gpio: add Intel SCH GPIO controller driver

Signed-off-by: Denis Turischev <denis@compulab.co.il>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index f42cb31..60cb363 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -94,6 +94,22 @@ config GPIO_VR41XX
        help
          Say yes here to support the NEC VR4100 series General-purpose I/O Uint
 
+config GPIO_SCH
+       tristate "Intel SCH GPIO"
+       depends on GPIOLIB
+       select LPC_SCH
+       help
+         Say yes here to support GPIO interface on Intel Poulsbo SCH.
+         The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
+         powered by the core power rail and are turned off during sleep
+         modes (S3 and higher). The remaining four GPIOs are powered by
+         the Intel SCH suspend power supply. These GPIOs remain
+         active during S3. The suspend powered GPIOs can be used to wake the
+         system from the Suspend-to-RAM state.
+
+         This driver can also be built as a module. If so, the module
+         will be called sch-gpio.
+
 comment "I2C GPIO expanders:"
 
 config GPIO_MAX7300

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 594bb70..10f3f8d 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -27,3 +27,4 @@ obj-$(CONFIG_GPIO_VR41XX)     += vr41xx_giu.o
 obj-$(CONFIG_GPIO_WM831X)      += wm831x-gpio.o
 obj-$(CONFIG_GPIO_WM8350)      += wm8350-gpiolib.o
 obj-$(CONFIG_GPIO_WM8994)      += wm8994-gpio.o
+obj-$(CONFIG_GPIO_SCH)         += sch_gpio.o
\ No newline at end of file

