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Merge branch 'parisc-4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[deliverable/linux.git] / drivers / mmc / host / davinci_mmc.c
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>
28 #include <linux/cpufreq.h>
29 #include <linux/mmc/host.h>
30 #include <linux/io.h>
31 #include <linux/irq.h>
32 #include <linux/delay.h>
33 #include <linux/dmaengine.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/edma.h>
36 #include <linux/mmc/mmc.h>
37 #include <linux/of.h>
38 #include <linux/of_device.h>
39
40 #include <linux/platform_data/edma.h>
41 #include <linux/platform_data/mmc-davinci.h>
42
43 /*
44 * Register Definitions
45 */
46 #define DAVINCI_MMCCTL 0x00 /* Control Register */
47 #define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register */
48 #define DAVINCI_MMCST0 0x08 /* Status Register 0 */
49 #define DAVINCI_MMCST1 0x0C /* Status Register 1 */
50 #define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register */
51 #define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register */
52 #define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register */
53 #define DAVINCI_MMCBLEN 0x1C /* Block Length Register */
54 #define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register */
55 #define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register */
56 #define DAVINCI_MMCDRR 0x28 /* Data Receive Register */
57 #define DAVINCI_MMCDXR 0x2C /* Data Transmit Register */
58 #define DAVINCI_MMCCMD 0x30 /* Command Register */
59 #define DAVINCI_MMCARGHL 0x34 /* Argument Register */
60 #define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1 */
61 #define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1 */
62 #define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1 */
63 #define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1 */
64 #define DAVINCI_MMCDRSP 0x48 /* Data Response Register */
65 #define DAVINCI_MMCETOK 0x4C
66 #define DAVINCI_MMCCIDX 0x50 /* Command Index Register */
67 #define DAVINCI_MMCCKC 0x54
68 #define DAVINCI_MMCTORC 0x58
69 #define DAVINCI_MMCTODC 0x5C
70 #define DAVINCI_MMCBLNC 0x60
71 #define DAVINCI_SDIOCTL 0x64
72 #define DAVINCI_SDIOST0 0x68
73 #define DAVINCI_SDIOIEN 0x6C
74 #define DAVINCI_SDIOIST 0x70
75 #define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */
76
77 /* DAVINCI_MMCCTL definitions */
78 #define MMCCTL_DATRST (1 << 0)
79 #define MMCCTL_CMDRST (1 << 1)
80 #define MMCCTL_WIDTH_8_BIT (1 << 8)
81 #define MMCCTL_WIDTH_4_BIT (1 << 2)
82 #define MMCCTL_DATEG_DISABLED (0 << 6)
83 #define MMCCTL_DATEG_RISING (1 << 6)
84 #define MMCCTL_DATEG_FALLING (2 << 6)
85 #define MMCCTL_DATEG_BOTH (3 << 6)
86 #define MMCCTL_PERMDR_LE (0 << 9)
87 #define MMCCTL_PERMDR_BE (1 << 9)
88 #define MMCCTL_PERMDX_LE (0 << 10)
89 #define MMCCTL_PERMDX_BE (1 << 10)
90
91 /* DAVINCI_MMCCLK definitions */
92 #define MMCCLK_CLKEN (1 << 8)
93 #define MMCCLK_CLKRT_MASK (0xFF << 0)
94
95 /* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */
96 #define MMCST0_DATDNE BIT(0) /* data done */
97 #define MMCST0_BSYDNE BIT(1) /* busy done */
98 #define MMCST0_RSPDNE BIT(2) /* command done */
99 #define MMCST0_TOUTRD BIT(3) /* data read timeout */
100 #define MMCST0_TOUTRS BIT(4) /* command response timeout */
101 #define MMCST0_CRCWR BIT(5) /* data write CRC error */
102 #define MMCST0_CRCRD BIT(6) /* data read CRC error */
103 #define MMCST0_CRCRS BIT(7) /* command response CRC error */
104 #define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo empty) */
105 #define MMCST0_DRRDY BIT(10) /* data receive ready (data in fifo)*/
106 #define MMCST0_DATED BIT(11) /* DAT3 edge detect */
107 #define MMCST0_TRNDNE BIT(12) /* transfer done */
108
109 /* DAVINCI_MMCST1 definitions */
110 #define MMCST1_BUSY (1 << 0)
111
112 /* DAVINCI_MMCCMD definitions */
113 #define MMCCMD_CMD_MASK (0x3F << 0)
114 #define MMCCMD_PPLEN (1 << 7)
115 #define MMCCMD_BSYEXP (1 << 8)
116 #define MMCCMD_RSPFMT_MASK (3 << 9)
117 #define MMCCMD_RSPFMT_NONE (0 << 9)
118 #define MMCCMD_RSPFMT_R1456 (1 << 9)
119 #define MMCCMD_RSPFMT_R2 (2 << 9)
120 #define MMCCMD_RSPFMT_R3 (3 << 9)
121 #define MMCCMD_DTRW (1 << 11)
122 #define MMCCMD_STRMTP (1 << 12)
123 #define MMCCMD_WDATX (1 << 13)
124 #define MMCCMD_INITCK (1 << 14)
125 #define MMCCMD_DCLR (1 << 15)
126 #define MMCCMD_DMATRIG (1 << 16)
127
128 /* DAVINCI_MMCFIFOCTL definitions */
129 #define MMCFIFOCTL_FIFORST (1 << 0)
130 #define MMCFIFOCTL_FIFODIR_WR (1 << 1)
131 #define MMCFIFOCTL_FIFODIR_RD (0 << 1)
132 #define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits */
133 #define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes */
134 #define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes */
135 #define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes */
136 #define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte */
137
138 /* DAVINCI_SDIOST0 definitions */
139 #define SDIOST0_DAT1_HI BIT(0)
140
141 /* DAVINCI_SDIOIEN definitions */
142 #define SDIOIEN_IOINTEN BIT(0)
143
144 /* DAVINCI_SDIOIST definitions */
145 #define SDIOIST_IOINT BIT(0)
146
147 /* MMCSD Init clock in Hz in opendrain mode */
148 #define MMCSD_INIT_CLOCK 200000
149
150 /*
151 * One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units,
152 * and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
153 * for drivers with max_segs == 1, making the segments bigger (64KB)
154 * than the page or two that's otherwise typical. nr_sg (passed from
155 * platform data) == 16 gives at least the same throughput boost, using
156 * EDMA transfer linkage instead of spending CPU time copying pages.
157 */
158 #define MAX_CCNT ((1 << 16) - 1)
159
160 #define MAX_NR_SG 16
161
162 static unsigned rw_threshold = 32;
163 module_param(rw_threshold, uint, S_IRUGO);
164 MODULE_PARM_DESC(rw_threshold,
165 "Read/Write threshold. Default = 32");
166
167 static unsigned poll_threshold = 128;
168 module_param(poll_threshold, uint, S_IRUGO);
169 MODULE_PARM_DESC(poll_threshold,
170 "Polling transaction size threshold. Default = 128");
171
172 static unsigned poll_loopcount = 32;
173 module_param(poll_loopcount, uint, S_IRUGO);
174 MODULE_PARM_DESC(poll_loopcount,
175 "Maximum polling loop count. Default = 32");
176
177 static unsigned __initdata use_dma = 1;
178 module_param(use_dma, uint, 0);
179 MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
180
181 struct mmc_davinci_host {
182 struct mmc_command *cmd;
183 struct mmc_data *data;
184 struct mmc_host *mmc;
185 struct clk *clk;
186 unsigned int mmc_input_clk;
187 void __iomem *base;
188 struct resource *mem_res;
189 int mmc_irq, sdio_irq;
190 unsigned char bus_mode;
191
192 #define DAVINCI_MMC_DATADIR_NONE 0
193 #define DAVINCI_MMC_DATADIR_READ 1
194 #define DAVINCI_MMC_DATADIR_WRITE 2
195 unsigned char data_dir;
196
197 /* buffer is used during PIO of one scatterlist segment, and
198 * is updated along with buffer_bytes_left. bytes_left applies
199 * to all N blocks of the PIO transfer.
200 */
201 u8 *buffer;
202 u32 buffer_bytes_left;
203 u32 bytes_left;
204
205 u32 rxdma, txdma;
206 struct dma_chan *dma_tx;
207 struct dma_chan *dma_rx;
208 bool use_dma;
209 bool do_dma;
210 bool sdio_int;
211 bool active_request;
212
213 /* For PIO we walk scatterlists one segment at a time. */
214 unsigned int sg_len;
215 struct scatterlist *sg;
216
217 /* Version of the MMC/SD controller */
218 u8 version;
219 /* for ns in one cycle calculation */
220 unsigned ns_in_one_cycle;
221 /* Number of sg segments */
222 u8 nr_sg;
223 #ifdef CONFIG_CPU_FREQ
224 struct notifier_block freq_transition;
225 #endif
226 };
227
228 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
229
230 /* PIO only */
231 static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
232 {
233 host->buffer_bytes_left = sg_dma_len(host->sg);
234 host->buffer = sg_virt(host->sg);
235 if (host->buffer_bytes_left > host->bytes_left)
236 host->buffer_bytes_left = host->bytes_left;
237 }
238
239 static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
240 unsigned int n)
241 {
242 u8 *p;
243 unsigned int i;
244
245 if (host->buffer_bytes_left == 0) {
246 host->sg = sg_next(host->data->sg);
247 mmc_davinci_sg_to_buf(host);
248 }
249
250 p = host->buffer;
251 if (n > host->buffer_bytes_left)
252 n = host->buffer_bytes_left;
253 host->buffer_bytes_left -= n;
254 host->bytes_left -= n;
255
256 /* NOTE: we never transfer more than rw_threshold bytes
257 * to/from the fifo here; there's no I/O overlap.
258 * This also assumes that access width( i.e. ACCWD) is 4 bytes
259 */
260 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
261 for (i = 0; i < (n >> 2); i++) {
262 writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
263 p = p + 4;
264 }
265 if (n & 3) {
266 iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3));
267 p = p + (n & 3);
268 }
269 } else {
270 for (i = 0; i < (n >> 2); i++) {
271 *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
272 p = p + 4;
273 }
274 if (n & 3) {
275 ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3));
276 p = p + (n & 3);
277 }
278 }
279 host->buffer = p;
280 }
281
282 static void mmc_davinci_start_command(struct mmc_davinci_host *host,
283 struct mmc_command *cmd)
284 {
285 u32 cmd_reg = 0;
286 u32 im_val;
287
288 dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
289 cmd->opcode, cmd->arg,
290 ({ char *s;
291 switch (mmc_resp_type(cmd)) {
292 case MMC_RSP_R1:
293 s = ", R1/R5/R6/R7 response";
294 break;
295 case MMC_RSP_R1B:
296 s = ", R1b response";
297 break;
298 case MMC_RSP_R2:
299 s = ", R2 response";
300 break;
301 case MMC_RSP_R3:
302 s = ", R3/R4 response";
303 break;
304 default:
305 s = ", (R? response)";
306 break;
307 }; s; }));
308 host->cmd = cmd;
309
310 switch (mmc_resp_type(cmd)) {
311 case MMC_RSP_R1B:
312 /* There's some spec confusion about when R1B is
313 * allowed, but if the card doesn't issue a BUSY
314 * then it's harmless for us to allow it.
