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clk: nomadik: Migrate to clk_hw based OF and registration APIs
[linux-2.6/btrfs-unstable.git] / drivers / mmc / host / bfin_sdh.c
blob526231e385831526c6f64f9dd8cb8d333c514de5
1 /*
2 * bfin_sdh.c - Analog Devices Blackfin SDH Controller
3 *
4 * Copyright (C) 2007-2009 Analog Device Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9 #define DRIVER_NAME "bfin-sdh"
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/ioport.h>
14 #include <linux/platform_device.h>
15 #include <linux/delay.h>
16 #include <linux/interrupt.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/mmc/host.h>
19 #include <linux/proc_fs.h>
20 #include <linux/gfp.h>
21
22 #include <asm/cacheflush.h>
23 #include <asm/dma.h>
24 #include <asm/portmux.h>
25 #include <asm/bfin_sdh.h>
26
27 #if defined(CONFIG_BF51x) || defined(__ADSPBF60x__)
28 #define bfin_read_SDH_CLK_CTL bfin_read_RSI_CLK_CTL
29 #define bfin_write_SDH_CLK_CTL bfin_write_RSI_CLK_CTL
30 #define bfin_write_SDH_ARGUMENT bfin_write_RSI_ARGUMENT
31 #define bfin_write_SDH_COMMAND bfin_write_RSI_COMMAND
32 #define bfin_write_SDH_DATA_TIMER bfin_write_RSI_DATA_TIMER
33 #define bfin_read_SDH_RESPONSE0 bfin_read_RSI_RESPONSE0
34 #define bfin_read_SDH_RESPONSE1 bfin_read_RSI_RESPONSE1
35 #define bfin_read_SDH_RESPONSE2 bfin_read_RSI_RESPONSE2
36 #define bfin_read_SDH_RESPONSE3 bfin_read_RSI_RESPONSE3
37 #define bfin_write_SDH_DATA_LGTH bfin_write_RSI_DATA_LGTH
38 #define bfin_read_SDH_DATA_CTL bfin_read_RSI_DATA_CTL
39 #define bfin_write_SDH_DATA_CTL bfin_write_RSI_DATA_CTL
40 #define bfin_read_SDH_DATA_CNT bfin_read_RSI_DATA_CNT
41 #define bfin_write_SDH_STATUS_CLR bfin_write_RSI_STATUS_CLR
42 #define bfin_read_SDH_E_STATUS bfin_read_RSI_E_STATUS
43 #define bfin_write_SDH_E_STATUS bfin_write_RSI_E_STATUS
44 #define bfin_read_SDH_STATUS bfin_read_RSI_STATUS
45 #define bfin_write_SDH_MASK0 bfin_write_RSI_MASK0
46 #define bfin_write_SDH_E_MASK bfin_write_RSI_E_MASK
47 #define bfin_read_SDH_CFG bfin_read_RSI_CFG
48 #define bfin_write_SDH_CFG bfin_write_RSI_CFG
49 # if defined(__ADSPBF60x__)
50 # define bfin_read_SDH_BLK_SIZE bfin_read_RSI_BLKSZ
51 # define bfin_write_SDH_BLK_SIZE bfin_write_RSI_BLKSZ
52 # else
53 # define bfin_read_SDH_PWR_CTL bfin_read_RSI_PWR_CTL
54 # define bfin_write_SDH_PWR_CTL bfin_write_RSI_PWR_CTL
55 # endif
56 #endif
57
58 struct sdh_host {
59 struct mmc_host *mmc;
60 spinlock_t lock;
61 struct resource *res;
62 void __iomem *base;
63 int irq;
64 int stat_irq;
65 int dma_ch;
66 int dma_dir;
67 struct dma_desc_array *sg_cpu;
68 dma_addr_t sg_dma;
69 int dma_len;
70
71 unsigned long sclk;
72 unsigned int imask;
73 unsigned int power_mode;
74 unsigned int clk_div;
75
76 struct mmc_request *mrq;
77 struct mmc_command *cmd;
78 struct mmc_data *data;
79 };
80
81 static struct bfin_sd_host *get_sdh_data(struct platform_device *pdev)
82 {
83 return pdev->dev.platform_data;
84 }
85
86 static void sdh_stop_clock(struct sdh_host *host)
87 {
88 bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() & ~CLK_E);
89 SSYNC();
90 }
91
92 static void sdh_enable_stat_irq(struct sdh_host *host, unsigned int mask)
93 {
94 unsigned long flags;
95
96 spin_lock_irqsave(&host->lock, flags);
97 host->imask |= mask;
98 bfin_write_SDH_MASK0(mask);
99 SSYNC();
100 spin_unlock_irqrestore(&host->lock, flags);
101 }
102
103 static void sdh_disable_stat_irq(struct sdh_host *host, unsigned int mask)
104 {
105 unsigned long flags;
106
107 spin_lock_irqsave(&host->lock, flags);
108 host->imask &= ~mask;
109 bfin_write_SDH_MASK0(host->imask);
110 SSYNC();
111 spin_unlock_irqrestore(&host->lock, flags);
112 }
113
114 static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
115 {
116 unsigned int length;
117 unsigned int data_ctl;
118 unsigned int dma_cfg;
119 unsigned int cycle_ns, timeout;
120
121 dev_dbg(mmc_dev(host->mmc), "%s enter flags: 0x%x\n", __func__, data->flags);
122 host->data = data;
123 data_ctl = 0;
124 dma_cfg = 0;
125
126 length = data->blksz * data->blocks;
127 bfin_write_SDH_DATA_LGTH(length);
128
129 if (data->flags & MMC_DATA_READ)
130 data_ctl |= DTX_DIR;
131 /* Only supports power-of-2 block size */
132 if (data->blksz & (data->blksz - 1))
133 return -EINVAL;
134 #ifndef RSI_BLKSZ
135 data_ctl |= ((ffs(data->blksz) - 1) << 4);
136 #else
137 bfin_write_SDH_BLK_SIZE(data->blksz);
138 #endif
139
140 bfin_write_SDH_DATA_CTL(data_ctl);
141 /* the time of a host clock period in ns */
142 cycle_ns = 1000000000 / (host->sclk / (2 * (host->clk_div + 1)));
143 timeout = data->timeout_ns / cycle_ns;
144 timeout += data->timeout_clks;
145 bfin_write_SDH_DATA_TIMER(timeout);
146 SSYNC();
147
148 if (data->flags & MMC_DATA_READ) {
149 host->dma_dir = DMA_FROM_DEVICE;
150 dma_cfg |= WNR;
151 } else
152 host->dma_dir = DMA_TO_DEVICE;
153
154 sdh_enable_stat_irq(host, (DAT_CRC_FAIL | DAT_TIME_OUT | DAT_END));
155 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma_dir);
156 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
157 dma_cfg |= DMAFLOW_ARRAY | RESTART | WDSIZE_32 | DMAEN;
158 # ifdef RSI_BLKSZ
159 dma_cfg |= PSIZE_32 | NDSIZE_3;
160 # else
161 dma_cfg |= NDSIZE_5;
162 # endif
163 {
164 struct scatterlist *sg;
165 int i;
166 for_each_sg(data->sg, sg, host->dma_len, i) {
167 host->sg_cpu[i].start_addr = sg_dma_address(sg);
168 host->sg_cpu[i].cfg = dma_cfg;
169 host->sg_cpu[i].x_count = sg_dma_len(sg) / 4;
170 host->sg_cpu[i].x_modify = 4;
171 dev_dbg(mmc_dev(host->mmc), "%d: start_addr:0x%lx, "
172 "cfg:0x%lx, x_count:0x%lx, x_modify:0x%lx\n",
173 i, host->sg_cpu[i].start_addr,
174 host->sg_cpu[i].cfg, host->sg_cpu[i].x_count,
175 host->sg_cpu[i].x_modify);
176 }
177 }
178 flush_dcache_range((unsigned int)host->sg_cpu,
179 (unsigned int)host->sg_cpu +
180 host->dma_len * sizeof(struct dma_desc_array));
181 /* Set the last descriptor to stop mode */
182 host->sg_cpu[host->dma_len - 1].cfg &= ~(DMAFLOW | NDSIZE);
183 host->sg_cpu[host->dma_len - 1].cfg |= DI_EN;
184
185 set_dma_curr_desc_addr(host->dma_ch, (unsigned long *)host->sg_dma);
186 set_dma_x_count(host->dma_ch, 0);
187 set_dma_x_modify(host->dma_ch, 0);
188 SSYNC();
189 set_dma_config(host->dma_ch, dma_cfg);
190 #elif defined(CONFIG_BF51x)
191 /* RSI DMA doesn't work in array mode */
192 dma_cfg |= WDSIZE_32 | DMAEN;
193 set_dma_start_addr(host->dma_ch, sg_dma_address(&data->sg[0]));
194 set_dma_x_count(host->dma_ch, length / 4);
195 set_dma_x_modify(host->dma_ch, 4);
196 SSYNC();
197 set_dma_config(host->dma_ch, dma_cfg);
198 #endif
199 bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
200
201 SSYNC();
202
203 dev_dbg(mmc_dev(host->mmc), "%s exit\n", __func__);
204 return 0;
205 }
206
207 static void sdh_start_cmd(struct sdh_host *host, struct mmc_command *cmd)
208 {
209 unsigned int sdh_cmd;
210 unsigned int stat_mask;
211
212 dev_dbg(mmc_dev(host->mmc), "%s enter cmd: 0x%p\n", __func__, cmd);
213 WARN_ON(host->cmd != NULL);
214 host->cmd = cmd;
215
216 sdh_cmd = 0;
217 stat_mask = 0;
218
219 sdh_cmd |= cmd->opcode;
220
221 if (cmd->flags & MMC_RSP_PRESENT) {
222 sdh_cmd |= CMD_RSP;
223 stat_mask |= CMD_RESP_END;
224 } else {
225 stat_mask |= CMD_SENT;
226 }
227
228 if (cmd->flags & MMC_RSP_136)
229 sdh_cmd |= CMD_L_RSP;
230
231 stat_mask |= CMD_CRC_FAIL | CMD_TIME_OUT;
232
233 sdh_enable_stat_irq(host, stat_mask);
234
235 bfin_write_SDH_ARGUMENT(cmd->arg);
236 bfin_write_SDH_COMMAND(sdh_cmd | CMD_E);
237 bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() | CLK_E);
238 SSYNC();
239 }
240
241 static void sdh_finish_request(struct sdh_host *host, struct mmc_request *mrq)
242 {
243 dev_dbg(mmc_dev(host->mmc), "%s enter\n", __func__);
244 host->mrq = NULL;
245 host->cmd = NULL;
246 host->data = NULL;
247 mmc_request_done(host->mmc, mrq);
248 }
249
250 static int sdh_cmd_done(struct sdh_host *host, unsigned int stat)
251 {
252 struct mmc_command *cmd = host->cmd;
253 int ret = 0;
254
255 dev_dbg(mmc_dev(host->mmc), "%s enter cmd: %p\n", __func__, cmd);
256 if (!cmd)
257 return 0;
258
259 host->cmd = NULL;
260
261 if (cmd->flags & MMC_RSP_PRESENT) {
262 cmd->resp[0] = bfin_read_SDH_RESPONSE0();
263 if (cmd->flags & MMC_RSP_136) {
264 cmd->resp[1] = bfin_read_SDH_RESPONSE1();
265 cmd->resp[2] = bfin_read_SDH_RESPONSE2();
266 cmd->resp[3] = bfin_read_SDH_RESPONSE3();
267 }
268 }
269 if (stat & CMD_TIME_OUT)
270 cmd->error = -ETIMEDOUT;
271 else if (stat & CMD_CRC_FAIL && cmd->flags & MMC_RSP_CRC)
272 cmd->error = -EILSEQ;
273
274 sdh_disable_stat_irq(host, (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL));
275
276 if (host->data && !cmd->error) {
277 if (host->data->flags & MMC_DATA_WRITE) {
278 ret = sdh_setup_data(host, host->data);
279 if (ret)
280 return 0;
281 }
282
283 sdh_enable_stat_irq(host, DAT_END | RX_OVERRUN | TX_UNDERRUN | DAT_TIME_OUT);
284 } else
285 sdh_finish_request(host, host->mrq);
286
287 return 1;
288 }
289
290 static int sdh_data_done(struct sdh_host *host, unsigned int stat)
291 {
292 struct mmc_data *data = host->data;
293
294 dev_dbg(mmc_dev(host->mmc), "%s enter stat: 0x%x\n", __func__, stat);
295 if (!data)
296 return 0;
297
298 disable_dma(host->dma_ch);
299 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
300 host->dma_dir);
301
302 if (stat & DAT_TIME_OUT)
303 data->error = -ETIMEDOUT;
304 else if (stat & DAT_CRC_FAIL)
305 data->error = -EILSEQ;
306 else if (stat & (RX_OVERRUN | TX_UNDERRUN))
307 data->error = -EIO;
308
309 if (!data->error)
310 data->bytes_xfered = data->blocks * data->blksz;
311 else
312 data->bytes_xfered = 0;
313
314 bfin_write_SDH_STATUS_CLR(DAT_END_STAT | DAT_TIMEOUT_STAT | \
315 DAT_CRC_FAIL_STAT | DAT_BLK_END_STAT | RX_OVERRUN | TX_UNDERRUN);
316 bfin_write_SDH_DATA_CTL(0);
317 SSYNC();
318
319 host->data = NULL;
320 if (host->mrq->stop) {
321 sdh_stop_clock(host);
322 sdh_start_cmd(host, host->mrq->stop);
323 } else {
324 sdh_finish_request(host, host->mrq);
325 }
326
327 return 1;
328 }
329
330 static void sdh_request(struct mmc_host *mmc, struct mmc_request *mrq)
331 {
332 struct sdh_host *host = mmc_priv(mmc);
333 int ret = 0;
334
335 dev_dbg(mmc_dev(host->mmc), "%s enter, mrp:%p, cmd:%p\n", __func__, mrq, mrq->cmd);
336 WARN_ON(host->mrq != NULL);
337
338 spin_lock(&host->lock);
339 host->mrq = mrq;
340 host->data = mrq->data;
341
342 if (mrq->data && mrq->data->flags & MMC_DATA_READ) {
343 ret = sdh_setup_data(host, mrq->data);
344 if (ret)
345 goto data_err;
346 }
347
348 sdh_start_cmd(host, mrq->cmd);
349 data_err:
350 spin_unlock(&host->lock);
351 }
352
353 static void sdh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
354 {
355 struct sdh_host *host;
356 u16 clk_ctl = 0;
357 #ifndef RSI_BLKSZ
358 u16 pwr_ctl = 0;
359 #endif
360 u16 cfg;
361 host = mmc_priv(mmc);
362
363 spin_lock(&host->lock);
364
365 cfg = bfin_read_SDH_CFG();
366 cfg |= MWE;
367 switch (ios->bus_width) {
368 case MMC_BUS_WIDTH_4:
369 #ifndef RSI_BLKSZ
370 cfg &= ~PD_SDDAT3;
371 #endif
372 cfg |= PUP_SDDAT3;
373 /* Enable 4 bit SDIO */
374 cfg |= SD4E;
375 clk_ctl |= WIDE_BUS_4;
376 break;
377 case MMC_BUS_WIDTH_8:
378 #ifndef RSI_BLKSZ
379 cfg &= ~PD_SDDAT3;
380 #endif
381 cfg |= PUP_SDDAT3;
382 /* Disable 4 bit SDIO */
383 cfg &= ~SD4E;
384 clk_ctl |= BYTE_BUS_8;
385 break;
386 default:
387 cfg &= ~PUP_SDDAT3;
388 /* Disable 4 bit SDIO */
389 cfg &= ~SD4E;
390 }
391 bfin_write_SDH_CFG(cfg);
392
393 host->power_mode = ios->power_mode;
394 #ifndef RSI_BLKSZ
395 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
396 pwr_ctl |= ROD_CTL;
397 # ifndef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
398 pwr_ctl |= SD_CMD_OD;
399 # endif
400 }
401
402 if (ios->power_mode != MMC_POWER_OFF)
403 pwr_ctl |= PWR_ON;
404 else
405 pwr_ctl &= ~PWR_ON;
406
407 bfin_write_SDH_PWR_CTL(pwr_ctl);
408 #else
409 # ifndef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
