 #define MX21_CSPICTRL_PHA (1 << 6)
564 #define MX21_CSPICTRL_SSPOL (1 << 8)
565 #define MX21_CSPICTRL_XCH (1 << 9)
566 #define MX21_CSPICTRL_ENABLE (1 << 10)
567 #define MX21_CSPICTRL_MASTER (1 << 11)
568 #define MX21_CSPICTRL_DR_SHIFT 14
569 #define MX21_CSPICTRL_CS_SHIFT 19
570
571 static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
572 {
573 unsigned int val = 0;
574
575 if (enable & MXC_INT_TE)
576 val |= MX21_INTREG_TEEN;
577 if (enable & MXC_INT_RR)
578 val |= MX21_INTREG_RREN;
579
580 writel(val, spi_imx->base + MXC_CSPIINT);
581 }
582
583 static void mx21_trigger(struct spi_imx_data *spi_imx)
584 {
585 unsigned int reg;
586
587 reg = readl(spi_imx->base + MXC_CSPICTRL);
588 reg |= MX21_CSPICTRL_XCH;
589 writel(reg, spi_imx->base + MXC_CSPICTRL);
590 }
591
592 static int mx21_config(struct spi_device *spi, struct spi_imx_config *config)
593 {
594 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
595 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
596 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
597 unsigned int clk;
598
599 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max, &clk)
600 << MX21_CSPICTRL_DR_SHIFT;
601 spi_imx->spi_bus_clk = clk;
602
603 reg |= config->bpw - 1;
604
605 if (spi->mode & SPI_CPHA)
606 reg |= MX21_CSPICTRL_PHA;
607 if (spi->mode & SPI_CPOL)
608 reg |= MX21_CSPICTRL_POL;
609 if (spi->mode & SPI_CS_HIGH)
610 reg |= MX21_CSPICTRL_SSPOL;
611 if (spi->cs_gpio < 0)
612 reg |= (spi->cs_gpio + 32) << MX21_CSPICTRL_CS_SHIFT;
613
614 writel(reg, spi_imx->base + MXC_CSPICTRL);
615
616 return 0;
617 }
618
619 static int mx21_rx_available(struct spi_imx_data *spi_imx)
620 {
621 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
622 }
623
624 static void mx21_reset(struct spi_imx_data *spi_imx)
625 {
626 writel(1, spi_imx->base + MXC_RESET);
627 }
628
629 #define MX1_INTREG_RR (1 << 3)
630 #define MX1_INTREG_TEEN (1 << 8)
631 #define MX1_INTREG_RREN (1 << 11)
632
633 #define MX1_CSPICTRL_POL (1 << 4)
634 #define MX1_CSPICTRL_PHA (1 << 5)
635 #define MX1_CSPICTRL_XCH (1 << 8)
636 #define MX1_CSPICTRL_ENABLE (1 << 9)
637 #define MX1_CSPICTRL_MASTER (1 << 10)
638 #define MX1_CSPICTRL_DR_SHIFT 13
639
640 static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
641 {
642 unsigned int val = 0;
643
644 if (enable & MXC_INT_TE)
645 val |= MX1_INTREG_TEEN;
646 if (enable & MXC_INT_RR)
647 val |= MX1_INTREG_RREN;
648
649 writel(val, spi_imx->base + MXC_CSPIINT);
650 }
651
652 static void mx1_trigger(struct spi_imx_data *spi_imx)
653 {
654 unsigned int reg;
655
656 reg = readl(spi_imx->base + MXC_CSPICTRL);
657 reg |= MX1_CSPICTRL_XCH;
658 writel(reg, spi_imx->base + MXC_CSPICTRL);
659 }
660
661 static int mx1_config(struct spi_device *spi, struct spi_imx_config *config)
662 {
663 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
664 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
665 unsigned int clk;
666
667 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
668 MX1_CSPICTRL_DR_SHIFT;
669 spi_imx->spi_bus_clk = clk;
670
671 reg |= config->bpw - 1;
672
673 if (spi->mode & SPI_CPHA)
674 reg |= MX1_CSPICTRL_PHA;
675 if (spi->mode & SPI_CPOL)
676 reg |= MX1_CSPICTRL_POL;
677
678 writel(reg, spi_imx->base + MXC_CSPICTRL);
679
680 return 0;
681 }
682
683 static int mx1_rx_available(struct spi_imx_data *spi_imx)
684 {
685 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
686 }
687
688 static void mx1_reset(struct spi_imx_data *spi_imx)
689 {
690 writel(1, spi_imx->base + MXC_RESET);
691 }
692
693 static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
694 .intctrl = mx1_intctrl,
695 .config = mx1_config,
696 .trigger = mx1_trigger,
697 .rx_available = mx1_rx_available,
