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b4cff454 VB |
1 | /* |
2 | * davinci_mmc.c - TI DaVinci MMC/SD/SDIO driver | |
3 | * | |
4 | * Copyright (C) 2006 Texas Instruments. | |
5 | * Original author: Purushotam Kumar | |
6 | * Copyright (C) 2009 David Brownell | |
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 | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/clk.h> | |
27 | #include <linux/err.h> | |
7e30b8de | 28 | #include <linux/cpufreq.h> |
b4cff454 VB |
29 | #include <linux/mmc/host.h> |
30 | #include <linux/io.h> | |
31 | #include <linux/irq.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/dma-mapping.h> | |
34 | #include <linux/mmc/mmc.h> | |
35 | ||
36 | #include <mach/mmc.h> | |
37 | #include <mach/edma.h> | |
38 | ||
39 | /* | |
40 | * Register Definitions | |
41 | */ | |
42 | #define DAVINCI_MMCCTL 0x00 /* Control Register */ | |
43 | #define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register */ | |
44 | #define DAVINCI_MMCST0 0x08 /* Status Register 0 */ | |
45 | #define DAVINCI_MMCST1 0x0C /* Status Register 1 */ | |
46 | #define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register */ | |
47 | #define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register */ | |
48 | #define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register */ | |
49 | #define DAVINCI_MMCBLEN 0x1C /* Block Length Register */ | |
50 | #define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register */ | |
51 | #define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register */ | |
52 | #define DAVINCI_MMCDRR 0x28 /* Data Receive Register */ | |
53 | #define DAVINCI_MMCDXR 0x2C /* Data Transmit Register */ | |
54 | #define DAVINCI_MMCCMD 0x30 /* Command Register */ | |
55 | #define DAVINCI_MMCARGHL 0x34 /* Argument Register */ | |
56 | #define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1 */ | |
57 | #define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1 */ | |
58 | #define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1 */ | |
59 | #define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1 */ | |
60 | #define DAVINCI_MMCDRSP 0x48 /* Data Response Register */ | |
61 | #define DAVINCI_MMCETOK 0x4C | |
62 | #define DAVINCI_MMCCIDX 0x50 /* Command Index Register */ | |
63 | #define DAVINCI_MMCCKC 0x54 | |
64 | #define DAVINCI_MMCTORC 0x58 | |
65 | #define DAVINCI_MMCTODC 0x5C | |
66 | #define DAVINCI_MMCBLNC 0x60 | |
67 | #define DAVINCI_SDIOCTL 0x64 | |
68 | #define DAVINCI_SDIOST0 0x68 | |
f9db92cb AS |
69 | #define DAVINCI_SDIOIEN 0x6C |
70 | #define DAVINCI_SDIOIST 0x70 | |
b4cff454 VB |
71 | #define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */ |
72 | ||
73 | /* DAVINCI_MMCCTL definitions */ | |
74 | #define MMCCTL_DATRST (1 << 0) | |
75 | #define MMCCTL_CMDRST (1 << 1) | |
132f1074 | 76 | #define MMCCTL_WIDTH_8_BIT (1 << 8) |
b4cff454 VB |
77 | #define MMCCTL_WIDTH_4_BIT (1 << 2) |
78 | #define MMCCTL_DATEG_DISABLED (0 << 6) | |
79 | #define MMCCTL_DATEG_RISING (1 << 6) | |
80 | #define MMCCTL_DATEG_FALLING (2 << 6) | |
81 | #define MMCCTL_DATEG_BOTH (3 << 6) | |
82 | #define MMCCTL_PERMDR_LE (0 << 9) | |
83 | #define MMCCTL_PERMDR_BE (1 << 9) | |
84 | #define MMCCTL_PERMDX_LE (0 << 10) | |
85 | #define MMCCTL_PERMDX_BE (1 << 10) | |
86 | ||
87 | /* DAVINCI_MMCCLK definitions */ | |
88 | #define MMCCLK_CLKEN (1 << 8) | |
89 | #define MMCCLK_CLKRT_MASK (0xFF << 0) | |
90 | ||
91 | /* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */ | |
92 | #define MMCST0_DATDNE BIT(0) /* data done */ | |
93 | #define MMCST0_BSYDNE BIT(1) /* busy done */ | |
94 | #define MMCST0_RSPDNE BIT(2) /* command done */ | |
95 | #define MMCST0_TOUTRD BIT(3) /* data read timeout */ | |
96 | #define MMCST0_TOUTRS BIT(4) /* command response timeout */ | |
97 | #define MMCST0_CRCWR BIT(5) /* data write CRC error */ | |
98 | #define MMCST0_CRCRD BIT(6) /* data read CRC error */ | |
99 | #define MMCST0_CRCRS BIT(7) /* command response CRC error */ | |
100 | #define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo empty) */ | |
101 | #define MMCST0_DRRDY BIT(10) /* data receive ready (data in fifo)*/ | |
102 | #define MMCST0_DATED BIT(11) /* DAT3 edge detect */ | |
103 | #define MMCST0_TRNDNE BIT(12) /* transfer done */ | |
104 | ||
105 | /* DAVINCI_MMCST1 definitions */ | |
106 | #define MMCST1_BUSY (1 << 0) | |
107 | ||
108 | /* DAVINCI_MMCCMD definitions */ | |
109 | #define MMCCMD_CMD_MASK (0x3F << 0) | |
110 | #define MMCCMD_PPLEN (1 << 7) | |
111 | #define MMCCMD_BSYEXP (1 << 8) | |
112 | #define MMCCMD_RSPFMT_MASK (3 << 9) | |
113 | #define MMCCMD_RSPFMT_NONE (0 << 9) | |
114 | #define MMCCMD_RSPFMT_R1456 (1 << 9) | |
115 | #define MMCCMD_RSPFMT_R2 (2 << 9) | |
116 | #define MMCCMD_RSPFMT_R3 (3 << 9) | |
117 | #define MMCCMD_DTRW (1 << 11) | |
118 | #define MMCCMD_STRMTP (1 << 12) | |
119 | #define MMCCMD_WDATX (1 << 13) | |
120 | #define MMCCMD_INITCK (1 << 14) | |
121 | #define MMCCMD_DCLR (1 << 15) | |
122 | #define MMCCMD_DMATRIG (1 << 16) | |
123 | ||
124 | /* DAVINCI_MMCFIFOCTL definitions */ | |
125 | #define MMCFIFOCTL_FIFORST (1 << 0) | |
126 | #define MMCFIFOCTL_FIFODIR_WR (1 << 1) | |
127 | #define MMCFIFOCTL_FIFODIR_RD (0 << 1) | |
128 | #define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits */ | |
129 | #define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes */ | |
130 | #define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes */ | |
131 | #define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes */ | |
132 | #define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte */ | |
133 | ||
f9db92cb AS |
134 | /* DAVINCI_SDIOST0 definitions */ |
135 | #define SDIOST0_DAT1_HI BIT(0) | |
136 | ||
137 | /* DAVINCI_SDIOIEN definitions */ | |
138 | #define SDIOIEN_IOINTEN BIT(0) | |
139 | ||
140 | /* DAVINCI_SDIOIST definitions */ | |
141 | #define SDIOIST_IOINT BIT(0) | |
b4cff454 VB |
142 | |
143 | /* MMCSD Init clock in Hz in opendrain mode */ | |
144 | #define MMCSD_INIT_CLOCK 200000 | |
145 | ||
146 | /* | |
147 | * One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units, | |
ca2afb6d | 148 | * and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only |
a36274e0 | 149 | * for drivers with max_segs == 1, making the segments bigger (64KB) |
ca2afb6d SR |
150 | * than the page or two that's otherwise typical. nr_sg (passed from |
151 | * platform data) == 16 gives at least the same throughput boost, using | |
152 | * EDMA transfer linkage instead of spending CPU time copying pages. | |
b4cff454 VB |
153 | */ |
154 | #define MAX_CCNT ((1 << 16) - 1) | |
155 | ||
ca2afb6d | 156 | #define MAX_NR_SG 16 |
b4cff454 VB |
157 | |
158 | static unsigned rw_threshold = 32; | |
159 | module_param(rw_threshold, uint, S_IRUGO); | |
160 | MODULE_PARM_DESC(rw_threshold, | |
