Linux/TMS320DM8148: i2c #1 works in Linux - but not in u-boot ?

Ran,

Did you try to access I2C1 from Kernel? Is that working ?

You might want to reset I2C module using I2C_SYSC and check once (just for testing).

Thanks

Hi,

Yes. It works from Linux, but not from u-boot.

Maybe it is related to configuration in u-boot config file ?
I tried some variations, but nothing helped yet.

# define CONFIG_CMD_I2C
# define CONFIG_HARD_I2C 1
# define CONFIG_SYS_I2C_SPEED 100000
# define CONFIG_SYS_I2C_SLAVE 1
# define CONFIG_SYS_I2C_BUS 0
# define CONFIG_SYS_I2C_BUS_SELECT 1
# define CONFIG_DRIVER_TI81XX_I2C 1
# define CONFIG_I2C_MULTI_BUS 1
//CONFIG_I2C_MUX
//CONFIG_I2C_MULTI_BUS

Regards,
Ran

Ran,

Just a guess, this could be issue with not configuring I2C base address properly for your platform.

Can you please check the PSC base & verify ?

Thanks

Hi,

from DM8148 datasheet:

0x4802_8000 0x4802_8FFF 0x0802_8000 0x0802_8FFF 4KB I2C0 Peripheral Registers

0x4802_9000 0x4802_9FFF 0x0802_9000 0x0802_9FFF 4KB I2C0 Support Registers

0x4802_A000 0x4802_AFFF 0x0802_A000 0x0802_AFFF 4KB I2C1 Peripheral Registers

0x4802_B000 0x4802_BFFF 0x0802_B000 0x0802_BFFF 4KB I2C1 Support Registers

in /asm/arch-ti81xx/ i2c.h

#define I2C_BASE1   0x48028000

#define I2C_BASE2   0x4802A000

#define I2C_BASE3   0x4819C000

#define I2C_BUS_MAX 3

u32 i2c_base = I2C_BASE1;

#define I2C_DEFAULT_BASE    i2c_base

So, it seems to match the datasheet offsets.

I also re-checked pinmux, and can't find any problems in it:

MUX_VAL(PINCNTL78, (IEN | IPU | FCN1 )) /* I2C[1]_SCL */\

MUX_VAL(PINCNTL79, (IEN | IPU | FCN1 )) /* I2C[1]_SDA */\

MUX_VAL(PINCNTL263, (IEN | IPU | FCN1 )) /* I2C[0]_SCL */\

MUX_VAL(PINCNTL264, (IEN | IPU | FCN1 )) /* I2C[0]_SDA */\

I also rechecked configuration file for ti814x:

# define CONFIG_CMD_I2C

# define CONFIG_HARD_I2C            1

# define CONFIG_SYS_I2C_SPEED       100000

# define CONFIG_SYS_I2C_SLAVE       1

# define CONFIG_SYS_I2C_BUS     0

# define CONFIG_SYS_I2C_BUS_SELECT  1

# define CONFIG_DRIVER_TI81XX_I2C   1

# define CONFIG_I2C_MULTI_BUS          1

 

Maybe it's related to eeprom (but eeprom is in bus #0)

#define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 2
#define CONFIG_SYS_I2C_EEPROM_ADDR 0x50
#define CONFIG_SYS_I2C_MULTI_EEPROMS

#define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS 7
#define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS 20

#define CONFIG_CMD_EEPROM

Thank you for any idea.

Ran

 

Hi,

And one more ,

After adding

# define CONFIG_I2C_MULTI_BUS          1

I can do from u-boot prompt:

>i2c dev 0

>i2c dev 2

but on trying

>i2c dev 1

u-boot hangs...

Can anyone try to see if getting the same issue with dm814x ?

Regards,

Ran

Hi Ran,

Which software you are using? EZSDK/IPNC RDK etc? What is the u-boot version?

Thanks

Hi,

I am using RDK.

I have issue with cpu that I can't use i2c 1, but can use i2c 0,2:

These are the relevant modifications in my code for i2c1:

/ti8148/evm.v


__raw_writel(0x2, CM_ALWON_I2C_0_CLKCTRL);
while(__raw_readl(CM_ALWON_I2C_0_CLKCTRL) != 0x2);

+ __raw_writel(0x2, CM_ALWON_I2C_1_CLKCTRL);
+ while(__raw_readl(CM_ALWON_I2C_1_CLKCTRL) != 0x2);
+

/include/configs/ti8148_evm.h


# define CONFIG_SYS_I2C_BUS 0
# define CONFIG_SYS_I2C_BUS_SELECT 1
# define CONFIG_DRIVER_TI81XX_I2C 1
+# define CONFIG_I2C_MULTI_BUS 1
#endif

But then on doing:
#i2c dev 1

It get stuck....

I remember that it once worked. Is it some newer dm814x revision that is responsible for it ?

In Linux it works fine.

Regards,
Ran

Ran Shalit said:

I can do from u-boot prompt:

>i2c dev 0

>i2c dev 2

but on trying

>i2c dev 1

u-boot hangs...

Ran,

We have i2c0 (0x48028000) and i2c2 (0x4819C000) enabled in u-boot by default. Regarding i2c1 (0x4802A000) you should enable it.

Regards,
Pavel

Hi Pavel

I have enabled it as described in above message.

Are there any more changes required for enabling  i2c1

?

Regards

Ran

pinmux, base address

Also "i2c dev" is not available in ti81xx u-boot. Check the options available with i2c -h

Regards,
Pavel