410 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
411 cfg |= SD_CMD_OD;
412 else
413 cfg &= ~SD_CMD_OD;
414 # endif
415
416 if (ios->power_mode != MMC_POWER_OFF)
417 cfg |= PWR_ON;
418 else
419 cfg &= ~PWR_ON;
420
421 bfin_write_SDH_CFG(cfg);
422 #endif
423 SSYNC();
424
425 if (ios->power_mode == MMC_POWER_ON && ios->clock) {
426 unsigned char clk_div;
427 clk_div = (get_sclk() / ios->clock - 1) / 2;
428 clk_div = min_t(unsigned char, clk_div, 0xFF);
429 clk_ctl |= clk_div;
430 clk_ctl |= CLK_E;
431 host->clk_div = clk_div;
432 bfin_write_SDH_CLK_CTL(clk_ctl);
433 } else
434 sdh_stop_clock(host);
435
436 /* set up sdh interrupt mask*/
437 if (ios->power_mode == MMC_POWER_ON)
438 bfin_write_SDH_MASK0(DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL |
439 RX_OVERRUN | TX_UNDERRUN | CMD_SENT | CMD_RESP_END |
440 CMD_TIME_OUT | CMD_CRC_FAIL);
441 else
442 bfin_write_SDH_MASK0(0);
443 SSYNC();
444
445 spin_unlock(&host->lock);
446
447 dev_dbg(mmc_dev(host->mmc), "SDH: clk_div = 0x%x actual clock:%ld expected clock:%d\n",
448 host->clk_div,
449 host->clk_div ? get_sclk() / (2 * (host->clk_div + 1)) : 0,
450 ios->clock);
451 }
452
453 static const struct mmc_host_ops sdh_ops = {
454 .request = sdh_request,
455 .set_ios = sdh_set_ios,
456 };
457
458 static irqreturn_t sdh_dma_irq(int irq, void *devid)
459 {
460 struct sdh_host *host = devid;
461
462 dev_dbg(mmc_dev(host->mmc), "%s enter, irq_stat: 0x%04lx\n", __func__,
463 get_dma_curr_irqstat(host->dma_ch));
464 clear_dma_irqstat(host->dma_ch);
465 SSYNC();
466
467 return IRQ_HANDLED;
468 }
469
470 static irqreturn_t sdh_stat_irq(int irq, void *devid)
471 {
472 struct sdh_host *host = devid;
473 unsigned int status;
474 int handled = 0;
475
476 dev_dbg(mmc_dev(host->mmc), "%s enter\n", __func__);
477
478 spin_lock(&host->lock);
479
480 status = bfin_read_SDH_E_STATUS();
481 if (status & SD_CARD_DET) {
482 mmc_detect_change(host->mmc, 0);
483 bfin_write_SDH_E_STATUS(SD_CARD_DET);
484 }
485 status = bfin_read_SDH_STATUS();
486 if (status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL)) {
487 handled |= sdh_cmd_done(host, status);
488 bfin_write_SDH_STATUS_CLR(CMD_SENT_STAT | CMD_RESP_END_STAT | \
489 CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT);
490 SSYNC();
491 }
492
493 status = bfin_read_SDH_STATUS();
494 if (status & (DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN))
495 handled |= sdh_data_done(host, status);
496
497 spin_unlock(&host->lock);
498
499 dev_dbg(mmc_dev(host->mmc), "%s exit\n\n", __func__);
500
501 return IRQ_RETVAL(handled);
502 }
503
504 static void sdh_reset(void)
505 {
506 #if defined(CONFIG_BF54x)
507 /* Secure Digital Host shares DMA with Nand controller */
508 bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
509 #endif
510
511 bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
512 SSYNC();
513
514 /* Disable card inserting detection pin. set MMC_CAP_NEEDS_POLL, and
515 * mmc stack will do the detection.
