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ipv[4|6]: correct dropwatch false positive in local_deliver_finish
[linux/fpc-iii.git] / drivers / mmc / host / dw_mmc.c
blob60063ccb4c4bef775c7ef3766040600e0be3e998
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_DTO | 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 struct idmac_desc {
55 u32 des0; /* Control Descriptor */
56 #define IDMAC_DES0_DIC BIT(1)
57 #define IDMAC_DES0_LD BIT(2)
58 #define IDMAC_DES0_FD BIT(3)
59 #define IDMAC_DES0_CH BIT(4)
60 #define IDMAC_DES0_ER BIT(5)
61 #define IDMAC_DES0_CES BIT(30)
62 #define IDMAC_DES0_OWN BIT(31)
63
64 u32 des1; /* Buffer sizes */
65 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
66 ((d)->des1 = ((d)->des1 & 0x03ffe000) | ((s) & 0x1fff))
67
68 u32 des2; /* buffer 1 physical address */
69
70 u32 des3; /* buffer 2 physical address */
71 };
72 #endif /* CONFIG_MMC_DW_IDMAC */
73
74 /**
75 * struct dw_mci_slot - MMC slot state
76 * @mmc: The mmc_host representing this slot.
77 * @host: The MMC controller this slot is using.
78 * @quirks: Slot-level quirks (DW_MCI_SLOT_QUIRK_XXX)
79 * @wp_gpio: If gpio_is_valid() we'll use this to read write protect.
80 * @ctype: Card type for this slot.
81 * @mrq: mmc_request currently being processed or waiting to be
82 * processed, or NULL when the slot is idle.
83 * @queue_node: List node for placing this node in the @queue list of
84 * &struct dw_mci.
85 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
86 * @flags: Random state bits associated with the slot.
87 * @id: Number of this slot.
88 * @last_detect_state: Most recently observed card detect state.
89 */
90 struct dw_mci_slot {
91 struct mmc_host *mmc;
92 struct dw_mci *host;
93
94 int quirks;
95 int wp_gpio;
96
97 u32 ctype;
98
99 struct mmc_request *mrq;
100 struct list_head queue_node;
101
102 unsigned int clock;
103 unsigned long flags;
104 #define DW_MMC_CARD_PRESENT 0
105 #define DW_MMC_CARD_NEED_INIT 1
106 int id;
107 int last_detect_state;
108 };
109
110 #if defined(CONFIG_DEBUG_FS)
111 static int dw_mci_req_show(struct seq_file *s, void *v)
112 {
113 struct dw_mci_slot *slot = s->private;
114 struct mmc_request *mrq;
115 struct mmc_command *cmd;
116 struct mmc_command *stop;
117 struct mmc_data *data;
118
119 /* Make sure we get a consistent snapshot */
120 spin_lock_bh(&slot->host->lock);
121 mrq = slot->mrq;
122
123 if (mrq) {
124 cmd = mrq->cmd;
125 data = mrq->data;
126 stop = mrq->stop;
127
128 if (cmd)
129 seq_printf(s,
130 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
131 cmd->opcode, cmd->arg, cmd->flags,
132 cmd->resp[0], cmd->resp[1], cmd->resp[2],
133 cmd->resp[2], cmd->error);
134 if (data)
135 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
136 data->bytes_xfered, data->blocks,
137 data->blksz, data->flags, data->error);
138 if (stop)
139 seq_printf(s,
140 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
141 stop->opcode, stop->arg, stop->flags,
142 stop->resp[0], stop->resp[1], stop->resp[2],
143 stop->resp[2], stop->error);
144 }
145
146 spin_unlock_bh(&slot->host->lock);
147
148 return 0;
149 }
150
151 static int dw_mci_req_open(struct inode *inode, struct file *file)
152 {
153 return single_open(file, dw_mci_req_show, inode->i_private);
154 }
155
156 static const struct file_operations dw_mci_req_fops = {
157 .owner = THIS_MODULE,
158 .open = dw_mci_req_open,
159 .read = seq_read,
160 .llseek = seq_lseek,
161 .release = single_release,
162 };
163
164 static int dw_mci_regs_show(struct seq_file *s, void *v)
165 {
166 seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
167 seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
168 seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
169 seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
170 seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
171 seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
172
173 return 0;
174 }
175
176 static int dw_mci_regs_open(struct inode *inode, struct file *file)
177 {
178 return single_open(file, dw_mci_regs_show, inode->i_private);
179 }
180
181 static const struct file_operations dw_mci_regs_fops = {
182 .owner = THIS_MODULE,
183 .open = dw_mci_regs_open,
184 .read = seq_read,
185 .llseek = seq_lseek,
186 .release = single_release,
187 };
188
189 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
190 {
191 struct mmc_host *mmc = slot->mmc;
192 struct dw_mci *host = slot->host;
193 struct dentry *root;
194 struct dentry *node;
195
196 root = mmc->debugfs_root;
197 if (!root)
198 return;
199
200 node = debugfs_create_file("regs", S_IRUSR, root, host,
201 &dw_mci_regs_fops);
202 if (!node)
203 goto err;
204
205 node = debugfs_create_file("req", S_IRUSR, root, slot,
206 &dw_mci_req_fops);
207 if (!node)
208 goto err;
209
210 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
211 if (!node)
212 goto err;
213
214 node = debugfs_create_x32("pending_events", S_IRUSR, root,
215 (u32 *)&host->pending_events);
216 if (!node)
217 goto err;
218
219 node = debugfs_create_x32("completed_events", S_IRUSR, root,
220 (u32 *)&host->completed_events);
221 if (!node)
222 goto err;
223
224 return;
225
226 err:
227 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
228 }
229 #endif /* defined(CONFIG_DEBUG_FS) */
230
231 static void dw_mci_set_timeout(struct dw_mci *host)
232 {
233 /* timeout (maximum) */
234 mci_writel(host, TMOUT, 0xffffffff);
235 }
236
237 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
238 {
239 struct mmc_data *data;
240 struct dw_mci_slot *slot = mmc_priv(mmc);
241 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
242 u32 cmdr;
243 cmd->error = -EINPROGRESS;
244
245 cmdr = cmd->opcode;
246
247 if (cmdr == MMC_STOP_TRANSMISSION)
248 cmdr |= SDMMC_CMD_STOP;
249 else
250 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
251
252 if (cmd->flags & MMC_RSP_PRESENT) {
253 /* We expect a response, so set this bit */
254 cmdr |= SDMMC_CMD_RESP_EXP;
255 if (cmd->flags & MMC_RSP_136)
256 cmdr |= SDMMC_CMD_RESP_LONG;
257 }
258
259 if (cmd->flags & MMC_RSP_CRC)
260 cmdr |= SDMMC_CMD_RESP_CRC;
261
262 data = cmd->data;
263 if (data) {
264 cmdr |= SDMMC_CMD_DAT_EXP;
265 if (data->flags & MMC_DATA_STREAM)
266 cmdr |= SDMMC_CMD_STRM_MODE;
267 if (data->flags & MMC_DATA_WRITE)
268 cmdr |= SDMMC_CMD_DAT_WR;
269 }
270
271 if (drv_data && drv_data->prepare_command)
272 drv_data->prepare_command(slot->host, &cmdr);
273
274 return cmdr;
275 }
276
277 static void dw_mci_start_command(struct dw_mci *host,
278 struct mmc_command *cmd, u32 cmd_flags)
279 {
280 host->cmd = cmd;
281 dev_vdbg(host->dev,
282 "start command: ARGR=0x%08x CMDR=0x%08x\n",
283 cmd->arg, cmd_flags);
284
285 mci_writel(host, CMDARG, cmd->arg);
286 wmb();
287
288 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
289 }
290
291 static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
292 {
293 dw_mci_start_command(host, data->stop, host->stop_cmdr);
294 }
295
296 /* DMA interface functions */
297 static void dw_mci_stop_dma(struct dw_mci *host)
298 {
299 if (host->using_dma) {
300 host->dma_ops->stop(host);
301 host->dma_ops->cleanup(host);
302 } else {
303 /* Data transfer was stopped by the interrupt handler */
304 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
305 }
306 }
307
308 static int dw_mci_get_dma_dir(struct mmc_data *data)
309 {
310 if (data->flags & MMC_DATA_WRITE)
311 return DMA_TO_DEVICE;
312 else
313 return DMA_FROM_DEVICE;
314 }
315
316 #ifdef CONFIG_MMC_DW_IDMAC
317 static void dw_mci_dma_cleanup(struct dw_mci *host)
318 {
319 struct mmc_data *data = host->data;
320
321 if (data)
322 if (!data->host_cookie)
323 dma_unmap_sg(host->dev,
324 data->sg,
325 data->sg_len,
326 dw_mci_get_dma_dir(data));
327 }
328
329 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
330 {
331 u32 temp;
332
333 /* Disable and reset the IDMAC interface */
334 temp = mci_readl(host, CTRL);
335 temp &= ~SDMMC_CTRL_USE_IDMAC;
336 temp |= SDMMC_CTRL_DMA_RESET;
337 mci_writel(host, CTRL, temp);
338
339 /* Stop the IDMAC running */
340 temp = mci_readl(host, BMOD);
341 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
342 mci_writel(host, BMOD, temp);
343 }
344
345 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
346 {
347 struct mmc_data *data = host->data;
348
349 dev_vdbg(host->dev, "DMA complete\n");
350
351 host->dma_ops->cleanup(host);
352
353 /*
354 * If the card was removed, data will be NULL. No point in trying to
355 * send the stop command or waiting for NBUSY in this case.
