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linux_old1/drivers/mmc/host/sdhci-esdhc-imx.c

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/*
* Freescale eSDHC i.MX controller driver for the platform bus.
*
* derived from the OF-version.
*
* Copyright (c) 2010 Pengutronix e.K.
* Author: Wolfram Sang <w.sang@pengutronix.de>
*
* 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.
*/
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_data/mmc-esdhc-imx.h>
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"
#define ESDHC_CTRL_D3CD 0x08
/* VENDOR SPEC register */
#define ESDHC_VENDOR_SPEC 0xc0
#define ESDHC_VENDOR_SPEC_SDIO_QUIRK (1 << 1)
#define ESDHC_WTMK_LVL 0x44
#define ESDHC_MIX_CTRL 0x48
#define ESDHC_MIX_CTRL_AC23EN (1 << 7)
/* Bits 3 and 6 are not SDHCI standard definitions */
#define ESDHC_MIX_CTRL_SDHCI_MASK 0xb7
/*
* Our interpretation of the SDHCI_HOST_CONTROL register
*/
#define ESDHC_CTRL_4BITBUS (0x1 << 1)
#define ESDHC_CTRL_8BITBUS (0x2 << 1)
#define ESDHC_CTRL_BUSWIDTH_MASK (0x3 << 1)
/*
* There is an INT DMA ERR mis-match between eSDHC and STD SDHC SPEC:
* Bit25 is used in STD SPEC, and is reserved in fsl eSDHC design,
* but bit28 is used as the INT DMA ERR in fsl eSDHC design.
* Define this macro DMA error INT for fsl eSDHC
*/
#define ESDHC_INT_VENDOR_SPEC_DMA_ERR (1 << 28)
/*
* The CMDTYPE of the CMD register (offset 0xE) should be set to
* "11" when the STOP CMD12 is issued on imx53 to abort one
* open ended multi-blk IO. Otherwise the TC INT wouldn't
* be generated.
* In exact block transfer, the controller doesn't complete the
* operations automatically as required at the end of the
* transfer and remains on hold if the abort command is not sent.
* As a result, the TC flag is not asserted and SW received timeout
* exeception. Bit1 of Vendor Spec registor is used to fix it.
*/
#define ESDHC_FLAG_MULTIBLK_NO_INT (1 << 1)
enum imx_esdhc_type {
IMX25_ESDHC,
IMX35_ESDHC,
IMX51_ESDHC,
IMX53_ESDHC,
IMX6Q_USDHC,
};
struct pltfm_imx_data {
int flags;
u32 scratchpad;
enum imx_esdhc_type devtype;
struct pinctrl *pinctrl;
struct esdhc_platform_data boarddata;
struct clk *clk_ipg;
struct clk *clk_ahb;
struct clk *clk_per;
};
static struct platform_device_id imx_esdhc_devtype[] = {
{
.name = "sdhci-esdhc-imx25",
.driver_data = IMX25_ESDHC,
}, {
.name = "sdhci-esdhc-imx35",
.driver_data = IMX35_ESDHC,
}, {
.name = "sdhci-esdhc-imx51",
.driver_data = IMX51_ESDHC,
}, {
.name = "sdhci-esdhc-imx53",
.driver_data = IMX53_ESDHC,
}, {
.name = "sdhci-usdhc-imx6q",
.driver_data = IMX6Q_USDHC,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, imx_esdhc_devtype);
static const struct of_device_id imx_esdhc_dt_ids[] = {
{ .compatible = "fsl,imx25-esdhc", .data = &imx_esdhc_devtype[IMX25_ESDHC], },
{ .compatible = "fsl,imx35-esdhc", .data = &imx_esdhc_devtype[IMX35_ESDHC], },
{ .compatible = "fsl,imx51-esdhc", .data = &imx_esdhc_devtype[IMX51_ESDHC], },
{ .compatible = "fsl,imx53-esdhc", .data = &imx_esdhc_devtype[IMX53_ESDHC], },
{ .compatible = "fsl,imx6q-usdhc", .data = &imx_esdhc_devtype[IMX6Q_USDHC], },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
static inline int is_imx25_esdhc(struct pltfm_imx_data *data)
{
return data->devtype == IMX25_ESDHC;
}
static inline int is_imx35_esdhc(struct pltfm_imx_data *data)
{
return data->devtype == IMX35_ESDHC;
}
static inline int is_imx51_esdhc(struct pltfm_imx_data *data)
{
return data->devtype == IMX51_ESDHC;
}
static inline int is_imx53_esdhc(struct pltfm_imx_data *data)
{
return data->devtype == IMX53_ESDHC;
}
static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
{
return data->devtype == IMX6Q_USDHC;
}
static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
{
void __iomem *base = host->ioaddr + (reg & ~0x3);
u32 shift = (reg & 0x3) * 8;
writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
}
static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
{
u32 val = readl(host->ioaddr + reg);
if (unlikely(reg == SDHCI_CAPABILITIES)) {
/* In FSL esdhc IC module, only bit20 is used to indicate the
* ADMA2 capability of esdhc, but this bit is messed up on
* some SOCs (e.g. on MX25, MX35 this bit is set, but they
* don't actually support ADMA2). So set the BROKEN_ADMA
* uirk on MX25/35 platforms.