161 | "Read/Write threshold. Default = 32"); | |
162 | ||
163 | static unsigned __initdata use_dma = 1; | |
164 | module_param(use_dma, uint, 0); | |
165 | MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1"); | |
166 | ||
167 | struct mmc_davinci_host { | |
168 | struct mmc_command *cmd; | |
169 | struct mmc_data *data; | |
170 | struct mmc_host *mmc; | |
171 | struct clk *clk; | |
172 | unsigned int mmc_input_clk; | |
173 | void __iomem *base; | |
174 | struct resource *mem_res; | |
f9db92cb | 175 | int mmc_irq, sdio_irq; |
b4cff454 VB |
176 | unsigned char bus_mode; |
177 | ||
178 | #define DAVINCI_MMC_DATADIR_NONE 0 | |
179 | #define DAVINCI_MMC_DATADIR_READ 1 | |
180 | #define DAVINCI_MMC_DATADIR_WRITE 2 | |
181 | unsigned char data_dir; | |
bbce5802 | 182 | unsigned char suspended; |
b4cff454 VB |
183 | |
184 | /* buffer is used during PIO of one scatterlist segment, and | |
185 | * is updated along with buffer_bytes_left. bytes_left applies | |
186 | * to all N blocks of the PIO transfer. | |
187 | */ | |
188 | u8 *buffer; | |
189 | u32 buffer_bytes_left; | |
190 | u32 bytes_left; | |
191 | ||
3d348aaf | 192 | u32 rxdma, txdma; |
b4cff454 VB |
193 | bool use_dma; |
194 | bool do_dma; | |
f9db92cb | 195 | bool sdio_int; |
b4cff454 VB |
196 | |
197 | /* Scatterlist DMA uses one or more parameter RAM entries: | |
198 | * the main one (associated with rxdma or txdma) plus zero or | |
199 | * more links. The entries for a given transfer differ only | |
200 | * by memory buffer (address, length) and link field. | |
201 | */ | |
202 | struct edmacc_param tx_template; | |
203 | struct edmacc_param rx_template; | |
204 | unsigned n_link; | |
ca2afb6d | 205 | u32 links[MAX_NR_SG - 1]; |
b4cff454 VB |
206 | |
207 | /* For PIO we walk scatterlists one segment at a time. */ | |
208 | unsigned int sg_len; | |
209 | struct scatterlist *sg; | |
210 | ||
211 | /* Version of the MMC/SD controller */ | |
212 | u8 version; | |
213 | /* for ns in one cycle calculation */ | |
214 | unsigned ns_in_one_cycle; | |
ca2afb6d SR |
215 | /* Number of sg segments */ |
216 | u8 nr_sg; | |
7e30b8de C |
217 | #ifdef CONFIG_CPU_FREQ |
218 | struct notifier_block freq_transition; | |
219 | #endif | |
b4cff454 VB |
220 | }; |
221 | ||
222 | ||
223 | /* PIO only */ | |
224 | static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host) | |
225 | { | |
226 | host->buffer_bytes_left = sg_dma_len(host->sg); | |
227 | host->buffer = sg_virt(host->sg); | |
228 | if (host->buffer_bytes_left > host->bytes_left) | |
229 | host->buffer_bytes_left = host->bytes_left; | |
230 | } | |
231 | ||
232 | static void davinci_fifo_data_trans(struct mmc_davinci_host *host, | |
233 | unsigned int n) | |
234 | { | |
235 | u8 *p; | |
236 | unsigned int i; | |
237 | ||
238 | if (host->buffer_bytes_left == 0) { | |
239 | host->sg = sg_next(host->data->sg); | |
240 | mmc_davinci_sg_to_buf(host); | |
241 | } | |
242 | ||
243 | p = host->buffer; | |
244 | if (n > host->buffer_bytes_left) | |
245 | n = host->buffer_bytes_left; | |
246 | host->buffer_bytes_left -= n; | |
247 | host->bytes_left -= n; | |
248 | ||
249 | /* NOTE: we never transfer more than rw_threshold bytes | |
250 | * to/from the fifo here; there's no I/O overlap. | |
251 | * This also assumes that access width( i.e. ACCWD) is 4 bytes | |
252 | */ | |
253 | if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) { | |
254 | for (i = 0; i < (n >> 2); i++) { | |
255 | writel(*((u32 *)p), host->base + DAVINCI_MMCDXR); | |
256 | p = p + 4; | |
257 | } | |
258 | if (n & 3) { | |
259 | iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3)); | |
260 | p = p + (n & 3); | |
261 | } | |
262 | } else { | |
263 | for (i = 0; i < (n >> 2); i++) { | |
264 | *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR); | |
265 | p = p + 4; | |
266 | } | |
267 | if (n & 3) { | |
268 | ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3)); | |
269 | p = p + (n & 3); | |
270 | } | |
271 | } | |
272 | host->buffer = p; | |
273 | } | |
274 | ||
275 | static void mmc_davinci_start_command(struct mmc_davinci_host *host, | |
276 | struct mmc_command *cmd) | |
277 | { | |
278 | u32 cmd_reg = 0; | |
279 | u32 im_val; | |
280 | ||
281 | dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n", | |
282 | cmd->opcode, cmd->arg, | |
283 | ({ char *s; | |
284 | switch (mmc_resp_type(cmd)) { | |
285 | case MMC_RSP_R1: | |
286 | s = ", R1/R5/R6/R7 response"; | |
287 | break; | |
288 | case MMC_RSP_R1B: | |
289 | s = ", R1b response"; | |
290 | break; | |
291 | case MMC_RSP_R2: | |
292 | s = ", R2 response"; | |
293 | break; | |
294 | case MMC_RSP_R3: | |
295 | s = ", R3/R4 response"; | |
296 | break; | |
297 | default: | |
298 | s = ", (R? response)"; | |
299 | break; | |
300 | }; s; })); | |
301 | host->cmd = cmd; | |
302 | ||
303 | switch (mmc_resp_type(cmd)) { | |
304 | case MMC_RSP_R1B: | |
305 | /* There's some spec confusion about when R1B is | |
306 | * allowed, but if the card doesn't issue a BUSY | |
307 | * then it's harmless for us to allow it. | |
308 | */ | |
309 | cmd_reg |= MMCCMD_BSYEXP; | |
310 | /* FALLTHROUGH */ | |
311 | case MMC_RSP_R1: /* 48 bits, CRC */ | |
312 | cmd_reg |= MMCCMD_RSPFMT_R1456; | |
313 | break; | |
314 | case MMC_RSP_R2: /* 136 bits, CRC */ | |
315 | cmd_reg |= MMCCMD_RSPFMT_R2; | |
316 | break; | |
317 | case MMC_RSP_R3: /* 48 bits, no CRC */ | |
318 | cmd_reg |= MMCCMD_RSPFMT_R3; | |
319 | break; | |
320 | default: | |
321 | cmd_reg |= MMCCMD_RSPFMT_NONE; | |
322 | dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n", | |
323 | mmc_resp_type(cmd)); | |
324 | break; | |
325 | } | |
326 | ||
327 | /* Set command index */ | |
328 | cmd_reg |= cmd->opcode; | |
329 | ||
330 | /* Enable EDMA transfer triggers */ | |
331 | if (host->do_dma) | |
332 | cmd_reg |= MMCCMD_DMATRIG; | |
333 | ||
334 | if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL && | |
335 | host->data_dir == DAVINCI_MMC_DATADIR_READ) | |
336 | cmd_reg |= MMCCMD_DMATRIG; | |
337 | ||
338 | /* Setting whether command involves data transfer or not */ | |
339 | if (cmd->data) | |
340 | cmd_reg |= MMCCMD_WDATX; | |
341 | ||
342 | /* Setting whether stream or block transfer */ | |
343 | if (cmd->flags & MMC_DATA_STREAM) | |
344 | cmd_reg |= MMCCMD_STRMTP; | |
345 | ||
346 | /* Setting whether data read or write */ | |
347 | if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) | |
348 | cmd_reg |= MMCCMD_DTRW; | |
349 | ||
350 | if (host->bus_mode == MMC_BUSMODE_PUSHPULL) | |
351 | cmd_reg |= MMCCMD_PPLEN; | |
352 | ||
353 | /* set Command timeout */ | |
354 | writel(0x1FFF, host->base + DAVINCI_MMCTOR); | |
355 | ||
356 | /* Enable interrupt (calculate here, defer until FIFO is stuffed). */ | |
357 | im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS; | |
