diff options
| -rw-r--r-- | arch/arm/include/asm/arch-tegra/i2c.h | 24 | ||||
| -rw-r--r-- | drivers/i2c/tegra_i2c.c | 30 |
2 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-tegra/i2c.h b/arch/arm/include/asm/arch-tegra/i2c.h index 25fb21d3fc8..458cd5ef60b 100644 --- a/arch/arm/include/asm/arch-tegra/i2c.h +++ b/arch/arm/include/asm/arch-tegra/i2c.h @@ -168,4 +168,28 @@ struct i2c_ctlr { #define I2C_INT_NO_ACK_RANGE 3 : 3 #define I2C_INT_ARBITRATION_LOST_RANGE 2 : 2 +/** + * Low level, hopefully temporary, functions to write values to the + * Tegra DVC I2C controller. These are used by T30 init, when running + * on the AVP CPU, before the Cortex-A9s are up. It is not easy to + * have the i2c infrastructure up that early, but we still want to put + * this code in the driver + */ + +/** + * Write an address (with config) to the DVC I2C + * + * @param addr Address to write + * @param config Config to write + */ +void tegra_i2c_ll_write_addr(uint addr, uint config); + +/** + * Write a data word (with config) to the DVC I2C + * + * @param data Data to write + * @param config Config to write + */ +void tegra_i2c_ll_write_data(uint data, uint config); + #endif diff --git a/drivers/i2c/tegra_i2c.c b/drivers/i2c/tegra_i2c.c index c51dd906927..3a94116831b 100644 --- a/drivers/i2c/tegra_i2c.c +++ b/drivers/i2c/tegra_i2c.c @@ -32,6 +32,9 @@ #include <asm/arch/pinmux.h> #include <fdt_decode.h> +/* TODO(sjg): This driver has not been tested with Tegra3 yet */ +#ifdef CONFIG_TEGRA2 + DECLARE_GLOBAL_DATA_PTR; static unsigned int i2c_bus_num; @@ -623,3 +626,30 @@ int i2c_set_bus_num(unsigned int bus) return 0; } #endif + +#else /* not CONFIG_TEGRA2 */ + +/* Not implemented for now */ +int i2c_init_board(void) +{ + printf("i2c support is not available on T30\n"); + return -1; +} + +#endif /* CONFIG_TEGRA2 */ + +void tegra_i2c_ll_write_addr(uint addr, uint config) +{ + struct i2c_ctlr *reg = (struct i2c_ctlr *)TEGRA_DVC_BASE; + + writel(addr, ®->cmd_addr0); + writel(config, ®->cnfg); +} + +void tegra_i2c_ll_write_data(uint data, uint config) +{ + struct i2c_ctlr *reg = (struct i2c_ctlr *)TEGRA_DVC_BASE; + + writel(data, ®->cmd_data1); + writel(config, ®->cnfg); +} |