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Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[deliverable/linux.git] / drivers / spi / spi-imx.c
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 #define IMX_DMA_TIMEOUT (msecs_to_jiffies(3000))
60 struct spi_imx_config {
61 unsigned int speed_hz;
62 unsigned int bpw;
63 unsigned int mode;
64 u8 cs;
65 };
66
67 enum spi_imx_devtype {
68 IMX1_CSPI,
69 IMX21_CSPI,
70 IMX27_CSPI,
71 IMX31_CSPI,
72 IMX35_CSPI, /* CSPI on all i.mx except above */
73 IMX51_ECSPI, /* ECSPI on i.mx51 and later */
74 };
75
76 struct spi_imx_data;
77
78 struct spi_imx_devtype_data {
79 void (*intctrl)(struct spi_imx_data *, int);
80 int (*config)(struct spi_imx_data *, struct spi_imx_config *);
81 void (*trigger)(struct spi_imx_data *);
82 int (*rx_available)(struct spi_imx_data *);
83 void (*reset)(struct spi_imx_data *);
84 enum spi_imx_devtype devtype;
85 };
86
87 struct spi_imx_data {
88 struct spi_bitbang bitbang;
89
90 struct completion xfer_done;
91 void __iomem *base;
92 struct clk *clk_per;
93 struct clk *clk_ipg;
94 unsigned long spi_clk;
95
96 unsigned int count;
97 void (*tx)(struct spi_imx_data *);
98 void (*rx)(struct spi_imx_data *);
99 void *rx_buf;
100 const void *tx_buf;
101 unsigned int txfifo; /* number of words pushed in tx FIFO */
102
103 /* DMA */
104 unsigned int dma_is_inited;
105 unsigned int dma_finished;
106 bool usedma;
107 u32 rx_wml;
108 u32 tx_wml;
109 u32 rxt_wml;
110 struct completion dma_rx_completion;
111 struct completion dma_tx_completion;
112
113 const struct spi_imx_devtype_data *devtype_data;
114 int chipselect[0];
115 };
116
117 static inline int is_imx27_cspi(struct spi_imx_data *d)
118 {
119 return d->devtype_data->devtype == IMX27_CSPI;
120 }
121
122 static inline int is_imx35_cspi(struct spi_imx_data *d)
123 {
124 return d->devtype_data->devtype == IMX35_CSPI;
125 }
126
127 static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
128 {
129 return (d->devtype_data->devtype == IMX51_ECSPI) ? 64 : 8;
130 }
131
132 #define MXC_SPI_BUF_RX(type) \
133 static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
134 { \
135 unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
136 \
137 if (spi_imx->rx_buf) { \
138 *(type *)spi_imx->rx_buf = val; \
139 spi_imx->rx_buf += sizeof(type); \
140 } \
141 }
142
143 #define MXC_SPI_BUF_TX(type) \
144 static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
145 { \
146 type val = 0; \
147 \
148 if (spi_imx->tx_buf) { \
149 val = *(type *)spi_imx->tx_buf; \
150 spi_imx->tx_buf += sizeof(type); \
151 } \
152 \
153 spi_imx->count -= sizeof(type); \
154 \
155 writel(val, spi_imx->base + MXC_CSPITXDATA); \
156 }
157
158 MXC_SPI_BUF_RX(u8)
159 MXC_SPI_BUF_TX(u8)
160 MXC_SPI_BUF_RX(u16)
161 MXC_SPI_BUF_TX(u16)
162 MXC_SPI_BUF_RX(u32)
163 MXC_SPI_BUF_TX(u32)
164
165 /* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
166 * (which is currently not the case in this driver)
167 */
168 static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
169 256, 384, 512, 768, 1024};
170
171 /* MX21, MX27 */
172 static unsigned int spi_imx_clkdiv_1(unsigned int fin,
173 unsigned int fspi, unsigned int max)
174 {
175 int i;
176
177 for (i = 2; i < max; i++)
178 if (fspi * mxc_clkdivs[i] >= fin)
179 return i;
180
181 return max;
182 }
183
184 /* MX1, MX31, MX35, MX51 CSPI */
185 static unsigned int spi_imx_clkdiv_2(unsigned int fin,
186 unsigned int fspi)
187 {
188 int i, div = 4;
189
190 for (i = 0; i < 7; i++) {
191 if (fspi * div >= fin)
192 return i;
193 div <<= 1;
194 }
195
196 return 7;
197 }
198
199 static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
200 struct spi_transfer *transfer)
201 {
202 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
203
204 if (spi_imx->dma_is_inited && (transfer->len > spi_imx->rx_wml)
205 && (transfer->len > spi_imx->tx_wml))
206 return true;
207 return false;
208 }
209
210 #define MX51_ECSPI_CTRL 0x08
211 #define MX51_ECSPI_CTRL_ENABLE (1 << 0)
212 #define MX51_ECSPI_CTRL_XCH (1 << 2)
213 #define MX51_ECSPI_CTRL_SMC (1 << 3)
214 #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
215 #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
216 #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
217 #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
218 #define MX51_ECSPI_CTRL_BL_OFFSET 20
219
220 #define MX51_ECSPI_CONFIG 0x0c
221 #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
222 #define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
223 #define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
224 #define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
225 #define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
226
