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e4243f13 SG |
1 | /* |
2 | * Portions copyright (C) 2003 Russell King, PXA MMCI Driver | |
3 | * Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC driver | |
4 | * | |
5 | * Copyright 2008 Embedded Alley Solutions, Inc. | |
6 | * Copyright 2009-2011 Freescale Semiconductor, Inc. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/ioport.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/dma-mapping.h> | |
30 | #include <linux/dmaengine.h> | |
31 | #include <linux/highmem.h> | |
32 | #include <linux/clk.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/completion.h> | |
35 | #include <linux/mmc/host.h> | |
36 | #include <linux/mmc/mmc.h> | |
37 | #include <linux/mmc/sdio.h> | |
38 | #include <linux/gpio.h> | |
39 | #include <linux/regulator/consumer.h> | |
88b47679 | 40 | #include <linux/module.h> |
39468604 | 41 | #include <linux/fsl/mxs-dma.h> |
e4243f13 SG |
42 | |
43 | #include <mach/mxs.h> | |
44 | #include <mach/common.h> | |
e4243f13 SG |
45 | #include <mach/mmc.h> |
46 | ||
47 | #define DRIVER_NAME "mxs-mmc" | |
48 | ||
49 | /* card detect polling timeout */ | |
50 | #define MXS_MMC_DETECT_TIMEOUT (HZ/2) | |
51 | ||
52 | #define SSP_VERSION_LATEST 4 | |
53 | #define ssp_is_old() (host->version < SSP_VERSION_LATEST) | |
54 | ||
55 | /* SSP registers */ | |
56 | #define HW_SSP_CTRL0 0x000 | |
57 | #define BM_SSP_CTRL0_RUN (1 << 29) | |
58 | #define BM_SSP_CTRL0_SDIO_IRQ_CHECK (1 << 28) | |
59 | #define BM_SSP_CTRL0_IGNORE_CRC (1 << 26) | |
60 | #define BM_SSP_CTRL0_READ (1 << 25) | |
61 | #define BM_SSP_CTRL0_DATA_XFER (1 << 24) | |
62 | #define BP_SSP_CTRL0_BUS_WIDTH (22) | |
63 | #define BM_SSP_CTRL0_BUS_WIDTH (0x3 << 22) | |
64 | #define BM_SSP_CTRL0_WAIT_FOR_IRQ (1 << 21) | |
65 | #define BM_SSP_CTRL0_LONG_RESP (1 << 19) | |
66 | #define BM_SSP_CTRL0_GET_RESP (1 << 17) | |
67 | #define BM_SSP_CTRL0_ENABLE (1 << 16) | |
68 | #define BP_SSP_CTRL0_XFER_COUNT (0) | |
69 | #define BM_SSP_CTRL0_XFER_COUNT (0xffff) | |
70 | #define HW_SSP_CMD0 0x010 | |
71 | #define BM_SSP_CMD0_DBL_DATA_RATE_EN (1 << 25) | |
72 | #define BM_SSP_CMD0_SLOW_CLKING_EN (1 << 22) | |
73 | #define BM_SSP_CMD0_CONT_CLKING_EN (1 << 21) | |
74 | #define BM_SSP_CMD0_APPEND_8CYC (1 << 20) | |
75 | #define BP_SSP_CMD0_BLOCK_SIZE (16) | |
76 | #define BM_SSP_CMD0_BLOCK_SIZE (0xf << 16) | |
77 | #define BP_SSP_CMD0_BLOCK_COUNT (8) | |
78 | #define BM_SSP_CMD0_BLOCK_COUNT (0xff << 8) | |
79 | #define BP_SSP_CMD0_CMD (0) | |
80 | #define BM_SSP_CMD0_CMD (0xff) | |
81 | #define HW_SSP_CMD1 0x020 | |
82 | #define HW_SSP_XFER_SIZE 0x030 | |
83 | #define HW_SSP_BLOCK_SIZE 0x040 | |
84 | #define BP_SSP_BLOCK_SIZE_BLOCK_COUNT (4) | |
85 | #define BM_SSP_BLOCK_SIZE_BLOCK_COUNT (0xffffff << 4) | |
86 | #define BP_SSP_BLOCK_SIZE_BLOCK_SIZE (0) | |
87 | #define BM_SSP_BLOCK_SIZE_BLOCK_SIZE (0xf) | |
88 | #define HW_SSP_TIMING (ssp_is_old() ? 0x050 : 0x070) | |
89 | #define BP_SSP_TIMING_TIMEOUT (16) | |
90 | #define BM_SSP_TIMING_TIMEOUT (0xffff << 16) | |
91 | #define BP_SSP_TIMING_CLOCK_DIVIDE (8) | |
92 | #define BM_SSP_TIMING_CLOCK_DIVIDE (0xff << 8) | |
93 | #define BP_SSP_TIMING_CLOCK_RATE (0) | |
94 | #define BM_SSP_TIMING_CLOCK_RATE (0xff) | |
95 | #define HW_SSP_CTRL1 (ssp_is_old() ? 0x060 : 0x080) | |
96 | #define BM_SSP_CTRL1_SDIO_IRQ (1 << 31) | |
97 | #define BM_SSP_CTRL1_SDIO_IRQ_EN (1 << 30) | |
98 | #define BM_SSP_CTRL1_RESP_ERR_IRQ (1 << 29) | |
99 | #define BM_SSP_CTRL1_RESP_ERR_IRQ_EN (1 << 28) | |
100 | #define BM_SSP_CTRL1_RESP_TIMEOUT_IRQ (1 << 27) | |
101 | #define BM_SSP_CTRL1_RESP_TIMEOUT_IRQ_EN (1 << 26) | |
102 | #define BM_SSP_CTRL1_DATA_TIMEOUT_IRQ (1 << 25) | |
103 | #define BM_SSP_CTRL1_DATA_TIMEOUT_IRQ_EN (1 << 24) | |
104 | #define BM_SSP_CTRL1_DATA_CRC_IRQ (1 << 23) | |
105 | #define BM_SSP_CTRL1_DATA_CRC_IRQ_EN (1 << 22) | |
106 | #define BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ (1 << 21) | |
107 | #define BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ_EN (1 << 20) | |
108 | #define BM_SSP_CTRL1_RECV_TIMEOUT_IRQ (1 << 17) | |
109 | #define BM_SSP_CTRL1_RECV_TIMEOUT_IRQ_EN (1 << 16) | |
110 | #define BM_SSP_CTRL1_FIFO_OVERRUN_IRQ (1 << 15) | |
111 | #define BM_SSP_CTRL1_FIFO_OVERRUN_IRQ_EN (1 << 14) | |
112 | #define BM_SSP_CTRL1_DMA_ENABLE (1 << 13) | |
113 | #define BM_SSP_CTRL1_POLARITY (1 << 9) | |
114 | #define BP_SSP_CTRL1_WORD_LENGTH (4) | |
115 | #define BM_SSP_CTRL1_WORD_LENGTH (0xf << 4) | |
116 | #define BP_SSP_CTRL1_SSP_MODE (0) | |
117 | #define BM_SSP_CTRL1_SSP_MODE (0xf) | |
118 | #define HW_SSP_SDRESP0 (ssp_is_old() ? 0x080 : 0x0a0) | |
119 | #define HW_SSP_SDRESP1 (ssp_is_old() ? 0x090 : 0x0b0) | |
120 | #define HW_SSP_SDRESP2 (ssp_is_old() ? 0x0a0 : 0x0c0) | |
121 | #define HW_SSP_SDRESP3 (ssp_is_old() ? 0x0b0 : 0x0d0) | |
122 | #define HW_SSP_STATUS (ssp_is_old() ? 0x0c0 : 0x100) | |
123 | #define BM_SSP_STATUS_CARD_DETECT (1 << 28) | |
124 | #define BM_SSP_STATUS_SDIO_IRQ (1 << 17) | |
125 | #define HW_SSP_VERSION (cpu_is_mx23() ? 0x110 : 0x130) | |
126 | #define BP_SSP_VERSION_MAJOR (24) | |
127 | ||
128 | #define BF_SSP(value, field) (((value) << BP_SSP_##field) & BM_SSP_##field) | |
129 | ||
130 | #define MXS_MMC_IRQ_BITS (BM_SSP_CTRL1_SDIO_IRQ | \ | |
131 | BM_SSP_CTRL1_RESP_ERR_IRQ | \ | |
132 | BM_SSP_CTRL1_RESP_TIMEOUT_IRQ | \ | |
133 | BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | \ | |
134 | BM_SSP_CTRL1_DATA_CRC_IRQ | \ | |
135 | BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | \ | |
136 | BM_SSP_CTRL1_RECV_TIMEOUT_IRQ | \ | |
137 | BM_SSP_CTRL1_FIFO_OVERRUN_IRQ) | |
138 | ||
139 | #define SSP_PIO_NUM 3 | |
140 | ||
141 | struct mxs_mmc_host { | |
142 | struct mmc_host *mmc; | |
143 | struct mmc_request *mrq; | |
144 | struct mmc_command *cmd; | |
145 | struct mmc_data *data; | |
146 | ||
147 | void __iomem *base; | |
148 | int irq; | |
149 | struct resource *res; | |
150 | struct resource *dma_res; | |
151 | struct clk *clk; | |
152 | unsigned int clk_rate; | |
153 | ||
154 | struct dma_chan *dmach; | |
155 | struct mxs_dma_data dma_data; | |
156 | unsigned int dma_dir; | |
05f5799c | 157 | enum dma_transfer_direction slave_dirn; |
e4243f13 SG |
158 | u32 ssp_pio_words[SSP_PIO_NUM]; |
159 | ||
160 | unsigned int version; | |
161 | unsigned char bus_width; | |
162 | spinlock_t lock; | |
163 | int sdio_irq_en; | |
164 | }; | |
165 | ||
166 | static int mxs_mmc_get_ro(struct mmc_host *mmc) | |
167 | { | |
168 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
169 | struct mxs_mmc_platform_data *pdata = | |
170 | mmc_dev(host->mmc)->platform_data; | |
171 | ||
172 | if (!pdata) | |
173 | return -EFAULT; | |
174 | ||
175 | if (!gpio_is_valid(pdata->wp_gpio)) | |
176 | return -EINVAL; | |
177 | ||
178 | return gpio_get_value(pdata->wp_gpio); | |
179 | } | |
180 | ||
181 | static int mxs_mmc_get_cd(struct mmc_host *mmc) | |
182 | { | |
183 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
184 | ||
185 | return !(readl(host->base + HW_SSP_STATUS) & | |
186 | BM_SSP_STATUS_CARD_DETECT); | |
187 | } | |
188 | ||
189 | static void mxs_mmc_reset(struct mxs_mmc_host *host) | |
190 | { | |
191 | u32 ctrl0, ctrl1; | |
192 | ||
193 | mxs_reset_block(host->base); | |
194 | ||
195 | ctrl0 = BM_SSP_CTRL0_IGNORE_CRC; | |
196 | ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) | | |
197 | BF_SSP(0x7, CTRL1_WORD_LENGTH) | | |
198 | BM_SSP_CTRL1_DMA_ENABLE | | |
199 | BM_SSP_CTRL1_POLARITY | | |
200 | BM_SSP_CTRL1_RECV_TIMEOUT_IRQ_EN | | |
201 | BM_SSP_CTRL1_DATA_CRC_IRQ_EN | | |
202 | BM_SSP_CTRL1_DATA_TIMEOUT_IRQ_EN | | |
203 | BM_SSP_CTRL1_RESP_TIMEOUT_IRQ_EN | | |
