2 * Synopsys DesignWare Multimedia Card Interface driver
3 * (Based on NXP driver for lpc 31xx)
5 * Copyright (C) 2009 NXP Semiconductors
6 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
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.
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/scatterlist.h>
26 #include <linux/seq_file.h>
27 #include <linux/slab.h>
28 #include <linux/stat.h>
29 #include <linux/delay.h>
30 #include <linux/irq.h>
31 #include <linux/mmc/host.h>
32 #include <linux/mmc/mmc.h>
33 #include <linux/mmc/dw_mmc.h>
34 #include <linux/bitops.h>
35 #include <linux/regulator/consumer.h>
36 #include <linux/workqueue.h>
40 /* Common flag combinations */
41 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DTO | SDMMC_INT_DCRC | \
42 SDMMC_INT_HTO | SDMMC_INT_SBE | \
44 #define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
46 #define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
47 DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
48 #define DW_MCI_SEND_STATUS 1
49 #define DW_MCI_RECV_STATUS 2
50 #define DW_MCI_DMA_THRESHOLD 16
52 #ifdef CONFIG_MMC_DW_IDMAC
54 u32 des0; /* Control Descriptor */
55 #define IDMAC_DES0_DIC BIT(1)
56 #define IDMAC_DES0_LD BIT(2)
57 #define IDMAC_DES0_FD BIT(3)
58 #define IDMAC_DES0_CH BIT(4)
59 #define IDMAC_DES0_ER BIT(5)
60 #define IDMAC_DES0_CES BIT(30)
61 #define IDMAC_DES0_OWN BIT(31)
63 u32 des1; /* Buffer sizes */
64 #define IDMAC_SET_BUFFER1_SIZE(d, s) \
65 ((d)->des1 = ((d)->des1 & 0x03ffc000) | ((s) & 0x3fff))
67 u32 des2; /* buffer 1 physical address */
69 u32 des3; /* buffer 2 physical address */
71 #endif /* CONFIG_MMC_DW_IDMAC */
74 * struct dw_mci_slot - MMC slot state
75 * @mmc: The mmc_host representing this slot.
76 * @host: The MMC controller this slot is using.
77 * @ctype: Card type for this slot.
78 * @mrq: mmc_request currently being processed or waiting to be
79 * processed, or NULL when the slot is idle.
80 * @queue_node: List node for placing this node in the @queue list of
82 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
83 * @flags: Random state bits associated with the slot.
84 * @id: Number of this slot.
85 * @last_detect_state: Most recently observed card detect state.
93 struct mmc_request *mrq;
94 struct list_head queue_node;
98 #define DW_MMC_CARD_PRESENT 0
99 #define DW_MMC_CARD_NEED_INIT 1
101 int last_detect_state;
104 static struct workqueue_struct *dw_mci_card_workqueue;
106 #if defined(CONFIG_DEBUG_FS)
107 static int dw_mci_req_show(struct seq_file *s, void *v)
109 struct dw_mci_slot *slot = s->private;
110 struct mmc_request *mrq;
111 struct mmc_command *cmd;
112 struct mmc_command *stop;
113 struct mmc_data *data;
115 /* Make sure we get a consistent snapshot */
116 spin_lock_bh(&slot->host->lock);
126 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
127 cmd->opcode, cmd->arg, cmd->flags,
128 cmd->resp[0], cmd->resp[1], cmd->resp[2],
129 cmd->resp[2], cmd->error);
131 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
132 data->bytes_xfered, data->blocks,
133 data->blksz, data->flags, data->error);
136 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
137 stop->opcode, stop->arg, stop->flags,
138 stop->resp[0], stop->resp[1], stop->resp[2],
139 stop->resp[2], stop->error);
142 spin_unlock_bh(&slot->host->lock);
147 static int dw_mci_req_open(struct inode *inode, struct file *file)
149 return single_open(file, dw_mci_req_show, inode->i_private);
152 static const struct file_operations dw_mci_req_fops = {
153 .owner = THIS_MODULE,
154 .open = dw_mci_req_open,
157 .release = single_release,
160 static int dw_mci_regs_show(struct seq_file *s, void *v)
162 seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
163 seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
164 seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
165 seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
166 seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
167 seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
172 static int dw_mci_regs_open(struct inode *inode, struct file *file)
174 return single_open(file, dw_mci_regs_show, inode->i_private);
177 static const struct file_operations dw_mci_regs_fops = {
178 .owner = THIS_MODULE,
179 .open = dw_mci_regs_open,
182 .release = single_release,
185 static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
187 struct mmc_host *mmc = slot->mmc;
188 struct dw_mci *host = slot->host;
192 root = mmc->debugfs_root;
196 node = debugfs_create_file("regs", S_IRUSR, root, host,
201 node = debugfs_create_file("req", S_IRUSR, root, slot,
206 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
210 node = debugfs_create_x32("pending_events", S_IRUSR, root,
211 (u32 *)&host->pending_events);
215 node = debugfs_create_x32("completed_events", S_IRUSR, root,
216 (u32 *)&host->completed_events);
223 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
225 #endif /* defined(CONFIG_DEBUG_FS) */
227 static void dw_mci_set_timeout(struct dw_mci *host)
229 /* timeout (maximum) */
230 mci_writel(host, TMOUT, 0xffffffff);
233 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
235 struct mmc_data *data;
237 cmd->error = -EINPROGRESS;
241 if (cmdr == MMC_STOP_TRANSMISSION)
242 cmdr |= SDMMC_CMD_STOP;
244 cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
246 if (cmd->flags & MMC_RSP_PRESENT) {
247 /* We expect a response, so set this bit */
248 cmdr |= SDMMC_CMD_RESP_EXP;
249 if (cmd->flags & MMC_RSP_136)
250 cmdr |= SDMMC_CMD_RESP_LONG;
253 if (cmd->flags & MMC_RSP_CRC)
254 cmdr |= SDMMC_CMD_RESP_CRC;
258 cmdr |= SDMMC_CMD_DAT_EXP;
259 if (data->flags & MMC_DATA_STREAM)
260 cmdr |= SDMMC_CMD_STRM_MODE;
261 if (data->flags & MMC_DATA_WRITE)
262 cmdr |= SDMMC_CMD_DAT_WR;
268 static void dw_mci_start_command(struct dw_mci *host,
269 struct mmc_command *cmd, u32 cmd_flags)
272 dev_vdbg(&host->pdev->dev,
273 "start command: ARGR=0x%08x CMDR=0x%08x\n",
274 cmd->arg, cmd_flags);
276 mci_writel(host, CMDARG, cmd->arg);
279 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
282 static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
284 dw_mci_start_command(host, data->stop, host->stop_cmdr);
287 /* DMA interface functions */
288 static void dw_mci_stop_dma(struct dw_mci *host)
290 if (host->using_dma) {
291 host->dma_ops->stop(host);
292 host->dma_ops->cleanup(host);
294 /* Data transfer was stopped by the interrupt handler */
295 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
299 #ifdef CONFIG_MMC_DW_IDMAC
300 static void dw_mci_dma_cleanup(struct dw_mci *host)
302 struct mmc_data *data = host->data;
305 dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
306 ((data->flags & MMC_DATA_WRITE)
307 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
310 static void dw_mci_idmac_stop_dma(struct dw_mci *host)
314 /* Disable and reset the IDMAC interface */
315 temp = mci_readl(host, CTRL);
316 temp &= ~SDMMC_CTRL_USE_IDMAC;
317 temp |= SDMMC_CTRL_DMA_RESET;
318 mci_writel(host, CTRL, temp);
320 /* Stop the IDMAC running */
321 temp = mci_readl(host, BMOD);
322 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB);
323 mci_writel(host, BMOD, temp);
326 static void dw_mci_idmac_complete_dma(struct dw_mci *host)
328 struct mmc_data *data = host->data;
330 dev_vdbg(&host->pdev->dev, "DMA complete\n");
332 host->dma_ops->cleanup(host);
335 * If the card was removed, data will be NULL. No point in trying to
336 * send the stop command or waiting for NBUSY in this case.
339 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
340 tasklet_schedule(&host->tasklet);
344 static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
348 struct idmac_desc *desc = host->sg_cpu;
350 for (i = 0; i < sg_len; i++, desc++) {
351 unsigned int length = sg_dma_len(&data->sg[i]);
352 u32 mem_addr = sg_dma_address(&data->sg[i]);
354 /* Set the OWN bit and disable interrupts for this descriptor */
355 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
358 IDMAC_SET_BUFFER1_SIZE(desc, length);
360 /* Physical address to DMA to/from */
361 desc->des2 = mem_addr;
364 /* Set first descriptor */
366 desc->des0 |= IDMAC_DES0_FD;
368 /* Set last descriptor */
369 desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
370 desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
371 desc->des0 |= IDMAC_DES0_LD;
376 static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
380 dw_mci_translate_sglist(host, host->data, sg_len);
382 /* Select IDMAC interface */
383 temp = mci_readl(host, CTRL);
384 temp |= SDMMC_CTRL_USE_IDMAC;
385 mci_writel(host, CTRL, temp);
389 /* Enable the IDMAC */
390 temp = mci_readl(host, BMOD);
391 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB;
392 mci_writel(host, BMOD, temp);
394 /* Start it running */
395 mci_writel(host, PLDMND, 1);
398 static int dw_mci_idmac_init(struct dw_mci *host)
400 struct idmac_desc *p;
403 /* Number of descriptors in the ring buffer */
404 host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
406 /* Forward link the descriptor list */
407 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
408 p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
410 /* Set the last descriptor as the end-of-ring descriptor */
411 p->des3 = host->sg_dma;
412 p->des0 = IDMAC_DES0_ER;
414 /* Mask out interrupts - get Tx & Rx complete only */
415 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
418 /* Set the descriptor base address */
419 mci_writel(host, DBADDR, host->sg_dma);
423 static struct dw_mci_dma_ops dw_mci_idmac_ops = {
424 .init = dw_mci_idmac_init,
425 .start = dw_mci_idmac_start_dma,
426 .stop = dw_mci_idmac_stop_dma,
427 .complete = dw_mci_idmac_complete_dma,
428 .cleanup = dw_mci_dma_cleanup,
430 #endif /* CONFIG_MMC_DW_IDMAC */
432 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
434 struct scatterlist *sg;
435 unsigned int i, direction, sg_len;
440 /* If we don't have a channel, we can't do DMA */
445 * We don't do DMA on "complex" transfers, i.e. with
446 * non-word-aligned buffers or lengths. Also, we don't bother
447 * with all the DMA setup overhead for short transfers.
449 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
454 for_each_sg(data->sg, sg, data->sg_len, i) {
455 if (sg->offset & 3 || sg->length & 3)
461 if (data->flags & MMC_DATA_READ)
462 direction = DMA_FROM_DEVICE;
464 direction = DMA_TO_DEVICE;
466 sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len,
469 dev_vdbg(&host->pdev->dev,
470 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
471 (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
474 /* Enable the DMA interface */
475 temp = mci_readl(host, CTRL);
476 temp |= SDMMC_CTRL_DMA_ENABLE;
477 mci_writel(host, CTRL, temp);
479 /* Disable RX/TX IRQs, let DMA handle it */
480 temp = mci_readl(host, INTMASK);
481 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
482 mci_writel(host, INTMASK, temp);
484 host->dma_ops->start(host, sg_len);
489 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
493 data->error = -EINPROGRESS;
499 if (data->flags & MMC_DATA_READ)
500 host->dir_status = DW_MCI_RECV_STATUS;
502 host->dir_status = DW_MCI_SEND_STATUS;
504 if (dw_mci_submit_data_dma(host, data)) {
506 host->pio_offset = 0;
507 host->part_buf_start = 0;
508 host->part_buf_count = 0;
510 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR);
511 temp = mci_readl(host, INTMASK);
512 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
513 mci_writel(host, INTMASK, temp);
515 temp = mci_readl(host, CTRL);
516 temp &= ~SDMMC_CTRL_DMA_ENABLE;
517 mci_writel(host, CTRL, temp);
521 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
523 struct dw_mci *host = slot->host;
524 unsigned long timeout = jiffies + msecs_to_jiffies(500);
525 unsigned int cmd_status = 0;
527 mci_writel(host, CMDARG, arg);
529 mci_writel(host, CMD, SDMMC_CMD_START | cmd);
531 while (time_before(jiffies, timeout)) {
532 cmd_status = mci_readl(host, CMD);
533 if (!(cmd_status & SDMMC_CMD_START))
536 dev_err(&slot->mmc->class_dev,
537 "Timeout sending command (cmd %#x arg %#x status %#x)\n",
538 cmd, arg, cmd_status);
541 static void dw_mci_setup_bus(struct dw_mci_slot *slot)
543 struct dw_mci *host = slot->host;
546 if (slot->clock != host->current_speed) {
547 if (host->bus_hz % slot->clock)
549 * move the + 1 after the divide to prevent
550 * over-clocking the card.
