| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2018 MediaTek 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. |
| */ |
| |
| #include <arch/io.h> |
| #include <assert.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <soc/addressmap.h> |
| #include <soc/auxadc.h> |
| #include <soc/infracfg.h> |
| #include <timer.h> |
| |
| static struct mtk_auxadc_regs *const mtk_auxadc = (void *)AUXADC_BASE; |
| |
| static uint32_t auxadc_get_rawdata(int channel) |
| { |
| setbits_le32(&mt8183_infracfg->module_sw_cg_1_clr, 1 << 10); |
| assert(wait_ms(300, !(read32(&mtk_auxadc->con2) & 0x1))); |
| |
| clrbits_le32(&mtk_auxadc->con1, 1 << channel); |
| assert(wait_ms(300, !(read32(&mtk_auxadc->data[channel]) & (1 << 12)))); |
| |
| setbits_le32(&mtk_auxadc->con1, 1 << channel); |
| udelay(25); |
| assert(wait_ms(300, read32(&mtk_auxadc->data[channel]) & (1 << 12))); |
| |
| uint32_t value = read32(&mtk_auxadc->data[channel]) & 0x0FFF; |
| |
| setbits_le32(&mt8183_infracfg->module_sw_cg_1_set, 1 << 10); |
| |
| return value; |
| } |
| |
| int auxadc_get_voltage(unsigned int channel) |
| { |
| assert(channel < 16); |
| |
| /* 1.5V in 4096 steps */ |
| return (int)((int64_t)auxadc_get_rawdata(channel) * 1500000 / 4096); |
| } |