315 */
316 cmd_reg |= MMCCMD_BSYEXP;
317 /* FALLTHROUGH */
318 case MMC_RSP_R1: /* 48 bits, CRC */
319 cmd_reg |= MMCCMD_RSPFMT_R1456;
320 break;
321 case MMC_RSP_R2: /* 136 bits, CRC */
322 cmd_reg |= MMCCMD_RSPFMT_R2;
323 break;
324 case MMC_RSP_R3: /* 48 bits, no CRC */
325 cmd_reg |= MMCCMD_RSPFMT_R3;
326 break;
327 default:
328 cmd_reg |= MMCCMD_RSPFMT_NONE;
329 dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
330 mmc_resp_type(cmd));
331 break;
332 }
333
334 /* Set command index */
335 cmd_reg |= cmd->opcode;
336
337 /* Enable EDMA transfer triggers */
338 if (host->do_dma)
339 cmd_reg |= MMCCMD_DMATRIG;
340
341 if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
342 host->data_dir == DAVINCI_MMC_DATADIR_READ)
343 cmd_reg |= MMCCMD_DMATRIG;
344
345 /* Setting whether command involves data transfer or not */
346 if (cmd->data)
347 cmd_reg |= MMCCMD_WDATX;
348
349 /* Setting whether stream or block transfer */
350 if (cmd->flags & MMC_DATA_STREAM)
351 cmd_reg |= MMCCMD_STRMTP;
352
353 /* Setting whether data read or write */
354 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
355 cmd_reg |= MMCCMD_DTRW;
356
357 if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
358 cmd_reg |= MMCCMD_PPLEN;
359
360 /* set Command timeout */
361 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
362
363 /* Enable interrupt (calculate here, defer until FIFO is stuffed). */
364 im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
365 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
366 im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
367
368 if (!host->do_dma)
369 im_val |= MMCST0_DXRDY;
370 } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
371 im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
372
373 if (!host->do_dma)
374 im_val |= MMCST0_DRRDY;
375 }
376
377 /*
378 * Before non-DMA WRITE commands the controller needs priming:
379 * FIFO should be populated with 32 bytes i.e. whatever is the FIFO size
380 */
381 if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE))
382 davinci_fifo_data_trans(host, rw_threshold);
383
384 writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
385 writel(cmd_reg, host->base + DAVINCI_MMCCMD);
386
387 host->active_request = true;
388
389 if (!host->do_dma && host->bytes_left <= poll_threshold) {
390 u32 count = poll_loopcount;
391
392 while (host->active_request && count--) {
393 mmc_davinci_irq(0, host);
394 cpu_relax();
395 }
396 }
397
398 if (host->active_request)
399 writel(im_val, host->base + DAVINCI_MMCIM);
400 }
401
402 /*----------------------------------------------------------------------*/
403
404 /* DMA infrastructure */
405
406 static void davinci_abort_dma(struct mmc_davinci_host *host)
407 {
408 struct dma_chan *sync_dev;
409
410 if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
411 sync_dev = host->dma_rx;
412 else
413 sync_dev = host->dma_tx;
414
415 dmaengine_terminate_all(sync_dev);
416 }
417
418 static int mmc_davinci_send_dma_request(struct mmc_davinci_host *host,
419 struct mmc_data *data)
420 {
421 struct dma_chan *chan;
422 struct dma_async_tx_descriptor *desc;
423 int ret = 0;
424
425 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
426 struct dma_slave_config dma_tx_conf = {
427 .direction = DMA_MEM_TO_DEV,
428 .dst_addr = host->mem_res->start + DAVINCI_MMCDXR,
429 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
430 .dst_maxburst =
431 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
432 };
433 chan = host->dma_tx;
434 dmaengine_slave_config(host->dma_tx, &dma_tx_conf);
435
436 desc = dmaengine_prep_slave_sg(host->dma_tx,
437 data->sg,
438 host->sg_len,
439 DMA_MEM_TO_DEV,
440 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
441 if (!desc) {
442 dev_dbg(mmc_dev(host->mmc),
443 "failed to allocate DMA TX descriptor");
444 ret = -1;
445 goto out;
446 }
447 } else {
448 struct dma_slave_config dma_rx_conf = {
449 .direction = DMA_DEV_TO_MEM,
450 .src_addr = host->mem_res->start + DAVINCI_MMCDRR,
451 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
452 .src_maxburst =
453 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
454 };
455 chan = host->dma_rx;
456 dmaengine_slave_config(host->dma_rx, &dma_rx_conf);
457
458 desc = dmaengine_prep_slave_sg(host->dma_rx,
459 data->sg,
460 host->sg_len,
461 DMA_DEV_TO_MEM,
462 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
463 if (!desc) {
464 dev_dbg(mmc_dev(host->mmc),
465 "failed to allocate DMA RX descriptor");
466 ret = -1;
467 goto out;
468 }
469 }
470
471 dmaengine_submit(desc);
472 dma_async_issue_pending(chan);
473
474 out:
475 return ret;
476 }
477
478 static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host,
479 struct mmc_data *data)
480 {
481 int i;
482 int mask = rw_threshold - 1;
483 int ret = 0;
484
485 host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
486 ((data->flags & MMC_DATA_WRITE)
487 ? DMA_TO_DEVICE
488 : DMA_FROM_DEVICE));
489
490 /* no individual DMA segment should need a partial FIFO */
491 for (i = 0; i < host->sg_len; i++) {
492 if (sg_dma_len(data->sg + i) & mask) {
493 dma_unmap_sg(mmc_dev(host->mmc),
494 data->sg, data->sg_len,
495 (data->flags & MMC_DATA_WRITE)
496 ? DMA_TO_DEVICE
497 : DMA_FROM_DEVICE);
498 return -1;
499 }
500 }
501
502 host->do_dma = 1;
503 ret = mmc_davinci_send_dma_request(host, data);
504
505 return ret;
506 }
507
508 static void __init_or_module
509 davinci_release_dma_channels(struct mmc_davinci_host *host)
510 {
511 if (!host->use_dma)
512 return;
513
514 dma_release_channel(host->dma_tx);
515 dma_release_channel(host->dma_rx);
516 }
517
518 static int __init davinci_acquire_dma_channels(struct mmc_davinci_host *host)
519 {
520 int r;
521 dma_cap_mask_t mask;
522
523 dma_cap_zero(mask);
524 dma_cap_set(DMA_SLAVE, mask);
525
526 host->dma_tx =
527 dma_request_slave_channel_compat(mask, edma_filter_fn,
528 &host->txdma, mmc_dev(host->mmc), "tx");
529 if (!host->dma_tx) {
530 dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n");
531 return -ENODEV;
532 }
533
534 host->dma_rx =
535 dma_request_slave_channel_compat(mask, edma_filter_fn,
536 &host->rxdma, mmc_dev(host->mmc), "rx");
537 if (!host->dma_rx) {
538 dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n");
539 r = -ENODEV;
540 goto free_master_write;
541 }
542
543 return 0;
544
545 free_master_write:
546 dma_release_channel(host->dma_tx);
547
548 return r;
549 }
550
551 /*----------------------------------------------------------------------*/
552
553 static void
554 mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req)
555 {
556 int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
557 int timeout;
558 struct mmc_data *data = req->data;
559
560 if (host->version == MMC_CTLR_VERSION_2)
561 fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
562
563 host->data = data;
564 if (data == NULL) {
565 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
566 writel(0, host->base + DAVINCI_MMCBLEN);
567 writel(0, host->base + DAVINCI_MMCNBLK);
568 return;
569 }
570
571 dev_dbg(mmc_dev(host->mmc), "%s %s, %d blocks of %d bytes\n",
572 (data->flags & MMC_DATA_STREAM) ? "stream" : "block",
573 (data->flags & MMC_DATA_WRITE) ? "write" : "read",
574 data->blocks, data->blksz);
575 dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n",
576 data->timeout_clks, data->timeout_ns);
577 timeout = data->timeout_clks +
578 (data->timeout_ns / host->ns_in_one_cycle);
579 if (timeout > 0xffff)
580 timeout = 0xffff;
581
582 writel(timeout, host->base + DAVINCI_MMCTOD);
583 writel(data->blocks, host->base + DAVINCI_MMCNBLK);
584 writel(data->blksz, host->base + DAVINCI_MMCBLEN);
585
586 /* Configure the FIFO */
587 switch (data->flags & MMC_DATA_WRITE) {
588 case MMC_DATA_WRITE:
589 host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
590 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST,
591 host->base + DAVINCI_MMCFIFOCTL);
592 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
593 host->base + DAVINCI_MMCFIFOCTL);
594 break;
595
596 default:
597 host->data_dir = DAVINCI_MMC_DATADIR_READ;
598 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST,
599 host->base + DAVINCI_MMCFIFOCTL);
600 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
601 host->base + DAVINCI_MMCFIFOCTL);
602 break;
603 }
604
605 host->buffer = NULL;
606 host->bytes_left = data->blocks * data->blksz;
607
608 /* For now we try to use DMA whenever we won't need partial FIFO
609 * reads or writes, either for the whole transfer (as tested here)
610 * or for any individual scatterlist segment (tested when we call
611 * start_dma_transfer).
612 *
613 * While we *could* change that, unusual block sizes are rarely
614 * used. The occasional fallback to PIO should't hurt.
615 */
616 if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
617 && mmc_davinci_start_dma_transfer(host, data) == 0) {
618 /* zero this to ensure we take no PIO paths */
619 host->bytes_left = 0;
620 } else {
621 /* Revert to CPU Copy */
622 host->sg_len = data->sg_len;
623 host->sg = host->data->sg;
624 mmc_davinci_sg_to_buf(host);
625 }
626 }
627
628 static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req)
629 {
630 struct mmc_davinci_host *host = mmc_priv(mmc);
631 unsigned long timeout = jiffies + msecs_to_jiffies(900);
632 u32 mmcst1 = 0;
633
634 /* Card may still be sending BUSY after a previous operation,
635 * typically some kind of write. If so, we can't proceed yet.
636 */
637 while (time_before(jiffies, timeout)) {
638 mmcst1 = readl(host->base + DAVINCI_MMCST1);
639 if (!(mmcst1 & MMCST1_BUSY))
640 break;
641 cpu_relax();
642 }
643 if (mmcst1 & MMCST1_BUSY) {
644 dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
645 req->cmd->error = -ETIMEDOUT;
646 mmc_request_done(mmc, req);
647 return;
648 }
649
650 host->do_dma = 0;
651 mmc_davinci_prepare_data(host, req);
652 mmc_davinci_start_command(host, req->cmd);
653 }
654
655 static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host,
656 unsigned int mmc_req_freq)
657 {
658 unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0;
659
660 mmc_pclk = host->mmc_input_clk;
661 if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
662 mmc_push_pull_divisor = ((unsigned int)mmc_pclk
663 / (2 * mmc_req_freq)) - 1;
664 else
665 mmc_push_pull_divisor = 0;
666
667 mmc_freq = (unsigned int)mmc_pclk
668 / (2 * (mmc_push_pull_divisor + 1));
669
670 if (mmc_freq > mmc_req_freq)
671 mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
672 /* Convert ns to clock cycles */
673 if (mmc_req_freq <= 400000)
674 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
675 / (2 * (mmc_push_pull_divisor + 1)))/1000));
676 else
677 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
678 / (2 * (mmc_push_pull_divisor + 1)))/1000000));
679
680 return mmc_push_pull_divisor;
681 }
682
683 static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
684 {
685 unsigned int open_drain_freq = 0, mmc_pclk = 0;
686 unsigned int mmc_push_pull_freq = 0;
687 struct mmc_davinci_host *host = mmc_priv(mmc);
688
689 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
690 u32 temp;
691
692 /* Ignoring the init clock value passed for fixing the inter
693 * operability with different cards.
