471 lines
10 KiB
C
471 lines
10 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/export.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/gpio.h>
|
|
#include <asm/io.h>
|
|
|
|
#include <mach/portmux.h>
|
|
|
|
#include "pio.h"
|
|
|
|
#define MAX_NR_PIO_DEVICES 8
|
|
|
|
struct pio_device {
|
|
struct gpio_chip chip;
|
|
void __iomem *regs;
|
|
const struct platform_device *pdev;
|
|
struct clk *clk;
|
|
u32 pinmux_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 */
|
|
static DEFINE_SPINLOCK(pio_lock);
|
|
|
|
void __init at32_select_periph(unsigned int port, u32 pin_mask,
|
|
unsigned int periph, unsigned long flags)
|
|
{
|
|
struct pio_device *pio;
|
|
|
|
/* assign and verify pio */
|
|
pio = gpio_to_pio(port);
|
|
if (unlikely(!pio)) {
|
|
printk(KERN_WARNING "pio: invalid port %u\n", port);
|
|
goto fail;
|
|
}
|
|
|
|
/* Test if any of the requested pins is already muxed */
|
|
spin_lock(&pio_lock);
|
|
if (unlikely(pio->pinmux_mask & pin_mask)) {
|
|
printk(KERN_WARNING "%s: pin(s) busy (requested 0x%x, busy 0x%x)\n",
|
|
pio->name, pin_mask, pio->pinmux_mask & pin_mask);
|
|
spin_unlock(&pio_lock);
|
|
goto fail;
|
|
}
|
|
|
|
pio->pinmux_mask |= pin_mask;
|
|
|
|
/* enable pull ups */
|
|
pio_writel(pio, PUER, pin_mask);
|
|
|
|
/* select either peripheral A or B */
|
|
if (periph)
|
|
pio_writel(pio, BSR, pin_mask);
|
|
else
|
|
pio_writel(pio, ASR, pin_mask);
|
|
|
|
/* enable peripheral control */
|
|
pio_writel(pio, PDR, pin_mask);
|
|
|
|
/* Disable pull ups if not requested. */
|
|
if (!(flags & AT32_GPIOF_PULLUP))
|
|
pio_writel(pio, PUDR, pin_mask);
|
|
|
|
spin_unlock(&pio_lock);
|
|
|
|
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);
|
|
|
|
return;
|
|
|
|
fail:
|
|
dump_stack();
|
|
}
|
|
|
|
/*
|
|
* Undo a previous pin reservation. Will not affect the hardware
|
|
* configuration.
|
|
*/
|
|
void at32_deselect_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);
|
|
dump_stack();
|
|
return;
|
|
}
|
|
|
|
clear_bit(pin_index, &pio->pinmux_mask);
|
|
}
|
|
|
|
/* Reserve a pin, preventing anyone else from changing its configuration. */
|
|
void __init at32_reserve_pin(unsigned int port, u32 pin_mask)
|
|
{
|
|
struct pio_device *pio;
|
|
|
|
/* assign and verify pio */
|
|
pio = gpio_to_pio(port);
|
|
if (unlikely(!pio)) {
|
|
printk(KERN_WARNING "pio: invalid port %u\n", port);
|
|
goto fail;
|
|
}
|
|
|
|
/* Test if any of the requested pins is already muxed */
|
|
spin_lock(&pio_lock);
|
|
if (unlikely(pio->pinmux_mask & pin_mask)) {
|
|
printk(KERN_WARNING "%s: pin(s) busy (req. 0x%x, busy 0x%x)\n",
|
|
pio->name, pin_mask, pio->pinmux_mask & pin_mask);
|
|
spin_unlock(&pio_lock);
|
|
goto fail;
|
|
}
|
|
|
|
/* Reserve pins */
|
|
pio->pinmux_mask |= pin_mask;
|
|
spin_unlock(&pio_lock);
|
|
return;
|
|
|
|
fail:
|
|
dump_stack();
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/* GPIO API */
|
|
|
|
static int direction_input(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct pio_device *pio = container_of(chip, struct pio_device, chip);
|
|
u32 mask = 1 << offset;
|
|
|
|
if (!(pio_readl(pio, PSR) & mask))
|
|
return -EINVAL;
|
|
|
|
pio_writel(pio, ODR, mask);
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_get(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct pio_device *pio = container_of(chip, struct pio_device, chip);
|
|
|
|
return (pio_readl(pio, PDSR) >> offset) & 1;
|
|
}
|
|
|
|
static void gpio_set(struct gpio_chip *chip, unsigned offset, int value);
|
|
|
|
static int direction_output(struct gpio_chip *chip, unsigned offset, int value)
|
|
{
|
|
struct pio_device *pio = container_of(chip, struct pio_device, chip);
|
|
u32 mask = 1 << offset;
|
|
|
|
if (!(pio_readl(pio, PSR) & mask))
|
|
return -EINVAL;
|
|
|
|
gpio_set(chip, offset, value);
|
|
pio_writel(pio, OER, mask);
|
|
return 0;
|
|
}
|
|
|
|
static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
|
|
{
|
|
struct pio_device *pio = container_of(chip, struct pio_device, chip);
|
|
u32 mask = 1 << offset;
|
|
|
|
if (value)
|
|
pio_writel(pio, SODR, mask);
|
|
else
|
|
pio_writel(pio, CODR, mask);
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/* GPIO IRQ support */
|
|
|
|
static void gpio_irq_mask(struct irq_data *d)
|
|
{
|
|
unsigned gpio = irq_to_gpio(d->irq);
|
|
struct pio_device *pio = &pio_dev[gpio >> 5];
|
|
|
|
pio_writel(pio, IDR, 1 << (gpio & 0x1f));
|
|
}
|
|
|
|
static void gpio_irq_unmask(struct irq_data *d)
|
|
{
|
|
unsigned gpio = irq_to_gpio(d->irq);
|
|
struct pio_device *pio = &pio_dev[gpio >> 5];
|
|
|
|
pio_writel(pio, IER, 1 << (gpio & 0x1f));
|
|
}
|
|
|
|
static int gpio_irq_type(struct irq_data *d, unsigned type)
|
|
{
|
|
if (type != IRQ_TYPE_EDGE_BOTH && type != IRQ_TYPE_NONE)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct irq_chip gpio_irqchip = {
|
|
.name = "gpio",
|
|
.irq_mask = gpio_irq_mask,
|
|
.irq_unmask = gpio_irq_unmask,
|
|
.irq_set_type = gpio_irq_type,
|
|
};
|
|
|
|
static void gpio_irq_handler(struct irq_desc *desc)
|
|
{
|
|
struct pio_device *pio = irq_desc_get_chip_data(desc);
|
|
unsigned gpio_irq;
|
|
|
|
gpio_irq = (unsigned) irq_desc_get_handler_data(desc);
|
|
for (;;) {
|
|
u32 isr;
|
|
|
|
/* 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;
|
|
generic_handle_irq(i);
|
|
} while (isr);
|
|
}
|
|
}
|
|
|
|
static void __init
|
|
gpio_irq_setup(struct pio_device *pio, int irq, int gpio_irq)
|
|
{
|
|
unsigned i;
|
|
|
|
irq_set_chip_data(irq, pio);
|
|
|
|
for (i = 0; i < 32; i++, gpio_irq++) {
|
|
irq_set_chip_data(gpio_irq, pio);
|
|
irq_set_chip_and_handler(gpio_irq, &gpio_irqchip,
|
|
handle_simple_irq);
|
|
}
|
|
|
|
irq_set_chained_handler_and_data(irq, gpio_irq_handler,
|
|
(void *)gpio_irq);
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
#include <linux/seq_file.h>
|
|
|
|
/*
|
|
* This shows more info than the generic gpio dump code:
|
|
* pullups, deglitching, open drain drive.
|
|
*/
|
|
static void pio_bank_show(struct seq_file *s, struct gpio_chip *chip)
|
|
{
|
|
struct pio_device *pio = container_of(chip, struct pio_device, chip);
|
|
u32 psr, osr, imr, pdsr, pusr, ifsr, mdsr;
|
|
unsigned i;
|
|
u32 mask;
|
|
char bank;
|
|
|
|
psr = pio_readl(pio, PSR);
|
|
osr = pio_readl(pio, OSR);
|
|
imr = pio_readl(pio, IMR);
|
|
pdsr = pio_readl(pio, PDSR);
|
|
pusr = pio_readl(pio, PUSR);
|
|
ifsr = pio_readl(pio, IFSR);
|
|
mdsr = pio_readl(pio, MDSR);
|
|
|
|
bank = 'A' + pio->pdev->id;
|
|
|
|
for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
|
|
const char *label;
|
|
|
|
label = gpiochip_is_requested(chip, i);
|
|
if (!label && (imr & mask))
|
|
label = "[irq]";
|
|
if (!label)
|
|
continue;
|
|
|
|
seq_printf(s, " gpio-%-3d P%c%-2d (%-12s) %s %s %s",
|
|
chip->base + i, bank, i,
|
|
label,
|
|
(osr & mask) ? "out" : "in ",
|
|
(mask & pdsr) ? "hi" : "lo",
|
|
(mask & pusr) ? " " : "up");
|
|
if (ifsr & mask)
|
|
seq_printf(s, " deglitch");
|
|
if ((osr & mdsr) & mask)
|
|
seq_printf(s, " open-drain");
|
|
if (imr & mask)
|
|
seq_printf(s, " irq-%d edge-both",
|
|
gpio_to_irq(chip->base + i));
|
|
seq_printf(s, "\n");
|
|
}
|
|
}
|
|
|
|
#else
|
|
#define pio_bank_show NULL
|
|
#endif
|
|
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
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);
|
|
|
|
pio->chip.label = pio->name;
|
|
pio->chip.base = pdev->id * 32;
|
|
pio->chip.ngpio = 32;
|
|
pio->chip.dev = &pdev->dev;
|
|
pio->chip.owner = THIS_MODULE;
|
|
|
|
pio->chip.direction_input = direction_input;
|
|
pio->chip.get = gpio_get;
|
|
pio->chip.direction_output = direction_output;
|
|
pio->chip.set = gpio_set;
|
|
pio->chip.dbg_show = pio_bank_show;
|
|
|
|
gpiochip_add(&pio->chip);
|
|
|
|
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 = {
|
|
.driver = {
|
|
.name = "pio",
|
|
},
|
|
};
|
|
|
|
static int __init pio_init(void)
|
|
{
|
|
return platform_driver_probe(&pio_driver, pio_probe);
|
|
}
|
|
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, resource_size(regs));
|
|
|
|
/* start with irqs disabled and acked */
|
|
pio_writel(pio, IDR, ~0UL);
|
|
(void) pio_readl(pio, ISR);
|
|
}
|