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MIPS: Alchemy: au1xmmc: use clk framework

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Use the clock framework to get the peripheral clock rate to
correctly set the MMC/SD bus clock divider.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/7475/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Manuel Lauss 2014-07-23 16:36:56 +02:00 committed by Ralf Baechle
parent ecc2ea3bd8
commit b6507596df
1 changed files with 21 additions and 10 deletions
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31
drivers/mmc/host/au1xmmc.c
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@ -32,6 +32,7 @@
* (the low to high transition will not occur).
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
@ -118,6 +119,7 @@ struct au1xmmc_host {
struct au1xmmc_platform_data *platdata;
struct platform_device *pdev;
struct resource *ioarea;
struct clk *clk;
};
/* Status flags used by the host structure */
@ -597,17 +599,10 @@ static void au1xmmc_cmd_complete(struct au1xmmc_host *host, u32 status)
static void au1xmmc_set_clock(struct au1xmmc_host *host, int rate)
{
unsigned int pbus = get_au1x00_speed();
unsigned int divisor;
unsigned int pbus = clk_get_rate(host->clk);
unsigned int divisor = ((pbus / rate) / 2) - 1;
u32 config;
/* From databook:
* divisor = ((((cpuclock / sbus_divisor) / 2) / mmcclock) / 2) - 1
*/
pbus /= ((alchemy_rdsys(AU1000_SYS_POWERCTRL) & 0x3) + 2);
pbus /= 2;
divisor = ((pbus / rate) / 2) - 1;
config = __raw_readl(HOST_CONFIG(host));
config &= ~(SD_CONFIG_DIV);
@ -1030,6 +1025,16 @@ static int au1xmmc_probe(struct platform_device *pdev)
goto out3;
}
host->clk = clk_get(&pdev->dev, ALCHEMY_PERIPH_CLK);
if (IS_ERR(host->clk)) {
dev_err(&pdev->dev, "cannot find clock\n");
goto out_irq;
}
if (clk_prepare_enable(host->clk)) {
dev_err(&pdev->dev, "cannot enable clock\n");
goto out_clk;
}
host->status = HOST_S_IDLE;
/* board-specific carddetect setup, if any */
@ -1106,7 +1111,10 @@ static int au1xmmc_probe(struct platform_device *pdev)
if (host->platdata && host->platdata->cd_setup &&
!(mmc->caps & MMC_CAP_NEEDS_POLL))
host->platdata->cd_setup(mmc, 0);
out_clk:
clk_disable_unprepare(host->clk);
clk_put(host->clk);
out_irq:
free_irq(host->irq, host);
out3:
iounmap((void *)host->iobase);
@ -1148,6 +1156,9 @@ static int au1xmmc_remove(struct platform_device *pdev)
au1xmmc_set_power(host, 0);
clk_disable_unprepare(host->clk);
clk_put(host->clk);
free_irq(host->irq, host);
iounmap((void *)host->iobase);
release_resource(host->ioarea);