From 393c1a34dd852dbf0c409ec94dd48057100480ea Mon Sep 17 00:00:00 2001 From: Philip Rakity Date: Fri, 21 Jan 2011 11:26:40 -0800 Subject: [PATCH] mmc: sdhci: Add pre and post reset processing for chip specific reset Marvell pxa controllers have private registers that may need to be modified before and after a reset is done. For example, the SD reset operation, RESET_ALL, will reset the private registers to their default state. This will cause the clock adjustment registers that may have been programmed to have incorrect values. RESET_DATA sometimes needs to be delayed before the reset is done (depending on SoC) to enable any transactions being handled by the SDIO card to be completed. Needed in pre SD 3.0 silicon to handle clock gating. Implement hooks to allow this to happen. Signed-off-by: Philip Rakity Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci.c | 6 ++++++ drivers/mmc/host/sdhci.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 4b97d5265526..a70a3d1ef35a 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -156,6 +156,9 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask) if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET) ier = sdhci_readl(host, SDHCI_INT_ENABLE); + if (host->ops->platform_reset_enter) + host->ops->platform_reset_enter(host, mask); + sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET); if (mask & SDHCI_RESET_ALL) @@ -176,6 +179,9 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask) mdelay(1); } + if (host->ops->platform_reset_exit) + host->ops->platform_reset_exit(host, mask); + if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET) sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier); } diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 85750a94c612..c6e25a76d269 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -229,6 +229,8 @@ struct sdhci_ops { void (*platform_send_init_74_clocks)(struct sdhci_host *host, u8 power_mode); unsigned int (*get_ro)(struct sdhci_host *host); + void (*platform_reset_enter)(struct sdhci_host *host, u8 mask); + void (*platform_reset_exit)(struct sdhci_host *host, u8 mask); }; #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS