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Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[deliverable/linux.git] / drivers / mmc / host / dw_mmc.c
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/dw_mmc.h>
33 #include <linux/bitops.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/workqueue.h>
36 #include <linux/of.h>
37 #include <linux/of_gpio.h>
38
39 #include "dw_mmc.h"
40
41 /* Common flag combinations */
42 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \
43 SDMMC_INT_HTO | SDMMC_INT_SBE | \
44 SDMMC_INT_EBE)
45 #define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
46 SDMMC_INT_RESP_ERR)
47 #define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
48 DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
49 #define DW_MCI_SEND_STATUS 1
50 #define DW_MCI_RECV_STATUS 2
51 #define DW_MCI_DMA_THRESHOLD 16
52
53 #ifdef CONFIG_MMC_DW_IDMAC
54 #define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
55 SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
56 SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
57 SDMMC_IDMAC_INT_TI)
58
59 struct idmac_desc {
60 u32 des0; /* Control Descriptor */
61 #define IDMAC_DES0_DIC BIT(1)
62 #define IDMAC_DES0_LD BIT(2)
63 #define IDMAC_DES0_FD BIT(3)
64 #define IDMAC_DES0_CH BIT(4)
65 #define IDMAC_DES0_ER BIT(5)
66 #define IDMAC_DES0_CES BIT(30)
67 #define IDMAC_DES0_OWN BIT(31)
68
69 u32 des1; /* Buffer sizes */
70 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
71 ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
72
73 u32 des2; /* buffer 1 physical address */
74
75 u32 des3; /* buffer 2 physical address */
76 };
77 #endif /* CONFIG_MMC_DW_IDMAC */
78
79 /**
80 * struct dw_mci_slot - MMC slot state
81 * @mmc: The mmc_host representing this slot.
82 * @host: The MMC controller this slot is using.
83 * @quirks: Slot-level quirks (DW_MCI_SLOT_QUIRK_XXX)
84 * @wp_gpio: If gpio_is_valid() we'll use this to read write protect.
85 * @ctype: Card type for this slot.
86 * @mrq: mmc_request currently being processed or waiting to be
87 * processed, or NULL when the slot is idle.
88 * @queue_node: List node for placing this node in the @queue list of
89 * &struct dw_mci.
90 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
91 * @flags: Random state bits associated with the slot.
92 * @id: Number of this slot.
93 * @last_detect_state: Most recently observed card detect state.
94 */
95 struct dw_mci_slot {
96 struct mmc_host *mmc;
97 struct dw_mci *host;
98
99 int quirks;
100 int wp_gpio;
101
102 u32 ctype;
103
104 struct mmc_request *mrq;
105 struct list_head queue_node;
106
107 unsigned int clock;
108 unsigned long flags;
109 #define DW_MMC_CARD_PRESENT 0
110 #define DW_MMC_CARD_NEED_INIT 1
111 int id;
112 int last_detect_state;
113 };
114
115 #if defined(CONFIG_DEBUG_FS)
116 static int dw_mci_req_show(struct seq_file *s, void *v)
117 {
118 struct dw_mci_slot *slot = s->private;
119 struct mmc_request *mrq;
120 struct mmc_command *cmd;
121 struct mmc_command *stop;
122 struct mmc_data *data;
123
124 /* Make sure we get a consistent snapshot */
125 spin_lock_bh(&slot->host->lock);
126 mrq = slot->mrq;
127
128 if (mrq) {
129 cmd = mrq->cmd;
130 data = mrq->data;
131 stop = mrq->stop;
132
133 if (cmd)
134 seq_printf(s,
135 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
136 cmd->opcode, cmd->arg, cmd->flags,
137 cmd->resp[0], cmd->resp[1], cmd->resp[2],
138 cmd->resp[2], cmd->error);
139 if (data)
140 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
141 data->bytes_xfered, data->blocks,
142 data->blksz, data->flags, data->error);
143 if (stop)
144 seq_printf(s,
145 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
146 stop->opcode, stop->arg, stop->flags,
147 stop->resp[0], stop->resp[1], stop->resp[2],
148 stop->resp[2], stop->error);
149 }
150
151 spin_unlock_bh(&slot->host->lock);
152
153 return 0;
154 }
155
156 static int dw_mci_req_open(struct inode *inode, struct file *file)
157 {
158 return single_open(file, dw_mci_req_show, inode->i_private);
159 }
160
161 static const struct file_operations dw_mci_req_fops = {
162 .owner = THIS_MODULE,
163 .open = dw_mci_req_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = single_release,
167 };
168
169 static int dw_mci_regs_show(struct seq_file *s, void *v)
170 {
171 seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
172 seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
173 seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
174 seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
175 seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
176 seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
177
178 return 0;
179 }
180
181 static int dw_mci_regs_open(struct inode *inode, struct file *file)
182 {
183 return single_open(file, dw_mci_regs_show, inode->i_private);
184 }
185
186 static const struct file_operations dw_mci_regs_fops = {
187 .owner = THIS_MODULE,
188 .open = dw_mci_regs_open,
189 .read = seq_read,
190 .llseek = seq_lseek,
191 .release = single_release,
192 };
193
194 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
195 {
196 struct mmc_host *mmc = slot->mmc;
197 struct dw_mci *host = slot->host;
198 struct dentry *root;
199 struct dentry *node;
200
201 root = mmc->debugfs_root;
202 if (!root)
203 return;
204
205 node = debugfs_create_file("regs", S_IRUSR, root, host,
206 &dw_mci_regs_fops);
207 if (!node)
208 goto err;
209
210 node = debugfs_create_file("req", S_IRUSR, root, slot,
211 &dw_mci_req_fops);
212 if (!node)
213 goto err;
214
215 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
216 if (!node)
217 goto err;
218
219 node = debugfs_create_x32("pending_events", S_IRUSR, root,
220 (u32 *)&host->pending_events);
221 if (!node)
222 goto err;
223
224 node = debugfs_create_x32("completed_events", S_IRUSR, root,
225 (u32 *)&host->completed_events);
226 if (!node)
227 goto err;
228
229 return;
230
231 err:
232 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
233 }
234 #endif /* defined(CONFIG_DEBUG_FS) */
235
236 static void dw_mci_set_timeout(struct dw_mci *host)
237 {
238 /* timeout (maximum) */
239 mci_writel(host, TMOUT, 0xffffffff);
240 }
241
242 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
243 {
244 struct mmc_data *data;
245 struct dw_mci_slot *slot = mmc_priv(mmc);
246 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
247 u32 cmdr;
248 cmd->error = -EINPROGRESS;
249
250 cmdr = cmd->opcode;
251
252 if (cmdr == MMC_STOP_TRANSMISSION)
253 cmdr |= SDMMC_CMD_STOP;
254 else
255 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
256
257 if (cmd->flags & MMC_RSP_PRESENT) {
258 /* We expect a response, so set this bit */
259 cmdr |= SDMMC_CMD_RESP_EXP;
260 if (cmd->flags & MMC_RSP_136)
261 cmdr |= SDMMC_CMD_RESP_LONG;
262 }
263
264 if (cmd->flags & MMC_RSP_CRC)
265 cmdr |= SDMMC_CMD_RESP_CRC;
266
267 data = cmd->data;
268 if (data) {
269 cmdr |= SDMMC_CMD_DAT_EXP;
270 if (data->flags & MMC_DATA_STREAM)
271 cmdr |= SDMMC_CMD_STRM_MODE;
272 if (data->flags & MMC_DATA_WRITE)
273 cmdr |= SDMMC_CMD_DAT_WR;
274 }
275
276 if (drv_data && drv_data->prepare_command)
277 drv_data->prepare_command(slot->host, &cmdr);
278
279 return cmdr;
280 }
281
282 static void dw_mci_start_command(struct dw_mci *host,
283 struct mmc_command *cmd, u32 cmd_flags)
284 {
285 host->cmd = cmd;
286 dev_vdbg(host->dev,
287 "start command: ARGR=0x%08x CMDR=0x%08x\n",
288 cmd->arg, cmd_flags);
289
290 mci_writel(host, CMDARG, cmd->arg);
291 wmb();
292
293 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
294 }
295
296 static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
297 {
298 dw_mci_start_command(host, data->stop, host->stop_cmdr);
299 }
300
301 /* DMA interface functions */
302 static void dw_mci_stop_dma(struct dw_mci *host)
303 {
304 if (host->using_dma) {
305 host->dma_ops->stop(host);
306 host->dma_ops->cleanup(host);
307 } else {
308 /* Data transfer was stopped by the interrupt handler */
309 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
310 }
311 }
312
313 static int dw_mci_get_dma_dir(struct mmc_data *data)
314 {
315 if (data->flags & MMC_DATA_WRITE)
316 return DMA_TO_DEVICE;
317 else
318 return DMA_FROM_DEVICE;
319 }
320
321 #ifdef CONFIG_MMC_DW_IDMAC
322 static void dw_mci_dma_cleanup(struct dw_mci *host)
323 {
324 struct mmc_data *data = host->data;
325
326 if (data)
327 if (!data->host_cookie)
328 dma_unmap_sg(host->dev,
329 data->sg,
330 data->sg_len,
331 dw_mci_get_dma_dir(data));
332 }
333
334 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
335 {
336 u32 temp;
337
338 /* Disable and reset the IDMAC interface */
339 temp = mci_readl(host, CTRL);
340 temp &= ~SDMMC_CTRL_USE_IDMAC;
341 temp |= SDMMC_CTRL_DMA_RESET;
342 mci_writel(host, CTRL, temp);
343
344 /* Stop the IDMAC running */
345 temp = mci_readl(host, BMOD);
346 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
347 mci_writel(host, BMOD, temp);
348 }
349
350 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
351 {
352 struct mmc_data *data = host->data;
353
354 dev_vdbg(host->dev, "DMA complete\n");
355
356 host->dma_ops->cleanup(host);
357
358 /*
359 * If the card was removed, data will be NULL. No point in trying to
360 * send the stop command or waiting for NBUSY in this case.
