LXR linux/arch/x86/kernel/geode

   1/*
   2 * AMD Geode southbridge support code
   3 * Copyright (C) 2006, Advanced Micro Devices, Inc.
   4 * Copyright (C) 2007, Andres Salomon <dilinger@debian.org>
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of version 2 of the GNU General Public License
   8 * as published by the Free Software Foundation.
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/ioport.h>
  14#include <linux/io.h>
  15#include <asm/msr.h>
  16#include <asm/geode.h>
  17
  18static struct {
  19        char *name;
  20        u32 msr;
  21        int size;
  22        u32 base;
  23} lbars[] = {
  24        { "geode-pms",   MSR_LBAR_PMS, LBAR_PMS_SIZE, 0 },
  25        { "geode-acpi",  MSR_LBAR_ACPI, LBAR_ACPI_SIZE, 0 },
  26        { "geode-gpio",  MSR_LBAR_GPIO, LBAR_GPIO_SIZE, 0 },
  27        { "geode-mfgpt", MSR_LBAR_MFGPT, LBAR_MFGPT_SIZE, 0 }
  28};
  29
  30static void __init init_lbars(void)
  31{
  32        u32 lo, hi;
  33        int i;
  34
  35        for (i = 0; i < ARRAY_SIZE(lbars); i++) {
  36                rdmsr(lbars[i].msr, lo, hi);
  37                if (hi & 0x01)
  38                        lbars[i].base = lo & 0x0000ffff;
  39
  40                if (lbars[i].base == 0)
  41                        printk(KERN_ERR "geode:  Couldn't initialize '%s'\n",
  42                                        lbars[i].name);
  43        }
  44}
  45
  46int geode_get_dev_base(unsigned int dev)
  47{
  48        BUG_ON(dev >= ARRAY_SIZE(lbars));
  49        return lbars[dev].base;
  50}
  51EXPORT_SYMBOL_GPL(geode_get_dev_base);
  52
  53/* === GPIO API === */
  54
  55void geode_gpio_set(u32 gpio, unsigned int reg)
  56{
  57        u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
  58
  59        if (!base)
  60                return;
  61
  62        /* low bank register */
  63        if (gpio & 0xFFFF)
  64                outl(gpio & 0xFFFF, base + reg);
  65        /* high bank register */
  66        gpio >>= 16;
  67        if (gpio)
  68                outl(gpio, base + 0x80 + reg);
  69}
  70EXPORT_SYMBOL_GPL(geode_gpio_set);
  71
  72void geode_gpio_clear(u32 gpio, unsigned int reg)
  73{
  74        u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
  75
  76        if (!base)
  77                return;
  78
  79        /* low bank register */
  80        if (gpio & 0xFFFF)
  81                outl((gpio & 0xFFFF) << 16, base + reg);
  82        /* high bank register */
  83        gpio &= (0xFFFF << 16);
  84        if (gpio)
  85                outl(gpio, base + 0x80 + reg);
  86}
  87EXPORT_SYMBOL_GPL(geode_gpio_clear);
  88
  89int geode_gpio_isset(u32 gpio, unsigned int reg)
  90{
  91        u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
  92        u32 val;
  93
  94        if (!base)
  95                return 0;
  96
  97        /* low bank register */
  98        if (gpio & 0xFFFF) {
  99                val = inl(base + reg) & (gpio & 0xFFFF);
 100                if ((gpio & 0xFFFF) == val)
 101                        return 1;
 102        }
 103        /* high bank register */
 104        gpio >>= 16;
 105        if (gpio) {
 106                val = inl(base + 0x80 + reg) & gpio;
 107                if (gpio == val)
 108                        return 1;
 109        }
 110        return 0;
 111}
 112EXPORT_SYMBOL_GPL(geode_gpio_isset);
 113
 114void geode_gpio_set_irq(unsigned int group, unsigned int irq)
 115{
 116        u32 lo, hi;
 117
 118        if (group > 7 || irq > 15)
 119                return;
 120
 121        rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
 122
 123        lo &= ~(0xF << (group * 4));
 124        lo |= (irq & 0xF) << (group * 4);
 125
 126        wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
 127}
 128EXPORT_SYMBOL_GPL(geode_gpio_set_irq);
 129
 130void geode_gpio_setup_event(unsigned int gpio, int pair, int pme)
 131{
 132        u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
 133        u32 offset, shift, val;
 134
 135        if (gpio >= 24)
 136                offset = GPIO_MAP_W;
 137        else if (gpio >= 16)
 138                offset = GPIO_MAP_Z;
 139        else if (gpio >= 8)
 140                offset = GPIO_MAP_Y;
 141        else
 142                offset = GPIO_MAP_X;
 143
 144        shift = (gpio % 8) * 4;
 145
 146        val = inl(base + offset);
 147
 148        /* Clear whatever was there before */
 149        val &= ~(0xF << shift);
 150
 151        /* And set the new value */
 152
 153        val |= ((pair & 7) << shift);
 154
 155        /* Set the PME bit if this is a PME event */
 156
 157        if (pme)
 158                val |= (1 << (shift + 3));
 159
 160        outl(val, base + offset);
 161}
 162EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
 163
 164int geode_has_vsa2(void)
 165{
 166        static int has_vsa2 = -1;
 167
 168        if (has_vsa2 == -1) {
 169                u16 val;
 170
 171                /*
 172                 * The VSA has virtual registers that we can query for a
 173                 * signature.
 174                 */
 175                outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
 176                outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
 177
 178                val = inw(VSA_VRC_DATA);
 179                has_vsa2 = (val == AMD_VSA_SIG || val == GSW_VSA_SIG);
 180        }
 181
 182        return has_vsa2;
 183}
 184EXPORT_SYMBOL_GPL(geode_has_vsa2);
 185
 186static int __init geode_southbridge_init(void)
 187{
 188        if (!is_geode())
 189                return -ENODEV;
 190
 191        init_lbars();
 192        (void) mfgpt_timer_setup();
 193        return 0;
 194}
 195
 196postcore_initcall(geode_southbridge_init);
 197