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Commit 829c1bf4 authored by Marek Vasut's avatar Marek Vasut Committed by Mark Brown
Browse files

mmc: spi: Pull out parts shared between MMC and SPI 



Abstract out the common part of private data shared between MMC
and SPI. These shall later allow to use common clock configuration
function.

Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Acked-by: default avatarChris Ball <cjb@laptop.org>
Acked-by: default avatarShawn Guo <shawn.guo@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent f83b7380

drivers/mmc/host/mxs-mmc.c

+59 −48
Original line number Diff line number Diff line
@@ -62,23 +62,20 @@ 
#define MXS_MMC_DETECT_TIMEOUT			(HZ/2)



struct mxs_mmc_host {

	struct mxs_ssp			ssp;



	struct mmc_host			*mmc;

	struct mmc_request		*mrq;

	struct mmc_command		*cmd;

	struct mmc_data			*data;



	void __iomem			*base;

	int				dma_channel;

	struct clk			*clk;

	unsigned int			clk_rate;



	struct dma_chan         	*dmach;

	struct mxs_dma_data		dma_data;

	unsigned int			dma_dir;

	enum dma_transfer_direction	slave_dirn;

	u32				ssp_pio_words[SSP_PIO_NUM];



	enum mxs_ssp_id			devid;

	unsigned char			bus_width;

	spinlock_t			lock;

	int				sdio_irq_en;
@@ -105,16 +102,18 @@ static int mxs_mmc_get_ro(struct mmc_host *mmc) 
static int mxs_mmc_get_cd(struct mmc_host *mmc)

{

	struct mxs_mmc_host *host = mmc_priv(mmc);

	struct mxs_ssp *ssp = &host->ssp;



	return !(readl(host->base + HW_SSP_STATUS(host)) &

	return !(readl(ssp->base + HW_SSP_STATUS(ssp)) &

		 BM_SSP_STATUS_CARD_DETECT);

}



static void mxs_mmc_reset(struct mxs_mmc_host *host)

{

	struct mxs_ssp *ssp = &host->ssp;

	u32 ctrl0, ctrl1;



	stmp_reset_block(host->base);

	stmp_reset_block(ssp->base);



	ctrl0 = BM_SSP_CTRL0_IGNORE_CRC;

	ctrl1 = BF_SSP(0x3, CTRL1_SSP_MODE) |
@@ -130,15 +129,15 @@ static void mxs_mmc_reset(struct mxs_mmc_host *host) 
	writel(BF_SSP(0xffff, TIMING_TIMEOUT) |

	       BF_SSP(2, TIMING_CLOCK_DIVIDE) |

	       BF_SSP(0, TIMING_CLOCK_RATE),

	       host->base + HW_SSP_TIMING(host));

	       ssp->base + HW_SSP_TIMING(ssp));



	if (host->sdio_irq_en) {

		ctrl0 |= BM_SSP_CTRL0_SDIO_IRQ_CHECK;

		ctrl1 |= BM_SSP_CTRL1_SDIO_IRQ_EN;

	}



	writel(ctrl0, host->base + HW_SSP_CTRL0);

	writel(ctrl1, host->base + HW_SSP_CTRL1(host));

	writel(ctrl0, ssp->base + HW_SSP_CTRL0);

	writel(ctrl1, ssp->base + HW_SSP_CTRL1(ssp));

}



static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
@@ -149,15 +148,16 @@ static void mxs_mmc_request_done(struct mxs_mmc_host *host) 
	struct mmc_command *cmd = host->cmd;

	struct mmc_data *data = host->data;

	struct mmc_request *mrq = host->mrq;

	struct mxs_ssp *ssp = &host->ssp;



	if (mmc_resp_type(cmd) & MMC_RSP_PRESENT) {

		if (mmc_resp_type(cmd) & MMC_RSP_136) {

			cmd->resp[3] = readl(host->base + HW_SSP_SDRESP0(host));

			cmd->resp[2] = readl(host->base + HW_SSP_SDRESP1(host));

			cmd->resp[1] = readl(host->base + HW_SSP_SDRESP2(host));

			cmd->resp[0] = readl(host->base + HW_SSP_SDRESP3(host));

			cmd->resp[3] = readl(ssp->base + HW_SSP_SDRESP0(ssp));

			cmd->resp[2] = readl(ssp->base + HW_SSP_SDRESP1(ssp));

			cmd->resp[1] = readl(ssp->base + HW_SSP_SDRESP2(ssp));

			cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP3(ssp));

		} else {

			cmd->resp[0] = readl(host->base + HW_SSP_SDRESP0(host));

			cmd->resp[0] = readl(ssp->base + HW_SSP_SDRESP0(ssp));

		}

	}
@@ -196,13 +196,14 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id) 
	struct mxs_mmc_host *host = dev_id;

	struct mmc_command *cmd = host->cmd;

	struct mmc_data *data = host->data;

	struct mxs_ssp *ssp = &host->ssp;

	u32 stat;



	spin_lock(&host->lock);



	stat = readl(host->base + HW_SSP_CTRL1(host));

	stat = readl(ssp->base + HW_SSP_CTRL1(ssp));

	writel(stat & MXS_MMC_IRQ_BITS,

	       host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_CLR);

	       ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);



	if ((stat & BM_SSP_CTRL1_SDIO_IRQ) && (stat & BM_SSP_CTRL1_SDIO_IRQ_EN))

		mmc_signal_sdio_irq(host->mmc);
@@ -366,6 +367,8 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host) 
	unsigned int data_size = 0, log2_blksz;

	unsigned int blocks = data->blocks;



	struct mxs_ssp *ssp = &host->ssp;



	u32 ignore_crc, get_resp, long_resp, read;

	u32 ctrl0, cmd0, cmd1, val;
@@ -408,15 +411,15 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host) 
		blocks = 1;



	/* xfer count, block size and count need to be set differently */

	if (ssp_is_old(host)) {

	if (ssp_is_old(ssp)) {

		ctrl0 |= BF_SSP(data_size, CTRL0_XFER_COUNT);

		cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) |

			BF_SSP(blocks - 1, CMD0_BLOCK_COUNT);

	} else {

		writel(data_size, host->base + HW_SSP_XFER_SIZE);

		writel(data_size, ssp->base + HW_SSP_XFER_SIZE);

		writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) |

		       BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT),

		       host->base + HW_SSP_BLOCK_SIZE);

		       ssp->base + HW_SSP_BLOCK_SIZE);

	}



	if ((cmd->opcode == MMC_STOP_TRANSMISSION) ||
@@ -431,11 +434,11 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host) 
	}



	/* set the timeout count */

	timeout = mxs_ns_to_ssp_ticks(host->clk_rate, data->timeout_ns);

	val = readl(host->base + HW_SSP_TIMING(host));

	timeout = mxs_ns_to_ssp_ticks(ssp->clk_rate, data->timeout_ns);

	val = readl(ssp->base + HW_SSP_TIMING(ssp));

	val &= ~(BM_SSP_TIMING_TIMEOUT);

	val |= BF_SSP(timeout, TIMING_TIMEOUT);

	writel(val, host->base + HW_SSP_TIMING(host));

	writel(val, ssp->base + HW_SSP_TIMING(ssp));



	/* pio */

	host->ssp_pio_words[0] = ctrl0;
@@ -500,11 +503,12 @@ static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 


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(host->clk);

	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);
@@ -521,13 +525,13 @@ static void mxs_mmc_set_clk_rate(struct mxs_mmc_host *host, unsigned int rate) 


	ssp_sck = ssp_clk / clock_divide / (1 + clock_rate);



	val = readl(host->base + HW_SSP_TIMING(host));

	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, host->base + HW_SSP_TIMING(host));

	writel(val, ssp->base + HW_SSP_TIMING(ssp));



	host->clk_rate = ssp_sck;

	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",
@@ -552,6 +556,7 @@ static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 
static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)

{

	struct mxs_mmc_host *host = mmc_priv(mmc);

	struct mxs_ssp *ssp = &host->ssp;

	unsigned long flags;



	spin_lock_irqsave(&host->lock, flags);
@@ -560,19 +565,19 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) 


	if (enable) {

		writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,

		       host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);

		       ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_SET);

		writel(BM_SSP_CTRL1_SDIO_IRQ_EN,

		       host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_SET);

		       ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_SET);



		if (readl(host->base + HW_SSP_STATUS(host)) &

		if (readl(ssp->base + HW_SSP_STATUS(ssp)) &

				BM_SSP_STATUS_SDIO_IRQ)

			mmc_signal_sdio_irq(host->mmc);



	} else {

		writel(BM_SSP_CTRL0_SDIO_IRQ_CHECK,

		       host->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);

		       ssp->base + HW_SSP_CTRL0 + STMP_OFFSET_REG_CLR);

		writel(BM_SSP_CTRL1_SDIO_IRQ_EN,

		       host->base + HW_SSP_CTRL1(host) + STMP_OFFSET_REG_CLR);

		       ssp->base + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR);

	}



	spin_unlock_irqrestore(&host->lock, flags);
@@ -635,6 +640,7 @@ static int mxs_mmc_probe(struct platform_device *pdev) 
	dma_cap_mask_t mask;

	struct regulator *reg_vmmc;

	enum of_gpio_flags flags;

	struct mxs_ssp *ssp;



