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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/of_device.h>
25#include <linux/mmc/slot-gpio.h>
26#include <linux/interrupt.h>
27
28#include <linux/platform_data/mmc-davinci.h>
29
30/*
31 * Register Definitions
32 */
33#define DAVINCI_MMCCTL 0x00 /* Control Register */
34#define DAVINCI_MMCCLK 0x04 /* Memory Clock Control Register */
35#define DAVINCI_MMCST0 0x08 /* Status Register 0 */
36#define DAVINCI_MMCST1 0x0C /* Status Register 1 */
37#define DAVINCI_MMCIM 0x10 /* Interrupt Mask Register */
38#define DAVINCI_MMCTOR 0x14 /* Response Time-Out Register */
39#define DAVINCI_MMCTOD 0x18 /* Data Read Time-Out Register */
40#define DAVINCI_MMCBLEN 0x1C /* Block Length Register */
41#define DAVINCI_MMCNBLK 0x20 /* Number of Blocks Register */
42#define DAVINCI_MMCNBLC 0x24 /* Number of Blocks Counter Register */
43#define DAVINCI_MMCDRR 0x28 /* Data Receive Register */
44#define DAVINCI_MMCDXR 0x2C /* Data Transmit Register */
45#define DAVINCI_MMCCMD 0x30 /* Command Register */
46#define DAVINCI_MMCARGHL 0x34 /* Argument Register */
47#define DAVINCI_MMCRSP01 0x38 /* Response Register 0 and 1 */
48#define DAVINCI_MMCRSP23 0x3C /* Response Register 0 and 1 */
49#define DAVINCI_MMCRSP45 0x40 /* Response Register 0 and 1 */
50#define DAVINCI_MMCRSP67 0x44 /* Response Register 0 and 1 */
51#define DAVINCI_MMCDRSP 0x48 /* Data Response Register */
52#define DAVINCI_MMCETOK 0x4C
53#define DAVINCI_MMCCIDX 0x50 /* Command Index Register */
54#define DAVINCI_MMCCKC 0x54
55#define DAVINCI_MMCTORC 0x58
56#define DAVINCI_MMCTODC 0x5C
57#define DAVINCI_MMCBLNC 0x60
58#define DAVINCI_SDIOCTL 0x64
59#define DAVINCI_SDIOST0 0x68
60#define DAVINCI_SDIOIEN 0x6C
61#define DAVINCI_SDIOIST 0x70
62#define DAVINCI_MMCFIFOCTL 0x74 /* FIFO Control Register */
63
64/* DAVINCI_MMCCTL definitions */
65#define MMCCTL_DATRST (1 << 0)
66#define MMCCTL_CMDRST (1 << 1)
67#define MMCCTL_WIDTH_8_BIT (1 << 8)
68#define MMCCTL_WIDTH_4_BIT (1 << 2)
69#define MMCCTL_DATEG_DISABLED (0 << 6)
70#define MMCCTL_DATEG_RISING (1 << 6)
71#define MMCCTL_DATEG_FALLING (2 << 6)
72#define MMCCTL_DATEG_BOTH (3 << 6)
73#define MMCCTL_PERMDR_LE (0 << 9)
74#define MMCCTL_PERMDR_BE (1 << 9)
75#define MMCCTL_PERMDX_LE (0 << 10)
76#define MMCCTL_PERMDX_BE (1 << 10)
77
78/* DAVINCI_MMCCLK definitions */
79#define MMCCLK_CLKEN (1 << 8)
80#define MMCCLK_CLKRT_MASK (0xFF << 0)
81
82/* IRQ bit definitions, for DAVINCI_MMCST0 and DAVINCI_MMCIM */
83#define MMCST0_DATDNE BIT(0) /* data done */
84#define MMCST0_BSYDNE BIT(1) /* busy done */
85#define MMCST0_RSPDNE BIT(2) /* command done */
86#define MMCST0_TOUTRD BIT(3) /* data read timeout */
87#define MMCST0_TOUTRS BIT(4) /* command response timeout */
88#define MMCST0_CRCWR BIT(5) /* data write CRC error */
89#define MMCST0_CRCRD BIT(6) /* data read CRC error */
90#define MMCST0_CRCRS BIT(7) /* command response CRC error */
91#define MMCST0_DXRDY BIT(9) /* data transmit ready (fifo empty) */
92#define MMCST0_DRRDY BIT(10) /* data receive ready (data in fifo)*/
93#define MMCST0_DATED BIT(11) /* DAT3 edge detect */
94#define MMCST0_TRNDNE BIT(12) /* transfer done */
95
96/* DAVINCI_MMCST1 definitions */
97#define MMCST1_BUSY (1 << 0)
98
99/* DAVINCI_MMCCMD definitions */
100#define MMCCMD_CMD_MASK (0x3F << 0)
101#define MMCCMD_PPLEN (1 << 7)
102#define MMCCMD_BSYEXP (1 << 8)
103#define MMCCMD_RSPFMT_MASK (3 << 9)
104#define MMCCMD_RSPFMT_NONE (0 << 9)
105#define MMCCMD_RSPFMT_R1456 (1 << 9)
106#define MMCCMD_RSPFMT_R2 (2 << 9)
107#define MMCCMD_RSPFMT_R3 (3 << 9)
108#define MMCCMD_DTRW (1 << 11)
109#define MMCCMD_STRMTP (1 << 12)
110#define MMCCMD_WDATX (1 << 13)
111#define MMCCMD_INITCK (1 << 14)
112#define MMCCMD_DCLR (1 << 15)
113#define MMCCMD_DMATRIG (1 << 16)
114
115/* DAVINCI_MMCFIFOCTL definitions */
116#define MMCFIFOCTL_FIFORST (1 << 0)
117#define MMCFIFOCTL_FIFODIR_WR (1 << 1)
118#define MMCFIFOCTL_FIFODIR_RD (0 << 1)
119#define MMCFIFOCTL_FIFOLEV (1 << 2) /* 0 = 128 bits, 1 = 256 bits */
120#define MMCFIFOCTL_ACCWD_4 (0 << 3) /* access width of 4 bytes */
121#define MMCFIFOCTL_ACCWD_3 (1 << 3) /* access width of 3 bytes */
122#define MMCFIFOCTL_ACCWD_2 (2 << 3) /* access width of 2 bytes */
123#define MMCFIFOCTL_ACCWD_1 (3 << 3) /* access width of 1 byte */
124
125/* DAVINCI_SDIOST0 definitions */
126#define SDIOST0_DAT1_HI BIT(0)
127
128/* DAVINCI_SDIOIEN definitions */
129#define SDIOIEN_IOINTEN BIT(0)
130
131/* DAVINCI_SDIOIST definitions */
132#define SDIOIST_IOINT BIT(0)
133
134/* MMCSD Init clock in Hz in opendrain mode */
135#define MMCSD_INIT_CLOCK 200000
136
137/*
138 * One scatterlist dma "segment" is at most MAX_CCNT rw_threshold units,
139 * and we handle up to MAX_NR_SG segments. MMC_BLOCK_BOUNCE kicks in only
140 * for drivers with max_segs == 1, making the segments bigger (64KB)
141 * than the page or two that's otherwise typical. nr_sg (passed from
142 * platform data) == 16 gives at least the same throughput boost, using
143 * EDMA transfer linkage instead of spending CPU time copying pages.
144 */
145#define MAX_CCNT ((1 << 16) - 1)
146
147#define MAX_NR_SG 16
148
149static unsigned rw_threshold = 32;
150module_param(rw_threshold, uint, S_IRUGO);
151MODULE_PARM_DESC(rw_threshold,
152 "Read/Write threshold. Default = 32");
153
154static unsigned poll_threshold = 128;
155module_param(poll_threshold, uint, S_IRUGO);
156MODULE_PARM_DESC(poll_threshold,
157 "Polling transaction size threshold. Default = 128");
158
159static unsigned poll_loopcount = 32;
160module_param(poll_loopcount, uint, S_IRUGO);
161MODULE_PARM_DESC(poll_loopcount,
162 "Maximum polling loop count. Default = 32");
163
164static unsigned use_dma = 1;
165module_param(use_dma, uint, 0);
166MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
167
168struct mmc_davinci_host {
169 struct mmc_command *cmd;
170 struct mmc_data *data;
171 struct mmc_host *mmc;
172 struct clk *clk;
173 unsigned int mmc_input_clk;
174 void __iomem *base;
175 struct resource *mem_res;
176 int mmc_irq, sdio_irq;
177 unsigned char bus_mode;
178
179#define DAVINCI_MMC_DATADIR_NONE 0
180#define DAVINCI_MMC_DATADIR_READ 1
181#define DAVINCI_MMC_DATADIR_WRITE 2
182 unsigned char data_dir;
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 struct dma_chan *dma_tx;
193 struct dma_chan *dma_rx;
194 bool use_dma;
195 bool do_dma;
196 bool sdio_int;
197 bool active_request;
198
199 /* For PIO we walk scatterlists one segment at a time. */
200 unsigned int sg_len;
201 struct scatterlist *sg;
202
203 /* Version of the MMC/SD controller */
204 u8 version;
205 /* for ns in one cycle calculation */
206 unsigned ns_in_one_cycle;
207 /* Number of sg segments */
208 u8 nr_sg;
209#ifdef CONFIG_CPU_FREQ
210 struct notifier_block freq_transition;
211#endif
212};
213
214static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
215
216/* PIO only */
217static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
218{
219 host->buffer_bytes_left = sg_dma_len(host->sg);
220 host->buffer = sg_virt(host->sg);
221 if (host->buffer_bytes_left > host->bytes_left)
222 host->buffer_bytes_left = host->bytes_left;
223}
224
225static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
226 unsigned int n)
227{
228 u8 *p;
229 unsigned int i;
230
231 if (host->buffer_bytes_left == 0) {
232 host->sg = sg_next(host->data->sg);
233 mmc_davinci_sg_to_buf(host);
234 }
235
236 p = host->buffer;
237 if (n > host->buffer_bytes_left)
238 n = host->buffer_bytes_left;
239 host->buffer_bytes_left -= n;
240 host->bytes_left -= n;
241
242 /* NOTE: we never transfer more than rw_threshold bytes
243 * to/from the fifo here; there's no I/O overlap.
244 * This also assumes that access width( i.e. ACCWD) is 4 bytes
245 */
246 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
247 for (i = 0; i < (n >> 2); i++) {
248 writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
249 p = p + 4;
250 }
251 if (n & 3) {
252 iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3));
253 p = p + (n & 3);
254 }
255 } else {
256 for (i = 0; i < (n >> 2); i++) {
257 *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
258 p = p + 4;
259 }
260 if (n & 3) {
261 ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3));
262 p = p + (n & 3);
263 }
264 }
265 host->buffer = p;
266}
267
268static void mmc_davinci_start_command(struct mmc_davinci_host *host,
269 struct mmc_command *cmd)
270{
271 u32 cmd_reg = 0;
272 u32 im_val;
273
274 dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
275 cmd->opcode, cmd->arg,
276 ({ char *s;
277 switch (mmc_resp_type(cmd)) {
278 case MMC_RSP_R1:
279 s = ", R1/R5/R6/R7 response";
280 break;
281 case MMC_RSP_R1B:
282 s = ", R1b response";
283 break;
284 case MMC_RSP_R2:
285 s = ", R2 response";
286 break;
287 case MMC_RSP_R3:
288 s = ", R3/R4 response";
289 break;
290 default:
291 s = ", (R? response)";
292 break;
293 } s; }));
294 host->cmd = cmd;
295
296 switch (mmc_resp_type(cmd)) {
297 case MMC_RSP_R1B:
298 /* There's some spec confusion about when R1B is
299 * allowed, but if the card doesn't issue a BUSY
300 * then it's harmless for us to allow it.
301 */
302 cmd_reg |= MMCCMD_BSYEXP;
303 fallthrough;
304 case MMC_RSP_R1: /* 48 bits, CRC */
305 cmd_reg |= MMCCMD_RSPFMT_R1456;
306 break;
307 case MMC_RSP_R2: /* 136 bits, CRC */
308 cmd_reg |= MMCCMD_RSPFMT_R2;
309 break;
310 case MMC_RSP_R3: /* 48 bits, no CRC */
311 cmd_reg |= MMCCMD_RSPFMT_R3;
312 break;
313 default:
314 cmd_reg |= MMCCMD_RSPFMT_NONE;
315 dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
316 mmc_resp_type(cmd));
317 break;
318 }
319
320 /* Set command index */
321 cmd_reg |= cmd->opcode;
322
323 /* Enable EDMA transfer triggers */
324 if (host->do_dma)
325 cmd_reg |= MMCCMD_DMATRIG;
326
327 if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
328 host->data_dir == DAVINCI_MMC_DATADIR_READ)
329 cmd_reg |= MMCCMD_DMATRIG;
330
331 /* Setting whether command involves data transfer or not */
332 if (cmd->data)
333 cmd_reg |= MMCCMD_WDATX;
334
335 /* Setting whether data read or write */
336 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
337 cmd_reg |= MMCCMD_DTRW;
338
339 if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
340 cmd_reg |= MMCCMD_PPLEN;
341
342 /* set Command timeout */
343 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
344
345 /* Enable interrupt (calculate here, defer until FIFO is stuffed). */
346 im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
347 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
348 im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
349
350 if (!host->do_dma)
351 im_val |= MMCST0_DXRDY;
352 } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
353 im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
354
355 if (!host->do_dma)
356 im_val |= MMCST0_DRRDY;
357 }
358
359 /*
360 * Before non-DMA WRITE commands the controller needs priming:
361 * FIFO should be populated with 32 bytes i.e. whatever is the FIFO size
362 */
363 if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE))
364 davinci_fifo_data_trans(host, rw_threshold);
365
366 writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
367 writel(cmd_reg, host->base + DAVINCI_MMCCMD);
368
369 host->active_request = true;
370
371 if (!host->do_dma && host->bytes_left <= poll_threshold) {
372 u32 count = poll_loopcount;
373
374 while (host->active_request && count--) {
375 mmc_davinci_irq(0, host);
376 cpu_relax();
377 }
378 }
379
380 if (host->active_request)
381 writel(im_val, host->base + DAVINCI_MMCIM);
382}
383
384/*----------------------------------------------------------------------*/
385
386/* DMA infrastructure */
387
388static void davinci_abort_dma(struct mmc_davinci_host *host)
389{
390 struct dma_chan *sync_dev;
391
392 if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
393 sync_dev = host->dma_rx;
394 else
395 sync_dev = host->dma_tx;
396
397 dmaengine_terminate_all(sync_dev);
398}
399
400static int mmc_davinci_send_dma_request(struct mmc_davinci_host *host,
401 struct mmc_data *data)
402{
403 struct dma_chan *chan;
404 struct dma_async_tx_descriptor *desc;
405 int ret = 0;
406
407 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
408 struct dma_slave_config dma_tx_conf = {
409 .direction = DMA_MEM_TO_DEV,
410 .dst_addr = host->mem_res->start + DAVINCI_MMCDXR,
411 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
412 .dst_maxburst =
413 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
414 };
415 chan = host->dma_tx;
416 dmaengine_slave_config(host->dma_tx, &dma_tx_conf);
417
418 desc = dmaengine_prep_slave_sg(host->dma_tx,
419 data->sg,
420 host->sg_len,
421 DMA_MEM_TO_DEV,
422 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
423 if (!desc) {
424 dev_dbg(mmc_dev(host->mmc),
425 "failed to allocate DMA TX descriptor");
426 ret = -1;
427 goto out;
428 }
429 } else {
430 struct dma_slave_config dma_rx_conf = {
431 .direction = DMA_DEV_TO_MEM,
432 .src_addr = host->mem_res->start + DAVINCI_MMCDRR,
433 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
434 .src_maxburst =
435 rw_threshold / DMA_SLAVE_BUSWIDTH_4_BYTES,
436 };
437 chan = host->dma_rx;
438 dmaengine_slave_config(host->dma_rx, &dma_rx_conf);
439
440 desc = dmaengine_prep_slave_sg(host->dma_rx,
441 data->sg,
442 host->sg_len,
443 DMA_DEV_TO_MEM,
444 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
445 if (!desc) {
446 dev_dbg(mmc_dev(host->mmc),
447 "failed to allocate DMA RX descriptor");
448 ret = -1;
449 goto out;
450 }
451 }
452
453 dmaengine_submit(desc);
454 dma_async_issue_pending(chan);
455
456out:
457 return ret;
458}
459
460static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host,
461 struct mmc_data *data)
462{
463 int i;
464 int mask = rw_threshold - 1;
465 int ret = 0;
466
467 host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
468 mmc_get_dma_dir(data));
469
470 /* no individual DMA segment should need a partial FIFO */
471 for (i = 0; i < host->sg_len; i++) {
472 if (sg_dma_len(data->sg + i) & mask) {
473 dma_unmap_sg(mmc_dev(host->mmc),
474 data->sg, data->sg_len,
475 mmc_get_dma_dir(data));
476 return -1;
477 }
478 }
479
480 host->do_dma = 1;
481 ret = mmc_davinci_send_dma_request(host, data);
482
483 return ret;
484}
485
486static void davinci_release_dma_channels(struct mmc_davinci_host *host)
487{
488 if (!host->use_dma)
489 return;
490
491 dma_release_channel(host->dma_tx);
492 dma_release_channel(host->dma_rx);
493}
494
495static int davinci_acquire_dma_channels(struct mmc_davinci_host *host)
496{
497 host->dma_tx = dma_request_chan(mmc_dev(host->mmc), "tx");
498 if (IS_ERR(host->dma_tx)) {
499 dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n");
500 return PTR_ERR(host->dma_tx);
501 }
502
503 host->dma_rx = dma_request_chan(mmc_dev(host->mmc), "rx");
504 if (IS_ERR(host->dma_rx)) {
505 dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n");
506 dma_release_channel(host->dma_tx);
507 return PTR_ERR(host->dma_rx);
508 }
509
510 return 0;
511}
512
513/*----------------------------------------------------------------------*/
514
515static void
516mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req)
517{
518 int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
519 int timeout;
520 struct mmc_data *data = req->data;
521
522 if (host->version == MMC_CTLR_VERSION_2)
523 fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
524
525 host->data = data;
526 if (data == NULL) {
527 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
528 writel(0, host->base + DAVINCI_MMCBLEN);
529 writel(0, host->base + DAVINCI_MMCNBLK);
530 return;
531 }
532
533 dev_dbg(mmc_dev(host->mmc), "%s, %d blocks of %d bytes\n",
534 (data->flags & MMC_DATA_WRITE) ? "write" : "read",
535 data->blocks, data->blksz);
536 dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n",
537 data->timeout_clks, data->timeout_ns);
538 timeout = data->timeout_clks +
539 (data->timeout_ns / host->ns_in_one_cycle);
540 if (timeout > 0xffff)
541 timeout = 0xffff;
542
543 writel(timeout, host->base + DAVINCI_MMCTOD);
544 writel(data->blocks, host->base + DAVINCI_MMCNBLK);
545 writel(data->blksz, host->base + DAVINCI_MMCBLEN);
546
547 /* Configure the FIFO */
548 if (data->flags & MMC_DATA_WRITE) {
549 host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
550 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST,
551 host->base + DAVINCI_MMCFIFOCTL);
552 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
553 host->base + DAVINCI_MMCFIFOCTL);
554 } else {
555 host->data_dir = DAVINCI_MMC_DATADIR_READ;
556 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST,
557 host->base + DAVINCI_MMCFIFOCTL);
558 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
559 host->base + DAVINCI_MMCFIFOCTL);
560 }
561
562 host->buffer = NULL;
563 host->bytes_left = data->blocks * data->blksz;
564
565 /* For now we try to use DMA whenever we won't need partial FIFO
566 * reads or writes, either for the whole transfer (as tested here)
567 * or for any individual scatterlist segment (tested when we call
568 * start_dma_transfer).
569 *
570 * While we *could* change that, unusual block sizes are rarely
571 * used. The occasional fallback to PIO should't hurt.
572 */
573 if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
574 && mmc_davinci_start_dma_transfer(host, data) == 0) {
575 /* zero this to ensure we take no PIO paths */
576 host->bytes_left = 0;
577 } else {
578 /* Revert to CPU Copy */
579 host->sg_len = data->sg_len;
580 host->sg = host->data->sg;
581 mmc_davinci_sg_to_buf(host);
582 }
583}
584
585static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req)
586{
587 struct mmc_davinci_host *host = mmc_priv(mmc);
588 unsigned long timeout = jiffies + msecs_to_jiffies(900);
589 u32 mmcst1 = 0;
590
591 /* Card may still be sending BUSY after a previous operation,
592 * typically some kind of write. If so, we can't proceed yet.
593 */
594 while (time_before(jiffies, timeout)) {
595 mmcst1 = readl(host->base + DAVINCI_MMCST1);
596 if (!(mmcst1 & MMCST1_BUSY))
597 break;
598 cpu_relax();
599 }
600 if (mmcst1 & MMCST1_BUSY) {
601 dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
602 req->cmd->error = -ETIMEDOUT;
603 mmc_request_done(mmc, req);
604 return;
605 }
606
607 host->do_dma = 0;
608 mmc_davinci_prepare_data(host, req);
609 mmc_davinci_start_command(host, req->cmd);
610}
611
612static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host,
613 unsigned int mmc_req_freq)
614{
615 unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0;
616
617 mmc_pclk = host->mmc_input_clk;
618 if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
619 mmc_push_pull_divisor = ((unsigned int)mmc_pclk
620 / (2 * mmc_req_freq)) - 1;
621 else
622 mmc_push_pull_divisor = 0;
623
624 mmc_freq = (unsigned int)mmc_pclk
625 / (2 * (mmc_push_pull_divisor + 1));
626
627 if (mmc_freq > mmc_req_freq)
628 mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
629 /* Convert ns to clock cycles */
630 if (mmc_req_freq <= 400000)
631 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
632 / (2 * (mmc_push_pull_divisor + 1)))/1000));
633 else
634 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
635 / (2 * (mmc_push_pull_divisor + 1)))/1000000));
636
637 return mmc_push_pull_divisor;
638}
639
640static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
641{
642 unsigned int open_drain_freq = 0, mmc_pclk = 0;
643 unsigned int mmc_push_pull_freq = 0;
644 struct mmc_davinci_host *host = mmc_priv(mmc);
645
646 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
647 u32 temp;
648
649 /* Ignoring the init clock value passed for fixing the inter
650 * operability with different cards.
651 */
652 open_drain_freq = ((unsigned int)mmc_pclk
653 / (2 * MMCSD_INIT_CLOCK)) - 1;
654
655 if (open_drain_freq > 0xFF)
656 open_drain_freq = 0xFF;
657
658 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
659 temp |= open_drain_freq;
660 writel(temp, host->base + DAVINCI_MMCCLK);
661
662 /* Convert ns to clock cycles */
663 host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000);
664 } else {
665 u32 temp;
666 mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock);
667
668 if (mmc_push_pull_freq > 0xFF)
669 mmc_push_pull_freq = 0xFF;
670
671 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
672 writel(temp, host->base + DAVINCI_MMCCLK);
673
674 udelay(10);
675
676 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
677 temp |= mmc_push_pull_freq;
678 writel(temp, host->base + DAVINCI_MMCCLK);
679
680 writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
681
682 udelay(10);
683 }
684}
685
686static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
687{
688 struct mmc_davinci_host *host = mmc_priv(mmc);
689 struct platform_device *pdev = to_platform_device(mmc->parent);
690 struct davinci_mmc_config *config = pdev->dev.platform_data;
691
692 dev_dbg(mmc_dev(host->mmc),
693 "clock %dHz busmode %d powermode %d Vdd %04x\n",
694 ios->clock, ios->bus_mode, ios->power_mode,
695 ios->vdd);
696
697 switch (ios->power_mode) {
698 case MMC_POWER_OFF:
699 if (config && config->set_power)
700 config->set_power(pdev->id, false);
701 break;
702 case MMC_POWER_UP:
703 if (config && config->set_power)
704 config->set_power(pdev->id, true);
705 break;
706 }
707
708 switch (ios->bus_width) {
709 case MMC_BUS_WIDTH_8:
710 dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");
711 writel((readl(host->base + DAVINCI_MMCCTL) &
712 ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT,
713 host->base + DAVINCI_MMCCTL);
714 break;
715 case MMC_BUS_WIDTH_4:
716 dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
717 if (host->version == MMC_CTLR_VERSION_2)
718 writel((readl(host->base + DAVINCI_MMCCTL) &
719 ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT,
720 host->base + DAVINCI_MMCCTL);
721 else
722 writel(readl(host->base + DAVINCI_MMCCTL) |
723 MMCCTL_WIDTH_4_BIT,
724 host->base + DAVINCI_MMCCTL);
725 break;
726 case MMC_BUS_WIDTH_1:
727 dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n");
728 if (host->version == MMC_CTLR_VERSION_2)
729 writel(readl(host->base + DAVINCI_MMCCTL) &
730 ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT),
731 host->base + DAVINCI_MMCCTL);
732 else
733 writel(readl(host->base + DAVINCI_MMCCTL) &
734 ~MMCCTL_WIDTH_4_BIT,
735 host->base + DAVINCI_MMCCTL);
736 break;
737 }
738
739 calculate_clk_divider(mmc, ios);
740
741 host->bus_mode = ios->bus_mode;
742 if (ios->power_mode == MMC_POWER_UP) {
743 unsigned long timeout = jiffies + msecs_to_jiffies(50);
744 bool lose = true;
745
746 /* Send clock cycles, poll completion */
747 writel(0, host->base + DAVINCI_MMCARGHL);
748 writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
749 while (time_before(jiffies, timeout)) {
750 u32 tmp = readl(host->base + DAVINCI_MMCST0);
751
752 if (tmp & MMCST0_RSPDNE) {
753 lose = false;
754 break;
755 }
756 cpu_relax();
757 }
758 if (lose)
759 dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
760 }
761
762 /* FIXME on power OFF, reset things ... */
763}
764
765static void
766mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
767{
768 host->data = NULL;
769
770 if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
771 /*
772 * SDIO Interrupt Detection work-around as suggested by
773 * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
774 * 2.1.6): Signal SDIO interrupt only if it is enabled by core
775 */
776 if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) &
777 SDIOST0_DAT1_HI)) {
778 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
779 mmc_signal_sdio_irq(host->mmc);
780 }
781 }
782
783 if (host->do_dma) {
784 davinci_abort_dma(host);
785
786 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
787 mmc_get_dma_dir(data));
788 host->do_dma = false;
789 }
790 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
791
792 if (!data->stop || (host->cmd && host->cmd->error)) {
793 mmc_request_done(host->mmc, data->mrq);
794 writel(0, host->base + DAVINCI_MMCIM);
795 host->active_request = false;
796 } else
797 mmc_davinci_start_command(host, data->stop);
798}
799
800static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
801 struct mmc_command *cmd)
802{
803 host->cmd = NULL;
804
805 if (cmd->flags & MMC_RSP_PRESENT) {
806 if (cmd->flags & MMC_RSP_136) {
807 /* response type 2 */
808 cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
809 cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
810 cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
811 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
812 } else {
813 /* response types 1, 1b, 3, 4, 5, 6 */
814 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
815 }
816 }
817
818 if (host->data == NULL || cmd->error) {
819 if (cmd->error == -ETIMEDOUT)
820 cmd->mrq->cmd->retries = 0;
821 mmc_request_done(host->mmc, cmd->mrq);
822 writel(0, host->base + DAVINCI_MMCIM);
823 host->active_request = false;
824 }
825}
826
827static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
828 int val)
829{
830 u32 temp;
831
832 temp = readl(host->base + DAVINCI_MMCCTL);
833 if (val) /* reset */
834 temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
835 else /* enable */
836 temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
837
838 writel(temp, host->base + DAVINCI_MMCCTL);
839 udelay(10);
840}
841
842static void
843davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
844{
845 mmc_davinci_reset_ctrl(host, 1);
846 mmc_davinci_reset_ctrl(host, 0);
847}
848
849static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
850{
851 struct mmc_davinci_host *host = dev_id;
852 unsigned int status;
853
854 status = readl(host->base + DAVINCI_SDIOIST);
855 if (status & SDIOIST_IOINT) {
856 dev_dbg(mmc_dev(host->mmc),
857 "SDIO interrupt status %x\n", status);
858 writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
859 mmc_signal_sdio_irq(host->mmc);
860 }
861 return IRQ_HANDLED;
862}
863
864static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
865{
866 struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
867 unsigned int status, qstatus;
868 int end_command = 0;
869 int end_transfer = 0;
870 struct mmc_data *data = host->data;
871
872 if (host->cmd == NULL && host->data == NULL) {
873 status = readl(host->base + DAVINCI_MMCST0);
874 dev_dbg(mmc_dev(host->mmc),
875 "Spurious interrupt 0x%04x\n", status);
876 /* Disable the interrupt from mmcsd */
877 writel(0, host->base + DAVINCI_MMCIM);
878 return IRQ_NONE;
879 }
880
881 status = readl(host->base + DAVINCI_MMCST0);
882 qstatus = status;
883
884 /* handle FIFO first when using PIO for data.
885 * bytes_left will decrease to zero as I/O progress and status will
886 * read zero over iteration because this controller status
887 * register(MMCST0) reports any status only once and it is cleared
888 * by read. So, it is not unbouned loop even in the case of
889 * non-dma.
890 */
891 if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
892 unsigned long im_val;
893
894 /*
895 * If interrupts fire during the following loop, they will be
896 * handled by the handler, but the PIC will still buffer these.
897 * As a result, the handler will be called again to serve these
898 * needlessly. In order to avoid these spurious interrupts,
899 * keep interrupts masked during the loop.
900 */
901 im_val = readl(host->base + DAVINCI_MMCIM);
902 writel(0, host->base + DAVINCI_MMCIM);
903
904 do {
905 davinci_fifo_data_trans(host, rw_threshold);
906 status = readl(host->base + DAVINCI_MMCST0);
907 qstatus |= status;
908 } while (host->bytes_left &&
909 (status & (MMCST0_DXRDY | MMCST0_DRRDY)));
910
911 /*
912 * If an interrupt is pending, it is assumed it will fire when
913 * it is unmasked. This assumption is also taken when the MMCIM
914 * is first set. Otherwise, writing to MMCIM after reading the
915 * status is race-prone.
916 */
917 writel(im_val, host->base + DAVINCI_MMCIM);
918 }
919
920 if (qstatus & MMCST0_DATDNE) {
921 /* All blocks sent/received, and CRC checks passed */
922 if (data != NULL) {
923 if ((host->do_dma == 0) && (host->bytes_left > 0)) {
924 /* if datasize < rw_threshold
925 * no RX ints are generated
926 */
927 davinci_fifo_data_trans(host, host->bytes_left);
928 }
929 end_transfer = 1;
930 data->bytes_xfered = data->blocks * data->blksz;
931 } else {
932 dev_err(mmc_dev(host->mmc),
933 "DATDNE with no host->data\n");
934 }
935 }
936
937 if (qstatus & MMCST0_TOUTRD) {
938 /* Read data timeout */
939 data->error = -ETIMEDOUT;
940 end_transfer = 1;
941
942 dev_dbg(mmc_dev(host->mmc),
943 "read data timeout, status %x\n",
944 qstatus);
945
946 davinci_abort_data(host, data);
947 }
948
949 if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
950 /* Data CRC error */
951 data->error = -EILSEQ;
952 end_transfer = 1;
953
954 /* NOTE: this controller uses CRCWR to report both CRC
955 * errors and timeouts (on writes). MMCDRSP values are
956 * only weakly documented, but 0x9f was clearly a timeout
957 * case and the two three-bit patterns in various SD specs
958 * (101, 010) aren't part of it ...
959 */
960 if (qstatus & MMCST0_CRCWR) {
961 u32 temp = readb(host->base + DAVINCI_MMCDRSP);
962
963 if (temp == 0x9f)
964 data->error = -ETIMEDOUT;
965 }
966 dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
967 (qstatus & MMCST0_CRCWR) ? "write" : "read",
968 (data->error == -ETIMEDOUT) ? "timeout" : "CRC");
969
970 davinci_abort_data(host, data);
971 }
972
973 if (qstatus & MMCST0_TOUTRS) {
974 /* Command timeout */
975 if (host->cmd) {
976 dev_dbg(mmc_dev(host->mmc),
977 "CMD%d timeout, status %x\n",
978 host->cmd->opcode, qstatus);
979 host->cmd->error = -ETIMEDOUT;
980 if (data) {
981 end_transfer = 1;
982 davinci_abort_data(host, data);
983 } else
984 end_command = 1;
985 }
986 }
987
988 if (qstatus & MMCST0_CRCRS) {
989 /* Command CRC error */
990 dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
991 if (host->cmd) {
992 host->cmd->error = -EILSEQ;
993 end_command = 1;
994 }
995 }
996
997 if (qstatus & MMCST0_RSPDNE) {
998 /* End of command phase */
999 end_command = host->cmd ? 1 : 0;
1000 }
1001
1002 if (end_command)
1003 mmc_davinci_cmd_done(host, host->cmd);
1004 if (end_transfer)
1005 mmc_davinci_xfer_done(host, data);
1006 return IRQ_HANDLED;
1007}
1008
1009static int mmc_davinci_get_cd(struct mmc_host *mmc)
1010{
1011 struct platform_device *pdev = to_platform_device(mmc->parent);
1012 struct davinci_mmc_config *config = pdev->dev.platform_data;
1013
1014 if (config && config->get_cd)
1015 return config->get_cd(pdev->id);
1016
1017 return mmc_gpio_get_cd(mmc);
1018}
1019
1020static int mmc_davinci_get_ro(struct mmc_host *mmc)
1021{
1022 struct platform_device *pdev = to_platform_device(mmc->parent);
1023 struct davinci_mmc_config *config = pdev->dev.platform_data;
1024
1025 if (config && config->get_ro)
1026 return config->get_ro(pdev->id);
1027
1028 return mmc_gpio_get_ro(mmc);
1029}
1030
1031static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1032{
1033 struct mmc_davinci_host *host = mmc_priv(mmc);
1034
1035 if (enable) {
1036 if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) {
1037 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
1038 mmc_signal_sdio_irq(host->mmc);
1039 } else {
1040 host->sdio_int = true;
1041 writel(readl(host->base + DAVINCI_SDIOIEN) |
1042 SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
1043 }
1044 } else {
1045 host->sdio_int = false;
1046 writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
1047 host->base + DAVINCI_SDIOIEN);
1048 }
1049}
1050
1051static const struct mmc_host_ops mmc_davinci_ops = {
1052 .request = mmc_davinci_request,
1053 .set_ios = mmc_davinci_set_ios,
1054 .get_cd = mmc_davinci_get_cd,
1055 .get_ro = mmc_davinci_get_ro,
1056 .enable_sdio_irq = mmc_davinci_enable_sdio_irq,
1057};
1058
1059/*----------------------------------------------------------------------*/
1060
1061#ifdef CONFIG_CPU_FREQ
1062static int mmc_davinci_cpufreq_transition(struct notifier_block *nb,
1063 unsigned long val, void *data)
1064{
1065 struct mmc_davinci_host *host;
1066 unsigned int mmc_pclk;
1067 struct mmc_host *mmc;
1068 unsigned long flags;
1069
1070 host = container_of(nb, struct mmc_davinci_host, freq_transition);
1071 mmc = host->mmc;
1072 mmc_pclk = clk_get_rate(host->clk);
1073
1074 if (val == CPUFREQ_POSTCHANGE) {
1075 spin_lock_irqsave(&mmc->lock, flags);
1076 host->mmc_input_clk = mmc_pclk;
1077 calculate_clk_divider(mmc, &mmc->ios);
1078 spin_unlock_irqrestore(&mmc->lock, flags);
1079 }
1080
1081 return 0;
1082}
1083
1084static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1085{
1086 host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition;
1087
1088 return cpufreq_register_notifier(&host->freq_transition,
1089 CPUFREQ_TRANSITION_NOTIFIER);
1090}
1091
1092static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1093{
1094 cpufreq_unregister_notifier(&host->freq_transition,
1095 CPUFREQ_TRANSITION_NOTIFIER);
1096}
1097#else
1098static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1099{
1100 return 0;
1101}
1102
1103static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1104{
1105}
1106#endif
1107static void init_mmcsd_host(struct mmc_davinci_host *host)
1108{
1109
1110 mmc_davinci_reset_ctrl(host, 1);
1111
1112 writel(0, host->base + DAVINCI_MMCCLK);
1113 writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
1114
1115 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
1116 writel(0xFFFF, host->base + DAVINCI_MMCTOD);
1117
1118 mmc_davinci_reset_ctrl(host, 0);
1119}
1120
1121static const struct platform_device_id davinci_mmc_devtype[] = {
1122 {
1123 .name = "dm6441-mmc",
1124 .driver_data = MMC_CTLR_VERSION_1,
1125 }, {
1126 .name = "da830-mmc",
1127 .driver_data = MMC_CTLR_VERSION_2,
1128 },
1129 {},
1130};
1131MODULE_DEVICE_TABLE(platform, davinci_mmc_devtype);
1132
1133static const struct of_device_id davinci_mmc_dt_ids[] = {
1134 {
1135 .compatible = "ti,dm6441-mmc",
1136 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_1],
1137 },
1138 {
1139 .compatible = "ti,da830-mmc",
1140 .data = &davinci_mmc_devtype[MMC_CTLR_VERSION_2],
1141 },
1142 {},
1143};
1144MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
1145
1146static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
1147{
1148 struct platform_device *pdev = to_platform_device(mmc->parent);
1149 struct davinci_mmc_config *pdata = pdev->dev.platform_data;
1150 struct mmc_davinci_host *host;
1151 int ret;
1152
1153 if (!pdata)
1154 return -EINVAL;
1155
1156 host = mmc_priv(mmc);
1157 if (!host)
1158 return -EINVAL;
1159
1160 if (pdata && pdata->nr_sg)
1161 host->nr_sg = pdata->nr_sg - 1;
1162
1163 if (pdata && (pdata->wires == 4 || pdata->wires == 0))
1164 mmc->caps |= MMC_CAP_4_BIT_DATA;
1165
1166 if (pdata && (pdata->wires == 8))
1167 mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
1168
1169 mmc->f_min = 312500;
1170 mmc->f_max = 25000000;
1171 if (pdata && pdata->max_freq)
1172 mmc->f_max = pdata->max_freq;
1173 if (pdata && pdata->caps)
1174 mmc->caps |= pdata->caps;
1175
1176 /* Register a cd gpio, if there is not one, enable polling */
1177 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
1178 if (ret == -EPROBE_DEFER)
1179 return ret;
1180 else if (ret)
1181 mmc->caps |= MMC_CAP_NEEDS_POLL;
1182
1183 ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
1184 if (ret == -EPROBE_DEFER)
1185 return ret;
1186
1187 return 0;
1188}
1189
1190static int davinci_mmcsd_probe(struct platform_device *pdev)
1191{
1192 struct mmc_davinci_host *host = NULL;
1193 struct mmc_host *mmc = NULL;
1194 struct resource *r, *mem = NULL;
1195 int ret, irq;
1196 size_t mem_size;
1197 const struct platform_device_id *id_entry;
1198
1199 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1200 if (!r)
1201 return -ENODEV;
1202 irq = platform_get_irq(pdev, 0);
1203 if (irq < 0)
1204 return irq;
1205
1206 mem_size = resource_size(r);
1207 mem = devm_request_mem_region(&pdev->dev, r->start, mem_size,
1208 pdev->name);
1209 if (!mem)
1210 return -EBUSY;
1211
1212 mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
1213 if (!mmc)
1214 return -ENOMEM;
1215
1216 host = mmc_priv(mmc);
1217 host->mmc = mmc; /* Important */
1218
1219 host->mem_res = mem;
1220 host->base = devm_ioremap(&pdev->dev, mem->start, mem_size);
1221 if (!host->base) {
1222 ret = -ENOMEM;
1223 goto ioremap_fail;
1224 }
1225
1226 host->clk = devm_clk_get(&pdev->dev, NULL);
1227 if (IS_ERR(host->clk)) {
1228 ret = PTR_ERR(host->clk);
1229 goto clk_get_fail;
1230 }
1231 ret = clk_prepare_enable(host->clk);
1232 if (ret)
1233 goto clk_prepare_enable_fail;
1234
1235 host->mmc_input_clk = clk_get_rate(host->clk);
1236
1237 pdev->id_entry = of_device_get_match_data(&pdev->dev);
1238 if (pdev->id_entry) {
1239 ret = mmc_of_parse(mmc);
1240 if (ret) {
1241 dev_err_probe(&pdev->dev, ret,
1242 "could not parse of data\n");
1243 goto parse_fail;
1244 }
1245 } else {
1246 ret = mmc_davinci_parse_pdata(mmc);
1247 if (ret) {
1248 dev_err(&pdev->dev,
1249 "could not parse platform data: %d\n", ret);
1250 goto parse_fail;
1251 } }
1252
1253 if (host->nr_sg > MAX_NR_SG || !host->nr_sg)
1254 host->nr_sg = MAX_NR_SG;
1255
1256 init_mmcsd_host(host);
1257
1258 host->use_dma = use_dma;
1259 host->mmc_irq = irq;
1260 host->sdio_irq = platform_get_irq(pdev, 1);
1261
1262 if (host->use_dma) {
1263 ret = davinci_acquire_dma_channels(host);
1264 if (ret == -EPROBE_DEFER)
1265 goto dma_probe_defer;
1266 else if (ret)
1267 host->use_dma = 0;
1268 }
1269
1270 mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
1271
1272 id_entry = platform_get_device_id(pdev);
1273 if (id_entry)
1274 host->version = id_entry->driver_data;
1275
1276 mmc->ops = &mmc_davinci_ops;
1277 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1278
1279 /* With no iommu coalescing pages, each phys_seg is a hw_seg.
1280 * Each hw_seg uses one EDMA parameter RAM slot, always one
1281 * channel and then usually some linked slots.
1282 */
1283 mmc->max_segs = MAX_NR_SG;
1284
1285 /* EDMA limit per hw segment (one or two MBytes) */
1286 mmc->max_seg_size = MAX_CCNT * rw_threshold;
1287
1288 /* MMC/SD controller limits for multiblock requests */
1289 mmc->max_blk_size = 4095; /* BLEN is 12 bits */
1290 mmc->max_blk_count = 65535; /* NBLK is 16 bits */
1291 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1292
1293 dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
1294 dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size);
1295 dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size);
1296 dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size);
1297
1298 platform_set_drvdata(pdev, host);
1299
1300 ret = mmc_davinci_cpufreq_register(host);
1301 if (ret) {
1302 dev_err(&pdev->dev, "failed to register cpufreq\n");
1303 goto cpu_freq_fail;
1304 }
1305
1306 ret = mmc_add_host(mmc);
1307 if (ret < 0)
1308 goto mmc_add_host_fail;
1309
1310 ret = devm_request_irq(&pdev->dev, irq, mmc_davinci_irq, 0,
1311 mmc_hostname(mmc), host);
1312 if (ret)
1313 goto request_irq_fail;
1314
1315 if (host->sdio_irq >= 0) {
1316 ret = devm_request_irq(&pdev->dev, host->sdio_irq,
1317 mmc_davinci_sdio_irq, 0,
1318 mmc_hostname(mmc), host);
1319 if (!ret)
1320 mmc->caps |= MMC_CAP_SDIO_IRQ;
1321 }
1322
1323 rename_region(mem, mmc_hostname(mmc));
1324
1325 dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
1326 host->use_dma ? "DMA" : "PIO",
1327 (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
1328
1329 return 0;
1330
1331request_irq_fail:
1332 mmc_remove_host(mmc);
1333mmc_add_host_fail:
1334 mmc_davinci_cpufreq_deregister(host);
1335cpu_freq_fail:
1336 davinci_release_dma_channels(host);
1337parse_fail:
1338dma_probe_defer:
1339 clk_disable_unprepare(host->clk);
1340clk_prepare_enable_fail:
1341clk_get_fail:
1342ioremap_fail:
1343 mmc_free_host(mmc);
1344
1345 return ret;
1346}
1347
1348static int __exit 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 return 0;
1359}
1360
1361#ifdef CONFIG_PM
1362static int davinci_mmcsd_suspend(struct device *dev)
1363{
1364 struct mmc_davinci_host *host = dev_get_drvdata(dev);
1365
1366 writel(0, host->base + DAVINCI_MMCIM);
1367 mmc_davinci_reset_ctrl(host, 1);
1368 clk_disable(host->clk);
1369
1370 return 0;
1371}
1372
1373static int davinci_mmcsd_resume(struct device *dev)
1374{
1375 struct mmc_davinci_host *host = dev_get_drvdata(dev);
1376 int ret;
1377
1378 ret = clk_enable(host->clk);
1379 if (ret)
1380 return ret;
1381
1382 mmc_davinci_reset_ctrl(host, 0);
1383
1384 return 0;
1385}
1386
1387static const struct dev_pm_ops davinci_mmcsd_pm = {
1388 .suspend = davinci_mmcsd_suspend,
1389 .resume = davinci_mmcsd_resume,
1390};
1391
1392#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
1393#else
1394#define davinci_mmcsd_pm_ops NULL
1395#endif
1396
1397static struct platform_driver davinci_mmcsd_driver = {
1398 .driver = {
1399 .name = "davinci_mmc",
1400 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1401 .pm = davinci_mmcsd_pm_ops,
1402 .of_match_table = davinci_mmc_dt_ids,
1403 },
1404 .probe = davinci_mmcsd_probe,
1405 .remove = __exit_p(davinci_mmcsd_remove),
1406 .id_table = davinci_mmc_devtype,
1407};
1408
1409module_platform_driver(davinci_mmcsd_driver);
1410
1411MODULE_AUTHOR("Texas Instruments India");
1412MODULE_LICENSE("GPL");
1413MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
1414MODULE_ALIAS("platform:davinci_mmc");
1415
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
158static unsigned rw_threshold = 32;
159module_param(rw_threshold, uint, S_IRUGO);
160MODULE_PARM_DESC(rw_threshold,
161 "Read/Write threshold. Default = 32");
162
163static unsigned poll_threshold = 128;
164module_param(poll_threshold, uint, S_IRUGO);
165MODULE_PARM_DESC(poll_threshold,
166 "Polling transaction size threshold. Default = 128");
167
168static unsigned poll_loopcount = 32;
169module_param(poll_loopcount, uint, S_IRUGO);
170MODULE_PARM_DESC(poll_loopcount,
171 "Maximum polling loop count. Default = 32");
172
173static unsigned __initdata use_dma = 1;
174module_param(use_dma, uint, 0);
175MODULE_PARM_DESC(use_dma, "Whether to use DMA or not. Default = 1");
176
177struct mmc_davinci_host {
178 struct mmc_command *cmd;
179 struct mmc_data *data;
180 struct mmc_host *mmc;
181 struct clk *clk;
182 unsigned int mmc_input_clk;
183 void __iomem *base;
184 struct resource *mem_res;
185 int mmc_irq, sdio_irq;
186 unsigned char bus_mode;
187
188#define DAVINCI_MMC_DATADIR_NONE 0
189#define DAVINCI_MMC_DATADIR_READ 1
190#define DAVINCI_MMC_DATADIR_WRITE 2
191 unsigned char data_dir;
192 unsigned char suspended;
193
194 /* buffer is used during PIO of one scatterlist segment, and
195 * is updated along with buffer_bytes_left. bytes_left applies
196 * to all N blocks of the PIO transfer.
197 */
198 u8 *buffer;
199 u32 buffer_bytes_left;
200 u32 bytes_left;
201
202 u32 rxdma, txdma;
203 bool use_dma;
204 bool do_dma;
205 bool sdio_int;
206 bool active_request;
207
208 /* Scatterlist DMA uses one or more parameter RAM entries:
209 * the main one (associated with rxdma or txdma) plus zero or
210 * more links. The entries for a given transfer differ only
211 * by memory buffer (address, length) and link field.
212 */
213 struct edmacc_param tx_template;
214 struct edmacc_param rx_template;
215 unsigned n_link;
216 u32 links[MAX_NR_SG - 1];
217
218 /* For PIO we walk scatterlists one segment at a time. */
219 unsigned int sg_len;
220 struct scatterlist *sg;
221
222 /* Version of the MMC/SD controller */
223 u8 version;
224 /* for ns in one cycle calculation */
225 unsigned ns_in_one_cycle;
226 /* Number of sg segments */
227 u8 nr_sg;
228#ifdef CONFIG_CPU_FREQ
229 struct notifier_block freq_transition;
230#endif
231};
232
233static irqreturn_t mmc_davinci_irq(int irq, void *dev_id);
234
235/* PIO only */
236static void mmc_davinci_sg_to_buf(struct mmc_davinci_host *host)
237{
238 host->buffer_bytes_left = sg_dma_len(host->sg);
239 host->buffer = sg_virt(host->sg);
240 if (host->buffer_bytes_left > host->bytes_left)
241 host->buffer_bytes_left = host->bytes_left;
242}
243
244static void davinci_fifo_data_trans(struct mmc_davinci_host *host,
245 unsigned int n)
246{
247 u8 *p;
248 unsigned int i;
249
250 if (host->buffer_bytes_left == 0) {
251 host->sg = sg_next(host->data->sg);
252 mmc_davinci_sg_to_buf(host);
253 }
254
255 p = host->buffer;
256 if (n > host->buffer_bytes_left)
257 n = host->buffer_bytes_left;
258 host->buffer_bytes_left -= n;
259 host->bytes_left -= n;
260
261 /* NOTE: we never transfer more than rw_threshold bytes
262 * to/from the fifo here; there's no I/O overlap.
263 * This also assumes that access width( i.e. ACCWD) is 4 bytes
264 */
265 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
266 for (i = 0; i < (n >> 2); i++) {
267 writel(*((u32 *)p), host->base + DAVINCI_MMCDXR);
268 p = p + 4;
269 }
270 if (n & 3) {
271 iowrite8_rep(host->base + DAVINCI_MMCDXR, p, (n & 3));
272 p = p + (n & 3);
273 }
274 } else {
275 for (i = 0; i < (n >> 2); i++) {
276 *((u32 *)p) = readl(host->base + DAVINCI_MMCDRR);
277 p = p + 4;
278 }
279 if (n & 3) {
280 ioread8_rep(host->base + DAVINCI_MMCDRR, p, (n & 3));
281 p = p + (n & 3);
282 }
283 }
284 host->buffer = p;
285}
286
287static void mmc_davinci_start_command(struct mmc_davinci_host *host,
288 struct mmc_command *cmd)
289{
290 u32 cmd_reg = 0;
291 u32 im_val;
292
293 dev_dbg(mmc_dev(host->mmc), "CMD%d, arg 0x%08x%s\n",
294 cmd->opcode, cmd->arg,
295 ({ char *s;
296 switch (mmc_resp_type(cmd)) {
297 case MMC_RSP_R1:
298 s = ", R1/R5/R6/R7 response";
299 break;
300 case MMC_RSP_R1B:
301 s = ", R1b response";
302 break;
303 case MMC_RSP_R2:
304 s = ", R2 response";
305 break;
306 case MMC_RSP_R3:
307 s = ", R3/R4 response";
308 break;
309 default:
310 s = ", (R? response)";
311 break;
312 }; s; }));
313 host->cmd = cmd;
314
315 switch (mmc_resp_type(cmd)) {
316 case MMC_RSP_R1B:
317 /* There's some spec confusion about when R1B is
318 * allowed, but if the card doesn't issue a BUSY
319 * then it's harmless for us to allow it.
320 */
321 cmd_reg |= MMCCMD_BSYEXP;
322 /* FALLTHROUGH */
323 case MMC_RSP_R1: /* 48 bits, CRC */
324 cmd_reg |= MMCCMD_RSPFMT_R1456;
325 break;
326 case MMC_RSP_R2: /* 136 bits, CRC */
327 cmd_reg |= MMCCMD_RSPFMT_R2;
328 break;
329 case MMC_RSP_R3: /* 48 bits, no CRC */
330 cmd_reg |= MMCCMD_RSPFMT_R3;
331 break;
332 default:
333 cmd_reg |= MMCCMD_RSPFMT_NONE;
334 dev_dbg(mmc_dev(host->mmc), "unknown resp_type %04x\n",
335 mmc_resp_type(cmd));
336 break;
337 }
338
339 /* Set command index */
340 cmd_reg |= cmd->opcode;
341
342 /* Enable EDMA transfer triggers */
343 if (host->do_dma)
344 cmd_reg |= MMCCMD_DMATRIG;
345
346 if (host->version == MMC_CTLR_VERSION_2 && host->data != NULL &&
347 host->data_dir == DAVINCI_MMC_DATADIR_READ)
348 cmd_reg |= MMCCMD_DMATRIG;
349
350 /* Setting whether command involves data transfer or not */
351 if (cmd->data)
352 cmd_reg |= MMCCMD_WDATX;
353
354 /* Setting whether stream or block transfer */
355 if (cmd->flags & MMC_DATA_STREAM)
356 cmd_reg |= MMCCMD_STRMTP;
357
358 /* Setting whether data read or write */
359 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
360 cmd_reg |= MMCCMD_DTRW;
361
362 if (host->bus_mode == MMC_BUSMODE_PUSHPULL)
363 cmd_reg |= MMCCMD_PPLEN;
364
365 /* set Command timeout */
366 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
367
368 /* Enable interrupt (calculate here, defer until FIFO is stuffed). */
369 im_val = MMCST0_RSPDNE | MMCST0_CRCRS | MMCST0_TOUTRS;
370 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
371 im_val |= MMCST0_DATDNE | MMCST0_CRCWR;
372
373 if (!host->do_dma)
374 im_val |= MMCST0_DXRDY;
375 } else if (host->data_dir == DAVINCI_MMC_DATADIR_READ) {
376 im_val |= MMCST0_DATDNE | MMCST0_CRCRD | MMCST0_TOUTRD;
377
378 if (!host->do_dma)
379 im_val |= MMCST0_DRRDY;
380 }
381
382 /*
383 * Before non-DMA WRITE commands the controller needs priming:
384 * FIFO should be populated with 32 bytes i.e. whatever is the FIFO size
385 */
386 if (!host->do_dma && (host->data_dir == DAVINCI_MMC_DATADIR_WRITE))
387 davinci_fifo_data_trans(host, rw_threshold);
388
389 writel(cmd->arg, host->base + DAVINCI_MMCARGHL);
390 writel(cmd_reg, host->base + DAVINCI_MMCCMD);
391
392 host->active_request = true;
393
394 if (!host->do_dma && host->bytes_left <= poll_threshold) {
395 u32 count = poll_loopcount;
396
397 while (host->active_request && count--) {
398 mmc_davinci_irq(0, host);
399 cpu_relax();
400 }
401 }
402
403 if (host->active_request)
404 writel(im_val, host->base + DAVINCI_MMCIM);
405}
406
407/*----------------------------------------------------------------------*/
408
409/* DMA infrastructure */
410
411static void davinci_abort_dma(struct mmc_davinci_host *host)
412{
413 int sync_dev;
414
415 if (host->data_dir == DAVINCI_MMC_DATADIR_READ)
416 sync_dev = host->rxdma;
417 else
418 sync_dev = host->txdma;
419
420 edma_stop(sync_dev);
421 edma_clean_channel(sync_dev);
422}
423
424static void
425mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data);
426
427static void mmc_davinci_dma_cb(unsigned channel, u16 ch_status, void *data)
428{
429 if (DMA_COMPLETE != ch_status) {
430 struct mmc_davinci_host *host = data;
431
432 /* Currently means: DMA Event Missed, or "null" transfer
433 * request was seen. In the future, TC errors (like bad
434 * addresses) might be presented too.
435 */
436 dev_warn(mmc_dev(host->mmc), "DMA %s error\n",
437 (host->data->flags & MMC_DATA_WRITE)
438 ? "write" : "read");
439 host->data->error = -EIO;
440 mmc_davinci_xfer_done(host, host->data);
441 }
442}
443
444/* Set up tx or rx template, to be modified and updated later */
445static void __init mmc_davinci_dma_setup(struct mmc_davinci_host *host,
446 bool tx, struct edmacc_param *template)
447{
448 unsigned sync_dev;
449 const u16 acnt = 4;
450 const u16 bcnt = rw_threshold >> 2;
451 const u16 ccnt = 0;
452 u32 src_port = 0;
453 u32 dst_port = 0;
454 s16 src_bidx, dst_bidx;
455 s16 src_cidx, dst_cidx;
456
457 /*
458 * A-B Sync transfer: each DMA request is for one "frame" of
459 * rw_threshold bytes, broken into "acnt"-size chunks repeated
460 * "bcnt" times. Each segment needs "ccnt" such frames; since
461 * we tell the block layer our mmc->max_seg_size limit, we can
462 * trust (later) that it's within bounds.
463 *
464 * The FIFOs are read/written in 4-byte chunks (acnt == 4) and
465 * EDMA will optimize memory operations to use larger bursts.
466 */
467 if (tx) {
468 sync_dev = host->txdma;
469
470 /* src_prt, ccnt, and link to be set up later */
471 src_bidx = acnt;
472 src_cidx = acnt * bcnt;
473
474 dst_port = host->mem_res->start + DAVINCI_MMCDXR;
475 dst_bidx = 0;
476 dst_cidx = 0;
477 } else {
478 sync_dev = host->rxdma;
479
480 src_port = host->mem_res->start + DAVINCI_MMCDRR;
481 src_bidx = 0;
482 src_cidx = 0;
483
484 /* dst_prt, ccnt, and link to be set up later */
485 dst_bidx = acnt;
486 dst_cidx = acnt * bcnt;
487 }
488
489 /*
490 * We can't use FIFO mode for the FIFOs because MMC FIFO addresses
491 * are not 256-bit (32-byte) aligned. So we use INCR, and the W8BIT
492 * parameter is ignored.
493 */
494 edma_set_src(sync_dev, src_port, INCR, W8BIT);
495 edma_set_dest(sync_dev, dst_port, INCR, W8BIT);
496
497 edma_set_src_index(sync_dev, src_bidx, src_cidx);
498 edma_set_dest_index(sync_dev, dst_bidx, dst_cidx);
499
500 edma_set_transfer_params(sync_dev, acnt, bcnt, ccnt, 8, ABSYNC);
501
502 edma_read_slot(sync_dev, template);
503
504 /* don't bother with irqs or chaining */
505 template->opt |= EDMA_CHAN_SLOT(sync_dev) << 12;
506}
507
508static void mmc_davinci_send_dma_request(struct mmc_davinci_host *host,
509 struct mmc_data *data)
510{
511 struct edmacc_param *template;
512 int channel, slot;
513 unsigned link;
514 struct scatterlist *sg;
515 unsigned sg_len;
516 unsigned bytes_left = host->bytes_left;
517 const unsigned shift = ffs(rw_threshold) - 1;
518
519 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE) {
520 template = &host->tx_template;
521 channel = host->txdma;
522 } else {
523 template = &host->rx_template;
524 channel = host->rxdma;
525 }
526
527 /* We know sg_len and ccnt will never be out of range because
528 * we told the mmc layer which in turn tells the block layer
529 * to ensure that it only hands us one scatterlist segment
530 * per EDMA PARAM entry. Update the PARAM
531 * entries needed for each segment of this scatterlist.
532 */
533 for (slot = channel, link = 0, sg = data->sg, sg_len = host->sg_len;
534 sg_len-- != 0 && bytes_left;
535 sg = sg_next(sg), slot = host->links[link++]) {
536 u32 buf = sg_dma_address(sg);
537 unsigned count = sg_dma_len(sg);
538
539 template->link_bcntrld = sg_len
540 ? (EDMA_CHAN_SLOT(host->links[link]) << 5)
541 : 0xffff;
542
543 if (count > bytes_left)
544 count = bytes_left;
545 bytes_left -= count;
546
547 if (host->data_dir == DAVINCI_MMC_DATADIR_WRITE)
548 template->src = buf;
549 else
550 template->dst = buf;
551 template->ccnt = count >> shift;
552
553 edma_write_slot(slot, template);
554 }
555
556 if (host->version == MMC_CTLR_VERSION_2)
557 edma_clear_event(channel);
558
559 edma_start(channel);
560}
561
562static int mmc_davinci_start_dma_transfer(struct mmc_davinci_host *host,
563 struct mmc_data *data)
564{
565 int i;
566 int mask = rw_threshold - 1;
567
568 host->sg_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
569 ((data->flags & MMC_DATA_WRITE)
570 ? DMA_TO_DEVICE
571 : DMA_FROM_DEVICE));
572
573 /* no individual DMA segment should need a partial FIFO */
574 for (i = 0; i < host->sg_len; i++) {
575 if (sg_dma_len(data->sg + i) & mask) {
576 dma_unmap_sg(mmc_dev(host->mmc),
577 data->sg, data->sg_len,
578 (data->flags & MMC_DATA_WRITE)
579 ? DMA_TO_DEVICE
580 : DMA_FROM_DEVICE);
581 return -1;
582 }
583 }
584
585 host->do_dma = 1;
586 mmc_davinci_send_dma_request(host, data);
587
588 return 0;
589}
590
591static void __init_or_module
592davinci_release_dma_channels(struct mmc_davinci_host *host)
593{
594 unsigned i;
595
596 if (!host->use_dma)
597 return;
598
599 for (i = 0; i < host->n_link; i++)
600 edma_free_slot(host->links[i]);
601
602 edma_free_channel(host->txdma);
603 edma_free_channel(host->rxdma);
604}
605
606static int __init davinci_acquire_dma_channels(struct mmc_davinci_host *host)
607{
608 u32 link_size;
609 int r, i;
610
611 /* Acquire master DMA write channel */
612 r = edma_alloc_channel(host->txdma, mmc_davinci_dma_cb, host,
613 EVENTQ_DEFAULT);
614 if (r < 0) {
615 dev_warn(mmc_dev(host->mmc), "alloc %s channel err %d\n",
616 "tx", r);
617 return r;
618 }
619 mmc_davinci_dma_setup(host, true, &host->tx_template);
620
621 /* Acquire master DMA read channel */
622 r = edma_alloc_channel(host->rxdma, mmc_davinci_dma_cb, host,
623 EVENTQ_DEFAULT);
624 if (r < 0) {
625 dev_warn(mmc_dev(host->mmc), "alloc %s channel err %d\n",
626 "rx", r);
627 goto free_master_write;
628 }
629 mmc_davinci_dma_setup(host, false, &host->rx_template);
630
631 /* Allocate parameter RAM slots, which will later be bound to a
632 * channel as needed to handle a scatterlist.
633 */
634 link_size = min_t(unsigned, host->nr_sg, ARRAY_SIZE(host->links));
635 for (i = 0; i < link_size; i++) {
636 r = edma_alloc_slot(EDMA_CTLR(host->txdma), EDMA_SLOT_ANY);
637 if (r < 0) {
638 dev_dbg(mmc_dev(host->mmc), "dma PaRAM alloc --> %d\n",
639 r);
640 break;
641 }
642 host->links[i] = r;
643 }
644 host->n_link = i;
645
646 return 0;
647
648free_master_write:
649 edma_free_channel(host->txdma);
650
651 return r;
652}
653
654/*----------------------------------------------------------------------*/
655
656static void
657mmc_davinci_prepare_data(struct mmc_davinci_host *host, struct mmc_request *req)
658{
659 int fifo_lev = (rw_threshold == 32) ? MMCFIFOCTL_FIFOLEV : 0;
660 int timeout;
661 struct mmc_data *data = req->data;
662
663 if (host->version == MMC_CTLR_VERSION_2)
664 fifo_lev = (rw_threshold == 64) ? MMCFIFOCTL_FIFOLEV : 0;
665
666 host->data = data;
667 if (data == NULL) {
668 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
669 writel(0, host->base + DAVINCI_MMCBLEN);
670 writel(0, host->base + DAVINCI_MMCNBLK);
671 return;
672 }
673
674 dev_dbg(mmc_dev(host->mmc), "%s %s, %d blocks of %d bytes\n",
675 (data->flags & MMC_DATA_STREAM) ? "stream" : "block",
676 (data->flags & MMC_DATA_WRITE) ? "write" : "read",
677 data->blocks, data->blksz);
678 dev_dbg(mmc_dev(host->mmc), " DTO %d cycles + %d ns\n",
679 data->timeout_clks, data->timeout_ns);
680 timeout = data->timeout_clks +
681 (data->timeout_ns / host->ns_in_one_cycle);
682 if (timeout > 0xffff)
683 timeout = 0xffff;
684
685 writel(timeout, host->base + DAVINCI_MMCTOD);
686 writel(data->blocks, host->base + DAVINCI_MMCNBLK);
687 writel(data->blksz, host->base + DAVINCI_MMCBLEN);
688
689 /* Configure the FIFO */
690 switch (data->flags & MMC_DATA_WRITE) {
691 case MMC_DATA_WRITE:
692 host->data_dir = DAVINCI_MMC_DATADIR_WRITE;
693 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR | MMCFIFOCTL_FIFORST,
694 host->base + DAVINCI_MMCFIFOCTL);
695 writel(fifo_lev | MMCFIFOCTL_FIFODIR_WR,
696 host->base + DAVINCI_MMCFIFOCTL);
697 break;
698
699 default:
700 host->data_dir = DAVINCI_MMC_DATADIR_READ;
701 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD | MMCFIFOCTL_FIFORST,
702 host->base + DAVINCI_MMCFIFOCTL);
703 writel(fifo_lev | MMCFIFOCTL_FIFODIR_RD,
704 host->base + DAVINCI_MMCFIFOCTL);
705 break;
706 }
707
708 host->buffer = NULL;
709 host->bytes_left = data->blocks * data->blksz;
710
711 /* For now we try to use DMA whenever we won't need partial FIFO
712 * reads or writes, either for the whole transfer (as tested here)
713 * or for any individual scatterlist segment (tested when we call
714 * start_dma_transfer).
715 *
716 * While we *could* change that, unusual block sizes are rarely
717 * used. The occasional fallback to PIO should't hurt.
718 */
719 if (host->use_dma && (host->bytes_left & (rw_threshold - 1)) == 0
720 && mmc_davinci_start_dma_transfer(host, data) == 0) {
721 /* zero this to ensure we take no PIO paths */
722 host->bytes_left = 0;
723 } else {
724 /* Revert to CPU Copy */
725 host->sg_len = data->sg_len;
726 host->sg = host->data->sg;
727 mmc_davinci_sg_to_buf(host);
728 }
729}
730
731static void mmc_davinci_request(struct mmc_host *mmc, struct mmc_request *req)
732{
733 struct mmc_davinci_host *host = mmc_priv(mmc);
734 unsigned long timeout = jiffies + msecs_to_jiffies(900);
735 u32 mmcst1 = 0;
736
737 /* Card may still be sending BUSY after a previous operation,
738 * typically some kind of write. If so, we can't proceed yet.
739 */
740 while (time_before(jiffies, timeout)) {
741 mmcst1 = readl(host->base + DAVINCI_MMCST1);
742 if (!(mmcst1 & MMCST1_BUSY))
743 break;
744 cpu_relax();
745 }
746 if (mmcst1 & MMCST1_BUSY) {
747 dev_err(mmc_dev(host->mmc), "still BUSY? bad ... \n");
748 req->cmd->error = -ETIMEDOUT;
749 mmc_request_done(mmc, req);
750 return;
751 }
752
753 host->do_dma = 0;
754 mmc_davinci_prepare_data(host, req);
755 mmc_davinci_start_command(host, req->cmd);
756}
757
758static unsigned int calculate_freq_for_card(struct mmc_davinci_host *host,
759 unsigned int mmc_req_freq)
760{
761 unsigned int mmc_freq = 0, mmc_pclk = 0, mmc_push_pull_divisor = 0;
762
763 mmc_pclk = host->mmc_input_clk;
764 if (mmc_req_freq && mmc_pclk > (2 * mmc_req_freq))
765 mmc_push_pull_divisor = ((unsigned int)mmc_pclk
766 / (2 * mmc_req_freq)) - 1;
767 else
768 mmc_push_pull_divisor = 0;
769
770 mmc_freq = (unsigned int)mmc_pclk
771 / (2 * (mmc_push_pull_divisor + 1));
772
773 if (mmc_freq > mmc_req_freq)
774 mmc_push_pull_divisor = mmc_push_pull_divisor + 1;
775 /* Convert ns to clock cycles */
776 if (mmc_req_freq <= 400000)
777 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
778 / (2 * (mmc_push_pull_divisor + 1)))/1000));
779 else
780 host->ns_in_one_cycle = (1000000) / (((mmc_pclk
781 / (2 * (mmc_push_pull_divisor + 1)))/1000000));
782
783 return mmc_push_pull_divisor;
784}
785
786static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
787{
788 unsigned int open_drain_freq = 0, mmc_pclk = 0;
789 unsigned int mmc_push_pull_freq = 0;
790 struct mmc_davinci_host *host = mmc_priv(mmc);
791
792 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
793 u32 temp;
794
795 /* Ignoring the init clock value passed for fixing the inter
796 * operability with different cards.