227 #define MX51_ECSPI_INT 0x10
228 #define MX51_ECSPI_INT_TEEN (1 << 0)
229 #define MX51_ECSPI_INT_RREN (1 << 3)
230
231 #define MX51_ECSPI_DMA 0x14
232 #define MX51_ECSPI_DMA_TX_WML_OFFSET 0
233 #define MX51_ECSPI_DMA_TX_WML_MASK 0x3F
234 #define MX51_ECSPI_DMA_RX_WML_OFFSET 16
235 #define MX51_ECSPI_DMA_RX_WML_MASK (0x3F << 16)
236 #define MX51_ECSPI_DMA_RXT_WML_OFFSET 24
237 #define MX51_ECSPI_DMA_RXT_WML_MASK (0x3F << 24)
238
239 #define MX51_ECSPI_DMA_TEDEN_OFFSET 7
240 #define MX51_ECSPI_DMA_RXDEN_OFFSET 23
241 #define MX51_ECSPI_DMA_RXTDEN_OFFSET 31
242
243 #define MX51_ECSPI_STAT 0x18
244 #define MX51_ECSPI_STAT_RR (1 << 3)
245
246 /* MX51 eCSPI */
247 static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi,
248 unsigned int *fres)
249 {
250 /*
251 * there are two 4-bit dividers, the pre-divider divides by
252 * $pre, the post-divider by 2^$post
253 */
254 unsigned int pre, post;
255
256 if (unlikely(fspi > fin))
257 return 0;
258
259 post = fls(fin) - fls(fspi);
260 if (fin > fspi << post)
261 post++;
262
263 /* now we have: (fin <= fspi << post) with post being minimal */
264
265 post = max(4U, post) - 4;
266 if (unlikely(post > 0xf)) {
267 pr_err("%s: cannot set clock freq: %u (base freq: %u)\n",
268 __func__, fspi, fin);
269 return 0xff;
270 }
271
272 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
273
274 pr_debug("%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
275 __func__, fin, fspi, post, pre);
276
277 /* Resulting frequency for the SCLK line. */
278 *fres = (fin / (pre + 1)) >> post;
279
280 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
281 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
282 }
283
284 static void __maybe_unused mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
285 {
286 unsigned val = 0;
287
288 if (enable & MXC_INT_TE)
289 val |= MX51_ECSPI_INT_TEEN;
290
291 if (enable & MXC_INT_RR)
292 val |= MX51_ECSPI_INT_RREN;
293
294 writel(val, spi_imx->base + MX51_ECSPI_INT);
295 }
296
297 static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
298 {
299 u32 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
300
301 if (!spi_imx->usedma)
302 reg |= MX51_ECSPI_CTRL_XCH;
303 else if (!spi_imx->dma_finished)
304 reg |= MX51_ECSPI_CTRL_SMC;
305 else
306 reg &= ~MX51_ECSPI_CTRL_SMC;
307 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
308 }
309
310 static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
311 struct spi_imx_config *config)
312 {
313 u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0, dma = 0;
314 u32 tx_wml_cfg, rx_wml_cfg, rxt_wml_cfg;
315 u32 clk = config->speed_hz, delay;
316
317 /*
318 * The hardware seems to have a race condition when changing modes. The
319 * current assumption is that the selection of the channel arrives
320 * earlier in the hardware than the mode bits when they are written at
321 * the same time.
322 * So set master mode for all channels as we do not support slave mode.
323 */
324 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
325
326 /* set clock speed */
327 ctrl |= mx51_ecspi_clkdiv(spi_imx->spi_clk, config->speed_hz, &clk);
328
329 /* set chip select to use */
330 ctrl |= MX51_ECSPI_CTRL_CS(config->cs);
331
332 ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET;
333
334 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs);
335
336 if (config->mode & SPI_CPHA)
337 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
338
339 if (config->mode & SPI_CPOL) {
340 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
341 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
342 }
343 if (config->mode & SPI_CS_HIGH)
344 cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
345
346 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
347 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
348
349 /*
350 * Wait until the changes in the configuration register CONFIGREG
351 * propagate into the hardware. It takes exactly one tick of the
352 * SCLK clock, but we will wait two SCLK clock just to be sure. The
353 * effect of the delay it takes for the hardware to apply changes
354 * is noticable if the SCLK clock run very slow. In such a case, if
355 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
356 * be asserted before the SCLK polarity changes, which would disrupt
357 * the SPI communication as the device on the other end would consider
358 * the change of SCLK polarity as a clock tick already.
359 */
360 delay = (2 * 1000000) / clk;
361 if (likely(delay < 10)) /* SCLK is faster than 100 kHz */
362 udelay(delay);
363 else /* SCLK is _very_ slow */
364 usleep_range(delay, delay + 10);
365
366 /*
367 * Configure the DMA register: setup the watermark
368 * and enable DMA request.
369 */
370 if (spi_imx->dma_is_inited) {
371 dma = readl(spi_imx->base + MX51_ECSPI_DMA);
372
373 spi_imx->rxt_wml = spi_imx_get_fifosize(spi_imx) / 2;
374 rx_wml_cfg = spi_imx->rx_wml << MX51_ECSPI_DMA_RX_WML_OFFSET;
375 tx_wml_cfg = spi_imx->tx_wml << MX51_ECSPI_DMA_TX_WML_OFFSET;
376 rxt_wml_cfg = spi_imx->rxt_wml << MX51_ECSPI_DMA_RXT_WML_OFFSET;
377 dma = (dma & ~MX51_ECSPI_DMA_TX_WML_MASK
378 & ~MX51_ECSPI_DMA_RX_WML_MASK
379 & ~MX51_ECSPI_DMA_RXT_WML_MASK)
380 | rx_wml_cfg | tx_wml_cfg | rxt_wml_cfg
381 |(1 << MX51_ECSPI_DMA_TEDEN_OFFSET)
382 |(1 << MX51_ECSPI_DMA_RXDEN_OFFSET)
383 |(1 << MX51_ECSPI_DMA_RXTDEN_OFFSET);
384
385 writel(dma, spi_imx->base + MX51_ECSPI_DMA);
386 }
387
388 return 0;
389 }
390
391 static int __maybe_unused mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
392 {
393 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
394 }
395
396 static void __maybe_unused mx51_ecspi_reset(struct spi_imx_data *spi_imx)
397 {
398 /* drain receive buffer */
399 while (mx51_ecspi_rx_available(spi_imx))
400 readl(spi_imx->base + MXC_CSPIRXDATA);
401 }
402
403 #define MX31_INTREG_TEEN (1 << 0)
404 #define MX31_INTREG_RREN (1 << 3)
405
406 #define MX31_CSPICTRL_ENABLE (1 << 0)
407 #define MX31_CSPICTRL_MASTER (1 << 1)
408 #define MX31_CSPICTRL_XCH (1 << 2)
409 #define MX31_CSPICTRL_POL (1 << 4)
410 #define MX31_CSPICTRL_PHA (1 << 5)
411 #define MX31_CSPICTRL_SSCTL (1 << 6)
412 #define MX31_CSPICTRL_SSPOL (1 << 7)
413 #define MX31_CSPICTRL_BC_SHIFT 8
414 #define MX35_CSPICTRL_BL_SHIFT 20
415 #define MX31_CSPICTRL_CS_SHIFT 24
416 #define MX35_CSPICTRL_CS_SHIFT 12
417 #define MX31_CSPICTRL_DR_SHIFT 16
418
419 #define MX31_CSPISTATUS 0x14
420 #define MX31_STATUS_RR (1 << 3)
421
422 /* These functions also work for the i.MX35, but be aware that
423 * the i.MX35 has a slightly different register layout for bits
424 * we do not use here.
425 */
426 static void __maybe_unused mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
427 {
428 unsigned int val = 0;
429
430 if (enable & MXC_INT_TE)
431 val |= MX31_INTREG_TEEN;
432 if (enable & MXC_INT_RR)
433 val |= MX31_INTREG_RREN;
434
435 writel(val, spi_imx->base + MXC_CSPIINT);
436 }
437
438 static void __maybe_unused mx31_trigger(struct spi_imx_data *spi_imx)
439 {
440 unsigned int reg;
441
442 reg = readl(spi_imx->base + MXC_CSPICTRL);
443 reg |= MX31_CSPICTRL_XCH;
444 writel(reg, spi_imx->base + MXC_CSPICTRL);
445 }
446
447 static int __maybe_unused mx31_config(struct spi_imx_data *spi_imx,
448 struct spi_imx_config *config)
449 {
450 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
451 int cs = spi_imx->chipselect[config->cs];
452
453 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
454 MX31_CSPICTRL_DR_SHIFT;
455
456 if (is_imx35_cspi(spi_imx)) {
457 reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
458 reg |= MX31_CSPICTRL_SSCTL;
459 } else {
460 reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
461 }
462
463 if (config->mode & SPI_CPHA)
464 reg |= MX31_CSPICTRL_PHA;
465 if (config->mode & SPI_CPOL)
466 reg |= MX31_CSPICTRL_POL;
467 if (config->mode & SPI_CS_HIGH)
468 reg |= MX31_CSPICTRL_SSPOL;
469 if (cs < 0)
470 reg |= (cs + 32) <<
471 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
472 MX31_CSPICTRL_CS_SHIFT);
473
474 writel(reg, spi_imx->base + MXC_CSPICTRL);
475
476 return 0;
477 }
478
479 static int __maybe_unused mx31_rx_available(struct spi_imx_data *spi_imx)
480 {
481 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
482 }
483
484 static void __maybe_unused mx31_reset(struct spi_imx_data *spi_imx)
485 {
486 /* drain receive buffer */
487 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
488 readl(spi_imx->base + MXC_CSPIRXDATA);
489 }
490
491 #define MX21_INTREG_RR (1 << 4)
492 #define MX21_INTREG_TEEN (1 << 9)
493 #define MX21_INTREG_RREN (1 << 13)
494
495 #define MX21_CSPICTRL_POL (1 << 5)
496 #define MX21_CSPICTRL_PHA (1 << 6)
497 #define MX21_CSPICTRL_SSPOL (1 << 8)
498 #define MX21_CSPICTRL_XCH (1 << 9)
499 #define MX21_CSPICTRL_ENABLE (1 << 10)
500 #define MX21_CSPICTRL_MASTER (1 << 11)
501 #define MX21_CSPICTRL_DR_SHIFT 14
502 #define MX21_CSPICTRL_CS_SHIFT 19
503
504 static void __maybe_unused mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
505 {
506 unsigned int val = 0;
507
508 if (enable & MXC_INT_TE)
509 val |= MX21_INTREG_TEEN;
510 if (enable & MXC_INT_RR)
511 val |= MX21_INTREG_RREN;
512
513 writel(val, spi_imx->base + MXC_CSPIINT);
514 }
515
516 static void __maybe_unused mx21_trigger(struct spi_imx_data *spi_imx)
517 {
518 unsigned int reg;
519
520 reg = readl(spi_imx->base + MXC_CSPICTRL);
521 reg |= MX21_CSPICTRL_XCH;
522 writel(reg, spi_imx->base + MXC_CSPICTRL);
523 }
524
525 static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx,
526 struct spi_imx_config *config)
527 {
528 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
529 int cs = spi_imx->chipselect[config->cs];
530 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
531
532 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
533 MX21_CSPICTRL_DR_SHIFT;
534 reg |= config->bpw - 1;
535
536 if (config->mode & SPI_CPHA)
537 reg |= MX21_CSPICTRL_PHA;
538 if (config->mode & SPI_CPOL)
539 reg |= MX21_CSPICTRL_POL;
540 if (config->mode & SPI_CS_HIGH)
541 reg |= MX21_CSPICTRL_SSPOL;
542 if (cs < 0)
543 reg |= (cs + 32) << MX21_CSPICTRL_CS_SHIFT;
544
545 writel(reg, spi_imx->base + MXC_CSPICTRL);
546
547 return 0;
548 }
549
550 static int __maybe_unused mx21_rx_available(struct spi_imx_data *spi_imx)
551 {
552 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
553 }
554
555 static void __maybe_unused mx21_reset(struct spi_imx_data *spi_imx)
556 {
557 writel(1, spi_imx->base + MXC_RESET);
558 }
559
560 #define MX1_INTREG_RR (1 << 3)
561 #define MX1_INTREG_TEEN (1 << 8)
562 #define MX1_INTREG_RREN (1 << 11)
563
564 #define MX1_CSPICTRL_POL (1 << 4)
565 #define MX1_CSPICTRL_PHA (1 << 5)
566 #define MX1_CSPICTRL_XCH (1 << 8)
567 #define MX1_CSPICTRL_ENABLE (1 << 9)
568 #define MX1_CSPICTRL_MASTER (1 << 10)
569 #define MX1_CSPICTRL_DR_SHIFT 13
570
571 static void __maybe_unused mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
572 {
573 unsigned int val = 0;
574
575 if (enable & MXC_INT_TE)
576 val |= MX1_INTREG_TEEN;
577 if (enable & MXC_INT_RR)
578 val |= MX1_INTREG_RREN;
579
580 writel(val, spi_imx->base + MXC_CSPIINT);
581 }
582
583 static void __maybe_unused mx1_trigger(struct spi_imx_data *spi_imx)
584 {
585 unsigned int reg;
586
587 reg = readl(spi_imx->base + MXC_CSPICTRL);
588 reg |= MX1_CSPICTRL_XCH;
589 writel(reg, spi_imx->base + MXC_CSPICTRL);
590 }
591
592 static int __maybe_unused mx1_config(struct spi_imx_data *spi_imx,
593 struct spi_imx_config *config)
594 {
595 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
596
597 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
598 MX1_CSPICTRL_DR_SHIFT;
599 reg |= config->bpw - 1;
600
601 if (config->mode & SPI_CPHA)
602 reg |= MX1_CSPICTRL_PHA;
603 if (config->mode & SPI_CPOL)
604 reg |= MX1_CSPICTRL_POL;
605
606 writel(reg, spi_imx->base + MXC_CSPICTRL);
607
608 return 0;
609 }
610
611 static int __maybe_unused mx1_rx_available(struct spi_imx_data *spi_imx)
612 {
613 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
614 }
615
616 static void __maybe_unused mx1_reset(struct spi_imx_data *spi_imx)
617 {
618 writel(1, spi_imx->base + MXC_RESET);
619 }
620
621 static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
622 .intctrl = mx1_intctrl,
623 .config = mx1_config,
624 .trigger = mx1_trigger,
625 .rx_available = mx1_rx_available,
626 .reset = mx1_reset,
627 .devtype = IMX1_CSPI,
628 };
629
630 static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
631 .intctrl = mx21_intctrl,
632 .config = mx21_config,
633 .trigger = mx21_trigger,
634 .rx_available = mx21_rx_available,
635 .reset = mx21_reset,
636 .devtype = IMX21_CSPI,
637 };
638
639 static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
640 /* i.mx27 cspi shares the functions with i.mx21 one */
641 .intctrl = mx21_intctrl,
642 .config = mx21_config,
643 .trigger = mx21_trigger,
644 .rx_available = mx21_rx_available,
645 .reset = mx21_reset,
646 .devtype = IMX27_CSPI,
647 };
648
649 static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
650 .intctrl = mx31_intctrl,
651 .config = mx31_config,
652 .trigger = mx31_trigger,
653 .rx_available = mx31_rx_available,
654 .reset = mx31_reset,
655 .devtype = IMX31_CSPI,
656 };
657
658 static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
659 /* i.mx35 and later cspi shares the functions with i.mx31 one */
660 .intctrl = mx31_intctrl,
661 .config = mx31_config,
662 .trigger = mx31_trigger,
663 .rx_available = mx31_rx_available,
664 .reset = mx31_reset,
665 .devtype = IMX35_CSPI,
666 };
667
668 static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
669 .intctrl = mx51_ecspi_intctrl,
670 .config = mx51_ecspi_config,
671 .trigger = mx51_ecspi_trigger,
672 .rx_available = mx51_ecspi_rx_available,
673 .reset = mx51_ecspi_reset,
674 .devtype = IMX51_ECSPI,
675 };
676
677 static struct platform_device_id spi_imx_devtype[] = {
678 {
679 .name = "imx1-cspi",
680 .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
681 }, {
682 .name = "imx21-cspi",
683 .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
684 }, {
685 .name = "imx27-cspi",
686 .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
687 }, {
688 .name = "imx31-cspi",
689 .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
690 }, {
691 .name = "imx35-cspi",
692 .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
693 }, {
694 .name = "imx51-ecspi",
695 .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
696 }, {
697 /* sentinel */
698 }
699 };
700
701 static const struct of_device_id spi_imx_dt_ids[] = {
702 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
703 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
704 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
705 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
706 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
707 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
708 { /* sentinel */ }
709 };
710 MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
711
712 static void spi_imx_chipselect(struct spi_device *spi, int is_active)
713 {
714 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
715 int gpio = spi_imx->chipselect[spi->chip_select];
716 int active = is_active != BITBANG_CS_INACTIVE;
717 int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
718
719 if (!gpio_is_valid(gpio))
720 return;
721
722 gpio_set_value(gpio, dev_is_lowactive ^ active);
723 }
724
725 static void spi_imx_push(struct spi_imx_data *spi_imx)
726 {
727 while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) {
728 if (!spi_imx->count)
729 break;
730 spi_imx->tx(spi_imx);
731 spi_imx->txfifo++;
732 }
733
734 spi_imx->devtype_data->trigger(spi_imx);
735 }
736
737 static irqreturn_t spi_imx_isr(int irq, void *dev_id)
738 {
739 struct spi_imx_data *spi_imx = dev_id;
740
741 while (spi_imx->devtype_data->rx_available(spi_imx)) {
742 spi_imx->rx(spi_imx);
743 spi_imx->txfifo--;
744 }
745
746 if (spi_imx->count) {
747 spi_imx_push(spi_imx);
748 return IRQ_HANDLED;
749 }
750
751 if (spi_imx->txfifo) {
752 /* No data left to push, but still waiting for rx data,
753 * enable receive data available interrupt.
