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m68k/defconfig: Enable automounting of devtmpfs at /dev
[linux/fpc-iii.git] / drivers / mmc / host / dw_mmc.c
blob67c04518ec4c38c0657e2fef713e1b6cd51348f6
1 /*
2 * Synopsys DesignWare Multimedia Card Interface driver
3 * (Based on NXP driver for lpc 31xx)
4 *
5 * Copyright (C) 2009 NXP Semiconductors
6 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
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
14 #include <linux/blkdev.h>
15 #include <linux/clk.h>
16 #include <linux/debugfs.h>
17 #include <linux/device.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/interrupt.h>
22 #include <linux/ioport.h>
23 #include <linux/module.h>
24 #include <linux/platform_device.h>
25 #include <linux/seq_file.h>
26 #include <linux/slab.h>
27 #include <linux/stat.h>
28 #include <linux/delay.h>
29 #include <linux/irq.h>
30 #include <linux/mmc/host.h>
31 #include <linux/mmc/mmc.h>
32 #include <linux/mmc/sd.h>
33 #include <linux/mmc/sdio.h>
34 #include <linux/mmc/dw_mmc.h>
35 #include <linux/bitops.h>
36 #include <linux/regulator/consumer.h>
37 #include <linux/of.h>
38 #include <linux/of_gpio.h>
39 #include <linux/mmc/slot-gpio.h>
40
41 #include "dw_mmc.h"
42
43 /* Common flag combinations */
44 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
45 SDMMC_INT_HTO | SDMMC_INT_SBE | \
46 SDMMC_INT_EBE)
47 #define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
48 SDMMC_INT_RESP_ERR)
49 #define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
50 DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
51 #define DW_MCI_SEND_STATUS 1
52 #define DW_MCI_RECV_STATUS 2
53 #define DW_MCI_DMA_THRESHOLD 16
54
55 #define DW_MCI_FREQ_MAX 200000000 /* unit: HZ */
56 #define DW_MCI_FREQ_MIN 400000 /* unit: HZ */
57
58 #ifdef CONFIG_MMC_DW_IDMAC
59 #define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
60 SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
61 SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
62 SDMMC_IDMAC_INT_TI)
63
64 struct idmac_desc_64addr {
65 u32 des0; /* Control Descriptor */
66
67 u32 des1; /* Reserved */
68
69 u32 des2; /*Buffer sizes */
70 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \
71 ((d)->des2 = ((d)->des2 & 0x03ffe000) | ((s) & 0x1fff))
72
73 u32 des3; /* Reserved */
74
75 u32 des4; /* Lower 32-bits of Buffer Address Pointer 1*/
76 u32 des5; /* Upper 32-bits of Buffer Address Pointer 1*/
77
78 u32 des6; /* Lower 32-bits of Next Descriptor Address */
79 u32 des7; /* Upper 32-bits of Next Descriptor Address */
80 };
81
82 struct idmac_desc {
83 u32 des0; /* Control Descriptor */
84 #define IDMAC_DES0_DIC BIT(1)
85 #define IDMAC_DES0_LD BIT(2)
86 #define IDMAC_DES0_FD BIT(3)
87 #define IDMAC_DES0_CH BIT(4)
88 #define IDMAC_DES0_ER BIT(5)
89 #define IDMAC_DES0_CES BIT(30)
90 #define IDMAC_DES0_OWN BIT(31)
91
92 u32 des1; /* Buffer sizes */
93 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
94 ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
95
96 u32 des2; /* buffer 1 physical address */
97
98 u32 des3; /* buffer 2 physical address */
99 };
100 #endif /* CONFIG_MMC_DW_IDMAC */
101
102 static bool dw_mci_reset(struct dw_mci *host);
103 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset);
104
105 #if defined(CONFIG_DEBUG_FS)
106 static int dw_mci_req_show(struct seq_file *s, void *v)
107 {
108 struct dw_mci_slot *slot = s->private;
109 struct mmc_request *mrq;
110 struct mmc_command *cmd;
111 struct mmc_command *stop;
112 struct mmc_data *data;
113
114 /* Make sure we get a consistent snapshot */
115 spin_lock_bh(&slot->host->lock);
116 mrq = slot->mrq;
117
118 if (mrq) {
119 cmd = mrq->cmd;
120 data = mrq->data;
121 stop = mrq->stop;
122
123 if (cmd)
124 seq_printf(s,
125 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
126 cmd->opcode, cmd->arg, cmd->flags,
127 cmd->resp[0], cmd->resp[1], cmd->resp[2],
128 cmd->resp[2], cmd->error);
129 if (data)
130 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
131 data->bytes_xfered, data->blocks,
132 data->blksz, data->flags, data->error);
133 if (stop)
134 seq_printf(s,
135 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
136 stop->opcode, stop->arg, stop->flags,
137 stop->resp[0], stop->resp[1], stop->resp[2],
138 stop->resp[2], stop->error);
139 }
140
141 spin_unlock_bh(&slot->host->lock);
142
143 return 0;
144 }
145
146 static int dw_mci_req_open(struct inode *inode, struct file *file)
147 {
148 return single_open(file, dw_mci_req_show, inode->i_private);
149 }
150
151 static const struct file_operations dw_mci_req_fops = {
152 .owner = THIS_MODULE,
153 .open = dw_mci_req_open,
154 .read = seq_read,
155 .llseek = seq_lseek,
156 .release = single_release,
157 };
158
159 static int dw_mci_regs_show(struct seq_file *s, void *v)
160 {
161 seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
162 seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
163 seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
164 seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
165 seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
166 seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
167
168 return 0;
169 }
170
171 static int dw_mci_regs_open(struct inode *inode, struct file *file)
172 {
173 return single_open(file, dw_mci_regs_show, inode->i_private);
174 }
175
176 static const struct file_operations dw_mci_regs_fops = {
177 .owner = THIS_MODULE,
178 .open = dw_mci_regs_open,
179 .read = seq_read,
180 .llseek = seq_lseek,
181 .release = single_release,
182 };
183
184 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
185 {
186 struct mmc_host *mmc = slot->mmc;
187 struct dw_mci *host = slot->host;
188 struct dentry *root;
189 struct dentry *node;
190
191 root = mmc->debugfs_root;
192 if (!root)
193 return;
194
195 node = debugfs_create_file("regs", S_IRUSR, root, host,
196 &dw_mci_regs_fops);
197 if (!node)
198 goto err;
199
200 node = debugfs_create_file("req", S_IRUSR, root, slot,
201 &dw_mci_req_fops);
202 if (!node)
203 goto err;
204
205 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
206 if (!node)
207 goto err;
208
209 node = debugfs_create_x32("pending_events", S_IRUSR, root,
210 (u32 *)&host->pending_events);
211 if (!node)
212 goto err;
213
214 node = debugfs_create_x32("completed_events", S_IRUSR, root,
215 (u32 *)&host->completed_events);
216 if (!node)
217 goto err;
218
219 return;
220
221 err:
222 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
223 }
224 #endif /* defined(CONFIG_DEBUG_FS) */
225
226 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg);
227
228 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
229 {
230 struct mmc_data *data;
231 struct dw_mci_slot *slot = mmc_priv(mmc);
232 struct dw_mci *host = slot->host;
233 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
234 u32 cmdr;
235 cmd->error = -EINPROGRESS;
236
237 cmdr = cmd->opcode;
238
239 if (cmd->opcode == MMC_STOP_TRANSMISSION ||
240 cmd->opcode == MMC_GO_IDLE_STATE ||
241 cmd->opcode == MMC_GO_INACTIVE_STATE ||
242 (cmd->opcode == SD_IO_RW_DIRECT &&
243 ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT))
244 cmdr |= SDMMC_CMD_STOP;
245 else if (cmd->opcode != MMC_SEND_STATUS && cmd->data)
246 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
247
248 if (cmd->opcode == SD_SWITCH_VOLTAGE) {
249 u32 clk_en_a;
250
251 /* Special bit makes CMD11 not die */
252 cmdr |= SDMMC_CMD_VOLT_SWITCH;
253
254 /* Change state to continue to handle CMD11 weirdness */
255 WARN_ON(slot->host->state != STATE_SENDING_CMD);
256 slot->host->state = STATE_SENDING_CMD11;
257
258 /*
259 * We need to disable low power mode (automatic clock stop)
260 * while doing voltage switch so we don't confuse the card,
261 * since stopping the clock is a specific part of the UHS
262 * voltage change dance.
263 *
264 * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be
265 * unconditionally turned back on in dw_mci_setup_bus() if it's
266 * ever called with a non-zero clock. That shouldn't happen
267 * until the voltage change is all done.
268 */
269 clk_en_a = mci_readl(host, CLKENA);
270 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id);
271 mci_writel(host, CLKENA, clk_en_a);
272 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
273 SDMMC_CMD_PRV_DAT_WAIT, 0);
274 }
275
276 if (cmd->flags & MMC_RSP_PRESENT) {
277 /* We expect a response, so set this bit */
278 cmdr |= SDMMC_CMD_RESP_EXP;
279 if (cmd->flags & MMC_RSP_136)
280 cmdr |= SDMMC_CMD_RESP_LONG;
281 }
282
283 if (cmd->flags & MMC_RSP_CRC)
284 cmdr |= SDMMC_CMD_RESP_CRC;
285
286 data = cmd->data;
287 if (data) {
288 cmdr |= SDMMC_CMD_DAT_EXP;
289 if (data->flags & MMC_DATA_STREAM)
290 cmdr |= SDMMC_CMD_STRM_MODE;
291 if (data->flags & MMC_DATA_WRITE)
292 cmdr |= SDMMC_CMD_DAT_WR;
293 }
294
295 if (drv_data && drv_data->prepare_command)
296 drv_data->prepare_command(slot->host, &cmdr);
297
298 return cmdr;
299 }
300
301 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd)
302 {
303 struct mmc_command *stop;
304 u32 cmdr;
305
306 if (!cmd->data)
307 return 0;
308
309 stop = &host->stop_abort;
310 cmdr = cmd->opcode;
311 memset(stop, 0, sizeof(struct mmc_command));
312
313 if (cmdr == MMC_READ_SINGLE_BLOCK ||
314 cmdr == MMC_READ_MULTIPLE_BLOCK ||
315 cmdr == MMC_WRITE_BLOCK ||
316 cmdr == MMC_WRITE_MULTIPLE_BLOCK) {
317 stop->opcode = MMC_STOP_TRANSMISSION;
318 stop->arg = 0;
319 stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
320 } else if (cmdr == SD_IO_RW_EXTENDED) {
321 stop->opcode = SD_IO_RW_DIRECT;
322 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
323 ((cmd->arg >> 28) & 0x7);
324 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
325 } else {
326 return 0;
327 }
328
329 cmdr = stop->opcode | SDMMC_CMD_STOP |
330 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP;
331
332 return cmdr;
333 }
334
335 static void dw_mci_start_command(struct dw_mci *host,
336 struct mmc_command *cmd, u32 cmd_flags)
337 {
338 host->cmd = cmd;
339 dev_vdbg(host->dev,
340 "start command: ARGR=0x%08x CMDR=0x%08x\n",
341 cmd->arg, cmd_flags);
342
343 mci_writel(host, CMDARG, cmd->arg);
344 wmb();
345
346 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
347 }
348
349 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data)
350 {
351 struct mmc_command *stop = data->stop ? data->stop : &host->stop_abort;
352 dw_mci_start_command(host, stop, host->stop_cmdr);
353 }
354
355 /* DMA interface functions */
356 static void dw_mci_stop_dma(struct dw_mci *host)
357 {
358 if (host->using_dma) {
359 host->dma_ops->stop(host);
360 host->dma_ops->cleanup(host);
361 }
362
363 /* Data transfer was stopped by the interrupt handler */
364 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
365 }
366
367 static int dw_mci_get_dma_dir(struct mmc_data *data)
368 {
369 if (data->flags & MMC_DATA_WRITE)
370 return DMA_TO_DEVICE;
371 else
372 return DMA_FROM_DEVICE;
373 }
374
375 #ifdef CONFIG_MMC_DW_IDMAC
376 static void dw_mci_dma_cleanup(struct dw_mci *host)
377 {
378 struct mmc_data *data = host->data;
379
380 if (data)
381 if (!data->host_cookie)
382 dma_unmap_sg(host->dev,
383 data->sg,
384 data->sg_len,
385 dw_mci_get_dma_dir(data));
386 }
387
388 static void dw_mci_idmac_reset(struct dw_mci *host)
389 {
390 u32 bmod = mci_readl(host, BMOD);
391 /* Software reset of DMA */
392 bmod |= SDMMC_IDMAC_SWRESET;
393 mci_writel(host, BMOD, bmod);
394 }
395
396 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
397 {
398 u32 temp;
399
400 /* Disable and reset the IDMAC interface */
401 temp = mci_readl(host, CTRL);
402 temp &= ~SDMMC_CTRL_USE_IDMAC;
403 temp |= SDMMC_CTRL_DMA_RESET;
404 mci_writel(host, CTRL, temp);
405
406 /* Stop the IDMAC running */
407 temp = mci_readl(host, BMOD);
408 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
409 temp |= SDMMC_IDMAC_SWRESET;
410 mci_writel(host, BMOD, temp);
411 }
412
413 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
414 {
415 struct mmc_data *data = host->data;
416
417 dev_vdbg(host->dev, "DMA complete\n");
418
419 host->dma_ops->cleanup(host);
420
421 /*
422 * If the card was removed, data will be NULL. No point in trying to
423 * send the stop command or waiting for NBUSY in this case.
424 */
425 if (data) {
426 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
427 tasklet_schedule(&host->tasklet);
428 }
429 }
430
431 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
432 unsigned int sg_len)
433 {
434 int i;
435 if (host->dma_64bit_address == 1) {
436 struct idmac_desc_64addr *desc = host->sg_cpu;
437
438 for (i = 0; i < sg_len; i++, desc++) {
439 unsigned int length = sg_dma_len(&data->sg[i]);
440 u64 mem_addr = sg_dma_address(&data->sg[i]);
441
442 /*
443 * Set the OWN bit and disable interrupts for this
444 * descriptor
445 */
446 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
447 IDMAC_DES0_CH;
448 /* Buffer length */
449 IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, length);
450
451 /* Physical address to DMA to/from */
452 desc->des4 = mem_addr & 0xffffffff;
453 desc->des5 = mem_addr >> 32;
454 }
455
456 /* Set first descriptor */
457 desc = host->sg_cpu;
458 desc->des0 |= IDMAC_DES0_FD;
459
460 /* Set last descriptor */
461 desc = host->sg_cpu + (i - 1) *
462 sizeof(struct idmac_desc_64addr);
463 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
464 desc->des0 |= IDMAC_DES0_LD;
465
466 } else {
467 struct idmac_desc *desc = host->sg_cpu;
468
469 for (i = 0; i < sg_len; i++, desc++) {
470 unsigned int length = sg_dma_len(&data->sg[i]);
471 u32 mem_addr = sg_dma_address(&data->sg[i]);
472
473 /*
474 * Set the OWN bit and disable interrupts for this
475 * descriptor
476 */
477 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC |
478 IDMAC_DES0_CH;
479 /* Buffer length */
480 IDMAC_SET_BUFFER1_SIZE(desc, length);
481
482 /* Physical address to DMA to/from */
483 desc->des2 = mem_addr;
484 }
485
486 /* Set first descriptor */
487 desc = host->sg_cpu;
488 desc->des0 |= IDMAC_DES0_FD;
489
490 /* Set last descriptor */
491 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
492 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
493 desc->des0 |= IDMAC_DES0_LD;
494 }
495
496 wmb();
497 }
498
499 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
500 {
501 u32 temp;
502
503 dw_mci_translate_sglist(host, host->data, sg_len);
504
505 /* Make sure to reset DMA in case we did PIO before this */
506 dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET);
507 dw_mci_idmac_reset(host);
508
509 /* Select IDMAC interface */
510 temp = mci_readl(host, CTRL);
511 temp |= SDMMC_CTRL_USE_IDMAC;
512 mci_writel(host, CTRL, temp);
513
514 wmb();
515
516 /* Enable the IDMAC */
517 temp = mci_readl(host, BMOD);
518 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
519 mci_writel(host, BMOD, temp);
520
521 /* Start it running */
522 mci_writel(host, PLDMND, 1);
523 }
524
525 static int dw_mci_idmac_init(struct dw_mci *host)
526 {
527 int i;
528
529 if (host->dma_64bit_address == 1) {
530 struct idmac_desc_64addr *p;
531 /* Number of descriptors in the ring buffer */
532 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc_64addr);
533
534 /* Forward link the descriptor list */
535 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1;
536 i++, p++) {
537 p->des6 = (host->sg_dma +
538 (sizeof(struct idmac_desc_64addr) *
539 (i + 1))) & 0xffffffff;
540
541 p->des7 = (u64)(host->sg_dma +
542 (sizeof(struct idmac_desc_64addr) *
543 (i + 1))) >> 32;
544 /* Initialize reserved and buffer size fields to "0" */
545 p->des1 = 0;
546 p->des2 = 0;
547 p->des3 = 0;
548 }
549
550 /* Set the last descriptor as the end-of-ring descriptor */
551 p->des6 = host->sg_dma & 0xffffffff;
552 p->des7 = (u64)host->sg_dma >> 32;
553 p->des0 = IDMAC_DES0_ER;
554
555 } else {
556 struct idmac_desc *p;
557 /* Number of descriptors in the ring buffer */
558 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
559
560 /* Forward link the descriptor list */
561 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
562 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) *
563 (i + 1));
564
565 /* Set the last descriptor as the end-of-ring descriptor */
566 p->des3 = host->sg_dma;
567 p->des0 = IDMAC_DES0_ER;
568 }
569
570 dw_mci_idmac_reset(host);
571
572 if (host->dma_64bit_address == 1) {
573 /* Mask out interrupts - get Tx & Rx complete only */
574 mci_writel(host, IDSTS64, IDMAC_INT_CLR);
575 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI |
576 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
577
578 /* Set the descriptor base address */
579 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff);
580 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32);
581
582 } else {
583 /* Mask out interrupts - get Tx & Rx complete only */
584 mci_writel(host, IDSTS, IDMAC_INT_CLR);
585 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI |
586 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI);
587
588 /* Set the descriptor base address */
589 mci_writel(host, DBADDR, host->sg_dma);
590 }
591
592 return 0;
593 }
594
595 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
596 .init = dw_mci_idmac_init,
597 .start = dw_mci_idmac_start_dma,
598 .stop = dw_mci_idmac_stop_dma,
599 .complete = dw_mci_idmac_complete_dma,
600 .cleanup = dw_mci_dma_cleanup,
601 };
602 #endif /* CONFIG_MMC_DW_IDMAC */
603
604 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
605 struct mmc_data *data,
606 bool next)
607 {
608 struct scatterlist *sg;
609 unsigned int i, sg_len;
610
611 if (!next && data->host_cookie)
612 return data->host_cookie;
613
614 /*
615 * We don't do DMA on "complex" transfers, i.e. with
616 * non-word-aligned buffers or lengths. Also, we don't bother
617 * with all the DMA setup overhead for short transfers.
618 */
619 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
620 return -EINVAL;
621
622 if (data->blksz & 3)
623 return -EINVAL;
624
625 for_each_sg(data->sg, sg, data->sg_len, i) {
626 if (sg->offset & 3 || sg->length & 3)
627 return -EINVAL;
628 }
629
630 sg_len = dma_map_sg(host->dev,
631 data->sg,
632 data->sg_len,
633 dw_mci_get_dma_dir(data));
634 if (sg_len == 0)
635 return -EINVAL;
636
637 if (next)
638 data->host_cookie = sg_len;
639
640 return sg_len;
641 }
642
643 static void dw_mci_pre_req(struct mmc_host *mmc,
644 struct mmc_request *mrq,
645 bool is_first_req)
646 {
647 struct dw_mci_slot *slot = mmc_priv(mmc);
648 struct mmc_data *data = mrq->data;
649
650 if (!slot->host->use_dma || !data)
651 return;
652
653 if (data->host_cookie) {
654 data->host_cookie = 0;
655 return;
656 }
657
658 if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
659 data->host_cookie = 0;
660 }
661
662 static void dw_mci_post_req(struct mmc_host *mmc,
663 struct mmc_request *mrq,
664 int err)
665 {
666 struct dw_mci_slot *slot = mmc_priv(mmc);
667 struct mmc_data *data = mrq->data;
668
669 if (!slot->host->use_dma || !data)
670 return;
671
672 if (data->host_cookie)
673 dma_unmap_sg(slot->host->dev,
674 data->sg,
675 data->sg_len,
676 dw_mci_get_dma_dir(data));
677 data->host_cookie = 0;
678 }
679
680 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data)
681 {
682 #ifdef CONFIG_MMC_DW_IDMAC
683 unsigned int blksz = data->blksz;
684 const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256};
685 u32 fifo_width = 1 << host->data_shift;
686 u32 blksz_depth = blksz / fifo_width, fifoth_val;
687 u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers;
688 int idx = (sizeof(mszs) / sizeof(mszs[0])) - 1;
689
690 tx_wmark = (host->fifo_depth) / 2;
691 tx_wmark_invers = host->fifo_depth - tx_wmark;
692
693 /*
694 * MSIZE is '1',
695 * if blksz is not a multiple of the FIFO width
696 */
697 if (blksz % fifo_width) {
698 msize = 0;
699 rx_wmark = 1;
700 goto done;
701 }
702
703 do {
704 if (!((blksz_depth % mszs[idx]) ||
705 (tx_wmark_invers % mszs[idx]))) {
706 msize = idx;
707 rx_wmark = mszs[idx] - 1;
708 break;
709 }
710 } while (--idx > 0);
711 /*
712 * If idx is '0', it won't be tried
713 * Thus, initial values are uesed
714 */
715 done:
716 fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark);
717 mci_writel(host, FIFOTH, fifoth_val);
718 #endif
719 }
720
721 static void dw_mci_ctrl_rd_thld(struct dw_mci *host, struct mmc_data *data)
722 {
723 unsigned int blksz = data->blksz;
724 u32 blksz_depth, fifo_depth;
725 u16 thld_size;
726
727 WARN_ON(!(data->flags & MMC_DATA_READ));
728
729 /*
730 * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is
731 * in the FIFO region, so we really shouldn't access it).
