diff options
Diffstat (limited to 'src/soc/nvidia/tegra')
| -rw-r--r-- | src/soc/nvidia/tegra/i2c.c | 2 | ||||
| -rw-r--r-- | src/soc/nvidia/tegra/i2c.h | 2 | ||||
| -rw-r--r-- | src/soc/nvidia/tegra/software_i2c.c | 96 |
3 files changed, 99 insertions, 1 deletions
diff --git a/src/soc/nvidia/tegra/i2c.c b/src/soc/nvidia/tegra/i2c.c index 6c269cfaed..555d0318c1 100644 --- a/src/soc/nvidia/tegra/i2c.c +++ b/src/soc/nvidia/tegra/i2c.c @@ -180,7 +180,7 @@ static int i2c_transfer_segment(unsigned bus, unsigned chip, int restart, return 0; } -int i2c_transfer(unsigned bus, struct i2c_seg *segments, int count) +int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int count) { struct i2c_seg *seg = segments; diff --git a/src/soc/nvidia/tegra/i2c.h b/src/soc/nvidia/tegra/i2c.h index 6347fff8ad..4b1bddd2af 100644 --- a/src/soc/nvidia/tegra/i2c.h +++ b/src/soc/nvidia/tegra/i2c.h @@ -23,6 +23,8 @@ #include <stdint.h> void i2c_init(unsigned bus); +void tegra_software_i2c_init(unsigned bus); +void tegra_software_i2c_disable(unsigned bus); enum { /* Word 0 */ diff --git a/src/soc/nvidia/tegra/software_i2c.c b/src/soc/nvidia/tegra/software_i2c.c new file mode 100644 index 0000000000..b50fb4f654 --- /dev/null +++ b/src/soc/nvidia/tegra/software_i2c.c @@ -0,0 +1,96 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Google, 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 <device/i2c.h> +#include <soc/nvidia/tegra124/gpio.h> +#include <soc/nvidia/tegra124/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 bus, int high) +{ + if (high) + gpio_input_pullup(pins[bus].sda); + else + gpio_output(pins[bus].sda, 0); +} + +static void tegra_set_scl(unsigned bus, int high) +{ + if (high) + gpio_input_pullup(pins[bus].scl); + else + gpio_output(pins[bus].scl, 0); +} + +static int tegra_get_sda(unsigned bus) +{ + return gpio_get_in_value(pins[bus].sda); +} + +static int tegra_get_scl(unsigned bus) +{ + return gpio_get_in_value(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 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 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); +} |