[backfire] targets: rename "files-2.6.x" directories to "files"

[10.03/openwrt.git] / target / linux / rdc / files / arch / x86 / mach-rdc321x / gpio.c

diff --git a/target/linux/rdc/files/arch/x86/mach-rdc321x/gpio.c b/target/linux/rdc/files/arch/x86/mach-rdc321x/gpio.c
new file mode 100644 (file)
index 0000000..408a415
--- /dev/null
+++ b/target/linux/rdc/files/arch/x86/mach-rdc321x/gpio.c
@@ -0,0 +1,174 @@
+/*
+ * 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 <asm/rdc321x_defs.h>
+
+struct rdc321x_gpio {
+       spinlock_t      lock;
+       u32             data_reg[2];
+} rdc321x_gpio_dev;
+
+extern int rdc321x_pci_write(int reg, u32 val);
+extern int rdc321x_pci_read(int reg, u32 *val);
+
+/* read GPIO pin */
+static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+       u32 value = 0;
+       int reg;
+
+       reg = gpio < 32 ? RDC321X_GPIO_DATA_REG1 : RDC321X_GPIO_DATA_REG2;
+
+       spin_lock(&rdc321x_gpio_dev.lock);
+       rdc321x_pci_write(reg, rdc321x_gpio_dev.data_reg[gpio < 32 ? 0 : 1]);
+       rdc321x_pci_read(reg, &value);
+       spin_unlock(&rdc321x_gpio_dev.lock);
+
+       return (1 << (gpio & 0x1f)) & value ? 1 : 0;
+}
+
+static void rdc_gpio_set_value_impl(struct gpio_chip *chip,
+                               unsigned gpio, int value)
+{
+       int reg = (gpio < 32) ? 0 : 1;
+
+       if (value)
+               rdc321x_gpio_dev.data_reg[reg] |= 1 << (gpio & 0x1f);
+       else
+               rdc321x_gpio_dev.data_reg[reg] &= ~(1 << (gpio & 0x1f));
+
+       rdc321x_pci_write(reg ? RDC321X_GPIO_DATA_REG2 : RDC321X_GPIO_DATA_REG1,
+                              rdc321x_gpio_dev.data_reg[reg]);
+}
+
+/* set GPIO pin to value */
+static void rdc_gpio_set_value(struct gpio_chip *chip,
+                               unsigned gpio, int value)
+{
+       spin_lock(&rdc321x_gpio_dev.lock);
+       rdc_gpio_set_value_impl(chip, gpio, value);
+       spin_unlock(&rdc321x_gpio_dev.lock);
+}
+
+static int rdc_gpio_config(struct gpio_chip *chip,
+                               unsigned gpio, int value)
+{
+       int err;
+       u32 reg;
+
+       spin_lock(&rdc321x_gpio_dev.lock);
+       err = rdc321x_pci_read(gpio < 32 ? RDC321X_GPIO_CTRL_REG1 : RDC321X_GPIO_CTRL_REG2,
+                                                                               &reg);
+       if (err)
+               goto unlock;
+
+       reg |= 1 << (gpio & 0x1f);
+
+       err = rdc321x_pci_write(gpio < 32 ? RDC321X_GPIO_CTRL_REG1 : RDC321X_GPIO_CTRL_REG2,
+                                                                               reg);
+       if (err)
+               goto unlock;
+
+       rdc_gpio_set_value_impl(chip, gpio, value);
+
+unlock:
+       spin_unlock(&rdc321x_gpio_dev.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);
+}
+
+static struct gpio_chip rdc321x_gpio_chip = {
+       .label                  = "rdc321x-gpio",
+       .direction_input        = rdc_gpio_direction_input,
+       .direction_output       = rdc_gpio_config,
+       .get                    = rdc_gpio_get_value,
+       .set                    = rdc_gpio_set_value,
+       .base                   = 0,
+       .ngpio                  = RDC321X_MAX_GPIO,
+};
+
+/* initially setup the 2 copies of the gpio data registers.
+   This function is called before the platform setup code. */
+static int __devinit rdc321x_gpio_probe(struct platform_device *pdev)
+{
+       int err;
+
+       /* 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 = rdc321x_pci_read(RDC321X_GPIO_DATA_REG1, &rdc321x_gpio_dev.data_reg[0]);
+       if (err)
+               return err;
+
+       err = rdc321x_pci_read(RDC321X_GPIO_DATA_REG2, &rdc321x_gpio_dev.data_reg[1]);
+       if (err)
+               return err;
+
+       spin_lock_init(&rdc321x_gpio_dev.lock);
+
+       printk(KERN_INFO "rdc321x: registering %d GPIOs\n", rdc321x_gpio_chip.ngpio);
+       return gpiochip_add(&rdc321x_gpio_chip);
+}
+
+static int __devexit rdc321x_gpio_remove(struct platform_device *pdev)
+{
+       gpiochip_remove(&rdc321x_gpio_chip);
+       return 0;
+}
+
+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");