698 .reset = mx1_reset,
699 .devtype = IMX1_CSPI,
700 };
701
702 static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
703 .intctrl = mx21_intctrl,
704 .config = mx21_config,
705 .trigger = mx21_trigger,
706 .rx_available = mx21_rx_available,
707 .reset = mx21_reset,
708 .devtype = IMX21_CSPI,
709 };
710
711 static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
712 /* i.mx27 cspi shares the functions with i.mx21 one */
713 .intctrl = mx21_intctrl,
714 .config = mx21_config,
715 .trigger = mx21_trigger,
716 .rx_available = mx21_rx_available,
717 .reset = mx21_reset,
718 .devtype = IMX27_CSPI,
719 };
720
721 static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
722 .intctrl = mx31_intctrl,
723 .config = mx31_config,
724 .trigger = mx31_trigger,
725 .rx_available = mx31_rx_available,
726 .reset = mx31_reset,
727 .devtype = IMX31_CSPI,
728 };
729
730 static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
731 /* i.mx35 and later cspi shares the functions with i.mx31 one */
732 .intctrl = mx31_intctrl,
733 .config = mx31_config,
734 .trigger = mx31_trigger,
735 .rx_available = mx31_rx_available,
736 .reset = mx31_reset,
737 .devtype = IMX35_CSPI,
738 };
739
740 static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
741 .intctrl = mx51_ecspi_intctrl,
742 .config = mx51_ecspi_config,
743 .trigger = mx51_ecspi_trigger,
744 .rx_available = mx51_ecspi_rx_available,
745 .reset = mx51_ecspi_reset,
746 .devtype = IMX51_ECSPI,
747 };
748
749 static const struct platform_device_id spi_imx_devtype[] = {
750 {
751 .name = "imx1-cspi",
752 .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
753 }, {
754 .name = "imx21-cspi",
755 .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
756 }, {
757 .name = "imx27-cspi",
758 .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
759 }, {
760 .name = "imx31-cspi",
761 .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
762 }, {
763 .name = "imx35-cspi",
764 .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
765 }, {
766 .name = "imx51-ecspi",
767 .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
768 }, {
769 /* sentinel */
770 }
771 };
772
773 static const struct of_device_id spi_imx_dt_ids[] = {
774 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
775 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
776 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
777 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
778 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
779 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
780 { /* sentinel */ }
781 };
782 MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
783
784 static void spi_imx_chipselect(struct spi_device *spi, int is_active)
785 {
786 int active = is_active != BITBANG_CS_INACTIVE;
787 int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
788
789 if (!gpio_is_valid(spi->cs_gpio))
790 return;
791
792 gpio_set_value(spi->cs_gpio, dev_is_lowactive ^ active);
793 }
794
795 static void spi_imx_push(struct spi_imx_data *spi_imx)
796 {
797 while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) {
798 if (!spi_imx->count)
799 break;
800 spi_imx->tx(spi_imx);
801 spi_imx->txfifo++;
802 }
803
804 spi_imx->devtype_data->trigger(spi_imx);
805 }
806
807 static irqreturn_t spi_imx_isr(int irq, void *dev_id)
808 {
809 struct spi_imx_data *spi_imx = dev_id;
810
811 while (spi_imx->devtype_data->rx_available(spi_imx)) {
812 spi_imx->rx(spi_imx);
813 spi_imx->txfifo--;
814 }
815
816 if (spi_imx->count) {
817 spi_imx_push(spi_imx);
818 return IRQ_HANDLED;
819 }
820
821 if (spi_imx->txfifo) {
822 /* No data left to push, but still waiting for rx data,
823 * enable receive data available interrupt.
