diff options
Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 7d6bd9d..6ad9ebf 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1474,6 +1474,34 @@ static int dw_mci_get_cd(struct mmc_host *mmc) return present; } +static void dw_mci_hw_reset(struct mmc_host *mmc) +{ + struct dw_mci_slot *slot = mmc_priv(mmc); + struct dw_mci *host = slot->host; + int reset; + + if (host->use_dma == TRANS_MODE_IDMAC) + dw_mci_idmac_reset(host); + + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET | + SDMMC_CTRL_FIFO_RESET)) + return; + + /* + * According to eMMC spec, card reset procedure: + * tRstW >= 1us: RST_n pulse width + * tRSCA >= 200us: RST_n to Command time + * tRSTH >= 1us: RST_n high period + */ + reset = mci_readl(host, RST_N); + reset &= ~(SDMMC_RST_HWACTIVE << slot->id); + mci_writel(host, RST_N, reset); + usleep_range(1, 2); + reset |= SDMMC_RST_HWACTIVE << slot->id; + mci_writel(host, RST_N, reset); + usleep_range(200, 300); +} + static void dw_mci_init_card(struct mmc_host *mmc, struct mmc_card *card) { struct dw_mci_slot *slot = mmc_priv(mmc); @@ -1560,6 +1588,7 @@ static const struct mmc_host_ops dw_mci_ops = { .set_ios = dw_mci_set_ios, .get_ro = dw_mci_get_ro, .get_cd = dw_mci_get_cd, + .hw_reset = dw_mci_hw_reset, .enable_sdio_irq = dw_mci_enable_sdio_irq, .execute_tuning = dw_mci_execute_tuning, .card_busy = dw_mci_card_busy, |