797 */
798 open_drain_freq = ((unsigned int)mmc_pclk
799 / (2 * MMCSD_INIT_CLOCK)) - 1;
800
801 if (open_drain_freq > 0xFF)
802 open_drain_freq = 0xFF;
803
804 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
805 temp |= open_drain_freq;
806 writel(temp, host->base + DAVINCI_MMCCLK);
807
808 /* Convert ns to clock cycles */
809 host->ns_in_one_cycle = (1000000) / (MMCSD_INIT_CLOCK/1000);
810 } else {
811 u32 temp;
812 mmc_push_pull_freq = calculate_freq_for_card(host, ios->clock);
813
814 if (mmc_push_pull_freq > 0xFF)
815 mmc_push_pull_freq = 0xFF;
816
817 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKEN;
818 writel(temp, host->base + DAVINCI_MMCCLK);
819
820 udelay(10);
821
822 temp = readl(host->base + DAVINCI_MMCCLK) & ~MMCCLK_CLKRT_MASK;
823 temp |= mmc_push_pull_freq;
824 writel(temp, host->base + DAVINCI_MMCCLK);
825
826 writel(temp | MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
827
828 udelay(10);
829 }
830}
831
832static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
833{
834 struct mmc_davinci_host *host = mmc_priv(mmc);
835 struct platform_device *pdev = to_platform_device(mmc->parent);
836 struct davinci_mmc_config *config = pdev->dev.platform_data;
837
838 dev_dbg(mmc_dev(host->mmc),
839 "clock %dHz busmode %d powermode %d Vdd %04x\n",
840 ios->clock, ios->bus_mode, ios->power_mode,
841 ios->vdd);
842
843 switch (ios->power_mode) {
844 case MMC_POWER_OFF:
845 if (config && config->set_power)
846 config->set_power(pdev->id, false);
847 break;
848 case MMC_POWER_UP:
849 if (config && config->set_power)
850 config->set_power(pdev->id, true);
851 break;
852 }
853
854 switch (ios->bus_width) {
855 case MMC_BUS_WIDTH_8:
856 dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");
857 writel((readl(host->base + DAVINCI_MMCCTL) &
858 ~MMCCTL_WIDTH_4_BIT) | MMCCTL_WIDTH_8_BIT,
859 host->base + DAVINCI_MMCCTL);
860 break;
861 case MMC_BUS_WIDTH_4:
862 dev_dbg(mmc_dev(host->mmc), "Enabling 4 bit mode\n");
863 if (host->version == MMC_CTLR_VERSION_2)
864 writel((readl(host->base + DAVINCI_MMCCTL) &
865 ~MMCCTL_WIDTH_8_BIT) | MMCCTL_WIDTH_4_BIT,
866 host->base + DAVINCI_MMCCTL);
867 else
868 writel(readl(host->base + DAVINCI_MMCCTL) |
869 MMCCTL_WIDTH_4_BIT,
870 host->base + DAVINCI_MMCCTL);
871 break;
872 case MMC_BUS_WIDTH_1:
873 dev_dbg(mmc_dev(host->mmc), "Enabling 1 bit mode\n");
874 if (host->version == MMC_CTLR_VERSION_2)
875 writel(readl(host->base + DAVINCI_MMCCTL) &
876 ~(MMCCTL_WIDTH_8_BIT | MMCCTL_WIDTH_4_BIT),
877 host->base + DAVINCI_MMCCTL);
878 else
879 writel(readl(host->base + DAVINCI_MMCCTL) &
880 ~MMCCTL_WIDTH_4_BIT,
881 host->base + DAVINCI_MMCCTL);
882 break;
883 }
884
885 calculate_clk_divider(mmc, ios);
886
887 host->bus_mode = ios->bus_mode;
888 if (ios->power_mode == MMC_POWER_UP) {
889 unsigned long timeout = jiffies + msecs_to_jiffies(50);
890 bool lose = true;
891
892 /* Send clock cycles, poll completion */
893 writel(0, host->base + DAVINCI_MMCARGHL);
894 writel(MMCCMD_INITCK, host->base + DAVINCI_MMCCMD);
895 while (time_before(jiffies, timeout)) {
896 u32 tmp = readl(host->base + DAVINCI_MMCST0);
897
898 if (tmp & MMCST0_RSPDNE) {
899 lose = false;
900 break;
901 }
902 cpu_relax();
903 }
904 if (lose)
905 dev_warn(mmc_dev(host->mmc), "powerup timeout\n");
906 }
907
908 /* FIXME on power OFF, reset things ... */
909}
910
911static void
912mmc_davinci_xfer_done(struct mmc_davinci_host *host, struct mmc_data *data)
913{
914 host->data = NULL;
915
916 if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
917 /*
918 * SDIO Interrupt Detection work-around as suggested by
919 * Davinci Errata (TMS320DM355 Silicon Revision 1.1 Errata
920 * 2.1.6): Signal SDIO interrupt only if it is enabled by core
921 */
922 if (host->sdio_int && !(readl(host->base + DAVINCI_SDIOST0) &
923 SDIOST0_DAT1_HI)) {
924 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
925 mmc_signal_sdio_irq(host->mmc);
926 }
927 }
928
929 if (host->do_dma) {
930 davinci_abort_dma(host);
931
932 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
933 (data->flags & MMC_DATA_WRITE)
934 ? DMA_TO_DEVICE
935 : DMA_FROM_DEVICE);
936 host->do_dma = false;
937 }
938 host->data_dir = DAVINCI_MMC_DATADIR_NONE;
939
940 if (!data->stop || (host->cmd && host->cmd->error)) {
941 mmc_request_done(host->mmc, data->mrq);
942 writel(0, host->base + DAVINCI_MMCIM);
943 host->active_request = false;
944 } else
945 mmc_davinci_start_command(host, data->stop);
946}
947
948static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
949 struct mmc_command *cmd)
950{
951 host->cmd = NULL;
952
953 if (cmd->flags & MMC_RSP_PRESENT) {
954 if (cmd->flags & MMC_RSP_136) {
955 /* response type 2 */
956 cmd->resp[3] = readl(host->base + DAVINCI_MMCRSP01);
957 cmd->resp[2] = readl(host->base + DAVINCI_MMCRSP23);
958 cmd->resp[1] = readl(host->base + DAVINCI_MMCRSP45);
959 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
960 } else {
961 /* response types 1, 1b, 3, 4, 5, 6 */
962 cmd->resp[0] = readl(host->base + DAVINCI_MMCRSP67);
963 }
964 }
965
966 if (host->data == NULL || cmd->error) {
967 if (cmd->error == -ETIMEDOUT)
968 cmd->mrq->cmd->retries = 0;
969 mmc_request_done(host->mmc, cmd->mrq);
970 writel(0, host->base + DAVINCI_MMCIM);
971 host->active_request = false;
972 }
973}
974
975static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
976 int val)
977{
978 u32 temp;
979
980 temp = readl(host->base + DAVINCI_MMCCTL);
981 if (val) /* reset */
982 temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
983 else /* enable */
984 temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
985
986 writel(temp, host->base + DAVINCI_MMCCTL);
987 udelay(10);
988}
989
990static void
991davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
992{
993 mmc_davinci_reset_ctrl(host, 1);
994 mmc_davinci_reset_ctrl(host, 0);
995}
996
997static irqreturn_t mmc_davinci_sdio_irq(int irq, void *dev_id)
998{
999 struct mmc_davinci_host *host = dev_id;
1000 unsigned int status;
1001
1002 status = readl(host->base + DAVINCI_SDIOIST);
1003 if (status & SDIOIST_IOINT) {
1004 dev_dbg(mmc_dev(host->mmc),
1005 "SDIO interrupt status %x\n", status);
1006 writel(status | SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
1007 mmc_signal_sdio_irq(host->mmc);
1008 }
1009 return IRQ_HANDLED;
1010}
1011
1012static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
1013{
1014 struct mmc_davinci_host *host = (struct mmc_davinci_host *)dev_id;
1015 unsigned int status, qstatus;
1016 int end_command = 0;
1017 int end_transfer = 0;
1018 struct mmc_data *data = host->data;
1019
1020 if (host->cmd == NULL && host->data == NULL) {
1021 status = readl(host->base + DAVINCI_MMCST0);
1022 dev_dbg(mmc_dev(host->mmc),
1023 "Spurious interrupt 0x%04x\n", status);
1024 /* Disable the interrupt from mmcsd */
1025 writel(0, host->base + DAVINCI_MMCIM);
1026 return IRQ_NONE;
1027 }
1028
1029 status = readl(host->base + DAVINCI_MMCST0);
1030 qstatus = status;
1031
1032 /* handle FIFO first when using PIO for data.
1033 * bytes_left will decrease to zero as I/O progress and status will
1034 * read zero over iteration because this controller status
1035 * register(MMCST0) reports any status only once and it is cleared
1036 * by read. So, it is not unbouned loop even in the case of
1037 * non-dma.
1038 */
1039 if (host->bytes_left && (status & (MMCST0_DXRDY | MMCST0_DRRDY))) {
1040 unsigned long im_val;
1041
1042 /*
1043 * If interrupts fire during the following loop, they will be
1044 * handled by the handler, but the PIC will still buffer these.
1045 * As a result, the handler will be called again to serve these
1046 * needlessly. In order to avoid these spurious interrupts,
1047 * keep interrupts masked during the loop.
1048 */
1049 im_val = readl(host->base + DAVINCI_MMCIM);
1050 writel(0, host->base + DAVINCI_MMCIM);
1051
1052 do {
1053 davinci_fifo_data_trans(host, rw_threshold);
1054 status = readl(host->base + DAVINCI_MMCST0);
1055 qstatus |= status;
1056 } while (host->bytes_left &&
1057 (status & (MMCST0_DXRDY | MMCST0_DRRDY)));
1058
1059 /*
1060 * If an interrupt is pending, it is assumed it will fire when
1061 * it is unmasked. This assumption is also taken when the MMCIM
1062 * is first set. Otherwise, writing to MMCIM after reading the
1063 * status is race-prone.
1064 */
1065 writel(im_val, host->base + DAVINCI_MMCIM);
1066 }
1067
1068 if (qstatus & MMCST0_DATDNE) {
1069 /* All blocks sent/received, and CRC checks passed */
1070 if (data != NULL) {
1071 if ((host->do_dma == 0) && (host->bytes_left > 0)) {
1072 /* if datasize < rw_threshold
1073 * no RX ints are generated
1074 */
1075 davinci_fifo_data_trans(host, host->bytes_left);
1076 }
1077 end_transfer = 1;
1078 data->bytes_xfered = data->blocks * data->blksz;
1079 } else {
1080 dev_err(mmc_dev(host->mmc),
1081 "DATDNE with no host->data\n");
1082 }
1083 }
1084
1085 if (qstatus & MMCST0_TOUTRD) {
1086 /* Read data timeout */
1087 data->error = -ETIMEDOUT;
1088 end_transfer = 1;
1089
1090 dev_dbg(mmc_dev(host->mmc),
1091 "read data timeout, status %x\n",
1092 qstatus);
1093
1094 davinci_abort_data(host, data);
1095 }
1096
1097 if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {
1098 /* Data CRC error */
1099 data->error = -EILSEQ;
1100 end_transfer = 1;
1101
1102 /* NOTE: this controller uses CRCWR to report both CRC
1103 * errors and timeouts (on writes). MMCDRSP values are
1104 * only weakly documented, but 0x9f was clearly a timeout
1105 * case and the two three-bit patterns in various SD specs
1106 * (101, 010) aren't part of it ...