204 | BM_SSP_CTRL1_RESP_ERR_IRQ_EN; | |
205 | ||
206 | writel(BF_SSP(0xffff, TIMING_TIMEOUT) | | |
207 | BF_SSP(2, TIMING_CLOCK_DIVIDE) | | |
208 | BF_SSP(0, TIMING_CLOCK_RATE), | |
209 | host->base + HW_SSP_TIMING); | |
210 | ||
211 | if (host->sdio_irq_en) { | |
212 | ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; | |
213 | ctrl1 |= BM_SSP_CTRL1_SDIO_IRQ_EN; | |
214 | } | |
215 | ||
216 | writel(ctrl0, host->base + HW_SSP_CTRL0); | |
217 | writel(ctrl1, host->base + HW_SSP_CTRL1); | |
218 | } | |
219 | ||
220 | static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, | |
221 | struct mmc_command *cmd); | |
222 | ||
223 | static void mxs_mmc_request_done(struct mxs_mmc_host *host) | |
224 | { | |
225 | struct mmc_command *cmd = host->cmd; | |
226 | struct mmc_data *data = host->data; | |
227 | struct mmc_request *mrq = host->mrq; | |
228 | ||
229 | if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) { | |
230 | if (mmc_resp_type(cmd) & MMC_RSP_136) { | |
231 | cmd->resp[3] = readl(host->base + HW_SSP_SDRESP0); | |
232 | cmd->resp[2] = readl(host->base + HW_SSP_SDRESP1); | |
233 | cmd->resp[1] = readl(host->base + HW_SSP_SDRESP2); | |
234 | cmd->resp[0] = readl(host->base + HW_SSP_SDRESP3); | |
235 | } else { | |
236 | cmd->resp[0] = readl(host->base + HW_SSP_SDRESP0); | |
237 | } | |
238 | } | |
239 | ||
240 | if (data) { | |
241 | dma_unmap_sg(mmc_dev(host->mmc), data->sg, | |
242 | data->sg_len, host->dma_dir); | |
243 | /* | |
244 | * If there was an error on any block, we mark all | |
245 | * data blocks as being in error. | |
246 | */ | |
247 | if (!data->error) | |
248 | data->bytes_xfered = data->blocks * data->blksz; | |
249 | else | |
250 | data->bytes_xfered = 0; | |
251 | ||
252 | host->data = NULL; | |
253 | if (mrq->stop) { | |
254 | mxs_mmc_start_cmd(host, mrq->stop); | |
255 | return; | |
256 | } | |
257 | } | |
258 | ||
259 | host->mrq = NULL; | |
260 | mmc_request_done(host->mmc, mrq); | |
261 | } | |
262 | ||
263 | static void mxs_mmc_dma_irq_callback(void *param) | |
264 | { | |
265 | struct mxs_mmc_host *host = param; | |
266 | ||
267 | mxs_mmc_request_done(host); | |
268 | } | |
269 | ||
270 | static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id) | |
271 | { | |
272 | struct mxs_mmc_host *host = dev_id; | |
273 | struct mmc_command *cmd = host->cmd; | |
274 | struct mmc_data *data = host->data; | |
275 | u32 stat; | |
276 | ||
277 | spin_lock(&host->lock); | |
278 | ||
279 | stat = readl(host->base + HW_SSP_CTRL1); | |
280 | writel(stat & MXS_MMC_IRQ_BITS, | |
281 | host->base + HW_SSP_CTRL1 + MXS_CLR_ADDR); | |
282 | ||
283 | if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN)) | |
284 | mmc_signal_sdio_irq(host->mmc); | |
285 | ||
286 | spin_unlock(&host->lock); | |
287 | ||
288 | if (stat & BM_SSP_CTRL1_RESP_TIMEOUT_IRQ) | |
289 | cmd->error = -ETIMEDOUT; | |
290 | else if (stat & BM_SSP_CTRL1_RESP_ERR_IRQ) | |
291 | cmd->error = -EIO; | |
292 | ||
293 | if (data) { | |
294 | if (stat & (BM_SSP_CTRL1_DATA_TIMEOUT_IRQ | | |
295 | BM_SSP_CTRL1_RECV_TIMEOUT_IRQ)) | |
296 | data->error = -ETIMEDOUT; | |
297 | else if (stat & BM_SSP_CTRL1_DATA_CRC_IRQ) | |
298 | data->error = -EILSEQ; | |
299 | else if (stat & (BM_SSP_CTRL1_FIFO_UNDERRUN_IRQ | | |
300 | BM_SSP_CTRL1_FIFO_OVERRUN_IRQ)) | |
301 | data->error = -EIO; | |
302 | } | |
303 | ||
304 | return IRQ_HANDLED; | |
305 | } | |
306 | ||
307 | static struct dma_async_tx_descriptor *mxs_mmc_prep_dma( | |
921de864 | 308 | struct mxs_mmc_host *host, unsigned long flags) |
e4243f13 SG |
309 | { |
310 | struct dma_async_tx_descriptor *desc; | |
311 | struct mmc_data *data = host->data; | |
312 | struct scatterlist * sgl; | |
313 | unsigned int sg_len; | |
314 | ||
315 | if (data) { | |
316 | /* data */ | |
317 | dma_map_sg(mmc_dev(host->mmc), data->sg, | |
318 | data->sg_len, host->dma_dir); | |
319 | sgl = data->sg; | |
320 | sg_len = data->sg_len; | |
321 | } else { | |
322 | /* pio */ | |
323 | sgl = (struct scatterlist *) host->ssp_pio_words; | |
324 | sg_len = SSP_PIO_NUM; | |
325 | } | |
326 | ||
16052827 | 327 | desc = dmaengine_prep_slave_sg(host->dmach, |
921de864 | 328 | sgl, sg_len, host->slave_dirn, flags); |
e4243f13 SG |
329 | if (desc) { |
330 | desc->callback = mxs_mmc_dma_irq_callback; | |
331 | desc->callback_param = host; | |
332 | } else { | |
333 | if (data) | |
334 | dma_unmap_sg(mmc_dev(host->mmc), data->sg, | |
335 | data->sg_len, host->dma_dir); | |
336 | } | |
337 | ||
338 | return desc; | |
339 | } | |
340 | ||
341 | static void mxs_mmc_bc(struct mxs_mmc_host *host) | |
342 | { | |
343 | struct mmc_command *cmd = host->cmd; | |
344 | struct dma_async_tx_descriptor *desc; | |
345 | u32 ctrl0, cmd0, cmd1; | |
346 | ||
347 | ctrl0 = BM_SSP_CTRL0_ENABLE | BM_SSP_CTRL0_IGNORE_CRC; | |
348 | cmd0 = BF_SSP(cmd->opcode, CMD0_CMD) | BM_SSP_CMD0_APPEND_8CYC; | |
349 | cmd1 = cmd->arg; | |
350 | ||
351 | if (host->sdio_irq_en) { | |
352 | ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; | |
353 | cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; | |
354 | } | |
355 | ||
356 | host->ssp_pio_words[0] = ctrl0; | |
357 | host->ssp_pio_words[1] = cmd0; | |
358 | host->ssp_pio_words[2] = cmd1; | |
359 | host->dma_dir = DMA_NONE; | |
a4e3e86d | 360 | host->slave_dirn = DMA_TRANS_NONE; |
921de864 | 361 | desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK); |
e4243f13 SG |
362 | if (!desc) |
363 | goto out; | |
364 | ||
365 | dmaengine_submit(desc); | |
d04525ed | 366 | dma_async_issue_pending(host->dmach); |
e4243f13 SG |
367 | return; |
368 | ||
369 | out: | |
370 | dev_warn(mmc_dev(host->mmc), | |
371 | "%s: failed to prep dma\n", __func__); | |
372 | } | |
373 | ||
374 | static void mxs_mmc_ac(struct mxs_mmc_host *host) | |
375 | { | |
376 | struct mmc_command *cmd = host->cmd; | |
377 | struct dma_async_tx_descriptor *desc; | |
378 | u32 ignore_crc, get_resp, long_resp; | |
379 | u32 ctrl0, cmd0, cmd1; | |
380 | ||
381 | ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? | |
382 | 0 : BM_SSP_CTRL0_IGNORE_CRC; | |
383 | get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? | |
384 | BM_SSP_CTRL0_GET_RESP : 0; | |
385 | long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? | |
386 | BM_SSP_CTRL0_LONG_RESP : 0; | |
387 | ||
388 | ctrl0 = BM_SSP_CTRL0_ENABLE | ignore_crc | get_resp | long_resp; | |
389 | cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); | |
390 | cmd1 = cmd->arg; | |
391 | ||
392 | if (host->sdio_irq_en) { | |
393 | ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; | |
394 | cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; | |
395 | } | |
396 | ||
397 | host->ssp_pio_words[0] = ctrl0; | |
398 | host->ssp_pio_words[1] = cmd0; | |
399 | host->ssp_pio_words[2] = cmd1; | |
400 | host->dma_dir = DMA_NONE; | |
a4e3e86d | 401 | host->slave_dirn = DMA_TRANS_NONE; |
921de864 | 402 | desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK); |
e4243f13 SG |
403 | if (!desc) |
404 | goto out; | |
405 | ||
406 | dmaengine_submit(desc); | |
d04525ed | 407 | dma_async_issue_pending(host->dmach); |
e4243f13 SG |
408 | return; |
409 | ||
410 | out: | |
411 | dev_warn(mmc_dev(host->mmc), | |
412 | "%s: failed to prep dma\n", __func__); | |
413 | } | |
414 | ||
415 | static unsigned short mxs_ns_to_ssp_ticks(unsigned clock_rate, unsigned ns) | |
416 | { | |
417 | const unsigned int ssp_timeout_mul = 4096; | |
418 | /* | |
419 | * Calculate ticks in ms since ns are large numbers | |
420 | * and might overflow | |
421 | */ | |
422 | const unsigned int clock_per_ms = clock_rate / 1000; | |
423 | const unsigned int ms = ns / 1000; | |
424 | const unsigned int ticks = ms * clock_per_ms; | |
425 | const unsigned int ssp_ticks = ticks / ssp_timeout_mul; | |
426 | ||
427 | WARN_ON(ssp_ticks == 0); | |
428 | return ssp_ticks; | |
429 | } | |
430 | ||
431 | static void mxs_mmc_adtc(struct mxs_mmc_host *host) | |
432 | { | |
433 | struct mmc_command *cmd = host->cmd; | |
434 | struct mmc_data *data = cmd->data; | |
435 | struct dma_async_tx_descriptor *desc; | |
436 | struct scatterlist *sgl = data->sg, *sg; | |
437 | unsigned int sg_len = data->sg_len; | |
438 | int i; | |
439 | ||
440 | unsigned short dma_data_dir, timeout; | |
05f5799c | 441 | enum dma_transfer_direction slave_dirn; |
e4243f13 SG |
442 | unsigned int data_size = 0, log2_blksz; |
443 | unsigned int blocks = data->blocks; | |
444 | ||
445 | u32 ignore_crc, get_resp, long_resp, read; | |
446 | u32 ctrl0, cmd0, cmd1, val; | |
447 | ||
448 | ignore_crc = (mmc_resp_type(cmd) & MMC_RSP_CRC) ? | |
449 | 0 : BM_SSP_CTRL0_IGNORE_CRC; | |
450 | get_resp = (mmc_resp_type(cmd) & MMC_RSP_PRESENT) ? | |
451 | BM_SSP_CTRL0_GET_RESP : 0; | |
452 | long_resp = (mmc_resp_type(cmd) & MMC_RSP_136) ? | |
453 | BM_SSP_CTRL0_LONG_RESP : 0; | |
454 | ||
455 | if (data->flags & MMC_DATA_WRITE) { | |
456 | dma_data_dir = DMA_TO_DEVICE; | |
05f5799c | 457 | slave_dirn = DMA_MEM_TO_DEV; |
e4243f13 SG |
458 | read = 0; |
459 | } else { | |
460 | dma_data_dir = DMA_FROM_DEVICE; | |
05f5799c | 461 | slave_dirn = DMA_DEV_TO_MEM; |
e4243f13 SG |
462 | read = BM_SSP_CTRL0_READ; |
463 | } | |
464 | ||
465 | ctrl0 = BF_SSP(host->bus_width, CTRL0_BUS_WIDTH) | | |
466 | ignore_crc | get_resp | long_resp | | |
467 | BM_SSP_CTRL0_DATA_XFER | read | | |
468 | BM_SSP_CTRL0_WAIT_FOR_IRQ | | |
469 | BM_SSP_CTRL0_ENABLE; | |
470 | ||
471 | cmd0 = BF_SSP(cmd->opcode, CMD0_CMD); | |
472 | ||
473 | /* get logarithm to base 2 of block size for setting register */ | |
474 | log2_blksz = ilog2(data->blksz); | |
475 | ||
476 | /* | |
477 | * take special care of the case that data size from data->sg | |
478 | * is not equal to blocks x blksz | |
479 | */ | |
480 | for_each_sg(sgl, sg, sg_len, i) | |
481 | data_size += sg->length; | |
482 | ||
483 | if (data_size != data->blocks * data->blksz) | |
484 | blocks = 1; | |
485 | ||
486 | /* xfer count, block size and count need to be set differently */ | |
487 | if (ssp_is_old()) { | |
488 | ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT); | |
489 | cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) | | |
490 | BF_SSP(blocks - 1, CMD0_BLOCK_COUNT); | |
491 | } else { | |
492 | writel(data_size, host->base + HW_SSP_XFER_SIZE); | |
493 | writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) | | |
494 | BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT), | |
495 | host->base + HW_SSP_BLOCK_SIZE); | |
496 | } | |
497 | ||
498 | if ((cmd->opcode == MMC_STOP_TRANSMISSION) || | |
499 | (cmd->opcode == SD_IO_RW_EXTENDED)) | |
500 | cmd0 |= BM_SSP_CMD0_APPEND_8CYC; | |
501 | ||
502 | cmd1 = cmd->arg; | |
503 | ||
504 | if (host->sdio_irq_en) { | |
505 | ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK; | |
506 | cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN; | |
507 | } | |
508 | ||
509 | /* set the timeout count */ | |
510 | timeout = mxs_ns_to_ssp_ticks(host->clk_rate, data->timeout_ns); | |
511 | val = readl(host->base + HW_SSP_TIMING); | |
512 | val &= ~(BM_SSP_TIMING_TIMEOUT); | |
513 | val |= BF_SSP(timeout, TIMING_TIMEOUT); | |
514 | writel(val, host->base + HW_SSP_TIMING); | |
515 | ||
516 | /* pio */ | |
517 | host->ssp_pio_words[0] = ctrl0; | |
518 | host->ssp_pio_words[1] = cmd0; | |
519 | host->ssp_pio_words[2] = cmd1; | |
520 | host->dma_dir = DMA_NONE; | |
a4e3e86d | 521 | host->slave_dirn = DMA_TRANS_NONE; |
e4243f13 SG |
522 | desc = mxs_mmc_prep_dma(host, 0); |
523 | if (!desc) | |
524 | goto out; | |
525 | ||
526 | /* append data sg */ | |
527 | WARN_ON(host->data != NULL); | |
528 | host->data = data; | |
529 | host->dma_dir = dma_data_dir; | |
05f5799c | 530 | host->slave_dirn = slave_dirn; |
921de864 | 531 | desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
e4243f13 SG |
532 | if (!desc) |
533 | goto out; | |
534 | ||
535 | dmaengine_submit(desc); | |
d04525ed | 536 | dma_async_issue_pending(host->dmach); |
e4243f13 SG |
537 | return; |
538 | out: | |
539 | dev_warn(mmc_dev(host->mmc), | |
540 | "%s: failed to prep dma\n", __func__); | |
541 | } | |
542 | ||
543 | static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, | |
544 | struct mmc_command *cmd) | |
545 | { | |
546 | host->cmd = cmd; | |
547 | ||
548 | switch (mmc_cmd_type(cmd)) { | |
549 | case MMC_CMD_BC: | |
550 | mxs_mmc_bc(host); | |
551 | break; | |
552 | case MMC_CMD_BCR: | |
553 | mxs_mmc_ac(host); | |
554 | break; | |
555 | case MMC_CMD_AC: | |
556 | mxs_mmc_ac(host); | |
557 | break; | |
558 | case MMC_CMD_ADTC: | |
559 | mxs_mmc_adtc(host); | |
560 | break; | |
561 | default: | |
562 | dev_warn(mmc_dev(host->mmc), | |
563 | "%s: unknown MMC command\n", __func__); | |
564 | break; | |
565 | } | |
566 | } | |
567 | ||
568 | static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) | |
569 | { | |
570 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
571 | ||
572 | WARN_ON(host->mrq != NULL); | |
573 | host->mrq = mrq; | |
574 | mxs_mmc_start_cmd(host, mrq->cmd); | |
575 | } | |
576 | ||
577 | static void mxs_mmc_set_clk_rate(struct mxs_mmc_host *host, unsigned int rate) | |
578 | { | |
d982dcdc KB |
579 | unsigned int ssp_clk, ssp_sck; |
580 | u32 clock_divide, clock_rate; | |
e4243f13 SG |
581 | u32 val; |
582 | ||
d982dcdc | 583 | ssp_clk = clk_get_rate(host->clk); |
e4243f13 | 584 | |
d982dcdc KB |
585 | for (clock_divide = 2; clock_divide <= 254; clock_divide += 2) { |
586 | clock_rate = DIV_ROUND_UP(ssp_clk, rate * clock_divide); | |
587 | clock_rate = (clock_rate > 0) ? clock_rate - 1 : 0; | |
588 | if (clock_rate <= 255) | |
e4243f13 SG |
589 | break; |
590 | } | |
591 | ||
d982dcdc | 592 | if (clock_divide > 254) { |
e4243f13 SG |
593 | dev_err(mmc_dev(host->mmc), |
594 | "%s: cannot set clock to %d\n", __func__, rate); | |
595 | return; | |
596 | } | |
597 | ||
d982dcdc | 598 | ssp_sck = ssp_clk / clock_divide / (1 + clock_rate); |
e4243f13 SG |
599 | |
600 | val = readl(host->base + HW_SSP_TIMING); | |
601 | val &= ~(BM_SSP_TIMING_CLOCK_DIVIDE | BM_SSP_TIMING_CLOCK_RATE); | |
d982dcdc KB |
602 | val |= BF_SSP(clock_divide, TIMING_CLOCK_DIVIDE); |
603 | val |= BF_SSP(clock_rate, TIMING_CLOCK_RATE); | |
e4243f13 SG |
604 | writel(val, host->base + HW_SSP_TIMING); |
605 | ||
d982dcdc | 606 | host->clk_rate = ssp_sck; |
e4243f13 SG |
607 | |
608 | dev_dbg(mmc_dev(host->mmc), | |
d982dcdc KB |
609 | "%s: clock_divide %d, clock_rate %d, ssp_clk %d, rate_actual %d, rate_requested %d\n", |
610 | __func__, clock_divide, clock_rate, ssp_clk, ssp_sck, rate); | |
e4243f13 SG |
611 | } |
612 | ||
613 | static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
614 | { | |
615 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
616 | ||
617 | if (ios->bus_width == MMC_BUS_WIDTH_8) | |
618 | host->bus_width = 2; | |
619 | else if (ios->bus_width == MMC_BUS_WIDTH_4) | |
620 | host->bus_width = 1; | |
621 | else | |
622 | host->bus_width = 0; | |
623 | ||
624 | if (ios->clock) | |
625 | mxs_mmc_set_clk_rate(host, ios->clock); | |
626 | } | |
627 | ||
628 | static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) | |
629 | { | |
630 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
631 | unsigned long flags; | |
632 | ||
633 | spin_lock_irqsave(&host->lock, flags); | |
634 | ||
635 | host->sdio_irq_en = enable; | |
636 | ||
637 | if (enable) { | |
638 | writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, | |
639 | host->base + HW_SSP_CTRL0 + MXS_SET_ADDR); | |
640 | writel(BM_SSP_CTRL1_SDIO_IRQ_EN, | |
641 | host->base + HW_SSP_CTRL1 + MXS_SET_ADDR); | |
642 | ||
643 | if (readl(host->base + HW_SSP_STATUS) & BM_SSP_STATUS_SDIO_IRQ) | |
644 | mmc_signal_sdio_irq(host->mmc); | |
645 | ||
646 | } else { | |
647 | writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK, | |
648 | host->base + HW_SSP_CTRL0 + MXS_CLR_ADDR); | |
649 | writel(BM_SSP_CTRL1_SDIO_IRQ_EN, | |
650 | host->base + HW_SSP_CTRL1 + MXS_CLR_ADDR); | |
651 | } | |
652 | ||
653 | spin_unlock_irqrestore(&host->lock, flags); | |
654 | } | |
655 | ||
656 | static const struct mmc_host_ops mxs_mmc_ops = { | |
657 | .request = mxs_mmc_request, | |
658 | .get_ro = mxs_mmc_get_ro, | |
659 | .get_cd = mxs_mmc_get_cd, | |
660 | .set_ios = mxs_mmc_set_ios, | |
661 | .enable_sdio_irq = mxs_mmc_enable_sdio_irq, | |
662 | }; | |
663 | ||
664 | static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param) | |
665 | { | |
666 | struct mxs_mmc_host *host = param; | |
667 | ||
668 | if (!mxs_dma_is_apbh(chan)) | |
669 | return false; | |
670 | ||
671 | if (chan->chan_id != host->dma_res->start) | |
672 | return false; | |
673 | ||
674 | chan->private = &host->dma_data; | |
675 | ||
676 | return true; | |
677 | } | |
678 | ||
679 | static int mxs_mmc_probe(struct platform_device *pdev) | |
680 | { | |
681 | struct mxs_mmc_host *host; | |
682 | struct mmc_host *mmc; | |
683 | struct resource *iores, *dmares, *r; | |
684 | struct mxs_mmc_platform_data *pdata; | |
685 | int ret = 0, irq_err, irq_dma; | |
686 | dma_cap_mask_t mask; | |
687 | ||
688 | iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
689 | dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
690 | irq_err = platform_get_irq(pdev, 0); | |
691 | irq_dma = platform_get_irq(pdev, 1); | |
692 | if (!iores || !dmares || irq_err < 0 || irq_dma < 0) | |
693 | return -EINVAL; | |
694 | ||
695 | r = request_mem_region(iores->start, resource_size(iores), pdev->name); | |
696 | if (!r) | |
697 | return -EBUSY; | |
698 | ||
699 | mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev); | |
700 | if (!mmc) { | |
701 | ret = -ENOMEM; | |
702 | goto out_release_mem; | |
703 | } | |
704 | ||
705 | host = mmc_priv(mmc); | |
706 | host->base = ioremap(r->start, resource_size(r)); | |
707 | if (!host->base) { | |
708 | ret = -ENOMEM; | |
709 | goto out_mmc_free; | |
710 | } | |
711 | ||
712 | /* only major verion does matter */ | |
713 | host->version = readl(host->base + HW_SSP_VERSION) >> | |
714 | BP_SSP_VERSION_MAJOR; | |
715 | ||
716 | host->mmc = mmc; | |
717 | host->res = r; | |
718 | host->dma_res = dmares; | |
719 | host->irq = irq_err; | |
720 | host->sdio_irq_en = 0; | |
721 | ||
722 | host->clk = clk_get(&pdev->dev, NULL); | |
723 | if (IS_ERR(host->clk)) { | |
724 | ret = PTR_ERR(host->clk); | |
725 | goto out_iounmap; | |
726 | } | |
efdfc52c | 727 | clk_prepare_enable(host->clk); |
e4243f13 SG |
728 | |
729 | mxs_mmc_reset(host); | |
730 | ||
731 | dma_cap_zero(mask); | |
732 | dma_cap_set(DMA_SLAVE, mask); | |
733 | host->dma_data.chan_irq = irq_dma; | |
734 | host->dmach = dma_request_channel(mask, mxs_mmc_dma_filter, host); | |
735 | if (!host->dmach) { | |
736 | dev_err(mmc_dev(host->mmc), | |
737 | "%s: failed to request dma\n", __func__); | |
738 | goto out_clk_put; | |
739 | } | |
740 | ||
741 | /* set mmc core parameters */ | |
742 | mmc->ops = &mxs_mmc_ops; | |
743 | mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | | |
744 | MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL; | |
745 | ||
746 | pdata = mmc_dev(host->mmc)->platform_data; | |
747 | if (pdata) { | |
748 | if (pdata->flags & SLOTF_8_BIT_CAPABLE) | |
749 | mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; | |
750 | if (pdata->flags & SLOTF_4_BIT_CAPABLE) | |
751 | mmc->caps |= MMC_CAP_4_BIT_DATA; | |
752 | } | |
753 | ||
754 | mmc->f_min = 400000; | |
755 | mmc->f_max = 288000000; | |
756 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; | |
757 | ||
758 | mmc->max_segs = 52; | |
759 | mmc->max_blk_size = 1 << 0xf; | |
760 | mmc->max_blk_count = (ssp_is_old()) ? 0xff : 0xffffff; | |
761 | mmc->max_req_size = (ssp_is_old()) ? 0xffff : 0xffffffff; | |
762 | mmc->max_seg_size = dma_get_max_seg_size(host->dmach->device->dev); | |
763 | ||
764 | platform_set_drvdata(pdev, mmc); | |
765 | ||
766 | ret = request_irq(host->irq, mxs_mmc_irq_handler, 0, DRIVER_NAME, host); | |
767 | if (ret) | |
768 | goto out_free_dma; | |
769 | ||
770 | spin_lock_init(&host->lock); | |
771 | ||
772 | ret = mmc_add_host(mmc); | |
773 | if (ret) | |
774 | goto out_free_irq; | |
775 | ||
776 | dev_info(mmc_dev(host->mmc), "initialized\n"); | |
777 | ||
778 | return 0; | |
779 | ||
780 | out_free_irq: | |
781 | free_irq(host->irq, host); | |
782 | out_free_dma: | |
783 | if (host->dmach) | |
784 | dma_release_channel(host->dmach); | |
785 | out_clk_put: | |
efdfc52c | 786 | clk_disable_unprepare(host->clk); |
e4243f13 SG |
787 | clk_put(host->clk); |
788 | out_iounmap: | |
789 | iounmap(host->base); | |
790 | out_mmc_free: | |
791 | mmc_free_host(mmc); | |
792 | out_release_mem: | |
793 | release_mem_region(iores->start, resource_size(iores)); | |
794 | return ret; | |
795 | } | |
796 | ||
797 | static int mxs_mmc_remove(struct platform_device *pdev) | |
798 | { | |
799 | struct mmc_host *mmc = platform_get_drvdata(pdev); | |
800 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
801 | struct resource *res = host->res; | |
802 | ||
803 | mmc_remove_host(mmc); | |
804 | ||
805 | free_irq(host->irq, host); | |
806 | ||
807 | platform_set_drvdata(pdev, NULL); | |
808 | ||
809 | if (host->dmach) | |
810 | dma_release_channel(host->dmach); | |
811 | ||
efdfc52c | 812 | clk_disable_unprepare(host->clk); |
e4243f13 SG |
813 | clk_put(host->clk); |
814 | ||
815 | iounmap(host->base); | |
816 | ||
817 | mmc_free_host(mmc); | |
818 | ||
819 | release_mem_region(res->start, resource_size(res)); | |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
824 | #ifdef CONFIG_PM | |
825 | static int mxs_mmc_suspend(struct device *dev) | |
826 | { | |
827 | struct mmc_host *mmc = dev_get_drvdata(dev); | |
828 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
829 | int ret = 0; | |
830 | ||
831 | ret = mmc_suspend_host(mmc); | |
832 | ||
efdfc52c | 833 | clk_disable_unprepare(host->clk); |
e4243f13 SG |
834 | |
835 | return ret; | |
836 | } | |
837 | ||
838 | static int mxs_mmc_resume(struct device *dev) | |
839 | { | |
840 | struct mmc_host *mmc = dev_get_drvdata(dev); | |
841 | struct mxs_mmc_host *host = mmc_priv(mmc); | |
842 | int ret = 0; | |
843 | ||
efdfc52c | 844 | clk_prepare_enable(host->clk); |
e4243f13 SG |
845 | |
846 | ret = mmc_resume_host(mmc); | |
847 | ||
848 | return ret; | |
849 | } | |
850 | ||
851 | static const struct dev_pm_ops mxs_mmc_pm_ops = { | |
852 | .suspend = mxs_mmc_suspend, | |
853 | .resume = mxs_mmc_resume, | |
854 | }; | |
855 | #endif | |
856 | ||
857 | static struct platform_driver mxs_mmc_driver = { | |
858 | .probe = mxs_mmc_probe, | |
859 | .remove = mxs_mmc_remove, | |
860 | .driver = { | |
861 | .name = DRIVER_NAME, | |
862 | .owner = THIS_MODULE, | |
863 | #ifdef CONFIG_PM | |
864 | .pm = &mxs_mmc_pm_ops, | |
865 | #endif | |
866 | }, | |
867 | }; | |
868 | ||
d1f81a64 | 869 | module_platform_driver(mxs_mmc_driver); |
e4243f13 SG |
870 | |
871 | MODULE_DESCRIPTION("FREESCALE MXS MMC peripheral"); | |
872 | MODULE_AUTHOR("Freescale Semiconductor"); | |
873 | MODULE_LICENSE("GPL"); |