sdhci-spear: ST SPEAr based SDHCI controller glue
authorViresh KUMAR <viresh.kumar@st.com>
Wed, 26 May 2010 21:42:10 +0000 (14:42 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 27 May 2010 16:12:40 +0000 (09:12 -0700)
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>
MAINTAINERS
drivers/mmc/host/Kconfig
drivers/mmc/host/Makefile
drivers/mmc/host/sdhci-spear.c [new file with mode: 0644]
include/linux/mmc/sdhci-spear.h [new file with mode: 0644]

index 18355cc1ce2618f1bde0013309dc97eda1a0570c..8b7eba2de603f08b131650b027d8dd82e69c0373 100644 (file)
@@ -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:)
index aeecbc932fbd0acaf726ed3adfd8bc15fa3b6b6d..e171e77f6129d8b80829099fabe0bdd1a8e25f71 100644 (file)
@@ -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
index 2447b66afeb3570531c9de009d079a1bdd6bc296..e30c2ee488942c711713647e731d888af5619d64 100644 (file)
@@ -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
diff --git a/drivers/mmc/host/sdhci-spear.c b/drivers/mmc/host/sdhci-spear.c
new file mode 100644 (file)
index 0000000..d70c54c
--- /dev/null
@@ -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");
diff --git a/include/linux/mmc/sdhci-spear.h b/include/linux/mmc/sdhci-spear.h
new file mode 100644 (file)
index 0000000..9188c97
--- /dev/null
@@ -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 */