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>
17 #include <linux/interrupt.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/delay.h>
21 #include <linux/err.h>
22 #include <linux/highmem.h>
23 #include <linux/log2.h>
24 #include <linux/mmc/pm.h>
25 #include <linux/mmc/host.h>
26 #include <linux/mmc/card.h>
27 #include <linux/mmc/slot-gpio.h>
28 #include <linux/amba/bus.h>
29 #include <linux/clk.h>
30 #include <linux/scatterlist.h>
31 #include <linux/gpio.h>
32 #include <linux/of_gpio.h>
33 #include <linux/regulator/consumer.h>
34 #include <linux/dmaengine.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/amba/mmci.h>
37 #include <linux/pm_runtime.h>
38 #include <linux/types.h>
39 #include <linux/pinctrl/consumer.h>
41 #include <asm/div64.h>
45 #include "mmci_qcom_dml.h"
47 #define DRIVER_NAME "mmci-pl18x"
49 static unsigned int fmax = 515633;
52 * struct variant_data - MMCI variant-specific quirks
53 * @clkreg: default value for MCICLOCK register
54 * @clkreg_enable: enable value for MMCICLOCK register
55 * @clkreg_8bit_bus_enable: enable value for 8 bit bus
56 * @clkreg_neg_edge_enable: enable value for inverted data/cmd output
57 * @datalength_bits: number of bits in the MMCIDATALENGTH register
58 * @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY
59 * is asserted (likewise for RX)
60 * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY
61 * is asserted (likewise for RX)
62 * @data_cmd_enable: enable value for data commands.
63 * @st_sdio: enable ST specific SDIO logic
64 * @st_clkdiv: true if using a ST-specific clock divider algorithm
65 * @datactrl_mask_ddrmode: ddr mode mask in datactrl register.
66 * @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register
67 * @blksz_datactrl4: true if Block size is at b4..b16 position in datactrl
69 * @datactrl_mask_sdio: SDIO enable mask in datactrl register
70 * @pwrreg_powerup: power up value for MMCIPOWER register
71 * @f_max: maximum clk frequency supported by the controller.
72 * @signal_direction: input/out direction of bus signals can be indicated
73 * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock
74 * @busy_detect: true if the variant supports busy detection on DAT0.
75 * @busy_dpsm_flag: bitmask enabling busy detection in the DPSM
76 * @busy_detect_flag: bitmask identifying the bit in the MMCISTATUS register
77 * indicating that the card is busy
78 * @busy_detect_mask: bitmask identifying the bit in the MMCIMASK0 to mask for
79 * getting busy end detection interrupts
80 * @pwrreg_nopower: bits in MMCIPOWER don't controls ext. power supply
81 * @explicit_mclk_control: enable explicit mclk control in driver.
82 * @qcom_fifo: enables qcom specific fifo pio read logic.
83 * @qcom_dml: enables qcom specific dma glue for dma transfers.
84 * @reversed_irq_handling: handle data irq before cmd irq.
85 * @mmcimask1: true if variant have a MMCIMASK1 register.
86 * @start_err: bitmask identifying the STARTBITERR bit inside MMCISTATUS
91 unsigned int clkreg_enable;
92 unsigned int clkreg_8bit_bus_enable;
93 unsigned int clkreg_neg_edge_enable;
94 unsigned int datalength_bits;
95 unsigned int fifosize;
96 unsigned int fifohalfsize;
97 unsigned int data_cmd_enable;
98 unsigned int datactrl_mask_ddrmode;
99 unsigned int datactrl_mask_sdio;
102 bool blksz_datactrl16;
103 bool blksz_datactrl4;
106 bool signal_direction;
110 u32 busy_detect_flag;
111 u32 busy_detect_mask;
113 bool explicit_mclk_control;
116 bool reversed_irq_handling;
121 static struct variant_data variant_arm = {
123 .fifohalfsize = 8 * 4,
124 .datalength_bits = 16,
125 .pwrreg_powerup = MCI_PWR_UP,
127 .reversed_irq_handling = true,
129 .start_err = MCI_STARTBITERR,
132 static struct variant_data variant_arm_extended_fifo = {
134 .fifohalfsize = 64 * 4,
135 .datalength_bits = 16,
136 .pwrreg_powerup = MCI_PWR_UP,
139 .start_err = MCI_STARTBITERR,
142 static struct variant_data variant_arm_extended_fifo_hwfc = {
144 .fifohalfsize = 64 * 4,
145 .clkreg_enable = MCI_ARM_HWFCEN,
146 .datalength_bits = 16,
147 .pwrreg_powerup = MCI_PWR_UP,
150 .start_err = MCI_STARTBITERR,
153 static struct variant_data variant_u300 = {
155 .fifohalfsize = 8 * 4,
156 .clkreg_enable = MCI_ST_U300_HWFCEN,
157 .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
158 .datalength_bits = 16,
159 .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
161 .pwrreg_powerup = MCI_PWR_ON,
163 .signal_direction = true,
164 .pwrreg_clkgate = true,
165 .pwrreg_nopower = true,
167 .start_err = MCI_STARTBITERR,
170 static struct variant_data variant_nomadik = {
172 .fifohalfsize = 8 * 4,
173 .clkreg = MCI_CLK_ENABLE,
174 .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
175 .datalength_bits = 24,
176 .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
179 .pwrreg_powerup = MCI_PWR_ON,
181 .signal_direction = true,
182 .pwrreg_clkgate = true,
183 .pwrreg_nopower = true,
185 .start_err = MCI_STARTBITERR,
188 static struct variant_data variant_ux500 = {
190 .fifohalfsize = 8 * 4,
191 .clkreg = MCI_CLK_ENABLE,
192 .clkreg_enable = MCI_ST_UX500_HWFCEN,
193 .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
194 .clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
195 .datalength_bits = 24,
196 .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
199 .pwrreg_powerup = MCI_PWR_ON,
201 .signal_direction = true,
202 .pwrreg_clkgate = true,
204 .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE,
205 .busy_detect_flag = MCI_ST_CARDBUSY,
206 .busy_detect_mask = MCI_ST_BUSYENDMASK,
207 .pwrreg_nopower = true,
209 .start_err = MCI_STARTBITERR,
212 static struct variant_data variant_ux500v2 = {
214 .fifohalfsize = 8 * 4,
215 .clkreg = MCI_CLK_ENABLE,
216 .clkreg_enable = MCI_ST_UX500_HWFCEN,
217 .clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
218 .clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
219 .datactrl_mask_ddrmode = MCI_DPSM_ST_DDRMODE,
220 .datalength_bits = 24,
221 .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
224 .blksz_datactrl16 = true,
225 .pwrreg_powerup = MCI_PWR_ON,
227 .signal_direction = true,
228 .pwrreg_clkgate = true,
230 .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE,
231 .busy_detect_flag = MCI_ST_CARDBUSY,
232 .busy_detect_mask = MCI_ST_BUSYENDMASK,
233 .pwrreg_nopower = true,
235 .start_err = MCI_STARTBITERR,
238 static struct variant_data variant_qcom = {
240 .fifohalfsize = 8 * 4,
241 .clkreg = MCI_CLK_ENABLE,
242 .clkreg_enable = MCI_QCOM_CLK_FLOWENA |
243 MCI_QCOM_CLK_SELECT_IN_FBCLK,
244 .clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8,
245 .datactrl_mask_ddrmode = MCI_QCOM_CLK_SELECT_IN_DDR_MODE,
246 .data_cmd_enable = MCI_CPSM_QCOM_DATCMD,
247 .blksz_datactrl4 = true,
248 .datalength_bits = 24,
249 .pwrreg_powerup = MCI_PWR_UP,
251 .explicit_mclk_control = true,
255 .start_err = MCI_STARTBITERR,
258 /* Busy detection for the ST Micro variant */
259 static int mmci_card_busy(struct mmc_host *mmc)
261 struct mmci_host *host = mmc_priv(mmc);
265 spin_lock_irqsave(&host->lock, flags);
266 if (readl(host->base + MMCISTATUS) & host->variant->busy_detect_flag)
268 spin_unlock_irqrestore(&host->lock, flags);
274 * Validate mmc prerequisites
276 static int mmci_validate_data(struct mmci_host *host,
277 struct mmc_data *data)
282 if (!is_power_of_2(data->blksz)) {
283 dev_err(mmc_dev(host->mmc),
284 "unsupported block size (%d bytes)\n", data->blksz);
291 static void mmci_reg_delay(struct mmci_host *host)
294 * According to the spec, at least three feedback clock cycles
295 * of max 52 MHz must pass between two writes to the MMCICLOCK reg.
296 * Three MCLK clock cycles must pass between two MMCIPOWER reg writes.
297 * Worst delay time during card init is at 100 kHz => 30 us.
298 * Worst delay time when up and running is at 25 MHz => 120 ns.
300 if (host->cclk < 25000000)
307 * This must be called with host->lock held
309 static void mmci_write_clkreg(struct mmci_host *host, u32 clk)
311 if (host->clk_reg != clk) {
313 writel(clk, host->base + MMCICLOCK);
318 * This must be called with host->lock held
320 static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
322 if (host->pwr_reg != pwr) {
324 writel(pwr, host->base + MMCIPOWER);
329 * This must be called with host->lock held
331 static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
333 /* Keep busy mode in DPSM if enabled */
334 datactrl |= host->datactrl_reg & host->variant->busy_dpsm_flag;
336 if (host->datactrl_reg != datactrl) {
337 host->datactrl_reg = datactrl;
338 writel(datactrl, host->base + MMCIDATACTRL);
343 * This must be called with host->lock held
345 static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
347 struct variant_data *variant = host->variant;
348 u32 clk = variant->clkreg;
350 /* Make sure cclk reflects the current calculated clock */
354 if (variant->explicit_mclk_control) {
355 host->cclk = host->mclk;
356 } else if (desired >= host->mclk) {
357 clk = MCI_CLK_BYPASS;
358 if (variant->st_clkdiv)
359 clk |= MCI_ST_UX500_NEG_EDGE;
360 host->cclk = host->mclk;
361 } else if (variant->st_clkdiv) {
363 * DB8500 TRM says f = mclk / (clkdiv + 2)
364 * => clkdiv = (mclk / f) - 2
365 * Round the divider up so we don't exceed the max
368 clk = DIV_ROUND_UP(host->mclk, desired) - 2;
371 host->cclk = host->mclk / (clk + 2);
374 * PL180 TRM says f = mclk / (2 * (clkdiv + 1))
375 * => clkdiv = mclk / (2 * f) - 1
377 clk = host->mclk / (2 * desired) - 1;
380 host->cclk = host->mclk / (2 * (clk + 1));
383 clk |= variant->clkreg_enable;
384 clk |= MCI_CLK_ENABLE;
385 /* This hasn't proven to be worthwhile */
386 /* clk |= MCI_CLK_PWRSAVE; */
389 /* Set actual clock for debug */
390 host->mmc->actual_clock = host->cclk;
392 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
394 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
395 clk |= variant->clkreg_8bit_bus_enable;
397 if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
398 host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
399 clk |= variant->clkreg_neg_edge_enable;
401 mmci_write_clkreg(host, clk);
405 mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
407 writel(0, host->base + MMCICOMMAND);
414 mmc_request_done(host->mmc, mrq);
417 static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
419 void __iomem *base = host->base;
420 struct variant_data *variant = host->variant;
422 if (host->singleirq) {
423 unsigned int mask0 = readl(base + MMCIMASK0);
425 mask0 &= ~MCI_IRQ1MASK;
428 writel(mask0, base + MMCIMASK0);
431 if (variant->mmcimask1)
432 writel(mask, base + MMCIMASK1);
434 host->mask1_reg = mask;
437 static void mmci_stop_data(struct mmci_host *host)
439 mmci_write_datactrlreg(host, 0);
440 mmci_set_mask1(host, 0);
444 static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
446 unsigned int flags = SG_MITER_ATOMIC;
448 if (data->flags & MMC_DATA_READ)
449 flags |= SG_MITER_TO_SG;
451 flags |= SG_MITER_FROM_SG;
453 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
457 * All the DMA operation mode stuff goes inside this ifdef.
458 * This assumes that you have a generic DMA device interface,
459 * no custom DMA interfaces are supported.
461 #ifdef CONFIG_DMA_ENGINE
462 static void mmci_dma_setup(struct mmci_host *host)
464 const char *rxname, *txname;
465 struct variant_data *variant = host->variant;
467 host->dma_rx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "rx");
468 host->dma_tx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "tx");
470 /* initialize pre request cookie */
471 host->next_data.cookie = 1;
474 * If only an RX channel is specified, the driver will
475 * attempt to use it bidirectionally, however if it is
476 * is specified but cannot be located, DMA will be disabled.
478 if (host->dma_rx_channel && !host->dma_tx_channel)
479 host->dma_tx_channel = host->dma_rx_channel;
481 if (host->dma_rx_channel)
482 rxname = dma_chan_name(host->dma_rx_channel);
486 if (host->dma_tx_channel)
487 txname = dma_chan_name(host->dma_tx_channel);
491 dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
495 * Limit the maximum segment size in any SG entry according to
496 * the parameters of the DMA engine device.
498 if (host->dma_tx_channel) {
499 struct device *dev = host->dma_tx_channel->device->dev;
500 unsigned int max_seg_size = dma_get_max_seg_size(dev);
502 if (max_seg_size < host->mmc->max_seg_size)
503 host->mmc->max_seg_size = max_seg_size;
505 if (host->dma_rx_channel) {
506 struct device *dev = host->dma_rx_channel->device->dev;
507 unsigned int max_seg_size = dma_get_max_seg_size(dev);
509 if (max_seg_size < host->mmc->max_seg_size)
510 host->mmc->max_seg_size = max_seg_size;
513 if (variant->qcom_dml && host->dma_rx_channel && host->dma_tx_channel)
514 if (dml_hw_init(host, host->mmc->parent->of_node))
515 variant->qcom_dml = false;
519 * This is used in or so inline it
520 * so it can be discarded.
522 static inline void mmci_dma_release(struct mmci_host *host)
524 if (host->dma_rx_channel)
525 dma_release_channel(host->dma_rx_channel);
526 if (host->dma_tx_channel)
527 dma_release_channel(host->dma_tx_channel);
528 host->dma_rx_channel = host->dma_tx_channel = NULL;
531 static void mmci_dma_data_error(struct mmci_host *host)
533 dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
534 dmaengine_terminate_all(host->dma_current);
535 host->dma_in_progress = false;
536 host->dma_current = NULL;
537 host->dma_desc_current = NULL;
538 host->data->host_cookie = 0;
541 static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
543 struct dma_chan *chan;
545 if (data->flags & MMC_DATA_READ)
546 chan = host->dma_rx_channel;
548 chan = host->dma_tx_channel;
550 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len,
551 mmc_get_dma_dir(data));
554 static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
559 /* Wait up to 1ms for the DMA to complete */
561 status = readl(host->base + MMCISTATUS);
562 if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
568 * Check to see whether we still have some data left in the FIFO -
569 * this catches DMA controllers which are unable to monitor the
570 * DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
571 * contiguous buffers. On TX, we'll get a FIFO underrun error.
573 if (status & MCI_RXDATAAVLBLMASK) {
574 mmci_dma_data_error(host);
579 if (!data->host_cookie)
580 mmci_dma_unmap(host, data);
583 * Use of DMA with scatter-gather is impossible.
584 * Give up with DMA and switch back to PIO mode.
586 if (status & MCI_RXDATAAVLBLMASK) {
587 dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
588 mmci_dma_release(host);
591 host->dma_in_progress = false;
592 host->dma_current = NULL;
593 host->dma_desc_current = NULL;
596 /* prepares DMA channel and DMA descriptor, returns non-zero on failure */
597 static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
598 struct dma_chan **dma_chan,
599 struct dma_async_tx_descriptor **dma_desc)
601 struct variant_data *variant = host->variant;
602 struct dma_slave_config conf = {
603 .src_addr = host->phybase + MMCIFIFO,
604 .dst_addr = host->phybase + MMCIFIFO,
605 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
606 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
607 .src_maxburst = variant->fifohalfsize >> 2, /* # of words */
608 .dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
611 struct dma_chan *chan;
612 struct dma_device *device;
613 struct dma_async_tx_descriptor *desc;
615 unsigned long flags = DMA_CTRL_ACK;
617 if (data->flags & MMC_DATA_READ) {
618 conf.direction = DMA_DEV_TO_MEM;
619 chan = host->dma_rx_channel;
621 conf.direction = DMA_MEM_TO_DEV;
622 chan = host->dma_tx_channel;
625 /* If there's no DMA channel, fall back to PIO */
629 /* If less than or equal to the fifo size, don't bother with DMA */
630 if (data->blksz * data->blocks <= variant->fifosize)
633 device = chan->device;
634 nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len,
635 mmc_get_dma_dir(data));
639 if (host->variant->qcom_dml)
640 flags |= DMA_PREP_INTERRUPT;
642 dmaengine_slave_config(chan, &conf);
643 desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
644 conf.direction, flags);
654 dma_unmap_sg(device->dev, data->sg, data->sg_len,
655 mmc_get_dma_dir(data));
659 static inline int mmci_dma_prep_data(struct mmci_host *host,
660 struct mmc_data *data)
662 /* Check if next job is already prepared. */
663 if (host->dma_current && host->dma_desc_current)
666 /* No job were prepared thus do it now. */
667 return __mmci_dma_prep_data(host, data, &host->dma_current,
668 &host->dma_desc_current);
671 static inline int mmci_dma_prep_next(struct mmci_host *host,
672 struct mmc_data *data)
674 struct mmci_host_next *nd = &host->next_data;
675 return __mmci_dma_prep_data(host, data, &nd->dma_chan, &nd->dma_desc);
678 static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
681 struct mmc_data *data = host->data;
683 ret = mmci_dma_prep_data(host, host->data);
687 /* Okay, go for it. */
688 dev_vdbg(mmc_dev(host->mmc),
689 "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
690 data->sg_len, data->blksz, data->blocks, data->flags);
691 host->dma_in_progress = true;
692 dmaengine_submit(host->dma_desc_current);
693 dma_async_issue_pending(host->dma_current);
695 if (host->variant->qcom_dml)
696 dml_start_xfer(host, data);
698 datactrl |= MCI_DPSM_DMAENABLE;
700 /* Trigger the DMA transfer */
701 mmci_write_datactrlreg(host, datactrl);
704 * Let the MMCI say when the data is ended and it's time
705 * to fire next DMA request. When that happens, MMCI will
706 * call mmci_data_end()
708 writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
709 host->base + MMCIMASK0);
713 static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
715 struct mmci_host_next *next = &host->next_data;
717 WARN_ON(data->host_cookie && data->host_cookie != next->cookie);
718 WARN_ON(!data->host_cookie && (next->dma_desc || next->dma_chan));
720 host->dma_desc_current = next->dma_desc;
721 host->dma_current = next->dma_chan;
722 next->dma_desc = NULL;
723 next->dma_chan = NULL;
726 static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
728 struct mmci_host *host = mmc_priv(mmc);
729 struct mmc_data *data = mrq->data;
730 struct mmci_host_next *nd = &host->next_data;
735 BUG_ON(data->host_cookie);
737 if (mmci_validate_data(host, data))
740 if (!mmci_dma_prep_next(host, data))
741 data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie;
744 static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
747 struct mmci_host *host = mmc_priv(mmc);
748 struct mmc_data *data = mrq->data;
750 if (!data || !data->host_cookie)
753 mmci_dma_unmap(host, data);
756 struct mmci_host_next *next = &host->next_data;
757 struct dma_chan *chan;
758 if (data->flags & MMC_DATA_READ)
759 chan = host->dma_rx_channel;
761 chan = host->dma_tx_channel;
762 dmaengine_terminate_all(chan);
764 if (host->dma_desc_current == next->dma_desc)
765 host->dma_desc_current = NULL;
767 if (host->dma_current == next->dma_chan) {
768 host->dma_in_progress = false;
769 host->dma_current = NULL;
772 next->dma_desc = NULL;
773 next->dma_chan = NULL;
774 data->host_cookie = 0;
779 /* Blank functions if the DMA engine is not available */
780 static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
783 static inline void mmci_dma_setup(struct mmci_host *host)
787 static inline void mmci_dma_release(struct mmci_host *host)
791 static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
795 static inline void mmci_dma_finalize(struct mmci_host *host,
796 struct mmc_data *data)
800 static inline void mmci_dma_data_error(struct mmci_host *host)
804 static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
809 #define mmci_pre_request NULL
810 #define mmci_post_request NULL
814 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
816 struct variant_data *variant = host->variant;
817 unsigned int datactrl, timeout, irqmask;
818 unsigned long long clks;
822 dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n",
823 data->blksz, data->blocks, data->flags);
826 host->size = data->blksz * data->blocks;
827 data->bytes_xfered = 0;
829 clks = (unsigned long long)data->timeout_ns * host->cclk;
830 do_div(clks, NSEC_PER_SEC);
832 timeout = data->timeout_clks + (unsigned int)clks;
835 writel(timeout, base + MMCIDATATIMER);
836 writel(host->size, base + MMCIDATALENGTH);
838 blksz_bits = ffs(data->blksz) - 1;
839 BUG_ON(1 << blksz_bits != data->blksz);
841 if (variant->blksz_datactrl16)
842 datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
843 else if (variant->blksz_datactrl4)
844 datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
846 datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
848 if (data->flags & MMC_DATA_READ)
849 datactrl |= MCI_DPSM_DIRECTION;
851 if (host->mmc->card && mmc_card_sdio(host->mmc->card)) {
854 datactrl |= variant->datactrl_mask_sdio;
857 * The ST Micro variant for SDIO small write transfers
858 * needs to have clock H/W flow control disabled,
859 * otherwise the transfer will not start. The threshold
860 * depends on the rate of MCLK.
862 if (variant->st_sdio && data->flags & MMC_DATA_WRITE &&
864 (host->size <= 8 && host->mclk > 50000000)))
865 clk = host->clk_reg & ~variant->clkreg_enable;
867 clk = host->clk_reg | variant->clkreg_enable;
869 mmci_write_clkreg(host, clk);
872 if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
873 host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
874 datactrl |= variant->datactrl_mask_ddrmode;
877 * Attempt to use DMA operation mode, if this
878 * should fail, fall back to PIO mode
880 if (!mmci_dma_start_data(host, datactrl))
883 /* IRQ mode, map the SG list for CPU reading/writing */
884 mmci_init_sg(host, data);
886 if (data->flags & MMC_DATA_READ) {
887 irqmask = MCI_RXFIFOHALFFULLMASK;
890 * If we have less than the fifo 'half-full' threshold to
891 * transfer, trigger a PIO interrupt as soon as any data
894 if (host->size < variant->fifohalfsize)
895 irqmask |= MCI_RXDATAAVLBLMASK;
898 * We don't actually need to include "FIFO empty" here
899 * since its implicit in "FIFO half empty".
901 irqmask = MCI_TXFIFOHALFEMPTYMASK;
904 mmci_write_datactrlreg(host, datactrl);
905 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
906 mmci_set_mask1(host, irqmask);
910 mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
912 void __iomem *base = host->base;
914 dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
915 cmd->opcode, cmd->arg, cmd->flags);
917 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
918 writel(0, base + MMCICOMMAND);
919 mmci_reg_delay(host);
922 c |= cmd->opcode | MCI_CPSM_ENABLE;
923 if (cmd->flags & MMC_RSP_PRESENT) {
924 if (cmd->flags & MMC_RSP_136)
925 c |= MCI_CPSM_LONGRSP;
926 c |= MCI_CPSM_RESPONSE;
929 c |= MCI_CPSM_INTERRUPT;
931 if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
932 c |= host->variant->data_cmd_enable;
936 writel(cmd->arg, base + MMCIARGUMENT);
937 writel(c, base + MMCICOMMAND);
941 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
944 /* Make sure we have data to handle */
948 /* First check for errors */
949 if (status & (MCI_DATACRCFAIL | MCI_DATATIMEOUT |
950 host->variant->start_err |
951 MCI_TXUNDERRUN | MCI_RXOVERRUN)) {
954 /* Terminate the DMA transfer */
955 if (dma_inprogress(host)) {
956 mmci_dma_data_error(host);
957 mmci_dma_unmap(host, data);
961 * Calculate how far we are into the transfer. Note that
962 * the data counter gives the number of bytes transferred
963 * on the MMC bus, not on the host side. On reads, this
964 * can be as much as a FIFO-worth of data ahead. This
965 * matters for FIFO overruns only.
967 remain = readl(host->base + MMCIDATACNT);
968 success = data->blksz * data->blocks - remain;
970 dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
972 if (status & MCI_DATACRCFAIL) {
973 /* Last block was not successful */
975 data->error = -EILSEQ;
976 } else if (status & MCI_DATATIMEOUT) {
977 data->error = -ETIMEDOUT;
978 } else if (status & MCI_STARTBITERR) {
979 data->error = -ECOMM;
980 } else if (status & MCI_TXUNDERRUN) {
982 } else if (status & MCI_RXOVERRUN) {
983 if (success > host->variant->fifosize)
984 success -= host->variant->fifosize;
989 data->bytes_xfered = round_down(success, data->blksz);
992 if (status & MCI_DATABLOCKEND)
993 dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
995 if (status & MCI_DATAEND || data->error) {
996 if (dma_inprogress(host))
997 mmci_dma_finalize(host, data);
998 mmci_stop_data(host);
1001 /* The error clause is handled above, success! */
1002 data->bytes_xfered = data->blksz * data->blocks;
1004 if (!data->stop || host->mrq->sbc) {
1005 mmci_request_end(host, data->mrq);
1007 mmci_start_command(host, data->stop, 0);
1013 mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
1014 unsigned int status)
1016 void __iomem *base = host->base;
1022 sbc = (cmd == host->mrq->sbc);
1025 * We need to be one of these interrupts to be considered worth
1026 * handling. Note that we tag on any latent IRQs postponed
1027 * due to waiting for busy status.
1029 if (!((status|host->busy_status) &
1030 (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND)))
1034 * ST Micro variant: handle busy detection.
1036 if (host->variant->busy_detect) {
1037 bool busy_resp = !!(cmd->flags & MMC_RSP_BUSY);
1039 /* We are busy with a command, return */
1040 if (host->busy_status &&
1041 (status & host->variant->busy_detect_flag))
1045 * We were not busy, but we now got a busy response on
1046 * something that was not an error, and we double-check
1047 * that the special busy status bit is still set before
1050 if (!host->busy_status && busy_resp &&
1051 !(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) &&
1052 (readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) {
1054 /* Clear the busy start IRQ */
1055 writel(host->variant->busy_detect_mask,
1056 host->base + MMCICLEAR);
1058 /* Unmask the busy end IRQ */
1059 writel(readl(base + MMCIMASK0) |
1060 host->variant->busy_detect_mask,
1063 * Now cache the last response status code (until
1064 * the busy bit goes low), and return.
1067 status & (MCI_CMDSENT|MCI_CMDRESPEND);
1072 * At this point we are not busy with a command, we have
1073 * not received a new busy request, clear and mask the busy
1074 * end IRQ and fall through to process the IRQ.
1076 if (host->busy_status) {
1078 writel(host->variant->busy_detect_mask,
1079 host->base + MMCICLEAR);
1081 writel(readl(base + MMCIMASK0) &
1082 ~host->variant->busy_detect_mask,
1084 host->busy_status = 0;
1090 if (status & MCI_CMDTIMEOUT) {
1091 cmd->error = -ETIMEDOUT;
1092 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
1093 cmd->error = -EILSEQ;
1095 cmd->resp[0] = readl(base + MMCIRESPONSE0);
1096 cmd->resp[1] = readl(base + MMCIRESPONSE1);
1097 cmd->resp[2] = readl(base + MMCIRESPONSE2);
1098 cmd->resp[3] = readl(base + MMCIRESPONSE3);
1101 if ((!sbc && !cmd->data) || cmd->error) {
1103 /* Terminate the DMA transfer */
1104 if (dma_inprogress(host)) {
1105 mmci_dma_data_error(host);
1106 mmci_dma_unmap(host, host->data);
1108 mmci_stop_data(host);
1110 mmci_request_end(host, host->mrq);
1112 mmci_start_command(host, host->mrq->cmd, 0);
1113 } else if (!(cmd->data->flags & MMC_DATA_READ)) {
1114 mmci_start_data(host, cmd->data);
1118 static int mmci_get_rx_fifocnt(struct mmci_host *host, u32 status, int remain)
1120 return remain - (readl(host->base + MMCIFIFOCNT) << 2);
1123 static int mmci_qcom_get_rx_fifocnt(struct mmci_host *host, u32 status, int r)
1126 * on qcom SDCC4 only 8 words are used in each burst so only 8 addresses
1127 * from the fifo range should be used
1129 if (status & MCI_RXFIFOHALFFULL)
1130 return host->variant->fifohalfsize;
1131 else if (status & MCI_RXDATAAVLBL)
1137 static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
1139 void __iomem *base = host->base;
1141 u32 status = readl(host->base + MMCISTATUS);
1142 int host_remain = host->size;
1145 int count = host->get_rx_fifocnt(host, status, host_remain);
1154 * SDIO especially may want to send something that is
1155 * not divisible by 4 (as opposed to card sectors
1156 * etc). Therefore make sure to always read the last bytes
1157 * while only doing full 32-bit reads towards the FIFO.
1159 if (unlikely(count & 0x3)) {
1161 unsigned char buf[4];
1162 ioread32_rep(base + MMCIFIFO, buf, 1);
1163 memcpy(ptr, buf, count);
1165 ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
1169 ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
1174 host_remain -= count;
1179 status = readl(base + MMCISTATUS);
1180 } while (status & MCI_RXDATAAVLBL);
1182 return ptr - buffer;
1185 static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
1187 struct variant_data *variant = host->variant;
1188 void __iomem *base = host->base;
1192 unsigned int count, maxcnt;
1194 maxcnt = status & MCI_TXFIFOEMPTY ?
1195 variant->fifosize : variant->fifohalfsize;
1196 count = min(remain, maxcnt);
1199 * SDIO especially may want to send something that is
1200 * not divisible by 4 (as opposed to card sectors
1201 * etc), and the FIFO only accept full 32-bit writes.
1202 * So compensate by adding +3 on the count, a single
1203 * byte become a 32bit write, 7 bytes will be two
1206 iowrite32_rep(base + MMCIFIFO, ptr, (count + 3) >> 2);
1214 status = readl(base + MMCISTATUS);
1215 } while (status & MCI_TXFIFOHALFEMPTY);
1217 return ptr - buffer;
1221 * PIO data transfer IRQ handler.
1223 static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
1225 struct mmci_host *host = dev_id;
1226 struct sg_mapping_iter *sg_miter = &host->sg_miter;
1227 struct variant_data *variant = host->variant;
1228 void __iomem *base = host->base;
1229 unsigned long flags;
1232 status = readl(base + MMCISTATUS);
1234 dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
1236 local_irq_save(flags);
1239 unsigned int remain, len;
1243 * For write, we only need to test the half-empty flag
1244 * here - if the FIFO is completely empty, then by
1245 * definition it is more than half empty.
