sdhci-spear: ST SPEAr based SDHCI controller glue

Add a glue layer to support the sdhci driver on the ST SPEAr platform.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Cc: <shiraz.hashim@st.com>
Cc: Linus Walleij <linus.ml.walleij@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Viresh KUMAR 2010-05-26 14:42:10 -07:00 committed by Linus Torvalds
parent 6c1f716e81
commit c63b3cba4f
5 changed files with 359 additions and 0 deletions

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@ -5004,6 +5004,12 @@ L: linux-mmc@vger.kernel.org
S: Maintained
F: drivers/mmc/host/sdhci-s3c.c
SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) ST SPEAR DRIVER
M: Viresh Kumar <viresh.kumar@st.com>
L: linux-mmc@vger.kernel.org
S: Maintained
F: drivers/mmc/host/sdhci-spear.c
SECURITY SUBSYSTEM
M: James Morris <jmorris@namei.org>
L: linux-security-module@vger.kernel.org (suggested Cc:)

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@ -136,6 +136,18 @@ config MMC_SDHCI_S3C
If unsure, say N.
config MMC_SDHCI_SPEAR
tristate "SDHCI support on ST SPEAr platform"
depends on MMC_SDHCI && PLAT_SPEAR
help
This selects the Secure Digital Host Controller Interface (SDHCI)
often referrered to as the HSMMC block in some of the ST SPEAR range
of SoC
If you have a controller with this interface, say Y or M here.
If unsure, say N.
config MMC_SDHCI_S3C_DMA
bool "DMA support on S3C SDHCI"
depends on MMC_SDHCI_S3C && EXPERIMENTAL

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@ -14,6 +14,7 @@ obj-$(CONFIG_MMC_SDHCI) += sdhci.o
obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o
obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-pltfm.o
obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
obj-$(CONFIG_MMC_OMAP) += omap.o

