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mmc: Support bypass mode with the get_mmc_clk() method

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Some SoCs want to adjust the input clock to the DWMMC block as a way of
controlling the MMC bus clock. Update the get_mmc_clk() method to support
this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Simon Glass 2015-08-30 16:55:15 -06:00
parent 6a436c9182
commit e3563f2ec7
3 changed files with 17 additions and 3 deletions
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2
drivers/mmc/dw_mmc.c
View file

@ -266,7 +266,7 @@ static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
* host->bus_hz should be set by user.
*/
if (host->get_mmc_clk)
sclk = host->get_mmc_clk(host);
sclk = host->get_mmc_clk(host, freq);
else if (host->bus_hz)
sclk = host->bus_hz;
else {

2
drivers/mmc/exynos_dw_mmc.c
View file

@ -39,7 +39,7 @@ static void exynos_dwmci_clksel(struct dwmci_host *host)
dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
}
unsigned int exynos_dwmci_get_clk(struct dwmci_host *host)
unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
{
unsigned long sclk;
int8_t clk_div;

16
include/dwmmc.h
View file

@ -163,7 +163,21 @@ struct dwmci_host {
void (*clksel)(struct dwmci_host *host);
void (*board_init)(struct dwmci_host *host);
unsigned int (*get_mmc_clk)(struct dwmci_host *host);
/**
* Get / set a particular MMC clock frequency
*
* This is used to request the current clock frequency of the clock
* that drives the DWMMC peripheral. The caller will then use this
* information to work out the divider it needs to achieve the
* required MMC bus clock frequency. If you want to handle the
* clock external to DWMMC, use @freq to select the frequency and
* return that value too. Then DWMMC will put itself in bypass mode.
*
* @host: DWMMC host
* @freq: Frequency the host is trying to achieve
*/
unsigned int (*get_mmc_clk)(struct dwmci_host *host, uint freq);
struct mmc_config cfg;
};