| Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Atmel PIO2 Port Multiplexer support |
| 3 | * |
| 4 | * Copyright (C) 2004-2006 Atmel Corporation |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/clk.h> |
| 12 | #include <linux/debugfs.h> |
| 13 | #include <linux/fs.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | |
| 16 | #include <asm/io.h> |
| 17 | |
| 18 | #include <asm/arch/portmux.h> |
| 19 | |
| 20 | #include "pio.h" |
| 21 | |
| 22 | #define MAX_NR_PIO_DEVICES 8 |
| 23 | |
| 24 | struct pio_device { |
| 25 | void __iomem *regs; |
| 26 | const struct platform_device *pdev; |
| 27 | struct clk *clk; |
| 28 | u32 alloc_mask; |
| 29 | char name[32]; |
| 30 | }; |
| 31 | |
| 32 | static struct pio_device pio_dev[MAX_NR_PIO_DEVICES]; |
| 33 | |
| 34 | void portmux_set_func(unsigned int portmux_id, unsigned int pin_id, |
| 35 | unsigned int function_id) |
| 36 | { |
| 37 | struct pio_device *pio; |
| 38 | u32 mask = 1 << pin_id; |
| 39 | |
| 40 | BUG_ON(portmux_id >= MAX_NR_PIO_DEVICES); |
| 41 | |
| 42 | pio = &pio_dev[portmux_id]; |
| 43 | |
| 44 | if (function_id) |
| 45 | pio_writel(pio, BSR, mask); |
| 46 | else |
| 47 | pio_writel(pio, ASR, mask); |
| 48 | pio_writel(pio, PDR, mask); |
| 49 | } |
| 50 | |
| 51 | static int __init pio_probe(struct platform_device *pdev) |
| 52 | { |
| 53 | struct pio_device *pio = NULL; |
| 54 | |
| 55 | BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES); |
| 56 | pio = &pio_dev[pdev->id]; |
| 57 | BUG_ON(!pio->regs); |
| 58 | |
| 59 | /* TODO: Interrupts */ |
| 60 | |
| 61 | platform_set_drvdata(pdev, pio); |
| 62 | |
| 63 | printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n", |
| 64 | pio->name, pio->regs, platform_get_irq(pdev, 0)); |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static struct platform_driver pio_driver = { |
| 70 | .probe = pio_probe, |
| 71 | .driver = { |
| 72 | .name = "pio", |
| 73 | }, |
| 74 | }; |
| 75 | |
| 76 | static int __init pio_init(void) |
| 77 | { |
| 78 | return platform_driver_register(&pio_driver); |
| 79 | } |
| 80 | subsys_initcall(pio_init); |
| 81 | |
| 82 | void __init at32_init_pio(struct platform_device *pdev) |
| 83 | { |
| 84 | struct resource *regs; |
| 85 | struct pio_device *pio; |
| 86 | |
| 87 | if (pdev->id > MAX_NR_PIO_DEVICES) { |
| 88 | dev_err(&pdev->dev, "only %d PIO devices supported\n", |
| 89 | MAX_NR_PIO_DEVICES); |
| 90 | return; |
| 91 | } |
| 92 | |
| 93 | pio = &pio_dev[pdev->id]; |
| 94 | snprintf(pio->name, sizeof(pio->name), "pio%d", pdev->id); |
| 95 | |
| 96 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 97 | if (!regs) { |
| 98 | dev_err(&pdev->dev, "no mmio resource defined\n"); |
| 99 | return; |
| 100 | } |
| 101 | |
| 102 | pio->clk = clk_get(&pdev->dev, "mck"); |
| 103 | if (IS_ERR(pio->clk)) |
| 104 | /* |
| 105 | * This is a fatal error, but if we continue we might |
| 106 | * be so lucky that we manage to initialize the |
| 107 | * console and display this message... |
| 108 | */ |
| 109 | dev_err(&pdev->dev, "no mck clock defined\n"); |
| 110 | else |
| 111 | clk_enable(pio->clk); |
| 112 | |
| 113 | pio->pdev = pdev; |
| 114 | pio->regs = ioremap(regs->start, regs->end - regs->start + 1); |
| 115 | |
| 116 | pio_writel(pio, ODR, ~0UL); |
| 117 | pio_writel(pio, PER, ~0UL); |
| 118 | } |