mmc: spi: Pull out common DMA parts from MXS MMC

These parts will be used by the MXS 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>

drivers/mmc/host/mxs-mmc.c

@@ -41,7 +41,6 @@
 #include <linux/gpio.h>
 #include <linux/regulator/consumer.h>
 #include <linux/module.h>
-#include <linux/fsl/mxs-dma.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/stmp_device.h>
 #include <linux/mmc/mxs-mmc.h>
@@ -69,13 +68,6 @@ struct mxs_mmc_host {
 	struct mmc_command		*cmd;
 	struct mmc_data			*data;
 
-	int				dma_channel;
-	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];
-
 	unsigned char			bus_width;
 	spinlock_t			lock;
 	int				sdio_irq_en;
@@ -163,7 +155,7 @@ static void mxs_mmc_request_done(struct mxs_mmc_host *host)
 
 	if (data) {
 		dma_unmap_sg(mmc_dev(host->mmc), data->sg,
-			     data->sg_len, host->dma_dir);
+			     data->sg_len, ssp->dma_dir);
 		/*
 		 * If there was an error on any block, we mark all
 		 * data blocks as being in error.
@@ -232,6 +224,7 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id)
 static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
 	struct mxs_mmc_host *host, unsigned long flags)
 {
+	struct mxs_ssp *ssp = &host->ssp;
 	struct dma_async_tx_descriptor *desc;
 	struct mmc_data *data = host->data;
 	struct scatterlist * sgl;
@@ -240,24 +233,24 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
 	if (data) {
 		/* data */
 		dma_map_sg(mmc_dev(host->mmc), data->sg,
-			   data->sg_len, host->dma_dir);
+			   data->sg_len, ssp->dma_dir);
 		sgl = data->sg;
 		sg_len = data->sg_len;
 	} else {
 		/* pio */
-		sgl = (struct scatterlist *) host->ssp_pio_words;
+		sgl = (struct scatterlist *) ssp->ssp_pio_words;
 		sg_len = SSP_PIO_NUM;
 	}
 
-	desc = dmaengine_prep_slave_sg(host->dmach,
-				sgl, sg_len, host->slave_dirn, flags);
+	desc = dmaengine_prep_slave_sg(ssp->dmach,
+				sgl, sg_len, ssp->slave_dirn, flags);
 	if (desc) {
 		desc->callback = mxs_mmc_dma_irq_callback;
 		desc->callback_param = host;
 	} else {
 		if (data)
 			dma_unmap_sg(mmc_dev(host->mmc), data->sg,
-				     data->sg_len, host->dma_dir);
+				     data->sg_len, ssp->dma_dir);
 	}
 
 	return desc;
@@ -265,6 +258,7 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
 
 static void mxs_mmc_bc(struct mxs_mmc_host *host)
 {
+	struct mxs_ssp *ssp = &host->ssp;
 	struct mmc_command *cmd = host->cmd;
 	struct dma_async_tx_descriptor *desc;
 	u32 ctrl0, cmd0, cmd1;
@@ -278,17 +272,17 @@ static void mxs_mmc_bc(struct mxs_mmc_host *host)
 		cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
 	}
 
-	host->ssp_pio_words[0] = ctrl0;
-	host->ssp_pio_words[1] = cmd0;
-	host->ssp_pio_words[2] = cmd1;
-	host->dma_dir = DMA_NONE;
-	host->slave_dirn = DMA_TRANS_NONE;
+	ssp->ssp_pio_words[0] = ctrl0;
+	ssp->ssp_pio_words[1] = cmd0;
+	ssp->ssp_pio_words[2] = cmd1;
+	ssp->dma_dir = DMA_NONE;
+	ssp->slave_dirn = DMA_TRANS_NONE;
 	desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
 	if (!desc)
 		goto out;
 
 	dmaengine_submit(desc);
-	dma_async_issue_pending(host->dmach);
+	dma_async_issue_pending(ssp->dmach);
 	return;
 
 out:
@@ -298,6 +292,7 @@ out:
 
 static void mxs_mmc_ac(struct mxs_mmc_host *host)
 {
+	struct mxs_ssp *ssp = &host->ssp;
 	struct mmc_command *cmd = host->cmd;
 	struct dma_async_tx_descriptor *desc;
 	u32 ignore_crc, get_resp, long_resp;
@@ -319,17 +314,17 @@ static void mxs_mmc_ac(struct mxs_mmc_host *host)
 		cmd0 |= BM_SSP_CMD0_CONT_CLKING_EN | BM_SSP_CMD0_SLOW_CLKING_EN;
 	}
 
-	host->ssp_pio_words[0] = ctrl0;
-	host->ssp_pio_words[1] = cmd0;
-	host->ssp_pio_words[2] = cmd1;
-	host->dma_dir = DMA_NONE;
-	host->slave_dirn = DMA_TRANS_NONE;
+	ssp->ssp_pio_words[0] = ctrl0;
+	ssp->ssp_pio_words[1] = cmd0;
+	ssp->ssp_pio_words[2] = cmd1;
+	ssp->dma_dir = DMA_NONE;
+	ssp->slave_dirn = DMA_TRANS_NONE;
 	desc = mxs_mmc_prep_dma(host, DMA_CTRL_ACK);
 	if (!desc)
 		goto out;
 
 	dmaengine_submit(desc);
-	dma_async_issue_pending(host->dmach);
+	dma_async_issue_pending(ssp->dmach);
 	return;
 
 out:
@@ -441,11 +436,11 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host)
 	writel(val, ssp->base + HW_SSP_TIMING(ssp));
 