358 | if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) { | |
359 | im_val |= MMCST0_DATDNE | MMCST0_CRCWR; | |
360 | ||
361 | if (!host->do_dma) | |
362 | im_val |= MMCST0_DXRDY; | |
363 | } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) { | |
364 | im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD; | |
365 | ||
366 | if (!host->do_dma) | |
367 | im_val |= MMCST0_DRRDY; | |
368 | } | |
369 | ||
370 | /* | |
371 | * Before non-DMA WRITE commands the controller needs priming: | |
372 | * FIFO should be populated with 32 bytes i.e. whatever is the FIFO size | |
373 | */ | |
374 | if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)) | |
375 | davinci_fifo_data_trans(host, rw_threshold); | |
376 | ||
377 | writel(cmd->arg, host->base + DAVINCI_MMCARGHL); | |
378 | writel(cmd_reg, host->base + DAVINCI_MMCCMD); | |
379 | writel(im_val, host->base + DAVINCI_MMCIM); | |
380 | } | |
381 | ||
382 | /*----------------------------------------------------------------------*/ | |
383 | ||
384 | /* DMA infrastructure */ | |
385 | ||
386 | static void davinci_abort_dma(struct mmc_davinci_host *host) | |
387 | { | |
388 | int sync_dev; | |
389 | ||
390 | if (host->data_dir == DAVINCI_MMC_DATADIR_READ) | |
391 | sync_dev = host->rxdma; | |
392 | else | |
393 | sync_dev = host->txdma; | |
394 | ||
395 | edma_stop(sync_dev); | |
396 | edma_clean_channel(sync_dev); | |
397 | } | |
398 | ||
399 | static void | |
400 | mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data); | |
401 | ||
402 | static void mmc_davinci_dma_cb(unsigned channel, u16 ch_status, void *data) | |
403 | { | |
404 | if (DMA_COMPLETE != ch_status) { | |
405 | struct mmc_davinci_host *host = data; | |
406 | ||
407 | /* Currently means: DMA Event Missed, or "null" transfer | |
408 | * request was seen. In the future, TC errors (like bad | |
409 | * addresses) might be presented too. | |
410 | */ | |
411 | dev_warn(mmc_dev(host->mmc), "DMA %s error\n", | |
412 | (host->data->flags & MMC_DATA_WRITE) | |
413 | ? "write" : "read"); | |
414 | host->data->error = -EIO; | |
415 | mmc_davinci_xfer_done(host, host->data); | |
416 | } | |
417 | } | |
418 | ||
419 | /* Set up tx or rx template, to be modified and updated later */ | |
420 | static void __init mmc_davinci_dma_setup(struct mmc_davinci_host *host, | |
421 | bool tx, struct edmacc_param *template) | |
422 | { | |
423 | unsigned sync_dev; | |
424 | const u16 acnt = 4; | |
425 | const u16 bcnt = rw_threshold >> 2; | |
426 | const u16 ccnt = 0; | |
427 | u32 src_port = 0; | |
428 | u32 dst_port = 0; | |
429 | s16 src_bidx, dst_bidx; | |
430 | s16 src_cidx, dst_cidx; | |
431 | ||
432 | /* | |
433 | * A-B Sync transfer: each DMA request is for one "frame" of | |
434 | * rw_threshold bytes, broken into "acnt"-size chunks repeated | |
435 | * "bcnt" times. Each segment needs "ccnt" such frames; since | |
436 | * we tell the block layer our mmc->max_seg_size limit, we can | |
437 | * trust (later) that it's within bounds. | |
438 | * | |
439 | * The FIFOs are read/written in 4-byte chunks (acnt == 4) and | |
440 | * EDMA will optimize memory operations to use larger bursts. | |
441 | */ | |
442 | if (tx) { | |
443 | sync_dev = host->txdma; | |
444 | ||
445 | /* src_prt, ccnt, and link to be set up later */ | |
446 | src_bidx = acnt; | |
447 | src_cidx = acnt * bcnt; | |
448 | ||
449 | dst_port = host->mem_res->start + DAVINCI_MMCDXR; | |
450 | dst_bidx = 0; | |
451 | dst_cidx = 0; | |
452 | } else { | |
453 | sync_dev = host->rxdma; | |
454 | ||
455 | src_port = host->mem_res->start + DAVINCI_MMCDRR; | |
456 | src_bidx = 0; | |
457 | src_cidx = 0; | |
458 | ||
459 | /* dst_prt, ccnt, and link to be set up later */ | |
460 | dst_bidx = acnt; | |
461 | dst_cidx = acnt * bcnt; | |
462 | } | |
463 | ||
464 | /* | |
465 | * We can't use FIFO mode for the FIFOs because MMC FIFO addresses | |
466 | * are not 256-bit (32-byte) aligned. So we use INCR, and the W8BIT | |
467 | * parameter is ignored. | |
468 | */ | |
469 | edma_set_src(sync_dev, src_port, INCR, W8BIT); | |
470 | edma_set_dest(sync_dev, dst_port, INCR, W8BIT); | |
471 | ||
472 | edma_set_src_index(sync_dev, src_bidx, src_cidx); | |
473 | edma_set_dest_index(sync_dev, dst_bidx, dst_cidx); | |
474 | ||
475 | edma_set_transfer_params(sync_dev, acnt, bcnt, ccnt, 8, ABSYNC); | |
476 | ||
477 | edma_read_slot(sync_dev, template); | |
478 | ||
479 | /* don't bother with irqs or chaining */ | |
480 | template->opt |= EDMA_CHAN_SLOT(sync_dev) << 12; | |
481 | } | |
482 | ||
483 | static void mmc_davinci_send_dma_request(struct mmc_davinci_host *host, | |
484 | struct mmc_data *data) | |
485 | { | |
486 | struct edmacc_param *template; | |
487 | int channel, slot; | |
488 | unsigned link; | |
489 | struct scatterlist *sg; | |
490 | unsigned sg_len; | |
491 | unsigned bytes_left = host->bytes_left; | |
150ee73d | 492 | const unsigned shift = ffs(rw_threshold) - 1; |
b4cff454 VB |
493 | |
494 | if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) { | |
495 | template = &host->tx_template; | |
496 | channel = host->txdma; | |
497 | } else { | |
498 | template = &host->rx_template; | |
499 | channel = host->rxdma; | |
500 | } | |
501 | ||
502 | /* We know sg_len and ccnt will never be out of range because | |
503 | * we told the mmc layer which in turn tells the block layer | |
504 | * to ensure that it only hands us one scatterlist segment | |
505 | * per EDMA PARAM entry. Update the PARAM | |
506 | * entries needed for each segment of this scatterlist. | |
507 | */ | |
508 | for (slot = channel, link = 0, sg = data->sg, sg_len = host->sg_len; | |
509 | sg_len-- != 0 && bytes_left; | |
510 | sg = sg_next(sg), slot = host->links[link++]) { | |
511 | u32 buf = sg_dma_address(sg); | |
512 | unsigned count = sg_dma_len(sg); | |
513 | ||
514 | template->link_bcntrld = sg_len | |
515 | ? (EDMA_CHAN_SLOT(host->links[link]) << 5) | |
516 | : 0xffff; | |
517 | ||
518 | if (count > bytes_left) | |
519 | count = bytes_left; | |
520 | bytes_left -= count; | |
521 | ||
522 | if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) | |
523 | template->src = buf; | |
524 | else | |
525 | template->dst = buf; | |
526 | template->ccnt = count >> shift; | |
527 | ||
528 | edma_write_slot(slot, template); | |
529 | } | |
530 | ||
531 | if (host->version == MMC_CTLR_VERSION_2) | |
532 | edma_clear_event(channel); | |
533 | ||
534 | edma_start(channel); | |
535 | } | |
536 | ||
537 | static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host, | |
538 | struct mmc_data *data) | |
539 | { | |
540 | int i; | |
541 | int mask = rw_threshold - 1; | |
542 | ||
543 | host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, | |
544 | ((data->flags & MMC_DATA_WRITE) | |
545 | ? DMA_TO_DEVICE | |
546 | : DMA_FROM_DEVICE)); | |
547 | ||
548 | /* no individual DMA segment should need a partial FIFO */ | |
549 | for (i = 0; i < host->sg_len; i++) { | |
550 | if (sg_dma_len(data->sg + i) & mask) { | |
551 | dma_unmap_sg(mmc_dev(host->mmc), | |
552 | data->sg, data->sg_len, | |
553 | (data->flags & MMC_DATA_WRITE) | |
554 | ? DMA_TO_DEVICE | |
555 | : DMA_FROM_DEVICE); | |
556 | return -1; | |
557 | } | |
558 | } | |
559 | ||
560 | host->do_dma = 1; | |
561 | mmc_davinci_send_dma_request(host, data); | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static void __init_or_module | |
567 | davinci_release_dma_channels(struct mmc_davinci_host *host) | |
568 | { | |
569 | unsigned i; | |
570 | ||
571 | if (!host->use_dma) | |
572 | return; | |
573 | ||
574 | for (i = 0; i < host->n_link; i++) | |
575 | edma_free_slot(host->links[i]); | |
576 | ||
577 | edma_free_channel(host->txdma); | |
578 | edma_free_channel(host->rxdma); | |
579 | } | |
580 | ||
581 | static int __init davinci_acquire_dma_channels(struct mmc_davinci_host *host) | |
582 | { | |
ca2afb6d | 583 | u32 link_size; |
b4cff454 VB |
584 | int r, i; |
585 | ||
586 | /* Acquire master DMA write channel */ | |
587 | r = edma_alloc_channel(host->txdma, mmc_davinci_dma_cb, host, | |
588 | EVENTQ_DEFAULT); | |
589 | if (r < 0) { | |
590 | dev_warn(mmc_dev(host->mmc), "alloc %s channel err %d\n", | |
591 | "tx", r); | |
592 | return r; | |
593 | } | |
594 | mmc_davinci_dma_setup(host, true, &host->tx_template); | |
595 | ||
596 | /* Acquire master DMA read channel */ | |
597 | r = edma_alloc_channel(host->rxdma, mmc_davinci_dma_cb, host, | |
598 | EVENTQ_DEFAULT); | |
599 | if (r < 0) { | |
600 | dev_warn(mmc_dev(host->mmc), "alloc %s channel err %d\n", | |
601 | "rx", r); | |
602 | goto free_master_write; | |
603 | } | |
604 | mmc_davinci_dma_setup(host, false, &host->rx_template); | |
605 | ||
606 | /* Allocate parameter RAM slots, which will later be bound to a | |
607 | * channel as needed to handle a scatterlist. | |
608 | */ | |
ca2afb6d SR |
609 | link_size = min_t(unsigned, host->nr_sg, ARRAY_SIZE(host->links)); |
610 | for (i = 0; i < link_size; i++) { | |
b4cff454 VB |
611 | r = edma_alloc_slot(EDMA_CTLR(host->txdma), EDMA_SLOT_ANY); |
612 | if (r < 0) { | |
613 | dev_dbg(mmc_dev(host->mmc), "dma PaRAM alloc --> %d\n", | |
614 | r); | |
615 | break; | |
616 | } | |
617 | host->links[i] = r; | |
618 | } | |
619 | host->n_link = i; | |
620 | ||
621 | return 0; | |
622 | ||
623 | free_master_write: | |
624 | edma_free_channel(host->txdma); | |
625 | ||
626 | return r; | |
627 | } | |
628 | ||
629 | /*----------------------------------------------------------------------*/ | |
630 | ||
631 | static void | |
632 | mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req) | |
633 | { | |
634 | int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0; | |
635 | int timeout; | |
636 | struct mmc_data *data = req->data; | |
637 | ||
638 | if (host->version == MMC_CTLR_VERSION_2) | |
639 | fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0; | |
640 | ||
641 | host->data = data; | |
642 | if (data == NULL) { | |
643 | host->data_dir = DAVINCI_MMC_DATADIR_NONE; | |
644 | writel(0, host->base + DAVINCI_MMCBLEN); | |
645 | writel(0, host->base + DAVINCI_MMCNBLK); | |
646 | return; | |
647 | } | |
648 | ||
649 | dev_dbg(mmc_dev(host->mmc), "%s %s, %d blocks of %d bytes\n", | |
650 | (data->flags & MMC_DATA_STREAM) ? "stream" : "block", | |
651 | (data->flags & MMC_DATA_WRITE) ? "write" : "read", | |
652 | data->blocks, data->blksz); | |
653 | dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n", | |
654 | data->timeout_clks, data->timeout_ns); | |
655 | timeout = data->timeout_clks + | |
656 | (data->timeout_ns / host->ns_in_one_cycle); | |
657 | if (timeout > 0xffff) | |
658 | timeout = 0xffff; | |
659 | ||
660 | writel(timeout, host->base + DAVINCI_MMCTOD); | |
661 | writel(data->blocks, host->base + DAVINCI_MMCNBLK); | |
662 | writel(data->blksz, host->base + DAVINCI_MMCBLEN); | |
663 | ||
664 | /* Configure the FIFO */ | |
665 | switch (data->flags & MMC_DATA_WRITE) { | |
666 | case MMC_DATA_WRITE: | |
667 | host->data_dir = DAVINCI_MMC_DATADIR_WRITE; | |
668 | writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST, | |
669 | host->base + DAVINCI_MMCFIFOCTL); | |
670 | writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR, | |
671 | host->base + DAVINCI_MMCFIFOCTL); | |
672 | break; | |
673 | ||
674 | default: | |
675 | host->data_dir = DAVINCI_MMC_DATADIR_READ; | |
676 | writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST, | |
677 | host->base + DAVINCI_MMCFIFOCTL); | |
678 | writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD, | |
679 | host->base + DAVINCI_MMCFIFOCTL); | |
680 | break; | |
681 | } | |
682 | ||
683 | host->buffer = NULL; | |
684 | host->bytes_left = data->blocks * data->blksz; | |
685 | ||
686 | /* For now we try to use DMA whenever we won't need partial FIFO | |
687 | * reads or writes, either for the whole transfer (as tested here) | |
688 | * or for any individual scatterlist segment (tested when we call | |
689 | * start_dma_transfer). | |
690 | * | |
691 | * While we *could* change that, unusual block sizes are rarely | |
692 | * used. The occasional fallback to PIO should't hurt. | |
693 | */ | |
694 | if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0 | |
695 | && mmc_davinci_start_dma_transfer(host, data) == 0) { | |
696 | /* zero this to ensure we take no PIO paths */ | |
697 | host->bytes_left = 0; | |
698 | } else { | |
699 | /* Revert to CPU Copy */ | |
700 | host->sg_len = data->sg_len; | |
701 | host->sg = host->data->sg; | |
702 | mmc_davinci_sg_to_buf(host); | |
703 | } | |
704 | } | |
705 | ||
706 | static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req) | |
707 | { | |
708 | struct mmc_davinci_host *host = mmc_priv(mmc); | |
709 | unsigned long timeout = jiffies + msecs_to_jiffies(900); | |
710 | u32 mmcst1 = 0; | |
711 | ||
712 | /* Card may still be sending BUSY after a previous operation, | |
713 | * typically some kind of write. If so, we can't proceed yet. | |
714 | */ | |
715 | while (time_before(jiffies, timeout)) { | |
716 | mmcst1 = readl(host->base + DAVINCI_MMCST1); | |
717 | if (!(mmcst1 & MMCST1_BUSY)) | |
718 | break; | |
719 | cpu_relax(); | |
720 | } | |
721 | if (mmcst1 & MMCST1_BUSY) { | |
722 | dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n"); | |
723 | req->cmd->error = -ETIMEDOUT; | |
724 | mmc_request_done(mmc, req); | |
725 | return; | |
726 | } | |
727 | ||
728 | host->do_dma = 0; | |
729 | mmc_davinci_prepare_data(host, req); | |
730 | mmc_davinci_start_command(host, req->cmd); | |
731 | } | |
732 | ||
733 | static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host, | |
