PCI: mobiveil: Add callback function for link up check

Platforms integrating the Mobiveil GPEX can implement a specific
mechanism to check the link status.

Add a callback to enable platform specific link status functions.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
[lorenzo.pieralisi@arm.com: updated log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>

diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.c b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
index 8215d7eeff4ef924521cd094b83fe0e0a720a271..23ab904989ea0781ef863c04d6756be0d11f7ab0 100644 (file)
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
@@ -125,6 +125,9 @@ void mobiveil_csr_write(struct mobiveil_pcie *pcie, u32 val, u32 off,
 
 bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie)
 {
+       if (pcie->ops->link_up)
+               return pcie->ops->link_up(pcie);
+
        return (mobiveil_csr_readl(pcie, LTSSM_STATUS) &
                LTSSM_STATUS_L0_MASK) == LTSSM_STATUS_L0;
 }

diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
index 1f7d9da765424acecd91316ffc38225c21638a58..63eec5618af2b94cdc7d01a45c8c6a678a7c82d0 100644 (file)
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
@@ -148,6 +148,10 @@ struct mobiveil_root_port {
        struct pci_host_bridge *bridge;
 };
 
+struct mobiveil_pab_ops {
+       int (*link_up)(struct mobiveil_pcie *pcie);
+};
+
 struct mobiveil_pcie {
        struct platform_device *pdev;
        void __iomem *csr_axi_slave_base;       /* root port config base */
@@ -157,6 +161,7 @@ struct mobiveil_pcie {
        int ppio_wins;
        int ob_wins_configured;         /* configured outbound windows */
        int ib_wins_configured;         /* configured inbound windows */
+       const struct mobiveil_pab_ops *ops;
        struct mobiveil_root_port rp;
 };