[PATCH v4 2/4] PCI: mediatek-gen3: Add mtk_gen3_pcie_pdata data structure

Lorenzo Bianconi
2024-07-03T16:13:18Z

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.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Zhengping Zhang <zhengping.zhang@airoha.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
drivers/pci/controller/pcie-mediatek-gen3.c | 24 ++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index 975b3024fb08..db0210803731 100644
--- 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);
--
2.45.2