1247 * For read, check for data available.
1249 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
1252 if (!sg_miter_next(sg_miter))
1255 buffer = sg_miter->addr;
1256 remain = sg_miter->length;
1259 if (status & MCI_RXACTIVE)
1260 len = mmci_pio_read(host, buffer, remain);
1261 if (status & MCI_TXACTIVE)
1262 len = mmci_pio_write(host, buffer, remain, status);
1264 sg_miter->consumed = len;
1272 status = readl(base + MMCISTATUS);
1275 sg_miter_stop(sg_miter);
1277 local_irq_restore(flags);
1280 * If we have less than the fifo 'half-full' threshold to transfer,
1281 * trigger a PIO interrupt as soon as any data is available.
1283 if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
1284 mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
1287 * If we run out of data, disable the data IRQs; this
1288 * prevents a race where the FIFO becomes empty before
1289 * the chip itself has disabled the data path, and
1290 * stops us racing with our data end IRQ.
1292 if (host->size == 0) {
1293 mmci_set_mask1(host, 0);
1294 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
1301 * Handle completion of command and data transfers.
1303 static irqreturn_t mmci_irq(int irq, void *dev_id)
1305 struct mmci_host *host = dev_id;
1309 spin_lock(&host->lock);
1312 status = readl(host->base + MMCISTATUS);
1314 if (host->singleirq) {
1315 if (status & host->mask1_reg)
1316 mmci_pio_irq(irq, dev_id);
1318 status &= ~MCI_IRQ1MASK;
1322 * We intentionally clear the MCI_ST_CARDBUSY IRQ (if it's
1323 * enabled) in mmci_cmd_irq() function where ST Micro busy
1324 * detection variant is handled. Considering the HW seems to be
1325 * triggering the IRQ on both edges while monitoring DAT0 for
1326 * busy completion and that same status bit is used to monitor
1327 * start and end of busy detection, special care must be taken
1328 * to make sure that both start and end interrupts are always
1329 * cleared one after the other.
1331 status &= readl(host->base + MMCIMASK0);
1332 if (host->variant->busy_detect)
1333 writel(status & ~host->variant->busy_detect_mask,
1334 host->base + MMCICLEAR);
1336 writel(status, host->base + MMCICLEAR);
1338 dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status);
1340 if (host->variant->reversed_irq_handling) {
1341 mmci_data_irq(host, host->data, status);
1342 mmci_cmd_irq(host, host->cmd, status);
1344 mmci_cmd_irq(host, host->cmd, status);
1345 mmci_data_irq(host, host->data, status);
1349 * Don't poll for busy completion in irq context.
1351 if (host->variant->busy_detect && host->busy_status)
1352 status &= ~host->variant->busy_detect_flag;
1357 spin_unlock(&host->lock);
1359 return IRQ_RETVAL(ret);
1362 static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1364 struct mmci_host *host = mmc_priv(mmc);
1365 unsigned long flags;
1367 WARN_ON(host->mrq != NULL);
1369 mrq->cmd->error = mmci_validate_data(host, mrq->data);
1370 if (mrq->cmd->error) {
1371 mmc_request_done(mmc, mrq);
1375 spin_lock_irqsave(&host->lock, flags);
1380 mmci_get_next_data(host, mrq->data);
1382 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
1383 mmci_start_data(host, mrq->data);
1386 mmci_start_command(host, mrq->sbc, 0);
1388 mmci_start_command(host, mrq->cmd, 0);
1390 spin_unlock_irqrestore(&host->lock, flags);
1393 static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1395 struct mmci_host *host = mmc_priv(mmc);
1396 struct variant_data *variant = host->variant;
1398 unsigned long flags;
1401 if (host->plat->ios_handler &&
1402 host->plat->ios_handler(mmc_dev(mmc), ios))
1403 dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
1405 switch (ios->power_mode) {
1407 if (!IS_ERR(mmc->supply.vmmc))
1408 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1410 if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
1411 regulator_disable(mmc->supply.vqmmc);
1412 host->vqmmc_enabled = false;
1417 if (!IS_ERR(mmc->supply.vmmc))
1418 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1421 * The ST Micro variant doesn't have the PL180s MCI_PWR_UP
1422 * and instead uses MCI_PWR_ON so apply whatever value is
1423 * configured in the variant data.
1425 pwr |= variant->pwrreg_powerup;
1429 if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
1430 ret = regulator_enable(mmc->supply.vqmmc);
1432 dev_err(mmc_dev(mmc),
1433 "failed to enable vqmmc regulator\n");
1435 host->vqmmc_enabled = true;
1442 if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) {
1444 * The ST Micro variant has some additional bits
1445 * indicating signal direction for the signals in
1446 * the SD/MMC bus and feedback-clock usage.
1448 pwr |= host->pwr_reg_add;
1450 if (ios->bus_width == MMC_BUS_WIDTH_4)
1451 pwr &= ~MCI_ST_DATA74DIREN;
1452 else if (ios->bus_width == MMC_BUS_WIDTH_1)
1453 pwr &= (~MCI_ST_DATA74DIREN &
1454 ~MCI_ST_DATA31DIREN &
1455 ~MCI_ST_DATA2DIREN);
1458 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
1459 if (host->hw_designer != AMBA_VENDOR_ST)
1463 * The ST Micro variant use the ROD bit for something
1464 * else and only has OD (Open Drain).
1471 * If clock = 0 and the variant requires the MMCIPOWER to be used for
1472 * gating the clock, the MCI_PWR_ON bit is cleared.
