Add support for the DMA controller in the DesignWare PCIe core
The DMA can transfer data to any remote address location
regardless PCI address space size.
Prepare struct dw_edma_chip() and call dw_edma_probe()
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
This patch depended on some ep enable patch for imx.
Change from v1 to v2
- rework commit message
- align dw_edma_chip change
drivers/pci/controller/dwc/pci-imx6.c | 51 +++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index efa8b81711090..7dc55986c947d 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -38,6 +38,7 @@
#include "../../pci.h"
#include "pcie-designware.h"
+#include "linux/dma/edma.h"
#define IMX8MQ_PCIE_LINK_CAP_REG_OFFSET 0x7c
#define IMX8MQ_PCIE_LINK_CAP_L1EL_64US GENMASK(18, 17)
@@ -164,6 +165,8 @@ struct imx6_pcie {
const struct imx6_pcie_drvdata *drvdata;
struct regulator *epdev_on;
struct phy *phy;
+
+ struct dw_edma_chip dma_chip;
};
/* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
@@ -2031,6 +2034,51 @@ static const struct dw_pcie_ep_ops pcie_ep_ops = {
.get_features = imx_pcie_ep_get_features,
};
+static int imx_dma_irq_vector(struct device *dev, unsigned int nr)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ return platform_get_irq_byname(pdev, "dma");
+}
+
+static struct dw_edma_core_ops dma_ops = {
+ .irq_vector = imx_dma_irq_vector,
+};
+
+static int imx_add_pcie_dma(struct imx6_pcie *imx6_pcie)
+{
+ unsigned int pcie_dma_offset;
+ struct dw_pcie *pci = imx6_pcie->pci;
+ struct device *dev = pci->dev;
+ struct dw_edma_chip *dma = &imx6_pcie->dma_chip;
+ int i = 0;
+ int sz = PAGE_SIZE;
+
+ pcie_dma_offset = 0x970;
+
+ dma->dev = dev;
+
+ dma->reg_base = pci->dbi_base + pcie_dma_offset;
+
+ dma->ops = &dma_ops;
+ dma->nr_irqs = 1;
+
+ dma->flags = DW_EDMA_CHIP_NO_MSI | DW_EDMA_CHIP_REG32BIT | DW_EDMA_CHIP_LOCAL_EP;
+
+ dma->ll_wr_cnt = dma->ll_rd_cnt=1;
+ dma->ll_region_wr[0].sz = sz;
+ dma->ll_region_wr[0].vaddr = dmam_alloc_coherent(dev, sz,
+ &dma->ll_region_wr[i].paddr,
+ GFP_KERNEL);
+
+ dma->ll_region_rd[0].sz = sz;
+ dma->ll_region_rd[0].vaddr = dmam_alloc_coherent(dev, sz,
+ &dma->ll_region_rd[i].paddr,
+ GFP_KERNEL);
+
+ return dw_edma_probe(dma);
+}
+
static int imx_add_pcie_ep(struct imx6_pcie *imx6_pcie,
struct platform_device *pdev)
{
@@ -2694,6 +2742,9 @@ static int imx6_pcie_probe(struct platform_device *pdev)
goto err_ret;
}
+ if (imx_add_pcie_dma(imx6_pcie))
+ dev_info(dev, "pci edma probe failure\n");
+
return 0;
err_ret:
--
2.24.0.rc1