diff --git a/drivers/gpio/sch_gpio.c b/drivers/gpio/sch_gpio.c
new file mode 100644 (file)
index 0000000..761071a
--- /dev/null
+++ b/drivers/gpio/sch_gpio.c
@@ -0,0 +1,282 @@
+/*
+ *  sch_gpio.c - GPIO interface for Intel Poulsbo SCH
+ *
+ *  Copyright (c) 2010 CompuLab Ltd
+ *  Author: Denis Turischev <denis@compulab.co.il>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  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; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+
+#include <linux/gpio.h>
+
+static DEFINE_SPINLOCK(gpio_lock);
+
+#define CGEN   (0x00)
+#define CGIO   (0x04)
+#define CGLV   (0x08)
+
+#define RGEN   (0x20)
+#define RGIO   (0x24)
+#define RGLV   (0x28)
+
+static unsigned short gpio_ba;
+
+static int sch_gpio_core_direction_in(struct gpio_chip *gc, unsigned  gpio_num)
+{
+       u8 curr_dirs;
+       unsigned short offset, bit;
+
+       spin_lock(&gpio_lock);
+
+       offset = CGIO + gpio_num / 8;
+       bit = gpio_num % 8;
+
+       curr_dirs = inb(gpio_ba + offset);
+
+       if (!(curr_dirs & (1 << bit)))
+               outb(curr_dirs | (1 << bit), gpio_ba + offset);
+
+       spin_unlock(&gpio_lock);
+       return 0;
+}
+
+static int sch_gpio_core_get(struct gpio_chip *gc, unsigned gpio_num)
+{
+       int res;
+       unsigned short offset, bit;
+
+       offset = CGLV + gpio_num / 8;
+       bit = gpio_num % 8;
+
+       res = !!(inb(gpio_ba + offset) & (1 << bit));
+       return res;
+}
+
+static void sch_gpio_core_set(struct gpio_chip *gc, unsigned gpio_num, int val)
+{
+       u8 curr_vals;
+       unsigned short offset, bit;
+
+       spin_lock(&gpio_lock);
+
+       offset = CGLV + gpio_num / 8;
+       bit = gpio_num % 8;
+
+       curr_vals = inb(gpio_ba + offset);
+
+       if (val)
+               outb(curr_vals | (1 << bit), gpio_ba + offset);
+       else
+               outb((curr_vals & ~(1 << bit)), gpio_ba + offset);
+       spin_unlock(&gpio_lock);
+}
+
+static int sch_gpio_core_direction_out(struct gpio_chip *gc,
+                                       unsigned gpio_num, int val)
+{
+       u8 curr_dirs;
+       unsigned short offset, bit;
+
+       sch_gpio_core_set(gc, gpio_num, val);
+
+       spin_lock(&gpio_lock);
+
+       offset = CGIO + gpio_num / 8;
+       bit = gpio_num % 8;
+
+       curr_dirs = inb(gpio_ba + offset);
+       if (curr_dirs & (1 << bit))
+               outb(curr_dirs & ~(1 << bit), gpio_ba + offset);
+
+       spin_unlock(&gpio_lock);
+       return 0;
+}
+
+static struct gpio_chip sch_gpio_core = {
+       .label                  = "sch_gpio_core",
+       .owner                  = THIS_MODULE,
+       .direction_input        = sch_gpio_core_direction_in,
+       .get                    = sch_gpio_core_get,
+       .direction_output       = sch_gpio_core_direction_out,
+       .set                    = sch_gpio_core_set,
+};
+
+static int sch_gpio_resume_direction_in(struct gpio_chip *gc,
+                                       unsigned gpio_num)
+{
+       u8 curr_dirs;
+
+       spin_lock(&gpio_lock);
+
+       curr_dirs = inb(gpio_ba + RGIO);
+
+       if (!(curr_dirs & (1 << gpio_num)))
+               outb(curr_dirs | (1 << gpio_num) , gpio_ba + RGIO);
+
+       spin_unlock(&gpio_lock);
+       return 0;
+}
+
+static int sch_gpio_resume_get(struct gpio_chip *gc, unsigned gpio_num)
+{
+       return !!(inb(gpio_ba + RGLV) & (1 << gpio_num));
+}
+
+static void sch_gpio_resume_set(struct gpio_chip *gc,
+                               unsigned gpio_num, int val)
+{
+       u8 curr_vals;
+
+       spin_lock(&gpio_lock);
+
+       curr_vals = inb(gpio_ba + RGLV);
+
+       if (val)
+               outb(curr_vals | (1 << gpio_num), gpio_ba + RGLV);
+       else
+               outb((curr_vals & ~(1 << gpio_num)), gpio_ba + RGLV);
+
+       spin_unlock(&gpio_lock);
+}
+
+static int sch_gpio_resume_direction_out(struct gpio_chip *gc,
+                                       unsigned gpio_num, int val)
+{
+       u8 curr_dirs;
+
+       sch_gpio_resume_set(gc, gpio_num, val);
+
+       spin_lock(&gpio_lock);
+
+       curr_dirs = inb(gpio_ba + RGIO);
+       if (curr_dirs & (1 << gpio_num))
+               outb(curr_dirs & ~(1 << gpio_num), gpio_ba + RGIO);
+
+       spin_unlock(&gpio_lock);
+       return 0;
+}
+
+static struct gpio_chip sch_gpio_resume = {
+       .label                  = "sch_gpio_resume",
+       .owner                  = THIS_MODULE,
+       .direction_input        = sch_gpio_resume_direction_in,
+       .get                    = sch_gpio_resume_get,
+       .direction_output       = sch_gpio_resume_direction_out,
+       .set                    = sch_gpio_resume_set,
+};
+
+static int __devinit sch_gpio_probe(struct platform_device *pdev)
+{
+       struct resource *res;
+       int err;
+
+       res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+       if (!res)
+               return -EBUSY;
+
+       if (!request_region(res->start, resource_size(res), pdev->name))
+               return -EBUSY;
+
+       gpio_ba = res->start;
+
+       sch_gpio_core.base = 0;
+       sch_gpio_core.ngpio = 10;
+       sch_gpio_core.dev = &pdev->dev;
+
+       sch_gpio_resume.base = 10;
+       sch_gpio_resume.ngpio = 4;
+       sch_gpio_resume.dev = &pdev->dev;
+
+       err = gpiochip_add(&sch_gpio_core);
+       if (err < 0)
+               goto err_sch_gpio_core;
+
+       err = gpiochip_add(&sch_gpio_resume);
+       if (err < 0)
+               goto err_sch_gpio_resume;
+
+       /*
+        * GPIO[6:0] enabled by default
+        * GPIO7 is configured by the CMC as SLPIOVR
+        * Enable GPIO[9:8] core powered gpios explicitly
+        */
+       outb(0x3, gpio_ba + CGEN + 1);
+       /*
+        * SUS_GPIO[2:0] enabled by default
+        * Enable SUS_GPIO3 resume powered gpio explicitly
+        */
+       outb(0x8, gpio_ba + RGEN);
+
+       return 0;
+
+err_sch_gpio_resume:
+       gpiochip_remove(&sch_gpio_core);
+
+err_sch_gpio_core:
+       release_region(res->start, resource_size(res));
+       gpio_ba = 0;
+
+       return err;
+}
+
+static int __devexit sch_gpio_remove(struct platform_device *pdev)
+{
+       struct resource *res;
+       if (gpio_ba) {
+               gpiochip_remove(&sch_gpio_core);
+               gpiochip_remove(&sch_gpio_resume);
+
+               res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+
+               release_region(res->start, resource_size(res));
+               gpio_ba = 0;
+       }
+
+       return 0;
+}
+
+static struct platform_driver sch_gpio_driver = {
+       .driver = {
+               .name = "sch_gpio",
+               .owner = THIS_MODULE,
+       },
+       .probe          = sch_gpio_probe,
+       .remove         = __devexit_p(sch_gpio_remove),
+};
+
+static int __init sch_gpio_init(void)
+{
+       return platform_driver_register(&sch_gpio_driver);
+}
+
+static void __exit sch_gpio_exit(void)
+{
+       platform_driver_unregister(&sch_gpio_driver);
+}
+
+module_init(sch_gpio_init);
+module_exit(sch_gpio_exit);
+
+MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
+MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sch_gpio");