diff options
| author | Philip Rakity <prakity@marvell.com> | 2010-09-23 19:24:32 +0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2010-10-23 17:11:20 +0400 |
| commit | 643a81ff3c5a89ae5c0768f89b29d3e1d08be5c3 (patch) | |
| tree | 594e014da8c4dcfc3d029bd7fe328f7e70e4b038 /drivers/mmc | |
| parent | 3ab9c8dad6444007700b5949ec80cfdc823d31b4 (diff) | |
| download | linux-643a81ff3c5a89ae5c0768f89b29d3e1d08be5c3.tar.xz | |
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 3 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 2 |
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) 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 410ee8aa04d4..bfcd611d7b77 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 |