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Commit da76ba50 authored by Manikanta Maddireddy's avatar Manikanta Maddireddy Committed by Lorenzo Pieralisi
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PCI: tegra: Add power management support 



Tegra186 powergate driver is implemented as power domain driver, power
partition ungate/gate are registered as power_on/power_off callback
functions. There are no direct functions to power gate/ungate host
controller in Tegra186. Host controller driver should add "power-domains"
property in device tree and implement runtime suspend and resume
callback functons. Power gate and ungate is taken care by power domain
driver when host controller driver calls pm_runtime_put_sync and
pm_runtime_get_sync respectively.

Register suspend_noirq & resume_noirq callback functions to allow PCIe to
come up after resume from RAM. Both runtime and noirq pm ops share same
callback functions.

Signed-off-by: default avatarManikanta Maddireddy <mmaddireddy@nvidia.com>
[lorenzo.pieralisi@arm.com: squashed patch to fix compilation]
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Tested-by: default avatarThierry Reding <treding@nvidia.com>
parent 662b94c3

drivers/pci/host/pci-tegra.c

+113 −67
Original line number Diff line number Diff line
@@ -1280,31 +1280,25 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) 
		}

	}



	err = tegra_pcie_power_on(pcie);

	if (err) {

		dev_err(dev, "failed to power up: %d\n", err);

		goto phys_put;

	}



	pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");

	pcie->pads = devm_ioremap_resource(dev, pads);

	if (IS_ERR(pcie->pads)) {

		err = PTR_ERR(pcie->pads);

		goto poweroff;

		goto phys_put;

	}



	afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi");

	pcie->afi = devm_ioremap_resource(dev, afi);

	if (IS_ERR(pcie->afi)) {

		err = PTR_ERR(pcie->afi);

		goto poweroff;

		goto phys_put;

	}



	/* request configuration space, but remap later, on demand */

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");

	if (!res) {

		err = -EADDRNOTAVAIL;

		goto poweroff;

		goto phys_put;

	}



	pcie->cs = *res;
@@ -1315,14 +1309,14 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) 
	pcie->cfg = devm_ioremap_resource(dev, &pcie->cs);

	if (IS_ERR(pcie->cfg)) {

		err = PTR_ERR(pcie->cfg);

		goto poweroff;

		goto phys_put;

	}



	/* request interrupt */

	err = platform_get_irq_byname(pdev, "intr");

	if (err < 0) {

		dev_err(dev, "failed to get IRQ: %d\n", err);

		goto poweroff;

		goto phys_put;

	}



	pcie->irq = err;
@@ -1330,7 +1324,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) 
	err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);

	if (err) {

		dev_err(dev, "failed to register IRQ: %d\n", err);

		goto poweroff;

		goto phys_put;

	}



	return 0;
@@ -1338,8 +1332,6 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) 
phys_put:

	if (soc->program_uphy)

		tegra_pcie_phys_put(pcie);

poweroff:

	tegra_pcie_power_off(pcie);

	return err;

}
@@ -1350,8 +1342,6 @@ static int tegra_pcie_put_resources(struct tegra_pcie *pcie) 
	if (pcie->irq > 0)

		free_irq(pcie->irq, pcie);



	tegra_pcie_power_off(pcie);



	if (soc->program_uphy)

		tegra_pcie_phys_put(pcie);
@@ -1520,15 +1510,13 @@ static const struct irq_domain_ops msi_domain_ops = { 
	.map = tegra_msi_map,

};



static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)

static int tegra_pcie_msi_setup(struct tegra_pcie *pcie)

{

	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);

	struct platform_device *pdev = to_platform_device(pcie->dev);

	const struct tegra_pcie_soc *soc = pcie->soc;

	struct tegra_msi *msi = &pcie->msi;

	struct device *dev = pcie->dev;

	int err;

	u32 reg;



	mutex_init(&msi->lock);
@@ -1561,6 +1549,20 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) 
	/* setup AFI/FPCI range */

	msi->pages = __get_free_pages(GFP_KERNEL, 0);

	msi->phys = virt_to_phys((void *)msi->pages);

	host->msi = &msi->chip;



	return 0;



err:

	irq_domain_remove(msi->domain);

	return err;

