Commit d6b03171 authored by Frank Li's avatar Frank Li Committed by Bjorn Helgaas
Browse files

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

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: default avatarSerge Semin <fancer.lancer@gmail.com>
Tested-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: default avatarFrank Li <Frank.Li@nxp.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarSerge Semin <fancer.lancer@gmail.com>
Reviewed-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-By: default avatarVinod Koul <vkoul@kernel.org>
parent c1e33979

drivers/dma/dw-edma/dw-edma-v0-core.c

+6 −3
Original line number Diff line number Diff line
@@ -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 */

include/linux/dma/edma.h

+10 −0
Original line number Diff line number Diff line
@@ -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;