Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-26 04:42:12 +00:00
Code Issues Packages Projects Releases Wiki Activity
20ea26a1e3
linux/drivers/mmc/host/sdhci-omap.c
Kishon Vijay Abraham I 20ea26a1e3 mmc: sdhci-omap: Add card_busy host ops 
Add card_busy host ops in sdhci_omap to check card busy status.

The voltage switching sequence for AM572x platform is mentioned
in Figure 25-48. eMMC/SD/SDIO Power Switching Procedure of
AM572x Sitara Processors Silicon Revision 2.0, 1.1 TRM
(SPRUHZ6I - October 2014–Revised April 2017 [1]).

In the voltage switching sequence, CLKEXTFREE bit in MMCHS_CON
should also be set after switching to 1.8v which is also taken
care in the card_busy ops.

[1] -> http://www.ti.com/lit/ug/spruhz6i/spruhz6i.pdf

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2018-03-05 09:00:56 +01:00

666 lines
16 KiB
C
Raw Blame History

/**
* SDHCI Controller driver for TI's OMAP SoCs
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
* the License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/delay.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include "sdhci-pltfm.h"
#define SDHCI_OMAP_CON 0x12c
#define CON_DW8 BIT(5)
#define CON_DMA_MASTER BIT(20)
#define CON_CLKEXTFREE BIT(16)
#define CON_PADEN BIT(15)
#define CON_INIT BIT(1)
#define CON_OD BIT(0)
#define SDHCI_OMAP_CMD 0x20c
#define SDHCI_OMAP_PSTATE 0x0224
#define PSTATE_DLEV_DAT0 BIT(20)
#define PSTATE_DATI BIT(1)
#define SDHCI_OMAP_HCTL 0x228
#define HCTL_SDBP BIT(8)
#define HCTL_SDVS_SHIFT 9
#define HCTL_SDVS_MASK (0x7 << HCTL_SDVS_SHIFT)
#define HCTL_SDVS_33 (0x7 << HCTL_SDVS_SHIFT)
#define HCTL_SDVS_30 (0x6 << HCTL_SDVS_SHIFT)
#define HCTL_SDVS_18 (0x5 << HCTL_SDVS_SHIFT)
#define SDHCI_OMAP_SYSCTL 0x22c
#define SYSCTL_CEN BIT(2)
#define SYSCTL_CLKD_SHIFT 6
#define SYSCTL_CLKD_MASK 0x3ff
#define SDHCI_OMAP_STAT 0x230
#define SDHCI_OMAP_IE 0x234
#define INT_CC_EN BIT(0)
#define SDHCI_OMAP_AC12 0x23c
#define AC12_V1V8_SIGEN BIT(19)
#define SDHCI_OMAP_CAPA 0x240
#define CAPA_VS33 BIT(24)
#define CAPA_VS30 BIT(25)
#define CAPA_VS18 BIT(26)
#define SDHCI_OMAP_TIMEOUT 1 /* 1 msec */
#define SYSCTL_CLKD_MAX 0x3FF
#define IOV_1V8 1800000 /* 180000 uV */
#define IOV_3V0 3000000 /* 300000 uV */
#define IOV_3V3 3300000 /* 330000 uV */
struct sdhci_omap_data {
u32 offset;
};
struct sdhci_omap_host {
void __iomem *base;
struct device *dev;
struct regulator *pbias;
bool pbias_enabled;
struct sdhci_host *host;
u8 bus_mode;
u8 power_mode;
};
static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
unsigned int offset)
{
return readl(host->base + offset);
}
static inline void sdhci_omap_writel(struct sdhci_omap_host *host,
unsigned int offset, u32 data)
{
writel(data, host->base + offset);
}
static int sdhci_omap_set_pbias(struct sdhci_omap_host *omap_host,
bool power_on, unsigned int iov)
{
int ret;
struct device *dev = omap_host->dev;
if (IS_ERR(omap_host->pbias))
return 0;
if (power_on) {
ret = regulator_set_voltage(omap_host->pbias, iov, iov);
if (ret) {
dev_err(dev, "pbias set voltage failed\n");
return ret;
}
if (omap_host->pbias_enabled)
return 0;
ret = regulator_enable(omap_host->pbias);
if (ret) {
dev_err(dev, "pbias reg enable fail\n");
return ret;
}
omap_host->pbias_enabled = true;
} else {
if (!omap_host->pbias_enabled)
return 0;
ret = regulator_disable(omap_host->pbias);
if (ret) {
dev_err(dev, "pbias reg disable fail\n");
return ret;
}
omap_host->pbias_enabled = false;
}
return 0;
}
static int sdhci_omap_enable_iov(struct sdhci_omap_host *omap_host,
unsigned int iov)
{
int ret;
struct sdhci_host *host = omap_host->host;
struct mmc_host *mmc = host->mmc;
ret = sdhci_omap_set_pbias(omap_host, false, 0);
if (ret)
return ret;
if (!IS_ERR(mmc->supply.vqmmc)) {
ret = regulator_set_voltage(mmc->supply.vqmmc, iov, iov);
if (ret) {
dev_err(mmc_dev(mmc), "vqmmc set voltage failed\n");
return ret;
}
}
ret = sdhci_omap_set_pbias(omap_host, true, iov);
if (ret)
return ret;
return 0;
}
static void sdhci_omap_conf_bus_power(struct sdhci_omap_host *omap_host,
unsigned char signal_voltage)
{
u32 reg;
ktime_t timeout;
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
reg &= ~HCTL_SDVS_MASK;
if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
reg |= HCTL_SDVS_33;
else
reg |= HCTL_SDVS_18;
sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
reg |= HCTL_SDBP;
sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, reg);
/* wait 1ms */
timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL) & HCTL_SDBP)) {
if (WARN_ON(ktime_after(ktime_get(), timeout)))
return;
usleep_range(5, 10);
}
}
static int sdhci_omap_card_busy(struct mmc_host *mmc)
{
u32 reg, ac12;
int ret = false;
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_omap_host *omap_host;
u32 ier = host->ier;
pltfm_host = sdhci_priv(host);
omap_host = sdhci_pltfm_priv(pltfm_host);
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
ac12 = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
reg &= ~CON_CLKEXTFREE;
if (ac12 & AC12_V1V8_SIGEN)
reg |= CON_CLKEXTFREE;
reg |= CON_PADEN;
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
disable_irq(host->irq);
ier |= SDHCI_INT_CARD_INT;
sdhci_writel(host, ier, SDHCI_INT_ENABLE);
sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
/*
* Delay is required for PSTATE to correctly reflect
* DLEV/CLEV values after PADEN is set.
*/
usleep_range(50, 100);
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_PSTATE);
if ((reg & PSTATE_DATI) || !(reg & PSTATE_DLEV_DAT0))
ret = true;
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
reg &= ~(CON_CLKEXTFREE | CON_PADEN);
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
enable_irq(host->irq);
return ret;
}
static int sdhci_omap_start_signal_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
u32 reg;
int ret;
unsigned int iov;
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_omap_host *omap_host;
struct device *dev;
pltfm_host = sdhci_priv(host);
omap_host = sdhci_pltfm_priv(pltfm_host);
dev = omap_host->dev;
if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
if (!(reg & CAPA_VS33))
return -EOPNOTSUPP;
sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
reg &= ~AC12_V1V8_SIGEN;
sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
iov = IOV_3V3;
} else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
if (!(reg & CAPA_VS18))
return -EOPNOTSUPP;
sdhci_omap_conf_bus_power(omap_host, ios->signal_voltage);
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_AC12);
reg |= AC12_V1V8_SIGEN;
sdhci_omap_writel(omap_host, SDHCI_OMAP_AC12, reg);
iov = IOV_1V8;
} else {
return -EOPNOTSUPP;
}
ret = sdhci_omap_enable_iov(omap_host, iov);
if (ret) {
dev_err(dev, "failed to switch IO voltage to %dmV\n", iov);
return ret;
}
dev_dbg(dev, "IO voltage switched to %dmV\n", iov);
return 0;
}
static void sdhci_omap_set_power_mode(struct sdhci_omap_host *omap_host,
u8 power_mode)
{
omap_host->power_mode = power_mode;
}
static void sdhci_omap_set_bus_mode(struct sdhci_omap_host *omap_host,
unsigned int mode)
{
u32 reg;
if (omap_host->bus_mode == mode)
return;
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
if (mode == MMC_BUSMODE_OPENDRAIN)
reg |= CON_OD;
else
reg &= ~CON_OD;
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
omap_host->bus_mode = mode;
}
static void sdhci_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_omap_host *omap_host;
pltfm_host = sdhci_priv(host);
omap_host = sdhci_pltfm_priv(pltfm_host);
