83d7384f8d
This adds support for Multi-Function General Purpose Timers. It detects the available timers during southbridge init, and provides an API for allocating and setting the timers. They're higher resolution than the standard PIT, so the MFGPTs come in handy for quite a few things. Note that we never clobber the timers that the BIOS might have opted to use; we just check for unused timers. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by: Andres Salomon <dilinger@debian.org> Cc: Andi Kleen <ak@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
159 lines
3.2 KiB
C
159 lines
3.2 KiB
C
/*
|
|
* AMD Geode southbridge support code
|
|
* Copyright (C) 2006, Advanced Micro Devices, Inc.
|
|
*
|
|
* 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(unsigned int gpio, unsigned int reg)
|
|
{
|
|
u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
|
|
|
|
if (!base)
|
|
return;
|
|
|
|
if (gpio < 16)
|
|
outl(1 << gpio, base + reg);
|
|
else
|
|
outl(1 << (gpio - 16), base + 0x80 + reg);
|
|
}
|
|
EXPORT_SYMBOL_GPL(geode_gpio_set);
|
|
|
|
void geode_gpio_clear(unsigned int gpio, unsigned int reg)
|
|
{
|
|
u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
|
|
|
|
if (!base)
|
|
return;
|
|
|
|
if (gpio < 16)
|
|
outl(1 << (gpio + 16), base + reg);
|
|
else
|
|
outl(1 << gpio, base + 0x80 + reg);
|
|
}
|
|
EXPORT_SYMBOL_GPL(geode_gpio_clear);
|
|
|
|
int geode_gpio_isset(unsigned int gpio, unsigned int reg)
|
|
{
|
|
u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
|
|
|
|
if (!base)
|
|
return 0;
|
|
|
|
if (gpio < 16)
|
|
return (inl(base + reg) & (1 << gpio)) ? 1 : 0;
|
|
else
|
|
return (inl(base + 0x80 + reg) & (1 << (gpio - 16))) ? 1 : 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);
|
|
|
|
static int __init geode_southbridge_init(void)
|
|
{
|
|
int timers;
|
|
|
|
if (!is_geode())
|
|
return -ENODEV;
|
|
|
|
init_lbars();
|
|
timers = geode_mfgpt_detect();
|
|
printk(KERN_INFO "geode: %d MFGPT timers available.\n", timers);
|
|
return 0;
|
|
}
|
|
|
|
postcore_initcall(geode_southbridge_init);
|