struct fsldma_chan *chan = to_fsl_chan(tx->chan);
struct fsl_desc_sw *desc = tx_to_fsl_desc(tx);
struct fsl_desc_sw *child;
- unsigned long flags;
dma_cookie_t cookie = -EINVAL;
- spin_lock_irqsave(&chan->desc_lock, flags);
+ spin_lock_bh(&chan->desc_lock);
+
+#ifdef CONFIG_PM
+ if (unlikely(chan->pm_state != RUNNING)) {
+ chan_dbg(chan, "cannot submit due to suspend\n");
+ spin_unlock_bh(&chan->desc_lock);
+ return -1;
+ }
+#endif
/*
* assign cookies to all of the software descriptors
/* put this transaction onto the tail of the pending queue */
append_ld_queue(chan, desc);
- spin_unlock_irqrestore(&chan->desc_lock, flags);
+ spin_unlock_bh(&chan->desc_lock);
return cookie;
}
return desc;
}
+/**
+ * fsldma_clean_completed_descriptor - free all descriptors which
+ * has been completed and acked
+ * @chan: Freescale DMA channel
+ *
+ * This function is used on all completed and acked descriptors.
+ * All descriptors should only be freed in this function.
+ */
+static void fsldma_clean_completed_descriptor(struct fsldma_chan *chan)
+{
+ struct fsl_desc_sw *desc, *_desc;
+
+ /* Run the callback for each descriptor, in order */
+ list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node)
+ if (async_tx_test_ack(&desc->async_tx))
+ fsl_dma_free_descriptor(chan, desc);
+}
+
+/**
+ * fsldma_run_tx_complete_actions - cleanup a single link descriptor
+ * @chan: Freescale DMA channel
+ * @desc: descriptor to cleanup and free
+ * @cookie: Freescale DMA transaction identifier
+ *
+ * This function is used on a descriptor which has been executed by the DMA
+ * controller. It will run any callbacks, submit any dependencies.
+ */
+static dma_cookie_t fsldma_run_tx_complete_actions(struct fsldma_chan *chan,
+ struct fsl_desc_sw *desc, dma_cookie_t cookie)
+{
+ struct dma_async_tx_descriptor *txd = &desc->async_tx;
+ dma_cookie_t ret = cookie;
+
+ BUG_ON(txd->cookie < 0);
+
+ if (txd->cookie > 0) {
+ ret = txd->cookie;
+
+ /* Run the link descriptor callback function */
+ if (txd->callback) {
+ chan_dbg(chan, "LD %p callback\n", desc);
+ txd->callback(txd->callback_param);
+ }
+ }
+
+ /* Run any dependencies */
+ dma_run_dependencies(txd);
+
+ return ret;
+}
+
+/**
+ * fsldma_clean_running_descriptor - move the completed descriptor from
+ * ld_running to ld_completed
+ * @chan: Freescale DMA channel
+ * @desc: the descriptor which is completed
+ *
+ * Free the descriptor directly if acked by async_tx api, or move it to
+ * queue ld_completed.
+ */
+static void fsldma_clean_running_descriptor(struct fsldma_chan *chan,
+ struct fsl_desc_sw *desc)
+{
+ /* Remove from the list of transactions */
+ list_del(&desc->node);
+
+ /*
+ * the client is allowed to attach dependent operations
+ * until 'ack' is set
+ */
+ if (!async_tx_test_ack(&desc->async_tx)) {
+ /*
+ * Move this descriptor to the list of descriptors which is
+ * completed, but still awaiting the 'ack' bit to be set.
+ */
+ list_add_tail(&desc->node, &chan->ld_completed);
+ return;
+ }
+
+ dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
+}
+
/**
* fsl_chan_xfer_ld_queue - transfer any pending transactions
* @chan : Freescale DMA channel
}
/**
- * fsldma_cleanup_descriptor - cleanup and free a single link descriptor
+ * fsldma_cleanup_descriptors - cleanup link descriptors which are completed
+ * and move them to ld_completed to free until flag 'ack' is set
* @chan: Freescale DMA channel
- * @desc: descriptor to cleanup and free
*
- * This function is used on a descriptor which has been executed by the DMA
- * controller. It will run any callbacks, submit any dependencies, and then
- * free the descriptor.
+ * This function is used on descriptors which have been executed by the DMA
+ * controller. It will run any callbacks, submit any dependencies, then
+ * free these descriptors if flag 'ack' is set.
