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authorPhilip Rakity <prakity@marvell.com>2010-09-23 11:24:32 -0400
committerChris Ball <cjb@laptop.org>2010-10-23 09:11:20 -0400
commit643a81ff3c5a89ae5c0768f89b29d3e1d08be5c3 (patch)
tree594e014da8c4dcfc3d029bd7fe328f7e70e4b038
parent3ab9c8dad6444007700b5949ec80cfdc823d31b4 (diff)
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 <prakity@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
-rw-r--r--drivers/mmc/host/sdhci.c3
-rw-r--r--drivers/mmc/host/sdhci.h2
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 23358d339a68..9cb60bac1950 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)
1182 else 1182 else
1183 sdhci_set_power(host, ios->vdd); 1183 sdhci_set_power(host, ios->vdd);
1184 1184
1185 if (host->ops->platform_send_init_74_clocks)
1186 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1187
1185 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); 1188 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1186 1189
1187 if (ios->bus_width == MMC_BUS_WIDTH_8) 1190 if (ios->bus_width == MMC_BUS_WIDTH_8)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 410ee8aa04d4..bfcd611d7b77 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -212,6 +212,8 @@ struct sdhci_ops {
212 unsigned int (*get_max_clock)(struct sdhci_host *host); 212 unsigned int (*get_max_clock)(struct sdhci_host *host);
213 unsigned int (*get_min_clock)(struct sdhci_host *host); 213 unsigned int (*get_min_clock)(struct sdhci_host *host);
214 unsigned int (*get_timeout_clock)(struct sdhci_host *host); 214 unsigned int (*get_timeout_clock)(struct sdhci_host *host);
215 void (*platform_send_init_74_clocks)(struct sdhci_host *host,
216 u8 power_mode);
215}; 217};
216 218
217#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS 219#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS