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eb962d5b CC |
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 | ||
21 | #include <asm/cacheflush.h> | |
22 | #include <asm/dma.h> | |
23 | #include <asm/portmux.h> | |
24 | #include <asm/bfin_sdh.h> | |
25 | ||
26 | #if defined(CONFIG_BF51x) | |
27 | #define bfin_read_SDH_PWR_CTL bfin_read_RSI_PWR_CTL | |
28 | #define bfin_write_SDH_PWR_CTL bfin_write_RSI_PWR_CTL | |
29 | #define bfin_read_SDH_CLK_CTL bfin_read_RSI_CLK_CTL | |
30 | #define bfin_write_SDH_CLK_CTL bfin_write_RSI_CLK_CTL | |
31 | #define bfin_write_SDH_ARGUMENT bfin_write_RSI_ARGUMENT | |
32 | #define bfin_write_SDH_COMMAND bfin_write_RSI_COMMAND | |
33 | #define bfin_write_SDH_DATA_TIMER bfin_write_RSI_DATA_TIMER | |
34 | #define bfin_read_SDH_RESPONSE0 bfin_read_RSI_RESPONSE0 | |
35 | #define bfin_read_SDH_RESPONSE1 bfin_read_RSI_RESPONSE1 | |
36 | #define bfin_read_SDH_RESPONSE2 bfin_read_RSI_RESPONSE2 | |
37 | #define bfin_read_SDH_RESPONSE3 bfin_read_RSI_RESPONSE3 | |
38 | #define bfin_write_SDH_DATA_LGTH bfin_write_RSI_DATA_LGTH | |
39 | #define bfin_read_SDH_DATA_CTL bfin_read_RSI_DATA_CTL | |
40 | #define bfin_write_SDH_DATA_CTL bfin_write_RSI_DATA_CTL | |
41 | #define bfin_read_SDH_DATA_CNT bfin_read_RSI_DATA_CNT | |
42 | #define bfin_write_SDH_STATUS_CLR bfin_write_RSI_STATUS_CLR | |
43 | #define bfin_read_SDH_E_STATUS bfin_read_RSI_E_STATUS | |
44 | #define bfin_write_SDH_E_STATUS bfin_write_RSI_E_STATUS | |
45 | #define bfin_read_SDH_STATUS bfin_read_RSI_STATUS | |
46 | #define bfin_write_SDH_MASK0 bfin_write_RSI_MASK0 | |
47 | #define bfin_read_SDH_CFG bfin_read_RSI_CFG | |
48 | #define bfin_write_SDH_CFG bfin_write_RSI_CFG | |
49 | #endif | |
50 | ||
51 | struct dma_desc_array { | |
52 | unsigned long start_addr; | |
53 | unsigned short cfg; | |
54 | unsigned short x_count; | |
55 | short x_modify; | |
56 | } __packed; | |
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 int imask; | |
72 | unsigned int power_mode; | |
73 | unsigned int clk_div; | |
74 | ||
75 | struct mmc_request *mrq; | |
76 | struct mmc_command *cmd; | |
77 | struct mmc_data *data; | |
78 | }; | |
79 | ||
80 | static struct bfin_sd_host *get_sdh_data(struct platform_device *pdev) | |
81 | { | |
82 | return pdev->dev.platform_data; | |
83 | } | |
84 | ||
85 | static void sdh_stop_clock(struct sdh_host *host) | |
86 | { | |
87 | bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() & ~CLK_E); | |
88 | SSYNC(); | |
89 | } | |
90 | ||
91 | static void sdh_enable_stat_irq(struct sdh_host *host, unsigned int mask) | |
92 | { | |
93 | unsigned long flags; | |
94 | ||
95 | spin_lock_irqsave(&host->lock, flags); | |
96 | host->imask |= mask; | |
97 | bfin_write_SDH_MASK0(mask); | |
98 | SSYNC(); | |
99 | spin_unlock_irqrestore(&host->lock, flags); | |
100 | } | |
101 | ||
102 | static void sdh_disable_stat_irq(struct sdh_host *host, unsigned int mask) | |
103 | { | |
104 | unsigned long flags; | |
105 | ||
