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dmaengine: axi-dmac: add regmap support 

The registers for AXI DMAC are detailed at:
  https://wiki.analog.com/resources/fpga/docs/axi_dmac#register_map

This change adds regmap support for these registers, in case some wants to
have a more direct access to them via this interface.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
[vkoul: fixed code style issue]
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Alexandru Ardelean 2019-06-06 13:45:50 +03:00 committed by Vinod Koul
parent e28d915528
commit fc15be39a8
2 changed files with 42 additions and 0 deletions
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1
drivers/dma/Kconfig
View File

@ -102,6 +102,7 @@ config AXI_DMAC
depends on MICROBLAZE || NIOS2 || ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_SOCFPGA || COMPILE_TEST
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
select REGMAP_MMIO
help
Enable support for the Analog Devices AXI-DMAC peripheral. This DMA
controller is often used in Analog Device's reference designs for FPGA

41
drivers/dma/dma-axi-dmac.c
View File

@ -18,6 +18,7 @@
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/fpga/adi-axi-common.h>
@ -678,6 +679,44 @@ static void axi_dmac_desc_free(struct virt_dma_desc *vdesc)
kfree(container_of(vdesc, struct axi_dmac_desc, vdesc));
}
static bool axi_dmac_regmap_rdwr(struct device *dev, unsigned int reg)
{
switch (reg) {
case AXI_DMAC_REG_IRQ_MASK:
case AXI_DMAC_REG_IRQ_SOURCE:
case AXI_DMAC_REG_IRQ_PENDING:
case AXI_DMAC_REG_CTRL:
case AXI_DMAC_REG_TRANSFER_ID:
case AXI_DMAC_REG_START_TRANSFER:
case AXI_DMAC_REG_FLAGS:
case AXI_DMAC_REG_DEST_ADDRESS:
case AXI_DMAC_REG_SRC_ADDRESS:
case AXI_DMAC_REG_X_LENGTH:
case AXI_DMAC_REG_Y_LENGTH:
case AXI_DMAC_REG_DEST_STRIDE:
case AXI_DMAC_REG_SRC_STRIDE:
case AXI_DMAC_REG_TRANSFER_DONE:
case AXI_DMAC_REG_ACTIVE_TRANSFER_ID:
case AXI_DMAC_REG_STATUS:
case AXI_DMAC_REG_CURRENT_SRC_ADDR:
case AXI_DMAC_REG_CURRENT_DEST_ADDR:
case AXI_DMAC_REG_PARTIAL_XFER_LEN:
case AXI_DMAC_REG_PARTIAL_XFER_ID:
return true;
default:
return false;
}
}
static const struct regmap_config axi_dmac_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = AXI_DMAC_REG_PARTIAL_XFER_ID,
.readable_reg = axi_dmac_regmap_rdwr,
.writeable_reg = axi_dmac_regmap_rdwr,
};
/*
* The configuration stored in the devicetree matches the configuration
* parameters of the peripheral instance and allows the driver to know which
@ -882,6 +921,8 @@ static int axi_dmac_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dmac);
devm_regmap_init_mmio(&pdev->dev, dmac->base, &axi_dmac_regmap_config);
return 0;
err_unregister_of: