3 files changed, 321 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 3f3181dac8d7..dd9b4ba8d32d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -313,6 +313,14 @@ config GPIO_LANGWELL
         help
           Say Y here to support Intel Langwell/Penwell GPIO.
 
+config GPIO_PCH
+        tristate "PCH GPIO of Intel Topcliff"
+        depends on PCI
+        help
+          This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff
+          which is an IOH(Input/Output Hub) for x86 embedded processor.
+          This driver can access PCH GPIO device.
+
 config GPIO_TIMBERDALE
         bool "Support for timberdale GPIO IP"
         depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 0c23a4dd45e5..da2ecde5abdd 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_GPIO_MCP23S08)	+= mcp23s08.o
 obj-$(CONFIG_GPIO_74X164)       += 74x164.o
 obj-$(CONFIG_GPIO_PCA953X)      += pca953x.o
 obj-$(CONFIG_GPIO_PCF857X)      += pcf857x.o
+obj-$(CONFIG_GPIO_PCH)          += pch_gpio.o
 obj-$(CONFIG_GPIO_PL061)        += pl061.o
 obj-$(CONFIG_GPIO_STMPE)        += stmpe-gpio.o
 obj-$(CONFIG_GPIO_TC35892)      += tc35892-gpio.o
diff --git a/drivers/gpio/pch_gpio.c b/drivers/gpio/pch_gpio.c
new file mode 100644
index 000000000000..0eba0a75c804
--- /dev/null
+++ b/drivers/gpio/pch_gpio.c
@@ -0,0 +1,312 @@
+/*
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+
+#define PCH_GPIO_ALL_PINS       0xfff /* Mask for GPIO pins 0 to 11 */
+#define GPIO_NUM_PINS   12      /* Specifies number of GPIO PINS GPIO0-GPIO11 */
+
+struct pch_regs {
+        u32     ien;
+        u32     istatus;
+        u32     idisp;
+        u32     iclr;
+        u32     imask;
+        u32     imaskclr;
+        u32     po;
+        u32     pi;
+        u32     pm;
+        u32     im0;
+        u32     im1;
+        u32     reserved[4];
+        u32     reset;
+};
+
+/**
+ * struct pch_gpio_reg_data - The register store data.
+ * @po_reg:     To store contents of PO register.
+ * @pm_reg:     To store contents of PM register.
+ */
+struct pch_gpio_reg_data {
+        u32 po_reg;
+        u32 pm_reg;
+};
+
+/**
+ * struct pch_gpio - GPIO private data structure.
+ * @base:                       PCI base address of Memory mapped I/O register.
+ * @reg:                        Memory mapped PCH GPIO register list.
+ * @dev:                        Pointer to device structure.
+ * @gpio:                       Data for GPIO infrastructure.
+ * @pch_gpio_reg:               Memory mapped Register data is saved here
+ *                              when suspend.
+ */
+struct pch_gpio {
+        void __iomem *base;
+        struct pch_regs __iomem *reg;
+        struct device *dev;
+        struct gpio_chip gpio;
+        struct pch_gpio_reg_data pch_gpio_reg;
+        struct mutex lock;
+};
+
+static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
+{
+        u32 reg_val;
+        struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
+
+        mutex_lock(&chip->lock);
+        reg_val = ioread32(&chip->reg->po);
+        if (val)
+                reg_val |= (1 << nr);
+        else
+                reg_val &= ~(1 << nr);
+
+        iowrite32(reg_val, &chip->reg->po);
+        mutex_unlock(&chip->lock);
+}
+
+static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
+{
+        struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
+
+        return ioread32(&chip->reg->pi) & (1 << nr);
+}
+
+static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
+                                     int val)
+{
+        struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
+        u32 pm;
+        u32 reg_val;
+
+        mutex_lock(&chip->lock);
+        pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS;
+        pm |= (1 << nr);
+        iowrite32(pm, &chip->reg->pm);
+
+        reg_val = ioread32(&chip->reg->po);
+        if (val)
+                reg_val |= (1 << nr);
+        else
+                reg_val &= ~(1 << nr);
+
+        mutex_unlock(&chip->lock);
+
+        return 0;
+}
+
+static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
+{
+        struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
+        u32 pm;
+
+        mutex_lock(&chip->lock);
+        pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; /*bits 0-11*/
+        pm &= ~(1 << nr);
+        iowrite32(pm, &chip->reg->pm);
+        mutex_unlock(&chip->lock);
+
+        return 0;
+}
+
+/*
+ * Save register configuration and disable interrupts.
+ */
+static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
+{
+        chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
+        chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
+}
+
+/*
+ * This function restores the register configuration of the GPIO device.
+ */
+static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
+{
+        /* to store contents of PO register */
+        iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
+        /* to store contents of PM register */
+        iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
+}
+
+static void pch_gpio_setup(struct pch_gpio *chip)
+{
+        struct gpio_chip *gpio = &chip->gpio;
+
+        gpio->label = dev_name(chip->dev);
+        gpio->owner = THIS_MODULE;
+        gpio->direction_input = pch_gpio_direction_input;
+        gpio->get = pch_gpio_get;
+        gpio->direction_output = pch_gpio_direction_output;
+        gpio->set = pch_gpio_set;
+        gpio->dbg_show = NULL;
+        gpio->base = -1;
+        gpio->ngpio = GPIO_NUM_PINS;
+        gpio->can_sleep = 0;
+}
+
+static int __devinit pch_gpio_probe(struct pci_dev *pdev,
+                                    const struct pci_device_id *id)
+{
+        s32 ret;
+        struct pch_gpio *chip;
+
+        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+        if (chip == NULL)
+                return -ENOMEM;
+
+        chip->dev = &pdev->dev;
+        ret = pci_enable_device(pdev);
+        if (ret) {
+                dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
+                goto err_pci_enable;
+        }
+
+        ret = pci_request_regions(pdev, KBUILD_MODNAME);
+        if (ret) {
+                dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
+                goto err_request_regions;
+        }
+
+        chip->base = pci_iomap(pdev, 1, 0);
+        if (chip->base == 0) {
+                dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
+                ret = -ENOMEM;
+                goto err_iomap;
+        }
+
+        chip->reg = chip->base;
+        pci_set_drvdata(pdev, chip);
+        mutex_init(&chip->lock);
+        pch_gpio_setup(chip);
+        ret = gpiochip_add(&chip->gpio);
+        if (ret) {
+                dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
+                goto err_gpiochip_add;
+        }
+
+        return 0;
+
+err_gpiochip_add:
+        pci_iounmap(pdev, chip->base);
+
+err_iomap:
+        pci_release_regions(pdev);
+
+err_request_regions:
+        pci_disable_device(pdev);
+
+err_pci_enable:
+        kfree(chip);
+        dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
+        return ret;
+}
+
+static void __devexit pch_gpio_remove(struct pci_dev *pdev)
+{
+        int err;
+        struct pch_gpio *chip = pci_get_drvdata(pdev);
+
+        err = gpiochip_remove(&chip->gpio);
+        if (err)
+                dev_err(&pdev->dev, "Failed gpiochip_remove\n");
+
+        pci_iounmap(pdev, chip->base);
+        pci_release_regions(pdev);
+        pci_disable_device(pdev);
+        kfree(chip);
+}
+
+#ifdef CONFIG_PM
+static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        s32 ret;
+        struct pch_gpio *chip = pci_get_drvdata(pdev);
+
+        pch_gpio_save_reg_conf(chip);
+        pch_gpio_restore_reg_conf(chip);
+
+        ret = pci_save_state(pdev);
+        if (ret) {
+                dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
+                return ret;
+        }
+        pci_disable_device(pdev);
+        pci_set_power_state(pdev, PCI_D0);
+        ret = pci_enable_wake(pdev, PCI_D0, 1);
+        if (ret)
+                dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
+
+        return 0;
+}
+
+static int pch_gpio_resume(struct pci_dev *pdev)
+{
+        s32 ret;
+        struct pch_gpio *chip = pci_get_drvdata(pdev);
+
+        ret = pci_enable_wake(pdev, PCI_D0, 0);
+
+        pci_set_power_state(pdev, PCI_D0);
+        ret = pci_enable_device(pdev);
+        if (ret) {
+                dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
+                return ret;
+        }
+        pci_restore_state(pdev);
+
+        iowrite32(0x01, &chip->reg->reset);
+        iowrite32(0x00, &chip->reg->reset);
+        pch_gpio_restore_reg_conf(chip);
+
+        return 0;
+}
+#else
+#define pch_gpio_suspend NULL
+#define pch_gpio_resume NULL
+#endif
+
+static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = {
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
+        { 0, }
+};
+
+static struct pci_driver pch_gpio_driver = {
+        .name = "pch_gpio",
+        .id_table = pch_gpio_pcidev_id,
+        .probe = pch_gpio_probe,
+        .remove = __devexit_p(pch_gpio_remove),
+        .suspend = pch_gpio_suspend,
+        .resume = pch_gpio_resume
+};
+
+static int __init pch_gpio_pci_init(void)
+{
+        return pci_register_driver(&pch_gpio_driver);
+}
+module_init(pch_gpio_pci_init);
+
+static void __exit pch_gpio_pci_exit(void)
+{
+        pci_unregister_driver(&pch_gpio_driver);
+}
+module_exit(pch_gpio_pci_exit);
+
+MODULE_DESCRIPTION("PCH GPIO PCI Driver");
+MODULE_LICENSE("GPL");