824 */
825 spi_imx->devtype_data->intctrl(
826 spi_imx, MXC_INT_RR);
827 return IRQ_HANDLED;
828 }
829
830 spi_imx->devtype_data->intctrl(spi_imx, 0);
831 complete(&spi_imx->xfer_done);
832
833 return IRQ_HANDLED;
834 }
835
836 static int spi_imx_dma_configure(struct spi_master *master,
837 int bytes_per_word)
838 {
839 int ret;
840 enum dma_slave_buswidth buswidth;
841 struct dma_slave_config rx = {}, tx = {};
842 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
843
844 switch (bytes_per_word) {
845 case 4:
846 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
847 break;
848 case 2:
849 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
850 break;
851 case 1:
852 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
853 break;
854 default:
855 return -EINVAL;
856 }
857
858 tx.direction = DMA_MEM_TO_DEV;
859 tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
860 tx.dst_addr_width = buswidth;
861 tx.dst_maxburst = spi_imx->wml;
862 ret = dmaengine_slave_config(master->dma_tx, &tx);
863 if (ret) {
864 dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
865 return ret;
866 }
867
868 rx.direction = DMA_DEV_TO_MEM;
869 rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
870 rx.src_addr_width = buswidth;
871 rx.src_maxburst = spi_imx->wml;
872 ret = dmaengine_slave_config(master->dma_rx, &rx);
873 if (ret) {
874 dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
875 return ret;
876 }
877
878 spi_imx->bytes_per_word = bytes_per_word;
879
880 return 0;
881 }
882
883 static int spi_imx_setupxfer(struct spi_device *spi,
884 struct spi_transfer *t)
885 {
886 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
887 struct spi_imx_config config;
888 int ret;
889
890 config.bpw = t ? t->bits_per_word : spi->bits_per_word;
891 config.speed_hz = t ? t->speed_hz : spi->max_speed_hz;
892
893 if (!config.speed_hz)
894 config.speed_hz = spi->max_speed_hz;
895 if (!config.bpw)
896 config.bpw = spi->bits_per_word;
897
898 /* Initialize the functions for transfer */
899 if (config.bpw <= 8) {
900 spi_imx->rx = spi_imx_buf_rx_u8;
901 spi_imx->tx = spi_imx_buf_tx_u8;
902 } else if (config.bpw <= 16) {
903 spi_imx->rx = spi_imx_buf_rx_u16;
904 spi_imx->tx = spi_imx_buf_tx_u16;
905 } else {
906 spi_imx->rx = spi_imx_buf_rx_u32;
907 spi_imx->tx = spi_imx_buf_tx_u32;
908 }
909
910 if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
911 spi_imx->usedma = 1;
912 else
913 spi_imx->usedma = 0;
914
915 if (spi_imx->usedma) {
916 ret = spi_imx_dma_configure(spi->master,
917 spi_imx_bytes_per_word(config.bpw));
918 if (ret)
919 return ret;
920 }
921
922 spi_imx->devtype_data->config(spi, &config);
923
924 return 0;
925 }
926
927 static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
928 {
929 struct spi_master *master = spi_imx->bitbang.master;
930
931 if (master->dma_rx) {
932 dma_release_channel(master->dma_rx);
933 master->dma_rx = NULL;
934 }
935
936 if (master->dma_tx) {
937 dma_release_channel(master->dma_tx);
938 master->dma_tx = NULL;
939 }
940 }
941
942 static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
943 struct spi_master *master)
944 {
945 int ret;
946
947 /* use pio mode for i.mx6dl chip TKT238285 */
948 if (of_machine_is_compatible("fsl,imx6dl"))
949 return 0;
950
951 spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2;
952
953 /* Prepare for TX DMA: */
954 master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
955 if (IS_ERR(master->dma_tx)) {
956 ret = PTR_ERR(master->dma_tx);
957 dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
958 master->dma_tx = NULL;
959 goto err;
960 }
961
962 /* Prepare for RX : */
963 master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
964 if (IS_ERR(master->dma_rx)) {
965 ret = PTR_ERR(master->dma_rx);
966 dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
967 master->dma_rx = NULL;
968 goto err;
969 }
970
971 spi_imx_dma_configure(master, 1);
972
973 init_completion(&spi_imx->dma_rx_completion);
974 init_completion(&spi_imx->dma_tx_completion);
975 master->can_dma = spi_imx_can_dma;
976 master->max_dma_len = MAX_SDMA_BD_BYTES;
977 spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
978 SPI_MASTER_MUST_TX;
979
980 return 0;
981 err:
982 spi_imx_sdma_exit(spi_imx);
983 return ret;
984 }
985
986 static void spi_imx_dma_rx_callback(void *cookie)
