1 files changed, 316 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
new file mode 100644
index 0000000..36919e7
--- /dev/null
+++ b/drivers/gpio/gpio-pch.c
@@ -0,0 +1,316 @@
+/*
+ * 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);
+	iowrite32(reg_val, &chip->reg->po);
+
+	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
+
+#define PCI_VENDOR_ID_ROHM             0x10DB
+static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) },
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);
+
+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");