419 строки
8.4 KiB
C
419 строки
8.4 KiB
C
/*
|
|
* Atmel PIO2 Port Multiplexer support
|
|
*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* 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/clk.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/gpio.h>
|
|
#include <asm/io.h>
|
|
|
|
#include <asm/arch/portmux.h>
|
|
|
|
#include "pio.h"
|
|
|
|
#define MAX_NR_PIO_DEVICES 8
|
|
|
|
struct pio_device {
|
|
void __iomem *regs;
|
|
const struct platform_device *pdev;
|
|
struct clk *clk;
|
|
u32 pinmux_mask;
|
|
u32 gpio_mask;
|
|
char name[8];
|
|
};
|
|
|
|
static struct pio_device pio_dev[MAX_NR_PIO_DEVICES];
|
|
|
|
static struct pio_device *gpio_to_pio(unsigned int gpio)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int index;
|
|
|
|
index = gpio >> 5;
|
|
if (index >= MAX_NR_PIO_DEVICES)
|
|
return NULL;
|
|
pio = &pio_dev[index];
|
|
if (!pio->regs)
|
|
return NULL;
|
|
|
|
return pio;
|
|
}
|
|
|
|
/* Pin multiplexing API */
|
|
|
|
void __init at32_select_periph(unsigned int pin, unsigned int periph,
|
|
unsigned long flags)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int pin_index = pin & 0x1f;
|
|
u32 mask = 1 << pin_index;
|
|
|
|
pio = gpio_to_pio(pin);
|
|
if (unlikely(!pio)) {
|
|
printk("pio: invalid pin %u\n", pin);
|
|
goto fail;
|
|
}
|
|
|
|
if (unlikely(test_and_set_bit(pin_index, &pio->pinmux_mask))) {
|
|
printk("%s: pin %u is busy\n", pio->name, pin_index);
|
|
goto fail;
|
|
}
|
|
|
|
pio_writel(pio, PUER, mask);
|
|
if (periph)
|
|
pio_writel(pio, BSR, mask);
|
|
else
|
|
pio_writel(pio, ASR, mask);
|
|
|
|
pio_writel(pio, PDR, mask);
|
|
if (!(flags & AT32_GPIOF_PULLUP))
|
|
pio_writel(pio, PUDR, mask);
|
|
|
|
/* gpio_request NOT allowed */
|
|
set_bit(pin_index, &pio->gpio_mask);
|
|
|
|
return;
|
|
|
|
fail:
|
|
dump_stack();
|
|
}
|
|
|
|
void __init at32_select_gpio(unsigned int pin, unsigned long flags)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int pin_index = pin & 0x1f;
|
|
u32 mask = 1 << pin_index;
|
|
|
|
pio = gpio_to_pio(pin);
|
|
if (unlikely(!pio)) {
|
|
printk("pio: invalid pin %u\n", pin);
|
|
goto fail;
|
|
}
|
|
|
|
if (unlikely(test_and_set_bit(pin_index, &pio->pinmux_mask))) {
|
|
printk("%s: pin %u is busy\n", pio->name, pin_index);
|
|
goto fail;
|
|
}
|
|
|
|
if (flags & AT32_GPIOF_OUTPUT) {
|
|
if (flags & AT32_GPIOF_HIGH)
|
|
pio_writel(pio, SODR, mask);
|
|
else
|
|
pio_writel(pio, CODR, mask);
|
|
if (flags & AT32_GPIOF_MULTIDRV)
|
|
pio_writel(pio, MDER, mask);
|
|
else
|
|
pio_writel(pio, MDDR, mask);
|
|
pio_writel(pio, PUDR, mask);
|
|
pio_writel(pio, OER, mask);
|
|
} else {
|
|
if (flags & AT32_GPIOF_PULLUP)
|
|
pio_writel(pio, PUER, mask);
|
|
else
|
|
pio_writel(pio, PUDR, mask);
|
|
if (flags & AT32_GPIOF_DEGLITCH)
|
|
pio_writel(pio, IFER, mask);
|
|
else
|
|
pio_writel(pio, IFDR, mask);
|
|
pio_writel(pio, ODR, mask);
|
|
}
|
|
|
|
pio_writel(pio, PER, mask);
|
|
|
|
/* gpio_request now allowed */
|
|
clear_bit(pin_index, &pio->gpio_mask);
|
|
|
|
return;
|
|
|
|
fail:
|
|
dump_stack();
|
|
}
|
|
|
|
/* Reserve a pin, preventing anyone else from changing its configuration. */
|
|
