From 643a81ff3c5a89ae5c0768f89b29d3e1d08be5c3 Mon Sep 17 00:00:00 2001 From: Philip Rakity Date: Thu, 23 Sep 2010 08:24:32 -0700 Subject: mmc: sdhci: allow for eMMC 74 clock generation by controller Snippet of code for how adaptation layer should handle the call: /* * eMMC spec calls for the host to send 74 clocks to the card * during initialization, right after voltage stabilization. * create the clocks manually right here. */ void generate_init_clocks_A0(struct sdhci_host *host, u8 power_mode) { struct sdhci_mmc_slot *slot = sdhci_priv(host); if (slot->power_mode == MMC_POWER_UP && power_mode == MMC_POWER_ON) { /* controller specific code here */ /* slot->power_mode holds previous power setting */ } slot->power_mode = power_mode; } Signed-off-by: Philip Rakity Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci.c | 3 +++ drivers/mmc/host/sdhci.h | 2 ++ 2 files changed, 5 insertions(+) (limited to 'drivers') diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 23358d339a6..9cb60bac195 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1182,6 +1182,9 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) else sdhci_set_power(host, ios->vdd); + if (host->ops->platform_send_init_74_clocks) + host->ops->platform_send_init_74_clocks(host, ios->power_mode); + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); if (ios->bus_width == MMC_BUS_WIDTH_8) diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 410ee8aa04d..bfcd611d7b7 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -212,6 +212,8 @@ struct sdhci_ops { unsigned int (*get_max_clock)(struct sdhci_host *host); unsigned int (*get_min_clock)(struct sdhci_host *host); unsigned int (*get_timeout_clock)(struct sdhci_host *host); + void (*platform_send_init_74_clocks)(struct sdhci_host *host, + u8 power_mode); }; #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS -- cgit v1.2.3-18-g5258