[U-Boot] [PATCH 1/1] mmc: omap: config VMMC, MMC1_PBIAS

[Marek Vasut]

On Thursday, August 25, 2011 04:48:25 PM Balaji T K wrote:
> Config VMMC voltage to 3V for MMC/SD card slot
> and PBIAS settings needed for OMAP4
> Fixes MMC/SD detection on boot from eMMC.
> 
> Signed-off-by: Balaji T K <balajitk at ti.com>
> Signed-off-by: Aneesh V <aneesh at ti.com>
> ---
>  arch/arm/include/asm/arch-omap4/omap4.h |    1 +
>  drivers/mmc/omap_hsmmc.c                |   28
> +++++++++++++++++++++++++--- drivers/power/twl6030.c                 |   
> 7 +++++++
>  include/configs/omap4_sdp4430.h         |    2 ++
>  include/twl6030.h                       |    3 +++
>  5 files changed, 38 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/include/asm/arch-omap4/omap4.h
> b/arch/arm/include/asm/arch-omap4/omap4.h index 9aad0e6..13fc8c9 100644
> --- a/arch/arm/include/asm/arch-omap4/omap4.h
> +++ b/arch/arm/include/asm/arch-omap4/omap4.h
> @@ -55,6 +55,7 @@
>  #define LPDDR2_IO_REGS_BASE	0x4A100638
> 
>  #define CONTROL_EFUSE_2		0x4A100704
> +#define CONTROL_PBIASLITE	0x4A100600

Can't you use struct omap_something_regs { ... } like most of U-Boot code ?

> 
>  /* CONTROL_ID_CODE */
>  #define CONTROL_ID_CODE		0x4A002204
> diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
> index 6627905..95bb661 100644
> --- a/drivers/mmc/omap_hsmmc.c
> +++ b/drivers/mmc/omap_hsmmc.c
> @@ -28,6 +28,7 @@
>  #include <part.h>
>  #include <i2c.h>
>  #include <twl4030.h>
> +#include <twl6030.h>
>  #include <asm/io.h>
>  #include <asm/arch/mmc_host_def.h>
>  #include <asm/arch/sys_proto.h>
> @@ -38,7 +39,24 @@
>  static int mmc_read_data(hsmmc_t *mmc_base, char *buf, unsigned int size);
>  static int mmc_write_data(hsmmc_t *mmc_base, const char *buf, unsigned int
> siz); static struct mmc hsmmc_dev[2];
> -unsigned char mmc_board_init(hsmmc_t *mmc_base)
> +
> +#if defined(CONFIG_OMAP44XX) && defined(CONFIG_TWL6030_POWER)
> +static void omap4_vmmc_pbias_config(struct mmc *mmc)
> +{
> +	u32 value = 0;
> +
> +	value = readl(CONTROL_PBIASLITE);
> +	value &= ~((1 << 22) | (1 << 26));

What's this magic ?

> +	writel(value, CONTROL_PBIASLITE);
> +	/* set VMMC to 3V */
> +	twl6030_power_mmc_init();
> +	value = readl(CONTROL_PBIASLITE);
> +	value |= (1 << 21) | (1 << 22) | (1 << 26);

And this magic ?

> +	writel(value, CONTROL_PBIASLITE);
> +}
> +#endif
> +
> +unsigned char mmc_board_init(struct mmc *mmc)
>  {
>  #if defined(CONFIG_TWL4030_POWER)
>  	twl4030_power_mmc_init();
> @@ -67,7 +85,11 @@ unsigned char mmc_board_init(hsmmc_t *mmc_base)
>  		&prcm_base->iclken1_core);
>  #endif
> 
> -/* TODO add appropriate OMAP4 init - none currently necessary */
> +#if defined(CONFIG_OMAP44XX) && defined(CONFIG_TWL6030_POWER)
> +	/* PBIAS config needed for MMC1 only */

You have == 0 below ... so you're numbering from 1 here ? It's a bit confusing.

> +	if (mmc->block_dev.dev == 0)
> +		omap4_vmmc_pbias_config(mmc);
> +#endif
> 
>  	return 0;
>  }
> @@ -108,7 +130,7 @@ static int mmc_init_setup(struct mmc *mmc)
>  	unsigned int dsor;
>  	ulong start;
> 
> -	mmc_board_init(mmc_base);
> +	mmc_board_init(mmc);

Is this a bugfix ?

> 
>  	writel(readl(&mmc_base->sysconfig) | MMC_SOFTRESET,
>  		&mmc_base->sysconfig);
> diff --git a/drivers/power/twl6030.c b/drivers/power/twl6030.c
> index fef57b4..c5a0038 100644
> --- a/drivers/power/twl6030.c
> +++ b/drivers/power/twl6030.c
> @@ -182,6 +182,13 @@ void twl6030_init_battery_charging(void)
>  	return;
>  }
> 
> +void twl6030_power_mmc_init()
> +{
> +	/* set voltage to 3.0 and turnon for APP */
> +	twl6030_i2c_write_u8(TWL6030_CHIP_PM, 0x15, VMMC_CFG_VOLTATE);
> +	twl6030_i2c_write_u8(TWL6030_CHIP_PM, 0x21, VMMC_CFG_STATE);
> +}
> +
>  void twl6030_usb_device_settings()
>  {
>  	u8 data = 0;
> diff --git a/include/configs/omap4_sdp4430.h
> b/include/configs/omap4_sdp4430.h index 5b3110c..50797ab 100644
> --- a/include/configs/omap4_sdp4430.h
> +++ b/include/configs/omap4_sdp4430.h
> @@ -98,8 +98,10 @@
>  #define CONFIG_I2C_MULTI_BUS		1
> 
>  /* TWL6030 */
> +#ifndef CONFIG_SPL_BUILD
>  #define CONFIG_TWL6030_POWER		1
>  #define CONFIG_CMD_BAT			1
> +#endif
> 
>  /* MMC */
>  #define CONFIG_GENERIC_MMC		1
> diff --git a/include/twl6030.h b/include/twl6030.h
> index 6ed68a0..a9fcadb 100644
> --- a/include/twl6030.h
> +++ b/include/twl6030.h
> @@ -33,6 +33,8 @@
>  #define TWL6030_CHIP_PWM	0x49
> 
>  /* Slave Address 0x48 */
> +#define VMMC_CFG_STATE		0x9A
> +#define VMMC_CFG_VOLTATE	0x9B
>  #define VUSB_CFG_STATE		0xA2
> 
>  #define MISC1			0xE4
> @@ -130,3 +132,4 @@ void twl6030_start_usb_charging(void);
>  void twl6030_stop_usb_charging(void);
>  int twl6030_get_battery_voltage(void);
>  int twl6030_get_battery_current(void);
> +void twl6030_power_mmc_init(void);

Thanks! Cheers!