 	/* pio */
-	host->ssp_pio_words[0] = ctrl0;
-	host->ssp_pio_words[1] = cmd0;
-	host->ssp_pio_words[2] = cmd1;
-	host->dma_dir = DMA_NONE;
-	host->slave_dirn = DMA_TRANS_NONE;
+	ssp->ssp_pio_words[0] = ctrl0;
+	ssp->ssp_pio_words[1] = cmd0;
+	ssp->ssp_pio_words[2] = cmd1;
+	ssp->dma_dir = DMA_NONE;
+	ssp->slave_dirn = DMA_TRANS_NONE;
 	desc = mxs_mmc_prep_dma(host, 0);
 	if (!desc)
 		goto out;
@@ -453,14 +448,14 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host)
 	/* append data sg */
 	WARN_ON(host->data != NULL);
 	host->data = data;
-	host->dma_dir = dma_data_dir;
-	host->slave_dirn = slave_dirn;
+	ssp->dma_dir = dma_data_dir;
+	ssp->slave_dirn = slave_dirn;
 	desc = mxs_mmc_prep_dma(host, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 	if (!desc)
 		goto out;
 
 	dmaengine_submit(desc);
-	dma_async_issue_pending(host->dmach);
+	dma_async_issue_pending(ssp->dmach);
 	return;
 out:
 	dev_warn(mmc_dev(host->mmc),
@@ -557,14 +552,15 @@ static const struct mmc_host_ops mxs_mmc_ops = {
 static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param)
 {
 	struct mxs_mmc_host *host = param;
+	struct mxs_ssp *ssp = &host->ssp;
 
 	if (!mxs_dma_is_apbh(chan))
 		return false;
 
-	if (chan->chan_id != host->dma_channel)
+	if (chan->chan_id != ssp->dma_channel)
 		return false;
 
-	chan->private = &host->dma_data;
+	chan->private = &ssp->dma_data;
 
 	return true;
 }
@@ -632,7 +628,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 		 * to use generic DMA binding later when the helpers get in.
 		 */
 		ret = of_property_read_u32(np, "fsl,ssp-dma-channel",
-					   &host->dma_channel);
+					   &ssp->dma_channel);
 		if (ret) {
 			dev_err(mmc_dev(host->mmc),
 				"failed to get dma channel\n");
@@ -640,7 +636,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 		}
 	} else {
 		ssp->devid = pdev->id_entry->driver_data;
-		host->dma_channel = dmares->start;
+		ssp->dma_channel = dmares->start;
 	}
 
 	host->mmc = mmc;
@@ -673,9 +669,9 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
-	host->dma_data.chan_irq = irq_dma;
-	host->dmach = dma_request_channel(mask, mxs_mmc_dma_filter, host);
-	if (!host->dmach) {
+	ssp->dma_data.chan_irq = irq_dma;
+	ssp->dmach = dma_request_channel(mask, mxs_mmc_dma_filter, host);
+	if (!ssp->dmach) {
 		dev_err(mmc_dev(host->mmc),
 			"%s: failed to request dma\n", __func__);
 		goto out_clk_put;
@@ -714,7 +710,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 	mmc->max_blk_size = 1 << 0xf;
 	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);
+	mmc->max_seg_size = dma_get_max_seg_size(ssp->dmach->device->dev);
 
 	platform_set_drvdata(pdev, mmc);
 
@@ -734,8 +730,8 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 	return 0;
 
 out_free_dma:
-	if (host->dmach)
-		dma_release_channel(host->dmach);
+	if (ssp->dmach)
+		dma_release_channel(ssp->dmach);
 out_clk_put:
 	clk_disable_unprepare(ssp->clk);
 	clk_put(ssp->clk);
@@ -754,8 +750,8 @@ static int mxs_mmc_remove(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, NULL);
 
-	if (host->dmach)
-		dma_release_channel(host->dmach);
+	if (ssp->dmach)
+		dma_release_channel(ssp->dmach);
 
 	clk_disable_unprepare(ssp->clk);
 	clk_put(ssp->clk);

drivers/spi/spi-mxs.c

@@ -46,7 +46,6 @@
 #include <linux/gpio.h>
 #include <linux/regulator/consumer.h>
 #include <linux/module.h>
-#include <linux/fsl/mxs-dma.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/stmp_device.h>
 #include <linux/spi/spi.h>

include/linux/spi/mxs-spi.h

@@ -24,6 +24,8 @@
 #ifndef __LINUX_SPI_MXS_SPI_H__
 #define __LINUX_SPI_MXS_SPI_H__
 
+#include <linux/fsl/mxs-dma.h>
+
 #define ssp_is_old(host)	((host)->devid == IMX23_SSP)
 
 /* SSP registers */
@@ -134,6 +136,13 @@ struct mxs_ssp {
 	struct clk			*clk;
 	unsigned int			clk_rate;
 	enum mxs_ssp_id			devid;
+
+	int				dma_channel;
+	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];
 };
 
 void mxs_ssp_set_clk_rate(struct mxs_ssp *ssp, unsigned int rate);