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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdint.h>
#include <string.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/pci.h>
#include "pch.h"
#include "lp_gpio.h"
static u16 get_gpio_base(void)
{
#if defined(__PRE_RAM__) || defined(__SMM__)
return pci_read_config16(PCH_LPC_DEV, GPIO_BASE) & 0xfffc;
#else
return pci_read_config16(pcidev_on_root(0x1f, 0),
GPIO_BASE) & 0xfffc;
#endif
}
/*
* This function will return a number that indicates which PIRQ
* this GPIO maps to. If this is not a PIRQ capable GPIO then
* it will return -1. The GPIO to PIRQ mapping is not linear.
*/
static int lp_gpio_to_pirq(int gpio)
{
switch (gpio) {
case 8: return 0; /* PIRQI */
case 9: return 1; /* PIRQJ */
case 10: return 2; /* PIRQK */
case 13: return 3; /* PIRQL */
case 14: return 4; /* PIRQM */
case 45: return 5; /* PIRQN */
case 46: return 6; /* PIRQO */
case 47: return 7; /* PIRQP */
case 48: return 8; /* PIRQQ */
case 49: return 9; /* PIRQR */
case 50: return 10; /* PIRQS */
case 51: return 11; /* PIRQT */
case 52: return 12; /* PIRQU */
case 53: return 13; /* PIRQV */
case 54: return 14; /* PIRQW */
case 55: return 15; /* PIRQX */
default: return -1;
};
}
void setup_pch_lp_gpios(const struct pch_lp_gpio_map map[])
{
u16 gpio_base = get_gpio_base();
const struct pch_lp_gpio_map *config;
u32 owner[3] = {0};
u32 route[3] = {0};
u32 irqen[3] = {0};
u32 reset[3] = {0};
u32 blink = 0;
u16 pirq2apic = 0;
int set, bit, gpio = 0;
for (config = map; config->conf0 != GPIO_LIST_END; config++, gpio++) {
if (gpio > MAX_GPIO_NUMBER)
break;
/* Setup Configuration registers 1 and 2 */
outl(config->conf0, gpio_base + GPIO_CONFIG0(gpio));
outl(config->conf1, gpio_base + GPIO_CONFIG1(gpio));
/* Determine set and bit based on GPIO number */
set = gpio >> 5;
bit = gpio % 32;
/* Apply settings to set specific bits */
owner[set] |= config->owner << bit;
route[set] |= config->route << bit;
irqen[set] |= config->irqen << bit;
reset[set] |= config->reset << bit;
if (set == 0)
blink |= config->blink << bit;
/* PIRQ to IO-APIC map */
if (config->pirq == GPIO_PIRQ_APIC_ROUTE) {
set = lp_gpio_to_pirq(gpio);
if (set >= 0)
pirq2apic |= 1 << set;
}
}
for (set = 0; set <= 2; set++) {
outl(owner[set], gpio_base + GPIO_OWNER(set));
outl(route[set], gpio_base + GPIO_ROUTE(set));
outl(irqen[set], gpio_base + GPIO_IRQ_IE(set));
outl(reset[set], gpio_base + GPIO_RESET(set));
}
outl(blink, gpio_base + GPIO_BLINK);
outl(pirq2apic, gpio_base + GPIO_PIRQ_APIC_EN);
}
int get_gpio(int gpio_num)
{
u16 gpio_base = get_gpio_base();
if (gpio_num > MAX_GPIO_NUMBER)
return 0;
return !!(inl(gpio_base + GPIO_CONFIG0(gpio_num)) & GPI_LEVEL);
}
/*
* get a number comprised of multiple GPIO values. gpio_num_array points to
* the array of gpio pin numbers to scan, terminated by -1.
*/
unsigned get_gpios(const int *gpio_num_array)
{
int gpio;
unsigned bitmask = 1;
unsigned vector = 0;
while (bitmask &&
((gpio = *gpio_num_array++) != -1)) {
if (get_gpio(gpio))
vector |= bitmask;
bitmask <<= 1;
}
return vector;
}
void set_gpio(int gpio_num, int value)
{
u16 gpio_base = get_gpio_base();
u32 conf0;
if (gpio_num > MAX_GPIO_NUMBER)
return;
conf0 = inl(gpio_base + GPIO_CONFIG0(gpio_num));
conf0 &= ~GPO_LEVEL_MASK;
conf0 |= value << GPO_LEVEL_SHIFT;
outl(conf0, gpio_base + GPIO_CONFIG0(gpio_num));
}
int gpio_is_native(int gpio_num)
{
u16 gpio_base = get_gpio_base();
return !(inl(gpio_base + GPIO_CONFIG0(gpio_num)) & 1);
}
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