crypto: omap-des - Use dma_request_chan() for requesting DMA channel

With the new dma_request_chan() the client driver does not need to look for
the DMA resource and it does not need to pass filter_fn anymore.
By switching to the new API the driver can now support deferred probing
against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: David S. Miller <davem@davemloft.net>
CC: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 17 insertions, 51 deletions

diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index b9a465fc2300..3eedb03111ba 100644
--- a/drivers/crypto/omap-des.c
+++ b/drivers/crypto/omap-des.c
@@ -29,7 +29,6 @@
 #include <linux/scatterlist.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
-#include <linux/omap-dma.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -155,9 +154,7 @@ struct omap_des_dev {
 
         struct scatter_walk             in_walk;
         struct scatter_walk             out_walk;
-        int                     dma_in;
         struct dma_chan         *dma_lch_in;
-        int                     dma_out;
         struct dma_chan         *dma_lch_out;
         int                     in_sg_len;
         int                     out_sg_len;
@@ -337,30 +334,21 @@ static void omap_des_dma_out_callback(void *data)
 
 static int omap_des_dma_init(struct omap_des_dev *dd)
 {
-        int err = -ENOMEM;
-        dma_cap_mask_t mask;
+        int err;
 
         dd->dma_lch_out = NULL;
         dd->dma_lch_in = NULL;
 
-        dma_cap_zero(mask);
-        dma_cap_set(DMA_SLAVE, mask);
-
-        dd->dma_lch_in = dma_request_slave_channel_compat(mask,
-                                                          omap_dma_filter_fn,
-                                                          &dd->dma_in,
-                                                          dd->dev, "rx");
-        if (!dd->dma_lch_in) {
+        dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
+        if (IS_ERR(dd->dma_lch_in)) {
                 dev_err(dd->dev, "Unable to request in DMA channel\n");
-                goto err_dma_in;
+                return PTR_ERR(dd->dma_lch_in);
         }
 
-        dd->dma_lch_out = dma_request_slave_channel_compat(mask,
-                                                           omap_dma_filter_fn,
-                                                           &dd->dma_out,
-                                                           dd->dev, "tx");
-        if (!dd->dma_lch_out) {
+        dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
+        if (IS_ERR(dd->dma_lch_out)) {
                 dev_err(dd->dev, "Unable to request out DMA channel\n");
+                err = PTR_ERR(dd->dma_lch_out);
                 goto err_dma_out;
         }
 
@@ -368,14 +356,15 @@ static int omap_des_dma_init(struct omap_des_dev *dd)
 
 err_dma_out:
         dma_release_channel(dd->dma_lch_in);
-err_dma_in:
-        if (err)
-                pr_err("error: %d\n", err);
+
         return err;
 }
 
 static void omap_des_dma_cleanup(struct omap_des_dev *dd)
 {
+        if (dd->pio_only)
+                return;
+
         dma_release_channel(dd->dma_lch_out);
         dma_release_channel(dd->dma_lch_in);
 }
@@ -980,8 +969,6 @@ static int omap_des_get_of(struct omap_des_dev *dd,
                 return -EINVAL;
         }
 
-        dd->dma_out = -1; /* Dummy value that's unused */
-        dd->dma_in = -1; /* Dummy value that's unused */
         dd->pdata = match->data;
 
         return 0;
@@ -997,33 +984,10 @@ static int omap_des_get_of(struct omap_des_dev *dd,
 static int omap_des_get_pdev(struct omap_des_dev *dd,
                 struct platform_device *pdev)
 {
-        struct device *dev = &pdev->dev;
-        struct resource *r;
-        int err = 0;
-
-        /* Get the DMA out channel */
-        r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-        if (!r) {
-                dev_err(dev, "no DMA out resource info\n");
-                err = -ENODEV;
-                goto err;
-        }
-        dd->dma_out = r->start;
-
-        /* Get the DMA in channel */
-        r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-        if (!r) {
-                dev_err(dev, "no DMA in resource info\n");
-                err = -ENODEV;
-                goto err;
-        }
-        dd->dma_in = r->start;
-
         /* non-DT devices get pdata from pdev */
         dd->pdata = pdev->dev.platform_data;
 
-err:
-        return err;
+        return 0;
 }
 
 static int omap_des_probe(struct platform_device *pdev)
@@ -1083,7 +1047,9 @@ static int omap_des_probe(struct platform_device *pdev)
         tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
 
         err = omap_des_dma_init(dd);
-        if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
+        if (err == -EPROBE_DEFER) {
+                goto err_irq;
+        } else if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
                 dd->pio_only = 1;
 
                 irq = platform_get_irq(pdev, 0);
@@ -1141,8 +1107,8 @@ err_algs:
                 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
                         crypto_unregister_alg(
                                         &dd->pdata->algs_info[i].algs_list[j]);
-        if (!dd->pio_only)
-                omap_des_dma_cleanup(dd);
+
+        omap_des_dma_cleanup(dd);
 err_irq:
         tasklet_kill(&dd->done_task);
 err_get: