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d96be879 SH |
1 | /* |
2 | * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver | |
3 | * | |
4 | * This is a driver for the SDHC controller found in Freescale MX2/MX3 | |
5 | * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c). | |
6 | * Unlike the hardware found on MX1, this hardware just works and does | |
7 | * not need all the quirks found in imxmmc.c, hence the seperate driver. | |
8 | * | |
9 | * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> | |
10 | * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com> | |
11 | * | |
12 | * derived from pxamci.c by Russell King | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License version 2 as | |
16 | * published by the Free Software Foundation. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/ioport.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/dma-mapping.h> | |
28 | #include <linux/mmc/host.h> | |
29 | #include <linux/mmc/card.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/clk.h> | |
32 | #include <linux/io.h> | |
33 | #include <linux/gpio.h> | |
34 | ||
35 | #include <asm/dma.h> | |
36 | #include <asm/irq.h> | |
37 | #include <asm/sizes.h> | |
38 | #include <mach/mmc.h> | |
39 | ||
40 | #ifdef CONFIG_ARCH_MX2 | |
41 | #include <mach/dma-mx1-mx2.h> | |
42 | #define HAS_DMA | |
43 | #endif | |
44 | ||
9563b1db | 45 | #define DRIVER_NAME "mxc-mmc" |
d96be879 SH |
46 | |
47 | #define MMC_REG_STR_STP_CLK 0x00 | |
48 | #define MMC_REG_STATUS 0x04 | |
49 | #define MMC_REG_CLK_RATE 0x08 | |
50 | #define MMC_REG_CMD_DAT_CONT 0x0C | |
51 | #define MMC_REG_RES_TO 0x10 | |
52 | #define MMC_REG_READ_TO 0x14 | |
53 | #define MMC_REG_BLK_LEN 0x18 | |
54 | #define MMC_REG_NOB 0x1C | |
55 | #define MMC_REG_REV_NO 0x20 | |
56 | #define MMC_REG_INT_CNTR 0x24 | |
57 | #define MMC_REG_CMD 0x28 | |
58 | #define MMC_REG_ARG 0x2C | |
59 | #define MMC_REG_RES_FIFO 0x34 | |
60 | #define MMC_REG_BUFFER_ACCESS 0x38 | |
61 | ||
62 | #define STR_STP_CLK_RESET (1 << 3) | |
63 | #define STR_STP_CLK_START_CLK (1 << 1) | |
64 | #define STR_STP_CLK_STOP_CLK (1 << 0) | |
65 | ||
66 | #define STATUS_CARD_INSERTION (1 << 31) | |
67 | #define STATUS_CARD_REMOVAL (1 << 30) | |
68 | #define STATUS_YBUF_EMPTY (1 << 29) | |
69 | #define STATUS_XBUF_EMPTY (1 << 28) | |
70 | #define STATUS_YBUF_FULL (1 << 27) | |
71 | #define STATUS_XBUF_FULL (1 << 26) | |
72 | #define STATUS_BUF_UND_RUN (1 << 25) | |
73 | #define STATUS_BUF_OVFL (1 << 24) | |
74 | #define STATUS_SDIO_INT_ACTIVE (1 << 14) | |
75 | #define STATUS_END_CMD_RESP (1 << 13) | |
76 | #define STATUS_WRITE_OP_DONE (1 << 12) | |
77 | #define STATUS_DATA_TRANS_DONE (1 << 11) | |
78 | #define STATUS_READ_OP_DONE (1 << 11) | |
79 | #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) | |
80 | #define STATUS_CARD_BUS_CLK_RUN (1 << 8) | |
81 | #define STATUS_BUF_READ_RDY (1 << 7) | |
82 | #define STATUS_BUF_WRITE_RDY (1 << 6) | |
83 | #define STATUS_RESP_CRC_ERR (1 << 5) | |
84 | #define STATUS_CRC_READ_ERR (1 << 3) | |
85 | #define STATUS_CRC_WRITE_ERR (1 << 2) | |
86 | #define STATUS_TIME_OUT_RESP (1 << 1) | |
87 | #define STATUS_TIME_OUT_READ (1 << 0) | |
88 | #define STATUS_ERR_MASK 0x2f | |
89 | ||
90 | #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) | |
91 | #define CMD_DAT_CONT_STOP_READWAIT (1 << 11) | |
92 | #define CMD_DAT_CONT_START_READWAIT (1 << 10) | |
93 | #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) | |
94 | #define CMD_DAT_CONT_INIT (1 << 7) | |
95 | #define CMD_DAT_CONT_WRITE (1 << 4) | |
96 | #define CMD_DAT_CONT_DATA_ENABLE (1 << 3) | |
97 | #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) | |
98 | #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) | |
99 | #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) | |
100 | ||
101 | #define INT_SDIO_INT_WKP_EN (1 << 18) | |
102 | #define INT_CARD_INSERTION_WKP_EN (1 << 17) | |
103 | #define INT_CARD_REMOVAL_WKP_EN (1 << 16) | |
104 | #define INT_CARD_INSERTION_EN (1 << 15) | |
105 | #define INT_CARD_REMOVAL_EN (1 << 14) | |
106 | #define INT_SDIO_IRQ_EN (1 << 13) | |
107 | #define INT_DAT0_EN (1 << 12) | |
108 | #define INT_BUF_READ_EN (1 << 4) | |
109 | #define INT_BUF_WRITE_EN (1 << 3) | |
110 | #define INT_END_CMD_RES_EN (1 << 2) | |
111 | #define INT_WRITE_OP_DONE_EN (1 << 1) | |
112 | #define INT_READ_OP_EN (1 << 0) | |
113 | ||
114 | struct mxcmci_host { | |
115 | struct mmc_host *mmc; | |
116 | struct resource *res; | |
117 | void __iomem *base; | |
118 | int irq; | |
119 | int detect_irq; | |
120 | int dma; | |
121 | int do_dma; | |
122 | unsigned int power_mode; | |
123 | struct imxmmc_platform_data *pdata; | |
124 | ||
125 | struct mmc_request *req; | |
126 | struct mmc_command *cmd; | |
127 | struct mmc_data *data; | |
128 | ||
129 | unsigned int dma_nents; | |
130 | unsigned int datasize; | |
131 | unsigned int dma_dir; | |
132 | ||
133 | u16 rev_no; | |
134 | unsigned int cmdat; | |
135 | ||
136 | struct clk *clk; | |
137 | ||
138 | int clock; | |
139 | ||
140 | struct work_struct datawork; | |
141 | }; | |
142 | ||
143 | static inline int mxcmci_use_dma(struct mxcmci_host *host) | |
144 | { | |
145 | return host->do_dma; | |
146 | } | |
147 | ||
148 | static void mxcmci_softreset(struct mxcmci_host *host) | |
149 | { | |
150 | int i; | |
151 | ||
152 | /* reset sequence */ | |
153 | writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK); | |
154 | writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, | |
155 | host->base + MMC_REG_STR_STP_CLK); | |
156 | ||
157 | for (i = 0; i < 8; i++) | |
158 | writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); | |
159 | ||
160 | writew(0xff, host->base + MMC_REG_RES_TO); | |
161 | } | |
162 | ||
163 | static void mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) | |
164 | { | |
165 | unsigned int nob = data->blocks; | |
166 | unsigned int blksz = data->blksz; | |
167 | unsigned int datasize = nob * blksz; | |
168 | #ifdef HAS_DMA | |
169 | struct scatterlist *sg; | |
170 | int i; | |
171 | #endif | |
172 | if (data->flags & MMC_DATA_STREAM) | |
173 | nob = 0xffff; | |
174 | ||
175 | host->data = data; | |
176 | data->bytes_xfered = 0; | |
177 | ||
178 | writew(nob, host->base + MMC_REG_NOB); | |
179 | writew(blksz, host->base + MMC_REG_BLK_LEN); | |
180 | host->datasize = datasize; | |
181 | ||
182 | #ifdef HAS_DMA | |
183 | for_each_sg(data->sg, sg, data->sg_len, i) { | |
184 | if (sg->offset & 3 || sg->length & 3) { | |
185 | host->do_dma = 0; | |
186 | return; | |
187 | } | |
188 | } | |
189 | ||
190 | if (data->flags & MMC_DATA_READ) { | |
191 | host->dma_dir = DMA_FROM_DEVICE; | |
192 | host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg, | |
193 | data->sg_len, host->dma_dir); | |
194 | ||
195 | imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize, | |
196 | host->res->start + MMC_REG_BUFFER_ACCESS, | |
197 | DMA_MODE_READ); | |
198 | } else { | |