106 | spin_lock_irqsave(&host->lock, flags); | |
107 | host->imask &= ~mask; | |
108 | bfin_write_SDH_MASK0(host->imask); | |
109 | SSYNC(); | |
110 | spin_unlock_irqrestore(&host->lock, flags); | |
111 | } | |
112 | ||
113 | static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data) | |
114 | { | |
115 | unsigned int length; | |
116 | unsigned int data_ctl; | |
117 | unsigned int dma_cfg; | |
eb962d5b CC |
118 | |
119 | dev_dbg(mmc_dev(host->mmc), "%s enter flags: 0x%x\n", __func__, data->flags); | |
120 | host->data = data; | |
121 | data_ctl = 0; | |
122 | dma_cfg = 0; | |
123 | ||
124 | length = data->blksz * data->blocks; | |
125 | bfin_write_SDH_DATA_LGTH(length); | |
126 | ||
127 | if (data->flags & MMC_DATA_STREAM) | |
128 | data_ctl |= DTX_MODE; | |
129 | ||
130 | if (data->flags & MMC_DATA_READ) | |
131 | data_ctl |= DTX_DIR; | |
132 | /* Only supports power-of-2 block size */ | |
133 | if (data->blksz & (data->blksz - 1)) | |
134 | return -EINVAL; | |
135 | data_ctl |= ((ffs(data->blksz) - 1) << 4); | |
136 | ||
137 | bfin_write_SDH_DATA_CTL(data_ctl); | |
138 | ||
139 | bfin_write_SDH_DATA_TIMER(0xFFFF); | |
140 | SSYNC(); | |
141 | ||
142 | if (data->flags & MMC_DATA_READ) { | |
143 | host->dma_dir = DMA_FROM_DEVICE; | |
144 | dma_cfg |= WNR; | |
145 | } else | |
146 | host->dma_dir = DMA_TO_DEVICE; | |
147 | ||
148 | sdh_enable_stat_irq(host, (DAT_CRC_FAIL | DAT_TIME_OUT | DAT_END)); | |
149 | host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma_dir); | |
150 | #if defined(CONFIG_BF54x) | |
151 | dma_cfg |= DMAFLOW_ARRAY | NDSIZE_5 | RESTART | WDSIZE_32 | DMAEN; | |
152 | { | |
c744d988 | 153 | struct scatterlist *sg; |
eb962d5b CC |
154 | int i; |
155 | for_each_sg(data->sg, sg, host->dma_len, i) { | |
156 | host->sg_cpu[i].start_addr = sg_dma_address(sg); | |
157 | host->sg_cpu[i].cfg = dma_cfg; | |
158 | host->sg_cpu[i].x_count = sg_dma_len(sg) / 4; | |
159 | host->sg_cpu[i].x_modify = 4; | |
160 | dev_dbg(mmc_dev(host->mmc), "%d: start_addr:0x%lx, " | |
161 | "cfg:0x%x, x_count:0x%x, x_modify:0x%x\n", | |
162 | i, host->sg_cpu[i].start_addr, | |
163 | host->sg_cpu[i].cfg, host->sg_cpu[i].x_count, | |
164 | host->sg_cpu[i].x_modify); | |
165 | } | |
166 | } | |
167 | flush_dcache_range((unsigned int)host->sg_cpu, | |
168 | (unsigned int)host->sg_cpu + | |
169 | host->dma_len * sizeof(struct dma_desc_array)); | |
170 | /* Set the last descriptor to stop mode */ | |
171 | host->sg_cpu[host->dma_len - 1].cfg &= ~(DMAFLOW | NDSIZE); | |
172 | host->sg_cpu[host->dma_len - 1].cfg |= DI_EN; | |
173 | ||
174 | set_dma_curr_desc_addr(host->dma_ch, (unsigned long *)host->sg_dma); | |
175 | set_dma_x_count(host->dma_ch, 0); | |
176 | set_dma_x_modify(host->dma_ch, 0); | |
177 | set_dma_config(host->dma_ch, dma_cfg); | |
178 | #elif defined(CONFIG_BF51x) | |
179 | /* RSI DMA doesn't work in array mode */ | |
180 | dma_cfg |= WDSIZE_32 | DMAEN; | |
181 | set_dma_start_addr(host->dma_ch, sg_dma_address(&data->sg[0])); | |
182 | set_dma_x_count(host->dma_ch, length / 4); | |
183 | set_dma_x_modify(host->dma_ch, 4); | |
184 | set_dma_config(host->dma_ch, dma_cfg); | |
185 | #endif | |
186 | bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E); | |
187 | ||
188 | SSYNC(); | |
189 | ||
190 | dev_dbg(mmc_dev(host->mmc), "%s exit\n", __func__); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static void sdh_start_cmd(struct sdh_host *host, struct mmc_command *cmd) | |
195 | { | |
196 | unsigned int sdh_cmd; | |
197 | unsigned int stat_mask; | |
198 | ||
199 | dev_dbg(mmc_dev(host->mmc), "%s enter cmd: 0x%p\n", __func__, cmd); | |
200 | WARN_ON(host->cmd != NULL); | |
201 | host->cmd = cmd; | |
202 | ||
203 | sdh_cmd = 0; | |
204 | stat_mask = 0; | |
205 | ||
206 | sdh_cmd |= cmd->opcode; | |
207 | ||
208 | if (cmd->flags & MMC_RSP_PRESENT) { | |
209 | sdh_cmd |= CMD_RSP; | |
210 | stat_mask |= CMD_RESP_END; | |
211 | } else { | |
212 | stat_mask |= CMD_SENT; | |
213 | } | |
214 | ||
215 | if (cmd->flags & MMC_RSP_136) | |
216 | sdh_cmd |= CMD_L_RSP; | |
217 | ||
218 | stat_mask |= CMD_CRC_FAIL | CMD_TIME_OUT; | |
219 | ||
220 | sdh_enable_stat_irq(host, stat_mask); | |
221 | ||
222 | bfin_write_SDH_ARGUMENT(cmd->arg); | |
223 | bfin_write_SDH_COMMAND(sdh_cmd | CMD_E); | |
224 | bfin_write_SDH_CLK_CTL(bfin_read_SDH_CLK_CTL() | CLK_E); | |
225 | SSYNC(); | |
226 | } | |
227 | ||
228 | static void sdh_finish_request(struct sdh_host *host, struct mmc_request *mrq) | |
229 | { | |
230 | dev_dbg(mmc_dev(host->mmc), "%s enter\n", __func__); | |
231 | host->mrq = NULL; | |
232 | host->cmd = NULL; | |
233 | host->data = NULL; | |
234 | mmc_request_done(host->mmc, mrq); | |
235 | } | |
236 | ||
237 | static int sdh_cmd_done(struct sdh_host *host, unsigned int stat) | |
238 | { | |
239 | struct mmc_command *cmd = host->cmd; | |
240 | int ret = 0; | |
241 | ||
242 | dev_dbg(mmc_dev(host->mmc), "%s enter cmd: %p\n", __func__, cmd); | |
243 | if (!cmd) | |
244 | return 0; | |
245 | ||
246 | host->cmd = NULL; | |
247 | ||
248 | if (cmd->flags & MMC_RSP_PRESENT) { | |
249 | cmd->resp[0] = bfin_read_SDH_RESPONSE0(); | |
250 | if (cmd->flags & MMC_RSP_136) { | |
251 | cmd->resp[1] = bfin_read_SDH_RESPONSE1(); | |
252 | cmd->resp[2] = bfin_read_SDH_RESPONSE2(); | |
253 | cmd->resp[3] = bfin_read_SDH_RESPONSE3(); | |
254 | } | |
255 | } | |
256 | if (stat & CMD_TIME_OUT) | |
257 | cmd->error = -ETIMEDOUT; | |
258 | else if (stat & CMD_CRC_FAIL && cmd->flags & MMC_RSP_CRC) | |
259 | cmd->error = -EILSEQ; | |
260 | ||
261 | sdh_disable_stat_irq(host, (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL)); | |
262 | ||
263 | if (host->data && !cmd->error) { | |
264 | if (host->data->flags & MMC_DATA_WRITE) { | |
265 | ret = sdh_setup_data(host, host->data); | |
266 | if (ret) | |
267 | return 0; | |
268 | } | |
269 | ||
270 | sdh_enable_stat_irq(host, DAT_END | RX_OVERRUN | TX_UNDERRUN | DAT_TIME_OUT); | |
271 | } else | |
272 | sdh_finish_request(host, host->mrq); | |
273 | ||
274 | return 1; | |
275 | } | |
276 | ||
277 | static int sdh_data_done(struct sdh_host *host, unsigned int stat) | |
278 | { | |
279 | struct mmc_data *data = host->data; | |
280 | ||
281 | dev_dbg(mmc_dev(host->mmc), "%s enter stat: 0x%x\n", __func__, stat); | |
282 | if (!data) | |
283 | return 0; | |
284 | ||
285 | disable_dma(host->dma_ch); | |
286 | dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, | |
287 | host->dma_dir); | |
288 | ||
289 | if (stat & DAT_TIME_OUT) | |
290 | data->error = -ETIMEDOUT; | |
291 | else if (stat & DAT_CRC_FAIL) | |
292 | data->error = -EILSEQ; | |
293 | else if (stat & (RX_OVERRUN | TX_UNDERRUN)) | |
294 | data->error = -EIO; | |
295 | ||
296 | if (!data->error) | |
297 | data->bytes_xfered = data->blocks * data->blksz; | |
298 | else | |
299 | data->bytes_xfered = 0; | |
300 | ||
301 | sdh_disable_stat_irq(host, DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN); | |
302 | bfin_write_SDH_STATUS_CLR(DAT_END_STAT | DAT_TIMEOUT_STAT | \ | |
303 | DAT_CRC_FAIL_STAT | DAT_BLK_END_STAT | RX_OVERRUN | TX_UNDERRUN); | |
304 | bfin_write_SDH_DATA_CTL(0); | |
305 | SSYNC(); | |
306 | ||
307 | host->data = NULL; | |
308 | if (host->mrq->stop) { | |
309 | sdh_stop_clock(host); | |
310 | sdh_start_cmd(host, host->mrq->stop); | |
311 | } else { | |
312 | sdh_finish_request(host, host->mrq); | |
313 | } | |
314 | ||
315 | return 1; | |
316 | } | |
317 | ||
318 | static void sdh_request(struct mmc_host *mmc, struct mmc_request *mrq) | |
319 | { | |
320 | struct sdh_host *host = mmc_priv(mmc); | |
321 | int ret = 0; | |
322 | ||
323 | dev_dbg(mmc_dev(host->mmc), "%s enter, mrp:%p, cmd:%p\n", __func__, mrq, mrq->cmd); | |
324 | WARN_ON(host->mrq != NULL); | |
325 | ||
326 | host->mrq = mrq; | |
327 | host->data = mrq->data; | |
328 | ||
329 | if (mrq->data && mrq->data->flags & MMC_DATA_READ) { | |
330 | ret = sdh_setup_data(host, mrq->data); | |
331 | if (ret) | |
332 | return; | |
333 | } | |
334 | ||
335 | sdh_start_cmd(host, mrq->cmd); | |
336 | } | |
337 | ||
338 | static void sdh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
339 | { | |
340 | struct sdh_host *host; | |
341 | unsigned long flags; | |
342 | u16 clk_ctl = 0; | |
343 | u16 pwr_ctl = 0; | |
344 | u16 cfg; | |
345 | host = mmc_priv(mmc); | |
346 | ||
347 | spin_lock_irqsave(&host->lock, flags); | |
348 | if (ios->clock) { | |
349 | unsigned long sys_clk, ios_clk; | |
350 | unsigned char clk_div; | |
351 | ios_clk = 2 * ios->clock; | |
352 | sys_clk = get_sclk(); | |
353 | clk_div = sys_clk / ios_clk; | |
354 | if (sys_clk % ios_clk == 0) | |
355 | clk_div -= 1; | |
356 | clk_div = min_t(unsigned char, clk_div, 0xFF); | |
357 | clk_ctl |= clk_div; | |
358 | clk_ctl |= CLK_E; | |
359 | host->clk_div = clk_div; | |
360 | } else | |
361 | sdh_stop_clock(host); | |
362 | ||
363 | if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) | |