754 */
755 spi_imx->devtype_data->intctrl(
756 spi_imx, MXC_INT_RR);
757 return IRQ_HANDLED;
758 }
759
760 spi_imx->devtype_data->intctrl(spi_imx, 0);
761 complete(&spi_imx->xfer_done);
762
763 return IRQ_HANDLED;
764 }
765
766 static int spi_imx_setupxfer(struct spi_device *spi,
767 struct spi_transfer *t)
768 {
769 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
770 struct spi_imx_config config;
771
772 config.bpw = t ? t->bits_per_word : spi->bits_per_word;
773 config.speed_hz = t ? t->speed_hz : spi->max_speed_hz;
774 config.mode = spi->mode;
775 config.cs = spi->chip_select;
776
777 if (!config.speed_hz)
778 config.speed_hz = spi->max_speed_hz;
779 if (!config.bpw)
780 config.bpw = spi->bits_per_word;
781
782 /* Initialize the functions for transfer */
783 if (config.bpw <= 8) {
784 spi_imx->rx = spi_imx_buf_rx_u8;
785 spi_imx->tx = spi_imx_buf_tx_u8;
786 } else if (config.bpw <= 16) {
787 spi_imx->rx = spi_imx_buf_rx_u16;
788 spi_imx->tx = spi_imx_buf_tx_u16;
789 } else {
790 spi_imx->rx = spi_imx_buf_rx_u32;
791 spi_imx->tx = spi_imx_buf_tx_u32;
792 }
793
794 spi_imx->devtype_data->config(spi_imx, &config);
795
796 return 0;
797 }
798
799 static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
800 {
801 struct spi_master *master = spi_imx->bitbang.master;
802
803 if (master->dma_rx) {
804 dma_release_channel(master->dma_rx);
805 master->dma_rx = NULL;
806 }
807
808 if (master->dma_tx) {
809 dma_release_channel(master->dma_tx);
810 master->dma_tx = NULL;
811 }
812
813 spi_imx->dma_is_inited = 0;
814 }
815
816 static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
817 struct spi_master *master,
818 const struct resource *res)
819 {
820 struct dma_slave_config slave_config = {};
821 int ret;
822
823 /* use pio mode for i.mx6dl chip TKT238285 */
824 if (of_machine_is_compatible("fsl,imx6dl"))
825 return 0;
826
827 /* Prepare for TX DMA: */
828 master->dma_tx = dma_request_slave_channel(dev, "tx");
829 if (!master->dma_tx) {
830 dev_err(dev, "cannot get the TX DMA channel!\n");
831 ret = -EINVAL;
832 goto err;
833 }
834
835 slave_config.direction = DMA_MEM_TO_DEV;
836 slave_config.dst_addr = res->start + MXC_CSPITXDATA;
837 slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
838 slave_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) / 2;
839 ret = dmaengine_slave_config(master->dma_tx, &slave_config);
840 if (ret) {
841 dev_err(dev, "error in TX dma configuration.\n");
842 goto err;
843 }
844
845 /* Prepare for RX : */
846 master->dma_rx = dma_request_slave_channel(dev, "rx");
847 if (!master->dma_rx) {
848 dev_dbg(dev, "cannot get the DMA channel.\n");
849 ret = -EINVAL;
850 goto err;
851 }
852
853 slave_config.direction = DMA_DEV_TO_MEM;
854 slave_config.src_addr = res->start + MXC_CSPIRXDATA;
855 slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
856 slave_config.src_maxburst = spi_imx_get_fifosize(spi_imx) / 2;
857 ret = dmaengine_slave_config(master->dma_rx, &slave_config);
858 if (ret) {
859 dev_err(dev, "error in RX dma configuration.\n");
860 goto err;
861 }
862
863 init_completion(&spi_imx->dma_rx_completion);
864 init_completion(&spi_imx->dma_tx_completion);
865 master->can_dma = spi_imx_can_dma;
866 master->max_dma_len = MAX_SDMA_BD_BYTES;
867 spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
868 SPI_MASTER_MUST_TX;
869 spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2;
870 spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2;
871 spi_imx->dma_is_inited = 1;
872
873 return 0;
874 err:
875 spi_imx_sdma_exit(spi_imx);
876 return ret;
877 }
878
879 static void spi_imx_dma_rx_callback(void *cookie)
880 {
881 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
882
883 complete(&spi_imx->dma_rx_completion);
884 }
885
886 static void spi_imx_dma_tx_callback(void *cookie)
887 {
888 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
889
890 complete(&spi_imx->dma_tx_completion);
891 }
892
893 static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
894 struct spi_transfer *transfer)
895 {
896 struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
897 int ret;
898 unsigned long timeout;
899 u32 dma;
900 int left;
901 struct spi_master *master = spi_imx->bitbang.master;
902 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
903
904 if (tx) {
905 desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
906 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
907 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
908 if (!desc_tx)
909 goto no_dma;
910
911 desc_tx->callback = spi_imx_dma_tx_callback;
912 desc_tx->callback_param = (void *)spi_imx;
913 dmaengine_submit(desc_tx);
914 }
915
916 if (rx) {
917 desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
918 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
919 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
