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linux/drivers/mmc/host/mmci.c
Ulf Hansson 8d94b54d99 mmc: mmci: Enable support for busy detection for ux500 variant 
The ux500 variants have HW busy detection support, which is indicated
by the busy_detect flag. For these variants let's enable the
MMC_CAP_WAIT_WHILE_BUSY flag and add the support for it.

The mmc core will provide the RSP_BUSY command flag for those requests
we should care about busy detection. Regarding the max_busy_timeout,
the HW don't support busy detection timeouts so at this initial step
let's make it simple and set it to zero to indicate we are able to
support any timeout.

Cc: Russell King <linux@arm.linux.org.uk>
Cc: Johan Rudholm <jrudholm@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
2014-02-23 10:41:21 -05:00

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/*
* linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
*
* Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
* Copyright (C) 2010 ST-Ericsson SA
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/log2.h>
#include <linux/mmc/pm.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>
#include <linux/scatterlist.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/amba/mmci.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <linux/pinctrl/consumer.h>
#include <asm/div64.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include "mmci.h"
#define DRIVER_NAME "mmci-pl18x"
static unsigned int fmax = 515633;
/**
* struct variant_data - MMCI variant-specific quirks
* @clkreg: default value for MCICLOCK register
* @clkreg_enable: enable value for MMCICLOCK register
* @datalength_bits: number of bits in the MMCIDATALENGTH register
* @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY
* is asserted (likewise for RX)
* @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY
* is asserted (likewise for RX)
* @sdio: variant supports SDIO
* @st_clkdiv: true if using a ST-specific clock divider algorithm
* @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register
* @pwrreg_powerup: power up value for MMCIPOWER register
* @signal_direction: input/out direction of bus signals can be indicated
* @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock
* @busy_detect: true if busy detection on dat0 is supported
* @pwrreg_nopower: bits in MMCIPOWER don't controls ext. power supply
*/
struct variant_data {
unsigned int clkreg;
unsigned int clkreg_enable;
unsigned int datalength_bits;
unsigned int fifosize;
unsigned int fifohalfsize;
bool sdio;
bool st_clkdiv;
bool blksz_datactrl16;
u32 pwrreg_powerup;
bool signal_direction;
bool pwrreg_clkgate;
bool busy_detect;
bool pwrreg_nopower;
};
static struct variant_data variant_arm = {
.fifosize = 16 * 4,
.fifohalfsize = 8 * 4,
.datalength_bits = 16,
.pwrreg_powerup = MCI_PWR_UP,
};
static struct variant_data variant_arm_extended_fifo = {
.fifosize = 128 * 4,
.fifohalfsize = 64 * 4,
.datalength_bits = 16,
.pwrreg_powerup = MCI_PWR_UP,
};
static struct variant_data variant_arm_extended_fifo_hwfc = {
.fifosize = 128 * 4,
.fifohalfsize = 64 * 4,
.clkreg_enable = MCI_ARM_HWFCEN,
.datalength_bits = 16,
.pwrreg_powerup = MCI_PWR_UP,
};
static struct variant_data variant_u300 = {
.fifosize = 16 * 4,
.fifohalfsize = 8 * 4,
.clkreg_enable = MCI_ST_U300_HWFCEN,
.datalength_bits = 16,
.sdio = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
.pwrreg_nopower = true,
};
static struct variant_data variant_nomadik = {
.fifosize = 16 * 4,
.fifohalfsize = 8 * 4,
.clkreg = MCI_CLK_ENABLE,
.datalength_bits = 24,
.sdio = true,
.st_clkdiv = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
.pwrreg_nopower = true,
};
static struct variant_data variant_ux500 = {
.fifosize = 30 * 4,
.fifohalfsize = 8 * 4,
.clkreg = MCI_CLK_ENABLE,
.clkreg_enable = MCI_ST_UX500_HWFCEN,
.datalength_bits = 24,
.sdio = true,
.st_clkdiv = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
.busy_detect = true,
.pwrreg_nopower = true,
};
static struct variant_data variant_ux500v2 = {
.fifosize = 30 * 4,
.fifohalfsize = 8 * 4,
.clkreg = MCI_CLK_ENABLE,
.clkreg_enable = MCI_ST_UX500_HWFCEN,
.datalength_bits = 24,
.sdio = true,
.st_clkdiv = true,
.blksz_datactrl16 = true,
.pwrreg_powerup = MCI_PWR_ON,
.signal_direction = true,
.pwrreg_clkgate = true,
.busy_detect = true,
.pwrreg_nopower = true,
};
static int mmci_card_busy(struct mmc_host *mmc)
{
struct mmci_host *host = mmc_priv(mmc);
unsigned long flags;
int busy = 0;
pm_runtime_get_sync(mmc_dev(mmc));
spin_lock_irqsave(&host->lock, flags);
if (readl(host->base + MMCISTATUS) & MCI_ST_CARDBUSY)
busy = 1;
spin_unlock_irqrestore(&host->lock, flags);
pm_runtime_mark_last_busy(mmc_dev(mmc));
pm_runtime_put_autosuspend(mmc_dev(mmc));
return busy;
}
/*
* Validate mmc prerequisites
*/
static int mmci_validate_data(struct mmci_host *host,
struct mmc_data *data)
{
if (!data)
return 0;
if (!is_power_of_2(data->blksz)) {
dev_err(mmc_dev(host->mmc),
"unsupported block size (%d bytes)\n", data->blksz);
return -EINVAL;
}
return 0;
}
static void mmci_reg_delay(struct mmci_host *host)
{
/*
* According to the spec, at least three feedback clock cycles
* of max 52 MHz must pass between two writes to the MMCICLOCK reg.
* Three MCLK clock cycles must pass between two MMCIPOWER reg writes.
* Worst delay time during card init is at 100 kHz => 30 us.
* Worst delay time when up and running is at 25 MHz => 120 ns.
