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>
21 #include <linux/ioport.h>
22 #include <linux/module.h>
24 #include <linux/of_device.h>
25 #include <linux/of_gpio.h>
26 #include <linux/platform_device.h>
27 #include <linux/scatterlist.h>
28 #include <linux/seq_file.h>
29 #include <linux/slab.h>
30 #include <linux/stat.h>
31 #include <linux/types.h>
32 #include <linux/platform_data/atmel.h>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/sdio.h>
37 #include <mach/atmel-mci.h>
38 #include <linux/atmel-mci.h>
39 #include <linux/atmel_pdc.h>
41 #include <asm/cacheflush.h>
43 #include <asm/unaligned.h>
45 #include "atmel-mci-regs.h"
47 #define ATMCI_DATA_ERROR_FLAGS (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
48 #define ATMCI_DMA_THRESHOLD 16
57 enum atmel_mci_state {
61 STATE_WAITING_NOTBUSY,
76 struct atmel_mci_caps {
77 bool has_dma_conf_reg;
84 bool has_bad_data_ordering;
85 bool need_reset_after_xfer;
86 bool need_blksz_mul_4;
87 bool need_notbusy_for_read_ops;
90 struct atmel_mci_dma {
91 struct dma_chan *chan;
92 struct dma_async_tx_descriptor *data_desc;
96 * struct atmel_mci - MMC controller state shared between all slots
97 * @lock: Spinlock protecting the queue and associated data.
98 * @regs: Pointer to MMIO registers.
99 * @sg: Scatterlist entry currently being processed by PIO or PDC code.
100 * @pio_offset: Offset into the current scatterlist entry.
101 * @buffer: Buffer used if we don't have the r/w proof capability. We
102 * don't have the time to switch pdc buffers so we have to use only
103 * one buffer for the full transaction.
104 * @buf_size: size of the buffer.
105 * @phys_buf_addr: buffer address needed for pdc.
106 * @cur_slot: The slot which is currently using the controller.
107 * @mrq: The request currently being processed on @cur_slot,
108 * or NULL if the controller is idle.
109 * @cmd: The command currently being sent to the card, or NULL.
110 * @data: The data currently being transferred, or NULL if no data
111 * transfer is in progress.
112 * @data_size: just data->blocks * data->blksz.
113 * @dma: DMA client state.
114 * @data_chan: DMA channel being used for the current data transfer.
115 * @cmd_status: Snapshot of SR taken upon completion of the current
116 * command. Only valid when EVENT_CMD_COMPLETE is pending.
117 * @data_status: Snapshot of SR taken upon completion of the current
118 * data transfer. Only valid when EVENT_DATA_COMPLETE or
119 * EVENT_DATA_ERROR is pending.
120 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
122 * @tasklet: Tasklet running the request state machine.
123 * @pending_events: Bitmask of events flagged by the interrupt handler
124 * to be processed by the tasklet.
125 * @completed_events: Bitmask of events which the state machine has
127 * @state: Tasklet state.
128 * @queue: List of slots waiting for access to the controller.
129 * @need_clock_update: Update the clock rate before the next request.
130 * @need_reset: Reset controller before next request.
131 * @timer: Timer to balance the data timeout error flag which cannot rise.
132 * @mode_reg: Value of the MR register.
133 * @cfg_reg: Value of the CFG register.
134 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
135 * rate and timeout calculations.
136 * @mapbase: Physical address of the MMIO registers.
137 * @mck: The peripheral bus clock hooked up to the MMC controller.
138 * @pdev: Platform device associated with the MMC controller.
139 * @slot: Slots sharing this MMC controller.
140 * @caps: MCI capabilities depending on MCI version.
141 * @prepare_data: function to setup MCI before data transfer which
142 * depends on MCI capabilities.
143 * @submit_data: function to start data transfer which depends on MCI
145 * @stop_transfer: function to stop data transfer which depends on MCI
151 * @lock is a softirq-safe spinlock protecting @queue as well as
152 * @cur_slot, @mrq and @state. These must always be updated
153 * at the same time while holding @lock.
155 * @lock also protects mode_reg and need_clock_update since these are
156 * used to synchronize mode register updates with the queue
159 * The @mrq field of struct atmel_mci_slot is also protected by @lock,
160 * and must always be written at the same time as the slot is added to
163 * @pending_events and @completed_events are accessed using atomic bit
164 * operations, so they don't need any locking.
166 * None of the fields touched by the interrupt handler need any
167 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
168 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
169 * interrupts must be disabled and @data_status updated with a
170 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
171 * CMDRDY interrupt must be disabled and @cmd_status updated with a
172 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
173 * bytes_xfered field of @data must be written. This is ensured by
180 struct scatterlist *sg;
182 unsigned int pio_offset;
183 unsigned int *buffer;
184 unsigned int buf_size;
185 dma_addr_t buf_phys_addr;
187 struct atmel_mci_slot *cur_slot;
188 struct mmc_request *mrq;
189 struct mmc_command *cmd;
190 struct mmc_data *data;
191 unsigned int data_size;
193 struct atmel_mci_dma dma;
194 struct dma_chan *data_chan;
195 struct dma_slave_config dma_conf;
201 struct tasklet_struct tasklet;
202 unsigned long pending_events;
203 unsigned long completed_events;
204 enum atmel_mci_state state;
205 struct list_head queue;
207 bool need_clock_update;
209 struct timer_list timer;
212 unsigned long bus_hz;
213 unsigned long mapbase;
215 struct platform_device *pdev;
217 struct atmel_mci_slot *slot[ATMCI_MAX_NR_SLOTS];
219 struct atmel_mci_caps caps;
221 u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
222 void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
223 void (*stop_transfer)(struct atmel_mci *host);
227 * struct atmel_mci_slot - MMC slot state
228 * @mmc: The mmc_host representing this slot.
229 * @host: The MMC controller this slot is using.
230 * @sdc_reg: Value of SDCR to be written before using this slot.
231 * @sdio_irq: SDIO irq mask for this slot.
232 * @mrq: mmc_request currently being processed or waiting to be
233 * processed, or NULL when the slot is idle.
234 * @queue_node: List node for placing this node in the @queue list of
236 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
237 * @flags: Random state bits associated with the slot.
238 * @detect_pin: GPIO pin used for card detection, or negative if not
240 * @wp_pin: GPIO pin used for card write protect sending, or negative
242 * @detect_is_active_high: The state of the detect pin when it is active.
243 * @detect_timer: Timer used for debouncing @detect_pin interrupts.
245 struct atmel_mci_slot {
246 struct mmc_host *mmc;
247 struct atmel_mci *host;
252 struct mmc_request *mrq;
253 struct list_head queue_node;
257 #define ATMCI_CARD_PRESENT 0
258 #define ATMCI_CARD_NEED_INIT 1
259 #define ATMCI_SHUTDOWN 2
263 bool detect_is_active_high;
265 struct timer_list detect_timer;
268 #define atmci_test_and_clear_pending(host, event) \
269 test_and_clear_bit(event, &host->pending_events)
270 #define atmci_set_completed(host, event) \
271 set_bit(event, &host->completed_events)
272 #define atmci_set_pending(host, event) \
273 set_bit(event, &host->pending_events)
276 * The debugfs stuff below is mostly optimized away when
277 * CONFIG_DEBUG_FS is not set.
