mmc: sh_mmcif: simplify platform data

Provide platforms with a simplified way to specify MMCIF DMA slave IDs in
a way, similar to SDHI and other sh_dma clients.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sh_mmcif.c

@@ -165,6 +165,8 @@ struct sh_mmcif_host {
 	struct mmc_host *mmc;
 	struct mmc_data *data;
 	struct platform_device *pd;
+	struct sh_dmae_slave dma_slave_tx;
+	struct sh_dmae_slave dma_slave_rx;
 	struct clk *hclk;
 	unsigned int clk;
 	int bus_width;
@@ -323,25 +325,35 @@ static bool sh_mmcif_filter(struct dma_chan *chan, void *arg)
 static void sh_mmcif_request_dma(struct sh_mmcif_host *host,
 				 struct sh_mmcif_plat_data *pdata)
 {
+	struct sh_dmae_slave *tx, *rx;
 	host->dma_active = false;
 
 	/* We can only either use DMA for both Tx and Rx or not use it at all */
 	if (pdata->dma) {
+		dev_warn(&host->pd->dev,
+			 "Update your platform to use embedded DMA slave IDs\n");
+		tx = &pdata->dma->chan_priv_tx;
+		rx = &pdata->dma->chan_priv_rx;
+	} else {
+		tx = &host->dma_slave_tx;
+		tx->slave_id = pdata->slave_id_tx;
+		rx = &host->dma_slave_rx;
+		rx->slave_id = pdata->slave_id_rx;
+	}
+	if (tx->slave_id > 0 && rx->slave_id > 0) {
 		dma_cap_mask_t mask;
 
 		dma_cap_zero(mask);
 		dma_cap_set(DMA_SLAVE, mask);
 
-		host->chan_tx = dma_request_channel(mask, sh_mmcif_filter,
-						    &pdata->dma->chan_priv_tx);
+		host->chan_tx = dma_request_channel(mask, sh_mmcif_filter, tx);
 		dev_dbg(&host->pd->dev, "%s: TX: got channel %p\n", __func__,
 			host->chan_tx);
 
 		if (!host->chan_tx)
 			return;
 
-		host->chan_rx = dma_request_channel(mask, sh_mmcif_filter,
-						    &pdata->dma->chan_priv_rx);
+		host->chan_rx = dma_request_channel(mask, sh_mmcif_filter, rx);
 		dev_dbg(&host->pd->dev, "%s: RX: got channel %p\n", __func__,
 			host->chan_rx);
 

include/linux/mmc/sh_mmcif.h

@@ -41,7 +41,9 @@ struct sh_mmcif_plat_data {
 	void (*set_pwr)(struct platform_device *pdev, int state);
 	void (*down_pwr)(struct platform_device *pdev);
 	int (*get_cd)(struct platform_device *pdef);
-	struct sh_mmcif_dma	*dma;
+	struct sh_mmcif_dma	*dma;		/* Deprecated. Instead */
+	unsigned int		slave_id_tx;	/* use embedded slave_id_[tr]x */
+	unsigned int		slave_id_rx;
 	u8			sup_pclk;	/* 1 :SH7757, 0: SH7724/SH7372 */
 	unsigned long		caps;
 	u32			ocr;