From 96631f941dc3e958585cc4798d3c7c74c032c7bd Mon Sep 17 00:00:00 2001 From: Po Xu Date: Sun, 16 Sep 2018 13:27:44 +0800 Subject: mediatek/mt8183: Add AUXADC driver We plan to get board id and RAM code from AUXADC on Kukui. Add AUXADC driver to support it. BUG=b:80501386 BRANCH=none TEST=Boots correctly on Kukui Change-Id: I121a6a0240f9c517c0cbc07e0c18b09167849ff1 Signed-off-by: Po Xu Reviewed-on: https://review.coreboot.org/29061 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner --- src/soc/mediatek/mt8183/Makefile.inc | 4 ++ src/soc/mediatek/mt8183/auxadc.c | 68 ++++++++++++++++++++++++ src/soc/mediatek/mt8183/include/soc/addressmap.h | 1 + src/soc/mediatek/mt8183/include/soc/auxadc.h | 34 ++++++++++++ 4 files changed, 107 insertions(+) create mode 100644 src/soc/mediatek/mt8183/auxadc.c create mode 100644 src/soc/mediatek/mt8183/include/soc/auxadc.h diff --git a/src/soc/mediatek/mt8183/Makefile.inc b/src/soc/mediatek/mt8183/Makefile.inc index 5650465ef3..944c9b1d18 100644 --- a/src/soc/mediatek/mt8183/Makefile.inc +++ b/src/soc/mediatek/mt8183/Makefile.inc @@ -1,5 +1,6 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8183),y) +bootblock-y += auxadc.c bootblock-y += bootblock.c bootblock-y += ../common/gpio.c gpio.c bootblock-y += ../common/pll.c pll.c @@ -14,12 +15,14 @@ decompressor-y += decompressor.c decompressor-y += ../common/mmu_operations.c decompressor-y += ../common/timer.c +verstage-y += auxadc.c verstage-y += ../common/gpio.c gpio.c verstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c verstage-y += ../common/timer.c verstage-$(CONFIG_DRIVERS_UART) += ../common/uart.c verstage-y += ../common/wdt.c +romstage-y += auxadc.c romstage-y += ../common/cbmem.c emi.c romstage-y += dramc_init_setting.c romstage-y += memory.c @@ -30,6 +33,7 @@ romstage-y += ../common/timer.c romstage-$(CONFIG_DRIVERS_UART) += ../common/uart.c romstage-y += ../common/wdt.c +ramstage-y += auxadc.c ramstage-y += ../common/cbmem.c emi.c ramstage-y += ../common/gpio.c gpio.c ramstage-y += ../common/mmu_operations.c mmu_operations.c diff --git a/src/soc/mediatek/mt8183/auxadc.c b/src/soc/mediatek/mt8183/auxadc.c new file mode 100644 index 0000000000..af88efb3b9 --- /dev/null +++ b/src/soc/mediatek/mt8183/auxadc.c @@ -0,0 +1,68 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include + +static struct mtk_auxadc_regs *const mtk_auxadc = (void *)AUXADC_BASE; + +/* + * Wait until a condition becomes true or times out + * + * cond : a C expression to wait for + * timeout : msecs + */ +#define wait_ms(cond, timeout) \ +({ \ + struct stopwatch sw; \ + int expired = 0; \ + stopwatch_init_msecs_expire(&sw, timeout); \ + while (!(cond) && !(expired = stopwatch_expired(&sw))) \ + ; /* wait */ \ + assert(!expired); \ +}) + +static uint32_t auxadc_get_rawdata(int channel) +{ + setbits_le32(&mt8183_infracfg->module_sw_cg_1_clr, 1 << 10); + wait_ms(!(read32(&mtk_auxadc->con2) & 0x1), 300); + + clrbits_le32(&mtk_auxadc->con1, 1 << channel); + wait_ms(!(read32(&mtk_auxadc->data[channel]) & (1 << 12)), 300); + + setbits_le32(&mtk_auxadc->con1, 1 << channel); + udelay(25); + wait_ms(read32(&mtk_auxadc->data[channel]) & (1 << 12), 300); + + 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); +} diff --git a/src/soc/mediatek/mt8183/include/soc/addressmap.h b/src/soc/mediatek/mt8183/include/soc/addressmap.h index 1ba9cc88ee..cee9bd8160 100644 --- a/src/soc/mediatek/mt8183/include/soc/addressmap.h +++ b/src/soc/mediatek/mt8183/include/soc/addressmap.h @@ -32,6 +32,7 @@ enum { EMI_BASE = IO_PHYS + 0x00219000, EMI_MPU_BASE = IO_PHYS + 0x00226000, DRAMC_CH_BASE = IO_PHYS + 0x00228000, + AUXADC_BASE = IO_PHYS + 0x01001000, UART0_BASE = IO_PHYS + 0x01002000, SPI0_BASE = IO_PHYS + 0x0100A000, SPI1_BASE = IO_PHYS + 0x01010000, diff --git a/src/soc/mediatek/mt8183/include/soc/auxadc.h b/src/soc/mediatek/mt8183/include/soc/auxadc.h new file mode 100644 index 0000000000..aafc8a1df4 --- /dev/null +++ b/src/soc/mediatek/mt8183/include/soc/auxadc.h @@ -0,0 +1,34 @@ +/* + * 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. + */ + +#ifndef _MTK_ADC_H +#define _MTK_ADC_H + +#include + +typedef struct mtk_auxadc_regs { + uint32_t con0; + uint32_t con1; + uint32_t con1_set; + uint32_t con1_clr; + uint32_t con2; + uint32_t data[16]; + uint32_t reserved[16]; + uint32_t misc; +} mtk_auxadc_regs; + +/* Return voltage in uVolt */ +int auxadc_get_voltage(unsigned int channel); +#endif -- cgit v1.2.3