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/*
* AMD Geode southbridge support code
* Copyright (C) 2006, Advanced Micro Devices, Inc.
* Copyright (C) 2007, Andres Salomon <dilinger@debian.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <asm/msr.h>
#include <asm/geode.h>
static struct {
char *name;
u32 msr;
int size;
u32 base;
} lbars[] = {
{ "geode-pms", MSR_LBAR_PMS, LBAR_PMS_SIZE, 0 },
{ "geode-acpi", MSR_LBAR_ACPI, LBAR_ACPI_SIZE, 0 },
{ "geode-gpio", MSR_LBAR_GPIO, LBAR_GPIO_SIZE, 0 },
{ "geode-mfgpt", MSR_LBAR_MFGPT, LBAR_MFGPT_SIZE, 0 }
};
static void __init init_lbars(void)
{
u32 lo, hi;
int i;
for (i = 0; i < ARRAY_SIZE(lbars); i++) {
rdmsr(lbars[i].msr, lo, hi);
if (hi & 0x01)
lbars[i].base = lo & 0x0000ffff;
if (lbars[i].base == 0)
printk(KERN_ERR "geode: Couldn't initialize '%s'\n",
lbars[i].name);
}
}
int geode_get_dev_base(unsigned int dev)
{
BUG_ON(dev >= ARRAY_SIZE(lbars));
return lbars[dev].base;
}
EXPORT_SYMBOL_GPL(geode_get_dev_base);
/* === GPIO API === */
void geode_gpio_set(u32 gpio, unsigned int reg)
{
u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
if (!base)
return;
/* low bank register */
if (gpio & 0xFFFF)
outl(gpio & 0xFFFF, base + reg);
/* high bank register */
gpio >>= 16;
if (gpio)
outl(gpio, base + 0x80 + reg);
}
EXPORT_SYMBOL_GPL(geode_gpio_set);
void geode_gpio_clear(u32 gpio, unsigned int reg)
{
u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
if (!base)
return;
/* low bank register */
if (gpio & 0xFFFF)
outl((gpio & 0xFFFF) << 16, base + reg);
/* high bank register */
gpio &= (0xFFFF << 16);
if (gpio)
outl(gpio, base + 0x80 + reg);
}
EXPORT_SYMBOL_GPL(geode_gpio_clear);
int geode_gpio_isset(u32 gpio, unsigned int reg)
{
u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
u32 val;
if (!base)
return 0;
/* low bank register */
if (gpio & 0xFFFF) {
val = inl(base + reg) & (gpio & 0xFFFF);
if ((gpio & 0xFFFF) == val)
return 1;
}
/* high bank register */
gpio >>= 16;
if (gpio) {
val = inl(base + 0x80 + reg) & gpio;
if (gpio == val)
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(geode_gpio_isset);
void geode_gpio_set_irq(unsigned int group, unsigned int irq)
{
u32 lo, hi;
if (group > 7 || irq > 15)
return;
rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
lo &= ~(0xF << (group * 4));
lo |= (irq & 0xF) << (group * 4);
wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
}
EXPORT_SYMBOL_GPL(geode_gpio_set_irq);
void geode_gpio_setup_event(unsigned int gpio, int pair, int pme)
{
u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
u32 offset, shift, val;
if (gpio >= 24)
offset = GPIO_MAP_W;
else if (gpio >= 16)
offset = GPIO_MAP_Z;
else if (gpio >= 8)
offset = GPIO_MAP_Y;
else
offset = GPIO_MAP_X;
shift = (gpio % 8) * 4;
val = inl(base + offset);
/* Clear whatever was there before */
val &= ~(0xF << shift);
/* And set the new value */
val |= ((pair & 7) << shift);
/* Set the PME bit if this is a PME event */
if (pme)
val |= (1 << (shift + 3));
outl(val, base + offset);
}
EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
int geode_has_vsa2(void)
{
static int has_vsa2 = -1;
if (has_vsa2 == -1) {
/*
* The VSA has virtual registers that we can query for a
* signature.
*/
outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
has_vsa2 = (inw(VSA_VRC_DATA) == VSA_SIG);
}
return has_vsa2;
}
EXPORT_SYMBOL_GPL(geode_has_vsa2);
static int __init geode_southbridge_init(void)
{
if (!is_geode())
return -ENODEV;
init_lbars();
(void) mfgpt_timer_setup();
return 0;
}
postcore_initcall(geode_southbridge_init);
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