PCI: mediatek-gen3: Add mtk_gen3_pcie_pdata data structure

Introduce mtk_gen3_pcie_pdata data structure in order to define
multiple callbacks for each supported SoC.

This is a preliminary patch to introduce EN7581 PCIe support.

Link: https://lore.kernel.org/linux-pci/c193d1a87505d045e2e0ef33317bce17012ee095.1720022580.git.lorenzo@kernel.org
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Tested-by: Zhengping Zhang <zhengping.zhang@airoha.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Jianjun Wang <jianjun.wang@mediatek.com>

diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index b7e8e24f6a4085f5a13a1a05b612a3c15ce61d0e..9ac55771aba8a0adc285dcd3f7f5c90637d113f2 100644 (file)
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -100,6 +100,16 @@
 #define PCIE_ATR_TLP_TYPE_MEM          PCIE_ATR_TLP_TYPE(0)
 #define PCIE_ATR_TLP_TYPE_IO           PCIE_ATR_TLP_TYPE(2)
 
+struct mtk_gen3_pcie;
+
+/**
+ * struct mtk_gen3_pcie_pdata - differentiate between host generations
+ * @power_up: pcie power_up callback
+ */
+struct mtk_gen3_pcie_pdata {
+       int (*power_up)(struct mtk_gen3_pcie *pcie);
+};
+
 /**
  * struct mtk_msi_set - MSI information for each set
  * @base: IO mapped register base
@@ -131,6 +141,7 @@ struct mtk_msi_set {
  * @msi_sets: MSI sets information
  * @lock: lock protecting IRQ bit map
  * @msi_irq_in_use: bit map for assigned MSI IRQ
+ * @soc: pointer to SoC-dependent operations
  */
 struct mtk_gen3_pcie {
        struct device *dev;
@@ -151,6 +162,8 @@ struct mtk_gen3_pcie {
        struct mtk_msi_set msi_sets[PCIE_MSI_SET_NUM];
        struct mutex lock;
        DECLARE_BITMAP(msi_irq_in_use, PCIE_MSI_IRQS_NUM);
+
+       const struct mtk_gen3_pcie_pdata *soc;
 };
 
 /* LTSSM state in PCIE_LTSSM_STATUS_REG bit[28:24] */
@@ -904,7 +917,7 @@ static int mtk_pcie_setup(struct mtk_gen3_pcie *pcie)
        usleep_range(10, 20);
 
        /* Don't touch the hardware registers before power up */
-       err = mtk_pcie_power_up(pcie);
+       err = pcie->soc->power_up(pcie);
        if (err)
                return err;
 
@@ -939,6 +952,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
        pcie = pci_host_bridge_priv(host);
 
        pcie->dev = dev;
+       pcie->soc = device_get_match_data(dev);
        platform_set_drvdata(pdev, pcie);
 
        err = mtk_pcie_setup(pcie);
@@ -1054,7 +1068,7 @@ static int mtk_pcie_resume_noirq(struct device *dev)
        struct mtk_gen3_pcie *pcie = dev_get_drvdata(dev);
        int err;
 
-       err = mtk_pcie_power_up(pcie);
+       err = pcie->soc->power_up(pcie);
        if (err)
                return err;
 
@@ -1074,8 +1088,12 @@ static const struct dev_pm_ops mtk_pcie_pm_ops = {
                                  mtk_pcie_resume_noirq)
 };
 
+static const struct mtk_gen3_pcie_pdata mtk_pcie_soc_mt8192 = {
+       .power_up = mtk_pcie_power_up,
+};
+
 static const struct of_device_id mtk_pcie_of_match[] = {
-       { .compatible = "mediatek,mt8192-pcie" },
+       { .compatible = "mediatek,mt8192-pcie", .data = &mtk_pcie_soc_mt8192 },
        {},
 };
 MODULE_DEVICE_TABLE(of, mtk_pcie_of_match);