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>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 557886bee9ce..bd91c94ea18e 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/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);