279 static int atmci_req_show(struct seq_file *s, void *v)
281 struct atmel_mci_slot *slot = s->private;
282 struct mmc_request *mrq;
283 struct mmc_command *cmd;
284 struct mmc_command *stop;
285 struct mmc_data *data;
287 /* Make sure we get a consistent snapshot */
288 spin_lock_bh(&slot->host->lock);
298 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
299 cmd->opcode, cmd->arg, cmd->flags,
300 cmd->resp[0], cmd->resp[1], cmd->resp[2],
301 cmd->resp[3], cmd->error);
303 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
304 data->bytes_xfered, data->blocks,
305 data->blksz, data->flags, data->error);
308 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
309 stop->opcode, stop->arg, stop->flags,
310 stop->resp[0], stop->resp[1], stop->resp[2],
311 stop->resp[3], stop->error);
314 spin_unlock_bh(&slot->host->lock);
319 static int atmci_req_open(struct inode *inode, struct file *file)
321 return single_open(file, atmci_req_show, inode->i_private);
324 static const struct file_operations atmci_req_fops = {
325 .owner = THIS_MODULE,
326 .open = atmci_req_open,
329 .release = single_release,
332 static void atmci_show_status_reg(struct seq_file *s,
333 const char *regname, u32 value)
335 static const char *sr_bit[] = {
366 seq_printf(s, "%s:\t0x%08x", regname, value);
367 for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
368 if (value & (1 << i)) {
370 seq_printf(s, " %s", sr_bit[i]);
372 seq_puts(s, " UNKNOWN");
378 static int atmci_regs_show(struct seq_file *s, void *v)
380 struct atmel_mci *host = s->private;
385 buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
390 * Grab a more or less consistent snapshot. Note that we're
391 * not disabling interrupts, so IMR and SR may not be
394 ret = clk_prepare_enable(host->mck);
398 spin_lock_bh(&host->lock);
399 memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
400 spin_unlock_bh(&host->lock);
402 clk_disable_unprepare(host->mck);
404 seq_printf(s, "MR:\t0x%08x%s%s ",
406 buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
407 buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
408 if (host->caps.has_odd_clk_div)
409 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
410 ((buf[ATMCI_MR / 4] & 0xff) << 1)
411 | ((buf[ATMCI_MR / 4] >> 16) & 1));
413 seq_printf(s, "CLKDIV=%u\n",
414 (buf[ATMCI_MR / 4] & 0xff));
415 seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
416 seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
417 seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
418 seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
420 buf[ATMCI_BLKR / 4] & 0xffff,
421 (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
422 if (host->caps.has_cstor_reg)
423 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
425 /* Don't read RSPR and RDR; it will consume the data there */
427 atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
428 atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
430 if (host->caps.has_dma_conf_reg) {
433 val = buf[ATMCI_DMA / 4];
434 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
437 1 << (((val >> 4) & 3) + 1) : 1,
438 val & ATMCI_DMAEN ? " DMAEN" : "");
440 if (host->caps.has_cfg_reg) {
443 val = buf[ATMCI_CFG / 4];
444 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
446 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
447 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
448 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
449 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
458 static int atmci_regs_open(struct inode *inode, struct file *file)
460 return single_open(file, atmci_regs_show, inode->i_private);
463 static const struct file_operations atmci_regs_fops = {
464 .owner = THIS_MODULE,
465 .open = atmci_regs_open,
468 .release = single_release,
471 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
473 struct mmc_host *mmc = slot->mmc;
474 struct atmel_mci *host = slot->host;
478 root = mmc->debugfs_root;
482 node = debugfs_create_file("regs", S_IRUSR, root, host,
489 node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
493 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
497 node = debugfs_create_x32("pending_events", S_IRUSR, root,
498 (u32 *)&host->pending_events);
502 node = debugfs_create_x32("completed_events", S_IRUSR, root,
503 (u32 *)&host->completed_events);
510 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
513 #if defined(CONFIG_OF)
514 static const struct of_device_id atmci_dt_ids[] = {
515 { .compatible = "atmel,hsmci" },
519 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
521 static struct mci_platform_data*
522 atmci_of_init(struct platform_device *pdev)
524 struct device_node *np = pdev->dev.of_node;
525 struct device_node *cnp;
526 struct mci_platform_data *pdata;
530 dev_err(&pdev->dev, "device node not found\n");
531 return ERR_PTR(-EINVAL);
534 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
536 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
537 return ERR_PTR(-ENOMEM);
540 for_each_child_of_node(np, cnp) {
541 if (of_property_read_u32(cnp, "reg", &slot_id)) {
542 dev_warn(&pdev->dev, "reg property is missing for %s\n",
547 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
548 dev_warn(&pdev->dev, "can't have more than %d slots\n",
553 if (of_property_read_u32(cnp, "bus-width",
554 &pdata->slot[slot_id].bus_width))
555 pdata->slot[slot_id].bus_width = 1;
557 pdata->slot[slot_id].detect_pin =
558 of_get_named_gpio(cnp, "cd-gpios", 0);
560 pdata->slot[slot_id].detect_is_active_high =
561 of_property_read_bool(cnp, "cd-inverted");
563 pdata->slot[slot_id].wp_pin =
564 of_get_named_gpio(cnp, "wp-gpios", 0);
569 #else /* CONFIG_OF */
570 static inline struct mci_platform_data*
571 atmci_of_init(struct platform_device *dev)
573 return ERR_PTR(-EINVAL);
577 static inline unsigned int atmci_get_version(struct atmel_mci *host)
579 return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
582 static void atmci_timeout_timer(unsigned long data)
584 struct atmel_mci *host;
586 host = (struct atmel_mci *)data;
588 dev_dbg(&host->pdev->dev, "software timeout\n");
590 if (host->mrq->cmd->data) {
591 host->mrq->cmd->data->error = -ETIMEDOUT;
594 * With some SDIO modules, sometimes DMA transfer hangs. If
595 * stop_transfer() is not called then the DMA request is not
596 * removed, following ones are queued and never computed.
598 if (host->state == STATE_DATA_XFER)
599 host->stop_transfer(host);
601 host->mrq->cmd->error = -ETIMEDOUT;
604 host->need_reset = 1;
605 host->state = STATE_END_REQUEST;
607 tasklet_schedule(&host->tasklet);
610 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
614 * It is easier here to use us instead of ns for the timeout,
615 * it prevents from overflows during calculation.
617 unsigned int us = DIV_ROUND_UP(ns, 1000);
619 /* Maximum clock frequency is host->bus_hz/2 */
620 return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
623 static void atmci_set_timeout(struct atmel_mci *host,
624 struct atmel_mci_slot *slot, struct mmc_data *data)
626 static unsigned dtomul_to_shift[] = {
627 0, 4, 7, 8, 10, 12, 16, 20
633 timeout = atmci_ns_to_clocks(host, data->timeout_ns)
634 + data->timeout_clks;
636 for (dtomul = 0; dtomul < 8; dtomul++) {
637 unsigned shift = dtomul_to_shift[dtomul];
638 dtocyc = (timeout + (1 << shift) - 1) >> shift;
648 dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
649 dtocyc << dtomul_to_shift[dtomul]);
650 atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
654 * Return mask with command flags to be enabled for this command.
656 static u32 atmci_prepare_command(struct mmc_host *mmc,
657 struct mmc_command *cmd)
659 struct mmc_data *data;
662 cmd->error = -EINPROGRESS;
664 cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
666 if (cmd->flags & MMC_RSP_PRESENT) {
667 if (cmd->flags & MMC_RSP_136)
668 cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
670 cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
674 * This should really be MAXLAT_5 for CMD2 and ACMD41, but
675 * it's too difficult to determine whether this is an ACMD or
676 * not. Better make it 64.
678 cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
680 if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
681 cmdr |= ATMCI_CMDR_OPDCMD;
685 cmdr |= ATMCI_CMDR_START_XFER;
687 if (cmd->opcode == SD_IO_RW_EXTENDED) {
688 cmdr |= ATMCI_CMDR_SDIO_BLOCK;
690 if (data->flags & MMC_DATA_STREAM)
691 cmdr |= ATMCI_CMDR_STREAM;
692 else if (data->blocks > 1)
693 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
695 cmdr |= ATMCI_CMDR_BLOCK;
698 if (data->flags & MMC_DATA_READ)
699 cmdr |= ATMCI_CMDR_TRDIR_READ;
705 static void atmci_send_command(struct atmel_mci *host,
706 struct mmc_command *cmd, u32 cmd_flags)
711 dev_vdbg(&host->pdev->dev,
712 "start command: ARGR=0x%08x CMDR=0x%08x\n",
713 cmd->arg, cmd_flags);
715 atmci_writel(host, ATMCI_ARGR, cmd->arg);
716 atmci_writel(host, ATMCI_CMDR, cmd_flags);
719 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
721 dev_dbg(&host->pdev->dev, "send stop command\n");
722 atmci_send_command(host, data->stop, host->stop_cmdr);
723 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
727 * Configure given PDC buffer taking care of alignement issues.
728 * Update host->data_size and host->sg.
730 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
731 enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
733 u32 pointer_reg, counter_reg;
734 unsigned int buf_size;
736 if (dir == XFER_RECEIVE) {
737 pointer_reg = ATMEL_PDC_RPR;
738 counter_reg = ATMEL_PDC_RCR;
740 pointer_reg = ATMEL_PDC_TPR;
741 counter_reg = ATMEL_PDC_TCR;
744 if (buf_nb == PDC_SECOND_BUF) {
745 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
746 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
749 if (!host->caps.has_rwproof) {
750 buf_size = host->buf_size;
751 atmci_writel(host, pointer_reg, host->buf_phys_addr);
753 buf_size = sg_dma_len(host->sg);
754 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
757 if (host->data_size <= buf_size) {
758 if (host->data_size & 0x3) {
759 /* If size is different from modulo 4, transfer bytes */
760 atmci_writel(host, counter_reg, host->data_size);
761 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
763 /* Else transfer 32-bits words */
764 atmci_writel(host, counter_reg, host->data_size / 4);
768 /* We assume the size of a page is 32-bits aligned */
769 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
770 host->data_size -= sg_dma_len(host->sg);
772 host->sg = sg_next(host->sg);
777 * Configure PDC buffer according to the data size ie configuring one or two
778 * buffers. Don't use this function if you want to configure only the second
779 * buffer. In this case, use atmci_pdc_set_single_buf.
781 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
783 atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
785 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
789 * Unmap sg lists, called when transfer is finished.
791 static void atmci_pdc_cleanup(struct atmel_mci *host)
793 struct mmc_data *data = host->data;
796 dma_unmap_sg(&host->pdev->dev,
797 data->sg, data->sg_len,
798 ((data->flags & MMC_DATA_WRITE)
799 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
803 * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
804 * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
805 * interrupt needed for both transfer directions.
807 static void atmci_pdc_complete(struct atmel_mci *host)
809 int transfer_size = host->data->blocks * host->data->blksz;
812 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
814 if ((!host->caps.has_rwproof)
815 && (host->data->flags & MMC_DATA_READ)) {
816 if (host->caps.has_bad_data_ordering)
817 for (i = 0; i < transfer_size; i++)
818 host->buffer[i] = swab32(host->buffer[i]);
819 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
820 host->buffer, transfer_size);
823 atmci_pdc_cleanup(host);
825 dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
826 atmci_set_pending(host, EVENT_XFER_COMPLETE);
827 tasklet_schedule(&host->tasklet);
830 static void atmci_dma_cleanup(struct atmel_mci *host)
832 struct mmc_data *data = host->data;
835 dma_unmap_sg(host->dma.chan->device->dev,
836 data->sg, data->sg_len,
837 ((data->flags & MMC_DATA_WRITE)
838 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
842 * This function is called by the DMA driver from tasklet context.
844 static void atmci_dma_complete(void *arg)
846 struct atmel_mci *host = arg;
847 struct mmc_data *data = host->data;
849 dev_vdbg(&host->pdev->dev, "DMA complete\n");
851 if (host->caps.has_dma_conf_reg)
852 /* Disable DMA hardware handshaking on MCI */
853 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
855 atmci_dma_cleanup(host);
858 * If the card was removed, data will be NULL. No point trying
859 * to send the stop command or waiting for NBUSY in this case.
862 dev_dbg(&host->pdev->dev,
863 "(%s) set pending xfer complete\n", __func__);
864 atmci_set_pending(host, EVENT_XFER_COMPLETE);
865 tasklet_schedule(&host->tasklet);
868 * Regardless of what the documentation says, we have
869 * to wait for NOTBUSY even after block read
872 * When the DMA transfer is complete, the controller
873 * may still be reading the CRC from the card, i.e.
874 * the data transfer is still in progress and we
875 * haven't seen all the potential error bits yet.
877 * The interrupt handler will schedule a different
878 * tasklet to finish things up when the data transfer
879 * is completely done.
881 * We may not complete the mmc request here anyway
882 * because the mmc layer may call back and cause us to
883 * violate the "don't submit new operations from the
884 * completion callback" rule of the dma engine
887 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
892 * Returns a mask of interrupt flags to be enabled after the whole
893 * request has been prepared.
895 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
899 data->error = -EINPROGRESS;
902 host->sg_len = data->sg_len;
904 host->data_chan = NULL;
906 iflags = ATMCI_DATA_ERROR_FLAGS;
909 * Errata: MMC data write operation with less than 12
910 * bytes is impossible.
912 * Errata: MCI Transmit Data Register (TDR) FIFO
913 * corruption when length is not multiple of 4.
915 if (data->blocks * data->blksz < 12
916 || (data->blocks * data->blksz) & 3)
917 host->need_reset = true;
919 host->pio_offset = 0;
920 if (data->flags & MMC_DATA_READ)
921 iflags |= ATMCI_RXRDY;
923 iflags |= ATMCI_TXRDY;
929 * Set interrupt flags and set block length into the MCI mode register even
930 * if this value is also accessible in the MCI block register. It seems to be
931 * necessary before the High Speed MCI version. It also map sg and configure
935 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
939 enum dma_data_direction dir;
942 data->error = -EINPROGRESS;
946 iflags = ATMCI_DATA_ERROR_FLAGS;
948 /* Enable pdc mode */
949 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
951 if (data->flags & MMC_DATA_READ) {
952 dir = DMA_FROM_DEVICE;
953 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
956 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
960 tmp = atmci_readl(host, ATMCI_MR);
962 tmp |= ATMCI_BLKLEN(data->blksz);
963 atmci_writel(host, ATMCI_MR, tmp);
966 host->data_size = data->blocks * data->blksz;
967 sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
969 if ((!host->caps.has_rwproof)
970 && (host->data->flags & MMC_DATA_WRITE)) {
971 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
972 host->buffer, host->data_size);
973 if (host->caps.has_bad_data_ordering)
974 for (i = 0; i < host->data_size; i++)
975 host->buffer[i] = swab32(host->buffer[i]);
979 atmci_pdc_set_both_buf(host,
980 ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
986 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
988 struct dma_chan *chan;
989 struct dma_async_tx_descriptor *desc;
990 struct scatterlist *sg;
992 enum dma_data_direction direction;
993 enum dma_transfer_direction slave_dirn;
998 data->error = -EINPROGRESS;
1000 WARN_ON(host->data);
1004 iflags = ATMCI_DATA_ERROR_FLAGS;
1007 * We don't do DMA on "complex" transfers, i.e. with
1008 * non-word-aligned buffers or lengths. Also, we don't bother
1009 * with all the DMA setup overhead for short transfers.
1011 if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1012 return atmci_prepare_data(host, data);
1013 if (data->blksz & 3)
1014 return atmci_prepare_data(host, data);
1016 for_each_sg(data->sg, sg, data->sg_len, i) {
1017 if (sg->offset & 3 || sg->length & 3)
1018 return atmci_prepare_data(host, data);
1021 /* If we don't have a channel, we can't do DMA */
1022 chan = host->dma.chan;
1024 host->data_chan = chan;
1029 if (data->flags & MMC_DATA_READ) {
1030 direction = DMA_FROM_DEVICE;
1031 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1032 maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
1034 direction = DMA_TO_DEVICE;
1035 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1036 maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
1039 if (host->caps.has_dma_conf_reg)
1040 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1043 sglen = dma_map_sg(chan->device->dev, data->sg,
1044 data->sg_len, direction);
1046 dmaengine_slave_config(chan, &host->dma_conf);
1047 desc = dmaengine_prep_slave_sg(chan,
1048 data->sg, sglen, slave_dirn,
1049 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1053 host->dma.data_desc = desc;
1054 desc->callback = atmci_dma_complete;
1055 desc->callback_param = host;
1059 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1064 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1070 * Start PDC according to transfer direction.
1073 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1075 if (data->flags & MMC_DATA_READ)
1076 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1078 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1082 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1084 struct dma_chan *chan = host->data_chan;
1085 struct dma_async_tx_descriptor *desc = host->dma.data_desc;
1088 dmaengine_submit(desc);
1089 dma_async_issue_pending(chan);
1093 static void atmci_stop_transfer(struct atmel_mci *host)
1095 dev_dbg(&host->pdev->dev,
1096 "(%s) set pending xfer complete\n", __func__);
1097 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1098 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1102 * Stop data transfer because error(s) occurred.
1104 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1106 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1109 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1111 struct dma_chan *chan = host->data_chan;
1114 dmaengine_terminate_all(chan);
1115 atmci_dma_cleanup(host);
1117 /* Data transfer was stopped by the interrupt handler */
1118 dev_dbg(&host->pdev->dev,
1119 "(%s) set pending xfer complete\n", __func__);
1120 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1121 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1126 * Start a request: prepare data if needed, prepare the command and activate
1129 static void atmci_start_request(struct atmel_mci *host,
1130 struct atmel_mci_slot *slot)
1132 struct mmc_request *mrq;
1133 struct mmc_command *cmd;
1134 struct mmc_data *data;
1139 host->cur_slot = slot;
1142 host->pending_events = 0;
1143 host->completed_events = 0;
1144 host->cmd_status = 0;
1145 host->data_status = 0;
1147 dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1149 if (host->need_reset || host->caps.need_reset_after_xfer) {
1150 iflags = atmci_readl(host, ATMCI_IMR);
1151 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1152 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1153 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1154 atmci_writel(host, ATMCI_MR, host->mode_reg);
1155 if (host->caps.has_cfg_reg)
1156 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1157 atmci_writel(host, ATMCI_IER, iflags);
1158 host->need_reset = false;
1160 atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1162 iflags = atmci_readl(host, ATMCI_IMR);
1163 if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1164 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1167 if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1168 /* Send init sequence (74 clock cycles) */
1169 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1170 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1176 atmci_set_timeout(host, slot, data);
1178 /* Must set block count/size before sending command */
1179 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1180 | ATMCI_BLKLEN(data->blksz));
1181 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1182 ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1184 iflags |= host->prepare_data(host, data);
1187 iflags |= ATMCI_CMDRDY;
1189 cmdflags = atmci_prepare_command(slot->mmc, cmd);
1192 * DMA transfer should be started before sending the command to avoid
1193 * unexpected errors especially for read operations in SDIO mode.
1194 * Unfortunately, in PDC mode, command has to be sent before starting
1197 if (host->submit_data != &atmci_submit_data_dma)
1198 atmci_send_command(host, cmd, cmdflags);
1201 host->submit_data(host, data);
1203 if (host->submit_data == &atmci_submit_data_dma)
1204 atmci_send_command(host, cmd, cmdflags);
1207 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1208 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1209 if (!(data->flags & MMC_DATA_WRITE))
1210 host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1211 if (data->flags & MMC_DATA_STREAM)
1212 host->stop_cmdr |= ATMCI_CMDR_STREAM;
1214 host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1218 * We could have enabled interrupts earlier, but I suspect
1219 * that would open up a nice can of interesting race
1220 * conditions (e.g. command and data complete, but stop not
1223 atmci_writel(host, ATMCI_IER, iflags);
1225 mod_timer(&host->timer, jiffies + msecs_to_jiffies(2000));
1228 static void atmci_queue_request(struct atmel_mci *host,
1229 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1231 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1234 spin_lock_bh(&host->lock);
1236 if (host->state == STATE_IDLE) {
1237 host->state = STATE_SENDING_CMD;
1238 atmci_start_request(host, slot);
1240 dev_dbg(&host->pdev->dev, "queue request\n");
1241 list_add_tail(&slot->queue_node, &host->queue);
1243 spin_unlock_bh(&host->lock);
1246 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1248 struct atmel_mci_slot *slot = mmc_priv(mmc);
1249 struct atmel_mci *host = slot->host;
1250 struct mmc_data *data;
1253 dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1256 * We may "know" the card is gone even though there's still an
1257 * electrical connection. If so, we really need to communicate
1258 * this to the MMC core since there won't be any more
1259 * interrupts as the card is completely removed. Otherwise,
1260 * the MMC core might believe the card is still there even
1261 * though the card was just removed very slowly.
1263 if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1264 mrq->cmd->error = -ENOMEDIUM;
1265 mmc_request_done(mmc, mrq);
1269 /* We don't support multiple blocks of weird lengths. */
1271 if (data && data->blocks > 1 && data->blksz & 3) {
1272 mrq->cmd->error = -EINVAL;
1273 mmc_request_done(mmc, mrq);
1276 atmci_queue_request(host, slot, mrq);
1279 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1281 struct atmel_mci_slot *slot = mmc_priv(mmc);
1282 struct atmel_mci *host = slot->host;
1286 slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1287 switch (ios->bus_width) {
1288 case MMC_BUS_WIDTH_1:
1289 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1291 case MMC_BUS_WIDTH_4:
1292 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1297 unsigned int clock_min = ~0U;
1300 clk_prepare(host->mck);
1301 unprepare_clk = true;
1303 spin_lock_bh(&host->lock);
1304 if (!host->mode_reg) {
1305 clk_enable(host->mck);
1306 unprepare_clk = false;
1307 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1308 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1309 if (host->caps.has_cfg_reg)
1310 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1314 * Use mirror of ios->clock to prevent race with mmc
1315 * core ios update when finding the minimum.
