core generic GPIO support for Freescale Coldfire processors.

This adds the basic infrastructure used by all of the different Coldfire CPUs.

Signed-off-by: Steven King <sfking@fdwdc.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

4 files changed, 162 insertions, 0 deletions

diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 534376299a99..e2201b90aa22 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -47,6 +47,10 @@ config GENERIC_FIND_NEXT_BIT
         bool
         default y
 
+config GENERIC_GPIO
+        bool
+        default n
+
 config GENERIC_HWEIGHT
         bool
         default y
@@ -182,6 +186,8 @@ config M527x
 config COLDFIRE
         bool
         depends on (M5206 || M5206e || M520x || M523x || M5249 || M527x || M5272 || M528x || M5307 || M532x || M5407)
+        select GENERIC_GPIO
+        select ARCH_REQUIRE_GPIOLIB
         default y
 
 config CLOCK_SET
diff --git a/arch/m68knommu/platform/coldfire/Makefile b/arch/m68knommu/platform/coldfire/Makefile
index 1bcb9372353f..2667323c7fee 100644
--- a/arch/m68knommu/platform/coldfire/Makefile
+++ b/arch/m68knommu/platform/coldfire/Makefile
@@ -27,4 +27,5 @@ obj-$(CONFIG_M5307)	+= timers.o
 obj-$(CONFIG_M532x)     += timers.o
 obj-$(CONFIG_M5407)     += timers.o
 
+obj-y                   += pinmux.o gpio.o
 extra-y := head.o
diff --git a/arch/m68knommu/platform/coldfire/gpio.c b/arch/m68knommu/platform/coldfire/gpio.c
new file mode 100644
index 000000000000..ff0045793450
--- /dev/null
+++ b/arch/m68knommu/platform/coldfire/gpio.c
@@ -0,0 +1,127 @@
+/*
+ * Coldfire generic GPIO support.
+ *
+ * (C) Copyright 2009, Steven King <sfking@fdwdc.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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sysdev.h>
+
+#include <asm/gpio.h>
+#include <asm/pinmux.h>
+#include <asm/mcfgpio.h>
+
+#define MCF_CHIP(chip) container_of(chip, struct mcf_gpio_chip, gpio_chip)
+
+int mcf_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+        unsigned long flags;
+        MCFGPIO_PORTTYPE dir;
+        struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
+
+        local_irq_save(flags);
+        dir = mcfgpio_read(mcf_chip->pddr);
+        dir &= ~mcfgpio_bit(chip->base + offset);
+        mcfgpio_write(dir, mcf_chip->pddr);
+        local_irq_restore(flags);
+
+        return 0;
+}
+
+int mcf_gpio_get_value(struct gpio_chip *chip, unsigned offset)
+{
+        struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
+
+        return mcfgpio_read(mcf_chip->ppdr) & mcfgpio_bit(chip->base + offset);
+}
+
+int mcf_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
+                int value)
+{
+        unsigned long flags;
+        MCFGPIO_PORTTYPE data;
+        struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
+
+        local_irq_save(flags);
+        /* write the value to the output latch */
+        data = mcfgpio_read(mcf_chip->podr);
+        if (value)
+                data |= mcfgpio_bit(chip->base + offset);
+        else
+                data &= ~mcfgpio_bit(chip->base + offset);
+        mcfgpio_write(data, mcf_chip->podr);
+
+        /* now set the direction to output */
+        data = mcfgpio_read(mcf_chip->pddr);
+        data |= mcfgpio_bit(chip->base + offset);
+        mcfgpio_write(data, mcf_chip->pddr);
+        local_irq_restore(flags);
+
+        return 0;
+}
+
+void mcf_gpio_set_value(struct gpio_chip *chip, unsigned offset, int value)
+{
+        struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
+
+        unsigned long flags;
+        MCFGPIO_PORTTYPE data;
+
+        local_irq_save(flags);
+        data = mcfgpio_read(mcf_chip->podr);
+        if (value)
+                data |= mcfgpio_bit(chip->base + offset);
+        else
+                data &= ~mcfgpio_bit(chip->base + offset);
+        mcfgpio_write(data, mcf_chip->podr);
+        local_irq_restore(flags);
+}
+
+void mcf_gpio_set_value_fast(struct gpio_chip *chip, unsigned offset, int value)
+{
+        struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
+
+        if (value)
+                mcfgpio_write(mcfgpio_bit(chip->base + offset), mcf_chip->setr);
+        else
+                mcfgpio_write(~mcfgpio_bit(chip->base + offset), mcf_chip->clrr);
+}
+
+int mcf_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+        struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
+
+        return mcf_chip->gpio_to_pinmux ?
+                mcf_pinmux_request(mcf_chip->gpio_to_pinmux[offset], 0) : 0;
+}
+
+void mcf_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+        struct mcf_gpio_chip *mcf_chip = MCF_CHIP(chip);
+
+        mcf_gpio_direction_input(chip, offset);
+
+        if (mcf_chip->gpio_to_pinmux)
+                mcf_pinmux_release(mcf_chip->gpio_to_pinmux[offset], 0);
+}
+
+struct sysdev_class mcf_gpio_sysclass = {
+        .name   = "gpio",
+};
+
+static int __init mcf_gpio_sysinit(void)
+{
+        return sysdev_class_register(&mcf_gpio_sysclass);
+}
+
+core_initcall(mcf_gpio_sysinit);
diff --git a/arch/m68knommu/platform/coldfire/pinmux.c b/arch/m68knommu/platform/coldfire/pinmux.c
new file mode 100644
index 000000000000..8c62b825939f
--- /dev/null
+++ b/arch/m68knommu/platform/coldfire/pinmux.c
@@ -0,0 +1,28 @@
+/*
+ * Coldfire generic GPIO pinmux support.
+ *
+ * (C) Copyright 2009, Steven King <sfking@fdwdc.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; version 2 of the License.
+ *
+ *   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.
+ *
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/pinmux.h>
+
+int mcf_pinmux_request(unsigned pinmux, unsigned func)
+{
+        return 0;
+}
+
+void mcf_pinmux_release(unsigned pinmux, unsigned func)
+{
+}