552 div = ((host->bus_hz / slot->clock) >> 1) + 1;
554 div = (host->bus_hz / slot->clock) >> 1;
556 dev_info(&slot->mmc->class_dev,
557 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
558 " div = %d)\n", slot->id, host->bus_hz, slot->clock,
559 div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
562 mci_writel(host, CLKENA, 0);
563 mci_writel(host, CLKSRC, 0);
567 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
569 /* set clock to desired speed */
570 mci_writel(host, CLKDIV, div);
574 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
577 mci_writel(host, CLKENA, SDMMC_CLKEN_ENABLE |
578 SDMMC_CLKEN_LOW_PWR);
582 SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
584 host->current_speed = slot->clock;
587 /* Set the current slot bus width */
588 mci_writel(host, CTYPE, (slot->ctype << slot->id));
591 static void dw_mci_start_request(struct dw_mci *host,
592 struct dw_mci_slot *slot)
594 struct mmc_request *mrq;
595 struct mmc_command *cmd;
596 struct mmc_data *data;
600 if (host->pdata->select_slot)
601 host->pdata->select_slot(slot->id);
603 /* Slot specific timing and width adjustment */
604 dw_mci_setup_bus(slot);
606 host->cur_slot = slot;
609 host->pending_events = 0;
610 host->completed_events = 0;
611 host->data_status = 0;
615 dw_mci_set_timeout(host);
616 mci_writel(host, BYTCNT, data->blksz*data->blocks);
617 mci_writel(host, BLKSIZ, data->blksz);
621 cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
623 /* this is the first command, send the initialization clock */
624 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
625 cmdflags |= SDMMC_CMD_INIT;
628 dw_mci_submit_data(host, data);
632 dw_mci_start_command(host, cmd, cmdflags);
635 host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
638 /* must be called with host->lock held */
639 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
640 struct mmc_request *mrq)
642 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
647 if (host->state == STATE_IDLE) {
648 host->state = STATE_SENDING_CMD;
649 dw_mci_start_request(host, slot);
651 list_add_tail(&slot->queue_node, &host->queue);
655 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
657 struct dw_mci_slot *slot = mmc_priv(mmc);
658 struct dw_mci *host = slot->host;
663 * The check for card presence and queueing of the request must be
664 * atomic, otherwise the card could be removed in between and the
665 * request wouldn't fail until another card was inserted.
667 spin_lock_bh(&host->lock);
669 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
670 spin_unlock_bh(&host->lock);
671 mrq->cmd->error = -ENOMEDIUM;
672 mmc_request_done(mmc, mrq);
676 dw_mci_queue_request(host, slot, mrq);
678 spin_unlock_bh(&host->lock);
681 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
683 struct dw_mci_slot *slot = mmc_priv(mmc);
686 /* set default 1 bit mode */
687 slot->ctype = SDMMC_CTYPE_1BIT;
689 switch (ios->bus_width) {
690 case MMC_BUS_WIDTH_1:
691 slot->ctype = SDMMC_CTYPE_1BIT;
693 case MMC_BUS_WIDTH_4:
694 slot->ctype = SDMMC_CTYPE_4BIT;
696 case MMC_BUS_WIDTH_8:
697 slot->ctype = SDMMC_CTYPE_8BIT;
703 regs = mci_readl(slot->host, UHS_REG);
704 regs |= (0x1 << slot->id) << 16;
705 mci_writel(slot->host, UHS_REG, regs);
710 * Use mirror of ios->clock to prevent race with mmc
711 * core ios update when finding the minimum.
713 slot->clock = ios->clock;
716 switch (ios->power_mode) {
718 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
725 static int dw_mci_get_ro(struct mmc_host *mmc)
728 struct dw_mci_slot *slot = mmc_priv(mmc);
729 struct dw_mci_board *brd = slot->host->pdata;
731 /* Use platform get_ro function, else try on board write protect */
733 read_only = brd->get_ro(slot->id);
736 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
738 dev_dbg(&mmc->class_dev, "card is %s\n",
739 read_only ? "read-only" : "read-write");
744 static int dw_mci_get_cd(struct mmc_host *mmc)
747 struct dw_mci_slot *slot = mmc_priv(mmc);
748 struct dw_mci_board *brd = slot->host->pdata;
750 /* Use platform get_cd function, else try onboard card detect */
751 if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
753 else if (brd->get_cd)
754 present = !brd->get_cd(slot->id);
756 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
760 dev_dbg(&mmc->class_dev, "card is present\n");
762 dev_dbg(&mmc->class_dev, "card is not present\n");
767 static const struct mmc_host_ops dw_mci_ops = {
768 .request = dw_mci_request,
769 .set_ios = dw_mci_set_ios,
770 .get_ro = dw_mci_get_ro,
771 .get_cd = dw_mci_get_cd,
774 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
775 __releases(&host->lock)
776 __acquires(&host->lock)
778 struct dw_mci_slot *slot;
779 struct mmc_host *prev_mmc = host->cur_slot->mmc;
781 WARN_ON(host->cmd || host->data);
783 host->cur_slot->mrq = NULL;
785 if (!list_empty(&host->queue)) {
786 slot = list_entry(host->queue.next,
787 struct dw_mci_slot, queue_node);
788 list_del(&slot->queue_node);
789 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
790 mmc_hostname(slot->mmc));
791 host->state = STATE_SENDING_CMD;
792 dw_mci_start_request(host, slot);
794 dev_vdbg(&host->pdev->dev, "list empty\n");
795 host->state = STATE_IDLE;
798 spin_unlock(&host->lock);
799 mmc_request_done(prev_mmc, mrq);
800 spin_lock(&host->lock);
803 static void dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd)
805 u32 status = host->cmd_status;
807 host->cmd_status = 0;
809 /* Read the response from the card (up to 16 bytes) */
810 if (cmd->flags & MMC_RSP_PRESENT) {
811 if (cmd->flags & MMC_RSP_136) {
812 cmd->resp[3] = mci_readl(host, RESP0);
813 cmd->resp[2] = mci_readl(host, RESP1);
814 cmd->resp[1] = mci_readl(host, RESP2);
815 cmd->resp[0] = mci_readl(host, RESP3);
817 cmd->resp[0] = mci_readl(host, RESP0);
824 if (status & SDMMC_INT_RTO)
825 cmd->error = -ETIMEDOUT;
826 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
827 cmd->error = -EILSEQ;
828 else if (status & SDMMC_INT_RESP_ERR)
834 /* newer ip versions need a delay between retries */
835 if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
840 dw_mci_stop_dma(host);
845 static void dw_mci_tasklet_func(unsigned long priv)
847 struct dw_mci *host = (struct dw_mci *)priv;
848 struct mmc_data *data;
849 struct mmc_command *cmd;
850 enum dw_mci_state state;
851 enum dw_mci_state prev_state;
854 spin_lock(&host->lock);
866 case STATE_SENDING_CMD:
867 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
868 &host->pending_events))
873 set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
874 dw_mci_command_complete(host, host->mrq->cmd);
875 if (!host->mrq->data || cmd->error) {
876 dw_mci_request_end(host, host->mrq);
880 prev_state = state = STATE_SENDING_DATA;
883 case STATE_SENDING_DATA:
884 if (test_and_clear_bit(EVENT_DATA_ERROR,
885 &host->pending_events)) {
886 dw_mci_stop_dma(host);
888 send_stop_cmd(host, data);
889 state = STATE_DATA_ERROR;
893 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
894 &host->pending_events))
897 set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
898 prev_state = state = STATE_DATA_BUSY;
901 case STATE_DATA_BUSY:
902 if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
903 &host->pending_events))
907 set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
908 status = host->data_status;
910 if (status & DW_MCI_DATA_ERROR_FLAGS) {
911 if (status & SDMMC_INT_DTO) {
912 data->error = -ETIMEDOUT;
913 } else if (status & SDMMC_INT_DCRC) {
914 data->error = -EILSEQ;
915 } else if (status & SDMMC_INT_EBE &&
917 DW_MCI_SEND_STATUS) {
919 * No data CRC status was returned.
920 * The number of bytes transferred will
921 * be exaggerated in PIO mode.
923 data->bytes_xfered = 0;
924 data->error = -ETIMEDOUT;
926 dev_err(&host->pdev->dev,
933 * After an error, there may be data lingering
934 * in the FIFO, so reset it - doing so
935 * generates a block interrupt, hence setting
936 * the scatter-gather pointer to NULL.
939 ctrl = mci_readl(host, CTRL);
940 ctrl |= SDMMC_CTRL_FIFO_RESET;
941 mci_writel(host, CTRL, ctrl);
943 data->bytes_xfered = data->blocks * data->blksz;
948 dw_mci_request_end(host, host->mrq);
952 prev_state = state = STATE_SENDING_STOP;
954 send_stop_cmd(host, data);
957 case STATE_SENDING_STOP:
958 if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
959 &host->pending_events))
963 dw_mci_command_complete(host, host->mrq->stop);
964 dw_mci_request_end(host, host->mrq);
967 case STATE_DATA_ERROR:
968 if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
969 &host->pending_events))
972 state = STATE_DATA_BUSY;
975 } while (state != prev_state);
979 spin_unlock(&host->lock);
983 /* push final bytes to part_buf, only use during push */
984 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt)
986 memcpy((void *)&host->part_buf, buf, cnt);
987 host->part_buf_count = cnt;
990 /* append bytes to part_buf, only use during push */
991 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt)
993 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count);
994 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt);
995 host->part_buf_count += cnt;
999 /* pull first bytes from part_buf, only use during pull */
1000 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt)
1002 cnt = min(cnt, (int)host->part_buf_count);
1004 memcpy(buf, (void *)&host->part_buf + host->part_buf_start,
1006 host->part_buf_count -= cnt;
1007 host->part_buf_start += cnt;
1012 /* pull final bytes from the part_buf, assuming it's just been filled */
1013 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt)
1015 memcpy(buf, &host->part_buf, cnt);
1016 host->part_buf_start = cnt;
1017 host->part_buf_count = (1 << host->data_shift) - cnt;
1020 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
1022 /* try and push anything in the part_buf */
1023 if (unlikely(host->part_buf_count)) {
1024 int len = dw_mci_push_part_bytes(host, buf, cnt);
1027 if (!sg_next(host->sg) || host->part_buf_count == 2) {
1028 mci_writew(host, DATA, host->part_buf16);
1029 host->part_buf_count = 0;
1032 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1033 if (unlikely((unsigned long)buf & 0x1)) {
1035 u16 aligned_buf[64];
1036 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1037 int items = len >> 1;
1039 /* memcpy from input buffer into aligned buffer */
1040 memcpy(aligned_buf, buf, len);
1043 /* push data from aligned buffer into fifo */
1044 for (i = 0; i < items; ++i)
1045 mci_writew(host, DATA, aligned_buf[i]);
1051 for (; cnt >= 2; cnt -= 2)
1052 mci_writew(host, DATA, *pdata++);
1055 /* put anything remaining in the part_buf */
1057 dw_mci_set_part_bytes(host, buf, cnt);
1058 if (!sg_next(host->sg))
1059 mci_writew(host, DATA, host->part_buf16);
1063 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
1065 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1066 if (unlikely((unsigned long)buf & 0x1)) {
1068 /* pull data from fifo into aligned buffer */
1069 u16 aligned_buf[64];
1070 int len = min(cnt & -2, (int)sizeof(aligned_buf));
1071 int items = len >> 1;
1073 for (i = 0; i < items; ++i)
1074 aligned_buf[i] = mci_readw(host, DATA);
