2 * linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
4 * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
5 * Copyright (C) 2010 ST-Ericsson SA
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/device.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20 #include <linux/err.h>
21 #include <linux/highmem.h>
22 #include <linux/log2.h>
23 #include <linux/mmc/host.h>
24 #include <linux/mmc/card.h>
25 #include <linux/amba/bus.h>
26 #include <linux/clk.h>
27 #include <linux/scatterlist.h>
28 #include <linux/gpio.h>
29 #include <linux/of_gpio.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/dmaengine.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/amba/mmci.h>
34 #include <linux/pm_runtime.h>
35 #include <linux/types.h>
37 #include <asm/div64.h>
39 #include <asm/sizes.h>
43 #define DRIVER_NAME "mmci-pl18x"
45 static unsigned int fmax = 515633;
48 * struct variant_data - MMCI variant-specific quirks
49 * @clkreg: default value for MCICLOCK register
50 * @clkreg_enable: enable value for MMCICLOCK register
51 * @datalength_bits: number of bits in the MMCIDATALENGTH register
52 * @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY
53 * is asserted (likewise for RX)
54 * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY
55 * is asserted (likewise for RX)
56 * @sdio: variant supports SDIO
57 * @st_clkdiv: true if using a ST-specific clock divider algorithm
58 * @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register
59 * @pwrreg_powerup: power up value for MMCIPOWER register
60 * @signal_direction: input/out direction of bus signals can be indicated
64 unsigned int clkreg_enable;
65 unsigned int datalength_bits;
66 unsigned int fifosize;
67 unsigned int fifohalfsize;
70 bool blksz_datactrl16;
72 bool signal_direction;
75 static struct variant_data variant_arm = {
77 .fifohalfsize = 8 * 4,
78 .datalength_bits = 16,
79 .pwrreg_powerup = MCI_PWR_UP,
82 static struct variant_data variant_arm_extended_fifo = {
84 .fifohalfsize = 64 * 4,
85 .datalength_bits = 16,
86 .pwrreg_powerup = MCI_PWR_UP,
89 static struct variant_data variant_u300 = {
91 .fifohalfsize = 8 * 4,
92 .clkreg_enable = MCI_ST_U300_HWFCEN,
93 .datalength_bits = 16,
95 .pwrreg_powerup = MCI_PWR_ON,
96 .signal_direction = true,
99 static struct variant_data variant_nomadik = {
101 .fifohalfsize = 8 * 4,
102 .clkreg = MCI_CLK_ENABLE,
103 .datalength_bits = 24,
106 .pwrreg_powerup = MCI_PWR_ON,
107 .signal_direction = true,
110 static struct variant_data variant_ux500 = {
112 .fifohalfsize = 8 * 4,
113 .clkreg = MCI_CLK_ENABLE,
114 .clkreg_enable = MCI_ST_UX500_HWFCEN,
115 .datalength_bits = 24,
118 .pwrreg_powerup = MCI_PWR_ON,
119 .signal_direction = true,
122 static struct variant_data variant_ux500v2 = {
124 .fifohalfsize = 8 * 4,
125 .clkreg = MCI_CLK_ENABLE,
126 .clkreg_enable = MCI_ST_UX500_HWFCEN,
127 .datalength_bits = 24,
130 .blksz_datactrl16 = true,
131 .pwrreg_powerup = MCI_PWR_ON,
132 .signal_direction = true,
136 * This must be called with host->lock held
138 static void mmci_write_clkreg(struct mmci_host *host, u32 clk)
140 if (host->clk_reg != clk) {
142 writel(clk, host->base + MMCICLOCK);
147 * This must be called with host->lock held
149 static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
151 if (host->pwr_reg != pwr) {
153 writel(pwr, host->base + MMCIPOWER);
158 * This must be called with host->lock held
160 static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
162 struct variant_data *variant = host->variant;
163 u32 clk = variant->clkreg;
166 if (desired >= host->mclk) {
167 clk = MCI_CLK_BYPASS;
168 if (variant->st_clkdiv)
169 clk |= MCI_ST_UX500_NEG_EDGE;
170 host->cclk = host->mclk;
171 } else if (variant->st_clkdiv) {
173 * DB8500 TRM says f = mclk / (clkdiv + 2)
174 * => clkdiv = (mclk / f) - 2
175 * Round the divider up so we don't exceed the max
178 clk = DIV_ROUND_UP(host->mclk, desired) - 2;
181 host->cclk = host->mclk / (clk + 2);
184 * PL180 TRM says f = mclk / (2 * (clkdiv + 1))
185 * => clkdiv = mclk / (2 * f) - 1
187 clk = host->mclk / (2 * desired) - 1;
190 host->cclk = host->mclk / (2 * (clk + 1));
193 clk |= variant->clkreg_enable;
194 clk |= MCI_CLK_ENABLE;
195 /* This hasn't proven to be worthwhile */
196 /* clk |= MCI_CLK_PWRSAVE; */
199 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
201 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
202 clk |= MCI_ST_8BIT_BUS;
204 mmci_write_clkreg(host, clk);
208 mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
210 writel(0, host->base + MMCICOMMAND);
217 mmc_request_done(host->mmc, mrq);
219 pm_runtime_mark_last_busy(mmc_dev(host->mmc));
220 pm_runtime_put_autosuspend(mmc_dev(host->mmc));
223 static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
225 void __iomem *base = host->base;
227 if (host->singleirq) {
228 unsigned int mask0 = readl(base + MMCIMASK0);
230 mask0 &= ~MCI_IRQ1MASK;
233 writel(mask0, base + MMCIMASK0);
236 writel(mask, base + MMCIMASK1);
239 static void mmci_stop_data(struct mmci_host *host)
241 writel(0, host->base + MMCIDATACTRL);
242 mmci_set_mask1(host, 0);
246 static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
248 unsigned int flags = SG_MITER_ATOMIC;
250 if (data->flags & MMC_DATA_READ)
251 flags |= SG_MITER_TO_SG;
253 flags |= SG_MITER_FROM_SG;
255 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
259 * All the DMA operation mode stuff goes inside this ifdef.
260 * This assumes that you have a generic DMA device interface,
261 * no custom DMA interfaces are supported.
263 #ifdef CONFIG_DMA_ENGINE
264 static void __devinit mmci_dma_setup(struct mmci_host *host)
266 struct mmci_platform_data *plat = host->plat;
267 const char *rxname, *txname;
270 if (!plat || !plat->dma_filter) {
271 dev_info(mmc_dev(host->mmc), "no DMA platform data\n");
275 /* initialize pre request cookie */
276 host->next_data.cookie = 1;
278 /* Try to acquire a generic DMA engine slave channel */
280 dma_cap_set(DMA_SLAVE, mask);
283 * If only an RX channel is specified, the driver will
284 * attempt to use it bidirectionally, however if it is
285 * is specified but cannot be located, DMA will be disabled.
287 if (plat->dma_rx_param) {
288 host->dma_rx_channel = dma_request_channel(mask,
291 /* E.g if no DMA hardware is present */
292 if (!host->dma_rx_channel)
293 dev_err(mmc_dev(host->mmc), "no RX DMA channel\n");
296 if (plat->dma_tx_param) {
297 host->dma_tx_channel = dma_request_channel(mask,
300 if (!host->dma_tx_channel)
301 dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n");
303 host->dma_tx_channel = host->dma_rx_channel;
306 if (host->dma_rx_channel)
307 rxname = dma_chan_name(host->dma_rx_channel);
311 if (host->dma_tx_channel)
312 txname = dma_chan_name(host->dma_tx_channel);
316 dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
320 * Limit the maximum segment size in any SG entry according to
321 * the parameters of the DMA engine device.
323 if (host->dma_tx_channel) {
324 struct device *dev = host->dma_tx_channel->device->dev;
325 unsigned int max_seg_size = dma_get_max_seg_size(dev);
327 if (max_seg_size < host->mmc->max_seg_size)
328 host->mmc->max_seg_size = max_seg_size;
330 if (host->dma_rx_channel) {
331 struct device *dev = host->dma_rx_channel->device->dev;
332 unsigned int max_seg_size = dma_get_max_seg_size(dev);
334 if (max_seg_size < host->mmc->max_seg_size)
335 host->mmc->max_seg_size = max_seg_size;
340 * This is used in __devinit or __devexit so inline it
341 * so it can be discarded.
343 static inline void mmci_dma_release(struct mmci_host *host)
345 struct mmci_platform_data *plat = host->plat;
347 if (host->dma_rx_channel)
348 dma_release_channel(host->dma_rx_channel);
349 if (host->dma_tx_channel && plat->dma_tx_param)
350 dma_release_channel(host->dma_tx_channel);
351 host->dma_rx_channel = host->dma_tx_channel = NULL;
354 static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
356 struct dma_chan *chan = host->dma_current;
357 enum dma_data_direction dir;
361 /* Wait up to 1ms for the DMA to complete */
363 status = readl(host->base + MMCISTATUS);
364 if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
370 * Check to see whether we still have some data left in the FIFO -
371 * this catches DMA controllers which are unable to monitor the
372 * DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
373 * contiguous buffers. On TX, we'll get a FIFO underrun error.
375 if (status & MCI_RXDATAAVLBLMASK) {
376 dmaengine_terminate_all(chan);
381 if (data->flags & MMC_DATA_WRITE) {
384 dir = DMA_FROM_DEVICE;
387 if (!data->host_cookie)
388 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
391 * Use of DMA with scatter-gather is impossible.
392 * Give up with DMA and switch back to PIO mode.
394 if (status & MCI_RXDATAAVLBLMASK) {
395 dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
396 mmci_dma_release(host);
400 static void mmci_dma_data_error(struct mmci_host *host)
402 dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
403 dmaengine_terminate_all(host->dma_current);
406 static int mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
407 struct mmci_host_next *next)
409 struct variant_data *variant = host->variant;
410 struct dma_slave_config conf = {
411 .src_addr = host->phybase + MMCIFIFO,
412 .dst_addr = host->phybase + MMCIFIFO,
413 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
414 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
415 .src_maxburst = variant->fifohalfsize >> 2, /* # of words */
416 .dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
419 struct dma_chan *chan;
420 struct dma_device *device;
421 struct dma_async_tx_descriptor *desc;
422 enum dma_data_direction buffer_dirn;
425 /* Check if next job is already prepared */
426 if (data->host_cookie && !next &&
427 host->dma_current && host->dma_desc_current)
431 host->dma_current = NULL;
432 host->dma_desc_current = NULL;
435 if (data->flags & MMC_DATA_READ) {
436 conf.direction = DMA_DEV_TO_MEM;
437 buffer_dirn = DMA_FROM_DEVICE;
438 chan = host->dma_rx_channel;
440 conf.direction = DMA_MEM_TO_DEV;
441 buffer_dirn = DMA_TO_DEVICE;
442 chan = host->dma_tx_channel;
445 /* If there's no DMA channel, fall back to PIO */
449 /* If less than or equal to the fifo size, don't bother with DMA */
450 if (data->blksz * data->blocks <= variant->fifosize)
453 device = chan->device;
454 nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len, buffer_dirn);
458 dmaengine_slave_config(chan, &conf);
459 desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
460 conf.direction, DMA_CTRL_ACK);
465 next->dma_chan = chan;
466 next->dma_desc = desc;
468 host->dma_current = chan;
469 host->dma_desc_current = desc;
476 dmaengine_terminate_all(chan);
477 dma_unmap_sg(device->dev, data->sg, data->sg_len, buffer_dirn);
481 static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
484 struct mmc_data *data = host->data;
486 ret = mmci_dma_prep_data(host, host->data, NULL);
490 /* Okay, go for it. */
491 dev_vdbg(mmc_dev(host->mmc),
492 "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
493 data->sg_len, data->blksz, data->blocks, data->flags);
494 dmaengine_submit(host->dma_desc_current);
495 dma_async_issue_pending(host->dma_current);
497 datactrl |= MCI_DPSM_DMAENABLE;
499 /* Trigger the DMA transfer */
500 writel(datactrl, host->base + MMCIDATACTRL);
503 * Let the MMCI say when the data is ended and it's time
504 * to fire next DMA request. When that happens, MMCI will
505 * call mmci_data_end()
507 writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
508 host->base + MMCIMASK0);
512 static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
514 struct mmci_host_next *next = &host->next_data;
516 if (data->host_cookie && data->host_cookie != next->cookie) {
517 pr_warning("[%s] invalid cookie: data->host_cookie %d"
518 " host->next_data.cookie %d\n",
519 __func__, data->host_cookie, host->next_data.cookie);
520 data->host_cookie = 0;
523 if (!data->host_cookie)
526 host->dma_desc_current = next->dma_desc;
527 host->dma_current = next->dma_chan;
529 next->dma_desc = NULL;
530 next->dma_chan = NULL;
533 static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq,
536 struct mmci_host *host = mmc_priv(mmc);
537 struct mmc_data *data = mrq->data;
538 struct mmci_host_next *nd = &host->next_data;
543 if (data->host_cookie) {
544 data->host_cookie = 0;
548 /* if config for dma */
549 if (((data->flags & MMC_DATA_WRITE) && host->dma_tx_channel) ||
550 ((data->flags & MMC_DATA_READ) && host->dma_rx_channel)) {
551 if (mmci_dma_prep_data(host, data, nd))
552 data->host_cookie = 0;
554 data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie;
558 static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
561 struct mmci_host *host = mmc_priv(mmc);
562 struct mmc_data *data = mrq->data;
563 struct dma_chan *chan;
564 enum dma_data_direction dir;
569 if (data->flags & MMC_DATA_READ) {
570 dir = DMA_FROM_DEVICE;
571 chan = host->dma_rx_channel;
574 chan = host->dma_tx_channel;
578 /* if config for dma */
581 dmaengine_terminate_all(chan);
582 if (data->host_cookie)
583 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
585 mrq->data->host_cookie = 0;
590 /* Blank functions if the DMA engine is not available */
591 static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
594 static inline void mmci_dma_setup(struct mmci_host *host)
598 static inline void mmci_dma_release(struct mmci_host *host)
602 static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
606 static inline void mmci_dma_data_error(struct mmci_host *host)
610 static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
615 #define mmci_pre_request NULL
616 #define mmci_post_request NULL
620 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
622 struct variant_data *variant = host->variant;
623 unsigned int datactrl, timeout, irqmask;
624 unsigned long long clks;
628 dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n",
629 data->blksz, data->blocks, data->flags);
632 host->size = data->blksz * data->blocks;
633 data->bytes_xfered = 0;
635 clks = (unsigned long long)data->timeout_ns * host->cclk;
636 do_div(clks, 1000000000UL);
638 timeout = data->timeout_clks + (unsigned int)clks;
641 writel(timeout, base + MMCIDATATIMER);
642 writel(host->size, base + MMCIDATALENGTH);
644 blksz_bits = ffs(data->blksz) - 1;
645 BUG_ON(1 << blksz_bits != data->blksz);
647 if (variant->blksz_datactrl16)
648 datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
650 datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
652 if (data->flags & MMC_DATA_READ)
653 datactrl |= MCI_DPSM_DIRECTION;
655 /* The ST Micro variants has a special bit to enable SDIO */
656 if (variant->sdio && host->mmc->card)
657 if (mmc_card_sdio(host->mmc->card))
658 datactrl |= MCI_ST_DPSM_SDIOEN;
661 * Attempt to use DMA operation mode, if this
662 * should fail, fall back to PIO mode
664 if (!mmci_dma_start_data(host, datactrl))
667 /* IRQ mode, map the SG list for CPU reading/writing */
668 mmci_init_sg(host, data);
670 if (data->flags & MMC_DATA_READ) {
671 irqmask = MCI_RXFIFOHALFFULLMASK;
674 * If we have less than the fifo 'half-full' threshold to
675 * transfer, trigger a PIO interrupt as soon as any data
678 if (host->size < variant->fifohalfsize)
679 irqmask |= MCI_RXDATAAVLBLMASK;
682 * We don't actually need to include "FIFO empty" here
683 * since its implicit in "FIFO half empty".
685 irqmask = MCI_TXFIFOHALFEMPTYMASK;
688 writel(datactrl, base + MMCIDATACTRL);
689 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
690 mmci_set_mask1(host, irqmask);
694 mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
696 void __iomem *base = host->base;
698 dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
699 cmd->opcode, cmd->arg, cmd->flags);
701 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
702 writel(0, base + MMCICOMMAND);
706 c |= cmd->opcode | MCI_CPSM_ENABLE;
707 if (cmd->flags & MMC_RSP_PRESENT) {
708 if (cmd->flags & MMC_RSP_136)
709 c |= MCI_CPSM_LONGRSP;
710 c |= MCI_CPSM_RESPONSE;
713 c |= MCI_CPSM_INTERRUPT;
717 writel(cmd->arg, base + MMCIARGUMENT);
718 writel(c, base + MMCICOMMAND);
722 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
725 /* First check for errors */
726 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR|
727 MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
730 /* Terminate the DMA transfer */
731 if (dma_inprogress(host))
732 mmci_dma_data_error(host);
735 * Calculate how far we are into the transfer. Note that
736 * the data counter gives the number of bytes transferred
737 * on the MMC bus, not on the host side. On reads, this
738 * can be as much as a FIFO-worth of data ahead. This
739 * matters for FIFO overruns only.
741 remain = readl(host->base + MMCIDATACNT);
742 success = data->blksz * data->blocks - remain;
744 dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
746 if (status & MCI_DATACRCFAIL) {
747 /* Last block was not successful */
749 data->error = -EILSEQ;
750 } else if (status & MCI_DATATIMEOUT) {
751 data->error = -ETIMEDOUT;
752 } else if (status & MCI_STARTBITERR) {
753 data->error = -ECOMM;
754 } else if (status & MCI_TXUNDERRUN) {
756 } else if (status & MCI_RXOVERRUN) {
757 if (success > host->variant->fifosize)
758 success -= host->variant->fifosize;
763 data->bytes_xfered = round_down(success, data->blksz);
766 if (status & MCI_DATABLOCKEND)
767 dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
769 if (status & MCI_DATAEND || data->error) {
770 if (dma_inprogress(host))
771 mmci_dma_unmap(host, data);
772 mmci_stop_data(host);
775 /* The error clause is handled above, success! */
776 data->bytes_xfered = data->blksz * data->blocks;
779 mmci_request_end(host, data->mrq);
781 mmci_start_command(host, data->stop, 0);
787 mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
790 void __iomem *base = host->base;
794 if (status & MCI_CMDTIMEOUT) {
795 cmd->error = -ETIMEDOUT;
796 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
797 cmd->error = -EILSEQ;
799 cmd->resp[0] = readl(base + MMCIRESPONSE0);
800 cmd->resp[1] = readl(base + MMCIRESPONSE1);
801 cmd->resp[2] = readl(base + MMCIRESPONSE2);
802 cmd->resp[3] = readl(base + MMCIRESPONSE3);
805 if (!cmd->data || cmd->error) {
807 /* Terminate the DMA transfer */
808 if (dma_inprogress(host))
809 mmci_dma_data_error(host);
810 mmci_stop_data(host);
812 mmci_request_end(host, cmd->mrq);
813 } else if (!(cmd->data->flags & MMC_DATA_READ)) {
814 mmci_start_data(host, cmd->data);
818 static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
820 void __iomem *base = host->base;
823 int host_remain = host->size;
826 int count = host_remain - (readl(base + MMCIFIFOCNT) << 2);
835 * SDIO especially may want to send something that is
836 * not divisible by 4 (as opposed to card sectors
837 * etc). Therefore make sure to always read the last bytes
838 * while only doing full 32-bit reads towards the FIFO.