356 */
357 if (data) {
358 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
359 tasklet_schedule(&host->tasklet);
360 }
361 }
362
363 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
364 unsigned int sg_len)
365 {
366 int i;
367 struct idmac_desc *desc = host->sg_cpu;
368
369 for (i = 0; i < sg_len; i++, desc++) {
370 unsigned int length = sg_dma_len(&data->sg[i]);
371 u32 mem_addr = sg_dma_address(&data->sg[i]);
372
373 /* Set the OWN bit and disable interrupts for this descriptor */
374 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
375
376 /* Buffer length */
377 IDMAC_SET_BUFFER1_SIZE(desc, length);
378
379 /* Physical address to DMA to/from */
380 desc->des2 = mem_addr;
381 }
382
383 /* Set first descriptor */
384 desc = host->sg_cpu;
385 desc->des0 |= IDMAC_DES0_FD;
386
387 /* Set last descriptor */
388 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
389 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
390 desc->des0 |= IDMAC_DES0_LD;
391
392 wmb();
393 }
394
395 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
396 {
397 u32 temp;
398
399 dw_mci_translate_sglist(host, host->data, sg_len);
400
401 /* Select IDMAC interface */
402 temp = mci_readl(host, CTRL);
403 temp |= SDMMC_CTRL_USE_IDMAC;
404 mci_writel(host, CTRL, temp);
405
406 wmb();
407
408 /* Enable the IDMAC */
409 temp = mci_readl(host, BMOD);
410 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
411 mci_writel(host, BMOD, temp);
412
413 /* Start it running */
414 mci_writel(host, PLDMND, 1);
415 }
416
417 static int dw_mci_idmac_init(struct dw_mci *host)
418 {
419 struct idmac_desc *p;
420 int i;
421
422 /* Number of descriptors in the ring buffer */
423 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
424
425 /* Forward link the descriptor list */
426 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
427 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
428
429 /* Set the last descriptor as the end-of-ring descriptor */
430 p->des3 = host->sg_dma;
431 p->des0 = IDMAC_DES0_ER;
432
433 mci_writel(host, BMOD, SDMMC_IDMAC_SWRESET);
434
435 /* Mask out interrupts - get Tx & Rx complete only */
436 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
437 SDMMC_IDMAC_INT_TI);
438
439 /* Set the descriptor base address */
440 mci_writel(host, DBADDR, host->sg_dma);
441 return 0;
442 }
443
444 static const struct dw_mci_dma_ops dw_mci_idmac_ops = {
445 .init = dw_mci_idmac_init,
446 .start = dw_mci_idmac_start_dma,
447 .stop = dw_mci_idmac_stop_dma,
448 .complete = dw_mci_idmac_complete_dma,
449 .cleanup = dw_mci_dma_cleanup,
450 };
451 #endif /* CONFIG_MMC_DW_IDMAC */
452
453 static int dw_mci_pre_dma_transfer(struct dw_mci *host,
454 struct mmc_data *data,
455 bool next)
456 {
457 struct scatterlist *sg;
458 unsigned int i, sg_len;
459
460 if (!next && data->host_cookie)
461 return data->host_cookie;
462
463 /*
464 * We don't do DMA on "complex" transfers, i.e. with
465 * non-word-aligned buffers or lengths. Also, we don't bother
466 * with all the DMA setup overhead for short transfers.
467 */
468 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
469 return -EINVAL;
470
471 if (data->blksz & 3)
472 return -EINVAL;
473
474 for_each_sg(data->sg, sg, data->sg_len, i) {
475 if (sg->offset & 3 || sg->length & 3)
476 return -EINVAL;
477 }
478
479 sg_len = dma_map_sg(host->dev,
480 data->sg,
481 data->sg_len,
482 dw_mci_get_dma_dir(data));
483 if (sg_len == 0)
484 return -EINVAL;
485
486 if (next)
487 data->host_cookie = sg_len;
488
489 return sg_len;
490 }
491
492 static void dw_mci_pre_req(struct mmc_host *mmc,
493 struct mmc_request *mrq,
494 bool is_first_req)
495 {
496 struct dw_mci_slot *slot = mmc_priv(mmc);
497 struct mmc_data *data = mrq->data;
498
499 if (!slot->host->use_dma || !data)
500 return;
501
502 if (data->host_cookie) {
503 data->host_cookie = 0;
504 return;
505 }
506
507 if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 1) < 0)
508 data->host_cookie = 0;
509 }
510
511 static void dw_mci_post_req(struct mmc_host *mmc,
512 struct mmc_request *mrq,
513 int err)
514 {
515 struct dw_mci_slot *slot = mmc_priv(mmc);
516 struct mmc_data *data = mrq->data;
517
518 if (!slot->host->use_dma || !data)
519 return;
520
521 if (data->host_cookie)
522 dma_unmap_sg(slot->host->dev,
523 data->sg,
524 data->sg_len,
525 dw_mci_get_dma_dir(data));
526 data->host_cookie = 0;
527 }
528
529 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
530 {
531 int sg_len;
532 u32 temp;
533
534 host->using_dma = 0;
535
536 /* If we don't have a channel, we can't do DMA */
537 if (!host->use_dma)
538 return -ENODEV;
539
540 sg_len = dw_mci_pre_dma_transfer(host, data, 0);
541 if (sg_len < 0) {
542 host->dma_ops->stop(host);
543 return sg_len;
544 }
545
546 host->using_dma = 1;
547
548 dev_vdbg(host->dev,
549 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
550 (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
551 sg_len);
552
553 /* Enable the DMA interface */
554 temp = mci_readl(host, CTRL);
555 temp |= SDMMC_CTRL_DMA_ENABLE;
556 mci_writel(host, CTRL, temp);
557
558 /* Disable RX/TX IRQs, let DMA handle it */
559 temp = mci_readl(host, INTMASK);
560 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
561 mci_writel(host, INTMASK, temp);
562
563 host->dma_ops->start(host, sg_len);
564
565 return 0;
566 }
567
568 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
569 {
570 u32 temp;
571
572 data->error = -EINPROGRESS;
573
574 WARN_ON(host->data);
575 host->sg = NULL;
576 host->data = data;
577
578 if (data->flags & MMC_DATA_READ)
579 host->dir_status = DW_MCI_RECV_STATUS;
580 else
581 host->dir_status = DW_MCI_SEND_STATUS;
582
583 if (dw_mci_submit_data_dma(host, data)) {
584 int flags = SG_MITER_ATOMIC;
585 if (host->data->flags & MMC_DATA_READ)
586 flags |= SG_MITER_TO_SG;
587 else
588 flags |= SG_MITER_FROM_SG;
589
590 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
591 host->sg = data->sg;
592 host->part_buf_start = 0;
593 host->part_buf_count = 0;
594
595 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
596 temp = mci_readl(host, INTMASK);
597 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
598 mci_writel(host, INTMASK, temp);
599
600 temp = mci_readl(host, CTRL);
601 temp &= ~SDMMC_CTRL_DMA_ENABLE;
602 mci_writel(host, CTRL, temp);
603 }
604 }
605
606 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
607 {
608 struct dw_mci *host = slot->host;
609 unsigned long timeout = jiffies + msecs_to_jiffies(500);
610 unsigned int cmd_status = 0;
611
612 mci_writel(host, CMDARG, arg);
613 wmb();
614 mci_writel(host, CMD, SDMMC_CMD_START | cmd);
615
616 while (time_before(jiffies, timeout)) {
617 cmd_status = mci_readl(host, CMD);
618 if (!(cmd_status & SDMMC_CMD_START))
619 return;
620 }
621 dev_err(&slot->mmc->class_dev,
622 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
623 cmd, arg, cmd_status);
624 }
625
626 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
627 {
628 struct dw_mci *host = slot->host;
629 u32 div;
630 u32 clk_en_a;
631
632 if (slot->clock != host->current_speed || force_clkinit) {
633 div = host->bus_hz / slot->clock;
634 if (host->bus_hz % slot->clock && host->bus_hz > slot->clock)
635 /*
636 * move the + 1 after the divide to prevent
637 * over-clocking the card.