920 if (!desc_rx)
921 goto no_dma;
922
923 desc_rx->callback = spi_imx_dma_rx_callback;
924 desc_rx->callback_param = (void *)spi_imx;
925 dmaengine_submit(desc_rx);
926 }
927
928 reinit_completion(&spi_imx->dma_rx_completion);
929 reinit_completion(&spi_imx->dma_tx_completion);
930
931 /* Trigger the cspi module. */
932 spi_imx->dma_finished = 0;
933
934 dma = readl(spi_imx->base + MX51_ECSPI_DMA);
935 dma = dma & (~MX51_ECSPI_DMA_RXT_WML_MASK);
936 /* Change RX_DMA_LENGTH trigger dma fetch tail data */
937 left = transfer->len % spi_imx->rxt_wml;
938 if (left)
939 writel(dma | (left << MX51_ECSPI_DMA_RXT_WML_OFFSET),
940 spi_imx->base + MX51_ECSPI_DMA);
941 spi_imx->devtype_data->trigger(spi_imx);
942
943 dma_async_issue_pending(master->dma_tx);
944 dma_async_issue_pending(master->dma_rx);
945 /* Wait SDMA to finish the data transfer.*/
946 timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
947 IMX_DMA_TIMEOUT);
948 if (!timeout) {
949 pr_warn("%s %s: I/O Error in DMA TX\n",
950 dev_driver_string(&master->dev),
951 dev_name(&master->dev));
952 dmaengine_terminate_all(master->dma_tx);
953 } else {
954 timeout = wait_for_completion_timeout(
955 &spi_imx->dma_rx_completion, IMX_DMA_TIMEOUT);
956 if (!timeout) {
957 pr_warn("%s %s: I/O Error in DMA RX\n",
958 dev_driver_string(&master->dev),
959 dev_name(&master->dev));
960 spi_imx->devtype_data->reset(spi_imx);
961 dmaengine_terminate_all(master->dma_rx);
962 }
963 writel(dma |
964 spi_imx->rxt_wml << MX51_ECSPI_DMA_RXT_WML_OFFSET,
965 spi_imx->base + MX51_ECSPI_DMA);
966 }
967
968 spi_imx->dma_finished = 1;
969 spi_imx->devtype_data->trigger(spi_imx);
970
971 if (!timeout)
972 ret = -ETIMEDOUT;
973 else
974 ret = transfer->len;
975
976 return ret;
977
978 no_dma:
979 pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
980 dev_driver_string(&master->dev),
981 dev_name(&master->dev));
982 return -EAGAIN;
983 }
984
985 static int spi_imx_pio_transfer(struct spi_device *spi,
986 struct spi_transfer *transfer)
987 {
988 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
989
990 spi_imx->tx_buf = transfer->tx_buf;
991 spi_imx->rx_buf = transfer->rx_buf;
992 spi_imx->count = transfer->len;
993 spi_imx->txfifo = 0;
994
995 reinit_completion(&spi_imx->xfer_done);
996
997 spi_imx_push(spi_imx);
998
999 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1000
1001 wait_for_completion(&spi_imx->xfer_done);
1002
1003 return transfer->len;
1004 }
1005
1006 static int spi_imx_transfer(struct spi_device *spi,
1007 struct spi_transfer *transfer)
1008 {
1009 int ret;
1010 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1011
1012 if (spi_imx->bitbang.master->can_dma &&
1013 spi_imx_can_dma(spi_imx->bitbang.master, spi, transfer)) {
1014 spi_imx->usedma = true;
1015 ret = spi_imx_dma_transfer(spi_imx, transfer);
1016 if (ret != -EAGAIN)
1017 return ret;
1018 }
1019 spi_imx->usedma = false;
1020
1021 return spi_imx_pio_transfer(spi, transfer);
1022 }
1023
1024 static int spi_imx_setup(struct spi_device *spi)
1025 {
1026 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1027 int gpio = spi_imx->chipselect[spi->chip_select];
1028
1029 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1030 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1031
1032 if (gpio_is_valid(gpio))
1033 gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
1034
1035 spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);
1036
1037 return 0;
1038 }
1039
1040 static void spi_imx_cleanup(struct spi_device *spi)
1041 {
1042 }
1043
1044 static int
1045 spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
1046 {
1047 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1048 int ret;
1049
1050 ret = clk_enable(spi_imx->clk_per);
1051 if (ret)
1052 return ret;
1053
1054 ret = clk_enable(spi_imx->clk_ipg);
1055 if (ret) {
1056 clk_disable(spi_imx->clk_per);
1057 return ret;
1058 }
1059
1060 return 0;
1061 }
1062
1063 static int
1064 spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
1065 {
1066 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1067
1068 clk_disable(spi_imx->clk_ipg);
1069 clk_disable(spi_imx->clk_per);
1070 return 0;
1071 }
1072
1073 static int spi_imx_probe(struct platform_device *pdev)
1074 {
1075 struct device_node *np = pdev->dev.of_node;
1076 const struct of_device_id *of_id =
1077 of_match_device(spi_imx_dt_ids, &pdev->dev);
1078 struct spi_imx_master *mxc_platform_info =
1079 dev_get_platdata(&pdev->dev);
1080 struct spi_master *master;
1081 struct spi_imx_data *spi_imx;
1082 struct resource *res;
1083 int i, ret, num_cs, irq;
1084
1085 if (!np && !mxc_platform_info) {
1086 dev_err(&pdev->dev, "can't get the platform data\n");
1087 return -EINVAL;
1088 }
1089
1090 ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
1091 if (ret < 0) {
1092 if (mxc_platform_info)
1093 num_cs = mxc_platform_info->num_chipselect;
1094 else
1095 return ret;
1096 }
1097
1098 master = spi_alloc_master(&pdev->dev,
1099 sizeof(struct spi_imx_data) + sizeof(int) * num_cs);
1100 if (!master)
1101 return -ENOMEM;
1102
1103 platform_set_drvdata(pdev, master);
1104
1105 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1106 master->bus_num = pdev->id;
1107 master->num_chipselect = num_cs;
1108
1109 spi_imx = spi_master_get_devdata(master);
1110 spi_imx->bitbang.master = master;
1111
1112 for (i = 0; i < master->num_chipselect; i++) {
1113 int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
1114 if (!gpio_is_valid(cs_gpio) && mxc_platform_info)
1115 cs_gpio = mxc_platform_info->chipselect[i];
1116
1117 spi_imx->chipselect[i] = cs_gpio;
1118 if (!gpio_is_valid(cs_gpio))
1119 continue;
1120
1121 ret = devm_gpio_request(&pdev->dev, spi_imx->chipselect[i],
1122 DRIVER_NAME);
1123 if (ret) {
1124 dev_err(&pdev->dev, "can't get cs gpios\n");
1125 goto out_master_put;
1126 }
1127 }
1128
1129 spi_imx->bitbang.chipselect = spi_imx_chipselect;
1130 spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
1131 spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
1132 spi_imx->bitbang.master->setup = spi_imx_setup;
1133 spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
1134 spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
1135 spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
1136 spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1137
1138 init_completion(&spi_imx->xfer_done);
1139
1140 spi_imx->devtype_data = of_id ? of_id->data :
1141 (struct spi_imx_devtype_data *) pdev->id_entry->driver_data;
1142
1143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1144 spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1145 if (IS_ERR(spi_imx->base)) {
1146 ret = PTR_ERR(spi_imx->base);
1147 goto out_master_put;
1148 }
1149
1150 irq = platform_get_irq(pdev, 0);
1151 if (irq < 0) {
1152 ret = irq;
1153 goto out_master_put;
1154 }
1155
1156 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1157 dev_name(&pdev->dev), spi_imx);
1158 if (ret) {
1159 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1160 goto out_master_put;
1161 }
1162
1163 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1164 if (IS_ERR(spi_imx->clk_ipg)) {
1165 ret = PTR_ERR(spi_imx->clk_ipg);
1166 goto out_master_put;
1167 }
1168
1169 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1170 if (IS_ERR(spi_imx->clk_per)) {
1171 ret = PTR_ERR(spi_imx->clk_per);
1172 goto out_master_put;
1173 }
1174
1175 ret = clk_prepare_enable(spi_imx->clk_per);
1176 if (ret)
1177 goto out_master_put;
1178
1179 ret = clk_prepare_enable(spi_imx->clk_ipg);
1180 if (ret)
1181 goto out_put_per;
1182
1183 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1184 /*
1185 * Only validated on i.mx6 now, can remove the constrain if validated on
1186 * other chips.
1187 */
1188 if (spi_imx->devtype_data == &imx51_ecspi_devtype_data
1189 && spi_imx_sdma_init(&pdev->dev, spi_imx, master, res))
1190 dev_err(&pdev->dev, "dma setup error,use pio instead\n");
1191
1192 spi_imx->devtype_data->reset(spi_imx);
1193
1194 spi_imx->devtype_data->intctrl(spi_imx, 0);
1195
1196 master->dev.of_node = pdev->dev.of_node;
1197 ret = spi_bitbang_start(&spi_imx->bitbang);
1198 if (ret) {
1199 dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
1200 goto out_clk_put;
1201 }
1202
1203 dev_info(&pdev->dev, "probed\n");
1204
1205 clk_disable(spi_imx->clk_ipg);
1206 clk_disable(spi_imx->clk_per);
1207 return ret;
1208
1209 out_clk_put:
1210 clk_disable_unprepare(spi_imx->clk_ipg);
1211 out_put_per:
1212 clk_disable_unprepare(spi_imx->clk_per);
1213 out_master_put:
1214 spi_master_put(master);
1215
1216 return ret;
1217 }
1218
1219 static int spi_imx_remove(struct platform_device *pdev)
1220 {
1221 struct spi_master *master = platform_get_drvdata(pdev);
1222 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1223
1224 spi_bitbang_stop(&spi_imx->bitbang);
1225
1226 writel(0, spi_imx->base + MXC_CSPICTRL);
1227 clk_unprepare(spi_imx->clk_ipg);
1228 clk_unprepare(spi_imx->clk_per);
1229 spi_imx_sdma_exit(spi_imx);
1230 spi_master_put(master);
1231
1232 return 0;
1233 }
1234
1235 static struct platform_driver spi_imx_driver = {
1236 .driver = {
1237 .name = DRIVER_NAME,
1238 .of_match_table = spi_imx_dt_ids,
1239 },
1240 .id_table = spi_imx_devtype,
1241 .probe = spi_imx_probe,
1242 .remove = spi_imx_remove,
1243 };
1244 module_platform_driver(spi_imx_driver);
1245
1246 MODULE_DESCRIPTION("SPI Master Controller driver");
1247 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1248 MODULE_LICENSE("GPL");
1249 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux kernel - Deliverables
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