void __init at32_reserve_pin(unsigned int pin)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int pin_index = pin & 0x1f;
|
|
|
|
pio = gpio_to_pio(pin);
|
|
if (unlikely(!pio)) {
|
|
printk("pio: invalid pin %u\n", pin);
|
|
goto fail;
|
|
}
|
|
|
|
if (unlikely(test_and_set_bit(pin_index, &pio->pinmux_mask))) {
|
|
printk("%s: pin %u is busy\n", pio->name, pin_index);
|
|
goto fail;
|
|
}
|
|
|
|
return;
|
|
|
|
fail:
|
|
dump_stack();
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/* GPIO API */
|
|
|
|
int gpio_request(unsigned int gpio, const char *label)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int pin;
|
|
|
|
pio = gpio_to_pio(gpio);
|
|
if (!pio)
|
|
return -ENODEV;
|
|
|
|
pin = gpio & 0x1f;
|
|
if (test_and_set_bit(pin, &pio->gpio_mask))
|
|
return -EBUSY;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(gpio_request);
|
|
|
|
void gpio_free(unsigned int gpio)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int pin;
|
|
|
|
pio = gpio_to_pio(gpio);
|
|
if (!pio) {
|
|
printk(KERN_ERR
|
|
"gpio: attempted to free invalid pin %u\n", gpio);
|
|
return;
|
|
}
|
|
|
|
pin = gpio & 0x1f;
|
|
if (!test_and_clear_bit(pin, &pio->gpio_mask))
|
|
printk(KERN_ERR "gpio: freeing free or non-gpio pin %s-%u\n",
|
|
pio->name, pin);
|
|
}
|
|
EXPORT_SYMBOL(gpio_free);
|
|
|
|
int gpio_direction_input(unsigned int gpio)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int pin;
|
|
|
|
pio = gpio_to_pio(gpio);
|
|
if (!pio)
|
|
return -ENODEV;
|
|
|
|
pin = gpio & 0x1f;
|
|
pio_writel(pio, ODR, 1 << pin);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(gpio_direction_input);
|
|
|
|
int gpio_direction_output(unsigned int gpio, int value)
|
|
{
|
|
struct pio_device *pio;
|
|
unsigned int pin;
|
|
|
|
pio = gpio_to_pio(gpio);
|
|
if (!pio)
|
|
return -ENODEV;
|
|
|
|
gpio_set_value(gpio, value);
|
|
|
|
pin = gpio & 0x1f;
|
|
pio_writel(pio, OER, 1 << pin);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(gpio_direction_output);
|
|
|
|
int gpio_get_value(unsigned int gpio)
|
|
{
|
|
struct pio_device *pio = &pio_dev[gpio >> 5];
|
|
|
|
return (pio_readl(pio, PDSR) >> (gpio & 0x1f)) & 1;
|
|
}
|
|
EXPORT_SYMBOL(gpio_get_value);
|
|
|
|
void gpio_set_value(unsigned int gpio, int value)
|
|
{
|
|
struct pio_device *pio = &pio_dev[gpio >> 5];
|
|
u32 mask;
|
|
|
|
mask = 1 << (gpio & 0x1f);
|
|
if (value)
|
|
pio_writel(pio, SODR, mask);
|
|
else
|
|
pio_writel(pio, CODR, mask);
|
|
}
|
|
EXPORT_SYMBOL(gpio_set_value);
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/* GPIO IRQ support */
|
|
|
|
static void gpio_irq_mask(unsigned irq)
|
|
{
|
|
unsigned gpio = irq_to_gpio(irq);
|
|
struct pio_device *pio = &pio_dev[gpio >> 5];
|
|
|
|
pio_writel(pio, IDR, 1 << (gpio & 0x1f));
|
|
}
|
|
|
|
static void gpio_irq_unmask(unsigned irq)
|
|
{
|
|
unsigned gpio = irq_to_gpio(irq);
|
|
struct pio_device *pio = &pio_dev[gpio >> 5];
|
|
|
|
pio_writel(pio, IER, 1 << (gpio & 0x1f));
|
|
}
|
|
|
|
static int gpio_irq_type(unsigned irq, unsigned type)
|
|
{
|
|
if (type != IRQ_TYPE_EDGE_BOTH && type != IRQ_TYPE_NONE)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct irq_chip gpio_irqchip = {
|
|