*/
if (val & SDHCI_CAN_DO_ADMA1) {
val &= ~SDHCI_CAN_DO_ADMA1;
val |= SDHCI_CAN_DO_ADMA2;
}
}
if (unlikely(reg == SDHCI_INT_STATUS)) {
if (val & ESDHC_INT_VENDOR_SPEC_DMA_ERR) {
val &= ~ESDHC_INT_VENDOR_SPEC_DMA_ERR;
val |= SDHCI_INT_ADMA_ERROR;
}
}
return val;
}
static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
u32 data;
if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)) {
if (val & SDHCI_INT_CARD_INT) {
/*
* Clear and then set D3CD bit to avoid missing the
* card interrupt. This is a eSDHC controller problem
* so we need to apply the following workaround: clear
* and set D3CD bit will make eSDHC re-sample the card
* interrupt. In case a card interrupt was lost,
* re-sample it by the following steps.
*/
data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
data &= ~ESDHC_CTRL_D3CD;
writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
data |= ESDHC_CTRL_D3CD;
writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
}
}
if (unlikely((imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
&& (reg == SDHCI_INT_STATUS)
&& (val & SDHCI_INT_DATA_END))) {
u32 v;
v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
v &= ~ESDHC_VENDOR_SPEC_SDIO_QUIRK;
writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
}
if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE)) {
if (val & SDHCI_INT_ADMA_ERROR) {
val &= ~SDHCI_INT_ADMA_ERROR;
val |= ESDHC_INT_VENDOR_SPEC_DMA_ERR;
}
}
writel(val, host->ioaddr + reg);
}
static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
if (unlikely(reg == SDHCI_HOST_VERSION)) {
reg ^= 2;
if (is_imx6q_usdhc(imx_data)) {
/*
* The usdhc register returns a wrong host version.
* Correct it here.
*/
return SDHCI_SPEC_300;
}
}
return readw(host->ioaddr + reg);
}
static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
switch (reg) {
case SDHCI_TRANSFER_MODE:
if ((imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
&& (host->cmd->opcode == SD_IO_RW_EXTENDED)
&& (host->cmd->data->blocks > 1)
&& (host->cmd->data->flags & MMC_DATA_READ)) {
u32 v;
v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
v |= ESDHC_VENDOR_SPEC_SDIO_QUIRK;
writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
}
if (is_imx6q_usdhc(imx_data)) {
u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
/* Swap AC23 bit */
if (val & SDHCI_TRNS_AUTO_CMD23) {
val &= ~SDHCI_TRNS_AUTO_CMD23;
val |= ESDHC_MIX_CTRL_AC23EN;
}
m = val | (m & ~ESDHC_MIX_CTRL_SDHCI_MASK);
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
} else {
/*
* Postpone this write, we must do it together with a
* command write that is down below.
*/
imx_data->scratchpad = val;
}
return;
case SDHCI_COMMAND:
if ((host->cmd->opcode == MMC_STOP_TRANSMISSION ||
host->cmd->opcode == MMC_SET_BLOCK_COUNT) &&
(imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT))
val |= SDHCI_CMD_ABORTCMD;
if (is_imx6q_usdhc(imx_data))
writel(val << 16,
host->ioaddr + SDHCI_TRANSFER_MODE);
else
writel(val << 16 | imx_data->scratchpad,
host->ioaddr + SDHCI_TRANSFER_MODE);
return;
case SDHCI_BLOCK_SIZE:
val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
break;
}
esdhc_clrset_le(host, 0xffff, val, reg);
}
static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
u32 new_val;
u32 mask;
switch (reg) {
case SDHCI_POWER_CONTROL:
/*
* FSL put some DMA bits here
* If your board has a regulator, code should be here
*/
return;
case SDHCI_HOST_CONTROL:
/* FSL messed up here, so we need to manually compose it. */
new_val = val & SDHCI_CTRL_LED;
/* ensure the endianness */
new_val |= ESDHC_HOST_CONTROL_LE;
/* bits 8&9 are reserved on mx25 */
if (!is_imx25_esdhc(imx_data)) {
/* DMA mode bits are shifted */
new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
}
/*
* Do not touch buswidth bits here. This is done in
* esdhc_pltfm_bus_width.
*/
mask = 0xffff & ~ESDHC_CTRL_BUSWIDTH_MASK;
esdhc_clrset_le(host, mask, new_val, reg);
return;
}
esdhc_clrset_le(host, 0xff, val, reg);
/*
* The esdhc has a design violation to SDHC spec which tells
* that software reset should not affect card detection circuit.
* But esdhc clears its SYSCTL register bits [0..2] during the
* software reset. This will stop those clocks that card detection
* circuit relies on. To work around it, we turn the clocks on back
* to keep card detection circuit functional.
*/
if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1)) {
esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
/*
* The reset on usdhc fails to clear MIX_CTRL register.
* Do it manually here.
*/
if (is_imx6q_usdhc(imx_data))
writel(0, host->ioaddr + ESDHC_MIX_CTRL);
}
}
static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
return clk_get_rate(pltfm_host->clk) / 256 / 16;
}
static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
struct esdhc_platform_data *boarddata = &imx_data->boarddata;
switch (boarddata->wp_type) {
case ESDHC_WP_GPIO:
return mmc_gpio_get_ro(host->mmc);
case ESDHC_WP_CONTROLLER:
return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
SDHCI_WRITE_PROTECT);
case ESDHC_WP_NONE:
break;
}
return -ENOSYS;
}
static int esdhc_pltfm_bus_width(struct sdhci_host *host, int width)
{
u32 ctrl;
switch (width) {
case MMC_BUS_WIDTH_8:
ctrl = ESDHC_CTRL_8BITBUS;
break;
case MMC_BUS_WIDTH_4:
ctrl = ESDHC_CTRL_4BITBUS;
break;
default:
ctrl = 0;
break;
}
esdhc_clrset_le(host, ESDHC_CTRL_BUSWIDTH_MASK, ctrl,
SDHCI_HOST_CONTROL);
return 0;
}
static struct sdhci_ops sdhci_esdhc_ops = {
.read_l = esdhc_readl_le,
.read_w = esdhc_readw_le,
.write_l = esdhc_writel_le,
.write_w = esdhc_writew_le,
.write_b = esdhc_writeb_le,
.set_clock = esdhc_set_clock,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.get_min_clock = esdhc_pltfm_get_min_clock,
.get_ro = esdhc_pltfm_get_ro,
.platform_bus_width = esdhc_pltfm_bus_width,
};
static struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
.quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_HISPD_BIT
| SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
| SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC
| SDHCI_QUIRK_BROKEN_CARD_DETECTION,
.ops = &sdhci_esdhc_ops,
};
#ifdef CONFIG_OF
static int
sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
struct esdhc_platform_data *boarddata)
{
struct device_node *np = pdev->dev.of_node;
if (!np)
return -ENODEV;
if (of_get_property(np, "non-removable", NULL))
boarddata->cd_type = ESDHC_CD_PERMANENT;
if (of_get_property(np, "fsl,cd-controller", NULL))
boarddata->cd_type = ESDHC_CD_CONTROLLER;
if (of_get_property(np, "fsl,wp-controller", NULL))
boarddata->wp_type = ESDHC_WP_CONTROLLER;
boarddata->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
if (gpio_is_valid(boarddata->cd_gpio))
boarddata->cd_type = ESDHC_CD_GPIO;
boarddata->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
if (gpio_is_valid(boarddata->wp_gpio))
boarddata->wp_type = ESDHC_WP_GPIO;
of_property_read_u32(np, "bus-width", &boarddata->max_bus_width);
return 0;
}
#else
static inline int
sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
struct esdhc_platform_data *boarddata)
{
return -ENODEV;
}
#endif
static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(imx_esdhc_dt_ids, &pdev->dev);
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_host *host;
struct esdhc_platform_data *boarddata;
int err;
struct pltfm_imx_data *imx_data;
host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata);
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
imx_data = devm_kzalloc(&pdev->dev, sizeof(*imx_data), GFP_KERNEL);
if (!imx_data) {
err = -ENOMEM;
goto free_sdhci;
}
if (of_id)
pdev->id_entry = of_id->data;
