2 * Atmel MultiMedia Card Interface driver
4 * Copyright (C) 2004-2008 Atmel Corporation
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/blkdev.h>
11 #include <linux/clk.h>
12 #include <linux/debugfs.h>
13 #include <linux/device.h>
14 #include <linux/dmaengine.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/err.h>
17 #include <linux/gpio.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/ioport.h>
21 #include <linux/module.h>
23 #include <linux/of_device.h>
24 #include <linux/of_gpio.h>
25 #include <linux/platform_device.h>
26 #include <linux/scatterlist.h>
27 #include <linux/seq_file.h>
28 #include <linux/slab.h>
29 #include <linux/stat.h>
30 #include <linux/types.h>
31 #include <linux/platform_data/atmel.h>
33 #include <linux/mmc/host.h>
34 #include <linux/mmc/sdio.h>
36 #include <mach/atmel-mci.h>
37 #include <linux/atmel-mci.h>
38 #include <linux/atmel_pdc.h>
40 #include <asm/cacheflush.h>
42 #include <asm/unaligned.h>
44 #include "atmel-mci-regs.h"
46 #define ATMCI_DATA_ERROR_FLAGS (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
47 #define ATMCI_DMA_THRESHOLD 16
56 enum atmel_mci_state {
60 STATE_WAITING_NOTBUSY,
75 struct atmel_mci_caps {
76 bool has_dma_conf_reg;
83 bool has_bad_data_ordering;
84 bool need_reset_after_xfer;
85 bool need_blksz_mul_4;
86 bool need_notbusy_for_read_ops;
89 struct atmel_mci_dma {
90 struct dma_chan *chan;
91 struct dma_async_tx_descriptor *data_desc;
95 * struct atmel_mci - MMC controller state shared between all slots
96 * @lock: Spinlock protecting the queue and associated data.
97 * @regs: Pointer to MMIO registers.
98 * @sg: Scatterlist entry currently being processed by PIO or PDC code.
99 * @pio_offset: Offset into the current scatterlist entry.
100 * @buffer: Buffer used if we don't have the r/w proof capability. We
101 * don't have the time to switch pdc buffers so we have to use only
102 * one buffer for the full transaction.
103 * @buf_size: size of the buffer.
104 * @phys_buf_addr: buffer address needed for pdc.
105 * @cur_slot: The slot which is currently using the controller.
106 * @mrq: The request currently being processed on @cur_slot,
107 * or NULL if the controller is idle.
108 * @cmd: The command currently being sent to the card, or NULL.
109 * @data: The data currently being transferred, or NULL if no data
110 * transfer is in progress.
111 * @data_size: just data->blocks * data->blksz.
112 * @dma: DMA client state.
113 * @data_chan: DMA channel being used for the current data transfer.
114 * @cmd_status: Snapshot of SR taken upon completion of the current
115 * command. Only valid when EVENT_CMD_COMPLETE is pending.
116 * @data_status: Snapshot of SR taken upon completion of the current
117 * data transfer. Only valid when EVENT_DATA_COMPLETE or
118 * EVENT_DATA_ERROR is pending.
119 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
121 * @tasklet: Tasklet running the request state machine.
122 * @pending_events: Bitmask of events flagged by the interrupt handler
123 * to be processed by the tasklet.
124 * @completed_events: Bitmask of events which the state machine has
126 * @state: Tasklet state.
127 * @queue: List of slots waiting for access to the controller.
128 * @need_clock_update: Update the clock rate before the next request.
129 * @need_reset: Reset controller before next request.
130 * @timer: Timer to balance the data timeout error flag which cannot rise.
131 * @mode_reg: Value of the MR register.
132 * @cfg_reg: Value of the CFG register.
133 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
134 * rate and timeout calculations.
135 * @mapbase: Physical address of the MMIO registers.
136 * @mck: The peripheral bus clock hooked up to the MMC controller.
137 * @pdev: Platform device associated with the MMC controller.
138 * @slot: Slots sharing this MMC controller.
139 * @caps: MCI capabilities depending on MCI version.
140 * @prepare_data: function to setup MCI before data transfer which
141 * depends on MCI capabilities.
142 * @submit_data: function to start data transfer which depends on MCI
144 * @stop_transfer: function to stop data transfer which depends on MCI
150 * @lock is a softirq-safe spinlock protecting @queue as well as
151 * @cur_slot, @mrq and @state. These must always be updated
152 * at the same time while holding @lock.
154 * @lock also protects mode_reg and need_clock_update since these are
155 * used to synchronize mode register updates with the queue
158 * The @mrq field of struct atmel_mci_slot is also protected by @lock,
159 * and must always be written at the same time as the slot is added to
162 * @pending_events and @completed_events are accessed using atomic bit
163 * operations, so they don't need any locking.
165 * None of the fields touched by the interrupt handler need any
166 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
167 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
168 * interrupts must be disabled and @data_status updated with a
169 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
170 * CMDRDY interrupt must be disabled and @cmd_status updated with a
171 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
172 * bytes_xfered field of @data must be written. This is ensured by
179 struct scatterlist *sg;
181 unsigned int pio_offset;
182 unsigned int *buffer;
183 unsigned int buf_size;
184 dma_addr_t buf_phys_addr;
186 struct atmel_mci_slot *cur_slot;
187 struct mmc_request *mrq;
188 struct mmc_command *cmd;
189 struct mmc_data *data;
190 unsigned int data_size;
192 struct atmel_mci_dma dma;
193 struct dma_chan *data_chan;
194 struct dma_slave_config dma_conf;
200 struct tasklet_struct tasklet;
201 unsigned long pending_events;
202 unsigned long completed_events;
203 enum atmel_mci_state state;
204 struct list_head queue;
206 bool need_clock_update;
208 struct timer_list timer;
211 unsigned long bus_hz;
212 unsigned long mapbase;
214 struct platform_device *pdev;
216 struct atmel_mci_slot *slot[ATMCI_MAX_NR_SLOTS];
218 struct atmel_mci_caps caps;
220 u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
221 void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
222 void (*stop_transfer)(struct atmel_mci *host);
226 * struct atmel_mci_slot - MMC slot state
227 * @mmc: The mmc_host representing this slot.
228 * @host: The MMC controller this slot is using.
229 * @sdc_reg: Value of SDCR to be written before using this slot.
230 * @sdio_irq: SDIO irq mask for this slot.
231 * @mrq: mmc_request currently being processed or waiting to be
232 * processed, or NULL when the slot is idle.
233 * @queue_node: List node for placing this node in the @queue list of
235 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
236 * @flags: Random state bits associated with the slot.
237 * @detect_pin: GPIO pin used for card detection, or negative if not
239 * @wp_pin: GPIO pin used for card write protect sending, or negative
241 * @detect_is_active_high: The state of the detect pin when it is active.
242 * @detect_timer: Timer used for debouncing @detect_pin interrupts.
244 struct atmel_mci_slot {
245 struct mmc_host *mmc;
246 struct atmel_mci *host;
251 struct mmc_request *mrq;
252 struct list_head queue_node;
256 #define ATMCI_CARD_PRESENT 0
257 #define ATMCI_CARD_NEED_INIT 1
258 #define ATMCI_SHUTDOWN 2
262 bool detect_is_active_high;
264 struct timer_list detect_timer;
267 #define atmci_test_and_clear_pending(host, event) \
268 test_and_clear_bit(event, &host->pending_events)
269 #define atmci_set_completed(host, event) \
270 set_bit(event, &host->completed_events)
271 #define atmci_set_pending(host, event) \
272 set_bit(event, &host->pending_events)
275 * The debugfs stuff below is mostly optimized away when
276 * CONFIG_DEBUG_FS is not set.
278 static int atmci_req_show(struct seq_file *s, void *v)
280 struct atmel_mci_slot *slot = s->private;
281 struct mmc_request *mrq;
282 struct mmc_command *cmd;
283 struct mmc_command *stop;
284 struct mmc_data *data;
286 /* Make sure we get a consistent snapshot */
287 spin_lock_bh(&slot->host->lock);
297 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
298 cmd->opcode, cmd->arg, cmd->flags,
299 cmd->resp[0], cmd->resp[1], cmd->resp[2],
300 cmd->resp[3], cmd->error);
302 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
303 data->bytes_xfered, data->blocks,
304 data->blksz, data->flags, data->error);
307 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
308 stop->opcode, stop->arg, stop->flags,
309 stop->resp[0], stop->resp[1], stop->resp[2],
310 stop->resp[3], stop->error);
313 spin_unlock_bh(&slot->host->lock);
318 static int atmci_req_open(struct inode *inode, struct file *file)
320 return single_open(file, atmci_req_show, inode->i_private);
323 static const struct file_operations atmci_req_fops = {
324 .owner = THIS_MODULE,
325 .open = atmci_req_open,
328 .release = single_release,
331 static void atmci_show_status_reg(struct seq_file *s,
332 const char *regname, u32 value)
334 static const char *sr_bit[] = {
365 seq_printf(s, "%s:\t0x%08x", regname, value);
366 for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
367 if (value & (1 << i)) {
369 seq_printf(s, " %s", sr_bit[i]);
371 seq_puts(s, " UNKNOWN");
377 static int atmci_regs_show(struct seq_file *s, void *v)
379 struct atmel_mci *host = s->private;
384 buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
389 * Grab a more or less consistent snapshot. Note that we're
390 * not disabling interrupts, so IMR and SR may not be
393 ret = clk_prepare_enable(host->mck);
397 spin_lock_bh(&host->lock);
398 memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
399 spin_unlock_bh(&host->lock);
401 clk_disable_unprepare(host->mck);
403 seq_printf(s, "MR:\t0x%08x%s%s ",
405 buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
406 buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
407 if (host->caps.has_odd_clk_div)
408 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
409 ((buf[ATMCI_MR / 4] & 0xff) << 1)
410 | ((buf[ATMCI_MR / 4] >> 16) & 1));
412 seq_printf(s, "CLKDIV=%u\n",
413 (buf[ATMCI_MR / 4] & 0xff));
414 seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
415 seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
416 seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
417 seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
419 buf[ATMCI_BLKR / 4] & 0xffff,
420 (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
421 if (host->caps.has_cstor_reg)
422 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
424 /* Don't read RSPR and RDR; it will consume the data there */
426 atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
427 atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
429 if (host->caps.has_dma_conf_reg) {
432 val = buf[ATMCI_DMA / 4];
433 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
436 1 << (((val >> 4) & 3) + 1) : 1,
437 val & ATMCI_DMAEN ? " DMAEN" : "");
439 if (host->caps.has_cfg_reg) {
442 val = buf[ATMCI_CFG / 4];
443 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
445 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
446 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
447 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
448 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
457 static int atmci_regs_open(struct inode *inode, struct file *file)
459 return single_open(file, atmci_regs_show, inode->i_private);
462 static const struct file_operations atmci_regs_fops = {
463 .owner = THIS_MODULE,
464 .open = atmci_regs_open,
467 .release = single_release,
470 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
472 struct mmc_host *mmc = slot->mmc;
473 struct atmel_mci *host = slot->host;
477 root = mmc->debugfs_root;
481 node = debugfs_create_file("regs", S_IRUSR, root, host,
488 node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
492 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
496 node = debugfs_create_x32("pending_events", S_IRUSR, root,
497 (u32 *)&host->pending_events);
501 node = debugfs_create_x32("completed_events", S_IRUSR, root,
502 (u32 *)&host->completed_events);
509 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
512 #if defined(CONFIG_OF)
513 static const struct of_device_id atmci_dt_ids[] = {
514 { .compatible = "atmel,hsmci" },
518 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
520 static struct mci_platform_data*
521 atmci_of_init(struct platform_device *pdev)
523 struct device_node *np = pdev->dev.of_node;
524 struct device_node *cnp;
525 struct mci_platform_data *pdata;
529 dev_err(&pdev->dev, "device node not found\n");
530 return ERR_PTR(-EINVAL);
533 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
535 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
536 return ERR_PTR(-ENOMEM);
539 for_each_child_of_node(np, cnp) {
540 if (of_property_read_u32(cnp, "reg", &slot_id)) {
541 dev_warn(&pdev->dev, "reg property is missing for %s\n",
546 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
547 dev_warn(&pdev->dev, "can't have more than %d slots\n",
552 if (of_property_read_u32(cnp, "bus-width",
553 &pdata->slot[slot_id].bus_width))
554 pdata->slot[slot_id].bus_width = 1;
556 pdata->slot[slot_id].detect_pin =
557 of_get_named_gpio(cnp, "cd-gpios", 0);
559 pdata->slot[slot_id].detect_is_active_high =
560 of_property_read_bool(cnp, "cd-inverted");
562 pdata->slot[slot_id].wp_pin =
563 of_get_named_gpio(cnp, "wp-gpios", 0);
568 #else /* CONFIG_OF */
569 static inline struct mci_platform_data*
570 atmci_of_init(struct platform_device *dev)
572 return ERR_PTR(-EINVAL);
576 static inline unsigned int atmci_get_version(struct atmel_mci *host)
578 return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
581 static void atmci_timeout_timer(unsigned long data)
583 struct atmel_mci *host;
585 host = (struct atmel_mci *)data;
587 dev_dbg(&host->pdev->dev, "software timeout\n");
589 if (host->mrq->cmd->data) {
590 host->mrq->cmd->data->error = -ETIMEDOUT;
593 * With some SDIO modules, sometimes DMA transfer hangs. If
594 * stop_transfer() is not called then the DMA request is not
595 * removed, following ones are queued and never computed.
597 if (host->state == STATE_DATA_XFER)
598 host->stop_transfer(host);
600 host->mrq->cmd->error = -ETIMEDOUT;
603 host->need_reset = 1;
604 host->state = STATE_END_REQUEST;
606 tasklet_schedule(&host->tasklet);
609 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
613 * It is easier here to use us instead of ns for the timeout,
614 * it prevents from overflows during calculation.
616 unsigned int us = DIV_ROUND_UP(ns, 1000);
618 /* Maximum clock frequency is host->bus_hz/2 */
619 return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
622 static void atmci_set_timeout(struct atmel_mci *host,
623 struct atmel_mci_slot *slot, struct mmc_data *data)
625 static unsigned dtomul_to_shift[] = {
626 0, 4, 7, 8, 10, 12, 16, 20
632 timeout = atmci_ns_to_clocks(host, data->timeout_ns)
633 + data->timeout_clks;
635 for (dtomul = 0; dtomul < 8; dtomul++) {
636 unsigned shift = dtomul_to_shift[dtomul];
637 dtocyc = (timeout + (1 << shift) - 1) >> shift;
647 dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
648 dtocyc << dtomul_to_shift[dtomul]);
649 atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
653 * Return mask with command flags to be enabled for this command.
655 static u32 atmci_prepare_command(struct mmc_host *mmc,
656 struct mmc_command *cmd)
658 struct mmc_data *data;
661 cmd->error = -EINPROGRESS;
663 cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
665 if (cmd->flags & MMC_RSP_PRESENT) {
666 if (cmd->flags & MMC_RSP_136)
667 cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
669 cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
673 * This should really be MAXLAT_5 for CMD2 and ACMD41, but
674 * it's too difficult to determine whether this is an ACMD or
675 * not. Better make it 64.
677 cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
679 if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
680 cmdr |= ATMCI_CMDR_OPDCMD;
684 cmdr |= ATMCI_CMDR_START_XFER;
686 if (cmd->opcode == SD_IO_RW_EXTENDED) {
687 cmdr |= ATMCI_CMDR_SDIO_BLOCK;
689 if (data->flags & MMC_DATA_STREAM)
690 cmdr |= ATMCI_CMDR_STREAM;
691 else if (data->blocks > 1)
692 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
694 cmdr |= ATMCI_CMDR_BLOCK;
697 if (data->flags & MMC_DATA_READ)
698 cmdr |= ATMCI_CMDR_TRDIR_READ;
704 static void atmci_send_command(struct atmel_mci *host,
705 struct mmc_command *cmd, u32 cmd_flags)
710 dev_vdbg(&host->pdev->dev,
711 "start command: ARGR=0x%08x CMDR=0x%08x\n",
712 cmd->arg, cmd_flags);
714 atmci_writel(host, ATMCI_ARGR, cmd->arg);
715 atmci_writel(host, ATMCI_CMDR, cmd_flags);
718 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
720 dev_dbg(&host->pdev->dev, "send stop command\n");
721 atmci_send_command(host, data->stop, host->stop_cmdr);
722 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
726 * Configure given PDC buffer taking care of alignement issues.
727 * Update host->data_size and host->sg.
729 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
730 enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
732 u32 pointer_reg, counter_reg;
733 unsigned int buf_size;
735 if (dir == XFER_RECEIVE) {
736 pointer_reg = ATMEL_PDC_RPR;
737 counter_reg = ATMEL_PDC_RCR;
739 pointer_reg = ATMEL_PDC_TPR;
740 counter_reg = ATMEL_PDC_TCR;
743 if (buf_nb == PDC_SECOND_BUF) {
744 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
745 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
748 if (!host->caps.has_rwproof) {
749 buf_size = host->buf_size;
750 atmci_writel(host, pointer_reg, host->buf_phys_addr);
752 buf_size = sg_dma_len(host->sg);
753 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
756 if (host->data_size <= buf_size) {
757 if (host->data_size & 0x3) {
758 /* If size is different from modulo 4, transfer bytes */
759 atmci_writel(host, counter_reg, host->data_size);
760 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
762 /* Else transfer 32-bits words */
763 atmci_writel(host, counter_reg, host->data_size / 4);
767 /* We assume the size of a page is 32-bits aligned */
768 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
769 host->data_size -= sg_dma_len(host->sg);
771 host->sg = sg_next(host->sg);
776 * Configure PDC buffer according to the data size ie configuring one or two
777 * buffers. Don't use this function if you want to configure only the second
778 * buffer. In this case, use atmci_pdc_set_single_buf.
780 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
782 atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
784 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
788 * Unmap sg lists, called when transfer is finished.
790 static void atmci_pdc_cleanup(struct atmel_mci *host)
792 struct mmc_data *data = host->data;
795 dma_unmap_sg(&host->pdev->dev,
796 data->sg, data->sg_len,
797 ((data->flags & MMC_DATA_WRITE)
798 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
802 * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
803 * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
804 * interrupt needed for both transfer directions.
806 static void atmci_pdc_complete(struct atmel_mci *host)
808 int transfer_size = host->data->blocks * host->data->blksz;
811 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
813 if ((!host->caps.has_rwproof)
814 && (host->data->flags & MMC_DATA_READ)) {
815 if (host->caps.has_bad_data_ordering)
816 for (i = 0; i < transfer_size; i++)
817 host->buffer[i] = swab32(host->buffer[i]);
818 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
819 host->buffer, transfer_size);
822 atmci_pdc_cleanup(host);
824 dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
825 atmci_set_pending(host, EVENT_XFER_COMPLETE);
826 tasklet_schedule(&host->tasklet);
829 static void atmci_dma_cleanup(struct atmel_mci *host)
831 struct mmc_data *data = host->data;
834 dma_unmap_sg(host->dma.chan->device->dev,
835 data->sg, data->sg_len,
836 ((data->flags & MMC_DATA_WRITE)
837 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
841 * This function is called by the DMA driver from tasklet context.
843 static void atmci_dma_complete(void *arg)
845 struct atmel_mci *host = arg;
846 struct mmc_data *data = host->data;
848 dev_vdbg(&host->pdev->dev, "DMA complete\n");
850 if (host->caps.has_dma_conf_reg)
851 /* Disable DMA hardware handshaking on MCI */
852 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
854 atmci_dma_cleanup(host);
857 * If the card was removed, data will be NULL. No point trying
858 * to send the stop command or waiting for NBUSY in this case.
861 dev_dbg(&host->pdev->dev,
862 "(%s) set pending xfer complete\n", __func__);
863 atmci_set_pending(host, EVENT_XFER_COMPLETE);
864 tasklet_schedule(&host->tasklet);
867 * Regardless of what the documentation says, we have
868 * to wait for NOTBUSY even after block read
871 * When the DMA transfer is complete, the controller
872 * may still be reading the CRC from the card, i.e.
873 * the data transfer is still in progress and we
874 * haven't seen all the potential error bits yet.
876 * The interrupt handler will schedule a different
877 * tasklet to finish things up when the data transfer
878 * is completely done.
880 * We may not complete the mmc request here anyway
881 * because the mmc layer may call back and cause us to
882 * violate the "don't submit new operations from the
883 * completion callback" rule of the dma engine
886 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
891 * Returns a mask of interrupt flags to be enabled after the whole
892 * request has been prepared.
894 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
898 data->error = -EINPROGRESS;
901 host->sg_len = data->sg_len;
903 host->data_chan = NULL;
905 iflags = ATMCI_DATA_ERROR_FLAGS;
908 * Errata: MMC data write operation with less than 12
909 * bytes is impossible.
911 * Errata: MCI Transmit Data Register (TDR) FIFO
912 * corruption when length is not multiple of 4.
914 if (data->blocks * data->blksz < 12
915 || (data->blocks * data->blksz) & 3)
916 host->need_reset = true;
918 host->pio_offset = 0;
919 if (data->flags & MMC_DATA_READ)
920 iflags |= ATMCI_RXRDY;
922 iflags |= ATMCI_TXRDY;
928 * Set interrupt flags and set block length into the MCI mode register even
929 * if this value is also accessible in the MCI block register. It seems to be
930 * necessary before the High Speed MCI version. It also map sg and configure
934 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
938 enum dma_data_direction dir;
941 data->error = -EINPROGRESS;
945 iflags = ATMCI_DATA_ERROR_FLAGS;
947 /* Enable pdc mode */
948 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
950 if (data->flags & MMC_DATA_READ) {
951 dir = DMA_FROM_DEVICE;
952 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
955 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
959 tmp = atmci_readl(host, ATMCI_MR);
961 tmp |= ATMCI_BLKLEN(data->blksz);
962 atmci_writel(host, ATMCI_MR, tmp);
965 host->data_size = data->blocks * data->blksz;
966 sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
968 if ((!host->caps.has_rwproof)
969 && (host->data->flags & MMC_DATA_WRITE)) {
970 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
971 host->buffer, host->data_size);
972 if (host->caps.has_bad_data_ordering)
973 for (i = 0; i < host->data_size; i++)
974 host->buffer[i] = swab32(host->buffer[i]);
978 atmci_pdc_set_both_buf(host,
979 ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
985 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
987 struct dma_chan *chan;
988 struct dma_async_tx_descriptor *desc;
989 struct scatterlist *sg;
991 enum dma_data_direction direction;
992 enum dma_transfer_direction slave_dirn;
997 data->error = -EINPROGRESS;
1003 iflags = ATMCI_DATA_ERROR_FLAGS;
1006 * We don't do DMA on "complex" transfers, i.e. with
1007 * non-word-aligned buffers or lengths. Also, we don't bother
1008 * with all the DMA setup overhead for short transfers.