*/
if (host->cclk < 25000000)
udelay(30);
else
ndelay(120);
}
/*
* This must be called with host->lock held
*/
static void mmci_write_clkreg(struct mmci_host *host, u32 clk)
{
if (host->clk_reg != clk) {
host->clk_reg = clk;
writel(clk, host->base + MMCICLOCK);
}
}
/*
* This must be called with host->lock held
*/
static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
{
if (host->pwr_reg != pwr) {
host->pwr_reg = pwr;
writel(pwr, host->base + MMCIPOWER);
}
}
/*
* This must be called with host->lock held
*/
static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
{
/* Keep ST Micro busy mode if enabled */
datactrl |= host->datactrl_reg & MCI_ST_DPSM_BUSYMODE;
if (host->datactrl_reg != datactrl) {
host->datactrl_reg = datactrl;
writel(datactrl, host->base + MMCIDATACTRL);
}
}
/*
* This must be called with host->lock held
*/
static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
{
struct variant_data *variant = host->variant;
u32 clk = variant->clkreg;
/* Make sure cclk reflects the current calculated clock */
host->cclk = 0;
if (desired) {
if (desired >= host->mclk) {
clk = MCI_CLK_BYPASS;
if (variant->st_clkdiv)
clk |= MCI_ST_UX500_NEG_EDGE;
host->cclk = host->mclk;
} else if (variant->st_clkdiv) {
/*
* DB8500 TRM says f = mclk / (clkdiv + 2)
* => clkdiv = (mclk / f) - 2
* Round the divider up so we don't exceed the max
* frequency
*/
clk = DIV_ROUND_UP(host->mclk, desired) - 2;
if (clk >= 256)
clk = 255;
host->cclk = host->mclk / (clk + 2);
} else {
/*
* PL180 TRM says f = mclk / (2 * (clkdiv + 1))
* => clkdiv = mclk / (2 * f) - 1
*/
clk = host->mclk / (2 * desired) - 1;
if (clk >= 256)
clk = 255;
host->cclk = host->mclk / (2 * (clk + 1));
}
clk |= variant->clkreg_enable;
clk |= MCI_CLK_ENABLE;
/* This hasn't proven to be worthwhile */
/* clk |= MCI_CLK_PWRSAVE; */
}
/* Set actual clock for debug */
host->mmc->actual_clock = host->cclk;
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
clk |= MCI_4BIT_BUS;
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
clk |= MCI_ST_8BIT_BUS;
if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)
clk |= MCI_ST_UX500_NEG_EDGE;
mmci_write_clkreg(host, clk);
}
static void
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
{
writel(0, host->base + MMCICOMMAND);
BUG_ON(host->data);
host->mrq = NULL;
host->cmd = NULL;
mmc_request_done(host->mmc, mrq);
pm_runtime_mark_last_busy(mmc_dev(host->mmc));
pm_runtime_put_autosuspend(mmc_dev(host->mmc));
}
static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
{
void __iomem *base = host->base;
if (host->singleirq) {
unsigned int mask0 = readl(base + MMCIMASK0);
mask0 &= ~MCI_IRQ1MASK;
mask0 |= mask;
writel(mask0, base + MMCIMASK0);
}
writel(mask, base + MMCIMASK1);
}
static void mmci_stop_data(struct mmci_host *host)
{
mmci_write_datactrlreg(host, 0);
mmci_set_mask1(host, 0);
host->data = NULL;
}
static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
{
unsigned int flags = SG_MITER_ATOMIC;
if (data->flags & MMC_DATA_READ)
flags |= SG_MITER_TO_SG;
else
flags |= SG_MITER_FROM_SG;
sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
}
/*
* All the DMA operation mode stuff goes inside this ifdef.
* This assumes that you have a generic DMA device interface,
* no custom DMA interfaces are supported.
*/
#ifdef CONFIG_DMA_ENGINE
static void mmci_dma_setup(struct mmci_host *host)
{
struct mmci_platform_data *plat = host->plat;
const char *rxname, *txname;
dma_cap_mask_t mask;
host->dma_rx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "rx");
host->dma_tx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "tx");
/* initialize pre request cookie */
host->next_data.cookie = 1;
/* Try to acquire a generic DMA engine slave channel */
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
if (plat && plat->dma_filter) {
if (!host->dma_rx_channel && plat->dma_rx_param) {
host->dma_rx_channel = dma_request_channel(mask,
plat->dma_filter,
plat->dma_rx_param);
/* E.g if no DMA hardware is present */
if (!host->dma_rx_channel)
dev_err(mmc_dev(host->mmc), "no RX DMA channel\n");
}
if (!host->dma_tx_channel && plat->dma_tx_param) {
host->dma_tx_channel = dma_request_channel(mask,
plat->dma_filter,
plat->dma_tx_param);
if (!host->dma_tx_channel)
dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n");
}
}
/*
* If only an RX channel is specified, the driver will
* attempt to use it bidirectionally, however if it is
* is specified but cannot be located, DMA will be disabled.
*/
if (host->dma_rx_channel && !host->dma_tx_channel)
host->dma_tx_channel = host->dma_rx_channel;
if (host->dma_rx_channel)
rxname = dma_chan_name(host->dma_rx_channel);
else
rxname = "none";
if (host->dma_tx_channel)
txname = dma_chan_name(host->dma_tx_channel);
else
txname = "none";
dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
rxname, txname);
/*
* Limit the maximum segment size in any SG entry according to
* the parameters of the DMA engine device.
*/
if (host->dma_tx_channel) {
struct device *dev = host->dma_tx_channel->device->dev;
unsigned int max_seg_size = dma_get_max_seg_size(dev);
if (max_seg_size < host->mmc->max_seg_size)
host->mmc->max_seg_size = max_seg_size;
}
if (host->dma_rx_channel) {
struct device *dev = host->dma_rx_channel->device->dev;
unsigned int max_seg_size = dma_get_max_seg_size(dev);
if (max_seg_size < host->mmc->max_seg_size)
host->mmc->max_seg_size = max_seg_size;
}
}
/*
* This is used in or so inline it
* so it can be discarded.