*/
-static void fsldma_cleanup_descriptor(struct fsldma_chan *chan,
- struct fsl_desc_sw *desc)
+static void fsldma_cleanup_descriptors(struct fsldma_chan *chan)
{
- struct dma_async_tx_descriptor *txd = &desc->async_tx;
+ struct fsl_desc_sw *desc, *_desc;
+ dma_cookie_t cookie = 0;
+ dma_addr_t curr_phys = get_cdar(chan);
+ int seen_current = 0;
+
+ fsldma_clean_completed_descriptor(chan);
+
+ /* Run the callback for each descriptor, in order */
+ list_for_each_entry_safe(desc, _desc, &chan->ld_running, node) {
+ /*
+ * do not advance past the current descriptor loaded into the
+ * hardware channel, subsequent descriptors are either in
+ * process or have not been submitted
+ */
+ if (seen_current)
+ break;
+
+ /*
+ * stop the search if we reach the current descriptor and the
+ * channel is busy
+ */
+ if (desc->async_tx.phys == curr_phys) {
+ seen_current = 1;
+ if (!dma_is_idle(chan))
+ break;
+ }
+
+ cookie = fsldma_run_tx_complete_actions(chan, desc, cookie);
- /* Run the link descriptor callback function */
- if (txd->callback) {
- chan_dbg(chan, "LD %p callback\n", desc);
- txd->callback(txd->callback_param);
+ fsldma_clean_running_descriptor(chan, desc);
}
- /* Run any dependencies */
- dma_run_dependencies(txd);
+ /*
+ * Start any pending transactions automatically
+ *
+ * In the ideal case, we keep the DMA controller busy while we go
+ * ahead and free the descriptors below.
+ */
+ fsl_chan_xfer_ld_queue(chan);
- dma_descriptor_unmap(txd);
- chan_dbg(chan, "LD %p free\n", desc);
- dma_pool_free(chan->desc_pool, desc, txd->phys);
+ if (cookie > 0)
+ chan->common.completed_cookie = cookie;
}
/**
static void fsl_dma_free_chan_resources(struct dma_chan *dchan)
{
struct fsldma_chan *chan = to_fsl_chan(dchan);
- unsigned long flags;
chan_dbg(chan, "free all channel resources\n");
- spin_lock_irqsave(&chan->desc_lock, flags);
+ spin_lock_bh(&chan->desc_lock);
+ fsldma_cleanup_descriptors(chan);
fsldma_free_desc_list(chan, &chan->ld_pending);
fsldma_free_desc_list(chan, &chan->ld_running);
- spin_unlock_irqrestore(&chan->desc_lock, flags);
+ fsldma_free_desc_list(chan, &chan->ld_completed);
+ spin_unlock_bh(&chan->desc_lock);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
{
struct dma_slave_config *config;
struct fsldma_chan *chan;
- unsigned long flags;
int size;
if (!dchan)
switch (cmd) {
case DMA_TERMINATE_ALL:
- spin_lock_irqsave(&chan->desc_lock, flags);
+ spin_lock_bh(&chan->desc_lock);
/* Halt the DMA engine */
dma_halt(chan);
/* Remove and free all of the descriptors in the LD queue */
fsldma_free_desc_list(chan, &chan->ld_pending);
fsldma_free_desc_list(chan, &chan->ld_running);
+ fsldma_free_desc_list(chan, &chan->ld_completed);
chan->idle = true;
- spin_unlock_irqrestore(&chan->desc_lock, flags);
+ spin_unlock_bh(&chan->desc_lock);
return 0;
case DMA_SLAVE_CONFIG:
static void fsl_dma_memcpy_issue_pending(struct dma_chan *dchan)
{
struct fsldma_chan *chan = to_fsl_chan(dchan);
- unsigned long flags;
- spin_lock_irqsave(&chan->desc_lock, flags);
+ spin_lock_bh(&chan->desc_lock);
fsl_chan_xfer_ld_queue(chan);
- spin_unlock_irqrestore(&chan->desc_lock, flags);
+ spin_unlock_bh(&chan->desc_lock);
}
/**
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
+ struct fsldma_chan *chan = to_fsl_chan(dchan);
+ enum dma_status ret;
+
+ ret = dma_cookie_status(dchan, cookie, txstate);
+ if (ret == DMA_COMPLETE)
+ return ret;
+
+ spin_lock_bh(&chan->desc_lock);
+ fsldma_cleanup_descriptors(chan);
+ spin_unlock_bh(&chan->desc_lock);
+
return dma_cookie_status(dchan, cookie, txstate);
}
static void dma_do_tasklet(unsigned long data)
{
struct fsldma_chan *chan = (struct fsldma_chan *)data;
- struct fsl_desc_sw *desc, *_desc;
- LIST_HEAD(ld_cleanup);
- unsigned long flags;
chan_dbg(chan, "tasklet entry\n");
- spin_lock_irqsave(&chan->desc_lock, flags);
-
- /* update the cookie if we have some descriptors to cleanup */
- if (!list_empty(&chan->ld_running)) {
- dma_cookie_t cookie;
-
- desc = to_fsl_desc(chan->ld_running.prev);
- cookie = desc->async_tx.cookie;
- dma_cookie_complete(&desc->async_tx);
-
- chan_dbg(chan, "completed_cookie=%d\n", cookie);
- }
-
- /*
- * move the descriptors to a temporary list so we can drop the lock
- * during the entire cleanup operation
- */
- list_splice_tail_init(&chan->ld_running, &ld_cleanup);
+ spin_lock_bh(&chan->desc_lock);
/* the hardware is now idle and ready for more */
chan->idle = true;
- /*
- * Start any pending transactions automatically
- *
- * In the ideal case, we keep the DMA controller busy while we go
- * ahead and free the descriptors below.
