| 1 | /* |
| 2 | * AMD Geode southbridge support code |
| 3 | * Copyright (C) 2006, Advanced Micro Devices, Inc. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of version 2 of the GNU General Public License |
| 7 | * as published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/ioport.h> |
| 13 | #include <linux/io.h> |
| 14 | #include <asm/msr.h> |
| 15 | #include <asm/geode.h> |
| 16 | |
| 17 | static struct { |
| 18 | char *name; |
| 19 | u32 msr; |
| 20 | int size; |
| 21 | u32 base; |
| 22 | } lbars[] = { |
| 23 | { "geode-pms", MSR_LBAR_PMS, LBAR_PMS_SIZE, 0 }, |
| 24 | { "geode-acpi", MSR_LBAR_ACPI, LBAR_ACPI_SIZE, 0 }, |
| 25 | { "geode-gpio", MSR_LBAR_GPIO, LBAR_GPIO_SIZE, 0 }, |
| 26 | { "geode-mfgpt", MSR_LBAR_MFGPT, LBAR_MFGPT_SIZE, 0 } |
| 27 | }; |
| 28 | |
| 29 | static void __init init_lbars(void) |
| 30 | { |
| 31 | u32 lo, hi; |
| 32 | int i; |
| 33 | |
| 34 | for (i = 0; i < ARRAY_SIZE(lbars); i++) { |
| 35 | rdmsr(lbars[i].msr, lo, hi); |
| 36 | if (hi & 0x01) |
| 37 | lbars[i].base = lo & 0x0000ffff; |
| 38 | |
| 39 | if (lbars[i].base == 0) |
| 40 | printk(KERN_ERR "geode: Couldn't initialize '%s'\n", |
| 41 | lbars[i].name); |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | int geode_get_dev_base(unsigned int dev) |
| 46 | { |
| 47 | BUG_ON(dev >= ARRAY_SIZE(lbars)); |
| 48 | return lbars[dev].base; |
| 49 | } |
| 50 | EXPORT_SYMBOL_GPL(geode_get_dev_base); |
| 51 | |
| 52 | /* === GPIO API === */ |
| 53 | |
| 54 | void geode_gpio_set(unsigned int gpio, unsigned int reg) |
| 55 | { |
| 56 | u32 base = geode_get_dev_base(GEODE_DEV_GPIO); |
| 57 | |
| 58 | if (!base) |
| 59 | return; |
| 60 | |
| 61 | if (gpio < 16) |
| 62 | outl(1 << gpio, base + reg); |
| 63 | else |
| 64 | outl(1 << (gpio - 16), base + 0x80 + reg); |
| 65 | } |
| 66 | EXPORT_SYMBOL_GPL(geode_gpio_set); |
| 67 | |
| 68 | void geode_gpio_clear(unsigned int gpio, unsigned int reg) |
| 69 | { |
| 70 | u32 base = geode_get_dev_base(GEODE_DEV_GPIO); |
| 71 | |
| 72 | if (!base) |
| 73 | return; |
| 74 | |
| 75 | if (gpio < 16) |
| 76 | outl(1 << (gpio + 16), base + reg); |
| 77 | else |
| 78 | outl(1 << gpio, base + 0x80 + reg); |
| 79 | } |
| 80 | EXPORT_SYMBOL_GPL(geode_gpio_clear); |
| 81 | |
| 82 | int geode_gpio_isset(unsigned int gpio, unsigned int reg) |
| 83 | { |
| 84 | u32 base = geode_get_dev_base(GEODE_DEV_GPIO); |
| 85 | |
| 86 | if (!base) |
| 87 | return 0; |
| 88 | |
| 89 | if (gpio < 16) |
| 90 | return (inl(base + reg) & (1 << gpio)) ? 1 : 0; |
| 91 | else |
| 92 | return (inl(base + 0x80 + reg) & (1 << (gpio - 16))) ? 1 : 0; |
| 93 | } |
| 94 | EXPORT_SYMBOL_GPL(geode_gpio_isset); |
| 95 | |
| 96 | void geode_gpio_set_irq(unsigned int group, unsigned int irq) |
| 97 | { |
| 98 | u32 lo, hi; |
| 99 | |
| 100 | if (group > 7 || irq > 15) |
| 101 | return; |
| 102 | |
| 103 | rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi); |
| 104 | |
| 105 | lo &= ~(0xF << (group * 4)); |
| 106 | lo |= (irq & 0xF) << (group * 4); |
| 107 | |
| 108 | wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi); |
| 109 | } |
| 110 | EXPORT_SYMBOL_GPL(geode_gpio_set_irq); |
| 111 | |
| 112 | void geode_gpio_setup_event(unsigned int gpio, int pair, int pme) |
| 113 | { |
| 114 | u32 base = geode_get_dev_base(GEODE_DEV_GPIO); |
| 115 | u32 offset, shift, val; |
| 116 | |
| 117 | if (gpio >= 24) |
| 118 | offset = GPIO_MAP_W; |
| 119 | else if (gpio >= 16) |
| 120 | offset = GPIO_MAP_Z; |
| 121 | else if (gpio >= 8) |
| 122 | offset = GPIO_MAP_Y; |
| 123 | else |
| 124 | offset = GPIO_MAP_X; |
| 125 | |
| 126 | shift = (gpio % 8) * 4; |
| 127 | |
| 128 | val = inl(base + offset); |
| 129 | |
| 130 | /* Clear whatever was there before */ |
| 131 | val &= ~(0xF << shift); |
| 132 | |
| 133 | /* And set the new value */ |
| 134 | |
| 135 | val |= ((pair & 7) << shift); |
| 136 | |
| 137 | /* Set the PME bit if this is a PME event */ |
| 138 | |
| 139 | if (pme) |
| 140 | val |= (1 << (shift + 3)); |
| 141 | |
| 142 | outl(val, base + offset); |
| 143 | } |
| 144 | EXPORT_SYMBOL_GPL(geode_gpio_setup_event); |
| 145 | |
| 146 | static int __init geode_southbridge_init(void) |
| 147 | { |
| 148 | int timers; |
| 149 | |
| 150 | if (!is_geode()) |
| 151 | return -ENODEV; |
| 152 | |
| 153 | init_lbars(); |
| 154 | timers = geode_mfgpt_detect(); |
| 155 | printk(KERN_INFO "geode: %d MFGPT timers available.\n", timers); |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | postcore_initcall(geode_southbridge_init); |