296 lines
6.4 KiB
C
296 lines
6.4 KiB
C
/*
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* sch_gpio.c - GPIO interface for Intel Poulsbo SCH
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*
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* Copyright (c) 2010 CompuLab Ltd
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* Author: Denis Turischev <denis@compulab.co.il>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/errno.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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static DEFINE_SPINLOCK(gpio_lock);
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#define CGEN (0x00)
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#define CGIO (0x04)
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#define CGLV (0x08)
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#define RGEN (0x20)
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#define RGIO (0x24)
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#define RGLV (0x28)
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static unsigned short gpio_ba;
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static int sch_gpio_core_direction_in(struct gpio_chip *gc, unsigned gpio_num)
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{
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u8 curr_dirs;
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unsigned short offset, bit;
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spin_lock(&gpio_lock);
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offset = CGIO + gpio_num / 8;
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bit = gpio_num % 8;
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curr_dirs = inb(gpio_ba + offset);
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if (!(curr_dirs & (1 << bit)))
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outb(curr_dirs | (1 << bit), gpio_ba + offset);
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spin_unlock(&gpio_lock);
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return 0;
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}
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static int sch_gpio_core_get(struct gpio_chip *gc, unsigned gpio_num)
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{
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int res;
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unsigned short offset, bit;
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offset = CGLV + gpio_num / 8;
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bit = gpio_num % 8;
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res = !!(inb(gpio_ba + offset) & (1 << bit));
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return res;
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}
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static void sch_gpio_core_set(struct gpio_chip *gc, unsigned gpio_num, int val)
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{
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u8 curr_vals;
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unsigned short offset, bit;
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spin_lock(&gpio_lock);
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offset = CGLV + gpio_num / 8;
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bit = gpio_num % 8;
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curr_vals = inb(gpio_ba + offset);
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if (val)
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outb(curr_vals | (1 << bit), gpio_ba + offset);
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else
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outb((curr_vals & ~(1 << bit)), gpio_ba + offset);
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spin_unlock(&gpio_lock);
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}
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static int sch_gpio_core_direction_out(struct gpio_chip *gc,
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unsigned gpio_num, int val)
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{
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u8 curr_dirs;
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unsigned short offset, bit;
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sch_gpio_core_set(gc, gpio_num, val);
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spin_lock(&gpio_lock);
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offset = CGIO + gpio_num / 8;
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bit = gpio_num % 8;
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curr_dirs = inb(gpio_ba + offset);
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if (curr_dirs & (1 << bit))
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outb(curr_dirs & ~(1 << bit), gpio_ba + offset);
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spin_unlock(&gpio_lock);
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return 0;
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}
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static struct gpio_chip sch_gpio_core = {
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.label = "sch_gpio_core",
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.owner = THIS_MODULE,
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.direction_input = sch_gpio_core_direction_in,
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.get = sch_gpio_core_get,
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.direction_output = sch_gpio_core_direction_out,
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.set = sch_gpio_core_set,
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};
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static int sch_gpio_resume_direction_in(struct gpio_chip *gc,
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unsigned gpio_num)
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{
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u8 curr_dirs;
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spin_lock(&gpio_lock);
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curr_dirs = inb(gpio_ba + RGIO);
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if (!(curr_dirs & (1 << gpio_num)))
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outb(curr_dirs | (1 << gpio_num) , gpio_ba + RGIO);
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spin_unlock(&gpio_lock);
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return 0;
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}
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static int sch_gpio_resume_get(struct gpio_chip *gc, unsigned gpio_num)
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{
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return !!(inb(gpio_ba + RGLV) & (1 << gpio_num));
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}
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static void sch_gpio_resume_set(struct gpio_chip *gc,
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unsigned gpio_num, int val)
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{
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u8 curr_vals;
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spin_lock(&gpio_lock);
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curr_vals = inb(gpio_ba + RGLV);
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if (val)
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outb(curr_vals | (1 << gpio_num), gpio_ba + RGLV);
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else
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outb((curr_vals & ~(1 << gpio_num)), gpio_ba + RGLV);
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spin_unlock(&gpio_lock);
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}
