[PATCH v4] powerpc: gpio driver for mpc8349/8572/8610 and compatible
Peter Korsgaard
jacmet at sunsite.dk
Tue Sep 23 00:59:42 EST 2008
Structured similar to the existing QE GPIO support.
Signed-off-by: Peter Korsgaard <jacmet at sunsite.dk>
---
Changes since v3:
- Incorporated feedback from Anton
Changes since v2:
- Clarified documentation as requested by Kumar.
Changes since v1:
Incorporated feedback from Anton and Kumar:
- Core is also used on 8572/8610 so s/83xx/8xxx/
- Use fsl,mpc8572-gpio / fsl,mpc8610-gpio for 85xx/86xx as compatible
- Use shadowed data register to handle open drain outputs
- Expandend dts binding doc, use 8347 as example instead of 8349
- Misc small cleanups
.../powerpc/dts-bindings/fsl/8xxx_gpio.txt | 40 +++++
arch/powerpc/sysdev/Kconfig | 9 +
arch/powerpc/sysdev/Makefile | 1 +
arch/powerpc/sysdev/mpc8xxx_gpio.c | 171 ++++++++++++++++++++
4 files changed, 221 insertions(+), 0 deletions(-)
create mode 100644 Documentation/powerpc/dts-bindings/fsl/8xxx_gpio.txt
create mode 100644 arch/powerpc/sysdev/mpc8xxx_gpio.c
diff --git a/Documentation/powerpc/dts-bindings/fsl/8xxx_gpio.txt b/Documentation/powerpc/dts-bindings/fsl/8xxx_gpio.txt
new file mode 100644
index 0000000..d015dce
--- /dev/null
+++ b/Documentation/powerpc/dts-bindings/fsl/8xxx_gpio.txt
@@ -0,0 +1,40 @@
+GPIO controllers on MPC8xxx SoCs
+
+This is for the non-QE/CPM/GUTs GPIO controllers as found on
+8349, 8572, 8610 and compatible.
+
+Every GPIO controller node must have #gpio-cells property defined,
+this information will be used to translate gpio-specifiers.
+
+Required properties:
+- compatible : "fsl,<CHIP>-gpio" followed by "fsl,mpc8349-gpio" for
+ 83xx, "fsl,mpc8572-gpio" for 85xx and "fsl,mpc8610-gpio" for 86xx.
+- #gpio-cells : Should be two. The first cell is the pin number and the
+ second cell is used to specify optional parameters (currently unused).
+ - interrupts : Interrupt mapping for GPIO IRQ (currently unused).
+ - interrupt-parent : Phandle for the interrupt controller that
+ services interrupts for this device.
+- gpio-controller : Marks the port as GPIO controller.
+
+Example of gpio-controller nodes for a MPC8347 SoC:
+
+ gpio1: gpio-controller at c00 {
+ #gpio-cells = <2>;
+ compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
+ reg = <0xc00 0x100>;
+ interrupts = <74 0x8>;
+ interrupt-parent = <&ipic>;
+ gpio-controller;
+ };
+
+ gpio2: gpio-controller at d00 {
+ #gpio-cells = <2>;
+ compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
+ reg = <0xd00 0x100>;
+ interrupts = <75 0x8>;
+ interrupt-parent = <&ipic>;
+ gpio-controller;
+ };
+
+See booting-without-of.txt for details of how to specify GPIO
+information for devices.
diff --git a/arch/powerpc/sysdev/Kconfig b/arch/powerpc/sysdev/Kconfig
index 72fb35b..a11cc8f 100644
--- a/arch/powerpc/sysdev/Kconfig
+++ b/arch/powerpc/sysdev/Kconfig
@@ -6,3 +6,12 @@ config PPC4xx_PCI_EXPRESS
bool
depends on PCI && 4xx
default n
+
+config MPC8xxx_GPIO
+ bool "MPC8xxx GPIO support"
+ depends on PPC_MPC831x || PPC_MPC834x || PPC_MPC837x || PPC_85xx || PPC_86xx
+ select GENERIC_GPIO
+ select ARCH_REQUIRE_GPIOLIB
+ help
+ Say Y here if you're going to use hardware that connects to the
+ MPC831x/834x/837x/8572/8610 GPIOs.
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index a90054b..e410764 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_FSL_SOC) += fsl_soc.o
obj-$(CONFIG_FSL_PCI) += fsl_pci.o $(fsl-msi-obj-y)
obj-$(CONFIG_FSL_LBC) += fsl_lbc.o
obj-$(CONFIG_FSL_GTM) += fsl_gtm.o
+obj-$(CONFIG_MPC8xxx_GPIO) += mpc8xxx_gpio.o
obj-$(CONFIG_RAPIDIO) += fsl_rio.o
obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o
obj-$(CONFIG_QUICC_ENGINE) += qe_lib/
diff --git a/arch/powerpc/sysdev/mpc8xxx_gpio.c b/arch/powerpc/sysdev/mpc8xxx_gpio.c
new file mode 100644
index 0000000..103eace
--- /dev/null
+++ b/arch/powerpc/sysdev/mpc8xxx_gpio.c
@@ -0,0 +1,171 @@
+/*
+ * GPIOs on MPC8349/8572/8610 and compatible
+ *
+ * Copyright (C) 2008 Peter Korsgaard <jacmet at sunsite.dk>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+
+#define MPC8XXX_GPIO_PINS 32
+
+#define GPIO_DIR 0x00
+#define GPIO_ODR 0x04
+#define GPIO_DAT 0x08
+#define GPIO_IER 0x0c
+#define GPIO_IMR 0x10
+#define GPIO_ICR 0x14
+
+struct mpc8xxx_gpio_chip {
+ struct of_mm_gpio_chip mm_gc;
+ spinlock_t lock;
+
+ /*
+ * shadowed data register to be able to clear/set output pins in
+ * open drain mode safely
+ */
+ u32 data;
+};
+
+static inline u32 mpc8xxx_gpio2mask(unsigned int gpio)
+{
+ return 1u << (MPC8XXX_GPIO_PINS - 1 - gpio);
+}
+
+static inline struct mpc8xxx_gpio_chip *
+to_mpc8xxx_gpio_chip(struct of_mm_gpio_chip *mm)
+{
+ return container_of(mm, struct mpc8xxx_gpio_chip, mm_gc);
+}
+
+static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm)
+{
+ struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+
+ mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT);
+}
+
+static int mpc8xxx_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+
+ return in_be32(mm->regs + GPIO_DAT) & mpc8xxx_gpio2mask(gpio);
+}
+
+static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+ struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+ unsigned long flags;
+
+ spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+ if (val)
+ mpc8xxx_gc->data |= mpc8xxx_gpio2mask(gpio);
+ else
+ mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(gpio);
+
+ out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data);
+
+ spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+}
+
+static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+ struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+ unsigned long flags;
+
+ spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+ clrbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
+
+ spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+
+ return 0;
+}
+
+static int mpc8xxx_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+ struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+ unsigned long flags;
+
+ mpc8xxx_gpio_set(gc, gpio, val);
+
+ spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+ setbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio));
+
+ spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+
+ return 0;
+}
+
+static void __init mpc8xxx_add_controller(struct device_node *np)
+{
+ struct mpc8xxx_gpio_chip *mpc8xxx_gc;
+ struct of_mm_gpio_chip *mm_gc;
+ struct of_gpio_chip *of_gc;
+ struct gpio_chip *gc;
+ int ret;
+
+ mpc8xxx_gc = kzalloc(sizeof(*mpc8xxx_gc), GFP_KERNEL);
+ if (!mpc8xxx_gc) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ spin_lock_init(&mpc8xxx_gc->lock);
+
+ mm_gc = &mpc8xxx_gc->mm_gc;
+ of_gc = &mm_gc->of_gc;
+ gc = &of_gc->gc;
+
+ mm_gc->save_regs = mpc8xxx_gpio_save_regs;
+ of_gc->gpio_cells = 2;
+ gc->ngpio = MPC8XXX_GPIO_PINS;
+ gc->direction_input = mpc8xxx_gpio_dir_in;
+ gc->direction_output = mpc8xxx_gpio_dir_out;
+ gc->get = mpc8xxx_gpio_get;
+ gc->set = mpc8xxx_gpio_set;
+
+ ret = of_mm_gpiochip_add(np, mm_gc);
+ if (ret)
+ goto err;
+
+ return;
+
+err:
+ pr_err("%s: registration failed with status %d\n",
+ np->full_name, ret);
+ kfree(mpc8xxx_gc);
+
+ return;
+}
+
+static int __init mpc8xxx_add_gpiochips(void)
+{
+ struct device_node *np;
+
+ for_each_compatible_node(np, NULL, "fsl,mpc8349-gpio")
+ mpc8xxx_add_controller(np);
+
+ for_each_compatible_node(np, NULL, "fsl,mpc8572-gpio")
+ mpc8xxx_add_controller(np);
+
+ for_each_compatible_node(np, NULL, "fsl,mpc8610-gpio")
+ mpc8xxx_add_controller(np);
+
+ return 0;
+}
+arch_initcall(mpc8xxx_add_gpiochips);
--
1.5.6.3
More information about the Linuxppc-dev
mailing list