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>
22 #include <linux/platform_device.h>
23 #include <linux/scatterlist.h>
24 #include <linux/seq_file.h>
25 #include <linux/slab.h>
26 #include <linux/stat.h>
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/sdio.h>
31 #include <mach/atmel-mci.h>
32 #include <linux/atmel-mci.h>
33 #include <linux/atmel_pdc.h>
36 #include <asm/unaligned.h>
39 #include <mach/board.h>
41 #include "atmel-mci-regs.h"
43 #define ATMCI_DATA_ERROR_FLAGS (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
44 #define ATMCI_DMA_THRESHOLD 16
47 EVENT_CMD_COMPLETE = 0,
53 enum atmel_mci_state {
72 struct atmel_mci_caps {
81 struct atmel_mci_dma {
82 struct dma_chan *chan;
83 struct dma_async_tx_descriptor *data_desc;
87 * struct atmel_mci - MMC controller state shared between all slots
88 * @lock: Spinlock protecting the queue and associated data.
89 * @regs: Pointer to MMIO registers.
90 * @sg: Scatterlist entry currently being processed by PIO or PDC code.
91 * @pio_offset: Offset into the current scatterlist entry.
92 * @cur_slot: The slot which is currently using the controller.
93 * @mrq: The request currently being processed on @cur_slot,
94 * or NULL if the controller is idle.
95 * @cmd: The command currently being sent to the card, or NULL.
96 * @data: The data currently being transferred, or NULL if no data
97 * transfer is in progress.
98 * @data_size: just data->blocks * data->blksz.
99 * @dma: DMA client state.
100 * @data_chan: DMA channel being used for the current data transfer.
101 * @cmd_status: Snapshot of SR taken upon completion of the current
102 * command. Only valid when EVENT_CMD_COMPLETE is pending.
103 * @data_status: Snapshot of SR taken upon completion of the current
104 * data transfer. Only valid when EVENT_DATA_COMPLETE or
105 * EVENT_DATA_ERROR is pending.
106 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
108 * @tasklet: Tasklet running the request state machine.
109 * @pending_events: Bitmask of events flagged by the interrupt handler
110 * to be processed by the tasklet.
111 * @completed_events: Bitmask of events which the state machine has
113 * @state: Tasklet state.
114 * @queue: List of slots waiting for access to the controller.
115 * @need_clock_update: Update the clock rate before the next request.
116 * @need_reset: Reset controller before next request.
117 * @mode_reg: Value of the MR register.
118 * @cfg_reg: Value of the CFG register.
119 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
120 * rate and timeout calculations.
121 * @mapbase: Physical address of the MMIO registers.
122 * @mck: The peripheral bus clock hooked up to the MMC controller.
123 * @pdev: Platform device associated with the MMC controller.
124 * @slot: Slots sharing this MMC controller.
125 * @caps: MCI capabilities depending on MCI version.
126 * @prepare_data: function to setup MCI before data transfer which
127 * depends on MCI capabilities.
128 * @submit_data: function to start data transfer which depends on MCI
130 * @stop_transfer: function to stop data transfer which depends on MCI
136 * @lock is a softirq-safe spinlock protecting @queue as well as
137 * @cur_slot, @mrq and @state. These must always be updated
138 * at the same time while holding @lock.
140 * @lock also protects mode_reg and need_clock_update since these are
141 * used to synchronize mode register updates with the queue
144 * The @mrq field of struct atmel_mci_slot is also protected by @lock,
145 * and must always be written at the same time as the slot is added to
148 * @pending_events and @completed_events are accessed using atomic bit
149 * operations, so they don't need any locking.
151 * None of the fields touched by the interrupt handler need any
152 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
153 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
154 * interrupts must be disabled and @data_status updated with a
155 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
156 * CMDRDY interrupt must be disabled and @cmd_status updated with a
157 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
158 * bytes_xfered field of @data must be written. This is ensured by
165 struct scatterlist *sg;
166 unsigned int pio_offset;
168 struct atmel_mci_slot *cur_slot;
169 struct mmc_request *mrq;
170 struct mmc_command *cmd;
171 struct mmc_data *data;
172 unsigned int data_size;
174 struct atmel_mci_dma dma;
175 struct dma_chan *data_chan;
181 struct tasklet_struct tasklet;
182 unsigned long pending_events;
183 unsigned long completed_events;
184 enum atmel_mci_state state;
185 struct list_head queue;
187 bool need_clock_update;
191 unsigned long bus_hz;
192 unsigned long mapbase;
194 struct platform_device *pdev;
196 struct atmel_mci_slot *slot[ATMCI_MAX_NR_SLOTS];
198 struct atmel_mci_caps caps;
200 u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
201 void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
202 void (*stop_transfer)(struct atmel_mci *host);
206 * struct atmel_mci_slot - MMC slot state
207 * @mmc: The mmc_host representing this slot.
208 * @host: The MMC controller this slot is using.
209 * @sdc_reg: Value of SDCR to be written before using this slot.
210 * @sdio_irq: SDIO irq mask for this slot.
211 * @mrq: mmc_request currently being processed or waiting to be
212 * processed, or NULL when the slot is idle.
213 * @queue_node: List node for placing this node in the @queue list of
215 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
216 * @flags: Random state bits associated with the slot.
217 * @detect_pin: GPIO pin used for card detection, or negative if not
219 * @wp_pin: GPIO pin used for card write protect sending, or negative
221 * @detect_is_active_high: The state of the detect pin when it is active.
222 * @detect_timer: Timer used for debouncing @detect_pin interrupts.
224 struct atmel_mci_slot {
225 struct mmc_host *mmc;
226 struct atmel_mci *host;
231 struct mmc_request *mrq;
232 struct list_head queue_node;
236 #define ATMCI_CARD_PRESENT 0
237 #define ATMCI_CARD_NEED_INIT 1
238 #define ATMCI_SHUTDOWN 2
239 #define ATMCI_SUSPENDED 3
243 bool detect_is_active_high;
245 struct timer_list detect_timer;
248 #define atmci_test_and_clear_pending(host, event) \
249 test_and_clear_bit(event, &host->pending_events)
250 #define atmci_set_completed(host, event) \
251 set_bit(event, &host->completed_events)
252 #define atmci_set_pending(host, event) \
253 set_bit(event, &host->pending_events)
256 * The debugfs stuff below is mostly optimized away when
257 * CONFIG_DEBUG_FS is not set.
