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Commit ab14d45e authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Bjorn Helgaas
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PCI: mvebu: Add suspend/resume support 



Add suspend/resume support for the mvebu PCIe host driver.  Without this
commit, the system will panic at resume time when PCIe devices are
connected.

Note that we have to use the ->suspend_noirq() and ->resume_noirq() hooks,
because at resume time, the PCI fixups are done at ->resume_noirq() time,
so the PCIe controller has to be ready at this point.

Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarJason Cooper <jason@lakedaemon.net>
parent c517d838

drivers/pci/host/pci-mvebu.c

+38 −0
Original line number Diff line number Diff line
@@ -129,6 +129,7 @@ struct mvebu_pcie_port { 
	size_t memwin_size;

	phys_addr_t iowin_base;

	size_t iowin_size;

	u32 saved_pcie_stat;

};



static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg)
@@ -899,6 +900,35 @@ static void mvebu_pcie_msi_enable(struct mvebu_pcie *pcie) 
		pcie->msi->dev = &pcie->pdev->dev;

}



static int mvebu_pcie_suspend(struct device *dev)

{

	struct mvebu_pcie *pcie;

	int i;



	pcie = dev_get_drvdata(dev);

	for (i = 0; i < pcie->nports; i++) {

		struct mvebu_pcie_port *port = pcie->ports + i;

		port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF);

	}



	return 0;

}



static int mvebu_pcie_resume(struct device *dev)

{

	struct mvebu_pcie *pcie;

	int i;



	pcie = dev_get_drvdata(dev);

	for (i = 0; i < pcie->nports; i++) {

		struct mvebu_pcie_port *port = pcie->ports + i;

		mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF);

		mvebu_pcie_setup_hw(port);

	}



	return 0;

}



static int mvebu_pcie_probe(struct platform_device *pdev)

{

	struct mvebu_pcie *pcie;
@@ -1056,6 +1086,8 @@ static int mvebu_pcie_probe(struct platform_device *pdev) 
	mvebu_pcie_msi_enable(pcie);

	mvebu_pcie_enable(pcie);



	platform_set_drvdata(pdev, pcie);



	return 0;

}
@@ -1068,12 +1100,18 @@ static const struct of_device_id mvebu_pcie_of_match_table[] = { 
};

MODULE_DEVICE_TABLE(of, mvebu_pcie_of_match_table);



static struct dev_pm_ops mvebu_pcie_pm_ops = {

	.suspend_noirq = mvebu_pcie_suspend,

	.resume_noirq = mvebu_pcie_resume,

};



static struct platform_driver mvebu_pcie_driver = {

	.driver = {

		.name = "mvebu-pcie",

		.of_match_table = mvebu_pcie_of_match_table,

		/* driver unloading/unbinding currently not supported */

		.suppress_bind_attrs = true,

		.pm = &mvebu_pcie_pm_ops,

	},

	.probe = mvebu_pcie_probe,

};