--- /dev/null
+This patch adds a new GPIO driver for the RDC321x SoC GPIO controller.
+
+Signed-off-by: Florian Fainelli <florian@openwrt.org>
+---
+Changes from v2:
+- initialize spinlock earlier
+- do not declare and assign gpch variables on the same line
+- use the pci_dev pointer passed as platform data
+- replaced rdc321x_pci_{read,write}
+
+Index: linux-2.6.32.10/drivers/gpio/Kconfig
+===================================================================
+--- linux-2.6.32.10.orig/drivers/gpio/Kconfig 2010-03-15 16:52:04.000000000 +0100
++++ linux-2.6.32.10/drivers/gpio/Kconfig 2010-04-28 11:39:02.000000000 +0200
+@@ -196,6 +196,14 @@
+ help
+ Say Y here to support Intel Moorestown platform GPIO.
+
++config GPIO_RDC321X
++ tristate "RDC R-321x GPIO support"
++ depends on PCI && GPIOLIB
++ select MFD_RDC321X
++ help
++ Support for the RDC R321x SoC GPIOs over southbridge
++ PCI configuration space.
++
+ comment "SPI GPIO expanders:"
+
+ config GPIO_MAX7301
+Index: linux-2.6.32.10/drivers/gpio/Makefile
+===================================================================
+--- linux-2.6.32.10.orig/drivers/gpio/Makefile 2010-03-15 16:52:04.000000000 +0100
++++ linux-2.6.32.10/drivers/gpio/Makefile 2010-04-28 11:39:17.000000000 +0200
+@@ -19,3 +19,4 @@
+ obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
+ obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o
+ obj-$(CONFIG_GPIO_WM831X) += wm831x-gpio.o
++obj-$(CONFIG_GPIO_RDC321X) += rdc321x-gpio.o
+Index: linux-2.6.32.10/drivers/gpio/rdc321x-gpio.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.32.10/drivers/gpio/rdc321x-gpio.c 2010-04-28 11:39:02.000000000 +0200
+@@ -0,0 +1,245 @@
++/*
++ * RDC321x GPIO driver
++ *
++ * Copyright (C) 2008, Volker Weiss <dev@tintuc.de>
++ * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
++ *
++ * 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; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
++ *
++ */
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/spinlock.h>
++#include <linux/platform_device.h>
++#include <linux/pci.h>
++#include <linux/gpio.h>
++#include <linux/mfd/rdc321x.h>
++
++struct rdc321x_gpio {
++ spinlock_t lock;
++ struct pci_dev *sb_pdev;
++ u32 data_reg[2];
++ int reg1_ctrl_base;
++ int reg1_data_base;
++ int reg2_ctrl_base;
++ int reg2_data_base;
++ struct gpio_chip chip;
++};
++
++/* read GPIO pin */
++static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
++{
++ struct rdc321x_gpio *gpch;
++ u32 value = 0;
++ int reg;
++
++ gpch = container_of(chip, struct rdc321x_gpio, chip);
++ reg = gpio < 32 ? gpch->reg1_data_base : gpch->reg2_data_base;
++
++ spin_lock(&gpch->lock);
++ pci_write_config_dword(gpch->sb_pdev, reg,
++ gpch->data_reg[gpio < 32 ? 0 : 1]);
++ pci_read_config_dword(gpch->sb_pdev, reg, &value);
++ spin_unlock(&gpch->lock);
++
++ return (1 << (gpio & 0x1f)) & value ? 1 : 0;
++}
++
++static void rdc_gpio_set_value_impl(struct gpio_chip *chip,
++ unsigned gpio, int value)
++{
++ struct rdc321x_gpio *gpch;
++ int reg = (gpio < 32) ? 0 : 1;
++
++ gpch = container_of(chip, struct rdc321x_gpio, chip);
++
++ if (value)
++ gpch->data_reg[reg] |= 1 << (gpio & 0x1f);
++ else
++ gpch->data_reg[reg] &= ~(1 << (gpio & 0x1f));
++
++ pci_write_config_dword(gpch->sb_pdev,
++ reg ? gpch->reg1_data_base : gpch->reg2_data_base,
++ gpch->data_reg[reg]);
++}
++
++/* set GPIO pin to value */
++static void rdc_gpio_set_value(struct gpio_chip *chip,
++ unsigned gpio, int value)
++{
++ struct rdc321x_gpio *gpch;
++
++ gpch = container_of(chip, struct rdc321x_gpio, chip);
++ spin_lock(&gpch->lock);
++ rdc_gpio_set_value_impl(chip, gpio, value);
++ spin_unlock(&gpch->lock);
++}
++
++static int rdc_gpio_config(struct gpio_chip *chip,
++ unsigned gpio, int value)
++{
++ struct rdc321x_gpio *gpch;
++ int err;
++ u32 reg;
++
++ gpch = container_of(chip, struct rdc321x_gpio, chip);
++
++ spin_lock(&gpch->lock);
++ err = pci_read_config_dword(gpch->sb_pdev, gpio < 32 ?
++ gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, ®);
++ if (err)
++ goto unlock;
++
++ reg |= 1 << (gpio & 0x1f);
++
++ err = pci_write_config_dword(gpch->sb_pdev, gpio < 32 ?
++ gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, reg);
++ if (err)
++ goto unlock;
++
++ rdc_gpio_set_value_impl(chip, gpio, value);
++
++unlock:
++ spin_unlock(&gpch->lock);
++
++ return err;
++}
++
++/* configure GPIO pin as input */
++static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
++{
++ return rdc_gpio_config(chip, gpio, 1);
++}
++
++/*
++ * Cache the initial value of both GPIO data registers
++ */
++static int __devinit rdc321x_gpio_probe(struct platform_device *pdev)
++{
++ int err;
++ struct resource *r;
++ struct rdc321x_gpio *rdc321x_gpio_dev;
++ struct rdc321x_gpio_pdata *pdata;
++
++ pdata = pdev->dev.platform_data;
++ if (!pdata) {
++ dev_err(&pdev->dev, "no platform data supplied\n");
++ return -ENODEV;
++ }
++
++ rdc321x_gpio_dev = kzalloc(sizeof(struct rdc321x_gpio), GFP_KERNEL);
++ if (!rdc321x_gpio_dev) {
++ dev_err(&pdev->dev, "failed to allocate private data\n");
++ return -ENOMEM;
++ }
++
++ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gpio-reg1");
++ if (!r) {
++ dev_err(&pdev->dev, "failed to get gpio-reg1 resource\n");
++ err = -ENODEV;
++ goto out_free;
++ }
++
++ spin_lock_init(&rdc321x_gpio_dev->lock);
++ rdc321x_gpio_dev->sb_pdev = pdata->sb_pdev;
++ rdc321x_gpio_dev->reg1_ctrl_base = r->start;
++ rdc321x_gpio_dev->reg1_data_base = r->start + 0x4;
++
++ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gpio-reg2");
++ if (!r) {
++ dev_err(&pdev->dev, "failed to get gpio-reg2 resource\n");
++ err = -ENODEV;
++ goto out_free;
++ }
++
++ rdc321x_gpio_dev->reg2_ctrl_base = r->start;
++ rdc321x_gpio_dev->reg2_data_base = r->start + 0x4;
++
++ rdc321x_gpio_dev->chip.label = "rdc321x-gpio";
++ rdc321x_gpio_dev->chip.direction_input = rdc_gpio_direction_input;
++ rdc321x_gpio_dev->chip.direction_output = rdc_gpio_config;
++ rdc321x_gpio_dev->chip.get = rdc_gpio_get_value;
++ rdc321x_gpio_dev->chip.set = rdc_gpio_set_value;
++ rdc321x_gpio_dev->chip.base = 0;
++ rdc321x_gpio_dev->chip.ngpio = pdata->max_gpios;
++
++ platform_set_drvdata(pdev, rdc321x_gpio_dev);
++
++ /* This might not be, what others (BIOS, bootloader, etc.)
++ wrote to these registers before, but it's a good guess. Still
++ better than just using 0xffffffff. */
++ err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
++ rdc321x_gpio_dev->reg1_data_base,
++ &rdc321x_gpio_dev->data_reg[0]);
++ if (err)
++ goto out_drvdata;
++
++ err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
++ rdc321x_gpio_dev->reg2_data_base,
++ &rdc321x_gpio_dev->data_reg[1]);
++ if (err)
++ goto out_drvdata;
++
++ dev_info(&pdev->dev, "registering %d GPIOs\n",
++ rdc321x_gpio_dev->chip.ngpio);
++ return gpiochip_add(&rdc321x_gpio_dev->chip);
++
++out_drvdata:
++ platform_set_drvdata(pdev, NULL);
++out_free:
++ kfree(rdc321x_gpio_dev);
++ return err;
++}
++
++static int __devexit rdc321x_gpio_remove(struct platform_device *pdev)
++{
++ int ret;
++ struct rdc321x_gpio *rdc321x_gpio_dev = platform_get_drvdata(pdev);
++
++ ret = gpiochip_remove(&rdc321x_gpio_dev->chip);
++ if (ret)
++ dev_err(&pdev->dev, "failed to unregister chip\n");
++
++ kfree(rdc321x_gpio_dev);
++ platform_set_drvdata(pdev, NULL);
++
++ return ret;
++}
++
++static struct platform_driver rdc321x_gpio_driver = {
++ .driver.name = "rdc321x-gpio",
++ .driver.owner = THIS_MODULE,
++ .probe = rdc321x_gpio_probe,
++ .remove = __devexit_p(rdc321x_gpio_remove),
++};
++
++static int __init rdc321x_gpio_init(void)
++{
++ return platform_driver_register(&rdc321x_gpio_driver);
++}
++
++static void __exit rdc321x_gpio_exit(void)
++{
++ platform_driver_unregister(&rdc321x_gpio_driver);
++}
++
++module_init(rdc321x_gpio_init);
++module_exit(rdc321x_gpio_exit);
++
++MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
++MODULE_DESCRIPTION("RDC321x GPIO driver");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS("platform:rdc321x-gpio");
projects / openwrt / svn-archive / archive.git / blobdiff