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dmaengine: dw-edma: Add support for chip-specific flags

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Add a "flags" field to the "struct dw_edma_chip" so that the controller
drivers can pass flags that are relevant to the platform.

DW_EDMA_CHIP_LOCAL - Used by the controller drivers accessing eDMA
locally. Local eDMA access doesn't require generating MSIs to the remote.

Link: https://lore.kernel.org/r/20220524152159.2370739-8-Frank.Li@nxp.com
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-By: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Frank Li 2022-05-24 10:21:58 -05:00 committed by Bjorn Helgaas
parent c1e3397917
commit d6b03171f9
2 changed files with 16 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/dma/dw-edma/dw-edma-v0-core.c
View File

@ -301,6 +301,7 @@ u32 dw_edma_v0_core_status_abort_int(struct dw_edma *dw, enum dw_edma_dir dir)
static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
{
struct dw_edma_burst *child;
struct dw_edma_chan *chan = chunk->chan;
struct dw_edma_v0_lli __iomem *lli;
struct dw_edma_v0_llp __iomem *llp;
u32 control = 0, i = 0;
@ -314,9 +315,11 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
j = chunk->bursts_alloc;
list_for_each_entry(child, &chunk->burst->list, list) {
j--;
if (!j)
control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE);
if (!j) {
control |= DW_EDMA_V0_LIE;
if (!(chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL))
control |= DW_EDMA_V0_RIE;
}
/* Channel control */
SET_LL_32(&lli[i].control, control);
/* Transfer size */

10
include/linux/dma/edma.h
View File

@ -33,12 +33,21 @@ enum dw_edma_map_format {
EDMA_MF_HDMA_COMPAT = 0x5
};
/**
* enum dw_edma_chip_flags - Flags specific to an eDMA chip
* @DW_EDMA_CHIP_LOCAL: eDMA is used locally by an endpoint
*/
enum dw_edma_chip_flags {
DW_EDMA_CHIP_LOCAL = BIT(0),
};
/**
* struct dw_edma_chip - representation of DesignWare eDMA controller hardware
* @dev: struct device of the eDMA controller
* @id: instance ID
* @nr_irqs: total number of DMA IRQs
* @ops DMA channel to IRQ number mapping
* @flags dw_edma_chip_flags
* @reg_base DMA register base address
* @ll_wr_cnt DMA write link list count
* @ll_rd_cnt DMA read link list count
@ -55,6 +64,7 @@ struct dw_edma_chip {
int id;
int nr_irqs;
const struct dw_edma_core_ops *ops;
u32 flags;
void __iomem *reg_base;