Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*
 * 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);