199 | host->dma_dir = DMA_TO_DEVICE; | |
200 | host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg, | |
201 | data->sg_len, host->dma_dir); | |
202 | ||
203 | imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, datasize, | |
204 | host->res->start + MMC_REG_BUFFER_ACCESS, | |
205 | DMA_MODE_WRITE); | |
206 | } | |
207 | ||
208 | wmb(); | |
209 | ||
210 | imx_dma_enable(host->dma); | |
211 | #endif /* HAS_DMA */ | |
212 | } | |
213 | ||
214 | static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, | |
215 | unsigned int cmdat) | |
216 | { | |
217 | WARN_ON(host->cmd != NULL); | |
218 | host->cmd = cmd; | |
219 | ||
220 | switch (mmc_resp_type(cmd)) { | |
221 | case MMC_RSP_R1: /* short CRC, OPCODE */ | |
222 | case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ | |
223 | cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; | |
224 | break; | |
225 | case MMC_RSP_R2: /* long 136 bit + CRC */ | |
226 | cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; | |
227 | break; | |
228 | case MMC_RSP_R3: /* short */ | |
229 | cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; | |
230 | break; | |
231 | case MMC_RSP_NONE: | |
232 | break; | |
233 | default: | |
234 | dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", | |
235 | mmc_resp_type(cmd)); | |
236 | cmd->error = -EINVAL; | |
237 | return -EINVAL; | |
238 | } | |
239 | ||
240 | if (mxcmci_use_dma(host)) | |
241 | writel(INT_READ_OP_EN | INT_WRITE_OP_DONE_EN | | |
242 | INT_END_CMD_RES_EN, | |
243 | host->base + MMC_REG_INT_CNTR); | |
244 | else | |
245 | writel(INT_END_CMD_RES_EN, host->base + MMC_REG_INT_CNTR); | |
246 | ||
247 | writew(cmd->opcode, host->base + MMC_REG_CMD); | |
248 | writel(cmd->arg, host->base + MMC_REG_ARG); | |
249 | writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static void mxcmci_finish_request(struct mxcmci_host *host, | |
255 | struct mmc_request *req) | |
256 | { | |
257 | writel(0, host->base + MMC_REG_INT_CNTR); | |
258 | ||
259 | host->req = NULL; | |
260 | host->cmd = NULL; | |
261 | host->data = NULL; | |
262 | ||
263 | mmc_request_done(host->mmc, req); | |
264 | } | |
265 | ||
266 | static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) | |
267 | { | |
268 | struct mmc_data *data = host->data; | |
269 | int data_error; | |
270 | ||
271 | #ifdef HAS_DMA | |
272 | if (mxcmci_use_dma(host)) { | |
273 | imx_dma_disable(host->dma); | |
274 | dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents, | |
275 | host->dma_dir); | |
276 | } | |
277 | #endif | |
278 | ||
279 | if (stat & STATUS_ERR_MASK) { | |
280 | dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", | |
281 | stat); | |
282 | if (stat & STATUS_CRC_READ_ERR) { | |
283 | data->error = -EILSEQ; | |
284 | } else if (stat & STATUS_CRC_WRITE_ERR) { | |
285 | u32 err_code = (stat >> 9) & 0x3; | |
286 | if (err_code == 2) /* No CRC response */ | |
287 | data->error = -ETIMEDOUT; | |
288 | else | |
289 | data->error = -EILSEQ; | |
290 | } else if (stat & STATUS_TIME_OUT_READ) { | |
291 | data->error = -ETIMEDOUT; | |
292 | } else { | |
293 | data->error = -EIO; | |
294 | } | |
295 | } else { | |
296 | data->bytes_xfered = host->datasize; | |
297 | } | |
298 | ||
299 | data_error = data->error; | |
300 | ||
301 | host->data = NULL; | |
302 | ||
303 | return data_error; | |
304 | } | |
305 | ||
306 | static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) | |
307 | { | |
308 | struct mmc_command *cmd = host->cmd; | |
309 | int i; | |
310 | u32 a, b, c; | |
311 | ||
312 | if (!cmd) | |
313 | return; | |
314 | ||
315 | if (stat & STATUS_TIME_OUT_RESP) { | |
316 | dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); | |
317 | cmd->error = -ETIMEDOUT; | |
318 | } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { | |
319 | dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); | |
320 | cmd->error = -EILSEQ; | |
321 | } | |
322 | ||
323 | if (cmd->flags & MMC_RSP_PRESENT) { | |
324 | if (cmd->flags & MMC_RSP_136) { | |
325 | for (i = 0; i < 4; i++) { | |
326 | a = readw(host->base + MMC_REG_RES_FIFO); | |
327 | b = readw(host->base + MMC_REG_RES_FIFO); | |
328 | cmd->resp[i] = a << 16 | b; | |
329 | } | |
330 | } else { | |
331 | a = readw(host->base + MMC_REG_RES_FIFO); | |
332 | b = readw(host->base + MMC_REG_RES_FIFO); | |
333 | c = readw(host->base + MMC_REG_RES_FIFO); | |
334 | cmd->resp[0] = a << 24 | b << 8 | c >> 8; | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
339 | static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) | |
340 | { | |
341 | u32 stat; | |
342 | unsigned long timeout = jiffies + HZ; | |
343 | ||
344 | do { | |
345 | stat = readl(host->base + MMC_REG_STATUS); | |
346 | if (stat & STATUS_ERR_MASK) | |
347 | return stat; | |
348 | if (time_after(jiffies, timeout)) | |
349 | return STATUS_TIME_OUT_READ; | |
350 | if (stat & mask) | |
351 | return 0; | |
352 | cpu_relax(); | |
353 | } while (1); | |
354 | } | |
355 | ||
356 | static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) | |
357 | { | |
358 | unsigned int stat; | |
359 | u32 *buf = _buf; | |
360 | ||
361 | while (bytes > 3) { | |
362 | stat = mxcmci_poll_status(host, | |
363 | STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); | |
364 | if (stat) | |
365 | return stat; | |
366 | *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS); | |
367 | bytes -= 4; | |
368 | } | |
369 | ||
370 | if (bytes) { | |
371 | u8 *b = (u8 *)buf; | |
372 | u32 tmp; | |
373 | ||
374 | stat = mxcmci_poll_status(host, | |
375 | STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); | |
376 | if (stat) | |
377 | return stat; | |
378 | tmp = readl(host->base + MMC_REG_BUFFER_ACCESS); | |
379 | memcpy(b, &tmp, bytes); | |
380 | } | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) | |
386 | { | |
387 | unsigned int stat; | |
388 | u32 *buf = _buf; | |
389 | ||
390 | while (bytes > 3) { | |
391 | stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); | |
392 | if (stat) | |
393 | return stat; | |
394 | writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS); | |
395 | bytes -= 4; | |
396 | } | |
397 | ||
398 | if (bytes) { | |
399 | u8 *b = (u8 *)buf; | |
400 | u32 tmp; | |
401 | ||
402 | stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); | |
403 | if (stat) | |
404 | return stat; | |
405 | ||
406 | memcpy(&tmp, b, bytes); | |
407 | writel(tmp, host->base + MMC_REG_BUFFER_ACCESS); | |
408 | } | |
409 | ||
410 | stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); | |
411 | if (stat) | |
412 | return stat; | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static int mxcmci_transfer_data(struct mxcmci_host *host) | |
418 | { | |
419 | struct mmc_data *data = host->req->data; | |
420 | struct scatterlist *sg; | |
421 | int stat, i; | |
422 | ||
423 | host->datasize = 0; | |
424 | ||
425 | host->data = data; | |
426 | host->datasize = 0; | |
427 | ||
428 | if (data->flags & MMC_DATA_READ) { | |
