forked from Minki/linux
gpio/ep93xx: convert to platform_driver and use basic_mmio_gpio library
This converts the gpio-ep93xx driver into a platform_driver and uses the basic_mmio_gpio library. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
H Hartley Sweeten
Grant Likely
parent
6dd599f8af
commit
1e4c88420e
@ -174,14 +174,10 @@ struct sys_timer ep93xx_timer = {
|
||||
/*************************************************************************
|
||||
* EP93xx IRQ handling
|
||||
*************************************************************************/
|
||||
extern void ep93xx_gpio_init_irq(void);
|
||||
|
||||
void __init ep93xx_init_irq(void)
|
||||
{
|
||||
vic_init(EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
|
||||
vic_init(EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0);
|
||||
|
||||
ep93xx_gpio_init_irq();
|
||||
}
|
||||
|
||||
|
||||
@ -240,6 +236,24 @@ unsigned int ep93xx_chip_revision(void)
|
||||
return v;
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
* EP93xx GPIO
|
||||
*************************************************************************/
|
||||
static struct resource ep93xx_gpio_resource[] = {
|
||||
{
|
||||
.start = EP93XX_GPIO_PHYS_BASE,
|
||||
.end = EP93XX_GPIO_PHYS_BASE + 0xcc - 1,
|
||||
.flags = IORESOURCE_MEM,
|
||||
},
|
||||
};
|
||||
|
||||
static struct platform_device ep93xx_gpio_device = {
|
||||
.name = "gpio-ep93xx",
|
||||
.id = -1,
|
||||
.num_resources = ARRAY_SIZE(ep93xx_gpio_resource),
|
||||
.resource = ep93xx_gpio_resource,
|
||||
};
|
||||
|
||||
/*************************************************************************
|
||||
* EP93xx peripheral handling
|
||||
*************************************************************************/
|
||||
@ -866,14 +880,13 @@ void __init ep93xx_register_ac97(void)
|
||||
platform_device_register(&ep93xx_pcm_device);
|
||||
}
|
||||
|
||||
extern void ep93xx_gpio_init(void);
|
||||
|
||||
void __init ep93xx_init_devices(void)
|
||||
{
|
||||
/* Disallow access to MaverickCrunch initially */
|
||||
ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);
|
||||
|
||||
ep93xx_gpio_init();
|
||||
/* Get the GPIO working early, other devices need it */
|
||||
platform_device_register(&ep93xx_gpio_device);
|
||||
|
||||
amba_device_register(&uart1_device, &iomem_resource);
|
||||
amba_device_register(&uart2_device, &iomem_resource);
|
||||
|
||||
@ -87,6 +87,7 @@ config GPIO_IT8761E
|
||||
config GPIO_EP93XX
|
||||
def_bool y
|
||||
depends on ARCH_EP93XX
|
||||
select GPIO_GENERIC
|
||||
|
||||
config GPIO_EXYNOS4
|
||||
def_bool y
|
||||
|
||||
@ -2,6 +2,7 @@
|
||||
* Generic EP93xx GPIO handling
|
||||
*
|
||||
* Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
|
||||
* Copyright (c) 2011 H Hartley Sweeten <hsweeten@visionengravers.com>
|
||||
*
|
||||
* Based on code originally from:
|
||||
* linux/arch/arm/mach-ep93xx/core.c
|
||||
@ -14,14 +15,20 @@
|
||||
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/irq.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/basic_mmio_gpio.h>
|
||||
|
||||
#include <mach/hardware.h>
|
||||
|
||||
struct ep93xx_gpio {
|
||||
void __iomem *mmio_base;
|
||||
struct bgpio_chip bgc[8];
|
||||
};
|
||||
|
||||
/*************************************************************************
|
||||
* Interrupt handling for EP93xx on-chip GPIOs
|
||||
*************************************************************************/
|
||||
@ -223,7 +230,7 @@ static struct irq_chip ep93xx_gpio_irq_chip = {
|
||||
.irq_set_type = ep93xx_gpio_irq_type,
|
||||
};
|
||||
|
||||
void __init ep93xx_gpio_init_irq(void)
|
||||
static void ep93xx_gpio_init_irq(void)
|
||||
{
|
||||
int gpio_irq;
|
||||
|
||||
@ -258,87 +265,33 @@ void __init ep93xx_gpio_init_irq(void)
|
||||
/*************************************************************************
|
||||
* gpiolib interface for EP93xx on-chip GPIOs
|
||||
*************************************************************************/
|
||||
struct ep93xx_gpio_chip {
|
||||
struct gpio_chip chip;
|
||||
|
||||
void __iomem *data_reg;
|
||||
void __iomem *data_dir_reg;
|
||||
struct ep93xx_gpio_bank {
|
||||
const char *label;
|
||||
int data;
|
||||
int dir;
|
||||
int base;
|
||||
bool has_debounce;
|
||||
};
|
||||
|
||||
#define to_ep93xx_gpio_chip(c) container_of(c, struct ep93xx_gpio_chip, chip)
|
||||
|
||||
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);
|
||||
#define EP93XX_GPIO_BANK(_label, _data, _dir, _base, _debounce) \
|
||||
{ \
|
||||
.label = _label, \
|
||||
.data = _data, \
|
||||
.dir = _dir, \
|
||||
.base = _base, \
|
||||
.has_debounce = _debounce, \
|
||||
}
|
||||
|
||||
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 struct ep93xx_gpio_bank ep93xx_gpio_banks[] = {
|
||||
EP93XX_GPIO_BANK("A", 0x00, 0x10, 0, true),
|
||||
EP93XX_GPIO_BANK("B", 0x04, 0x14, 8, true),
|
||||
EP93XX_GPIO_BANK("C", 0x08, 0x18, 40, false),
|
||||
EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24, false),
|
||||
EP93XX_GPIO_BANK("E", 0x20, 0x24, 32, false),
|
||||
EP93XX_GPIO_BANK("F", 0x30, 0x34, 16, true),
|
||||
EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48, false),
|
||||
EP93XX_GPIO_BANK("H", 0x40, 0x44, 56, false),
|
||||
};
|
||||
|
||||
static int ep93xx_gpio_set_debounce(struct gpio_chip *chip,
|
||||
unsigned offset, unsigned debounce)
|
||||
@ -354,55 +307,100 @@ static int ep93xx_gpio_set_debounce(struct gpio_chip *chip,
|
||||
return 0;
|
||||
}
|
||||
|
||||
#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, \
|
||||
.base = base_gpio, \
|
||||
.ngpio = 8, \
|
||||
}, \
|
||||
.data_reg = EP93XX_GPIO_REG(dr), \
|
||||
.data_dir_reg = EP93XX_GPIO_REG(ddr), \
|
||||
static int ep93xx_gpio_add_bank(struct bgpio_chip *bgc, struct device *dev,
|
||||
void __iomem *mmio_base, struct ep93xx_gpio_bank *bank)
|
||||
{
|
||||
void __iomem *data = mmio_base + bank->data;
|
||||
void __iomem *dir = mmio_base + bank->dir;
|
||||
int err;
|
||||
|
||||
err = bgpio_init(bgc, dev, 1, data, NULL, NULL, dir, NULL, false);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
bgc->gc.label = bank->label;
|
||||
bgc->gc.base = bank->base;
|
||||
|
||||
if (bank->has_debounce)
|
||||
bgc->gc.set_debounce = ep93xx_gpio_set_debounce;
|
||||
|
||||
return gpiochip_add(&bgc->gc);
|
||||
}
|
||||
|
||||
static int __devinit ep93xx_gpio_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct ep93xx_gpio *ep93xx_gpio;
|
||||
struct resource *res;
|
||||
void __iomem *mmio;
|
||||
int i;
|
||||
int ret;
|
||||
|
||||
ep93xx_gpio = kzalloc(sizeof(*ep93xx_gpio), GFP_KERNEL);
|
||||
if (!ep93xx_gpio)
|
||||
return -ENOMEM;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!res) {
|
||||
ret = -ENXIO;
|
||||
goto exit_free;
|
||||
}
|
||||
|
||||
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", 0x08, 0x18, 40),
|
||||
EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24),
|
||||
EP93XX_GPIO_BANK("E", 0x20, 0x24, 32),
|
||||
EP93XX_GPIO_BANK("F", 0x30, 0x34, 16),
|
||||
EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48),
|
||||
EP93XX_GPIO_BANK("H", 0x40, 0x44, 56),
|
||||
};
|
||||
if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
|
||||
ret = -EBUSY;
|
||||
goto exit_free;
|
||||
}
|
||||
|
||||
void __init ep93xx_gpio_init(void)
|
||||
{
|
||||
int i;
|
||||
mmio = ioremap(res->start, resource_size(res));
|
||||
if (!mmio) {
|
||||
ret = -ENXIO;
|
||||
goto exit_release;
|
||||
}
|
||||
ep93xx_gpio->mmio_base = mmio;
|
||||
|
||||
/* Set Ports C, D, E, G, and H for GPIO use */
|
||||
/* 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_SYSCON_DEVCFG_GONK |
|
||||
EP93XX_SYSCON_DEVCFG_EONIDE |
|
||||
EP93XX_SYSCON_DEVCFG_GONIDE |
|
||||
EP93XX_SYSCON_DEVCFG_HONIDE);
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) {
|
||||
struct gpio_chip *chip = &ep93xx_gpio_banks[i].chip;
|
||||
struct bgpio_chip *bgc = &ep93xx_gpio->bgc[i];
|
||||
struct ep93xx_gpio_bank *bank = &ep93xx_gpio_banks[i];
|
||||
|
||||
/*
|
||||
* Ports A, B, and F support input debouncing when
|
||||
* used as interrupts.
|
||||
*/
|
||||
if (!strcmp(chip->label, "A") ||
|
||||
!strcmp(chip->label, "B") ||
|
||||
!strcmp(chip->label, "F"))
|
||||
chip->set_debounce = ep93xx_gpio_set_debounce;
|
||||
|
||||
gpiochip_add(chip);
|
||||
if (ep93xx_gpio_add_bank(bgc, &pdev->dev, mmio, bank))
|
||||
dev_warn(&pdev->dev, "Unable to add gpio bank %s\n",
|
||||
bank->label);
|
||||
}
|
||||
|
||||
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 = {
|
||||
.driver = {
|
||||
.name = "gpio-ep93xx",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ep93xx_gpio_probe,
|
||||
};
|
||||
|
||||
static int __init ep93xx_gpio_init(void)
|
||||
{
|
||||
pr_info("%s\n", __func__);
|
||||
return platform_driver_register(&ep93xx_gpio_driver);
|
||||
}
|
||||
postcore_initcall(ep93xx_gpio_init);
|
||||
|
||||
MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com> "
|
||||
"H Hartley Sweeten <hsweeten@visionengravers.com>");
|
||||
MODULE_DESCRIPTION("EP93XX GPIO driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user