638 */
639 div += 1;
640
641 div = (host->bus_hz != slot->clock) ? DIV_ROUND_UP(div, 2) : 0;
642
643 dev_info(&slot->mmc->class_dev,
644 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
645 " div = %d)\n", slot->id, host->bus_hz, slot->clock,
646 div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
647
648 /* disable clock */
649 mci_writel(host, CLKENA, 0);
650 mci_writel(host, CLKSRC, 0);
651
652 /* inform CIU */
653 mci_send_cmd(slot,
654 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
655
656 /* set clock to desired speed */
657 mci_writel(host, CLKDIV, div);
658
659 /* inform CIU */
660 mci_send_cmd(slot,
661 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
662
663 /* enable clock; only low power if no SDIO */
664 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
665 if (!(mci_readl(host, INTMASK) & SDMMC_INT_SDIO(slot->id)))
666 clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
667 mci_writel(host, CLKENA, clk_en_a);
668
669 /* inform CIU */
670 mci_send_cmd(slot,
671 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
672
673 host->current_speed = slot->clock;
674 }
675
676 /* Set the current slot bus width */
677 mci_writel(host, CTYPE, (slot->ctype << slot->id));
678 }
679
680 static void __dw_mci_start_request(struct dw_mci *host,
681 struct dw_mci_slot *slot,
682 struct mmc_command *cmd)
683 {
684 struct mmc_request *mrq;
685 struct mmc_data *data;
686 u32 cmdflags;
687
688 mrq = slot->mrq;
689 if (host->pdata->select_slot)
690 host->pdata->select_slot(slot->id);
691
692 host->cur_slot = slot;
693 host->mrq = mrq;
694
695 host->pending_events = 0;
696 host->completed_events = 0;
697 host->data_status = 0;
698
699 data = cmd->data;
700 if (data) {
701 dw_mci_set_timeout(host);
702 mci_writel(host, BYTCNT, data->blksz*data->blocks);
703 mci_writel(host, BLKSIZ, data->blksz);
704 }
705
706 cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
707
708 /* this is the first command, send the initialization clock */
709 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
710 cmdflags |= SDMMC_CMD_INIT;
711
712 if (data) {
713 dw_mci_submit_data(host, data);
714 wmb();
715 }
716
717 dw_mci_start_command(host, cmd, cmdflags);
718
719 if (mrq->stop)
720 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
721 }
722
723 static void dw_mci_start_request(struct dw_mci *host,
724 struct dw_mci_slot *slot)
725 {
726 struct mmc_request *mrq = slot->mrq;
727 struct mmc_command *cmd;
728
729 cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
730 __dw_mci_start_request(host, slot, cmd);
731 }
732
733 /* must be called with host->lock held */
734 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
735 struct mmc_request *mrq)
736 {
737 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
738 host->state);
739
740 slot->mrq = mrq;
741
742 if (host->state == STATE_IDLE) {
743 host->state = STATE_SENDING_CMD;
744 dw_mci_start_request(host, slot);
745 } else {
746 list_add_tail(&slot->queue_node, &host->queue);
747 }
748 }
749
750 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
751 {
752 struct dw_mci_slot *slot = mmc_priv(mmc);
753 struct dw_mci *host = slot->host;
754
755 WARN_ON(slot->mrq);
756
757 /*
758 * The check for card presence and queueing of the request must be
759 * atomic, otherwise the card could be removed in between and the
760 * request wouldn't fail until another card was inserted.
761 */
762 spin_lock_bh(&host->lock);
763
764 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
765 spin_unlock_bh(&host->lock);
766 mrq->cmd->error = -ENOMEDIUM;
767 mmc_request_done(mmc, mrq);
768 return;
769 }
770
771 dw_mci_queue_request(host, slot, mrq);
772
773 spin_unlock_bh(&host->lock);
774 }
775
776 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
777 {
778 struct dw_mci_slot *slot = mmc_priv(mmc);
779 const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
780 u32 regs;
781
782 switch (ios->bus_width) {
783 case MMC_BUS_WIDTH_4:
784 slot->ctype = SDMMC_CTYPE_4BIT;
785 break;
786 case MMC_BUS_WIDTH_8:
787 slot->ctype = SDMMC_CTYPE_8BIT;
788 break;
789 default:
790 /* set default 1 bit mode */
791 slot->ctype = SDMMC_CTYPE_1BIT;
792 }
793
794 regs = mci_readl(slot->host, UHS_REG);
795
796 /* DDR mode set */
797 if (ios->timing == MMC_TIMING_UHS_DDR50)
798 regs |= (0x1 << slot->id) << 16;
799 else
800 regs &= ~(0x1 << slot->id) << 16;
801
802 mci_writel(slot->host, UHS_REG, regs);
803
804 if (ios->clock) {
805 /*
806 * Use mirror of ios->clock to prevent race with mmc
807 * core ios update when finding the minimum.
808 */
809 slot->clock = ios->clock;
810 }
811
812 if (drv_data && drv_data->set_ios)
813 drv_data->set_ios(slot->host, ios);
814
815 /* Slot specific timing and width adjustment */
816 dw_mci_setup_bus(slot, false);
817
818 switch (ios->power_mode) {
819 case MMC_POWER_UP:
820 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
821 break;
822 default:
823 break;
824 }
825 }
826
827 static int dw_mci_get_ro(struct mmc_host *mmc)
828 {
829 int read_only;
830 struct dw_mci_slot *slot = mmc_priv(mmc);
831 struct dw_mci_board *brd = slot->host->pdata;
832
833 /* Use platform get_ro function, else try on board write protect */
834 if (slot->quirks & DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT)
835 read_only = 0;
836 else if (brd->get_ro)
837 read_only = brd->get_ro(slot->id);
838 else if (gpio_is_valid(slot->wp_gpio))
839 read_only = gpio_get_value(slot->wp_gpio);
840 else
841 read_only =
842 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
843
844 dev_dbg(&mmc->class_dev, "card is %s\n",
845 read_only ? "read-only" : "read-write");
846
847 return read_only;
848 }
849
850 static int dw_mci_get_cd(struct mmc_host *mmc)
851 {
852 int present;
853 struct dw_mci_slot *slot = mmc_priv(mmc);
854 struct dw_mci_board *brd = slot->host->pdata;
855
856 /* Use platform get_cd function, else try onboard card detect */
857 if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
858 present = 1;
859 else if (brd->get_cd)
860 present = !brd->get_cd(slot->id);
861 else
862 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
863 == 0 ? 1 : 0;
864
865 if (present)
866 dev_dbg(&mmc->class_dev, "card is present\n");
867 else
868 dev_dbg(&mmc->class_dev, "card is not present\n");
869
870 return present;
871 }
872
873 /*
874 * Disable lower power mode.
875 *
876 * Low power mode will stop the card clock when idle. According to the
877 * description of the CLKENA register we should disable low power mode
878 * for SDIO cards if we need SDIO interrupts to work.
879 *
880 * This function is fast if low power mode is already disabled.
881 */
882 static void dw_mci_disable_low_power(struct dw_mci_slot *slot)
883 {
884 struct dw_mci *host = slot->host;
885 u32 clk_en_a;
886 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id;
887
888 clk_en_a = mci_readl(host, CLKENA);
889
890 if (clk_en_a & clken_low_pwr) {
891 mci_writel(host, CLKENA, clk_en_a & ~clken_low_pwr);
892 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK |
893 SDMMC_CMD_PRV_DAT_WAIT, 0);
894 }
895 }
896
897 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
898 {
899 struct dw_mci_slot *slot = mmc_priv(mmc);
900 struct dw_mci *host = slot->host;
901 u32 int_mask;
902
903 /* Enable/disable Slot Specific SDIO interrupt */
904 int_mask = mci_readl(host, INTMASK);
905 if (enb) {
906 /*
907 * Turn off low power mode if it was enabled. This is a bit of
908 * a heavy operation and we disable / enable IRQs a lot, so
909 * we'll leave low power mode disabled and it will get
910 * re-enabled again in dw_mci_setup_bus().
911 */
912 dw_mci_disable_low_power(slot);
913
914 mci_writel(host, INTMASK,
915 (int_mask | SDMMC_INT_SDIO(slot->id)));
916 } else {
917 mci_writel(host, INTMASK,
918 (int_mask & ~SDMMC_INT_SDIO(slot->id)));
919 }
920 }
921
922 static const struct mmc_host_ops dw_mci_ops = {
923 .request = dw_mci_request,
924 .pre_req = dw_mci_pre_req,
925 .post_req = dw_mci_post_req,
926 .set_ios = dw_mci_set_ios,
927 .get_ro = dw_mci_get_ro,
928 .get_cd = dw_mci_get_cd,
929 .enable_sdio_irq = dw_mci_enable_sdio_irq,
930 };
931
932 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
933 __releases(&host->lock)
934 __acquires(&host->lock)
935 {
936 struct dw_mci_slot *slot;
937 struct mmc_host *prev_mmc = host->cur_slot->mmc;
938
939 WARN_ON(host->cmd || host->data);
940
941 host->cur_slot->mrq = NULL;
942 host->mrq = NULL;
943 if (!list_empty(&host->queue)) {
944 slot = list_entry(host->queue.next,
945 struct dw_mci_slot, queue_node);
946 list_del(&slot->queue_node);
947 dev_vdbg(host->dev, "list not empty: %s is next\n",
948 mmc_hostname(slot->mmc));
949 host->state = STATE_SENDING_CMD;
950 dw_mci_start_request(host, slot);
951 } else {
952 dev_vdbg(host->dev, "list empty\n");
953 host->state = STATE_IDLE;
954 }
955
956 spin_unlock(&host->lock);
957 mmc_request_done(prev_mmc, mrq);
958 spin_lock(&host->lock);
959 }
960
961 static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
962 {
963 u32 status = host->cmd_status;
964
965 host->cmd_status = 0;
966
967 /* Read the response from the card (up to 16 bytes) */
968 if (cmd->flags & MMC_RSP_PRESENT) {
969 if (cmd->flags & MMC_RSP_136) {
970 cmd->resp[3] = mci_readl(host, RESP0);
971 cmd->resp[2] = mci_readl(host, RESP1);
972 cmd->resp[1] = mci_readl(host, RESP2);
973 cmd->resp[0] = mci_readl(host, RESP3);
974 } else {
975 cmd->resp[0] = mci_readl(host, RESP0);
976 cmd->resp[1] = 0;
977 cmd->resp[2] = 0;
978 cmd->resp[3] = 0;
979 }
980 }
981
982 if (status & SDMMC_INT_RTO)
983 cmd->error = -ETIMEDOUT;
984 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
985 cmd->error = -EILSEQ;
986 else if (status & SDMMC_INT_RESP_ERR)
987 cmd->error = -EIO;
988 else
989 cmd->error = 0;
990
991 if (cmd->error) {
992 /* newer ip versions need a delay between retries */
993 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
994 mdelay(20);
995
996 if (cmd->data) {
997 dw_mci_stop_dma(host);
998 host->data = NULL;
999 }
1000 }
1001 }
1002
1003 static void dw_mci_tasklet_func(unsigned long priv)
1004 {
1005 struct dw_mci *host = (struct dw_mci *)priv;
1006 struct mmc_data *data;
1007 struct mmc_command *cmd;
1008 enum dw_mci_state state;
1009 enum dw_mci_state prev_state;
1010 u32 status, ctrl;
1011
1012 spin_lock(&host->lock);
1013
1014 state = host->state;
1015 data = host->data;
1016
1017 do {
1018 prev_state = state;
1019
1020 switch (state) {
1021 case STATE_IDLE:
1022 break;
1023
1024 case STATE_SENDING_CMD:
1025 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1026 &host->pending_events))
1027 break;
1028
1029 cmd = host->cmd;
1030 host->cmd = NULL;
1031 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
1032 dw_mci_command_complete(host, cmd);
1033 if (cmd == host->mrq->sbc && !cmd->error) {
1034 prev_state = state = STATE_SENDING_CMD;
1035 __dw_mci_start_request(host, host->cur_slot,
1036 host->mrq->cmd);
1037 goto unlock;
1038 }
1039
1040 if (!host->mrq->data || cmd->error) {
1041 dw_mci_request_end(host, host->mrq);
1042 goto unlock;
1043 }
1044
1045 prev_state = state = STATE_SENDING_DATA;
1046 /* fall through */
1047
1048 case STATE_SENDING_DATA:
1049 if (test_and_clear_bit(EVENT_DATA_ERROR,
1050 &host->pending_events)) {
1051 dw_mci_stop_dma(host);
1052 if (data->stop)
1053 send_stop_cmd(host, data);
1054 state = STATE_DATA_ERROR;
1055 break;
1056 }
1057
1058 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1059 &host->pending_events))
1060 break;
1061
1062 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
1063 prev_state = state = STATE_DATA_BUSY;
1064 /* fall through */
1065
1066 case STATE_DATA_BUSY:
1067 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
1068 &host->pending_events))
1069 break;
1070
1071 host->data = NULL;
1072 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
1073 status = host->data_status;
1074
1075 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1076 if (status & SDMMC_INT_DTO) {
1077 data->error = -ETIMEDOUT;
1078 } else if (status & SDMMC_INT_DCRC) {
1079 data->error = -EILSEQ;
1080 } else if (status & SDMMC_INT_EBE &&
1081 host->dir_status ==
1082 DW_MCI_SEND_STATUS) {
1083 /*
1084 * No data CRC status was returned.
1085 * The number of bytes transferred will
1086 * be exaggerated in PIO mode.
1087 */
1088 data->bytes_xfered = 0;
1089 data->error = -ETIMEDOUT;
1090 } else {
1091 dev_err(host->dev,
1092 "data FIFO error "
1093 "(status=%08x)\n",
1094 status);
1095 data->error = -EIO;
1096 }
1097 /*
1098 * After an error, there may be data lingering
1099 * in the FIFO, so reset it - doing so
1100 * generates a block interrupt, hence setting
1101 * the scatter-gather pointer to NULL.
1102 */
1103 sg_miter_stop(&host->sg_miter);
1104 host->sg = NULL;
1105 ctrl = mci_readl(host, CTRL);
1106 ctrl |= SDMMC_CTRL_FIFO_RESET;
1107 mci_writel(host, CTRL, ctrl);
1108 } else {
1109 data->bytes_xfered = data->blocks * data->blksz;
1110 data->error = 0;
1111 }
1112
1113 if (!data->stop) {
1114 dw_mci_request_end(host, host->mrq);
1115 goto unlock;
1116 }
1117
1118 if (host->mrq->sbc && !data->error) {
1119 data->stop->error = 0;
1120 dw_mci_request_end(host, host->mrq);
1121 goto unlock;
1122 }
1123
1124 prev_state = state = STATE_SENDING_STOP;
1125 if (!data->error)
1126 send_stop_cmd(host, data);
1127 /* fall through */
1128
1129 case STATE_SENDING_STOP:
1130 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
1131 &host->pending_events))
1132 break;
1133
1134 host->cmd = NULL;
1135 dw_mci_command_complete(host, host->mrq->stop);
1136 dw_mci_request_end(host, host->mrq);
1137 goto unlock;
1138
1139 case STATE_DATA_ERROR:
1140 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
1141 &host->pending_events))
1142 break;
1143
1144 state = STATE_DATA_BUSY;
1145 break;
1146 }
1147 } while (state != prev_state);
1148
1149 host->state = state;
1150 unlock:
1151 spin_unlock(&host->lock);
1152
1153 }
1154
1155 /* push final bytes to part_buf, only use during push */
1156 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
1157 {
1158 memcpy((void *)&host->part_buf, buf, cnt);
1159 host->part_buf_count = cnt;
1160 }
1161
1162 /* append bytes to part_buf, only use during push */
1163 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
1164 {
1165 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
1166 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
1167 host->part_buf_count += cnt;
1168 return cnt;
1169 }
1170
1171 /* pull first bytes from part_buf, only use during pull */
1172 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1173 {
1174 cnt = min(cnt, (int)host->part_buf_count);
1175 if (cnt) {
1176 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1177 cnt);
1178 host->part_buf_count -= cnt;
1179 host->part_buf_start += cnt;
1180 }
1181 return cnt;
1182 }
1183
1184 /* pull final bytes from the part_buf, assuming it's just been filled */
1185 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1186 {
1187 memcpy(buf, &host->part_buf, cnt);
1188 host->part_buf_start = cnt;
1189 host->part_buf_count = (1 << host->data_shift) - cnt;
1190 }
1191
1192 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1193 {
1194 /* try and push anything in the part_buf */
1195 if (unlikely(host->part_buf_count)) {
1196 int len = dw_mci_push_part_bytes(host, buf, cnt);
1197 buf += len;
1198 cnt -= len;
1199 if (!sg_next(host->sg) || host->part_buf_count == 2) {
1200 mci_writew(host, DATA(host->data_offset),
1201 host->part_buf16);
1202 host->part_buf_count = 0;
1203 }
1204 }
1205 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1206 if (unlikely((unsigned long)buf & 0x1)) {
1207 while (cnt >= 2) {
1208 u16 aligned_buf[64];
1209 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1210 int items = len >> 1;
1211 int i;
1212 /* memcpy from input buffer into aligned buffer */
1213 memcpy(aligned_buf, buf, len);
1214 buf += len;
1215 cnt -= len;
1216 /* push data from aligned buffer into fifo */
1217 for (i = 0; i < items; ++i)
1218 mci_writew(host, DATA(host->data_offset),
1219 aligned_buf[i]);
1220 }
1221 } else
1222 #endif
1223 {
1224 u16 *pdata = buf;
1225 for (; cnt >= 2; cnt -= 2)
1226 mci_writew(host, DATA(host->data_offset), *pdata++);
1227 buf = pdata;
1228 }
1229 /* put anything remaining in the part_buf */
1230 if (cnt) {
1231 dw_mci_set_part_bytes(host, buf, cnt);
1232 if (!sg_next(host->sg))
1233 mci_writew(host, DATA(host->data_offset),
1234 host->part_buf16);
1235 }
1236 }
1237
1238 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1239 {
1240 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1241 if (unlikely((unsigned long)buf & 0x1)) {
1242 while (cnt >= 2) {
1243 /* pull data from fifo into aligned buffer */
1244 u16 aligned_buf[64];
1245 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1246 int items = len >> 1;
1247 int i;
1248 for (i = 0; i < items; ++i)
1249 aligned_buf[i] = mci_readw(host,
1250 DATA(host->data_offset));
1251 /* memcpy from aligned buffer into output buffer */
1252 memcpy(buf, aligned_buf, len);
1253 buf += len;
1254 cnt -= len;
1255 }
1256 } else
1257 #endif
1258 {
1259 u16 *pdata = buf;
1260 for (; cnt >= 2; cnt -= 2)
1261 *pdata++ = mci_readw(host, DATA(host->data_offset));
1262 buf = pdata;
1263 }
1264 if (cnt) {
1265 host->part_buf16 = mci_readw(host, DATA(host->data_offset));
1266 dw_mci_pull_final_bytes(host, buf, cnt);
1267 }
1268 }
1269
1270 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1271 {
1272 /* try and push anything in the part_buf */
1273 if (unlikely(host->part_buf_count)) {
1274 int len = dw_mci_push_part_bytes(host, buf, cnt);
1275 buf += len;
1276 cnt -= len;
1277 if (!sg_next(host->sg) || host->part_buf_count == 4) {
1278 mci_writel(host, DATA(host->data_offset),
1279 host->part_buf32);
1280 host->part_buf_count = 0;
1281 }
1282 }
1283 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1284 if (unlikely((unsigned long)buf & 0x3)) {
1285 while (cnt >= 4) {
1286 u32 aligned_buf[32];
1287 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1288 int items = len >> 2;
1289 int i;
1290 /* memcpy from input buffer into aligned buffer */
1291 memcpy(aligned_buf, buf, len);
1292 buf += len;
1293 cnt -= len;
1294 /* push data from aligned buffer into fifo */
1295 for (i = 0; i < items; ++i)
1296 mci_writel(host, DATA(host->data_offset),
1297 aligned_buf[i]);
1298 }
1299 } else
1300 #endif
1301 {
1302 u32 *pdata = buf;
1303 for (; cnt >= 4; cnt -= 4)
1304 mci_writel(host, DATA(host->data_offset), *pdata++);
1305 buf = pdata;
1306 }
1307 /* put anything remaining in the part_buf */
1308 if (cnt) {
1309 dw_mci_set_part_bytes(host, buf, cnt);
1310 if (!sg_next(host->sg))
1311 mci_writel(host, DATA(host->data_offset),
1312 host->part_buf32);
1313 }
1314 }
1315
1316 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1317 {
1318 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1319 if (unlikely((unsigned long)buf & 0x3)) {
1320 while (cnt >= 4) {
1321 /* pull data from fifo into aligned buffer */
1322 u32 aligned_buf[32];
1323 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1324 int items = len >> 2;
1325 int i;
1326 for (i = 0; i < items; ++i)
1327 aligned_buf[i] = mci_readl(host,
1328 DATA(host->data_offset));
1329 /* memcpy from aligned buffer into output buffer */
1330 memcpy(buf, aligned_buf, len);
1331 buf += len;
1332 cnt -= len;
1333 }
1334 } else
1335 #endif
1336 {
1337 u32 *pdata = buf;
1338 for (; cnt >= 4; cnt -= 4)
1339 *pdata++ = mci_readl(host, DATA(host->data_offset));
1340 buf = pdata;
1341 }
1342 if (cnt) {
1343 host->part_buf32 = mci_readl(host, DATA(host->data_offset));
1344 dw_mci_pull_final_bytes(host, buf, cnt);
1345 }
1346 }
1347
1348 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1349 {
1350 /* try and push anything in the part_buf */
1351 if (unlikely(host->part_buf_count)) {
1352 int len = dw_mci_push_part_bytes(host, buf, cnt);
1353 buf += len;
1354 cnt -= len;
1355 if (!sg_next(host->sg) || host->part_buf_count == 8) {
1356 mci_writew(host, DATA(host->data_offset),
1357 host->part_buf);
1358 host->part_buf_count = 0;
1359 }
1360 }
1361 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1362 if (unlikely((unsigned long)buf & 0x7)) {
1363 while (cnt >= 8) {
1364 u64 aligned_buf[16];
1365 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1366 int items = len >> 3;
1367 int i;
1368 /* memcpy from input buffer into aligned buffer */
1369 memcpy(aligned_buf, buf, len);
1370 buf += len;
1371 cnt -= len;
1372 /* push data from aligned buffer into fifo */
1373 for (i = 0; i < items; ++i)
1374 mci_writeq(host, DATA(host->data_offset),
1375 aligned_buf[i]);
1376 }
1377 } else
1378 #endif
1379 {
1380 u64 *pdata = buf;
1381 for (; cnt >= 8; cnt -= 8)
1382 mci_writeq(host, DATA(host->data_offset), *pdata++);
1383 buf = pdata;
1384 }
1385 /* put anything remaining in the part_buf */
1386 if (cnt) {
1387 dw_mci_set_part_bytes(host, buf, cnt);
1388 if (!sg_next(host->sg))
1389 mci_writeq(host, DATA(host->data_offset),
1390 host->part_buf);
1391 }
1392 }
1393
1394 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1395 {
1396 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1397 if (unlikely((unsigned long)buf & 0x7)) {
1398 while (cnt >= 8) {
1399 /* pull data from fifo into aligned buffer */
1400 u64 aligned_buf[16];
1401 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1402 int items = len >> 3;
1403 int i;
1404 for (i = 0; i < items; ++i)
1405 aligned_buf[i] = mci_readq(host,
1406 DATA(host->data_offset));
1407 /* memcpy from aligned buffer into output buffer */
1408 memcpy(buf, aligned_buf, len);
1409 buf += len;
1410 cnt -= len;
1411 }
1412 } else
1413 #endif
1414 {
1415 u64 *pdata = buf;
1416 for (; cnt >= 8; cnt -= 8)
1417 *pdata++ = mci_readq(host, DATA(host->data_offset));
1418 buf = pdata;
1419 }
1420 if (cnt) {
1421 host->part_buf = mci_readq(host, DATA(host->data_offset));
1422 dw_mci_pull_final_bytes(host, buf, cnt);
1423 }
1424 }
1425
1426 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1427 {
1428 int len;
1429
1430 /* get remaining partial bytes */
1431 len = dw_mci_pull_part_bytes(host, buf, cnt);
1432 if (unlikely(len == cnt))
1433 return;
1434 buf += len;
1435 cnt -= len;
1436
1437 /* get the rest of the data */
1438 host->pull_data(host, buf, cnt);
1439 }
1440
1441 static void dw_mci_read_data_pio(struct dw_mci *host)
1442 {
1443 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1444 void *buf;
1445 unsigned int offset;
1446 struct mmc_data *data = host->data;
1447 int shift = host->data_shift;
1448 u32 status;
1449 unsigned int nbytes = 0, len;
1450 unsigned int remain, fcnt;
1451
1452 do {
1453 if (!sg_miter_next(sg_miter))
1454 goto done;
1455
1456 host->sg = sg_miter->__sg;
1457 buf = sg_miter->addr;
1458 remain = sg_miter->length;
1459 offset = 0;
1460
1461 do {
1462 fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS))
1463 << shift) + host->part_buf_count;
1464 len = min(remain, fcnt);
1465 if (!len)
1466 break;
1467 dw_mci_pull_data(host, (void *)(buf + offset), len);
1468 offset += len;
1469 nbytes += len;
1470 remain -= len;
1471 } while (remain);
1472
1473 sg_miter->consumed = offset;
1474 status = mci_readl(host, MINTSTS);
1475 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1476 } while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
1477 data->bytes_xfered += nbytes;
1478
1479 if (!remain) {
1480 if (!sg_miter_next(sg_miter))
1481 goto done;
1482 sg_miter->consumed = 0;
1483 }
1484 sg_miter_stop(sg_miter);
1485 return;
1486
1487 done:
1488 data->bytes_xfered += nbytes;
1489 sg_miter_stop(sg_miter);
1490 host->sg = NULL;
1491 smp_wmb();
1492 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1493 }
1494
1495 static void dw_mci_write_data_pio(struct dw_mci *host)
1496 {
1497 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1498 void *buf;
1499 unsigned int offset;
1500 struct mmc_data *data = host->data;
1501 int shift = host->data_shift;
1502 u32 status;
1503 unsigned int nbytes = 0, len;
1504 unsigned int fifo_depth = host->fifo_depth;
1505 unsigned int remain, fcnt;
1506
1507 do {
1508 if (!sg_miter_next(sg_miter))
1509 goto done;
1510
1511 host->sg = sg_miter->__sg;
1512 buf = sg_miter->addr;
1513 remain = sg_miter->length;
1514 offset = 0;
1515
1516 do {
1517 fcnt = ((fifo_depth -
1518 SDMMC_GET_FCNT(mci_readl(host, STATUS)))
1519 << shift) - host->part_buf_count;
1520 len = min(remain, fcnt);
1521 if (!len)
1522 break;
1523 host->push_data(host, (void *)(buf + offset), len);
1524 offset += len;
1525 nbytes += len;
1526 remain -= len;
1527 } while (remain);
1528
1529 sg_miter->consumed = offset;
1530 status = mci_readl(host, MINTSTS);
1531 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1532 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1533 data->bytes_xfered += nbytes;
1534
1535 if (!remain) {
1536 if (!sg_miter_next(sg_miter))
1537 goto done;
1538 sg_miter->consumed = 0;
1539 }
1540 sg_miter_stop(sg_miter);
1541 return;
1542
1543 done:
1544 data->bytes_xfered += nbytes;
1545 sg_miter_stop(sg_miter);
1546 host->sg = NULL;
1547 smp_wmb();
1548 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1549 }
1550
1551 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1552 {
1553 if (!host->cmd_status)
1554 host->cmd_status = status;
1555
1556 smp_wmb();
1557
1558 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1559 tasklet_schedule(&host->tasklet);
1560 }
1561
1562 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1563 {
1564 struct dw_mci *host = dev_id;
1565 u32 pending;
1566 unsigned int pass_count = 0;
1567 int i;
1568
1569 do {
1570 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1571
1572 /*
1573 * DTO fix - version 2.10a and below, and only if internal DMA
1574 * is configured.