	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
@@ -648,14 +654,16 @@ static int mxs_mmc_probe(struct platform_device *pdev) 
		return -ENOMEM;



	host = mmc_priv(mmc);

	host->base = devm_request_and_ioremap(&pdev->dev, iores);

	if (!host->base) {

	ssp = &host->ssp;

	ssp->dev = &pdev->dev;

	ssp->base = devm_request_and_ioremap(&pdev->dev, iores);

	if (!ssp->base) {

		ret = -EADDRNOTAVAIL;

		goto out_mmc_free;

	}



	if (np) {

		host->devid = (enum mxs_ssp_id) of_id->data;

		ssp->devid = (enum mxs_ssp_id) of_id->data;

		/*

		 * TODO: This is a temporary solution and should be changed

		 * to use generic DMA binding later when the helpers get in.
@@ -668,7 +676,7 @@ static int mxs_mmc_probe(struct platform_device *pdev) 
			goto out_mmc_free;

		}

	} else {

		host->devid = pdev->id_entry->driver_data;

		ssp->devid = pdev->id_entry->driver_data;

		host->dma_channel = dmares->start;

	}
@@ -691,12 +699,12 @@ static int mxs_mmc_probe(struct platform_device *pdev) 
		goto out_mmc_free;

	}



	host->clk = clk_get(&pdev->dev, NULL);

	if (IS_ERR(host->clk)) {

		ret = PTR_ERR(host->clk);

	ssp->clk = clk_get(&pdev->dev, NULL);

	if (IS_ERR(ssp->clk)) {

		ret = PTR_ERR(ssp->clk);

		goto out_mmc_free;

	}

	clk_prepare_enable(host->clk);

	clk_prepare_enable(ssp->clk);



	mxs_mmc_reset(host);
@@ -741,8 +749,8 @@ static int mxs_mmc_probe(struct platform_device *pdev) 


	mmc->max_segs = 52;

	mmc->max_blk_size = 1 << 0xf;

	mmc->max_blk_count = (ssp_is_old(host)) ? 0xff : 0xffffff;

	mmc->max_req_size = (ssp_is_old(host)) ? 0xffff : 0xffffffff;

	mmc->max_blk_count = (ssp_is_old(ssp)) ? 0xff : 0xffffff;

	mmc->max_req_size = (ssp_is_old(ssp)) ? 0xffff : 0xffffffff;

	mmc->max_seg_size = dma_get_max_seg_size(host->dmach->device->dev);



	platform_set_drvdata(pdev, mmc);
@@ -766,8 +774,8 @@ out_free_dma: 
	if (host->dmach)

		dma_release_channel(host->dmach);

out_clk_put:

	clk_disable_unprepare(host->clk);

	clk_put(host->clk);

	clk_disable_unprepare(ssp->clk);

	clk_put(ssp->clk);

out_mmc_free:

	mmc_free_host(mmc);

	return ret;
@@ -777,6 +785,7 @@ static int mxs_mmc_remove(struct platform_device *pdev) 
{

	struct mmc_host *mmc = platform_get_drvdata(pdev);

	struct mxs_mmc_host *host = mmc_priv(mmc);

	struct mxs_ssp *ssp = &host->ssp;



	mmc_remove_host(mmc);
@@ -785,8 +794,8 @@ static int mxs_mmc_remove(struct platform_device *pdev) 
	if (host->dmach)

		dma_release_channel(host->dmach);



	clk_disable_unprepare(host->clk);

	clk_put(host->clk);

	clk_disable_unprepare(ssp->clk);

	clk_put(ssp->clk);



	mmc_free_host(mmc);
@@ -798,11 +807,12 @@ static int mxs_mmc_suspend(struct device *dev) 
{

	struct mmc_host *mmc = dev_get_drvdata(dev);

	struct mxs_mmc_host *host = mmc_priv(mmc);

	struct mxs_ssp *ssp = &host->ssp;

	int ret = 0;



	ret = mmc_suspend_host(mmc);



	clk_disable_unprepare(host->clk);

	clk_disable_unprepare(ssp->clk);



	return ret;

}
@@ -811,9 +821,10 @@ static int mxs_mmc_resume(struct device *dev) 
{

	struct mmc_host *mmc = dev_get_drvdata(dev);

	struct mxs_mmc_host *host = mmc_priv(mmc);

	struct mxs_ssp *ssp = &host->ssp;

	int ret = 0;



	clk_prepare_enable(host->clk);

	clk_prepare_enable(ssp->clk);



	ret = mmc_resume_host(mmc);

include/linux/spi/mxs-spi.h

+8 −0
Original line number Diff line number Diff line
@@ -128,4 +128,12 @@ enum mxs_ssp_id { 
	IMX28_SSP,

};



struct mxs_ssp {

	struct device			*dev;

	void __iomem			*base;

	struct clk			*clk;

	unsigned int			clk_rate;

	enum mxs_ssp_id			devid;

};



#endif	/* __LINUX_SPI_MXS_SPI_H__ */