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dmaengine: dw-edma: Add PCI bus address getter to the remote EP glue driver

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The Synopsys PCIe Endpoint IP prototype kit can be attached via any PCI
host controller, including one where the PCI bus address space is different
from the CPU address space.  Therefore, we need to make sure the source and
destination addresses of the DMA slave devices are converted to the PCI bus
address space; otherwise DMA transactions may cause memory corruption.

Add a new dw_edma_pcie_address() interface to perform this translation by
using pcibios_resource_to_bus().

Link: https://lore.kernel.org/r/20230113171409.30470-9-Sergey.Semin@baikalelectronics.ru
Fixes: 41aaff2a2a ("dmaengine: Add Synopsys eDMA IP PCIe glue-logic")
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Serge Semin 2023-01-13 20:13:50 +03:00 committed by Lorenzo Pieralisi
parent 993d57bbaa
commit aa92fa1e53
1 changed files with 15 additions and 0 deletions
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15
drivers/dma/dw-edma/dw-edma-pcie.c
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@ -95,8 +95,23 @@ static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr)
return pci_irq_vector(to_pci_dev(dev), nr);
}
static u64 dw_edma_pcie_address(struct device *dev, phys_addr_t cpu_addr)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct pci_bus_region region;
struct resource res = {
.flags = IORESOURCE_MEM,
.start = cpu_addr,
.end = cpu_addr,
};
pcibios_resource_to_bus(pdev->bus, &region, &res);
return region.start;
}
static const struct dw_edma_core_ops dw_edma_pcie_core_ops = {
.irq_vector = dw_edma_pcie_irq_vector,
.pci_address = dw_edma_pcie_address,
};
static void dw_edma_pcie_get_vsec_dma_data(struct pci_dev *pdev,