1317 slot->clock = ios->clock;
1318 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1319 if (host->slot[i] && host->slot[i]->clock
1320 && host->slot[i]->clock < clock_min)
1321 clock_min = host->slot[i]->clock;
1324 /* Calculate clock divider */
1325 if (host->caps.has_odd_clk_div) {
1326 clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1328 dev_warn(&mmc->class_dev,
1329 "clock %u too slow; using %lu\n",
1330 clock_min, host->bus_hz / (511 + 2));
1333 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1334 | ATMCI_MR_CLKODD(clkdiv & 1);
1336 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1338 dev_warn(&mmc->class_dev,
1339 "clock %u too slow; using %lu\n",
1340 clock_min, host->bus_hz / (2 * 256));
1343 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1347 * WRPROOF and RDPROOF prevent overruns/underruns by
1348 * stopping the clock when the FIFO is full/empty.
1349 * This state is not expected to last for long.
1351 if (host->caps.has_rwproof)
1352 host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1354 if (host->caps.has_cfg_reg) {
1355 /* setup High Speed mode in relation with card capacity */
1356 if (ios->timing == MMC_TIMING_SD_HS)
1357 host->cfg_reg |= ATMCI_CFG_HSMODE;
1359 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1362 if (list_empty(&host->queue)) {
1363 atmci_writel(host, ATMCI_MR, host->mode_reg);
1364 if (host->caps.has_cfg_reg)
1365 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1367 host->need_clock_update = true;
1370 spin_unlock_bh(&host->lock);
1372 bool any_slot_active = false;
1374 unprepare_clk = false;
1376 spin_lock_bh(&host->lock);
1378 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1379 if (host->slot[i] && host->slot[i]->clock) {
1380 any_slot_active = true;
1384 if (!any_slot_active) {
1385 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1386 if (host->mode_reg) {
1387 atmci_readl(host, ATMCI_MR);
1388 clk_disable(host->mck);
1389 unprepare_clk = true;
1393 spin_unlock_bh(&host->lock);
1397 clk_unprepare(host->mck);
1399 switch (ios->power_mode) {
1401 if (!IS_ERR(mmc->supply.vmmc))
1402 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1405 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1406 if (!IS_ERR(mmc->supply.vmmc))
1407 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1411 * TODO: None of the currently available AVR32-based
1412 * boards allow MMC power to be turned off. Implement
1413 * power control when this can be tested properly.
1415 * We also need to hook this into the clock management
1416 * somehow so that newly inserted cards aren't
1417 * subjected to a fast clock before we have a chance
1418 * to figure out what the maximum rate is. Currently,
1419 * there's no way to avoid this, and there never will
1420 * be for boards that don't support power control.
1426 static int atmci_get_ro(struct mmc_host *mmc)
1428 int read_only = -ENOSYS;
1429 struct atmel_mci_slot *slot = mmc_priv(mmc);
1431 if (gpio_is_valid(slot->wp_pin)) {
1432 read_only = gpio_get_value(slot->wp_pin);
1433 dev_dbg(&mmc->class_dev, "card is %s\n",
1434 read_only ? "read-only" : "read-write");
1440 static int atmci_get_cd(struct mmc_host *mmc)
1442 int present = -ENOSYS;
1443 struct atmel_mci_slot *slot = mmc_priv(mmc);
1445 if (gpio_is_valid(slot->detect_pin)) {
1446 present = !(gpio_get_value(slot->detect_pin) ^
1447 slot->detect_is_active_high);
1448 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1449 present ? "" : "not ");
1455 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1457 struct atmel_mci_slot *slot = mmc_priv(mmc);
1458 struct atmel_mci *host = slot->host;
1461 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1463 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1466 static const struct mmc_host_ops atmci_ops = {
1467 .request = atmci_request,
1468 .set_ios = atmci_set_ios,
1469 .get_ro = atmci_get_ro,
1470 .get_cd = atmci_get_cd,
1471 .enable_sdio_irq = atmci_enable_sdio_irq,
1474 /* Called with host->lock held */
1475 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1476 __releases(&host->lock)
1477 __acquires(&host->lock)
1479 struct atmel_mci_slot *slot = NULL;
1480 struct mmc_host *prev_mmc = host->cur_slot->mmc;
1482 WARN_ON(host->cmd || host->data);
1485 * Update the MMC clock rate if necessary. This may be
1486 * necessary if set_ios() is called when a different slot is
1487 * busy transferring data.
1489 if (host->need_clock_update) {
1490 atmci_writel(host, ATMCI_MR, host->mode_reg);
1491 if (host->caps.has_cfg_reg)
1492 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1495 host->cur_slot->mrq = NULL;
1497 if (!list_empty(&host->queue)) {
1498 slot = list_entry(host->queue.next,
1499 struct atmel_mci_slot, queue_node);
1500 list_del(&slot->queue_node);
1501 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1502 mmc_hostname(slot->mmc));
1503 host->state = STATE_SENDING_CMD;
1504 atmci_start_request(host, slot);
1506 dev_vdbg(&host->pdev->dev, "list empty\n");
1507 host->state = STATE_IDLE;
1510 del_timer(&host->timer);
1512 spin_unlock(&host->lock);
1513 mmc_request_done(prev_mmc, mrq);
1514 spin_lock(&host->lock);
1517 static void atmci_command_complete(struct atmel_mci *host,
1518 struct mmc_command *cmd)
1520 u32 status = host->cmd_status;
1522 /* Read the response from the card (up to 16 bytes) */
1523 cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1524 cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1525 cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1526 cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1528 if (status & ATMCI_RTOE)
1529 cmd->error = -ETIMEDOUT;
1530 else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1531 cmd->error = -EILSEQ;
1532 else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1534 else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1535 if (host->caps.need_blksz_mul_4) {
1536 cmd->error = -EINVAL;
1537 host->need_reset = 1;
1543 static void atmci_detect_change(unsigned long data)
1545 struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data;
1550 * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1551 * freeing the interrupt. We must not re-enable the interrupt
1552 * if it has been freed, and if we're shutting down, it
1553 * doesn't really matter whether the card is present or not.
1556 if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1559 enable_irq(gpio_to_irq(slot->detect_pin));
1560 present = !(gpio_get_value(slot->detect_pin) ^
1561 slot->detect_is_active_high);
1562 present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1564 dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1565 present, present_old);
1567 if (present != present_old) {
1568 struct atmel_mci *host = slot->host;
1569 struct mmc_request *mrq;
1571 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1572 present ? "inserted" : "removed");
1574 spin_lock(&host->lock);
1577 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1579 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1581 /* Clean up queue if present */
1584 if (mrq == host->mrq) {
1586 * Reset controller to terminate any ongoing
1587 * commands or data transfers.
