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-rw-r--r--arch/arm/Kconfig1
-rw-r--r--arch/arm/mach-ep93xx/Makefile2
-rw-r--r--arch/arm/mach-ep93xx/core.c109
-rw-r--r--arch/arm/mach-ep93xx/gpio.c158
-rw-r--r--include/asm-arm/arch-ep93xx/gpio.h21
5 files changed, 176 insertions, 115 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4039a13..a583c0b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -255,6 +255,7 @@ config ARCH_EP93XX
select ARM_AMBA
select ARM_VIC
select GENERIC_GPIO
+ select HAVE_GPIO_LIB
help
This enables support for the Cirrus EP93xx series of CPUs.
diff --git a/arch/arm/mach-ep93xx/Makefile b/arch/arm/mach-ep93xx/Makefile
index 0ecf997..c1252ca 100644
--- a/arch/arm/mach-ep93xx/Makefile
+++ b/arch/arm/mach-ep93xx/Makefile
@@ -1,7 +1,7 @@
#
# Makefile for the linux kernel.
#
-obj-y := core.o clock.o
+obj-y := core.o clock.o gpio.o
obj-m :=
obj-n :=
obj- :=
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 91f6a07..8bc1872 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -159,7 +159,7 @@ static const u8 int_type2_register_offset[3] = { 0x94, 0xb0, 0x50 };
static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 };
static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x5c };
-static void update_gpio_int_params(unsigned port)
+void ep93xx_gpio_update_int_params(unsigned port)
{
BUG_ON(port > 2);
@@ -175,98 +175,10 @@ static void update_gpio_int_params(unsigned port)
EP93XX_GPIO_REG(int_en_register_offset[port]));
}
-/* Port ordering is: A B F D E C G H */
-static const u8 data_register_offset[8] = {
- 0x00, 0x04, 0x30, 0x0c, 0x20, 0x08, 0x38, 0x40,
-};
-
-static const u8 data_direction_register_offset[8] = {
- 0x10, 0x14, 0x34, 0x1c, 0x24, 0x18, 0x3c, 0x44,
-};
-
-#define GPIO_IN 0
-#define GPIO_OUT 1
-
-static void ep93xx_gpio_set_direction(unsigned line, int direction)
-{
- unsigned int data_direction_register;
- unsigned long flags;
- unsigned char v;
-
- data_direction_register =
- EP93XX_GPIO_REG(data_direction_register_offset[line >> 3]);
-
- local_irq_save(flags);
- if (direction == GPIO_OUT) {
- if (line >= 0 && line <= EP93XX_GPIO_LINE_MAX_IRQ) {
- /* Port A/B/F */
- gpio_int_unmasked[line >> 3] &= ~(1 << (line & 7));
- update_gpio_int_params(line >> 3);
- }
-
- v = __raw_readb(data_direction_register);
- v |= 1 << (line & 7);
- __raw_writeb(v, data_direction_register);
- } else if (direction == GPIO_IN) {
- v = __raw_readb(data_direction_register);
- v &= ~(1 << (line & 7));
- __raw_writeb(v, data_direction_register);
- }
- local_irq_restore(flags);
-}
-
-int gpio_direction_input(unsigned gpio)
-{
- if (gpio > EP93XX_GPIO_LINE_MAX)
- return -EINVAL;
-
- ep93xx_gpio_set_direction(gpio, GPIO_IN);
-
- return 0;
-}
-EXPORT_SYMBOL(gpio_direction_input);
-
-int gpio_direction_output(unsigned gpio, int value)
-{
- if (gpio > EP93XX_GPIO_LINE_MAX)
- return -EINVAL;
-
- gpio_set_value(gpio, value);
- ep93xx_gpio_set_direction(gpio, GPIO_OUT);
-
- return 0;
-}
-EXPORT_SYMBOL(gpio_direction_output);
-
-int gpio_get_value(unsigned gpio)
-{
- unsigned int data_register;
-
- data_register = EP93XX_GPIO_REG(data_register_offset[gpio >> 3]);
-
- return !!(__raw_readb(data_register) & (1 << (gpio & 7)));
-}
-EXPORT_SYMBOL(gpio_get_value);
-
-void gpio_set_value(unsigned gpio, int value)
+void ep93xx_gpio_int_mask(unsigned line)
{
- unsigned int data_register;
- unsigned long flags;
- unsigned char v;
-
- data_register = EP93XX_GPIO_REG(data_register_offset[gpio >> 3]);
-
- local_irq_save(flags);
- v = __raw_readb(data_register);
- if (value)
- v |= 1 << (gpio & 7);
- else
- v &= ~(1 << (gpio & 7));
- __raw_writeb(v, data_register);
- local_irq_restore(flags);
+ gpio_int_unmasked[line >> 3] &= ~(1 << (line & 7));
}
-EXPORT_SYMBOL(gpio_set_value);
-
/*************************************************************************
* EP93xx IRQ handling
@@ -316,7 +228,7 @@ static void ep93xx_gpio_irq_ack(unsigned int irq)
if ((irq_desc[irq].status & IRQ_TYPE_SENSE_MASK) == IRQT_BOTHEDGE) {
gpio_int_type2[port] ^= port_mask; /* switch edge direction */
- update_gpio_int_params(port);
+ ep93xx_gpio_update_int_params(port);
}
__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
@@ -332,7 +244,7 @@ static void ep93xx_gpio_irq_mask_ack(unsigned int irq)
gpio_int_type2[port] ^= port_mask; /* switch edge direction */
gpio_int_unmasked[port] &= ~port_mask;
- update_gpio_int_params(port);
+ ep93xx_gpio_update_int_params(port);
__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
}
@@ -343,7 +255,7 @@ static void ep93xx_gpio_irq_mask(unsigned int irq)
int port = line >> 3;
gpio_int_unmasked[port] &= ~(1 << (line & 7));
- update_gpio_int_params(port);
+ ep93xx_gpio_update_int_params(port);
}
static void ep93xx_gpio_irq_unmask(unsigned int irq)
@@ -352,7 +264,7 @@ static void ep93xx_gpio_irq_unmask(unsigned int irq)
int port = line >> 3;
gpio_int_unmasked[port] |= 1 << (line & 7);
- update_gpio_int_params(port);
+ ep93xx_gpio_update_int_params(port);
}
@@ -368,7 +280,7 @@ static int ep93xx_gpio_irq_type(unsigned int irq, unsigned int type)
const int port = gpio >> 3;
const int port_mask = 1 << (gpio & 7);
- ep93xx_gpio_set_direction(gpio, GPIO_IN);
+ gpio_direction_output(gpio, gpio_get_value(gpio));
switch (type) {
case IRQT_RISING:
@@ -411,7 +323,7 @@ static int ep93xx_gpio_irq_type(unsigned int irq, unsigned int type)
desc->status &= ~IRQ_TYPE_SENSE_MASK;
desc->status |= type & IRQ_TYPE_SENSE_MASK;
- update_gpio_int_params(port);
+ ep93xx_gpio_update_int_params(port);
return 0;
}
@@ -549,6 +461,7 @@ static struct platform_device ep93xx_ohci_device = {
.resource = ep93xx_ohci_resources,
};
+extern void ep93xx_gpio_init(void);
void __init ep93xx_init_devices(void)
{
@@ -562,6 +475,8 @@ void __init ep93xx_init_devices(void)
__raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
__raw_writel(v, EP93XX_SYSCON_DEVICE_CONFIG);
+ ep93xx_gpio_init();
+
amba_device_register(&uart1_device, &iomem_resource);
amba_device_register(&uart2_device, &iomem_resource);
amba_device_register(&uart3_device, &iomem_resource);
diff --git a/arch/arm/mach-ep93xx/gpio.c b/arch/arm/mach-ep93xx/gpio.c
new file mode 100644
index 0000000..dc2e4c0
--- /dev/null
+++ b/arch/arm/mach-ep93xx/gpio.c
@@ -0,0 +1,158 @@
+/*
+ * linux/arch/arm/mach-ep93xx/gpio.c
+ *
+ * Generic EP93xx GPIO handling
+ *
+ * Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
+ *
+ * Based on code originally from:
+ * linux/arch/arm/mach-ep93xx/core.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+
+#include <asm/arch/ep93xx-regs.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+struct ep93xx_gpio_chip {
+ struct gpio_chip chip;
+
+ unsigned int data_reg;
+ unsigned int data_dir_reg;
+};
+
+#define to_ep93xx_gpio_chip(c) container_of(c, struct ep93xx_gpio_chip, chip)
+
+/* From core.c */
+extern void ep93xx_gpio_int_mask(unsigned line);
+extern void ep93xx_gpio_update_int_params(unsigned port);
+
+static int ep93xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
+ unsigned long flags;
+ u8 v;
+
+ local_irq_save(flags);
+ v = __raw_readb(ep93xx_chip->data_dir_reg);
+ v &= ~(1 << offset);
+ __raw_writeb(v, ep93xx_chip->data_dir_reg);
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+static int ep93xx_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int val)
+{
+ struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
+ unsigned long flags;
+ int line;
+ u8 v;
+
+ local_irq_save(flags);
+
+ /* Set the value */
+ v = __raw_readb(ep93xx_chip->data_reg);
+ if (val)
+ v |= (1 << offset);
+ else
+ v &= ~(1 << offset);
+ __raw_writeb(v, ep93xx_chip->data_reg);
+
+ /* Drive as an output */
+ line = chip->base + offset;
+ if (line <= EP93XX_GPIO_LINE_MAX_IRQ) {
+ /* Ports A/B/F */
+ ep93xx_gpio_int_mask(line);
+ ep93xx_gpio_update_int_params(line >> 3);
+ }
+
+ v = __raw_readb(ep93xx_chip->data_dir_reg);
+ v |= (1 << offset);
+ __raw_writeb(v, ep93xx_chip->data_dir_reg);
+
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+static int ep93xx_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
+
+ return !!(__raw_readb(ep93xx_chip->data_reg) & (1 << offset));
+}
+
+static void ep93xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+ struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
+ unsigned long flags;
+ u8 v;
+
+ local_irq_save(flags);
+ v = __raw_readb(ep93xx_chip->data_reg);
+ if (val)
+ v |= (1 << offset);
+ else
+ v &= ~(1 << offset);
+ __raw_writeb(v, ep93xx_chip->data_reg);
+ local_irq_restore(flags);
+}
+
+static void ep93xx_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
+ u8 data_reg, data_dir_reg;
+ int i;
+
+ data_reg = __raw_readb(ep93xx_chip->data_reg);
+ data_dir_reg = __raw_readb(ep93xx_chip->data_dir_reg);
+
+ for (i = 0; i < chip->ngpio; i++)
+ seq_printf(s, "GPIO %s%d: %s %s\n", chip->label, i,
+ (data_reg & (1 << i)) ? "set" : "clear",
+ (data_dir_reg & (1 << i)) ? "out" : "in");
+}
+
+#define EP93XX_GPIO_BANK(name, dr, ddr, base_gpio) \
+ { \
+ .chip = { \
+ .label = name, \
+ .direction_input = ep93xx_gpio_direction_input, \
+ .direction_output = ep93xx_gpio_direction_output, \
+ .get = ep93xx_gpio_get, \
+ .set = ep93xx_gpio_set, \
+ .dbg_show = ep93xx_gpio_dbg_show, \
+ .base = base_gpio, \
+ .ngpio = 8, \
+ }, \
+ .data_reg = EP93XX_GPIO_REG(dr), \
+ .data_dir_reg = EP93XX_GPIO_REG(ddr), \
+ }
+
+static struct ep93xx_gpio_chip ep93xx_gpio_banks[] = {
+ EP93XX_GPIO_BANK("A", 0x00, 0x10, 0),
+ EP93XX_GPIO_BANK("B", 0x04, 0x14, 8),
+ EP93XX_GPIO_BANK("C", 0x30, 0x34, 40),
+ EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24),
+ EP93XX_GPIO_BANK("E", 0x20, 0x24, 32),
+ EP93XX_GPIO_BANK("F", 0x08, 0x18, 16),
+ EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48),
+ EP93XX_GPIO_BANK("H", 0x40, 0x44, 56),
+};
+
+void __init ep93xx_gpio_init(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++)
+ gpiochip_add(&ep93xx_gpio_banks[i].chip);
+}
diff --git a/include/asm-arm/arch-ep93xx/gpio.h b/include/asm-arm/arch-ep93xx/gpio.h
index 9b1864b..186e7c7 100644
--- a/include/asm-arm/arch-ep93xx/gpio.h
+++ b/include/asm-arm/arch-ep93xx/gpio.h
@@ -101,30 +101,17 @@
/* new generic GPIO API - see Documentation/gpio.txt */
-static inline int gpio_request(unsigned gpio, const char *label)
-{
- if (gpio > EP93XX_GPIO_LINE_MAX)
- return -EINVAL;
- return 0;
-}
+#include <asm-generic/gpio.h>
-static inline void gpio_free(unsigned gpio)
-{
-}
-
-int gpio_direction_input(unsigned gpio);
-int gpio_direction_output(unsigned gpio, int value);
-int gpio_get_value(unsigned gpio);
-void gpio_set_value(unsigned gpio, int value);
-
-#include <asm-generic/gpio.h> /* cansleep wrappers */
+#define gpio_get_value __gpio_get_value
+#define gpio_set_value __gpio_set_value
+#define gpio_cansleep __gpio_cansleep
/*
* Map GPIO A0..A7 (0..7) to irq 64..71,
* B0..B7 (7..15) to irq 72..79, and
* F0..F7 (16..24) to irq 80..87.
*/
-
static inline int gpio_to_irq(unsigned gpio)
{
if (gpio <= EP93XX_GPIO_LINE_MAX_IRQ)
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