[PATCH] gpio/ml_ioh_gpio: ML7213 GPIO driver

Tomoya MORINAGA
2010-12-23T11:56:31Z

ML7213 is companion chip for Intel Atom E6xx series.
This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output Hub) which
is for IVI(In-Vehicle Infotainment) use.
This driver can access the IOH's GPIO device.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
---
drivers/gpio/Kconfig | 9 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/ml_ioh_gpio.c | 345 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 355 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/ml_ioh_gpio.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 3143ac7..3dcd0ce 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -333,6 +333,15 @@ config GPIO_PCH
which is an IOH(Input/Output Hub) for x86 embedded processor.
This driver can access PCH GPIO device.

+config GPIO_ML_IOH
+ tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support"
+ depends on PCI
+ help
+ ML7213 is companion chip for Intel Atom E6xx series.
+ This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output
+ Hub) which is for IVI(In-Vehicle Infotainment) use.
+ This driver can access the IOH's 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 bdf3dde..b95f8c6 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -41,3 +41,4 @@ obj-$(CONFIG_GPIO_RDC321X) += rdc321x-gpio.o
obj-$(CONFIG_GPIO_JANZ_TTL) += janz-ttl.o
obj-$(CONFIG_GPIO_SX150X) += sx150x.o
obj-$(CONFIG_GPIO_VX855) += vx855_gpio.o
+obj-$(CONFIG_GPIO_ML_IOH) += ml_ioh_gpio.o
diff --git a/drivers/gpio/ml_ioh_gpio.c b/drivers/gpio/ml_ioh_gpio.c
new file mode 100644
index 0000000..4fa3224
--- /dev/null
+++ b/drivers/gpio/ml_ioh_gpio.c
@@ -0,0 +1,345 @@
+/*
+ * 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 PCI_VENDOR_ID_ROHM 0x10DB
+
+struct ioh_reg_comn {
+ u32 ien;
+ u32 istatus;
+ u32 idisp;
+ u32 iclr;
+ u32 imask;
+ u32 imaskclr;
+ u32 po;
+ u32 pi;
+ u32 pm;
+ u32 im_0;
+ u32 im_1;
+ u32 reserved;
+};
+
+struct ioh_regs {
+ struct ioh_reg_comn regs[8];
+ u32 reserve1[16];
+ u32 ioh_sel_reg[4];
+ u32 reserve2[11];
+ u32 srst;
+};
+
+/**
+ * struct ioh_gpio_reg_data - The register store data.
+ * @po_reg: To store contents of PO register.
+ * @pm_reg: To store contents of PM register.
+ */
+struct ioh_gpio_reg_data {
+ u32 po_reg;
+ u32 pm_reg;
+};
+
+/**
+ * struct ioh_gpio - GPIO private data structure.
+ * @base: PCI base address of Memory mapped I/O register.
+ * @reg: Memory mapped IOH GPIO register list.
+ * @dev: Pointer to device structure.
+ * @gpio: Data for GPIO infrastructure.
+ * @ioh_gpio_reg: Memory mapped Register data is saved here
+ * when suspend.
+ * @ch: Indicate GPIO channel
+ */
+struct ioh_gpio {
+ void __iomem *base;
+ struct ioh_regs __iomem *reg;
+ struct device *dev;
+ struct gpio_chip gpio;
+ struct ioh_gpio_reg_data ioh_gpio_reg;
+ struct mutex lock;
+ int ch;
+};
+
+static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
+
+static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
+{
+ u32 reg_val;
+ struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
+
+ mutex_lock(&chip->lock);
+ reg_val = ioread32(&chip->reg->regs[chip->ch].po);
+ if (val)
+ reg_val |= (1 << nr);
+ else
+ reg_val &= ~(1 << nr);
+
+ iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
+ mutex_unlock(&chip->lock);
+}
+
+static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
+{
+ struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
+
+ return ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr);
+}
+
+static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
+ int val)
+{
+ struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
+ u32 pm;
+ u32 reg_val;
+
+ mutex_lock(&chip->lock);
+ pm = ioread32(&chip->reg->regs[chip->ch].pm) &
+ ((1 << num_ports[chip->ch]) - 1);
+ pm |= (1 << nr);
+ iowrite32(pm, &chip->reg->regs[chip->ch].pm);
+
+ reg_val = ioread32(&chip->reg->regs[chip->ch].po);
+ if (val)
+ reg_val |= (1 << nr);
+ else
+ reg_val &= ~(1 << nr);
+
+ mutex_unlock(&chip->lock);
+
+ return 0;
+}
+
+static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
+{
+ struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
+ u32 pm;
+
+ mutex_lock(&chip->lock);
+ pm = ioread32(&chip->reg->regs[chip->ch].pm) &
+ ((1 << num_ports[chip->ch]) - 1);
+ pm &= ~(1 << nr);
+ iowrite32(pm, &chip->reg->regs[chip->ch].pm);
+ mutex_unlock(&chip->lock);
+
+ return 0;
+}
+
+/*
+ * Save register configuration and disable interrupts.
+ */
+static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
+{
+ chip->ioh_gpio_reg.po_reg = ioread32(&chip->reg->regs[chip->ch].po);
+ chip->ioh_gpio_reg.pm_reg = ioread32(&chip->reg->regs[chip->ch].pm);
+}
+
+/*
+ * This function restores the register configuration of the GPIO device.
+ */
+static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
+{
+ /* to store contents of PO register */
+ iowrite32(chip->ioh_gpio_reg.po_reg, &chip->reg->regs[chip->ch].po);
+ /* to store contents of PM register */
+ iowrite32(chip->ioh_gpio_reg.pm_reg, &chip->reg->regs[chip->ch].pm);
+}
+
+static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
+{
+ struct gpio_chip *gpio = &chip->gpio;
+
+ gpio->label = dev_name(chip->dev);
+ gpio->owner = THIS_MODULE;
+ gpio->direction_input = ioh_gpio_direction_input;
+ gpio->get = ioh_gpio_get;
+ gpio->direction_output = ioh_gpio_direction_output;
+ gpio->set = ioh_gpio_set;
+ gpio->dbg_show = NULL;
+ gpio->base = -1;
+ gpio->ngpio = num_port;
+ gpio->can_sleep = 0;
+}
+
+static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ int ret;
+ int i;
+ struct ioh_gpio *chip;
+ void __iomem *base;
+ void __iomem *chip_save;
+
+ 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;
+ }
+
+ base = pci_iomap(pdev, 1, 0);
+ if (base == 0) {
+ dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
+ ret = -ENOMEM;
+ goto err_iomap;
+ }
+
+ chip_save = kzalloc(sizeof(*chip) * 8, GFP_KERNEL);
+ if (chip_save == NULL) {
+ dev_err(&pdev->dev, "%s : kzalloc failed", __func__);
+ ret = -ENOMEM;
+ goto err_kzalloc;
+ }
+
+ for (i = 0, chip = chip_save; i < 8; i++, chip++) {
+ chip->dev = &pdev->dev;
+ chip->base = base;
+ chip->reg = chip->base;
+ chip->ch = i;
+ mutex_init(&chip->lock);
+ ioh_gpio_setup(chip, num_ports[i]);
+ ret = gpiochip_add(&chip->gpio);
+ if (ret) {
+ dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
+ goto err_gpiochip_add;
+ }
+ }
+
+ chip = chip_save;
+ pci_set_drvdata(pdev, chip);
+
+ return 0;
+
+err_gpiochip_add:
+ kfree(chip_save);
+
+err_kzalloc:
+ pci_iounmap(pdev, base);
+
+err_iomap:
+ pci_release_regions(pdev);
+
+err_request_regions:
+ pci_disable_device(pdev);
+
+err_pci_enable:
+
+ dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
+ return ret;
+}
+
+static void __devexit ioh_gpio_remove(struct pci_dev *pdev)
+{
+ int err;
+ int i;
+ struct ioh_gpio *chip = pci_get_drvdata(pdev);
+ void __iomem *chip_save;
+
+ chip_save = chip;
+ for (i = 0; i < 8; i++, chip++) {
+ err = gpiochip_remove(&chip->gpio);
+ if (err)
+ dev_err(&pdev->dev, "Failed gpiochip_remove\n");
+ }
+
+ chip = chip_save;
+ pci_iounmap(pdev, chip->base);
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ kfree(chip);
+}
+
+#ifdef CONFIG_PM
+static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ s32 ret;
+ struct ioh_gpio *chip = pci_get_drvdata(pdev);
+
+ ioh_gpio_save_reg_conf(chip);
+ ioh_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 ioh_gpio_resume(struct pci_dev *pdev)
+{
+ s32 ret;
+ struct ioh_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->srst);
+ iowrite32(0x00, &chip->reg->srst);
+ ioh_gpio_restore_reg_conf(chip);
+
+ return 0;
+}
+#else
+#define ioh_gpio_suspend NULL
+#define ioh_gpio_resume NULL
+#endif
+
+static DEFINE_PCI_DEVICE_TABLE(ioh_gpio_pcidev_id) = {
+ { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
+ { 0, }
+};
+
+static struct pci_driver ioh_gpio_driver = {
+ .name = "ml_ioh_gpio",
+ .id_table = ioh_gpio_pcidev_id,
+ .probe = ioh_gpio_probe,
+ .remove = __devexit_p(ioh_gpio_remove),
+ .suspend = ioh_gpio_suspend,
+ .resume = ioh_gpio_resume
+};
+
+static int __init ioh_gpio_pci_init(void)
+{
+ return pci_register_driver(&ioh_gpio_driver);
+}
+module_init(ioh_gpio_pci_init);
+
+static void __exit ioh_gpio_pci_exit(void)
+{
+ pci_unregister_driver(&ioh_gpio_driver);
+}
+module_exit(ioh_gpio_pci_exit);
+
+MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
+MODULE_LICENSE("GPL");
--
1.6.0.6