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mmc: spi: Pull out the SSP clock configuration function

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Pull out the MMC clock configuration function and make it
into SSP clock configuration function, so it can be used by
the SPI driver too.

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Chris Ball <cjb@laptop.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Marek Vasut 2012-08-03 17:26:10 +02:00 committed by Mark Brown
parent 829c1bf40b
commit 1308239858
4 changed files with 66 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/clk/mxs/Makefile
View File

@ -2,7 +2,7 @@
# Makefile for mxs specific clk
#
obj-y += clk.o clk-pll.o clk-ref.o clk-div.o clk-frac.o
obj-y += clk.o clk-pll.o clk-ref.o clk-div.o clk-frac.o clk-ssp.o
obj-$(CONFIG_SOC_IMX23) += clk-imx23.o
obj-$(CONFIG_SOC_IMX28) += clk-imx28.o

62
drivers/clk/mxs/clk-ssp.c Normal file
View File

@ -0,0 +1,62 @@
/*
* Copyright 2012 DENX Software Engineering, GmbH
*
* Pulled from code:
* Portions copyright (C) 2003 Russell King, PXA MMCI Driver
* Portions copyright (C) 2004-2005 Pierre Ossman, W83L51xD SD/MMC driver
*
* Copyright 2008 Embedded Alley Solutions, Inc.
* Copyright 2009-2011 Freescale Semiconductor, Inc.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/spi/mxs-spi.h>
void mxs_ssp_set_clk_rate(struct mxs_ssp *ssp, unsigned int rate)
{
unsigned int ssp_clk, ssp_sck;
u32 clock_divide, clock_rate;
u32 val;
ssp_clk = clk_get_rate(ssp->clk);
for (clock_divide = 2; clock_divide <= 254; clock_divide += 2) {
clock_rate = DIV_ROUND_UP(ssp_clk, rate * clock_divide);
clock_rate = (clock_rate > 0) ? clock_rate - 1 : 0;
if (clock_rate <= 255)
break;
}
if (clock_divide > 254) {
dev_err(ssp->dev,
"%s: cannot set clock to %d\n", __func__, rate);
return;
}
ssp_sck = ssp_clk / clock_divide / (1 + clock_rate);
val = readl(ssp->base + HW_SSP_TIMING(ssp));
val &= ~(BM_SSP_TIMING_CLOCK_DIVIDE | BM_SSP_TIMING_CLOCK_RATE);
val |= BF_SSP(clock_divide, TIMING_CLOCK_DIVIDE);
val |= BF_SSP(clock_rate, TIMING_CLOCK_RATE);
writel(val, ssp->base + HW_SSP_TIMING(ssp));
ssp->clk_rate = ssp_sck;
dev_dbg(ssp->dev,
"%s: clock_divide %d, clock_rate %d, ssp_clk %d, rate_actual %d, rate_requested %d\n",
__func__, clock_divide, clock_rate, ssp_clk, ssp_sck, rate);
}
EXPORT_SYMBOL_GPL(mxs_ssp_set_clk_rate);

39
drivers/mmc/host/mxs-mmc.c
View File

@ -501,43 +501,6 @@ static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
mxs_mmc_start_cmd(host, mrq->cmd);
}
static void mxs_mmc_set_clk_rate(struct mxs_mmc_host *host, unsigned int rate)
{
struct mxs_ssp *ssp = &host->ssp;
unsigned int ssp_clk, ssp_sck;
u32 clock_divide, clock_rate;
u32 val;
ssp_clk = clk_get_rate(ssp->clk);
for (clock_divide = 2; clock_divide <= 254; clock_divide += 2) {
clock_rate = DIV_ROUND_UP(ssp_clk, rate * clock_divide);
clock_rate = (clock_rate > 0) ? clock_rate - 1 : 0;
if (clock_rate <= 255)
break;
}
if (clock_divide > 254) {
dev_err(mmc_dev(host->mmc),
"%s: cannot set clock to %d\n", __func__, rate);
return;
}
ssp_sck = ssp_clk / clock_divide / (1 + clock_rate);
val = readl(ssp->base + HW_SSP_TIMING(ssp));
val &= ~(BM_SSP_TIMING_CLOCK_DIVIDE | BM_SSP_TIMING_CLOCK_RATE);
val |= BF_SSP(clock_divide, TIMING_CLOCK_DIVIDE);
val |= BF_SSP(clock_rate, TIMING_CLOCK_RATE);
writel(val, ssp->base + HW_SSP_TIMING(ssp));
ssp->clk_rate = ssp_sck;
dev_dbg(mmc_dev(host->mmc),
"%s: clock_divide %d, clock_rate %d, ssp_clk %d, rate_actual %d, rate_requested %d\n",
__func__, clock_divide, clock_rate, ssp_clk, ssp_sck, rate);
}
static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mxs_mmc_host *host = mmc_priv(mmc);
@ -550,7 +513,7 @@ static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
host->bus_width = 0;
if (ios->clock)
mxs_mmc_set_clk_rate(host, ios->clock);
mxs_ssp_set_clk_rate(&host->ssp, ios->clock);
}
static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)

2
include/linux/spi/mxs-spi.h
View File

@ -136,4 +136,6 @@ struct mxs_ssp {
enum mxs_ssp_id devid;
};
void mxs_ssp_set_clk_rate(struct mxs_ssp *ssp, unsigned int rate);
#endif /* __LINUX_SPI_MXS_SPI_H__ */