From 66532b0ba7616fdc2ab487ef395c2acf0b5bcac3 Mon Sep 17 00:00:00 2001 From: Qii Wang Date: Fri, 18 Jan 2019 09:29:09 +0800 Subject: mediatek/mt8183: Add I2C driver code This patch implements i2c driver for MT8183. BUG=b:80501386 BRANCH=none TEST=Boot correctly on kukui. Change-Id: I0a4d78b494819f45951f78e5a618021000cf3463 Signed-off-by: Qii Wang Reviewed-on: https://review.coreboot.org/c/coreboot/+/30976 Reviewed-by: Hung-Te Lin Reviewed-by: Julius Werner Tested-by: build bot (Jenkins) --- src/soc/mediatek/mt8183/i2c.c | 150 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 150 insertions(+) create mode 100644 src/soc/mediatek/mt8183/i2c.c (limited to 'src/soc/mediatek/mt8183/i2c.c') diff --git a/src/soc/mediatek/mt8183/i2c.c b/src/soc/mediatek/mt8183/i2c.c new file mode 100644 index 0000000000..a70c5e175d --- /dev/null +++ b/src/soc/mediatek/mt8183/i2c.c @@ -0,0 +1,150 @@ +/* + * 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 + +#define I2C_CLK_HZ (UNIVPLL_HZ / 20) + +struct mtk_i2c mtk_i2c_bus_controller[] = { + /* i2c0 setting */ + { + .i2c_regs = (void *)(I2C_BASE + 0x2000), + .i2c_dma_regs = (void *)(I2C_DMA_BASE), + }, + + /* i2c1 setting */ + { + .i2c_regs = (void *)(I2C_BASE + 0xc000), + .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x400), + }, + + /* i2c2 setting */ + { + .i2c_regs = (void *)(I2C_BASE + 0x4000), + .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x200), + }, + + /* i2c3 setting */ + { + .i2c_regs = (void *)(I2C_BASE + 0xa000), + .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x380), + }, + + /* i2c4 setting */ + { + .i2c_regs = (void *)(I2C_BASE + 0x3000), + .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x80), + }, + + /* i2c5 setting */ + { + .i2c_regs = (void *)(I2C_BASE + 0x11000), + .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x480), + }, + + /* i2c6 setting */ + { + .i2c_regs = (void *)(I2C_BASE), + .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x580), + }, +}; + +#define I2C_BUS_NUMBER ARRAY_SIZE(mtk_i2c_bus_controller) + +struct pad_func { + gpio_t gpio; + u8 func; +}; + +#define PAD_FUNC(name, func) {GPIO(name), PAD_##name##_FUNC_##func} + +static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = { + { + PAD_FUNC(SDA0, SDA0), + PAD_FUNC(SCL0, SCL0), + }, + { + PAD_FUNC(SDA1, SDA1), + PAD_FUNC(SCL1, SCL1), + }, + { + PAD_FUNC(SDA2, SDA2), + PAD_FUNC(SCL2, SCL2), + }, + { + PAD_FUNC(SDA3, SDA3), + PAD_FUNC(SCL3, SCL3), + }, + { + PAD_FUNC(SDA4, SDA4), + PAD_FUNC(SCL4, SCL4), + }, + { + PAD_FUNC(SDA5, SDA5), + PAD_FUNC(SCL5, SCL5), + }, + { + PAD_FUNC(SDA6, SDA6), + PAD_FUNC(SCL6, SCL6), + }, +}; + +static void mtk_i2c_set_gpio_pinmux(uint8_t bus) +{ + assert(bus < I2C_BUS_NUMBER); + + const struct pad_func *ptr = i2c_funcs[bus]; + for (size_t i = 0; i < 2; i++) { + gpio_set_mode(ptr[i].gpio, ptr[i].func); + gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP); + } +} + +static void mtk_i2c_speed_init(uint8_t bus) +{ + uint8_t step_div; + const uint8_t clock_div = 5; + const uint8_t sample_div = 1; + uint32_t i2c_freq; + + assert(bus < ARRAY_SIZE(mtk_i2c_bus_controller)); + + /* Calculate i2c frequency */ + step_div = DIV_ROUND_UP(I2C_CLK_HZ, + (400 * KHz * sample_div * 2) * clock_div); + i2c_freq = I2C_CLK_HZ / (step_div * sample_div * 2 * clock_div); + assert(sample_div < 8 && step_div < 64 && i2c_freq <= 400 * KHz && + i2c_freq >= 380 * KHz); + + /* Init i2c bus Timing register */ + write32(&mtk_i2c_bus_controller[bus].i2c_regs->timing, + (sample_div - 1) << 8 | (step_div - 1)); + write32(&mtk_i2c_bus_controller[bus].i2c_regs->ltiming, + (sample_div - 1) << 6 | (step_div - 1)); + + /* Init i2c bus clock_div register */ + write32(&mtk_i2c_bus_controller[bus].i2c_regs->clock_div, + clock_div - 1); +} + +void mtk_i2c_bus_init(uint8_t bus) +{ + mtk_i2c_speed_init(bus); + mtk_i2c_set_gpio_pinmux(bus); +} -- cgit v1.2.3