[PATCH v2] powerpc: implement support for MPC8349-compatible SOC GPIOs
Anton Vorontsov
avorontsov at ru.mvista.com
Thu Sep 18 03:58:20 EST 2008
This patch implements GPIOLIB support for MPC8349-compatible SOC GPIOs.
MPC8610 adopted this GPIO unit, so let's place it into sysdev.
We'll need these gpios to support IrDA transceiver on MPC8610HPCD.
Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
---
v2:
- Incorporated Peter Korsgaard's suggestion regarding order
of setting data/direction registers.
The patch applies on top of "powerpc: add driver for simple GPIO banks".
arch/powerpc/sysdev/Kconfig | 10 ++
arch/powerpc/sysdev/Makefile | 1 +
arch/powerpc/sysdev/fsl_mpc8349_gpio.c | 161 ++++++++++++++++++++++++++++++++
3 files changed, 172 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/sysdev/fsl_mpc8349_gpio.c
diff --git a/arch/powerpc/sysdev/Kconfig b/arch/powerpc/sysdev/Kconfig
index 30d6e4d..4cbfda0 100644
--- a/arch/powerpc/sysdev/Kconfig
+++ b/arch/powerpc/sysdev/Kconfig
@@ -17,3 +17,13 @@ config OF_SIMPLE_GPIO
These are usually BCSRs used to control board's switches, LEDs,
chip-selects, Ethernet/USB PHY's power and various other small
on-board peripherals.
+
+config FSL_MPC8349_GPIO
+ bool "Support for MPC8349-compatible GPIO controllers"
+ depends on PPC32
+ select GENERIC_GPIO
+ select ARCH_REQUIRE_GPIOLIB
+ help
+ Say Y here to support Freescale MPC8349-compatible GPIO controllers.
+ The controllers can be found in MPC831x, MPC834x, MPC837x and
+ MPC8610 processors.
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index 239d7e8..afbc3a4 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_4xx) += ppc4xx_pci.o
endif
obj-$(CONFIG_OF_SIMPLE_GPIO) += of_simple_gpio.o
+obj-$(CONFIG_FSL_MPC8349_GPIO) += fsl_mpc8349_gpio.o
# Temporary hack until we have migrated to asm-powerpc
ifeq ($(ARCH),powerpc)
diff --git a/arch/powerpc/sysdev/fsl_mpc8349_gpio.c b/arch/powerpc/sysdev/fsl_mpc8349_gpio.c
new file mode 100644
index 0000000..c8c77f4
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_mpc8349_gpio.c
@@ -0,0 +1,161 @@
+/*
+ * MPC8349-compatible SOC GPIOs
+ *
+ * Copyright (c) MontaVista Software, Inc. 2008.
+ *
+ * Author: Anton Vorontsov <avorontsov at ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+
+#define FSL_GPIO_PINS 32
+
+struct fsl_gpio_regs {
+ __be32 gpdir;
+ __be32 gpodr;
+ __be32 gpdat;
+ __be32 gpier;
+ __be32 gpimr;
+ __be32 gpicr;
+};
+
+struct fsl_gpio_chip {
+ struct of_mm_gpio_chip mm_gc;
+ spinlock_t lock;
+
+ /* shadowed data register to clear/set bits safely */
+ u32 gpdat;
+};
+
+static inline u32 pin2mask(unsigned int pin)
+{
+ return 1 << (FSL_GPIO_PINS - 1 - pin);
+}
+
+static inline struct fsl_gpio_chip *
+to_fsl_gpio_chip(struct of_mm_gpio_chip *mm_gc)
+{
+ return container_of(mm_gc, struct fsl_gpio_chip, mm_gc);
+}
+
+static void fsl_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
+{
+ struct fsl_gpio_chip *fsl_gc = to_fsl_gpio_chip(mm_gc);
+ struct fsl_gpio_regs __iomem *regs = mm_gc->regs;
+
+ fsl_gc->gpdat = in_be32(®s->gpdat);
+}
+
+static int fsl_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct fsl_gpio_regs __iomem *regs = mm_gc->regs;
+
+ return in_be32(®s->gpdat) & pin2mask(gpio);
+}
+
+static void fsl_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct fsl_gpio_chip *fsl_gc = to_fsl_gpio_chip(mm_gc);
+ struct fsl_gpio_regs __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&fsl_gc->lock, flags);
+
+ if (val)
+ fsl_gc->gpdat |= pin2mask(gpio);
+ else
+ fsl_gc->gpdat &= ~pin2mask(gpio);
+
+ out_be32(®s->gpdat, fsl_gc->gpdat);
+
+ spin_unlock_irqrestore(&fsl_gc->lock, flags);
+}
+
+static int fsl_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct fsl_gpio_chip *fsl_gc = to_fsl_gpio_chip(mm_gc);
+ struct fsl_gpio_regs __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ spin_lock_irqsave(&fsl_gc->lock, flags);
+ clrbits32(®s->gpdir, pin2mask(gpio));
+ spin_unlock_irqrestore(&fsl_gc->lock, flags);
+ return 0;
+}
+
+static int fsl_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
+ struct fsl_gpio_chip *fsl_gc = to_fsl_gpio_chip(mm_gc);
+ struct fsl_gpio_regs __iomem *regs = mm_gc->regs;
+ unsigned long flags;
+
+ fsl_gpio_set(gc, gpio, val);
+
+ spin_lock_irqsave(&fsl_gc->lock, flags);
+ setbits32(®s->gpdir, pin2mask(gpio));
+ spin_unlock_irqrestore(&fsl_gc->lock, flags);
+ return 0;
+}
+
+static int __init fsl_gpio_init(void)
+{
+ struct device_node *np;
+
+ for_each_compatible_node(np, NULL, "fsl,mpc8349-gpio-bank") {
+ int ret;
+ struct fsl_gpio_chip *fsl_gc;
+ struct of_mm_gpio_chip *mm_gc;
+ struct of_gpio_chip *of_gc;
+ struct gpio_chip *gc;
+
+ fsl_gc = kzalloc(sizeof(*fsl_gc), GFP_KERNEL);
+ if (!fsl_gc) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ spin_lock_init(&fsl_gc->lock);
+
+ mm_gc = &fsl_gc->mm_gc;
+ of_gc = &mm_gc->of_gc;
+ gc = &of_gc->gc;
+
+ mm_gc->save_regs = fsl_gpio_save_regs;
+ of_gc->gpio_cells = 2;
+ gc->ngpio = FSL_GPIO_PINS;
+ gc->direction_input = fsl_gpio_dir_in;
+ gc->direction_output = fsl_gpio_dir_out;
+ gc->get = fsl_gpio_get;
+ gc->set = fsl_gpio_set;
+
+ ret = of_mm_gpiochip_add(np, mm_gc);
+ if (ret)
+ goto err;
+ continue;
+err:
+ pr_err("%s: registration failed with status %d\n",
+ np->full_name, ret);
+ kfree(fsl_gc);
+ /* try others anyway */
+ }
+ return 0;
+}
+arch_initcall(fsl_gpio_init);
--
1.5.6.3
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