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ARM: DRA: Enable VTT regulator

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DRA7 evm REV G and later boards uses a vtt regulator for DDR3 termination
and this is controlled by gpio7_11. Configuring gpio7_11.
The pad A22(offset 0x3b4) is used by gpio7_11 on REV G and later boards,
and left unused on previous boards, so it is safe enough to enable gpio
on all DRA7 boards.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
This commit is contained in:
Lokesh Vutla 2014-08-04 19:42:24 +05:30 • committed by Tom Rini
parent 1286b7f6ca
commit 7b92252370
4 changed files with 36 additions and 0 deletions
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3
arch/arm/cpu/armv7/omap-common/hwinit-common.c
View file

@ -140,6 +140,9 @@ void s_init(void)
#endif #endif
prcm_init(); prcm_init();
#ifdef CONFIG_SPL_BUILD #ifdef CONFIG_SPL_BUILD
#ifdef CONFIG_BOARD_EARLY_INIT_F
board_early_init_f();
#endif
/* For regular u-boot sdram_init() is called from dram_init() */ /* For regular u-boot sdram_init() is called from dram_init() */
sdram_init(); sdram_init();
#endif #endif

31
board/ti/dra7xx/evm.c
View file

@ -13,6 +13,8 @@
#include <common.h> #include <common.h>
#include <palmas.h> #include <palmas.h>
#include <sata.h> #include <sata.h>
#include <asm/gpio.h>
#include <asm/arch/gpio.h>
#include <asm/arch/sys_proto.h> #include <asm/arch/sys_proto.h>
#include <asm/arch/mmc_host_def.h> #include <asm/arch/mmc_host_def.h>
#include <asm/arch/sata.h> #include <asm/arch/sata.h>
@ -26,6 +28,9 @@
DECLARE_GLOBAL_DATA_PTR; DECLARE_GLOBAL_DATA_PTR;
/* GPIO 7_11 */
#define GPIO_DDR_VTT_EN 203
const struct omap_sysinfo sysinfo = { const struct omap_sysinfo sysinfo = {
"Board: DRA7xx\n" "Board: DRA7xx\n"
}; };
@ -272,3 +277,29 @@ int board_eth_init(bd_t *bis)
return ret; return ret;
} }
#endif #endif
#ifdef CONFIG_BOARD_EARLY_INIT_F
/* VTT regulator enable */
static inline void vtt_regulator_enable(void)
{
if (omap_hw_init_context() == OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL)
return;
/* Do not enable VTT for DRA722 */
if (omap_revision() == DRA722_ES1_0)
return;
/*
* EVM Rev G and later use gpio7_11 for DDR3 termination.
* This is safe enough to do on older revs.
*/
gpio_request(GPIO_DDR_VTT_EN, "ddr_vtt_en");
gpio_direction_output(GPIO_DDR_VTT_EN, 1);
}
int board_early_init_f(void)
{
vtt_regulator_enable();
return 0;
}
#endif

1
board/ti/dra7xx/mux_data.h
View file

@ -139,5 +139,6 @@ const struct pad_conf_entry core_padconf_array_essential[] = {
{GPMC_CS3, (IEN | PTU | PDIS | M1)}, /* QSPI1_CS1*/ {GPMC_CS3, (IEN | PTU | PDIS | M1)}, /* QSPI1_CS1*/
#endif /* CONFIG_NAND || CONFIG_NOR */ #endif /* CONFIG_NAND || CONFIG_NOR */
{USB2_DRVVBUS, (M0 | IEN | FSC) }, {USB2_DRVVBUS, (M0 | IEN | FSC) },
{SPI1_CS1, (PEN | IDIS | M14) },
}; };
#endif /* _MUX_DATA_DRA7XX_H_ */ #endif /* _MUX_DATA_DRA7XX_H_ */

1
include/configs/dra7xx_evm.h
View file

@ -13,6 +13,7 @@
#define __CONFIG_DRA7XX_EVM_H #define __CONFIG_DRA7XX_EVM_H
#define CONFIG_DRA7XX #define CONFIG_DRA7XX
#define CONFIG_BOARD_EARLY_INIT_F
#ifndef CONFIG_QSPI_BOOT #ifndef CONFIG_QSPI_BOOT
/* MMC ENV related defines */ /* MMC ENV related defines */