diff options
Diffstat (limited to 'arch/arm/mach-omap/am33xx_generic.c')
| -rw-r--r-- | arch/arm/mach-omap/am33xx_generic.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/arm/mach-omap/am33xx_generic.c b/arch/arm/mach-omap/am33xx_generic.c index 606e3918b3..71c528ca8b 100644 --- a/arch/arm/mach-omap/am33xx_generic.c +++ b/arch/arm/mach-omap/am33xx_generic.c @@ -19,6 +19,7 @@ #include <init.h> #include <io.h> #include <net.h> +#include <asm/barebox-arm.h> #include <mach/am33xx-silicon.h> #include <mach/am33xx-clock.h> #include <mach/generic.h> @@ -318,6 +319,61 @@ void am33xx_config_sdram(const struct am33xx_emif_regs *regs) writel(regs->sdram_config, AM33XX_EMIF4_0_REG(SDRAM_CONFIG)); } +/** + * am335x_sdram_size - read back SDRAM size from sdram_config register + * + * @return: The SDRAM size + */ +unsigned long am335x_sdram_size(void) +{ + int rows, cols, width, banks; + unsigned long size; + uint32_t sdram_config = readl(CM_EMIF_SDRAM_CONFIG); + + rows = ((sdram_config >> 7) & 0x7) + 9; + cols = (sdram_config & 0x7) + 8; + + switch ((sdram_config >> 14) & 0x3) { + case 0: + width = 4; + break; + case 1: + width = 2; + break; + default: + return 0; + } + + switch ((sdram_config >> 4) & 0x7) { + case 0: + banks = 1; + break; + case 1: + banks = 2; + break; + case 2: + banks = 4; + break; + case 3: + banks = 8; + break; + default: + return 0; + } + + size = (1 << rows) * (1 << cols) * banks * width; + + debug("%s: sdram_config: 0x%08x cols: %2d rows: %2d width: %2d banks: %2d size: 0x%08lx\n", + __func__, sdram_config, cols, rows, width, banks, size); + + return size; +} + +void __noreturn am335x_barebox_entry(void *boarddata) +{ + barebox_arm_entry(0x80000000, am335x_sdram_size(), boarddata); +} + void am33xx_config_io_ctrl(int ioctrl) { writel(ioctrl, AM33XX_DDR_CMD0_IOCTRL); |