259 static int atmci_req_show(struct seq_file *s, void *v)
261 struct atmel_mci_slot *slot = s->private;
262 struct mmc_request *mrq;
263 struct mmc_command *cmd;
264 struct mmc_command *stop;
265 struct mmc_data *data;
267 /* Make sure we get a consistent snapshot */
268 spin_lock_bh(&slot->host->lock);
278 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
279 cmd->opcode, cmd->arg, cmd->flags,
280 cmd->resp[0], cmd->resp[1], cmd->resp[2],
281 cmd->resp[3], cmd->error);
283 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
284 data->bytes_xfered, data->blocks,
285 data->blksz, data->flags, data->error);
288 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
289 stop->opcode, stop->arg, stop->flags,
290 stop->resp[0], stop->resp[1], stop->resp[2],
291 stop->resp[3], stop->error);
294 spin_unlock_bh(&slot->host->lock);
299 static int atmci_req_open(struct inode *inode, struct file *file)
301 return single_open(file, atmci_req_show, inode->i_private);
304 static const struct file_operations atmci_req_fops = {
305 .owner = THIS_MODULE,
306 .open = atmci_req_open,
309 .release = single_release,
312 static void atmci_show_status_reg(struct seq_file *s,
313 const char *regname, u32 value)
315 static const char *sr_bit[] = {
346 seq_printf(s, "%s:\t0x%08x", regname, value);
347 for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
348 if (value & (1 << i)) {
350 seq_printf(s, " %s", sr_bit[i]);
352 seq_puts(s, " UNKNOWN");
358 static int atmci_regs_show(struct seq_file *s, void *v)
360 struct atmel_mci *host = s->private;
363 buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
368 * Grab a more or less consistent snapshot. Note that we're
369 * not disabling interrupts, so IMR and SR may not be
372 spin_lock_bh(&host->lock);
373 clk_enable(host->mck);
374 memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
375 clk_disable(host->mck);
376 spin_unlock_bh(&host->lock);
378 seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n",
380 buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
381 buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "",
382 buf[ATMCI_MR / 4] & 0xff);
383 seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
384 seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
385 seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
386 seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
388 buf[ATMCI_BLKR / 4] & 0xffff,
389 (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
390 if (host->caps.has_cstor_reg)
391 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
393 /* Don't read RSPR and RDR; it will consume the data there */
395 atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
396 atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
398 if (host->caps.has_dma) {
401 val = buf[ATMCI_DMA / 4];
402 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
405 1 << (((val >> 4) & 3) + 1) : 1,
406 val & ATMCI_DMAEN ? " DMAEN" : "");
408 if (host->caps.has_cfg_reg) {
411 val = buf[ATMCI_CFG / 4];
412 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
414 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
415 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
416 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
417 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
425 static int atmci_regs_open(struct inode *inode, struct file *file)
427 return single_open(file, atmci_regs_show, inode->i_private);
430 static const struct file_operations atmci_regs_fops = {
431 .owner = THIS_MODULE,
432 .open = atmci_regs_open,
435 .release = single_release,
438 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
440 struct mmc_host *mmc = slot->mmc;
441 struct atmel_mci *host = slot->host;
445 root = mmc->debugfs_root;
449 node = debugfs_create_file("regs", S_IRUSR, root, host,
456 node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
460 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
464 node = debugfs_create_x32("pending_events", S_IRUSR, root,
465 (u32 *)&host->pending_events);
469 node = debugfs_create_x32("completed_events", S_IRUSR, root,
470 (u32 *)&host->completed_events);
477 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
480 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
483 return (ns * (host->bus_hz / 1000000) + 999) / 1000;
486 static void atmci_set_timeout(struct atmel_mci *host,
487 struct atmel_mci_slot *slot, struct mmc_data *data)
489 static unsigned dtomul_to_shift[] = {
490 0, 4, 7, 8, 10, 12, 16, 20
496 timeout = atmci_ns_to_clocks(host, data->timeout_ns)
497 + data->timeout_clks;
499 for (dtomul = 0; dtomul < 8; dtomul++) {
500 unsigned shift = dtomul_to_shift[dtomul];
501 dtocyc = (timeout + (1 << shift) - 1) >> shift;
511 dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
512 dtocyc << dtomul_to_shift[dtomul]);
513 atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
517 * Return mask with command flags to be enabled for this command.
519 static u32 atmci_prepare_command(struct mmc_host *mmc,
520 struct mmc_command *cmd)
522 struct mmc_data *data;
525 cmd->error = -EINPROGRESS;
527 cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
529 if (cmd->flags & MMC_RSP_PRESENT) {
530 if (cmd->flags & MMC_RSP_136)
531 cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
533 cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
537 * This should really be MAXLAT_5 for CMD2 and ACMD41, but
538 * it's too difficult to determine whether this is an ACMD or
539 * not. Better make it 64.
541 cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
543 if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
544 cmdr |= ATMCI_CMDR_OPDCMD;
548 cmdr |= ATMCI_CMDR_START_XFER;
550 if (cmd->opcode == SD_IO_RW_EXTENDED) {
551 cmdr |= ATMCI_CMDR_SDIO_BLOCK;
553 if (data->flags & MMC_DATA_STREAM)
554 cmdr |= ATMCI_CMDR_STREAM;
555 else if (data->blocks > 1)
556 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
558 cmdr |= ATMCI_CMDR_BLOCK;
561 if (data->flags & MMC_DATA_READ)
562 cmdr |= ATMCI_CMDR_TRDIR_READ;
568 static void atmci_start_command(struct atmel_mci *host,
569 struct mmc_command *cmd, u32 cmd_flags)
574 dev_vdbg(&host->pdev->dev,
575 "start command: ARGR=0x%08x CMDR=0x%08x\n",
576 cmd->arg, cmd_flags);
578 atmci_writel(host, ATMCI_ARGR, cmd->arg);
579 atmci_writel(host, ATMCI_CMDR, cmd_flags);
582 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
584 atmci_start_command(host, data->stop, host->stop_cmdr);
585 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
589 * Configure given PDC buffer taking care of alignement issues.
590 * Update host->data_size and host->sg.
