/*
* Arasan Secure Digital Host Controller Interface.
* Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu>
* Copyright (c) 2012 Wind River Systems, Inc.
* Copyright (C) 2013 Pengutronix e.K.
* Copyright (C) 2013 Xilinx Inc.
*
* Based on sdhci-of-esdhc.c
*
* Copyright (c) 2007 Freescale Semiconductor, Inc.
* Copyright (c) 2009 MontaVista Software, Inc.
*
* Authors: Xiaobo Xie <X.Xie@freescale.com>
* Anton Vorontsov <avorontsov@ru.mvista.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*/
#include <linux/clk-provider.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include "sdhci-pltfm.h"
#include <linux/of.h>
#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
#define VENDOR_ENHANCED_STROBE BIT(0)
#define PHY_CLK_TOO_SLOW_HZ 400000
/*
* On some SoCs the syscon area has a feature where the upper 16-bits of
* each 32-bit register act as a write mask for the lower 16-bits. This allows
* atomic updates of the register without locking. This macro is used on SoCs
* that have that feature.
*/
#define HIWORD_UPDATE(val, mask, shift) \
((val) << (shift) | (mask) << ((shift) + 16))
/**
* struct sdhci_arasan_soc_ctl_field - Field used in sdhci_arasan_soc_ctl_map
*
* @reg: Offset within the syscon of the register containing this field
* @width: Number of bits for this field
* @shift: Bit offset within @reg of this field (or -1 if not avail)
*/
struct sdhci_arasan_soc_ctl_field {
u32 reg;
u16 width;
s16 shift;
};
/**
* struct sdhci_arasan_soc_ctl_map - Map in syscon to corecfg registers
*
* It's up to the licensee of the Arsan IP block to make these available
* somewhere if needed. Presumably these will be scattered somewhere that's
* accessible via the syscon API.
*
* @baseclkfreq: Where to find corecfg_baseclkfreq
* @clockmultiplier: Where to find corecfg_clockmultiplier
* @hiword_update: If true, use HIWORD_UPDATE to access the syscon
*/
struct sdhci_arasan_soc_ctl_map {
struct sdhci_arasan_soc_ctl_field baseclkfreq;
struct sdhci_arasan_soc_ctl_field clockmultiplier;
bool hiword_update;
};
/**
* struct sdhci_arasan_data
* @host: Pointer to the main SDHCI host structure.
* @clk_ahb: Pointer to the AHB clock
* @phy: Pointer to the generic phy
* @is_phy_on: True if the PHY is on; false if not.
* @sdcardclk_hw: Struct for the clock we might provide to a PHY.
* @sdcardclk: Pointer to normal 'struct clock' for sdcardclk_hw.
* @soc_ctl_base: Pointer to regmap for syscon for soc_ctl registers.
* @soc_ctl_map: Map to get offsets into soc_ctl registers.
*/
struct sdhci_arasan_data {
struct sdhci_host *host;
struct clk *clk_ahb;
struct phy *phy;
bool is_phy_on;
struct clk_hw sdcardclk_hw;
struct clk *sdcardclk;
struct regmap *soc_ctl_base;
const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
unsigned int quirks; /* Arasan deviations from spec */
/* Controller does not have CD wired and will not function normally without */
#define SDHCI_ARASAN_QUIRK_FORCE_CDTEST BIT(0)
};
static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = {
.baseclkfreq = { .reg = 0xf000, .width = 8, .shift = 8 },
.clockmultiplier = { .reg = 0xf02c, .width = 8, .shift = 0},
.hiword_update = true,
};
/**
* sdhci_arasan_syscon_write - Write to a field in soc_ctl registers
*
* This function allows writing to fields in sdhci_arasan_soc_ctl_map.
* Note that if a field is specified as not available (shift < 0) then
* this function will silently return an error code. It will be noisy
* and print errors for any other (unexpected) errors.
*
* @host: The sdhci_host
* @fld: The field to write to
* @val: The value to write
*/
static int sdhci_arasan_syscon_write(struct sdhci_host *host,
const struct sdhci_arasan_soc_ctl_field *fld,
u32 val)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
struct regmap *soc_ctl_base = sdhci_arasan->soc_ctl_base;
u32 reg = fld->reg;
u16 width = fld->width;
s16 shift = fld->shift;
int ret;
/*
* Silently return errors for shift < 0 so caller doesn't have
* to check for fields which are optional. For fields that
* are required then caller needs to do something special
* anyway.