sdhci_omap_set_bus_mode(omap_host, ios->bus_mode);
sdhci_set_ios(mmc, ios);
sdhci_omap_set_power_mode(omap_host, ios->power_mode);
}
static u16 sdhci_omap_calc_divisor(struct sdhci_pltfm_host *host,
unsigned int clock)
{
u16 dsor;
dsor = DIV_ROUND_UP(clk_get_rate(host->clk), clock);
if (dsor > SYSCTL_CLKD_MAX)
dsor = SYSCTL_CLKD_MAX;
return dsor;
}
static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host)
{
u32 reg;
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
reg |= SYSCTL_CEN;
sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
}
static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host)
{
u32 reg;
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
reg &= ~SYSCTL_CEN;
sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, reg);
}
static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
unsigned long clkdiv;
sdhci_omap_stop_clock(omap_host);
if (!clock)
return;
clkdiv = sdhci_omap_calc_divisor(pltfm_host, clock);
clkdiv = (clkdiv & SYSCTL_CLKD_MASK) << SYSCTL_CLKD_SHIFT;
sdhci_enable_clk(host, clkdiv);
sdhci_omap_start_clock(omap_host);
}
static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
unsigned short vdd)
{
struct mmc_host *mmc = host->mmc;
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
}
static int sdhci_omap_enable_dma(struct sdhci_host *host)
{
u32 reg;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
reg |= CON_DMA_MASTER;
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
return 0;
}
static unsigned int sdhci_omap_get_min_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return clk_get_rate(pltfm_host->clk) / SYSCTL_CLKD_MAX;
}
static void sdhci_omap_set_bus_width(struct sdhci_host *host, int width)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
u32 reg;
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
if (width == MMC_BUS_WIDTH_8)
reg |= CON_DW8;
else
reg &= ~CON_DW8;
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
sdhci_set_bus_width(host, width);
}
static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
{
u32 reg;
ktime_t timeout;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
if (omap_host->power_mode == power_mode)
return;
if (power_mode != MMC_POWER_ON)
return;
disable_irq(host->irq);
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
reg |= CON_INIT;
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
sdhci_omap_writel(omap_host, SDHCI_OMAP_CMD, 0x0);
/* wait 1ms */
timeout = ktime_add_ms(ktime_get(), SDHCI_OMAP_TIMEOUT);
while (!(sdhci_omap_readl(omap_host, SDHCI_OMAP_STAT) & INT_CC_EN)) {
if (WARN_ON(ktime_after(ktime_get(), timeout)))
return;
usleep_range(5, 10);
}
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
reg &= ~CON_INIT;
sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
sdhci_omap_writel(omap_host, SDHCI_OMAP_STAT, INT_CC_EN);
enable_irq(host->irq);
}
static struct sdhci_ops sdhci_omap_ops = {
.set_clock = sdhci_omap_set_clock,
.set_power = sdhci_omap_set_power,
.enable_dma = sdhci_omap_enable_dma,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.get_min_clock = sdhci_omap_get_min_clock,
.set_bus_width = sdhci_omap_set_bus_width,
.platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
{
u32 reg;
int ret = 0;
struct device *dev = omap_host->dev;
struct regulator *vqmmc;
vqmmc = regulator_get(dev, "vqmmc");
if (IS_ERR(vqmmc)) {
ret = PTR_ERR(vqmmc);
goto reg_put;
}
/* voltage capabilities might be set by boot loader, clear it */
reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
reg &= ~(CAPA_VS18 | CAPA_VS30 | CAPA_VS33);
if (regulator_is_supported_voltage(vqmmc, IOV_3V3, IOV_3V3))
reg |= CAPA_VS33;
if (regulator_is_supported_voltage(vqmmc, IOV_1V8, IOV_1V8))
reg |= CAPA_VS18;
sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, reg);