*/
static inline void mmci_dma_release(struct mmci_host *host)
{
struct mmci_platform_data *plat = host->plat;
if (host->dma_rx_channel)
dma_release_channel(host->dma_rx_channel);
if (host->dma_tx_channel && plat->dma_tx_param)
dma_release_channel(host->dma_tx_channel);
host->dma_rx_channel = host->dma_tx_channel = NULL;
}
static void mmci_dma_data_error(struct mmci_host *host)
{
dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
dmaengine_terminate_all(host->dma_current);
host->dma_current = NULL;
host->dma_desc_current = NULL;
host->data->host_cookie = 0;
}
static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
{
struct dma_chan *chan;
enum dma_data_direction dir;
if (data->flags & MMC_DATA_READ) {
dir = DMA_FROM_DEVICE;
chan = host->dma_rx_channel;
} else {
dir = DMA_TO_DEVICE;
chan = host->dma_tx_channel;
}
dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
}
static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
{
u32 status;
int i;
/* Wait up to 1ms for the DMA to complete */
for (i = 0; ; i++) {
status = readl(host->base + MMCISTATUS);
if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
break;
udelay(10);
}
/*
* Check to see whether we still have some data left in the FIFO -
* this catches DMA controllers which are unable to monitor the
* DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
* contiguous buffers. On TX, we'll get a FIFO underrun error.
*/
if (status & MCI_RXDATAAVLBLMASK) {
mmci_dma_data_error(host);
if (!data->error)
data->error = -EIO;
}
if (!data->host_cookie)
mmci_dma_unmap(host, data);
/*
* Use of DMA with scatter-gather is impossible.
* Give up with DMA and switch back to PIO mode.
*/
if (status & MCI_RXDATAAVLBLMASK) {
dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
mmci_dma_release(host);
}
host->dma_current = NULL;
host->dma_desc_current = NULL;
}
/* prepares DMA channel and DMA descriptor, returns non-zero on failure */
static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
struct dma_chan **dma_chan,
struct dma_async_tx_descriptor **dma_desc)
{
struct variant_data *variant = host->variant;
struct dma_slave_config conf = {
.src_addr = host->phybase + MMCIFIFO,
.dst_addr = host->phybase + MMCIFIFO,
.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.src_maxburst = variant->fifohalfsize >> 2, /* # of words */
.dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
.device_fc = false,
};
struct dma_chan *chan;
struct dma_device *device;
struct dma_async_tx_descriptor *desc;
enum dma_data_direction buffer_dirn;
int nr_sg;
if (data->flags & MMC_DATA_READ) {
conf.direction = DMA_DEV_TO_MEM;
buffer_dirn = DMA_FROM_DEVICE;
chan = host->dma_rx_channel;
} else {
conf.direction = DMA_MEM_TO_DEV;
buffer_dirn = DMA_TO_DEVICE;
chan = host->dma_tx_channel;
}
/* If there's no DMA channel, fall back to PIO */
if (!chan)
return -EINVAL;
/* If less than or equal to the fifo size, don't bother with DMA */
if (data->blksz * data->blocks <= variant->fifosize)
return -EINVAL;
device = chan->device;
nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len, buffer_dirn);
if (nr_sg == 0)
return -EINVAL;
dmaengine_slave_config(chan, &conf);
desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
conf.direction, DMA_CTRL_ACK);
if (!desc)
goto unmap_exit;
*dma_chan = chan;
*dma_desc = desc;
return 0;
unmap_exit:
dma_unmap_sg(device->dev, data->sg, data->sg_len, buffer_dirn);
return -ENOMEM;
}
static inline int mmci_dma_prep_data(struct mmci_host *host,
struct mmc_data *data)
{
/* Check if next job is already prepared. */
if (host->dma_current && host->dma_desc_current)
return 0;
/* No job were prepared thus do it now. */
return __mmci_dma_prep_data(host, data, &host->dma_current,
&host->dma_desc_current);
}
static inline int mmci_dma_prep_next(struct mmci_host *host,
struct mmc_data *data)
{
struct mmci_host_next *nd = &host->next_data;
return __mmci_dma_prep_data(host, data, &nd->dma_chan, &nd->dma_desc);
}
static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
{
int ret;
struct mmc_data *data = host->data;
ret = mmci_dma_prep_data(host, host->data);
if (ret)
return ret;
/* Okay, go for it. */
dev_vdbg(mmc_dev(host->mmc),
"Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
data->sg_len, data->blksz, data->blocks, data->flags);
dmaengine_submit(host->dma_desc_current);
dma_async_issue_pending(host->dma_current);
datactrl |= MCI_DPSM_DMAENABLE;
/* Trigger the DMA transfer */
mmci_write_datactrlreg(host, datactrl);
/*
* Let the MMCI say when the data is ended and it's time
* to fire next DMA request. When that happens, MMCI will
* call mmci_data_end()
*/
writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
host->base + MMCIMASK0);
return 0;
}
static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
{
struct mmci_host_next *next = &host->next_data;
WARN_ON(data->host_cookie && data->host_cookie != next->cookie);
WARN_ON(!data->host_cookie && (next->dma_desc || next->dma_chan));
host->dma_desc_current = next->dma_desc;
host->dma_current = next->dma_chan;
next->dma_desc = NULL;
next->dma_chan = NULL;
}
static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq,
bool is_first_req)
{
struct mmci_host *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
struct mmci_host_next *nd = &host->next_data;
if (!data)
return;
BUG_ON(data->host_cookie);
if (mmci_validate_data(host, data))
return;
if (!mmci_dma_prep_next(host, data))
data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie;
}
static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
int err)
{
struct mmci_host *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
if (!data || !data->host_cookie)
return;
mmci_dma_unmap(host, data);
if (err) {
struct mmci_host_next *next = &host->next_data;
struct dma_chan *chan;
if (data->flags & MMC_DATA_READ)
chan = host->dma_rx_channel;
else
chan = host->dma_tx_channel;
dmaengine_terminate_all(chan);
next->dma_desc = NULL;
next->dma_chan = NULL;
}
}
#else
/* Blank functions if the DMA engine is not available */
static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
{
}
static inline void mmci_dma_setup(struct mmci_host *host)
{
}
static inline void mmci_dma_release(struct mmci_host *host)
{
}
static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
{
}
static inline void mmci_dma_finalize(struct mmci_host *host,
struct mmc_data *data)
{
}
static inline void mmci_dma_data_error(struct mmci_host *host)
{
}
static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
{
return -ENOSYS;
}
#define mmci_pre_request NULL
#define mmci_post_request NULL
#endif
static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
{
struct variant_data *variant = host->variant;
unsigned int datactrl, timeout, irqmask;
unsigned long long clks;
void __iomem *base;
int blksz_bits;
dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n",
data->blksz, data->blocks, data->flags);
host->data = data;
host->size = data->blksz * data->blocks;
data->bytes_xfered = 0;
clks = (unsigned long long)data->timeout_ns * host->cclk;
do_div(clks, 1000000000UL);
timeout = data->timeout_clks + (unsigned int)clks;
base = host->base;
writel(timeout, base + MMCIDATATIMER);
writel(host->size, base + MMCIDATALENGTH);
blksz_bits = ffs(data->blksz) - 1;
BUG_ON(1 << blksz_bits != data->blksz);
if (variant->blksz_datactrl16)
datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
else
datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
if (data->flags & MMC_DATA_READ)
datactrl |= MCI_DPSM_DIRECTION;
/* The ST Micro variants has a special bit to enable SDIO */
if (variant->sdio && host->mmc->card)
if (mmc_card_sdio(host->mmc->card)) {
/*
* The ST Micro variants has a special bit
* to enable SDIO.
