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Message-ID: <51D56D70.3000700@compulab.co.il>
Date: Thu, 04 Jul 2013 15:41:20 +0300
From: Denis Turischev <denis.turischev@...pulab.co.il>
To: linux-kernel@...r.kernel.org
CC: Grant Likely <grant.likely@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>
Subject: gpio: introduce gpio-fch driver for AMD A45/A50M/A55E Fusion Controller
Hub
Signed-off-by: Denis Turischev <denis.turischev@...pulab.co.il>
diff -uprN linux-3.10.orig/drivers/gpio/gpio-fch.c linux-3.10/drivers/gpio/gpio-fch.c
--- linux-3.10.orig/drivers/gpio/gpio-fch.c 1970-01-01 02:00:00.000000000 +0200
+++ linux-3.10/drivers/gpio/gpio-fch.c 2013-07-04 15:35:50.020672040 +0300
@@ -0,0 +1,247 @@
+/*
+ * gpio-fch.c - GPIO interface for AMD Fusion Controller Hub
+ *
+ * Copyright (c) 2013 CompuLab Ltd
+ * Author: Denis Turischev <denis.turischev@...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/errno.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+
+static void __iomem *gpio_ba;
+u32 acpimmioaddr;
+
+#define GPIO_SPACE_OFFSET 0x100
+#define GPIO_SPACE_SIZE 0x100
+
+static DEFINE_SPINLOCK(gpio_lock);
+
+static DEFINE_PCI_DEVICE_TABLE(gpio_fch_tbl) = {
+ { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, gpio_fch_tbl);
+
+static int gpio_fch_direction_in(struct gpio_chip *gc, unsigned gpio_num)
+{
+ u8 curr_state;
+
+ spin_lock(&gpio_lock);
+
+ curr_state = ioread8(gpio_ba + gpio_num);
+ if (!(curr_state & (1 << 5)))
+ iowrite8(curr_state | (1 << 5), gpio_ba + gpio_num);
+
+ spin_unlock(&gpio_lock);
+ return 0;
+}
+
+static int gpio_fch_get(struct gpio_chip *gc, unsigned gpio_num)
+{
+ u8 curr_state, bit;
+ int res;
+
+ curr_state = ioread8(gpio_ba + gpio_num);
+
+ bit = 6;
+ if (curr_state & (1 << 5))
+ bit = 7;
+
+ res = !!((curr_state) & (1 << bit));
+ return res;
+}
+
+static void gpio_fch_set(struct gpio_chip *gc, unsigned gpio_num, int val)
+{
+ u8 curr_state;
+
+ spin_lock(&gpio_lock);
+
+ curr_state = ioread8(gpio_ba + gpio_num);
+ iowrite8((curr_state & ~(1 << 5)), gpio_ba + gpio_num);
+
+ if (val)
+ iowrite8(curr_state | (1 << 6), gpio_ba + gpio_num);
+ else
+ iowrite8(curr_state & ~(1 << 6), gpio_ba + gpio_num);
+
+ spin_unlock(&gpio_lock);
+}
+
+static int gpio_fch_direction_out(struct gpio_chip *gc,
+ unsigned gpio_num, int val)
+{
+ u8 curr_state;
+
+ spin_lock(&gpio_lock);
+
+ curr_state = ioread8(gpio_ba + gpio_num);
+
+ if (curr_state & (1 << 5))
+ iowrite8(curr_state & ~(1 << 5), gpio_ba + gpio_num);
+
+ spin_unlock(&gpio_lock);
+ return 0;
+}
+
+u32 read_pm_reg(u8 port)
+{
+ u32 res;
+
+ outb(port + 3, 0xCD6);
+ res = inb(0xCD7);
+ res = res << 8;
+
+ outb(port + 2, 0xCD6);
+ res = res + inb(0xCD7);
+ res = res << 8;
+
+ outb(port + 1, 0xCD6);
+ res = res + inb(0xCD7);
+ res = res << 8;
+
+ outb(port, 0xCD6);
+ res = res + inb(0xCD7);
+
+ return res;
+}
+
+static struct gpio_chip fch_gpio_chip0 = {
+ .label = "gpio_fch",
+ .owner = THIS_MODULE,
+ .get = gpio_fch_get,
+ .direction_input = gpio_fch_direction_in,
+ .set = gpio_fch_set,
+ .direction_output = gpio_fch_direction_out,
+};
+
+static struct gpio_chip fch_gpio_chip128 = {
+ .label = "gpio_fch",
+ .owner = THIS_MODULE,
+ .get = gpio_fch_get,
+ .direction_input = gpio_fch_direction_in,
+ .set = gpio_fch_set,
+ .direction_output = gpio_fch_direction_out,
+};
+
+static struct gpio_chip fch_gpio_chip160 = {
+ .label = "gpio_fch",
+ .owner = THIS_MODULE,
+ .get = gpio_fch_get,
+ .direction_input = gpio_fch_direction_in,
+ .set = gpio_fch_set,
+ .direction_output = gpio_fch_direction_out,
+};
+
+static int gpio_fch_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ int ret;
+
+ acpimmioaddr = read_pm_reg(0x24) & 0xFFFFF000;
+
+ if (!request_mem_region(acpimmioaddr + GPIO_SPACE_OFFSET,
+ GPIO_SPACE_SIZE, fch_gpio_chip0.label))
+ return -EBUSY;
+
+ gpio_ba = ioremap(acpimmioaddr + GPIO_SPACE_OFFSET, GPIO_SPACE_SIZE);
+ if (!gpio_ba) {
+ ret = -ENOMEM;
+ goto err_no_ioremap;
+ }
+
+ fch_gpio_chip0.base = 0;
+ fch_gpio_chip0.ngpio = 68;
+
+ fch_gpio_chip128.base = 128;
+ fch_gpio_chip128.ngpio = 23;
+
+ fch_gpio_chip160.base = 160;
+ fch_gpio_chip160.ngpio = 69;
+
+ ret = gpiochip_add(&fch_gpio_chip0);
+ if (ret < 0)
+ goto err_no_gpiochip0_add;
+
+ ret = gpiochip_add(&fch_gpio_chip128);
+ if (ret < 0)
+ goto err_no_gpiochip128_add;
+
+ ret = gpiochip_add(&fch_gpio_chip160);
+ if (ret < 0)
+ goto err_no_gpiochip160_add;
+
+ return 0;
+
+err_no_gpiochip160_add:
+ ret = gpiochip_remove(&fch_gpio_chip128);
+ if (ret)
+ dev_err(&pdev->dev, "%s failed, %d\n",
+ "gpiochip_remove()", ret);
+
+err_no_gpiochip128_add:
+ ret = gpiochip_remove(&fch_gpio_chip0);
+ if (ret)
+ dev_err(&pdev->dev, "%s failed, %d\n",
+ "gpiochip_remove()", ret);
+
+err_no_gpiochip0_add:
+ iounmap(gpio_ba);
+
+err_no_ioremap:
+ release_mem_region(acpimmioaddr + GPIO_SPACE_OFFSET, GPIO_SPACE_SIZE);
+ return ret;
+}
+
+static void gpio_fch_remove(struct pci_dev *pdev)
+{
+ int ret;
+
+ ret = gpiochip_remove(&fch_gpio_chip160);
+ if (ret < 0)
+ dev_err(&pdev->dev, "%s failed, %d\n",
+ "gpiochip_remove()", ret);
+
+ ret = gpiochip_remove(&fch_gpio_chip128);
+ if (ret < 0)
+ dev_err(&pdev->dev, "%s failed, %d\n",
+ "gpiochip_remove()", ret);
+
+ ret = gpiochip_remove(&fch_gpio_chip0);
+ if (ret < 0)
+ dev_err(&pdev->dev, "%s failed, %d\n",
+ "gpiochip_remove()", ret);
+
+ iounmap(gpio_ba);
+ release_mem_region(acpimmioaddr + GPIO_SPACE_OFFSET, GPIO_SPACE_SIZE);
+}
+
+static struct pci_driver gpio_fch_driver = {
+ .name = "gpio_fch",
+ .id_table = gpio_fch_tbl,
+ .probe = gpio_fch_probe,
+ .remove = gpio_fch_remove,
+};
+
+module_pci_driver(gpio_fch_driver);
+
+MODULE_AUTHOR("Denis Turischev <denis@...pulab.co.il>");
+MODULE_DESCRIPTION("GPIO interface for AMD Fusion Controller Hub");
+MODULE_LICENSE("GPL");
+
diff -uprN linux-3.10.orig/drivers/gpio/Kconfig linux-3.10/drivers/gpio/Kconfig
--- linux-3.10.orig/drivers/gpio/Kconfig 2013-07-01 01:13:29.000000000 +0300
+++ linux-3.10/drivers/gpio/Kconfig 2013-07-04 14:12:15.412806610 +0300
@@ -135,6 +135,17 @@ config GPIO_EP93XX
depends on ARCH_EP93XX
select GPIO_GENERIC
+config GPIO_FCH
+ tristate "AMD A45/A50M/A55E Fusion Controller Hub GPIO"
+ depends on PCI && X86
+ default m
+ help
+ GPIO interface for AMD A45/A50M/A55E Fusion Controller Hub.
+ Available GPIOs are 0-67, 128-150, 160-228.
+
+ Part of GPIOs is usually occupied by BIOS for it's internal needs, so
+ use them with care.
+
config GPIO_MM_LANTIQ
bool "Lantiq Memory mapped GPIOs"
depends on LANTIQ && SOC_XWAY
diff -uprN linux-3.10.orig/drivers/gpio/Makefile linux-3.10/drivers/gpio/Makefile
--- linux-3.10.orig/drivers/gpio/Makefile 2013-07-01 01:13:29.000000000 +0300
+++ linux-3.10/drivers/gpio/Makefile 2013-07-04 09:39:38.605245556 +0300
@@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_DA9055) += gpio-da9055
obj-$(CONFIG_ARCH_DAVINCI) += gpio-davinci.o
obj-$(CONFIG_GPIO_EM) += gpio-em.o
obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o
+obj-$(CONFIG_GPIO_FCH) += gpio-fch.o
obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o
obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o
obj-$(CONFIG_GPIO_ICH) += gpio-ich.o
--
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