840 if (unlikely(count & 0x3)) {
842 unsigned char buf[4];
843 readsl(base + MMCIFIFO, buf, 1);
844 memcpy(ptr, buf, count);
846 readsl(base + MMCIFIFO, ptr, count >> 2);
850 readsl(base + MMCIFIFO, ptr, count >> 2);
855 host_remain -= count;
860 status = readl(base + MMCISTATUS);
861 } while (status & MCI_RXDATAAVLBL);
866 static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
868 struct variant_data *variant = host->variant;
869 void __iomem *base = host->base;
873 unsigned int count, maxcnt;
875 maxcnt = status & MCI_TXFIFOEMPTY ?
876 variant->fifosize : variant->fifohalfsize;
877 count = min(remain, maxcnt);
880 * The ST Micro variant for SDIO transfer sizes
881 * less then 8 bytes should have clock H/W flow
885 mmc_card_sdio(host->mmc->card)) {
888 clk = host->clk_reg & ~variant->clkreg_enable;
890 clk = host->clk_reg | variant->clkreg_enable;
892 mmci_write_clkreg(host, clk);
896 * SDIO especially may want to send something that is
897 * not divisible by 4 (as opposed to card sectors
898 * etc), and the FIFO only accept full 32-bit writes.
899 * So compensate by adding +3 on the count, a single
900 * byte become a 32bit write, 7 bytes will be two
903 writesl(base + MMCIFIFO, ptr, (count + 3) >> 2);
911 status = readl(base + MMCISTATUS);
912 } while (status & MCI_TXFIFOHALFEMPTY);
918 * PIO data transfer IRQ handler.
920 static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
922 struct mmci_host *host = dev_id;
923 struct sg_mapping_iter *sg_miter = &host->sg_miter;
924 struct variant_data *variant = host->variant;
925 void __iomem *base = host->base;
929 status = readl(base + MMCISTATUS);
931 dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
933 local_irq_save(flags);
936 unsigned int remain, len;
940 * For write, we only need to test the half-empty flag
941 * here - if the FIFO is completely empty, then by
942 * definition it is more than half empty.
944 * For read, check for data available.
946 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
949 if (!sg_miter_next(sg_miter))
952 buffer = sg_miter->addr;
953 remain = sg_miter->length;
956 if (status & MCI_RXACTIVE)
957 len = mmci_pio_read(host, buffer, remain);
958 if (status & MCI_TXACTIVE)
959 len = mmci_pio_write(host, buffer, remain, status);
961 sg_miter->consumed = len;
969 status = readl(base + MMCISTATUS);
972 sg_miter_stop(sg_miter);
974 local_irq_restore(flags);
977 * If we have less than the fifo 'half-full' threshold to transfer,
978 * trigger a PIO interrupt as soon as any data is available.
980 if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
981 mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
984 * If we run out of data, disable the data IRQs; this
985 * prevents a race where the FIFO becomes empty before
986 * the chip itself has disabled the data path, and
987 * stops us racing with our data end IRQ.
989 if (host->size == 0) {
990 mmci_set_mask1(host, 0);
991 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
998 * Handle completion of command and data transfers.
1000 static irqreturn_t mmci_irq(int irq, void *dev_id)
1002 struct mmci_host *host = dev_id;
1006 spin_lock(&host->lock);
1009 struct mmc_command *cmd;
1010 struct mmc_data *data;
1012 status = readl(host->base + MMCISTATUS);
1014 if (host->singleirq) {
1015 if (status & readl(host->base + MMCIMASK1))
1016 mmci_pio_irq(irq, dev_id);
1018 status &= ~MCI_IRQ1MASK;
1021 status &= readl(host->base + MMCIMASK0);
1022 writel(status, host->base + MMCICLEAR);
1024 dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status);
1027 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR|
1028 MCI_TXUNDERRUN|MCI_RXOVERRUN|MCI_DATAEND|
1029 MCI_DATABLOCKEND) && data)
1030 mmci_data_irq(host, data, status);
1033 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
1034 mmci_cmd_irq(host, cmd, status);
1039 spin_unlock(&host->lock);
1041 return IRQ_RETVAL(ret);
1044 static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1046 struct mmci_host *host = mmc_priv(mmc);
1047 unsigned long flags;
1049 WARN_ON(host->mrq != NULL);
1051 if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
1052 dev_err(mmc_dev(mmc), "unsupported block size (%d bytes)\n",
1054 mrq->cmd->error = -EINVAL;
1055 mmc_request_done(mmc, mrq);
1059 pm_runtime_get_sync(mmc_dev(mmc));
1061 spin_lock_irqsave(&host->lock, flags);
1066 mmci_get_next_data(host, mrq->data);
1068 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
1069 mmci_start_data(host, mrq->data);
1071 mmci_start_command(host, mrq->cmd, 0);
1073 spin_unlock_irqrestore(&host->lock, flags);
1076 static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1078 struct mmci_host *host = mmc_priv(mmc);
1079 struct variant_data *variant = host->variant;
1081 unsigned long flags;
1084 pm_runtime_get_sync(mmc_dev(mmc));
1086 if (host->plat->ios_handler &&
1087 host->plat->ios_handler(mmc_dev(mmc), ios))
1088 dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
1090 switch (ios->power_mode) {
1093 ret = mmc_regulator_set_ocr(mmc, host->vcc, 0);
1097 ret = mmc_regulator_set_ocr(mmc, host->vcc, ios->vdd);
1099 dev_err(mmc_dev(mmc), "unable to set OCR\n");
1101 * The .set_ios() function in the mmc_host_ops
1102 * struct return void, and failing to set the
1103 * power should be rare so we print an error
1110 * The ST Micro variant doesn't have the PL180s MCI_PWR_UP
1111 * and instead uses MCI_PWR_ON so apply whatever value is
1112 * configured in the variant data.
1114 pwr |= variant->pwrreg_powerup;
1122 if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) {
1124 * The ST Micro variant has some additional bits
1125 * indicating signal direction for the signals in
1126 * the SD/MMC bus and feedback-clock usage.
1128 pwr |= host->plat->sigdir;
1130 if (ios->bus_width == MMC_BUS_WIDTH_4)
1131 pwr &= ~MCI_ST_DATA74DIREN;
1132 else if (ios->bus_width == MMC_BUS_WIDTH_1)
1133 pwr &= (~MCI_ST_DATA74DIREN &
1134 ~MCI_ST_DATA31DIREN &
1135 ~MCI_ST_DATA2DIREN);
1138 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
1139 if (host->hw_designer != AMBA_VENDOR_ST)
1143 * The ST Micro variant use the ROD bit for something
1144 * else and only has OD (Open Drain).
1150 spin_lock_irqsave(&host->lock, flags);
1152 mmci_set_clkreg(host, ios->clock);
1153 mmci_write_pwrreg(host, pwr);
1155 spin_unlock_irqrestore(&host->lock, flags);
1158 pm_runtime_mark_last_busy(mmc_dev(mmc));
1159 pm_runtime_put_autosuspend(mmc_dev(mmc));
1162 static int mmci_get_ro(struct mmc_host *mmc)
1164 struct mmci_host *host = mmc_priv(mmc);
1166 if (host->gpio_wp == -ENOSYS)
1169 return gpio_get_value_cansleep(host->gpio_wp);
1172 static int mmci_get_cd(struct mmc_host *mmc)
1174 struct mmci_host *host = mmc_priv(mmc);
1175 struct mmci_platform_data *plat = host->plat;
1176 unsigned int status;
1178 if (host->gpio_cd == -ENOSYS) {
1180 return 1; /* Assume always present */
1182 status = plat->status(mmc_dev(host->mmc));
1184 status = !!gpio_get_value_cansleep(host->gpio_cd)
1188 * Use positive logic throughout - status is zero for no card,
1189 * non-zero for card inserted.
1194 static irqreturn_t mmci_cd_irq(int irq, void *dev_id)
1196 struct mmci_host *host = dev_id;
1198 mmc_detect_change(host->mmc, msecs_to_jiffies(500));
1203 static const struct mmc_host_ops mmci_ops = {
1204 .request = mmci_request,
1205 .pre_req = mmci_pre_request,
1206 .post_req = mmci_post_request,
1207 .set_ios = mmci_set_ios,
1208 .get_ro = mmci_get_ro,
1209 .get_cd = mmci_get_cd,
1213 static void mmci_dt_populate_generic_pdata(struct device_node *np,
1214 struct mmci_platform_data *pdata)
1218 pdata->gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
1219 pdata->gpio_cd = of_get_named_gpio(np, "cd-gpios", 0);
1221 if (of_get_property(np, "cd-inverted", NULL))
1222 pdata->cd_invert = true;
1224 pdata->cd_invert = false;
1226 of_property_read_u32(np, "max-frequency", &pdata->f_max);
1228 pr_warn("%s has no 'max-frequency' property\n", np->full_name);
1230 if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
1231 pdata->capabilities |= MMC_CAP_MMC_HIGHSPEED;
1232 if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
1233 pdata->capabilities |= MMC_CAP_SD_HIGHSPEED;
1235 of_property_read_u32(np, "bus-width", &bus_width);
1236 switch (bus_width) {
1238 /* No bus-width supplied. */
1241 pdata->capabilities |= MMC_CAP_4_BIT_DATA;
1244 pdata->capabilities |= MMC_CAP_8_BIT_DATA;
1247 pr_warn("%s: Unsupported bus width\n", np->full_name);
1251 static void mmci_dt_populate_generic_pdata(struct device_node *np,
1252 struct mmci_platform_data *pdata)
1258 static int __devinit mmci_probe(struct amba_device *dev,
1259 const struct amba_id *id)
1261 struct mmci_platform_data *plat = dev->dev.platform_data;
1262 struct device_node *np = dev->dev.of_node;
1263 struct variant_data *variant = id->data;
