staging: Add framebuffer driver for XGI chipsets

[safe/jmp/linux-2.6] / drivers / dma / shdma.c

diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index aab352a..a2a519f 100644 (file)
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -19,6 +19,7 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/dmaengine.h>
 #include <linux/delay.h>
@@ -288,6 +289,7 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
        struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
        struct sh_desc *desc;
        struct sh_dmae_slave *param = chan->private;
+       int ret;
 
        pm_runtime_get_sync(sh_chan->dev);
 
@@ -299,11 +301,15 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
                const struct sh_dmae_slave_config *cfg;
 
                cfg = sh_dmae_find_slave(sh_chan, param);
-               if (!cfg)
-                       return -EINVAL;
+               if (!cfg) {
+                       ret = -EINVAL;
+                       goto efindslave;
+               }
 
-               if (test_and_set_bit(param->slave_id, sh_dmae_slave_used))
-                       return -EBUSY;
+               if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) {
+                       ret = -EBUSY;
+                       goto etestused;
+               }
 
                param->config = cfg;
 
@@ -332,10 +338,20 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
        }
        spin_unlock_bh(&sh_chan->desc_lock);
 
-       if (!sh_chan->descs_allocated)
-               pm_runtime_put(sh_chan->dev);
+       if (!sh_chan->descs_allocated) {
+               ret = -ENOMEM;
+               goto edescalloc;
+       }
 
        return sh_chan->descs_allocated;
+
+edescalloc:
+       if (param)
+               clear_bit(param->slave_id, sh_dmae_slave_used);
+etestused:
+efindslave:
+       pm_runtime_put(sh_chan->dev);
+       return ret;
 }
 
 /*
@@ -581,12 +597,17 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
                               direction, flags);
 }
 
-static void sh_dmae_terminate_all(struct dma_chan *chan)
+static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+                          unsigned long arg)
 {
        struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
 
+       /* Only supports DMA_TERMINATE_ALL */
+       if (cmd != DMA_TERMINATE_ALL)
+               return -ENXIO;
+
        if (!chan)
-               return;
+               return -EINVAL;
 
        dmae_halt(sh_chan);
 
@@ -602,6 +623,8 @@ static void sh_dmae_terminate_all(struct dma_chan *chan)
        spin_unlock_bh(&sh_chan->desc_lock);
 
        sh_dmae_chan_ld_cleanup(sh_chan, true);
+
+       return 0;
 }
 
 static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
@@ -699,6 +722,10 @@ static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
 {
        while (__ld_cleanup(sh_chan, all))
                ;
+
+       if (all)
+               /* Terminating - forgive uncompleted cookies */
+               sh_chan->completed_cookie = sh_chan->common.cookie;
 }
 
 static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
@@ -733,10 +760,9 @@ static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
        sh_chan_xfer_ld_queue(sh_chan);
 }
 
-static enum dma_status sh_dmae_is_complete(struct dma_chan *chan,
+static enum dma_status sh_dmae_tx_status(struct dma_chan *chan,
                                        dma_cookie_t cookie,
-                                       dma_cookie_t *done,
-                                       dma_cookie_t *used)
+                                       struct dma_tx_state *txstate)
 {
        struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
        dma_cookie_t last_used;
@@ -748,12 +774,7 @@ static enum dma_status sh_dmae_is_complete(struct dma_chan *chan,
        last_used = chan->cookie;
        last_complete = sh_chan->completed_cookie;
        BUG_ON(last_complete < 0);
-
-       if (done)
-               *done = last_complete;
-
-       if (used)
-               *used = last_used;
+       dma_set_tx_state(txstate, last_complete, last_used, 0);
 
        spin_lock_bh(&sh_chan->desc_lock);
 
@@ -1025,12 +1046,12 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
                = sh_dmae_alloc_chan_resources;
        shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
        shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
-       shdev->common.device_is_tx_complete = sh_dmae_is_complete;
+       shdev->common.device_tx_status = sh_dmae_tx_status;
        shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
 
        /* Compulsory for DMA_SLAVE fields */
        shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
-       shdev->common.device_terminate_all = sh_dmae_terminate_all;
+       shdev->common.device_control = sh_dmae_control;
 
        shdev->common.dev = &pdev->dev;
        /* Default transfer size of 32 bytes requires 32-byte alignment */
@@ -1171,6 +1192,7 @@ static struct platform_driver sh_dmae_driver = {
        .remove         = __exit_p(sh_dmae_remove),
        .shutdown       = sh_dmae_shutdown,
        .driver = {
+               .owner  = THIS_MODULE,
                .name   = "sh-dma-engine",
        },
 };