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board/freescale/common: Check IR chip mode for VID support

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IR chip on all the boards are required to be used in Intel mode
to support VID. VDD will not be adjusted if IR chip is used in
other modes.

Signed-off-by: Ying Zhang <b40530@freescale.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Ying Zhang 2016-01-22 12:15:12 +08:00 committed by York Sun
parent 43381474ff
commit cabe4d2f19
2 changed files with 20 additions and 1 deletions
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17
board/freescale/common/vid.c
View file

@ -292,7 +292,7 @@ int adjust_vdd(ulong vdd_override)
(void __iomem *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
#endif
u32 fusesr;
u8 vid;
u8 vid, buf;
int vdd_target, vdd_current, vdd_last;
int ret, i2caddress;
unsigned long vdd_string_override;
@ -346,6 +346,21 @@ int adjust_vdd(ulong vdd_override)
debug("VID: IR Chip found on I2C address 0x%02x\n", i2caddress);
}
/* check IR chip work on Intel mode*/
ret = i2c_read(i2caddress,
IR36021_INTEL_MODE_OOFSET,
1, (void *)&buf, 1);
if (ret) {
printf("VID: failed to read IR chip mode.\n");
ret = -1;
goto exit;
}
if ((buf & IR36021_MODE_MASK) != IR36021_INTEL_MODE) {
printf("VID: IR Chip is not used in Intel mode.\n");
ret = -1;
goto exit;
}
/* get the voltage ID from fuse status register */
fusesr = in_be32(&gur->dcfg_fusesr);
/*

4
board/freescale/common/vid.h
View file

@ -11,6 +11,10 @@
#define IR36021_LOOP1_VOUT_OFFSET 0x9A
#define IR36021_MFR_ID_OFFSET 0x92
#define IR36021_MFR_ID 0x43
#define IR36021_INTEL_MODE_OOFSET 0x14
#define IR36021_MODE_MASK 0x20
#define IR36021_INTEL_MODE 0x00
#define IR36021_AMD_MODE 0x20
/* step the IR regulator in 5mV increments */
#define IR_VDD_STEP_DOWN 5