1264 struct mmci_host *host;
1265 struct mmc_host *mmc;
1268 /* Must have platform data or Device Tree. */
1270 dev_err(&dev->dev, "No plat data or DT found\n");
1275 plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL);
1281 mmci_dt_populate_generic_pdata(np, plat);
1283 ret = amba_request_regions(dev, DRIVER_NAME);
1287 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
1293 host = mmc_priv(mmc);
1296 host->gpio_wp = -ENOSYS;
1297 host->gpio_cd = -ENOSYS;
1298 host->gpio_cd_irq = -1;
1300 host->hw_designer = amba_manf(dev);
1301 host->hw_revision = amba_rev(dev);
1302 dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer);
1303 dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision);
1305 host->clk = clk_get(&dev->dev, NULL);
1306 if (IS_ERR(host->clk)) {
1307 ret = PTR_ERR(host->clk);
1312 ret = clk_prepare(host->clk);
1316 ret = clk_enable(host->clk);
1321 host->variant = variant;
1322 host->mclk = clk_get_rate(host->clk);
1324 * According to the spec, mclk is max 100 MHz,
1325 * so we try to adjust the clock down to this,
1328 if (host->mclk > 100000000) {
1329 ret = clk_set_rate(host->clk, 100000000);
1332 host->mclk = clk_get_rate(host->clk);
1333 dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
1336 host->phybase = dev->res.start;
1337 host->base = ioremap(dev->res.start, resource_size(&dev->res));
1343 mmc->ops = &mmci_ops;
1345 * The ARM and ST versions of the block have slightly different
1346 * clock divider equations which means that the minimum divider
1349 if (variant->st_clkdiv)
1350 mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
1352 mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
1354 * If the platform data supplies a maximum operating
1355 * frequency, this takes precedence. Else, we fall back
1356 * to using the module parameter, which has a (low)
1357 * default value in case it is not specified. Either
1358 * value must not exceed the clock rate into the block,
1362 mmc->f_max = min(host->mclk, plat->f_max);
1364 mmc->f_max = min(host->mclk, fmax);
1365 dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
1367 #ifdef CONFIG_REGULATOR
1368 /* If we're using the regulator framework, try to fetch a regulator */
1369 host->vcc = regulator_get(&dev->dev, "vmmc");
1370 if (IS_ERR(host->vcc))
1373 int mask = mmc_regulator_get_ocrmask(host->vcc);
1376 dev_err(&dev->dev, "error getting OCR mask (%d)\n",
1379 host->mmc->ocr_avail = (u32) mask;
1382 "Provided ocr_mask/setpower will not be used "
1383 "(using regulator instead)\n");
1387 /* Fall back to platform data if no regulator is found */
1388 if (host->vcc == NULL)
1389 mmc->ocr_avail = plat->ocr_mask;
1390 mmc->caps = plat->capabilities;
1391 mmc->caps2 = plat->capabilities2;
1396 mmc->max_segs = NR_SG;
1399 * Since only a certain number of bits are valid in the data length
1400 * register, we must ensure that we don't exceed 2^num-1 bytes in a
1403 mmc->max_req_size = (1 << variant->datalength_bits) - 1;
1406 * Set the maximum segment size. Since we aren't doing DMA
1407 * (yet) we are only limited by the data length register.
1409 mmc->max_seg_size = mmc->max_req_size;
1412 * Block size can be up to 2048 bytes, but must be a power of two.
1414 mmc->max_blk_size = 1 << 11;
1417 * Limit the number of blocks transferred so that we don't overflow
1418 * the maximum request size.
