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authorsfking@fdwdc.com <sfking@fdwdc.com>2009-06-19 18:11:00 -0700
committerGreg Ungerer <gerg@uclinux.org>2009-09-10 12:01:22 +1000
commitaf39bb8b07af83b579c90c09ba3943123cdb4132 (patch)
tree8c1965a7a7d6ba09344549410e3ee476af8ffb1d /arch/m68knommu/platform/coldfire
parent74fca6a42863ffacaf7ba6f1936a9f228950f657 (diff)
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>
Diffstat (limited to 'arch/m68knommu/platform/coldfire')
-rw-r--r--arch/m68knommu/platform/coldfire/Makefile1
-rw-r--r--arch/m68knommu/platform/coldfire/gpio.c127
-rw-r--r--arch/m68knommu/platform/coldfire/pinmux.c28
3 files changed, 156 insertions, 0 deletions
diff --git a/arch/m68knommu/platform/coldfire/Makefile b/arch/m68knommu/platform/coldfire/Makefile
index 1bcb9372353..2667323c7fe 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 00000000000..ff004579345
--- /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 00000000000..8c62b825939
--- /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)
+{
+}