reg_put:
regulator_put(vqmmc);
return ret;
}
static const struct sdhci_pltfm_data sdhci_omap_pdata = {
.quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
SDHCI_QUIRK_NO_HISPD_BIT |
SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
.quirks2 = SDHCI_QUIRK2_NO_1_8_V |
SDHCI_QUIRK2_ACMD23_BROKEN |
SDHCI_QUIRK2_RSP_136_HAS_CRC,
.ops = &sdhci_omap_ops,
};
static const struct sdhci_omap_data dra7_data = {
.offset = 0x200,
};
static const struct of_device_id omap_sdhci_match[] = {
{ .compatible = "ti,dra7-sdhci", .data = &dra7_data },
{},
};
MODULE_DEVICE_TABLE(of, omap_sdhci_match);
static int sdhci_omap_probe(struct platform_device *pdev)
{
int ret;
u32 offset;
struct device *dev = &pdev->dev;
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_omap_host *omap_host;
struct mmc_host *mmc;
const struct of_device_id *match;
struct sdhci_omap_data *data;
match = of_match_device(omap_sdhci_match, dev);
if (!match)
return -EINVAL;
data = (struct sdhci_omap_data *)match->data;
if (!data) {
dev_err(dev, "no sdhci omap data\n");
return -EINVAL;
}
offset = data->offset;
host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
sizeof(*omap_host));
if (IS_ERR(host)) {
dev_err(dev, "Failed sdhci_pltfm_init\n");
return PTR_ERR(host);
}
pltfm_host = sdhci_priv(host);
omap_host = sdhci_pltfm_priv(pltfm_host);
omap_host->host = host;
omap_host->base = host->ioaddr;
omap_host->dev = dev;
omap_host->power_mode = MMC_POWER_UNDEFINED;
host->ioaddr += offset;
mmc = host->mmc;
ret = mmc_of_parse(mmc);
if (ret)
goto err_pltfm_free;
pltfm_host->clk = devm_clk_get(dev, "fck");
if (IS_ERR(pltfm_host->clk)) {
ret = PTR_ERR(pltfm_host->clk);
goto err_pltfm_free;
}
ret = clk_set_rate(pltfm_host->clk, mmc->f_max);
if (ret) {
dev_err(dev, "failed to set clock to %d\n", mmc->f_max);
goto err_pltfm_free;
}
omap_host->pbias = devm_regulator_get_optional(dev, "pbias");
if (IS_ERR(omap_host->pbias)) {
ret = PTR_ERR(omap_host->pbias);
if (ret != -ENODEV)
goto err_pltfm_free;
dev_dbg(dev, "unable to get pbias regulator %d\n", ret);
}
omap_host->pbias_enabled = false;
/*
* omap_device_pm_domain has callbacks to enable the main
* functional clock, interface clock and also configure the
* SYSCONFIG register of omap devices. The callback will be invoked
* as part of pm_runtime_get_sync.
*/
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
dev_err(dev, "pm_runtime_get_sync failed\n");
pm_runtime_put_noidle(dev);
goto err_rpm_disable;
}
ret = sdhci_omap_set_capabilities(omap_host);
if (ret) {
dev_err(dev, "failed to set system capabilities\n");
goto err_put_sync;
}
host->mmc_host_ops.get_ro = mmc_gpio_get_ro;
host->mmc_host_ops.start_signal_voltage_switch =
sdhci_omap_start_signal_voltage_switch;
host->mmc_host_ops.set_ios = sdhci_omap_set_ios;
host->mmc_host_ops.card_busy = sdhci_omap_card_busy;
sdhci_read_caps(host);
host->caps |= SDHCI_CAN_DO_ADMA2;
ret = sdhci_add_host(host);
if (ret)
goto err_put_sync;
return 0;
err_put_sync:
pm_runtime_put_sync(dev);
err_rpm_disable:
pm_runtime_disable(dev);
err_pltfm_free:
sdhci_pltfm_free(pdev);
return ret;
}
static int sdhci_omap_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sdhci_host *host = platform_get_drvdata(pdev);
sdhci_remove_host(host, true);
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
sdhci_pltfm_free(pdev);
return 0;
}
static struct platform_driver sdhci_omap_driver = {
.probe = sdhci_omap_probe,
.remove = sdhci_omap_remove,
.driver = {
.name = "sdhci-omap",
.of_match_table = omap_sdhci_match,
},
};
module_platform_driver(sdhci_omap_driver);
MODULE_DESCRIPTION("SDHCI driver for OMAP SoCs");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sdhci_omap");
Reference in New Issue View Git Blame Copy Permalink