| /* |
| * 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 <delay.h> |
| #include <device/i2c.h> |
| #include <soc/rk808.h> |
| #include <stdint.h> |
| #include <stdlib.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 */ |
| } |