1107 */
1108 if (qstatus & MMCST0_CRCWR) {
1109 u32 temp = readb(host->base + DAVINCI_MMCDRSP);
1110
1111 if (temp == 0x9f)
1112 data->error = -ETIMEDOUT;
1113 }
1114 dev_dbg(mmc_dev(host->mmc), "data %s %s error\n",
1115 (qstatus & MMCST0_CRCWR) ? "write" : "read",
1116 (data->error == -ETIMEDOUT) ? "timeout" : "CRC");
1117
1118 davinci_abort_data(host, data);
1119 }
1120
1121 if (qstatus & MMCST0_TOUTRS) {
1122 /* Command timeout */
1123 if (host->cmd) {
1124 dev_dbg(mmc_dev(host->mmc),
1125 "CMD%d timeout, status %x\n",
1126 host->cmd->opcode, qstatus);
1127 host->cmd->error = -ETIMEDOUT;
1128 if (data) {
1129 end_transfer = 1;
1130 davinci_abort_data(host, data);
1131 } else
1132 end_command = 1;
1133 }
1134 }
1135
1136 if (qstatus & MMCST0_CRCRS) {
1137 /* Command CRC error */
1138 dev_dbg(mmc_dev(host->mmc), "Command CRC error\n");
1139 if (host->cmd) {
1140 host->cmd->error = -EILSEQ;
1141 end_command = 1;
1142 }
1143 }
1144
1145 if (qstatus & MMCST0_RSPDNE) {
1146 /* End of command phase */
1147 end_command = (int) host->cmd;
1148 }
1149
1150 if (end_command)
1151 mmc_davinci_cmd_done(host, host->cmd);
1152 if (end_transfer)
1153 mmc_davinci_xfer_done(host, data);
1154 return IRQ_HANDLED;
1155}
1156
1157static int mmc_davinci_get_cd(struct mmc_host *mmc)
1158{
1159 struct platform_device *pdev = to_platform_device(mmc->parent);
1160 struct davinci_mmc_config *config = pdev->dev.platform_data;
1161
1162 if (!config || !config->get_cd)
1163 return -ENOSYS;
1164 return config->get_cd(pdev->id);
1165}
1166
1167static int mmc_davinci_get_ro(struct mmc_host *mmc)
1168{
1169 struct platform_device *pdev = to_platform_device(mmc->parent);
1170 struct davinci_mmc_config *config = pdev->dev.platform_data;
1171
1172 if (!config || !config->get_ro)
1173 return -ENOSYS;
1174 return config->get_ro(pdev->id);
1175}
1176
1177static void mmc_davinci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1178{
1179 struct mmc_davinci_host *host = mmc_priv(mmc);
1180
1181 if (enable) {
1182 if (!(readl(host->base + DAVINCI_SDIOST0) & SDIOST0_DAT1_HI)) {
1183 writel(SDIOIST_IOINT, host->base + DAVINCI_SDIOIST);
1184 mmc_signal_sdio_irq(host->mmc);
1185 } else {
1186 host->sdio_int = true;
1187 writel(readl(host->base + DAVINCI_SDIOIEN) |
1188 SDIOIEN_IOINTEN, host->base + DAVINCI_SDIOIEN);
1189 }
1190 } else {
1191 host->sdio_int = false;
1192 writel(readl(host->base + DAVINCI_SDIOIEN) & ~SDIOIEN_IOINTEN,
1193 host->base + DAVINCI_SDIOIEN);
1194 }
1195}
1196
1197static struct mmc_host_ops mmc_davinci_ops = {
1198 .request = mmc_davinci_request,
1199 .set_ios = mmc_davinci_set_ios,
1200 .get_cd = mmc_davinci_get_cd,
1201 .get_ro = mmc_davinci_get_ro,
1202 .enable_sdio_irq = mmc_davinci_enable_sdio_irq,
1203};
1204
1205/*----------------------------------------------------------------------*/
1206
1207#ifdef CONFIG_CPU_FREQ
1208static int mmc_davinci_cpufreq_transition(struct notifier_block *nb,
1209 unsigned long val, void *data)
1210{
1211 struct mmc_davinci_host *host;
1212 unsigned int mmc_pclk;
1213 struct mmc_host *mmc;
1214 unsigned long flags;
1215
1216 host = container_of(nb, struct mmc_davinci_host, freq_transition);
1217 mmc = host->mmc;
1218 mmc_pclk = clk_get_rate(host->clk);
1219
1220 if (val == CPUFREQ_POSTCHANGE) {
1221 spin_lock_irqsave(&mmc->lock, flags);
1222 host->mmc_input_clk = mmc_pclk;
1223 calculate_clk_divider(mmc, &mmc->ios);
1224 spin_unlock_irqrestore(&mmc->lock, flags);
1225 }
1226
1227 return 0;
1228}
1229
1230static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1231{
1232 host->freq_transition.notifier_call = mmc_davinci_cpufreq_transition;
1233
1234 return cpufreq_register_notifier(&host->freq_transition,
1235 CPUFREQ_TRANSITION_NOTIFIER);
1236}
1237
1238static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1239{
1240 cpufreq_unregister_notifier(&host->freq_transition,
1241 CPUFREQ_TRANSITION_NOTIFIER);
1242}
1243#else
1244static inline int mmc_davinci_cpufreq_register(struct mmc_davinci_host *host)
1245{
1246 return 0;
1247}
1248
1249static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
1250{
1251}
1252#endif
1253static void __init init_mmcsd_host(struct mmc_davinci_host *host)
1254{
1255
1256 mmc_davinci_reset_ctrl(host, 1);
1257
1258 writel(0, host->base + DAVINCI_MMCCLK);
1259 writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
1260
1261 writel(0x1FFF, host->base + DAVINCI_MMCTOR);
1262 writel(0xFFFF, host->base + DAVINCI_MMCTOD);
1263
1264 mmc_davinci_reset_ctrl(host, 0);
1265}
1266
1267static int __init davinci_mmcsd_probe(struct platform_device *pdev)
1268{
1269 struct davinci_mmc_config *pdata = pdev->dev.platform_data;
1270 struct mmc_davinci_host *host = NULL;
1271 struct mmc_host *mmc = NULL;
1272 struct resource *r, *mem = NULL;
1273 int ret = 0, irq = 0;
1274 size_t mem_size;
1275
1276 /* REVISIT: when we're fully converted, fail if pdata is NULL */
1277
1278 ret = -ENODEV;
1279 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1280 irq = platform_get_irq(pdev, 0);
1281 if (!r || irq == NO_IRQ)
1282 goto out;
1283
1284 ret = -EBUSY;
1285 mem_size = resource_size(r);
1286 mem = request_mem_region(r->start, mem_size, pdev->name);
1287 if (!mem)
1288 goto out;
1289
1290 ret = -ENOMEM;
1291 mmc = mmc_alloc_host(sizeof(struct mmc_davinci_host), &pdev->dev);
1292 if (!mmc)
1293 goto out;
1294
1295 host = mmc_priv(mmc);
1296 host->mmc = mmc; /* Important */
1297
1298 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1299 if (!r)
1300 goto out;
1301 host->rxdma = r->start;
1302
1303 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1304 if (!r)
1305 goto out;
1306 host->txdma = r->start;
1307
1308 host->mem_res = mem;
1309 host->base = ioremap(mem->start, mem_size);
1310 if (!host->base)
1311 goto out;
1312
1313 ret = -ENXIO;
1314 host->clk = clk_get(&pdev->dev, "MMCSDCLK");
1315 if (IS_ERR(host->clk)) {
1316 ret = PTR_ERR(host->clk);
1317 goto out;
1318 }
1319 clk_enable(host->clk);
1320 host->mmc_input_clk = clk_get_rate(host->clk);
1321
1322 init_mmcsd_host(host);
1323
1324 if (pdata->nr_sg)
1325 host->nr_sg = pdata->nr_sg - 1;
1326
1327 if (host->nr_sg > MAX_NR_SG || !host->nr_sg)
1328 host->nr_sg = MAX_NR_SG;
1329
1330 host->use_dma = use_dma;
1331 host->mmc_irq = irq;
1332 host->sdio_irq = platform_get_irq(pdev, 1);
1333
1334 if (host->use_dma && davinci_acquire_dma_channels(host) != 0)
1335 host->use_dma = 0;
1336
1337 /* REVISIT: someday, support IRQ-driven card detection. */
1338 mmc->caps |= MMC_CAP_NEEDS_POLL;
1339 mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
1340
1341 if (pdata && (pdata->wires == 4 || pdata->wires == 0))
1342 mmc->caps |= MMC_CAP_4_BIT_DATA;
1343
1344 if (pdata && (pdata->wires == 8))
1345 mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
1346
1347 host->version = pdata->version;
1348
1349 mmc->ops = &mmc_davinci_ops;
1350 mmc->f_min = 312500;
1351 mmc->f_max = 25000000;
1352 if (pdata && pdata->max_freq)
1353 mmc->f_max = pdata->max_freq;
1354 if (pdata && pdata->caps)
1355 mmc->caps |= pdata->caps;
1356 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1357
1358 /* With no iommu coalescing pages, each phys_seg is a hw_seg.
1359 * Each hw_seg uses one EDMA parameter RAM slot, always one
1360 * channel and then usually some linked slots.
1361 */
1362 mmc->max_segs = 1 + host->n_link;
1363
1364 /* EDMA limit per hw segment (one or two MBytes) */
1365 mmc->max_seg_size = MAX_CCNT * rw_threshold;
1366
1367 /* MMC/SD controller limits for multiblock requests */
1368 mmc->max_blk_size = 4095; /* BLEN is 12 bits */
1369 mmc->max_blk_count = 65535; /* NBLK is 16 bits */
1370 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1371
1372 dev_dbg(mmc_dev(host->mmc), "max_segs=%d\n", mmc->max_segs);
1373 dev_dbg(mmc_dev(host->mmc), "max_blk_size=%d\n", mmc->max_blk_size);
1374 dev_dbg(mmc_dev(host->mmc), "max_req_size=%d\n", mmc->max_req_size);
1375 dev_dbg(mmc_dev(host->mmc), "max_seg_size=%d\n", mmc->max_seg_size);
1376
1377 platform_set_drvdata(pdev, host);
1378
1379 ret = mmc_davinci_cpufreq_register(host);
1380 if (ret) {
1381 dev_err(&pdev->dev, "failed to register cpufreq\n");
1382 goto cpu_freq_fail;
1383 }
1384
1385 ret = mmc_add_host(mmc);
1386 if (ret < 0)
1387 goto out;
1388
1389 ret = request_irq(irq, mmc_davinci_irq, 0, mmc_hostname(mmc), host);
1390 if (ret)
1391 goto out;
1392
1393 if (host->sdio_irq >= 0) {
1394 ret = request_irq(host->sdio_irq, mmc_davinci_sdio_irq, 0,
1395 mmc_hostname(mmc), host);
1396 if (!ret)
1397 mmc->caps |= MMC_CAP_SDIO_IRQ;
1398 }
1399
1400 rename_region(mem, mmc_hostname(mmc));
1401
1402 dev_info(mmc_dev(host->mmc), "Using %s, %d-bit mode\n",
1403 host->use_dma ? "DMA" : "PIO",
1404 (mmc->caps & MMC_CAP_4_BIT_DATA) ? 4 : 1);
1405
1406 return 0;
1407
1408out:
1409 mmc_davinci_cpufreq_deregister(host);
1410cpu_freq_fail:
1411 if (host) {
1412 davinci_release_dma_channels(host);
1413
1414 if (host->clk) {
1415 clk_disable(host->clk);
1416 clk_put(host->clk);
1417 }
1418
1419 if (host->base)
1420 iounmap(host->base);
1421 }
1422
1423 if (mmc)
1424 mmc_free_host(mmc);
1425
1426 if (mem)
1427 release_resource(mem);
1428
1429 dev_dbg(&pdev->dev, "probe err %d\n", ret);
1430
1431 return ret;
1432}
1433
1434static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
1435{
1436 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1437
1438 platform_set_drvdata(pdev, NULL);
1439 if (host) {
1440 mmc_davinci_cpufreq_deregister(host);
1441
1442 mmc_remove_host(host->mmc);
1443 free_irq(host->mmc_irq, host);
1444 if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
1445 free_irq(host->sdio_irq, host);
1446
1447 davinci_release_dma_channels(host);
1448
1449 clk_disable(host->clk);
1450 clk_put(host->clk);
1451
1452 iounmap(host->base);
1453
1454 release_resource(host->mem_res);
1455
1456 mmc_free_host(host->mmc);
1457 }
1458
1459 return 0;
1460}
1461
1462#ifdef CONFIG_PM
1463static int davinci_mmcsd_suspend(struct device *dev)
1464{
1465 struct platform_device *pdev = to_platform_device(dev);
1466 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1467 int ret;
1468
1469 ret = mmc_suspend_host(host->mmc);
1470 if (!ret) {
1471 writel(0, host->base + DAVINCI_MMCIM);
1472 mmc_davinci_reset_ctrl(host, 1);
1473 clk_disable(host->clk);
1474 host->suspended = 1;
1475 } else {
1476 host->suspended = 0;
1477 }
1478
1479 return ret;
1480}
1481
1482static int davinci_mmcsd_resume(struct device *dev)
1483{
1484 struct platform_device *pdev = to_platform_device(dev);
1485 struct mmc_davinci_host *host = platform_get_drvdata(pdev);
1486 int ret;
1487
1488 if (!host->suspended)
1489 return 0;
1490
1491 clk_enable(host->clk);
1492
1493 mmc_davinci_reset_ctrl(host, 0);
1494 ret = mmc_resume_host(host->mmc);
1495 if (!ret)
1496 host->suspended = 0;
1497
1498 return ret;
1499}
1500
1501static const struct dev_pm_ops davinci_mmcsd_pm = {
1502 .suspend = davinci_mmcsd_suspend,
1503 .resume = davinci_mmcsd_resume,
1504};
1505
1506#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
1507#else
1508#define davinci_mmcsd_pm_ops NULL
1509#endif
1510
1511static struct platform_driver davinci_mmcsd_driver = {
1512 .driver = {
1513 .name = "davinci_mmc",
1514 .owner = THIS_MODULE,
1515 .pm = davinci_mmcsd_pm_ops,
1516 },
1517 .remove = __exit_p(davinci_mmcsd_remove),
1518};
1519
1520static int __init davinci_mmcsd_init(void)
1521{
1522 return platform_driver_probe(&davinci_mmcsd_driver,
1523 davinci_mmcsd_probe);
1524}
1525module_init(davinci_mmcsd_init);
1526
1527static void __exit davinci_mmcsd_exit(void)
1528{
1529 platform_driver_unregister(&davinci_mmcsd_driver);
1530}
1531module_exit(davinci_mmcsd_exit);
1532
1533MODULE_AUTHOR("Texas Instruments India");
1534MODULE_LICENSE("GPL");
1535MODULE_DESCRIPTION("MMC/SD driver for Davinci MMC controller");
1536MODULE_ALIAS("platform:davinci_mmc");
1537