364 | #ifdef CONFIG_SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND | |
365 | pwr_ctl |= ROD_CTL; | |
366 | #else | |
367 | pwr_ctl |= SD_CMD_OD | ROD_CTL; | |
368 | #endif | |
369 | ||
370 | if (ios->bus_width == MMC_BUS_WIDTH_4) { | |
371 | cfg = bfin_read_SDH_CFG(); | |
372 | cfg &= ~PD_SDDAT3; | |
373 | cfg |= PUP_SDDAT3; | |
374 | /* Enable 4 bit SDIO */ | |
375 | cfg |= (SD4E | MWE); | |
376 | bfin_write_SDH_CFG(cfg); | |
377 | clk_ctl |= WIDE_BUS; | |
378 | } else { | |
379 | cfg = bfin_read_SDH_CFG(); | |
380 | cfg |= MWE; | |
381 | bfin_write_SDH_CFG(cfg); | |
382 | } | |
383 | ||
384 | bfin_write_SDH_CLK_CTL(clk_ctl); | |
385 | ||
386 | host->power_mode = ios->power_mode; | |
387 | if (ios->power_mode == MMC_POWER_ON) | |
388 | pwr_ctl |= PWR_ON; | |
389 | ||
390 | bfin_write_SDH_PWR_CTL(pwr_ctl); | |
391 | SSYNC(); | |
392 | ||
393 | spin_unlock_irqrestore(&host->lock, flags); | |
394 | ||
395 | dev_dbg(mmc_dev(host->mmc), "SDH: clk_div = 0x%x actual clock:%ld expected clock:%d\n", | |
396 | host->clk_div, | |
397 | host->clk_div ? get_sclk() / (2 * (host->clk_div + 1)) : 0, | |
398 | ios->clock); | |
399 | } | |
400 | ||
401 | static const struct mmc_host_ops sdh_ops = { | |
402 | .request = sdh_request, | |
403 | .set_ios = sdh_set_ios, | |
404 | }; | |
405 | ||
406 | static irqreturn_t sdh_dma_irq(int irq, void *devid) | |
407 | { | |
408 | struct sdh_host *host = devid; | |
409 | ||
410 | dev_dbg(mmc_dev(host->mmc), "%s enter, irq_stat: 0x%04x\n", __func__, | |
411 | get_dma_curr_irqstat(host->dma_ch)); | |
412 | clear_dma_irqstat(host->dma_ch); | |
413 | SSYNC(); | |
414 | ||
415 | return IRQ_HANDLED; | |
416 | } | |
417 | ||
418 | static irqreturn_t sdh_stat_irq(int irq, void *devid) | |
419 | { | |
420 | struct sdh_host *host = devid; | |
421 | unsigned int status; | |
422 | int handled = 0; | |
423 | ||
424 | dev_dbg(mmc_dev(host->mmc), "%s enter\n", __func__); | |
425 | status = bfin_read_SDH_E_STATUS(); | |
426 | if (status & SD_CARD_DET) { | |
427 | mmc_detect_change(host->mmc, 0); | |
428 | bfin_write_SDH_E_STATUS(SD_CARD_DET); | |
429 | } | |
430 | status = bfin_read_SDH_STATUS(); | |
431 | if (status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL)) { | |
432 | handled |= sdh_cmd_done(host, status); | |
433 | bfin_write_SDH_STATUS_CLR(CMD_SENT_STAT | CMD_RESP_END_STAT | \ | |
434 | CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT); | |
435 | SSYNC(); | |
436 | } | |
437 | ||
438 | status = bfin_read_SDH_STATUS(); | |
439 | if (status & (DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN | TX_UNDERRUN)) | |
440 | handled |= sdh_data_done(host, status); | |
441 | ||
442 | dev_dbg(mmc_dev(host->mmc), "%s exit\n\n", __func__); | |
443 | ||
444 | return IRQ_RETVAL(handled); | |
445 | } | |
446 | ||
447 | static int __devinit sdh_probe(struct platform_device *pdev) | |
448 | { | |
449 | struct mmc_host *mmc; | |
450 | struct sdh_host *host; | |
451 | struct bfin_sd_host *drv_data = get_sdh_data(pdev); | |
452 | int ret; | |
453 | ||
454 | if (!drv_data) { | |
455 | dev_err(&pdev->dev, "missing platform driver data\n"); | |
456 | ret = -EINVAL; | |
457 | goto out; | |
458 | } | |
459 | ||
460 | mmc = mmc_alloc_host(sizeof(*mmc), &pdev->dev); | |
461 | if (!mmc) { | |
462 | ret = -ENOMEM; | |
463 | goto out; | |
464 | } | |
465 | ||
466 | mmc->ops = &sdh_ops; | |
467 | mmc->max_phys_segs = 32; | |
468 | mmc->max_seg_size = 1 << 16; | |
469 | mmc->max_blk_size = 1 << 11; | |
470 | mmc->max_blk_count = 1 << 11; | |
471 | mmc->max_req_size = PAGE_SIZE; | |
472 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; | |
473 | mmc->f_max = get_sclk(); | |
474 | mmc->f_min = mmc->f_max >> 9; | |
475 | mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_NEEDS_POLL; | |
476 | host = mmc_priv(mmc); | |
477 | host->mmc = mmc; | |
478 | ||
479 | spin_lock_init(&host->lock); | |
480 | host->irq = drv_data->irq_int0; | |
481 | host->dma_ch = drv_data->dma_chan; | |
482 | ||
483 | ret = request_dma(host->dma_ch, DRIVER_NAME "DMA"); | |
484 | if (ret) { | |
485 | dev_err(&pdev->dev, "unable to request DMA channel\n"); | |
486 | goto out1; | |
487 | } | |
488 | ||
489 | ret = set_dma_callback(host->dma_ch, sdh_dma_irq, host); | |
490 | if (ret) { | |
491 | dev_err(&pdev->dev, "unable to request DMA irq\n"); | |
492 | goto out2; | |
493 | } | |
494 | ||
495 | host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL); | |
496 | if (host->sg_cpu == NULL) { | |
497 | ret = -ENOMEM; | |
498 | goto out2; | |
499 | } | |
500 | ||
501 | platform_set_drvdata(pdev, mmc); | |
502 | mmc_add_host(mmc); | |
503 | ||
504 | ret = request_irq(host->irq, sdh_stat_irq, 0, "SDH Status IRQ", host); | |
505 | if (ret) { | |
506 | dev_err(&pdev->dev, "unable to request status irq\n"); | |
507 | goto out3; | |
508 | } | |
509 | ||
510 | ret = peripheral_request_list(drv_data->pin_req, DRIVER_NAME); | |
511 | if (ret) { | |
512 | dev_err(&pdev->dev, "unable to request peripheral pins\n"); | |
513 | goto out4; | |
514 | } | |
515 | #if defined(CONFIG_BF54x) | |
516 | /* Secure Digital Host shares DMA with Nand controller */ | |
517 | bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1); | |
518 | #endif | |
519 | ||
520 | bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN); | |
521 | SSYNC(); | |
522 | ||
523 | /* Disable card inserting detection pin. set MMC_CAP_NEES_POLL, and | |
524 | * mmc stack will do the detection. | |
525 | */ | |
526 | bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3)); | |
527 | SSYNC(); | |
528 | ||
529 | return 0; | |
530 | ||
531 | out4: | |
532 | free_irq(host->irq, host); | |
533 | out3: | |
534 | mmc_remove_host(mmc); | |
535 | dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma); | |
536 | out2: | |
537 | free_dma(host->dma_ch); | |
538 | out1: | |
539 | mmc_free_host(mmc); | |
540 | out: | |
541 | return ret; | |
542 | } | |
543 | ||
544 | static int __devexit sdh_remove(struct platform_device *pdev) | |
545 | { | |
546 | struct mmc_host *mmc = platform_get_drvdata(pdev); | |
547 | ||
548 | platform_set_drvdata(pdev, NULL); | |
549 | ||
550 | if (mmc) { | |
551 | struct sdh_host *host = mmc_priv(mmc); | |
552 | ||
553 | mmc_remove_host(mmc); | |
554 | ||
555 | sdh_stop_clock(host); | |
556 | free_irq(host->irq, host); | |
557 | free_dma(host->dma_ch); | |
558 | dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma); | |
559 | ||
560 | mmc_free_host(mmc); | |
561 | } | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | #ifdef CONFIG_PM | |
567 | static int sdh_suspend(struct platform_device *dev, pm_message_t state) | |
568 | { | |
569 | struct mmc_host *mmc = platform_get_drvdata(dev); | |
570 | struct bfin_sd_host *drv_data = get_sdh_data(dev); | |
571 | int ret = 0; | |
572 | ||
573 | if (mmc) | |
574 | ret = mmc_suspend_host(mmc, state); | |
575 | ||
576 | bfin_write_SDH_PWR_CTL(bfin_read_SDH_PWR_CTL() & ~PWR_ON); | |
577 | peripheral_free_list(drv_data->pin_req); | |
578 | ||
579 | return ret; | |
580 | } | |
581 | ||
582 | static int sdh_resume(struct platform_device *dev) | |
583 | { | |
584 | struct mmc_host *mmc = platform_get_drvdata(dev); | |
585 | struct bfin_sd_host *drv_data = get_sdh_data(dev); | |
586 | int ret = 0; | |
587 | ||
588 | ret = peripheral_request_list(drv_data->pin_req, DRIVER_NAME); | |
589 | if (ret) { | |
590 | dev_err(&dev->dev, "unable to request peripheral pins\n"); | |
591 | return ret; | |
592 | } | |
593 | ||
594 | bfin_write_SDH_PWR_CTL(bfin_read_SDH_PWR_CTL() | PWR_ON); | |
595 | #if defined(CONFIG_BF54x) | |
596 | /* Secure Digital Host shares DMA with Nand controller */ | |
597 | bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1); | |
598 | #endif | |
599 | bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN); | |
600 | SSYNC(); | |
601 | ||
602 | bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | (PUP_SDDAT | PUP_SDDAT3)); | |
603 | SSYNC(); | |
604 | ||
605 | if (mmc) | |
606 | ret = mmc_resume_host(mmc); | |
607 | ||
608 | return ret; | |
609 | } | |
610 | #else | |
611 | # define sdh_suspend NULL | |
612 | # define sdh_resume NULL | |
613 | #endif | |
614 | ||
615 | static struct platform_driver sdh_driver = { | |
616 | .probe = sdh_probe, | |
617 | .remove = __devexit_p(sdh_remove), | |
618 | .suspend = sdh_suspend, | |
619 | .resume = sdh_resume, | |
620 | .driver = { | |
621 | .name = DRIVER_NAME, | |
622 | }, | |
623 | }; | |
624 | ||
625 | static int __init sdh_init(void) | |
626 | { | |
627 | return platform_driver_register(&sdh_driver); | |
628 | } | |
629 | module_init(sdh_init); | |
630 | ||
631 | static void __exit sdh_exit(void) | |
632 | { | |
633 | platform_driver_unregister(&sdh_driver); | |
634 | } | |
635 | module_exit(sdh_exit); | |
636 | ||
637 | MODULE_DESCRIPTION("Blackfin Secure Digital Host Driver"); | |
638 | MODULE_AUTHOR("Cliff Cai, Roy Huang"); | |
639 | MODULE_LICENSE("GPL"); |