1010 if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1011 return atmci_prepare_data(host, data);
1012 if (data->blksz & 3)
1013 return atmci_prepare_data(host, data);
1015 for_each_sg(data->sg, sg, data->sg_len, i) {
1016 if (sg->offset & 3 || sg->length & 3)
1017 return atmci_prepare_data(host, data);
1020 /* If we don't have a channel, we can't do DMA */
1021 chan = host->dma.chan;
1023 host->data_chan = chan;
1028 if (data->flags & MMC_DATA_READ) {
1029 direction = DMA_FROM_DEVICE;
1030 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1031 maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
1033 direction = DMA_TO_DEVICE;
1034 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1035 maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
1038 if (host->caps.has_dma_conf_reg)
1039 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1042 sglen = dma_map_sg(chan->device->dev, data->sg,
1043 data->sg_len, direction);
1045 dmaengine_slave_config(chan, &host->dma_conf);
1046 desc = dmaengine_prep_slave_sg(chan,
1047 data->sg, sglen, slave_dirn,
1048 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1052 host->dma.data_desc = desc;
1053 desc->callback = atmci_dma_complete;
1054 desc->callback_param = host;
1058 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1063 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1069 * Start PDC according to transfer direction.
1072 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1074 if (data->flags & MMC_DATA_READ)
1075 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1077 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1081 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1083 struct dma_chan *chan = host->data_chan;
1084 struct dma_async_tx_descriptor *desc = host->dma.data_desc;
1087 dmaengine_submit(desc);
1088 dma_async_issue_pending(chan);
1092 static void atmci_stop_transfer(struct atmel_mci *host)
1094 dev_dbg(&host->pdev->dev,
1095 "(%s) set pending xfer complete\n", __func__);
1096 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1097 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1101 * Stop data transfer because error(s) occurred.
1103 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1105 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1108 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1110 struct dma_chan *chan = host->data_chan;
1113 dmaengine_terminate_all(chan);
1114 atmci_dma_cleanup(host);
1116 /* Data transfer was stopped by the interrupt handler */
1117 dev_dbg(&host->pdev->dev,
1118 "(%s) set pending xfer complete\n", __func__);
1119 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1120 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1125 * Start a request: prepare data if needed, prepare the command and activate
1128 static void atmci_start_request(struct atmel_mci *host,
1129 struct atmel_mci_slot *slot)
1131 struct mmc_request *mrq;
1132 struct mmc_command *cmd;
1133 struct mmc_data *data;
1138 host->cur_slot = slot;
1141 host->pending_events = 0;
1142 host->completed_events = 0;
1143 host->cmd_status = 0;
1144 host->data_status = 0;
1146 dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1148 if (host->need_reset || host->caps.need_reset_after_xfer) {
1149 iflags = atmci_readl(host, ATMCI_IMR);
1150 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1151 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1152 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1153 atmci_writel(host, ATMCI_MR, host->mode_reg);
1154 if (host->caps.has_cfg_reg)
1155 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1156 atmci_writel(host, ATMCI_IER, iflags);
1157 host->need_reset = false;
1159 atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1161 iflags = atmci_readl(host, ATMCI_IMR);
1162 if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1163 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1166 if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1167 /* Send init sequence (74 clock cycles) */
1168 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1169 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1175 atmci_set_timeout(host, slot, data);
1177 /* Must set block count/size before sending command */
1178 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1179 | ATMCI_BLKLEN(data->blksz));
1180 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1181 ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1183 iflags |= host->prepare_data(host, data);
1186 iflags |= ATMCI_CMDRDY;
1188 cmdflags = atmci_prepare_command(slot->mmc, cmd);
1191 * DMA transfer should be started before sending the command to avoid
1192 * unexpected errors especially for read operations in SDIO mode.
1193 * Unfortunately, in PDC mode, command has to be sent before starting
1196 if (host->submit_data != &atmci_submit_data_dma)
1197 atmci_send_command(host, cmd, cmdflags);
1200 host->submit_data(host, data);
1202 if (host->submit_data == &atmci_submit_data_dma)
1203 atmci_send_command(host, cmd, cmdflags);
1206 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1207 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1208 if (!(data->flags & MMC_DATA_WRITE))
1209 host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1210 if (data->flags & MMC_DATA_STREAM)
1211 host->stop_cmdr |= ATMCI_CMDR_STREAM;
1213 host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1217 * We could have enabled interrupts earlier, but I suspect
1218 * that would open up a nice can of interesting race
1219 * conditions (e.g. command and data complete, but stop not
1222 atmci_writel(host, ATMCI_IER, iflags);
1224 mod_timer(&host->timer, jiffies + msecs_to_jiffies(2000));
1227 static void atmci_queue_request(struct atmel_mci *host,
1228 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1230 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1233 spin_lock_bh(&host->lock);
1235 if (host->state == STATE_IDLE) {
1236 host->state = STATE_SENDING_CMD;
1237 atmci_start_request(host, slot);
1239 dev_dbg(&host->pdev->dev, "queue request\n");
1240 list_add_tail(&slot->queue_node, &host->queue);
1242 spin_unlock_bh(&host->lock);
1245 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1247 struct atmel_mci_slot *slot = mmc_priv(mmc);
1248 struct atmel_mci *host = slot->host;
1249 struct mmc_data *data;
1252 dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1255 * We may "know" the card is gone even though there's still an
1256 * electrical connection. If so, we really need to communicate
1257 * this to the MMC core since there won't be any more
1258 * interrupts as the card is completely removed. Otherwise,
1259 * the MMC core might believe the card is still there even
1260 * though the card was just removed very slowly.
1262 if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1263 mrq->cmd->error = -ENOMEDIUM;
1264 mmc_request_done(mmc, mrq);
1268 /* We don't support multiple blocks of weird lengths. */
1270 if (data && data->blocks > 1 && data->blksz & 3) {
1271 mrq->cmd->error = -EINVAL;
1272 mmc_request_done(mmc, mrq);
1275 atmci_queue_request(host, slot, mrq);
1278 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1280 struct atmel_mci_slot *slot = mmc_priv(mmc);
1281 struct atmel_mci *host = slot->host;
1285 slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1286 switch (ios->bus_width) {
1287 case MMC_BUS_WIDTH_1:
1288 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1290 case MMC_BUS_WIDTH_4:
1291 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1296 unsigned int clock_min = ~0U;
1299 clk_prepare(host->mck);
1300 unprepare_clk = true;
1302 spin_lock_bh(&host->lock);
1303 if (!host->mode_reg) {
1304 clk_enable(host->mck);
1305 unprepare_clk = false;
1306 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1307 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1308 if (host->caps.has_cfg_reg)
1309 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1313 * Use mirror of ios->clock to prevent race with mmc
1314 * core ios update when finding the minimum.
1316 slot->clock = ios->clock;
1317 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1318 if (host->slot[i] && host->slot[i]->clock
1319 && host->slot[i]->clock < clock_min)
1320 clock_min = host->slot[i]->clock;
1323 /* Calculate clock divider */
1324 if (host->caps.has_odd_clk_div) {
1325 clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1327 dev_warn(&mmc->class_dev,
1328 "clock %u too slow; using %lu\n",
1329 clock_min, host->bus_hz / (511 + 2));
1332 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1333 | ATMCI_MR_CLKODD(clkdiv & 1);
1335 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1337 dev_warn(&mmc->class_dev,
1338 "clock %u too slow; using %lu\n",
1339 clock_min, host->bus_hz / (2 * 256));
1342 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1346 * WRPROOF and RDPROOF prevent overruns/underruns by
1347 * stopping the clock when the FIFO is full/empty.