694 */
695 open_drain_freq = ((unsigned int)mmc_pclk
696 / (2 * MMCSD_INIT_CLOCK)) - 1;
697
698 if (open_drain_freq > 0xFF)
699 open_drain_freq = 0xFF;
700
701 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
702 temp |= open_drain_freq;
703 writel(temp, host->base + DAVINCI_MMCCLK);
704
705 /* Convert ns to clock cycles */
706 host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000);
707 } else {
708 u32 temp;
709 mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock);
710
711 if (mmc_push_pull_freq > 0xFF)
712 mmc_push_pull_freq = 0xFF;
713
714 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
715 writel(temp, host->base + DAVINCI_MMCCLK);
716
717 udelay(10);
718
719 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
720 temp |= mmc_push_pull_freq;
721 writel(temp, host->base + DAVINCI_MMCCLK);
722
723 writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
724
725 udelay(10);
726 }
727 }
728
729 static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
730 {
731 struct mmc_davinci_host *host = mmc_priv(mmc);
732 struct platform_device *pdev = to_platform_device(mmc->parent);
733 struct davinci_mmc_config *config = pdev->dev.platform_data;
734
735 dev_dbg(mmc_dev(host->mmc),
736 "clock %dHz busmode %d powermode %d Vdd %04x\n",
737 ios->clock, ios->bus_mode, ios->power_mode,
738 ios->vdd);
739
740 switch (ios->power_mode) {
741 case MMC_POWER_OFF:
742 if (config && config->set_power)
743 config->set_power(pdev->id, false);
744 break;
745 case MMC_POWER_UP:
746 if (config && config->set_power)
747 config->set_power(pdev->id, true);
748 break;
749 }
750
751 switch (ios->bus_width) {
752 case MMC_BUS_WIDTH_8:
753 dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");
754 writel((readl(host->base + DAVINCI_MMCCTL) &
755 ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT,
756 host->base + DAVINCI_MMCCTL);
757 break;
758 case MMC_BUS_WIDTH_4:
759 dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
760 if (host->version == MMC_CTLR_VERSION_2)
761 writel((readl(host->base + DAVINCI_MMCCTL) &
762 ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT,
763 host->base + DAVINCI_MMCCTL);
764 else
765 writel(readl(host->base + DAVINCI_MMCCTL) |
766 MMCCTL_WIDTH_4_BIT,
767 host->base + DAVINCI_MMCCTL);
768 break;
769 case MMC_BUS_WIDTH_1:
770 dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n");
771 if (host->version == MMC_CTLR_VERSION_2)
772 writel(readl(host->base + DAVINCI_MMCCTL) &
773 ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT),
774 host->base + DAVINCI_MMCCTL);
775 else
776 writel(readl(host->base + DAVINCI_MMCCTL) &
777 ~MMCCTL_WIDTH_4_BIT,
778 host->base + DAVINCI_MMCCTL);
779 break;
780 }
781
782 calculate_clk_divider(mmc, ios);
783
784 host->bus_mode = ios->bus_mode;
785 if (ios->power_mode == MMC_POWER_UP) {
786 unsigned long timeout = jiffies + msecs_to_jiffies(50);
787 bool lose = true;
788
789 /* Send clock cycles, poll completion */
790 writel(0, host->base + DAVINCI_MMCARGHL);
791 writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
792 while (time_before(jiffies, timeout)) {
793 u32 tmp = readl(host->base + DAVINCI_MMCST0);
794
795 if (tmp & MMCST0_RSPDNE) {
796 lose = false;
797 break;
798 }
799 cpu_relax();
800 }
801 if (lose)
802 dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
803 }
804
805 /* FIXME on power OFF, reset things ... */
806 }
807
808 static void
809 mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
810 {
811 host->data = NULL;
812
813 if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
814 /*
815 * SDIO Interrupt Detection work-around as suggested by
816 * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
817 * 2.1.6): Signal SDIO interrupt only if it is enabled by core
818 */
819 if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) &
820 SDIOST0_DAT1_HI)) {
821 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
822 mmc_signal_sdio_irq(host->mmc);
823 }
824 }
825
826 if (host->do_dma) {
827 davinci_abort_dma(host);
828
829 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
830 (data->flags & MMC_DATA_WRITE)
831 ? DMA_TO_DEVICE
832 : DMA_FROM_DEVICE);
833 host->do_dma = false;
834 }
835 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
836
837 if (!data->stop || (host->cmd && host->cmd->error)) {
838 mmc_request_done(host->mmc, data->mrq);
839 writel(0, host->base + DAVINCI_MMCIM);
840 host->active_request = false;
841 } else
842 mmc_davinci_start_command(host, data->stop);
843 }
844
845 static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
846 struct mmc_command *cmd)
847 {
848 host->cmd = NULL;
849
850 if (cmd->flags & MMC_RSP_PRESENT) {
851 if (cmd->flags & MMC_RSP_136) {
852 /* response type 2 */
853 cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
854 cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
855 cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
856 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
857 } else {
858 /* response types 1, 1b, 3, 4, 5, 6 */
859 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
860 }
861 }
862
863 if (host->data == NULL || cmd->error) {
864 if (cmd->error == -ETIMEDOUT)
865 cmd->mrq->cmd->retries = 0;
866 mmc_request_done(host->mmc, cmd->mrq);
867 writel(0, host->base + DAVINCI_MMCIM);
868 host->active_request = false;
869 }
870 }
871
872 static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
873 int val)
874 {
875 u32 temp;
876
877 temp = readl(host->base + DAVINCI_MMCCTL);
878 if (val) /* reset */
879 temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
880 else /* enable */
881 temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
882
883 writel(temp, host->base + DAVINCI_MMCCTL);
884 udelay(10);
885 }
886
887 static void
888 davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
889 {
890 mmc_davinci_reset_ctrl(host, 1);
891 mmc_davinci_reset_ctrl(host, 0);
892 }
893
894 static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
895 {
896 struct mmc_davinci_host *host = dev_id;
897 unsigned int status;
898
899 status = readl(host->base + DAVINCI_SDIOIST);
900 if (status & SDIOIST_IOINT) {
901 dev_dbg(mmc_dev(host->mmc),
902 "SDIO interrupt status %x\n", status);
903 writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
904 mmc_signal_sdio_irq(host->mmc);
905 }
906 return IRQ_HANDLED;
907 }
908
909 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
910 {
911 struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
912 unsigned int status, qstatus;
913 int end_command = 0;
914 int end_transfer = 0;
915 struct mmc_data *data = host->data;
916
917 if (host->cmd == NULL && host->data == NULL) {
918 status = readl(host->base + DAVINCI_MMCST0);
919 dev_dbg(mmc_dev(host->mmc),
920 "Spurious interrupt 0x%04x\n", status);
921 /* Disable the interrupt from mmcsd */
922 writel(0, host->base + DAVINCI_MMCIM);
923 return IRQ_NONE;
924 }
925
926 status = readl(host->base + DAVINCI_MMCST0);
927 qstatus = status;
928
929 /* handle FIFO first when using PIO for data.
