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