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Diffstat (limited to 'kernel/arch/m68k/coldfire/gpio.c')
-rw-r--r--kernel/arch/m68k/coldfire/gpio.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/kernel/arch/m68k/coldfire/gpio.c b/kernel/arch/m68k/coldfire/gpio.c
new file mode 100644
index 000000000..e7e428681
--- /dev/null
+++ b/kernel/arch/m68k/coldfire/gpio.c
@@ -0,0 +1,186 @@
+/*
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+
+#include <linux/io.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/mcfgpio.h>
+
+int __mcfgpio_get_value(unsigned gpio)
+{
+ return mcfgpio_read(__mcfgpio_ppdr(gpio)) & mcfgpio_bit(gpio);
+}
+EXPORT_SYMBOL(__mcfgpio_get_value);
+
+void __mcfgpio_set_value(unsigned gpio, int value)
+{
+ if (gpio < MCFGPIO_SCR_START) {
+ unsigned long flags;
+ MCFGPIO_PORTTYPE data;
+
+ local_irq_save(flags);
+ data = mcfgpio_read(__mcfgpio_podr(gpio));
+ if (value)
+ data |= mcfgpio_bit(gpio);
+ else
+ data &= ~mcfgpio_bit(gpio);
+ mcfgpio_write(data, __mcfgpio_podr(gpio));
+ local_irq_restore(flags);
+ } else {
+ if (value)
+ mcfgpio_write(mcfgpio_bit(gpio),
+ MCFGPIO_SETR_PORT(gpio));
+ else
+ mcfgpio_write(~mcfgpio_bit(gpio),
+ MCFGPIO_CLRR_PORT(gpio));
+ }
+}
+EXPORT_SYMBOL(__mcfgpio_set_value);
+
+int __mcfgpio_direction_input(unsigned gpio)
+{
+ unsigned long flags;
+ MCFGPIO_PORTTYPE dir;
+
+ local_irq_save(flags);
+ dir = mcfgpio_read(__mcfgpio_pddr(gpio));
+ dir &= ~mcfgpio_bit(gpio);
+ mcfgpio_write(dir, __mcfgpio_pddr(gpio));
+ local_irq_restore(flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(__mcfgpio_direction_input);
+
+int __mcfgpio_direction_output(unsigned gpio, int value)
+{
+ unsigned long flags;
+ MCFGPIO_PORTTYPE data;
+
+ local_irq_save(flags);
+ data = mcfgpio_read(__mcfgpio_pddr(gpio));
+ data |= mcfgpio_bit(gpio);
+ mcfgpio_write(data, __mcfgpio_pddr(gpio));
+
+ /* now set the data to output */
+ if (gpio < MCFGPIO_SCR_START) {
+ data = mcfgpio_read(__mcfgpio_podr(gpio));
+ if (value)
+ data |= mcfgpio_bit(gpio);
+ else
+ data &= ~mcfgpio_bit(gpio);
+ mcfgpio_write(data, __mcfgpio_podr(gpio));
+ } else {
+ if (value)
+ mcfgpio_write(mcfgpio_bit(gpio),
+ MCFGPIO_SETR_PORT(gpio));
+ else
+ mcfgpio_write(~mcfgpio_bit(gpio),
+ MCFGPIO_CLRR_PORT(gpio));
+ }
+ local_irq_restore(flags);
+ return 0;
+}
+EXPORT_SYMBOL(__mcfgpio_direction_output);
+
+int __mcfgpio_request(unsigned gpio)
+{
+ return 0;
+}
+EXPORT_SYMBOL(__mcfgpio_request);
+
+void __mcfgpio_free(unsigned gpio)
+{
+ __mcfgpio_direction_input(gpio);
+}
+EXPORT_SYMBOL(__mcfgpio_free);
+
+#ifdef CONFIG_GPIOLIB
+
+static int mcfgpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ return __mcfgpio_direction_input(offset);
+}
+
+static int mcfgpio_get_value(struct gpio_chip *chip, unsigned offset)
+{
+ return __mcfgpio_get_value(offset);
+}
+
+static int mcfgpio_direction_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ return __mcfgpio_direction_output(offset, value);
+}
+
+static void mcfgpio_set_value(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ __mcfgpio_set_value(offset, value);
+}
+
+static int mcfgpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ return __mcfgpio_request(offset);
+}
+
+static void mcfgpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ __mcfgpio_free(offset);
+}
+
+static int mcfgpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+#if defined(MCFGPIO_IRQ_MIN)
+ if ((offset >= MCFGPIO_IRQ_MIN) && (offset < MCFGPIO_IRQ_MAX))
+#else
+ if (offset < MCFGPIO_IRQ_MAX)
+#endif
+ return MCFGPIO_IRQ_VECBASE + offset;
+ else
+ return -EINVAL;
+}
+
+static struct bus_type mcfgpio_subsys = {
+ .name = "gpio",
+ .dev_name = "gpio",
+};
+
+static struct gpio_chip mcfgpio_chip = {
+ .label = "mcfgpio",
+ .request = mcfgpio_request,
+ .free = mcfgpio_free,
+ .direction_input = mcfgpio_direction_input,
+ .direction_output = mcfgpio_direction_output,
+ .get = mcfgpio_get_value,
+ .set = mcfgpio_set_value,
+ .to_irq = mcfgpio_to_irq,
+ .base = 0,
+ .ngpio = MCFGPIO_PIN_MAX,
+};
+
+static int __init mcfgpio_sysinit(void)
+{
+ gpiochip_add(&mcfgpio_chip);
+ return subsys_system_register(&mcfgpio_subsys, NULL);
+}
+
+core_initcall(mcfgpio_sysinit);
+#endif