732 */
733 if (host->verid < DW_MMC_240A)
734 return;
735
736 if (host->timing != MMC_TIMING_MMC_HS200 &&
737 host->timing != MMC_TIMING_UHS_SDR104)
738 goto disable;
739
740 blksz_depth = blksz / (1 << host->data_shift);
741 fifo_depth = host->fifo_depth;
742
743 if (blksz_depth > fifo_depth)
744 goto disable;
745
746 /*
747 * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz'
748 * If (blksz_depth) < (fifo_depth >> 1), should be thld_size = blksz
749 * Currently just choose blksz.
750 */
751 thld_size = blksz;
752 mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(thld_size, 1));
753 return;
754
755 disable:
756 mci_writel(host, CDTHRCTL, SDMMC_SET_RD_THLD(0, 0));
757 }
758
759 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
760 {
761 int sg_len;
762 u32 temp;
763
764 host->using_dma = 0;
765
766 /* If we don't have a channel, we can't do DMA */
767 if (!host->use_dma)
768 return -ENODEV;
769
770 sg_len = dw_mci_pre_dma_transfer(host, data, 0);
771 if (sg_len < 0) {
772 host->dma_ops->stop(host);
773 return sg_len;
774 }
775
776 host->using_dma = 1;
777
778 dev_vdbg(host->dev,
779 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
780 (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
781 sg_len);
782
783 /*
784 * Decide the MSIZE and RX/TX Watermark.
785 * If current block size is same with previous size,
786 * no need to update fifoth.
787 */
788 if (host->prev_blksz != data->blksz)
789 dw_mci_adjust_fifoth(host, data);
790
791 /* Enable the DMA interface */
792 temp = mci_readl(host, CTRL);
793 temp |= SDMMC_CTRL_DMA_ENABLE;
794 mci_writel(host, CTRL, temp);
795
796 /* Disable RX/TX IRQs, let DMA handle it */
797 temp = mci_readl(host, INTMASK);
798 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
799 mci_writel(host, INTMASK, temp);
800
801 host->dma_ops->start(host, sg_len);
802
803 return 0;
804 }
805
806 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
807 {
808 u32 temp;
809
810 data->error = -EINPROGRESS;
811
812 WARN_ON(host->data);
813 host->sg = NULL;
814 host->data = data;
815
816 if (data->flags & MMC_DATA_READ) {
817 host->dir_status = DW_MCI_RECV_STATUS;
818 dw_mci_ctrl_rd_thld(host, data);
819 } else {
820 host->dir_status = DW_MCI_SEND_STATUS;
821 }
822
823 if (dw_mci_submit_data_dma(host, data)) {
824 int flags = SG_MITER_ATOMIC;
825 if (host->data->flags & MMC_DATA_READ)
826 flags |= SG_MITER_TO_SG;
827 else
828 flags |= SG_MITER_FROM_SG;
829
830 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
831 host->sg = data->sg;
832 host->part_buf_start = 0;
833 host->part_buf_count = 0;
834
835 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
836 temp = mci_readl(host, INTMASK);
837 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
838 mci_writel(host, INTMASK, temp);
839
840 temp = mci_readl(host, CTRL);
841 temp &= ~SDMMC_CTRL_DMA_ENABLE;
842 mci_writel(host, CTRL, temp);
843
844 /*
845 * Use the initial fifoth_val for PIO mode.
846 * If next issued data may be transfered by DMA mode,
847 * prev_blksz should be invalidated.
848 */
849 mci_writel(host, FIFOTH, host->fifoth_val);
850 host->prev_blksz = 0;
851 } else {
852 /*
853 * Keep the current block size.
854 * It will be used to decide whether to update
855 * fifoth register next time.
856 */
857 host->prev_blksz = data->blksz;
858 }
859 }
860
861 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
862 {
863 struct dw_mci *host = slot->host;
864 unsigned long timeout = jiffies + msecs_to_jiffies(500);
865 unsigned int cmd_status = 0;
866
867 mci_writel(host, CMDARG, arg);
868 wmb();
869 mci_writel(host, CMD, SDMMC_CMD_START | cmd);
870
871 while (time_before(jiffies, timeout)) {
872 cmd_status = mci_readl(host, CMD);
873 if (!(cmd_status & SDMMC_CMD_START))
874 return;
875 }
876 dev_err(&slot->mmc->class_dev,
877 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
878 cmd, arg, cmd_status);
879 }
880
881 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
882 {
883 struct dw_mci *host = slot->host;
884 unsigned int clock = slot->clock;
885 u32 div;
886 u32 clk_en_a;
887 u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
888
889 /* We must continue to set bit 28 in CMD until the change is complete */
890 if (host->state == STATE_WAITING_CMD11_DONE)
891 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
892
893 if (!clock) {
894 mci_writel(host, CLKENA, 0);
895 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
896 } else if (clock != host->current_speed || force_clkinit) {
897 div = host->bus_hz / clock;
898 if (host->bus_hz % clock && host->bus_hz > clock)
899 /*
900 * move the + 1 after the divide to prevent
901 * over-clocking the card.
902 */
903 div += 1;
904
905 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0;
906
907 if ((clock << div) != slot->__clk_old || force_clkinit)
908 dev_info(&slot->mmc->class_dev,
909 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n",
910 slot->id, host->bus_hz, clock,
911 div ? ((host->bus_hz / div) >> 1) :
912 host->bus_hz, div);
913
914 /* disable clock */
915 mci_writel(host, CLKENA, 0);
916 mci_writel(host, CLKSRC, 0);
917
918 /* inform CIU */
919 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
920
921 /* set clock to desired speed */
922 mci_writel(host, CLKDIV, div);
923
924 /* inform CIU */
925 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
926
927 /* enable clock; only low power if no SDIO */
928 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
929 if (!(mci_readl(host, INTMASK) & SDMMC_INT_SDIO(slot->sdio_id)))
930 clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
931 mci_writel(host, CLKENA, clk_en_a);
932
933 /* inform CIU */
934 mci_send_cmd(slot, sdmmc_cmd_bits, 0);
935
936 /* keep the clock with reflecting clock dividor */
937 slot->__clk_old = clock << div;
938 }
939
940 host->current_speed = clock;
941
942 /* Set the current slot bus width */
943 mci_writel(host, CTYPE, (slot->ctype << slot->id));
944 }
945
946 static void __dw_mci_start_request(struct dw_mci *host,
947 struct dw_mci_slot *slot,
948 struct mmc_command *cmd)
949 {
950 struct mmc_request *mrq;
951 struct mmc_data *data;
952 u32 cmdflags;
953
954 mrq = slot->mrq;
955
956 host->cur_slot = slot;
957 host->mrq = mrq;
958
959 host->pending_events = 0;
960 host->completed_events = 0;
961 host->cmd_status = 0;
962 host->data_status = 0;
963 host->dir_status = 0;
964
965 data = cmd->data;
966 if (data) {
967 mci_writel(host, TMOUT, 0xFFFFFFFF);
968 mci_writel(host, BYTCNT, data->blksz*data->blocks);
969 mci_writel(host, BLKSIZ, data->blksz);
970 }
971
972 cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
973
974 /* this is the first command, send the initialization clock */
975 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
976 cmdflags |= SDMMC_CMD_INIT;
977
978 if (data) {
979 dw_mci_submit_data(host, data);
980 wmb();
981 }
982
983 dw_mci_start_command(host, cmd, cmdflags);
984
985 if (mrq->stop)
986 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
987 else
988 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd);
989 }
990
991 static void dw_mci_start_request(struct dw_mci *host,
992 struct dw_mci_slot *slot)
993 {
994 struct mmc_request *mrq = slot->mrq;
995 struct mmc_command *cmd;
996
997 cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
998 __dw_mci_start_request(host, slot, cmd);
999 }
1000
1001 /* must be called with host->lock held */
1002 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
1003 struct mmc_request *mrq)
1004 {
1005 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1006 host->state);
1007
1008 slot->mrq = mrq;
1009
1010 if (host->state == STATE_WAITING_CMD11_DONE) {
1011 dev_warn(&slot->mmc->class_dev,
1012 "Voltage change didn't complete\n");
1013 /*
1014 * this case isn't expected to happen, so we can
1015 * either crash here or just try to continue on
1016 * in the closest possible state
1017 */
1018 host->state = STATE_IDLE;
1019 }
1020
1021 if (host->state == STATE_IDLE) {
1022 host->state = STATE_SENDING_CMD;
1023 dw_mci_start_request(host, slot);
1024 } else {
1025 list_add_tail(&slot->queue_node, &host->queue);
1026 }
1027 }
1028
1029 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1030 {
1031 struct dw_mci_slot *slot = mmc_priv(mmc);
1032 struct dw_mci *host = slot->host;
1033
1034 WARN_ON(slot->mrq);
1035
1036 /*
1037 * The check for card presence and queueing of the request must be
1038 * atomic, otherwise the card could be removed in between and the
1039 * request wouldn't fail until another card was inserted.
1040 */
1041 spin_lock_bh(&host->lock);
1042
1043 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
1044 spin_unlock_bh(&host->lock);
1045 mrq->cmd->error = -ENOMEDIUM;
1046 mmc_request_done(mmc, mrq);
1047 return;
1048 }
1049
1050 dw_mci_queue_request(host, slot, mrq);
1051
1052 spin_unlock_bh(&host->lock);
1053 }
1054
1055 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1056 {
1057 struct dw_mci_slot *slot = mmc_priv(mmc);
1058 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
1059 u32 regs;
1060 int ret;
1061
1062 switch (ios->bus_width) {
1063 case MMC_BUS_WIDTH_4:
1064 slot->ctype = SDMMC_CTYPE_4BIT;
1065 break;
1066 case MMC_BUS_WIDTH_8:
1067 slot->ctype = SDMMC_CTYPE_8BIT;
1068 break;
1069 default:
1070 /* set default 1 bit mode */
1071 slot->ctype = SDMMC_CTYPE_1BIT;
1072 }
1073
1074 regs = mci_readl(slot->host, UHS_REG);
1075
1076 /* DDR mode set */
1077 if (ios->timing == MMC_TIMING_MMC_DDR52)
1078 regs |= ((0x1 << slot->id) << 16);
1079 else
1080 regs &= ~((0x1 << slot->id) << 16);
1081
1082 mci_writel(slot->host, UHS_REG, regs);
1083 slot->host->timing = ios->timing;
1084
1085 /*
1086 * Use mirror of ios->clock to prevent race with mmc
1087 * core ios update when finding the minimum.
1088 */
1089 slot->clock = ios->clock;
1090
1091 if (drv_data && drv_data->set_ios)
1092 drv_data->set_ios(slot->host, ios);
1093
1094 /* Slot specific timing and width adjustment */
1095 dw_mci_setup_bus(slot, false);
1096
1097 if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0)
1098 slot->host->state = STATE_IDLE;
1099
1100 switch (ios->power_mode) {
1101 case MMC_POWER_UP:
1102 if (!IS_ERR(mmc->supply.vmmc)) {
1103 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
1104 ios->vdd);
1105 if (ret) {
1106 dev_err(slot->host->dev,
1107 "failed to enable vmmc regulator\n");
1108 /*return, if failed turn on vmmc*/
1109 return;
1110 }
1111 }
1112 if (!IS_ERR(mmc->supply.vqmmc) && !slot->host->vqmmc_enabled) {
1113 ret = regulator_enable(mmc->supply.vqmmc);
1114 if (ret < 0)
1115 dev_err(slot->host->dev,
1116 "failed to enable vqmmc regulator\n");
1117 else
1118 slot->host->vqmmc_enabled = true;
1119 }
1120 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
1121 regs = mci_readl(slot->host, PWREN);
1122 regs |= (1 << slot->id);
1123 mci_writel(slot->host, PWREN, regs);
1124 break;
1125 case MMC_POWER_OFF:
1126 if (!IS_ERR(mmc->supply.vmmc))
1127 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1128
1129 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) {
1130 regulator_disable(mmc->supply.vqmmc);
1131 slot->host->vqmmc_enabled = false;
1132 }
1133
1134 regs = mci_readl(slot->host, PWREN);
1135 regs &= ~(1 << slot->id);
1136 mci_writel(slot->host, PWREN, regs);
1137 break;
1138 default:
1139 break;
1140 }
1141 }
1142
1143 static int dw_mci_card_busy(struct mmc_host *mmc)
1144 {
1145 struct dw_mci_slot *slot = mmc_priv(mmc);
1146 u32 status;
1147
1148 /*
1149 * Check the busy bit which is low when DAT[3:0]
1150 * (the data lines) are 0000
1151 */
1152 status = mci_readl(slot->host, STATUS);
1153
1154 return !!(status & SDMMC_STATUS_BUSY);
1155 }
1156
1157 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
1158 {
1159 struct dw_mci_slot *slot = mmc_priv(mmc);
1160 struct dw_mci *host = slot->host;
1161 u32 uhs;
1162 u32 v18 = SDMMC_UHS_18V << slot->id;
1163 int min_uv, max_uv;
1164 int ret;
1165
1166 /*
1167 * Program the voltage. Note that some instances of dw_mmc may use
1168 * the UHS_REG for this. For other instances (like exynos) the UHS_REG
1169 * does no harm but you need to set the regulator directly. Try both.
1170 */
1171 uhs = mci_readl(host, UHS_REG);
1172 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1173 min_uv = 2700000;
1174 max_uv = 3600000;
1175 uhs &= ~v18;
1176 } else {
1177 min_uv = 1700000;
1178 max_uv = 1950000;
1179 uhs |= v18;
1180 }
1181 if (!IS_ERR(mmc->supply.vqmmc)) {
1182 ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
1183
1184 if (ret) {
1185 dev_dbg(&mmc->class_dev,
1186 "Regulator set error %d: %d - %d\n",
1187 ret, min_uv, max_uv);
1188 return ret;
1189 }
1190 }
1191 mci_writel(host, UHS_REG, uhs);
1192
1193 return 0;
1194 }
1195
1196 static int dw_mci_get_ro(struct mmc_host *mmc)
1197 {
1198 int read_only;
1199 struct dw_mci_slot *slot = mmc_priv(mmc);
1200 int gpio_ro = mmc_gpio_get_ro(mmc);
1201
1202 /* Use platform get_ro function, else try on board write protect */
1203 if ((slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT) ||
1204 (slot->host->quirks & DW_MCI_QUIRK_NO_WRITE_PROTECT))
1205 read_only = 0;
1206 else if (!IS_ERR_VALUE(gpio_ro))
1207 read_only = gpio_ro;
1208 else
1209 read_only =
1210 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
1211
1212 dev_dbg(&mmc->class_dev, "card is %s\n",
1213 read_only ? "read-only" : "read-write");
1214
1215 return read_only;
1216 }
1217
1218 static int dw_mci_get_cd(struct mmc_host *mmc)
1219 {
1220 int present;
1221 struct dw_mci_slot *slot = mmc_priv(mmc);
1222 struct dw_mci_board *brd = slot->host->pdata;
1223 struct dw_mci *host = slot->host;
1224 int gpio_cd = mmc_gpio_get_cd(mmc);
1225
1226 /* Use platform get_cd function, else try onboard card detect */
1227 if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
1228 present = 1;
1229 else if (!IS_ERR_VALUE(gpio_cd))
1230 present = gpio_cd;
1231 else
1232 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
1233 == 0 ? 1 : 0;
1234
1235 spin_lock_bh(&host->lock);
1236 if (present) {
1237 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1238 dev_dbg(&mmc->class_dev, "card is present\n");
1239 } else {
1240 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1241 dev_dbg(&mmc->class_dev, "card is not present\n");
1242 }
1243 spin_unlock_bh(&host->lock);
1244
1245 return present;
1246 }
1247
1248 /*
1249 * Disable lower power mode.
1250 *
1251 * Low power mode will stop the card clock when idle. According to the
1252 * description of the CLKENA register we should disable low power mode
1253 * for SDIO cards if we need SDIO interrupts to work.
1254 *
1255 * This function is fast if low power mode is already disabled.
1256 */
1257 static void dw_mci_disable_low_power(struct dw_mci_slot *slot)
1258 {
1259 struct dw_mci *host = slot->host;
1260 u32 clk_en_a;
1261 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
1262
1263 clk_en_a = mci_readl(host, CLKENA);
1264
1265 if (clk_en_a & clken_low_pwr) {
1266 mci_writel(host, CLKENA, clk_en_a & ~clken_low_pwr);
1267 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
1268 SDMMC_CMD_PRV_DAT_WAIT, 0);
1269 }
1270 }
1271
1272 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
1273 {
1274 struct dw_mci_slot *slot = mmc_priv(mmc);
1275 struct dw_mci *host = slot->host;
1276 u32 int_mask;
1277
1278 /* Enable/disable Slot Specific SDIO interrupt */
1279 int_mask = mci_readl(host, INTMASK);
1280 if (enb) {
1281 /*
1282 * Turn off low power mode if it was enabled. This is a bit of
1283 * a heavy operation and we disable / enable IRQs a lot, so
1284 * we'll leave low power mode disabled and it will get
1285 * re-enabled again in dw_mci_setup_bus().
1286 */
1287 dw_mci_disable_low_power(slot);
1288
1289 mci_writel(host, INTMASK,
1290 (int_mask | SDMMC_INT_SDIO(slot->sdio_id)));
1291 } else {
1292 mci_writel(host, INTMASK,
1293 (int_mask & ~SDMMC_INT_SDIO(slot->sdio_id)));
1294 }
1295 }
1296
1297 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1298 {
1299 struct dw_mci_slot *slot = mmc_priv(mmc);
1300 struct dw_mci *host = slot->host;
1301 const struct dw_mci_drv_data *drv_data = host->drv_data;
1302 struct dw_mci_tuning_data tuning_data;
1303 int err = -ENOSYS;
1304
1305 if (opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1306 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
1307 tuning_data.blk_pattern = tuning_blk_pattern_8bit;
1308 tuning_data.blksz = sizeof(tuning_blk_pattern_8bit);
1309 } else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
1310 tuning_data.blk_pattern = tuning_blk_pattern_4bit;
1311 tuning_data.blksz = sizeof(tuning_blk_pattern_4bit);
1312 } else {
1313 return -EINVAL;
1314 }
1315 } else if (opcode == MMC_SEND_TUNING_BLOCK) {
1316 tuning_data.blk_pattern = tuning_blk_pattern_4bit;
1317 tuning_data.blksz = sizeof(tuning_blk_pattern_4bit);
1318 } else {
1319 dev_err(host->dev,
1320 "Undefined command(%d) for tuning\n", opcode);
1321 return -EINVAL;
1322 }
1323
1324 if (drv_data && drv_data->execute_tuning)
1325 err = drv_data->execute_tuning(slot, opcode, &tuning_data);
1326 return err;
1327 }
1328
1329 static const struct mmc_host_ops dw_mci_ops = {
1330 .request = dw_mci_request,
1331 .pre_req = dw_mci_pre_req,
1332 .post_req = dw_mci_post_req,
1333 .set_ios = dw_mci_set_ios,
1334 .get_ro = dw_mci_get_ro,
1335 .get_cd = dw_mci_get_cd,
1336 .enable_sdio_irq = dw_mci_enable_sdio_irq,
1337 .execute_tuning = dw_mci_execute_tuning,
1338 .card_busy = dw_mci_card_busy,
1339 .start_signal_voltage_switch = dw_mci_switch_voltage,
1340
1341 };
1342
1343 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
1344 __releases(&host->lock)
1345 __acquires(&host->lock)
1346 {
1347 struct dw_mci_slot *slot;
1348 struct mmc_host *prev_mmc = host->cur_slot->mmc;
1349
1350 WARN_ON(host->cmd || host->data);
1351
1352 host->cur_slot->mrq = NULL;
1353 host->mrq = NULL;
1354 if (!list_empty(&host->queue)) {
1355 slot = list_entry(host->queue.next,
1356 struct dw_mci_slot, queue_node);
1357 list_del(&slot->queue_node);
1358 dev_vdbg(host->dev, "list not empty: %s is next\n",
1359 mmc_hostname(slot->mmc));
1360 host->state = STATE_SENDING_CMD;
1361 dw_mci_start_request(host, slot);
1362 } else {
1363 dev_vdbg(host->dev, "list empty\n");
1364
1365 if (host->state == STATE_SENDING_CMD11)
1366 host->state = STATE_WAITING_CMD11_DONE;
1367 else
1368 host->state = STATE_IDLE;
1369 }
1370
1371 spin_unlock(&host->lock);
1372 mmc_request_done(prev_mmc, mrq);
1373 spin_lock(&host->lock);
1374 }
1375
1376 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
1377 {
1378 u32 status = host->cmd_status;
1379
1380 host->cmd_status = 0;
1381
1382 /* Read the response from the card (up to 16 bytes) */
1383 if (cmd->flags & MMC_RSP_PRESENT) {
1384 if (cmd->flags & MMC_RSP_136) {
1385 cmd->resp[3] = mci_readl(host, RESP0);
1386 cmd->resp[2] = mci_readl(host, RESP1);
1387 cmd->resp[1] = mci_readl(host, RESP2);
1388 cmd->resp[0] = mci_readl(host, RESP3);
1389 } else {
1390 cmd->resp[0] = mci_readl(host, RESP0);
1391 cmd->resp[1] = 0;
1392 cmd->resp[2] = 0;
1393 cmd->resp[3] = 0;
1394 }
1395 }
1396
1397 if (status & SDMMC_INT_RTO)
1398 cmd->error = -ETIMEDOUT;
1399 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1400 cmd->error = -EILSEQ;
1401 else if (status & SDMMC_INT_RESP_ERR)
1402 cmd->error = -EIO;
1403 else
1404 cmd->error = 0;
1405
1406 if (cmd->error) {
1407 /* newer ip versions need a delay between retries */
1408 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
1409 mdelay(20);
1410 }
1411
1412 return cmd->error;
1413 }
1414
1415 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
1416 {
1417 u32 status = host->data_status;
1418
1419 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1420 if (status & SDMMC_INT_DRTO) {
1421 data->error = -ETIMEDOUT;
1422 } else if (status & SDMMC_INT_DCRC) {
1423 data->error = -EILSEQ;
1424 } else if (status & SDMMC_INT_EBE) {
1425 if (host->dir_status ==
1426 DW_MCI_SEND_STATUS) {
1427 /*
1428 * No data CRC status was returned.
1429 * The number of bytes transferred
1430 * will be exaggerated in PIO mode.