429 | for_each_sg(data->sg, sg, data->sg_len, i) { | |
430 | stat = mxcmci_pull(host, sg_virt(sg), sg->length); | |
431 | if (stat) | |
432 | return stat; | |
433 | host->datasize += sg->length; | |
434 | } | |
435 | } else { | |
436 | for_each_sg(data->sg, sg, data->sg_len, i) { | |
437 | stat = mxcmci_push(host, sg_virt(sg), sg->length); | |
438 | if (stat) | |
439 | return stat; | |
440 | host->datasize += sg->length; | |
441 | } | |
442 | stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); | |
443 | if (stat) | |
444 | return stat; | |
445 | } | |
446 | return 0; | |
447 | } | |
448 | ||
449 | static void mxcmci_datawork(struct work_struct *work) | |
450 | { | |
451 | struct mxcmci_host *host = container_of(work, struct mxcmci_host, | |
452 | datawork); | |
453 | int datastat = mxcmci_transfer_data(host); | |
454 | mxcmci_finish_data(host, datastat); | |
455 | ||
456 | if (host->req->stop) { | |
457 | if (mxcmci_start_cmd(host, host->req->stop, 0)) { | |
458 | mxcmci_finish_request(host, host->req); | |
459 | return; | |
460 | } | |
461 | } else { | |
462 | mxcmci_finish_request(host, host->req); | |
463 | } | |
464 | } | |
465 | ||
466 | #ifdef HAS_DMA | |
467 | static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) | |
468 | { | |
469 | struct mmc_data *data = host->data; | |
470 | int data_error; | |
471 | ||
472 | if (!data) | |
473 | return; | |
474 | ||
475 | data_error = mxcmci_finish_data(host, stat); | |
476 | ||
477 | mxcmci_read_response(host, stat); | |
478 | host->cmd = NULL; | |
479 | ||
480 | if (host->req->stop) { | |
481 | if (mxcmci_start_cmd(host, host->req->stop, 0)) { | |
482 | mxcmci_finish_request(host, host->req); | |
483 | return; | |
484 | } | |
485 | } else { | |
486 | mxcmci_finish_request(host, host->req); | |
487 | } | |
488 | } | |
489 | #endif /* HAS_DMA */ | |
490 | ||
491 | static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) | |
492 | { | |
493 | mxcmci_read_response(host, stat); | |
494 | host->cmd = NULL; | |
495 | ||
496 | if (!host->data && host->req) { | |
497 | mxcmci_finish_request(host, host->req); | |
498 | return; | |
499 | } | |
500 | ||
501 | /* For the DMA case the DMA engine handles the data transfer | |
502 | * automatically. For non DMA we have to to it ourselves. | |
503 | * Don't do it in interrupt context though. | |
504 | */ | |
505 | if (!mxcmci_use_dma(host) && host->data) | |
506 | schedule_work(&host->datawork); | |
507 | ||
508 | } | |
509 | ||
510 | static irqreturn_t mxcmci_irq(int irq, void *devid) | |
511 | { | |
512 | struct mxcmci_host *host = devid; | |
513 | u32 stat; | |
514 | ||
515 | stat = readl(host->base + MMC_REG_STATUS); | |
516 | writel(stat, host->base + MMC_REG_STATUS); | |
517 | ||
518 | dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); | |
519 | ||
520 | if (stat & STATUS_END_CMD_RESP) | |
521 | mxcmci_cmd_done(host, stat); | |
522 | #ifdef HAS_DMA | |
523 | if (mxcmci_use_dma(host) && | |
524 | (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) | |
525 | mxcmci_data_done(host, stat); | |
526 | #endif | |
527 | return IRQ_HANDLED; | |
528 | } | |
529 | ||
530 | static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) | |
531 | { | |
532 | struct mxcmci_host *host = mmc_priv(mmc); | |
533 | unsigned int cmdat = host->cmdat; | |
534 | ||
535 | WARN_ON(host->req != NULL); | |
536 | ||
537 | host->req = req; | |
538 | host->cmdat &= ~CMD_DAT_CONT_INIT; | |
539 | #ifdef HAS_DMA | |
540 | host->do_dma = 1; | |
541 | #endif | |
542 | if (req->data) { | |
543 | mxcmci_setup_data(host, req->data); | |
544 | ||
545 | cmdat |= CMD_DAT_CONT_DATA_ENABLE; | |
546 | ||
547 | if (req->data->flags & MMC_DATA_WRITE) | |
548 | cmdat |= CMD_DAT_CONT_WRITE; | |
549 | } | |
550 | ||
551 | if (mxcmci_start_cmd(host, req->cmd, cmdat)) | |
552 | mxcmci_finish_request(host, req); | |
553 | } | |
554 | ||
555 | static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) | |
556 | { | |
557 | unsigned int divider; | |
558 | int prescaler = 0; | |
559 | unsigned int clk_in = clk_get_rate(host->clk); | |
560 | ||
561 | while (prescaler <= 0x800) { | |
562 | for (divider = 1; divider <= 0xF; divider++) { | |
563 | int x; | |
564 | ||
565 | x = (clk_in / (divider + 1)); | |
566 | ||
567 | if (prescaler) | |
568 | x /= (prescaler * 2); | |
569 | ||
570 | if (x <= clk_ios) | |
571 | break; | |
572 | } | |
573 | if (divider < 0x10) | |
574 | break; | |
575 | ||
576 | if (prescaler == 0) | |
577 | prescaler = 1; | |
578 | else | |
579 | prescaler <<= 1; | |
580 | } | |
581 | ||
582 | writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE); | |
583 | ||
584 | dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", | |
585 | prescaler, divider, clk_in, clk_ios); | |
586 | } | |
587 | ||
588 | static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
589 | { | |
590 | struct mxcmci_host *host = mmc_priv(mmc); | |
591 | #ifdef HAS_DMA | |
592 | unsigned int blen; | |
593 | /* | |
594 | * use burstlen of 64 in 4 bit mode (--> reg value 0) | |
595 | * use burstlen of 16 in 1 bit mode (--> reg value 16) | |
596 | */ | |
597 | if (ios->bus_width == MMC_BUS_WIDTH_4) | |
598 | blen = 0; | |
599 | else | |
600 | blen = 16; | |
601 | ||
602 | imx_dma_config_burstlen(host->dma, blen); | |
603 | #endif | |
604 | if (ios->bus_width == MMC_BUS_WIDTH_4) | |
605 | host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; | |
606 | else | |
607 | host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; | |
608 | ||
609 | if (host->power_mode != ios->power_mode) { | |
610 | if (host->pdata && host->pdata->setpower) | |
611 | host->pdata->setpower(mmc_dev(mmc), ios->vdd); | |
612 | host->power_mode = ios->power_mode; | |
613 | if (ios->power_mode == MMC_POWER_ON) | |
614 | host->cmdat |= CMD_DAT_CONT_INIT; | |
615 | } | |
616 | ||
617 | if (ios->clock) { | |
618 | mxcmci_set_clk_rate(host, ios->clock); | |
619 | writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); | |
620 | } else { | |
621 | writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK); | |
622 | } | |
623 | ||
624 | host->clock = ios->clock; | |
625 | } | |
626 | ||
627 | static irqreturn_t mxcmci_detect_irq(int irq, void *data) | |
628 | { | |
629 | struct mmc_host *mmc = data; | |
630 | ||
631 | dev_dbg(mmc_dev(mmc), "%s\n", __func__); | |
632 | ||
633 | mmc_detect_change(mmc, msecs_to_jiffies(250)); | |
634 | return IRQ_HANDLED; | |
635 | } | |
636 | ||
637 | static int mxcmci_get_ro(struct mmc_host *mmc) | |
638 | { | |
639 | struct mxcmci_host *host = mmc_priv(mmc); | |
640 | ||
641 | if (host->pdata && host->pdata->get_ro) | |
642 | return !!host->pdata->get_ro(mmc_dev(mmc)); | |
643 | /* | |
644 | * Board doesn't support read only detection; let the mmc core | |
645 | * decide what to do. | |
646 | */ | |
647 | return -ENOSYS; | |
648 | } | |
649 | ||
650 | ||
651 | static const struct mmc_host_ops mxcmci_ops = { | |
652 | .request = mxcmci_request, | |
653 | .set_ios = mxcmci_set_ios, | |
654 | .get_ro = mxcmci_get_ro, | |
655 | }; | |
656 | ||
657 | static int mxcmci_probe(struct platform_device *pdev) | |
658 | { | |
659 | struct mmc_host *mmc; | |
660 | struct mxcmci_host *host = NULL; | |
661 | struct resource *r; | |
662 | int ret = 0, irq; | |
663 | ||
664 | printk(KERN_INFO "i.MX SDHC driver\n"); | |
665 | ||
666 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
667 | irq = platform_get_irq(pdev, 0); | |
668 | if (!r || irq < 0) | |
669 | return -EINVAL; | |
670 | ||
671 | r = request_mem_region(r->start, resource_size(r), pdev->name); | |
672 | if (!r) | |
673 | return -EBUSY; | |
674 | ||
675 | mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev); | |
676 | if (!mmc) { | |
677 | ret = -ENOMEM; | |
678 | goto out_release_mem; | |
679 | } | |
680 | ||
681 | mmc->ops = &mxcmci_ops; | |
682 | mmc->caps = MMC_CAP_4_BIT_DATA; | |
683 | ||
684 | /* MMC core transfer sizes tunable parameters */ | |
685 | mmc->max_hw_segs = 64; | |
686 | mmc->max_phys_segs = 64; | |
687 | mmc->max_blk_size = 2048; | |
688 | mmc->max_blk_count = 65535; | |
689 | mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; | |
690 | mmc->max_seg_size = mmc->max_seg_size; | |
691 | ||
692 | host = mmc_priv(mmc); | |
693 | host->base = ioremap(r->start, resource_size(r)); | |
694 | if (!host->base) { | |
695 | ret = -ENOMEM; | |
696 | goto out_free; | |
697 | } | |
698 | ||
699 | host->mmc = mmc; | |
700 | host->pdata = pdev->dev.platform_data; | |
701 | ||
702 | if (host->pdata && host->pdata->ocr_avail) | |
703 | mmc->ocr_avail = host->pdata->ocr_avail; | |
704 | else | |
705 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; | |
706 | ||
707 | host->res = r; | |
708 | host->irq = irq; | |
709 | ||
06277b5c | 710 | host->clk = clk_get(&pdev->dev, NULL); |
d96be879 SH |
711 | if (IS_ERR(host->clk)) { |
712 | ret = PTR_ERR(host->clk); | |
713 | goto out_iounmap; | |
714 | } | |
715 | clk_enable(host->clk); | |
716 | ||
717 | mxcmci_softreset(host); | |
718 | ||
719 | host->rev_no = readw(host->base + MMC_REG_REV_NO); | |
720 | if (host->rev_no != 0x400) { | |
721 | ret = -ENODEV; | |
722 | dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", | |
723 | host->rev_no); | |
724 | goto out_clk_put; | |
725 | } | |
726 | ||
727 | mmc->f_min = clk_get_rate(host->clk) >> 7; | |
728 | mmc->f_max = clk_get_rate(host->clk) >> 1; | |
729 | ||
730 | /* recommended in data sheet */ | |
731 | writew(0x2db4, host->base + MMC_REG_READ_TO); | |
732 | ||
733 | writel(0, host->base + MMC_REG_INT_CNTR); | |
734 | ||
735 | #ifdef HAS_DMA | |
736 | host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW); | |
737 | if (host->dma < 0) { | |
738 | dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n"); | |
739 | ret = -EBUSY; | |
740 | goto out_clk_put; | |
741 | } | |
742 | ||
743 | r = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
744 | if (!r) { | |
745 | ret = -EINVAL; | |
746 | goto out_free_dma; | |
747 | } | |
748 | ||
749 | ret = imx_dma_config_channel(host->dma, | |
750 | IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO, | |
751 | IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR, | |
752 | r->start, 0); | |
753 | if (ret) { | |
754 | dev_err(mmc_dev(host->mmc), "failed to config DMA channel\n"); | |
755 | goto out_free_dma; | |
756 | } | |
757 | #endif | |
758 | INIT_WORK(&host->datawork, mxcmci_datawork); | |
759 | ||
760 | ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host); | |
761 | if (ret) | |
762 | goto out_free_dma; | |
763 | ||
764 | platform_set_drvdata(pdev, mmc); | |
765 | ||
766 | if (host->pdata && host->pdata->init) { | |
767 | ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, | |
768 | host->mmc); | |
769 | if (ret) | |
770 | goto out_free_irq; | |
771 | } | |
772 | ||
773 | mmc_add_host(mmc); | |
774 | ||
775 | return 0; | |
776 | ||
777 | out_free_irq: | |
778 | free_irq(host->irq, host); | |
779 | out_free_dma: | |
780 | #ifdef HAS_DMA | |
781 | imx_dma_free(host->dma); | |
782 | #endif | |
783 | out_clk_put: | |
784 | clk_disable(host->clk); | |
785 | clk_put(host->clk); | |
786 | out_iounmap: | |
787 | iounmap(host->base); | |
788 | out_free: | |
789 | mmc_free_host(mmc); | |
790 | out_release_mem: | |
791 | release_mem_region(host->res->start, resource_size(host->res)); | |
792 | return ret; | |
793 | } | |
794 | ||
795 | static int mxcmci_remove(struct platform_device *pdev) | |
796 | { | |
797 | struct mmc_host *mmc = platform_get_drvdata(pdev); | |
798 | struct mxcmci_host *host = mmc_priv(mmc); | |
799 | ||
800 | platform_set_drvdata(pdev, NULL); | |
801 | ||
802 | mmc_remove_host(mmc); | |
803 | ||
804 | if (host->pdata && host->pdata->exit) | |
805 | host->pdata->exit(&pdev->dev, mmc); | |
806 | ||
807 | free_irq(host->irq, host); | |
808 | iounmap(host->base); | |
809 | #ifdef HAS_DMA | |
810 | imx_dma_free(host->dma); | |
811 | #endif | |
812 | clk_disable(host->clk); | |
813 | clk_put(host->clk); | |
814 | ||
815 | release_mem_region(host->res->start, resource_size(host->res)); | |
816 | release_resource(host->res); | |
817 | ||
818 | mmc_free_host(mmc); | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
823 | #ifdef CONFIG_PM | |
824 | static int mxcmci_suspend(struct platform_device *dev, pm_message_t state) | |
825 | { | |
826 | struct mmc_host *mmc = platform_get_drvdata(dev); | |
827 | int ret = 0; | |
828 | ||
829 | if (mmc) | |
830 | ret = mmc_suspend_host(mmc, state); | |
831 | ||
832 | return ret; | |
833 | } | |
834 | ||
835 | static int mxcmci_resume(struct platform_device *dev) | |
836 | { | |
837 | struct mmc_host *mmc = platform_get_drvdata(dev); | |
838 | struct mxcmci_host *host; | |
839 | int ret = 0; | |
840 | ||
841 | if (mmc) { | |
842 | host = mmc_priv(mmc); | |
843 | ret = mmc_resume_host(mmc); | |
844 | } | |
845 | ||
846 | return ret; | |
847 | } | |
848 | #else | |
849 | #define mxcmci_suspend NULL | |
850 | #define mxcmci_resume NULL | |
851 | #endif /* CONFIG_PM */ | |
852 | ||
853 | static struct platform_driver mxcmci_driver = { | |
854 | .probe = mxcmci_probe, | |
855 | .remove = mxcmci_remove, | |
856 | .suspend = mxcmci_suspend, | |
857 | .resume = mxcmci_resume, | |
858 | .driver = { | |
859 | .name = DRIVER_NAME, | |
860 | .owner = THIS_MODULE, | |
861 | } | |
862 | }; | |
863 | ||
864 | static int __init mxcmci_init(void) | |
865 | { | |
866 | return platform_driver_register(&mxcmci_driver); | |
867 | } | |
868 | ||
869 | static void __exit mxcmci_exit(void) | |
870 | { | |
871 | platform_driver_unregister(&mxcmci_driver); | |
872 | } | |
873 | ||
874 | module_init(mxcmci_init); | |
875 | module_exit(mxcmci_exit); | |
876 | ||
877 | MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); | |
878 | MODULE_AUTHOR("Sascha Hauer, Pengutronix"); | |
879 | MODULE_LICENSE("GPL"); | |
880 | MODULE_ALIAS("platform:imx-mmc"); |