*/
u32 clk;
datactrl |= MCI_ST_DPSM_SDIOEN;
/*
* The ST Micro variant for SDIO small write transfers
* needs to have clock H/W flow control disabled,
* otherwise the transfer will not start. The threshold
* depends on the rate of MCLK.
*/
if (data->flags & MMC_DATA_WRITE &&
(host->size < 8 ||
(host->size <= 8 && host->mclk > 50000000)))
clk = host->clk_reg & ~variant->clkreg_enable;
else
clk = host->clk_reg | variant->clkreg_enable;
mmci_write_clkreg(host, clk);
}
if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)
datactrl |= MCI_ST_DPSM_DDRMODE;
/*
* Attempt to use DMA operation mode, if this
* should fail, fall back to PIO mode
*/
if (!mmci_dma_start_data(host, datactrl))
return;
/* IRQ mode, map the SG list for CPU reading/writing */
mmci_init_sg(host, data);
if (data->flags & MMC_DATA_READ) {
irqmask = MCI_RXFIFOHALFFULLMASK;
/*
* If we have less than the fifo 'half-full' threshold to
* transfer, trigger a PIO interrupt as soon as any data
* is available.
*/
if (host->size < variant->fifohalfsize)
irqmask |= MCI_RXDATAAVLBLMASK;
} else {
/*
* We don't actually need to include "FIFO empty" here
* since its implicit in "FIFO half empty".
*/
irqmask = MCI_TXFIFOHALFEMPTYMASK;
}
mmci_write_datactrlreg(host, datactrl);
writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
mmci_set_mask1(host, irqmask);
}
static void
mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
{
void __iomem *base = host->base;
dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
cmd->opcode, cmd->arg, cmd->flags);
if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
writel(0, base + MMCICOMMAND);
udelay(1);
}
c |= cmd->opcode | MCI_CPSM_ENABLE;
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136)
c |= MCI_CPSM_LONGRSP;
c |= MCI_CPSM_RESPONSE;
}
if (/*interrupt*/0)
c |= MCI_CPSM_INTERRUPT;
host->cmd = cmd;
writel(cmd->arg, base + MMCIARGUMENT);
writel(c, base + MMCICOMMAND);
}
static void
mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
unsigned int status)
{
/* First check for errors */
if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR|
MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
u32 remain, success;
/* Terminate the DMA transfer */
if (dma_inprogress(host)) {
mmci_dma_data_error(host);
mmci_dma_unmap(host, data);
}
/*
* Calculate how far we are into the transfer. Note that
* the data counter gives the number of bytes transferred
* on the MMC bus, not on the host side. On reads, this
* can be as much as a FIFO-worth of data ahead. This
* matters for FIFO overruns only.
*/
remain = readl(host->base + MMCIDATACNT);
success = data->blksz * data->blocks - remain;
dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
status, success);
if (status & MCI_DATACRCFAIL) {
/* Last block was not successful */
success -= 1;
data->error = -EILSEQ;
} else if (status & MCI_DATATIMEOUT) {
data->error = -ETIMEDOUT;
} else if (status & MCI_STARTBITERR) {
data->error = -ECOMM;
} else if (status & MCI_TXUNDERRUN) {
data->error = -EIO;
} else if (status & MCI_RXOVERRUN) {
if (success > host->variant->fifosize)
success -= host->variant->fifosize;
else
success = 0;
data->error = -EIO;
}
data->bytes_xfered = round_down(success, data->blksz);
}
if (status & MCI_DATABLOCKEND)
dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
if (status & MCI_DATAEND || data->error) {
if (dma_inprogress(host))
mmci_dma_finalize(host, data);
mmci_stop_data(host);
if (!data->error)
/* The error clause is handled above, success! */
data->bytes_xfered = data->blksz * data->blocks;
if (!data->stop || host->mrq->sbc) {
mmci_request_end(host, data->mrq);
} else {
mmci_start_command(host, data->stop, 0);
}
}
}
static void
mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
unsigned int status)
{
void __iomem *base = host->base;
bool sbc = (cmd == host->mrq->sbc);
bool busy_resp = host->variant->busy_detect &&
(cmd->flags & MMC_RSP_BUSY);
/* Check if we need to wait for busy completion. */
if (host->busy_status && (status & MCI_ST_CARDBUSY))
return;
/* Enable busy completion if needed and supported. */
if (!host->busy_status && busy_resp &&
!(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) &&
(readl(base + MMCISTATUS) & MCI_ST_CARDBUSY)) {
writel(readl(base + MMCIMASK0) | MCI_ST_BUSYEND,
base + MMCIMASK0);
host->busy_status = status & (MCI_CMDSENT|MCI_CMDRESPEND);
return;
}
/* At busy completion, mask the IRQ and complete the request. */
if (host->busy_status) {
writel(readl(base + MMCIMASK0) & ~MCI_ST_BUSYEND,
base + MMCIMASK0);
host->busy_status = 0;
}
host->cmd = NULL;
if (status & MCI_CMDTIMEOUT) {
cmd->error = -ETIMEDOUT;
} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
cmd->error = -EILSEQ;
} else {
cmd->resp[0] = readl(base + MMCIRESPONSE0);
cmd->resp[1] = readl(base + MMCIRESPONSE1);
cmd->resp[2] = readl(base + MMCIRESPONSE2);
cmd->resp[3] = readl(base + MMCIRESPONSE3);
}
if ((!sbc && !cmd->data) || cmd->error) {
if (host->data) {
/* Terminate the DMA transfer */
if (dma_inprogress(host)) {
mmci_dma_data_error(host);
mmci_dma_unmap(host, host->data);
}
mmci_stop_data(host);
}
mmci_request_end(host, host->mrq);
} else if (sbc) {
mmci_start_command(host, host->mrq->cmd, 0);
} else if (!(cmd->data->flags & MMC_DATA_READ)) {
mmci_start_data(host, cmd->data);
}
}
static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
{
void __iomem *base = host->base;
char *ptr = buffer;
u32 status;
int host_remain = host->size;
do {
int count = host_remain - (readl(base + MMCIFIFOCNT) << 2);
if (count > remain)
count = remain;
if (count <= 0)
break;
/*
* SDIO especially may want to send something that is
* not divisible by 4 (as opposed to card sectors
* etc). Therefore make sure to always read the last bytes
* while only doing full 32-bit reads towards the FIFO.
