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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
* Copyright (c) 2013, NVIDIA CORPORATION. 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <console/console.h>
#include <delay.h>
#include <device/i2c.h>
#include <stdint.h>
#include <stdlib.h>
#include "pmic.h"
#include "reset.h"
#define PAGE_ADDR(reg) ((reg >> 8) & 0xff)
#define PAGE_OFFSET(reg) (reg & 0xff)
struct ti65913_init_reg {
u16 reg;
u8 val;
u8 delay;
};
static struct ti65913_init_reg init_list[] = {
//TODO(twarren@nvidia.com): Add slams back to defaults
// {TI65913_SMPS12_VOLTAGE, 0x38, 0},
// {TI65913_SMPS12_CTRL, 0x01, 1},
//etc.
};
int pmic_read_reg(unsigned bus, uint16_t reg, uint8_t *data)
{
if (i2c_readb(bus, PAGE_ADDR(reg), PAGE_OFFSET(reg), data)) {
printk(BIOS_ERR, "%s: page = 0x%02X, reg = 0x%02X failed!\n",
__func__, PAGE_ADDR(reg), PAGE_OFFSET(reg));
return -1;
}
return 0;
}
void pmic_write_reg(unsigned bus, uint16_t reg, uint8_t val, int delay)
{
if (i2c_writeb(bus, PAGE_ADDR(reg), PAGE_OFFSET(reg), val)) {
printk(BIOS_ERR, "%s: page = 0x%02X, reg = 0x%02X, "
"value = 0x%02X failed!\n",
__func__, PAGE_ADDR(reg), PAGE_OFFSET(reg), val);
/* Reset the SoC on any PMIC write error */
cpu_reset();
} else {
if (delay)
udelay(500);
}
}
static void pmic_slam_defaults(unsigned bus)
{
int i;
for (i = 0; i < ARRAY_SIZE(init_list); i++) {
struct ti65913_init_reg *reg = &init_list[i];
pmic_write_reg(bus, reg->reg, reg->val, reg->delay);
}
}
void pmic_init(unsigned bus)
{
/* Restore PMIC POR defaults, in case kernel changed 'em */
pmic_slam_defaults(bus);
/* A44: Set VDD_CPU to 1.0V. */
pmic_write_reg(bus, TI65913_SMPS12_VOLTAGE, 0x38, 0);
pmic_write_reg(bus, TI65913_SMPS12_CTRL, 0x01, 1);
printk(BIOS_DEBUG, "PMIC init done\n");
}
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