Commit | Line | Data |
---|---|---|
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 | ||
35c9049b CM |
40 | #define OMAP1_SPI100K_MAX_FREQ 48000000 |
41 | ||
42 | #define ICR_SPITAS (OMAP7XX_ICR_BASE + 0x12) | |
43 | ||
44 | #define SPI_SETUP1 0x00 | |
45 | #define SPI_SETUP2 0x02 | |
46 | #define SPI_CTRL 0x04 | |
47 | #define SPI_STATUS 0x06 | |
48 | #define SPI_TX_LSB 0x08 | |
49 | #define SPI_TX_MSB 0x0a | |
50 | #define SPI_RX_LSB 0x0c | |
51 | #define SPI_RX_MSB 0x0e | |
52 | ||
53 | #define SPI_SETUP1_INT_READ_ENABLE (1UL << 5) | |
54 | #define SPI_SETUP1_INT_WRITE_ENABLE (1UL << 4) | |
55 | #define SPI_SETUP1_CLOCK_DIVISOR(x) ((x) << 1) | |
56 | #define SPI_SETUP1_CLOCK_ENABLE (1UL << 0) | |
57 | ||
58 | #define SPI_SETUP2_ACTIVE_EDGE_FALLING (0UL << 0) | |
59 | #define SPI_SETUP2_ACTIVE_EDGE_RISING (1UL << 0) | |
60 | #define SPI_SETUP2_NEGATIVE_LEVEL (0UL << 5) | |
61 | #define SPI_SETUP2_POSITIVE_LEVEL (1UL << 5) | |
62 | #define SPI_SETUP2_LEVEL_TRIGGER (0UL << 10) | |
63 | #define SPI_SETUP2_EDGE_TRIGGER (1UL << 10) | |
64 | ||
65 | #define SPI_CTRL_SEN(x) ((x) << 7) | |
66 | #define SPI_CTRL_WORD_SIZE(x) (((x) - 1) << 2) | |
67 | #define SPI_CTRL_WR (1UL << 1) | |
68 | #define SPI_CTRL_RD (1UL << 0) | |
69 | ||
70 | #define SPI_STATUS_WE (1UL << 1) | |
71 | #define SPI_STATUS_RD (1UL << 0) | |
72 | ||
73 | #define WRITE 0 | |
74 | #define READ 1 | |
75 | ||
76 | ||
77 | /* use PIO for small transfers, avoiding DMA setup/teardown overhead and | |
78 | * cache operations; better heuristics consider wordsize and bitrate. | |
79 | */ | |
80 | #define DMA_MIN_BYTES 8 | |
81 | ||
82 | #define SPI_RUNNING 0 | |
83 | #define SPI_SHUTDOWN 1 | |
84 | ||
85 | struct omap1_spi100k { | |
86 | struct work_struct work; | |
87 | ||
88 | /* lock protects queue and registers */ | |
89 | spinlock_t lock; | |
90 | struct list_head msg_queue; | |
91 | struct spi_master *master; | |
92 | struct clk *ick; | |
93 | struct clk *fck; | |
94 | ||
95 | /* Virtual base address of the controller */ | |
96 | void __iomem *base; | |
97 | ||
98 | /* State of the SPI */ | |
99 | unsigned int state; | |
100 | }; | |
101 | ||
102 | struct omap1_spi100k_cs { | |
103 | void __iomem *base; | |
104 | int word_len; | |
105 | }; | |
106 | ||
107 | static struct workqueue_struct *omap1_spi100k_wq; | |
108 | ||
109 | #define MOD_REG_BIT(val, mask, set) do { \ | |
110 | if (set) \ | |
111 | val |= mask; \ | |
112 | else \ | |
113 | val &= ~mask; \ | |
114 | } while (0) | |
115 | ||
116 | static void spi100k_enable_clock(struct spi_master *master) | |
117 | { | |
118 | unsigned int val; | |
119 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
120 | ||
121 | /* enable SPI */ | |
122 | val = readw(spi100k->base + SPI_SETUP1); | |
123 | val |= SPI_SETUP1_CLOCK_ENABLE; | |
124 | writew(val, spi100k->base + SPI_SETUP1); | |
125 | } | |
126 | ||
127 | static void spi100k_disable_clock(struct spi_master *master) | |
128 | { | |
129 | unsigned int val; | |
130 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
131 | ||
132 | /* disable SPI */ | |
133 | val = readw(spi100k->base + SPI_SETUP1); | |
134 | val &= ~SPI_SETUP1_CLOCK_ENABLE; | |
135 | writew(val, spi100k->base + SPI_SETUP1); | |
136 | } | |
137 | ||
138 | static void spi100k_write_data(struct spi_master *master, int len, int data) | |
139 | { | |
140 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
141 | ||
5c2818cd CM |
142 | /* write 16-bit word, shifting 8-bit data if necessary */ |
143 | if (len <= 8) { | |
144 | data <<= 8; | |
145 | len = 16; | |
146 | } | |
147 | ||
35c9049b CM |
148 | spi100k_enable_clock(master); |
149 | writew( data , spi100k->base + SPI_TX_MSB); | |
150 | ||
151 | writew(SPI_CTRL_SEN(0) | | |
152 | SPI_CTRL_WORD_SIZE(len) | | |
153 | SPI_CTRL_WR, | |
154 | spi100k->base + SPI_CTRL); | |
155 | ||
156 | /* Wait for bit ack send change */ | |
157 | while((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_WE) != SPI_STATUS_WE); | |
158 | udelay(1000); | |
159 | ||
160 | spi100k_disable_clock(master); | |
161 | } | |
162 | ||
163 | static int spi100k_read_data(struct spi_master *master, int len) | |
164 | { | |
165 | int dataH,dataL; | |
166 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
167 | ||
5c2818cd CM |
168 | /* Always do at least 16 bits */ |
169 | if (len <= 8) | |
170 | len = 16; | |
171 | ||
35c9049b CM |
172 | spi100k_enable_clock(master); |
173 | writew(SPI_CTRL_SEN(0) | | |
174 | SPI_CTRL_WORD_SIZE(len) | | |
175 | SPI_CTRL_RD, | |
176 | spi100k->base + SPI_CTRL); | |
177 | ||
178 | while((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_RD) != SPI_STATUS_RD); | |
179 | udelay(1000); | |
180 | ||
181 | dataL = readw(spi100k->base + SPI_RX_LSB); | |
182 | dataH = readw(spi100k->base + SPI_RX_MSB); | |
183 | spi100k_disable_clock(master); | |
184 | ||
185 | return dataL; | |
186 | } | |
187 | ||
188 | static void spi100k_open(struct spi_master *master) | |
189 | { | |
190 | /* get control of SPI */ | |
191 | struct omap1_spi100k *spi100k = spi_master_get_devdata(master); | |
192 | ||
193 | writew(SPI_SETUP1_INT_READ_ENABLE | | |
194 | SPI_SETUP1_INT_WRITE_ENABLE | | |
195 | SPI_SETUP1_CLOCK_DIVISOR(0), spi100k->base + SPI_SETUP1); | |
196 | ||
197 | /* configure clock and interrupts */ | |
198 | writew(SPI_SETUP2_ACTIVE_EDGE_FALLING | | |
199 | SPI_SETUP2_NEGATIVE_LEVEL | | |
200 | SPI_SETUP2_LEVEL_TRIGGER, spi100k->base + SPI_SETUP2); | |
201 | } | |
202 | ||
203 | static void omap1_spi100k_force_cs(struct omap1_spi100k *spi100k, int enable) | |
204 | { | |
205 | if (enable) | |
206 | writew(0x05fc, spi100k->base + SPI_CTRL); | |
207 | else | |
208 | writew(0x05fd, spi100k->base + SPI_CTRL); | |
209 | } | |
210 | ||
211 | static unsigned | |
212 | omap1_spi100k_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) | |
213 | { | |
214 | struct omap1_spi100k *spi100k; | |
215 | struct omap1_spi100k_cs *cs = spi->controller_state; | |
216 | unsigned int count, c; | |
217 | int word_len; | |
218 | ||
219 | spi100k = spi_master_get_devdata(spi->master); | |
220 | count = xfer->len; | |
221 | c = count; | |
222 | word_len = cs->word_len; | |
223 | ||
35c9049b CM |
224 | if (word_len <= 8) { |
225 | u8 *rx; | |
226 | const u8 *tx; | |
227 | ||
228 | rx = xfer->rx_buf; | |
229 | tx = xfer->tx_buf; | |
230 | do { | |
231 | c-=1; | |
232 | if (xfer->tx_buf != NULL) | |
5c2818cd | 233 | spi100k_write_data(spi->master, word_len, *tx++); |
35c9049b | 234 | if (xfer->rx_buf != NULL) |
5c2818cd | 235 | *rx++ = spi100k_read_data(spi->master, word_len); |
35c9049b CM |
236 | } while(c); |
237 | } else if (word_len <= 16) { | |
238 | u16 *rx; | |
239 | const u16 *tx; | |
240 | ||
241 | rx = xfer->rx_buf; | |
242 | tx = xfer->tx_buf; | |
243 | do { | |
244 | c-=2; | |
245 | if (xfer->tx_buf != NULL) | |
246 | spi100k_write_data(spi->master,word_len, *tx++); | |
247 | if (xfer->rx_buf != NULL) | |
248 | *rx++ = spi100k_read_data(spi->master,word_len); | |
249 | } while(c); | |
250 | } else if (word_len <= 32) { | |
251 | u32 *rx; | |
252 | const u32 *tx; | |
253 | ||
254 | rx = xfer->rx_buf; | |
255 | tx = xfer->tx_buf; | |
256 | do { | |
257 | c-=4; | |
258 | if (xfer->tx_buf != NULL) | |
259 | spi100k_write_data(spi->master,word_len, *tx); | |
260 | if (xfer->rx_buf != NULL) | |
261 | *rx = spi100k_read_data(spi->master,word_len); | |
262 | } while(c); | |
263 | } | |
264 | return count - c; | |
265 | } | |
266 | ||
267 | /* called only when no transfer is active to this device */ | |
268 | static int omap1_spi100k_setup_transfer(struct spi_device *spi, | |
269 | struct spi_transfer *t) | |
270 | { | |
271 | struct omap1_spi100k *spi100k = spi_master_get_devdata(spi->master); | |
272 | struct omap1_spi100k_cs *cs = spi->controller_state; | |
273 | u8 word_len = spi->bits_per_word; | |
274 | ||
275 | if (t != NULL && t->bits_per_word) | |
276 | word_len = t->bits_per_word; | |
277 | if (!word_len) | |
278 | word_len = 8; | |
279 | ||
280 | if (spi->bits_per_word > 32) | |
281 | return -EINVAL; | |
282 | cs->word_len = word_len; | |
283 | ||
284 | /* SPI init before transfer */ | |
285 | writew(0x3e , spi100k->base + SPI_SETUP1); | |
286 | writew(0x00 , spi100k->base + SPI_STATUS); | |
287 | writew(0x3e , spi100k->base + SPI_CTRL); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | /* the spi->mode bits understood by this driver: */ | |
293 | #define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) | |
294 | ||
295 | static int omap1_spi100k_setup(struct spi_device *spi) | |
296 | { | |
297 | int ret; | |
298 | struct omap1_spi100k *spi100k; | |
299 | struct omap1_spi100k_cs *cs = spi->controller_state; | |
300 | ||
301 | if (spi->bits_per_word < 4 || spi->bits_per_word > 32) { | |
302 | dev_dbg(&spi->dev, "setup: unsupported %d bit words\n", | |
303 | spi->bits_per_word); | |
304 | return -EINVAL; | |
305 | } | |
306 | ||
307 | spi100k = spi_master_get_devdata(spi->master); | |
308 | ||
309 | if (!cs) { | |
310 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
311 | if (!cs) | |
312 | return -ENOMEM; | |
313 | cs->base = spi100k->base + spi->chip_select * 0x14; | |
314 | spi->controller_state = cs; | |
315 | } | |
316 | ||
317 | spi100k_open(spi->master); | |
318 | ||
319 | clk_enable(spi100k->ick); | |
320 | clk_enable(spi100k->fck); | |
321 | ||
322 | ret = omap1_spi100k_setup_transfer(spi, NULL); | |
323 | ||
324 | clk_disable(spi100k->ick); | |
325 | clk_disable(spi100k->fck); | |
326 | ||
327 | return ret; | |
328 | } | |
329 | ||
330 | static void omap1_spi100k_work(struct work_struct *work) | |
331 | { | |
332 | struct omap1_spi100k *spi100k; | |
333 | int status = 0; | |
334 | ||
335 | spi100k = container_of(work, struct omap1_spi100k, work); | |
336 | spin_lock_irq(&spi100k->lock); | |
337 | ||
338 | clk_enable(spi100k->ick); | |
339 | clk_enable(spi100k->fck); | |
340 | ||
341 | /* We only enable one channel at a time -- the one whose message is | |
342 | * at the head of the queue -- although this controller would gladly | |
343 | * arbitrate among multiple channels. This corresponds to "single | |
344 | * channel" master mode. As a side effect, we need to manage the | |
345 | * chipselect with the FORCE bit ... CS != channel enable. | |
346 | */ | |
347 | while (!list_empty(&spi100k->msg_queue)) { | |
348 | struct spi_message *m; | |
349 | struct spi_device *spi; | |
350 | struct spi_transfer *t = NULL; | |
351 | int cs_active = 0; | |
352 | struct omap1_spi100k_cs *cs; | |
353 | int par_override = 0; | |
354 | ||
355 | m = container_of(spi100k->msg_queue.next, struct spi_message, | |
356 | queue); | |
357 | ||
358 | list_del_init(&m->queue); | |
359 | spin_unlock_irq(&spi100k->lock); | |
360 | ||
361 | spi = m->spi; | |
362 | cs = spi->controller_state; | |
363 | ||
364 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
365 | if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { | |
366 | status = -EINVAL; | |
367 | break; | |
368 | } | |
369 | if (par_override || t->speed_hz || t->bits_per_word) { | |
370 | par_override = 1; | |
371 | status = omap1_spi100k_setup_transfer(spi, t); | |
372 | if (status < 0) | |
373 | break; | |
374 | if (!t->speed_hz && !t->bits_per_word) | |
375 | par_override = 0; | |
376 | } | |
377 | ||
378 | if (!cs_active) { | |
379 | omap1_spi100k_force_cs(spi100k, 1); | |
380 | cs_active = 1; | |
381 | } | |
382 | ||
383 | if (t->len) { | |
384 | unsigned count; | |
385 | ||
35c9049b CM |
386 | count = omap1_spi100k_txrx_pio(spi, t); |
387 | m->actual_length += count; | |
388 | ||
389 | if (count != t->len) { | |
390 | status = -EIO; | |
391 | break; | |
392 | } | |
393 | } | |
394 | ||
395 | if (t->delay_usecs) | |
396 | udelay(t->delay_usecs); | |
397 | ||
398 | /* ignore the "leave it on after last xfer" hint */ | |
399 | ||
400 | if (t->cs_change) { | |
401 | omap1_spi100k_force_cs(spi100k, 0); | |
402 | cs_active = 0; | |
403 | } | |
404 | } | |
405 | ||
406 | /* Restore defaults if they were overriden */ | |
407 | if (par_override) { | |
408 | par_override = 0; | |
409 | status = omap1_spi100k_setup_transfer(spi, NULL); | |
410 | } | |
411 | ||
412 | if (cs_active) | |
413 | omap1_spi100k_force_cs(spi100k, 0); | |
414 | ||
415 | m->status = status; | |
416 | m->complete(m->context); | |
417 | ||
418 | spin_lock_irq(&spi100k->lock); | |
419 | } | |
420 | ||
421 | clk_disable(spi100k->ick); | |
422 | clk_disable(spi100k->fck); | |
423 | spin_unlock_irq(&spi100k->lock); | |
424 | ||
425 | if (status < 0) | |
426 | printk(KERN_WARNING "spi transfer failed with %d\n", status); | |
427 | } | |
428 | ||
429 | static int omap1_spi100k_transfer(struct spi_device *spi, struct spi_message *m) | |
430 | { | |
431 | struct omap1_spi100k *spi100k; | |
432 | unsigned long flags; | |
433 | struct spi_transfer *t; | |
434 | ||
435 | m->actual_length = 0; | |
436 | m->status = -EINPROGRESS; | |
437 | ||
438 | spi100k = spi_master_get_devdata(spi->master); | |
439 | ||
440 | /* Don't accept new work if we're shutting down */ | |
441 | if (spi100k->state == SPI_SHUTDOWN) | |
442 | return -ESHUTDOWN; | |
443 | ||
444 | /* reject invalid messages and transfers */ | |
445 | if (list_empty(&m->transfers) || !m->complete) | |
446 | return -EINVAL; | |
447 | ||
448 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
449 | const void *tx_buf = t->tx_buf; | |
450 | void *rx_buf = t->rx_buf; | |
451 | unsigned len = t->len; | |
452 | ||
453 | if (t->speed_hz > OMAP1_SPI100K_MAX_FREQ | |
454 | || (len && !(rx_buf || tx_buf)) | |
455 | || (t->bits_per_word && | |
456 | ( t->bits_per_word < 4 | |
457 | || t->bits_per_word > 32))) { | |
458 | dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n", | |
459 | t->speed_hz, | |
460 | len, | |
461 | tx_buf ? "tx" : "", | |
462 | rx_buf ? "rx" : "", | |
463 | t->bits_per_word); | |
464 | return -EINVAL; | |
465 | } | |
466 | ||
467 | if (t->speed_hz && t->speed_hz < OMAP1_SPI100K_MAX_FREQ/(1<<16)) { | |
468 | dev_dbg(&spi->dev, "%d Hz max exceeds %d\n", | |
469 | t->speed_hz, | |
470 | OMAP1_SPI100K_MAX_FREQ/(1<<16)); | |
471 | return -EINVAL; | |
472 | } | |
473 | ||
474 | } | |
475 | ||
476 | spin_lock_irqsave(&spi100k->lock, flags); | |
477 | list_add_tail(&m->queue, &spi100k->msg_queue); | |
478 | queue_work(omap1_spi100k_wq, &spi100k->work); | |
479 | spin_unlock_irqrestore(&spi100k->lock, flags); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | static int __init omap1_spi100k_reset(struct omap1_spi100k *spi100k) | |
485 | { | |
486 | return 0; | |
487 | } | |
488 | ||
fd4a319b | 489 | static int omap1_spi100k_probe(struct platform_device *pdev) |
35c9049b CM |
490 | { |
491 | struct spi_master *master; | |
492 | struct omap1_spi100k *spi100k; | |
493 | int status = 0; | |
494 | ||
495 | if (!pdev->id) | |
496 | return -EINVAL; | |
497 | ||
498 | master = spi_alloc_master(&pdev->dev, sizeof *spi100k); | |
499 | if (master == NULL) { | |
500 | dev_dbg(&pdev->dev, "master allocation failed\n"); | |
501 | return -ENOMEM; | |
502 | } | |
503 | ||
504 | if (pdev->id != -1) | |
505 | master->bus_num = pdev->id; | |
506 | ||
507 | master->setup = omap1_spi100k_setup; | |
508 | master->transfer = omap1_spi100k_transfer; | |
509 | master->cleanup = NULL; | |
510 | master->num_chipselect = 2; | |
511 | master->mode_bits = MODEBITS; | |
512 | ||
513 | dev_set_drvdata(&pdev->dev, master); | |
514 | ||
515 | spi100k = spi_master_get_devdata(master); | |
516 | spi100k->master = master; | |
517 | ||
518 | /* | |
519 | * The memory region base address is taken as the platform_data. | |
520 | * You should allocate this with ioremap() before initializing | |
521 | * the SPI. | |
522 | */ | |
523 | spi100k->base = (void __iomem *) pdev->dev.platform_data; | |
524 | ||
525 | INIT_WORK(&spi100k->work, omap1_spi100k_work); | |
526 | ||
527 | spin_lock_init(&spi100k->lock); | |
528 | INIT_LIST_HEAD(&spi100k->msg_queue); | |
529 | spi100k->ick = clk_get(&pdev->dev, "ick"); | |
530 | if (IS_ERR(spi100k->ick)) { | |
531 | dev_dbg(&pdev->dev, "can't get spi100k_ick\n"); | |
532 | status = PTR_ERR(spi100k->ick); | |
533 | goto err1; | |
534 | } | |
535 | ||
536 | spi100k->fck = clk_get(&pdev->dev, "fck"); | |
537 | if (IS_ERR(spi100k->fck)) { | |
538 | dev_dbg(&pdev->dev, "can't get spi100k_fck\n"); | |
539 | status = PTR_ERR(spi100k->fck); | |
540 | goto err2; | |
541 | } | |
542 | ||
543 | if (omap1_spi100k_reset(spi100k) < 0) | |
544 | goto err3; | |
545 | ||
546 | status = spi_register_master(master); | |
547 | if (status < 0) | |
548 | goto err3; | |
549 | ||
550 | spi100k->state = SPI_RUNNING; | |
551 | ||
552 | return status; | |
553 | ||
554 | err3: | |
555 | clk_put(spi100k->fck); | |
556 | err2: | |
557 | clk_put(spi100k->ick); | |
558 | err1: | |
559 | spi_master_put(master); | |
560 | return status; | |
561 | } | |
562 | ||
563 | static int __exit omap1_spi100k_remove(struct platform_device *pdev) | |
564 | { | |
565 | struct spi_master *master; | |
566 | struct omap1_spi100k *spi100k; | |
567 | struct resource *r; | |
568 | unsigned limit = 500; | |
569 | unsigned long flags; | |
570 | int status = 0; | |
571 | ||
572 | master = dev_get_drvdata(&pdev->dev); | |
573 | spi100k = spi_master_get_devdata(master); | |
574 | ||
575 | spin_lock_irqsave(&spi100k->lock, flags); | |
576 | ||
577 | spi100k->state = SPI_SHUTDOWN; | |
578 | while (!list_empty(&spi100k->msg_queue) && limit--) { | |
579 | spin_unlock_irqrestore(&spi100k->lock, flags); | |
580 | msleep(10); | |
581 | spin_lock_irqsave(&spi100k->lock, flags); | |
582 | } | |
583 | ||
584 | if (!list_empty(&spi100k->msg_queue)) | |
585 | status = -EBUSY; | |
586 | ||
587 | spin_unlock_irqrestore(&spi100k->lock, flags); | |
588 | ||
589 | if (status != 0) | |
590 | return status; | |
591 | ||
592 | clk_put(spi100k->fck); | |
593 | clk_put(spi100k->ick); | |
594 | ||
595 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
596 | ||
597 | spi_unregister_master(master); | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | static struct platform_driver omap1_spi100k_driver = { | |
603 | .driver = { | |
604 | .name = "omap1_spi100k", | |
605 | .owner = THIS_MODULE, | |
606 | }, | |
607 | .remove = __exit_p(omap1_spi100k_remove), | |
608 | }; | |
609 | ||
610 | ||
611 | static int __init omap1_spi100k_init(void) | |
612 | { | |
613 | omap1_spi100k_wq = create_singlethread_workqueue( | |
614 | omap1_spi100k_driver.driver.name); | |
615 | ||
616 | if (omap1_spi100k_wq == NULL) | |
617 | return -1; | |
618 | ||
619 | return platform_driver_probe(&omap1_spi100k_driver, omap1_spi100k_probe); | |
620 | } | |
621 | ||
622 | static void __exit omap1_spi100k_exit(void) | |
623 | { | |
624 | platform_driver_unregister(&omap1_spi100k_driver); | |
625 | ||
626 | destroy_workqueue(omap1_spi100k_wq); | |
627 | } | |
628 | ||
629 | module_init(omap1_spi100k_init); | |
630 | module_exit(omap1_spi100k_exit); | |
631 | ||
632 | MODULE_DESCRIPTION("OMAP7xx SPI 100k controller driver"); | |
633 | MODULE_AUTHOR("Fabrice Crohas <fcrohas@gmail.com>"); | |
634 | MODULE_LICENSE("GPL"); | |
635 |