*/
if (shift < 0)
return -EINVAL;
if (sdhci_arasan->soc_ctl_map->hiword_update)
ret = regmap_write(soc_ctl_base, reg,
HIWORD_UPDATE(val, GENMASK(width, 0),
shift));
else
ret = regmap_update_bits(soc_ctl_base, reg,
GENMASK(shift + width, shift),
val << shift);
/* Yell about (unexpected) regmap errors */
if (ret)
pr_warn("%s: Regmap write fail: %d\n",
mmc_hostname(host->mmc), ret);
return ret;
}
static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
bool ctrl_phy = false;
if (!IS_ERR(sdhci_arasan->phy)) {
if (!sdhci_arasan->is_phy_on && clock <= PHY_CLK_TOO_SLOW_HZ) {
/*
* If PHY off, set clock to max speed and power PHY on.
*
* Although PHY docs apparently suggest power cycling
* when changing the clock the PHY doesn't like to be
* powered on while at low speeds like those used in ID
* mode. Even worse is powering the PHY on while the
* clock is off.
*
* To workaround the PHY limitations, the best we can
* do is to power it on at a faster speed and then slam
* through low speeds without power cycling.
*/
sdhci_set_clock(host, host->max_clk);
phy_power_on(sdhci_arasan->phy);
sdhci_arasan->is_phy_on = true;
/*
* We'll now fall through to the below case with
* ctrl_phy = false (so we won't turn off/on). The
* sdhci_set_clock() will set the real clock.
*/
} else if (clock > PHY_CLK_TOO_SLOW_HZ) {
/*
* At higher clock speeds the PHY is fine being power
* cycled and docs say you _should_ power cycle when
* changing clock speeds.
*/
ctrl_phy = true;
}
}
if (ctrl_phy && sdhci_arasan->is_phy_on) {
phy_power_off(sdhci_arasan->phy);
sdhci_arasan->is_phy_on = false;
}
sdhci_set_clock(host, clock);
if (ctrl_phy) {
phy_power_on(sdhci_arasan->phy);
sdhci_arasan->is_phy_on = true;
}
}
static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
struct mmc_ios *ios)
{
u32 vendor;
struct sdhci_host *host = mmc_priv(mmc);
vendor = sdhci_readl(host, SDHCI_ARASAN_VENDOR_REGISTER);
if (ios->enhanced_strobe)
vendor |= VENDOR_ENHANCED_STROBE;
else
vendor &= ~VENDOR_ENHANCED_STROBE;
sdhci_writel(host, vendor, SDHCI_ARASAN_VENDOR_REGISTER);
}
static void sdhci_arasan_reset(struct sdhci_host *host, u8 mask)
{
u8 ctrl;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
sdhci_reset(host, mask);
if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_FORCE_CDTEST) {
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN;
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
}
}
static int sdhci_arasan_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
switch (ios->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_180:
/*
* Plese don't switch to 1V8 as arasan,5.1 doesn't
* actually refer to this setting to indicate the
* signal voltage and the state machine will be broken
* actually if we force to enable 1V8. That's something
* like broken quirk but we could work around here.
*/
return 0;
case MMC_SIGNAL_VOLTAGE_330:
case MMC_SIGNAL_VOLTAGE_120:
/* We don't support 3V3 and 1V2 */
break;
}
return -EINVAL;
}
static const struct sdhci_ops sdhci_arasan_ops = {
.set_clock = sdhci_arasan_set_clock,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_arasan_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
static const struct sdhci_pltfm_data sdhci_arasan_pdata = {
.ops = &sdhci_arasan_ops,
.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
};
#ifdef CONFIG_PM_SLEEP
/**
* sdhci_arasan_suspend - Suspend method for the driver
* @dev: Address of the device structure
* Returns 0 on success and error value on error
*
* Put the device in a low power state.
*/
static int sdhci_arasan_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
int ret;
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
mmc_retune_needed(host->mmc);
ret = sdhci_suspend_host(host);
if (ret)
return ret;
if (!IS_ERR(sdhci_arasan->phy) && sdhci_arasan->is_phy_on) {
ret = phy_power_off(sdhci_arasan->phy);
if (ret) {
dev_err(dev, "Cannot power off phy.\n");
sdhci_resume_host(host);
return ret;
}
sdhci_arasan->is_phy_on = false;
}
clk_disable(pltfm_host->clk);
clk_disable(sdhci_arasan->clk_ahb);
return 0;
}
/**
* sdhci_arasan_resume - Resume method for the driver
* @dev: Address of the device structure
* Returns 0 on success and error value on error
*
* Resume operation after suspend
*/
static int sdhci_arasan_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
int ret;
ret = clk_enable(sdhci_arasan->clk_ahb);
if (ret) {
dev_err(dev, "Cannot enable AHB clock.\n");
return ret;
}
ret = clk_enable(pltfm_host->clk);
if (ret) {
dev_err(dev, "Cannot enable SD clock.\n");
return ret;
}
if (!IS_ERR(sdhci_arasan->phy) && host->mmc->actual_clock) {
ret = phy_power_on(sdhci_arasan->phy);
if (ret) {
dev_err(dev, "Cannot power on phy.\n");
return ret;
}
sdhci_arasan->is_phy_on = true;
}
return sdhci_resume_host(host);
}
#endif /* ! CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend,
sdhci_arasan_resume);
static const struct of_device_id sdhci_arasan_of_match[] = {
/* SoC-specific compatible strings w/ soc_ctl_map */
{
.compatible = "rockchip,rk3399-sdhci-5.1",
.data = &rk3399_soc_ctl_map,
},
/* Generic compatible below here */
{ .compatible = "arasan,sdhci-8.9a" },
{ .compatible = "arasan,sdhci-5.1" },
{ .compatible = "arasan,sdhci-4.9a" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match);
/**
* sdhci_arasan_sdcardclk_recalc_rate - Return the card clock rate
*
* Return the current actual rate of the SD card clock. This can be used
* to communicate with out PHY.
*
* @hw: Pointer to the hardware clock structure.
* @parent_rate The parent rate (should be rate of clk_xin).
* Returns the card clock rate.
*/
static unsigned long sdhci_arasan_sdcardclk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct sdhci_arasan_data *sdhci_arasan =
container_of(hw, struct sdhci_arasan_data, sdcardclk_hw);
struct sdhci_host *host = sdhci_arasan->host;
return host->mmc->actual_clock;
}
static const struct clk_ops arasan_sdcardclk_ops = {
.recalc_rate = sdhci_arasan_sdcardclk_recalc_rate,
};
/**
* sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
*
* The corecfg_clockmultiplier is supposed to contain clock multiplier
* value of programmable clock generator.
*
* NOTES:
* - Many existing devices don't seem to do this and work fine. To keep
* compatibility for old hardware where the device tree doesn't provide a
* register map, this function is a noop if a soc_ctl_map hasn't been provided
* for this platform.
* - The value of corecfg_clockmultiplier should sync with that of corresponding
* value reading from sdhci_capability_register. So this function is called
* once at probe time and never called again.
*
* @host: The sdhci_host
*/
static void sdhci_arasan_update_clockmultiplier(struct sdhci_host *host,
u32 value)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
sdhci_arasan->soc_ctl_map;
/* Having a map is optional */
if (!soc_ctl_map)
return;
/* If we have a map, we expect to have a syscon */
if (!sdhci_arasan->soc_ctl_base) {
pr_warn("%s: Have regmap, but no soc-ctl-syscon\n",
mmc_hostname(host->mmc));
return;
}
sdhci_arasan_syscon_write(host, &soc_ctl_map->clockmultiplier, value);
}
/**
* sdhci_arasan_update_baseclkfreq - Set corecfg_baseclkfreq
*
* The corecfg_baseclkfreq is supposed to contain the MHz of clk_xin. This
* function can be used to make that happen.
*
* NOTES:
* - Many existing devices don't seem to do this and work fine. To keep
* compatibility for old hardware where the device tree doesn't provide a
* register map, this function is a noop if a soc_ctl_map hasn't been provided
* for this platform.
* - It's assumed that clk_xin is not dynamic and that we use the SDHCI divider
* to achieve lower clock rates. That means that this function is called once
* at probe time and never called again.
*
* @host: The sdhci_host
*/
static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
const struct sdhci_arasan_soc_ctl_map *soc_ctl_map =
sdhci_arasan->soc_ctl_map;
u32 mhz = DIV_ROUND_CLOSEST(clk_get_rate(pltfm_host->clk), 1000000);
/* Having a map is optional */
if (!soc_ctl_map)
return;
/* If we have a map, we expect to have a syscon */
if (!sdhci_arasan->soc_ctl_base) {
pr_warn("%s: Have regmap, but no soc-ctl-syscon\n",
mmc_hostname(host->mmc));
return;
}
sdhci_arasan_syscon_write(host, &soc_ctl_map->baseclkfreq, mhz);
}
/**
* sdhci_arasan_register_sdclk - Register the sdclk for a PHY to use
*
* Some PHY devices need to know what the actual card clock is. In order for
* them to find out, we'll provide a clock through the common clock framework
* for them to query.
*
* Note: without seriously re-architecting SDHCI's clock code and testing on
* all platforms, there's no way to create a totally beautiful clock here
* with all clock ops implemented. Instead, we'll just create a clock that can
* be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock
* framework that we're doing things behind its back. This should be sufficient
* to create nice clean device tree bindings and later (if needed) we can try
* re-architecting SDHCI if we see some benefit to it.
*
* @sdhci_arasan: Our private data structure.
* @clk_xin: Pointer to the functional clock
* @dev: Pointer to our struct device.
* Returns 0 on success and error value on error
*/
static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan,
struct clk *clk_xin,
struct device *dev)
{
struct device_node *np = dev->of_node;
struct clk_init_data sdcardclk_init;
const char *parent_clk_name;
int ret;
/* Providing a clock to the PHY is optional; no error if missing */
if (!of_find_property(np, "#clock-cells", NULL))
return 0;
ret = of_property_read_string_index(np, "clock-output-names", 0,
&sdcardclk_init.name);
if (ret) {
dev_err(dev, "DT has #clock-cells but no clock-output-names\n");
return ret;
}
parent_clk_name = __clk_get_name(clk_xin);
sdcardclk_init.parent_names = &parent_clk_name;
sdcardclk_init.num_parents = 1;
sdcardclk_init.flags = CLK_GET_RATE_NOCACHE;
sdcardclk_init.ops = &arasan_sdcardclk_ops;
sdhci_arasan->sdcardclk_hw.init = &sdcardclk_init;
sdhci_arasan->sdcardclk =
devm_clk_register(dev, &sdhci_arasan->sdcardclk_hw);
sdhci_arasan->sdcardclk_hw.init = NULL;
ret = of_clk_add_provider(np, of_clk_src_simple_get,
sdhci_arasan->sdcardclk);
if (ret)
dev_err(dev, "Failed to add clock provider\n");
return ret;
}
/**
* sdhci_arasan_unregister_sdclk - Undoes sdhci_arasan_register_sdclk()
*
* Should be called any time we're exiting and sdhci_arasan_register_sdclk()
* returned success.
*
* @dev: Pointer to our struct device.
