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
Linus Torvalds
parent
6c1f716e81
commit
c63b3cba4f
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@ -5004,6 +5004,12 @@ L: linux-mmc@vger.kernel.org
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S: Maintained
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F: drivers/mmc/host/sdhci-s3c.c
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SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) ST SPEAR DRIVER
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M: Viresh Kumar <viresh.kumar@st.com>
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L: linux-mmc@vger.kernel.org
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S: Maintained
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F: drivers/mmc/host/sdhci-spear.c
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SECURITY SUBSYSTEM
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M: James Morris <jmorris@namei.org>
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L: linux-security-module@vger.kernel.org (suggested Cc:)
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@ -136,6 +136,18 @@ config MMC_SDHCI_S3C
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If unsure, say N.
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config MMC_SDHCI_SPEAR
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tristate "SDHCI support on ST SPEAr platform"
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depends on MMC_SDHCI && PLAT_SPEAR
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help
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This selects the Secure Digital Host Controller Interface (SDHCI)
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often referrered to as the HSMMC block in some of the ST SPEAR range
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of SoC
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If you have a controller with this interface, say Y or M here.
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If unsure, say N.
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config MMC_SDHCI_S3C_DMA
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bool "DMA support on S3C SDHCI"
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depends on MMC_SDHCI_S3C && EXPERIMENTAL
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@ -14,6 +14,7 @@ obj-$(CONFIG_MMC_SDHCI) += sdhci.o
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obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o
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obj-$(CONFIG_MMC_SDHCI_PLTFM) += sdhci-pltfm.o
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obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
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obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
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obj-$(CONFIG_MMC_WBSD) += wbsd.o
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obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
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obj-$(CONFIG_MMC_OMAP) += omap.o
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@ -0,0 +1,298 @@
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/*
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* drivers/mmc/host/sdhci-spear.c
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*
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* Support of SDHCI platform devices for spear soc family
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*
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* Copyright (C) 2010 ST Microelectronics
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* Viresh Kumar<viresh.kumar@st.com>
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*
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* Inspired by sdhci-pltfm.c
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/highmem.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/sdhci-spear.h>
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#include <linux/io.h>
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#include "sdhci.h"
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struct spear_sdhci {
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struct clk *clk;
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struct sdhci_plat_data *data;
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};
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/* sdhci ops */
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static struct sdhci_ops sdhci_pltfm_ops = {
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/* Nothing to do for now. */
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};
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/* gpio card detection interrupt handler */
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static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
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unsigned long gpio_irq_type;
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int val;
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val = gpio_get_value(sdhci->data->card_int_gpio);
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/* val == 1 -> card removed, val == 0 -> card inserted */
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/* if card removed - set irq for low level, else vice versa */
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gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH;
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set_irq_type(irq, gpio_irq_type);
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if (sdhci->data->card_power_gpio >= 0) {
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if (!sdhci->data->power_always_enb) {
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/* if card inserted, give power, otherwise remove it */
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val = sdhci->data->power_active_high ? !val : val ;
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gpio_set_value(sdhci->data->card_power_gpio, val);
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}
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}
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/* inform sdhci driver about card insertion/removal */
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tasklet_schedule(&host->card_tasklet);
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return IRQ_HANDLED;
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}
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static int __devinit sdhci_probe(struct platform_device *pdev)
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{
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struct sdhci_host *host;
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struct resource *iomem;
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struct spear_sdhci *sdhci;
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int ret;
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BUG_ON(pdev == NULL);
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!iomem) {
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ret = -ENOMEM;
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dev_dbg(&pdev->dev, "memory resource not defined\n");
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goto err;
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}
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if (!request_mem_region(iomem->start, resource_size(iomem),
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"spear-sdhci")) {
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ret = -EBUSY;
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dev_dbg(&pdev->dev, "cannot request region\n");
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goto err;
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}
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sdhci = kzalloc(sizeof(*sdhci), GFP_KERNEL);
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if (!sdhci) {
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ret = -ENOMEM;
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dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
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goto err_kzalloc;
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}
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/* clk enable */
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sdhci->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(sdhci->clk)) {
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ret = PTR_ERR(sdhci->clk);
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dev_dbg(&pdev->dev, "Error getting clock\n");
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goto err_clk_get;
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}
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ret = clk_enable(sdhci->clk);
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if (ret) {
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dev_dbg(&pdev->dev, "Error enabling clock\n");
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goto err_clk_enb;
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}
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/* overwrite platform_data */
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sdhci->data = dev_get_platdata(&pdev->dev);
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pdev->dev.platform_data = sdhci;
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if (pdev->dev.parent)
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host = sdhci_alloc_host(pdev->dev.parent, 0);
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else
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host = sdhci_alloc_host(&pdev->dev, 0);
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if (IS_ERR(host)) {
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ret = PTR_ERR(host);
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dev_dbg(&pdev->dev, "error allocating host\n");
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goto err_alloc_host;
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}
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host->hw_name = "sdhci";
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host->ops = &sdhci_pltfm_ops;
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host->irq = platform_get_irq(pdev, 0);
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host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
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host->ioaddr = ioremap(iomem->start, resource_size(iomem));
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if (!host->ioaddr) {
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ret = -ENOMEM;
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dev_dbg(&pdev->dev, "failed to remap registers\n");
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goto err_ioremap;
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}
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ret = sdhci_add_host(host);
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if (ret) {
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dev_dbg(&pdev->dev, "error adding host\n");
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goto err_add_host;
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}
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platform_set_drvdata(pdev, host);
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/*
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* It is optional to use GPIOs for sdhci Power control & sdhci card
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* interrupt detection. If sdhci->data is NULL, then use original sdhci
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* lines otherwise GPIO lines.