734 | unsigned int mmc_req_freq) | |
735 | { | |
736 | unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0; | |
737 | ||
738 | mmc_pclk = host->mmc_input_clk; | |
739 | if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq)) | |
740 | mmc_push_pull_divisor = ((unsigned int)mmc_pclk | |
741 | / (2 * mmc_req_freq)) - 1; | |
742 | else | |
743 | mmc_push_pull_divisor = 0; | |
744 | ||
745 | mmc_freq = (unsigned int)mmc_pclk | |
746 | / (2 * (mmc_push_pull_divisor + 1)); | |
747 | ||
748 | if (mmc_freq > mmc_req_freq) | |
749 | mmc_push_pull_divisor = mmc_push_pull_divisor + 1; | |
750 | /* Convert ns to clock cycles */ | |
751 | if (mmc_req_freq <= 400000) | |
752 | host->ns_in_one_cycle = (1000000) / (((mmc_pclk | |
753 | / (2 * (mmc_push_pull_divisor + 1)))/1000)); | |
754 | else | |
755 | host->ns_in_one_cycle = (1000000) / (((mmc_pclk | |
756 | / (2 * (mmc_push_pull_divisor + 1)))/1000000)); | |
757 | ||
758 | return mmc_push_pull_divisor; | |
759 | } | |
760 | ||
7e30b8de | 761 | static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios) |
b4cff454 VB |
762 | { |
763 | unsigned int open_drain_freq = 0, mmc_pclk = 0; | |
764 | unsigned int mmc_push_pull_freq = 0; | |
765 | struct mmc_davinci_host *host = mmc_priv(mmc); | |
766 | ||
b4cff454 VB |
767 | if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) { |
768 | u32 temp; | |
769 | ||
770 | /* Ignoring the init clock value passed for fixing the inter | |
771 | * operability with different cards. | |
772 | */ | |
773 | open_drain_freq = ((unsigned int)mmc_pclk | |
774 | / (2 * MMCSD_INIT_CLOCK)) - 1; | |
775 | ||
776 | if (open_drain_freq > 0xFF) | |
777 | open_drain_freq = 0xFF; | |
778 | ||
779 | temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK; | |
780 | temp |= open_drain_freq; | |
781 | writel(temp, host->base + DAVINCI_MMCCLK); | |
782 | ||
783 | /* Convert ns to clock cycles */ | |
784 | host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000); | |
785 | } else { | |
786 | u32 temp; | |
787 | mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock); | |
788 | ||
789 | if (mmc_push_pull_freq > 0xFF) | |
790 | mmc_push_pull_freq = 0xFF; | |
791 | ||
792 | temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN; | |
793 | writel(temp, host->base + DAVINCI_MMCCLK); | |
794 | ||
795 | udelay(10); | |
796 | ||
797 | temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK; | |
798 | temp |= mmc_push_pull_freq; | |
799 | writel(temp, host->base + DAVINCI_MMCCLK); | |
800 | ||
801 | writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK); | |
802 | ||
803 | udelay(10); | |
804 | } | |
7e30b8de C |
805 | } |
806 | ||
807 | static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
808 | { | |
7e30b8de | 809 | struct mmc_davinci_host *host = mmc_priv(mmc); |
4a9de8ad IY |
810 | struct platform_device *pdev = to_platform_device(mmc->parent); |
811 | struct davinci_mmc_config *config = pdev->dev.platform_data; | |
7e30b8de | 812 | |
7e30b8de C |
813 | dev_dbg(mmc_dev(host->mmc), |
814 | "clock %dHz busmode %d powermode %d Vdd %04x\n", | |
815 | ios->clock, ios->bus_mode, ios->power_mode, | |
816 | ios->vdd); | |
132f1074 | 817 | |
4a9de8ad IY |
818 | switch (ios->power_mode) { |
819 | case MMC_POWER_OFF: | |
820 | if (config && config->set_power) | |
821 | config->set_power(pdev->id, false); | |
822 | break; | |
823 | case MMC_POWER_UP: | |
824 | if (config && config->set_power) | |
825 | config->set_power(pdev->id, true); | |
826 | break; | |
827 | } | |
828 | ||
132f1074 VB |
829 | switch (ios->bus_width) { |
830 | case MMC_BUS_WIDTH_8: | |
831 | dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n"); | |
832 | writel((readl(host->base + DAVINCI_MMCCTL) & | |
833 | ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT, | |
7e30b8de | 834 | host->base + DAVINCI_MMCCTL); |
132f1074 VB |
835 | break; |
836 | case MMC_BUS_WIDTH_4: | |
837 | dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n"); | |
838 | if (host->version == MMC_CTLR_VERSION_2) | |
839 | writel((readl(host->base + DAVINCI_MMCCTL) & | |
840 | ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT, | |
841 | host->base + DAVINCI_MMCCTL); | |
842 | else | |
843 | writel(readl(host->base + DAVINCI_MMCCTL) | | |
844 | MMCCTL_WIDTH_4_BIT, | |
845 | host->base + DAVINCI_MMCCTL); | |
846 | break; | |
847 | case MMC_BUS_WIDTH_1: | |
848 | dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n"); | |
849 | if (host->version == MMC_CTLR_VERSION_2) | |
850 | writel(readl(host->base + DAVINCI_MMCCTL) & | |
851 | ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT), | |
852 | host->base + DAVINCI_MMCCTL); | |
853 | else | |
854 | writel(readl(host->base + DAVINCI_MMCCTL) & | |
855 | ~MMCCTL_WIDTH_4_BIT, | |
856 | host->base + DAVINCI_MMCCTL); | |
857 | break; | |
7e30b8de C |
858 | } |
859 | ||
860 | calculate_clk_divider(mmc, ios); | |
b4cff454 VB |
861 | |
862 | host->bus_mode = ios->bus_mode; | |
863 | if (ios->power_mode == MMC_POWER_UP) { | |
864 | unsigned long timeout = jiffies + msecs_to_jiffies(50); | |
865 | bool lose = true; | |
866 | ||
867 | /* Send clock cycles, poll completion */ | |
868 | writel(0, host->base + DAVINCI_MMCARGHL); | |
869 | writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD); | |
870 | while (time_before(jiffies, timeout)) { | |
871 | u32 tmp = readl(host->base + DAVINCI_MMCST0); | |
872 | ||
873 | if (tmp & MMCST0_RSPDNE) { | |
874 | lose = false; | |
875 | break; | |
876 | } | |
877 | cpu_relax(); | |
878 | } | |
879 | if (lose) | |
880 | dev_warn(mmc_dev(host->mmc), "powerup timeout\n"); | |
881 | } | |
882 | ||
883 | /* FIXME on power OFF, reset things ... */ | |
884 | } | |
885 | ||
886 | static void | |
887 | mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data) | |
888 | { | |
889 | host->data = NULL; | |
890 | ||
f9db92cb AS |
891 | if (host->mmc->caps & MMC_CAP_SDIO_IRQ) { |
892 | /* | |
893 | * SDIO Interrupt Detection work-around as suggested by | |
894 | * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata | |
895 | * 2.1.6): Signal SDIO interrupt only if it is enabled by core | |
896 | */ | |
897 | if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) & | |
898 | SDIOST0_DAT1_HI)) { | |
899 | writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST); | |
900 | mmc_signal_sdio_irq(host->mmc); | |
901 | } | |
902 | } | |
903 | ||
b4cff454 VB |
904 | if (host->do_dma) { |
905 | davinci_abort_dma(host); | |
906 | ||
907 | dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, | |
908 | (data->flags & MMC_DATA_WRITE) | |
909 | ? DMA_TO_DEVICE | |
910 | : DMA_FROM_DEVICE); | |
911 | host->do_dma = false; | |
912 | } | |
913 | host->data_dir = DAVINCI_MMC_DATADIR_NONE; | |
914 | ||
915 | if (!data->stop || (host->cmd && host->cmd->error)) { | |
