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 <ma...@denx.de> Cc: Chris Ball <c...@laptop.org> Cc: Detlev Zundel <d...@denx.de> CC: Dong Aisheng <b29...@freescale.com> Cc: Fabio Estevam <fabio.este...@freescale.com> Cc: Grant Likely <grant.lik...@secretlab.ca> Cc: Linux ARM kernel <linux-arm-ker...@lists.infradead.org> Cc: Rob Herring <rob.herr...@calxeda.com> CC: Shawn Guo <shawn....@linaro.org> Cc: Stefano Babic <sba...@denx.de> Cc: Wolfgang Denk <w...@denx.de> --- drivers/clk/mxs/Makefile | 2 +- drivers/clk/mxs/clk-ssp.c | 61 +++++++++++++++++++++++++++++++++++++++++++ drivers/mmc/host/mxs-mmc.c | 39 +-------------------------- include/linux/spi/mxs-spi.h | 2 ++ 4 files changed, 65 insertions(+), 39 deletions(-) create mode 100644 drivers/clk/mxs/clk-ssp.c diff --git a/drivers/clk/mxs/Makefile b/drivers/clk/mxs/Makefile index 7bedeec..a6a2223 100644 --- a/drivers/clk/mxs/Makefile +++ b/drivers/clk/mxs/Makefile @@ -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 diff --git a/drivers/clk/mxs/clk-ssp.c b/drivers/clk/mxs/clk-ssp.c new file mode 100644 index 0000000..b3c1e16 --- /dev/null +++ b/drivers/clk/mxs/clk-ssp.c @@ -0,0 +1,61 @@ +/* + * 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); +} diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c index 1ea1cba..3b1c99b 100644 --- a/drivers/mmc/host/mxs-mmc.c +++ b/drivers/mmc/host/mxs-mmc.c @@ -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) diff --git a/include/linux/spi/mxs-spi.h b/include/linux/spi/mxs-spi.h index 0cb2767..2bc8abb 100644 --- a/include/linux/spi/mxs-spi.h +++ b/include/linux/spi/mxs-spi.h @@ -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__ */ -- 1.7.10.4 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