1575 */
1576 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1577 if (!pending &&
1578 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1579 pending |= SDMMC_INT_DATA_OVER;
1580 }
1581
1582 if (!pending)
1583 break;
1584
1585 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1586 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1587 host->cmd_status = pending;
1588 smp_wmb();
1589 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1590 }
1591
1592 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1593 /* if there is an error report DATA_ERROR */
1594 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1595 host->data_status = pending;
1596 smp_wmb();
1597 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1598 tasklet_schedule(&host->tasklet);
1599 }
1600
1601 if (pending & SDMMC_INT_DATA_OVER) {
1602 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1603 if (!host->data_status)
1604 host->data_status = pending;
1605 smp_wmb();
1606 if (host->dir_status == DW_MCI_RECV_STATUS) {
1607 if (host->sg != NULL)
1608 dw_mci_read_data_pio(host);
1609 }
1610 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1611 tasklet_schedule(&host->tasklet);
1612 }
1613
1614 if (pending & SDMMC_INT_RXDR) {
1615 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1616 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1617 dw_mci_read_data_pio(host);
1618 }
1619
1620 if (pending & SDMMC_INT_TXDR) {
1621 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1622 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1623 dw_mci_write_data_pio(host);
1624 }
1625
1626 if (pending & SDMMC_INT_CMD_DONE) {
1627 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1628 dw_mci_cmd_interrupt(host, pending);
1629 }
1630
1631 if (pending & SDMMC_INT_CD) {
1632 mci_writel(host, RINTSTS, SDMMC_INT_CD);
1633 queue_work(host->card_workqueue, &host->card_work);
1634 }
1635
1636 /* Handle SDIO Interrupts */
1637 for (i = 0; i < host->num_slots; i++) {
1638 struct dw_mci_slot *slot = host->slot[i];
1639 if (pending & SDMMC_INT_SDIO(i)) {
1640 mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
1641 mmc_signal_sdio_irq(slot->mmc);
1642 }
1643 }
1644
1645 } while (pass_count++ < 5);
1646
1647 #ifdef CONFIG_MMC_DW_IDMAC
1648 /* Handle DMA interrupts */
1649 pending = mci_readl(host, IDSTS);
1650 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1651 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1652 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1653 host->dma_ops->complete(host);
1654 }
1655 #endif
1656
1657 return IRQ_HANDLED;
1658 }
1659
1660 static void dw_mci_work_routine_card(struct work_struct *work)
1661 {
1662 struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1663 int i;
1664
1665 for (i = 0; i < host->num_slots; i++) {
1666 struct dw_mci_slot *slot = host->slot[i];
1667 struct mmc_host *mmc = slot->mmc;
1668 struct mmc_request *mrq;
1669 int present;
1670 u32 ctrl;
1671
1672 present = dw_mci_get_cd(mmc);
1673 while (present != slot->last_detect_state) {
1674 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1675 present ? "inserted" : "removed");
1676
1677 /* Power up slot (before spin_lock, may sleep) */
1678 if (present != 0 && host->pdata->setpower)
1679 host->pdata->setpower(slot->id, mmc->ocr_avail);
1680
1681 spin_lock_bh(&host->lock);
1682
1683 /* Card change detected */
1684 slot->last_detect_state = present;
1685
1686 /* Mark card as present if applicable */
1687 if (present != 0)
1688 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1689
1690 /* Clean up queue if present */
1691 mrq = slot->mrq;
1692 if (mrq) {
1693 if (mrq == host->mrq) {
1694 host->data = NULL;
1695 host->cmd = NULL;
1696
1697 switch (host->state) {
1698 case STATE_IDLE:
1699 break;
1700 case STATE_SENDING_CMD:
1701 mrq->cmd->error = -ENOMEDIUM;
1702 if (!mrq->data)
1703 break;
1704 /* fall through */
1705 case STATE_SENDING_DATA:
1706 mrq->data->error = -ENOMEDIUM;
1707 dw_mci_stop_dma(host);
1708 break;
1709 case STATE_DATA_BUSY:
1710 case STATE_DATA_ERROR:
1711 if (mrq->data->error == -EINPROGRESS)
1712 mrq->data->error = -ENOMEDIUM;
1713 if (!mrq->stop)
1714 break;
1715 /* fall through */
1716 case STATE_SENDING_STOP:
1717 mrq->stop->error = -ENOMEDIUM;
1718 break;
1719 }
1720
1721 dw_mci_request_end(host, mrq);
1722 } else {
1723 list_del(&slot->queue_node);
1724 mrq->cmd->error = -ENOMEDIUM;
1725 if (mrq->data)
1726 mrq->data->error = -ENOMEDIUM;
1727 if (mrq->stop)
1728 mrq->stop->error = -ENOMEDIUM;
1729
1730 spin_unlock(&host->lock);
1731 mmc_request_done(slot->mmc, mrq);
1732 spin_lock(&host->lock);
1733 }
1734 }
1735
1736 /* Power down slot */
1737 if (present == 0) {
1738 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1739
1740 /*
1741 * Clear down the FIFO - doing so generates a
1742 * block interrupt, hence setting the
1743 * scatter-gather pointer to NULL.
1744 */
1745 sg_miter_stop(&host->sg_miter);
1746 host->sg = NULL;
1747
1748 ctrl = mci_readl(host, CTRL);
1749 ctrl |= SDMMC_CTRL_FIFO_RESET;
1750 mci_writel(host, CTRL, ctrl);
1751
1752 #ifdef CONFIG_MMC_DW_IDMAC
1753 ctrl = mci_readl(host, BMOD);
1754 /* Software reset of DMA */
1755 ctrl |= SDMMC_IDMAC_SWRESET;
1756 mci_writel(host, BMOD, ctrl);
1757 #endif
1758
1759 }
1760
1761 spin_unlock_bh(&host->lock);
1762
1763 /* Power down slot (after spin_unlock, may sleep) */
1764 if (present == 0 && host->pdata->setpower)
1765 host->pdata->setpower(slot->id, 0);
1766
1767 present = dw_mci_get_cd(mmc);
1768 }
1769
1770 mmc_detect_change(slot->mmc,
1771 msecs_to_jiffies(host->pdata->detect_delay_ms));
1772 }
1773 }
1774
1775 #ifdef CONFIG_OF
1776 /* given a slot id, find out the device node representing that slot */
1777 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
1778 {
1779 struct device_node *np;
1780 const __be32 *addr;
1781 int len;
1782
1783 if (!dev || !dev->of_node)
1784 return NULL;
1785
1786 for_each_child_of_node(dev->of_node, np) {
1787 addr = of_get_property(np, "reg", &len);
1788 if (!addr || (len < sizeof(int)))
1789 continue;
1790 if (be32_to_cpup(addr) == slot)
1791 return np;
1792 }
1793 return NULL;
1794 }
1795
1796 static struct dw_mci_of_slot_quirks {
1797 char *quirk;
1798 int id;
1799 } of_slot_quirks[] = {
1800 {
1801 .quirk = "disable-wp",
1802 .id = DW_MCI_SLOT_QUIRK_NO_WRITE_PROTECT,
1803 },
1804 };
1805
1806 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
1807 {
1808 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
1809 int quirks = 0;
1810 int idx;
1811
1812 /* get quirks */
1813 for (idx = 0; idx < ARRAY_SIZE(of_slot_quirks); idx++)
1814 if (of_get_property(np, of_slot_quirks[idx].quirk, NULL))
1815 quirks |= of_slot_quirks[idx].id;
1816
1817 return quirks;
1818 }
1819
1820 /* find out bus-width for a given slot */
1821 static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
1822 {
1823 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
1824 u32 bus_wd = 1;
1825
1826 if (!np)
1827 return 1;
1828
1829 if (of_property_read_u32(np, "bus-width", &bus_wd))
1830 dev_err(dev, "bus-width property not found, assuming width"
1831 " as 1\n");
1832 return bus_wd;
1833 }
1834
1835 /* find the write protect gpio for a given slot; or -1 if none specified */
1836 static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
1837 {
1838 struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
1839 int gpio;
1840
1841 if (!np)
1842 return -EINVAL;
1843
1844 gpio = of_get_named_gpio(np, "wp-gpios", 0);
1845
1846 /* Having a missing entry is valid; return silently */
1847 if (!gpio_is_valid(gpio))
1848 return -EINVAL;
1849
1850 if (devm_gpio_request(dev, gpio, "dw-mci-wp")) {
1851 dev_warn(dev, "gpio [%d] request failed\n", gpio);
1852 return -EINVAL;
1853 }
1854
1855 return gpio;
1856 }
1857 #else /* CONFIG_OF */
1858 static int dw_mci_of_get_slot_quirks(struct device *dev, u8 slot)
1859 {
1860 return 0;
1861 }
1862 static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
1863 {
1864 return 1;
1865 }
1866 static struct device_node *dw_mci_of_find_slot_node(struct device *dev, u8 slot)
1867 {
1868 return NULL;
1869 }
1870 static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
1871 {
1872 return -EINVAL;
1873 }
1874 #endif /* CONFIG_OF */
1875
1876 static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
1877 {
1878 struct mmc_host *mmc;
1879 struct dw_mci_slot *slot;
1880 const struct dw_mci_drv_data *drv_data = host->drv_data;
1881 int ctrl_id, ret;
1882 u8 bus_width;
1883
1884 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
1885 if (!mmc)
1886 return -ENOMEM;
1887
1888 slot = mmc_priv(mmc);
1889 slot->id = id;
1890 slot->mmc = mmc;
1891 slot->host = host;
1892 host->slot[id] = slot;
1893
1894 slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
1895
1896 mmc->ops = &dw_mci_ops;
1897 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
1898 mmc->f_max = host->bus_hz;
1899
1900 if (host->pdata->get_ocr)
1901 mmc->ocr_avail = host->pdata->get_ocr(id);
1902 else
1903 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1904
1905 /*
1906 * Start with slot power disabled, it will be enabled when a card
1907 * is detected.
1908 */
1909 if (host->pdata->setpower)
1910 host->pdata->setpower(id, 0);
1911
1912 if (host->pdata->caps)
1913 mmc->caps = host->pdata->caps;
1914
1915 if (host->pdata->pm_caps)
1916 mmc->pm_caps = host->pdata->pm_caps;
1917
1918 if (host->dev->of_node) {
1919 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
1920 if (ctrl_id < 0)
1921 ctrl_id = 0;
1922 } else {
1923 ctrl_id = to_platform_device(host->dev)->id;
1924 }
1925 if (drv_data && drv_data->caps)
1926 mmc->caps |= drv_data->caps[ctrl_id];
1927
1928 if (host->pdata->caps2)
1929 mmc->caps2 = host->pdata->caps2;
1930
1931 if (host->pdata->get_bus_wd)
1932 bus_width = host->pdata->get_bus_wd(slot->id);
1933 else if (host->dev->of_node)
1934 bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id);
1935 else
1936 bus_width = 1;
1937
1938 if (drv_data && drv_data->setup_bus) {
1939 struct device_node *slot_np;
1940 slot_np = dw_mci_of_find_slot_node(host->dev, slot->id);
1941 ret = drv_data->setup_bus(host, slot_np, bus_width);
1942 if (ret)
1943 goto err_setup_bus;
1944 }
1945
1946 switch (bus_width) {
1947 case 8:
1948 mmc->caps |= MMC_CAP_8_BIT_DATA;
1949 case 4:
1950 mmc->caps |= MMC_CAP_4_BIT_DATA;
1951 }
1952
1953 if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
1954 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
1955
1956 if (host->pdata->blk_settings) {
1957 mmc->max_segs = host->pdata->blk_settings->max_segs;
1958 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
1959 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
1960 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
1961 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
1962 } else {
1963 /* Useful defaults if platform data is unset. */
1964 #ifdef CONFIG_MMC_DW_IDMAC
1965 mmc->max_segs = host->ring_size;
1966 mmc->max_blk_size = 65536;
1967 mmc->max_blk_count = host->ring_size;
1968 mmc->max_seg_size = 0x1000;
1969 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
1970 #else
1971 mmc->max_segs = 64;
1972 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
1973 mmc->max_blk_count = 512;
1974 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1975 mmc->max_seg_size = mmc->max_req_size;
1976 #endif /* CONFIG_MMC_DW_IDMAC */
1977 }
1978
1979 host->vmmc = devm_regulator_get(mmc_dev(mmc), "vmmc");
1980 if (IS_ERR(host->vmmc)) {
1981 pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
1982 host->vmmc = NULL;
1983 } else
1984 regulator_enable(host->vmmc);
1985
1986 if (dw_mci_get_cd(mmc))
1987 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1988 else
1989 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1990
1991 slot->wp_gpio = dw_mci_of_get_wp_gpio(host->dev, slot->id);
1992
1993 mmc_add_host(mmc);
1994
1995 #if defined(CONFIG_DEBUG_FS)
1996 dw_mci_init_debugfs(slot);
1997 #endif
1998
1999 /* Card initially undetected */
2000 slot->last_detect_state = 0;
2001
2002 /*
2003 * Card may have been plugged in prior to boot so we
2004 * need to run the detect tasklet
2005 */
2006 queue_work(host->card_workqueue, &host->card_work);
2007
2008 return 0;
2009
2010 err_setup_bus:
2011 mmc_free_host(mmc);
2012 return -EINVAL;
2013 }
2014
2015 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
2016 {
2017 /* Shutdown detect IRQ */
2018 if (slot->host->pdata->exit)
2019 slot->host->pdata->exit(id);
2020
2021 /* Debugfs stuff is cleaned up by mmc core */
2022 mmc_remove_host(slot->mmc);
2023 slot->host->slot[id] = NULL;
2024 mmc_free_host(slot->mmc);
2025 }
2026
2027 static void dw_mci_init_dma(struct dw_mci *host)
2028 {
2029 /* Alloc memory for sg translation */
2030 host->sg_cpu = dmam_alloc_coherent(host->dev, PAGE_SIZE,
2031 &host->sg_dma, GFP_KERNEL);
2032 if (!host->sg_cpu) {
2033 dev_err(host->dev, "%s: could not alloc DMA memory\n",
2034 __func__);
2035 goto no_dma;
2036 }
2037
2038 /* Determine which DMA interface to use */
2039 #ifdef CONFIG_MMC_DW_IDMAC
2040 host->dma_ops = &dw_mci_idmac_ops;
2041 dev_info(host->dev, "Using internal DMA controller.\n");
2042 #endif
2043
2044 if (!host->dma_ops)
2045 goto no_dma;
2046
2047 if (host->dma_ops->init && host->dma_ops->start &&
2048 host->dma_ops->stop && host->dma_ops->cleanup) {
2049 if (host->dma_ops->init(host)) {
2050 dev_err(host->dev, "%s: Unable to initialize "
2051 "DMA Controller.\n", __func__);
2052 goto no_dma;
2053 }
2054 } else {
2055 dev_err(host->dev, "DMA initialization not found.\n");
2056 goto no_dma;
2057 }
2058
2059 host->use_dma = 1;
2060 return;
2061
2062 no_dma:
2063 dev_info(host->dev, "Using PIO mode.\n");
2064 host->use_dma = 0;
2065 return;
2066 }
2067
2068 static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
2069 {
2070 unsigned long timeout = jiffies + msecs_to_jiffies(500);
2071 unsigned int ctrl;
2072
2073 mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
2074 SDMMC_CTRL_DMA_RESET));
2075
2076 /* wait till resets clear */
2077 do {
2078 ctrl = mci_readl(host, CTRL);
2079 if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
2080 SDMMC_CTRL_DMA_RESET)))
2081 return true;
2082 } while (time_before(jiffies, timeout));
2083
2084 dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
2085
2086 return false;
2087 }
2088
2089 #ifdef CONFIG_OF
2090 static struct dw_mci_of_quirks {
2091 char *quirk;
2092 int id;
2093 } of_quirks[] = {
2094 {
2095 .quirk = "supports-highspeed",
2096 .id = DW_MCI_QUIRK_HIGHSPEED,
2097 }, {
2098 .quirk = "broken-cd",
2099 .id = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
2100 },
2101 };
2102
2103 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2104 {
2105 struct dw_mci_board *pdata;
2106 struct device *dev = host->dev;
2107 struct device_node *np = dev->of_node;
2108 const struct dw_mci_drv_data *drv_data = host->drv_data;
2109 int idx, ret;
2110
2111 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
2112 if (!pdata) {
2113 dev_err(dev, "could not allocate memory for pdata\n");
2114 return ERR_PTR(-ENOMEM);
2115 }
2116
2117 /* find out number of slots supported */
2118 if (of_property_read_u32(dev->of_node, "num-slots",
2119 &pdata->num_slots)) {
2120 dev_info(dev, "num-slots property not found, "
2121 "assuming 1 slot is available\n");
2122 pdata->num_slots = 1;
2123 }
2124
2125 /* get quirks */
2126 for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
2127 if (of_get_property(np, of_quirks[idx].quirk, NULL))
2128 pdata->quirks |= of_quirks[idx].id;
2129
2130 if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
2131 dev_info(dev, "fifo-depth property not found, using "
2132 "value of FIFOTH register as default\n");
2133
2134 of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms);
2135
2136 if (drv_data && drv_data->parse_dt) {
2137 ret = drv_data->parse_dt(host);
2138 if (ret)
2139 return ERR_PTR(ret);
2140 }
2141
2142 if (of_find_property(np, "keep-power-in-suspend", NULL))
2143 pdata->pm_caps |= MMC_PM_KEEP_POWER;
2144
2145 if (of_find_property(np, "enable-sdio-wakeup", NULL))
2146 pdata->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
2147
2148 return pdata;
2149 }
2150
2151 #else /* CONFIG_OF */
2152 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
2153 {
2154 return ERR_PTR(-EINVAL);
2155 }
2156 #endif /* CONFIG_OF */
2157
2158 int dw_mci_probe(struct dw_mci *host)
2159 {
2160 const struct dw_mci_drv_data *drv_data = host->drv_data;
2161 int width, i, ret = 0;
2162 u32 fifo_size;
2163 int init_slots = 0;
2164
2165 if (!host->pdata) {
2166 host->pdata = dw_mci_parse_dt(host);
2167 if (IS_ERR(host->pdata)) {
2168 dev_err(host->dev, "platform data not available\n");
2169 return -EINVAL;
2170 }
2171 }
2172
2173 if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
2174 dev_err(host->dev,
2175 "Platform data must supply select_slot function\n");
2176 return -ENODEV;
2177 }
2178
2179 host->biu_clk = devm_clk_get(host->dev, "biu");
2180 if (IS_ERR(host->biu_clk)) {
2181 dev_dbg(host->dev, "biu clock not available\n");
2182 } else {
2183 ret = clk_prepare_enable(host->biu_clk);
2184 if (ret) {
2185 dev_err(host->dev, "failed to enable biu clock\n");
2186 return ret;
2187 }
2188 }
2189
2190 host->ciu_clk = devm_clk_get(host->dev, "ciu");
2191 if (IS_ERR(host->ciu_clk)) {
2192 dev_dbg(host->dev, "ciu clock not available\n");
2193 } else {
2194 ret = clk_prepare_enable(host->ciu_clk);
2195 if (ret) {
2196 dev_err(host->dev, "failed to enable ciu clock\n");
2197 goto err_clk_biu;
2198 }
2199 }
2200
2201 if (IS_ERR(host->ciu_clk))
2202 host->bus_hz = host->pdata->bus_hz;
2203 else
2204 host->bus_hz = clk_get_rate(host->ciu_clk);
2205
2206 if (drv_data && drv_data->setup_clock) {
2207 ret = drv_data->setup_clock(host);
2208 if (ret) {
2209 dev_err(host->dev,
2210 "implementation specific clock setup failed\n");
2211 goto err_clk_ciu;
2212 }
2213 }
2214
2215 if (!host->bus_hz) {
2216 dev_err(host->dev,
2217 "Platform data must supply bus speed\n");
2218 ret = -ENODEV;
2219 goto err_clk_ciu;
2220 }
2221
2222 host->quirks = host->pdata->quirks;
2223
2224 spin_lock_init(&host->lock);
2225 INIT_LIST_HEAD(&host->queue);
2226
2227 /*
2228 * Get the host data width - this assumes that HCON has been set with
2229 * the correct values.
2230 */
2231 i = (mci_readl(host, HCON) >> 7) & 0x7;
2232 if (!i) {
2233 host->push_data = dw_mci_push_data16;
2234 host->pull_data = dw_mci_pull_data16;
2235 width = 16;
2236 host->data_shift = 1;
2237 } else if (i == 2) {
2238 host->push_data = dw_mci_push_data64;
2239 host->pull_data = dw_mci_pull_data64;
2240 width = 64;
2241 host->data_shift = 3;
2242 } else {
2243 /* Check for a reserved value, and warn if it is */
2244 WARN((i != 1),
2245 "HCON reports a reserved host data width!\n"
2246 "Defaulting to 32-bit access.\n");
2247 host->push_data = dw_mci_push_data32;
2248 host->pull_data = dw_mci_pull_data32;
2249 width = 32;
2250 host->data_shift = 2;
2251 }
2252
2253 /* Reset all blocks */
2254 if (!mci_wait_reset(host->dev, host))
2255 return -ENODEV;
2256
2257 host->dma_ops = host->pdata->dma_ops;
2258 dw_mci_init_dma(host);
2259
2260 /* Clear the interrupts for the host controller */
2261 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2262 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2263
2264 /* Put in max timeout */
2265 mci_writel(host, TMOUT, 0xFFFFFFFF);
2266
2267 /*
2268 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
2269 * Tx Mark = fifo_size / 2 DMA Size = 8
2270 */
2271 if (!host->pdata->fifo_depth) {
2272 /*
2273 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
2274 * have been overwritten by the bootloader, just like we're
2275 * about to do, so if you know the value for your hardware, you
2276 * should put it in the platform data.
2277 */
2278 fifo_size = mci_readl(host, FIFOTH);
2279 fifo_size = 1 + ((fifo_size >> 16) & 0xfff);
2280 } else {
2281 fifo_size = host->pdata->fifo_depth;
2282 }
2283 host->fifo_depth = fifo_size;
2284 host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
2285 ((fifo_size/2) << 0));
2286 mci_writel(host, FIFOTH, host->fifoth_val);
2287
2288 /* disable clock to CIU */
2289 mci_writel(host, CLKENA, 0);
2290 mci_writel(host, CLKSRC, 0);
2291
2292 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
2293 host->card_workqueue = alloc_workqueue("dw-mci-card",
2294 WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
2295 if (!host->card_workqueue)
2296 goto err_dmaunmap;
2297 INIT_WORK(&host->card_work, dw_mci_work_routine_card);
2298 ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt,
2299 host->irq_flags, "dw-mci", host);
2300 if (ret)
2301 goto err_workqueue;
2302
2303 if (host->pdata->num_slots)
2304 host->num_slots = host->pdata->num_slots;
2305 else
2306 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
2307
2308 /*
2309 * Enable interrupts for command done, data over, data empty, card det,
2310 * receive ready and error such as transmit, receive timeout, crc error
2311 */
2312 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2313 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2314 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2315 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2316 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
2317
2318 dev_info(host->dev, "DW MMC controller at irq %d, "
2319 "%d bit host data width, "
2320 "%u deep fifo\n",
2321 host->irq, width, fifo_size);
2322
2323 /* We need at least one slot to succeed */
2324 for (i = 0; i < host->num_slots; i++) {
2325 ret = dw_mci_init_slot(host, i);
2326 if (ret)
2327 dev_dbg(host->dev, "slot %d init failed\n", i);
2328 else
2329 init_slots++;
2330 }
2331
2332 if (init_slots) {
2333 dev_info(host->dev, "%d slots initialized\n", init_slots);
2334 } else {
2335 dev_dbg(host->dev, "attempted to initialize %d slots, "
2336 "but failed on all\n", host->num_slots);
2337 goto err_workqueue;
2338 }
2339
2340 /*
2341 * In 2.40a spec, Data offset is changed.
2342 * Need to check the version-id and set data-offset for DATA register.
2343 */
2344 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID));
2345 dev_info(host->dev, "Version ID is %04x\n", host->verid);
2346
2347 if (host->verid < DW_MMC_240A)
2348 host->data_offset = DATA_OFFSET;
2349 else
2350 host->data_offset = DATA_240A_OFFSET;
2351
2352 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
2353 dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n");
2354
2355 return 0;
2356
2357 err_workqueue:
2358 destroy_workqueue(host->card_workqueue);
2359
2360 err_dmaunmap:
2361 if (host->use_dma && host->dma_ops->exit)
2362 host->dma_ops->exit(host);
2363
2364 if (host->vmmc)
2365 regulator_disable(host->vmmc);
2366
2367 err_clk_ciu:
2368 if (!IS_ERR(host->ciu_clk))
2369 clk_disable_unprepare(host->ciu_clk);
2370
2371 err_clk_biu:
2372 if (!IS_ERR(host->biu_clk))
2373 clk_disable_unprepare(host->biu_clk);
2374
2375 return ret;
2376 }
2377 EXPORT_SYMBOL(dw_mci_probe);
2378
2379 void dw_mci_remove(struct dw_mci *host)
2380 {
2381 int i;
2382
2383 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2384 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
2385
2386 for (i = 0; i < host->num_slots; i++) {
2387 dev_dbg(host->dev, "remove slot %d\n", i);
2388 if (host->slot[i])
2389 dw_mci_cleanup_slot(host->slot[i], i);
2390 }
2391
2392 /* disable clock to CIU */
2393 mci_writel(host, CLKENA, 0);
2394 mci_writel(host, CLKSRC, 0);
2395
2396 destroy_workqueue(host->card_workqueue);
2397
2398 if (host->use_dma && host->dma_ops->exit)
2399 host->dma_ops->exit(host);
2400
2401 if (host->vmmc)
2402 regulator_disable(host->vmmc);
2403
2404 if (!IS_ERR(host->ciu_clk))
2405 clk_disable_unprepare(host->ciu_clk);
2406
2407 if (!IS_ERR(host->biu_clk))
2408 clk_disable_unprepare(host->biu_clk);
2409 }
2410 EXPORT_SYMBOL(dw_mci_remove);
2411
2412
2413
2414 #ifdef CONFIG_PM_SLEEP
2415 /*
2416 * TODO: we should probably disable the clock to the card in the suspend path.
2417 */
2418 int dw_mci_suspend(struct dw_mci *host)
2419 {
2420 int i, ret = 0;
2421
2422 for (i = 0; i < host->num_slots; i++) {
2423 struct dw_mci_slot *slot = host->slot[i];
2424 if (!slot)
2425 continue;
2426 ret = mmc_suspend_host(slot->mmc);
2427 if (ret < 0) {
2428 while (--i >= 0) {
2429 slot = host->slot[i];
2430 if (slot)
2431 mmc_resume_host(host->slot[i]->mmc);
2432 }
2433 return ret;
2434 }
2435 }
2436
2437 if (host->vmmc)
2438 regulator_disable(host->vmmc);
2439
2440 return 0;
2441 }
2442 EXPORT_SYMBOL(dw_mci_suspend);
2443
2444 int dw_mci_resume(struct dw_mci *host)
2445 {
2446 int i, ret;
2447
2448 if (host->vmmc)
2449 regulator_enable(host->vmmc);
2450
2451 if (!mci_wait_reset(host->dev, host)) {
2452 ret = -ENODEV;
2453 return ret;
2454 }
2455
2456 if (host->use_dma && host->dma_ops->init)
2457 host->dma_ops->init(host);
2458
2459 /* Restore the old value at FIFOTH register */
2460 mci_writel(host, FIFOTH, host->fifoth_val);
2461
2462 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2463 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2464 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2465 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2466 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2467
2468 for (i = 0; i < host->num_slots; i++) {
2469 struct dw_mci_slot *slot = host->slot[i];
2470 if (!slot)
2471 continue;
2472 if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
2473 dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
2474 dw_mci_setup_bus(slot, true);
2475 }
2476
2477 ret = mmc_resume_host(host->slot[i]->mmc);
2478 if (ret < 0)
2479 return ret;
2480 }
2481 return 0;
2482 }
2483 EXPORT_SYMBOL(dw_mci_resume);
2484 #endif /* CONFIG_PM_SLEEP */
2485
2486 static int __init dw_mci_init(void)
2487 {
2488 printk(KERN_INFO "Synopsys Designware Multimedia Card Interface Driver");
2489 return 0;
2490 }
2491
2492 static void __exit dw_mci_exit(void)
2493 {
2494 }
2495
2496 module_init(dw_mci_init);
2497 module_exit(dw_mci_exit);
2498
2499 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2500 MODULE_AUTHOR("NXP Semiconductor VietNam");
2501 MODULE_AUTHOR("Imagination Technologies Ltd");
2502 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support