916 | mmc_request_done(host->mmc, data->mrq); | |
917 | writel(0, host->base + DAVINCI_MMCIM); | |
918 | } else | |
919 | mmc_davinci_start_command(host, data->stop); | |
920 | } | |
921 | ||
922 | static void mmc_davinci_cmd_done(struct mmc_davinci_host *host, | |
923 | struct mmc_command *cmd) | |
924 | { | |
925 | host->cmd = NULL; | |
926 | ||
927 | if (cmd->flags & MMC_RSP_PRESENT) { | |
928 | if (cmd->flags & MMC_RSP_136) { | |
929 | /* response type 2 */ | |
930 | cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01); | |
931 | cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23); | |
932 | cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45); | |
933 | cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67); | |
934 | } else { | |
935 | /* response types 1, 1b, 3, 4, 5, 6 */ | |
936 | cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67); | |
937 | } | |
938 | } | |
939 | ||
940 | if (host->data == NULL || cmd->error) { | |
941 | if (cmd->error == -ETIMEDOUT) | |
942 | cmd->mrq->cmd->retries = 0; | |
943 | mmc_request_done(host->mmc, cmd->mrq); | |
944 | writel(0, host->base + DAVINCI_MMCIM); | |
945 | } | |
946 | } | |
947 | ||
06de845f C |
948 | static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host, |
949 | int val) | |
b4cff454 VB |
950 | { |
951 | u32 temp; | |
952 | ||
b4cff454 | 953 | temp = readl(host->base + DAVINCI_MMCCTL); |
06de845f C |
954 | if (val) /* reset */ |
955 | temp |= MMCCTL_CMDRST | MMCCTL_DATRST; | |
956 | else /* enable */ | |
957 | temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST); | |
b4cff454 | 958 | |
b4cff454 | 959 | writel(temp, host->base + DAVINCI_MMCCTL); |
06de845f C |
960 | udelay(10); |
961 | } | |
962 | ||
963 | static void | |
964 | davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data) | |
965 | { | |
966 | mmc_davinci_reset_ctrl(host, 1); | |
967 | mmc_davinci_reset_ctrl(host, 0); | |
b4cff454 VB |
968 | } |
969 | ||
f9db92cb AS |
970 | static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id) |
971 | { | |
972 | struct mmc_davinci_host *host = dev_id; | |
973 | unsigned int status; | |
974 | ||
975 | status = readl(host->base + DAVINCI_SDIOIST); | |
976 | if (status & SDIOIST_IOINT) { | |
977 | dev_dbg(mmc_dev(host->mmc), | |
978 | "SDIO interrupt status %x\n", status); | |
979 | writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST); | |
980 | mmc_signal_sdio_irq(host->mmc); | |
981 | } | |
982 | return IRQ_HANDLED; | |
983 | } | |
984 | ||
b4cff454 VB |
985 | static irqreturn_t mmc_davinci_irq(int irq, void *dev_id) |
986 | { | |
987 | struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id; | |
988 | unsigned int status, qstatus; | |
989 | int end_command = 0; | |
990 | int end_transfer = 0; | |
991 | struct mmc_data *data = host->data; | |
992 | ||
993 | if (host->cmd == NULL && host->data == NULL) { | |
994 | status = readl(host->base + DAVINCI_MMCST0); | |
995 | dev_dbg(mmc_dev(host->mmc), | |
996 | "Spurious interrupt 0x%04x\n", status); | |
997 | /* Disable the interrupt from mmcsd */ | |
998 | writel(0, host->base + DAVINCI_MMCIM); | |
999 | return IRQ_NONE; | |
1000 | } | |
1001 | ||
1002 | status = readl(host->base + DAVINCI_MMCST0); | |
1003 | qstatus = status; | |
1004 | ||
1005 | /* handle FIFO first when using PIO for data. | |
1006 | * bytes_left will decrease to zero as I/O progress and status will | |
1007 | * read zero over iteration because this controller status | |
1008 | * register(MMCST0) reports any status only once and it is cleared | |
1009 | * by read. So, it is not unbouned loop even in the case of | |
1010 | * non-dma. | |
1011 | */ | |
1012 | while (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) { | |
1013 | davinci_fifo_data_trans(host, rw_threshold); | |
1014 | status = readl(host->base + DAVINCI_MMCST0); | |
1015 | if (!status) | |
1016 | break; | |
1017 | qstatus |= status; | |
1018 | } | |
1019 | ||
1020 | if (qstatus & MMCST0_DATDNE) { | |
1021 | /* All blocks sent/received, and CRC checks passed */ | |
1022 | if (data != NULL) { | |
1023 | if ((host->do_dma == 0) && (host->bytes_left > 0)) { | |
1024 | /* if datasize < rw_threshold | |
1025 | * no RX ints are generated | |
1026 | */ | |
1027 | davinci_fifo_data_trans(host, host->bytes_left); | |
1028 | } | |
1029 | end_transfer = 1; | |
1030 | data->bytes_xfered = data->blocks * data->blksz; | |
1031 | } else { | |
1032 | dev_err(mmc_dev(host->mmc), | |
1033 | "DATDNE with no host->data\n"); | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | if (qstatus & MMCST0_TOUTRD) { | |
1038 | /* Read data timeout */ | |
1039 | data->error = -ETIMEDOUT; | |
1040 | end_transfer = 1; | |
1041 | ||
1042 | dev_dbg(mmc_dev(host->mmc), | |
1043 | "read data timeout, status %x\n", | |
1044 | qstatus); | |
1045 | ||
1046 | davinci_abort_data(host, data); | |
1047 | } | |
1048 | ||
1049 | if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) { | |
1050 | /* Data CRC error */ | |
1051 | data->error = -EILSEQ; | |
1052 | end_transfer = 1; | |
1053 | ||
1054 | /* NOTE: this controller uses CRCWR to report both CRC | |
1055 | * errors and timeouts (on writes). MMCDRSP values are | |
1056 | * only weakly documented, but 0x9f was clearly a timeout | |
1057 | * case and the two three-bit patterns in various SD specs | |
1058 | * (101, 010) aren't part of it ... | |
1059 | */ | |
1060 | if (qstatus & MMCST0_CRCWR) { | |
1061 | u32 temp = readb(host->base + DAVINCI_MMCDRSP); | |
1062 | ||
1063 | if (temp == 0x9f) | |
1064 | data->error = -ETIMEDOUT; | |
1065 | } | |
1066 | dev_dbg(mmc_dev(host->mmc), "data %s %s error\n", | |
1067 | (qstatus & MMCST0_CRCWR) ? "write" : "read", | |
1068 | (data->error == -ETIMEDOUT) ? "timeout" : "CRC"); | |
1069 | ||
1070 | davinci_abort_data(host, data); | |
1071 | } | |
1072 | ||
1073 | if (qstatus & MMCST0_TOUTRS) { | |
1074 | /* Command timeout */ | |
1075 | if (host->cmd) { | |
1076 | dev_dbg(mmc_dev(host->mmc), | |
1077 | "CMD%d timeout, status %x\n", | |
1078 | host->cmd->opcode, qstatus); | |
1079 | host->cmd->error = -ETIMEDOUT; | |
1080 | if (data) { | |
1081 | end_transfer = 1; | |
1082 | davinci_abort_data(host, data); | |
1083 | } else | |
1084 | end_command = 1; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | if (qstatus & MMCST0_CRCRS) { | |
1089 | /* Command CRC error */ | |
1090 | dev_dbg(mmc_dev(host->mmc), "Command CRC error\n"); | |
1091 | if (host->cmd) { | |
1092 | host->cmd->error = -EILSEQ; | |
1093 | end_command = 1; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | if (qstatus & MMCST0_RSPDNE) { | |
1098 | /* End of command phase */ | |
1099 | end_command = (int) host->cmd; | |
1100 | } | |
1101 | ||
1102 | if (end_command) | |
1103 | mmc_davinci_cmd_done(host, host->cmd); | |
1104 | if (end_transfer) | |
1105 | mmc_davinci_xfer_done(host, data); | |
1106 | return IRQ_HANDLED; | |
1107 | } | |
1108 | ||
1109 | static int mmc_davinci_get_cd(struct mmc_host *mmc) | |
1110 | { | |
1111 | struct platform_device *pdev = to_platform_device(mmc->parent); | |
1112 | struct davinci_mmc_config *config = pdev->dev.platform_data; | |
1113 | ||
1114 | if (!config || !config->get_cd) | |
1115 | return -ENOSYS; | |
1116 | return config->get_cd(pdev->id); | |
1117 | } | |
1118 | ||
1119 | static int mmc_davinci_get_ro(struct mmc_host *mmc) | |
1120 | { | |
1121 | struct platform_device *pdev = to_platform_device(mmc->parent); | |
1122 | struct davinci_mmc_config *config = pdev->dev.platform_data; | |
1123 | ||
1124 | if (!config || !config->get_ro) | |
1125 | return -ENOSYS; | |
1126 | return config->get_ro(pdev->id); | |
1127 | } | |
1128 | ||
f9db92cb AS |
1129 | static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable) |
1130 | { | |
1131 | struct mmc_davinci_host *host = mmc_priv(mmc); | |
1132 | ||
1133 | if (enable) { | |
1134 | if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) { | |
1135 | writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST); | |
1136 | mmc_signal_sdio_irq(host->mmc); | |
1137 | } else { | |
1138 | host->sdio_int = true; | |
1139 | writel(readl(host->base + DAVINCI_SDIOIEN) | | |
1140 | SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN); | |
1141 | } | |
1142 | } else { | |
1143 | host->sdio_int = false; | |
1144 | writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN, | |
1145 | host->base + DAVINCI_SDIOIEN); | |
1146 | } | |
1147 | } | |
1148 | ||
b4cff454 VB |
1149 | static struct mmc_host_ops mmc_davinci_ops = { |
1150 | .request = mmc_davinci_request, | |
1151 | .set_ios = mmc_davinci_set_ios, | |
1152 | .get_cd = mmc_davinci_get_cd, | |
1153 | .get_ro = mmc_davinci_get_ro, | |
f9db92cb | 1154 | .enable_sdio_irq = mmc_davinci_enable_sdio_irq, |
b4cff454 VB |
1155 | }; |
1156 | ||
1157 | /*----------------------------------------------------------------------*/ | |
1158 | ||
7e30b8de C |
1159 | #ifdef CONFIG_CPU_FREQ |
1160 | static int mmc_davinci_cpufreq_transition(struct notifier_block *nb, | |
1161 | unsigned long val, void *data) | |
1162 | { | |
1163 | struct mmc_davinci_host *host; | |
1164 | unsigned int mmc_pclk; | |
1165 | struct mmc_host *mmc; | |
1166 | unsigned long flags; | |
1167 | ||
1168 | host = container_of(nb, struct mmc_davinci_host, freq_transition); | |
1169 | mmc = host->mmc; | |
1170 | mmc_pclk = clk_get_rate(host->clk); | |
1171 | ||
1172 | if (val == CPUFREQ_POSTCHANGE) { | |
1173 | spin_lock_irqsave(&mmc->lock, flags); | |
1174 | host->mmc_input_clk = mmc_pclk; | |
1175 | calculate_clk_divider(mmc, &mmc->ios); | |
1176 | spin_unlock_irqrestore(&mmc->lock, flags); | |
1177 | } | |
1178 | ||
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host) | |
1183 | { | |
1184 | host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition; | |
1185 | ||
1186 | return cpufreq_register_notifier(&host->freq_transition, | |
1187 | CPUFREQ_TRANSITION_NOTIFIER); | |
1188 | } | |
1189 | ||
1190 | static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host) | |
1191 | { | |
1192 | cpufreq_unregister_notifier(&host->freq_transition, | |
1193 | CPUFREQ_TRANSITION_NOTIFIER); | |
1194 | } | |
1195 | #else | |
1196 | static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host) | |
1197 | { | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host) | |
1202 | { | |
1203 | } | |
1204 | #endif | |
b4cff454 VB |
1205 | static void __init init_mmcsd_host(struct mmc_davinci_host *host) |
1206 | { | |
b4cff454 | 1207 | |
06de845f | 1208 | mmc_davinci_reset_ctrl(host, 1); |
b4cff454 VB |
1209 | |
1210 | writel(0, host->base + DAVINCI_MMCCLK); | |
1211 | writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK); | |
1212 | ||
1213 | writel(0x1FFF, host->base + DAVINCI_MMCTOR); | |
1214 | writel(0xFFFF, host->base + DAVINCI_MMCTOD); | |
1215 | ||
06de845f | 1216 | mmc_davinci_reset_ctrl(host, 0); |
b4cff454 VB |
1217 | } |
1218 | ||
1219 | static int __init davinci_mmcsd_probe(struct platform_device *pdev) | |
1220 | { | |
1221 | struct davinci_mmc_config *pdata = pdev->dev.platform_data; | |
1222 | struct mmc_davinci_host *host = NULL; | |
1223 | struct mmc_host *mmc = NULL; | |
1224 | struct resource *r, *mem = NULL; | |
1225 | int ret = 0, irq = 0; | |
1226 | size_t mem_size; | |
1227 | ||
1228 | /* REVISIT: when we're fully converted, fail if pdata is NULL */ | |
1229 | ||
1230 | ret = -ENODEV; | |
1231 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1232 | irq = platform_get_irq(pdev, 0); | |
1233 | if (!r || irq == NO_IRQ) | |
1234 | goto out; | |
1235 | ||
1236 | ret = -EBUSY; | |
1237 | mem_size = resource_size(r); | |
1238 | mem = request_mem_region(r->start, mem_size, pdev->name); | |
1239 | if (!mem) | |
1240 | goto out; | |
1241 | ||
1242 | ret = -ENOMEM; | |
1243 | mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev); | |
1244 | if (!mmc) | |
1245 | goto out; | |
1246 | ||
1247 | host = mmc_priv(mmc); | |
1248 | host->mmc = mmc; /* Important */ | |
1249 | ||
1250 | r = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
1251 | if (!r) | |
1252 | goto out; | |
1253 | host->rxdma = r->start; | |
1254 | ||
1255 | r = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
1256 | if (!r) | |
1257 | goto out; | |
1258 | host->txdma = r->start; | |
1259 | ||
1260 | host->mem_res = mem; | |
1261 | host->base = ioremap(mem->start, mem_size); | |
1262 | if (!host->base) | |
1263 | goto out; | |
1264 | ||
1265 | ret = -ENXIO; | |
1266 | host->clk = clk_get(&pdev->dev, "MMCSDCLK"); | |
1267 | if (IS_ERR(host->clk)) { | |
1268 | ret = PTR_ERR(host->clk); | |
1269 | goto out; | |
1270 | } | |
1271 | clk_enable(host->clk); | |
1272 | host->mmc_input_clk = clk_get_rate(host->clk); | |
1273 | ||
1274 | init_mmcsd_host(host); | |
1275 | ||
ca2afb6d SR |
1276 | if (pdata->nr_sg) |
1277 | host->nr_sg = pdata->nr_sg - 1; | |
1278 | ||
1279 | if (host->nr_sg > MAX_NR_SG || !host->nr_sg) | |
1280 | host->nr_sg = MAX_NR_SG; | |
1281 | ||
b4cff454 | 1282 | host->use_dma = use_dma; |
f9db92cb AS |
1283 | host->mmc_irq = irq; |
1284 | host->sdio_irq = platform_get_irq(pdev, 1); | |
b4cff454 VB |
1285 | |
1286 | if (host->use_dma && davinci_acquire_dma_channels(host) != 0) | |
1287 | host->use_dma = 0; | |
1288 | ||
1289 | /* REVISIT: someday, support IRQ-driven card detection. */ | |
1290 | mmc->caps |= MMC_CAP_NEEDS_POLL; | |
132f1074 | 1291 | mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; |
b4cff454 | 1292 | |
132f1074 | 1293 | if (pdata && (pdata->wires == 4 || pdata->wires == 0)) |
b4cff454 VB |
1294 | mmc->caps |= MMC_CAP_4_BIT_DATA; |
1295 | ||
132f1074 VB |
1296 | if (pdata && (pdata->wires == 8)) |
1297 | mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA); | |
1298 | ||
b4cff454 VB |
1299 | host->version = pdata->version; |
1300 | ||
1301 | mmc->ops = &mmc_davinci_ops; | |
1302 | mmc->f_min = 312500; | |
1303 | mmc->f_max = 25000000; | |
1304 | if (pdata && pdata->max_freq) | |
1305 | mmc->f_max = pdata->max_freq; | |
1306 | if (pdata && pdata->caps) | |
1307 | mmc->caps |= pdata->caps; | |
1308 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; | |
1309 | ||
1310 | /* With no iommu coalescing pages, each phys_seg is a hw_seg. | |
1311 | * Each hw_seg uses one EDMA parameter RAM slot, always one | |
1312 | * channel and then usually some linked slots. | |
1313 | */ | |
a36274e0 | 1314 | mmc->max_segs = 1 + host->n_link; |
b4cff454 VB |
1315 | |
1316 | /* EDMA limit per hw segment (one or two MBytes) */ | |
1317 | mmc->max_seg_size = MAX_CCNT * rw_threshold; | |
1318 | ||
1319 | /* MMC/SD controller limits for multiblock requests */ | |
1320 | mmc->max_blk_size = 4095; /* BLEN is 12 bits */ | |
1321 | mmc->max_blk_count = 65535; /* NBLK is 16 bits */ | |
1322 | mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; | |
1323 | ||
a36274e0 | 1324 | dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs); |
b4cff454 VB |
1325 | dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size); |
1326 | dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size); | |
1327 | dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size); | |
1328 | ||
1329 | platform_set_drvdata(pdev, host); | |
1330 | ||
7e30b8de C |
1331 | ret = mmc_davinci_cpufreq_register(host); |
1332 | if (ret) { | |
1333 | dev_err(&pdev->dev, "failed to register cpufreq\n"); | |
1334 | goto cpu_freq_fail; | |
1335 | } | |
1336 | ||
b4cff454 VB |
1337 | ret = mmc_add_host(mmc); |
1338 | if (ret < 0) | |
1339 | goto out; | |
1340 | ||
1341 | ret = request_irq(irq, mmc_davinci_irq, 0, mmc_hostname(mmc), host); | |
1342 | if (ret) | |
1343 | goto out; | |
1344 | ||
f9db92cb AS |
1345 | if (host->sdio_irq >= 0) { |
1346 | ret = request_irq(host->sdio_irq, mmc_davinci_sdio_irq, 0, | |
1347 | mmc_hostname(mmc), host); | |
1348 | if (!ret) | |
1349 | mmc->caps |= MMC_CAP_SDIO_IRQ; | |
1350 | } | |
1351 | ||
b4cff454 VB |
1352 | rename_region(mem, mmc_hostname(mmc)); |
1353 | ||
1354 | dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n", | |
1355 | host->use_dma ? "DMA" : "PIO", | |
1356 | (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1); | |
1357 | ||
1358 | return 0; | |
1359 | ||
1360 | out: | |
7e30b8de C |
1361 | mmc_davinci_cpufreq_deregister(host); |
1362 | cpu_freq_fail: | |
b4cff454 VB |
1363 | if (host) { |
1364 | davinci_release_dma_channels(host); | |
1365 | ||
1366 | if (host->clk) { | |
1367 | clk_disable(host->clk); | |
1368 | clk_put(host->clk); | |
1369 | } | |
1370 | ||
1371 | if (host->base) | |
1372 | iounmap(host->base); | |
1373 | } | |
1374 | ||
1375 | if (mmc) | |
1376 | mmc_free_host(mmc); | |
1377 | ||
1378 | if (mem) | |
1379 | release_resource(mem); | |
1380 | ||
1381 | dev_dbg(&pdev->dev, "probe err %d\n", ret); | |
1382 | ||
1383 | return ret; | |
1384 | } | |
1385 | ||
1386 | static int __exit davinci_mmcsd_remove(struct platform_device *pdev) | |
1387 | { | |
1388 | struct mmc_davinci_host *host = platform_get_drvdata(pdev); | |
1389 | ||
1390 | platform_set_drvdata(pdev, NULL); | |
1391 | if (host) { | |
7e30b8de C |
1392 | mmc_davinci_cpufreq_deregister(host); |
1393 | ||
b4cff454 | 1394 | mmc_remove_host(host->mmc); |
f9db92cb AS |
1395 | free_irq(host->mmc_irq, host); |
1396 | if (host->mmc->caps & MMC_CAP_SDIO_IRQ) | |
1397 | free_irq(host->sdio_irq, host); | |
b4cff454 VB |
1398 | |
1399 | davinci_release_dma_channels(host); | |
1400 | ||
1401 | clk_disable(host->clk); | |
1402 | clk_put(host->clk); | |
1403 | ||
1404 | iounmap(host->base); | |
1405 | ||
1406 | release_resource(host->mem_res); | |
1407 | ||
1408 | mmc_free_host(host->mmc); | |
1409 | } | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | ||
1414 | #ifdef CONFIG_PM | |
bbce5802 | 1415 | static int davinci_mmcsd_suspend(struct device *dev) |
b4cff454 | 1416 | { |
bbce5802 | 1417 | struct platform_device *pdev = to_platform_device(dev); |
b4cff454 | 1418 | struct mmc_davinci_host *host = platform_get_drvdata(pdev); |
bbce5802 | 1419 | int ret; |
b4cff454 | 1420 | |
bbce5802 | 1421 | mmc_host_enable(host->mmc); |
1a13f8fa | 1422 | ret = mmc_suspend_host(host->mmc); |
bbce5802 C |
1423 | if (!ret) { |
1424 | writel(0, host->base + DAVINCI_MMCIM); | |
1425 | mmc_davinci_reset_ctrl(host, 1); | |
1426 | mmc_host_disable(host->mmc); | |
1427 | clk_disable(host->clk); | |
1428 | host->suspended = 1; | |
1429 | } else { | |
1430 | host->suspended = 0; | |
1431 | mmc_host_disable(host->mmc); | |
1432 | } | |
1433 | ||
1434 | return ret; | |
b4cff454 VB |
1435 | } |
1436 | ||
bbce5802 | 1437 | static int davinci_mmcsd_resume(struct device *dev) |
b4cff454 | 1438 | { |
bbce5802 | 1439 | struct platform_device *pdev = to_platform_device(dev); |
b4cff454 | 1440 | struct mmc_davinci_host *host = platform_get_drvdata(pdev); |
bbce5802 | 1441 | int ret; |
b4cff454 | 1442 | |
bbce5802 C |
1443 | if (!host->suspended) |
1444 | return 0; | |
1445 | ||
1446 | clk_enable(host->clk); | |
1447 | mmc_host_enable(host->mmc); | |
1448 | ||
1449 | mmc_davinci_reset_ctrl(host, 0); | |
1450 | ret = mmc_resume_host(host->mmc); | |
1451 | if (!ret) | |
1452 | host->suspended = 0; | |
1453 | ||
1454 | return ret; | |
b4cff454 | 1455 | } |
bbce5802 C |
1456 | |
1457 | static const struct dev_pm_ops davinci_mmcsd_pm = { | |
1458 | .suspend = davinci_mmcsd_suspend, | |
1459 | .resume = davinci_mmcsd_resume, | |
1460 | }; | |
1461 | ||
1462 | #define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm) | |
b4cff454 | 1463 | #else |
bbce5802 | 1464 | #define davinci_mmcsd_pm_ops NULL |
b4cff454 VB |
1465 | #endif |
1466 | ||
1467 | static struct platform_driver davinci_mmcsd_driver = { | |
1468 | .driver = { | |
1469 | .name = "davinci_mmc", | |
1470 | .owner = THIS_MODULE, | |
bbce5802 | 1471 | .pm = davinci_mmcsd_pm_ops, |
b4cff454 VB |
1472 | }, |
1473 | .remove = __exit_p(davinci_mmcsd_remove), | |
b4cff454 VB |
1474 | }; |
1475 | ||
1476 | static int __init davinci_mmcsd_init(void) | |
1477 | { | |
1478 | return platform_driver_probe(&davinci_mmcsd_driver, | |
1479 | davinci_mmcsd_probe); | |
1480 | } | |
1481 | module_init(davinci_mmcsd_init); | |
1482 | ||
1483 | static void __exit davinci_mmcsd_exit(void) | |
1484 | { | |
1485 | platform_driver_unregister(&davinci_mmcsd_driver); | |
1486 | } | |
1487 | module_exit(davinci_mmcsd_exit); | |
1488 | ||
1489 | MODULE_AUTHOR("Texas Instruments India"); | |
1490 | MODULE_LICENSE("GPL"); | |
1491 | MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller"); | |
1492 |