987 {
988 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
989
990 complete(&spi_imx->dma_rx_completion);
991 }
992
993 static void spi_imx_dma_tx_callback(void *cookie)
994 {
995 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
996
997 complete(&spi_imx->dma_tx_completion);
998 }
999
1000 static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
1001 {
1002 unsigned long timeout = 0;
1003
1004 /* Time with actual data transfer and CS change delay related to HW */
1005 timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
1006
1007 /* Add extra second for scheduler related activities */
1008 timeout += 1;
1009
1010 /* Double calculated timeout */
1011 return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
1012 }
1013
1014 static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
1015 struct spi_transfer *transfer)
1016 {
1017 struct dma_async_tx_descriptor *desc_tx, *desc_rx;
1018 unsigned long transfer_timeout;
1019 unsigned long timeout;
1020 struct spi_master *master = spi_imx->bitbang.master;
1021 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
1022
1023 /*
1024 * The TX DMA setup starts the transfer, so make sure RX is configured
1025 * before TX.
1026 */
1027 desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
1028 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
1029 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1030 if (!desc_rx)
1031 return -EINVAL;
1032
1033 desc_rx->callback = spi_imx_dma_rx_callback;
1034 desc_rx->callback_param = (void *)spi_imx;
1035 dmaengine_submit(desc_rx);
1036 reinit_completion(&spi_imx->dma_rx_completion);
1037 dma_async_issue_pending(master->dma_rx);
1038
1039 desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
1040 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
1041 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1042 if (!desc_tx) {
1043 dmaengine_terminate_all(master->dma_tx);
1044 return -EINVAL;
1045 }
1046
1047 desc_tx->callback = spi_imx_dma_tx_callback;
1048 desc_tx->callback_param = (void *)spi_imx;
1049 dmaengine_submit(desc_tx);
1050 reinit_completion(&spi_imx->dma_tx_completion);
1051 dma_async_issue_pending(master->dma_tx);
1052
1053 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1054
1055 /* Wait SDMA to finish the data transfer.*/
1056 timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
1057 transfer_timeout);
1058 if (!timeout) {
1059 dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
1060 dmaengine_terminate_all(master->dma_tx);
1061 dmaengine_terminate_all(master->dma_rx);
1062 return -ETIMEDOUT;
1063 }
1064
1065 timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
1066 transfer_timeout);
1067 if (!timeout) {
1068 dev_err(&master->dev, "I/O Error in DMA RX\n");
1069 spi_imx->devtype_data->reset(spi_imx);
1070 dmaengine_terminate_all(master->dma_rx);
1071 return -ETIMEDOUT;
1072 }
1073
1074 return transfer->len;
1075 }
1076
1077 static int spi_imx_pio_transfer(struct spi_device *spi,
1078 struct spi_transfer *transfer)
1079 {
1080 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1081 unsigned long transfer_timeout;
1082 unsigned long timeout;
1083
1084 spi_imx->tx_buf = transfer->tx_buf;
1085 spi_imx->rx_buf = transfer->rx_buf;
1086 spi_imx->count = transfer->len;
1087 spi_imx->txfifo = 0;
1088
1089 reinit_completion(&spi_imx->xfer_done);
1090
1091 spi_imx_push(spi_imx);
1092
1093 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1094
1095 transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
1096
1097 timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
1098 transfer_timeout);
1099 if (!timeout) {
1100 dev_err(&spi->dev, "I/O Error in PIO\n");
1101 spi_imx->devtype_data->reset(spi_imx);
1102 return -ETIMEDOUT;
1103 }
1104
1105 return transfer->len;
1106 }
1107
1108 static int spi_imx_transfer(struct spi_device *spi,
1109 struct spi_transfer *transfer)
1110 {
1111 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1112
1113 if (spi_imx->usedma)
1114 return spi_imx_dma_transfer(spi_imx, transfer);
1115 else
1116 return spi_imx_pio_transfer(spi, transfer);
1117 }
1118
1119 static int spi_imx_setup(struct spi_device *spi)
1120 {
1121 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1122 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1123
