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/* linux/drivers/mmc/host/sdhci-s3c.c
*
* Copyright 2008 Openmoko Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* SDHCI (HSMMC) support for Samsung SoC
*
* 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/spinlock.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/platform_data/mmc-sdhci-s3c.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/mmc/host.h>
#include "sdhci.h"
#define MAX_BUS_CLK (4)
#define S3C_SDHCI_CONTROL2 (0x80)
#define S3C_SDHCI_CONTROL3 (0x84)
#define S3C64XX_SDHCI_CONTROL4 (0x8C)
#define S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR BIT(31)
#define S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK BIT(30)
#define S3C_SDHCI_CTRL2_CDINVRXD3 BIT(29)
#define S3C_SDHCI_CTRL2_SLCARDOUT BIT(28)
#define S3C_SDHCI_CTRL2_FLTCLKSEL_MASK (0xf << 24)
#define S3C_SDHCI_CTRL2_FLTCLKSEL_SHIFT (24)
#define S3C_SDHCI_CTRL2_FLTCLKSEL(_x) ((_x) << 24)
#define S3C_SDHCI_CTRL2_LVLDAT_MASK (0xff << 16)
#define S3C_SDHCI_CTRL2_LVLDAT_SHIFT (16)
#define S3C_SDHCI_CTRL2_LVLDAT(_x) ((_x) << 16)
#define S3C_SDHCI_CTRL2_ENFBCLKTX BIT(15)
#define S3C_SDHCI_CTRL2_ENFBCLKRX BIT(14)
#define S3C_SDHCI_CTRL2_SDCDSEL BIT(13)
#define S3C_SDHCI_CTRL2_SDSIGPC BIT(12)
#define S3C_SDHCI_CTRL2_ENBUSYCHKTXSTART BIT(11)
#define S3C_SDHCI_CTRL2_DFCNT_MASK (0x3 << 9)
#define S3C_SDHCI_CTRL2_DFCNT_SHIFT (9)
#define S3C_SDHCI_CTRL2_DFCNT_NONE (0x0 << 9)
#define S3C_SDHCI_CTRL2_DFCNT_4SDCLK (0x1 << 9)
#define S3C_SDHCI_CTRL2_DFCNT_16SDCLK (0x2 << 9)
#define S3C_SDHCI_CTRL2_DFCNT_64SDCLK (0x3 << 9)
#define S3C_SDHCI_CTRL2_ENCLKOUTHOLD BIT(8)
#define S3C_SDHCI_CTRL2_RWAITMODE BIT(7)
#define S3C_SDHCI_CTRL2_DISBUFRD BIT(6)
#define S3C_SDHCI_CTRL2_SELBASECLK_MASK (0x3 << 4)
#define S3C_SDHCI_CTRL2_SELBASECLK_SHIFT (4)
#define S3C_SDHCI_CTRL2_PWRSYNC BIT(3)
#define S3C_SDHCI_CTRL2_ENCLKOUTMSKCON BIT(1)
#define S3C_SDHCI_CTRL2_HWINITFIN BIT(0)
#define S3C_SDHCI_CTRL3_FCSEL3 BIT(31)
#define S3C_SDHCI_CTRL3_FCSEL2 BIT(23)
#define S3C_SDHCI_CTRL3_FCSEL1 BIT(15)
#define S3C_SDHCI_CTRL3_FCSEL0 BIT(7)
#define S3C_SDHCI_CTRL3_FIA3_MASK (0x7f << 24)
#define S3C_SDHCI_CTRL3_FIA3_SHIFT (24)
#define S3C_SDHCI_CTRL3_FIA3(_x) ((_x) << 24)
#define S3C_SDHCI_CTRL3_FIA2_MASK (0x7f << 16)
#define S3C_SDHCI_CTRL3_FIA2_SHIFT (16)
#define S3C_SDHCI_CTRL3_FIA2(_x) ((_x) << 16)
#define S3C_SDHCI_CTRL3_FIA1_MASK (0x7f << 8)
#define S3C_SDHCI_CTRL3_FIA1_SHIFT (8)
#define S3C_SDHCI_CTRL3_FIA1(_x) ((_x) << 8)
#define S3C_SDHCI_CTRL3_FIA0_MASK (0x7f << 0)
#define S3C_SDHCI_CTRL3_FIA0_SHIFT (0)
#define S3C_SDHCI_CTRL3_FIA0(_x) ((_x) << 0)
#define S3C64XX_SDHCI_CONTROL4_DRIVE_MASK (0x3 << 16)
#define S3C64XX_SDHCI_CONTROL4_DRIVE_SHIFT (16)
#define S3C64XX_SDHCI_CONTROL4_DRIVE_2mA (0x0 << 16)
#define S3C64XX_SDHCI_CONTROL4_DRIVE_4mA (0x1 << 16)
#define S3C64XX_SDHCI_CONTROL4_DRIVE_7mA (0x2 << 16)
#define S3C64XX_SDHCI_CONTROL4_DRIVE_9mA (0x3 << 16)
#define S3C64XX_SDHCI_CONTROL4_BUSY (1)
/**
* struct sdhci_s3c - S3C SDHCI instance
* @host: The SDHCI host created
* @pdev: The platform device we where created from.
* @ioarea: The resource created when we claimed the IO area.
* @pdata: The platform data for this controller.
* @cur_clk: The index of the current bus clock.
* @clk_io: The clock for the internal bus interface.
* @clk_bus: The clocks that are available for the SD/MMC bus clock.
*/
struct sdhci_s3c {
struct sdhci_host *host;
struct platform_device *pdev;
struct resource *ioarea;
struct s3c_sdhci_platdata *pdata;
int cur_clk;
int ext_cd_irq;
int ext_cd_gpio;
struct clk *clk_io;
struct clk *clk_bus[MAX_BUS_CLK];
unsigned long clk_rates[MAX_BUS_CLK];
bool no_divider;
};
/**
* struct sdhci_s3c_driver_data - S3C SDHCI platform specific driver data
* @sdhci_quirks: sdhci host specific quirks.
*
* Specifies platform specific configuration of sdhci controller.
* Note: A structure for driver specific platform data is used for future
* expansion of its usage.
*/
struct sdhci_s3c_drv_data {
unsigned int sdhci_quirks;
bool no_divider;
};
static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
{
return sdhci_priv(host);
}
/**
* sdhci_s3c_get_max_clk - callback to get maximum clock frequency.
* @host: The SDHCI host instance.
*
* Callback to return the maximum clock rate acheivable by the controller.
*/
static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
{
struct sdhci_s3c *ourhost = to_s3c(host);
unsigned long rate, max = 0;
int src;
for (src = 0; src < MAX_BUS_CLK; src++) {
rate = ourhost->clk_rates[src];
if (rate > max)
max = rate;
}
return max;
}
/**
* sdhci_s3c_consider_clock - consider one the bus clocks for current setting
* @ourhost: Our SDHCI instance.
* @src: The source clock index.
* @wanted: The clock frequency wanted.
*/
static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
unsigned int src,
unsigned int wanted)
{
unsigned long rate;
struct clk *clksrc = ourhost->clk_bus[src];
int shift;
if (IS_ERR(clksrc))
return UINT_MAX;
/*
* If controller uses a non-standard clock division, find the best clock
* speed possible with selected clock source and skip the division.
*/
if (ourhost->no_divider) {
rate = clk_round_rate(clksrc, wanted);
return wanted - rate;
}
rate = ourhost->clk_rates[src];
for (shift = 0; shift <= 8; ++shift) {
if ((rate >> shift) <= wanted)
break;
}
if (shift > 8) {
dev_dbg(&ourhost->pdev->dev,
"clk %d: rate %ld, min rate %lu > wanted %u\n",
src, rate, rate / 256, wanted);
return UINT_MAX;
}
dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
src, rate, wanted, rate >> shift);
return wanted - (rate >> shift);
}
/**
* sdhci_s3c_set_clock - callback on clock change
* @host: The SDHCI host being changed
* @clock: The clock rate being requested.
*
* When the card's clock is going to be changed, look at the new frequency
* and find the best clock source to go with it.
*/
static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_s3c *ourhost = to_s3c(host);
unsigned int best = UINT_MAX;
unsigned int delta;
int best_src = 0;
int src;
u32 ctrl;
host->mmc->actual_clock = 0;
/* don't bother if the clock is going off. */
if (clock == 0) {
sdhci_set_clock(host, clock);
return;
}
for (src = 0; src < MAX_BUS_CLK; src++) {
delta = sdhci_s3c_consider_clock(ourhost, src, clock);
if (delta < best) {
best = delta;
best_src = src;
}
}
dev_dbg(&ourhost->pdev->dev,
"selected source %d, clock %d, delta %d\n",
best_src, clock, best);
/* select the new clock source */
if (ourhost->cur_clk != best_src) {
struct clk *clk = ourhost->clk_bus[best_src];
clk_prepare_enable(clk);
if (ourhost->cur_clk >= 0)
clk_disable_unprepare(
ourhost->clk_bus[ourhost->cur_clk]);
ourhost->cur_clk = best_src;
host->max_clk = ourhost->clk_rates[best_src];
}
/* turn clock off to card before changing clock source */
writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
ctrl |= best_src << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
/* reprogram default hardware configuration */
writel(S3C64XX_SDHCI_CONTROL4_DRIVE_9mA,
host->ioaddr + S3C64XX_SDHCI_CONTROL4);
ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
ctrl |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
S3C_SDHCI_CTRL2_ENFBCLKRX |
S3C_SDHCI_CTRL2_DFCNT_NONE |
S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
/* reconfigure the controller for new clock rate */
ctrl = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
if (clock < 25 * 1000000)
ctrl |= (S3C_SDHCI_CTRL3_FCSEL3 | S3C_SDHCI_CTRL3_FCSEL2);
writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL3);
sdhci_set_clock(host, clock);
}
/**
* sdhci_s3c_get_min_clock - callback to get minimal supported clock value
* @host: The SDHCI host being queried
*
* To init mmc host properly a minimal clock value is needed. For high system
* bus clock's values the standard formula gives values out of allowed range.
* The clock still can be set to lower values, if clock source other then
* system bus is selected.
*/
static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host)
{
struct sdhci_s3c *ourhost = to_s3c(host);
unsigned long rate, min = ULONG_MAX;
int src;
for (src = 0; src < MAX_BUS_CLK; src++) {
rate = ourhost->clk_rates[src] / 256;
if (!rate)
continue;
if (rate < min)
min = rate;
}
return min;
}
/* sdhci_cmu_get_max_clk - callback to get maximum clock frequency.*/
static unsigned int sdhci_cmu_get_max_clock(struct sdhci_host *host)
{
struct sdhci_s3c *ourhost = to_s3c(host);
unsigned long rate, max = 0;
int src;
for (src = 0; src < MAX_BUS_CLK; src++) {
struct clk *clk;
clk = ourhost->clk_bus[src];
if (IS_ERR(clk))
continue;
rate = clk_round_rate(clk, ULONG_MAX);
if (rate > max)
max = rate;
}
return max;
}
/* sdhci_cmu_get_min_clock - callback to get minimal supported clock value. */
static unsigned int sdhci_cmu_get_min_clock(struct sdhci_host *host)
{
struct sdhci_s3c *ourhost = to_s3c(host);
unsigned long rate, min = ULONG_MAX;
int src;
for (src = 0; src < MAX_BUS_CLK; src++) {
struct clk *clk;
clk = ourhost->clk_bus[src];
if (IS_ERR(clk))
continue;
rate = clk_round_rate(clk, 0);
if (rate < min)
min = rate;
}
return min;
}
/* sdhci_cmu_set_clock - callback on clock change.*/
static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_s3c *ourhost = to_s3c(host);
struct device *dev = &ourhost->pdev->dev;
unsigned long timeout;
u16 clk = 0;
int ret;
host->mmc->actual_clock = 0;
/* If the clock is going off, set to 0 at clock control register */
if (clock == 0) {
sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
return;
}
sdhci_s3c_set_clock(host, clock);
/* Reset SD Clock Enable */
clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
clk &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
if (ret != 0) {
dev_err(dev, "%s: failed to set clock rate %uHz\n",
mmc_hostname(host->mmc), clock);
return;
}
clk = SDHCI_CLOCK_INT_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
/* Wait max 20 ms */
timeout = 20;
while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
& SDHCI_CLOCK_INT_STABLE)) {
if (timeout == 0) {
dev_err(dev, "%s: Internal clock never stabilised.\n",
mmc_hostname(host->mmc));
return;
}
timeout--;
mdelay(1);
}
clk |= SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
}
static struct sdhci_ops sdhci_s3c_ops = {
.get_max_clock = sdhci_s3c_get_max_clk,
.set_clock = sdhci_s3c_set_clock,
.get_min_clock = sdhci_s3c_get_min_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
#ifdef CONFIG_OF
static int sdhci_s3c_parse_dt(struct device *dev,
struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
{
struct device_node *node = dev->of_node;
u32 max_width;
/* if the bus-width property is not specified, assume width as 1 */
if (of_property_read_u32(node, "bus-width", &max_width))
max_width = 1;
pdata->max_width = max_width;
/* get the card detection method */
if (of_get_property(node, "broken-cd", NULL)) {
pdata->cd_type = S3C_SDHCI_CD_NONE;
return 0;
}
if (of_get_property(node, "non-removable", NULL)) {
pdata->cd_type = S3C_SDHCI_CD_PERMANENT;
return 0;
}
if (of_get_named_gpio(node, "cd-gpios", 0))
return 0;
/* assuming internal card detect that will be configured by pinctrl */
pdata->cd_type = S3C_SDHCI_CD_INTERNAL;
return 0;
}
#else
static int sdhci_s3c_parse_dt(struct device *dev,
struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
{
return -EINVAL;
}
#endif
static const struct of_device_id sdhci_s3c_dt_match[];
static inline struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
struct platform_device *pdev)
{
#ifdef CONFIG_OF
if (pdev->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(sdhci_s3c_dt_match, pdev->dev.of_node);
return (struct sdhci_s3c_drv_data *)match->data;
}
#endif
return (struct sdhci_s3c_drv_data *)
platform_get_device_id(pdev)->driver_data;
}
static int sdhci_s3c_probe(struct platform_device *pdev)
{
struct s3c_sdhci_platdata *pdata;
struct sdhci_s3c_drv_data *drv_data;
struct device *dev = &pdev->dev;
struct sdhci_host *host;
struct sdhci_s3c *sc;
struct resource *res;
int ret, irq, ptr, clks;
if (!pdev->dev.platform_data && !pdev->dev.of_node) {
dev_err(dev, "no device data specified\n");
return -ENOENT;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "no irq specified\n");
return irq;
}
host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
if (IS_ERR(host)) {
dev_err(dev, "sdhci_alloc_host() failed\n");
return PTR_ERR(host);
}
sc = sdhci_priv(host);
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
ret = -ENOMEM;
goto err_pdata_io_clk;
}
if (pdev->dev.of_node) {
ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);
if (ret)
goto err_pdata_io_clk;
} else {
memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
sc->ext_cd_gpio = -1; /* invalid gpio number */
}
drv_data = sdhci_s3c_get_driver_data(pdev);
sc->host = host;
sc->pdev = pdev;
sc->pdata = pdata;
sc->cur_clk = -1;
platform_set_drvdata(pdev, host);
sc->clk_io = devm_clk_get(dev, "hsmmc");
if (IS_ERR(sc->clk_io)) {
dev_err(dev, "failed to get io clock\n");
ret = PTR_ERR(sc->clk_io);
goto err_pdata_io_clk;
}
/* enable the local io clock and keep it running for the moment. */
clk_prepare_enable(sc->clk_io);
for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
char name[14];
snprintf(name, 14, "mmc_busclk.%d", ptr);
sc->clk_bus[ptr] = devm_clk_get(dev, name);
if (IS_ERR(sc->clk_bus[ptr]))
continue;
clks++;
sc->clk_rates[ptr] = clk_get_rate(sc->clk_bus[ptr]);
dev_info(dev, "clock source %d: %s (%ld Hz)\n",
ptr, name, sc->clk_rates[ptr]);
}
if (clks == 0) {
dev_err(dev, "failed to find any bus clocks\n");
ret = -ENOENT;
goto err_no_busclks;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->ioaddr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->ioaddr)) {
ret = PTR_ERR(host->ioaddr);
goto err_req_regs;
}
/* Ensure we have minimal gpio selected CMD/CLK/Detect */
if (pdata->cfg_gpio)
pdata->cfg_gpio(pdev, pdata->max_width);
host->hw_name = "samsung-hsmmc";
host->ops = &sdhci_s3c_ops;
host->quirks = 0;
host->quirks2 = 0;
host->irq = irq;
/* Setup quirks for the controller */
host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
if (drv_data) {
host->quirks |= drv_data->sdhci_quirks;
sc->no_divider = drv_data->no_divider;
}
#ifndef CONFIG_MMC_SDHCI_S3C_DMA
/* we currently see overruns on errors, so disable the SDMA
* support as well. */
host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
#endif /* CONFIG_MMC_SDHCI_S3C_DMA */
/* It seems we do not get an DATA transfer complete on non-busy
* transfers, not sure if this is a problem with this specific
* SDHCI block, or a missing configuration that needs to be set. */
host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;
/* This host supports the Auto CMD12 */
host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
/* Samsung SoCs need BROKEN_ADMA_ZEROLEN_DESC */
host->quirks |= SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC;
if (pdata->cd_type == S3C_SDHCI_CD_NONE ||
pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
host->mmc->caps = MMC_CAP_NONREMOVABLE;
switch (pdata->max_width) {
case 8:
host->mmc->caps |= MMC_CAP_8_BIT_DATA;
case 4:
host->mmc->caps |= MMC_CAP_4_BIT_DATA;
break;
}
if (pdata->pm_caps)
host->mmc->pm_caps |= pdata->pm_caps;
host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
SDHCI_QUIRK_32BIT_DMA_SIZE);
/* HSMMC on Samsung SoCs uses SDCLK as timeout clock */
host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;
/*
* If controller does not have internal clock divider,
* we can use overriding functions instead of default.