*/
if (unlikely(count & 0x3)) {
if (count < 4) {
unsigned char buf[4];
ioread32_rep(base + MMCIFIFO, buf, 1);
memcpy(ptr, buf, count);
} else {
ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
count &= ~0x3;
}
} else {
ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
}
ptr += count;
remain -= count;
host_remain -= count;
if (remain == 0)
break;
status = readl(base + MMCISTATUS);
} while (status & MCI_RXDATAAVLBL);
return ptr - buffer;
}
static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
{
struct variant_data *variant = host->variant;
void __iomem *base = host->base;
char *ptr = buffer;
do {
unsigned int count, maxcnt;
maxcnt = status & MCI_TXFIFOEMPTY ?
variant->fifosize : variant->fifohalfsize;
count = min(remain, maxcnt);
/*
* SDIO especially may want to send something that is
* not divisible by 4 (as opposed to card sectors
* etc), and the FIFO only accept full 32-bit writes.
* So compensate by adding +3 on the count, a single
* byte become a 32bit write, 7 bytes will be two
* 32bit writes etc.
*/
iowrite32_rep(base + MMCIFIFO, ptr, (count + 3) >> 2);
ptr += count;
remain -= count;
if (remain == 0)
break;
status = readl(base + MMCISTATUS);
} while (status & MCI_TXFIFOHALFEMPTY);
return ptr - buffer;
}
/*
* PIO data transfer IRQ handler.
*/
static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
{
struct mmci_host *host = dev_id;
struct sg_mapping_iter *sg_miter = &host->sg_miter;
struct variant_data *variant = host->variant;
void __iomem *base = host->base;
unsigned long flags;
u32 status;
status = readl(base + MMCISTATUS);
dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
local_irq_save(flags);
do {
unsigned int remain, len;
char *buffer;
/*
* For write, we only need to test the half-empty flag
* here - if the FIFO is completely empty, then by
* definition it is more than half empty.
*
* For read, check for data available.
*/
if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
break;
if (!sg_miter_next(sg_miter))
break;
buffer = sg_miter->addr;
remain = sg_miter->length;
len = 0;
if (status & MCI_RXACTIVE)
len = mmci_pio_read(host, buffer, remain);
if (status & MCI_TXACTIVE)
len = mmci_pio_write(host, buffer, remain, status);
sg_miter->consumed = len;
host->size -= len;
remain -= len;
if (remain)
break;
status = readl(base + MMCISTATUS);
} while (1);
sg_miter_stop(sg_miter);
local_irq_restore(flags);
/*
* If we have less than the fifo 'half-full' threshold to transfer,
* trigger a PIO interrupt as soon as any data is available.
*/
if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
/*
* If we run out of data, disable the data IRQs; this
* prevents a race where the FIFO becomes empty before
* the chip itself has disabled the data path, and
* stops us racing with our data end IRQ.
*/
if (host->size == 0) {
mmci_set_mask1(host, 0);
writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
}
return IRQ_HANDLED;
}
/*
* Handle completion of command and data transfers.
*/
static irqreturn_t mmci_irq(int irq, void *dev_id)
{
struct mmci_host *host = dev_id;
u32 status;
int ret = 0;
spin_lock(&host->lock);
do {
struct mmc_command *cmd;
struct mmc_data *data;
status = readl(host->base + MMCISTATUS);
if (host->singleirq) {
if (status & readl(host->base + MMCIMASK1))
mmci_pio_irq(irq, dev_id);
status &= ~MCI_IRQ1MASK;
}
/*
* We intentionally clear the MCI_ST_CARDBUSY IRQ here (if it's
* enabled) since the HW seems to be triggering the IRQ on both
* edges while monitoring DAT0 for busy completion.
*/
status &= readl(host->base + MMCIMASK0);
writel(status, host->base + MMCICLEAR);
dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status);
cmd = host->cmd;
if ((status|host->busy_status) & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|
MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
mmci_cmd_irq(host, cmd, status);
data = host->data;
if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR|
MCI_TXUNDERRUN|MCI_RXOVERRUN|MCI_DATAEND|
MCI_DATABLOCKEND) && data)
mmci_data_irq(host, data, status);
/* Don't poll for busy completion in irq context. */
if (host->busy_status)
status &= ~MCI_ST_CARDBUSY;
ret = 1;
} while (status);
spin_unlock(&host->lock);
return IRQ_RETVAL(ret);
}
static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct mmci_host *host = mmc_priv(mmc);
unsigned long flags;
WARN_ON(host->mrq != NULL);
mrq->cmd->error = mmci_validate_data(host, mrq->data);
if (mrq->cmd->error) {
mmc_request_done(mmc, mrq);
return;
}
pm_runtime_get_sync(mmc_dev(mmc));
spin_lock_irqsave(&host->lock, flags);
host->mrq = mrq;
if (mrq->data)
mmci_get_next_data(host, mrq->data);
if (mrq->data && mrq->data->flags & MMC_DATA_READ)
mmci_start_data(host, mrq->data);
if (mrq->sbc)
mmci_start_command(host, mrq->sbc, 0);
else
mmci_start_command(host, mrq->cmd, 0);
spin_unlock_irqrestore(&host->lock, flags);
}
static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmci_host *host = mmc_priv(mmc);
struct variant_data *variant = host->variant;
u32 pwr = 0;
unsigned long flags;
int ret;
pm_runtime_get_sync(mmc_dev(mmc));
if (host->plat->ios_handler &&
host->plat->ios_handler(mmc_dev(mmc), ios))
dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
switch (ios->power_mode) {
case MMC_POWER_OFF:
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
regulator_disable(mmc->supply.vqmmc);
host->vqmmc_enabled = false;
}
break;
case MMC_POWER_UP:
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
/*
* The ST Micro variant doesn't have the PL180s MCI_PWR_UP
* and instead uses MCI_PWR_ON so apply whatever value is
* configured in the variant data.