1124 if (gpio_is_valid(spi->cs_gpio))
1125 gpio_direction_output(spi->cs_gpio,
1126 spi->mode & SPI_CS_HIGH ? 0 : 1);
1127
1128 spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);
1129
1130 return 0;
1131 }
1132
1133 static void spi_imx_cleanup(struct spi_device *spi)
1134 {
1135 }
1136
1137 static int
1138 spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
1139 {
1140 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1141 int ret;
1142
1143 ret = clk_enable(spi_imx->clk_per);
1144 if (ret)
1145 return ret;
1146
1147 ret = clk_enable(spi_imx->clk_ipg);
1148 if (ret) {
1149 clk_disable(spi_imx->clk_per);
1150 return ret;
1151 }
1152
1153 return 0;
1154 }
1155
1156 static int
1157 spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
1158 {
1159 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1160
1161 clk_disable(spi_imx->clk_ipg);
1162 clk_disable(spi_imx->clk_per);
1163 return 0;
1164 }
1165
1166 static int spi_imx_probe(struct platform_device *pdev)
1167 {
1168 struct device_node *np = pdev->dev.of_node;
1169 const struct of_device_id *of_id =
1170 of_match_device(spi_imx_dt_ids, &pdev->dev);
1171 struct spi_imx_master *mxc_platform_info =
1172 dev_get_platdata(&pdev->dev);
1173 struct spi_master *master;
1174 struct spi_imx_data *spi_imx;
1175 struct resource *res;
1176 int i, ret, irq;
1177
1178 if (!np && !mxc_platform_info) {
1179 dev_err(&pdev->dev, "can't get the platform data\n");
1180 return -EINVAL;
1181 }
1182
1183 master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data));
1184 if (!master)
1185 return -ENOMEM;
1186
1187 platform_set_drvdata(pdev, master);
1188
1189 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1190 master->bus_num = np ? -1 : pdev->id;
1191
1192 spi_imx = spi_master_get_devdata(master);
1193 spi_imx->bitbang.master = master;
1194 spi_imx->dev = &pdev->dev;
1195
1196 spi_imx->devtype_data = of_id ? of_id->data :
1197 (struct spi_imx_devtype_data *)pdev->id_entry->driver_data;
1198
1199 if (mxc_platform_info) {
1200 master->num_chipselect = mxc_platform_info->num_chipselect;
1201 master->cs_gpios = devm_kzalloc(&master->dev,
1202 sizeof(int) * master->num_chipselect, GFP_KERNEL);
1203 if (!master->cs_gpios)
1204 return -ENOMEM;
1205
1206 for (i = 0; i < master->num_chipselect; i++)
1207 master->cs_gpios[i] = mxc_platform_info->chipselect[i];
1208 }
1209
1210 spi_imx->bitbang.chipselect = spi_imx_chipselect;
1211 spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
1212 spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
1213 spi_imx->bitbang.master->setup = spi_imx_setup;
1214 spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
1215 spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
1216 spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
1217 spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1218 if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx))
1219 spi_imx->bitbang.master->mode_bits |= SPI_LOOP;
1220
1221 init_completion(&spi_imx->xfer_done);
1222
1223 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1224 spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1225 if (IS_ERR(spi_imx->base)) {
1226 ret = PTR_ERR(spi_imx->base);
1227 goto out_master_put;
1228 }
1229 spi_imx->base_phys = res->start;
1230
1231 irq = platform_get_irq(pdev, 0);
1232 if (irq < 0) {
1233 ret = irq;
1234 goto out_master_put;
1235 }
1236
1237 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1238 dev_name(&pdev->dev), spi_imx);
1239 if (ret) {
1240 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1241 goto out_master_put;
1242 }
1243
1244 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1245 if (IS_ERR(spi_imx->clk_ipg)) {
1246 ret = PTR_ERR(spi_imx->clk_ipg);
1247 goto out_master_put;
1248 }
1249
1250 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1251 if (IS_ERR(spi_imx->clk_per)) {
1252 ret = PTR_ERR(spi_imx->clk_per);
1253 goto out_master_put;
1254 }
1255
1256 ret = clk_prepare_enable(spi_imx->clk_per);
1257 if (ret)
1258 goto out_master_put;
1259
1260 ret = clk_prepare_enable(spi_imx->clk_ipg);
1261 if (ret)
1262 goto out_put_per;
1263
1264 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1265 /*
1266 * Only validated on i.mx35 and i.mx6 now, can remove the constraint
1267 * if validated on other chips.