.name = "gpio",
|
|
.mask = gpio_irq_mask,
|
|
.unmask = gpio_irq_unmask,
|
|
.set_type = gpio_irq_type,
|
|
};
|
|
|
|
static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
|
|
{
|
|
struct pio_device *pio = get_irq_chip_data(irq);
|
|
unsigned gpio_irq;
|
|
|
|
gpio_irq = (unsigned) get_irq_data(irq);
|
|
for (;;) {
|
|
u32 isr;
|
|
struct irq_desc *d;
|
|
|
|
/* ack pending GPIO interrupts */
|
|
isr = pio_readl(pio, ISR) & pio_readl(pio, IMR);
|
|
if (!isr)
|
|
break;
|
|
do {
|
|
int i;
|
|
|
|
i = ffs(isr) - 1;
|
|
isr &= ~(1 << i);
|
|
|
|
i += gpio_irq;
|
|
d = &irq_desc[i];
|
|
|
|
d->handle_irq(i, d);
|
|
} while (isr);
|
|
}
|
|
}
|
|
|
|
static void __init
|
|
gpio_irq_setup(struct pio_device *pio, int irq, int gpio_irq)
|
|
{
|
|
unsigned i;
|
|
|
|
set_irq_chip_data(irq, pio);
|
|
set_irq_data(irq, (void *) gpio_irq);
|
|
|
|
for (i = 0; i < 32; i++, gpio_irq++) {
|
|
set_irq_chip_data(gpio_irq, pio);
|
|
set_irq_chip_and_handler(gpio_irq, &gpio_irqchip,
|
|
handle_simple_irq);
|
|
}
|
|
|
|
set_irq_chained_handler(irq, gpio_irq_handler);
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
static int __init pio_probe(struct platform_device *pdev)
|
|
{
|
|
struct pio_device *pio = NULL;
|
|
int irq = platform_get_irq(pdev, 0);
|
|
int gpio_irq_base = GPIO_IRQ_BASE + pdev->id * 32;
|
|
|
|
BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES);
|
|
pio = &pio_dev[pdev->id];
|
|
BUG_ON(!pio->regs);
|
|
|
|
gpio_irq_setup(pio, irq, gpio_irq_base);
|
|
|
|
platform_set_drvdata(pdev, pio);
|
|
|
|
printk(KERN_DEBUG "%s: base 0x%p, irq %d chains %d..%d\n",
|
|
pio->name, pio->regs, irq, gpio_irq_base, gpio_irq_base + 31);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver pio_driver = {
|
|
.probe = pio_probe,
|
|
.driver = {
|
|
.name = "pio",
|
|
},
|
|
};
|
|
|
|
static int __init pio_init(void)
|
|
{
|
|
return platform_driver_register(&pio_driver);
|
|
}
|
|
postcore_initcall(pio_init);
|
|
|
|
void __init at32_init_pio(struct platform_device *pdev)
|
|
{
|
|
struct resource *regs;
|
|
struct pio_device *pio;
|
|
|
|
if (pdev->id > MAX_NR_PIO_DEVICES) {
|
|
dev_err(&pdev->dev, "only %d PIO devices supported\n",
|
|
MAX_NR_PIO_DEVICES);
|
|
return;
|
|
}
|
|
|
|
pio = &pio_dev[pdev->id];
|
|
snprintf(pio->name, sizeof(pio->name), "pio%d", pdev->id);
|
|
|
|
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!regs) {
|
|
dev_err(&pdev->dev, "no mmio resource defined\n");
|
|
return;
|
|
}
|
|
|
|
pio->clk = clk_get(&pdev->dev, "mck");
|
|
if (IS_ERR(pio->clk))
|
|
/*
|
|
* This is a fatal error, but if we continue we might
|
|
* be so lucky that we manage to initialize the
|
|
* console and display this message...
|
|
*/
|
|
dev_err(&pdev->dev, "no mck clock defined\n");
|
|
else
|
|
clk_enable(pio->clk);
|
|
|
|
pio->pdev = pdev;
|
|
pio->regs = ioremap(regs->start, regs->end - regs->start + 1);
|
|
|
|
/*
|
|
* request_gpio() is only valid for pins that have been
|
|
* explicitly configured as GPIO and not previously requested
|
|
*/
|
|
pio->gpio_mask = ~0UL;
|
|
|
|
/* start with irqs disabled and acked */
|
|
pio_writel(pio, IDR, ~0UL);
|
|
(void) pio_readl(pio, ISR);
|
|
}
|