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/*
* This file is part of the coreboot project.
*
* Copyright 2014 Rockchip Inc.
*
* 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 <assert.h>
#include <console/console.h>
#include <device/i2c.h>
#include <stdint.h>
#include <stdlib.h>
#include <delay.h>
#include "rk808.h"
#define RK808_ADDR 0x1b
#define DCDC_EN 0x23
#define LDO_EN 0x24
#define BUCK1SEL 0x2f
#define BUCK4SEL 0x38
#define LDO_ONSEL(i) (0x39 + 2 * i)
#define LDO_SLPSEL(i) (0x3a + 2 * i)
static void rk808_clrsetbits(uint8_t bus, uint8_t reg, uint8_t clr, uint8_t set)
{
uint8_t value;
if (i2c_readb(bus, RK808_ADDR, reg, &value) ||
i2c_writeb(bus, RK808_ADDR, reg, (value & ~clr) | set))
printk(BIOS_ERR, "ERROR: Cannot set Rk808[%#x]!\n", reg);
}
void rk808_configure_switch(uint8_t bus, int sw, int enabled)
{
assert(sw == 1 || sw == 2);
rk808_clrsetbits(bus, DCDC_EN, 1 << (sw + 4), !!enabled << (sw + 4));
}
void rk808_configure_ldo(uint8_t bus, int ldo, int millivolts)
{
uint8_t vsel;
switch (ldo) {
case 1:
case 2:
case 4:
case 5:
case 8:
vsel = div_round_up(millivolts, 100) - 18;
break;
case 3:
case 6:
case 7:
vsel = div_round_up(millivolts, 100) - 8;
break;
default:
die("Unknown LDO index!");
}
assert(vsel <= 0x10);
rk808_clrsetbits(bus, LDO_ONSEL(ldo), 0x1f, vsel);
rk808_clrsetbits(bus, LDO_EN, 0, 1 << (ldo - 1));
}
void rk808_configure_buck(uint8_t bus, int buck, int millivolts)
{
uint8_t vsel;
uint8_t buck_reg;
switch (buck) {
case 1:
case 2:
/*base on 725mv, use 25mv step */
vsel = (div_round_up(millivolts, 25) - 29) * 2 + 1;
assert(vsel <= 0x3f);
buck_reg = BUCK1SEL + 4 * (buck - 1);
break;
case 4:
vsel = div_round_up(millivolts, 100) - 18;
assert(vsel <= 0xf);
buck_reg = BUCK4SEL;
break;
default:
die("fault buck index!");
}
rk808_clrsetbits(bus, buck_reg, 0x3f, vsel);
rk808_clrsetbits(bus, DCDC_EN, 0, 1 << (buck - 1));
udelay(225);/* Must wait for voltage to stabilize */
}
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