}



static void tegra_pcie_enable_msi(struct tegra_pcie *pcie)

{

	const struct tegra_pcie_soc *soc = pcie->soc;

	struct tegra_msi *msi = &pcie->msi;

	u32 reg;



	afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);

	afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST);
@@ -1581,20 +1583,29 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) 
	reg = afi_readl(pcie, AFI_INTR_MASK);

	reg |= AFI_INTR_MASK_MSI_MASK;

	afi_writel(pcie, reg, AFI_INTR_MASK);

}



	host->msi = &msi->chip;

static void tegra_pcie_msi_teardown(struct tegra_pcie *pcie)

{

	struct tegra_msi *msi = &pcie->msi;

	unsigned int i, irq;



	return 0;

	free_pages(msi->pages, 0);



	if (msi->irq > 0)

		free_irq(msi->irq, pcie);



	for (i = 0; i < INT_PCI_MSI_NR; i++) {

		irq = irq_find_mapping(msi->domain, i);

		if (irq > 0)

			irq_dispose_mapping(irq);

	}



err:

	irq_domain_remove(msi->domain);

	return err;

}



static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)

{

	struct tegra_msi *msi = &pcie->msi;

	unsigned int i, irq;

	u32 value;



	/* mask the MSI interrupt */
@@ -1612,19 +1623,6 @@ static int tegra_pcie_disable_msi(struct tegra_pcie *pcie) 
	afi_writel(pcie, 0, AFI_MSI_EN_VEC6);

	afi_writel(pcie, 0, AFI_MSI_EN_VEC7);



	free_pages(msi->pages, 0);



	if (msi->irq > 0)

		free_irq(msi->irq, pcie);



	for (i = 0; i < INT_PCI_MSI_NR; i++) {

		irq = irq_find_mapping(msi->domain, i);

		if (irq > 0)

			irq_dispose_mapping(irq);

	}



	irq_domain_remove(msi->domain);



	return 0;

}
@@ -2123,10 +2121,8 @@ static void tegra_pcie_disable_ports(struct tegra_pcie *pcie) 
{

	struct tegra_pcie_port *port, *tmp;



	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {

	list_for_each_entry_safe(port, tmp, &pcie->ports, list)

		tegra_pcie_port_disable(port);

		tegra_pcie_port_free(port);

	}

}



static const struct tegra_pcie_port_soc tegra20_pcie_ports[] = {
@@ -2381,26 +2377,22 @@ static int tegra_pcie_probe(struct platform_device *pdev) 
		return err;

	}



	err = tegra_pcie_enable_controller(pcie);

	if (err)

		goto put_resources;



	err = tegra_pcie_request_resources(pcie);

	if (err)

		goto disable_controller;



	/* setup the AFI address translations */

	tegra_pcie_setup_translations(pcie);



	if (IS_ENABLED(CONFIG_PCI_MSI)) {

		err = tegra_pcie_enable_msi(pcie);

	err = tegra_pcie_msi_setup(pcie);

	if (err < 0) {

		dev_err(dev, "failed to enable MSI support: %d\n", err);

			goto free_resources;

		goto put_resources;

	}



	pm_runtime_enable(pcie->dev);

	err = pm_runtime_get_sync(pcie->dev);

	if (err) {

		dev_err(dev, "fail to enable pcie controller: %d\n", err);

		goto teardown_msi;

	}



	tegra_pcie_enable_ports(pcie);

	err = tegra_pcie_request_resources(pcie);

	if (err)

		goto pm_runtime_put;



	host->busnr = pcie->busn.start;

	host->dev.parent = &pdev->dev;
@@ -2411,7 +2403,7 @@ static int tegra_pcie_probe(struct platform_device *pdev) 
	err = pci_scan_root_bus_bridge(host);

	if (err < 0) {

		dev_err(dev, "failed to register host: %d\n", err);

		goto disable_ports;

		goto free_resources;

