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/*
* linux/drivers/mmc/host/sdhci_f_sdh30.c
*
* Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd
* Vincent Yang <vincent.yang@tw.fujitsu.com>
* Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org>
*
* 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, version 2 of the License.
*/
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/clk.h>
#include "sdhci-pltfm.h"
/* F_SDH30 extended Controller registers */
#define F_SDH30_AHB_CONFIG 0x100
#define F_SDH30_AHB_BIGED 0x00000040
#define F_SDH30_BUSLOCK_DMA 0x00000020
#define F_SDH30_BUSLOCK_EN 0x00000010
#define F_SDH30_SIN 0x00000008
#define F_SDH30_AHB_INCR_16 0x00000004
#define F_SDH30_AHB_INCR_8 0x00000002
#define F_SDH30_AHB_INCR_4 0x00000001
#define F_SDH30_TUNING_SETTING 0x108
#define F_SDH30_CMD_CHK_DIS 0x00010000
#define F_SDH30_IO_CONTROL2 0x114
#define F_SDH30_CRES_O_DN 0x00080000
#define F_SDH30_MSEL_O_1_8 0x00040000
#define F_SDH30_ESD_CONTROL 0x124
#define F_SDH30_EMMC_RST 0x00000002
#define F_SDH30_EMMC_HS200 0x01000000
#define F_SDH30_CMD_DAT_DELAY 0x200
#define F_SDH30_MIN_CLOCK 400000
struct f_sdhost_priv {
struct clk *clk_iface;
struct clk *clk;
u32 vendor_hs200;
struct device *dev;
bool enable_cmd_dat_delay;
};
static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host)
{
struct f_sdhost_priv *priv = sdhci_priv(host);
u32 ctrl = 0;
usleep_range(2500, 3000);
ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2);
ctrl |= F_SDH30_CRES_O_DN;
sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
ctrl |= F_SDH30_MSEL_O_1_8;
sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
ctrl &= ~F_SDH30_CRES_O_DN;
sdhci_writel(host, ctrl, F_SDH30_IO_CONTROL2);
usleep_range(2500, 3000);
if (priv->vendor_hs200) {
dev_info(priv->dev, "%s: setting hs200\n", __func__);
ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
ctrl |= priv->vendor_hs200;
sdhci_writel(host, ctrl, F_SDH30_ESD_CONTROL);
}
ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING);
ctrl |= F_SDH30_CMD_CHK_DIS;
sdhci_writel(host, ctrl, F_SDH30_TUNING_SETTING);
}
static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host)
{
return F_SDH30_MIN_CLOCK;
}
static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask)
{
struct f_sdhost_priv *priv = sdhci_priv(host);
u32 ctl;
if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0)
sdhci_writew(host, 0xBC01, SDHCI_CLOCK_CONTROL);
sdhci_reset(host, mask);
if (priv->enable_cmd_dat_delay) {
ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL);
ctl |= F_SDH30_CMD_DAT_DELAY;
sdhci_writel(host, ctl, F_SDH30_ESD_CONTROL);
}
}
static const struct sdhci_ops sdhci_f_sdh30_ops = {
.voltage_switch = sdhci_f_sdh30_soft_voltage_switch,
.get_min_clock = sdhci_f_sdh30_get_min_clock,
.reset = sdhci_f_sdh30_reset,
.set_clock = sdhci_set_clock,
.set_bus_width = sdhci_set_bus_width,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
static int sdhci_f_sdh30_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
struct device *dev = &pdev->dev;
struct resource *res;
int irq, ctrl = 0, ret = 0;
struct f_sdhost_priv *priv;
u32 reg = 0;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "%s: no irq specified\n", __func__);
return irq;
}
host = sdhci_alloc_host(dev, sizeof(struct f_sdhost_priv));
if (IS_ERR(host))
return PTR_ERR(host);
priv = sdhci_priv(host);
priv->dev = dev;
host->quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
host->quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
SDHCI_QUIRK2_TUNING_WORK_AROUND;
priv->enable_cmd_dat_delay = device_property_read_bool(dev,
"fujitsu,cmd-dat-delay-select");
ret = mmc_of_parse(host->mmc);
if (ret)
goto err;
platform_set_drvdata(pdev, host);
sdhci_get_of_property(pdev);
host->hw_name = "f_sdh30";
host->ops = &sdhci_f_sdh30_ops;
host->irq = irq;
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;
}
priv->clk_iface = devm_clk_get(&pdev->dev, "iface");
if (IS_ERR(priv->clk_iface)) {
ret = PTR_ERR(priv->clk_iface);
goto err;
}
ret = clk_prepare_enable(priv->clk_iface);
if (ret)
goto err;
priv->clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(priv->clk)) {
ret = PTR_ERR(priv->clk);
goto err_clk;
}
ret = clk_prepare_enable(priv->clk);
if (ret)
goto err_clk;
/* init vendor specific regs */
ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG);
ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 |
F_SDH30_AHB_INCR_4;
ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN);
sdhci_writew(host, ctrl, F_SDH30_AHB_CONFIG);
reg = sdhci_readl(host, F_SDH30_ESD_CONTROL);
sdhci_writel(host, reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
msleep(20);
sdhci_writel(host, reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL);
reg = sdhci_readl(host, SDHCI_CAPABILITIES);
if (reg & SDHCI_CAN_DO_8BIT)
priv->vendor_hs200 = F_SDH30_EMMC_HS200;
ret = sdhci_add_host(host);
if (ret)
goto err_add_host;
return 0;
err_add_host:
clk_disable_unprepare(priv->clk);
err_clk:
clk_disable_unprepare(priv->clk_iface);
err:
sdhci_free_host(host);
return ret;
}
static int sdhci_f_sdh30_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct f_sdhost_priv *priv = sdhci_priv(host);
sdhci_remove_host(host, readl(host->ioaddr + SDHCI_INT_STATUS) ==
0xffffffff);
clk_disable_unprepare(priv->clk_iface);
clk_disable_unprepare(priv->clk);
sdhci_free_host(host);
platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id f_sdh30_dt_ids[] = {
{ .compatible = "fujitsu,mb86s70-sdhci-3.0" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids);
static struct platform_driver sdhci_f_sdh30_driver = {
.driver = {
.name = "f_sdh30",
.of_match_table = f_sdh30_dt_ids,
.pm = &sdhci_pltfm_pmops,
},
.probe = sdhci_f_sdh30_probe,
.remove = sdhci_f_sdh30_remove,
};
module_platform_driver(sdhci_f_sdh30_driver);
MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD.");
MODULE_ALIAS("platform:f_sdh30");
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