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@ -0,0 +1,298 @@
/*
* drivers/mmc/host/sdhci-spear.c
*
* Support of SDHCI platform devices for spear soc family
*
* Copyright (C) 2010 ST Microelectronics
* Viresh Kumar<viresh.kumar@st.com>
*
* Inspired by sdhci-pltfm.c
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sdhci-spear.h>
#include <linux/io.h>
#include "sdhci.h"
struct spear_sdhci {
struct clk *clk;
struct sdhci_plat_data *data;
};
/* sdhci ops */
static struct sdhci_ops sdhci_pltfm_ops = {
/* Nothing to do for now. */
};
/* gpio card detection interrupt handler */
static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct sdhci_host *host = platform_get_drvdata(pdev);
struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
unsigned long gpio_irq_type;
int val;
val = gpio_get_value(sdhci->data->card_int_gpio);
/* val == 1 -> card removed, val == 0 -> card inserted */
/* if card removed - set irq for low level, else vice versa */
gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
set_irq_type(irq, gpio_irq_type);
if (sdhci->data->card_power_gpio >= 0) {
if (!sdhci->data->power_always_enb) {
/* if card inserted, give power, otherwise remove it */
val = sdhci->data->power_active_high ? !val : val ;
gpio_set_value(sdhci->data->card_power_gpio, val);
}
}
/* inform sdhci driver about card insertion/removal */
tasklet_schedule(&host->card_tasklet);
return IRQ_HANDLED;
}
static int __devinit sdhci_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
struct resource *iomem;
struct spear_sdhci *sdhci;
int ret;
BUG_ON(pdev == NULL);
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iomem) {
ret = -ENOMEM;
dev_dbg(&pdev->dev, "memory resource not defined\n");
goto err;
}
if (!request_mem_region(iomem->start, resource_size(iomem),
"spear-sdhci")) {
ret = -EBUSY;
dev_dbg(&pdev->dev, "cannot request region\n");
goto err;
}
sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
if (!sdhci) {
ret = -ENOMEM;
dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
goto err_kzalloc;
}
/* clk enable */
sdhci->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(sdhci->clk)) {
ret = PTR_ERR(sdhci->clk);
dev_dbg(&pdev->dev, "Error getting clock\n");
goto err_clk_get;
}
ret = clk_enable(sdhci->clk);
if (ret) {
dev_dbg(&pdev->dev, "Error enabling clock\n");
goto err_clk_enb;
}
/* overwrite platform_data */
sdhci->data = dev_get_platdata(&pdev->dev);
pdev->dev.platform_data = sdhci;
if (pdev->dev.parent)
host = sdhci_alloc_host(pdev->dev.parent, 0);
else
host = sdhci_alloc_host(&pdev->dev, 0);
if (IS_ERR(host)) {
ret = PTR_ERR(host);
dev_dbg(&pdev->dev, "error allocating host\n");
goto err_alloc_host;
}
host->hw_name = "sdhci";
host->ops = &sdhci_pltfm_ops;
host->irq = platform_get_irq(pdev, 0);
host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
host->ioaddr = ioremap(iomem->start, resource_size(iomem));
if (!host->ioaddr) {
ret = -ENOMEM;
dev_dbg(&pdev->dev, "failed to remap registers\n");
goto err_ioremap;
}
ret = sdhci_add_host(host);
if (ret) {
dev_dbg(&pdev->dev, "error adding host\n");
goto err_add_host;
}
platform_set_drvdata(pdev, host);
/*
* It is optional to use GPIOs for sdhci Power control & sdhci card
* interrupt detection. If sdhci->data is NULL, then use original sdhci
* lines otherwise GPIO lines.
* If GPIO is selected for power control, then power should be disabled
* after card removal and should be enabled when card insertion
* interrupt occurs
*/
if (!sdhci->data)
return 0;
if (sdhci->data->card_power_gpio >= 0) {
int val = 0;
ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
if (ret < 0) {
dev_dbg(&pdev->dev, "gpio request fail: %d\n",
sdhci->data->card_power_gpio);
goto err_pgpio_request;
}
if (sdhci->data->power_always_enb)
val = sdhci->data->power_active_high;
else
val = !sdhci->data->power_active_high;
ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
if (ret) {
dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
sdhci->data->card_power_gpio);
goto err_pgpio_direction;
}
gpio_set_value(sdhci->data->card_power_gpio, 1);
}
if (sdhci->data->card_int_gpio >= 0) {
ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
if (ret < 0) {
dev_dbg(&pdev->dev, "gpio request fail: %d\n",
sdhci->data->card_int_gpio);
goto err_igpio_request;
}
ret = gpio_direction_input(sdhci->data->card_int_gpio);
if (ret) {
dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
sdhci->data->card_int_gpio);
goto err_igpio_direction;
}
ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio),
sdhci_gpio_irq, IRQF_TRIGGER_LOW,
mmc_hostname(host->mmc), pdev);
if (ret) {
dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
sdhci->data->card_int_gpio);
goto err_igpio_request_irq;
}
}
return 0;
err_igpio_request_irq:
err_igpio_direction:
if (sdhci->data->card_int_gpio >= 0)
gpio_free(sdhci->data->card_int_gpio);
err_igpio_request:
err_pgpio_direction:
if (sdhci->data->card_power_gpio >= 0)
gpio_free(sdhci->data->card_power_gpio);
err_pgpio_request:
platform_set_drvdata(pdev, NULL);
sdhci_remove_host(host, 1);
err_add_host:
iounmap(host->ioaddr);
err_ioremap:
sdhci_free_host(host);
err_alloc_host:
clk_disable(sdhci->clk);
err_clk_enb:
clk_put(sdhci->clk);
err_clk_get:
kfree(sdhci);
err_kzalloc:
release_mem_region(iomem->start, resource_size(iomem));
err:
dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
return ret;
}
static int __devexit sdhci_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
int dead;
u32 scratch;
if (sdhci->data) {
if (sdhci->data->card_int_gpio >= 0) {
free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev);
gpio_free(sdhci->data->card_int_gpio);
}
if (sdhci->data->card_power_gpio >= 0)
gpio_free(sdhci->data->card_power_gpio);
}
platform_set_drvdata(pdev, NULL);
dead = 0;
scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
if (scratch == (u32)-1)
dead = 1;
sdhci_remove_host(host, dead);
iounmap(host->ioaddr);
sdhci_free_host(host);
clk_disable(sdhci->clk);
clk_put(sdhci->clk);
kfree(sdhci);
if (iomem)
release_mem_region(iomem->start, resource_size(iomem));
return 0;
}
static struct platform_driver sdhci_driver = {
.driver = {
.name = "sdhci",
.owner = THIS_MODULE,
},
.probe = sdhci_probe,
.remove = __devexit_p(sdhci_remove),
};
static int __init sdhci_init(void)
{
return platform_driver_register(&sdhci_driver);
}
module_init(sdhci_init);
static void __exit sdhci_exit(void)
{
platform_driver_unregister(&sdhci_driver);
}
module_exit(sdhci_exit);
MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
MODULE_LICENSE("GPL v2");

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@ -0,0 +1,42 @@
/*
* include/linux/mmc/sdhci-spear.h
*
* SDHCI declarations specific to ST SPEAr platform
*
* Copyright (C) 2010 ST Microelectronics
* Viresh Kumar<viresh.kumar@st.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#ifndef MMC_SDHCI_SPEAR_H
#define MMC_SDHCI_SPEAR_H
#include <linux/platform_device.h>
/*
* struct sdhci_plat_data: spear sdhci platform data structure
*
* @card_power_gpio: gpio pin for enabling/disabling power to sdhci socket
* @power_active_high: if set, enable power to sdhci socket by setting
* card_power_gpio
* @power_always_enb: If set, then enable power on probe, otherwise enable only
* on card insertion and disable on card removal.
* card_int_gpio: gpio pin used for card detection
*/
struct sdhci_plat_data {
int card_power_gpio;
int power_active_high;
int power_always_enb;
int card_int_gpio;
};
/* This function is used to set platform_data field of pdev->dev */
static inline void
sdhci_set_plat_data(struct platform_device *pdev, struct sdhci_plat_data *data)
{
pdev->dev.platform_data = data;
}
#endif /* MMC_SDHCI_SPEAR_H */