dma: mv_xor: split initialization/cleanup of XOR channels

Instead of doing the initialization/cleanup of the XOR channels
directly in the ->probe() and ->remove() hooks, we create separate
utility functions mv_xor_channel_add() and mv_xor_channel_remove().

This will allow to easily introduce in a future patch a different way
of registering XOR channels: instead of having one platform_device per
channel, we'll trigger the registration of all XOR channels of a given
XOR engine directly from the XOR engine ->probe() function.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 48 insertions, 27 deletions

diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 704277259a5b..f7b99193e884 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -1077,19 +1077,18 @@ out:
         return err;
 }
 
-static int __devexit mv_xor_remove(struct platform_device *dev)
+static int mv_xor_channel_remove(struct mv_xor_device *device)
 {
-        struct mv_xor_device *device = platform_get_drvdata(dev);
         struct dma_chan *chan, *_chan;
         struct mv_xor_chan *mv_chan;
 
         dma_async_device_unregister(&device->common);
 
-        dma_free_coherent(&dev->dev, device->pool_size,
-                        device->dma_desc_pool_virt, device->dma_desc_pool);
+        dma_free_coherent(&device->pdev->dev, device->pool_size,
+                          device->dma_desc_pool_virt, device->dma_desc_pool);
 
         list_for_each_entry_safe(chan, _chan, &device->common.channels,
-                                device_node) {
+                                 device_node) {
                 mv_chan = to_mv_xor_chan(chan);
                 list_del(&chan->device_node);
         }
@@ -1097,19 +1096,20 @@ static int __devexit mv_xor_remove(struct platform_device *dev)
         return 0;
 }
 
-static int __devinit mv_xor_probe(struct platform_device *pdev)
+static struct mv_xor_device *
+mv_xor_channel_add(struct mv_xor_shared_private *msp,
+                   struct platform_device *pdev,
+                   int hw_id, dma_cap_mask_t cap_mask,
+                   size_t pool_size, int irq)
 {
         int ret = 0;
-        int irq;
         struct mv_xor_device *adev;
         struct mv_xor_chan *mv_chan;
         struct dma_device *dma_dev;
-        struct mv_xor_platform_data *plat_data = pdev->dev.platform_data;
-
 
         adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
         if (!adev)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
 
         dma_dev = &adev->common;
 
@@ -1117,22 +1117,20 @@ static int __devinit mv_xor_probe(struct platform_device *pdev)
          * note: writecombine gives slightly better performance, but
          * requires that we explicitly flush the writes
          */
-        adev->pool_size = plat_data->pool_size;
+        adev->pool_size = pool_size;
         adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev,
                                                           adev->pool_size,
                                                           &adev->dma_desc_pool,
                                                           GFP_KERNEL);
         if (!adev->dma_desc_pool_virt)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
 
-        adev->id = plat_data->hw_id;
+        adev->id = hw_id;
 
         /* discover transaction capabilites from the platform data */
-        dma_dev->cap_mask = plat_data->cap_mask;
+        dma_dev->cap_mask = cap_mask;
         adev->pdev = pdev;
-        platform_set_drvdata(pdev, adev);
-
-        adev->shared = platform_get_drvdata(plat_data->shared);
+        adev->shared = msp;
 
         INIT_LIST_HEAD(&dma_dev->channels);
 
@@ -1159,7 +1157,7 @@ static int __devinit mv_xor_probe(struct platform_device *pdev)
                 goto err_free_dma;
         }
         mv_chan->device = adev;
-        mv_chan->idx = plat_data->hw_id;
+        mv_chan->idx = hw_id;
         mv_chan->mmr_base = adev->shared->xor_base;
 
         if (!mv_chan->mmr_base) {
@@ -1172,11 +1170,6 @@ static int __devinit mv_xor_probe(struct platform_device *pdev)
         /* clear errors before enabling interrupts */
         mv_xor_device_clear_err_status(mv_chan);
 
-        irq = platform_get_irq(pdev, 0);
-        if (irq < 0) {
-                ret = irq;
-                goto err_free_dma;
-        }
         ret = devm_request_irq(&pdev->dev, irq,
                                mv_xor_interrupt_handler,
                                0, dev_name(&pdev->dev), mv_chan);
@@ -1218,13 +1211,41 @@ static int __devinit mv_xor_probe(struct platform_device *pdev)
           dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
 
         dma_async_device_register(dma_dev);
-        goto out;
+        return adev;
 
  err_free_dma:
-        dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
+        dma_free_coherent(&adev->pdev->dev, pool_size,
                         adev->dma_desc_pool_virt, adev->dma_desc_pool);
- out:
-        return ret;
+        return ERR_PTR(ret);
+}
+
+static int __devexit mv_xor_remove(struct platform_device *pdev)
+{
+        struct mv_xor_device *device = platform_get_drvdata(pdev);
+        return mv_xor_channel_remove(device);
+}
+
+static int __devinit mv_xor_probe(struct platform_device *pdev)
+{
+        struct mv_xor_platform_data *plat_data = pdev->dev.platform_data;
+        struct mv_xor_shared_private *msp =
+                platform_get_drvdata(plat_data->shared);
+        struct mv_xor_device *mv_xor_device;
+        int irq;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0)
+                return irq;
+
+        mv_xor_device = mv_xor_channel_add(msp, pdev, plat_data->hw_id,
+                                           plat_data->cap_mask,
+                                           plat_data->pool_size, irq);
+        if (IS_ERR(mv_xor_device))
+                return PTR_ERR(mv_xor_device);
+
+        platform_set_drvdata(pdev, mv_xor_device);
+
+        return 0;
 }
 
 static void