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35c9049b CM |
1 | /* |
2 | * OMAP7xx SPI 100k controller driver | |
3 | * Author: Fabrice Crohas <fcrohas@gmail.com> | |
4 | * from original omap1_mcspi driver | |
5 | * | |
6 | * Copyright (C) 2005, 2006 Nokia Corporation | |
7 | * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and | |
8 | * Juha Yrj�l� <juha.yrjola@nokia.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | */ | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/clk.h> | |
34 | #include <linux/io.h> | |
35 | #include <linux/gpio.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
35c9049b CM |
37 | |
38 | #include <linux/spi/spi.h> | |
39 | ||
40 | #include <plat/clock.h> | |
41 | ||
42 | #define OMAP1_SPI100K_MAX_FREQ 48000000 | |
43 | ||
44 | #define ICR_SPITAS (OMAP7XX_ICR_BASE + 0x12) | |
45 | ||
46 | #define SPI_SETUP1 0x00 | |
47 | #define SPI_SETUP2 0x02 | |
48 | #define SPI_CTRL 0x04 | |
49 | #define SPI_STATUS 0x06 | |
50 | #define SPI_TX_LSB 0x08 | |
51 | #define SPI_TX_MSB 0x0a | |
52 | #define SPI_RX_LSB 0x0c | |
53 | #define SPI_RX_MSB 0x0e | |
54 | ||
55 | #define SPI_SETUP1_INT_READ_ENABLE (1UL << 5) | |
56 | #define SPI_SETUP1_INT_WRITE_ENABLE (1UL << 4) | |
57 | #define SPI_SETUP1_CLOCK_DIVISOR(x) ((x) << 1) | |
58 | #define SPI_SETUP1_CLOCK_ENABLE (1UL << 0) | |
59 | ||
60 | #define SPI_SETUP2_ACTIVE_EDGE_FALLING (0UL << 0) | |
61 | #define SPI_SETUP2_ACTIVE_EDGE_RISING (1UL << 0) | |
62 | #define SPI_SETUP2_NEGATIVE_LEVEL (0UL << 5) | |
63 | #define SPI_SETUP2_POSITIVE_LEVEL (1UL << 5) | |
64 | #define SPI_SETUP2_LEVEL_TRIGGER (0UL << 10) | |
65 | #define SPI_SETUP2_EDGE_TRIGGER (1UL << 10) | |
66 | ||
67 | #define SPI_CTRL_SEN(x) ((x) << 7) | |
68 | #define SPI_CTRL_WORD_SIZE(x) (((x) - 1) << 2) | |
69 | #define SPI_CTRL_WR (1UL << 1) | |
70 | #define SPI_CTRL_RD (1UL << 0) | |
71 | ||
72 | #define SPI_STATUS_WE (1UL << 1) | |
73 | #define SPI_STATUS_RD (1UL << 0) | |
74 | ||
75 | #define WRITE 0 | |
76 | #define READ 1 | |
77 | ||
78 | ||
79 | /* use PIO for small transfers, avoiding DMA setup/teardown overhead and | |
80 | * cache operations; better heuristics consider wordsize and bitrate. | |
81 | */ | |
82 | #define DMA_MIN_BYTES 8 | |
83 | ||
84 | #define SPI_RUNNING 0 | |
85 | #define SPI_SHUTDOWN 1 | |
86 | ||
87 | struct omap1_spi100k { | |
88 | struct work_struct work; | |
89 | ||
90 | /* lock protects queue and registers */ | |
91 | spinlock_t lock; | |
92 | struct list_head msg_queue; | |
93 | struct spi_master *master; | |
94 | struct clk *ick; | |
95 | struct clk *fck; | |
96 | ||
97 | /* Virtual base address of the controller */ | |
98 | void __iomem *base; | |
99 | ||
100 | /* State of the SPI */ | |
101 | unsigned int state; | |
102 | }; | |
103 | ||
104 | struct omap1_spi100k_cs { | |
105 | void __iomem *base; | |
106 | int word_len; | |
107 | }; | |
108 | ||
109 | static struct workqueue_struct *omap1_spi100k_wq; | |
110 | ||
111 | #define MOD_REG_BIT(val, mask, set) do { \ | |
112 | if (set) \ | |
113 | val |= mask; \ | |
114 | else \ | |
115 | val &= ~mask; \ | |
116 | } while (0) | |
117 | ||
118 | static void spi100k_enable_clock(struct spi_master *master) | |
119 | { | |
120 | unsigned int val; | |
121 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
122 | ||
123 | /* enable SPI */ | |
124 | val = readw(spi100k->base + SPI_SETUP1); | |
125 | val |= SPI_SETUP1_CLOCK_ENABLE; | |
126 | writew(val, spi100k->base + SPI_SETUP1); | |
127 | } | |
128 | ||
129 | static void spi100k_disable_clock(struct spi_master *master) | |
130 | { | |
131 | unsigned int val; | |
132 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
133 | ||
134 | /* disable SPI */ | |
135 | val = readw(spi100k->base + SPI_SETUP1); | |
136 | val &= ~SPI_SETUP1_CLOCK_ENABLE; | |
137 | writew(val, spi100k->base + SPI_SETUP1); | |
138 | } | |
139 | ||
140 | static void spi100k_write_data(struct spi_master *master, int len, int data) | |
141 | { | |
142 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
143 | ||
5c2818cd CM |
144 | /* write 16-bit word, shifting 8-bit data if necessary */ |
145 | if (len <= 8) { | |
146 | data <<= 8; | |
147 | len = 16; | |
148 | } | |
149 | ||
35c9049b CM |
150 | spi100k_enable_clock(master); |
151 | writew( data , spi100k->base + SPI_TX_MSB); | |
152 | ||
153 | writew(SPI_CTRL_SEN(0) | | |
154 | SPI_CTRL_WORD_SIZE(len) | | |
155 | SPI_CTRL_WR, | |
156 | spi100k->base + SPI_CTRL); | |
157 | ||
158 | /* Wait for bit ack send change */ | |
159 | while((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_WE) != SPI_STATUS_WE); | |
160 | udelay(1000); | |
161 | ||
162 | spi100k_disable_clock(master); | |
163 | } | |
164 | ||
165 | static int spi100k_read_data(struct spi_master *master, int len) | |
166 | { | |
167 | int dataH,dataL; | |
168 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
169 | ||
5c2818cd CM |
170 | /* Always do at least 16 bits */ |
171 | if (len <= 8) | |
172 | len = 16; | |
173 | ||
35c9049b CM |
174 | spi100k_enable_clock(master); |
175 | writew(SPI_CTRL_SEN(0) | | |
176 | SPI_CTRL_WORD_SIZE(len) | | |
177 | SPI_CTRL_RD, | |
178 | spi100k->base + SPI_CTRL); | |
179 | ||
180 | while((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_RD) != SPI_STATUS_RD); | |
181 | udelay(1000); | |
182 | ||
183 | dataL = readw(spi100k->base + SPI_RX_LSB); | |
184 | dataH = readw(spi100k->base + SPI_RX_MSB); | |
185 | spi100k_disable_clock(master); | |
186 | ||
187 | return dataL; | |
188 | } | |
189 | ||
190 | static void spi100k_open(struct spi_master *master) | |
191 | { | |
192 | /* get control of SPI */ | |
193 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
194 | ||
195 | writew(SPI_SETUP1_INT_READ_ENABLE | | |
196 | SPI_SETUP1_INT_WRITE_ENABLE | | |
197 | SPI_SETUP1_CLOCK_DIVISOR(0), spi100k->base + SPI_SETUP1); | |
198 | ||
199 | /* configure clock and interrupts */ | |
200 | writew(SPI_SETUP2_ACTIVE_EDGE_FALLING | | |
201 | SPI_SETUP2_NEGATIVE_LEVEL | | |
202 | SPI_SETUP2_LEVEL_TRIGGER, spi100k->base + SPI_SETUP2); | |
203 | } | |
204 | ||
205 | static void omap1_spi100k_force_cs(struct omap1_spi100k *spi100k, int enable) | |
206 | { | |
207 | if (enable) | |
208 | writew(0x05fc, spi100k->base + SPI_CTRL); | |
209 | else | |
210 | writew(0x05fd, spi100k->base + SPI_CTRL); | |
211 | } | |
212 | ||
213 | static unsigned | |
214 | omap1_spi100k_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) | |
215 | { | |
216 | struct omap1_spi100k *spi100k; | |
217 | struct omap1_spi100k_cs *cs = spi->controller_state; | |
218 | unsigned int count, c; | |
219 | int word_len; | |
220 | ||
221 | spi100k = spi_master_get_devdata(spi->master); | |
222 | count = xfer->len; | |
223 | c = count; | |
224 | word_len = cs->word_len; | |
225 | ||
35c9049b CM |
226 | if (word_len <= 8) { |
227 | u8 *rx; | |
228 | const u8 *tx; | |
229 | ||
230 | rx = xfer->rx_buf; | |
231 | tx = xfer->tx_buf; | |
232 | do { | |
233 | c-=1; | |
234 | if (xfer->tx_buf != NULL) | |
5c2818cd | 235 | spi100k_write_data(spi->master, word_len, *tx++); |
35c9049b | 236 | if (xfer->rx_buf != NULL) |
5c2818cd | 237 | *rx++ = spi100k_read_data(spi->master, word_len); |
35c9049b CM |
238 | } while(c); |
239 | } else if (word_len <= 16) { | |
240 | u16 *rx; | |
241 | const u16 *tx; | |
242 | ||
243 | rx = xfer->rx_buf; | |
244 | tx = xfer->tx_buf; | |
245 | do { | |
246 | c-=2; | |
247 | if (xfer->tx_buf != NULL) | |
248 | spi100k_write_data(spi->master,word_len, *tx++); | |
249 | if (xfer->rx_buf != NULL) | |
250 | *rx++ = spi100k_read_data(spi->master,word_len); | |
251 | } while(c); | |
252 | } else if (word_len <= 32) { | |
253 | u32 *rx; | |
254 | const u32 *tx; | |
255 | ||
256 | rx = xfer->rx_buf; | |
257 | tx = xfer->tx_buf; | |
258 | do { | |
259 | c-=4; | |
260 | if (xfer->tx_buf != NULL) | |
261 | spi100k_write_data(spi->master,word_len, *tx); | |
262 | if (xfer->rx_buf != NULL) | |
263 | *rx = spi100k_read_data(spi->master,word_len); | |
264 | } while(c); | |
265 | } | |
266 | return count - c; | |
267 | } | |
268 | ||
269 | /* called only when no transfer is active to this device */ | |
270 | static int omap1_spi100k_setup_transfer(struct spi_device *spi, | |
271 | struct spi_transfer *t) | |
272 | { | |
273 | struct omap1_spi100k *spi100k = spi_master_get_devdata(spi->master); | |
274 | struct omap1_spi100k_cs *cs = spi->controller_state; | |
275 | u8 word_len = spi->bits_per_word; | |
276 | ||
277 | if (t != NULL && t->bits_per_word) | |
278 | word_len = t->bits_per_word; | |
279 | if (!word_len) | |
280 | word_len = 8; | |
281 | ||
282 | if (spi->bits_per_word > 32) | |
283 | return -EINVAL; | |
284 | cs->word_len = word_len; | |
285 | ||
286 | /* SPI init before transfer */ | |
287 | writew(0x3e , spi100k->base + SPI_SETUP1); | |
288 | writew(0x00 , spi100k->base + SPI_STATUS); | |
289 | writew(0x3e , spi100k->base + SPI_CTRL); | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | /* the spi->mode bits understood by this driver: */ | |
295 | #define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) | |
296 | ||
297 | static int omap1_spi100k_setup(struct spi_device *spi) | |
298 | { | |
299 | int ret; | |
300 | struct omap1_spi100k *spi100k; | |
301 | struct omap1_spi100k_cs *cs = spi->controller_state; | |
302 | ||
303 | if (spi->bits_per_word < 4 || spi->bits_per_word > 32) { | |
304 | dev_dbg(&spi->dev, "setup: unsupported %d bit words\n", | |
305 | spi->bits_per_word); | |
306 | return -EINVAL; | |
307 | } | |
308 | ||
309 | spi100k = spi_master_get_devdata(spi->master); | |
310 | ||
311 | if (!cs) { | |
312 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
313 | if (!cs) | |
314 | return -ENOMEM; | |
315 | cs->base = spi100k->base + spi->chip_select * 0x14; | |
316 | spi->controller_state = cs; | |
317 | } | |
318 | ||
319 | spi100k_open(spi->master); | |
320 | ||
321 | clk_enable(spi100k->ick); | |
322 | clk_enable(spi100k->fck); | |
323 | ||
324 | ret = omap1_spi100k_setup_transfer(spi, NULL); | |
325 | ||
326 | clk_disable(spi100k->ick); | |
327 | clk_disable(spi100k->fck); | |
328 | ||
329 | return ret; | |
330 | } | |
331 | ||
332 | static void omap1_spi100k_work(struct work_struct *work) | |
333 | { | |
334 | struct omap1_spi100k *spi100k; | |
335 | int status = 0; | |
336 | ||
337 | spi100k = container_of(work, struct omap1_spi100k, work); | |
338 | spin_lock_irq(&spi100k->lock); | |
339 | ||
340 | clk_enable(spi100k->ick); | |
341 | clk_enable(spi100k->fck); | |
342 | ||
343 | /* We only enable one channel at a time -- the one whose message is | |
344 | * at the head of the queue -- although this controller would gladly | |
345 | * arbitrate among multiple channels. This corresponds to "single | |
346 | * channel" master mode. As a side effect, we need to manage the | |
347 | * chipselect with the FORCE bit ... CS != channel enable. | |
348 | */ | |
349 | while (!list_empty(&spi100k->msg_queue)) { | |
350 | struct spi_message *m; | |
351 | struct spi_device *spi; | |
352 | struct spi_transfer *t = NULL; | |
353 | int cs_active = 0; | |
354 | struct omap1_spi100k_cs *cs; | |
355 | int par_override = 0; | |
356 | ||
357 | m = container_of(spi100k->msg_queue.next, struct spi_message, | |
358 | queue); | |
359 | ||
360 | list_del_init(&m->queue); | |
361 | spin_unlock_irq(&spi100k->lock); | |
362 | ||
363 | spi = m->spi; | |
364 | cs = spi->controller_state; | |
365 | ||
366 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
367 | if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { | |
368 | status = -EINVAL; | |
369 | break; | |
370 | } | |
371 | if (par_override || t->speed_hz || t->bits_per_word) { | |
372 | par_override = 1; | |
373 | status = omap1_spi100k_setup_transfer(spi, t); | |
374 | if (status < 0) | |
375 | break; | |
376 | if (!t->speed_hz && !t->bits_per_word) | |
377 | par_override = 0; | |
378 | } | |
379 | ||
380 | if (!cs_active) { | |
381 | omap1_spi100k_force_cs(spi100k, 1); | |
382 | cs_active = 1; | |
383 | } | |
384 | ||
385 | if (t->len) { | |
386 | unsigned count; | |
387 | ||
35c9049b CM |
388 | count = omap1_spi100k_txrx_pio(spi, t); |
389 | m->actual_length += count; | |
390 | ||
391 | if (count != t->len) { | |
392 | status = -EIO; | |
393 | break; | |
394 | } | |
395 | } | |
396 | ||
397 | if (t->delay_usecs) | |
398 | udelay(t->delay_usecs); | |
399 | ||
400 | /* ignore the "leave it on after last xfer" hint */ | |
401 | ||
402 | if (t->cs_change) { | |
403 | omap1_spi100k_force_cs(spi100k, 0); | |
404 | cs_active = 0; | |
405 | } | |
406 | } | |
407 | ||
408 | /* Restore defaults if they were overriden */ | |
409 | if (par_override) { | |
410 | par_override = 0; | |
411 | status = omap1_spi100k_setup_transfer(spi, NULL); | |
412 | } | |
413 | ||
414 | if (cs_active) | |
415 | omap1_spi100k_force_cs(spi100k, 0); | |
416 | ||
417 | m->status = status; | |
418 | m->complete(m->context); | |
419 | ||
420 | spin_lock_irq(&spi100k->lock); | |
421 | } | |
422 | ||
423 | clk_disable(spi100k->ick); | |
424 | clk_disable(spi100k->fck); | |
425 | spin_unlock_irq(&spi100k->lock); | |
426 | ||
427 | if (status < 0) | |
428 | printk(KERN_WARNING "spi transfer failed with %d\n", status); | |
429 | } | |
430 | ||
431 | static int omap1_spi100k_transfer(struct spi_device *spi, struct spi_message *m) | |
432 | { | |
433 | struct omap1_spi100k *spi100k; | |
434 | unsigned long flags; | |
435 | struct spi_transfer *t; | |
436 | ||
437 | m->actual_length = 0; | |
438 | m->status = -EINPROGRESS; | |
439 | ||
440 | spi100k = spi_master_get_devdata(spi->master); | |
441 | ||
442 | /* Don't accept new work if we're shutting down */ | |
443 | if (spi100k->state == SPI_SHUTDOWN) | |
444 | return -ESHUTDOWN; | |
445 | ||
446 | /* reject invalid messages and transfers */ | |
447 | if (list_empty(&m->transfers) || !m->complete) | |
448 | return -EINVAL; | |
449 | ||
450 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
451 | const void *tx_buf = t->tx_buf; | |
452 | void *rx_buf = t->rx_buf; | |
453 | unsigned len = t->len; | |
454 | ||
455 | if (t->speed_hz > OMAP1_SPI100K_MAX_FREQ | |
456 | || (len && !(rx_buf || tx_buf)) | |
457 | || (t->bits_per_word && | |
458 | ( t->bits_per_word < 4 | |
459 | || t->bits_per_word > 32))) { | |
460 | dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n", | |
461 | t->speed_hz, | |
462 | len, | |
463 | tx_buf ? "tx" : "", | |
464 | rx_buf ? "rx" : "", | |
465 | t->bits_per_word); | |
466 | return -EINVAL; | |
467 | } | |
468 | ||
469 | if (t->speed_hz && t->speed_hz < OMAP1_SPI100K_MAX_FREQ/(1<<16)) { | |
470 | dev_dbg(&spi->dev, "%d Hz max exceeds %d\n", | |
471 | t->speed_hz, | |
472 | OMAP1_SPI100K_MAX_FREQ/(1<<16)); | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | } | |
477 | ||
478 | spin_lock_irqsave(&spi100k->lock, flags); | |
479 | list_add_tail(&m->queue, &spi100k->msg_queue); | |
480 | queue_work(omap1_spi100k_wq, &spi100k->work); | |
481 | spin_unlock_irqrestore(&spi100k->lock, flags); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | static int __init omap1_spi100k_reset(struct omap1_spi100k *spi100k) | |
487 | { | |
488 | return 0; | |
489 | } | |
490 | ||
491 | static int __devinit omap1_spi100k_probe(struct platform_device *pdev) | |
492 | { | |
493 | struct spi_master *master; | |
494 | struct omap1_spi100k *spi100k; | |
495 | int status = 0; | |
496 | ||
497 | if (!pdev->id) | |
498 | return -EINVAL; | |
499 | ||
500 | master = spi_alloc_master(&pdev->dev, sizeof *spi100k); | |
501 | if (master == NULL) { | |
502 | dev_dbg(&pdev->dev, "master allocation failed\n"); | |
503 | return -ENOMEM; | |
504 | } | |
505 | ||
506 | if (pdev->id != -1) | |
507 | master->bus_num = pdev->id; | |
508 | ||
509 | master->setup = omap1_spi100k_setup; | |
510 | master->transfer = omap1_spi100k_transfer; | |
511 | master->cleanup = NULL; | |
512 | master->num_chipselect = 2; | |
513 | master->mode_bits = MODEBITS; | |
514 | ||
515 | dev_set_drvdata(&pdev->dev, master); | |
516 | ||
517 | spi100k = spi_master_get_devdata(master); | |
518 | spi100k->master = master; | |
519 | ||
520 | /* | |
521 | * The memory region base address is taken as the platform_data. | |
522 | * You should allocate this with ioremap() before initializing | |
523 | * the SPI. | |
524 | */ | |
525 | spi100k->base = (void __iomem *) pdev->dev.platform_data; | |
526 | ||
527 | INIT_WORK(&spi100k->work, omap1_spi100k_work); | |
528 | ||
529 | spin_lock_init(&spi100k->lock); | |
530 | INIT_LIST_HEAD(&spi100k->msg_queue); | |
531 | spi100k->ick = clk_get(&pdev->dev, "ick"); | |
532 | if (IS_ERR(spi100k->ick)) { | |
533 | dev_dbg(&pdev->dev, "can't get spi100k_ick\n"); | |
534 | status = PTR_ERR(spi100k->ick); | |
535 | goto err1; | |
536 | } | |
537 | ||
538 | spi100k->fck = clk_get(&pdev->dev, "fck"); | |
539 | if (IS_ERR(spi100k->fck)) { | |
540 | dev_dbg(&pdev->dev, "can't get spi100k_fck\n"); | |
541 | status = PTR_ERR(spi100k->fck); | |
542 | goto err2; | |
543 | } | |
544 | ||
545 | if (omap1_spi100k_reset(spi100k) < 0) | |
546 | goto err3; | |
547 | ||
548 | status = spi_register_master(master); | |
549 | if (status < 0) | |
550 | goto err3; | |
551 | ||
552 | spi100k->state = SPI_RUNNING; | |
553 | ||
554 | return status; | |
555 | ||
556 | err3: | |
557 | clk_put(spi100k->fck); | |
558 | err2: | |
559 | clk_put(spi100k->ick); | |
560 | err1: | |
561 | spi_master_put(master); | |
562 | return status; | |
563 | } | |
564 | ||
565 | static int __exit omap1_spi100k_remove(struct platform_device *pdev) | |
566 | { | |
567 | struct spi_master *master; | |
568 | struct omap1_spi100k *spi100k; | |
569 | struct resource *r; | |
570 | unsigned limit = 500; | |
571 | unsigned long flags; | |
572 | int status = 0; | |
573 | ||
574 | master = dev_get_drvdata(&pdev->dev); | |
575 | spi100k = spi_master_get_devdata(master); | |
576 | ||
577 | spin_lock_irqsave(&spi100k->lock, flags); | |
578 | ||
579 | spi100k->state = SPI_SHUTDOWN; | |
580 | while (!list_empty(&spi100k->msg_queue) && limit--) { | |
581 | spin_unlock_irqrestore(&spi100k->lock, flags); | |
582 | msleep(10); | |
583 | spin_lock_irqsave(&spi100k->lock, flags); | |
584 | } | |
585 | ||
586 | if (!list_empty(&spi100k->msg_queue)) | |
587 | status = -EBUSY; | |
588 | ||
589 | spin_unlock_irqrestore(&spi100k->lock, flags); | |
590 | ||
591 | if (status != 0) | |
592 | return status; | |
593 | ||
594 | clk_put(spi100k->fck); | |
595 | clk_put(spi100k->ick); | |
596 | ||
597 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
598 | ||
599 | spi_unregister_master(master); | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | static struct platform_driver omap1_spi100k_driver = { | |
605 | .driver = { | |
606 | .name = "omap1_spi100k", | |
607 | .owner = THIS_MODULE, | |
608 | }, | |
609 | .remove = __exit_p(omap1_spi100k_remove), | |
610 | }; | |
611 | ||
612 | ||
613 | static int __init omap1_spi100k_init(void) | |
614 | { | |
615 | omap1_spi100k_wq = create_singlethread_workqueue( | |
616 | omap1_spi100k_driver.driver.name); | |
617 | ||
618 | if (omap1_spi100k_wq == NULL) | |
619 | return -1; | |
620 | ||
621 | return platform_driver_probe(&omap1_spi100k_driver, omap1_spi100k_probe); | |
622 | } | |
623 | ||
624 | static void __exit omap1_spi100k_exit(void) | |
625 | { | |
626 | platform_driver_unregister(&omap1_spi100k_driver); | |
627 | ||
628 | destroy_workqueue(omap1_spi100k_wq); | |
629 | } | |
630 | ||
631 | module_init(omap1_spi100k_init); | |
632 | module_exit(omap1_spi100k_exit); | |
633 | ||
634 | MODULE_DESCRIPTION("OMAP7xx SPI 100k controller driver"); | |
635 | MODULE_AUTHOR("Fabrice Crohas <fcrohas@gmail.com>"); | |
636 | MODULE_LICENSE("GPL"); | |
637 |