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Date: Tue, 15 Jun 2010 14:11:07 -0700
From: Gregory Bean <gbean@...eaurora.org>
To: akpm@...ux-foundation.org
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
Gregory Bean <gbean@...eaurora.org>,
Joe Perches <joe@...ches.com>,
"David S. Miller" <davem@...emloft.net>,
Samuel Ortiz <sameo@...ux.intel.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Randy Dunlap <randy.dunlap@...cle.com>,
Michael Hennerich <michael.hennerich@...log.com>,
Mike Frysinger <vapier@...too.org>,
David Brown <davidb@...eaurora.org>,
Daniel Walker <dwalker@...eaurora.org>,
Bryan Huntsman <bryanh@...eaurora.org>
Subject: [PATCH 1/2 v4] gpio: msm7200a: Add gpiolib support for MSM chips.
Add support for uniprocessor MSM chips whose TLMM/GPIO design
is the same as the MSM7200A.
This includes, but is not necessarily limited to, the:
MSM7200A, MSM7x25, MSM7x27, MSM7x30, QSD8x50, QSD8x50A
Signed-off-by: Gregory Bean <gbean@...eaurora.org>
---
MAINTAINERS | 2 +
drivers/gpio/Kconfig | 8 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/msm7200a-gpio.c | 187 +++++++++++++++++++++++++++++++++++++++++
include/linux/msm7200a-gpio.h | 62 ++++++++++++++
5 files changed, 260 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/msm7200a-gpio.c
create mode 100644 include/linux/msm7200a-gpio.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 6d119c9..bdfd31d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -819,6 +819,8 @@ F: drivers/mmc/host/msm_sdcc.c
F: drivers/mmc/host/msm_sdcc.h
F: drivers/serial/msm_serial.h
F: drivers/serial/msm_serial.c
+F: drivers/gpio/msm7200a-gpio.c
+F: include/linux/msm7200a-gpio.h
T: git git://codeaurora.org/quic/kernel/dwalker/linux-msm.git
S: Maintained
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 724038d..557738a 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -76,6 +76,14 @@ config GPIO_IT8761E
help
Say yes here to support GPIO functionality of IT8761E super I/O chip.
+config GPIO_MSM7200A
+ tristate "Qualcomm MSM7200A SoC GPIO support"
+ depends on GPIOLIB
+ help
+ Say yes here to support GPIO functionality on Qualcomm's
+ MSM chipsets which descend from the MSM7200a:
+ MSM7x01(a), MSM7x25, MSM7x27, MSM7x30, QSD8x50(a).
+
config GPIO_PL061
bool "PrimeCell PL061 GPIO support"
depends on ARM_AMBA
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 51c3cdd..2389c29 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_GPIO_MAX7301) += max7301.o
obj-$(CONFIG_GPIO_MAX732X) += max732x.o
obj-$(CONFIG_GPIO_MC33880) += mc33880.o
obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
+obj-$(CONFIG_GPIO_MSM7200A) += msm7200a-gpio.o
obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
obj-$(CONFIG_GPIO_PL061) += pl061.o
diff --git a/drivers/gpio/msm7200a-gpio.c b/drivers/gpio/msm7200a-gpio.c
new file mode 100644
index 0000000..22ae631
--- /dev/null
+++ b/drivers/gpio/msm7200a-gpio.c
@@ -0,0 +1,187 @@
+/*
+ * Driver for Qualcomm MSM7200a and related SoC GPIO.
+ * Supported chipset families include:
+ * MSM7x01(a), MSM7x25, MSM7x27, MSM7x30, QSD8x50(a)
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2010, Code Aurora Forum. 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 version 2 and
+ * only version 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; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+#include <linux/kernel.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/msm7200a-gpio.h>
+
+struct msm_gpio_dev {
+ struct gpio_chip gpio_chip;
+ spinlock_t lock;
+ struct msm7200a_gpio_regs regs;
+};
+
+static inline struct msm_gpio_dev *to_msm_gpio_dev(struct gpio_chip *chip)
+{
+ return container_of(chip, struct msm_gpio_dev, gpio_chip);
+}
+
+/*
+ * This function assumes that msm_gpio_dev::lock is held.
+ */
+static inline void set_gpio_bit(unsigned n, void __iomem *reg)
+{
+ writel(readl(reg) | BIT(n), reg);
+}
+
+/*
+ * This function assumes that msm_gpio_dev::lock is held.
+ */
+static inline void clr_gpio_bit(unsigned n, void __iomem *reg)
+{
+ writel(readl(reg) & ~BIT(n), reg);
+}
+
+/*
+ * This function assumes that msm_gpio_dev::lock is held.
+ */
+static inline void
+msm_gpio_write(struct msm_gpio_dev *dev, unsigned n, unsigned on)
+{
+ if (on)
+ set_gpio_bit(n, dev->regs.out);
+ else
+ clr_gpio_bit(n, dev->regs.out);
+}
+
+static int gpio_chip_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct msm_gpio_dev *msm_gpio = to_msm_gpio_dev(chip);
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&msm_gpio->lock, irq_flags);
+ clr_gpio_bit(offset, msm_gpio->regs.oe);
+ spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
+
+ return 0;
+}
+
+static int
+gpio_chip_direction_output(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct msm_gpio_dev *msm_gpio = to_msm_gpio_dev(chip);
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&msm_gpio->lock, irq_flags);
+ msm_gpio_write(msm_gpio, offset, value);
+ set_gpio_bit(offset, msm_gpio->regs.oe);
+ spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
+
+ return 0;
+}
+
+static int gpio_chip_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct msm_gpio_dev *msm_gpio = to_msm_gpio_dev(chip);
+
+ return readl(msm_gpio->regs.in) & BIT(offset) ? 1 : 0;
+}
+
+static void gpio_chip_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct msm_gpio_dev *msm_gpio = to_msm_gpio_dev(chip);
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&msm_gpio->lock, irq_flags);
+ msm_gpio_write(msm_gpio, offset, value);
+ spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
+}
+
+static int msm_gpio_probe(struct platform_device *dev)
+{
+ struct msm_gpio_dev *msm_gpio;
+ struct msm7200a_gpio_platform_data *pdata = dev->dev.platform_data;
+ int ret;
+
+ if (!pdata)
+ return -EINVAL;
+
+ msm_gpio = kzalloc(sizeof(struct msm_gpio_dev), GFP_KERNEL);
+ if (!msm_gpio)
+ return -ENOMEM;
+
+ spin_lock_init(&msm_gpio->lock);
+ platform_set_drvdata(dev, msm_gpio);
+
+ msm_gpio->regs = pdata->regs;
+ msm_gpio->gpio_chip.label = dev->name;
+ msm_gpio->gpio_chip.base = pdata->gpio_base;
+ msm_gpio->gpio_chip.ngpio = pdata->ngpio;
+ msm_gpio->gpio_chip.direction_input = gpio_chip_direction_input;
+ msm_gpio->gpio_chip.direction_output = gpio_chip_direction_output;
+ msm_gpio->gpio_chip.get = gpio_chip_get;
+ msm_gpio->gpio_chip.set = gpio_chip_set;
+
+ ret = gpiochip_add(&msm_gpio->gpio_chip);
+ if (ret < 0)
+ goto err_post_malloc;
+
+ return ret;
+err_post_malloc:
+ platform_set_drvdata(dev, NULL);
+ kfree(msm_gpio);
+ return ret;
+}
+
+static int msm_gpio_remove(struct platform_device *dev)
+{
+ struct msm_gpio_dev *msm_gpio = platform_get_drvdata(dev);
+ int ret = gpiochip_remove(&msm_gpio->gpio_chip);
+
+ if (ret < 0)
+ return ret;
+
+ kfree(msm_gpio);
+
+ return 0;
+}
+
+static struct platform_driver msm_gpio_driver = {
+ .probe = msm_gpio_probe,
+ .remove = msm_gpio_remove,
+ .driver = {
+ .name = "msm7200a-gpio",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init msm_gpio_init(void)
+{
+ return platform_driver_register(&msm_gpio_driver);
+}
+
+static void __exit msm_gpio_exit(void)
+{
+ platform_driver_unregister(&msm_gpio_driver);
+}
+
+postcore_initcall(msm_gpio_init);
+module_exit(msm_gpio_exit);
+
+MODULE_AUTHOR("Gregory Bean <gbean@...eaurora.org>");
+MODULE_DESCRIPTION("Driver for Qualcomm MSM 7200a-family SoC GPIOs");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:msm7200a-gpio");
diff --git a/include/linux/msm7200a-gpio.h b/include/linux/msm7200a-gpio.h
new file mode 100644
index 0000000..c44d16b
--- /dev/null
+++ b/include/linux/msm7200a-gpio.h
@@ -0,0 +1,62 @@
+/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of Code Aurora Forum, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef __LINUX_MSM7200A_GPIO_H
+#define __LINUX_MSM7200A_GPIO_H
+
+/**
+ * struct msm7200a_gpio_regs - addresess of iomapped GPIO registers
+ * @in: GPIO_IN_n
+ * @out: GPIO_OUT_n
+ * @oe: GPIO_OE_n
+ *
+ * Registers are not guaranteed to be packed in memory, or even
+ * located in a predictable pattern.
+ */
+struct msm7200a_gpio_regs {
+ void __iomem *in;
+ void __iomem *out;
+ void __iomem *oe;
+};
+
+/**
+ * struct msm7200a_gpio_platform_data - configuration for msm7200a-gpio
+ * @gpio_base: The first gpio to be assigned to the device. Corresponds
+ * directly to gpio_chip.base.
+ * @ngpio: The number of gpio lines to be managed by the device.
+ * Must be <= 32. Corresponds directly to gpio_chip.ngpio.
+ * @regs: Addresses of the registers which control the gpios
+ * to be managed by the device.
+ */
+struct msm7200a_gpio_platform_data {
+ unsigned gpio_base;
+ unsigned ngpio;
+ struct msm7200a_gpio_regs regs;
+};
+
+#endif
--
1.7.0.4
--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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