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static int sch_gpio_resume_direction_out(struct gpio_chip *gc,
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unsigned gpio_num, int val)
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{
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u8 curr_dirs;
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sch_gpio_resume_set(gc, gpio_num, val);
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spin_lock(&gpio_lock);
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curr_dirs = inb(gpio_ba + RGIO);
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if (curr_dirs & (1 << gpio_num))
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outb(curr_dirs & ~(1 << gpio_num), gpio_ba + RGIO);
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spin_unlock(&gpio_lock);
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return 0;
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}
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static struct gpio_chip sch_gpio_resume = {
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.label = "sch_gpio_resume",
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.owner = THIS_MODULE,
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.direction_input = sch_gpio_resume_direction_in,
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.get = sch_gpio_resume_get,
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.direction_output = sch_gpio_resume_direction_out,
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.set = sch_gpio_resume_set,
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};
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static int __devinit sch_gpio_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int err;
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (!res)
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return -EBUSY;
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if (!request_region(res->start, resource_size(res), pdev->name))
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return -EBUSY;
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gpio_ba = res->start;
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sch_gpio_core.base = 0;
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sch_gpio_core.ngpio = 10;
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sch_gpio_core.dev = &pdev->dev;
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sch_gpio_resume.base = 10;
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sch_gpio_resume.ngpio = 4;
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sch_gpio_resume.dev = &pdev->dev;
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err = gpiochip_add(&sch_gpio_core);
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if (err < 0)
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goto err_sch_gpio_core;
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err = gpiochip_add(&sch_gpio_resume);
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if (err < 0)
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goto err_sch_gpio_resume;
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/*
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* GPIO[6:0] enabled by default
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* GPIO7 is configured by the CMC as SLPIOVR
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* Enable GPIO[9:8] core powered gpios explicitly
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*/
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outb(0x3, gpio_ba + CGEN + 1);
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/*
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* SUS_GPIO[2:0] enabled by default
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* Enable SUS_GPIO3 resume powered gpio explicitly
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*/
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outb(0x8, gpio_ba + RGEN);
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return 0;
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err_sch_gpio_resume:
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err = gpiochip_remove(&sch_gpio_core);
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if (err)
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dev_err(&pdev->dev, "%s failed, %d\n",
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"gpiochip_remove()", err);
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err_sch_gpio_core:
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release_region(res->start, resource_size(res));
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gpio_ba = 0;
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return err;
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}
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static int __devexit sch_gpio_remove(struct platform_device *pdev)
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{
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struct resource *res;
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if (gpio_ba) {
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int err;
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err = gpiochip_remove(&sch_gpio_core);
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if (err)
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dev_err(&pdev->dev, "%s failed, %d\n",
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"gpiochip_remove()", err);
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err = gpiochip_remove(&sch_gpio_resume);
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if (err)
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dev_err(&pdev->dev, "%s failed, %d\n",
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"gpiochip_remove()", err);
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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release_region(res->start, resource_size(res));
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gpio_ba = 0;
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return err;
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}
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return 0;
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}
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static struct platform_driver sch_gpio_driver = {
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.driver = {
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.name = "sch_gpio",
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.owner = THIS_MODULE,
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},
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.probe = sch_gpio_probe,
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.remove = __devexit_p(sch_gpio_remove),
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};
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static int __init sch_gpio_init(void)
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{
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return platform_driver_register(&sch_gpio_driver);
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}
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static void __exit sch_gpio_exit(void)
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{
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platform_driver_unregister(&sch_gpio_driver);
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}
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module_init(sch_gpio_init);
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module_exit(sch_gpio_exit);
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MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
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MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:sch_gpio");
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