arch/x86/kernel/geode_32.c

   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);