516 */
517 bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3));
518 SSYNC();
519 }
520
521 static int sdh_probe(struct platform_device *pdev)
522 {
523 struct mmc_host *mmc;
524 struct sdh_host *host;
525 struct bfin_sd_host *drv_data = get_sdh_data(pdev);
526 int ret;
527
528 if (!drv_data) {
529 dev_err(&pdev->dev, "missing platform driver data\n");
530 ret = -EINVAL;
531 goto out;
532 }
533
534 mmc = mmc_alloc_host(sizeof(struct sdh_host), &pdev->dev);
535 if (!mmc) {
536 ret = -ENOMEM;
537 goto out;
538 }
539
540 mmc->ops = &sdh_ops;
541 #if defined(CONFIG_BF51x)
542 mmc->max_segs = 1;
543 #else
544 mmc->max_segs = PAGE_SIZE / sizeof(struct dma_desc_array);
545 #endif
546 #ifdef RSI_BLKSZ
547 mmc->max_seg_size = -1;
548 #else
549 mmc->max_seg_size = 1 << 16;
550 #endif
551 mmc->max_blk_size = 1 << 11;
552 mmc->max_blk_count = 1 << 11;
553 mmc->max_req_size = PAGE_SIZE;
554 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
555 mmc->f_max = get_sclk();
556 mmc->f_min = mmc->f_max >> 9;
557 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_NEEDS_POLL;
558 host = mmc_priv(mmc);
559 host->mmc = mmc;
560 host->sclk = get_sclk();
561
562 spin_lock_init(&host->lock);
563 host->irq = drv_data->irq_int0;
564 host->dma_ch = drv_data->dma_chan;
565
566 ret = request_dma(host->dma_ch, DRIVER_NAME "DMA");
567 if (ret) {
568 dev_err(&pdev->dev, "unable to request DMA channel\n");
569 goto out1;
570 }
571
572 ret = set_dma_callback(host->dma_ch, sdh_dma_irq, host);
573 if (ret) {
574 dev_err(&pdev->dev, "unable to request DMA irq\n");
575 goto out2;
576 }
577
578 host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
579 if (host->sg_cpu == NULL) {
580 ret = -ENOMEM;
581 goto out2;
582 }
583
584 platform_set_drvdata(pdev, mmc);
585
586 ret = request_irq(host->irq, sdh_stat_irq, 0, "SDH Status IRQ", host);
587 if (ret) {
588 dev_err(&pdev->dev, "unable to request status irq\n");
589 goto out3;
590 }
591
592 ret = peripheral_request_list(drv_data->pin_req, DRIVER_NAME);
593 if (ret) {
594 dev_err(&pdev->dev, "unable to request peripheral pins\n");
595 goto out4;
596 }
597
598 sdh_reset();
599
600 mmc_add_host(mmc);
601 return 0;
602
603 out4:
604 free_irq(host->irq, host);
605 out3:
606 mmc_remove_host(mmc);
607 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
608 out2:
609 free_dma(host->dma_ch);
610 out1:
611 mmc_free_host(mmc);
612 out:
613 return ret;
614 }
615
616 static int sdh_remove(struct platform_device *pdev)
617 {
618 struct mmc_host *mmc = platform_get_drvdata(pdev);
619
620 if (mmc) {
621 struct sdh_host *host = mmc_priv(mmc);
622
623 mmc_remove_host(mmc);
624
625 sdh_stop_clock(host);
626 free_irq(host->irq, host);
627 free_dma(host->dma_ch);
628 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
629
630 mmc_free_host(mmc);
631 }
632
633 return 0;
634 }
635
636 #ifdef CONFIG_PM
637 static int sdh_suspend(struct platform_device *dev, pm_message_t state)
638 {
639 struct bfin_sd_host *drv_data = get_sdh_data(dev);
640
641 peripheral_free_list(drv_data->pin_req);
642
643 return 0;
644 }
645
646 static int sdh_resume(struct platform_device *dev)
647 {
648 struct bfin_sd_host *drv_data = get_sdh_data(dev);
649 int ret = 0;
650
651 ret = peripheral_request_list(drv_data->pin_req, DRIVER_NAME);
652 if (ret) {
653 dev_err(&dev->dev, "unable to request peripheral pins\n");
654 return ret;
655 }
656
657 sdh_reset();
658 return ret;
659 }
660 #else
661 # define sdh_suspend NULL
662 # define sdh_resume NULL
663 #endif
664
665 static struct platform_driver sdh_driver = {
666 .probe = sdh_probe,
667 .remove = sdh_remove,
668 .suspend = sdh_suspend,
669 .resume = sdh_resume,
670 .driver = {
671 .name = DRIVER_NAME,
672 },
673 };
674
675 module_platform_driver(sdh_driver);
676
677 MODULE_DESCRIPTION("Blackfin Secure Digital Host Driver");
678 MODULE_AUTHOR("Cliff Cai, Roy Huang");
679 MODULE_LICENSE("GPL");
(deprecated) Btrfs devel tree