| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <device/i2c_simple.h> |
| #include <gpio.h> |
| #include <soc/pinmux.h> |
| |
| #include "i2c.h" |
| |
| static struct { |
| int pinmux_func; |
| gpio_t sda; |
| gpio_t scl; |
| } pins[] = { |
| [0]{.pinmux_func = PINMUX_GEN1_I2C_SCL_FUNC_I2C1, |
| .sda = GPIO(C5), .scl = GPIO(C4)}, |
| [1]{.pinmux_func = PINMUX_GEN2_I2C_SCL_FUNC_I2C2, |
| .sda = GPIO(T6), .scl = GPIO(T5)}, |
| [2]{.pinmux_func = PINMUX_CAM_I2C_SCL_FUNC_I2C3, |
| .sda = GPIO(BB2), .scl = GPIO(BB1)}, |
| [3]{.pinmux_func = PINMUX_DDC_SCL_FUNC_I2C4, |
| .sda = GPIO(V5), .scl = GPIO(V4)}, |
| [4]{.pinmux_func = PINMUX_PWR_I2C_SCL_FUNC_I2CPMU, |
| .sda = GPIO(Z7), .scl = GPIO(Z6)}, |
| }; |
| |
| static void tegra_set_sda(unsigned int bus, int high) |
| { |
| if (high) |
| gpio_input_pullup(pins[bus].sda); |
| else |
| gpio_output(pins[bus].sda, 0); |
| } |
| |
| static void tegra_set_scl(unsigned int bus, int high) |
| { |
| if (high) |
| gpio_input_pullup(pins[bus].scl); |
| else |
| gpio_output(pins[bus].scl, 0); |
| } |
| |
| static int tegra_get_sda(unsigned int bus) |
| { |
| return gpio_get(pins[bus].sda); |
| } |
| |
| static int tegra_get_scl(unsigned int bus) |
| { |
| return gpio_get(pins[bus].scl); |
| } |
| |
| static struct software_i2c_ops tegra_ops = { |
| .set_sda = tegra_set_sda, |
| .set_scl = tegra_set_scl, |
| .get_sda = tegra_get_sda, |
| .get_scl = tegra_get_scl, |
| }; |
| |
| void tegra_software_i2c_init(unsigned int bus) |
| { |
| software_i2c[bus] = &tegra_ops; |
| |
| /* Initialize bus to idle state. */ |
| tegra_set_sda(bus, 1); |
| tegra_set_scl(bus, 1); |
| } |
| |
| void tegra_software_i2c_disable(unsigned int bus) |
| { |
| software_i2c[bus] = NULL; |
| |
| /* Return pins to I2C controller. */ |
| pinmux_set_config(pins[bus].sda >> GPIO_PINMUX_SHIFT, |
| pins[bus].pinmux_func | PINMUX_INPUT_ENABLE); |
| pinmux_set_config(pins[bus].scl >> GPIO_PINMUX_SHIFT, |
| pins[bus].pinmux_func | PINMUX_INPUT_ENABLE); |
| gpio_set_mode(pins[bus].sda, GPIO_MODE_SPIO); |
| gpio_set_mode(pins[bus].scl, GPIO_MODE_SPIO); |
| } |