119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/*
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* Atmel PIO2 Port Multiplexer support
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*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/platform_device.h>
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#include <asm/io.h>
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#include <asm/arch/portmux.h>
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#include "pio.h"
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#define MAX_NR_PIO_DEVICES 8
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struct pio_device {
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void __iomem *regs;
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const struct platform_device *pdev;
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struct clk *clk;
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u32 alloc_mask;
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char name[32];
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};
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static struct pio_device pio_dev[MAX_NR_PIO_DEVICES];
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void portmux_set_func(unsigned int portmux_id, unsigned int pin_id,
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unsigned int function_id)
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{
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struct pio_device *pio;
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u32 mask = 1 << pin_id;
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BUG_ON(portmux_id >= MAX_NR_PIO_DEVICES);
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pio = &pio_dev[portmux_id];
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if (function_id)
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pio_writel(pio, BSR, mask);
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else
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pio_writel(pio, ASR, mask);
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pio_writel(pio, PDR, mask);
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}
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static int __init pio_probe(struct platform_device *pdev)
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{
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struct pio_device *pio = NULL;
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BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES);
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pio = &pio_dev[pdev->id];
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BUG_ON(!pio->regs);
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/* TODO: Interrupts */
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platform_set_drvdata(pdev, pio);
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printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n",
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pio->name, pio->regs, platform_get_irq(pdev, 0));
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return 0;
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}
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static struct platform_driver pio_driver = {
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.probe = pio_probe,
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.driver = {
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.name = "pio",
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},
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};
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static int __init pio_init(void)
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{
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return platform_driver_register(&pio_driver);
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}
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subsys_initcall(pio_init);
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void __init at32_init_pio(struct platform_device *pdev)
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{
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struct resource *regs;
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struct pio_device *pio;
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if (pdev->id > MAX_NR_PIO_DEVICES) {
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dev_err(&pdev->dev, "only %d PIO devices supported\n",
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MAX_NR_PIO_DEVICES);
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return;
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}
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pio = &pio_dev[pdev->id];
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snprintf(pio->name, sizeof(pio->name), "pio%d", pdev->id);
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!regs) {
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dev_err(&pdev->dev, "no mmio resource defined\n");
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return;
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}
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pio->clk = clk_get(&pdev->dev, "mck");
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if (IS_ERR(pio->clk))
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/*
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* This is a fatal error, but if we continue we might
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* be so lucky that we manage to initialize the
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* console and display this message...
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*/
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dev_err(&pdev->dev, "no mck clock defined\n");
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else
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clk_enable(pio->clk);
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pio->pdev = pdev;
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pio->regs = ioremap(regs->start, regs->end - regs->start + 1);
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pio_writel(pio, ODR, ~0UL);
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pio_writel(pio, PER, ~0UL);
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}
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