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Merge branch 'topic/rcar' into for-linus

This commit is contained in:
Vinod Koul 2017-07-04 10:05:22 +05:30
parent 2e76eba5e0 33cb0880e0
commit 3edc85023a
3 changed files with 25 additions and 9 deletions
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5
Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt
View File

@ -30,8 +30,9 @@ Required Properties:
- interrupts: interrupt specifiers for the DMAC, one for each entry in
interrupt-names.
- interrupt-names: one entry per channel, named "ch%u", where %u is the
channel number ranging from zero to the number of channels minus one.
- interrupt-names: one entry for the error interrupt, named "error", plus one
entry per channel, named "ch%u", where %u is the channel number ranging from
zero to the number of channels minus one.
- clock-names: "fck" for the functional clock
- clocks: a list of phandle + clock-specifier pairs, one for each entry

2
Documentation/devicetree/bindings/dma/shdma.txt
View File

@ -1,6 +1,6 @@
* SHDMA Device Tree bindings
Sh-/r-mobile and r-car systems often have multiple identical DMA controller
Sh-/r-mobile and R-Car systems often have multiple identical DMA controller
instances, capable of serving any of a common set of DMA slave devices, using
the same configuration. To describe this topology we require all compatible
SHDMA DT nodes to be placed under a DMA multiplexer node. All such compatible

27
drivers/dma/sh/rcar-dmac.c
View File

@ -144,6 +144,7 @@ struct rcar_dmac_chan_map {
* @chan: base DMA channel object
* @iomem: channel I/O memory base
* @index: index of this channel in the controller
* @irq: channel IRQ
* @src: slave memory address and size on the source side
* @dst: slave memory address and size on the destination side
* @mid_rid: hardware MID/RID for the DMA client using this channel
@ -161,6 +162,7 @@ struct rcar_dmac_chan {
struct dma_chan chan;
void __iomem *iomem;
unsigned int index;
int irq;
struct rcar_dmac_chan_slave src;
struct rcar_dmac_chan_slave dst;
@ -1008,7 +1010,11 @@ static void rcar_dmac_free_chan_resources(struct dma_chan *chan)
rcar_dmac_chan_halt(rchan);
spin_unlock_irq(&rchan->lock);
/* Now no new interrupts will occur */
/*
* Now no new interrupts will occur, but one might already be
* running. Wait for it to finish before freeing resources.
*/
synchronize_irq(rchan->irq);
if (rchan->mid_rid >= 0) {
/* The caller is holding dma_list_mutex */
@ -1363,6 +1369,13 @@ static void rcar_dmac_issue_pending(struct dma_chan *chan)
spin_unlock_irqrestore(&rchan->lock, flags);
}
static void rcar_dmac_device_synchronize(struct dma_chan *chan)
{
struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan);
synchronize_irq(rchan->irq);
}
/* -----------------------------------------------------------------------------
* IRQ handling
*/
@ -1647,7 +1660,6 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac,
struct dma_chan *chan = &rchan->chan;
char pdev_irqname[5];
char *irqname;
int irq;
int ret;
rchan->index = index;
@ -1664,8 +1676,8 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac,
/* Request the channel interrupt. */
sprintf(pdev_irqname, "ch%u", index);
irq = platform_get_irq_byname(pdev, pdev_irqname);
if (irq < 0) {
rchan->irq = platform_get_irq_byname(pdev, pdev_irqname);
if (rchan->irq < 0) {
dev_err(dmac->dev, "no IRQ specified for channel %u\n", index);
return -ENODEV;
}
@ -1675,11 +1687,13 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac,
if (!irqname)
return -ENOMEM;
ret = devm_request_threaded_irq(dmac->dev, irq, rcar_dmac_isr_channel,
ret = devm_request_threaded_irq(dmac->dev, rchan->irq,
rcar_dmac_isr_channel,
rcar_dmac_isr_channel_thread, 0,
irqname, rchan);
if (ret) {
dev_err(dmac->dev, "failed to request IRQ %u (%d)\n", irq, ret);
dev_err(dmac->dev, "failed to request IRQ %u (%d)\n",
rchan->irq, ret);
return ret;
}
@ -1843,6 +1857,7 @@ static int rcar_dmac_probe(struct platform_device *pdev)
engine->device_terminate_all = rcar_dmac_chan_terminate_all;
engine->device_tx_status = rcar_dmac_tx_status;
engine->device_issue_pending = rcar_dmac_issue_pending;
engine->device_synchronize = rcar_dmac_device_synchronize;
ret = dma_async_device_register(engine);
if (ret < 0)