This patch adds I2C support for the Keymile kmeter1 board. It uses the First I2C Controller from the CPU, for accessing 4 temperature sensors, an eeprom with IVM data and the booteeprom over a pca9547 mux.
Signed-off-by: Heiko Schocher hs@denx.de --- changes since v1: - added comments from Kim Philips
board/keymile/common/common.c | 2 +- board/keymile/kmeter1/kmeter1.c | 32 ++++++++++++++++++++++++++++++++ drivers/hwmon/lm75.c | 13 ++++++++++++- include/configs/kmeter1.h | 22 ++++++++++++++++++++++ 4 files changed, 67 insertions(+), 2 deletions(-)
diff --git a/board/keymile/common/common.c b/board/keymile/common/common.c index 1338950..48ce613 100644 --- a/board/keymile/common/common.c +++ b/board/keymile/common/common.c @@ -318,7 +318,7 @@ int ivm_read_eeprom (void) if (buf != NULL) dev_addr = simple_strtoul ((char *)buf, NULL, 16);
- if (eeprom_read (dev_addr, 0, i2c_buffer, CONFIG_SYS_IVM_EEPROM_MAX_LEN) != 0) { + if (i2c_read(dev_addr, 0, 1, i2c_buffer, CONFIG_SYS_IVM_EEPROM_MAX_LEN) != 0) { printf ("Error reading EEprom\n"); return -2; } diff --git a/board/keymile/kmeter1/kmeter1.c b/board/keymile/kmeter1/kmeter1.c index f04a57a..c2df432 100644 --- a/board/keymile/kmeter1/kmeter1.c +++ b/board/keymile/kmeter1/kmeter1.c @@ -59,6 +59,23 @@ const qe_iop_conf_t qe_iop_conf_tab[] = { {0, 0, 0, 0, QE_IOP_TAB_END}, };
+static int board_init_i2c_busses (void) +{ + I2C_MUX_DEVICE *dev = NULL; + uchar *buf; + + /* Set up the Bus for the DTTs */ + buf = (unsigned char *) getenv ("dtt_bus"); + if (buf != NULL) + dev = i2c_mux_ident_muxstring (buf); + if (dev == NULL) { + printf ("Error couldn't add Bus for DTT\n"); + printf ("please setup dtt_bus to where your\n"); + printf ("DTT is found.\n"); + } + return 0; +} + int board_early_init_r (void) { void *reg = (void *)(CONFIG_SYS_IMMR + 0x14a8); @@ -80,6 +97,12 @@ int board_early_init_r (void) return 0; }
+int misc_init_r (void) +{ + board_init_i2c_busses (); + return 0; +} + int fixed_sdram(void) { volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR; @@ -156,3 +179,12 @@ void ft_board_setup (void *blob, bd_t *bd) ft_cpu_setup (blob, bd); } #endif + +#if defined(CONFIG_HUSH_INIT_VAR) +extern int ivm_read_eeprom (void); +int hush_init_var (void) +{ + ivm_read_eeprom (); + return 0; +} +#endif diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index 8119821..2b2a93f 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -42,6 +42,8 @@ #define DTT_TEMP_HYST 0x2 #define DTT_TEMP_SET 0x3
+DECLARE_GLOBAL_DATA_PTR; + int dtt_read(int sensor, int reg) { int dlen; @@ -157,7 +159,16 @@ int dtt_init (void)
/* switch to correct I2C bus */ old_bus = I2C_GET_BUS(); - I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM); + if ((gd->flags & GD_FLG_RELOC) != GD_FLG_RELOC) { + uchar *tmp = (uchar *)getenv("dtt_bus"); + if (tmp == NULL) + printf("FAILED: dtt_bus not defined\n"); + else + if (i2c_mux_ident_muxstring_f(tmp)) + printf("FAILED: couldnt switch to bus\n"); + } else { + I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM); + }
for (i = 0; i < sizeof(sensors); i++) { if (_dtt_init(sensors[i]) != 0) diff --git a/include/configs/kmeter1.h b/include/configs/kmeter1.h index 25b1c17..0980eec 100644 --- a/include/configs/kmeter1.h +++ b/include/configs/kmeter1.h @@ -32,6 +32,7 @@ /* include common defines/options for all Keymile boards */ #include "keymile-common.h"
+#define CONFIG_MISC_INIT_R 1 /* * System Clock Setup */ @@ -300,6 +301,25 @@ #define CONFIG_ENV_SIZE 0x2000 #endif /* CFG_RAMBOOT */
+/* I2C */ +#define CONFIG_HARD_I2C /* I2C with hardware support */ +#undef CONFIG_SOFT_I2C /* I2C bit-banged */ +#define CONFIG_FSL_I2C +#define CONFIG_SYS_I2C_SPEED 200000 /* I2C speed and slave address */ +#define CONFIG_SYS_I2C_SLAVE 0x7F +#define CONFIG_SYS_I2C_OFFSET 0x3000 + +/* I2C SYSMON (LM75, AD7414 is almost compatible) */ +#define CONFIG_DTT_LM75 1 /* ON Semi's LM75 */ +#define CONFIG_DTT_SENSORS {0, 1, 2, 3} /* Sensor addresses */ +#define CONFIG_SYS_DTT_MAX_TEMP 70 +#define CONFIG_SYS_DTT_LOW_TEMP -30 +#define CONFIG_SYS_DTT_HYSTERESIS 3 +#define CONFIG_SYS_DTT_BUS_NUM (2) +#define CONFIG_SYS_DTT_BOARD_INIT 1 + +#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 2 + #if defined(CONFIG_PCI) #define CONFIG_CMD_PCI #endif @@ -452,6 +472,8 @@ "loadfdt=tftp ${fdt_addr_r} ${fdt_file}\0" \ "loadkernel=tftp ${kernel_addr_r} ${boot_file}\0" \ "unlock=yes\0" \ + "EEprom_ivm=pca9547:70:9\0" \ + "dtt_bus=pca9547:70:a\0" \ ""
#endif /* __CONFIG_H */