1268 */
1269 if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx)) {
1270 ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
1271 if (ret == -EPROBE_DEFER)
1272 goto out_clk_put;
1273
1274 if (ret < 0)
1275 dev_err(&pdev->dev, "dma setup error %d, use pio\n",
1276 ret);
1277 }
1278
1279 spi_imx->devtype_data->reset(spi_imx);
1280
1281 spi_imx->devtype_data->intctrl(spi_imx, 0);
1282
1283 master->dev.of_node = pdev->dev.of_node;
1284 ret = spi_bitbang_start(&spi_imx->bitbang);
1285 if (ret) {
1286 dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
1287 goto out_clk_put;
1288 }
1289
1290 if (!master->cs_gpios) {
1291 dev_err(&pdev->dev, "No CS GPIOs available\n");
1292 ret = -EINVAL;
1293 goto out_clk_put;
1294 }
1295
1296 for (i = 0; i < master->num_chipselect; i++) {
1297 if (!gpio_is_valid(master->cs_gpios[i]))
1298 continue;
1299
1300 ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i],
1301 DRIVER_NAME);
1302 if (ret) {
1303 dev_err(&pdev->dev, "Can't get CS GPIO %i\n",
1304 master->cs_gpios[i]);
1305 goto out_clk_put;
1306 }
1307 }
1308
1309 dev_info(&pdev->dev, "probed\n");
1310
1311 clk_disable(spi_imx->clk_ipg);
1312 clk_disable(spi_imx->clk_per);
1313 return ret;
1314
1315 out_clk_put:
1316 clk_disable_unprepare(spi_imx->clk_ipg);
1317 out_put_per:
1318 clk_disable_unprepare(spi_imx->clk_per);
1319 out_master_put:
1320 spi_master_put(master);
1321
1322 return ret;
1323 }
1324
1325 static int spi_imx_remove(struct platform_device *pdev)
1326 {
1327 struct spi_master *master = platform_get_drvdata(pdev);
1328 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1329
1330 spi_bitbang_stop(&spi_imx->bitbang);
1331
1332 writel(0, spi_imx->base + MXC_CSPICTRL);
1333 clk_unprepare(spi_imx->clk_ipg);
1334 clk_unprepare(spi_imx->clk_per);
1335 spi_imx_sdma_exit(spi_imx);
1336 spi_master_put(master);
1337
1338 return 0;
1339 }
1340
1341 static struct platform_driver spi_imx_driver = {
1342 .driver = {
1343 .name = DRIVER_NAME,
1344 .of_match_table = spi_imx_dt_ids,
1345 },
1346 .id_table = spi_imx_devtype,
1347 .probe = spi_imx_probe,
1348 .remove = spi_imx_remove,
1349 };
1350 module_platform_driver(spi_imx_driver);
1351
1352 MODULE_DESCRIPTION("SPI Master Controller driver");
1353 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1354 MODULE_LICENSE("GPL");
1355 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux with added FPC-III support