diff options
| -rw-r--r-- | board/synopsys/hsdk/hsdk.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/board/synopsys/hsdk/hsdk.c b/board/synopsys/hsdk/hsdk.c index 7b562556e6..7641978a7b 100644 --- a/board/synopsys/hsdk/hsdk.c +++ b/board/synopsys/hsdk/hsdk.c @@ -26,6 +26,10 @@ int board_early_init_f(void) return 0; } +#define SDIO_BASE (ARC_PERIPHERAL_BASE + 0xA000) +#define SDIO_UHS_REG_EXT (SDIO_BASE + 0x108) +#define SDIO_UHS_REG_EXT_DIV_2 (2 << 30) + int board_mmc_init(bd_t *bis) { struct dwmci_host *host = NULL; @@ -36,12 +40,18 @@ int board_mmc_init(bd_t *bis) return 1; } + /* + * Switch SDIO external ciu clock divider from default div-by-8 to + * minimum possible div-by-2. + */ + writel(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT); + memset(host, 0, sizeof(struct dwmci_host)); host->name = "Synopsys Mobile storage"; host->ioaddr = (void *)ARC_DWMMC_BASE; host->buswidth = 4; host->dev_index = 0; - host->bus_hz = 100000000; + host->bus_hz = 50000000; add_dwmci(host, host->bus_hz / 2, 400000); |