1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * davinci_mmc.c - TI DaVinci MMC/SD/SDIO driver
4 *
5 * Copyright (C) 2006 Texas Instruments.
6 * Original author: Purushotam Kumar
7 * Copyright (C) 2009 David Brownell
8 */
9
10 #include <linux/module.h>
11 #include <linux/ioport.h>
12 #include <linux/platform_device.h>
13 #include <linux/clk.h>
14 #include <linux/err.h>
15 #include <linux/cpufreq.h>
16 #include <linux/mmc/host.h>
17 #include <linux/io.h>
18 #include <linux/irq.h>
19 #include <linux/delay.h>
20 #include <linux/dmaengine.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/mmc/mmc.h>
23 #include <linux/of.h>
24 #include <linux/mmc/slot-gpio.h>
25 #include <linux/interrupt.h>
26
27 #include <linux/platform_data/mmc-davinci.h>
28
29 /*
30 * Register Definitions
31 */
32 #define DAVINCI_MMCCTL 0x00 /* Control Register */
33 #define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register */
34 #define DAVINCI_MMCST0 0x08 /* Status Register 0 */
35 #define DAVINCI_MMCST1 0x0C /* Status Register 1 */
36 #define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register */
37 #define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register */
38 #define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register */
39 #define DAVINCI_MMCBLEN 0x1C /* Block Length Register */
40 #define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register */
41 #define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register */
42 #define DAVINCI_MMCDRR 0x28 /* Data Receive Register */
43 #define DAVINCI_MMCDXR 0x2C /* Data Transmit Register */
44 #define DAVINCI_MMCCMD 0x30 /* Command Register */
45 #define DAVINCI_MMCARGHL 0x34 /* Argument Register */
46 #define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1 */
47 #define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1 */
48 #define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1 */
49 #define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1 */
50 #define DAVINCI_MMCDRSP 0x48 /* Data Response Register */
51 #define DAVINCI_MMCETOK 0x4C
52 #define DAVINCI_MMCCIDX 0x50 /* Command Index Register */
53 #define DAVINCI_MMCCKC 0x54
54 #define DAVINCI_MMCTORC 0x58
55 #define DAVINCI_MMCTODC 0x5C
56 #define DAVINCI_MMCBLNC 0x60
57 #define DAVINCI_SDIOCTL 0x64
58 #define DAVINCI_SDIOST0 0x68
59 #define DAVINCI_SDIOIEN 0x6C
60 #define DAVINCI_SDIOIST 0x70
61 #define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */
62
63 /* DAVINCI_MMCCTL definitions */
64 #define MMCCTL_DATRST (1 << 0)
65 #define MMCCTL_CMDRST (1 << 1)
66 #define MMCCTL_WIDTH_8_BIT (1 << 8)
67 #define MMCCTL_WIDTH_4_BIT (1 << 2)
68 #define MMCCTL_DATEG_DISABLED (0 << 6)
69 #define MMCCTL_DATEG_RISING (1 << 6)
70 #define MMCCTL_DATEG_FALLING (2 << 6)
71 #define MMCCTL_DATEG_BOTH (3 << 6)
72 #define MMCCTL_PERMDR_LE (0 << 9)
73 #define MMCCTL_PERMDR_BE (1 << 9)
74 #define MMCCTL_PERMDX_LE (0 << 10)
75 #define MMCCTL_PERMDX_BE (1 << 10)
76
77 /* DAVINCI_MMCCLK definitions */
78 #define MMCCLK_CLKEN (1 << 8)
79 #define MMCCLK_CLKRT_MASK (0xFF << 0)
80
81 /* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */
82 #define MMCST0_DATDNE BIT(0) /* data done */
83 #define MMCST0_BSYDNE BIT(1) /* busy done */
84 #define MMCST0_RSPDNE BIT(2) /* command done */
85 #define MMCST0_TOUTRD BIT(3) /* data read timeout */
86 #define MMCST0_TOUTRS BIT(4) /* command response timeout */
87 #define MMCST0_CRCWR BIT(5) /* data write CRC error */
88 #define MMCST0_CRCRD BIT(6) /* data read CRC error */
89 #define MMCST0_CRCRS BIT(7) /* command response CRC error */
90 #define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo empty) */
91 #define MMCST0_DRRDY BIT(10) /* data receive ready (data in fifo)*/
92 #define MMCST0_DATED BIT(11) /* DAT3 edge detect */
93 #define MMCST0_TRNDNE BIT(12) /* transfer done */
94
95 /* DAVINCI_MMCST1 definitions */
96 #define MMCST1_BUSY (1 << 0)
97
98 /* DAVINCI_MMCCMD definitions */
99 #define MMCCMD_CMD_MASK (0x3F << 0)
100 #define MMCCMD_PPLEN (1 << 7)
101 #define MMCCMD_BSYEXP (1 << 8)
102 #define MMCCMD_RSPFMT_MASK (3 << 9)
103 #define MMCCMD_RSPFMT_NONE (0 << 9)
104 #define MMCCMD_RSPFMT_R1456 (1 << 9)
105 #define MMCCMD_RSPFMT_R2 (2 << 9)
106 #define MMCCMD_RSPFMT_R3 (3 << 9)
107 #define MMCCMD_DTRW (1 << 11)
108 #define MMCCMD_STRMTP (1 << 12)
109 #define MMCCMD_WDATX (1 << 13)
110 #define MMCCMD_INITCK (1 << 14)
111 #define MMCCMD_DCLR (1 << 15)
112 #define MMCCMD_DMATRIG (1 << 16)
113
114 /* DAVINCI_MMCFIFOCTL definitions */
115 #define MMCFIFOCTL_FIFORST (1 << 0)
116 #define MMCFIFOCTL_FIFODIR_WR (1 << 1)
117 #define MMCFIFOCTL_FIFODIR_RD (0 << 1)
118 #define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits */
119 #define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes */
120 #define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes */
121 #define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes */
122 #define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte */
123
124 /* DAVINCI_SDIOST0 definitions */
125 #define SDIOST0_DAT1_HI BIT(0)
126
127 /* DAVINCI_SDIOIEN definitions */
128 #define SDIOIEN_IOINTEN BIT(0)
129
130 /* DAVINCI_SDIOIST definitions */
131 #define SDIOIST_IOINT BIT(0)
132
133 /* MMCSD Init clock in Hz in opendrain mode */
134 #define MMCSD_INIT_CLOCK 200000
135
136 /*
137 * One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units,
138 * and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
139 * for drivers with max_segs == 1, making the segments bigger (64KB)
140 * than the page or two that's otherwise typical. nr_sg (passed from
141 * platform data) == 16 gives at least the same throughput boost, using
142 * EDMA transfer linkage instead of spending CPU time copying pages.
143 */
144 #define MAX_CCNT ((1 << 16) - 1)
145
146 #define MAX_NR_SG 16
147
148 static unsigned rw_threshold = 32;
149 module_param(rw_threshold, uint, S_IRUGO);
150 MODULE_PARM_DESC(rw_threshold,
151 "Read/Write threshold. Default = 32");
152
153 static unsigned poll_threshold = 128;
154 module_param(poll_threshold, uint, S_IRUGO);
155 MODULE_PARM_DESC(poll_threshold,
156 "Polling transaction size threshold. Default = 128");
157
158 static unsigned poll_loopcount = 32;
159 module_param(poll_loopcount, uint, S_IRUGO);
160 MODULE_PARM_DESC(poll_loopcount,
161 "Maximum polling loop count. Default = 32");
162
163 static unsigned 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
183 u32 bytes_left;
184
185 struct dma_chan *dma_tx;
186 struct dma_chan *dma_rx;
187 bool use_dma;
188 bool do_dma;
189 bool sdio_int;
190 bool active_request;
191
192 /* For PIO we walk scatterlists one segment at a time. */
193 struct sg_mapping_iter sg_miter;
194 unsigned int sg_len;
195
196 /* Version of the MMC/SD controller */
197 u8 version;
198 /* for ns in one cycle calculation */
199 unsigned ns_in_one_cycle;
200 /* Number of sg segments */
201 u8 nr_sg;
202 #ifdef CONFIG_CPU_FREQ
203 struct notifier_block freq_transition;
204 #endif
205 };
206
207 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
208
209 /* PIO only */
davinci_fifo_data_trans(struct mmc_davinci_host * host,unsigned int n)210 static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
211 unsigned int n)
212 {
213 struct sg_mapping_iter *sgm = &host->sg_miter;
214 u8 *p;
215 unsigned int i;
216
217 /*
218 * By adjusting sgm->consumed this will give a pointer to the
219 * current index into the sgm.
220 */
221 if (!sg_miter_next(sgm)) {
222 dev_err(mmc_dev(host->mmc), "ran out of sglist prematurely\n");
223 return;
224 }
225 p = sgm->addr;
226
227 if (n > sgm->length)
228 n = sgm->length;
229
230 /* NOTE: we never transfer more than rw_threshold bytes
231 * to/from the fifo here; there's no I/O overlap.
232 * This also assumes that access width( i.e. ACCWD) is 4 bytes
233 */
234 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
235 for (i = 0; i < (n >> 2); i++) {
236 writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
237 p = p + 4;
238 }
239 if (n & 3) {
240 iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3));
241 p = p + (n & 3);
242 }
243 } else {
244 for (i = 0; i < (n >> 2); i++) {
245 *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
246 p = p + 4;
247 }
248 if (n & 3) {
249 ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3));
250 p = p + (n & 3);
251 }
252 }
253
254 sgm->consumed = n;
255 host->bytes_left -= n;
256 }
257
mmc_davinci_start_command(struct mmc_davinci_host * host,struct mmc_command * cmd)258 static void mmc_davinci_start_command(struct mmc_davinci_host *host,
259 struct mmc_command *cmd)
260 {
261 u32 cmd_reg = 0;
262 u32 im_val;
263
264 dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
265 cmd->opcode, cmd->arg,
266 ({ char *s;
267 switch (mmc_resp_type(cmd)) {
268 case MMC_RSP_R1:
269 s = ", R1/R5/R6/R7 response";
270 break;
271 case MMC_RSP_R1B:
272 s = ", R1b response";
273 break;
274 case MMC_RSP_R2:
275 s = ", R2 response";
276 break;
277 case MMC_RSP_R3:
278 s = ", R3/R4 response";
279 break;
280 default:
281 s = ", (R? response)";
282 break;
283 } s; }));
284 host->cmd = cmd;
285
286 switch (mmc_resp_type(cmd)) {
287 case MMC_RSP_R1B:
288 /* There's some spec confusion about when R1B is
289 * allowed, but if the card doesn't issue a BUSY
290 * then it's harmless for us to allow it.
291 */
292 cmd_reg |= MMCCMD_BSYEXP;
293 fallthrough;
294 case MMC_RSP_R1: /* 48 bits, CRC */
295 cmd_reg |= MMCCMD_RSPFMT_R1456;
296 break;
297 case MMC_RSP_R2: /* 136 bits, CRC */
298 cmd_reg |= MMCCMD_RSPFMT_R2;
299 break;
300 case MMC_RSP_R3: /* 48 bits, no CRC */
301 cmd_reg |= MMCCMD_RSPFMT_R3;
302 break;
303 default:
304 cmd_reg |= MMCCMD_RSPFMT_NONE;
305 dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
306 mmc_resp_type(cmd));
307 break;
308 }
309
310 /* Set command index */
311 cmd_reg |= cmd->opcode;
312
313 /* Enable EDMA transfer triggers */
314 if (host->do_dma)
315 cmd_reg |= MMCCMD_DMATRIG;
316
317 if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
318 host->data_dir == DAVINCI_MMC_DATADIR_READ)
319 cmd_reg |= MMCCMD_DMATRIG;
320
321 /* Setting whether command involves data transfer or not */
322 if (cmd->data)
323 cmd_reg |= MMCCMD_WDATX;
324
325 /* Setting whether data read or write */
326 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
327 cmd_reg |= MMCCMD_DTRW;
328
329 if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
330 cmd_reg |= MMCCMD_PPLEN;
331
332 /* set Command timeout */
333 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
334
335 /* Enable interrupt (calculate here, defer until FIFO is stuffed). */
336 im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
337 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
338 im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
339
340 if (!host->do_dma)
341 im_val |= MMCST0_DXRDY;
342 } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
343 im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
344
345 if (!host->do_dma)
346 im_val |= MMCST0_DRRDY;
347 }
348
349 /*
350 * Before non-DMA WRITE commands the controller needs priming:
351 * FIFO should be populated with 32 bytes i.e. whatever is the FIFO size
352 */
353 if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE))
354 davinci_fifo_data_trans(host, rw_threshold);
355
356 writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
357 writel(cmd_reg, host->base + DAVINCI_MMCCMD);
358
359 host->active_request = true;
360
361 if (!host->do_dma && host->bytes_left <= poll_threshold) {
362 u32 count = poll_loopcount;
363
364 while (host->active_request && count--) {
365 mmc_davinci_irq(0, host);
366 cpu_relax();
367 }
368 }
369
370 if (host->active_request)
371 writel(im_val, host->base + DAVINCI_MMCIM);
372 }
373
374 /*----------------------------------------------------------------------*/
375
376 /* DMA infrastructure */
377
davinci_abort_dma(struct mmc_davinci_host * host)378 static void davinci_abort_dma(struct mmc_davinci_host *host)
379 {
380 struct dma_chan *sync_dev;
381
382 if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
383 sync_dev = host->dma_rx;
384 else
385 sync_dev = host->dma_tx;
386
387 dmaengine_terminate_all(sync_dev);
388 }
389
mmc_davinci_send_dma_request(struct mmc_davinci_host * host,struct mmc_data * data)390 static int mmc_davinci_send_dma_request(struct mmc_davinci_host *host,
391 struct mmc_data *data)
392 {
393 struct dma_chan *chan;
394 struct dma_async_tx_descriptor *desc;
395 int ret = 0;
396
397 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
398 struct dma_slave_config dma_tx_conf = {
399 .direction = DMA_MEM_TO_DEV,
400 .dst_addr = host->mem_res->start + DAVINCI_MMCDXR,
401 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
402 .dst_maxburst =
403 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
404 };
405 chan = host->dma_tx;
406 dmaengine_slave_config(host->dma_tx, &dma_tx_conf);
407
408 desc = dmaengine_prep_slave_sg(host->dma_tx,
409 data->sg,
410 host->sg_len,
411 DMA_MEM_TO_DEV,
412 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
413 if (!desc) {
414 dev_dbg(mmc_dev(host->mmc),
415 "failed to allocate DMA TX descriptor");
416 ret = -1;
417 goto out;
418 }
419 } else {
420 struct dma_slave_config dma_rx_conf = {
421 .direction = DMA_DEV_TO_MEM,
422 .src_addr = host->mem_res->start + DAVINCI_MMCDRR,
423 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
424 .src_maxburst =
425 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
426 };
427 chan = host->dma_rx;
428 dmaengine_slave_config(host->dma_rx, &dma_rx_conf);
429
430 desc = dmaengine_prep_slave_sg(host->dma_rx,
431 data->sg,
432 host->sg_len,
433 DMA_DEV_TO_MEM,
434 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
435 if (!desc) {
436 dev_dbg(mmc_dev(host->mmc),
437 "failed to allocate DMA RX descriptor");
438 ret = -1;
439 goto out;
440 }
441 }
442
443 dmaengine_submit(desc);
444 dma_async_issue_pending(chan);
445
446 out:
447 return ret;
448 }
449
mmc_davinci_start_dma_transfer(struct mmc_davinci_host * host,struct mmc_data * data)450 static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host,
451 struct mmc_data *data)
452 {
453 int i;
454 int mask = rw_threshold - 1;
455 int ret = 0;
456
457 host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
458 mmc_get_dma_dir(data));
459
460 /* no individual DMA segment should need a partial FIFO */
461 for (i = 0; i < host->sg_len; i++) {
462 if (sg_dma_len(data->sg + i) & mask) {
463 dma_unmap_sg(mmc_dev(host->mmc),
464 data->sg, data->sg_len,
465 mmc_get_dma_dir(data));
466 return -1;
467 }
468 }
469
470 host->do_dma = 1;
471 ret = mmc_davinci_send_dma_request(host, data);
472
473 return ret;
474 }
475
davinci_release_dma_channels(struct mmc_davinci_host * host)476 static void davinci_release_dma_channels(struct mmc_davinci_host *host)
477 {
478 if (!host->use_dma)
479 return;
480
481 dma_release_channel(host->dma_tx);
482 dma_release_channel(host->dma_rx);
483 }
484
davinci_acquire_dma_channels(struct mmc_davinci_host * host)485 static int davinci_acquire_dma_channels(struct mmc_davinci_host *host)
486 {
487 host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
488 if (IS_ERR(host->dma_tx)) {
489 dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n");
490 return PTR_ERR(host->dma_tx);
491 }
492
493 host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
494 if (IS_ERR(host->dma_rx)) {
495 dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n");
496 dma_release_channel(host->dma_tx);
497 return PTR_ERR(host->dma_rx);
498 }
499
500 return 0;
501 }
502
503 /*----------------------------------------------------------------------*/
504
505 static void
mmc_davinci_prepare_data(struct mmc_davinci_host * host,struct mmc_request * req)506 mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req)
507 {
508 int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
509 int timeout;
510 struct mmc_data *data = req->data;
511 unsigned int flags = SG_MITER_ATOMIC; /* Used from IRQ */
512
513 if (host->version == MMC_CTLR_VERSION_2)
514 fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
515
516 host->data = data;
517 if (data == NULL) {
518 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
519 writel(0, host->base + DAVINCI_MMCBLEN);
520 writel(0, host->base + DAVINCI_MMCNBLK);
521 return;
522 }
523
524 dev_dbg(mmc_dev(host->mmc), "%s, %d blocks of %d bytes\n",
525 (data->flags & MMC_DATA_WRITE) ? "write" : "read",
526 data->blocks, data->blksz);
527 dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n",
528 data->timeout_clks, data->timeout_ns);
529 timeout = data->timeout_clks +
530 (data->timeout_ns / host->ns_in_one_cycle);
531 if (timeout > 0xffff)
532 timeout = 0xffff;
533
534 writel(timeout, host->base + DAVINCI_MMCTOD);
535 writel(data->blocks, host->base + DAVINCI_MMCNBLK);
536 writel(data->blksz, host->base + DAVINCI_MMCBLEN);
537
538 /* Configure the FIFO */
539 if (data->flags & MMC_DATA_WRITE) {
540 flags |= SG_MITER_FROM_SG;
541 host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
542 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST,
543 host->base + DAVINCI_MMCFIFOCTL);
544 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
545 host->base + DAVINCI_MMCFIFOCTL);
546 } else {
547 flags |= SG_MITER_TO_SG;
548 host->data_dir = DAVINCI_MMC_DATADIR_READ;
549 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST,
550 host->base + DAVINCI_MMCFIFOCTL);
551 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
552 host->base + DAVINCI_MMCFIFOCTL);
553 }
554
555 host->bytes_left = data->blocks * data->blksz;
556
557 /* For now we try to use DMA whenever we won't need partial FIFO
558 * reads or writes, either for the whole transfer (as tested here)
559 * or for any individual scatterlist segment (tested when we call
560 * start_dma_transfer).
561 *
562 * While we *could* change that, unusual block sizes are rarely
563 * used. The occasional fallback to PIO should't hurt.
564 */
565 if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
566 && mmc_davinci_start_dma_transfer(host, data) == 0) {
567 /* zero this to ensure we take no PIO paths */
568 host->bytes_left = 0;
569 } else {
570 /* Revert to CPU Copy */
571 host->sg_len = data->sg_len;
572 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
573 }
574 }
575
mmc_davinci_request(struct mmc_host * mmc,struct mmc_request * req)576 static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req)
577 {
578 struct mmc_davinci_host *host = mmc_priv(mmc);
579 unsigned long timeout = jiffies + msecs_to_jiffies(900);
580 u32 mmcst1 = 0;
581
582 /* Card may still be sending BUSY after a previous operation,
583 * typically some kind of write. If so, we can't proceed yet.
584 */
585 while (time_before(jiffies, timeout)) {
586 mmcst1 = readl(host->base + DAVINCI_MMCST1);
587 if (!(mmcst1 & MMCST1_BUSY))
588 break;
589 cpu_relax();
590 }
591 if (mmcst1 & MMCST1_BUSY) {
592 dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
593 req->cmd->error = -ETIMEDOUT;
594 mmc_request_done(mmc, req);
595 return;
596 }
597
598 host->do_dma = 0;
599 mmc_davinci_prepare_data(host, req);
600 mmc_davinci_start_command(host, req->cmd);
601 }
602
calculate_freq_for_card(struct mmc_davinci_host * host,unsigned int mmc_req_freq)603 static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host,
604 unsigned int mmc_req_freq)
605 {
606 unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0;
607
608 mmc_pclk = host->mmc_input_clk;
609 if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
610 mmc_push_pull_divisor = ((unsigned int)mmc_pclk
611 / (2 * mmc_req_freq)) - 1;
612 else
613 mmc_push_pull_divisor = 0;
614
615 mmc_freq = (unsigned int)mmc_pclk
616 / (2 * (mmc_push_pull_divisor + 1));
617
618 if (mmc_freq > mmc_req_freq)
619 mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
620 /* Convert ns to clock cycles */
621 if (mmc_req_freq <= 400000)
622 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
623 / (2 * (mmc_push_pull_divisor + 1)))/1000));
624 else
625 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
626 / (2 * (mmc_push_pull_divisor + 1)))/1000000));
627
628 return mmc_push_pull_divisor;
629 }
630
calculate_clk_divider(struct mmc_host * mmc,struct mmc_ios * ios)631 static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
632 {
633 unsigned int open_drain_freq = 0, mmc_pclk = 0;
634 unsigned int mmc_push_pull_freq = 0;
635 struct mmc_davinci_host *host = mmc_priv(mmc);
636
637 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
638 u32 temp;
639
640 /* Ignoring the init clock value passed for fixing the inter
641 * operability with different cards.
642 */
643 open_drain_freq = ((unsigned int)mmc_pclk
644 / (2 * MMCSD_INIT_CLOCK)) - 1;
645
646 if (open_drain_freq > 0xFF)
647 open_drain_freq = 0xFF;
648
649 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
650 temp |= open_drain_freq;
651 writel(temp, host->base + DAVINCI_MMCCLK);
652
653 /* Convert ns to clock cycles */
654 host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000);
655 } else {
656 u32 temp;
657 mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock);
658
659 if (mmc_push_pull_freq > 0xFF)
660 mmc_push_pull_freq = 0xFF;
661
662 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
663 writel(temp, host->base + DAVINCI_MMCCLK);
664
665 udelay(10);
666
667 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
668 temp |= mmc_push_pull_freq;
669 writel(temp, host->base + DAVINCI_MMCCLK);
670
671 writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
672
673 udelay(10);
674 }
675 }
676
mmc_davinci_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)677 static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
678 {
679 struct mmc_davinci_host *host = mmc_priv(mmc);
680 struct platform_device *pdev = to_platform_device(mmc->parent);
681 struct davinci_mmc_config *config = pdev->dev.platform_data;
682
683 dev_dbg(mmc_dev(host->mmc),
684 "clock %dHz busmode %d powermode %d Vdd %04x\n",
685 ios->clock, ios->bus_mode, ios->power_mode,
686 ios->vdd);
687
688 switch (ios->power_mode) {
689 case MMC_POWER_OFF:
690 if (config && config->set_power)
691 config->set_power(pdev->id, false);
692 break;
693 case MMC_POWER_UP:
694 if (config && config->set_power)
695 config->set_power(pdev->id, true);
696 break;
697 }
698
699 switch (ios->bus_width) {
700 case MMC_BUS_WIDTH_8:
701 dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");
702 writel((readl(host->base + DAVINCI_MMCCTL) &
703 ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT,
704 host->base + DAVINCI_MMCCTL);
705 break;
706 case MMC_BUS_WIDTH_4:
707 dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
708 if (host->version == MMC_CTLR_VERSION_2)
709 writel((readl(host->base + DAVINCI_MMCCTL) &
710 ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT,
711 host->base + DAVINCI_MMCCTL);
712 else
713 writel(readl(host->base + DAVINCI_MMCCTL) |
714 MMCCTL_WIDTH_4_BIT,
715 host->base + DAVINCI_MMCCTL);
716 break;
717 case MMC_BUS_WIDTH_1:
718 dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n");
719 if (host->version == MMC_CTLR_VERSION_2)
720 writel(readl(host->base + DAVINCI_MMCCTL) &
721 ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT),
722 host->base + DAVINCI_MMCCTL);
723 else
724 writel(readl(host->base + DAVINCI_MMCCTL) &
725 ~MMCCTL_WIDTH_4_BIT,
726 host->base + DAVINCI_MMCCTL);
727 break;
728 }
729
730 calculate_clk_divider(mmc, ios);
731
732 host->bus_mode = ios->bus_mode;
733 if (ios->power_mode == MMC_POWER_UP) {
734 unsigned long timeout = jiffies + msecs_to_jiffies(50);
735 bool lose = true;
736
737 /* Send clock cycles, poll completion */
738 writel(0, host->base + DAVINCI_MMCARGHL);
739 writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
740 while (time_before(jiffies, timeout)) {
741 u32 tmp = readl(host->base + DAVINCI_MMCST0);
742
743 if (tmp & MMCST0_RSPDNE) {
744 lose = false;
745 break;
746 }
747 cpu_relax();
748 }
749 if (lose)
750 dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
751 }
752
753 /* FIXME on power OFF, reset things ... */
754 }
755
756 static void
mmc_davinci_xfer_done(struct mmc_davinci_host * host,struct mmc_data * data)757 mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
758 {
759 host->data = NULL;
760
761 if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
762 /*
763 * SDIO Interrupt Detection work-around as suggested by
764 * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
765 * 2.1.6): Signal SDIO interrupt only if it is enabled by core
766 */
767 if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) &
768 SDIOST0_DAT1_HI)) {
769 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
770 mmc_signal_sdio_irq(host->mmc);
771 }
772 }
773
774 if (host->do_dma) {
775 davinci_abort_dma(host);
776
777 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
778 mmc_get_dma_dir(data));
779 host->do_dma = false;
780 }
781 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
782
783 if (!data->stop || (host->cmd && host->cmd->error)) {
784 mmc_request_done(host->mmc, data->mrq);
785 writel(0, host->base + DAVINCI_MMCIM);
786 host->active_request = false;
787 } else
788 mmc_davinci_start_command(host, data->stop);
789 }
790
mmc_davinci_cmd_done(struct mmc_davinci_host * host,struct mmc_command * cmd)791 static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
792 struct mmc_command *cmd)
793 {
794 host->cmd = NULL;
795
796 if (cmd->flags & MMC_RSP_PRESENT) {
797 if (cmd->flags & MMC_RSP_136) {
798 /* response type 2 */
799 cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
800 cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
801 cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
802 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
803 } else {
804 /* response types 1, 1b, 3, 4, 5, 6 */
805 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
806 }
807 }
808
809 if (host->data == NULL || cmd->error) {
810 if (cmd->error == -ETIMEDOUT)
811 cmd->mrq->cmd->retries = 0;
812 mmc_request_done(host->mmc, cmd->mrq);
813 writel(0, host->base + DAVINCI_MMCIM);
814 host->active_request = false;
815 }
816 }
817
mmc_davinci_reset_ctrl(struct mmc_davinci_host * host,int val)818 static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
819 int val)
820 {
821 u32 temp;
822
823 temp = readl(host->base + DAVINCI_MMCCTL);
824 if (val) /* reset */
825 temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
826 else /* enable */
827 temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
828
829 writel(temp, host->base + DAVINCI_MMCCTL);
830 udelay(10);
831 }
832
833 static void
davinci_abort_data(struct mmc_davinci_host * host,struct mmc_data * data)834 davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
835 {
836 mmc_davinci_reset_ctrl(host, 1);
837 mmc_davinci_reset_ctrl(host, 0);
838 if (!host->do_dma)
839 sg_miter_stop(&host->sg_miter);
840 }
841
mmc_davinci_sdio_irq(int irq,void * dev_id)842 static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
843 {
844 struct mmc_davinci_host *host = dev_id;
845 unsigned int status;
846
847 status = readl(host->base + DAVINCI_SDIOIST);
848 if (status & SDIOIST_IOINT) {
849 dev_dbg(mmc_dev(host->mmc),
850 "SDIO interrupt status %x\n", status);
851 writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
852 mmc_signal_sdio_irq(host->mmc);
853 }
854 return IRQ_HANDLED;
855 }
856
mmc_davinci_irq(int irq,void * dev_id)857 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
858 {
859 struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
860 unsigned int status, qstatus;
861 int end_command = 0;
862 int end_transfer = 0;
863 struct mmc_data *data = host->data;
864
865 if (host->cmd == NULL && host->data == NULL) {
866 status = readl(host->base + DAVINCI_MMCST0);
867 dev_dbg(mmc_dev(host->mmc),
868 "Spurious interrupt 0x%04x\n", status);
869 /* Disable the interrupt from mmcsd */
870 writel(0, host->base + DAVINCI_MMCIM);
871 return IRQ_NONE;
872 }
873
874 status = readl(host->base + DAVINCI_MMCST0);
875 qstatus = status;
876
877 /* handle FIFO first when using PIO for data.
878 * bytes_left will decrease to zero as I/O progress and status will
879 * read zero over iteration because this controller status
880 * register(MMCST0) reports any status only once and it is cleared
881 * by read. So, it is not unbouned loop even in the case of
882 * non-dma.
883 */
884 if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
885 unsigned long im_val;
886
887 /*
888 * If interrupts fire during the following loop, they will be
889 * handled by the handler, but the PIC will still buffer these.
890 * As a result, the handler will be called again to serve these
891 * needlessly. In order to avoid these spurious interrupts,
892 * keep interrupts masked during the loop.
893 */
894 im_val = readl(host->base + DAVINCI_MMCIM);
895 writel(0, host->base + DAVINCI_MMCIM);
896
897 do {
898 davinci_fifo_data_trans(host, rw_threshold);
899 status = readl(host->base + DAVINCI_MMCST0);
900 qstatus |= status;
901 } while (host->bytes_left &&
902 (status & (MMCST0_DXRDY | MMCST0_DRRDY)));
903
904 /*
905 * If an interrupt is pending, it is assumed it will fire when
906 * it is unmasked. This assumption is also taken when the MMCIM
907 * is first set. Otherwise, writing to MMCIM after reading the
908 * status is race-prone.
909 */
910 writel(im_val, host->base + DAVINCI_MMCIM);
911 }
912
913 if (qstatus & MMCST0_DATDNE) {
914 /* All blocks sent/received, and CRC checks passed */
915 if (data != NULL) {
916 if (!host->do_dma) {
917 if (host->bytes_left > 0)
918 /* if datasize < rw_threshold
919 * no RX ints are generated
920 */
921 davinci_fifo_data_trans(host, host->bytes_left);
922 sg_miter_stop(&host->sg_miter);
923 }
924 end_transfer = 1;
925 data->bytes_xfered = data->blocks * data->blksz;
926 } else {
927 dev_err(mmc_dev(host->mmc),
928 "DATDNE with no host->data\n");
929 }
930 }
931
932 if (qstatus & MMCST0_TOUTRD) {
933 /* Read data timeout */
934 data->error = -ETIMEDOUT;
935 end_transfer = 1;
936
937 dev_dbg(mmc_dev(host->mmc),
938 "read data timeout, status %x\n",
939 qstatus);
940
941 davinci_abort_data(host, data);
942 }
943
944 if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
945 /* Data CRC error */
946 data->error = -EILSEQ;
947 end_transfer = 1;
948
949 /* NOTE: this controller uses CRCWR to report both CRC
950 * errors and timeouts (on writes). MMCDRSP values are
951 * only weakly documented, but 0x9f was clearly a timeout
952 * case and the two three-bit patterns in various SD specs
953 * (101, 010) aren't part of it ...
954 */
955 if (qstatus & MMCST0_CRCWR) {
956 u32 temp = readb(host->base + DAVINCI_MMCDRSP);
957
958 if (temp == 0x9f)
959 data->error = -ETIMEDOUT;
960 }
961 dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
962 (qstatus & MMCST0_CRCWR) ? "write" : "read",
963 (data->error == -ETIMEDOUT) ? "timeout" : "CRC");
964
965 davinci_abort_data(host, data);
966 }
967
968 if (qstatus & MMCST0_TOUTRS) {
969 /* Command timeout */
970 if (host->cmd) {
971 dev_dbg(mmc_dev(host->mmc),
972 "CMD%d timeout, status %x\n",
973 host->cmd->opcode, qstatus);
974 host->cmd->error = -ETIMEDOUT;
975 if (data) {
976 end_transfer = 1;
977 davinci_abort_data(host, data);
978 } else
979 end_command = 1;
980 }
981 }
982
983 if (qstatus & MMCST0_CRCRS) {
984 /* Command CRC error */
985 dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
986 if (host->cmd) {
987 host->cmd->error = -EILSEQ;
988 end_command = 1;
989 }
990 }
991
992 if (qstatus & MMCST0_RSPDNE) {
993 /* End of command phase */
994 end_command = host->cmd ? 1 : 0;
995 }
996
997 if (end_command)
998 mmc_davinci_cmd_done(host, host->cmd);
999 if (end_transfer)
1000 mmc_davinci_xfer_done(host, data);
1001 return IRQ_HANDLED;
1002 }
1003
mmc_davinci_get_cd(struct mmc_host * mmc)1004 static int mmc_davinci_get_cd(struct mmc_host *mmc)
1005 {
1006 struct platform_device *pdev = to_platform_device(mmc->parent);
1007 struct davinci_mmc_config *config = pdev->dev.platform_data;
1008
1009 if (config && config->get_cd)
1010 return config->get_cd(pdev->id);
1011
1012 return mmc_gpio_get_cd(mmc);
1013 }
1014
mmc_davinci_get_ro(struct mmc_host * mmc)1015 static int mmc_davinci_get_ro(struct mmc_host *mmc)
1016 {
1017 struct platform_device *pdev = to_platform_device(mmc->parent);
1018 struct davinci_mmc_config *config = pdev->dev.platform_data;
1019
1020 if (config && config->get_ro)
1021 return config->get_ro(pdev->id);
1022
1023 return mmc_gpio_get_ro(mmc);
1024 }
1025
mmc_davinci_enable_sdio_irq(struct mmc_host * mmc,int enable)1026 static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1027 {
1028 struct mmc_davinci_host *host = mmc_priv(mmc);
1029
1030 if (enable) {
1031 if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) {
1032 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
1033 mmc_signal_sdio_irq(host->mmc);
1034 } else {
1035 host->sdio_int = true;
1036 writel(readl(host->base + DAVINCI_SDIOIEN) |
1037 SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
1038 }
1039 } else {
1040 host->sdio_int = false;
1041 writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
1042 host->base + DAVINCI_SDIOIEN);
1043 }
1044 }
1045
1046 static const struct mmc_host_ops mmc_davinci_ops = {
1047 .request = mmc_davinci_request,
1048 .set_ios = mmc_davinci_set_ios,
1049 .get_cd = mmc_davinci_get_cd,
1050 .get_ro = mmc_davinci_get_ro,
1051 .enable_sdio_irq = mmc_davinci_enable_sdio_irq,
1052 };
1053
1054 /*----------------------------------------------------------------------*/
1055
1056 #ifdef CONFIG_CPU_FREQ
mmc_davinci_cpufreq_transition(struct notifier_block * nb,unsigned long val,void * data)1057 static int mmc_davinci_cpufreq_transition(struct notifier_block *nb,
1058 unsigned long val, void *data)
1059 {
1060 struct mmc_davinci_host *host;
1061 unsigned int mmc_pclk;
1062 struct mmc_host *mmc;
1063 unsigned long flags;
1064
1065 host = container_of(nb, struct mmc_davinci_host, freq_transition);
1066 mmc = host->mmc;
1067 mmc_pclk = clk_get_rate(host->clk);
1068
1069 if (val == CPUFREQ_POSTCHANGE) {
1070 spin_lock_irqsave(&mmc->lock, flags);
1071 host->mmc_input_clk = mmc_pclk;
1072 calculate_clk_divider(mmc, &mmc->ios);
1073 spin_unlock_irqrestore(&mmc->lock, flags);
1074 }
1075
1076 return 0;
1077 }
1078
mmc_davinci_cpufreq_register(struct mmc_davinci_host * host)1079 static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1080 {
1081 host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition;
1082
1083 return cpufreq_register_notifier(&host->freq_transition,
1084 CPUFREQ_TRANSITION_NOTIFIER);
1085 }
1086
mmc_davinci_cpufreq_deregister(struct mmc_davinci_host * host)1087 static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1088 {
1089 cpufreq_unregister_notifier(&host->freq_transition,
1090 CPUFREQ_TRANSITION_NOTIFIER);
1091 }
1092 #else
mmc_davinci_cpufreq_register(struct mmc_davinci_host * host)1093 static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1094 {
1095 return 0;
1096 }
1097
mmc_davinci_cpufreq_deregister(struct mmc_davinci_host * host)1098 static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1099 {
1100 }
1101 #endif
init_mmcsd_host(struct mmc_davinci_host * host)1102 static void init_mmcsd_host(struct mmc_davinci_host *host)
1103 {
1104
1105 mmc_davinci_reset_ctrl(host, 1);
1106
1107 writel(0, host->base + DAVINCI_MMCCLK);
1108 writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
1109
1110 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
1111 writel(0xFFFF, host->base + DAVINCI_MMCTOD);
1112
1113 mmc_davinci_reset_ctrl(host, 0);
1114 }
1115
1116 static const struct platform_device_id davinci_mmc_devtype[] = {
1117 {
1118 .name = "dm6441-mmc",
1119 .driver_data = MMC_CTLR_VERSION_1,
1120 }, {
1121 .name = "da830-mmc",
1122 .driver_data = MMC_CTLR_VERSION_2,
1123 },
1124 {},
1125 };
1126 MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype);
1127
1128 static const struct of_device_id davinci_mmc_dt_ids[] = {
1129 {
1130 .compatible = "ti,dm6441-mmc",
1131 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1],
1132 },
1133 {
1134 .compatible = "ti,da830-mmc",
1135 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2],
1136 },
1137 {},
1138 };
1139 MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
1140
mmc_davinci_parse_pdata(struct mmc_host * mmc)1141 static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
1142 {
1143 struct platform_device *pdev = to_platform_device(mmc->parent);
1144 struct davinci_mmc_config *pdata = pdev->dev.platform_data;
1145 struct mmc_davinci_host *host;
1146 int ret;
1147
1148 if (!pdata)
1149 return -EINVAL;
1150
1151 host = mmc_priv(mmc);
1152 if (!host)
1153 return -EINVAL;
1154
1155 if (pdata && pdata->nr_sg)
1156 host->nr_sg = pdata->nr_sg - 1;
1157
1158 if (pdata && (pdata->wires == 4 || pdata->wires == 0))
1159 mmc->caps |= MMC_CAP_4_BIT_DATA;
1160
1161 if (pdata && (pdata->wires == 8))
1162 mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
1163
1164 mmc->f_min = 312500;
1165 mmc->f_max = 25000000;
1166 if (pdata && pdata->max_freq)
1167 mmc->f_max = pdata->max_freq;
1168 if (pdata && pdata->caps)
1169 mmc->caps |= pdata->caps;
1170
1171 /* Register a cd gpio, if there is not one, enable polling */
1172 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
1173 if (ret == -EPROBE_DEFER)
1174 return ret;
1175 else if (ret)
1176 mmc->caps |= MMC_CAP_NEEDS_POLL;
1177
1178 ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
1179 if (ret == -EPROBE_DEFER)
1180 return ret;
1181
1182 return 0;
1183 }
1184
davinci_mmcsd_probe(struct platform_device * pdev)1185 static int davinci_mmcsd_probe(struct platform_device *pdev)
1186 {
1187 struct mmc_davinci_host *host = NULL;
1188 struct mmc_host *mmc = NULL;
1189 struct resource *r, *mem = NULL;
1190 int ret, irq, bus_width;
1191 size_t mem_size;
1192 const struct platform_device_id *id_entry;
1193
1194 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1195 if (!r)
1196 return -ENODEV;
1197 irq = platform_get_irq(pdev, 0);
1198 if (irq < 0)
1199 return irq;
1200
1201 mem_size = resource_size(r);
1202 mem = devm_request_mem_region(&pdev->dev, r->start, mem_size,
1203 pdev->name);
1204 if (!mem)
1205 return -EBUSY;
1206
1207 mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
1208 if (!mmc)
1209 return -ENOMEM;
1210
1211 host = mmc_priv(mmc);
1212 host->mmc = mmc; /* Important */
1213
1214 host->mem_res = mem;
1215 host->base = devm_ioremap(&pdev->dev, mem->start, mem_size);
1216 if (!host->base) {
1217 ret = -ENOMEM;
1218 goto ioremap_fail;
1219 }
1220
1221 host->clk = devm_clk_get(&pdev->dev, NULL);
1222 if (IS_ERR(host->clk)) {
1223 ret = PTR_ERR(host->clk);
1224 goto clk_get_fail;
1225 }
1226 ret = clk_prepare_enable(host->clk);
1227 if (ret)
1228 goto clk_prepare_enable_fail;
1229
1230 host->mmc_input_clk = clk_get_rate(host->clk);
1231
1232 pdev->id_entry = of_device_get_match_data(&pdev->dev);
1233 if (pdev->id_entry) {
1234 ret = mmc_of_parse(mmc);
1235 if (ret) {
1236 dev_err_probe(&pdev->dev, ret,
1237 "could not parse of data\n");
1238 goto parse_fail;
1239 }
1240 } else {
1241 ret = mmc_davinci_parse_pdata(mmc);
1242 if (ret) {
1243 dev_err(&pdev->dev,
1244 "could not parse platform data: %d\n", ret);
1245 goto parse_fail;
1246 } }
1247
1248 if (host->nr_sg > MAX_NR_SG || !host->nr_sg)
1249 host->nr_sg = MAX_NR_SG;
1250
1251 init_mmcsd_host(host);
1252
1253 host->use_dma = use_dma;
1254 host->mmc_irq = irq;
1255 host->sdio_irq = platform_get_irq_optional(pdev, 1);
1256
1257 if (host->use_dma) {
1258 ret = davinci_acquire_dma_channels(host);
1259 if (ret == -EPROBE_DEFER)
1260 goto dma_probe_defer;
1261 else if (ret)
1262 host->use_dma = 0;
1263 }
1264
1265 mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
1266
1267 id_entry = platform_get_device_id(pdev);
1268 if (id_entry)
1269 host->version = id_entry->driver_data;
1270
1271 mmc->ops = &mmc_davinci_ops;
1272 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1273
1274 /* With no iommu coalescing pages, each phys_seg is a hw_seg.
1275 * Each hw_seg uses one EDMA parameter RAM slot, always one
1276 * channel and then usually some linked slots.
1277 */
1278 mmc->max_segs = MAX_NR_SG;
1279
1280 /* EDMA limit per hw segment (one or two MBytes) */
1281 mmc->max_seg_size = MAX_CCNT * rw_threshold;
1282
1283 /* MMC/SD controller limits for multiblock requests */
1284 mmc->max_blk_size = 4095; /* BLEN is 12 bits */
1285 mmc->max_blk_count = 65535; /* NBLK is 16 bits */
1286 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1287
1288 dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
1289 dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size);
1290 dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size);
1291 dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size);
1292
1293 platform_set_drvdata(pdev, host);
1294
1295 ret = mmc_davinci_cpufreq_register(host);
1296 if (ret) {
1297 dev_err(&pdev->dev, "failed to register cpufreq\n");
1298 goto cpu_freq_fail;
1299 }
1300
1301 ret = mmc_add_host(mmc);
1302 if (ret < 0)
1303 goto mmc_add_host_fail;
1304
1305 ret = devm_request_irq(&pdev->dev, irq, mmc_davinci_irq, 0,
1306 mmc_hostname(mmc), host);
1307 if (ret)
1308 goto request_irq_fail;
1309
1310 if (host->sdio_irq >= 0) {
1311 ret = devm_request_irq(&pdev->dev, host->sdio_irq,
1312 mmc_davinci_sdio_irq, 0,
1313 mmc_hostname(mmc), host);
1314 if (!ret)
1315 mmc->caps |= MMC_CAP_SDIO_IRQ;
1316 }
1317
1318 rename_region(mem, mmc_hostname(mmc));
1319
1320 if (mmc->caps & MMC_CAP_8_BIT_DATA)
1321 bus_width = 8;
1322 else if (mmc->caps & MMC_CAP_4_BIT_DATA)
1323 bus_width = 4;
1324 else
1325 bus_width = 1;
1326 dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
1327 host->use_dma ? "DMA" : "PIO", bus_width);
1328
1329 return 0;
1330
1331 request_irq_fail:
1332 mmc_remove_host(mmc);
1333 mmc_add_host_fail:
1334 mmc_davinci_cpufreq_deregister(host);
1335 cpu_freq_fail:
1336 davinci_release_dma_channels(host);
1337 parse_fail:
1338 dma_probe_defer:
1339 clk_disable_unprepare(host->clk);
1340 clk_prepare_enable_fail:
1341 clk_get_fail:
1342 ioremap_fail:
1343 mmc_free_host(mmc);
1344
1345 return ret;
1346 }
1347
davinci_mmcsd_remove(struct platform_device * pdev)1348 static void davinci_mmcsd_remove(struct platform_device *pdev)
1349 {
1350 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1351
1352 mmc_remove_host(host->mmc);
1353 mmc_davinci_cpufreq_deregister(host);
1354 davinci_release_dma_channels(host);
1355 clk_disable_unprepare(host->clk);
1356 mmc_free_host(host->mmc);
1357 }
1358
1359 #ifdef CONFIG_PM
davinci_mmcsd_suspend(struct device * dev)1360 static int davinci_mmcsd_suspend(struct device *dev)
1361 {
1362 struct mmc_davinci_host *host = dev_get_drvdata(dev);
1363
1364 writel(0, host->base + DAVINCI_MMCIM);
1365 mmc_davinci_reset_ctrl(host, 1);
1366 clk_disable(host->clk);
1367
1368 return 0;
1369 }
1370
davinci_mmcsd_resume(struct device * dev)1371 static int davinci_mmcsd_resume(struct device *dev)
1372 {
1373 struct mmc_davinci_host *host = dev_get_drvdata(dev);
1374 int ret;
1375
1376 ret = clk_enable(host->clk);
1377 if (ret)
1378 return ret;
1379
1380 mmc_davinci_reset_ctrl(host, 0);
1381
1382 return 0;
1383 }
1384
1385 static const struct dev_pm_ops davinci_mmcsd_pm = {
1386 .suspend = davinci_mmcsd_suspend,
1387 .resume = davinci_mmcsd_resume,
1388 };
1389
1390 #define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
1391 #else
1392 #define davinci_mmcsd_pm_ops NULL
1393 #endif
1394
1395 static struct platform_driver davinci_mmcsd_driver = {
1396 .driver = {
1397 .name = "davinci_mmc",
1398 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1399 .pm = davinci_mmcsd_pm_ops,
1400 .of_match_table = davinci_mmc_dt_ids,
1401 },
1402 .probe = davinci_mmcsd_probe,
1403 .remove_new = davinci_mmcsd_remove,
1404 .id_table = davinci_mmc_devtype,
1405 };
1406
1407 module_platform_driver(davinci_mmcsd_driver);
1408
1409 MODULE_AUTHOR("Texas Instruments India");
1410 MODULE_LICENSE("GPL");
1411 MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
1412 MODULE_ALIAS("platform:davinci_mmc");
1413
1414