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* If GPIO is selected for power control, then power should be disabled
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* after card removal and should be enabled when card insertion
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* interrupt occurs
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*/
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if (!sdhci->data)
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return 0;
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if (sdhci->data->card_power_gpio >= 0) {
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int val = 0;
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ret = gpio_request(sdhci->data->card_power_gpio, "sdhci");
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if (ret < 0) {
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dev_dbg(&pdev->dev, "gpio request fail: %d\n",
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sdhci->data->card_power_gpio);
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goto err_pgpio_request;
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}
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if (sdhci->data->power_always_enb)
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val = sdhci->data->power_active_high;
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else
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val = !sdhci->data->power_active_high;
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ret = gpio_direction_output(sdhci->data->card_power_gpio, val);
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if (ret) {
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dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
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sdhci->data->card_power_gpio);
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goto err_pgpio_direction;
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}
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gpio_set_value(sdhci->data->card_power_gpio, 1);
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}
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if (sdhci->data->card_int_gpio >= 0) {
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ret = gpio_request(sdhci->data->card_int_gpio, "sdhci");
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if (ret < 0) {
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dev_dbg(&pdev->dev, "gpio request fail: %d\n",
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sdhci->data->card_int_gpio);
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goto err_igpio_request;
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}
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ret = gpio_direction_input(sdhci->data->card_int_gpio);
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if (ret) {
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dev_dbg(&pdev->dev, "gpio set direction fail: %d\n",
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sdhci->data->card_int_gpio);
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goto err_igpio_direction;
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}
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ret = request_irq(gpio_to_irq(sdhci->data->card_int_gpio),
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sdhci_gpio_irq, IRQF_TRIGGER_LOW,
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mmc_hostname(host->mmc), pdev);
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if (ret) {
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dev_dbg(&pdev->dev, "gpio request irq fail: %d\n",
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sdhci->data->card_int_gpio);
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goto err_igpio_request_irq;
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}
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}
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return 0;
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err_igpio_request_irq:
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err_igpio_direction:
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if (sdhci->data->card_int_gpio >= 0)
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gpio_free(sdhci->data->card_int_gpio);
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err_igpio_request:
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err_pgpio_direction:
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if (sdhci->data->card_power_gpio >= 0)
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gpio_free(sdhci->data->card_power_gpio);
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err_pgpio_request:
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platform_set_drvdata(pdev, NULL);
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sdhci_remove_host(host, 1);
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err_add_host:
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iounmap(host->ioaddr);
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err_ioremap:
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sdhci_free_host(host);
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err_alloc_host:
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clk_disable(sdhci->clk);
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err_clk_enb:
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clk_put(sdhci->clk);
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err_clk_get:
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kfree(sdhci);
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err_kzalloc:
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release_mem_region(iomem->start, resource_size(iomem));
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err:
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dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
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return ret;
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}
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static int __devexit sdhci_remove(struct platform_device *pdev)
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev);
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int dead;
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u32 scratch;
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if (sdhci->data) {
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if (sdhci->data->card_int_gpio >= 0) {
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free_irq(gpio_to_irq(sdhci->data->card_int_gpio), pdev);
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gpio_free(sdhci->data->card_int_gpio);
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}
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if (sdhci->data->card_power_gpio >= 0)
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gpio_free(sdhci->data->card_power_gpio);
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}
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platform_set_drvdata(pdev, NULL);
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dead = 0;
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scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
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if (scratch == (u32)-1)
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dead = 1;
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sdhci_remove_host(host, dead);
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iounmap(host->ioaddr);
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sdhci_free_host(host);
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clk_disable(sdhci->clk);
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clk_put(sdhci->clk);
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kfree(sdhci);
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if (iomem)
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release_mem_region(iomem->start, resource_size(iomem));
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return 0;
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}
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static struct platform_driver sdhci_driver = {
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.driver = {
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.name = "sdhci",
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.owner = THIS_MODULE,
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},
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.probe = sdhci_probe,
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.remove = __devexit_p(sdhci_remove),
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};
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static int __init sdhci_init(void)
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{
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return platform_driver_register(&sdhci_driver);
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}
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module_init(sdhci_init);
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static void __exit sdhci_exit(void)
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{
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platform_driver_unregister(&sdhci_driver);
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}
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module_exit(sdhci_exit);
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MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
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MODULE_AUTHOR("Viresh Kumar <viresh.kumar@st.com>");
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MODULE_LICENSE("GPL v2");
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@ -0,0 +1,42 @@
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/*
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* include/linux/mmc/sdhci-spear.h
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*
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* SDHCI declarations specific to ST SPEAr platform
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*
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* Copyright (C) 2010 ST Microelectronics
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* Viresh Kumar<viresh.kumar@st.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#ifndef MMC_SDHCI_SPEAR_H
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#define MMC_SDHCI_SPEAR_H
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#include <linux/platform_device.h>
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/*
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* struct sdhci_plat_data: spear sdhci platform data structure
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*
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* @card_power_gpio: gpio pin for enabling/disabling power to sdhci socket
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* @power_active_high: if set, enable power to sdhci socket by setting
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* card_power_gpio
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* @power_always_enb: If set, then enable power on probe, otherwise enable only
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* on card insertion and disable on card removal.
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* card_int_gpio: gpio pin used for card detection
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*/
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struct sdhci_plat_data {
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int card_power_gpio;
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int power_active_high;
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int power_always_enb;
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int card_int_gpio;
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};
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/* This function is used to set platform_data field of pdev->dev */
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static inline void
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sdhci_set_plat_data(struct platform_device *pdev, struct sdhci_plat_data *data)
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{
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pdev->dev.platform_data = data;
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}
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#endif /* MMC_SDHCI_SPEAR_H */
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