1431 */
1432 data->bytes_xfered = 0;
1433 data->error = -ETIMEDOUT;
1434 } else if (host->dir_status ==
1435 DW_MCI_RECV_STATUS) {
1436 data->error = -EIO;
1437 }
1438 } else {
1439 /* SDMMC_INT_SBE is included */
1440 data->error = -EIO;
1441 }
1442
1443 dev_dbg(host->dev, "data error, status 0x%08x\n", status);
1444
1445 /*
1446 * After an error, there may be data lingering
1447 * in the FIFO
1448 */
1449 dw_mci_reset(host);
1450 } else {
1451 data->bytes_xfered = data->blocks * data->blksz;
1452 data->error = 0;
1453 }
1454
1455 return data->error;
1456 }
1457
1458 static void dw_mci_tasklet_func(unsigned long priv)
1459 {
1460 struct dw_mci *host = (struct dw_mci *)priv;
1461 struct mmc_data *data;
1462 struct mmc_command *cmd;
1463 struct mmc_request *mrq;
1464 enum dw_mci_state state;
1465 enum dw_mci_state prev_state;
1466 unsigned int err;
1467
1468 spin_lock(&host->lock);
1469
1470 state = host->state;
1471 data = host->data;
1472 mrq = host->mrq;
1473
1474 do {
1475 prev_state = state;
1476
1477 switch (state) {
1478 case STATE_IDLE:
1479 case STATE_WAITING_CMD11_DONE:
1480 break;
1481
1482 case STATE_SENDING_CMD11:
1483 case STATE_SENDING_CMD:
1484 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1485 &host->pending_events))
1486 break;
1487
1488 cmd = host->cmd;
1489 host->cmd = NULL;
1490 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1491 err = dw_mci_command_complete(host, cmd);
1492 if (cmd == mrq->sbc && !err) {
1493 prev_state = state = STATE_SENDING_CMD;
1494 __dw_mci_start_request(host, host->cur_slot,
1495 mrq->cmd);
1496 goto unlock;
1497 }
1498
1499 if (cmd->data && err) {
1500 dw_mci_stop_dma(host);
1501 send_stop_abort(host, data);
1502 state = STATE_SENDING_STOP;
1503 break;
1504 }
1505
1506 if (!cmd->data || err) {
1507 dw_mci_request_end(host, mrq);
1508 goto unlock;
1509 }
1510
1511 prev_state = state = STATE_SENDING_DATA;
1512 /* fall through */
1513
1514 case STATE_SENDING_DATA:
1515 /*
1516 * We could get a data error and never a transfer
1517 * complete so we'd better check for it here.
1518 *
1519 * Note that we don't really care if we also got a
1520 * transfer complete; stopping the DMA and sending an
1521 * abort won't hurt.
1522 */
1523 if (test_and_clear_bit(EVENT_DATA_ERROR,
1524 &host->pending_events)) {
1525 dw_mci_stop_dma(host);
1526 send_stop_abort(host, data);
1527 state = STATE_DATA_ERROR;
1528 break;
1529 }
1530
1531 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1532 &host->pending_events))
1533 break;
1534
1535 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1536
1537 /*
1538 * Handle an EVENT_DATA_ERROR that might have shown up
1539 * before the transfer completed. This might not have
1540 * been caught by the check above because the interrupt
1541 * could have gone off between the previous check and
1542 * the check for transfer complete.
1543 *
1544 * Technically this ought not be needed assuming we
1545 * get a DATA_COMPLETE eventually (we'll notice the
1546 * error and end the request), but it shouldn't hurt.
1547 *
1548 * This has the advantage of sending the stop command.
1549 */
1550 if (test_and_clear_bit(EVENT_DATA_ERROR,
1551 &host->pending_events)) {
1552 dw_mci_stop_dma(host);
1553 send_stop_abort(host, data);
1554 state = STATE_DATA_ERROR;
1555 break;
1556 }
1557 prev_state = state = STATE_DATA_BUSY;
1558
1559 /* fall through */
1560
1561 case STATE_DATA_BUSY:
1562 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1563 &host->pending_events))
1564 break;
1565
1566 host->data = NULL;
1567 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1568 err = dw_mci_data_complete(host, data);
1569
1570 if (!err) {
1571 if (!data->stop || mrq->sbc) {
1572 if (mrq->sbc && data->stop)
1573 data->stop->error = 0;
1574 dw_mci_request_end(host, mrq);
1575 goto unlock;
1576 }
1577
1578 /* stop command for open-ended transfer*/
1579 if (data->stop)
1580 send_stop_abort(host, data);
1581 } else {
1582 /*
1583 * If we don't have a command complete now we'll
1584 * never get one since we just reset everything;
1585 * better end the request.
1586 *
1587 * If we do have a command complete we'll fall
1588 * through to the SENDING_STOP command and
1589 * everything will be peachy keen.
1590 */
1591 if (!test_bit(EVENT_CMD_COMPLETE,
1592 &host->pending_events)) {
1593 host->cmd = NULL;
1594 dw_mci_request_end(host, mrq);
1595 goto unlock;
1596 }
1597 }
1598
1599 /*
1600 * If err has non-zero,
1601 * stop-abort command has been already issued.
1602 */
1603 prev_state = state = STATE_SENDING_STOP;
1604
1605 /* fall through */
1606
1607 case STATE_SENDING_STOP:
1608 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1609 &host->pending_events))
1610 break;
1611
1612 /* CMD error in data command */
1613 if (mrq->cmd->error && mrq->data)
1614 dw_mci_reset(host);
1615
1616 host->cmd = NULL;
1617 host->data = NULL;
1618
1619 if (mrq->stop)
1620 dw_mci_command_complete(host, mrq->stop);
1621 else
1622 host->cmd_status = 0;
1623
1624 dw_mci_request_end(host, mrq);
1625 goto unlock;
1626
1627 case STATE_DATA_ERROR:
1628 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1629 &host->pending_events))
1630 break;
1631
1632 state = STATE_DATA_BUSY;
1633 break;
1634 }
1635 } while (state != prev_state);
1636
1637 host->state = state;
1638 unlock:
1639 spin_unlock(&host->lock);
1640
1641 }
1642
1643 /* push final bytes to part_buf, only use during push */
1644 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1645 {
1646 memcpy((void *)&host->part_buf, buf, cnt);
1647 host->part_buf_count = cnt;
1648 }
1649
1650 /* append bytes to part_buf, only use during push */
1651 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1652 {
1653 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1654 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1655 host->part_buf_count += cnt;
1656 return cnt;
1657 }
1658
1659 /* pull first bytes from part_buf, only use during pull */
1660 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1661 {
1662 cnt = min(cnt, (int)host->part_buf_count);
1663 if (cnt) {
1664 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1665 cnt);
1666 host->part_buf_count -= cnt;
1667 host->part_buf_start += cnt;
1668 }
1669 return cnt;
1670 }
1671
1672 /* pull final bytes from the part_buf, assuming it's just been filled */
1673 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1674 {
1675 memcpy(buf, &host->part_buf, cnt);
1676 host->part_buf_start = cnt;
1677 host->part_buf_count = (1 << host->data_shift) - cnt;
1678 }
1679
1680 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1681 {
1682 struct mmc_data *data = host->data;
1683 int init_cnt = cnt;
1684
1685 /* try and push anything in the part_buf */
1686 if (unlikely(host->part_buf_count)) {
1687 int len = dw_mci_push_part_bytes(host, buf, cnt);
1688 buf += len;
1689 cnt -= len;
1690 if (host->part_buf_count == 2) {
1691 mci_writew(host, DATA(host->data_offset),
1692 host->part_buf16);
1693 host->part_buf_count = 0;
1694 }
1695 }
1696 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1697 if (unlikely((unsigned long)buf & 0x1)) {
1698 while (cnt >= 2) {
1699 u16 aligned_buf[64];
1700 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1701 int items = len >> 1;
1702 int i;
1703 /* memcpy from input buffer into aligned buffer */
1704 memcpy(aligned_buf, buf, len);
1705 buf += len;
1706 cnt -= len;
1707 /* push data from aligned buffer into fifo */
1708 for (i = 0; i < items; ++i)
1709 mci_writew(host, DATA(host->data_offset),
1710 aligned_buf[i]);
1711 }
1712 } else
1713 #endif
1714 {
1715 u16 *pdata = buf;
1716 for (; cnt >= 2; cnt -= 2)
1717 mci_writew(host, DATA(host->data_offset), *pdata++);
1718 buf = pdata;
1719 }
1720 /* put anything remaining in the part_buf */
1721 if (cnt) {
1722 dw_mci_set_part_bytes(host, buf, cnt);
1723 /* Push data if we have reached the expected data length */
1724 if ((data->bytes_xfered + init_cnt) ==
1725 (data->blksz * data->blocks))
1726 mci_writew(host, DATA(host->data_offset),
1727 host->part_buf16);
1728 }
1729 }
1730
1731 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1732 {
1733 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1734 if (unlikely((unsigned long)buf & 0x1)) {
1735 while (cnt >= 2) {
1736 /* pull data from fifo into aligned buffer */
1737 u16 aligned_buf[64];
1738 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1739 int items = len >> 1;
1740 int i;
1741 for (i = 0; i < items; ++i)
1742 aligned_buf[i] = mci_readw(host,
1743 DATA(host->data_offset));
1744 /* memcpy from aligned buffer into output buffer */
1745 memcpy(buf, aligned_buf, len);
1746 buf += len;
1747 cnt -= len;
1748 }
1749 } else
1750 #endif
1751 {
1752 u16 *pdata = buf;
1753 for (; cnt >= 2; cnt -= 2)
1754 *pdata++ = mci_readw(host, DATA(host->data_offset));
1755 buf = pdata;
1756 }
1757 if (cnt) {
1758 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1759 dw_mci_pull_final_bytes(host, buf, cnt);
1760 }
1761 }
1762
1763 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1764 {
1765 struct mmc_data *data = host->data;
1766 int init_cnt = cnt;
1767
1768 /* try and push anything in the part_buf */
1769 if (unlikely(host->part_buf_count)) {
1770 int len = dw_mci_push_part_bytes(host, buf, cnt);
1771 buf += len;
1772 cnt -= len;
1773 if (host->part_buf_count == 4) {
1774 mci_writel(host, DATA(host->data_offset),
1775 host->part_buf32);
1776 host->part_buf_count = 0;
1777 }
1778 }
1779 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1780 if (unlikely((unsigned long)buf & 0x3)) {
1781 while (cnt >= 4) {
1782 u32 aligned_buf[32];
1783 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1784 int items = len >> 2;
1785 int i;
1786 /* memcpy from input buffer into aligned buffer */
1787 memcpy(aligned_buf, buf, len);
1788 buf += len;
1789 cnt -= len;
1790 /* push data from aligned buffer into fifo */
1791 for (i = 0; i < items; ++i)
1792 mci_writel(host, DATA(host->data_offset),
1793 aligned_buf[i]);
1794 }
1795 } else
1796 #endif
1797 {
1798 u32 *pdata = buf;
1799 for (; cnt >= 4; cnt -= 4)
1800 mci_writel(host, DATA(host->data_offset), *pdata++);
1801 buf = pdata;
1802 }
1803 /* put anything remaining in the part_buf */
1804 if (cnt) {
1805 dw_mci_set_part_bytes(host, buf, cnt);
1806 /* Push data if we have reached the expected data length */
1807 if ((data->bytes_xfered + init_cnt) ==
1808 (data->blksz * data->blocks))
1809 mci_writel(host, DATA(host->data_offset),
1810 host->part_buf32);
1811 }
1812 }
1813
1814 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1815 {
1816 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1817 if (unlikely((unsigned long)buf & 0x3)) {
1818 while (cnt >= 4) {
1819 /* pull data from fifo into aligned buffer */
1820 u32 aligned_buf[32];
1821 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1822 int items = len >> 2;
1823 int i;
1824 for (i = 0; i < items; ++i)
1825 aligned_buf[i] = mci_readl(host,
1826 DATA(host->data_offset));
1827 /* memcpy from aligned buffer into output buffer */
1828 memcpy(buf, aligned_buf, len);
1829 buf += len;
1830 cnt -= len;
1831 }
1832 } else
1833 #endif
1834 {
1835 u32 *pdata = buf;
1836 for (; cnt >= 4; cnt -= 4)
1837 *pdata++ = mci_readl(host, DATA(host->data_offset));
1838 buf = pdata;
1839 }
1840 if (cnt) {
1841 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1842 dw_mci_pull_final_bytes(host, buf, cnt);
1843 }
1844 }
1845
1846 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1847 {
1848 struct mmc_data *data = host->data;
1849 int init_cnt = cnt;
1850
1851 /* try and push anything in the part_buf */
1852 if (unlikely(host->part_buf_count)) {
1853 int len = dw_mci_push_part_bytes(host, buf, cnt);
1854 buf += len;
1855 cnt -= len;
1856
1857 if (host->part_buf_count == 8) {
1858 mci_writeq(host, DATA(host->data_offset),
1859 host->part_buf);
1860 host->part_buf_count = 0;
1861 }
1862 }
1863 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1864 if (unlikely((unsigned long)buf & 0x7)) {
1865 while (cnt >= 8) {
1866 u64 aligned_buf[16];
1867 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1868 int items = len >> 3;
1869 int i;
1870 /* memcpy from input buffer into aligned buffer */
1871 memcpy(aligned_buf, buf, len);
1872 buf += len;
1873 cnt -= len;
1874 /* push data from aligned buffer into fifo */
1875 for (i = 0; i < items; ++i)
1876 mci_writeq(host, DATA(host->data_offset),
1877 aligned_buf[i]);
1878 }
1879 } else
1880 #endif
1881 {
1882 u64 *pdata = buf;
1883 for (; cnt >= 8; cnt -= 8)
1884 mci_writeq(host, DATA(host->data_offset), *pdata++);
1885 buf = pdata;
1886 }
1887 /* put anything remaining in the part_buf */
1888 if (cnt) {
1889 dw_mci_set_part_bytes(host, buf, cnt);
1890 /* Push data if we have reached the expected data length */
1891 if ((data->bytes_xfered + init_cnt) ==
1892 (data->blksz * data->blocks))
1893 mci_writeq(host, DATA(host->data_offset),
1894 host->part_buf);
1895 }
1896 }
1897
1898 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1899 {
1900 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1901 if (unlikely((unsigned long)buf & 0x7)) {
1902 while (cnt >= 8) {
1903 /* pull data from fifo into aligned buffer */
1904 u64 aligned_buf[16];
1905 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1906 int items = len >> 3;
1907 int i;
1908 for (i = 0; i < items; ++i)
1909 aligned_buf[i] = mci_readq(host,
1910 DATA(host->data_offset));
1911 /* memcpy from aligned buffer into output buffer */
1912 memcpy(buf, aligned_buf, len);
1913 buf += len;
1914 cnt -= len;
1915 }
1916 } else
1917 #endif
1918 {
1919 u64 *pdata = buf;
1920 for (; cnt >= 8; cnt -= 8)
1921 *pdata++ = mci_readq(host, DATA(host->data_offset));
1922 buf = pdata;
1923 }
1924 if (cnt) {
1925 host->part_buf = mci_readq(host, DATA(host->data_offset));
1926 dw_mci_pull_final_bytes(host, buf, cnt);
1927 }
1928 }
1929
1930 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1931 {
1932 int len;
1933
1934 /* get remaining partial bytes */
1935 len = dw_mci_pull_part_bytes(host, buf, cnt);
1936 if (unlikely(len == cnt))
1937 return;
1938 buf += len;
1939 cnt -= len;
1940
1941 /* get the rest of the data */
1942 host->pull_data(host, buf, cnt);
1943 }
1944
1945 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
1946 {
1947 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1948 void *buf;
1949 unsigned int offset;
1950 struct mmc_data *data = host->data;
1951 int shift = host->data_shift;
1952 u32 status;
1953 unsigned int len;
1954 unsigned int remain, fcnt;
1955
1956 do {
1957 if (!sg_miter_next(sg_miter))
1958 goto done;
1959
1960 host->sg = sg_miter->piter.sg;
1961 buf = sg_miter->addr;
1962 remain = sg_miter->length;
1963 offset = 0;
1964
1965 do {
1966 fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
1967 << shift) + host->part_buf_count;
1968 len = min(remain, fcnt);
1969 if (!len)
1970 break;
1971 dw_mci_pull_data(host, (void *)(buf + offset), len);
1972 data->bytes_xfered += len;
1973 offset += len;
1974 remain -= len;
1975 } while (remain);
1976
1977 sg_miter->consumed = offset;
1978 status = mci_readl(host, MINTSTS);
1979 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1980 /* if the RXDR is ready read again */
1981 } while ((status & SDMMC_INT_RXDR) ||
1982 (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
1983
1984 if (!remain) {
1985 if (!sg_miter_next(sg_miter))
1986 goto done;
1987 sg_miter->consumed = 0;
1988 }
1989 sg_miter_stop(sg_miter);
1990 return;
1991
1992 done:
1993 sg_miter_stop(sg_miter);
1994 host->sg = NULL;
1995 smp_wmb();
1996 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1997 }
1998
1999 static void dw_mci_write_data_pio(struct dw_mci *host)
2000 {
2001 struct sg_mapping_iter *sg_miter = &host->sg_miter;
2002 void *buf;
2003 unsigned int offset;
2004 struct mmc_data *data = host->data;
2005 int shift = host->data_shift;
2006 u32 status;
2007 unsigned int len;
2008 unsigned int fifo_depth = host->fifo_depth;
2009 unsigned int remain, fcnt;
2010
2011 do {
2012 if (!sg_miter_next(sg_miter))
2013 goto done;
2014
2015 host->sg = sg_miter->piter.sg;
2016 buf = sg_miter->addr;
2017 remain = sg_miter->length;
2018 offset = 0;
2019
2020 do {
2021 fcnt = ((fifo_depth -
2022 SDMMC_GET_FCNT(mci_readl(host, STATUS)))
2023 << shift) - host->part_buf_count;
2024 len = min(remain, fcnt);
2025 if (!len)
2026 break;
2027 host->push_data(host, (void *)(buf + offset), len);
2028 data->bytes_xfered += len;
2029 offset += len;
2030 remain -= len;
2031 } while (remain);
2032
2033 sg_miter->consumed = offset;
2034 status = mci_readl(host, MINTSTS);
2035 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2036 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
2037
2038 if (!remain) {
2039 if (!sg_miter_next(sg_miter))
2040 goto done;
2041 sg_miter->consumed = 0;
2042 }
2043 sg_miter_stop(sg_miter);
2044 return;
2045
2046 done:
2047 sg_miter_stop(sg_miter);
2048 host->sg = NULL;
2049 smp_wmb();
2050 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
2051 }
2052
2053 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
2054 {
2055 if (!host->cmd_status)
2056 host->cmd_status = status;
2057
2058 smp_wmb();
2059
2060 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2061 tasklet_schedule(&host->tasklet);
2062 }
2063
2064 static void dw_mci_handle_cd(struct dw_mci *host)
2065 {
2066 int i;
2067
2068 for (i = 0; i < host->num_slots; i++) {
2069 struct dw_mci_slot *slot = host->slot[i];
2070
2071 if (!slot)
2072 continue;
2073
2074 if (slot->mmc->ops->card_event)
2075 slot->mmc->ops->card_event(slot->mmc);
2076 mmc_detect_change(slot->mmc,
2077 msecs_to_jiffies(host->pdata->detect_delay_ms));
2078 }
2079 }
2080
2081 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
2082 {
2083 struct dw_mci *host = dev_id;
2084 u32 pending;
2085 int i;
2086
2087 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
2088
2089 /*
2090 * DTO fix - version 2.10a and below, and only if internal DMA
2091 * is configured.
2092 */
2093 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
2094 if (!pending &&
2095 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
2096 pending |= SDMMC_INT_DATA_OVER;
2097 }
2098
2099 if (pending) {
2100 /* Check volt switch first, since it can look like an error */
2101 if ((host->state == STATE_SENDING_CMD11) &&
2102 (pending & SDMMC_INT_VOLT_SWITCH)) {
2103 mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH);
2104 pending &= ~SDMMC_INT_VOLT_SWITCH;
2105 dw_mci_cmd_interrupt(host, pending);
2106 }
2107
2108 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
2109 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
2110 host->cmd_status = pending;
2111 smp_wmb();
2112 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
2113 }
2114
2115 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
2116 /* if there is an error report DATA_ERROR */
2117 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
2118 host->data_status = pending;
2119 smp_wmb();
2120 set_bit(EVENT_DATA_ERROR, &host->pending_events);
2121 tasklet_schedule(&host->tasklet);
2122 }
2123
2124 if (pending & SDMMC_INT_DATA_OVER) {
2125 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
2126 if (!host->data_status)
2127 host->data_status = pending;
2128 smp_wmb();
2129 if (host->dir_status == DW_MCI_RECV_STATUS) {
2130 if (host->sg != NULL)
2131 dw_mci_read_data_pio(host, true);
2132 }
2133 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
2134 tasklet_schedule(&host->tasklet);
2135 }
2136
2137 if (pending & SDMMC_INT_RXDR) {
2138 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
2139 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
2140 dw_mci_read_data_pio(host, false);
2141 }
2142
2143 if (pending & SDMMC_INT_TXDR) {
2144 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
2145 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
2146 dw_mci_write_data_pio(host);
2147 }
2148
2149 if (pending & SDMMC_INT_CMD_DONE) {
2150 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
2151 dw_mci_cmd_interrupt(host, pending);
2152 }
2153
2154 if (pending & SDMMC_INT_CD) {
2155 mci_writel(host, RINTSTS, SDMMC_INT_CD);
2156 dw_mci_handle_cd(host);
2157 }
2158
2159 /* Handle SDIO Interrupts */
2160 for (i = 0; i < host->num_slots; i++) {
2161 struct dw_mci_slot *slot = host->slot[i];
2162 if (pending & SDMMC_INT_SDIO(slot->sdio_id)) {
2163 mci_writel(host, RINTSTS,
2164 SDMMC_INT_SDIO(slot->sdio_id));
2165 mmc_signal_sdio_irq(slot->mmc);
2166 }
2167 }
2168
2169 }
2170
2171 #ifdef CONFIG_MMC_DW_IDMAC
2172 /* Handle DMA interrupts */
2173 if (host->dma_64bit_address == 1) {
2174 pending = mci_readl(host, IDSTS64);
2175 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2176 mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI |
2177 SDMMC_IDMAC_INT_RI);
2178 mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI);
2179 host->dma_ops->complete(host);
2180 }
2181 } else {
2182 pending = mci_readl(host, IDSTS);
2183 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
2184 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI |
2185 SDMMC_IDMAC_INT_RI);
2186 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
2187 host->dma_ops->complete(host);
2188 }
2189 }
2190 #endif
2191
2192 return IRQ_HANDLED;
2193 }
2194
2195 #ifdef CONFIG_OF
2196 /* given a slot id, find out the device node representing that slot */
2197 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
2198 {
2199 struct device_node *np;
2200 const __be32 *addr;
2201 int len;
2202
2203 if (!dev || !dev->of_node)
2204 return NULL;
2205
2206 for_each_child_of_node(dev->of_node, np) {
2207 addr = of_get_property(np, "reg", &len);
2208 if (!addr || (len < sizeof(int)))
2209 continue;
2210 if (be32_to_cpup(addr) == slot)
2211 return np;
2212 }
2213 return NULL;
2214 }
2215
2216 static struct dw_mci_of_slot_quirks {
2217 char *quirk;
2218 int id;
2219 } of_slot_quirks[] = {
2220 {
2221 .quirk = "disable-wp",
2222 .id = DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT,
2223 },
2224 };
2225
2226 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2227 {
2228 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
2229 int quirks = 0;
2230 int idx;
2231
2232 /* get quirks */
2233 for (idx = 0; idx < ARRAY_SIZE(of_slot_quirks); idx++)
2234 if (of_get_property(np, of_slot_quirks[idx].quirk, NULL)) {
2235 dev_warn(dev, "Slot quirk %s is deprecated\n",
2236 of_slot_quirks[idx].quirk);
2237 quirks |= of_slot_quirks[idx].id;
2238 }
2239
2240 return quirks;
2241 }
2242 #else /* CONFIG_OF */
2243 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
2244 {
2245 return 0;
2246 }
2247 #endif /* CONFIG_OF */
2248
2249 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
2250 {
2251 struct mmc_host *mmc;
2252 struct dw_mci_slot *slot;
2253 const struct dw_mci_drv_data *drv_data = host->drv_data;
2254 int ctrl_id, ret;
2255 u32 freq[2];
2256
2257 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
2258 if (!mmc)
2259 return -ENOMEM;
2260
2261 slot = mmc_priv(mmc);
2262 slot->id = id;
2263 slot->sdio_id = host->sdio_id0 + id;
2264 slot->mmc = mmc;
2265 slot->host = host;
2266 host->slot[id] = slot;
2267
2268 slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
2269
2270 mmc->ops = &dw_mci_ops;
2271 if (of_property_read_u32_array(host->dev->of_node,
2272 "clock-freq-min-max", freq, 2)) {
2273 mmc->f_min = DW_MCI_FREQ_MIN;
2274 mmc->f_max = DW_MCI_FREQ_MAX;
2275 } else {
2276 mmc->f_min = freq[0];
2277 mmc->f_max = freq[1];
2278 }
2279
2280 /*if there are external regulators, get them*/
2281 ret = mmc_regulator_get_supply(mmc);
2282 if (ret == -EPROBE_DEFER)
2283 goto err_host_allocated;
2284
2285 if (!mmc->ocr_avail)
2286 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2287
2288 if (host->pdata->caps)
2289 mmc->caps = host->pdata->caps;
2290
2291 if (host->pdata->pm_caps)
2292 mmc->pm_caps = host->pdata->pm_caps;
2293
2294 if (host->dev->of_node) {
2295 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
2296 if (ctrl_id < 0)
2297 ctrl_id = 0;
2298 } else {
2299 ctrl_id = to_platform_device(host->dev)->id;
2300 }
2301 if (drv_data && drv_data->caps)
2302 mmc->caps |= drv_data->caps[ctrl_id];
2303
2304 if (host->pdata->caps2)
2305 mmc->caps2 = host->pdata->caps2;
2306
2307 ret = mmc_of_parse(mmc);
2308 if (ret)
2309 goto err_host_allocated;
2310
2311 if (host->pdata->blk_settings) {
2312 mmc->max_segs = host->pdata->blk_settings->max_segs;
2313 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
2314 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
2315 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
2316 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
2317 } else {
2318 /* Useful defaults if platform data is unset. */
2319 #ifdef CONFIG_MMC_DW_IDMAC
2320 mmc->max_segs = host->ring_size;
2321 mmc->max_blk_size = 65536;
2322 mmc->max_blk_count = host->ring_size;
2323 mmc->max_seg_size = 0x1000;
2324 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
2325 #else
2326 mmc->max_segs = 64;
2327 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
2328 mmc->max_blk_count = 512;
2329 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2330 mmc->max_seg_size = mmc->max_req_size;
2331 #endif /* CONFIG_MMC_DW_IDMAC */
2332 }
2333
2334 if (dw_mci_get_cd(mmc))
2335 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2336 else
2337 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
2338
2339 ret = mmc_add_host(mmc);
2340 if (ret)
2341 goto err_host_allocated;
2342
2343 #if defined(CONFIG_DEBUG_FS)
2344 dw_mci_init_debugfs(slot);
2345 #endif
2346
2347 return 0;
2348
2349 err_host_allocated:
2350 mmc_free_host(mmc);
2351 return ret;
2352 }
2353
2354 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2355 {
2356 /* Debugfs stuff is cleaned up by mmc core */
2357 mmc_remove_host(slot->mmc);
2358 slot->host->slot[id] = NULL;
2359 mmc_free_host(slot->mmc);
2360 }
2361
2362 static void dw_mci_init_dma(struct dw_mci *host)
2363 {
2364 int addr_config;
2365 /* Check ADDR_CONFIG bit in HCON to find IDMAC address bus width */
2366 addr_config = (mci_readl(host, HCON) >> 27) & 0x01;
2367
2368 if (addr_config == 1) {
2369 /* host supports IDMAC in 64-bit address mode */
2370 host->dma_64bit_address = 1;
2371 dev_info(host->dev, "IDMAC supports 64-bit address mode.\n");
2372 if (!dma_set_mask(host->dev, DMA_BIT_MASK(64)))
2373 dma_set_coherent_mask(host->dev, DMA_BIT_MASK(64));
2374 } else {
2375 /* host supports IDMAC in 32-bit address mode */
2376 host->dma_64bit_address = 0;
2377 dev_info(host->dev, "IDMAC supports 32-bit address mode.\n");
2378 }
2379
2380 /* Alloc memory for sg translation */
2381 host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2382 &host->sg_dma, GFP_KERNEL);
2383 if (!host->sg_cpu) {
2384 dev_err(host->dev, "%s: could not alloc DMA memory\n",
2385 __func__);
2386 goto no_dma;
2387 }
2388
2389 /* Determine which DMA interface to use */
2390 #ifdef CONFIG_MMC_DW_IDMAC
2391 host->dma_ops = &dw_mci_idmac_ops;
2392 dev_info(host->dev, "Using internal DMA controller.\n");
2393 #endif
2394
2395 if (!host->dma_ops)
2396 goto no_dma;
2397
2398 if (host->dma_ops->init && host->dma_ops->start &&
2399 host->dma_ops->stop && host->dma_ops->cleanup) {
2400 if (host->dma_ops->init(host)) {
2401 dev_err(host->dev, "%s: Unable to initialize "
2402 "DMA Controller.\n", __func__);
2403 goto no_dma;
2404 }
2405 } else {
2406 dev_err(host->dev, "DMA initialization not found.\n");
2407 goto no_dma;
2408 }
2409
2410 host->use_dma = 1;
2411 return;
2412
2413 no_dma:
2414 dev_info(host->dev, "Using PIO mode.\n");
2415 host->use_dma = 0;
2416 return;
2417 }
2418
2419 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
2420 {
2421 unsigned long timeout = jiffies + msecs_to_jiffies(500);
2422 u32 ctrl;
2423
2424 ctrl = mci_readl(host, CTRL);
2425 ctrl |= reset;
2426 mci_writel(host, CTRL, ctrl);
2427
2428 /* wait till resets clear */
2429 do {
2430 ctrl = mci_readl(host, CTRL);
2431 if (!(ctrl & reset))
2432 return true;
2433 } while (time_before(jiffies, timeout));
2434
2435 dev_err(host->dev,
2436 "Timeout resetting block (ctrl reset %#x)\n",
2437 ctrl & reset);
2438
2439 return false;
2440 }
2441
2442 static bool dw_mci_reset(struct dw_mci *host)
2443 {
2444 u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
2445 bool ret = false;
2446
2447 /*
2448 * Reseting generates a block interrupt, hence setting
2449 * the scatter-gather pointer to NULL.
2450 */
2451 if (host->sg) {
2452 sg_miter_stop(&host->sg_miter);
2453 host->sg = NULL;
2454 }
2455
2456 if (host->use_dma)
2457 flags |= SDMMC_CTRL_DMA_RESET;
2458
2459 if (dw_mci_ctrl_reset(host, flags)) {
2460 /*
2461 * In all cases we clear the RAWINTS register to clear any
2462 * interrupts.
2463 */
2464 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2465
2466 /* if using dma we wait for dma_req to clear */
2467 if (host->use_dma) {
2468 unsigned long timeout = jiffies + msecs_to_jiffies(500);
2469 u32 status;
2470 do {
2471 status = mci_readl(host, STATUS);
2472 if (!(status & SDMMC_STATUS_DMA_REQ))
2473 break;
2474 cpu_relax();
2475 } while (time_before(jiffies, timeout));
2476
2477 if (status & SDMMC_STATUS_DMA_REQ) {
2478 dev_err(host->dev,
2479 "%s: Timeout waiting for dma_req to "
2480 "clear during reset\n", __func__);
2481 goto ciu_out;
2482 }
2483
2484 /* when using DMA next we reset the fifo again */
2485 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
2486 goto ciu_out;
2487 }
2488 } else {
2489 /* if the controller reset bit did clear, then set clock regs */
2490 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
2491 dev_err(host->dev, "%s: fifo/dma reset bits didn't "
2492 "clear but ciu was reset, doing clock update\n",
2493 __func__);
2494 goto ciu_out;
2495 }
2496 }
2497
2498 #if IS_ENABLED(CONFIG_MMC_DW_IDMAC)
2499 /* It is also recommended that we reset and reprogram idmac */
2500 dw_mci_idmac_reset(host);
2501 #endif
2502
2503 ret = true;
2504
2505 ciu_out:
2506 /* After a CTRL reset we need to have CIU set clock registers */
2507 mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
2508
2509 return ret;
2510 }
2511
2512 #ifdef CONFIG_OF
2513 static struct dw_mci_of_quirks {
2514 char *quirk;
2515 int id;
2516 } of_quirks[] = {
2517 {
2518 .quirk = "broken-cd",
2519 .id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
2520 }, {
2521 .quirk = "disable-wp",
2522 .id = DW_MCI_QUIRK_NO_WRITE_PROTECT,
2523 },
2524 };
2525
2526 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2527 {
2528 struct dw_mci_board *pdata;
2529 struct device *dev = host->dev;
2530 struct device_node *np = dev->of_node;
2531 const struct dw_mci_drv_data *drv_data = host->drv_data;
2532 int idx, ret;
2533 u32 clock_frequency;
2534
2535 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2536 if (!pdata) {
2537 dev_err(dev, "could not allocate memory for pdata\n");
2538 return ERR_PTR(-ENOMEM);
2539 }
2540
2541 /* find out number of slots supported */
2542 if (of_property_read_u32(dev->of_node, "num-slots",
2543 &pdata->num_slots)) {
2544 dev_info(dev, "num-slots property not found, "
2545 "assuming 1 slot is available\n");
2546 pdata->num_slots = 1;
2547 }
2548
2549 /* get quirks */
2550 for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
2551 if (of_get_property(np, of_quirks[idx].quirk, NULL))
2552 pdata->quirks |= of_quirks[idx].id;
2553
2554 if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2555 dev_info(dev, "fifo-depth property not found, using "
2556 "value of FIFOTH register as default\n");
2557
2558 of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2559
2560 if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2561 pdata->bus_hz = clock_frequency;
2562
2563 if (drv_data && drv_data->parse_dt) {
2564 ret = drv_data->parse_dt(host);
2565 if (ret)
2566 return ERR_PTR(ret);
2567 }
2568
2569 if (of_find_property(np, "supports-highspeed", NULL))
2570 pdata->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2571
2572 return pdata;
2573 }
2574
2575 #else /* CONFIG_OF */
2576 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2577 {
2578 return ERR_PTR(-EINVAL);
2579 }
2580 #endif /* CONFIG_OF */
2581
2582 int dw_mci_probe(struct dw_mci *host)
2583 {
2584 const struct dw_mci_drv_data *drv_data = host->drv_data;
2585 int width, i, ret = 0;
2586 u32 fifo_size;
2587 int init_slots = 0;
2588
2589 if (!host->pdata) {
2590 host->pdata = dw_mci_parse_dt(host);
2591 if (IS_ERR(host->pdata)) {
2592 dev_err(host->dev, "platform data not available\n");
2593 return -EINVAL;
2594 }
2595 }
2596
2597 if (host->pdata->num_slots > 1) {
2598 dev_err(host->dev,
2599 "Platform data must supply num_slots.\n");
2600 return -ENODEV;
2601 }
2602
2603 host->biu_clk = devm_clk_get(host->dev, "biu");
2604 if (IS_ERR(host->biu_clk)) {
2605 dev_dbg(host->dev, "biu clock not available\n");
2606 } else {
2607 ret = clk_prepare_enable(host->biu_clk);
2608 if (ret) {
2609 dev_err(host->dev, "failed to enable biu clock\n");
2610 return ret;
2611 }
2612 }
2613
2614 host->ciu_clk = devm_clk_get(host->dev, "ciu");
2615 if (IS_ERR(host->ciu_clk)) {
2616 dev_dbg(host->dev, "ciu clock not available\n");
2617 host->bus_hz = host->pdata->bus_hz;
2618 } else {
2619 ret = clk_prepare_enable(host->ciu_clk);
2620 if (ret) {
2621 dev_err(host->dev, "failed to enable ciu clock\n");
2622 goto err_clk_biu;
2623 }
2624
2625 if (host->pdata->bus_hz) {
2626 ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
2627 if (ret)
2628 dev_warn(host->dev,
2629 "Unable to set bus rate to %uHz\n",
2630 host->pdata->bus_hz);
2631 }
2632 host->bus_hz = clk_get_rate(host->ciu_clk);
2633 }
2634
2635 if (!host->bus_hz) {
2636 dev_err(host->dev,
2637 "Platform data must supply bus speed\n");
2638 ret = -ENODEV;
2639 goto err_clk_ciu;
2640 }
2641
2642 if (drv_data && drv_data->init) {
2643 ret = drv_data->init(host);
2644 if (ret) {
2645 dev_err(host->dev,
2646 "implementation specific init failed\n");
2647 goto err_clk_ciu;
2648 }
2649 }
2650
2651 if (drv_data && drv_data->setup_clock) {
2652 ret = drv_data->setup_clock(host);
2653 if (ret) {
2654 dev_err(host->dev,
2655 "implementation specific clock setup failed\n");
2656 goto err_clk_ciu;
2657 }
2658 }
2659
2660 host->quirks = host->pdata->quirks;
2661
2662 spin_lock_init(&host->lock);
2663 INIT_LIST_HEAD(&host->queue);
2664
2665 /*
2666 * Get the host data width - this assumes that HCON has been set with
2667 * the correct values.
2668 */
2669 i = (mci_readl(host, HCON) >> 7) & 0x7;
2670 if (!i) {
2671 host->push_data = dw_mci_push_data16;
2672 host->pull_data = dw_mci_pull_data16;
2673 width = 16;
2674 host->data_shift = 1;
2675 } else if (i == 2) {
2676 host->push_data = dw_mci_push_data64;
2677 host->pull_data = dw_mci_pull_data64;
2678 width = 64;
2679 host->data_shift = 3;
2680 } else {
2681 /* Check for a reserved value, and warn if it is */
2682 WARN((i != 1),
2683 "HCON reports a reserved host data width!\n"
2684 "Defaulting to 32-bit access.\n");
2685 host->push_data = dw_mci_push_data32;
2686 host->pull_data = dw_mci_pull_data32;
2687 width = 32;
2688 host->data_shift = 2;
2689 }
2690
2691 /* Reset all blocks */
2692 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS))
2693 return -ENODEV;
2694
2695 host->dma_ops = host->pdata->dma_ops;
2696 dw_mci_init_dma(host);
2697
2698 /* Clear the interrupts for the host controller */
2699 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2700 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2701
2702 /* Put in max timeout */
2703 mci_writel(host, TMOUT, 0xFFFFFFFF);
2704
2705 /*
2706 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
2707 * Tx Mark = fifo_size / 2 DMA Size = 8
2708 */
2709 if (!host->pdata->fifo_depth) {
2710 /*
2711 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2712 * have been overwritten by the bootloader, just like we're
2713 * about to do, so if you know the value for your hardware, you
2714 * should put it in the platform data.
2715 */
2716 fifo_size = mci_readl(host, FIFOTH);
2717 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2718 } else {
2719 fifo_size = host->pdata->fifo_depth;
2720 }
2721 host->fifo_depth = fifo_size;
2722 host->fifoth_val =
2723 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2);
2724 mci_writel(host, FIFOTH, host->fifoth_val);
2725
2726 /* disable clock to CIU */
2727 mci_writel(host, CLKENA, 0);
2728 mci_writel(host, CLKSRC, 0);
2729
2730 /*
2731 * In 2.40a spec, Data offset is changed.
2732 * Need to check the version-id and set data-offset for DATA register.
2733 */
2734 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2735 dev_info(host->dev, "Version ID is %04x\n", host->verid);
2736
2737 if (host->verid < DW_MMC_240A)
2738 host->data_offset = DATA_OFFSET;
2739 else
2740 host->data_offset = DATA_240A_OFFSET;
2741
2742 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2743 ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
2744 host->irq_flags, "dw-mci", host);
2745 if (ret)
2746 goto err_dmaunmap;
2747
2748 if (host->pdata->num_slots)
2749 host->num_slots = host->pdata->num_slots;
2750 else
2751 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2752
2753 /*
2754 * Enable interrupts for command done, data over, data empty, card det,
2755 * receive ready and error such as transmit, receive timeout, crc error
2756 */
2757 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2758 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2759 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2760 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2761 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2762
2763 dev_info(host->dev, "DW MMC controller at irq %d, "
2764 "%d bit host data width, "
2765 "%u deep fifo\n",
2766 host->irq, width, fifo_size);
2767
2768 /* We need at least one slot to succeed */
2769 for (i = 0; i < host->num_slots; i++) {
2770 ret = dw_mci_init_slot(host, i);
2771 if (ret)
2772 dev_dbg(host->dev, "slot %d init failed\n", i);
2773 else
2774 init_slots++;
2775 }
2776
2777 if (init_slots) {
2778 dev_info(host->dev, "%d slots initialized\n", init_slots);
2779 } else {
2780 dev_dbg(host->dev, "attempted to initialize %d slots, "
2781 "but failed on all\n", host->num_slots);
2782 goto err_dmaunmap;
2783 }
2784
2785 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2786 dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
2787
2788 return 0;
2789
2790 err_dmaunmap:
2791 if (host->use_dma && host->dma_ops->exit)
2792 host->dma_ops->exit(host);
2793
2794 err_clk_ciu:
2795 if (!IS_ERR(host->ciu_clk))
2796 clk_disable_unprepare(host->ciu_clk);
2797
2798 err_clk_biu:
2799 if (!IS_ERR(host->biu_clk))
2800 clk_disable_unprepare(host->biu_clk);
2801
2802 return ret;
2803 }
2804 EXPORT_SYMBOL(dw_mci_probe);
2805
2806 void dw_mci_remove(struct dw_mci *host)
2807 {
2808 int i;
2809
2810 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2811 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2812
2813 for (i = 0; i < host->num_slots; i++) {
2814 dev_dbg(host->dev, "remove slot %d\n", i);
2815 if (host->slot[i])
2816 dw_mci_cleanup_slot(host->slot[i], i);
2817 }
2818
2819 /* disable clock to CIU */
2820 mci_writel(host, CLKENA, 0);
2821 mci_writel(host, CLKSRC, 0);
2822
2823 if (host->use_dma && host->dma_ops->exit)
2824 host->dma_ops->exit(host);
2825
2826 if (!IS_ERR(host->ciu_clk))
2827 clk_disable_unprepare(host->ciu_clk);
2828
2829 if (!IS_ERR(host->biu_clk))
2830 clk_disable_unprepare(host->biu_clk);
2831 }
2832 EXPORT_SYMBOL(dw_mci_remove);
2833
2834
2835
2836 #ifdef CONFIG_PM_SLEEP
2837 /*
2838 * TODO: we should probably disable the clock to the card in the suspend path.
2839 */
2840 int dw_mci_suspend(struct dw_mci *host)
2841 {
2842 return 0;
2843 }
2844 EXPORT_SYMBOL(dw_mci_suspend);
2845
2846 int dw_mci_resume(struct dw_mci *host)
2847 {
2848 int i, ret;
2849
2850 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
2851 ret = -ENODEV;
2852 return ret;
2853 }
2854
2855 if (host->use_dma && host->dma_ops->init)
2856 host->dma_ops->init(host);
2857
2858 /*
2859 * Restore the initial value at FIFOTH register
2860 * And Invalidate the prev_blksz with zero
2861 */
2862 mci_writel(host, FIFOTH, host->fifoth_val);
2863 host->prev_blksz = 0;
2864
2865 /* Put in max timeout */
2866 mci_writel(host, TMOUT, 0xFFFFFFFF);
2867
2868 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2869 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2870 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2871 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2872 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2873
2874 for (i = 0; i < host->num_slots; i++) {
2875 struct dw_mci_slot *slot = host->slot[i];
2876 if (!slot)
2877 continue;
2878 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
2879 dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
2880 dw_mci_setup_bus(slot, true);
2881 }
2882 }
2883 return 0;
2884 }
2885 EXPORT_SYMBOL(dw_mci_resume);
2886 #endif /* CONFIG_PM_SLEEP */
2887
2888 static int __init dw_mci_init(void)
2889 {
2890 pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
2891 return 0;
2892 }
2893
2894 static void __exit dw_mci_exit(void)
2895 {
2896 }
2897
2898 module_init(dw_mci_init);
2899 module_exit(dw_mci_exit);
2900
2901 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2902 MODULE_AUTHOR("NXP Semiconductor VietNam");
2903 MODULE_AUTHOR("Imagination Technologies Ltd");
2904 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support