1474 if (!ios->clock && variant->pwrreg_clkgate)
1477 if (host->variant->explicit_mclk_control &&
1478 ios->clock != host->clock_cache) {
1479 ret = clk_set_rate(host->clk, ios->clock);
1481 dev_err(mmc_dev(host->mmc),
1482 "Error setting clock rate (%d)\n", ret);
1484 host->mclk = clk_get_rate(host->clk);
1486 host->clock_cache = ios->clock;
1488 spin_lock_irqsave(&host->lock, flags);
1490 mmci_set_clkreg(host, ios->clock);
1491 mmci_write_pwrreg(host, pwr);
1492 mmci_reg_delay(host);
1494 spin_unlock_irqrestore(&host->lock, flags);
1497 static int mmci_get_cd(struct mmc_host *mmc)
1499 struct mmci_host *host = mmc_priv(mmc);
1500 struct mmci_platform_data *plat = host->plat;
1501 unsigned int status = mmc_gpio_get_cd(mmc);
1503 if (status == -ENOSYS) {
1505 return 1; /* Assume always present */
1507 status = plat->status(mmc_dev(host->mmc));
1512 static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
1516 if (!IS_ERR(mmc->supply.vqmmc)) {
1518 switch (ios->signal_voltage) {
1519 case MMC_SIGNAL_VOLTAGE_330:
1520 ret = regulator_set_voltage(mmc->supply.vqmmc,
1523 case MMC_SIGNAL_VOLTAGE_180:
1524 ret = regulator_set_voltage(mmc->supply.vqmmc,
1527 case MMC_SIGNAL_VOLTAGE_120:
1528 ret = regulator_set_voltage(mmc->supply.vqmmc,
1534 dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
1540 static struct mmc_host_ops mmci_ops = {
1541 .request = mmci_request,
1542 .pre_req = mmci_pre_request,
1543 .post_req = mmci_post_request,
1544 .set_ios = mmci_set_ios,
1545 .get_ro = mmc_gpio_get_ro,
1546 .get_cd = mmci_get_cd,
1547 .start_signal_voltage_switch = mmci_sig_volt_switch,
1550 static int mmci_of_parse(struct device_node *np, struct mmc_host *mmc)
1552 struct mmci_host *host = mmc_priv(mmc);
1553 int ret = mmc_of_parse(mmc);
1558 if (of_get_property(np, "st,sig-dir-dat0", NULL))
1559 host->pwr_reg_add |= MCI_ST_DATA0DIREN;
1560 if (of_get_property(np, "st,sig-dir-dat2", NULL))
1561 host->pwr_reg_add |= MCI_ST_DATA2DIREN;
1562 if (of_get_property(np, "st,sig-dir-dat31", NULL))
1563 host->pwr_reg_add |= MCI_ST_DATA31DIREN;
1564 if (of_get_property(np, "st,sig-dir-dat74", NULL))
1565 host->pwr_reg_add |= MCI_ST_DATA74DIREN;
1566 if (of_get_property(np, "st,sig-dir-cmd", NULL))
1567 host->pwr_reg_add |= MCI_ST_CMDDIREN;
1568 if (of_get_property(np, "st,sig-pin-fbclk", NULL))
1569 host->pwr_reg_add |= MCI_ST_FBCLKEN;
1571 if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
1572 mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
1573 if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
1574 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1579 static int mmci_probe(struct amba_device *dev,
1580 const struct amba_id *id)
1582 struct mmci_platform_data *plat = dev->dev.platform_data;
1583 struct device_node *np = dev->dev.of_node;
1584 struct variant_data *variant = id->data;
1585 struct mmci_host *host;
1586 struct mmc_host *mmc;
1589 /* Must have platform data or Device Tree. */
1591 dev_err(&dev->dev, "No plat data or DT found\n");
1596 plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL);
1601 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
1605 ret = mmci_of_parse(np, mmc);
1609 host = mmc_priv(mmc);
1612 host->hw_designer = amba_manf(dev);
1613 host->hw_revision = amba_rev(dev);
1614 dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer);
1615 dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision);
1617 host->clk = devm_clk_get(&dev->dev, NULL);
1618 if (IS_ERR(host->clk)) {
1619 ret = PTR_ERR(host->clk);
1623 ret = clk_prepare_enable(host->clk);
1627 if (variant->qcom_fifo)
1628 host->get_rx_fifocnt = mmci_qcom_get_rx_fifocnt;
1630 host->get_rx_fifocnt = mmci_get_rx_fifocnt;
1633 host->variant = variant;
1634 host->mclk = clk_get_rate(host->clk);
1636 * According to the spec, mclk is max 100 MHz,
1637 * so we try to adjust the clock down to this,
1640 if (host->mclk > variant->f_max) {
1641 ret = clk_set_rate(host->clk, variant->f_max);
1644 host->mclk = clk_get_rate(host->clk);
1645 dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
1649 host->phybase = dev->res.start;
1650 host->base = devm_ioremap_resource(&dev->dev, &dev->res);
1651 if (IS_ERR(host->base)) {
1652 ret = PTR_ERR(host->base);
1657 * The ARM and ST versions of the block have slightly different
1658 * clock divider equations which means that the minimum divider
1660 * on Qualcomm like controllers get the nearest minimum clock to 100Khz
1662 if (variant->st_clkdiv)
1663 mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
1664 else if (variant->explicit_mclk_control)
1665 mmc->f_min = clk_round_rate(host->clk, 100000);
1667 mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
1669 * If no maximum operating frequency is supplied, fall back to use
1670 * the module parameter, which has a (low) default value in case it
1671 * is not specified. Either value must not exceed the clock rate into
1672 * the block, of course.
1675 mmc->f_max = variant->explicit_mclk_control ?
1676 min(variant->f_max, mmc->f_max) :
1677 min(host->mclk, mmc->f_max);
1679 mmc->f_max = variant->explicit_mclk_control ?
1680 fmax : min(host->mclk, fmax);
1683 dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
1685 /* Get regulators and the supported OCR mask */
1686 ret = mmc_regulator_get_supply(mmc);
1690 if (!mmc->ocr_avail)
1691 mmc->ocr_avail = plat->ocr_mask;
1692 else if (plat->ocr_mask)
1693 dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
1695 /* DT takes precedence over platform data. */
1697 if (!plat->cd_invert)
1698 mmc->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
1699 mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
1702 /* We support these capabilities. */
1703 mmc->caps |= MMC_CAP_CMD23;
1706 * Enable busy detection.
1708 if (variant->busy_detect) {
1709 mmci_ops.card_busy = mmci_card_busy;
1711 * Not all variants have a flag to enable busy detection
1712 * in the DPSM, but if they do, set it here.
1714 if (variant->busy_dpsm_flag)
1715 mmci_write_datactrlreg(host,
1716 host->variant->busy_dpsm_flag);
1717 mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
1718 mmc->max_busy_timeout = 0;
1721 mmc->ops = &mmci_ops;
1723 /* We support these PM capabilities. */
1724 mmc->pm_caps |= MMC_PM_KEEP_POWER;
1729 mmc->max_segs = NR_SG;
1732 * Since only a certain number of bits are valid in the data length
1733 * register, we must ensure that we don't exceed 2^num-1 bytes in a
1736 mmc->max_req_size = (1 << variant->datalength_bits) - 1;
1739 * Set the maximum segment size. Since we aren't doing DMA
1740 * (yet) we are only limited by the data length register.
1742 mmc->max_seg_size = mmc->max_req_size;
1745 * Block size can be up to 2048 bytes, but must be a power of two.
1747 mmc->max_blk_size = 1 << 11;
1750 * Limit the number of blocks transferred so that we don't overflow
1751 * the maximum request size.
1753 mmc->max_blk_count = mmc->max_req_size >> 11;
1755 spin_lock_init(&host->lock);
1757 writel(0, host->base + MMCIMASK0);
1759 if (variant->mmcimask1)
1760 writel(0, host->base + MMCIMASK1);
1762 writel(0xfff, host->base + MMCICLEAR);
1766 * - not using DT but using a descriptor table, or
1767 * - using a table of descriptors ALONGSIDE DT, or
1768 * look up these descriptors named "cd" and "wp" right here, fail
1769 * silently of these do not exist and proceed to try platform data
1772 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
1774 if (ret == -EPROBE_DEFER)
1776 else if (gpio_is_valid(plat->gpio_cd)) {
1777 ret = mmc_gpio_request_cd(mmc, plat->gpio_cd, 0);
1783 ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL);
1785 if (ret == -EPROBE_DEFER)
1787 else if (gpio_is_valid(plat->gpio_wp)) {
1788 ret = mmc_gpio_request_ro(mmc, plat->gpio_wp);
1795 ret = devm_request_irq(&dev->dev, dev->irq[0], mmci_irq, IRQF_SHARED,
1796 DRIVER_NAME " (cmd)", host);
1801 host->singleirq = true;
1803 ret = devm_request_irq(&dev->dev, dev->irq[1], mmci_pio_irq,
1804 IRQF_SHARED, DRIVER_NAME " (pio)", host);
1809 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
1811 amba_set_drvdata(dev, mmc);
1813 dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
1814 mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
1815 amba_rev(dev), (unsigned long long)dev->res.start,
1816 dev->irq[0], dev->irq[1]);
1818 mmci_dma_setup(host);
1820 pm_runtime_set_autosuspend_delay(&dev->dev, 50);
1821 pm_runtime_use_autosuspend(&dev->dev);
1825 pm_runtime_put(&dev->dev);
1829 clk_disable_unprepare(host->clk);
1835 static int mmci_remove(struct amba_device *dev)
1837 struct mmc_host *mmc = amba_get_drvdata(dev);
1840 struct mmci_host *host = mmc_priv(mmc);
1841 struct variant_data *variant = host->variant;
1844 * Undo pm_runtime_put() in probe. We use the _sync
1845 * version here so that we can access the primecell.
1847 pm_runtime_get_sync(&dev->dev);
1849 mmc_remove_host(mmc);
1851 writel(0, host->base + MMCIMASK0);
1853 if (variant->mmcimask1)
1854 writel(0, host->base + MMCIMASK1);
1856 writel(0, host->base + MMCICOMMAND);
1857 writel(0, host->base + MMCIDATACTRL);
1859 mmci_dma_release(host);
1860 clk_disable_unprepare(host->clk);
1868 static void mmci_save(struct mmci_host *host)
1870 unsigned long flags;
1872 spin_lock_irqsave(&host->lock, flags);
1874 writel(0, host->base + MMCIMASK0);
1875 if (host->variant->pwrreg_nopower) {
1876 writel(0, host->base + MMCIDATACTRL);
1877 writel(0, host->base + MMCIPOWER);
1878 writel(0, host->base + MMCICLOCK);
1880 mmci_reg_delay(host);
1882 spin_unlock_irqrestore(&host->lock, flags);
1885 static void mmci_restore(struct mmci_host *host)
1887 unsigned long flags;
1889 spin_lock_irqsave(&host->lock, flags);
1891 if (host->variant->pwrreg_nopower) {
1892 writel(host->clk_reg, host->base + MMCICLOCK);
1893 writel(host->datactrl_reg, host->base + MMCIDATACTRL);
1894 writel(host->pwr_reg, host->base + MMCIPOWER);
1896 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
1897 mmci_reg_delay(host);
1899 spin_unlock_irqrestore(&host->lock, flags);
1902 static int mmci_runtime_suspend(struct device *dev)
1904 struct amba_device *adev = to_amba_device(dev);
1905 struct mmc_host *mmc = amba_get_drvdata(adev);
1908 struct mmci_host *host = mmc_priv(mmc);
1909 pinctrl_pm_select_sleep_state(dev);
1911 clk_disable_unprepare(host->clk);
1917 static int mmci_runtime_resume(struct device *dev)
1919 struct amba_device *adev = to_amba_device(dev);
1920 struct mmc_host *mmc = amba_get_drvdata(adev);
1923 struct mmci_host *host = mmc_priv(mmc);
1924 clk_prepare_enable(host->clk);
1926 pinctrl_pm_select_default_state(dev);
1933 static const struct dev_pm_ops mmci_dev_pm_ops = {
1934 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1935 pm_runtime_force_resume)
1936 SET_RUNTIME_PM_OPS(mmci_runtime_suspend, mmci_runtime_resume, NULL)
1939 static const struct amba_id mmci_ids[] = {
1943 .data = &variant_arm,
1948 .data = &variant_arm_extended_fifo,
1953 .data = &variant_arm_extended_fifo_hwfc,
1958 .data = &variant_arm,
1960 /* ST Micro variants */
1964 .data = &variant_u300,
1969 .data = &variant_nomadik,
1974 .data = &variant_nomadik,
1979 .data = &variant_ux500,
1984 .data = &variant_ux500v2,
1986 /* Qualcomm variants */
1990 .data = &variant_qcom,
1995 MODULE_DEVICE_TABLE(amba, mmci_ids);
1997 static struct amba_driver mmci_driver = {
1999 .name = DRIVER_NAME,
2000 .pm = &mmci_dev_pm_ops,
2002 .probe = mmci_probe,
2003 .remove = mmci_remove,
2004 .id_table = mmci_ids,
2007 module_amba_driver(mmci_driver);
2009 module_param(fmax, uint, 0444);
2011 MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
2012 MODULE_LICENSE("GPL");