*/
pwr |= variant->pwrreg_powerup;
break;
case MMC_POWER_ON:
if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
ret = regulator_enable(mmc->supply.vqmmc);
if (ret < 0)
dev_err(mmc_dev(mmc),
"failed to enable vqmmc regulator\n");
else
host->vqmmc_enabled = true;
}
pwr |= MCI_PWR_ON;
break;
}
if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) {
/*
* The ST Micro variant has some additional bits
* indicating signal direction for the signals in
* the SD/MMC bus and feedback-clock usage.
*/
pwr |= host->plat->sigdir;
if (ios->bus_width == MMC_BUS_WIDTH_4)
pwr &= ~MCI_ST_DATA74DIREN;
else if (ios->bus_width == MMC_BUS_WIDTH_1)
pwr &= (~MCI_ST_DATA74DIREN &
~MCI_ST_DATA31DIREN &
~MCI_ST_DATA2DIREN);
}
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
if (host->hw_designer != AMBA_VENDOR_ST)
pwr |= MCI_ROD;
else {
/*
* The ST Micro variant use the ROD bit for something
* else and only has OD (Open Drain).
*/
pwr |= MCI_OD;
}
}
/*
* If clock = 0 and the variant requires the MMCIPOWER to be used for
* gating the clock, the MCI_PWR_ON bit is cleared.
*/
if (!ios->clock && variant->pwrreg_clkgate)
pwr &= ~MCI_PWR_ON;
spin_lock_irqsave(&host->lock, flags);
mmci_set_clkreg(host, ios->clock);
mmci_write_pwrreg(host, pwr);
mmci_reg_delay(host);
spin_unlock_irqrestore(&host->lock, flags);
pm_runtime_mark_last_busy(mmc_dev(mmc));
pm_runtime_put_autosuspend(mmc_dev(mmc));
}
static int mmci_get_ro(struct mmc_host *mmc)
{
struct mmci_host *host = mmc_priv(mmc);
if (host->gpio_wp == -ENOSYS)
return -ENOSYS;
return gpio_get_value_cansleep(host->gpio_wp);
}
static int mmci_get_cd(struct mmc_host *mmc)
{
struct mmci_host *host = mmc_priv(mmc);
struct mmci_platform_data *plat = host->plat;
unsigned int status;
if (host->gpio_cd == -ENOSYS) {
if (!plat->status)
return 1; /* Assume always present */
status = plat->status(mmc_dev(host->mmc));
} else
status = !!gpio_get_value_cansleep(host->gpio_cd)
^ plat->cd_invert;
/*
* Use positive logic throughout - status is zero for no card,
* non-zero for card inserted.
*/
return status;
}
static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
{
int ret = 0;
if (!IS_ERR(mmc->supply.vqmmc)) {
pm_runtime_get_sync(mmc_dev(mmc));
switch (ios->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_330:
ret = regulator_set_voltage(mmc->supply.vqmmc,
2700000, 3600000);
break;
case MMC_SIGNAL_VOLTAGE_180:
ret = regulator_set_voltage(mmc->supply.vqmmc,
1700000, 1950000);
break;
case MMC_SIGNAL_VOLTAGE_120:
ret = regulator_set_voltage(mmc->supply.vqmmc,
1100000, 1300000);
break;
}
if (ret)
dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
pm_runtime_mark_last_busy(mmc_dev(mmc));
pm_runtime_put_autosuspend(mmc_dev(mmc));
}
return ret;
}
static irqreturn_t mmci_cd_irq(int irq, void *dev_id)
{
struct mmci_host *host = dev_id;
mmc_detect_change(host->mmc, msecs_to_jiffies(500));
return IRQ_HANDLED;
}
static struct mmc_host_ops mmci_ops = {
.request = mmci_request,
.pre_req = mmci_pre_request,
.post_req = mmci_post_request,
.set_ios = mmci_set_ios,
.get_ro = mmci_get_ro,
.get_cd = mmci_get_cd,
.start_signal_voltage_switch = mmci_sig_volt_switch,
};
#ifdef CONFIG_OF
static void mmci_dt_populate_generic_pdata(struct device_node *np,
struct mmci_platform_data *pdata)
{
int bus_width = 0;
pdata->gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
pdata->gpio_cd = of_get_named_gpio(np, "cd-gpios", 0);
if (of_get_property(np, "cd-inverted", NULL))
pdata->cd_invert = true;
else
pdata->cd_invert = false;
of_property_read_u32(np, "max-frequency", &pdata->f_max);
if (!pdata->f_max)
pr_warn("%s has no 'max-frequency' property\n", np->full_name);
if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
pdata->capabilities |= MMC_CAP_MMC_HIGHSPEED;
if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
pdata->capabilities |= MMC_CAP_SD_HIGHSPEED;
of_property_read_u32(np, "bus-width", &bus_width);
switch (bus_width) {
case 0 :
/* No bus-width supplied. */
break;
case 4 :
pdata->capabilities |= MMC_CAP_4_BIT_DATA;
break;
case 8 :
pdata->capabilities |= MMC_CAP_8_BIT_DATA;
break;
default :
pr_warn("%s: Unsupported bus width\n", np->full_name);
}
}
#else
static void mmci_dt_populate_generic_pdata(struct device_node *np,
struct mmci_platform_data *pdata)
{
return;
}
#endif
static int mmci_probe(struct amba_device *dev,
const struct amba_id *id)
{
struct mmci_platform_data *plat = dev->dev.platform_data;
struct device_node *np = dev->dev.of_node;
struct variant_data *variant = id->data;
struct mmci_host *host;
struct mmc_host *mmc;
int ret;
/* Must have platform data or Device Tree. */
if (!plat && !np) {
dev_err(&dev->dev, "No plat data or DT found\n");
return -EINVAL;
}
if (!plat) {
plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL);
if (!plat)
return -ENOMEM;
}
if (np)
mmci_dt_populate_generic_pdata(np, plat);
ret = amba_request_regions(dev, DRIVER_NAME);
if (ret)
goto out;
mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
if (!mmc) {
ret = -ENOMEM;
goto rel_regions;
}
host = mmc_priv(mmc);
host->mmc = mmc;
host->gpio_wp = -ENOSYS;
host->gpio_cd = -ENOSYS;
host->gpio_cd_irq = -1;
host->hw_designer = amba_manf(dev);
host->hw_revision = amba_rev(dev);
dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer);
dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision);
host->clk = devm_clk_get(&dev->dev, NULL);
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
goto host_free;
}
ret = clk_prepare_enable(host->clk);
if (ret)
goto host_free;
host->plat = plat;
host->variant = variant;
host->mclk = clk_get_rate(host->clk);
/*
* According to the spec, mclk is max 100 MHz,
* so we try to adjust the clock down to this,
* (if possible).
*/
if (host->mclk > 100000000) {
ret = clk_set_rate(host->clk, 100000000);
if (ret < 0)
goto clk_disable;
host->mclk = clk_get_rate(host->clk);
dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
host->mclk);
}
host->phybase = dev->res.start;
host->base = ioremap(dev->res.start, resource_size(&dev->res));
if (!host->base) {
ret = -ENOMEM;
goto clk_disable;
}
/*
* The ARM and ST versions of the block have slightly different
* clock divider equations which means that the minimum divider
* differs too.
*/
if (variant->st_clkdiv)
mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
else
mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
/*
* If the platform data supplies a maximum operating
* frequency, this takes precedence. Else, we fall back
* to using the module parameter, which has a (low)
* default value in case it is not specified. Either
* value must not exceed the clock rate into the block,
* of course.
*/
if (plat->f_max)
mmc->f_max = min(host->mclk, plat->f_max);
else
mmc->f_max = min(host->mclk, fmax);
dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
/* Get regulators and the supported OCR mask */
mmc_regulator_get_supply(mmc);
if (!mmc->ocr_avail)
mmc->ocr_avail = plat->ocr_mask;
else if (plat->ocr_mask)
dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
mmc->caps = plat->capabilities;
mmc->caps2 = plat->capabilities2;
if (variant->busy_detect) {
mmci_ops.card_busy = mmci_card_busy;
mmci_write_datactrlreg(host, MCI_ST_DPSM_BUSYMODE);
mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
mmc->max_busy_timeout = 0;
}
mmc->ops = &mmci_ops;
/* We support these PM capabilities. */
mmc->pm_caps = MMC_PM_KEEP_POWER;
/*
* We can do SGIO
*/
mmc->max_segs = NR_SG;
/*
* Since only a certain number of bits are valid in the data length
* register, we must ensure that we don't exceed 2^num-1 bytes in a
* single request.
*/
mmc->max_req_size = (1 << variant->datalength_bits) - 1;
/*
* Set the maximum segment size. Since we aren't doing DMA
* (yet) we are only limited by the data length register.
*/
mmc->max_seg_size = mmc->max_req_size;
/*
* Block size can be up to 2048 bytes, but must be a power of two.
*/
mmc->max_blk_size = 1 << 11;
/*
* Limit the number of blocks transferred so that we don't overflow
* the maximum request size.
*/
mmc->max_blk_count = mmc->max_req_size >> 11;
spin_lock_init(&host->lock);
writel(0, host->base + MMCIMASK0);
writel(0, host->base + MMCIMASK1);
writel(0xfff, host->base + MMCICLEAR);
if (plat->gpio_cd == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto err_gpio_cd;
}
if (gpio_is_valid(plat->gpio_cd)) {
ret = gpio_request(plat->gpio_cd, DRIVER_NAME " (cd)");
if (ret == 0)
ret = gpio_direction_input(plat->gpio_cd);
if (ret == 0)
host->gpio_cd = plat->gpio_cd;
else if (ret != -ENOSYS)
goto err_gpio_cd;
/*
* A gpio pin that will detect cards when inserted and removed
* will most likely want to trigger on the edges if it is
* 0 when ejected and 1 when inserted (or mutatis mutandis
* for the inverted case) so we request triggers on both
* edges.
*/
ret = request_any_context_irq(gpio_to_irq(plat->gpio_cd),
mmci_cd_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
DRIVER_NAME " (cd)", host);
if (ret >= 0)
host->gpio_cd_irq = gpio_to_irq(plat->gpio_cd);
}
if (plat->gpio_wp == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto err_gpio_wp;
}
if (gpio_is_valid(plat->gpio_wp)) {
ret = gpio_request(plat->gpio_wp, DRIVER_NAME " (wp)");
if (ret == 0)
ret = gpio_direction_input(plat->gpio_wp);
if (ret == 0)
host->gpio_wp = plat->gpio_wp;
else if (ret != -ENOSYS)
goto err_gpio_wp;
}
if ((host->plat->status || host->gpio_cd != -ENOSYS)
&& host->gpio_cd_irq < 0)
mmc->caps |= MMC_CAP_NEEDS_POLL;
ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
if (ret)
goto unmap;
if (!dev->irq[1])
host->singleirq = true;
else {
ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED,
DRIVER_NAME " (pio)", host);
if (ret)
goto irq0_free;
}
writel(MCI_IRQENABLE, host->base + MMCIMASK0);
amba_set_drvdata(dev, mmc);
dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
amba_rev(dev), (unsigned long long)dev->res.start,
dev->irq[0], dev->irq[1]);
mmci_dma_setup(host);
pm_runtime_set_autosuspend_delay(&dev->dev, 50);
pm_runtime_use_autosuspend(&dev->dev);
pm_runtime_put(&dev->dev);
mmc_add_host(mmc);
return 0;
irq0_free:
free_irq(dev->irq[0], host);
unmap:
if (host->gpio_wp != -ENOSYS)
gpio_free(host->gpio_wp);
err_gpio_wp:
if (host->gpio_cd_irq >= 0)
free_irq(host->gpio_cd_irq, host);
if (host->gpio_cd != -ENOSYS)
gpio_free(host->gpio_cd);
err_gpio_cd:
iounmap(host->base);
clk_disable:
clk_disable_unprepare(host->clk);
host_free:
mmc_free_host(mmc);
rel_regions:
amba_release_regions(dev);
out:
return ret;
}
static int mmci_remove(struct amba_device *dev)
{
struct mmc_host *mmc = amba_get_drvdata(dev);
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
/*
* Undo pm_runtime_put() in probe. We use the _sync
* version here so that we can access the primecell.
*/
pm_runtime_get_sync(&dev->dev);
mmc_remove_host(mmc);
writel(0, host->base + MMCIMASK0);
writel(0, host->base + MMCIMASK1);
writel(0, host->base + MMCICOMMAND);
writel(0, host->base + MMCIDATACTRL);
mmci_dma_release(host);
free_irq(dev->irq[0], host);
if (!host->singleirq)
free_irq(dev->irq[1], host);
if (host->gpio_wp != -ENOSYS)
gpio_free(host->gpio_wp);
if (host->gpio_cd_irq >= 0)
free_irq(host->gpio_cd_irq, host);
if (host->gpio_cd != -ENOSYS)
gpio_free(host->gpio_cd);
iounmap(host->base);
clk_disable_unprepare(host->clk);
mmc_free_host(mmc);
amba_release_regions(dev);
}
return 0;
}
#ifdef CONFIG_SUSPEND
static int mmci_suspend(struct device *dev)
{
struct amba_device *adev = to_amba_device(dev);
struct mmc_host *mmc = amba_get_drvdata(adev);
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
pm_runtime_get_sync(dev);
writel(0, host->base + MMCIMASK0);
}
return 0;
}
static int mmci_resume(struct device *dev)
{
struct amba_device *adev = to_amba_device(dev);
struct mmc_host *mmc = amba_get_drvdata(adev);
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
writel(MCI_IRQENABLE, host->base + MMCIMASK0);
pm_runtime_put(dev);
}
return 0;
}
#endif
#ifdef CONFIG_PM_RUNTIME
static void mmci_save(struct mmci_host *host)
{
unsigned long flags;
if (host->variant->pwrreg_nopower) {
spin_lock_irqsave(&host->lock, flags);
writel(0, host->base + MMCIMASK0);
writel(0, host->base + MMCIDATACTRL);
writel(0, host->base + MMCIPOWER);
writel(0, host->base + MMCICLOCK);
mmci_reg_delay(host);
spin_unlock_irqrestore(&host->lock, flags);
}
}
static void mmci_restore(struct mmci_host *host)
{
unsigned long flags;
if (host->variant->pwrreg_nopower) {
spin_lock_irqsave(&host->lock, flags);
writel(host->clk_reg, host->base + MMCICLOCK);
writel(host->datactrl_reg, host->base + MMCIDATACTRL);
writel(host->pwr_reg, host->base + MMCIPOWER);
writel(MCI_IRQENABLE, host->base + MMCIMASK0);
mmci_reg_delay(host);
spin_unlock_irqrestore(&host->lock, flags);
}
}
static int mmci_runtime_suspend(struct device *dev)
{
struct amba_device *adev = to_amba_device(dev);
struct mmc_host *mmc = amba_get_drvdata(adev);
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
pinctrl_pm_select_sleep_state(dev);
mmci_save(host);
clk_disable_unprepare(host->clk);
}
return 0;
}
static int mmci_runtime_resume(struct device *dev)
{
struct amba_device *adev = to_amba_device(dev);
struct mmc_host *mmc = amba_get_drvdata(adev);
if (mmc) {
struct mmci_host *host = mmc_priv(mmc);
clk_prepare_enable(host->clk);
mmci_restore(host);
pinctrl_pm_select_default_state(dev);
}
return 0;
}
#endif
static const struct dev_pm_ops mmci_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mmci_suspend, mmci_resume)
SET_RUNTIME_PM_OPS(mmci_runtime_suspend, mmci_runtime_resume, NULL)
};
static struct amba_id mmci_ids[] = {
{
.id = 0x00041180,
.mask = 0xff0fffff,
.data = &variant_arm,
},
{
.id = 0x01041180,
.mask = 0xff0fffff,
.data = &variant_arm_extended_fifo,
},
{
.id = 0x02041180,
.mask = 0xff0fffff,
.data = &variant_arm_extended_fifo_hwfc,
},
{
.id = 0x00041181,
.mask = 0x000fffff,
.data = &variant_arm,
},
/* ST Micro variants */
{
.id = 0x00180180,
.mask = 0x00ffffff,
.data = &variant_u300,
},
{
.id = 0x10180180,
.mask = 0xf0ffffff,
.data = &variant_nomadik,
},
{
.id = 0x00280180,
.mask = 0x00ffffff,
.data = &variant_u300,
},
{
.id = 0x00480180,
.mask = 0xf0ffffff,
.data = &variant_ux500,
},
{
.id = 0x10480180,
.mask = 0xf0ffffff,
.data = &variant_ux500v2,
},
{ 0, 0 },
};
MODULE_DEVICE_TABLE(amba, mmci_ids);
static struct amba_driver mmci_driver = {
.drv = {
.name = DRIVER_NAME,
.pm = &mmci_dev_pm_ops,
},
.probe = mmci_probe,
.remove = mmci_remove,
.id_table = mmci_ids,
};
module_amba_driver(mmci_driver);
module_param(fmax, uint, 0444);
MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
MODULE_LICENSE("GPL");
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