aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpio/vx855_gpio.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpio/vx855_gpio.c')
-rw-r--r--drivers/gpio/vx855_gpio.c333
1 files changed, 0 insertions, 333 deletions
diff --git a/drivers/gpio/vx855_gpio.c b/drivers/gpio/vx855_gpio.c
deleted file mode 100644
index ef5aabd8b8b7..000000000000
--- a/drivers/gpio/vx855_gpio.c
+++ /dev/null
@@ -1,333 +0,0 @@
-/*
- * Linux GPIOlib driver for the VIA VX855 integrated southbridge GPIO
- *
- * Copyright (C) 2009 VIA Technologies, Inc.
- * Copyright (C) 2010 One Laptop per Child
- * Author: Harald Welte <HaraldWelte@viatech.com>
- * All rights reserved.
- *
- * 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., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-#include <linux/pci.h>
-#include <linux/io.h>
-
-#define MODULE_NAME "vx855_gpio"
-
-/* The VX855 south bridge has the following GPIO pins:
- * GPI 0...13 General Purpose Input
- * GPO 0...12 General Purpose Output
- * GPIO 0...14 General Purpose I/O (Open-Drain)
- */
-
-#define NR_VX855_GPI 14
-#define NR_VX855_GPO 13
-#define NR_VX855_GPIO 15
-
-#define NR_VX855_GPInO (NR_VX855_GPI + NR_VX855_GPO)
-#define NR_VX855_GP (NR_VX855_GPI + NR_VX855_GPO + NR_VX855_GPIO)
-
-struct vx855_gpio {
- struct gpio_chip gpio;
- spinlock_t lock;
- u32 io_gpi;
- u32 io_gpo;
- bool gpi_reserved;
- bool gpo_reserved;
-};
-
-/* resolve a GPIx into the corresponding bit position */
-static inline u_int32_t gpi_i_bit(int i)
-{
- if (i < 10)
- return 1 << i;
- else
- return 1 << (i + 14);
-}
-
-static inline u_int32_t gpo_o_bit(int i)
-{
- if (i < 11)
- return 1 << i;
- else
- return 1 << (i + 14);
-}
-
-static inline u_int32_t gpio_i_bit(int i)
-{
- if (i < 14)
- return 1 << (i + 10);
- else
- return 1 << (i + 14);
-}
-
-static inline u_int32_t gpio_o_bit(int i)
-{
- if (i < 14)
- return 1 << (i + 11);
- else
- return 1 << (i + 13);
-}
-
-/* Mapping betwee numeric GPIO ID and the actual GPIO hardware numbering:
- * 0..13 GPI 0..13
- * 14..26 GPO 0..12
- * 27..41 GPIO 0..14
- */
-
-static int vx855gpio_direction_input(struct gpio_chip *gpio,
- unsigned int nr)
-{
- struct vx855_gpio *vg = container_of(gpio, struct vx855_gpio, gpio);
- unsigned long flags;
- u_int32_t reg_out;
-
- /* Real GPI bits are always in input direction */
- if (nr < NR_VX855_GPI)
- return 0;
-
- /* Real GPO bits cannot be put in output direction */
- if (nr < NR_VX855_GPInO)
- return -EINVAL;
-
- /* Open Drain GPIO have to be set to one */
- spin_lock_irqsave(&vg->lock, flags);
- reg_out = inl(vg->io_gpo);
- reg_out |= gpio_o_bit(nr - NR_VX855_GPInO);
- outl(reg_out, vg->io_gpo);
- spin_unlock_irqrestore(&vg->lock, flags);
-
- return 0;
-}
-
-static int vx855gpio_get(struct gpio_chip *gpio, unsigned int nr)
-{
- struct vx855_gpio *vg = container_of(gpio, struct vx855_gpio, gpio);
- u_int32_t reg_in;
- int ret = 0;
-
- if (nr < NR_VX855_GPI) {
- reg_in = inl(vg->io_gpi);
- if (reg_in & gpi_i_bit(nr))
- ret = 1;
- } else if (nr < NR_VX855_GPInO) {
- /* GPO don't have an input bit, we need to read it
- * back from the output register */
- reg_in = inl(vg->io_gpo);
- if (reg_in & gpo_o_bit(nr - NR_VX855_GPI))
- ret = 1;
- } else {
- reg_in = inl(vg->io_gpi);
- if (reg_in & gpio_i_bit(nr - NR_VX855_GPInO))
- ret = 1;
- }
-
- return ret;
-}
-
-static void vx855gpio_set(struct gpio_chip *gpio, unsigned int nr,
- int val)
-{
- struct vx855_gpio *vg = container_of(gpio, struct vx855_gpio, gpio);
- unsigned long flags;
- u_int32_t reg_out;
-
- /* True GPI cannot be switched to output mode */
- if (nr < NR_VX855_GPI)
- return;
-
- spin_lock_irqsave(&vg->lock, flags);
- reg_out = inl(vg->io_gpo);
- if (nr < NR_VX855_GPInO) {
- if (val)
- reg_out |= gpo_o_bit(nr - NR_VX855_GPI);
- else
- reg_out &= ~gpo_o_bit(nr - NR_VX855_GPI);
- } else {
- if (val)
- reg_out |= gpio_o_bit(nr - NR_VX855_GPInO);
- else
- reg_out &= ~gpio_o_bit(nr - NR_VX855_GPInO);
- }
- outl(reg_out, vg->io_gpo);
- spin_unlock_irqrestore(&vg->lock, flags);
-}
-
-static int vx855gpio_direction_output(struct gpio_chip *gpio,
- unsigned int nr, int val)
-{
- /* True GPI cannot be switched to output mode */
- if (nr < NR_VX855_GPI)
- return -EINVAL;
-
- /* True GPO don't need to be switched to output mode,
- * and GPIO are open-drain, i.e. also need no switching,
- * so all we do is set the level */
- vx855gpio_set(gpio, nr, val);
-
- return 0;
-}
-
-static const char *vx855gpio_names[NR_VX855_GP] = {
- "VX855_GPI0", "VX855_GPI1", "VX855_GPI2", "VX855_GPI3", "VX855_GPI4",
- "VX855_GPI5", "VX855_GPI6", "VX855_GPI7", "VX855_GPI8", "VX855_GPI9",
- "VX855_GPI10", "VX855_GPI11", "VX855_GPI12", "VX855_GPI13",
- "VX855_GPO0", "VX855_GPO1", "VX855_GPO2", "VX855_GPO3", "VX855_GPO4",
- "VX855_GPO5", "VX855_GPO6", "VX855_GPO7", "VX855_GPO8", "VX855_GPO9",
- "VX855_GPO10", "VX855_GPO11", "VX855_GPO12",
- "VX855_GPIO0", "VX855_GPIO1", "VX855_GPIO2", "VX855_GPIO3",
- "VX855_GPIO4", "VX855_GPIO5", "VX855_GPIO6", "VX855_GPIO7",
- "VX855_GPIO8", "VX855_GPIO9", "VX855_GPIO10", "VX855_GPIO11",
- "VX855_GPIO12", "VX855_GPIO13", "VX855_GPIO14"
-};
-
-static void vx855gpio_gpio_setup(struct vx855_gpio *vg)
-{
- struct gpio_chip *c = &vg->gpio;
-
- c->label = "VX855 South Bridge";
- c->owner = THIS_MODULE;
- c->direction_input = vx855gpio_direction_input;
- c->direction_output = vx855gpio_direction_output;
- c->get = vx855gpio_get;
- c->set = vx855gpio_set;
- c->dbg_show = NULL;
- c->base = 0;
- c->ngpio = NR_VX855_GP;
- c->can_sleep = 0;
- c->names = vx855gpio_names;
-}
-
-/* This platform device is ordinarily registered by the vx855 mfd driver */
-static __devinit int vx855gpio_probe(struct platform_device *pdev)
-{
- struct resource *res_gpi;
- struct resource *res_gpo;
- struct vx855_gpio *vg;
- int ret;
-
- res_gpi = platform_get_resource(pdev, IORESOURCE_IO, 0);
- res_gpo = platform_get_resource(pdev, IORESOURCE_IO, 1);
- if (!res_gpi || !res_gpo)
- return -EBUSY;
-
- vg = kzalloc(sizeof(*vg), GFP_KERNEL);
- if (!vg)
- return -ENOMEM;
-
- platform_set_drvdata(pdev, vg);
-
- dev_info(&pdev->dev, "found VX855 GPIO controller\n");
- vg->io_gpi = res_gpi->start;
- vg->io_gpo = res_gpo->start;
- spin_lock_init(&vg->lock);
-
- /*
- * A single byte is used to control various GPIO ports on the VX855,
- * and in the case of the OLPC XO-1.5, some of those ports are used
- * for switches that are interpreted and exposed through ACPI. ACPI
- * will have reserved the region, so our own reservation will not
- * succeed. Ignore and continue.
- */
-
- if (!request_region(res_gpi->start, resource_size(res_gpi),
- MODULE_NAME "_gpi"))
- dev_warn(&pdev->dev,
- "GPI I/O resource busy, probably claimed by ACPI\n");
- else
- vg->gpi_reserved = true;
-
- if (!request_region(res_gpo->start, resource_size(res_gpo),
- MODULE_NAME "_gpo"))
- dev_warn(&pdev->dev,
- "GPO I/O resource busy, probably claimed by ACPI\n");
- else
- vg->gpo_reserved = true;
-
- vx855gpio_gpio_setup(vg);
-
- ret = gpiochip_add(&vg->gpio);
- if (ret) {
- dev_err(&pdev->dev, "failed to register GPIOs\n");
- goto out_release;
- }
-
- return 0;
-
-out_release:
- if (vg->gpi_reserved)
- release_region(res_gpi->start, resource_size(res_gpi));
- if (vg->gpo_reserved)
- release_region(res_gpi->start, resource_size(res_gpo));
- platform_set_drvdata(pdev, NULL);
- kfree(vg);
- return ret;
-}
-
-static int __devexit vx855gpio_remove(struct platform_device *pdev)
-{
- struct vx855_gpio *vg = platform_get_drvdata(pdev);
- struct resource *res;
-
- if (gpiochip_remove(&vg->gpio))
- dev_err(&pdev->dev, "unable to remove gpio_chip?\n");
-
- if (vg->gpi_reserved) {
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- release_region(res->start, resource_size(res));
- }
- if (vg->gpo_reserved) {
- res = platform_get_resource(pdev, IORESOURCE_IO, 1);
- release_region(res->start, resource_size(res));
- }
-
- platform_set_drvdata(pdev, NULL);
- kfree(vg);
- return 0;
-}
-
-static struct platform_driver vx855gpio_driver = {
- .driver = {
- .name = MODULE_NAME,
- .owner = THIS_MODULE,
- },
- .probe = vx855gpio_probe,
- .remove = __devexit_p(vx855gpio_remove),
-};
-
-static int vx855gpio_init(void)
-{
- return platform_driver_register(&vx855gpio_driver);
-}
-module_init(vx855gpio_init);
-
-static void vx855gpio_exit(void)
-{
- platform_driver_unregister(&vx855gpio_driver);
-}
-module_exit(vx855gpio_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
-MODULE_DESCRIPTION("GPIO driver for the VIA VX855 chipset");
-MODULE_ALIAS("platform:vx855_gpio");