imx_data->devtype = pdev->id_entry->driver_data;
pltfm_host->priv = imx_data;
imx_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(imx_data->clk_ipg)) {
err = PTR_ERR(imx_data->clk_ipg);
goto free_sdhci;
}
imx_data->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(imx_data->clk_ahb)) {
err = PTR_ERR(imx_data->clk_ahb);
goto free_sdhci;
}
imx_data->clk_per = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(imx_data->clk_per)) {
err = PTR_ERR(imx_data->clk_per);
goto free_sdhci;
}
pltfm_host->clk = imx_data->clk_per;
clk_prepare_enable(imx_data->clk_per);
clk_prepare_enable(imx_data->clk_ipg);
clk_prepare_enable(imx_data->clk_ahb);
imx_data->pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (IS_ERR(imx_data->pinctrl)) {
err = PTR_ERR(imx_data->pinctrl);
goto disable_clk;
}
host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
if (is_imx25_esdhc(imx_data) || is_imx35_esdhc(imx_data))
/* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */
host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK
| SDHCI_QUIRK_BROKEN_ADMA;
if (is_imx53_esdhc(imx_data))
imx_data->flags |= ESDHC_FLAG_MULTIBLK_NO_INT;
/*
* The imx6q ROM code will change the default watermark level setting
* to something insane. Change it back here.
*/
if (is_imx6q_usdhc(imx_data))
writel(0x08100810, host->ioaddr + ESDHC_WTMK_LVL);
boarddata = &imx_data->boarddata;
if (sdhci_esdhc_imx_probe_dt(pdev, boarddata) < 0) {
if (!host->mmc->parent->platform_data) {
dev_err(mmc_dev(host->mmc), "no board data!\n");
err = -EINVAL;
goto disable_clk;
}
imx_data->boarddata = *((struct esdhc_platform_data *)
host->mmc->parent->platform_data);
}
/* write_protect */
if (boarddata->wp_type == ESDHC_WP_GPIO) {
err = mmc_gpio_request_ro(host->mmc, boarddata->wp_gpio);
if (err) {
dev_err(mmc_dev(host->mmc),
"failed to request write-protect gpio!\n");
goto disable_clk;
}
host->mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
}
/* card_detect */
switch (boarddata->cd_type) {
case ESDHC_CD_GPIO:
err = mmc_gpio_request_cd(host->mmc, boarddata->cd_gpio);
if (err) {
dev_err(mmc_dev(host->mmc),
"failed to request card-detect gpio!\n");
goto disable_clk;
}
/* fall through */
case ESDHC_CD_CONTROLLER:
/* we have a working card_detect back */
host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
break;
case ESDHC_CD_PERMANENT:
host->mmc->caps = MMC_CAP_NONREMOVABLE;
break;
case ESDHC_CD_NONE:
break;
}
switch (boarddata->max_bus_width) {
case 8:
host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA;
break;
case 4:
host->mmc->caps |= MMC_CAP_4_BIT_DATA;
break;
case 1:
default:
host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
break;
}
err = sdhci_add_host(host);
if (err)
goto disable_clk;
return 0;
disable_clk:
clk_disable_unprepare(imx_data->clk_per);
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
free_sdhci:
sdhci_pltfm_free(pdev);
return err;
}
static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct pltfm_imx_data *imx_data = pltfm_host->priv;
int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
sdhci_remove_host(host, dead);
clk_disable_unprepare(imx_data->clk_per);
clk_disable_unprepare(imx_data->clk_ipg);
clk_disable_unprepare(imx_data->clk_ahb);
sdhci_pltfm_free(pdev);
return 0;
}
static struct platform_driver sdhci_esdhc_imx_driver = {
.driver = {
.name = "sdhci-esdhc-imx",
.owner = THIS_MODULE,
.of_match_table = imx_esdhc_dt_ids,
.pm = SDHCI_PLTFM_PMOPS,
},
.id_table = imx_esdhc_devtype,
.probe = sdhci_esdhc_imx_probe,
.remove = sdhci_esdhc_imx_remove,
};
module_platform_driver(sdhci_esdhc_imx_driver);
MODULE_DESCRIPTION("SDHCI driver for Freescale i.MX eSDHC");
MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
MODULE_LICENSE("GPL v2");
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