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Message-ID: <20100302100942.GB3195@sortiz.org>
Date: Tue, 2 Mar 2010 11:09:43 +0100
From: Samuel Ortiz <sameo@...ux.intel.com>
To: Denis Turischev <denis@...pulab.co.il>
Cc: LKML <linux-kernel@...r.kernel.org>,
David Brownell <dbrownell@...rs.sourceforge.net>
Subject: Re: [PATCH v4 3/3] gpio: add Intel SCH GPIO controller driver
Hi Denis,
On Mon, Mar 01, 2010 at 07:02:35PM +0200, Denis Turischev wrote:
> v2: there is no acpi_check_region, it will be implemented in mfd-core
> v3: patch refreshed against the latest Linus tree
> v4: refreshed again
I'm taking this one as well, unless David NACKs it.
Cheers,
Samuel.
> Signed-off-by: Denis Turischev <denis@...pulab.co.il>
> ---
> drivers/gpio/Kconfig | 16 +++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/sch_gpio.c | 282 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 299 insertions(+), 0 deletions(-)
> create mode 100644 drivers/gpio/sch_gpio.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 1f1d88a..1730068 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -85,6 +85,22 @@ 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_MAX732X
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 4868723..aa1d06e 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -22,3 +22,4 @@ obj-$(CONFIG_GPIO_CS5535) += cs5535-gpio.o
> obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
> obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o
> obj-$(CONFIG_GPIO_WM831X) += wm831x-gpio.o
> +obj-$(CONFIG_GPIO_SCH) += sch_gpio.o
> diff --git a/drivers/gpio/sch_gpio.c b/drivers/gpio/sch_gpio.c
> new file mode 100644
> 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@...pulab.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@...pulab.co.il>");
> +MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:sch_gpio");
> --
> 1.6.3.3
>
--
Intel Open Source Technology Centre
http://oss.intel.com/
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