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; |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 28 | u32 pinmux_mask; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 29 | char name[32]; |
| 30 | }; |
| 31 | |
| 32 | static struct pio_device pio_dev[MAX_NR_PIO_DEVICES]; |
| 33 | |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 34 | static struct pio_device *gpio_to_pio(unsigned int gpio) |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 35 | { |
| 36 | struct pio_device *pio; |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 37 | unsigned int index; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 38 | |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 39 | index = gpio >> 5; |
| 40 | if (index >= MAX_NR_PIO_DEVICES) |
| 41 | return NULL; |
| 42 | pio = &pio_dev[index]; |
| 43 | if (!pio->regs) |
| 44 | return NULL; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 45 | |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 46 | return pio; |
| 47 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 48 | |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 49 | /* Pin multiplexing API */ |
| 50 | |
| 51 | void __init at32_select_periph(unsigned int pin, unsigned int periph, |
| 52 | unsigned long flags) |
| 53 | { |
| 54 | struct pio_device *pio; |
| 55 | unsigned int pin_index = pin & 0x1f; |
| 56 | u32 mask = 1 << pin_index; |
| 57 | |
| 58 | pio = gpio_to_pio(pin); |
| 59 | if (unlikely(!pio)) { |
| 60 | printk("pio: invalid pin %u\n", pin); |
| 61 | goto fail; |
| 62 | } |
| 63 | |
| 64 | if (unlikely(test_and_set_bit(pin_index, &pio->pinmux_mask))) { |
| 65 | printk("%s: pin %u is busy\n", pio->name, pin_index); |
| 66 | goto fail; |
| 67 | } |
| 68 | |
| 69 | pio_writel(pio, PUER, mask); |
| 70 | if (periph) |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 71 | pio_writel(pio, BSR, mask); |
| 72 | else |
| 73 | pio_writel(pio, ASR, mask); |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 74 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 75 | pio_writel(pio, PDR, mask); |
Haavard Skinnemoen | c3e2a79 | 2006-12-04 13:46:52 +0100 | [diff] [blame] | 76 | if (!(flags & AT32_GPIOF_PULLUP)) |
| 77 | pio_writel(pio, PUDR, mask); |
| 78 | |
| 79 | return; |
| 80 | |
| 81 | fail: |
| 82 | dump_stack(); |
| 83 | } |
| 84 | |
| 85 | void __init at32_select_gpio(unsigned int pin, unsigned long flags) |
| 86 | { |
| 87 | struct pio_device *pio; |
| 88 | unsigned int pin_index = pin & 0x1f; |
| 89 | u32 mask = 1 << pin_index; |
| 90 | |
| 91 | pio = gpio_to_pio(pin); |
| 92 | if (unlikely(!pio)) { |
| 93 | printk("pio: invalid pin %u\n", pin); |
| 94 | goto fail; |
| 95 | } |
| 96 | |
| 97 | if (unlikely(test_and_set_bit(pin_index, &pio->pinmux_mask))) { |
| 98 | printk("%s: pin %u is busy\n", pio->name, pin_index); |
| 99 | goto fail; |
| 100 | } |
| 101 | |
| 102 | pio_writel(pio, PUER, mask); |
| 103 | if (flags & AT32_GPIOF_HIGH) |
| 104 | pio_writel(pio, SODR, mask); |
| 105 | else |
| 106 | pio_writel(pio, CODR, mask); |
| 107 | if (flags & AT32_GPIOF_OUTPUT) |
| 108 | pio_writel(pio, OER, mask); |
| 109 | else |
| 110 | pio_writel(pio, ODR, mask); |
| 111 | |
| 112 | pio_writel(pio, PER, mask); |
| 113 | if (!(flags & AT32_GPIOF_PULLUP)) |
| 114 | pio_writel(pio, PUDR, mask); |
| 115 | |
| 116 | return; |
| 117 | |
| 118 | fail: |
| 119 | dump_stack(); |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static int __init pio_probe(struct platform_device *pdev) |
| 123 | { |
| 124 | struct pio_device *pio = NULL; |
| 125 | |
| 126 | BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES); |
| 127 | pio = &pio_dev[pdev->id]; |
| 128 | BUG_ON(!pio->regs); |
| 129 | |
| 130 | /* TODO: Interrupts */ |
| 131 | |
| 132 | platform_set_drvdata(pdev, pio); |
| 133 | |
| 134 | printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n", |
| 135 | pio->name, pio->regs, platform_get_irq(pdev, 0)); |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static struct platform_driver pio_driver = { |
| 141 | .probe = pio_probe, |
| 142 | .driver = { |
| 143 | .name = "pio", |
| 144 | }, |
| 145 | }; |
| 146 | |
| 147 | static int __init pio_init(void) |
| 148 | { |
| 149 | return platform_driver_register(&pio_driver); |
| 150 | } |
| 151 | subsys_initcall(pio_init); |
| 152 | |
| 153 | void __init at32_init_pio(struct platform_device *pdev) |
| 154 | { |
| 155 | struct resource *regs; |
| 156 | struct pio_device *pio; |
| 157 | |
| 158 | if (pdev->id > MAX_NR_PIO_DEVICES) { |
| 159 | dev_err(&pdev->dev, "only %d PIO devices supported\n", |
| 160 | MAX_NR_PIO_DEVICES); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | pio = &pio_dev[pdev->id]; |
| 165 | snprintf(pio->name, sizeof(pio->name), "pio%d", pdev->id); |
| 166 | |
| 167 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 168 | if (!regs) { |
| 169 | dev_err(&pdev->dev, "no mmio resource defined\n"); |
| 170 | return; |
| 171 | } |
| 172 | |
| 173 | pio->clk = clk_get(&pdev->dev, "mck"); |
| 174 | if (IS_ERR(pio->clk)) |
| 175 | /* |
| 176 | * This is a fatal error, but if we continue we might |
| 177 | * be so lucky that we manage to initialize the |
| 178 | * console and display this message... |
| 179 | */ |
| 180 | dev_err(&pdev->dev, "no mck clock defined\n"); |
| 181 | else |
| 182 | clk_enable(pio->clk); |
| 183 | |
| 184 | pio->pdev = pdev; |
| 185 | pio->regs = ioremap(regs->start, regs->end - regs->start + 1); |
| 186 | |
| 187 | pio_writel(pio, ODR, ~0UL); |
| 188 | pio_writel(pio, PER, ~0UL); |
| 189 | } |