*/
static void sdhci_arasan_unregister_sdclk(struct device *dev)
{
struct device_node *np = dev->of_node;
if (!of_find_property(np, "#clock-cells", NULL))
return;
of_clk_del_provider(dev->of_node);
}
static int sdhci_arasan_probe(struct platform_device *pdev)
{
int ret;
const struct of_device_id *match;
struct device_node *node;
struct clk *clk_xin;
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_arasan_data *sdhci_arasan;
struct device_node *np = pdev->dev.of_node;
host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata,
sizeof(*sdhci_arasan));
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
sdhci_arasan->host = host;
match = of_match_node(sdhci_arasan_of_match, pdev->dev.of_node);
sdhci_arasan->soc_ctl_map = match->data;
node = of_parse_phandle(pdev->dev.of_node, "arasan,soc-ctl-syscon", 0);
if (node) {
sdhci_arasan->soc_ctl_base = syscon_node_to_regmap(node);
of_node_put(node);
if (IS_ERR(sdhci_arasan->soc_ctl_base)) {
ret = PTR_ERR(sdhci_arasan->soc_ctl_base);
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "Can't get syscon: %d\n",
ret);
goto err_pltfm_free;
}
}
sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
if (IS_ERR(sdhci_arasan->clk_ahb)) {
dev_err(&pdev->dev, "clk_ahb clock not found.\n");
ret = PTR_ERR(sdhci_arasan->clk_ahb);
goto err_pltfm_free;
}
clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
if (IS_ERR(clk_xin)) {
dev_err(&pdev->dev, "clk_xin clock not found.\n");
ret = PTR_ERR(clk_xin);
goto err_pltfm_free;
}
ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
if (ret) {
dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
goto err_pltfm_free;
}
ret = clk_prepare_enable(clk_xin);
if (ret) {
dev_err(&pdev->dev, "Unable to enable SD clock.\n");
goto clk_dis_ahb;
}
sdhci_get_of_property(pdev);
if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST;
pltfm_host->clk = clk_xin;
if (of_device_is_compatible(pdev->dev.of_node,
"rockchip,rk3399-sdhci-5.1"))
sdhci_arasan_update_clockmultiplier(host, 0x0);
sdhci_arasan_update_baseclkfreq(host);
ret = sdhci_arasan_register_sdclk(sdhci_arasan, clk_xin, &pdev->dev);
if (ret)
goto clk_disable_all;
ret = mmc_of_parse(host->mmc);
if (ret) {
dev_err(&pdev->dev, "parsing dt failed (%d)\n", ret);
goto unreg_clk;
}
sdhci_arasan->phy = ERR_PTR(-ENODEV);
if (of_device_is_compatible(pdev->dev.of_node,
"arasan,sdhci-5.1")) {
sdhci_arasan->phy = devm_phy_get(&pdev->dev,
"phy_arasan");
if (IS_ERR(sdhci_arasan->phy)) {
ret = PTR_ERR(sdhci_arasan->phy);
dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
goto unreg_clk;
}
ret = phy_init(sdhci_arasan->phy);
if (ret < 0) {
dev_err(&pdev->dev, "phy_init err.\n");
goto unreg_clk;
}
host->mmc_host_ops.hs400_enhanced_strobe =
sdhci_arasan_hs400_enhanced_strobe;
host->mmc_host_ops.start_signal_voltage_switch =
sdhci_arasan_voltage_switch;
}
ret = sdhci_add_host(host);
if (ret)
goto err_add_host;
return 0;
err_add_host:
if (!IS_ERR(sdhci_arasan->phy))
phy_exit(sdhci_arasan->phy);
unreg_clk:
sdhci_arasan_unregister_sdclk(&pdev->dev);
clk_disable_all:
clk_disable_unprepare(clk_xin);
clk_dis_ahb:
clk_disable_unprepare(sdhci_arasan->clk_ahb);
err_pltfm_free:
sdhci_pltfm_free(pdev);
return ret;
}
static int sdhci_arasan_remove(struct platform_device *pdev)
{
int ret;
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
struct clk *clk_ahb = sdhci_arasan->clk_ahb;
if (!IS_ERR(sdhci_arasan->phy)) {
if (sdhci_arasan->is_phy_on)
phy_power_off(sdhci_arasan->phy);
phy_exit(sdhci_arasan->phy);
}
sdhci_arasan_unregister_sdclk(&pdev->dev);
ret = sdhci_pltfm_unregister(pdev);
clk_disable_unprepare(clk_ahb);
return ret;
}
static struct platform_driver sdhci_arasan_driver = {
.driver = {
.name = "sdhci-arasan",
.of_match_table = sdhci_arasan_of_match,
.pm = &sdhci_arasan_dev_pm_ops,
},
.probe = sdhci_arasan_probe,
.remove = sdhci_arasan_remove,
};
module_platform_driver(sdhci_arasan_driver);
MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller");
MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>");
MODULE_LICENSE("GPL");
