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| author | Markus Klotzbuecher <mk@creamnet.de> | 2007-01-09 14:57:10 +0100 |
|---|---|---|
| committer | Markus Klotzbuecher <mk@pollux.denx.de> | 2007-01-09 14:57:10 +0100 |
| commit | 3f34f869162750e5e999fd140f884f5de952bcfe (patch) | |
| tree | 64822f58b411c915be6b910b91d1f4f71a1e8641 /include/configs | |
| parent | d28707dbce1e9ac2017ad051da4133bf22b4204f (diff) | |
| download | u-boot-imx-3f34f869162750e5e999fd140f884f5de952bcfe.zip u-boot-imx-3f34f869162750e5e999fd140f884f5de952bcfe.tar.gz u-boot-imx-3f34f869162750e5e999fd140f884f5de952bcfe.tar.bz2 | |
Add / enable I2C support on the spc1920 board
Diffstat (limited to 'include/configs')
| -rw-r--r-- | include/configs/spc1920.h | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/include/configs/spc1920.h b/include/configs/spc1920.h index 6e99699..6db0d1a 100644 --- a/include/configs/spc1920.h +++ b/include/configs/spc1920.h @@ -89,6 +89,7 @@ | CFG_CMD_PING \ | CFG_CMD_DHCP \ | CFG_CMD_IMMAP \ + | CFG_CMD_I2C \ | CFG_CMD_MII) /* & ~( CFG_CMD_NET)) */ @@ -197,9 +198,30 @@ * I2C configuration */ #if (CONFIG_COMMANDS & CFG_CMD_I2C) -#define CONFIG_HARD_I2C 1 /* I2C with hardware support */ -#define CFG_I2C_SPEED 400000 /* I2C speed and slave address defaults */ -#define CFG_I2C_SLAVE 0x7F +/* enable I2C and select the hardware/software driver */ +#undef CONFIG_HARD_I2C /* I2C with hardware support */ +#define CONFIG_SOFT_I2C 1 /* I2C bit-banged */ + +#define CFG_I2C_SPEED 93000 /* 93 kHz is supposed to work */ +#define CFG_I2C_SLAVE 0xFE + +#ifdef CONFIG_SOFT_I2C +/* + * Software (bit-bang) I2C driver configuration + */ +#define PB_SCL 0x00000020 /* PB 26 */ +#define PB_SDA 0x00000010 /* PB 27 */ + +#define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) +#define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) +#define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) +#define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) +#define I2C_SDA(bit) if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ + else immr->im_cpm.cp_pbdat &= ~PB_SDA +#define I2C_SCL(bit) if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ + else immr->im_cpm.cp_pbdat &= ~PB_SCL +#define I2C_DELAY udelay(2) /* 1/4 I2C clock duration */ +#endif /* CONFIG_SOFT_I2C */ #endif /*----------------------------------------------------------------------- |