1075 /* memcpy from aligned buffer into output buffer */
1076 memcpy(buf, aligned_buf, len);
1084 for (; cnt >= 2; cnt -= 2)
1085 *pdata++ = mci_readw(host, DATA);
1089 host->part_buf16 = mci_readw(host, DATA);
1090 dw_mci_pull_final_bytes(host, buf, cnt);
1094 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
1096 /* try and push anything in the part_buf */
1097 if (unlikely(host->part_buf_count)) {
1098 int len = dw_mci_push_part_bytes(host, buf, cnt);
1101 if (!sg_next(host->sg) || host->part_buf_count == 4) {
1102 mci_writel(host, DATA, host->part_buf32);
1103 host->part_buf_count = 0;
1106 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1107 if (unlikely((unsigned long)buf & 0x3)) {
1109 u32 aligned_buf[32];
1110 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1111 int items = len >> 2;
1113 /* memcpy from input buffer into aligned buffer */
1114 memcpy(aligned_buf, buf, len);
1117 /* push data from aligned buffer into fifo */
1118 for (i = 0; i < items; ++i)
1119 mci_writel(host, DATA, aligned_buf[i]);
1125 for (; cnt >= 4; cnt -= 4)
1126 mci_writel(host, DATA, *pdata++);
1129 /* put anything remaining in the part_buf */
1131 dw_mci_set_part_bytes(host, buf, cnt);
1132 if (!sg_next(host->sg))
1133 mci_writel(host, DATA, host->part_buf32);
1137 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
1139 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1140 if (unlikely((unsigned long)buf & 0x3)) {
1142 /* pull data from fifo into aligned buffer */
1143 u32 aligned_buf[32];
1144 int len = min(cnt & -4, (int)sizeof(aligned_buf));
1145 int items = len >> 2;
1147 for (i = 0; i < items; ++i)
1148 aligned_buf[i] = mci_readl(host, DATA);
1149 /* memcpy from aligned buffer into output buffer */
1150 memcpy(buf, aligned_buf, len);
1158 for (; cnt >= 4; cnt -= 4)
1159 *pdata++ = mci_readl(host, DATA);
1163 host->part_buf32 = mci_readl(host, DATA);
1164 dw_mci_pull_final_bytes(host, buf, cnt);
1168 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
1170 /* try and push anything in the part_buf */
1171 if (unlikely(host->part_buf_count)) {
1172 int len = dw_mci_push_part_bytes(host, buf, cnt);
1175 if (!sg_next(host->sg) || host->part_buf_count == 8) {
1176 mci_writew(host, DATA, host->part_buf);
1177 host->part_buf_count = 0;
1180 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1181 if (unlikely((unsigned long)buf & 0x7)) {
1183 u64 aligned_buf[16];
1184 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1185 int items = len >> 3;
1187 /* memcpy from input buffer into aligned buffer */
1188 memcpy(aligned_buf, buf, len);
1191 /* push data from aligned buffer into fifo */
1192 for (i = 0; i < items; ++i)
1193 mci_writeq(host, DATA, aligned_buf[i]);
1199 for (; cnt >= 8; cnt -= 8)
1200 mci_writeq(host, DATA, *pdata++);
1203 /* put anything remaining in the part_buf */
1205 dw_mci_set_part_bytes(host, buf, cnt);
1206 if (!sg_next(host->sg))
1207 mci_writeq(host, DATA, host->part_buf);
1211 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
1213 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1214 if (unlikely((unsigned long)buf & 0x7)) {
1216 /* pull data from fifo into aligned buffer */
1217 u64 aligned_buf[16];
1218 int len = min(cnt & -8, (int)sizeof(aligned_buf));
1219 int items = len >> 3;
1221 for (i = 0; i < items; ++i)
1222 aligned_buf[i] = mci_readq(host, DATA);
1223 /* memcpy from aligned buffer into output buffer */
1224 memcpy(buf, aligned_buf, len);
1232 for (; cnt >= 8; cnt -= 8)
1233 *pdata++ = mci_readq(host, DATA);
1237 host->part_buf = mci_readq(host, DATA);
1238 dw_mci_pull_final_bytes(host, buf, cnt);
1242 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
1246 /* get remaining partial bytes */
1247 len = dw_mci_pull_part_bytes(host, buf, cnt);
1248 if (unlikely(len == cnt))
1253 /* get the rest of the data */
1254 host->pull_data(host, buf, cnt);
1257 static void dw_mci_read_data_pio(struct dw_mci *host)
1259 struct scatterlist *sg = host->sg;
1260 void *buf = sg_virt(sg);
1261 unsigned int offset = host->pio_offset;
1262 struct mmc_data *data = host->data;
1263 int shift = host->data_shift;
1265 unsigned int nbytes = 0, len;
1268 len = host->part_buf_count +
1269 (SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift);
1270 if (offset + len <= sg->length) {
1271 dw_mci_pull_data(host, (void *)(buf + offset), len);
1276 if (offset == sg->length) {
1277 flush_dcache_page(sg_page(sg));
1278 host->sg = sg = sg_next(sg);
1286 unsigned int remaining = sg->length - offset;
1287 dw_mci_pull_data(host, (void *)(buf + offset),
1289 nbytes += remaining;
1291 flush_dcache_page(sg_page(sg));
1292 host->sg = sg = sg_next(sg);
1296 offset = len - remaining;
1298 dw_mci_pull_data(host, buf, offset);
1302 status = mci_readl(host, MINTSTS);
1303 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1304 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1305 host->data_status = status;
1306 data->bytes_xfered += nbytes;
1309 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1311 tasklet_schedule(&host->tasklet);
1314 } while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
1315 host->pio_offset = offset;
1316 data->bytes_xfered += nbytes;
1320 data->bytes_xfered += nbytes;
1322 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1325 static void dw_mci_write_data_pio(struct dw_mci *host)
1327 struct scatterlist *sg = host->sg;
1328 void *buf = sg_virt(sg);
1329 unsigned int offset = host->pio_offset;
1330 struct mmc_data *data = host->data;
1331 int shift = host->data_shift;
1333 unsigned int nbytes = 0, len;
1336 len = ((host->fifo_depth -
1337 SDMMC_GET_FCNT(mci_readl(host, STATUS))) << shift)
1338 - host->part_buf_count;
1339 if (offset + len <= sg->length) {
1340 host->push_data(host, (void *)(buf + offset), len);
1344 if (offset == sg->length) {
1345 host->sg = sg = sg_next(sg);
1353 unsigned int remaining = sg->length - offset;
1355 host->push_data(host, (void *)(buf + offset),
1357 nbytes += remaining;
1359 host->sg = sg = sg_next(sg);
1363 offset = len - remaining;
1365 host->push_data(host, (void *)buf, offset);
1369 status = mci_readl(host, MINTSTS);
1370 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1371 if (status & DW_MCI_DATA_ERROR_FLAGS) {
1372 host->data_status = status;
1373 data->bytes_xfered += nbytes;
1377 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1379 tasklet_schedule(&host->tasklet);
1382 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
1383 host->pio_offset = offset;
1384 data->bytes_xfered += nbytes;
1388 data->bytes_xfered += nbytes;
1390 set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
1393 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
1395 if (!host->cmd_status)
1396 host->cmd_status = status;
1400 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1401 tasklet_schedule(&host->tasklet);
1404 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
1406 struct dw_mci *host = dev_id;
1407 u32 status, pending;
1408 unsigned int pass_count = 0;
1411 status = mci_readl(host, RINTSTS);
1412 pending = mci_readl(host, MINTSTS); /* read-only mask reg */
1415 * DTO fix - version 2.10a and below, and only if internal DMA
1418 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
1420 ((mci_readl(host, STATUS) >> 17) & 0x1fff))
1421 pending |= SDMMC_INT_DATA_OVER;
1427 if (pending & DW_MCI_CMD_ERROR_FLAGS) {
1428 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
1429 host->cmd_status = status;
1431 set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
1434 if (pending & DW_MCI_DATA_ERROR_FLAGS) {
1435 /* if there is an error report DATA_ERROR */
1436 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
1437 host->data_status = status;
1439 set_bit(EVENT_DATA_ERROR, &host->pending_events);
1440 if (!(pending & (SDMMC_INT_DTO | SDMMC_INT_DCRC |
1441 SDMMC_INT_SBE | SDMMC_INT_EBE)))
1442 tasklet_schedule(&host->tasklet);
1445 if (pending & SDMMC_INT_DATA_OVER) {
1446 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
1447 if (!host->data_status)
1448 host->data_status = status;
1450 if (host->dir_status == DW_MCI_RECV_STATUS) {
1451 if (host->sg != NULL)
1452 dw_mci_read_data_pio(host);
1454 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1455 tasklet_schedule(&host->tasklet);
1458 if (pending & SDMMC_INT_RXDR) {
1459 mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
1460 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
1461 dw_mci_read_data_pio(host);
1464 if (pending & SDMMC_INT_TXDR) {
1465 mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
1466 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg)
1467 dw_mci_write_data_pio(host);
1470 if (pending & SDMMC_INT_CMD_DONE) {
1471 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
1472 dw_mci_cmd_interrupt(host, status);
1475 if (pending & SDMMC_INT_CD) {
1476 mci_writel(host, RINTSTS, SDMMC_INT_CD);
1477 queue_work(dw_mci_card_workqueue, &host->card_work);
1480 } while (pass_count++ < 5);
1482 #ifdef CONFIG_MMC_DW_IDMAC
1483 /* Handle DMA interrupts */
1484 pending = mci_readl(host, IDSTS);
1485 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
1486 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
1487 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
1488 set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
1489 host->dma_ops->complete(host);
1496 static void dw_mci_work_routine_card(struct work_struct *work)
1498 struct dw_mci *host = container_of(work, struct dw_mci, card_work);
1501 for (i = 0; i < host->num_slots; i++) {
1502 struct dw_mci_slot *slot = host->slot[i];
1503 struct mmc_host *mmc = slot->mmc;
1504 struct mmc_request *mrq;
1508 present = dw_mci_get_cd(mmc);
1509 while (present != slot->last_detect_state) {
1510 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1511 present ? "inserted" : "removed");
1513 /* Power up slot (before spin_lock, may sleep) */
1514 if (present != 0 && host->pdata->setpower)
1515 host->pdata->setpower(slot->id, mmc->ocr_avail);
1517 spin_lock_bh(&host->lock);
1519 /* Card change detected */
1520 slot->last_detect_state = present;
1522 /* Mark card as present if applicable */
1524 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1526 /* Clean up queue if present */
1529 if (mrq == host->mrq) {
1533 switch (host->state) {
1536 case STATE_SENDING_CMD:
1537 mrq->cmd->error = -ENOMEDIUM;
1541 case STATE_SENDING_DATA:
1542 mrq->data->error = -ENOMEDIUM;
1543 dw_mci_stop_dma(host);
1545 case STATE_DATA_BUSY:
1546 case STATE_DATA_ERROR:
1547 if (mrq->data->error == -EINPROGRESS)
1548 mrq->data->error = -ENOMEDIUM;
1552 case STATE_SENDING_STOP:
1553 mrq->stop->error = -ENOMEDIUM;
1557 dw_mci_request_end(host, mrq);
1559 list_del(&slot->queue_node);
1560 mrq->cmd->error = -ENOMEDIUM;
1562 mrq->data->error = -ENOMEDIUM;
1564 mrq->stop->error = -ENOMEDIUM;
1566 spin_unlock(&host->lock);
1567 mmc_request_done(slot->mmc, mrq);
1568 spin_lock(&host->lock);
1572 /* Power down slot */
1574 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1577 * Clear down the FIFO - doing so generates a
1578 * block interrupt, hence setting the
1579 * scatter-gather pointer to NULL.
1583 ctrl = mci_readl(host, CTRL);
1584 ctrl |= SDMMC_CTRL_FIFO_RESET;
1585 mci_writel(host, CTRL, ctrl);
1587 #ifdef CONFIG_MMC_DW_IDMAC
1588 ctrl = mci_readl(host, BMOD);
1589 ctrl |= 0x01; /* Software reset of DMA */
1590 mci_writel(host, BMOD, ctrl);
1595 spin_unlock_bh(&host->lock);
1597 /* Power down slot (after spin_unlock, may sleep) */
1598 if (present == 0 && host->pdata->setpower)
1599 host->pdata->setpower(slot->id, 0);
1601 present = dw_mci_get_cd(mmc);
1604 mmc_detect_change(slot->mmc,
1605 msecs_to_jiffies(host->pdata->detect_delay_ms));
1609 static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
1611 struct mmc_host *mmc;
1612 struct dw_mci_slot *slot;
1614 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), &host->pdev->dev);
1618 slot = mmc_priv(mmc);
1623 mmc->ops = &dw_mci_ops;
1624 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
1625 mmc->f_max = host->bus_hz;
1627 if (host->pdata->get_ocr)
1628 mmc->ocr_avail = host->pdata->get_ocr(id);
1630 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1633 * Start with slot power disabled, it will be enabled when a card
1636 if (host->pdata->setpower)
1637 host->pdata->setpower(id, 0);
1639 if (host->pdata->caps)
1640 mmc->caps = host->pdata->caps;
1644 if (host->pdata->get_bus_wd)
1645 if (host->pdata->get_bus_wd(slot->id) >= 4)
1646 mmc->caps |= MMC_CAP_4_BIT_DATA;
1648 if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
1649 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1651 #ifdef CONFIG_MMC_DW_IDMAC
1652 mmc->max_segs = host->ring_size;
1653 mmc->max_blk_size = 65536;
1654 mmc->max_blk_count = host->ring_size;
1655 mmc->max_seg_size = 0x1000;
1656 mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
1658 if (host->pdata->blk_settings) {
1659 mmc->max_segs = host->pdata->blk_settings->max_segs;
1660 mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
1661 mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
1662 mmc->max_req_size = host->pdata->blk_settings->max_req_size;
1663 mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
1665 /* Useful defaults if platform data is unset. */
1667 mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
1668 mmc->max_blk_count = 512;
1669 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1670 mmc->max_seg_size = mmc->max_req_size;
1672 #endif /* CONFIG_MMC_DW_IDMAC */
1674 host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
1675 if (IS_ERR(host->vmmc)) {
1676 printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
1679 regulator_enable(host->vmmc);
1681 if (dw_mci_get_cd(mmc))
1682 set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1684 clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
1686 host->slot[id] = slot;
1689 #if defined(CONFIG_DEBUG_FS)
1690 dw_mci_init_debugfs(slot);
1693 /* Card initially undetected */
1694 slot->last_detect_state = 0;
1697 * Card may have been plugged in prior to boot so we
1698 * need to run the detect tasklet
1700 queue_work(dw_mci_card_workqueue, &host->card_work);
1705 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
1707 /* Shutdown detect IRQ */
1708 if (slot->host->pdata->exit)
1709 slot->host->pdata->exit(id);
1711 /* Debugfs stuff is cleaned up by mmc core */
1712 mmc_remove_host(slot->mmc);
1713 slot->host->slot[id] = NULL;
1714 mmc_free_host(slot->mmc);
1717 static void dw_mci_init_dma(struct dw_mci *host)
1719 /* Alloc memory for sg translation */
1720 host->sg_cpu = dma_alloc_coherent(&host->pdev->dev, PAGE_SIZE,
1721 &host->sg_dma, GFP_KERNEL);
1722 if (!host->sg_cpu) {
1723 dev_err(&host->pdev->dev, "%s: could not alloc DMA memory\n",
1728 /* Determine which DMA interface to use */
1729 #ifdef CONFIG_MMC_DW_IDMAC
1730 host->dma_ops = &dw_mci_idmac_ops;
1731 dev_info(&host->pdev->dev, "Using internal DMA controller.\n");
1737 if (host->dma_ops->init) {
1738 if (host->dma_ops->init(host)) {
1739 dev_err(&host->pdev->dev, "%s: Unable to initialize "
1740 "DMA Controller.\n", __func__);
1744 dev_err(&host->pdev->dev, "DMA initialization not found.\n");
1752 dev_info(&host->pdev->dev, "Using PIO mode.\n");
1757 static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
1759 unsigned long timeout = jiffies + msecs_to_jiffies(500);
1762 mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1763 SDMMC_CTRL_DMA_RESET));
1765 /* wait till resets clear */
1767 ctrl = mci_readl(host, CTRL);
1768 if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
1769 SDMMC_CTRL_DMA_RESET)))
1771 } while (time_before(jiffies, timeout));
1773 dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
1778 static int dw_mci_probe(struct platform_device *pdev)
1780 struct dw_mci *host;
1781 struct resource *regs;
1782 struct dw_mci_board *pdata;
1783 int irq, ret, i, width;
1786 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1790 irq = platform_get_irq(pdev, 0);
1794 host = kzalloc(sizeof(struct dw_mci), GFP_KERNEL);
1799 host->pdata = pdata = pdev->dev.platform_data;
1800 if (!pdata || !pdata->init) {
1802 "Platform data must supply init function\n");
1807 if (!pdata->select_slot && pdata->num_slots > 1) {
1809 "Platform data must supply select_slot function\n");
1814 if (!pdata->bus_hz) {
1816 "Platform data must supply bus speed\n");
1821 host->bus_hz = pdata->bus_hz;
1822 host->quirks = pdata->quirks;
1824 spin_lock_init(&host->lock);
1825 INIT_LIST_HEAD(&host->queue);
1828 host->regs = ioremap(regs->start, resource_size(regs));
1832 host->dma_ops = pdata->dma_ops;
1833 dw_mci_init_dma(host);
1836 * Get the host data width - this assumes that HCON has been set with
1837 * the correct values.
1839 i = (mci_readl(host, HCON) >> 7) & 0x7;
1841 host->push_data = dw_mci_push_data16;
1842 host->pull_data = dw_mci_pull_data16;
1844 host->data_shift = 1;
1845 } else if (i == 2) {
1846 host->push_data = dw_mci_push_data64;
1847 host->pull_data = dw_mci_pull_data64;
1849 host->data_shift = 3;
1851 /* Check for a reserved value, and warn if it is */
1853 "HCON reports a reserved host data width!\n"
1854 "Defaulting to 32-bit access.\n");
1855 host->push_data = dw_mci_push_data32;
1856 host->pull_data = dw_mci_pull_data32;
1858 host->data_shift = 2;
1861 /* Reset all blocks */
1862 if (!mci_wait_reset(&pdev->dev, host)) {
1867 /* Clear the interrupts for the host controller */
1868 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1869 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
1871 /* Put in max timeout */
1872 mci_writel(host, TMOUT, 0xFFFFFFFF);
1875 * FIFO threshold settings RxMark = fifo_size / 2 - 1,
1876 * Tx Mark = fifo_size / 2 DMA Size = 8
1878 if (!host->pdata->fifo_depth) {
1880 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
1881 * have been overwritten by the bootloader, just like we're
1882 * about to do, so if you know the value for your hardware, you
1883 * should put it in the platform data.
1885 fifo_size = mci_readl(host, FIFOTH);
1886 fifo_size = 1 + ((fifo_size >> 16) & 0x7ff);
1888 fifo_size = host->pdata->fifo_depth;
1890 host->fifo_depth = fifo_size;
1891 host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
1892 ((fifo_size/2) << 0));
1893 mci_writel(host, FIFOTH, host->fifoth_val);
1895 /* disable clock to CIU */
1896 mci_writel(host, CLKENA, 0);
1897 mci_writel(host, CLKSRC, 0);
1899 tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
1900 dw_mci_card_workqueue = alloc_workqueue("dw-mci-card",
1901 WQ_MEM_RECLAIM | WQ_NON_REENTRANT, 1);
1902 if (!dw_mci_card_workqueue)
1904 INIT_WORK(&host->card_work, dw_mci_work_routine_card);
1906 ret = request_irq(irq, dw_mci_interrupt, 0, "dw-mci", host);
1910 platform_set_drvdata(pdev, host);
1912 if (host->pdata->num_slots)
1913 host->num_slots = host->pdata->num_slots;
1915 host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
1917 /* We need at least one slot to succeed */
1918 for (i = 0; i < host->num_slots; i++) {
1919 ret = dw_mci_init_slot(host, i);
1927 * Enable interrupts for command done, data over, data empty, card det,
1928 * receive ready and error such as transmit, receive timeout, crc error
1930 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1931 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
1932 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
1933 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
1934 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
1936 dev_info(&pdev->dev, "DW MMC controller at irq %d, "
1937 "%d bit host data width, "
1939 irq, width, fifo_size);
1940 if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
1941 dev_info(&pdev->dev, "Internal DMAC interrupt fix enabled.\n");
1946 /* De-init any initialized slots */
1949 dw_mci_cleanup_slot(host->slot[i], i);
1952 free_irq(irq, host);
1955 destroy_workqueue(dw_mci_card_workqueue);
1958 if (host->use_dma && host->dma_ops->exit)
1959 host->dma_ops->exit(host);
1960 dma_free_coherent(&host->pdev->dev, PAGE_SIZE,
1961 host->sg_cpu, host->sg_dma);
1962 iounmap(host->regs);
1965 regulator_disable(host->vmmc);
1966 regulator_put(host->vmmc);
1975 static int __exit dw_mci_remove(struct platform_device *pdev)
1977 struct dw_mci *host = platform_get_drvdata(pdev);
1980 mci_writel(host, RINTSTS, 0xFFFFFFFF);
1981 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
1983 platform_set_drvdata(pdev, NULL);
1985 for (i = 0; i < host->num_slots; i++) {
1986 dev_dbg(&pdev->dev, "remove slot %d\n", i);
1988 dw_mci_cleanup_slot(host->slot[i], i);
1991 /* disable clock to CIU */
1992 mci_writel(host, CLKENA, 0);
1993 mci_writel(host, CLKSRC, 0);
1995 free_irq(platform_get_irq(pdev, 0), host);
1996 destroy_workqueue(dw_mci_card_workqueue);
1997 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
1999 if (host->use_dma && host->dma_ops->exit)
2000 host->dma_ops->exit(host);
2003 regulator_disable(host->vmmc);
2004 regulator_put(host->vmmc);
2007 iounmap(host->regs);
2015 * TODO: we should probably disable the clock to the card in the suspend path.
2017 static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
2020 struct dw_mci *host = platform_get_drvdata(pdev);
2022 for (i = 0; i < host->num_slots; i++) {
2023 struct dw_mci_slot *slot = host->slot[i];
2026 ret = mmc_suspend_host(slot->mmc);
2029 slot = host->slot[i];
2031 mmc_resume_host(host->slot[i]->mmc);
2038 regulator_disable(host->vmmc);
2043 static int dw_mci_resume(struct platform_device *pdev)
2046 struct dw_mci *host = platform_get_drvdata(pdev);
2049 regulator_enable(host->vmmc);
2051 if (host->dma_ops->init)
2052 host->dma_ops->init(host);
2054 if (!mci_wait_reset(&pdev->dev, host)) {
2059 /* Restore the old value at FIFOTH register */
2060 mci_writel(host, FIFOTH, host->fifoth_val);
2062 mci_writel(host, RINTSTS, 0xFFFFFFFF);
2063 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
2064 SDMMC_INT_TXDR | SDMMC_INT_RXDR |
2065 DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
2066 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
2068 for (i = 0; i < host->num_slots; i++) {
2069 struct dw_mci_slot *slot = host->slot[i];
2072 ret = mmc_resume_host(host->slot[i]->mmc);
2080 #define dw_mci_suspend NULL
2081 #define dw_mci_resume NULL
2082 #endif /* CONFIG_PM */
2084 static struct platform_driver dw_mci_driver = {
2085 .remove = __exit_p(dw_mci_remove),
2086 .suspend = dw_mci_suspend,
2087 .resume = dw_mci_resume,
2093 static int __init dw_mci_init(void)
2095 return platform_driver_probe(&dw_mci_driver, dw_mci_probe);
2098 static void __exit dw_mci_exit(void)
2100 platform_driver_unregister(&dw_mci_driver);
2103 module_init(dw_mci_init);
2104 module_exit(dw_mci_exit);
2106 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
2107 MODULE_AUTHOR("NXP Semiconductor VietNam");
2108 MODULE_AUTHOR("Imagination Technologies Ltd");
2109 MODULE_LICENSE("GPL v2");