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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mmc / host / davinci_mmc.c
blob64a8325a4a8af8f590204e1f38441128eab7e9bd
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/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
69 #define DAVINCI_SDIOIEN 0x6C
70 #define DAVINCI_SDIOIST 0x70
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)
76 #define MMCCTL_WIDTH_8_BIT (1 << 8)
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
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)
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,
148 * and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
149 * for drivers with max_segs == 1, making the segments bigger (64KB)
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.
153 */
154 #define MAX_CCNT ((1 << 16) - 1)
155
156 #define MAX_NR_SG 16
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;
175 int mmc_irq, sdio_irq;
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;
182 unsigned char suspended;
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
192 u32 rxdma, txdma;
193 bool use_dma;
194 bool do_dma;
195 bool sdio_int;
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;
205 u32 links[MAX_NR_SG - 1];
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;
215 /* Number of sg segments */
216 u8 nr_sg;
217 #ifdef CONFIG_CPU_FREQ
218 struct notifier_block freq_transition;
219 #endif
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;
492 const unsigned shift = ffs(rw_threshold) - 1;
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 {
583 u32 link_size;
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 */
609 link_size = min_t(unsigned, host->nr_sg, ARRAY_SIZE(host->links));
610 for (i = 0; i < link_size; i++) {
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
761 static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
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
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 }
805 }
806
807 static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
808 {
809 struct mmc_davinci_host *host = mmc_priv(mmc);
810 struct platform_device *pdev = to_platform_device(mmc->parent);
811 struct davinci_mmc_config *config = pdev->dev.platform_data;
812
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);
817
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
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,
834 host->base + DAVINCI_MMCCTL);
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;
858 }
859
860 calculate_clk_divider(mmc, ios);
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
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
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
948 static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
949 int val)
950 {
951 u32 temp;
952
953 temp = readl(host->base + DAVINCI_MMCCTL);
954 if (val) /* reset */
955 temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
956 else /* enable */
957 temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
958
959 writel(temp, host->base + DAVINCI_MMCCTL);
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);
968 }
969
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
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
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
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,
1154 .enable_sdio_irq = mmc_davinci_enable_sdio_irq,
1155 };
1156
1157 /*----------------------------------------------------------------------*/
1158
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
1205 static void __init init_mmcsd_host(struct mmc_davinci_host *host)
1206 {
1207
1208 mmc_davinci_reset_ctrl(host, 1);
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
1216 mmc_davinci_reset_ctrl(host, 0);
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
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
1282 host->use_dma = use_dma;
1283 host->mmc_irq = irq;
1284 host->sdio_irq = platform_get_irq(pdev, 1);
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;
1291 mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
1292
1293 if (pdata && (pdata->wires == 4 || pdata->wires == 0))
1294 mmc->caps |= MMC_CAP_4_BIT_DATA;
1295
1296 if (pdata && (pdata->wires == 8))
1297 mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
1298
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 */
1314 mmc->max_segs = 1 + host->n_link;
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
1324 dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
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
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
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
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
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:
1361 mmc_davinci_cpufreq_deregister(host);
1362 cpu_freq_fail:
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) {
1392 mmc_davinci_cpufreq_deregister(host);
1393
1394 mmc_remove_host(host->mmc);
1395 free_irq(host->mmc_irq, host);
1396 if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
1397 free_irq(host->sdio_irq, host);
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
1415 static int davinci_mmcsd_suspend(struct device *dev)
1416 {
1417 struct platform_device *pdev = to_platform_device(dev);
1418 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1419 int ret;
1420
1421 mmc_host_enable(host->mmc);
1422 ret = mmc_suspend_host(host->mmc);
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;
1435 }
1436
1437 static int davinci_mmcsd_resume(struct device *dev)
1438 {
1439 struct platform_device *pdev = to_platform_device(dev);
1440 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1441 int ret;
1442
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;
1455 }
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)
1463 #else
1464 #define davinci_mmcsd_pm_ops NULL
1465 #endif
1466
1467 static struct platform_driver davinci_mmcsd_driver = {
1468 .driver = {
1469 .name = "davinci_mmc",
1470 .owner = THIS_MODULE,
1471 .pm = davinci_mmcsd_pm_ops,
1472 },
1473 .remove = __exit_p(davinci_mmcsd_remove),
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