soc/mediatek/mt8195: add mt6691 driver

Add mt6691 buck control for DRAM to run fast calibration test.
It is needed to get and set voltage during testing.

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Change-Id: I4fb9f7245d44383a6a3a0cf8d00f7f503cbdeb06
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55575
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
henryc.chen 2021-03-04 09:44:42 +08:00 committed by Hung-Te Lin
parent f2c259cf2a
commit 21e4bd4e8c
3 changed files with 112 additions and 0 deletions

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@ -45,6 +45,7 @@ romstage-y += ../common/pmif_spi.c pmif_spi.c
romstage-y += ../common/pmif_spmi.c pmif_spmi.c romstage-y += ../common/pmif_spmi.c pmif_spmi.c
romstage-y += ../common/mt6315.c mt6315.c romstage-y += ../common/mt6315.c mt6315.c
romstage-y += ../common/mt6359p.c mt6359p.c romstage-y += ../common/mt6359p.c mt6359p.c
romstage-y += mt6691.c
romstage-y += ../common/rtc.c ../common/rtc_osc_init.c ../common/rtc_mt6359p.c romstage-y += ../common/rtc.c ../common/rtc_osc_init.c ../common/rtc_mt6359p.c
ramstage-y += ../common/auxadc.c ramstage-y += ../common/auxadc.c

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@ -0,0 +1,37 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __SOC_MEDIATEK_MT8195_MT6691_H__
#define __SOC_MEDIATEK_MT8195_MT6691_H__
#include <stdint.h>
void mt6691_probe(uint8_t i2c_num);
int mt6691_set_voltage(uint8_t i2c_num, unsigned int volt_uv);
int mt6691_get_voltage(uint8_t i2c_num);
#define MT6691_CID_CODE 0x01
#define MT6691_VDD2_ID 0x0000
#define MT6691_VDDQ_ID 0x0000
#define MT6691_PGOOD_SHIFT 7
#define MT6691_DN_SR_MASK 0x7
#define MT6691_DN_SR_SHIFT 5
enum {
/* Voltage setting */
MT6691_VSEL0 = 0x00,
MT6691_VSEL1 = 0x01,
/* Control register */
MT6691_CONTROL = 0x02,
/* IC Type */
MT6691_ID1 = 0x03,
/* IC mask version */
MT6691_ID2 = 0x04,
/* Monitor register */
MT6691_MONITOR = 0x05,
MT6691_CTRL2 = 0x06,
MT6691_CTRL3 = 0x07,
MT6691_CTRL4 = 0x08,
};
#endif

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@ -0,0 +1,74 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/i2c_simple.h>
#include <soc/mt6691.h>
#define MT6691_MIN_VOLTAGE 300000
#define MT6691_MAX_VOLTAGE 1300000
#define MT6691_STEP_UV 5000
enum {
MT6691_SLAVE_ADDR = 0x51,
};
int mt6691_set_voltage(uint8_t i2c_num, unsigned int volt_uv)
{
uint8_t selector;
if (volt_uv > MT6691_MAX_VOLTAGE || volt_uv < MT6691_MIN_VOLTAGE) {
printk(BIOS_ERR, "%s: voltage out of range\n", __func__);
return -1;
}
selector = DIV_ROUND_UP(volt_uv - MT6691_MIN_VOLTAGE, MT6691_STEP_UV);
return i2c_write_field(i2c_num, MT6691_SLAVE_ADDR,
MT6691_VSEL0, selector, 0xFF, 0);
}
int mt6691_get_voltage(uint8_t i2c_num)
{
uint8_t selector = 0;
unsigned int volt;
if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_VSEL0,
&selector, 0xFF, 0) < 0) {
printk(BIOS_ERR, "%s: failed to get voltage from i2c\n", __func__);
return -1;
}
volt = (selector * MT6691_STEP_UV) + MT6691_MIN_VOLTAGE;
if (volt > MT6691_MAX_VOLTAGE) {
printk(BIOS_ERR, "%s: voltage out of range\n", __func__);
return -1;
}
return volt;
}
static uint8_t get_mt6691_chip_id(uint8_t i2c_num)
{
uint8_t id;
if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_MONITOR,
&id, 0x1, MT6691_PGOOD_SHIFT) < 0) {
printk(BIOS_ERR, "%s: failed to read from i2c", __func__);
return 0;
}
return id;
}
void mt6691_probe(uint8_t i2c_num)
{
/* Check device ID is MT6691 */
if (!get_mt6691_chip_id(i2c_num)) {
printk(BIOS_ERR, "ERROR: unknown MT6691 chip_id\n");
return;
}
/* Slew rate 12mV */
i2c_write_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_CTRL2, 0x1,
MT6691_DN_SR_MASK, MT6691_DN_SR_SHIFT);
}