930 * bytes_left will decrease to zero as I/O progress and status will
931 * read zero over iteration because this controller status
932 * register(MMCST0) reports any status only once and it is cleared
933 * by read. So, it is not unbouned loop even in the case of
934 * non-dma.
935 */
936 if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
937 unsigned long im_val;
938
939 /*
940 * If interrupts fire during the following loop, they will be
941 * handled by the handler, but the PIC will still buffer these.
942 * As a result, the handler will be called again to serve these
943 * needlessly. In order to avoid these spurious interrupts,
944 * keep interrupts masked during the loop.
945 */
946 im_val = readl(host->base + DAVINCI_MMCIM);
947 writel(0, host->base + DAVINCI_MMCIM);
948
949 do {
950 davinci_fifo_data_trans(host, rw_threshold);
951 status = readl(host->base + DAVINCI_MMCST0);
952 qstatus |= status;
953 } while (host->bytes_left &&
954 (status & (MMCST0_DXRDY | MMCST0_DRRDY)));
955
956 /*
957 * If an interrupt is pending, it is assumed it will fire when
958 * it is unmasked. This assumption is also taken when the MMCIM
959 * is first set. Otherwise, writing to MMCIM after reading the
960 * status is race-prone.
961 */
962 writel(im_val, host->base + DAVINCI_MMCIM);
963 }
964
965 if (qstatus & MMCST0_DATDNE) {
966 /* All blocks sent/received, and CRC checks passed */
967 if (data != NULL) {
968 if ((host->do_dma == 0) && (host->bytes_left > 0)) {
969 /* if datasize < rw_threshold
970 * no RX ints are generated
971 */
972 davinci_fifo_data_trans(host, host->bytes_left);
973 }
974 end_transfer = 1;
975 data->bytes_xfered = data->blocks * data->blksz;
976 } else {
977 dev_err(mmc_dev(host->mmc),
978 "DATDNE with no host->data\n");
979 }
980 }
981
982 if (qstatus & MMCST0_TOUTRD) {
983 /* Read data timeout */
984 data->error = -ETIMEDOUT;
985 end_transfer = 1;
986
987 dev_dbg(mmc_dev(host->mmc),
988 "read data timeout, status %x\n",
989 qstatus);
990
991 davinci_abort_data(host, data);
992 }
993
994 if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
995 /* Data CRC error */
996 data->error = -EILSEQ;
997 end_transfer = 1;
998
999 /* NOTE: this controller uses CRCWR to report both CRC
1000 * errors and timeouts (on writes). MMCDRSP values are
1001 * only weakly documented, but 0x9f was clearly a timeout
1002 * case and the two three-bit patterns in various SD specs
1003 * (101, 010) aren't part of it ...
1004 */
1005 if (qstatus & MMCST0_CRCWR) {
1006 u32 temp = readb(host->base + DAVINCI_MMCDRSP);
1007
1008 if (temp == 0x9f)
1009 data->error = -ETIMEDOUT;
1010 }
1011 dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
1012 (qstatus & MMCST0_CRCWR) ? "write" : "read",
1013 (data->error == -ETIMEDOUT) ? "timeout" : "CRC");
1014
1015 davinci_abort_data(host, data);
1016 }
1017
1018 if (qstatus & MMCST0_TOUTRS) {
1019 /* Command timeout */
1020 if (host->cmd) {
1021 dev_dbg(mmc_dev(host->mmc),
1022 "CMD%d timeout, status %x\n",
1023 host->cmd->opcode, qstatus);
1024 host->cmd->error = -ETIMEDOUT;
1025 if (data) {
1026 end_transfer = 1;
1027 davinci_abort_data(host, data);
1028 } else
1029 end_command = 1;
1030 }
1031 }
1032
1033 if (qstatus & MMCST0_CRCRS) {
1034 /* Command CRC error */
1035 dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
1036 if (host->cmd) {
1037 host->cmd->error = -EILSEQ;
1038 end_command = 1;
1039 }
1040 }
1041
1042 if (qstatus & MMCST0_RSPDNE) {
1043 /* End of command phase */
1044 end_command = (int) host->cmd;
1045 }
1046
1047 if (end_command)
1048 mmc_davinci_cmd_done(host, host->cmd);
1049 if (end_transfer)
1050 mmc_davinci_xfer_done(host, data);
1051 return IRQ_HANDLED;
1052 }
1053
1054 static int mmc_davinci_get_cd(struct mmc_host *mmc)
1055 {
1056 struct platform_device *pdev = to_platform_device(mmc->parent);
1057 struct davinci_mmc_config *config = pdev->dev.platform_data;
1058
1059 if (!config || !config->get_cd)
1060 return -ENOSYS;
1061 return config->get_cd(pdev->id);
1062 }
1063
1064 static int mmc_davinci_get_ro(struct mmc_host *mmc)
1065 {
1066 struct platform_device *pdev = to_platform_device(mmc->parent);
1067 struct davinci_mmc_config *config = pdev->dev.platform_data;
1068
1069 if (!config || !config->get_ro)
1070 return -ENOSYS;
1071 return config->get_ro(pdev->id);
1072 }
1073
1074 static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1075 {
1076 struct mmc_davinci_host *host = mmc_priv(mmc);
1077
1078 if (enable) {
1079 if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) {
1080 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
1081 mmc_signal_sdio_irq(host->mmc);
1082 } else {
1083 host->sdio_int = true;
1084 writel(readl(host->base + DAVINCI_SDIOIEN) |
1085 SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
1086 }
1087 } else {
1088 host->sdio_int = false;
1089 writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
1090 host->base + DAVINCI_SDIOIEN);
1091 }
1092 }
1093
1094 static struct mmc_host_ops mmc_davinci_ops = {
1095 .request = mmc_davinci_request,
1096 .set_ios = mmc_davinci_set_ios,
1097 .get_cd = mmc_davinci_get_cd,
1098 .get_ro = mmc_davinci_get_ro,
1099 .enable_sdio_irq = mmc_davinci_enable_sdio_irq,
1100 };
1101
1102 /*----------------------------------------------------------------------*/
1103
1104 #ifdef CONFIG_CPU_FREQ
1105 static int mmc_davinci_cpufreq_transition(struct notifier_block *nb,
1106 unsigned long val, void *data)
1107 {
1108 struct mmc_davinci_host *host;
1109 unsigned int mmc_pclk;
1110 struct mmc_host *mmc;
1111 unsigned long flags;
1112
1113 host = container_of(nb, struct mmc_davinci_host, freq_transition);
1114 mmc = host->mmc;
1115 mmc_pclk = clk_get_rate(host->clk);
1116
1117 if (val == CPUFREQ_POSTCHANGE) {
1118 spin_lock_irqsave(&mmc->lock, flags);
1119 host->mmc_input_clk = mmc_pclk;
1120 calculate_clk_divider(mmc, &mmc->ios);
1121 spin_unlock_irqrestore(&mmc->lock, flags);
1122 }
1123
1124 return 0;
1125 }
1126
1127 static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1128 {
1129 host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition;
1130
1131 return cpufreq_register_notifier(&host->freq_transition,
1132 CPUFREQ_TRANSITION_NOTIFIER);
1133 }
1134
1135 static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1136 {
1137 cpufreq_unregister_notifier(&host->freq_transition,
1138 CPUFREQ_TRANSITION_NOTIFIER);
1139 }
1140 #else
1141 static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1142 {
1143 return 0;
1144 }
1145
1146 static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1147 {
1148 }
1149 #endif
1150 static void __init init_mmcsd_host(struct mmc_davinci_host *host)
1151 {
1152
1153 mmc_davinci_reset_ctrl(host, 1);
1154
1155 writel(0, host->base + DAVINCI_MMCCLK);
1156 writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
1157
1158 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
1159 writel(0xFFFF, host->base + DAVINCI_MMCTOD);
1160
1161 mmc_davinci_reset_ctrl(host, 0);
1162 }
1163
1164 static const struct platform_device_id davinci_mmc_devtype[] = {
1165 {
1166 .name = "dm6441-mmc",
1167 .driver_data = MMC_CTLR_VERSION_1,
1168 }, {
1169 .name = "da830-mmc",
1170 .driver_data = MMC_CTLR_VERSION_2,
1171 },
1172 {},
1173 };
1174 MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype);
1175
1176 static const struct of_device_id davinci_mmc_dt_ids[] = {
1177 {
1178 .compatible = "ti,dm6441-mmc",
1179 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1],
1180 },
1181 {
1182 .compatible = "ti,da830-mmc",
1183 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2],
1184 },
1185 {},
1186 };
1187 MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
1188
1189 static struct davinci_mmc_config
1190 *mmc_parse_pdata(struct platform_device *pdev)
1191 {
1192 struct device_node *np;
1193 struct davinci_mmc_config *pdata = pdev->dev.platform_data;
1194 const struct of_device_id *match =
1195 of_match_device(davinci_mmc_dt_ids, &pdev->dev);
1196 u32 data;
1197
1198 np = pdev->dev.of_node;
1199 if (!np)
1200 return pdata;
1201
1202 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1203 if (!pdata) {
1204 dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
1205 goto nodata;
1206 }
1207
1208 if (match)
1209 pdev->id_entry = match->data;
1210
1211 if (of_property_read_u32(np, "max-frequency", &pdata->max_freq))
1212 dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n");
1213
1214 of_property_read_u32(np, "bus-width", &data);
1215 switch (data) {
1216 case 1:
1217 case 4:
1218 case 8:
1219 pdata->wires = data;
1220 break;
1221 default:
1222 pdata->wires = 1;
1223 dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n");
1224 }
1225 nodata:
1226 return pdata;
1227 }
1228
1229 static int __init davinci_mmcsd_probe(struct platform_device *pdev)
1230 {
1231 struct davinci_mmc_config *pdata = NULL;
1232 struct mmc_davinci_host *host = NULL;
1233 struct mmc_host *mmc = NULL;
1234 struct resource *r, *mem = NULL;
1235 int ret = 0, irq = 0;
1236 size_t mem_size;
1237 const struct platform_device_id *id_entry;
1238
1239 pdata = mmc_parse_pdata(pdev);
1240 if (pdata == NULL) {
1241 dev_err(&pdev->dev, "Couldn't get platform data\n");
1242 return -ENOENT;
1243 }
1244
1245 ret = -ENODEV;
1246 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1247 irq = platform_get_irq(pdev, 0);
1248 if (!r || irq == NO_IRQ)
1249 goto out;
1250
1251 ret = -EBUSY;
1252 mem_size = resource_size(r);
1253 mem = request_mem_region(r->start, mem_size, pdev->name);
1254 if (!mem)
1255 goto out;
1256
1257 ret = -ENOMEM;
1258 mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
1259 if (!mmc)
1260 goto out;
1261
1262 host = mmc_priv(mmc);
1263 host->mmc = mmc; /* Important */
1264
1265 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1266 if (!r)
1267 dev_warn(&pdev->dev, "RX DMA resource not specified\n");
1268 else
1269 host->rxdma = r->start;
1270
1271 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1272 if (!r)
1273 dev_warn(&pdev->dev, "TX DMA resource not specified\n");
1274 else
1275 host->txdma = r->start;
1276
1277 host->mem_res = mem;
1278 host->base = ioremap(mem->start, mem_size);
1279 if (!host->base)
1280 goto out;
1281
1282 ret = -ENXIO;
1283 host->clk = clk_get(&pdev->dev, "MMCSDCLK");
1284 if (IS_ERR(host->clk)) {
1285 ret = PTR_ERR(host->clk);
1286 goto out;
1287 }
1288 clk_enable(host->clk);
1289 host->mmc_input_clk = clk_get_rate(host->clk);
1290
1291 init_mmcsd_host(host);
1292
1293 if (pdata->nr_sg)
1294 host->nr_sg = pdata->nr_sg - 1;
1295
1296 if (host->nr_sg > MAX_NR_SG || !host->nr_sg)
1297 host->nr_sg = MAX_NR_SG;
1298
1299 host->use_dma = use_dma;
1300 host->mmc_irq = irq;
1301 host->sdio_irq = platform_get_irq(pdev, 1);
1302
1303 if (host->use_dma && davinci_acquire_dma_channels(host) != 0)
1304 host->use_dma = 0;
1305
1306 /* REVISIT: someday, support IRQ-driven card detection. */
1307 mmc->caps |= MMC_CAP_NEEDS_POLL;
1308 mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
1309
1310 if (pdata && (pdata->wires == 4 || pdata->wires == 0))
1311 mmc->caps |= MMC_CAP_4_BIT_DATA;
1312
1313 if (pdata && (pdata->wires == 8))
1314 mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
1315
1316 id_entry = platform_get_device_id(pdev);
1317 if (id_entry)
1318 host->version = id_entry->driver_data;
1319
1320 mmc->ops = &mmc_davinci_ops;
1321 mmc->f_min = 312500;
1322 mmc->f_max = 25000000;
1323 if (pdata && pdata->max_freq)
1324 mmc->f_max = pdata->max_freq;
1325 if (pdata && pdata->caps)
1326 mmc->caps |= pdata->caps;
1327 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1328
1329 /* With no iommu coalescing pages, each phys_seg is a hw_seg.
1330 * Each hw_seg uses one EDMA parameter RAM slot, always one
1331 * channel and then usually some linked slots.
1332 */
1333 mmc->max_segs = MAX_NR_SG;
1334
1335 /* EDMA limit per hw segment (one or two MBytes) */
1336 mmc->max_seg_size = MAX_CCNT * rw_threshold;
1337
1338 /* MMC/SD controller limits for multiblock requests */
1339 mmc->max_blk_size = 4095; /* BLEN is 12 bits */
1340 mmc->max_blk_count = 65535; /* NBLK is 16 bits */
1341 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1342
1343 dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
1344 dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size);
1345 dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size);
1346 dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size);
1347
1348 platform_set_drvdata(pdev, host);
1349
1350 ret = mmc_davinci_cpufreq_register(host);
1351 if (ret) {
1352 dev_err(&pdev->dev, "failed to register cpufreq\n");
1353 goto cpu_freq_fail;
1354 }
1355
1356 ret = mmc_add_host(mmc);
1357 if (ret < 0)
1358 goto out;
1359
1360 ret = request_irq(irq, mmc_davinci_irq, 0, mmc_hostname(mmc), host);
1361 if (ret)
1362 goto out;
1363
1364 if (host->sdio_irq >= 0) {
1365 ret = request_irq(host->sdio_irq, mmc_davinci_sdio_irq, 0,
1366 mmc_hostname(mmc), host);
1367 if (!ret)
1368 mmc->caps |= MMC_CAP_SDIO_IRQ;
1369 }
1370
1371 rename_region(mem, mmc_hostname(mmc));
1372
1373 dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
1374 host->use_dma ? "DMA" : "PIO",
1375 (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
1376
1377 return 0;
1378
1379 out:
1380 mmc_davinci_cpufreq_deregister(host);
1381 cpu_freq_fail:
1382 if (host) {
1383 davinci_release_dma_channels(host);
1384
1385 if (host->clk) {
1386 clk_disable(host->clk);
1387 clk_put(host->clk);
1388 }
1389
1390 if (host->base)
1391 iounmap(host->base);
1392 }
1393
1394 if (mmc)
1395 mmc_free_host(mmc);
1396
1397 if (mem)
1398 release_resource(mem);
1399
1400 dev_dbg(&pdev->dev, "probe err %d\n", ret);
1401
1402 return ret;
1403 }
1404
1405 static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
1406 {
1407 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1408
1409 if (host) {
1410 mmc_davinci_cpufreq_deregister(host);
1411
1412 mmc_remove_host(host->mmc);
1413 free_irq(host->mmc_irq, host);
1414 if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
1415 free_irq(host->sdio_irq, host);
1416
1417 davinci_release_dma_channels(host);
1418
1419 clk_disable(host->clk);
1420 clk_put(host->clk);
1421
1422 iounmap(host->base);
1423
1424 release_resource(host->mem_res);
1425
1426 mmc_free_host(host->mmc);
1427 }
1428
1429 return 0;
1430 }
1431
1432 #ifdef CONFIG_PM
1433 static int davinci_mmcsd_suspend(struct device *dev)
1434 {
1435 struct platform_device *pdev = to_platform_device(dev);
1436 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1437
1438 writel(0, host->base + DAVINCI_MMCIM);
1439 mmc_davinci_reset_ctrl(host, 1);
1440 clk_disable(host->clk);
1441
1442 return 0;
1443 }
1444
1445 static int davinci_mmcsd_resume(struct device *dev)
1446 {
1447 struct platform_device *pdev = to_platform_device(dev);
1448 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1449
1450 clk_enable(host->clk);
1451 mmc_davinci_reset_ctrl(host, 0);
1452
1453 return 0;
1454 }
1455
1456 static const struct dev_pm_ops davinci_mmcsd_pm = {
1457 .suspend = davinci_mmcsd_suspend,
1458 .resume = davinci_mmcsd_resume,
1459 };
1460
1461 #define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
1462 #else
1463 #define davinci_mmcsd_pm_ops NULL
1464 #endif
1465
1466 static struct platform_driver davinci_mmcsd_driver = {
1467 .driver = {
1468 .name = "davinci_mmc",
1469 .pm = davinci_mmcsd_pm_ops,
1470 .of_match_table = davinci_mmc_dt_ids,
1471 },
1472 .remove = __exit_p(davinci_mmcsd_remove),
1473 .id_table = davinci_mmc_devtype,
1474 };
1475
1476 module_platform_driver_probe(davinci_mmcsd_driver, davinci_mmcsd_probe);
1477
1478 MODULE_AUTHOR("Texas Instruments India");
1479 MODULE_LICENSE("GPL");
1480 MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
1481 MODULE_ALIAS("platform:davinci_mmc");
1482
Linux kernel - Deliverables
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