1348 * This state is not expected to last for long.
1350 if (host->caps.has_rwproof)
1351 host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1353 if (host->caps.has_cfg_reg) {
1354 /* setup High Speed mode in relation with card capacity */
1355 if (ios->timing == MMC_TIMING_SD_HS)
1356 host->cfg_reg |= ATMCI_CFG_HSMODE;
1358 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1361 if (list_empty(&host->queue)) {
1362 atmci_writel(host, ATMCI_MR, host->mode_reg);
1363 if (host->caps.has_cfg_reg)
1364 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1366 host->need_clock_update = true;
1369 spin_unlock_bh(&host->lock);
1371 bool any_slot_active = false;
1373 unprepare_clk = false;
1375 spin_lock_bh(&host->lock);
1377 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1378 if (host->slot[i] && host->slot[i]->clock) {
1379 any_slot_active = true;
1383 if (!any_slot_active) {
1384 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1385 if (host->mode_reg) {
1386 atmci_readl(host, ATMCI_MR);
1387 clk_disable(host->mck);
1388 unprepare_clk = true;
1392 spin_unlock_bh(&host->lock);
1396 clk_unprepare(host->mck);
1398 switch (ios->power_mode) {
1400 if (!IS_ERR(mmc->supply.vmmc))
1401 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1404 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1405 if (!IS_ERR(mmc->supply.vmmc))
1406 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1410 * TODO: None of the currently available AVR32-based
1411 * boards allow MMC power to be turned off. Implement
1412 * power control when this can be tested properly.
1414 * We also need to hook this into the clock management
1415 * somehow so that newly inserted cards aren't
1416 * subjected to a fast clock before we have a chance
1417 * to figure out what the maximum rate is. Currently,
1418 * there's no way to avoid this, and there never will
1419 * be for boards that don't support power control.
1425 static int atmci_get_ro(struct mmc_host *mmc)
1427 int read_only = -ENOSYS;
1428 struct atmel_mci_slot *slot = mmc_priv(mmc);
1430 if (gpio_is_valid(slot->wp_pin)) {
1431 read_only = gpio_get_value(slot->wp_pin);
1432 dev_dbg(&mmc->class_dev, "card is %s\n",
1433 read_only ? "read-only" : "read-write");
1439 static int atmci_get_cd(struct mmc_host *mmc)
1441 int present = -ENOSYS;
1442 struct atmel_mci_slot *slot = mmc_priv(mmc);
1444 if (gpio_is_valid(slot->detect_pin)) {
1445 present = !(gpio_get_value(slot->detect_pin) ^
1446 slot->detect_is_active_high);
1447 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1448 present ? "" : "not ");
1454 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1456 struct atmel_mci_slot *slot = mmc_priv(mmc);
1457 struct atmel_mci *host = slot->host;
1460 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1462 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1465 static const struct mmc_host_ops atmci_ops = {
1466 .request = atmci_request,
1467 .set_ios = atmci_set_ios,
1468 .get_ro = atmci_get_ro,
1469 .get_cd = atmci_get_cd,
1470 .enable_sdio_irq = atmci_enable_sdio_irq,
1473 /* Called with host->lock held */
1474 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1475 __releases(&host->lock)
1476 __acquires(&host->lock)
1478 struct atmel_mci_slot *slot = NULL;
1479 struct mmc_host *prev_mmc = host->cur_slot->mmc;
1481 WARN_ON(host->cmd || host->data);
1484 * Update the MMC clock rate if necessary. This may be
1485 * necessary if set_ios() is called when a different slot is
1486 * busy transferring data.
1488 if (host->need_clock_update) {
1489 atmci_writel(host, ATMCI_MR, host->mode_reg);
1490 if (host->caps.has_cfg_reg)
1491 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1494 host->cur_slot->mrq = NULL;
1496 if (!list_empty(&host->queue)) {
1497 slot = list_entry(host->queue.next,
1498 struct atmel_mci_slot, queue_node);
1499 list_del(&slot->queue_node);
1500 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1501 mmc_hostname(slot->mmc));
1502 host->state = STATE_SENDING_CMD;
1503 atmci_start_request(host, slot);
1505 dev_vdbg(&host->pdev->dev, "list empty\n");
1506 host->state = STATE_IDLE;
1509 del_timer(&host->timer);
1511 spin_unlock(&host->lock);
1512 mmc_request_done(prev_mmc, mrq);
1513 spin_lock(&host->lock);
1516 static void atmci_command_complete(struct atmel_mci *host,
1517 struct mmc_command *cmd)
1519 u32 status = host->cmd_status;
1521 /* Read the response from the card (up to 16 bytes) */
1522 cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1523 cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1524 cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1525 cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1527 if (status & ATMCI_RTOE)
1528 cmd->error = -ETIMEDOUT;
1529 else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1530 cmd->error = -EILSEQ;
1531 else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1533 else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1534 if (host->caps.need_blksz_mul_4) {
1535 cmd->error = -EINVAL;
1536 host->need_reset = 1;
1542 static void atmci_detect_change(unsigned long data)
1544 struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data;
1549 * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1550 * freeing the interrupt. We must not re-enable the interrupt
1551 * if it has been freed, and if we're shutting down, it
1552 * doesn't really matter whether the card is present or not.
1555 if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1558 enable_irq(gpio_to_irq(slot->detect_pin));
1559 present = !(gpio_get_value(slot->detect_pin) ^
1560 slot->detect_is_active_high);
1561 present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1563 dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1564 present, present_old);
1566 if (present != present_old) {
1567 struct atmel_mci *host = slot->host;
1568 struct mmc_request *mrq;
1570 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1571 present ? "inserted" : "removed");
1573 spin_lock(&host->lock);
1576 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1578 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1580 /* Clean up queue if present */
1583 if (mrq == host->mrq) {
1585 * Reset controller to terminate any ongoing
1586 * commands or data transfers.
1588 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1589 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1590 atmci_writel(host, ATMCI_MR, host->mode_reg);
1591 if (host->caps.has_cfg_reg)
1592 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1597 switch (host->state) {
1600 case STATE_SENDING_CMD:
1601 mrq->cmd->error = -ENOMEDIUM;
1603 host->stop_transfer(host);
1605 case STATE_DATA_XFER:
1606 mrq->data->error = -ENOMEDIUM;
1607 host->stop_transfer(host);
1609 case STATE_WAITING_NOTBUSY:
1610 mrq->data->error = -ENOMEDIUM;
1612 case STATE_SENDING_STOP:
1613 mrq->stop->error = -ENOMEDIUM;
1615 case STATE_END_REQUEST:
1619 atmci_request_end(host, mrq);
1621 list_del(&slot->queue_node);
1622 mrq->cmd->error = -ENOMEDIUM;
1624 mrq->data->error = -ENOMEDIUM;
1626 mrq->stop->error = -ENOMEDIUM;
1628 spin_unlock(&host->lock);
1629 mmc_request_done(slot->mmc, mrq);
1630 spin_lock(&host->lock);
1633 spin_unlock(&host->lock);
1635 mmc_detect_change(slot->mmc, 0);
1639 static void atmci_tasklet_func(unsigned long priv)
1641 struct atmel_mci *host = (struct atmel_mci *)priv;
1642 struct mmc_request *mrq = host->mrq;
1643 struct mmc_data *data = host->data;
1644 enum atmel_mci_state state = host->state;
1645 enum atmel_mci_state prev_state;
1648 spin_lock(&host->lock);
1650 state = host->state;
1652 dev_vdbg(&host->pdev->dev,
1653 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1654 state, host->pending_events, host->completed_events,
1655 atmci_readl(host, ATMCI_IMR));
1659 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1665 case STATE_SENDING_CMD:
1667 * Command has been sent, we are waiting for command
1668 * ready. Then we have three next states possible:
1669 * END_REQUEST by default, WAITING_NOTBUSY if it's a
1670 * command needing it or DATA_XFER if there is data.
1672 dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1673 if (!atmci_test_and_clear_pending(host,
1677 dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1679 atmci_set_completed(host, EVENT_CMD_RDY);
1680 atmci_command_complete(host, mrq->cmd);
1682 dev_dbg(&host->pdev->dev,
1683 "command with data transfer");
1685 * If there is a command error don't start
1688 if (mrq->cmd->error) {
1689 host->stop_transfer(host);
1691 atmci_writel(host, ATMCI_IDR,
1692 ATMCI_TXRDY | ATMCI_RXRDY
1693 | ATMCI_DATA_ERROR_FLAGS);
1694 state = STATE_END_REQUEST;
1696 state = STATE_DATA_XFER;
1697 } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1698 dev_dbg(&host->pdev->dev,
1699 "command response need waiting notbusy");
1700 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1701 state = STATE_WAITING_NOTBUSY;
1703 state = STATE_END_REQUEST;
1707 case STATE_DATA_XFER:
1708 if (atmci_test_and_clear_pending(host,
1709 EVENT_DATA_ERROR)) {
1710 dev_dbg(&host->pdev->dev, "set completed data error\n");
1711 atmci_set_completed(host, EVENT_DATA_ERROR);
1712 state = STATE_END_REQUEST;
1717 * A data transfer is in progress. The event expected
1718 * to move to the next state depends of data transfer
1719 * type (PDC or DMA). Once transfer done we can move
1720 * to the next step which is WAITING_NOTBUSY in write
1721 * case and directly SENDING_STOP in read case.
1723 dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1724 if (!atmci_test_and_clear_pending(host,
1725 EVENT_XFER_COMPLETE))
1728 dev_dbg(&host->pdev->dev,
1729 "(%s) set completed xfer complete\n",
1731 atmci_set_completed(host, EVENT_XFER_COMPLETE);
1733 if (host->caps.need_notbusy_for_read_ops ||
1734 (host->data->flags & MMC_DATA_WRITE)) {
1735 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1736 state = STATE_WAITING_NOTBUSY;
1737 } else if (host->mrq->stop) {
1738 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1739 atmci_send_stop_cmd(host, data);
1740 state = STATE_SENDING_STOP;
1743 data->bytes_xfered = data->blocks * data->blksz;
1745 state = STATE_END_REQUEST;
1749 case STATE_WAITING_NOTBUSY:
1751 * We can be in the state for two reasons: a command
1752 * requiring waiting not busy signal (stop command
1753 * included) or a write operation. In the latest case,
1754 * we need to send a stop command.
1756 dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1757 if (!atmci_test_and_clear_pending(host,
1761 dev_dbg(&host->pdev->dev, "set completed not busy\n");
1762 atmci_set_completed(host, EVENT_NOTBUSY);
1766 * For some commands such as CMD53, even if
1767 * there is data transfer, there is no stop
1770 if (host->mrq->stop) {
1771 atmci_writel(host, ATMCI_IER,
1773 atmci_send_stop_cmd(host, data);
1774 state = STATE_SENDING_STOP;
1777 data->bytes_xfered = data->blocks
1780 state = STATE_END_REQUEST;
1783 state = STATE_END_REQUEST;
1786 case STATE_SENDING_STOP:
1788 * In this state, it is important to set host->data to
1789 * NULL (which is tested in the waiting notbusy state)
1790 * in order to go to the end request state instead of
1791 * sending stop again.
1793 dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1794 if (!atmci_test_and_clear_pending(host,
1798 dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1800 data->bytes_xfered = data->blocks * data->blksz;
1802 atmci_command_complete(host, mrq->stop);
1803 if (mrq->stop->error) {
1804 host->stop_transfer(host);
1805 atmci_writel(host, ATMCI_IDR,
1806 ATMCI_TXRDY | ATMCI_RXRDY
1807 | ATMCI_DATA_ERROR_FLAGS);
1808 state = STATE_END_REQUEST;
1810 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1811 state = STATE_WAITING_NOTBUSY;
1816 case STATE_END_REQUEST:
1817 atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1818 | ATMCI_DATA_ERROR_FLAGS);
1819 status = host->data_status;
1820 if (unlikely(status)) {
1821 host->stop_transfer(host);
1824 if (status & ATMCI_DTOE) {
1825 data->error = -ETIMEDOUT;
1826 } else if (status & ATMCI_DCRCE) {
1827 data->error = -EILSEQ;
1834 atmci_request_end(host, host->mrq);
1838 } while (state != prev_state);
1840 host->state = state;
1842 spin_unlock(&host->lock);
1845 static void atmci_read_data_pio(struct atmel_mci *host)
1847 struct scatterlist *sg = host->sg;
1848 void *buf = sg_virt(sg);
1849 unsigned int offset = host->pio_offset;
1850 struct mmc_data *data = host->data;
1853 unsigned int nbytes = 0;
1856 value = atmci_readl(host, ATMCI_RDR);
1857 if (likely(offset + 4 <= sg->length)) {
1858 put_unaligned(value, (u32 *)(buf + offset));
1863 if (offset == sg->length) {
1864 flush_dcache_page(sg_page(sg));
1865 host->sg = sg = sg_next(sg);
1867 if (!sg || !host->sg_len)
1874 unsigned int remaining = sg->length - offset;
1875 memcpy(buf + offset, &value, remaining);
1876 nbytes += remaining;
1878 flush_dcache_page(sg_page(sg));
1879 host->sg = sg = sg_next(sg);
1881 if (!sg || !host->sg_len)
1884 offset = 4 - remaining;
1886 memcpy(buf, (u8 *)&value + remaining, offset);
1890 status = atmci_readl(host, ATMCI_SR);
1891 if (status & ATMCI_DATA_ERROR_FLAGS) {
1892 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1893 | ATMCI_DATA_ERROR_FLAGS));
1894 host->data_status = status;
1895 data->bytes_xfered += nbytes;
1898 } while (status & ATMCI_RXRDY);
1900 host->pio_offset = offset;
1901 data->bytes_xfered += nbytes;
1906 atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1907 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1908 data->bytes_xfered += nbytes;
1910 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1913 static void atmci_write_data_pio(struct atmel_mci *host)
1915 struct scatterlist *sg = host->sg;
1916 void *buf = sg_virt(sg);
1917 unsigned int offset = host->pio_offset;
1918 struct mmc_data *data = host->data;
1921 unsigned int nbytes = 0;
1924 if (likely(offset + 4 <= sg->length)) {
1925 value = get_unaligned((u32 *)(buf + offset));
1926 atmci_writel(host, ATMCI_TDR, value);
1930 if (offset == sg->length) {
1931 host->sg = sg = sg_next(sg);
1933 if (!sg || !host->sg_len)
1940 unsigned int remaining = sg->length - offset;
1943 memcpy(&value, buf + offset, remaining);
1944 nbytes += remaining;
1946 host->sg = sg = sg_next(sg);
1948 if (!sg || !host->sg_len) {
1949 atmci_writel(host, ATMCI_TDR, value);
1953 offset = 4 - remaining;
1955 memcpy((u8 *)&value + remaining, buf, offset);
1956 atmci_writel(host, ATMCI_TDR, value);
1960 status = atmci_readl(host, ATMCI_SR);
1961 if (status & ATMCI_DATA_ERROR_FLAGS) {
1962 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1963 | ATMCI_DATA_ERROR_FLAGS));
1964 host->data_status = status;
1965 data->bytes_xfered += nbytes;
1968 } while (status & ATMCI_TXRDY);
1970 host->pio_offset = offset;
1971 data->bytes_xfered += nbytes;
1976 atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1977 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1978 data->bytes_xfered += nbytes;
1980 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1983 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1987 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1988 struct atmel_mci_slot *slot = host->slot[i];
1989 if (slot && (status & slot->sdio_irq)) {
1990 mmc_signal_sdio_irq(slot->mmc);
1996 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1998 struct atmel_mci *host = dev_id;
1999 u32 status, mask, pending;
2000 unsigned int pass_count = 0;
2003 status = atmci_readl(host, ATMCI_SR);
2004 mask = atmci_readl(host, ATMCI_IMR);
2005 pending = status & mask;
2009 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2010 dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2011 atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2012 | ATMCI_RXRDY | ATMCI_TXRDY
2013 | ATMCI_ENDRX | ATMCI_ENDTX
2014 | ATMCI_RXBUFF | ATMCI_TXBUFE);
2016 host->data_status = status;
2017 dev_dbg(&host->pdev->dev, "set pending data error\n");
2019 atmci_set_pending(host, EVENT_DATA_ERROR);
2020 tasklet_schedule(&host->tasklet);
2023 if (pending & ATMCI_TXBUFE) {
2024 dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2025 atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2026 atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2028 * We can receive this interruption before having configured
2029 * the second pdc buffer, so we need to reconfigure first and
2030 * second buffers again
2032 if (host->data_size) {
2033 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2034 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2035 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2037 atmci_pdc_complete(host);
2039 } else if (pending & ATMCI_ENDTX) {
2040 dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2041 atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2043 if (host->data_size) {
2044 atmci_pdc_set_single_buf(host,
2045 XFER_TRANSMIT, PDC_SECOND_BUF);
2046 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2050 if (pending & ATMCI_RXBUFF) {
2051 dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2052 atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2053 atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2055 * We can receive this interruption before having configured
2056 * the second pdc buffer, so we need to reconfigure first and
2057 * second buffers again
2059 if (host->data_size) {
2060 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2061 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2062 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2064 atmci_pdc_complete(host);
2066 } else if (pending & ATMCI_ENDRX) {
2067 dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2068 atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2070 if (host->data_size) {
2071 atmci_pdc_set_single_buf(host,
2072 XFER_RECEIVE, PDC_SECOND_BUF);
2073 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2078 * First mci IPs, so mainly the ones having pdc, have some
2079 * issues with the notbusy signal. You can't get it after
2080 * data transmission if you have not sent a stop command.
2081 * The appropriate workaround is to use the BLKE signal.
2083 if (pending & ATMCI_BLKE) {
2084 dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2085 atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2087 dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2088 atmci_set_pending(host, EVENT_NOTBUSY);
2089 tasklet_schedule(&host->tasklet);
2092 if (pending & ATMCI_NOTBUSY) {
2093 dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2094 atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2096 dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2097 atmci_set_pending(host, EVENT_NOTBUSY);
2098 tasklet_schedule(&host->tasklet);
2101 if (pending & ATMCI_RXRDY)
2102 atmci_read_data_pio(host);
2103 if (pending & ATMCI_TXRDY)
2104 atmci_write_data_pio(host);
2106 if (pending & ATMCI_CMDRDY) {
2107 dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2108 atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2109 host->cmd_status = status;
2111 dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2112 atmci_set_pending(host, EVENT_CMD_RDY);
2113 tasklet_schedule(&host->tasklet);
2116 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2117 atmci_sdio_interrupt(host, status);
2119 } while (pass_count++ < 5);
2121 return pass_count ? IRQ_HANDLED : IRQ_NONE;
2124 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2126 struct atmel_mci_slot *slot = dev_id;
2129 * Disable interrupts until the pin has stabilized and check
2130 * the state then. Use mod_timer() since we may be in the
2131 * middle of the timer routine when this interrupt triggers.
2133 disable_irq_nosync(irq);
2134 mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2139 static int __init atmci_init_slot(struct atmel_mci *host,
2140 struct mci_slot_pdata *slot_data, unsigned int id,
2141 u32 sdc_reg, u32 sdio_irq)
2143 struct mmc_host *mmc;
2144 struct atmel_mci_slot *slot;
2146 mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2150 slot = mmc_priv(mmc);
2153 slot->detect_pin = slot_data->detect_pin;
2154 slot->wp_pin = slot_data->wp_pin;
2155 slot->detect_is_active_high = slot_data->detect_is_active_high;
2156 slot->sdc_reg = sdc_reg;
2157 slot->sdio_irq = sdio_irq;
2159 dev_dbg(&mmc->class_dev,
2160 "slot[%u]: bus_width=%u, detect_pin=%d, "
2161 "detect_is_active_high=%s, wp_pin=%d\n",
2162 id, slot_data->bus_width, slot_data->detect_pin,
2163 slot_data->detect_is_active_high ? "true" : "false",
2166 mmc->ops = &atmci_ops;
2167 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2168 mmc->f_max = host->bus_hz / 2;
2169 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2171 mmc->caps |= MMC_CAP_SDIO_IRQ;
2172 if (host->caps.has_highspeed)
2173 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2175 * Without the read/write proof capability, it is strongly suggested to
2176 * use only one bit for data to prevent fifo underruns and overruns
2177 * which will corrupt data.
2179 if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2180 mmc->caps |= MMC_CAP_4_BIT_DATA;
2182 if (atmci_get_version(host) < 0x200) {
2183 mmc->max_segs = 256;
2184 mmc->max_blk_size = 4095;
2185 mmc->max_blk_count = 256;
2186 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2187 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2190 mmc->max_req_size = 32768 * 512;
2191 mmc->max_blk_size = 32768;
2192 mmc->max_blk_count = 512;
2195 /* Assume card is present initially */
2196 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2197 if (gpio_is_valid(slot->detect_pin)) {
2198 if (gpio_request(slot->detect_pin, "mmc_detect")) {
2199 dev_dbg(&mmc->class_dev, "no detect pin available\n");
2200 slot->detect_pin = -EBUSY;
2201 } else if (gpio_get_value(slot->detect_pin) ^
2202 slot->detect_is_active_high) {
2203 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2207 if (!gpio_is_valid(slot->detect_pin))
2208 mmc->caps |= MMC_CAP_NEEDS_POLL;
2210 if (gpio_is_valid(slot->wp_pin)) {
2211 if (gpio_request(slot->wp_pin, "mmc_wp")) {
2212 dev_dbg(&mmc->class_dev, "no WP pin available\n");
2213 slot->wp_pin = -EBUSY;
2217 host->slot[id] = slot;
2218 mmc_regulator_get_supply(mmc);
2221 if (gpio_is_valid(slot->detect_pin)) {
2224 setup_timer(&slot->detect_timer, atmci_detect_change,
2225 (unsigned long)slot);
2227 ret = request_irq(gpio_to_irq(slot->detect_pin),
2228 atmci_detect_interrupt,
2229 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2230 "mmc-detect", slot);
2232 dev_dbg(&mmc->class_dev,
2233 "could not request IRQ %d for detect pin\n",
2234 gpio_to_irq(slot->detect_pin));
2235 gpio_free(slot->detect_pin);
2236 slot->detect_pin = -EBUSY;
2240 atmci_init_debugfs(slot);
2245 static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
2248 /* Debugfs stuff is cleaned up by mmc core */
2250 set_bit(ATMCI_SHUTDOWN, &slot->flags);
2253 mmc_remove_host(slot->mmc);
2255 if (gpio_is_valid(slot->detect_pin)) {
2256 int pin = slot->detect_pin;
2258 free_irq(gpio_to_irq(pin), slot);
2259 del_timer_sync(&slot->detect_timer);
2262 if (gpio_is_valid(slot->wp_pin))
2263 gpio_free(slot->wp_pin);
2265 slot->host->slot[id] = NULL;
2266 mmc_free_host(slot->mmc);
2269 static bool atmci_filter(struct dma_chan *chan, void *pdata)
2271 struct mci_platform_data *sl_pdata = pdata;
2272 struct mci_dma_data *sl;
2277 sl = sl_pdata->dma_slave;
2278 if (sl && find_slave_dev(sl) == chan->device->dev) {
2279 chan->private = slave_data_ptr(sl);
2286 static bool atmci_configure_dma(struct atmel_mci *host)
2288 struct mci_platform_data *pdata;
2289 dma_cap_mask_t mask;
2294 pdata = host->pdev->dev.platform_data;
2297 dma_cap_set(DMA_SLAVE, mask);
2299 host->dma.chan = dma_request_slave_channel_compat(mask, atmci_filter, pdata,
2300 &host->pdev->dev, "rxtx");
2301 if (!host->dma.chan) {
2302 dev_warn(&host->pdev->dev, "no DMA channel available\n");
2305 dev_info(&host->pdev->dev,
2306 "using %s for DMA transfers\n",
2307 dma_chan_name(host->dma.chan));
2309 host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2310 host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2311 host->dma_conf.src_maxburst = 1;
2312 host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2313 host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2314 host->dma_conf.dst_maxburst = 1;
2315 host->dma_conf.device_fc = false;
2321 * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2322 * HSMCI provides DMA support and a new config register but no more supports
2325 static void __init atmci_get_cap(struct atmel_mci *host)
2327 unsigned int version;
2329 version = atmci_get_version(host);
2330 dev_info(&host->pdev->dev,
2331 "version: 0x%x\n", version);
2333 host->caps.has_dma_conf_reg = 0;
2334 host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2335 host->caps.has_cfg_reg = 0;
2336 host->caps.has_cstor_reg = 0;
2337 host->caps.has_highspeed = 0;
2338 host->caps.has_rwproof = 0;
2339 host->caps.has_odd_clk_div = 0;
2340 host->caps.has_bad_data_ordering = 1;
2341 host->caps.need_reset_after_xfer = 1;
2342 host->caps.need_blksz_mul_4 = 1;
2343 host->caps.need_notbusy_for_read_ops = 0;
2345 /* keep only major version number */
2346 switch (version & 0xf00) {
2348 host->caps.has_odd_clk_div = 1;
2351 host->caps.has_dma_conf_reg = 1;
2352 host->caps.has_pdc = 0;
2353 host->caps.has_cfg_reg = 1;
2354 host->caps.has_cstor_reg = 1;
2355 host->caps.has_highspeed = 1;
2357 host->caps.has_rwproof = 1;
2358 host->caps.need_blksz_mul_4 = 0;
2359 host->caps.need_notbusy_for_read_ops = 1;
2361 host->caps.has_bad_data_ordering = 0;
2362 host->caps.need_reset_after_xfer = 0;
2366 host->caps.has_pdc = 0;
2367 dev_warn(&host->pdev->dev,
2368 "Unmanaged mci version, set minimum capabilities\n");
2373 static int __init atmci_probe(struct platform_device *pdev)
2375 struct mci_platform_data *pdata;
2376 struct atmel_mci *host;
2377 struct resource *regs;
2378 unsigned int nr_slots;
2382 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2385 pdata = pdev->dev.platform_data;
2387 pdata = atmci_of_init(pdev);
2388 if (IS_ERR(pdata)) {
2389 dev_err(&pdev->dev, "platform data not available\n");
2390 return PTR_ERR(pdata);
2394 irq = platform_get_irq(pdev, 0);
2398 host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL);
2403 spin_lock_init(&host->lock);
2404 INIT_LIST_HEAD(&host->queue);
2406 host->mck = clk_get(&pdev->dev, "mci_clk");
2407 if (IS_ERR(host->mck)) {
2408 ret = PTR_ERR(host->mck);
2413 host->regs = ioremap(regs->start, resource_size(regs));
2417 ret = clk_prepare_enable(host->mck);
2419 goto err_request_irq;
2420 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2421 host->bus_hz = clk_get_rate(host->mck);
2422 clk_disable_unprepare(host->mck);
2424 host->mapbase = regs->start;
2426 tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2428 ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2430 goto err_request_irq;
2432 /* Get MCI capabilities and set operations according to it */
2433 atmci_get_cap(host);
2434 if (atmci_configure_dma(host)) {
2435 host->prepare_data = &atmci_prepare_data_dma;
2436 host->submit_data = &atmci_submit_data_dma;
2437 host->stop_transfer = &atmci_stop_transfer_dma;
2438 } else if (host->caps.has_pdc) {
2439 dev_info(&pdev->dev, "using PDC\n");
2440 host->prepare_data = &atmci_prepare_data_pdc;
2441 host->submit_data = &atmci_submit_data_pdc;
2442 host->stop_transfer = &atmci_stop_transfer_pdc;
2444 dev_info(&pdev->dev, "using PIO\n");
2445 host->prepare_data = &atmci_prepare_data;
2446 host->submit_data = &atmci_submit_data;
2447 host->stop_transfer = &atmci_stop_transfer;
2450 platform_set_drvdata(pdev, host);
2452 setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2454 /* We need at least one slot to succeed */
2457 if (pdata->slot[0].bus_width) {
2458 ret = atmci_init_slot(host, &pdata->slot[0],
2459 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2462 host->buf_size = host->slot[0]->mmc->max_req_size;
2465 if (pdata->slot[1].bus_width) {
2466 ret = atmci_init_slot(host, &pdata->slot[1],
2467 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2470 if (host->slot[1]->mmc->max_req_size > host->buf_size)
2472 host->slot[1]->mmc->max_req_size;
2477 dev_err(&pdev->dev, "init failed: no slot defined\n");
2481 if (!host->caps.has_rwproof) {
2482 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2483 &host->buf_phys_addr,
2485 if (!host->buffer) {
2487 dev_err(&pdev->dev, "buffer allocation failed\n");
2492 dev_info(&pdev->dev,
2493 "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2494 host->mapbase, irq, nr_slots);
2500 dma_release_channel(host->dma.chan);
2501 free_irq(irq, host);
2503 iounmap(host->regs);
2511 static int __exit atmci_remove(struct platform_device *pdev)
2513 struct atmel_mci *host = platform_get_drvdata(pdev);
2517 dma_free_coherent(&pdev->dev, host->buf_size,
2518 host->buffer, host->buf_phys_addr);
2520 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2522 atmci_cleanup_slot(host->slot[i], i);
2525 clk_prepare_enable(host->mck);
2526 atmci_writel(host, ATMCI_IDR, ~0UL);
2527 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2528 atmci_readl(host, ATMCI_SR);
2529 clk_disable_unprepare(host->mck);
2532 dma_release_channel(host->dma.chan);
2534 free_irq(platform_get_irq(pdev, 0), host);
2535 iounmap(host->regs);
2543 static struct platform_driver atmci_driver = {
2544 .remove = __exit_p(atmci_remove),
2546 .name = "atmel_mci",
2547 .of_match_table = of_match_ptr(atmci_dt_ids),
2551 static int __init atmci_init(void)
2553 return platform_driver_probe(&atmci_driver, atmci_probe);
2556 static void __exit atmci_exit(void)
2558 platform_driver_unregister(&atmci_driver);
2561 late_initcall(atmci_init); /* try to load after dma driver when built-in */
2562 module_exit(atmci_exit);
2564 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2565 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2566 MODULE_LICENSE("GPL v2");