[PATCHv9 06/12] PCI: mobiveil: Add callback function for link up check

Z.q. Hou
2019-11-20T03:46:03Z

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

The platforms, in which the Mobiveil GPEX is integrated,
may have their specific mechanism to check link up status.
This patch is to enable these platforms to implement theirs.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
V9:
- New patch splited from the #1 of V8 patches to make it easy to review.

drivers/pci/controller/mobiveil/pcie-mobiveil.c | 3 +++
drivers/pci/controller/mobiveil/pcie-mobiveil.h | 5 +++++
2 files changed, 8 insertions(+)

diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.c b/drivers/pci/controller/mobiveil/pcie-mobiveil.c
index 2773f823c9ea..b9ed2d95641c 100644
--- 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 18d85806a7fc..95d2e7c809b8 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
@@ -148,6 +148,10 @@ struct 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 root_port rp;
};

--
2.17.1