1589 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1590 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1591 atmci_writel(host, ATMCI_MR, host->mode_reg);
1592 if (host->caps.has_cfg_reg)
1593 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1598 switch (host->state) {
1601 case STATE_SENDING_CMD:
1602 mrq->cmd->error = -ENOMEDIUM;
1604 host->stop_transfer(host);
1606 case STATE_DATA_XFER:
1607 mrq->data->error = -ENOMEDIUM;
1608 host->stop_transfer(host);
1610 case STATE_WAITING_NOTBUSY:
1611 mrq->data->error = -ENOMEDIUM;
1613 case STATE_SENDING_STOP:
1614 mrq->stop->error = -ENOMEDIUM;
1616 case STATE_END_REQUEST:
1620 atmci_request_end(host, mrq);
1622 list_del(&slot->queue_node);
1623 mrq->cmd->error = -ENOMEDIUM;
1625 mrq->data->error = -ENOMEDIUM;
1627 mrq->stop->error = -ENOMEDIUM;
1629 spin_unlock(&host->lock);
1630 mmc_request_done(slot->mmc, mrq);
1631 spin_lock(&host->lock);
1634 spin_unlock(&host->lock);
1636 mmc_detect_change(slot->mmc, 0);
1640 static void atmci_tasklet_func(unsigned long priv)
1642 struct atmel_mci *host = (struct atmel_mci *)priv;
1643 struct mmc_request *mrq = host->mrq;
1644 struct mmc_data *data = host->data;
1645 enum atmel_mci_state state = host->state;
1646 enum atmel_mci_state prev_state;
1649 spin_lock(&host->lock);
1651 state = host->state;
1653 dev_vdbg(&host->pdev->dev,
1654 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1655 state, host->pending_events, host->completed_events,
1656 atmci_readl(host, ATMCI_IMR));
1660 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1666 case STATE_SENDING_CMD:
1668 * Command has been sent, we are waiting for command
1669 * ready. Then we have three next states possible:
1670 * END_REQUEST by default, WAITING_NOTBUSY if it's a
1671 * command needing it or DATA_XFER if there is data.
1673 dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1674 if (!atmci_test_and_clear_pending(host,
1678 dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1680 atmci_set_completed(host, EVENT_CMD_RDY);
1681 atmci_command_complete(host, mrq->cmd);
1683 dev_dbg(&host->pdev->dev,
1684 "command with data transfer");
1686 * If there is a command error don't start
1689 if (mrq->cmd->error) {
1690 host->stop_transfer(host);
1692 atmci_writel(host, ATMCI_IDR,
1693 ATMCI_TXRDY | ATMCI_RXRDY
1694 | ATMCI_DATA_ERROR_FLAGS);
1695 state = STATE_END_REQUEST;
1697 state = STATE_DATA_XFER;
1698 } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1699 dev_dbg(&host->pdev->dev,
1700 "command response need waiting notbusy");
1701 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1702 state = STATE_WAITING_NOTBUSY;
1704 state = STATE_END_REQUEST;
1708 case STATE_DATA_XFER:
1709 if (atmci_test_and_clear_pending(host,
1710 EVENT_DATA_ERROR)) {
1711 dev_dbg(&host->pdev->dev, "set completed data error\n");
1712 atmci_set_completed(host, EVENT_DATA_ERROR);
1713 state = STATE_END_REQUEST;
1718 * A data transfer is in progress. The event expected
1719 * to move to the next state depends of data transfer
1720 * type (PDC or DMA). Once transfer done we can move
1721 * to the next step which is WAITING_NOTBUSY in write
1722 * case and directly SENDING_STOP in read case.
1724 dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1725 if (!atmci_test_and_clear_pending(host,
1726 EVENT_XFER_COMPLETE))
1729 dev_dbg(&host->pdev->dev,
1730 "(%s) set completed xfer complete\n",
1732 atmci_set_completed(host, EVENT_XFER_COMPLETE);
1734 if (host->caps.need_notbusy_for_read_ops ||
1735 (host->data->flags & MMC_DATA_WRITE)) {
1736 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1737 state = STATE_WAITING_NOTBUSY;
1738 } else if (host->mrq->stop) {
1739 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1740 atmci_send_stop_cmd(host, data);
1741 state = STATE_SENDING_STOP;
1744 data->bytes_xfered = data->blocks * data->blksz;
1746 state = STATE_END_REQUEST;
1750 case STATE_WAITING_NOTBUSY:
1752 * We can be in the state for two reasons: a command
1753 * requiring waiting not busy signal (stop command
1754 * included) or a write operation. In the latest case,
1755 * we need to send a stop command.
1757 dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1758 if (!atmci_test_and_clear_pending(host,
1762 dev_dbg(&host->pdev->dev, "set completed not busy\n");
1763 atmci_set_completed(host, EVENT_NOTBUSY);
1767 * For some commands such as CMD53, even if
1768 * there is data transfer, there is no stop
1771 if (host->mrq->stop) {
1772 atmci_writel(host, ATMCI_IER,
1774 atmci_send_stop_cmd(host, data);
1775 state = STATE_SENDING_STOP;
1778 data->bytes_xfered = data->blocks
1781 state = STATE_END_REQUEST;
1784 state = STATE_END_REQUEST;
1787 case STATE_SENDING_STOP:
1789 * In this state, it is important to set host->data to
1790 * NULL (which is tested in the waiting notbusy state)
1791 * in order to go to the end request state instead of
1792 * sending stop again.
1794 dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1795 if (!atmci_test_and_clear_pending(host,
1799 dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1801 data->bytes_xfered = data->blocks * data->blksz;
1803 atmci_command_complete(host, mrq->stop);
1804 if (mrq->stop->error) {
1805 host->stop_transfer(host);
1806 atmci_writel(host, ATMCI_IDR,
1807 ATMCI_TXRDY | ATMCI_RXRDY
1808 | ATMCI_DATA_ERROR_FLAGS);
1809 state = STATE_END_REQUEST;
1811 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1812 state = STATE_WAITING_NOTBUSY;
1817 case STATE_END_REQUEST:
1818 atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1819 | ATMCI_DATA_ERROR_FLAGS);
1820 status = host->data_status;
1821 if (unlikely(status)) {
1822 host->stop_transfer(host);
1825 if (status & ATMCI_DTOE) {
1826 data->error = -ETIMEDOUT;
1827 } else if (status & ATMCI_DCRCE) {
1828 data->error = -EILSEQ;
1835 atmci_request_end(host, host->mrq);
1839 } while (state != prev_state);
1841 host->state = state;
1843 spin_unlock(&host->lock);
1846 static void atmci_read_data_pio(struct atmel_mci *host)
1848 struct scatterlist *sg = host->sg;
1849 void *buf = sg_virt(sg);
1850 unsigned int offset = host->pio_offset;
1851 struct mmc_data *data = host->data;
1854 unsigned int nbytes = 0;
1857 value = atmci_readl(host, ATMCI_RDR);
1858 if (likely(offset + 4 <= sg->length)) {
1859 put_unaligned(value, (u32 *)(buf + offset));
1864 if (offset == sg->length) {
1865 flush_dcache_page(sg_page(sg));
1866 host->sg = sg = sg_next(sg);
1868 if (!sg || !host->sg_len)
1875 unsigned int remaining = sg->length - offset;
1876 memcpy(buf + offset, &value, remaining);
1877 nbytes += remaining;
1879 flush_dcache_page(sg_page(sg));
1880 host->sg = sg = sg_next(sg);
1882 if (!sg || !host->sg_len)
1885 offset = 4 - remaining;
1887 memcpy(buf, (u8 *)&value + remaining, offset);
1891 status = atmci_readl(host, ATMCI_SR);
1892 if (status & ATMCI_DATA_ERROR_FLAGS) {
1893 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1894 | ATMCI_DATA_ERROR_FLAGS));
1895 host->data_status = status;
1896 data->bytes_xfered += nbytes;
1899 } while (status & ATMCI_RXRDY);
1901 host->pio_offset = offset;
1902 data->bytes_xfered += nbytes;
1907 atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1908 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1909 data->bytes_xfered += nbytes;
1911 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1914 static void atmci_write_data_pio(struct atmel_mci *host)
1916 struct scatterlist *sg = host->sg;
1917 void *buf = sg_virt(sg);
1918 unsigned int offset = host->pio_offset;
1919 struct mmc_data *data = host->data;
1922 unsigned int nbytes = 0;
1925 if (likely(offset + 4 <= sg->length)) {
1926 value = get_unaligned((u32 *)(buf + offset));
1927 atmci_writel(host, ATMCI_TDR, value);
1931 if (offset == sg->length) {
1932 host->sg = sg = sg_next(sg);
1934 if (!sg || !host->sg_len)
1941 unsigned int remaining = sg->length - offset;
1944 memcpy(&value, buf + offset, remaining);
1945 nbytes += remaining;
1947 host->sg = sg = sg_next(sg);
1949 if (!sg || !host->sg_len) {
1950 atmci_writel(host, ATMCI_TDR, value);
1954 offset = 4 - remaining;
1956 memcpy((u8 *)&value + remaining, buf, offset);
1957 atmci_writel(host, ATMCI_TDR, value);
1961 status = atmci_readl(host, ATMCI_SR);
1962 if (status & ATMCI_DATA_ERROR_FLAGS) {
1963 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1964 | ATMCI_DATA_ERROR_FLAGS));
1965 host->data_status = status;
1966 data->bytes_xfered += nbytes;
1969 } while (status & ATMCI_TXRDY);
1971 host->pio_offset = offset;
1972 data->bytes_xfered += nbytes;
1977 atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1978 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1979 data->bytes_xfered += nbytes;
1981 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1984 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1988 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1989 struct atmel_mci_slot *slot = host->slot[i];
1990 if (slot && (status & slot->sdio_irq)) {
1991 mmc_signal_sdio_irq(slot->mmc);
1997 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1999 struct atmel_mci *host = dev_id;
2000 u32 status, mask, pending;
2001 unsigned int pass_count = 0;
2004 status = atmci_readl(host, ATMCI_SR);
2005 mask = atmci_readl(host, ATMCI_IMR);
2006 pending = status & mask;
2010 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2011 dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2012 atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2013 | ATMCI_RXRDY | ATMCI_TXRDY
2014 | ATMCI_ENDRX | ATMCI_ENDTX
2015 | ATMCI_RXBUFF | ATMCI_TXBUFE);
2017 host->data_status = status;
2018 dev_dbg(&host->pdev->dev, "set pending data error\n");
2020 atmci_set_pending(host, EVENT_DATA_ERROR);
2021 tasklet_schedule(&host->tasklet);
2024 if (pending & ATMCI_TXBUFE) {
2025 dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2026 atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2027 atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2029 * We can receive this interruption before having configured
2030 * the second pdc buffer, so we need to reconfigure first and
2031 * second buffers again
2033 if (host->data_size) {
2034 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2035 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2036 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2038 atmci_pdc_complete(host);
2040 } else if (pending & ATMCI_ENDTX) {
2041 dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2042 atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2044 if (host->data_size) {
2045 atmci_pdc_set_single_buf(host,
2046 XFER_TRANSMIT, PDC_SECOND_BUF);
2047 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2051 if (pending & ATMCI_RXBUFF) {
2052 dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2053 atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2054 atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2056 * We can receive this interruption before having configured
2057 * the second pdc buffer, so we need to reconfigure first and
2058 * second buffers again
2060 if (host->data_size) {
2061 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2062 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2063 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2065 atmci_pdc_complete(host);
2067 } else if (pending & ATMCI_ENDRX) {
2068 dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2069 atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2071 if (host->data_size) {
2072 atmci_pdc_set_single_buf(host,
2073 XFER_RECEIVE, PDC_SECOND_BUF);
2074 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2079 * First mci IPs, so mainly the ones having pdc, have some
2080 * issues with the notbusy signal. You can't get it after
2081 * data transmission if you have not sent a stop command.
2082 * The appropriate workaround is to use the BLKE signal.
2084 if (pending & ATMCI_BLKE) {
2085 dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2086 atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2088 dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2089 atmci_set_pending(host, EVENT_NOTBUSY);
2090 tasklet_schedule(&host->tasklet);
2093 if (pending & ATMCI_NOTBUSY) {
2094 dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2095 atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2097 dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2098 atmci_set_pending(host, EVENT_NOTBUSY);
2099 tasklet_schedule(&host->tasklet);
2102 if (pending & ATMCI_RXRDY)
2103 atmci_read_data_pio(host);
2104 if (pending & ATMCI_TXRDY)
2105 atmci_write_data_pio(host);
2107 if (pending & ATMCI_CMDRDY) {
2108 dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2109 atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2110 host->cmd_status = status;
2112 dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2113 atmci_set_pending(host, EVENT_CMD_RDY);
2114 tasklet_schedule(&host->tasklet);
2117 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2118 atmci_sdio_interrupt(host, status);
2120 } while (pass_count++ < 5);
2122 return pass_count ? IRQ_HANDLED : IRQ_NONE;
2125 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2127 struct atmel_mci_slot *slot = dev_id;
2130 * Disable interrupts until the pin has stabilized and check
2131 * the state then. Use mod_timer() since we may be in the
2132 * middle of the timer routine when this interrupt triggers.
2134 disable_irq_nosync(irq);
2135 mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2140 static int __init atmci_init_slot(struct atmel_mci *host,
2141 struct mci_slot_pdata *slot_data, unsigned int id,
2142 u32 sdc_reg, u32 sdio_irq)
2144 struct mmc_host *mmc;
2145 struct atmel_mci_slot *slot;
2147 mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2151 slot = mmc_priv(mmc);
2154 slot->detect_pin = slot_data->detect_pin;
2155 slot->wp_pin = slot_data->wp_pin;
2156 slot->detect_is_active_high = slot_data->detect_is_active_high;
2157 slot->sdc_reg = sdc_reg;
2158 slot->sdio_irq = sdio_irq;
2160 dev_dbg(&mmc->class_dev,
2161 "slot[%u]: bus_width=%u, detect_pin=%d, "
2162 "detect_is_active_high=%s, wp_pin=%d\n",
2163 id, slot_data->bus_width, slot_data->detect_pin,
2164 slot_data->detect_is_active_high ? "true" : "false",
2167 mmc->ops = &atmci_ops;
2168 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2169 mmc->f_max = host->bus_hz / 2;
2170 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2172 mmc->caps |= MMC_CAP_SDIO_IRQ;
2173 if (host->caps.has_highspeed)
2174 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2176 * Without the read/write proof capability, it is strongly suggested to
2177 * use only one bit for data to prevent fifo underruns and overruns
2178 * which will corrupt data.
2180 if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2181 mmc->caps |= MMC_CAP_4_BIT_DATA;
2183 if (atmci_get_version(host) < 0x200) {
2184 mmc->max_segs = 256;
2185 mmc->max_blk_size = 4095;
2186 mmc->max_blk_count = 256;
2187 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2188 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2191 mmc->max_req_size = 32768 * 512;
2192 mmc->max_blk_size = 32768;
2193 mmc->max_blk_count = 512;
2196 /* Assume card is present initially */
2197 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2198 if (gpio_is_valid(slot->detect_pin)) {
2199 if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
2201 dev_dbg(&mmc->class_dev, "no detect pin available\n");
2202 slot->detect_pin = -EBUSY;
2203 } else if (gpio_get_value(slot->detect_pin) ^
2204 slot->detect_is_active_high) {
2205 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2209 if (!gpio_is_valid(slot->detect_pin))
2210 mmc->caps |= MMC_CAP_NEEDS_POLL;
2212 if (gpio_is_valid(slot->wp_pin)) {
2213 if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
2215 dev_dbg(&mmc->class_dev, "no WP pin available\n");
2216 slot->wp_pin = -EBUSY;
2220 host->slot[id] = slot;
2221 mmc_regulator_get_supply(mmc);
2224 if (gpio_is_valid(slot->detect_pin)) {
2227 setup_timer(&slot->detect_timer, atmci_detect_change,
2228 (unsigned long)slot);
2230 ret = request_irq(gpio_to_irq(slot->detect_pin),
2231 atmci_detect_interrupt,
2232 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2233 "mmc-detect", slot);
2235 dev_dbg(&mmc->class_dev,
2236 "could not request IRQ %d for detect pin\n",
2237 gpio_to_irq(slot->detect_pin));
2238 slot->detect_pin = -EBUSY;
2242 atmci_init_debugfs(slot);
2247 static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
2250 /* Debugfs stuff is cleaned up by mmc core */
2252 set_bit(ATMCI_SHUTDOWN, &slot->flags);
2255 mmc_remove_host(slot->mmc);
2257 if (gpio_is_valid(slot->detect_pin)) {
2258 int pin = slot->detect_pin;
2260 free_irq(gpio_to_irq(pin), slot);
2261 del_timer_sync(&slot->detect_timer);
2264 slot->host->slot[id] = NULL;
2265 mmc_free_host(slot->mmc);
2268 static bool atmci_filter(struct dma_chan *chan, void *pdata)
2270 struct mci_platform_data *sl_pdata = pdata;
2271 struct mci_dma_data *sl;
2276 sl = sl_pdata->dma_slave;
2277 if (sl && find_slave_dev(sl) == chan->device->dev) {
2278 chan->private = slave_data_ptr(sl);
2285 static bool atmci_configure_dma(struct atmel_mci *host)
2287 struct mci_platform_data *pdata;
2288 dma_cap_mask_t mask;
2293 pdata = host->pdev->dev.platform_data;
2296 dma_cap_set(DMA_SLAVE, mask);
2298 host->dma.chan = dma_request_slave_channel_compat(mask, atmci_filter, pdata,
2299 &host->pdev->dev, "rxtx");
2300 if (!host->dma.chan) {
2301 dev_warn(&host->pdev->dev, "no DMA channel available\n");
2304 dev_info(&host->pdev->dev,
2305 "using %s for DMA transfers\n",
2306 dma_chan_name(host->dma.chan));
2308 host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2309 host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2310 host->dma_conf.src_maxburst = 1;
2311 host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2312 host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2313 host->dma_conf.dst_maxburst = 1;
2314 host->dma_conf.device_fc = false;
2320 * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2321 * HSMCI provides DMA support and a new config register but no more supports
2324 static void __init atmci_get_cap(struct atmel_mci *host)
2326 unsigned int version;
2328 version = atmci_get_version(host);
2329 dev_info(&host->pdev->dev,
2330 "version: 0x%x\n", version);
2332 host->caps.has_dma_conf_reg = 0;
2333 host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2334 host->caps.has_cfg_reg = 0;
2335 host->caps.has_cstor_reg = 0;
2336 host->caps.has_highspeed = 0;
2337 host->caps.has_rwproof = 0;
2338 host->caps.has_odd_clk_div = 0;
2339 host->caps.has_bad_data_ordering = 1;
2340 host->caps.need_reset_after_xfer = 1;
2341 host->caps.need_blksz_mul_4 = 1;
2342 host->caps.need_notbusy_for_read_ops = 0;
2344 /* keep only major version number */
2345 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 = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2403 spin_lock_init(&host->lock);
2404 INIT_LIST_HEAD(&host->queue);
2406 host->mck = devm_clk_get(&pdev->dev, "mci_clk");
2407 if (IS_ERR(host->mck))
2408 return PTR_ERR(host->mck);
2410 host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2414 ret = clk_prepare_enable(host->mck);
2418 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2419 host->bus_hz = clk_get_rate(host->mck);
2420 clk_disable_unprepare(host->mck);
2422 host->mapbase = regs->start;
2424 tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2426 ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2430 /* Get MCI capabilities and set operations according to it */
2431 atmci_get_cap(host);
2432 if (atmci_configure_dma(host)) {
2433 host->prepare_data = &atmci_prepare_data_dma;
2434 host->submit_data = &atmci_submit_data_dma;
2435 host->stop_transfer = &atmci_stop_transfer_dma;
2436 } else if (host->caps.has_pdc) {
2437 dev_info(&pdev->dev, "using PDC\n");
2438 host->prepare_data = &atmci_prepare_data_pdc;
2439 host->submit_data = &atmci_submit_data_pdc;
2440 host->stop_transfer = &atmci_stop_transfer_pdc;
2442 dev_info(&pdev->dev, "using PIO\n");
2443 host->prepare_data = &atmci_prepare_data;
2444 host->submit_data = &atmci_submit_data;
2445 host->stop_transfer = &atmci_stop_transfer;
2448 platform_set_drvdata(pdev, host);
2450 setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2452 /* We need at least one slot to succeed */
2455 if (pdata->slot[0].bus_width) {
2456 ret = atmci_init_slot(host, &pdata->slot[0],
2457 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2460 host->buf_size = host->slot[0]->mmc->max_req_size;
2463 if (pdata->slot[1].bus_width) {
2464 ret = atmci_init_slot(host, &pdata->slot[1],
2465 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2468 if (host->slot[1]->mmc->max_req_size > host->buf_size)
2470 host->slot[1]->mmc->max_req_size;
2475 dev_err(&pdev->dev, "init failed: no slot defined\n");
2479 if (!host->caps.has_rwproof) {
2480 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2481 &host->buf_phys_addr,
2483 if (!host->buffer) {
2485 dev_err(&pdev->dev, "buffer allocation failed\n");
2490 dev_info(&pdev->dev,
2491 "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2492 host->mapbase, irq, nr_slots);
2497 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2499 atmci_cleanup_slot(host->slot[i], i);
2502 del_timer_sync(&host->timer);
2504 dma_release_channel(host->dma.chan);
2505 free_irq(irq, host);
2509 static int __exit atmci_remove(struct platform_device *pdev)
2511 struct atmel_mci *host = platform_get_drvdata(pdev);
2515 dma_free_coherent(&pdev->dev, host->buf_size,
2516 host->buffer, host->buf_phys_addr);
2518 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2520 atmci_cleanup_slot(host->slot[i], i);
2523 clk_prepare_enable(host->mck);
2524 atmci_writel(host, ATMCI_IDR, ~0UL);
2525 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2526 atmci_readl(host, ATMCI_SR);
2527 clk_disable_unprepare(host->mck);
2529 del_timer_sync(&host->timer);
2531 dma_release_channel(host->dma.chan);
2533 free_irq(platform_get_irq(pdev, 0), host);
2538 static struct platform_driver atmci_driver = {
2539 .remove = __exit_p(atmci_remove),
2541 .name = "atmel_mci",
2542 .of_match_table = of_match_ptr(atmci_dt_ids),
2546 static int __init atmci_init(void)
2548 return platform_driver_probe(&atmci_driver, atmci_probe);
2551 static void __exit atmci_exit(void)
2553 platform_driver_unregister(&atmci_driver);
2556 late_initcall(atmci_init); /* try to load after dma driver when built-in */
2557 module_exit(atmci_exit);
2559 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2560 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2561 MODULE_LICENSE("GPL v2");