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arc: emsdp: Add initialization of PSRAM

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If the "Page Mode" is not enabled on the device,
read operations from PSRAM may result in incorrect data.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Alexey Brodkin 2019-07-18 15:51:25 +03:00
parent d22c8be964
commit 9ddaf1d516
2 changed files with 38 additions and 0 deletions
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37
board/synopsys/emsdp/emsdp.c
View File

@ -48,6 +48,43 @@ int mach_cpu_init(void)
return 0;
}
int board_early_init_r(void)
{
#define EMSDP_PSRAM_BASE 0xf2001000
#define PSRAM_FLASH_CONFIG_REG_0 (void *)(EMSDP_PSRAM_BASE + 0x10)
#define PSRAM_FLASH_CONFIG_REG_1 (void *)(EMSDP_PSRAM_BASE + 0x14)
#define CRE_ENABLE BIT(31)
#define CRE_DRIVE_CMD BIT(6)
#define PSRAM_RCR_DPD BIT(1)
#define PSRAM_RCR_PAGE_MODE BIT(7)
/*
* PSRAM_FLASH_CONFIG_REG_x[30:15] to the address lines[16:1] of flash,
* thus "<< 1".
*/
#define PSRAM_RCR_SETUP ((PSRAM_RCR_DPD | PSRAM_RCR_PAGE_MODE) << 1)
// Switch PSRAM controller to command mode
writel(CRE_ENABLE | CRE_DRIVE_CMD, PSRAM_FLASH_CONFIG_REG_0);
// Program Refresh Configuration Register (RCR) for BANK0
writew(0, (void *)(0x10000000 + PSRAM_RCR_SETUP));
// Switch PSRAM controller back to memory mode
writel(0, PSRAM_FLASH_CONFIG_REG_0);
// Switch PSRAM controller to command mode
writel(CRE_ENABLE | CRE_DRIVE_CMD, PSRAM_FLASH_CONFIG_REG_1);
// Program Refresh Configuration Register (RCR) for BANK1
writew(0, (void *)(0x10800000 + PSRAM_RCR_SETUP));
// Switch PSRAM controller back to memory mode
writel(0, PSRAM_FLASH_CONFIG_REG_1);
printf("PSRAM initialized.\n");
return 0;
}
int board_mmc_init(bd_t *bis)
{
struct dwmci_host *host = NULL;

1
configs/emsdp_defconfig
View File

@ -7,6 +7,7 @@ CONFIG_ENV_SIZE=0x1000
CONFIG_SYS_CLK_FREQ=40000000
# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
CONFIG_VERSION_VARIABLE=y
CONFIG_BOARD_EARLY_INIT_R=y
CONFIG_HUSH_PARSER=y
CONFIG_SYS_PROMPT="emsdp# "
# CONFIG_CMD_BOOTD is not set