1420 mmc->max_blk_count = mmc->max_req_size >> 11;
1422 spin_lock_init(&host->lock);
1424 writel(0, host->base + MMCIMASK0);
1425 writel(0, host->base + MMCIMASK1);
1426 writel(0xfff, host->base + MMCICLEAR);
1428 if (plat->gpio_cd == -EPROBE_DEFER) {
1429 ret = -EPROBE_DEFER;
1432 if (gpio_is_valid(plat->gpio_cd)) {
1433 ret = gpio_request(plat->gpio_cd, DRIVER_NAME " (cd)");
1435 ret = gpio_direction_input(plat->gpio_cd);
1437 host->gpio_cd = plat->gpio_cd;
1438 else if (ret != -ENOSYS)
1442 * A gpio pin that will detect cards when inserted and removed
1443 * will most likely want to trigger on the edges if it is
1444 * 0 when ejected and 1 when inserted (or mutatis mutandis
1445 * for the inverted case) so we request triggers on both
1448 ret = request_any_context_irq(gpio_to_irq(plat->gpio_cd),
1450 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
1451 DRIVER_NAME " (cd)", host);
1453 host->gpio_cd_irq = gpio_to_irq(plat->gpio_cd);
1455 if (plat->gpio_wp == -EPROBE_DEFER) {
1456 ret = -EPROBE_DEFER;
1459 if (gpio_is_valid(plat->gpio_wp)) {
1460 ret = gpio_request(plat->gpio_wp, DRIVER_NAME " (wp)");
1462 ret = gpio_direction_input(plat->gpio_wp);
1464 host->gpio_wp = plat->gpio_wp;
1465 else if (ret != -ENOSYS)
1469 if ((host->plat->status || host->gpio_cd != -ENOSYS)
1470 && host->gpio_cd_irq < 0)
1471 mmc->caps |= MMC_CAP_NEEDS_POLL;
1473 ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
1478 host->singleirq = true;
1480 ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED,
1481 DRIVER_NAME " (pio)", host);
1486 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
1488 amba_set_drvdata(dev, mmc);
1490 dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
1491 mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
1492 amba_rev(dev), (unsigned long long)dev->res.start,
1493 dev->irq[0], dev->irq[1]);
1495 mmci_dma_setup(host);
1497 pm_runtime_set_autosuspend_delay(&dev->dev, 50);
1498 pm_runtime_use_autosuspend(&dev->dev);
1499 pm_runtime_put(&dev->dev);
1506 free_irq(dev->irq[0], host);
1508 if (host->gpio_wp != -ENOSYS)
1509 gpio_free(host->gpio_wp);
1511 if (host->gpio_cd_irq >= 0)
1512 free_irq(host->gpio_cd_irq, host);
1513 if (host->gpio_cd != -ENOSYS)
1514 gpio_free(host->gpio_cd);
1516 iounmap(host->base);
1518 clk_disable(host->clk);
1520 clk_unprepare(host->clk);
1526 amba_release_regions(dev);
1531 static int __devexit mmci_remove(struct amba_device *dev)
1533 struct mmc_host *mmc = amba_get_drvdata(dev);
1535 amba_set_drvdata(dev, NULL);
1538 struct mmci_host *host = mmc_priv(mmc);
1541 * Undo pm_runtime_put() in probe. We use the _sync
1542 * version here so that we can access the primecell.
1544 pm_runtime_get_sync(&dev->dev);
1546 mmc_remove_host(mmc);
1548 writel(0, host->base + MMCIMASK0);
1549 writel(0, host->base + MMCIMASK1);
1551 writel(0, host->base + MMCICOMMAND);
1552 writel(0, host->base + MMCIDATACTRL);
1554 mmci_dma_release(host);
1555 free_irq(dev->irq[0], host);
1556 if (!host->singleirq)
1557 free_irq(dev->irq[1], host);
1559 if (host->gpio_wp != -ENOSYS)
1560 gpio_free(host->gpio_wp);
1561 if (host->gpio_cd_irq >= 0)
1562 free_irq(host->gpio_cd_irq, host);
1563 if (host->gpio_cd != -ENOSYS)
1564 gpio_free(host->gpio_cd);
1566 iounmap(host->base);
1567 clk_disable(host->clk);
1568 clk_unprepare(host->clk);
1572 mmc_regulator_set_ocr(mmc, host->vcc, 0);
1573 regulator_put(host->vcc);
1577 amba_release_regions(dev);
1583 #ifdef CONFIG_SUSPEND
1584 static int mmci_suspend(struct device *dev)
1586 struct amba_device *adev = to_amba_device(dev);
1587 struct mmc_host *mmc = amba_get_drvdata(adev);
1591 struct mmci_host *host = mmc_priv(mmc);
1593 ret = mmc_suspend_host(mmc);
1595 pm_runtime_get_sync(dev);
1596 writel(0, host->base + MMCIMASK0);
1603 static int mmci_resume(struct device *dev)
1605 struct amba_device *adev = to_amba_device(dev);
1606 struct mmc_host *mmc = amba_get_drvdata(adev);
1610 struct mmci_host *host = mmc_priv(mmc);
1612 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
1613 pm_runtime_put(dev);
1615 ret = mmc_resume_host(mmc);
1622 static const struct dev_pm_ops mmci_dev_pm_ops = {
1623 SET_SYSTEM_SLEEP_PM_OPS(mmci_suspend, mmci_resume)
1626 static struct amba_id mmci_ids[] = {
1630 .data = &variant_arm,
1635 .data = &variant_arm_extended_fifo,
1640 .data = &variant_arm,
1642 /* ST Micro variants */
1646 .data = &variant_u300,
1651 .data = &variant_nomadik,
1656 .data = &variant_u300,
1661 .data = &variant_ux500,
1666 .data = &variant_ux500v2,
1671 MODULE_DEVICE_TABLE(amba, mmci_ids);
1673 static struct amba_driver mmci_driver = {
1675 .name = DRIVER_NAME,
1676 .pm = &mmci_dev_pm_ops,
1678 .probe = mmci_probe,
1679 .remove = __devexit_p(mmci_remove),
1680 .id_table = mmci_ids,
1683 module_amba_driver(mmci_driver);
1685 module_param(fmax, uint, 0444);
1687 MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
1688 MODULE_LICENSE("GPL");