	}



	pci_bus_size_bridges(host->bus);
@@ -2430,14 +2422,13 @@ static int tegra_pcie_probe(struct platform_device *pdev) 


	return 0;



disable_ports:

	tegra_pcie_disable_ports(pcie);

	if (IS_ENABLED(CONFIG_PCI_MSI))

		tegra_pcie_disable_msi(pcie);

free_resources:

	tegra_pcie_free_resources(pcie);

disable_controller:

	tegra_pcie_disable_controller(pcie);

pm_runtime_put:

	pm_runtime_put_sync(pcie->dev);

	pm_runtime_disable(pcie->dev);

teardown_msi:

	tegra_pcie_msi_teardown(pcie);

put_resources:

	tegra_pcie_put_resources(pcie);

	return err;
@@ -2447,13 +2438,32 @@ static int tegra_pcie_remove(struct platform_device *pdev) 
{

	struct tegra_pcie *pcie = platform_get_drvdata(pdev);

	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);

	struct tegra_pcie_port *port;

	struct tegra_pcie_port *port, *tmp;



	if (IS_ENABLED(CONFIG_DEBUG_FS))

		tegra_pcie_debugfs_exit(pcie);



	pci_stop_root_bus(host->bus);

	pci_remove_root_bus(host->bus);

	tegra_pcie_free_resources(pcie);

	pm_runtime_put_sync(pcie->dev);

	pm_runtime_disable(pcie->dev);



	if (IS_ENABLED(CONFIG_PCI_MSI))

		tegra_pcie_msi_teardown(pcie);



	tegra_pcie_put_resources(pcie);



	list_for_each_entry_safe(port, tmp, &pcie->ports, list)

		tegra_pcie_port_free(port);



	return 0;

}



static int __maybe_unused tegra_pcie_pm_suspend(struct device *dev)

{

	struct tegra_pcie *pcie = dev_get_drvdata(dev);

	struct tegra_pcie_port *port;



	list_for_each_entry(port, &pcie->ports, list)

		tegra_pcie_pme_turnoff(port);
@@ -2463,18 +2473,54 @@ static int tegra_pcie_remove(struct platform_device *pdev) 
	if (IS_ENABLED(CONFIG_PCI_MSI))

		tegra_pcie_disable_msi(pcie);



	tegra_pcie_free_resources(pcie);

	tegra_pcie_disable_controller(pcie);

	tegra_pcie_put_resources(pcie);

	tegra_pcie_power_off(pcie);



	return 0;

}



static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)

{

	struct tegra_pcie *pcie = dev_get_drvdata(dev);

	int err;



	err = tegra_pcie_power_on(pcie);

	if (err) {

		dev_err(dev, "tegra pcie power on fail: %d\n", err);

		return err;

	}

	err = tegra_pcie_enable_controller(pcie);

	if (err) {

		dev_err(dev, "tegra pcie controller enable fail: %d\n", err);

		goto poweroff;

	}

	tegra_pcie_setup_translations(pcie);



	if (IS_ENABLED(CONFIG_PCI_MSI))

		tegra_pcie_enable_msi(pcie);



	tegra_pcie_enable_ports(pcie);



	return 0;



poweroff:

	tegra_pcie_power_off(pcie);



	return err;

}



static const struct dev_pm_ops tegra_pcie_pm_ops = {

	SET_RUNTIME_PM_OPS(tegra_pcie_pm_suspend, tegra_pcie_pm_resume, NULL)

	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_pcie_pm_suspend,

				      tegra_pcie_pm_resume)

};



static struct platform_driver tegra_pcie_driver = {

	.driver = {

		.name = "tegra-pcie",

		.of_match_table = tegra_pcie_of_match,

		.suppress_bind_attrs = true,

		.pm = &tegra_pcie_pm_ops,

	},

	.probe = tegra_pcie_probe,

	.remove = tegra_pcie_remove,