*/
if (sc->no_divider) {
sdhci_s3c_ops.set_clock = sdhci_cmu_set_clock;
sdhci_s3c_ops.get_min_clock = sdhci_cmu_get_min_clock;
sdhci_s3c_ops.get_max_clock = sdhci_cmu_get_max_clock;
}
/* It supports additional host capabilities if needed */
if (pdata->host_caps)
host->mmc->caps |= pdata->host_caps;
if (pdata->host_caps2)
host->mmc->caps2 |= pdata->host_caps2;
pm_runtime_enable(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
pm_runtime_use_autosuspend(&pdev->dev);
pm_suspend_ignore_children(&pdev->dev, 1);
ret = mmc_of_parse(host->mmc);
if (ret)
goto err_req_regs;
ret = sdhci_add_host(host);
if (ret)
goto err_req_regs;
#ifdef CONFIG_PM
if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
clk_disable_unprepare(sc->clk_io);
#endif
return 0;
err_req_regs:
pm_runtime_disable(&pdev->dev);
err_no_busclks:
clk_disable_unprepare(sc->clk_io);
err_pdata_io_clk:
sdhci_free_host(host);
return ret;
}
static int sdhci_s3c_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_s3c *sc = sdhci_priv(host);
if (sc->ext_cd_irq)
free_irq(sc->ext_cd_irq, sc);
#ifdef CONFIG_PM
if (sc->pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
clk_prepare_enable(sc->clk_io);
#endif
sdhci_remove_host(host, 1);
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(sc->clk_io);
sdhci_free_host(host);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int sdhci_s3c_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
return sdhci_suspend_host(host);
}
static int sdhci_s3c_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
return sdhci_resume_host(host);
}
#endif
#ifdef CONFIG_PM
static int sdhci_s3c_runtime_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_s3c *ourhost = to_s3c(host);
struct clk *busclk = ourhost->clk_io;
int ret;
ret = sdhci_runtime_suspend_host(host);
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
if (ourhost->cur_clk >= 0)
clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);
clk_disable_unprepare(busclk);
return ret;
}
static int sdhci_s3c_runtime_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_s3c *ourhost = to_s3c(host);
struct clk *busclk = ourhost->clk_io;
int ret;
clk_prepare_enable(busclk);
if (ourhost->cur_clk >= 0)
clk_prepare_enable(ourhost->clk_bus[ourhost->cur_clk]);
ret = sdhci_runtime_resume_host(host);
return ret;
}
#endif
static const struct dev_pm_ops sdhci_s3c_pmops = {
SET_SYSTEM_SLEEP_PM_OPS(sdhci_s3c_suspend, sdhci_s3c_resume)
SET_RUNTIME_PM_OPS(sdhci_s3c_runtime_suspend, sdhci_s3c_runtime_resume,
NULL)
};
static const struct platform_device_id sdhci_s3c_driver_ids[] = {
{
.name = "s3c-sdhci",
.driver_data = (kernel_ulong_t)NULL,
},
{ }
};
MODULE_DEVICE_TABLE(platform, sdhci_s3c_driver_ids);
#ifdef CONFIG_OF
static struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
.no_divider = true,
};
static const struct of_device_id sdhci_s3c_dt_match[] = {
{ .compatible = "samsung,s3c6410-sdhci", },
{ .compatible = "samsung,exynos4210-sdhci",
.data = &exynos4_sdhci_drv_data },
{},
};
MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
#endif
static struct platform_driver sdhci_s3c_driver = {
.probe = sdhci_s3c_probe,
.remove = sdhci_s3c_remove,
.id_table = sdhci_s3c_driver_ids,
.driver = {
.name = "s3c-sdhci",
.of_match_table = of_match_ptr(sdhci_s3c_dt_match),
.pm = &sdhci_s3c_pmops,
},
};
module_platform_driver(sdhci_s3c_driver);
MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:s3c-sdhci");
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