PCI: dwc: Refactor dw_pcie_edma_find_chip() API
In order to add support for Hyper DMA (HDMA), refactor the existing dw_pcie_edma_find_chip() API by moving the common code to separate functions. No functional change. Suggested-by: Serge Semin <fancer.lancer@gmail.com> Link: https://lore.kernel.org/linux-pci/20240318-dw-hdma-v5-1-f04c5cdde760@linaro.org Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Frank Li <frank.li@nxp.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
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@ -880,7 +880,17 @@ static struct dw_edma_plat_ops dw_pcie_edma_ops = {
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.irq_vector = dw_pcie_edma_irq_vector,
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};
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static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
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static void dw_pcie_edma_init_data(struct dw_pcie *pci)
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{
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pci->edma.dev = pci->dev;
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if (!pci->edma.ops)
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pci->edma.ops = &dw_pcie_edma_ops;
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pci->edma.flags |= DW_EDMA_CHIP_LOCAL;
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}
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static int dw_pcie_edma_find_mf(struct dw_pcie *pci)
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{
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u32 val;
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@ -902,8 +912,6 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
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if (val == 0xFFFFFFFF && pci->edma.reg_base) {
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pci->edma.mf = EDMA_MF_EDMA_UNROLL;
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val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
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} else if (val != 0xFFFFFFFF) {
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pci->edma.mf = EDMA_MF_EDMA_LEGACY;
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@ -912,12 +920,14 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
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return -ENODEV;
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}
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pci->edma.dev = pci->dev;
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return 0;
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}
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if (!pci->edma.ops)
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pci->edma.ops = &dw_pcie_edma_ops;
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static int dw_pcie_edma_find_channels(struct dw_pcie *pci)
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{
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u32 val;
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pci->edma.flags |= DW_EDMA_CHIP_LOCAL;
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val = dw_pcie_readl_dma(pci, PCIE_DMA_CTRL);
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pci->edma.ll_wr_cnt = FIELD_GET(PCIE_DMA_NUM_WR_CHAN, val);
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pci->edma.ll_rd_cnt = FIELD_GET(PCIE_DMA_NUM_RD_CHAN, val);
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@ -930,6 +940,19 @@ static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
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return 0;
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}
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static int dw_pcie_edma_find_chip(struct dw_pcie *pci)
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{
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int ret;
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dw_pcie_edma_init_data(pci);
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ret = dw_pcie_edma_find_mf(pci);
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if (ret)
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return ret;
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return dw_pcie_edma_find_channels(pci);
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}
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static int dw_pcie_edma_irq_verify(struct dw_pcie *pci)
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{
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struct platform_device *pdev = to_platform_device(pci->dev);
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