GPIO control in uboot

marcus lu

Expert 1550 points

Hi Sir :

I work on DM8148 platform and use DVRRDK_03.00.00.00 to develop our system.

I want to control GPIO1_9 in uboot and below is my code.

#define GPIO0_BASE 0x48032000
#define GPIO1_BASE 0x4804C000

#define PINCNTLx_BASE 0x48140800

#define GPIO_CLKCTRL_VAL 0x102

add=CM_ALWON_GPIO_1_CLKCTRL;

regVal = GPIO_CLKCTRL_VAL;
writel(regVal,add);

add=PINCNTLx_BASE+(64-1)*4; ////pinmux64
regVal = (1<<18)|(1 << 16)|0x80; //gpio1(9)
writel(regVal,add);

add=GPIO1_BASE+0x134; ////Output Enable Register:Output Data Enable

regVal = readl(add);

regVal &= 0xfffffdff; ////GP1(9) Output,0 = The corresponding GPIO port is configured as an output.
writel(regVal,add);

add=GPIO1_BASE+0x13c; ////GPIO_DATAOUT Register Field Descriptions
regVal = readl(add);
regVal &= 0xfffffdff; ////GP1(9) Output 0
writel(regVal,add);

I can control GPIO0_28 but I can not control GPIO1_9.

I can not figure out the reason, please kindly give me some suggestion!

Best regard,

Marcus

over 12 years ago

0 Suresha N S over 12 years ago

Expert 1070 points

We faced the same issue for GP1[8] .

We need to write to some extra registers to make this work .

You can use the method described in the below link :

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/153934/557819.aspx

Regards,

Suresha.N.S.

0 marcus lu over 12 years ago in reply to Suresha N S

Expert 1550 points

Hi Suresha:

I appreciate your reply!

It works, I can control gp1 now.

Thanks very much!

Best regards,

Marcus

0 Abhishek Kumar47 over 10 years ago in reply to Suresha N S

Intellectual 945 points

Hi Suresha,

I want to toggle the 7th pin of port 1 in the U-BOOT for dm8148 and i am toggling it by doing pull up and pull down at the time of muxing does it a right way

my code is below

but my code is hang at printf("enabling the 7th pin of port 1 as output\n");

static void gpio_pad_config_mux(void)
{
unsigned int i;
__raw_writel(MLBP_SIG_IO_CTRL_VAL, MLBP_SIG_IO_CTRL_FOR_GPb7b8);
__raw_writel(MLBP_SIG_IO_CTRL_VAL, MLBP_SIG_IO_CTRL_FOR_GPb9b10);

printf("enabling the 7th pin of port 1 as output\n");
while(1)
{
__raw_writel(0x000E0080, 0x481408F4);//GP1[7]
for(i=0; i<0xffff; i++)
{}
__raw_writel(0x000f0080, 0x481408f4);

for(i=0; i<0xffff; i++)
{}
}
}

BR

Abhishek

Processors

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GPIO control in uboot