crypto: atmel-tdes - Retire dma_request_slave_channel_compat()

The driver no longer boots in legacy mode, only via DT. This makes the
dma_request_slave_channel_compat() redundant.
If ever the filter function would be executed it will return false as the
dma_slave is not really initialized.

Switch to use dma_request_chan() which would allow legacy boot if ever
needed again by configuring dma_slave_map for the DMA driver.

At the same time skip allocating memory for dma_slave as it is not used
anymore.

Signed-off-by: Peter Ujfalusi <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

Author: Peter Ujfalusi

drivers/crypto/atmel-tdes.c

@@ -739,31 +739,17 @@ static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode)
 	return atmel_tdes_handle_queue(ctx->dd, req);
 }
 
-static bool atmel_tdes_filter(struct dma_chan *chan, void *slave)
-{
-	struct at_dma_slave	*sl = slave;
-
-	if (sl && sl->dma_dev == chan->device->dev) {
-		chan->private = sl;
-		return true;
-	} else {
-		return false;
-	}
-}
-
 static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd,
 			struct crypto_platform_data *pdata)
 {
-	dma_cap_mask_t mask;
-
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_SLAVE, mask);
+	int ret;
 
 	/* Try to grab 2 DMA channels */
-	dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask,
-			atmel_tdes_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
-	if (!dd->dma_lch_in.chan)
+	dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
+	if (IS_ERR(dd->dma_lch_in.chan)) {
+		ret = PTR_ERR(dd->dma_lch_in.chan);
 		goto err_dma_in;
+	}
 
 	dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
 	dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
@@ -776,10 +762,11 @@ static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd,
 		DMA_SLAVE_BUSWIDTH_4_BYTES;
 	dd->dma_lch_in.dma_conf.device_fc = false;
 
-	dd->dma_lch_out.chan = dma_request_slave_channel_compat(mask,
-			atmel_tdes_filter, &pdata->dma_slave->txdata, dd->dev, "rx");
-	if (!dd->dma_lch_out.chan)
+	dd->dma_lch_out.chan = dma_request_chan(dd->dev, "rx");
+	if (IS_ERR(dd->dma_lch_out.chan)) {
+		ret = PTR_ERR(dd->dma_lch_out.chan);
 		goto err_dma_out;
+	}
 
 	dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
 	dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
@@ -797,8 +784,9 @@ static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd,
 err_dma_out:
 	dma_release_channel(dd->dma_lch_in.chan);
 err_dma_in:
-	dev_warn(dd->dev, "no DMA channel available\n");
-	return -ENODEV;
+	if (ret != -EPROBE_DEFER)
+		dev_warn(dd->dev, "no DMA channel available\n");
+	return ret;
 }
 
 static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
@@ -1229,12 +1217,6 @@ static struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *p
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);
 
-	pdata->dma_slave = devm_kzalloc(&pdev->dev,
-					sizeof(*(pdata->dma_slave)),
-					GFP_KERNEL);
-	if (!pdata->dma_slave)
-		return ERR_PTR(-ENOMEM);
-
 	return pdata;
 }
 #else /* CONFIG_OF */
@@ -1328,10 +1310,7 @@ static int atmel_tdes_probe(struct platform_device *pdev)
 				goto err_pdata;
 			}
 		}
-		if (!pdata->dma_slave) {
-			err = -ENXIO;
-			goto err_pdata;
-		}
+
 		err = atmel_tdes_dma_init(tdes_dd, pdata);
 		if (err)
 			goto err_tdes_dma;