361 */
362 if (data) {
363 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
364 tasklet_schedule(&host->tasklet);
365 }
366 }
367
368 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
369 unsigned int sg_len)
370 {
371 int i;
372 struct idmac_desc *desc = host->sg_cpu;
373
374 for (i = 0; i < sg_len; i++, desc++) {
375 unsigned int length = sg_dma_len(&data->sg[i]);
376 u32 mem_addr = sg_dma_address(&data->sg[i]);
377
378 /* Set the OWN bit and disable interrupts for this descriptor */
379 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
380
381 /* Buffer length */
382 IDMAC_SET_BUFFER1_SIZE(desc, length);
383
384 /* Physical address to DMA to/from */
385 desc->des2 = mem_addr;
386 }
387
388 /* Set first descriptor */
389 desc = host->sg_cpu;
390 desc->des0 |= IDMAC_DES0_FD;
391
392 /* Set last descriptor */
393 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
394 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
395 desc->des0 |= IDMAC_DES0_LD;
396
397 wmb();
398 }
399
400 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
401 {
402 u32 temp;
403
404 dw_mci_translate_sglist(host, host->data, sg_len);
405
406 /* Select IDMAC interface */
407 temp = mci_readl(host, CTRL);
408 temp |= SDMMC_CTRL_USE_IDMAC;
409 mci_writel(host, CTRL, temp);
410
411 wmb();
412
413 /* Enable the IDMAC */
414 temp = mci_readl(host, BMOD);
415 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
416 mci_writel(host, BMOD, temp);
417
418 /* Start it running */
419 mci_writel(host, PLDMND, 1);
420 }
421
422 static int dw_mci_idmac_init(struct dw_mci *host)
423 {
424 struct idmac_desc *p;
425 int i;
426
427 /* Number of descriptors in the ring buffer */
428 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
429
430 /* Forward link the descriptor list */
431 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
432 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
433
434 /* Set the last descriptor as the end-of-ring descriptor */
435 p->des3 = host->sg_dma;
436 p->des0 = IDMAC_DES0_ER;
437
438 mci_writel(host, BMOD, SDMMC_IDMAC_SWRESET);
439
440 /* Mask out interrupts - get Tx & Rx complete only */
441 mci_writel(host, IDSTS, IDMAC_INT_CLR);
442 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
443 SDMMC_IDMAC_INT_TI);
444
445 /* Set the descriptor base address */
446 mci_writel(host, DBADDR, host->sg_dma);
447 return 0;
448 }
449
450 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
451 .init = dw_mci_idmac_init,
452 .start = dw_mci_idmac_start_dma,
453 .stop = dw_mci_idmac_stop_dma,
454 .complete = dw_mci_idmac_complete_dma,
455 .cleanup = dw_mci_dma_cleanup,
456 };
457 #endif /* CONFIG_MMC_DW_IDMAC */
458
459 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
460 struct mmc_data *data,
461 bool next)
462 {
463 struct scatterlist *sg;
464 unsigned int i, sg_len;
465
466 if (!next && data->host_cookie)
467 return data->host_cookie;
468
469 /*
470 * We don't do DMA on "complex" transfers, i.e. with
471 * non-word-aligned buffers or lengths. Also, we don't bother
472 * with all the DMA setup overhead for short transfers.
473 */
474 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
475 return -EINVAL;
476
477 if (data->blksz & 3)
478 return -EINVAL;
479
480 for_each_sg(data->sg, sg, data->sg_len, i) {
481 if (sg->offset & 3 || sg->length & 3)
482 return -EINVAL;
483 }
484
485 sg_len = dma_map_sg(host->dev,
486 data->sg,
487 data->sg_len,
488 dw_mci_get_dma_dir(data));
489 if (sg_len == 0)
490 return -EINVAL;
491
492 if (next)
493 data->host_cookie = sg_len;
494
495 return sg_len;
496 }
497
498 static void dw_mci_pre_req(struct mmc_host *mmc,
499 struct mmc_request *mrq,
500 bool is_first_req)
501 {
502 struct dw_mci_slot *slot = mmc_priv(mmc);
503 struct mmc_data *data = mrq->data;
504
505 if (!slot->host->use_dma || !data)
506 return;
507
508 if (data->host_cookie) {
509 data->host_cookie = 0;
510 return;
511 }
512
513 if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
514 data->host_cookie = 0;
515 }
516
517 static void dw_mci_post_req(struct mmc_host *mmc,
518 struct mmc_request *mrq,
519 int err)
520 {
521 struct dw_mci_slot *slot = mmc_priv(mmc);
522 struct mmc_data *data = mrq->data;
523
524 if (!slot->host->use_dma || !data)
525 return;
526
527 if (data->host_cookie)
528 dma_unmap_sg(slot->host->dev,
529 data->sg,
530 data->sg_len,
531 dw_mci_get_dma_dir(data));
532 data->host_cookie = 0;
533 }
534
535 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
536 {
537 int sg_len;
538 u32 temp;
539
540 host->using_dma = 0;
541
542 /* If we don't have a channel, we can't do DMA */
543 if (!host->use_dma)
544 return -ENODEV;
545
546 sg_len = dw_mci_pre_dma_transfer(host, data, 0);
547 if (sg_len < 0) {
548 host->dma_ops->stop(host);
549 return sg_len;
550 }
551
552 host->using_dma = 1;
553
554 dev_vdbg(host->dev,
555 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
556 (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
557 sg_len);
558
559 /* Enable the DMA interface */
560 temp = mci_readl(host, CTRL);
561 temp |= SDMMC_CTRL_DMA_ENABLE;
562 mci_writel(host, CTRL, temp);
563
564 /* Disable RX/TX IRQs, let DMA handle it */
565 temp = mci_readl(host, INTMASK);
566 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
567 mci_writel(host, INTMASK, temp);
568
569 host->dma_ops->start(host, sg_len);
570
571 return 0;
572 }
573
574 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
575 {
576 u32 temp;
577
578 data->error = -EINPROGRESS;
579
580 WARN_ON(host->data);
581 host->sg = NULL;
582 host->data = data;
583
584 if (data->flags & MMC_DATA_READ)
585 host->dir_status = DW_MCI_RECV_STATUS;
586 else
587 host->dir_status = DW_MCI_SEND_STATUS;
588
589 if (dw_mci_submit_data_dma(host, data)) {
590 int flags = SG_MITER_ATOMIC;
591 if (host->data->flags & MMC_DATA_READ)
592 flags |= SG_MITER_TO_SG;
593 else
594 flags |= SG_MITER_FROM_SG;
595
596 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
597 host->sg = data->sg;
598 host->part_buf_start = 0;
599 host->part_buf_count = 0;
600
601 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
602 temp = mci_readl(host, INTMASK);
603 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
604 mci_writel(host, INTMASK, temp);
605
606 temp = mci_readl(host, CTRL);
607 temp &= ~SDMMC_CTRL_DMA_ENABLE;
608 mci_writel(host, CTRL, temp);
609 }
610 }
611
612 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
613 {
614 struct dw_mci *host = slot->host;
615 unsigned long timeout = jiffies + msecs_to_jiffies(500);
616 unsigned int cmd_status = 0;
617
618 mci_writel(host, CMDARG, arg);
619 wmb();
620 mci_writel(host, CMD, SDMMC_CMD_START | cmd);
621
622 while (time_before(jiffies, timeout)) {
623 cmd_status = mci_readl(host, CMD);
624 if (!(cmd_status & SDMMC_CMD_START))
625 return;
626 }
627 dev_err(&slot->mmc->class_dev,
628 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
629 cmd, arg, cmd_status);
630 }
631
632 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
633 {
634 struct dw_mci *host = slot->host;
635 u32 div;
636 u32 clk_en_a;
637
638 if (slot->clock != host->current_speed || force_clkinit) {
639 div = host->bus_hz / slot->clock;
640 if (host->bus_hz % slot->clock && host->bus_hz > slot->clock)
641 /*
642 * move the + 1 after the divide to prevent
643 * over-clocking the card.
644 */
645 div += 1;
646
647 div = (host->bus_hz != slot->clock) ? DIV_ROUND_UP(div, 2) : 0;
648
649 dev_info(&slot->mmc->class_dev,
650 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
651 " div = %d)\n", slot->id, host->bus_hz, slot->clock,
652 div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
653
654 /* disable clock */
655 mci_writel(host, CLKENA, 0);
656 mci_writel(host, CLKSRC, 0);
657
658 /* inform CIU */
659 mci_send_cmd(slot,
660 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
661
662 /* set clock to desired speed */
663 mci_writel(host, CLKDIV, div);
664
665 /* inform CIU */
666 mci_send_cmd(slot,
667 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
668
669 /* enable clock; only low power if no SDIO */
670 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
671 if (!(mci_readl(host, INTMASK) & SDMMC_INT_SDIO(slot->id)))
672 clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
673 mci_writel(host, CLKENA, clk_en_a);
674
675 /* inform CIU */
676 mci_send_cmd(slot,
677 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
678
679 host->current_speed = slot->clock;
680 }
681
682 /* Set the current slot bus width */
683 mci_writel(host, CTYPE, (slot->ctype << slot->id));
684 }
685
686 static void __dw_mci_start_request(struct dw_mci *host,
687 struct dw_mci_slot *slot,
688 struct mmc_command *cmd)
689 {
690 struct mmc_request *mrq;
691 struct mmc_data *data;
692 u32 cmdflags;
693
694 mrq = slot->mrq;
695 if (host->pdata->select_slot)
696 host->pdata->select_slot(slot->id);
697
698 host->cur_slot = slot;
699 host->mrq = mrq;
700
701 host->pending_events = 0;
702 host->completed_events = 0;
703 host->data_status = 0;
704
705 data = cmd->data;
706 if (data) {
707 dw_mci_set_timeout(host);
708 mci_writel(host, BYTCNT, data->blksz*data->blocks);
709 mci_writel(host, BLKSIZ, data->blksz);
710 }
711
712 cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
713
714 /* this is the first command, send the initialization clock */
715 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
716 cmdflags |= SDMMC_CMD_INIT;
717
718 if (data) {
719 dw_mci_submit_data(host, data);
720 wmb();
721 }
722
723 dw_mci_start_command(host, cmd, cmdflags);
724
725 if (mrq->stop)
726 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
727 }
728
729 static void dw_mci_start_request(struct dw_mci *host,
730 struct dw_mci_slot *slot)
731 {
732 struct mmc_request *mrq = slot->mrq;
733 struct mmc_command *cmd;
734
735 cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
736 __dw_mci_start_request(host, slot, cmd);
737 }
738
739 /* must be called with host->lock held */
740 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
741 struct mmc_request *mrq)
742 {
743 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
744 host->state);
745
746 slot->mrq = mrq;
747
748 if (host->state == STATE_IDLE) {
749 host->state = STATE_SENDING_CMD;
750 dw_mci_start_request(host, slot);
751 } else {
752 list_add_tail(&slot->queue_node, &host->queue);
753 }
754 }
755
756 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
757 {
758 struct dw_mci_slot *slot = mmc_priv(mmc);
759 struct dw_mci *host = slot->host;
760
761 WARN_ON(slot->mrq);
762
763 /*
764 * The check for card presence and queueing of the request must be
765 * atomic, otherwise the card could be removed in between and the
766 * request wouldn't fail until another card was inserted.
767 */
768 spin_lock_bh(&host->lock);
769
770 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
771 spin_unlock_bh(&host->lock);
772 mrq->cmd->error = -ENOMEDIUM;
773 mmc_request_done(mmc, mrq);
774 return;
775 }
776
777 dw_mci_queue_request(host, slot, mrq);
778
779 spin_unlock_bh(&host->lock);
780 }
781
782 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
783 {
784 struct dw_mci_slot *slot = mmc_priv(mmc);
785 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
786 u32 regs;
787
788 switch (ios->bus_width) {
789 case MMC_BUS_WIDTH_4:
790 slot->ctype = SDMMC_CTYPE_4BIT;
791 break;
792 case MMC_BUS_WIDTH_8:
793 slot->ctype = SDMMC_CTYPE_8BIT;
794 break;
795 default:
796 /* set default 1 bit mode */
797 slot->ctype = SDMMC_CTYPE_1BIT;
798 }
799
800 regs = mci_readl(slot->host, UHS_REG);
801
802 /* DDR mode set */
803 if (ios->timing == MMC_TIMING_UHS_DDR50)
804 regs |= ((0x1 << slot->id) << 16);
805 else
806 regs &= ~((0x1 << slot->id) << 16);
807
808 mci_writel(slot->host, UHS_REG, regs);
809
810 if (ios->clock) {
811 /*
812 * Use mirror of ios->clock to prevent race with mmc
813 * core ios update when finding the minimum.
814 */
815 slot->clock = ios->clock;
816 }
817
818 if (drv_data && drv_data->set_ios)
819 drv_data->set_ios(slot->host, ios);
820
821 /* Slot specific timing and width adjustment */
822 dw_mci_setup_bus(slot, false);
823
824 switch (ios->power_mode) {
825 case MMC_POWER_UP:
826 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
827 /* Power up slot */
828 if (slot->host->pdata->setpower)
829 slot->host->pdata->setpower(slot->id, mmc->ocr_avail);
830 regs = mci_readl(slot->host, PWREN);
831 regs |= (1 << slot->id);
832 mci_writel(slot->host, PWREN, regs);
833 break;
834 case MMC_POWER_OFF:
835 /* Power down slot */
836 if (slot->host->pdata->setpower)
837 slot->host->pdata->setpower(slot->id, 0);
838 regs = mci_readl(slot->host, PWREN);
839 regs &= ~(1 << slot->id);
840 mci_writel(slot->host, PWREN, regs);
841 break;
842 default:
843 break;
844 }
845 }
846
847 static int dw_mci_get_ro(struct mmc_host *mmc)
848 {
849 int read_only;
850 struct dw_mci_slot *slot = mmc_priv(mmc);
851 struct dw_mci_board *brd = slot->host->pdata;
852
853 /* Use platform get_ro function, else try on board write protect */
854 if (slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT)
855 read_only = 0;
856 else if (brd->get_ro)
857 read_only = brd->get_ro(slot->id);
858 else if (gpio_is_valid(slot->wp_gpio))
859 read_only = gpio_get_value(slot->wp_gpio);
860 else
861 read_only =
862 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
863
864 dev_dbg(&mmc->class_dev, "card is %s\n",
865 read_only ? "read-only" : "read-write");
866
867 return read_only;
868 }
869
870 static int dw_mci_get_cd(struct mmc_host *mmc)
871 {
872 int present;
873 struct dw_mci_slot *slot = mmc_priv(mmc);
874 struct dw_mci_board *brd = slot->host->pdata;
875
876 /* Use platform get_cd function, else try onboard card detect */
877 if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
878 present = 1;
879 else if (brd->get_cd)
880 present = !brd->get_cd(slot->id);
881 else
882 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
883 == 0 ? 1 : 0;
884
885 if (present)
886 dev_dbg(&mmc->class_dev, "card is present\n");
887 else
888 dev_dbg(&mmc->class_dev, "card is not present\n");
889
890 return present;
891 }
892
893 /*
894 * Disable lower power mode.
895 *
896 * Low power mode will stop the card clock when idle. According to the
897 * description of the CLKENA register we should disable low power mode
898 * for SDIO cards if we need SDIO interrupts to work.
899 *
900 * This function is fast if low power mode is already disabled.
901 */
902 static void dw_mci_disable_low_power(struct dw_mci_slot *slot)
903 {
904 struct dw_mci *host = slot->host;
905 u32 clk_en_a;
906 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
907
908 clk_en_a = mci_readl(host, CLKENA);
909
910 if (clk_en_a & clken_low_pwr) {
911 mci_writel(host, CLKENA, clk_en_a & ~clken_low_pwr);
912 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
913 SDMMC_CMD_PRV_DAT_WAIT, 0);
914 }
915 }
916
917 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
918 {
919 struct dw_mci_slot *slot = mmc_priv(mmc);
920 struct dw_mci *host = slot->host;
921 u32 int_mask;
922
923 /* Enable/disable Slot Specific SDIO interrupt */
924 int_mask = mci_readl(host, INTMASK);
925 if (enb) {
926 /*
927 * Turn off low power mode if it was enabled. This is a bit of
928 * a heavy operation and we disable / enable IRQs a lot, so
929 * we'll leave low power mode disabled and it will get
930 * re-enabled again in dw_mci_setup_bus().
931 */
932 dw_mci_disable_low_power(slot);
933
934 mci_writel(host, INTMASK,
935 (int_mask | SDMMC_INT_SDIO(slot->id)));
936 } else {
937 mci_writel(host, INTMASK,
938 (int_mask & ~SDMMC_INT_SDIO(slot->id)));
939 }
940 }
941
942 static const struct mmc_host_ops dw_mci_ops = {
943 .request = dw_mci_request,
944 .pre_req = dw_mci_pre_req,
945 .post_req = dw_mci_post_req,
946 .set_ios = dw_mci_set_ios,
947 .get_ro = dw_mci_get_ro,
948 .get_cd = dw_mci_get_cd,
949 .enable_sdio_irq = dw_mci_enable_sdio_irq,
950 };
951
952 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
953 __releases(&host->lock)
954 __acquires(&host->lock)
955 {
956 struct dw_mci_slot *slot;
957 struct mmc_host *prev_mmc = host->cur_slot->mmc;
958
959 WARN_ON(host->cmd || host->data);
960
961 host->cur_slot->mrq = NULL;
962 host->mrq = NULL;
963 if (!list_empty(&host->queue)) {
964 slot = list_entry(host->queue.next,
965 struct dw_mci_slot, queue_node);
966 list_del(&slot->queue_node);
967 dev_vdbg(host->dev, "list not empty: %s is next\n",
968 mmc_hostname(slot->mmc));
969 host->state = STATE_SENDING_CMD;
970 dw_mci_start_request(host, slot);
971 } else {
972 dev_vdbg(host->dev, "list empty\n");
973 host->state = STATE_IDLE;
974 }
975
976 spin_unlock(&host->lock);
977 mmc_request_done(prev_mmc, mrq);
978 spin_lock(&host->lock);
979 }
980
981 static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
982 {
983 u32 status = host->cmd_status;
984
985 host->cmd_status = 0;
986
987 /* Read the response from the card (up to 16 bytes) */
988 if (cmd->flags & MMC_RSP_PRESENT) {
989 if (cmd->flags & MMC_RSP_136) {
990 cmd->resp[3] = mci_readl(host, RESP0);
991 cmd->resp[2] = mci_readl(host, RESP1);
992 cmd->resp[1] = mci_readl(host, RESP2);
993 cmd->resp[0] = mci_readl(host, RESP3);
994 } else {
995 cmd->resp[0] = mci_readl(host, RESP0);
996 cmd->resp[1] = 0;
997 cmd->resp[2] = 0;
998 cmd->resp[3] = 0;
999 }
1000 }
1001
1002 if (status & SDMMC_INT_RTO)
1003 cmd->error = -ETIMEDOUT;
1004 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
1005 cmd->error = -EILSEQ;
1006 else if (status & SDMMC_INT_RESP_ERR)
1007 cmd->error = -EIO;
1008 else
1009 cmd->error = 0;
1010
1011 if (cmd->error) {
1012 /* newer ip versions need a delay between retries */
1013 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
1014 mdelay(20);
1015
1016 if (cmd->data) {
1017 dw_mci_stop_dma(host);
1018 host->data = NULL;
1019 }
1020 }
1021 }
1022
1023 static void dw_mci_tasklet_func(unsigned long priv)
1024 {
1025 struct dw_mci *host = (struct dw_mci *)priv;
1026 struct mmc_data *data;
1027 struct mmc_command *cmd;
1028 enum dw_mci_state state;
1029 enum dw_mci_state prev_state;
1030 u32 status, ctrl;
1031
1032 spin_lock(&host->lock);
1033
1034 state = host->state;
1035 data = host->data;
1036
1037 do {
1038 prev_state = state;
1039
1040 switch (state) {
1041 case STATE_IDLE:
1042 break;
1043
1044 case STATE_SENDING_CMD:
1045 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1046 &host->pending_events))
1047 break;
1048
1049 cmd = host->cmd;
1050 host->cmd = NULL;
1051 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1052 dw_mci_command_complete(host, cmd);
1053 if (cmd == host->mrq->sbc && !cmd->error) {
1054 prev_state = state = STATE_SENDING_CMD;
1055 __dw_mci_start_request(host, host->cur_slot,
1056 host->mrq->cmd);
1057 goto unlock;
1058 }
1059
1060 if (!host->mrq->data || cmd->error) {
1061 dw_mci_request_end(host, host->mrq);
1062 goto unlock;
1063 }
1064
1065 prev_state = state = STATE_SENDING_DATA;
1066 /* fall through */
1067
1068 case STATE_SENDING_DATA:
1069 if (test_and_clear_bit(EVENT_DATA_ERROR,
1070 &host->pending_events)) {
1071 dw_mci_stop_dma(host);
1072 if (data->stop)
1073 send_stop_cmd(host, data);
1074 state = STATE_DATA_ERROR;
1075 break;
1076 }
1077
1078 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1079 &host->pending_events))
1080 break;
1081
1082 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1083 prev_state = state = STATE_DATA_BUSY;
1084 /* fall through */
1085
1086 case STATE_DATA_BUSY:
1087 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1088 &host->pending_events))
1089 break;
1090
1091 host->data = NULL;
1092 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1093 status = host->data_status;
1094
1095 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1096 if (status & SDMMC_INT_DRTO) {
1097 data->error = -ETIMEDOUT;
1098 } else if (status & SDMMC_INT_DCRC) {
1099 data->error = -EILSEQ;
1100 } else if (status & SDMMC_INT_EBE &&
1101 host->dir_status ==
1102 DW_MCI_SEND_STATUS) {
1103 /*
1104 * No data CRC status was returned.
1105 * The number of bytes transferred will
1106 * be exaggerated in PIO mode.
1107 */
1108 data->bytes_xfered = 0;
1109 data->error = -ETIMEDOUT;
1110 } else {
1111 dev_err(host->dev,
1112 "data FIFO error "
1113 "(status=%08x)\n",
1114 status);
1115 data->error = -EIO;
1116 }
1117 /*
1118 * After an error, there may be data lingering
1119 * in the FIFO, so reset it - doing so
1120 * generates a block interrupt, hence setting
1121 * the scatter-gather pointer to NULL.
1122 */
1123 sg_miter_stop(&host->sg_miter);
1124 host->sg = NULL;
1125 ctrl = mci_readl(host, CTRL);
1126 ctrl |= SDMMC_CTRL_FIFO_RESET;
1127 mci_writel(host, CTRL, ctrl);
1128 } else {
1129 data->bytes_xfered = data->blocks * data->blksz;
1130 data->error = 0;
1131 }
1132
1133 if (!data->stop) {
1134 dw_mci_request_end(host, host->mrq);
1135 goto unlock;
1136 }
1137
1138 if (host->mrq->sbc && !data->error) {
1139 data->stop->error = 0;
1140 dw_mci_request_end(host, host->mrq);
1141 goto unlock;
1142 }
1143
1144 prev_state = state = STATE_SENDING_STOP;
1145 if (!data->error)
1146 send_stop_cmd(host, data);
1147 /* fall through */
1148
1149 case STATE_SENDING_STOP:
1150 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1151 &host->pending_events))
1152 break;
1153
1154 host->cmd = NULL;
1155 dw_mci_command_complete(host, host->mrq->stop);
1156 dw_mci_request_end(host, host->mrq);
1157 goto unlock;
1158
1159 case STATE_DATA_ERROR:
1160 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1161 &host->pending_events))
1162 break;
1163
1164 state = STATE_DATA_BUSY;
1165 break;
1166 }
1167 } while (state != prev_state);
1168
1169 host->state = state;
1170 unlock:
1171 spin_unlock(&host->lock);
1172
1173 }
1174
1175 /* push final bytes to part_buf, only use during push */
1176 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1177 {
1178 memcpy((void *)&host->part_buf, buf, cnt);
1179 host->part_buf_count = cnt;
1180 }
1181
1182 /* append bytes to part_buf, only use during push */
1183 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1184 {
1185 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1186 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1187 host->part_buf_count += cnt;
1188 return cnt;
1189 }
1190
1191 /* pull first bytes from part_buf, only use during pull */
1192 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1193 {
1194 cnt = min(cnt, (int)host->part_buf_count);
1195 if (cnt) {
1196 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1197 cnt);
1198 host->part_buf_count -= cnt;
1199 host->part_buf_start += cnt;
1200 }
1201 return cnt;
1202 }
1203
1204 /* pull final bytes from the part_buf, assuming it's just been filled */
1205 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1206 {
1207 memcpy(buf, &host->part_buf, cnt);
1208 host->part_buf_start = cnt;
1209 host->part_buf_count = (1 << host->data_shift) - cnt;
1210 }
1211
1212 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1213 {
1214 struct mmc_data *data = host->data;
1215 int init_cnt = cnt;
1216
1217 /* try and push anything in the part_buf */
1218 if (unlikely(host->part_buf_count)) {
1219 int len = dw_mci_push_part_bytes(host, buf, cnt);
1220 buf += len;
1221 cnt -= len;
1222 if (host->part_buf_count == 2) {
1223 mci_writew(host, DATA(host->data_offset),
1224 host->part_buf16);
1225 host->part_buf_count = 0;
1226 }
1227 }
1228 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1229 if (unlikely((unsigned long)buf & 0x1)) {
1230 while (cnt >= 2) {
1231 u16 aligned_buf[64];
1232 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1233 int items = len >> 1;
1234 int i;
1235 /* memcpy from input buffer into aligned buffer */
1236 memcpy(aligned_buf, buf, len);
1237 buf += len;
1238 cnt -= len;
1239 /* push data from aligned buffer into fifo */
1240 for (i = 0; i < items; ++i)
1241 mci_writew(host, DATA(host->data_offset),
1242 aligned_buf[i]);
1243 }
1244 } else
1245 #endif
1246 {
1247 u16 *pdata = buf;
1248 for (; cnt >= 2; cnt -= 2)
1249 mci_writew(host, DATA(host->data_offset), *pdata++);
1250 buf = pdata;
1251 }
1252 /* put anything remaining in the part_buf */
1253 if (cnt) {
1254 dw_mci_set_part_bytes(host, buf, cnt);
1255 /* Push data if we have reached the expected data length */
1256 if ((data->bytes_xfered + init_cnt) ==
1257 (data->blksz * data->blocks))
1258 mci_writew(host, DATA(host->data_offset),
1259 host->part_buf16);
1260 }
1261 }
1262
1263 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1264 {
1265 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1266 if (unlikely((unsigned long)buf & 0x1)) {
1267 while (cnt >= 2) {
1268 /* pull data from fifo into aligned buffer */
1269 u16 aligned_buf[64];
1270 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1271 int items = len >> 1;
1272 int i;
1273 for (i = 0; i < items; ++i)
1274 aligned_buf[i] = mci_readw(host,
1275 DATA(host->data_offset));
1276 /* memcpy from aligned buffer into output buffer */
1277 memcpy(buf, aligned_buf, len);
1278 buf += len;
1279 cnt -= len;
1280 }
1281 } else
1282 #endif
1283 {
1284 u16 *pdata = buf;
1285 for (; cnt >= 2; cnt -= 2)
1286 *pdata++ = mci_readw(host, DATA(host->data_offset));
1287 buf = pdata;
1288 }
1289 if (cnt) {
1290 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1291 dw_mci_pull_final_bytes(host, buf, cnt);
1292 }
1293 }
1294
1295 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1296 {
1297 struct mmc_data *data = host->data;
1298 int init_cnt = cnt;
1299
1300 /* try and push anything in the part_buf */
1301 if (unlikely(host->part_buf_count)) {
1302 int len = dw_mci_push_part_bytes(host, buf, cnt);
1303 buf += len;
1304 cnt -= len;
1305 if (host->part_buf_count == 4) {
1306 mci_writel(host, DATA(host->data_offset),
1307 host->part_buf32);
1308 host->part_buf_count = 0;
1309 }
1310 }
1311 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1312 if (unlikely((unsigned long)buf & 0x3)) {
1313 while (cnt >= 4) {
1314 u32 aligned_buf[32];
1315 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1316 int items = len >> 2;
1317 int i;
1318 /* memcpy from input buffer into aligned buffer */
1319 memcpy(aligned_buf, buf, len);
1320 buf += len;
1321 cnt -= len;
1322 /* push data from aligned buffer into fifo */
1323 for (i = 0; i < items; ++i)
1324 mci_writel(host, DATA(host->data_offset),
1325 aligned_buf[i]);
1326 }
1327 } else
1328 #endif
1329 {
1330 u32 *pdata = buf;
1331 for (; cnt >= 4; cnt -= 4)
1332 mci_writel(host, DATA(host->data_offset), *pdata++);
1333 buf = pdata;
1334 }
1335 /* put anything remaining in the part_buf */
1336 if (cnt) {
1337 dw_mci_set_part_bytes(host, buf, cnt);
1338 /* Push data if we have reached the expected data length */
1339 if ((data->bytes_xfered + init_cnt) ==
1340 (data->blksz * data->blocks))
1341 mci_writel(host, DATA(host->data_offset),
1342 host->part_buf32);
1343 }
1344 }
1345
1346 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1347 {
1348 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1349 if (unlikely((unsigned long)buf & 0x3)) {
1350 while (cnt >= 4) {
1351 /* pull data from fifo into aligned buffer */
1352 u32 aligned_buf[32];
1353 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1354 int items = len >> 2;
1355 int i;
1356 for (i = 0; i < items; ++i)
1357 aligned_buf[i] = mci_readl(host,
1358 DATA(host->data_offset));
1359 /* memcpy from aligned buffer into output buffer */
1360 memcpy(buf, aligned_buf, len);
1361 buf += len;
1362 cnt -= len;
1363 }
1364 } else
1365 #endif
1366 {
1367 u32 *pdata = buf;
1368 for (; cnt >= 4; cnt -= 4)
1369 *pdata++ = mci_readl(host, DATA(host->data_offset));
1370 buf = pdata;
1371 }
1372 if (cnt) {
1373 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1374 dw_mci_pull_final_bytes(host, buf, cnt);
1375 }
1376 }
1377
1378 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1379 {
1380 struct mmc_data *data = host->data;
1381 int init_cnt = cnt;
1382
1383 /* try and push anything in the part_buf */
1384 if (unlikely(host->part_buf_count)) {
1385 int len = dw_mci_push_part_bytes(host, buf, cnt);
1386 buf += len;
1387 cnt -= len;
1388
1389 if (host->part_buf_count == 8) {
1390 mci_writeq(host, DATA(host->data_offset),
1391 host->part_buf);
1392 host->part_buf_count = 0;
1393 }
1394 }
1395 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1396 if (unlikely((unsigned long)buf & 0x7)) {
1397 while (cnt >= 8) {
1398 u64 aligned_buf[16];
1399 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1400 int items = len >> 3;
1401 int i;
1402 /* memcpy from input buffer into aligned buffer */
1403 memcpy(aligned_buf, buf, len);
1404 buf += len;
1405 cnt -= len;
1406 /* push data from aligned buffer into fifo */
1407 for (i = 0; i < items; ++i)
1408 mci_writeq(host, DATA(host->data_offset),
1409 aligned_buf[i]);
1410 }
1411 } else
1412 #endif
1413 {
1414 u64 *pdata = buf;
1415 for (; cnt >= 8; cnt -= 8)
1416 mci_writeq(host, DATA(host->data_offset), *pdata++);
1417 buf = pdata;
1418 }
1419 /* put anything remaining in the part_buf */
1420 if (cnt) {
1421 dw_mci_set_part_bytes(host, buf, cnt);
1422 /* Push data if we have reached the expected data length */
1423 if ((data->bytes_xfered + init_cnt) ==
1424 (data->blksz * data->blocks))
1425 mci_writeq(host, DATA(host->data_offset),
1426 host->part_buf);
1427 }
1428 }
1429
1430 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1431 {
1432 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1433 if (unlikely((unsigned long)buf & 0x7)) {
1434 while (cnt >= 8) {
1435 /* pull data from fifo into aligned buffer */
1436 u64 aligned_buf[16];
1437 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1438 int items = len >> 3;
1439 int i;
1440 for (i = 0; i < items; ++i)
1441 aligned_buf[i] = mci_readq(host,
1442 DATA(host->data_offset));
1443 /* memcpy from aligned buffer into output buffer */
1444 memcpy(buf, aligned_buf, len);
1445 buf += len;
1446 cnt -= len;
1447 }
1448 } else
1449 #endif
1450 {
1451 u64 *pdata = buf;
1452 for (; cnt >= 8; cnt -= 8)
1453 *pdata++ = mci_readq(host, DATA(host->data_offset));
1454 buf = pdata;
1455 }
1456 if (cnt) {
1457 host->part_buf = mci_readq(host, DATA(host->data_offset));
1458 dw_mci_pull_final_bytes(host, buf, cnt);
1459 }
1460 }
1461
1462 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1463 {
1464 int len;
1465
1466 /* get remaining partial bytes */
1467 len = dw_mci_pull_part_bytes(host, buf, cnt);
1468 if (unlikely(len == cnt))
1469 return;
1470 buf += len;
1471 cnt -= len;
1472
1473 /* get the rest of the data */
1474 host->pull_data(host, buf, cnt);
1475 }
1476
1477 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
1478 {
1479 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1480 void *buf;
1481 unsigned int offset;
1482 struct mmc_data *data = host->data;
1483 int shift = host->data_shift;
1484 u32 status;
1485 unsigned int len;
1486 unsigned int remain, fcnt;
1487
1488 do {
1489 if (!sg_miter_next(sg_miter))
1490 goto done;
1491
1492 host->sg = sg_miter->piter.sg;
1493 buf = sg_miter->addr;
1494 remain = sg_miter->length;
1495 offset = 0;
1496
1497 do {
1498 fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
1499 << shift) + host->part_buf_count;
1500 len = min(remain, fcnt);
1501 if (!len)
1502 break;
1503 dw_mci_pull_data(host, (void *)(buf + offset), len);
1504 data->bytes_xfered += len;
1505 offset += len;
1506 remain -= len;
1507 } while (remain);
1508
1509 sg_miter->consumed = offset;
1510 status = mci_readl(host, MINTSTS);
1511 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1512 /* if the RXDR is ready read again */
1513 } while ((status & SDMMC_INT_RXDR) ||
1514 (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
1515
1516 if (!remain) {
1517 if (!sg_miter_next(sg_miter))
1518 goto done;
1519 sg_miter->consumed = 0;
1520 }
1521 sg_miter_stop(sg_miter);
1522 return;
1523
1524 done:
1525 sg_miter_stop(sg_miter);
1526 host->sg = NULL;
1527 smp_wmb();
1528 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1529 }
1530
1531 static void dw_mci_write_data_pio(struct dw_mci *host)
1532 {
1533 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1534 void *buf;
1535 unsigned int offset;
1536 struct mmc_data *data = host->data;
1537 int shift = host->data_shift;
1538 u32 status;
1539 unsigned int len;
1540 unsigned int fifo_depth = host->fifo_depth;
1541 unsigned int remain, fcnt;
1542
1543 do {
1544 if (!sg_miter_next(sg_miter))
1545 goto done;
1546
1547 host->sg = sg_miter->piter.sg;
1548 buf = sg_miter->addr;
1549 remain = sg_miter->length;
1550 offset = 0;
1551
1552 do {
1553 fcnt = ((fifo_depth -
1554 SDMMC_GET_FCNT(mci_readl(host, STATUS)))
1555 << shift) - host->part_buf_count;
1556 len = min(remain, fcnt);
1557 if (!len)
1558 break;
1559 host->push_data(host, (void *)(buf + offset), len);
1560 data->bytes_xfered += len;
1561 offset += len;
1562 remain -= len;
1563 } while (remain);
1564
1565 sg_miter->consumed = offset;
1566 status = mci_readl(host, MINTSTS);
1567 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1568 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1569
1570 if (!remain) {
1571 if (!sg_miter_next(sg_miter))
1572 goto done;
1573 sg_miter->consumed = 0;
1574 }
1575 sg_miter_stop(sg_miter);
1576 return;
1577
1578 done:
1579 sg_miter_stop(sg_miter);
1580 host->sg = NULL;
1581 smp_wmb();
1582 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1583 }
1584
1585 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1586 {
1587 if (!host->cmd_status)
1588 host->cmd_status = status;
1589
1590 smp_wmb();
1591
1592 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1593 tasklet_schedule(&host->tasklet);
1594 }
1595
1596 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1597 {
1598 struct dw_mci *host = dev_id;
1599 u32 pending;
1600 int i;
1601
1602 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1603
1604 /*
1605 * DTO fix - version 2.10a and below, and only if internal DMA
1606 * is configured.
1607 */
1608 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1609 if (!pending &&
1610 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1611 pending |= SDMMC_INT_DATA_OVER;
1612 }
1613
1614 if (pending) {
1615 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1616 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1617 host->cmd_status = pending;
1618 smp_wmb();
1619 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1620 }
1621
1622 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1623 /* if there is an error report DATA_ERROR */
1624 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1625 host->data_status = pending;
1626 smp_wmb();
1627 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1628 tasklet_schedule(&host->tasklet);
1629 }
1630
1631 if (pending & SDMMC_INT_DATA_OVER) {
1632 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1633 if (!host->data_status)
1634 host->data_status = pending;
1635 smp_wmb();
1636 if (host->dir_status == DW_MCI_RECV_STATUS) {
1637 if (host->sg != NULL)
1638 dw_mci_read_data_pio(host, true);
1639 }
1640 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1641 tasklet_schedule(&host->tasklet);
1642 }
1643
1644 if (pending & SDMMC_INT_RXDR) {
1645 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1646 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1647 dw_mci_read_data_pio(host, false);
1648 }
1649
1650 if (pending & SDMMC_INT_TXDR) {
1651 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1652 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1653 dw_mci_write_data_pio(host);
1654 }
1655
1656 if (pending & SDMMC_INT_CMD_DONE) {
1657 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1658 dw_mci_cmd_interrupt(host, pending);
1659 }
1660
1661 if (pending & SDMMC_INT_CD) {
1662 mci_writel(host, RINTSTS, SDMMC_INT_CD);
1663 queue_work(host->card_workqueue, &host->card_work);
1664 }
1665
1666 /* Handle SDIO Interrupts */
1667 for (i = 0; i < host->num_slots; i++) {
1668 struct dw_mci_slot *slot = host->slot[i];
1669 if (pending & SDMMC_INT_SDIO(i)) {
1670 mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
1671 mmc_signal_sdio_irq(slot->mmc);
1672 }
1673 }
1674
1675 }
1676
1677 #ifdef CONFIG_MMC_DW_IDMAC
1678 /* Handle DMA interrupts */
1679 pending = mci_readl(host, IDSTS);
1680 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1681 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1682 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1683 host->dma_ops->complete(host);
1684 }
1685 #endif
1686
1687 return IRQ_HANDLED;
1688 }
1689
1690 static void dw_mci_work_routine_card(struct work_struct *work)
1691 {
1692 struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1693 int i;
1694
1695 for (i = 0; i < host->num_slots; i++) {
1696 struct dw_mci_slot *slot = host->slot[i];
1697 struct mmc_host *mmc = slot->mmc;
1698 struct mmc_request *mrq;
1699 int present;
1700 u32 ctrl;
1701
1702 present = dw_mci_get_cd(mmc);
1703 while (present != slot->last_detect_state) {
1704 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1705 present ? "inserted" : "removed");
1706
1707 spin_lock_bh(&host->lock);
1708
1709 /* Card change detected */
1710 slot->last_detect_state = present;
1711
1712 /* Mark card as present if applicable */
1713 if (present != 0)
1714 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1715
1716 /* Clean up queue if present */
1717 mrq = slot->mrq;
1718 if (mrq) {
1719 if (mrq == host->mrq) {
1720 host->data = NULL;
1721 host->cmd = NULL;
1722
1723 switch (host->state) {
1724 case STATE_IDLE:
1725 break;
1726 case STATE_SENDING_CMD:
1727 mrq->cmd->error = -ENOMEDIUM;
1728 if (!mrq->data)
1729 break;
1730 /* fall through */
1731 case STATE_SENDING_DATA:
1732 mrq->data->error = -ENOMEDIUM;
1733 dw_mci_stop_dma(host);
1734 break;
1735 case STATE_DATA_BUSY:
1736 case STATE_DATA_ERROR:
1737 if (mrq->data->error == -EINPROGRESS)
1738 mrq->data->error = -ENOMEDIUM;
1739 if (!mrq->stop)
1740 break;
1741 /* fall through */
1742 case STATE_SENDING_STOP:
1743 mrq->stop->error = -ENOMEDIUM;
1744 break;
1745 }
1746
1747 dw_mci_request_end(host, mrq);
1748 } else {
1749 list_del(&slot->queue_node);
1750 mrq->cmd->error = -ENOMEDIUM;
1751 if (mrq->data)
1752 mrq->data->error = -ENOMEDIUM;
1753 if (mrq->stop)
1754 mrq->stop->error = -ENOMEDIUM;
1755
1756 spin_unlock(&host->lock);
1757 mmc_request_done(slot->mmc, mrq);
1758 spin_lock(&host->lock);
1759 }
1760 }
1761
1762 /* Power down slot */
1763 if (present == 0) {
1764 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1765
1766 /*
1767 * Clear down the FIFO - doing so generates a
1768 * block interrupt, hence setting the
1769 * scatter-gather pointer to NULL.
1770 */
1771 sg_miter_stop(&host->sg_miter);
1772 host->sg = NULL;
1773
1774 ctrl = mci_readl(host, CTRL);
1775 ctrl |= SDMMC_CTRL_FIFO_RESET;
1776 mci_writel(host, CTRL, ctrl);
1777
1778 #ifdef CONFIG_MMC_DW_IDMAC
1779 ctrl = mci_readl(host, BMOD);
1780 /* Software reset of DMA */
1781 ctrl |= SDMMC_IDMAC_SWRESET;
1782 mci_writel(host, BMOD, ctrl);
1783 #endif
1784
1785 }
1786
1787 spin_unlock_bh(&host->lock);
1788
1789 present = dw_mci_get_cd(mmc);
1790 }
1791
1792 mmc_detect_change(slot->mmc,
1793 msecs_to_jiffies(host->pdata->detect_delay_ms));
1794 }
1795 }
1796
1797 #ifdef CONFIG_OF
1798 /* given a slot id, find out the device node representing that slot */
1799 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
1800 {
1801 struct device_node *np;
1802 const __be32 *addr;
1803 int len;
1804
1805 if (!dev || !dev->of_node)
1806 return NULL;
1807
1808 for_each_child_of_node(dev->of_node, np) {
1809 addr = of_get_property(np, "reg", &len);
1810 if (!addr || (len < sizeof(int)))
1811 continue;
1812 if (be32_to_cpup(addr) == slot)
1813 return np;
1814 }
1815 return NULL;
1816 }
1817
1818 static struct dw_mci_of_slot_quirks {
1819 char *quirk;
1820 int id;
1821 } of_slot_quirks[] = {
1822 {
1823 .quirk = "disable-wp",
1824 .id = DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT,
1825 },
1826 };
1827
1828 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
1829 {
1830 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
1831 int quirks = 0;
1832 int idx;
1833
1834 /* get quirks */
1835 for (idx = 0; idx < ARRAY_SIZE(of_slot_quirks); idx++)
1836 if (of_get_property(np, of_slot_quirks[idx].quirk, NULL))
1837 quirks |= of_slot_quirks[idx].id;
1838
1839 return quirks;
1840 }
1841
1842 /* find out bus-width for a given slot */
1843 static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
1844 {
1845 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
1846 u32 bus_wd = 1;
1847
1848 if (!np)
1849 return 1;
1850
1851 if (of_property_read_u32(np, "bus-width", &bus_wd))
1852 dev_err(dev, "bus-width property not found, assuming width"
1853 " as 1\n");
1854 return bus_wd;
1855 }
1856
1857 /* find the write protect gpio for a given slot; or -1 if none specified */
1858 static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
1859 {
1860 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
1861 int gpio;
1862
1863 if (!np)
1864 return -EINVAL;
1865
1866 gpio = of_get_named_gpio(np, "wp-gpios", 0);
1867
1868 /* Having a missing entry is valid; return silently */
1869 if (!gpio_is_valid(gpio))
1870 return -EINVAL;
1871
1872 if (devm_gpio_request(dev, gpio, "dw-mci-wp")) {
1873 dev_warn(dev, "gpio [%d] request failed\n", gpio);
1874 return -EINVAL;
1875 }
1876
1877 return gpio;
1878 }
1879 #else /* CONFIG_OF */
1880 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
1881 {
1882 return 0;
1883 }
1884 static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
1885 {
1886 return 1;
1887 }
1888 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
1889 {
1890 return NULL;
1891 }
1892 static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
1893 {
1894 return -EINVAL;
1895 }
1896 #endif /* CONFIG_OF */
1897
1898 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
1899 {
1900 struct mmc_host *mmc;
1901 struct dw_mci_slot *slot;
1902 const struct dw_mci_drv_data *drv_data = host->drv_data;
1903 int ctrl_id, ret;
1904 u8 bus_width;
1905
1906 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
1907 if (!mmc)
1908 return -ENOMEM;
1909
1910 slot = mmc_priv(mmc);
1911 slot->id = id;
1912 slot->mmc = mmc;
1913 slot->host = host;
1914 host->slot[id] = slot;
1915
1916 slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
1917
1918 mmc->ops = &dw_mci_ops;
1919 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
1920 mmc->f_max = host->bus_hz;
1921
1922 if (host->pdata->get_ocr)
1923 mmc->ocr_avail = host->pdata->get_ocr(id);
1924 else
1925 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1926
1927 /*
1928 * Start with slot power disabled, it will be enabled when a card
1929 * is detected.
1930 */
1931 if (host->pdata->setpower)
1932 host->pdata->setpower(id, 0);
1933
1934 if (host->pdata->caps)
1935 mmc->caps = host->pdata->caps;
1936
1937 if (host->pdata->pm_caps)
1938 mmc->pm_caps = host->pdata->pm_caps;
1939
1940 if (host->dev->of_node) {
1941 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
1942 if (ctrl_id < 0)
1943 ctrl_id = 0;
1944 } else {
1945 ctrl_id = to_platform_device(host->dev)->id;
1946 }
1947 if (drv_data && drv_data->caps)
1948 mmc->caps |= drv_data->caps[ctrl_id];
1949
1950 if (host->pdata->caps2)
1951 mmc->caps2 = host->pdata->caps2;
1952
1953 if (host->pdata->get_bus_wd)
1954 bus_width = host->pdata->get_bus_wd(slot->id);
1955 else if (host->dev->of_node)
1956 bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id);
1957 else
1958 bus_width = 1;
1959
1960 switch (bus_width) {
1961 case 8:
1962 mmc->caps |= MMC_CAP_8_BIT_DATA;
1963 case 4:
1964 mmc->caps |= MMC_CAP_4_BIT_DATA;
1965 }
1966
1967 if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
1968 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
1969
1970 if (host->pdata->blk_settings) {
1971 mmc->max_segs = host->pdata->blk_settings->max_segs;
1972 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
1973 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
1974 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
1975 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
1976 } else {
1977 /* Useful defaults if platform data is unset. */
1978 #ifdef CONFIG_MMC_DW_IDMAC
1979 mmc->max_segs = host->ring_size;
1980 mmc->max_blk_size = 65536;
1981 mmc->max_blk_count = host->ring_size;
1982 mmc->max_seg_size = 0x1000;
1983 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
1984 #else
1985 mmc->max_segs = 64;
1986 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
1987 mmc->max_blk_count = 512;
1988 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1989 mmc->max_seg_size = mmc->max_req_size;
1990 #endif /* CONFIG_MMC_DW_IDMAC */
1991 }
1992
1993 if (dw_mci_get_cd(mmc))
1994 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1995 else
1996 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1997
1998 slot->wp_gpio = dw_mci_of_get_wp_gpio(host->dev, slot->id);
1999
2000 ret = mmc_add_host(mmc);
2001 if (ret)
2002 goto err_setup_bus;
2003
2004 #if defined(CONFIG_DEBUG_FS)
2005 dw_mci_init_debugfs(slot);
2006 #endif
2007
2008 /* Card initially undetected */
2009 slot->last_detect_state = 0;
2010
2011 /*
2012 * Card may have been plugged in prior to boot so we
2013 * need to run the detect tasklet
2014 */
2015 queue_work(host->card_workqueue, &host->card_work);
2016
2017 return 0;
2018
2019 err_setup_bus:
2020 mmc_free_host(mmc);
2021 return -EINVAL;
2022 }
2023
2024 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2025 {
2026 /* Shutdown detect IRQ */
2027 if (slot->host->pdata->exit)
2028 slot->host->pdata->exit(id);
2029
2030 /* Debugfs stuff is cleaned up by mmc core */
2031 mmc_remove_host(slot->mmc);
2032 slot->host->slot[id] = NULL;
2033 mmc_free_host(slot->mmc);
2034 }
2035
2036 static void dw_mci_init_dma(struct dw_mci *host)
2037 {
2038 /* Alloc memory for sg translation */
2039 host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2040 &host->sg_dma, GFP_KERNEL);
2041 if (!host->sg_cpu) {
2042 dev_err(host->dev, "%s: could not alloc DMA memory\n",
2043 __func__);
2044 goto no_dma;
2045 }
2046
2047 /* Determine which DMA interface to use */
2048 #ifdef CONFIG_MMC_DW_IDMAC
2049 host->dma_ops = &dw_mci_idmac_ops;
2050 dev_info(host->dev, "Using internal DMA controller.\n");
2051 #endif
2052
2053 if (!host->dma_ops)
2054 goto no_dma;
2055
2056 if (host->dma_ops->init && host->dma_ops->start &&
2057 host->dma_ops->stop && host->dma_ops->cleanup) {
2058 if (host->dma_ops->init(host)) {
2059 dev_err(host->dev, "%s: Unable to initialize "
2060 "DMA Controller.\n", __func__);
2061 goto no_dma;
2062 }
2063 } else {
2064 dev_err(host->dev, "DMA initialization not found.\n");
2065 goto no_dma;
2066 }
2067
2068 host->use_dma = 1;
2069 return;
2070
2071 no_dma:
2072 dev_info(host->dev, "Using PIO mode.\n");
2073 host->use_dma = 0;
2074 return;
2075 }
2076
2077 static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
2078 {
2079 unsigned long timeout = jiffies + msecs_to_jiffies(500);
2080 unsigned int ctrl;
2081
2082 mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
2083 SDMMC_CTRL_DMA_RESET));
2084
2085 /* wait till resets clear */
2086 do {
2087 ctrl = mci_readl(host, CTRL);
2088 if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
2089 SDMMC_CTRL_DMA_RESET)))
2090 return true;
2091 } while (time_before(jiffies, timeout));
2092
2093 dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
2094
2095 return false;
2096 }
2097
2098 #ifdef CONFIG_OF
2099 static struct dw_mci_of_quirks {
2100 char *quirk;
2101 int id;
2102 } of_quirks[] = {
2103 {
2104 .quirk = "supports-highspeed",
2105 .id = DW_MCI_QUIRK_HIGHSPEED,
2106 }, {
2107 .quirk = "broken-cd",
2108 .id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
2109 },
2110 };
2111
2112 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2113 {
2114 struct dw_mci_board *pdata;
2115 struct device *dev = host->dev;
2116 struct device_node *np = dev->of_node;
2117 const struct dw_mci_drv_data *drv_data = host->drv_data;
2118 int idx, ret;
2119 u32 clock_frequency;
2120
2121 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2122 if (!pdata) {
2123 dev_err(dev, "could not allocate memory for pdata\n");
2124 return ERR_PTR(-ENOMEM);
2125 }
2126
2127 /* find out number of slots supported */
2128 if (of_property_read_u32(dev->of_node, "num-slots",
2129 &pdata->num_slots)) {
2130 dev_info(dev, "num-slots property not found, "
2131 "assuming 1 slot is available\n");
2132 pdata->num_slots = 1;
2133 }
2134
2135 /* get quirks */
2136 for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
2137 if (of_get_property(np, of_quirks[idx].quirk, NULL))
2138 pdata->quirks |= of_quirks[idx].id;
2139
2140 if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2141 dev_info(dev, "fifo-depth property not found, using "
2142 "value of FIFOTH register as default\n");
2143
2144 of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2145
2146 if (!of_property_read_u32(np, "clock-frequency", &clock_frequency))
2147 pdata->bus_hz = clock_frequency;
2148
2149 if (drv_data && drv_data->parse_dt) {
2150 ret = drv_data->parse_dt(host);
2151 if (ret)
2152 return ERR_PTR(ret);
2153 }
2154
2155 if (of_find_property(np, "keep-power-in-suspend", NULL))
2156 pdata->pm_caps |= MMC_PM_KEEP_POWER;
2157
2158 if (of_find_property(np, "enable-sdio-wakeup", NULL))
2159 pdata->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
2160
2161 return pdata;
2162 }
2163
2164 #else /* CONFIG_OF */
2165 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2166 {
2167 return ERR_PTR(-EINVAL);
2168 }
2169 #endif /* CONFIG_OF */
2170
2171 int dw_mci_probe(struct dw_mci *host)
2172 {
2173 const struct dw_mci_drv_data *drv_data = host->drv_data;
2174 int width, i, ret = 0;
2175 u32 fifo_size;
2176 int init_slots = 0;
2177
2178 if (!host->pdata) {
2179 host->pdata = dw_mci_parse_dt(host);
2180 if (IS_ERR(host->pdata)) {
2181 dev_err(host->dev, "platform data not available\n");
2182 return -EINVAL;
2183 }
2184 }
2185
2186 if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
2187 dev_err(host->dev,
2188 "Platform data must supply select_slot function\n");
2189 return -ENODEV;
2190 }
2191
2192 host->biu_clk = devm_clk_get(host->dev, "biu");
2193 if (IS_ERR(host->biu_clk)) {
2194 dev_dbg(host->dev, "biu clock not available\n");
2195 } else {
2196 ret = clk_prepare_enable(host->biu_clk);
2197 if (ret) {
2198 dev_err(host->dev, "failed to enable biu clock\n");
2199 return ret;
2200 }
2201 }
2202
2203 host->ciu_clk = devm_clk_get(host->dev, "ciu");
2204 if (IS_ERR(host->ciu_clk)) {
2205 dev_dbg(host->dev, "ciu clock not available\n");
2206 host->bus_hz = host->pdata->bus_hz;
2207 } else {
2208 ret = clk_prepare_enable(host->ciu_clk);
2209 if (ret) {
2210 dev_err(host->dev, "failed to enable ciu clock\n");
2211 goto err_clk_biu;
2212 }
2213
2214 if (host->pdata->bus_hz) {
2215 ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz);
2216 if (ret)
2217 dev_warn(host->dev,
2218 "Unable to set bus rate to %ul\n",
2219 host->pdata->bus_hz);
2220 }
2221 host->bus_hz = clk_get_rate(host->ciu_clk);
2222 }
2223
2224 if (drv_data && drv_data->setup_clock) {
2225 ret = drv_data->setup_clock(host);
2226 if (ret) {
2227 dev_err(host->dev,
2228 "implementation specific clock setup failed\n");
2229 goto err_clk_ciu;
2230 }
2231 }
2232
2233 host->vmmc = devm_regulator_get_optional(host->dev, "vmmc");
2234 if (IS_ERR(host->vmmc)) {
2235 ret = PTR_ERR(host->vmmc);
2236 if (ret == -EPROBE_DEFER)
2237 goto err_clk_ciu;
2238
2239 dev_info(host->dev, "no vmmc regulator found: %d\n", ret);
2240 host->vmmc = NULL;
2241 } else {
2242 ret = regulator_enable(host->vmmc);
2243 if (ret) {
2244 if (ret != -EPROBE_DEFER)
2245 dev_err(host->dev,
2246 "regulator_enable fail: %d\n", ret);
2247 goto err_clk_ciu;
2248 }
2249 }
2250
2251 if (!host->bus_hz) {
2252 dev_err(host->dev,
2253 "Platform data must supply bus speed\n");
2254 ret = -ENODEV;
2255 goto err_regulator;
2256 }
2257
2258 host->quirks = host->pdata->quirks;
2259
2260 spin_lock_init(&host->lock);
2261 INIT_LIST_HEAD(&host->queue);
2262
2263 /*
2264 * Get the host data width - this assumes that HCON has been set with
2265 * the correct values.
2266 */
2267 i = (mci_readl(host, HCON) >> 7) & 0x7;
2268 if (!i) {
2269 host->push_data = dw_mci_push_data16;
2270 host->pull_data = dw_mci_pull_data16;
2271 width = 16;
2272 host->data_shift = 1;
2273 } else if (i == 2) {
2274 host->push_data = dw_mci_push_data64;
2275 host->pull_data = dw_mci_pull_data64;
2276 width = 64;
2277 host->data_shift = 3;
2278 } else {
2279 /* Check for a reserved value, and warn if it is */
2280 WARN((i != 1),
2281 "HCON reports a reserved host data width!\n"
2282 "Defaulting to 32-bit access.\n");
2283 host->push_data = dw_mci_push_data32;
2284 host->pull_data = dw_mci_pull_data32;
2285 width = 32;
2286 host->data_shift = 2;
2287 }
2288
2289 /* Reset all blocks */
2290 if (!mci_wait_reset(host->dev, host))
2291 return -ENODEV;
2292
2293 host->dma_ops = host->pdata->dma_ops;
2294 dw_mci_init_dma(host);
2295
2296 /* Clear the interrupts for the host controller */
2297 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2298 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2299
2300 /* Put in max timeout */
2301 mci_writel(host, TMOUT, 0xFFFFFFFF);
2302
2303 /*
2304 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
2305 * Tx Mark = fifo_size / 2 DMA Size = 8
2306 */
2307 if (!host->pdata->fifo_depth) {
2308 /*
2309 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2310 * have been overwritten by the bootloader, just like we're
2311 * about to do, so if you know the value for your hardware, you
2312 * should put it in the platform data.
2313 */
2314 fifo_size = mci_readl(host, FIFOTH);
2315 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2316 } else {
2317 fifo_size = host->pdata->fifo_depth;
2318 }
2319 host->fifo_depth = fifo_size;
2320 host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
2321 ((fifo_size/2) << 0));
2322 mci_writel(host, FIFOTH, host->fifoth_val);
2323
2324 /* disable clock to CIU */
2325 mci_writel(host, CLKENA, 0);
2326 mci_writel(host, CLKSRC, 0);
2327
2328 /*
2329 * In 2.40a spec, Data offset is changed.
2330 * Need to check the version-id and set data-offset for DATA register.
2331 */
2332 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2333 dev_info(host->dev, "Version ID is %04x\n", host->verid);
2334
2335 if (host->verid < DW_MMC_240A)
2336 host->data_offset = DATA_OFFSET;
2337 else
2338 host->data_offset = DATA_240A_OFFSET;
2339
2340 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2341 host->card_workqueue = alloc_workqueue("dw-mci-card",
2342 WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
2343 if (!host->card_workqueue) {
2344 ret = -ENOMEM;
2345 goto err_dmaunmap;
2346 }
2347 INIT_WORK(&host->card_work, dw_mci_work_routine_card);
2348 ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
2349 host->irq_flags, "dw-mci", host);
2350 if (ret)
2351 goto err_workqueue;
2352
2353 if (host->pdata->num_slots)
2354 host->num_slots = host->pdata->num_slots;
2355 else
2356 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2357
2358 /*
2359 * Enable interrupts for command done, data over, data empty, card det,
2360 * receive ready and error such as transmit, receive timeout, crc error
2361 */
2362 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2363 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2364 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2365 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2366 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2367
2368 dev_info(host->dev, "DW MMC controller at irq %d, "
2369 "%d bit host data width, "
2370 "%u deep fifo\n",
2371 host->irq, width, fifo_size);
2372
2373 /* We need at least one slot to succeed */
2374 for (i = 0; i < host->num_slots; i++) {
2375 ret = dw_mci_init_slot(host, i);
2376 if (ret)
2377 dev_dbg(host->dev, "slot %d init failed\n", i);
2378 else
2379 init_slots++;
2380 }
2381
2382 if (init_slots) {
2383 dev_info(host->dev, "%d slots initialized\n", init_slots);
2384 } else {
2385 dev_dbg(host->dev, "attempted to initialize %d slots, "
2386 "but failed on all\n", host->num_slots);
2387 goto err_workqueue;
2388 }
2389
2390 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2391 dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
2392
2393 return 0;
2394
2395 err_workqueue:
2396 destroy_workqueue(host->card_workqueue);
2397
2398 err_dmaunmap:
2399 if (host->use_dma && host->dma_ops->exit)
2400 host->dma_ops->exit(host);
2401
2402 err_regulator:
2403 if (host->vmmc)
2404 regulator_disable(host->vmmc);
2405
2406 err_clk_ciu:
2407 if (!IS_ERR(host->ciu_clk))
2408 clk_disable_unprepare(host->ciu_clk);
2409
2410 err_clk_biu:
2411 if (!IS_ERR(host->biu_clk))
2412 clk_disable_unprepare(host->biu_clk);
2413
2414 return ret;
2415 }
2416 EXPORT_SYMBOL(dw_mci_probe);
2417
2418 void dw_mci_remove(struct dw_mci *host)
2419 {
2420 int i;
2421
2422 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2423 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2424
2425 for (i = 0; i < host->num_slots; i++) {
2426 dev_dbg(host->dev, "remove slot %d\n", i);
2427 if (host->slot[i])
2428 dw_mci_cleanup_slot(host->slot[i], i);
2429 }
2430
2431 /* disable clock to CIU */
2432 mci_writel(host, CLKENA, 0);
2433 mci_writel(host, CLKSRC, 0);
2434
2435 destroy_workqueue(host->card_workqueue);
2436
2437 if (host->use_dma && host->dma_ops->exit)
2438 host->dma_ops->exit(host);
2439
2440 if (host->vmmc)
2441 regulator_disable(host->vmmc);
2442
2443 if (!IS_ERR(host->ciu_clk))
2444 clk_disable_unprepare(host->ciu_clk);
2445
2446 if (!IS_ERR(host->biu_clk))
2447 clk_disable_unprepare(host->biu_clk);
2448 }
2449 EXPORT_SYMBOL(dw_mci_remove);
2450
2451
2452
2453 #ifdef CONFIG_PM_SLEEP
2454 /*
2455 * TODO: we should probably disable the clock to the card in the suspend path.
2456 */
2457 int dw_mci_suspend(struct dw_mci *host)
2458 {
2459 int i, ret = 0;
2460
2461 for (i = 0; i < host->num_slots; i++) {
2462 struct dw_mci_slot *slot = host->slot[i];
2463 if (!slot)
2464 continue;
2465 ret = mmc_suspend_host(slot->mmc);
2466 if (ret < 0) {
2467 while (--i >= 0) {
2468 slot = host->slot[i];
2469 if (slot)
2470 mmc_resume_host(host->slot[i]->mmc);
2471 }
2472 return ret;
2473 }
2474 }
2475
2476 if (host->vmmc)
2477 regulator_disable(host->vmmc);
2478
2479 return 0;
2480 }
2481 EXPORT_SYMBOL(dw_mci_suspend);
2482
2483 int dw_mci_resume(struct dw_mci *host)
2484 {
2485 int i, ret;
2486
2487 if (host->vmmc) {
2488 ret = regulator_enable(host->vmmc);
2489 if (ret) {
2490 dev_err(host->dev,
2491 "failed to enable regulator: %d\n", ret);
2492 return ret;
2493 }
2494 }
2495
2496 if (!mci_wait_reset(host->dev, host)) {
2497 ret = -ENODEV;
2498 return ret;
2499 }
2500
2501 if (host->use_dma && host->dma_ops->init)
2502 host->dma_ops->init(host);
2503
2504 /* Restore the old value at FIFOTH register */
2505 mci_writel(host, FIFOTH, host->fifoth_val);
2506
2507 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2508 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2509 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2510 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2511 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2512
2513 for (i = 0; i < host->num_slots; i++) {
2514 struct dw_mci_slot *slot = host->slot[i];
2515 if (!slot)
2516 continue;
2517 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
2518 dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
2519 dw_mci_setup_bus(slot, true);
2520 }
2521
2522 ret = mmc_resume_host(host->slot[i]->mmc);
2523 if (ret < 0)
2524 return ret;
2525 }
2526 return 0;
2527 }
2528 EXPORT_SYMBOL(dw_mci_resume);
2529 #endif /* CONFIG_PM_SLEEP */
2530
2531 static int __init dw_mci_init(void)
2532 {
2533 pr_info("Synopsys Designware Multimedia Card Interface Driver\n");
2534 return 0;
2535 }
2536
2537 static void __exit dw_mci_exit(void)
2538 {
2539 }
2540
2541 module_init(dw_mci_init);
2542 module_exit(dw_mci_exit);
2543
2544 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2545 MODULE_AUTHOR("NXP Semiconductor VietNam");
2546 MODULE_AUTHOR("Imagination Technologies Ltd");
2547 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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