arch/x86/kernel/geode_32.c

   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
  18 static 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
  30 static 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
  46 int geode_get_dev_base(unsigned int dev)
  47 {
  48         BUG_ON(dev >= ARRAY_SIZE(lbars));
  49         return lbars[dev].base;
  50 }
  51 EXPORT_SYMBOL_GPL(geode_get_dev_base);
  52
  53 /* === GPIO API === */
  54
  55 void 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 }
  70 EXPORT_SYMBOL_GPL(geode_gpio_set);
  71
  72 void 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 }
  87 EXPORT_SYMBOL_GPL(geode_gpio_clear);
  88
  89 int 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 }
 112 EXPORT_SYMBOL_GPL(geode_gpio_isset);
 113
 114 void 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 }
 128 EXPORT_SYMBOL_GPL(geode_gpio_set_irq);
 129
 130 void 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 }
 162 EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
 163
 164 int geode_has_vsa2(void)
 165 {
 166         static int has_vsa2 = -1;
 167
 168         if (has_vsa2 == -1) {
 169                 /*
 170                  * The VSA has virtual registers that we can query for a
 171                  * signature.
 172                  */
 173                 outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
 174                 outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
 175
 176                 has_vsa2 = (inw(VSA_VRC_DATA) == VSA_SIG);
 177         }
 178
 179         return has_vsa2;
 180 }
 181 EXPORT_SYMBOL_GPL(geode_has_vsa2);
 182
 183 static int __init geode_southbridge_init(void)
 184 {
 185         if (!is_geode())
 186                 return -ENODEV;
 187
 188         init_lbars();
 189         (void) mfgpt_timer_setup();
 190         return 0;
 191 }
 192
 193 postcore_initcall(geode_southbridge_init);