592 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
593 enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
595 u32 pointer_reg, counter_reg;
597 if (dir == XFER_RECEIVE) {
598 pointer_reg = ATMEL_PDC_RPR;
599 counter_reg = ATMEL_PDC_RCR;
601 pointer_reg = ATMEL_PDC_TPR;
602 counter_reg = ATMEL_PDC_TCR;
605 if (buf_nb == PDC_SECOND_BUF) {
610 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
611 if (host->data_size <= PAGE_SIZE) {
612 if (host->data_size & 0x3) {
613 /* If size is different from modulo 4, transfer bytes */
614 atmci_writel(host, counter_reg, host->data_size);
615 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
617 /* Else transfer 32-bits words */
618 atmci_writel(host, counter_reg, host->data_size / 4);
622 /* We assume the size of a page is 32-bits aligned */
623 atmci_writel(host, counter_reg, PAGE_SIZE / 4);
624 host->data_size -= PAGE_SIZE;
626 host->sg = sg_next(host->sg);
631 * Configure PDC buffer according to the data size ie configuring one or two
632 * buffers. Don't use this function if you want to configure only the second
633 * buffer. In this case, use atmci_pdc_set_single_buf.
635 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
637 atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
639 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
643 * Unmap sg lists, called when transfer is finished.
645 static void atmci_pdc_cleanup(struct atmel_mci *host)
647 struct mmc_data *data = host->data;
650 dma_unmap_sg(&host->pdev->dev,
651 data->sg, data->sg_len,
652 ((data->flags & MMC_DATA_WRITE)
653 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
657 * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
658 * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
659 * interrupt needed for both transfer directions.
661 static void atmci_pdc_complete(struct atmel_mci *host)
663 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
664 atmci_pdc_cleanup(host);
667 * If the card was removed, data will be NULL. No point trying
668 * to send the stop command or waiting for NBUSY in this case.
671 atmci_set_pending(host, EVENT_XFER_COMPLETE);
672 tasklet_schedule(&host->tasklet);
673 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
677 static void atmci_dma_cleanup(struct atmel_mci *host)
679 struct mmc_data *data = host->data;
682 dma_unmap_sg(host->dma.chan->device->dev,
683 data->sg, data->sg_len,
684 ((data->flags & MMC_DATA_WRITE)
685 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
689 * This function is called by the DMA driver from tasklet context.
691 static void atmci_dma_complete(void *arg)
693 struct atmel_mci *host = arg;
694 struct mmc_data *data = host->data;
696 dev_vdbg(&host->pdev->dev, "DMA complete\n");
698 if (host->caps.has_dma)
699 /* Disable DMA hardware handshaking on MCI */
700 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
702 atmci_dma_cleanup(host);
705 * If the card was removed, data will be NULL. No point trying
706 * to send the stop command or waiting for NBUSY in this case.
709 atmci_set_pending(host, EVENT_XFER_COMPLETE);
710 tasklet_schedule(&host->tasklet);
713 * Regardless of what the documentation says, we have
714 * to wait for NOTBUSY even after block read
717 * When the DMA transfer is complete, the controller
718 * may still be reading the CRC from the card, i.e.
719 * the data transfer is still in progress and we
720 * haven't seen all the potential error bits yet.
722 * The interrupt handler will schedule a different
723 * tasklet to finish things up when the data transfer
724 * is completely done.
726 * We may not complete the mmc request here anyway
727 * because the mmc layer may call back and cause us to
728 * violate the "don't submit new operations from the
729 * completion callback" rule of the dma engine
732 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
737 * Returns a mask of interrupt flags to be enabled after the whole
738 * request has been prepared.
740 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
744 data->error = -EINPROGRESS;
748 host->data_chan = NULL;
750 iflags = ATMCI_DATA_ERROR_FLAGS;
753 * Errata: MMC data write operation with less than 12
754 * bytes is impossible.
756 * Errata: MCI Transmit Data Register (TDR) FIFO
757 * corruption when length is not multiple of 4.
759 if (data->blocks * data->blksz < 12
760 || (data->blocks * data->blksz) & 3)
761 host->need_reset = true;
763 host->pio_offset = 0;
764 if (data->flags & MMC_DATA_READ)
765 iflags |= ATMCI_RXRDY;
767 iflags |= ATMCI_TXRDY;
773 * Set interrupt flags and set block length into the MCI mode register even
774 * if this value is also accessible in the MCI block register. It seems to be
775 * necessary before the High Speed MCI version. It also map sg and configure
779 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
783 enum dma_data_direction dir;
785 data->error = -EINPROGRESS;
789 iflags = ATMCI_DATA_ERROR_FLAGS;
791 /* Enable pdc mode */
792 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
794 if (data->flags & MMC_DATA_READ) {
795 dir = DMA_FROM_DEVICE;
796 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
799 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE;
803 tmp = atmci_readl(host, ATMCI_MR);
805 tmp |= ATMCI_BLKLEN(data->blksz);
806 atmci_writel(host, ATMCI_MR, tmp);
809 host->data_size = data->blocks * data->blksz;
810 sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
811 BUG_ON(sg_len < host->data_size / PAGE_SIZE);
813 atmci_pdc_set_both_buf(host,
814 ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
820 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
822 struct dma_chan *chan;
823 struct dma_async_tx_descriptor *desc;
824 struct scatterlist *sg;
826 enum dma_data_direction direction;
830 data->error = -EINPROGRESS;
836 iflags = ATMCI_DATA_ERROR_FLAGS;
839 * We don't do DMA on "complex" transfers, i.e. with
840 * non-word-aligned buffers or lengths. Also, we don't bother
841 * with all the DMA setup overhead for short transfers.
843 if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
844 return atmci_prepare_data(host, data);
846 return atmci_prepare_data(host, data);
848 for_each_sg(data->sg, sg, data->sg_len, i) {
849 if (sg->offset & 3 || sg->length & 3)
850 return atmci_prepare_data(host, data);
853 /* If we don't have a channel, we can't do DMA */
854 chan = host->dma.chan;
856 host->data_chan = chan;
861 if (host->caps.has_dma)
862 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(3) | ATMCI_DMAEN);
864 if (data->flags & MMC_DATA_READ)
865 direction = DMA_FROM_DEVICE;
867 direction = DMA_TO_DEVICE;
869 sglen = dma_map_sg(chan->device->dev, data->sg,
870 data->sg_len, direction);
872 desc = chan->device->device_prep_slave_sg(chan,
873 data->sg, sglen, direction,
874 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
878 host->dma.data_desc = desc;
879 desc->callback = atmci_dma_complete;
880 desc->callback_param = host;
884 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
889 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
895 * Start PDC according to transfer direction.
898 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
900 if (data->flags & MMC_DATA_READ)
901 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
903 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
907 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
909 struct dma_chan *chan = host->data_chan;
910 struct dma_async_tx_descriptor *desc = host->dma.data_desc;
913 dmaengine_submit(desc);
914 dma_async_issue_pending(chan);
918 static void atmci_stop_transfer(struct atmel_mci *host)
920 atmci_set_pending(host, EVENT_XFER_COMPLETE);
921 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
925 * Stop data transfer because error(s) occured.
927 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
929 atmci_set_pending(host, EVENT_XFER_COMPLETE);
930 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
933 static void atmci_stop_transfer_dma(struct atmel_mci *host)
935 struct dma_chan *chan = host->data_chan;
938 dmaengine_terminate_all(chan);
939 atmci_dma_cleanup(host);
941 /* Data transfer was stopped by the interrupt handler */
942 atmci_set_pending(host, EVENT_XFER_COMPLETE);
943 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
948 * Start a request: prepare data if needed, prepare the command and activate
951 static void atmci_start_request(struct atmel_mci *host,
952 struct atmel_mci_slot *slot)
954 struct mmc_request *mrq;
955 struct mmc_command *cmd;
956 struct mmc_data *data;
961 host->cur_slot = slot;
964 host->pending_events = 0;
965 host->completed_events = 0;
966 host->data_status = 0;
968 if (host->need_reset) {
969 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
970 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
971 atmci_writel(host, ATMCI_MR, host->mode_reg);
972 if (host->caps.has_cfg_reg)
973 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
974 host->need_reset = false;
976 atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
978 iflags = atmci_readl(host, ATMCI_IMR);
979 if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
980 dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
983 if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
984 /* Send init sequence (74 clock cycles) */
985 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
986 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
992 atmci_set_timeout(host, slot, data);
994 /* Must set block count/size before sending command */
995 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
996 | ATMCI_BLKLEN(data->blksz));
997 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
998 ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1000 iflags |= host->prepare_data(host, data);
1003 iflags |= ATMCI_CMDRDY;
1005 cmdflags = atmci_prepare_command(slot->mmc, cmd);
1006 atmci_start_command(host, cmd, cmdflags);
1009 host->submit_data(host, data);
1012 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1013 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1014 if (!(data->flags & MMC_DATA_WRITE))
1015 host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1016 if (data->flags & MMC_DATA_STREAM)
1017 host->stop_cmdr |= ATMCI_CMDR_STREAM;
1019 host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1023 * We could have enabled interrupts earlier, but I suspect
1024 * that would open up a nice can of interesting race
1025 * conditions (e.g. command and data complete, but stop not
1028 atmci_writel(host, ATMCI_IER, iflags);
1031 static void atmci_queue_request(struct atmel_mci *host,
1032 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1034 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1037 spin_lock_bh(&host->lock);
1039 if (host->state == STATE_IDLE) {
1040 host->state = STATE_SENDING_CMD;
1041 atmci_start_request(host, slot);
1043 list_add_tail(&slot->queue_node, &host->queue);
1045 spin_unlock_bh(&host->lock);
1048 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1050 struct atmel_mci_slot *slot = mmc_priv(mmc);
1051 struct atmel_mci *host = slot->host;
1052 struct mmc_data *data;
1057 * We may "know" the card is gone even though there's still an
1058 * electrical connection. If so, we really need to communicate
1059 * this to the MMC core since there won't be any more
1060 * interrupts as the card is completely removed. Otherwise,
1061 * the MMC core might believe the card is still there even
1062 * though the card was just removed very slowly.
1064 if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1065 mrq->cmd->error = -ENOMEDIUM;
1066 mmc_request_done(mmc, mrq);
1070 /* We don't support multiple blocks of weird lengths. */
1072 if (data && data->blocks > 1 && data->blksz & 3) {
1073 mrq->cmd->error = -EINVAL;
1074 mmc_request_done(mmc, mrq);
1077 atmci_queue_request(host, slot, mrq);
1080 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1082 struct atmel_mci_slot *slot = mmc_priv(mmc);
1083 struct atmel_mci *host = slot->host;
1086 slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1087 switch (ios->bus_width) {
1088 case MMC_BUS_WIDTH_1:
1089 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1091 case MMC_BUS_WIDTH_4:
1092 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1097 unsigned int clock_min = ~0U;
1100 spin_lock_bh(&host->lock);
1101 if (!host->mode_reg) {
1102 clk_enable(host->mck);
1103 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1104 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1105 if (host->caps.has_cfg_reg)
1106 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1110 * Use mirror of ios->clock to prevent race with mmc
1111 * core ios update when finding the minimum.
1113 slot->clock = ios->clock;
1114 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1115 if (host->slot[i] && host->slot[i]->clock
1116 && host->slot[i]->clock < clock_min)
1117 clock_min = host->slot[i]->clock;
1120 /* Calculate clock divider */
1121 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1123 dev_warn(&mmc->class_dev,
1124 "clock %u too slow; using %lu\n",
1125 clock_min, host->bus_hz / (2 * 256));
1129 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1132 * WRPROOF and RDPROOF prevent overruns/underruns by
1133 * stopping the clock when the FIFO is full/empty.
1134 * This state is not expected to last for long.
1136 if (host->caps.has_rwproof)
1137 host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1139 if (host->caps.has_cfg_reg) {
1140 /* setup High Speed mode in relation with card capacity */
1141 if (ios->timing == MMC_TIMING_SD_HS)
1142 host->cfg_reg |= ATMCI_CFG_HSMODE;
1144 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1147 if (list_empty(&host->queue)) {
1148 atmci_writel(host, ATMCI_MR, host->mode_reg);
1149 if (host->caps.has_cfg_reg)
1150 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1152 host->need_clock_update = true;
1155 spin_unlock_bh(&host->lock);
1157 bool any_slot_active = false;
1159 spin_lock_bh(&host->lock);
1161 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1162 if (host->slot[i] && host->slot[i]->clock) {
1163 any_slot_active = true;
1167 if (!any_slot_active) {
1168 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1169 if (host->mode_reg) {
1170 atmci_readl(host, ATMCI_MR);
1171 clk_disable(host->mck);
1175 spin_unlock_bh(&host->lock);
1178 switch (ios->power_mode) {
1180 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1184 * TODO: None of the currently available AVR32-based
1185 * boards allow MMC power to be turned off. Implement
1186 * power control when this can be tested properly.
1188 * We also need to hook this into the clock management
1189 * somehow so that newly inserted cards aren't
1190 * subjected to a fast clock before we have a chance
1191 * to figure out what the maximum rate is. Currently,
1192 * there's no way to avoid this, and there never will
1193 * be for boards that don't support power control.
1199 static int atmci_get_ro(struct mmc_host *mmc)
1201 int read_only = -ENOSYS;
1202 struct atmel_mci_slot *slot = mmc_priv(mmc);
1204 if (gpio_is_valid(slot->wp_pin)) {
1205 read_only = gpio_get_value(slot->wp_pin);
1206 dev_dbg(&mmc->class_dev, "card is %s\n",
1207 read_only ? "read-only" : "read-write");
1213 static int atmci_get_cd(struct mmc_host *mmc)
1215 int present = -ENOSYS;
1216 struct atmel_mci_slot *slot = mmc_priv(mmc);
1218 if (gpio_is_valid(slot->detect_pin)) {
1219 present = !(gpio_get_value(slot->detect_pin) ^
1220 slot->detect_is_active_high);
1221 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1222 present ? "" : "not ");
1228 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1230 struct atmel_mci_slot *slot = mmc_priv(mmc);
1231 struct atmel_mci *host = slot->host;
1234 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1236 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1239 static const struct mmc_host_ops atmci_ops = {
1240 .request = atmci_request,
1241 .set_ios = atmci_set_ios,
1242 .get_ro = atmci_get_ro,
1243 .get_cd = atmci_get_cd,
1244 .enable_sdio_irq = atmci_enable_sdio_irq,
1247 /* Called with host->lock held */
1248 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1249 __releases(&host->lock)
1250 __acquires(&host->lock)
1252 struct atmel_mci_slot *slot = NULL;
1253 struct mmc_host *prev_mmc = host->cur_slot->mmc;
1255 WARN_ON(host->cmd || host->data);
1258 * Update the MMC clock rate if necessary. This may be
1259 * necessary if set_ios() is called when a different slot is
1260 * busy transferring data.
1262 if (host->need_clock_update) {
1263 atmci_writel(host, ATMCI_MR, host->mode_reg);
1264 if (host->caps.has_cfg_reg)
1265 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1268 host->cur_slot->mrq = NULL;
1270 if (!list_empty(&host->queue)) {
1271 slot = list_entry(host->queue.next,
1272 struct atmel_mci_slot, queue_node);
1273 list_del(&slot->queue_node);
1274 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1275 mmc_hostname(slot->mmc));
1276 host->state = STATE_SENDING_CMD;
1277 atmci_start_request(host, slot);
1279 dev_vdbg(&host->pdev->dev, "list empty\n");
1280 host->state = STATE_IDLE;
1283 spin_unlock(&host->lock);
1284 mmc_request_done(prev_mmc, mrq);
1285 spin_lock(&host->lock);
1288 static void atmci_command_complete(struct atmel_mci *host,
1289 struct mmc_command *cmd)
1291 u32 status = host->cmd_status;
1293 /* Read the response from the card (up to 16 bytes) */
1294 cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1295 cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1296 cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1297 cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1299 if (status & ATMCI_RTOE)
1300 cmd->error = -ETIMEDOUT;
1301 else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1302 cmd->error = -EILSEQ;
1303 else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1309 dev_dbg(&host->pdev->dev,
1310 "command error: status=0x%08x\n", status);
1313 host->stop_transfer(host);
1315 atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY
1316 | ATMCI_TXRDY | ATMCI_RXRDY
1317 | ATMCI_DATA_ERROR_FLAGS);
1322 static void atmci_detect_change(unsigned long data)
1324 struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data;
1329 * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1330 * freeing the interrupt. We must not re-enable the interrupt
1331 * if it has been freed, and if we're shutting down, it
1332 * doesn't really matter whether the card is present or not.
1335 if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1338 enable_irq(gpio_to_irq(slot->detect_pin));
1339 present = !(gpio_get_value(slot->detect_pin) ^
1340 slot->detect_is_active_high);
1341 present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1343 dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1344 present, present_old);
1346 if (present != present_old) {
1347 struct atmel_mci *host = slot->host;
1348 struct mmc_request *mrq;
1350 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1351 present ? "inserted" : "removed");
1353 spin_lock(&host->lock);
1356 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1358 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1360 /* Clean up queue if present */
1363 if (mrq == host->mrq) {
1365 * Reset controller to terminate any ongoing
1366 * commands or data transfers.
1368 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1369 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1370 atmci_writel(host, ATMCI_MR, host->mode_reg);
1371 if (host->caps.has_cfg_reg)
1372 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1377 switch (host->state) {
1380 case STATE_SENDING_CMD:
1381 mrq->cmd->error = -ENOMEDIUM;
1385 case STATE_SENDING_DATA:
1386 mrq->data->error = -ENOMEDIUM;
1387 host->stop_transfer(host);
1389 case STATE_DATA_BUSY:
1390 case STATE_DATA_ERROR:
1391 if (mrq->data->error == -EINPROGRESS)
1392 mrq->data->error = -ENOMEDIUM;
1396 case STATE_SENDING_STOP:
1397 mrq->stop->error = -ENOMEDIUM;
1401 atmci_request_end(host, mrq);
1403 list_del(&slot->queue_node);
1404 mrq->cmd->error = -ENOMEDIUM;
1406 mrq->data->error = -ENOMEDIUM;
1408 mrq->stop->error = -ENOMEDIUM;
1410 spin_unlock(&host->lock);
1411 mmc_request_done(slot->mmc, mrq);
1412 spin_lock(&host->lock);
1415 spin_unlock(&host->lock);
1417 mmc_detect_change(slot->mmc, 0);
1421 static void atmci_tasklet_func(unsigned long priv)
1423 struct atmel_mci *host = (struct atmel_mci *)priv;
1424 struct mmc_request *mrq = host->mrq;
1425 struct mmc_data *data = host->data;
1426 struct mmc_command *cmd = host->cmd;
1427 enum atmel_mci_state state = host->state;
1428 enum atmel_mci_state prev_state;
1431 spin_lock(&host->lock);
1433 state = host->state;
1435 dev_vdbg(&host->pdev->dev,
1436 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1437 state, host->pending_events, host->completed_events,
