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PCI: mobiveil: Add callback function for link up check

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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>
This commit is contained in:
Hou Zhiqiang 2020-02-13 12:06:37 +08:00 committed by Lorenzo Pieralisi
parent ed620e9654
commit fc99b3311a
2 changed files with 8 additions and 0 deletions
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3
drivers/pci/controller/mobiveil/pcie-mobiveil.c
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@ -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;
}

5
drivers/pci/controller/mobiveil/pcie-mobiveil.h
View File

@ -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;
};