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path: root/drivers/gpio/gpio-ep93xx.c
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Diffstat (limited to 'drivers/gpio/gpio-ep93xx.c')
-rw-r--r--drivers/gpio/gpio-ep93xx.c96
1 files changed, 41 insertions, 55 deletions
diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
index 3bfd3417ab1..dcc2bb4074e 100644
--- a/drivers/gpio/gpio-ep93xx.c
+++ b/drivers/gpio/gpio-ep93xx.c
@@ -1,7 +1,7 @@
/*
* Generic EP93xx GPIO handling
*
- * Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
+ * Copyright (c) 2008 Ryan Mallon
* Copyright (c) 2011 H Hartley Sweeten <hsweeten@visionengravers.com>
*
* Based on code originally from:
@@ -12,9 +12,8 @@
* published by the Free Software Foundation.
*/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
#include <linux/init.h>
+#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/gpio.h>
@@ -23,6 +22,9 @@
#include <linux/basic_mmio_gpio.h>
#include <mach/hardware.h>
+#include <mach/gpio-ep93xx.h>
+
+#define irq_to_gpio(irq) ((irq) - gpio_to_irq(0))
struct ep93xx_gpio {
void __iomem *mmio_base;
@@ -49,23 +51,18 @@ static void ep93xx_gpio_update_int_params(unsigned port)
{
BUG_ON(port > 2);
- __raw_writeb(0, EP93XX_GPIO_REG(int_en_register_offset[port]));
+ writeb_relaxed(0, EP93XX_GPIO_REG(int_en_register_offset[port]));
- __raw_writeb(gpio_int_type2[port],
+ writeb_relaxed(gpio_int_type2[port],
EP93XX_GPIO_REG(int_type2_register_offset[port]));
- __raw_writeb(gpio_int_type1[port],
+ writeb_relaxed(gpio_int_type1[port],
EP93XX_GPIO_REG(int_type1_register_offset[port]));
- __raw_writeb(gpio_int_unmasked[port] & gpio_int_enabled[port],
+ writeb(gpio_int_unmasked[port] & gpio_int_enabled[port],
EP93XX_GPIO_REG(int_en_register_offset[port]));
}
-static inline void ep93xx_gpio_int_mask(unsigned line)
-{
- gpio_int_unmasked[line >> 3] &= ~(1 << (line & 7));
-}
-
static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable)
{
int line = irq_to_gpio(irq);
@@ -77,7 +74,7 @@ static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable)
else
gpio_int_debounce[port] &= ~port_mask;
- __raw_writeb(gpio_int_debounce[port],
+ writeb(gpio_int_debounce[port],
EP93XX_GPIO_REG(int_debounce_register_offset[port]));
}
@@ -86,7 +83,7 @@ static void ep93xx_gpio_ab_irq_handler(unsigned int irq, struct irq_desc *desc)
unsigned char status;
int i;
- status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
+ status = readb(EP93XX_GPIO_A_INT_STATUS);
for (i = 0; i < 8; i++) {
if (status & (1 << i)) {
int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_A(0)) + i;
@@ -94,7 +91,7 @@ static void ep93xx_gpio_ab_irq_handler(unsigned int irq, struct irq_desc *desc)
}
}
- status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
+ status = readb(EP93XX_GPIO_B_INT_STATUS);
for (i = 0; i < 8; i++) {
if (status & (1 << i)) {
int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_B(0)) + i;
@@ -127,7 +124,7 @@ static void ep93xx_gpio_irq_ack(struct irq_data *d)
ep93xx_gpio_update_int_params(port);
}
- __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
+ writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
}
static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
@@ -142,7 +139,7 @@ static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
gpio_int_unmasked[port] &= ~port_mask;
ep93xx_gpio_update_int_params(port);
- __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
+ writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
}
static void ep93xx_gpio_irq_mask(struct irq_data *d)
@@ -208,7 +205,6 @@ static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
handler = handle_edge_irq;
break;
default:
- pr_err("failed to set irq type %d for gpio %d\n", type, gpio);
return -EINVAL;
}
@@ -307,6 +303,21 @@ static int ep93xx_gpio_set_debounce(struct gpio_chip *chip,
return 0;
}
+/*
+ * 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 int ep93xx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ int gpio = chip->base + offset;
+
+ if (gpio > EP93XX_GPIO_LINE_MAX_IRQ)
+ return -EINVAL;
+
+ return 64 + gpio;
+}
+
static int ep93xx_gpio_add_bank(struct bgpio_chip *bgc, struct device *dev,
void __iomem *mmio_base, struct ep93xx_gpio_bank *bank)
{
@@ -314,61 +325,43 @@ static int ep93xx_gpio_add_bank(struct bgpio_chip *bgc, struct device *dev,
void __iomem *dir = mmio_base + bank->dir;
int err;
- err = bgpio_init(bgc, dev, 1, data, NULL, NULL, dir, NULL, false);
+ err = bgpio_init(bgc, dev, 1, data, NULL, NULL, dir, NULL, 0);
if (err)
return err;
bgc->gc.label = bank->label;
bgc->gc.base = bank->base;
- if (bank->has_debounce)
+ if (bank->has_debounce) {
bgc->gc.set_debounce = ep93xx_gpio_set_debounce;
+ bgc->gc.to_irq = ep93xx_gpio_to_irq;
+ }
return gpiochip_add(&bgc->gc);
}
-static int __devinit ep93xx_gpio_probe(struct platform_device *pdev)
+static int ep93xx_gpio_probe(struct platform_device *pdev)
{
struct ep93xx_gpio *ep93xx_gpio;
struct resource *res;
- void __iomem *mmio;
int i;
- int ret;
+ struct device *dev = &pdev->dev;
- ep93xx_gpio = kzalloc(sizeof(*ep93xx_gpio), GFP_KERNEL);
+ ep93xx_gpio = devm_kzalloc(dev, sizeof(struct ep93xx_gpio), GFP_KERNEL);
if (!ep93xx_gpio)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- ret = -ENXIO;
- goto exit_free;
- }
-
- if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
- ret = -EBUSY;
- goto exit_free;
- }
-
- mmio = ioremap(res->start, resource_size(res));
- if (!mmio) {
- ret = -ENXIO;
- goto exit_release;
- }
- ep93xx_gpio->mmio_base = mmio;
-
- /* Default all ports to GPIO */
- ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
- EP93XX_SYSCON_DEVCFG_GONK |
- EP93XX_SYSCON_DEVCFG_EONIDE |
- EP93XX_SYSCON_DEVCFG_GONIDE |
- EP93XX_SYSCON_DEVCFG_HONIDE);
+ ep93xx_gpio->mmio_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ep93xx_gpio->mmio_base))
+ return PTR_ERR(ep93xx_gpio->mmio_base);
for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) {
struct bgpio_chip *bgc = &ep93xx_gpio->bgc[i];
struct ep93xx_gpio_bank *bank = &ep93xx_gpio_banks[i];
- if (ep93xx_gpio_add_bank(bgc, &pdev->dev, mmio, bank))
+ if (ep93xx_gpio_add_bank(bgc, &pdev->dev,
+ ep93xx_gpio->mmio_base, bank))
dev_warn(&pdev->dev, "Unable to add gpio bank %s\n",
bank->label);
}
@@ -376,13 +369,6 @@ static int __devinit ep93xx_gpio_probe(struct platform_device *pdev)
ep93xx_gpio_init_irq();
return 0;
-
-exit_release:
- release_mem_region(res->start, resource_size(res));
-exit_free:
- kfree(ep93xx_gpio);
- dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, ret);
- return ret;
}
static struct platform_driver ep93xx_gpio_driver = {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-14 14:41:01 +0000