1438 atmci_readl(host, ATMCI_IMR));
1447 case STATE_SENDING_CMD:
1448 if (!atmci_test_and_clear_pending(host,
1449 EVENT_CMD_COMPLETE))
1453 atmci_set_completed(host, EVENT_CMD_COMPLETE);
1454 atmci_command_complete(host, mrq->cmd);
1455 if (!mrq->data || cmd->error) {
1456 atmci_request_end(host, host->mrq);
1460 prev_state = state = STATE_SENDING_DATA;
1463 case STATE_SENDING_DATA:
1464 if (atmci_test_and_clear_pending(host,
1465 EVENT_DATA_ERROR)) {
1466 host->stop_transfer(host);
1468 atmci_send_stop_cmd(host, data);
1469 state = STATE_DATA_ERROR;
1473 if (!atmci_test_and_clear_pending(host,
1474 EVENT_XFER_COMPLETE))
1477 atmci_set_completed(host, EVENT_XFER_COMPLETE);
1478 prev_state = state = STATE_DATA_BUSY;
1481 case STATE_DATA_BUSY:
1482 if (!atmci_test_and_clear_pending(host,
1483 EVENT_DATA_COMPLETE))
1487 atmci_set_completed(host, EVENT_DATA_COMPLETE);
1488 status = host->data_status;
1489 if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) {
1490 if (status & ATMCI_DTOE) {
1491 dev_dbg(&host->pdev->dev,
1492 "data timeout error\n");
1493 data->error = -ETIMEDOUT;
1494 } else if (status & ATMCI_DCRCE) {
1495 dev_dbg(&host->pdev->dev,
1496 "data CRC error\n");
1497 data->error = -EILSEQ;
1499 dev_dbg(&host->pdev->dev,
1500 "data FIFO error (status=%08x)\n",
1505 data->bytes_xfered = data->blocks * data->blksz;
1507 atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS);
1511 atmci_request_end(host, host->mrq);
1515 prev_state = state = STATE_SENDING_STOP;
1517 atmci_send_stop_cmd(host, data);
1520 case STATE_SENDING_STOP:
1521 if (!atmci_test_and_clear_pending(host,
1522 EVENT_CMD_COMPLETE))
1526 atmci_command_complete(host, mrq->stop);
1527 atmci_request_end(host, host->mrq);
1530 case STATE_DATA_ERROR:
1531 if (!atmci_test_and_clear_pending(host,
1532 EVENT_XFER_COMPLETE))
1535 state = STATE_DATA_BUSY;
1538 } while (state != prev_state);
1540 host->state = state;
1543 spin_unlock(&host->lock);
1546 static void atmci_read_data_pio(struct atmel_mci *host)
1548 struct scatterlist *sg = host->sg;
1549 void *buf = sg_virt(sg);
1550 unsigned int offset = host->pio_offset;
1551 struct mmc_data *data = host->data;
1554 unsigned int nbytes = 0;
1557 value = atmci_readl(host, ATMCI_RDR);
1558 if (likely(offset + 4 <= sg->length)) {
1559 put_unaligned(value, (u32 *)(buf + offset));
1564 if (offset == sg->length) {
1565 flush_dcache_page(sg_page(sg));
1566 host->sg = sg = sg_next(sg);
1574 unsigned int remaining = sg->length - offset;
1575 memcpy(buf + offset, &value, remaining);
1576 nbytes += remaining;
1578 flush_dcache_page(sg_page(sg));
1579 host->sg = sg = sg_next(sg);
1583 offset = 4 - remaining;
1585 memcpy(buf, (u8 *)&value + remaining, offset);
1589 status = atmci_readl(host, ATMCI_SR);
1590 if (status & ATMCI_DATA_ERROR_FLAGS) {
1591 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1592 | ATMCI_DATA_ERROR_FLAGS));
1593 host->data_status = status;
1594 data->bytes_xfered += nbytes;
1596 atmci_set_pending(host, EVENT_DATA_ERROR);
1597 tasklet_schedule(&host->tasklet);
1600 } while (status & ATMCI_RXRDY);
1602 host->pio_offset = offset;
1603 data->bytes_xfered += nbytes;
1608 atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1609 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1610 data->bytes_xfered += nbytes;
1612 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1615 static void atmci_write_data_pio(struct atmel_mci *host)
1617 struct scatterlist *sg = host->sg;
1618 void *buf = sg_virt(sg);
1619 unsigned int offset = host->pio_offset;
1620 struct mmc_data *data = host->data;
1623 unsigned int nbytes = 0;
1626 if (likely(offset + 4 <= sg->length)) {
1627 value = get_unaligned((u32 *)(buf + offset));
1628 atmci_writel(host, ATMCI_TDR, value);
1632 if (offset == sg->length) {
1633 host->sg = sg = sg_next(sg);
1641 unsigned int remaining = sg->length - offset;
1644 memcpy(&value, buf + offset, remaining);
1645 nbytes += remaining;
1647 host->sg = sg = sg_next(sg);
1649 atmci_writel(host, ATMCI_TDR, value);
1653 offset = 4 - remaining;
1655 memcpy((u8 *)&value + remaining, buf, offset);
1656 atmci_writel(host, ATMCI_TDR, value);
1660 status = atmci_readl(host, ATMCI_SR);
1661 if (status & ATMCI_DATA_ERROR_FLAGS) {
1662 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1663 | ATMCI_DATA_ERROR_FLAGS));
1664 host->data_status = status;
1665 data->bytes_xfered += nbytes;
1667 atmci_set_pending(host, EVENT_DATA_ERROR);
1668 tasklet_schedule(&host->tasklet);
1671 } while (status & ATMCI_TXRDY);
1673 host->pio_offset = offset;
1674 data->bytes_xfered += nbytes;
1679 atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1680 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1681 data->bytes_xfered += nbytes;
1683 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1686 static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
1688 atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
1690 host->cmd_status = status;
1692 atmci_set_pending(host, EVENT_CMD_COMPLETE);
1693 tasklet_schedule(&host->tasklet);
1696 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1700 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1701 struct atmel_mci_slot *slot = host->slot[i];
1702 if (slot && (status & slot->sdio_irq)) {
1703 mmc_signal_sdio_irq(slot->mmc);
1709 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1711 struct atmel_mci *host = dev_id;
1712 u32 status, mask, pending;
1713 unsigned int pass_count = 0;
1716 status = atmci_readl(host, ATMCI_SR);
1717 mask = atmci_readl(host, ATMCI_IMR);
1718 pending = status & mask;
1722 if (pending & ATMCI_DATA_ERROR_FLAGS) {
1723 atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
1724 | ATMCI_RXRDY | ATMCI_TXRDY);
1725 pending &= atmci_readl(host, ATMCI_IMR);
1727 host->data_status = status;
1729 atmci_set_pending(host, EVENT_DATA_ERROR);
1730 tasklet_schedule(&host->tasklet);
1733 if (pending & ATMCI_ENDTX) {
1734 atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
1735 if (host->data_size) {
1736 atmci_pdc_set_single_buf(host,
1737 XFER_TRANSMIT, PDC_SECOND_BUF);
1738 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
1742 if (pending & ATMCI_TXBUFE) {
1743 atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
1745 * We can receive this interruption before having configured
1746 * the second pdc buffer, so we need to reconfigure first and
1747 * second buffers again
1749 if (host->data_size) {
1750 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
1751 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
1753 atmci_pdc_complete(host);
1757 if (pending & ATMCI_ENDRX) {
1758 atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
1760 if (host->data_size) {
1761 atmci_pdc_set_single_buf(host,
1762 XFER_RECEIVE, PDC_SECOND_BUF);
1763 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
1767 if (pending & ATMCI_RXBUFF) {
1768 atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
1770 * We can receive this interruption before having configured
1771 * the second pdc buffer, so we need to reconfigure first and
1772 * second buffers again
1774 if (host->data_size) {
1775 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
1776 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
1778 atmci_pdc_complete(host);
1782 if (pending & ATMCI_NOTBUSY) {
1783 atmci_writel(host, ATMCI_IDR,
1784 ATMCI_DATA_ERROR_FLAGS | ATMCI_NOTBUSY);
1785 if (!host->data_status)
1786 host->data_status = status;
1788 atmci_set_pending(host, EVENT_DATA_COMPLETE);
1789 tasklet_schedule(&host->tasklet);
1791 if (pending & ATMCI_RXRDY)
1792 atmci_read_data_pio(host);
1793 if (pending & ATMCI_TXRDY)
1794 atmci_write_data_pio(host);
1796 if (pending & ATMCI_CMDRDY)
1797 atmci_cmd_interrupt(host, status);
1799 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1800 atmci_sdio_interrupt(host, status);
1802 } while (pass_count++ < 5);
1804 return pass_count ? IRQ_HANDLED : IRQ_NONE;
1807 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
1809 struct atmel_mci_slot *slot = dev_id;
1812 * Disable interrupts until the pin has stabilized and check
1813 * the state then. Use mod_timer() since we may be in the
1814 * middle of the timer routine when this interrupt triggers.
1816 disable_irq_nosync(irq);
1817 mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
1822 static int __init atmci_init_slot(struct atmel_mci *host,
1823 struct mci_slot_pdata *slot_data, unsigned int id,
1824 u32 sdc_reg, u32 sdio_irq)
1826 struct mmc_host *mmc;
1827 struct atmel_mci_slot *slot;
1829 mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
1833 slot = mmc_priv(mmc);
1836 slot->detect_pin = slot_data->detect_pin;
1837 slot->wp_pin = slot_data->wp_pin;
1838 slot->detect_is_active_high = slot_data->detect_is_active_high;
1839 slot->sdc_reg = sdc_reg;
1840 slot->sdio_irq = sdio_irq;
1842 mmc->ops = &atmci_ops;
1843 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
1844 mmc->f_max = host->bus_hz / 2;
1845 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1847 mmc->caps |= MMC_CAP_SDIO_IRQ;
1848 if (host->caps.has_highspeed)
1849 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1850 if (slot_data->bus_width >= 4)
1851 mmc->caps |= MMC_CAP_4_BIT_DATA;
1854 mmc->max_req_size = 32768 * 512;
1855 mmc->max_blk_size = 32768;
1856 mmc->max_blk_count = 512;
1858 /* Assume card is present initially */
1859 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1860 if (gpio_is_valid(slot->detect_pin)) {
1861 if (gpio_request(slot->detect_pin, "mmc_detect")) {
1862 dev_dbg(&mmc->class_dev, "no detect pin available\n");
1863 slot->detect_pin = -EBUSY;
1864 } else if (gpio_get_value(slot->detect_pin) ^
1865 slot->detect_is_active_high) {
1866 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1870 if (!gpio_is_valid(slot->detect_pin))
1871 mmc->caps |= MMC_CAP_NEEDS_POLL;
1873 if (gpio_is_valid(slot->wp_pin)) {
1874 if (gpio_request(slot->wp_pin, "mmc_wp")) {
1875 dev_dbg(&mmc->class_dev, "no WP pin available\n");
1876 slot->wp_pin = -EBUSY;
1880 host->slot[id] = slot;
1883 if (gpio_is_valid(slot->detect_pin)) {
1886 setup_timer(&slot->detect_timer, atmci_detect_change,
1887 (unsigned long)slot);
1889 ret = request_irq(gpio_to_irq(slot->detect_pin),
1890 atmci_detect_interrupt,
1891 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
1892 "mmc-detect", slot);
1894 dev_dbg(&mmc->class_dev,
1895 "could not request IRQ %d for detect pin\n",
1896 gpio_to_irq(slot->detect_pin));
1897 gpio_free(slot->detect_pin);
1898 slot->detect_pin = -EBUSY;
1902 atmci_init_debugfs(slot);
1907 static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
1910 /* Debugfs stuff is cleaned up by mmc core */
1912 set_bit(ATMCI_SHUTDOWN, &slot->flags);
1915 mmc_remove_host(slot->mmc);
1917 if (gpio_is_valid(slot->detect_pin)) {
1918 int pin = slot->detect_pin;
1920 free_irq(gpio_to_irq(pin), slot);
1921 del_timer_sync(&slot->detect_timer);
1924 if (gpio_is_valid(slot->wp_pin))
1925 gpio_free(slot->wp_pin);
1927 slot->host->slot[id] = NULL;
1928 mmc_free_host(slot->mmc);
1931 static bool atmci_filter(struct dma_chan *chan, void *slave)
1933 struct mci_dma_data *sl = slave;
1935 if (sl && find_slave_dev(sl) == chan->device->dev) {
1936 chan->private = slave_data_ptr(sl);
1943 static void atmci_configure_dma(struct atmel_mci *host)
1945 struct mci_platform_data *pdata;
1950 pdata = host->pdev->dev.platform_data;
1952 if (pdata && find_slave_dev(pdata->dma_slave)) {
1953 dma_cap_mask_t mask;
1955 setup_dma_addr(pdata->dma_slave,
1956 host->mapbase + ATMCI_TDR,
1957 host->mapbase + ATMCI_RDR);
1959 /* Try to grab a DMA channel */
1961 dma_cap_set(DMA_SLAVE, mask);
1963 dma_request_channel(mask, atmci_filter, pdata->dma_slave);
1965 if (!host->dma.chan)
1966 dev_notice(&host->pdev->dev, "DMA not available, using PIO\n");
1968 dev_info(&host->pdev->dev,
1969 "Using %s for DMA transfers\n",
1970 dma_chan_name(host->dma.chan));
1973 static inline unsigned int atmci_get_version(struct atmel_mci *host)
1975 return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
1979 * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
1980 * HSMCI provides DMA support and a new config register but no more supports
1983 static void __init atmci_get_cap(struct atmel_mci *host)
1985 unsigned int version;
1987 version = atmci_get_version(host);
1988 dev_info(&host->pdev->dev,
1989 "version: 0x%x\n", version);
1991 host->caps.has_dma = 0;
1992 host->caps.has_pdc = 0;
1993 host->caps.has_cfg_reg = 0;
1994 host->caps.has_cstor_reg = 0;
1995 host->caps.has_highspeed = 0;
1996 host->caps.has_rwproof = 0;
1998 /* keep only major version number */
1999 switch (version & 0xf00) {
2002 host->caps.has_pdc = 1;
2003 host->caps.has_rwproof = 1;
2008 #ifdef CONFIG_AT_HDMAC
2009 host->caps.has_dma = 1;
2011 host->caps.has_dma = 0;
2012 dev_info(&host->pdev->dev,
2013 "has dma capability but dma engine is not selected, then use pio\n");
2015 host->caps.has_cfg_reg = 1;
2016 host->caps.has_cstor_reg = 1;
2017 host->caps.has_highspeed = 1;
2018 host->caps.has_rwproof = 1;
2021 dev_warn(&host->pdev->dev,
2022 "Unmanaged mci version, set minimum capabilities\n");
2027 static int __init atmci_probe(struct platform_device *pdev)
2029 struct mci_platform_data *pdata;
2030 struct atmel_mci *host;
2031 struct resource *regs;
2032 unsigned int nr_slots;
2036 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2039 pdata = pdev->dev.platform_data;
2042 irq = platform_get_irq(pdev, 0);
2046 host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL);
2051 spin_lock_init(&host->lock);
2052 INIT_LIST_HEAD(&host->queue);
2054 host->mck = clk_get(&pdev->dev, "mci_clk");
2055 if (IS_ERR(host->mck)) {
2056 ret = PTR_ERR(host->mck);
2061 host->regs = ioremap(regs->start, resource_size(regs));
2065 clk_enable(host->mck);
2066 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2067 host->bus_hz = clk_get_rate(host->mck);
2068 clk_disable(host->mck);
2070 host->mapbase = regs->start;
2072 tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2074 ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2076 goto err_request_irq;
2078 /* Get MCI capabilities and set operations according to it */
2079 atmci_get_cap(host);
2080 if (host->caps.has_dma) {
2081 dev_info(&pdev->dev, "using DMA\n");
2082 host->prepare_data = &atmci_prepare_data_dma;
2083 host->submit_data = &atmci_submit_data_dma;
2084 host->stop_transfer = &atmci_stop_transfer_dma;
2085 } else if (host->caps.has_pdc) {
2086 dev_info(&pdev->dev, "using PDC\n");
2087 host->prepare_data = &atmci_prepare_data_pdc;
2088 host->submit_data = &atmci_submit_data_pdc;
2089 host->stop_transfer = &atmci_stop_transfer_pdc;
2091 dev_info(&pdev->dev, "no DMA, no PDC\n");
2092 host->prepare_data = &atmci_prepare_data;
2093 host->submit_data = &atmci_submit_data;
2094 host->stop_transfer = &atmci_stop_transfer;
2097 if (host->caps.has_dma)
2098 atmci_configure_dma(host);
2100 platform_set_drvdata(pdev, host);
2102 /* We need at least one slot to succeed */
2105 if (pdata->slot[0].bus_width) {
2106 ret = atmci_init_slot(host, &pdata->slot[0],
2107 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2111 if (pdata->slot[1].bus_width) {
2112 ret = atmci_init_slot(host, &pdata->slot[1],
2113 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2119 dev_err(&pdev->dev, "init failed: no slot defined\n");
2123 dev_info(&pdev->dev,
2124 "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2125 host->mapbase, irq, nr_slots);
2131 dma_release_channel(host->dma.chan);
2132 free_irq(irq, host);
2134 iounmap(host->regs);
2142 static int __exit atmci_remove(struct platform_device *pdev)
2144 struct atmel_mci *host = platform_get_drvdata(pdev);
2147 platform_set_drvdata(pdev, NULL);
2149 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2151 atmci_cleanup_slot(host->slot[i], i);
2154 clk_enable(host->mck);
2155 atmci_writel(host, ATMCI_IDR, ~0UL);
2156 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2157 atmci_readl(host, ATMCI_SR);
2158 clk_disable(host->mck);
2160 #ifdef CONFIG_MMC_ATMELMCI_DMA
2162 dma_release_channel(host->dma.chan);
2165 free_irq(platform_get_irq(pdev, 0), host);
2166 iounmap(host->regs);
2175 static int atmci_suspend(struct device *dev)
2177 struct atmel_mci *host = dev_get_drvdata(dev);
2180 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2181 struct atmel_mci_slot *slot = host->slot[i];
2186 ret = mmc_suspend_host(slot->mmc);
2189 slot = host->slot[i];
2191 && test_bit(ATMCI_SUSPENDED, &slot->flags)) {
2192 mmc_resume_host(host->slot[i]->mmc);
2193 clear_bit(ATMCI_SUSPENDED, &slot->flags);
2198 set_bit(ATMCI_SUSPENDED, &slot->flags);
2205 static int atmci_resume(struct device *dev)
2207 struct atmel_mci *host = dev_get_drvdata(dev);
2211 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2212 struct atmel_mci_slot *slot = host->slot[i];
2215 slot = host->slot[i];
2218 if (!test_bit(ATMCI_SUSPENDED, &slot->flags))
2220 err = mmc_resume_host(slot->mmc);
2224 clear_bit(ATMCI_SUSPENDED, &slot->flags);
2229 static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume);
2230 #define ATMCI_PM_OPS (&atmci_pm)
2232 #define ATMCI_PM_OPS NULL
2235 static struct platform_driver atmci_driver = {
2236 .remove = __exit_p(atmci_remove),
2238 .name = "atmel_mci",
2243 static int __init atmci_init(void)
2245 return platform_driver_probe(&atmci_driver, atmci_probe);
2248 static void __exit atmci_exit(void)
2250 platform_driver_unregister(&atmci_driver);
2253 late_initcall(atmci_init); /* try to load after dma driver when built-in */
2254 module_exit(atmci_exit);
2256 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2257 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2258 MODULE_LICENSE("GPL v2");