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/*
* 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 <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 alloc_mask;
char name[32];
};
static struct pio_device pio_dev[MAX_NR_PIO_DEVICES];
void portmux_set_func(unsigned int portmux_id, unsigned int pin_id,
unsigned int function_id)
{
struct pio_device *pio;
u32 mask = 1 << pin_id;
BUG_ON(portmux_id >= MAX_NR_PIO_DEVICES);
pio = &pio_dev[portmux_id];
if (function_id)
pio_writel(pio, BSR, mask);
else
pio_writel(pio, ASR, mask);
pio_writel(pio, PDR, mask);
}
static int __init pio_probe(struct platform_device *pdev)
{
struct pio_device *pio = NULL;
BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES);
pio = &pio_dev[pdev->id];
BUG_ON(!pio->regs);
/* TODO: Interrupts */
platform_set_drvdata(pdev, pio);
printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n",
pio->name, pio->regs, platform_get_irq(pdev, 0));
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);
}
subsys_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);
pio_writel(pio, ODR, ~0UL);
pio_writel(pio, PER, ~0UL);
}
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