| Message ID | 20240524182702.1317935-6-dave.stevenson@raspberrypi.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | BCM2835 DMA mapping cleanups and fixes | expand |
On Fri, May 24, 2024 at 07:26:49PM +0100, Dave Stevenson wrote: > From: Stefan Wahren <stefan.wahren@i2se.com> > > Similar to the info generation, generate the final extra info with a > separate function. This is necessary to introduce other platforms > with different info bits. Each patch commit is independent. Introduce common help function to generate the final extra info to reduce duplicate codes in each DMA operation. > > Signed-off-by: Stefan Wahren <wahrenst@gmx.net> > Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> > --- > drivers/dma/bcm2835-dma.c | 34 ++++++++++++++++++++++++++++------ > 1 file changed, 28 insertions(+), 6 deletions(-) > > diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c > index 7cef7ff89575..ef452ebb3c15 100644 > --- a/drivers/dma/bcm2835-dma.c > +++ b/drivers/dma/bcm2835-dma.c > @@ -229,6 +229,29 @@ static u32 bcm2835_dma_prepare_cb_info(struct bcm2835_chan *c, > return result; > } > > +static u32 bcm2835_dma_prepare_cb_extra(struct bcm2835_chan *c, > + enum dma_transfer_direction direction, > + bool cyclic, bool final, > + unsigned long flags) > +{ > + u32 result = 0; > + > + if (cyclic) { > + if (flags & DMA_PREP_INTERRUPT) > + result |= BCM2835_DMA_INT_EN; > + } else { > + if (!final) > + return 0; > + > + result |= BCM2835_DMA_INT_EN; > + > + if (direction == DMA_MEM_TO_MEM) > + result |= BCM2835_DMA_WAIT_RESP; > + } move if (direction == DMA_MEM_TO_MEM) outof else branch. DMA_MEM_TO_MEM is impossible for cyclic. Reduce if level can help easy to follow up. if (cyclic) ... else ... if (direction == DMA_MEM_TO_MEM) result |= BCM2835_DMA_WAIT_RESP; > + > + return result; > +} > + > static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc) > { > size_t i; > @@ -644,7 +667,8 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy( > struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); > struct bcm2835_desc *d; > u32 info = bcm2835_dma_prepare_cb_info(c, DMA_MEM_TO_MEM, false); > - u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP; > + u32 extra = bcm2835_dma_prepare_cb_extra(c, DMA_MEM_TO_MEM, false, > + true, 0); > size_t max_len = bcm2835_dma_max_frame_length(c); > size_t frames; > > @@ -675,7 +699,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg( > struct bcm2835_desc *d; > dma_addr_t src = 0, dst = 0; > u32 info = bcm2835_dma_prepare_cb_info(c, direction, false); > - u32 extra = BCM2835_DMA_INT_EN; > + u32 extra = bcm2835_dma_prepare_cb_extra(c, direction, false, true, 0); > size_t frames; > > if (!is_slave_direction(direction)) { > @@ -723,7 +747,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( > dma_addr_t src, dst; > u32 info = bcm2835_dma_prepare_cb_info(c, direction, > buf_addr == od->zero_page); > - u32 extra = 0; > + u32 extra = bcm2835_dma_prepare_cb_extra(c, direction, true, true, 0); > size_t max_len = bcm2835_dma_max_frame_length(c); > size_t frames; > > @@ -739,9 +763,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( > return NULL; > } > > - if (flags & DMA_PREP_INTERRUPT) > - extra |= BCM2835_DMA_INT_EN; > - else > + if (!(flags & DMA_PREP_INTERRUPT)) > period_len = buf_len; > > /* > -- > 2.34.1 >
diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 7cef7ff89575..ef452ebb3c15 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -229,6 +229,29 @@ static u32 bcm2835_dma_prepare_cb_info(struct bcm2835_chan *c, return result; } +static u32 bcm2835_dma_prepare_cb_extra(struct bcm2835_chan *c, + enum dma_transfer_direction direction, + bool cyclic, bool final, + unsigned long flags) +{ + u32 result = 0; + + if (cyclic) { + if (flags & DMA_PREP_INTERRUPT) + result |= BCM2835_DMA_INT_EN; + } else { + if (!final) + return 0; + + result |= BCM2835_DMA_INT_EN; + + if (direction == DMA_MEM_TO_MEM) + result |= BCM2835_DMA_WAIT_RESP; + } + + return result; +} + static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc) { size_t i; @@ -644,7 +667,8 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy( struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); struct bcm2835_desc *d; u32 info = bcm2835_dma_prepare_cb_info(c, DMA_MEM_TO_MEM, false); - u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP; + u32 extra = bcm2835_dma_prepare_cb_extra(c, DMA_MEM_TO_MEM, false, + true, 0); size_t max_len = bcm2835_dma_max_frame_length(c); size_t frames; @@ -675,7 +699,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg( struct bcm2835_desc *d; dma_addr_t src = 0, dst = 0; u32 info = bcm2835_dma_prepare_cb_info(c, direction, false); - u32 extra = BCM2835_DMA_INT_EN; + u32 extra = bcm2835_dma_prepare_cb_extra(c, direction, false, true, 0); size_t frames; if (!is_slave_direction(direction)) { @@ -723,7 +747,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( dma_addr_t src, dst; u32 info = bcm2835_dma_prepare_cb_info(c, direction, buf_addr == od->zero_page); - u32 extra = 0; + u32 extra = bcm2835_dma_prepare_cb_extra(c, direction, true, true, 0); size_t max_len = bcm2835_dma_max_frame_length(c); size_t frames; @@ -739,9 +763,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( return NULL; } - if (flags & DMA_PREP_INTERRUPT) - extra |= BCM2835_DMA_INT_EN; - else + if (!(flags & DMA_PREP_INTERRUPT)) period_len = buf_len; /*