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Merge tag 'for-4.4' of git://git.osdn.jp/gitroot/uclinux-h8/linux
[mirror_ubuntu-zesty-kernel.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
205 && transfer->len > spi_imx->rx_wml * sizeof(u32)
206 && transfer->len > spi_imx->tx_wml * sizeof(u32))
207 return true;
208 return false;
209 }
210
211 #define MX51_ECSPI_CTRL 0x08
212 #define MX51_ECSPI_CTRL_ENABLE (1 << 0)
213 #define MX51_ECSPI_CTRL_XCH (1 << 2)
214 #define MX51_ECSPI_CTRL_SMC (1 << 3)
215 #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
216 #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
217 #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
218 #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
219 #define MX51_ECSPI_CTRL_BL_OFFSET 20
220
221 #define MX51_ECSPI_CONFIG 0x0c
222 #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
223 #define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
224 #define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
225 #define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
226 #define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
227
228 #define MX51_ECSPI_INT 0x10
229 #define MX51_ECSPI_INT_TEEN (1 << 0)
230 #define MX51_ECSPI_INT_RREN (1 << 3)
231
232 #define MX51_ECSPI_DMA 0x14
233 #define MX51_ECSPI_DMA_TX_WML_OFFSET 0
234 #define MX51_ECSPI_DMA_TX_WML_MASK 0x3F
235 #define MX51_ECSPI_DMA_RX_WML_OFFSET 16
236 #define MX51_ECSPI_DMA_RX_WML_MASK (0x3F << 16)
237 #define MX51_ECSPI_DMA_RXT_WML_OFFSET 24
238 #define MX51_ECSPI_DMA_RXT_WML_MASK (0x3F << 24)
239
240 #define MX51_ECSPI_DMA_TEDEN_OFFSET 7
241 #define MX51_ECSPI_DMA_RXDEN_OFFSET 23
242 #define MX51_ECSPI_DMA_RXTDEN_OFFSET 31
243
244 #define MX51_ECSPI_STAT 0x18
245 #define MX51_ECSPI_STAT_RR (1 << 3)
246
247 /* MX51 eCSPI */
248 static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi,
249 unsigned int *fres)
250 {
251 /*
252 * there are two 4-bit dividers, the pre-divider divides by
253 * $pre, the post-divider by 2^$post
254 */
255 unsigned int pre, post;
256
257 if (unlikely(fspi > fin))
258 return 0;
259
260 post = fls(fin) - fls(fspi);
261 if (fin > fspi << post)
262 post++;
263
264 /* now we have: (fin <= fspi << post) with post being minimal */
265
266 post = max(4U, post) - 4;
267 if (unlikely(post > 0xf)) {
268 pr_err("%s: cannot set clock freq: %u (base freq: %u)\n",
269 __func__, fspi, fin);
270 return 0xff;
271 }
272
273 pre = DIV_ROUND_UP(fin, fspi << post) - 1;
274
275 pr_debug("%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
276 __func__, fin, fspi, post, pre);
277
278 /* Resulting frequency for the SCLK line. */
279 *fres = (fin / (pre + 1)) >> post;
280
281 return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
282 (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
283 }
284
285 static void __maybe_unused mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
286 {
287 unsigned val = 0;
288
289 if (enable & MXC_INT_TE)
290 val |= MX51_ECSPI_INT_TEEN;
291
292 if (enable & MXC_INT_RR)
293 val |= MX51_ECSPI_INT_RREN;
294
295 writel(val, spi_imx->base + MX51_ECSPI_INT);
296 }
297
298 static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
299 {
300 u32 reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
301
302 if (!spi_imx->usedma)
303 reg |= MX51_ECSPI_CTRL_XCH;
304 else if (!spi_imx->dma_finished)
305 reg |= MX51_ECSPI_CTRL_SMC;
306 else
307 reg &= ~MX51_ECSPI_CTRL_SMC;
308 writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
309 }
310
311 static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
312 struct spi_imx_config *config)
313 {
314 u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0, dma = 0;
315 u32 tx_wml_cfg, rx_wml_cfg, rxt_wml_cfg;
316 u32 clk = config->speed_hz, delay;
317
318 /*
319 * The hardware seems to have a race condition when changing modes. The
320 * current assumption is that the selection of the channel arrives
321 * earlier in the hardware than the mode bits when they are written at
322 * the same time.
323 * So set master mode for all channels as we do not support slave mode.
324 */
325 ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
326
327 /* set clock speed */
328 ctrl |= mx51_ecspi_clkdiv(spi_imx->spi_clk, config->speed_hz, &clk);
329
330 /* set chip select to use */
331 ctrl |= MX51_ECSPI_CTRL_CS(config->cs);
332
333 ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET;
334
335 cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs);
336
337 if (config->mode & SPI_CPHA)
338 cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
339 else
340 cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(config->cs);
341
342 if (config->mode & SPI_CPOL) {
343 cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
344 cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
345 } else {
346 cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(config->cs);
347 cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(config->cs);
348 }
349 if (config->mode & SPI_CS_HIGH)
350 cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
351 else
352 cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(config->cs);
353
354 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
355 writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
356
357 /*
358 * Wait until the changes in the configuration register CONFIGREG
359 * propagate into the hardware. It takes exactly one tick of the
360 * SCLK clock, but we will wait two SCLK clock just to be sure. The
361 * effect of the delay it takes for the hardware to apply changes
362 * is noticable if the SCLK clock run very slow. In such a case, if
363 * the polarity of SCLK should be inverted, the GPIO ChipSelect might
364 * be asserted before the SCLK polarity changes, which would disrupt
365 * the SPI communication as the device on the other end would consider
366 * the change of SCLK polarity as a clock tick already.
367 */
368 delay = (2 * 1000000) / clk;
369 if (likely(delay < 10)) /* SCLK is faster than 100 kHz */
370 udelay(delay);
371 else /* SCLK is _very_ slow */
372 usleep_range(delay, delay + 10);
373
374 /*
375 * Configure the DMA register: setup the watermark
376 * and enable DMA request.
377 */
378 if (spi_imx->dma_is_inited) {
379 dma = readl(spi_imx->base + MX51_ECSPI_DMA);
380
381 spi_imx->rxt_wml = spi_imx_get_fifosize(spi_imx) / 2;
382 rx_wml_cfg = spi_imx->rx_wml << MX51_ECSPI_DMA_RX_WML_OFFSET;
383 tx_wml_cfg = spi_imx->tx_wml << MX51_ECSPI_DMA_TX_WML_OFFSET;
384 rxt_wml_cfg = spi_imx->rxt_wml << MX51_ECSPI_DMA_RXT_WML_OFFSET;
385 dma = (dma & ~MX51_ECSPI_DMA_TX_WML_MASK
386 & ~MX51_ECSPI_DMA_RX_WML_MASK
387 & ~MX51_ECSPI_DMA_RXT_WML_MASK)
388 | rx_wml_cfg | tx_wml_cfg | rxt_wml_cfg
389 |(1 << MX51_ECSPI_DMA_TEDEN_OFFSET)
390 |(1 << MX51_ECSPI_DMA_RXDEN_OFFSET)
391 |(1 << MX51_ECSPI_DMA_RXTDEN_OFFSET);
392
393 writel(dma, spi_imx->base + MX51_ECSPI_DMA);
394 }
395
396 return 0;
397 }
398
399 static int __maybe_unused mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
400 {
401 return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
402 }
403
404 static void __maybe_unused mx51_ecspi_reset(struct spi_imx_data *spi_imx)
405 {
406 /* drain receive buffer */
407 while (mx51_ecspi_rx_available(spi_imx))
408 readl(spi_imx->base + MXC_CSPIRXDATA);
409 }
410
411 #define MX31_INTREG_TEEN (1 << 0)
412 #define MX31_INTREG_RREN (1 << 3)
413
414 #define MX31_CSPICTRL_ENABLE (1 << 0)
415 #define MX31_CSPICTRL_MASTER (1 << 1)
416 #define MX31_CSPICTRL_XCH (1 << 2)
417 #define MX31_CSPICTRL_POL (1 << 4)
418 #define MX31_CSPICTRL_PHA (1 << 5)
419 #define MX31_CSPICTRL_SSCTL (1 << 6)
420 #define MX31_CSPICTRL_SSPOL (1 << 7)
421 #define MX31_CSPICTRL_BC_SHIFT 8
422 #define MX35_CSPICTRL_BL_SHIFT 20
423 #define MX31_CSPICTRL_CS_SHIFT 24
424 #define MX35_CSPICTRL_CS_SHIFT 12
425 #define MX31_CSPICTRL_DR_SHIFT 16
426
427 #define MX31_CSPISTATUS 0x14
428 #define MX31_STATUS_RR (1 << 3)
429
430 /* These functions also work for the i.MX35, but be aware that
431 * the i.MX35 has a slightly different register layout for bits
432 * we do not use here.
433 */
434 static void __maybe_unused mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
435 {
436 unsigned int val = 0;
437
438 if (enable & MXC_INT_TE)
439 val |= MX31_INTREG_TEEN;
440 if (enable & MXC_INT_RR)
441 val |= MX31_INTREG_RREN;
442
443 writel(val, spi_imx->base + MXC_CSPIINT);
444 }
445
446 static void __maybe_unused mx31_trigger(struct spi_imx_data *spi_imx)
447 {
448 unsigned int reg;
449
450 reg = readl(spi_imx->base + MXC_CSPICTRL);
451 reg |= MX31_CSPICTRL_XCH;
452 writel(reg, spi_imx->base + MXC_CSPICTRL);
453 }
454
455 static int __maybe_unused mx31_config(struct spi_imx_data *spi_imx,
456 struct spi_imx_config *config)
457 {
458 unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
459 int cs = spi_imx->chipselect[config->cs];
460
461 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
462 MX31_CSPICTRL_DR_SHIFT;
463
464 if (is_imx35_cspi(spi_imx)) {
465 reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
466 reg |= MX31_CSPICTRL_SSCTL;
467 } else {
468 reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
469 }
470
471 if (config->mode & SPI_CPHA)
472 reg |= MX31_CSPICTRL_PHA;
473 if (config->mode & SPI_CPOL)
474 reg |= MX31_CSPICTRL_POL;
475 if (config->mode & SPI_CS_HIGH)
476 reg |= MX31_CSPICTRL_SSPOL;
477 if (cs < 0)
478 reg |= (cs + 32) <<
479 (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
480 MX31_CSPICTRL_CS_SHIFT);
481
482 writel(reg, spi_imx->base + MXC_CSPICTRL);
483
484 return 0;
485 }
486
487 static int __maybe_unused mx31_rx_available(struct spi_imx_data *spi_imx)
488 {
489 return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
490 }
491
492 static void __maybe_unused mx31_reset(struct spi_imx_data *spi_imx)
493 {
494 /* drain receive buffer */
495 while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
496 readl(spi_imx->base + MXC_CSPIRXDATA);
497 }
498
499 #define MX21_INTREG_RR (1 << 4)
500 #define MX21_INTREG_TEEN (1 << 9)
501 #define MX21_INTREG_RREN (1 << 13)
502
503 #define MX21_CSPICTRL_POL (1 << 5)
504 #define MX21_CSPICTRL_PHA (1 << 6)
505 #define MX21_CSPICTRL_SSPOL (1 << 8)
506 #define MX21_CSPICTRL_XCH (1 << 9)
507 #define MX21_CSPICTRL_ENABLE (1 << 10)
508 #define MX21_CSPICTRL_MASTER (1 << 11)
509 #define MX21_CSPICTRL_DR_SHIFT 14
510 #define MX21_CSPICTRL_CS_SHIFT 19
511
512 static void __maybe_unused mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
513 {
514 unsigned int val = 0;
515
516 if (enable & MXC_INT_TE)
517 val |= MX21_INTREG_TEEN;
518 if (enable & MXC_INT_RR)
519 val |= MX21_INTREG_RREN;
520
521 writel(val, spi_imx->base + MXC_CSPIINT);
522 }
523
524 static void __maybe_unused mx21_trigger(struct spi_imx_data *spi_imx)
525 {
526 unsigned int reg;
527
528 reg = readl(spi_imx->base + MXC_CSPICTRL);
529 reg |= MX21_CSPICTRL_XCH;
530 writel(reg, spi_imx->base + MXC_CSPICTRL);
531 }
532
533 static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx,
534 struct spi_imx_config *config)
535 {
536 unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
537 int cs = spi_imx->chipselect[config->cs];
538 unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
539
540 reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
541 MX21_CSPICTRL_DR_SHIFT;
542 reg |= config->bpw - 1;
543
544 if (config->mode & SPI_CPHA)
545 reg |= MX21_CSPICTRL_PHA;
546 if (config->mode & SPI_CPOL)
547 reg |= MX21_CSPICTRL_POL;
548 if (config->mode & SPI_CS_HIGH)
549 reg |= MX21_CSPICTRL_SSPOL;
550 if (cs < 0)
551 reg |= (cs + 32) << MX21_CSPICTRL_CS_SHIFT;
552
553 writel(reg, spi_imx->base + MXC_CSPICTRL);
554
555 return 0;
556 }
557
558 static int __maybe_unused mx21_rx_available(struct spi_imx_data *spi_imx)
559 {
560 return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
561 }
562
563 static void __maybe_unused mx21_reset(struct spi_imx_data *spi_imx)
564 {
565 writel(1, spi_imx->base + MXC_RESET);
566 }
567
568 #define MX1_INTREG_RR (1 << 3)
569 #define MX1_INTREG_TEEN (1 << 8)
570 #define MX1_INTREG_RREN (1 << 11)
571
572 #define MX1_CSPICTRL_POL (1 << 4)
573 #define MX1_CSPICTRL_PHA (1 << 5)
574 #define MX1_CSPICTRL_XCH (1 << 8)
575 #define MX1_CSPICTRL_ENABLE (1 << 9)
576 #define MX1_CSPICTRL_MASTER (1 << 10)
577 #define MX1_CSPICTRL_DR_SHIFT 13
578
579 static void __maybe_unused mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
580 {
581 unsigned int val = 0;
582
583 if (enable & MXC_INT_TE)
584 val |= MX1_INTREG_TEEN;
585 if (enable & MXC_INT_RR)
586 val |= MX1_INTREG_RREN;
587
588 writel(val, spi_imx->base + MXC_CSPIINT);
589 }
590
591 static void __maybe_unused mx1_trigger(struct spi_imx_data *spi_imx)
592 {
593 unsigned int reg;
594
595 reg = readl(spi_imx->base + MXC_CSPICTRL);
596 reg |= MX1_CSPICTRL_XCH;
597 writel(reg, spi_imx->base + MXC_CSPICTRL);
598 }
599
600 static int __maybe_unused mx1_config(struct spi_imx_data *spi_imx,
601 struct spi_imx_config *config)
602 {
603 unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
604
605 reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
606 MX1_CSPICTRL_DR_SHIFT;
607 reg |= config->bpw - 1;
608
609 if (config->mode & SPI_CPHA)
610 reg |= MX1_CSPICTRL_PHA;
611 if (config->mode & SPI_CPOL)
612 reg |= MX1_CSPICTRL_POL;
613
614 writel(reg, spi_imx->base + MXC_CSPICTRL);
615
616 return 0;
617 }
618
619 static int __maybe_unused mx1_rx_available(struct spi_imx_data *spi_imx)
620 {
621 return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
622 }
623
624 static void __maybe_unused mx1_reset(struct spi_imx_data *spi_imx)
625 {
626 writel(1, spi_imx->base + MXC_RESET);
627 }
628
629 static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
630 .intctrl = mx1_intctrl,
631 .config = mx1_config,
632 .trigger = mx1_trigger,
633 .rx_available = mx1_rx_available,
634 .reset = mx1_reset,
635 .devtype = IMX1_CSPI,
636 };
637
638 static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
639 .intctrl = mx21_intctrl,
640 .config = mx21_config,
641 .trigger = mx21_trigger,
642 .rx_available = mx21_rx_available,
643 .reset = mx21_reset,
644 .devtype = IMX21_CSPI,
645 };
646
647 static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
648 /* i.mx27 cspi shares the functions with i.mx21 one */
649 .intctrl = mx21_intctrl,
650 .config = mx21_config,
651 .trigger = mx21_trigger,
652 .rx_available = mx21_rx_available,
653 .reset = mx21_reset,
654 .devtype = IMX27_CSPI,
655 };
656
657 static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
658 .intctrl = mx31_intctrl,
659 .config = mx31_config,
660 .trigger = mx31_trigger,
661 .rx_available = mx31_rx_available,
662 .reset = mx31_reset,
663 .devtype = IMX31_CSPI,
664 };
665
666 static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
667 /* i.mx35 and later cspi shares the functions with i.mx31 one */
668 .intctrl = mx31_intctrl,
669 .config = mx31_config,
670 .trigger = mx31_trigger,
671 .rx_available = mx31_rx_available,
672 .reset = mx31_reset,
673 .devtype = IMX35_CSPI,
674 };
675
676 static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
677 .intctrl = mx51_ecspi_intctrl,
678 .config = mx51_ecspi_config,
679 .trigger = mx51_ecspi_trigger,
680 .rx_available = mx51_ecspi_rx_available,
681 .reset = mx51_ecspi_reset,
682 .devtype = IMX51_ECSPI,
683 };
684
685 static const struct platform_device_id spi_imx_devtype[] = {
686 {
687 .name = "imx1-cspi",
688 .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
689 }, {
690 .name = "imx21-cspi",
691 .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
692 }, {
693 .name = "imx27-cspi",
694 .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
695 }, {
696 .name = "imx31-cspi",
697 .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
698 }, {
699 .name = "imx35-cspi",
700 .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
701 }, {
702 .name = "imx51-ecspi",
703 .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
704 }, {
705 /* sentinel */
706 }
707 };
708
709 static const struct of_device_id spi_imx_dt_ids[] = {
710 { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
711 { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
712 { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
713 { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
714 { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
715 { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
716 { /* sentinel */ }
717 };
718 MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
719
720 static void spi_imx_chipselect(struct spi_device *spi, int is_active)
721 {
722 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
723 int gpio = spi_imx->chipselect[spi->chip_select];
724 int active = is_active != BITBANG_CS_INACTIVE;
725 int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
726
727 if (!gpio_is_valid(gpio))
728 return;
729
730 gpio_set_value(gpio, dev_is_lowactive ^ active);
731 }
732
733 static void spi_imx_push(struct spi_imx_data *spi_imx)
734 {
735 while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) {
736 if (!spi_imx->count)
737 break;
738 spi_imx->tx(spi_imx);
739 spi_imx->txfifo++;
740 }
741
742 spi_imx->devtype_data->trigger(spi_imx);
743 }
744
745 static irqreturn_t spi_imx_isr(int irq, void *dev_id)
746 {
747 struct spi_imx_data *spi_imx = dev_id;
748
749 while (spi_imx->devtype_data->rx_available(spi_imx)) {
750 spi_imx->rx(spi_imx);
751 spi_imx->txfifo--;
752 }
753
754 if (spi_imx->count) {
755 spi_imx_push(spi_imx);
756 return IRQ_HANDLED;
757 }
758
759 if (spi_imx->txfifo) {
760 /* No data left to push, but still waiting for rx data,
761 * enable receive data available interrupt.
762 */
763 spi_imx->devtype_data->intctrl(
764 spi_imx, MXC_INT_RR);
765 return IRQ_HANDLED;
766 }
767
768 spi_imx->devtype_data->intctrl(spi_imx, 0);
769 complete(&spi_imx->xfer_done);
770
771 return IRQ_HANDLED;
772 }
773
774 static int spi_imx_setupxfer(struct spi_device *spi,
775 struct spi_transfer *t)
776 {
777 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
778 struct spi_imx_config config;
779
780 config.bpw = t ? t->bits_per_word : spi->bits_per_word;
781 config.speed_hz = t ? t->speed_hz : spi->max_speed_hz;
782 config.mode = spi->mode;
783 config.cs = spi->chip_select;
784
785 if (!config.speed_hz)
786 config.speed_hz = spi->max_speed_hz;
787 if (!config.bpw)
788 config.bpw = spi->bits_per_word;
789
790 /* Initialize the functions for transfer */
791 if (config.bpw <= 8) {
792 spi_imx->rx = spi_imx_buf_rx_u8;
793 spi_imx->tx = spi_imx_buf_tx_u8;
794 } else if (config.bpw <= 16) {
795 spi_imx->rx = spi_imx_buf_rx_u16;
796 spi_imx->tx = spi_imx_buf_tx_u16;
797 } else {
798 spi_imx->rx = spi_imx_buf_rx_u32;
799 spi_imx->tx = spi_imx_buf_tx_u32;
800 }
801
802 spi_imx->devtype_data->config(spi_imx, &config);
803
804 return 0;
805 }
806
807 static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
808 {
809 struct spi_master *master = spi_imx->bitbang.master;
810
811 if (master->dma_rx) {
812 dma_release_channel(master->dma_rx);
813 master->dma_rx = NULL;
814 }
815
816 if (master->dma_tx) {
817 dma_release_channel(master->dma_tx);
818 master->dma_tx = NULL;
819 }
820
821 spi_imx->dma_is_inited = 0;
822 }
823
824 static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
825 struct spi_master *master,
826 const struct resource *res)
827 {
828 struct dma_slave_config slave_config = {};
829 int ret;
830
831 /* use pio mode for i.mx6dl chip TKT238285 */
832 if (of_machine_is_compatible("fsl,imx6dl"))
833 return 0;
834
835 /* Prepare for TX DMA: */
836 master->dma_tx = dma_request_slave_channel(dev, "tx");
837 if (!master->dma_tx) {
838 dev_err(dev, "cannot get the TX DMA channel!\n");
839 ret = -EINVAL;
840 goto err;
841 }
842
843 slave_config.direction = DMA_MEM_TO_DEV;
844 slave_config.dst_addr = res->start + MXC_CSPITXDATA;
845 slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
846 slave_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) / 2;
847 ret = dmaengine_slave_config(master->dma_tx, &slave_config);
848 if (ret) {
849 dev_err(dev, "error in TX dma configuration.\n");
850 goto err;
851 }
852
853 /* Prepare for RX : */
854 master->dma_rx = dma_request_slave_channel(dev, "rx");
855 if (!master->dma_rx) {
856 dev_dbg(dev, "cannot get the DMA channel.\n");
857 ret = -EINVAL;
858 goto err;
859 }
860
861 slave_config.direction = DMA_DEV_TO_MEM;
862 slave_config.src_addr = res->start + MXC_CSPIRXDATA;
863 slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
864 slave_config.src_maxburst = spi_imx_get_fifosize(spi_imx) / 2;
865 ret = dmaengine_slave_config(master->dma_rx, &slave_config);
866 if (ret) {
867 dev_err(dev, "error in RX dma configuration.\n");
868 goto err;
869 }
870
871 init_completion(&spi_imx->dma_rx_completion);
872 init_completion(&spi_imx->dma_tx_completion);
873 master->can_dma = spi_imx_can_dma;
874 master->max_dma_len = MAX_SDMA_BD_BYTES;
875 spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
876 SPI_MASTER_MUST_TX;
877 spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2;
878 spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2;
879 spi_imx->dma_is_inited = 1;
880
881 return 0;
882 err:
883 spi_imx_sdma_exit(spi_imx);
884 return ret;
885 }
886
887 static void spi_imx_dma_rx_callback(void *cookie)
888 {
889 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
890
891 complete(&spi_imx->dma_rx_completion);
892 }
893
894 static void spi_imx_dma_tx_callback(void *cookie)
895 {
896 struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
897
898 complete(&spi_imx->dma_tx_completion);
899 }
900
901 static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
902 struct spi_transfer *transfer)
903 {
904 struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
905 int ret;
906 unsigned long timeout;
907 u32 dma;
908 int left;
909 struct spi_master *master = spi_imx->bitbang.master;
910 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
911
912 if (tx) {
913 desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
914 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
915 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
916 if (!desc_tx)
917 goto no_dma;
918
919 desc_tx->callback = spi_imx_dma_tx_callback;
920 desc_tx->callback_param = (void *)spi_imx;
921 dmaengine_submit(desc_tx);
922 }
923
924 if (rx) {
925 desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
926 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
927 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
928 if (!desc_rx)
929 goto no_dma;
930
931 desc_rx->callback = spi_imx_dma_rx_callback;
932 desc_rx->callback_param = (void *)spi_imx;
933 dmaengine_submit(desc_rx);
934 }
935
936 reinit_completion(&spi_imx->dma_rx_completion);
937 reinit_completion(&spi_imx->dma_tx_completion);
938
939 /* Trigger the cspi module. */
940 spi_imx->dma_finished = 0;
941
942 dma = readl(spi_imx->base + MX51_ECSPI_DMA);
943 dma = dma & (~MX51_ECSPI_DMA_RXT_WML_MASK);
944 /* Change RX_DMA_LENGTH trigger dma fetch tail data */
945 left = transfer->len % spi_imx->rxt_wml;
946 if (left)
947 writel(dma | (left << MX51_ECSPI_DMA_RXT_WML_OFFSET),
948 spi_imx->base + MX51_ECSPI_DMA);
949 spi_imx->devtype_data->trigger(spi_imx);
950
951 dma_async_issue_pending(master->dma_tx);
952 dma_async_issue_pending(master->dma_rx);
953 /* Wait SDMA to finish the data transfer.*/
954 timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
955 IMX_DMA_TIMEOUT);
956 if (!timeout) {
957 pr_warn("%s %s: I/O Error in DMA TX\n",
958 dev_driver_string(&master->dev),
959 dev_name(&master->dev));
960 dmaengine_terminate_all(master->dma_tx);
961 } else {
962 timeout = wait_for_completion_timeout(
963 &spi_imx->dma_rx_completion, IMX_DMA_TIMEOUT);
964 if (!timeout) {
965 pr_warn("%s %s: I/O Error in DMA RX\n",
966 dev_driver_string(&master->dev),
967 dev_name(&master->dev));
968 spi_imx->devtype_data->reset(spi_imx);
969 dmaengine_terminate_all(master->dma_rx);
970 }
971 writel(dma |
972 spi_imx->rxt_wml << MX51_ECSPI_DMA_RXT_WML_OFFSET,
973 spi_imx->base + MX51_ECSPI_DMA);
974 }
975
976 spi_imx->dma_finished = 1;
977 spi_imx->devtype_data->trigger(spi_imx);
978
979 if (!timeout)
980 ret = -ETIMEDOUT;
981 else
982 ret = transfer->len;
983
984 return ret;
985
986 no_dma:
987 pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
988 dev_driver_string(&master->dev),
989 dev_name(&master->dev));
990 return -EAGAIN;
991 }
992
993 static int spi_imx_pio_transfer(struct spi_device *spi,
994 struct spi_transfer *transfer)
995 {
996 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
997
998 spi_imx->tx_buf = transfer->tx_buf;
999 spi_imx->rx_buf = transfer->rx_buf;
1000 spi_imx->count = transfer->len;
1001 spi_imx->txfifo = 0;
1002
1003 reinit_completion(&spi_imx->xfer_done);
1004
1005 spi_imx_push(spi_imx);
1006
1007 spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
1008
1009 wait_for_completion(&spi_imx->xfer_done);
1010
1011 return transfer->len;
1012 }
1013
1014 static int spi_imx_transfer(struct spi_device *spi,
1015 struct spi_transfer *transfer)
1016 {
1017 int ret;
1018 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1019
1020 if (spi_imx->bitbang.master->can_dma &&
1021 spi_imx_can_dma(spi_imx->bitbang.master, spi, transfer)) {
1022 spi_imx->usedma = true;
1023 ret = spi_imx_dma_transfer(spi_imx, transfer);
1024 if (ret != -EAGAIN)
1025 return ret;
1026 }
1027 spi_imx->usedma = false;
1028
1029 return spi_imx_pio_transfer(spi, transfer);
1030 }
1031
1032 static int spi_imx_setup(struct spi_device *spi)
1033 {
1034 struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
1035 int gpio = spi_imx->chipselect[spi->chip_select];
1036
1037 dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
1038 spi->mode, spi->bits_per_word, spi->max_speed_hz);
1039
1040 if (gpio_is_valid(gpio))
1041 gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
1042
1043 spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);
1044
1045 return 0;
1046 }
1047
1048 static void spi_imx_cleanup(struct spi_device *spi)
1049 {
1050 }
1051
1052 static int
1053 spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
1054 {
1055 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1056 int ret;
1057
1058 ret = clk_enable(spi_imx->clk_per);
1059 if (ret)
1060 return ret;
1061
1062 ret = clk_enable(spi_imx->clk_ipg);
1063 if (ret) {
1064 clk_disable(spi_imx->clk_per);
1065 return ret;
1066 }
1067
1068 return 0;
1069 }
1070
1071 static int
1072 spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
1073 {
1074 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1075
1076 clk_disable(spi_imx->clk_ipg);
1077 clk_disable(spi_imx->clk_per);
1078 return 0;
1079 }
1080
1081 static int spi_imx_probe(struct platform_device *pdev)
1082 {
1083 struct device_node *np = pdev->dev.of_node;
1084 const struct of_device_id *of_id =
1085 of_match_device(spi_imx_dt_ids, &pdev->dev);
1086 struct spi_imx_master *mxc_platform_info =
1087 dev_get_platdata(&pdev->dev);
1088 struct spi_master *master;
1089 struct spi_imx_data *spi_imx;
1090 struct resource *res;
1091 int i, ret, num_cs, irq;
1092
1093 if (!np && !mxc_platform_info) {
1094 dev_err(&pdev->dev, "can't get the platform data\n");
1095 return -EINVAL;
1096 }
1097
1098 ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
1099 if (ret < 0) {
1100 if (mxc_platform_info)
1101 num_cs = mxc_platform_info->num_chipselect;
1102 else
1103 return ret;
1104 }
1105
1106 master = spi_alloc_master(&pdev->dev,
1107 sizeof(struct spi_imx_data) + sizeof(int) * num_cs);
1108 if (!master)
1109 return -ENOMEM;
1110
1111 platform_set_drvdata(pdev, master);
1112
1113 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
1114 master->bus_num = pdev->id;
1115 master->num_chipselect = num_cs;
1116
1117 spi_imx = spi_master_get_devdata(master);
1118 spi_imx->bitbang.master = master;
1119
1120 for (i = 0; i < master->num_chipselect; i++) {
1121 int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
1122 if (!gpio_is_valid(cs_gpio) && mxc_platform_info)
1123 cs_gpio = mxc_platform_info->chipselect[i];
1124
1125 spi_imx->chipselect[i] = cs_gpio;
1126 if (!gpio_is_valid(cs_gpio))
1127 continue;
1128
1129 ret = devm_gpio_request(&pdev->dev, spi_imx->chipselect[i],
1130 DRIVER_NAME);
1131 if (ret) {
1132 dev_err(&pdev->dev, "can't get cs gpios\n");
1133 goto out_master_put;
1134 }
1135 }
1136
1137 spi_imx->bitbang.chipselect = spi_imx_chipselect;
1138 spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
1139 spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
1140 spi_imx->bitbang.master->setup = spi_imx_setup;
1141 spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
1142 spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
1143 spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
1144 spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1145
1146 init_completion(&spi_imx->xfer_done);
1147
1148 spi_imx->devtype_data = of_id ? of_id->data :
1149 (struct spi_imx_devtype_data *) pdev->id_entry->driver_data;
1150
1151 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1152 spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
1153 if (IS_ERR(spi_imx->base)) {
1154 ret = PTR_ERR(spi_imx->base);
1155 goto out_master_put;
1156 }
1157
1158 irq = platform_get_irq(pdev, 0);
1159 if (irq < 0) {
1160 ret = irq;
1161 goto out_master_put;
1162 }
1163
1164 ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
1165 dev_name(&pdev->dev), spi_imx);
1166 if (ret) {
1167 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
1168 goto out_master_put;
1169 }
1170
1171 spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1172 if (IS_ERR(spi_imx->clk_ipg)) {
1173 ret = PTR_ERR(spi_imx->clk_ipg);
1174 goto out_master_put;
1175 }
1176
1177 spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
1178 if (IS_ERR(spi_imx->clk_per)) {
1179 ret = PTR_ERR(spi_imx->clk_per);
1180 goto out_master_put;
1181 }
1182
1183 ret = clk_prepare_enable(spi_imx->clk_per);
1184 if (ret)
1185 goto out_master_put;
1186
1187 ret = clk_prepare_enable(spi_imx->clk_ipg);
1188 if (ret)
1189 goto out_put_per;
1190
1191 spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
1192 /*
1193 * Only validated on i.mx6 now, can remove the constrain if validated on
1194 * other chips.
1195 */
1196 if (spi_imx->devtype_data == &imx51_ecspi_devtype_data
1197 && spi_imx_sdma_init(&pdev->dev, spi_imx, master, res))
1198 dev_err(&pdev->dev, "dma setup error,use pio instead\n");
1199
1200 spi_imx->devtype_data->reset(spi_imx);
1201
1202 spi_imx->devtype_data->intctrl(spi_imx, 0);
1203
1204 master->dev.of_node = pdev->dev.of_node;
1205 ret = spi_bitbang_start(&spi_imx->bitbang);
1206 if (ret) {
1207 dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
1208 goto out_clk_put;
1209 }
1210
1211 dev_info(&pdev->dev, "probed\n");
1212
1213 clk_disable(spi_imx->clk_ipg);
1214 clk_disable(spi_imx->clk_per);
1215 return ret;
1216
1217 out_clk_put:
1218 clk_disable_unprepare(spi_imx->clk_ipg);
1219 out_put_per:
1220 clk_disable_unprepare(spi_imx->clk_per);
1221 out_master_put:
1222 spi_master_put(master);
1223
1224 return ret;
1225 }
1226
1227 static int spi_imx_remove(struct platform_device *pdev)
1228 {
1229 struct spi_master *master = platform_get_drvdata(pdev);
1230 struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
1231
1232 spi_bitbang_stop(&spi_imx->bitbang);
1233
1234 writel(0, spi_imx->base + MXC_CSPICTRL);
1235 clk_unprepare(spi_imx->clk_ipg);
1236 clk_unprepare(spi_imx->clk_per);
1237 spi_imx_sdma_exit(spi_imx);
1238 spi_master_put(master);
1239
1240 return 0;
1241 }
1242
1243 static struct platform_driver spi_imx_driver = {
1244 .driver = {
1245 .name = DRIVER_NAME,
1246 .of_match_table = spi_imx_dt_ids,
1247 },
1248 .id_table = spi_imx_devtype,
1249 .probe = spi_imx_probe,
1250 .remove = spi_imx_remove,
1251 };
1252 module_platform_driver(spi_imx_driver);
1253
1254 MODULE_DESCRIPTION("SPI Master Controller driver");
1255 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1256 MODULE_LICENSE("GPL");
1257 MODULE_ALIAS("platform:" DRIVER_NAME);
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