- */
- fsl_chan_xfer_ld_queue(chan);
- spin_unlock_irqrestore(&chan->desc_lock, flags);
-
- /* Run the callback for each descriptor, in order */
- list_for_each_entry_safe(desc, _desc, &ld_cleanup, node) {
-
- /* Remove from the list of transactions */
- list_del(&desc->node);
+ /* Run all cleanup for descriptors which have been completed */
+ fsldma_cleanup_descriptors(chan);
- /* Run all cleanup for this descriptor */
- fsldma_cleanup_descriptor(chan, desc);
- }
+ spin_unlock_bh(&chan->desc_lock);
chan_dbg(chan, "tasklet exit\n");
}
spin_lock_init(&chan->desc_lock);
INIT_LIST_HEAD(&chan->ld_pending);
INIT_LIST_HEAD(&chan->ld_running);
+ INIT_LIST_HEAD(&chan->ld_completed);
chan->idle = true;
+#ifdef CONFIG_PM
+ chan->pm_state = RUNNING;
+#endif
chan->common.device = &fdev->common;
dma_cookie_init(&chan->common);
return 0;
}
+#ifdef CONFIG_PM
+static int fsldma_suspend_late(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct fsldma_device *fdev = platform_get_drvdata(pdev);
+ struct fsldma_chan *chan;
+ int i;
+
+ for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
+ chan = fdev->chan[i];
+ if (!chan)
+ continue;
+
+ spin_lock_bh(&chan->desc_lock);
+ if (unlikely(!chan->idle))
+ goto out;
+ chan->regs_save.mr = get_mr(chan);
+ chan->pm_state = SUSPENDED;
+ spin_unlock_bh(&chan->desc_lock);
+ }
+ return 0;
+
+out:
+ for (; i >= 0; i--) {
+ chan = fdev->chan[i];
+ if (!chan)
+ continue;
+ chan->pm_state = RUNNING;
+ spin_unlock_bh(&chan->desc_lock);
+ }
+ return -EBUSY;
+}
+
+static int fsldma_resume_early(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct fsldma_device *fdev = platform_get_drvdata(pdev);
+ struct fsldma_chan *chan;
+ u32 mode;
+ int i;
+
+ for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
+ chan = fdev->chan[i];
+ if (!chan)
+ continue;
+
+ spin_lock_bh(&chan->desc_lock);
+ mode = chan->regs_save.mr
+ & ~FSL_DMA_MR_CS & ~FSL_DMA_MR_CC & ~FSL_DMA_MR_CA;
+ set_mr(chan, mode);
+ chan->pm_state = RUNNING;
+ spin_unlock_bh(&chan->desc_lock);
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops fsldma_pm_ops = {
+ .suspend_late = fsldma_suspend_late,
+ .resume_early = fsldma_resume_early,
+};
+#endif
+
static const struct of_device_id fsldma_of_ids[] = {
{ .compatible = "fsl,elo3-dma", },
{ .compatible = "fsl,eloplus-dma", },
.name = "fsl-elo-dma",
.owner = THIS_MODULE,
.of_match_table = fsldma_of_ids,
+#ifdef CONFIG_PM
+ .pm = &fsldma_pm_ops,
+#endif
},
.probe = fsldma_of_probe,
.remove = fsldma_of_remove,
projects / cascardo / linux.git / blobdiff