[PATCH 10/10] PCI: tegra: Add power management support

Manikanta Maddireddy
2017-11-24T15:53:20Z

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: Manikanta Maddireddy <mmaddireddy-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
drivers/pci/host/pci-tegra.c | 174 ++++++++++++++++++++++++++-----------------
1 file changed, 106 insertions(+), 68 deletions(-)

diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index af999c650941..e443b3ebc4b5 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -1404,31 +1404,25 @@ 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;
}

axi_addr = pcie->soc->use_4k_conf_space ?
@@ -1436,21 +1430,21 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
pcie->cs = devm_request_mem_region(dev, axi_addr, SZ_4K, res->name);
if (!pcie->cs) {
err = -EADDRNOTAVAIL;
- goto poweroff;
+ goto phys_put;
}

pcie->cfg_va_base = devm_ioremap(dev, pcie->cs->start, SZ_4K);
if (!pcie->cfg_va_base) {
dev_err(pcie->dev, "failed to ioremap config space\n");
err = -EADDRNOTAVAIL;
- 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;
@@ -1458,13 +1452,11 @@ 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;

-poweroff:
- tegra_pcie_power_off(pcie);
phys_put:
if (soc->program_uphy)
tegra_pcie_phys_put(pcie);
@@ -1478,8 +1470,6 @@ 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);

@@ -1702,37 +1692,41 @@ static int tegra_pcie_enable_msi(struct tegra_pcie *pcie)
int err;
u32 reg;

- mutex_init(&msi->lock);
+ if (!msi->phys) {
+ mutex_init(&msi->lock);

- msi->chip.dev = dev;
- msi->chip.setup_irq = tegra_msi_setup_irq;
- msi->chip.teardown_irq = tegra_msi_teardown_irq;
+ msi->chip.dev = dev;
+ msi->chip.setup_irq = tegra_msi_setup_irq;
+ msi->chip.teardown_irq = tegra_msi_teardown_irq;

- msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
- &msi_domain_ops, &msi->chip);
- if (!msi->domain) {
- dev_err(dev, "failed to create IRQ domain\n");
- return -ENOMEM;
- }
+ msi->domain = irq_domain_add_linear(dev->of_node,
+ INT_PCI_MSI_NR,
+ &msi_domain_ops,
+ &msi->chip);
+ if (!msi->domain) {
+ dev_err(dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }

- err = platform_get_irq_byname(pdev, "msi");
- if (err < 0) {
- dev_err(dev, "failed to get IRQ: %d\n", err);
- goto err;
- }
+ err = platform_get_irq_byname(pdev, "msi");
+ if (err < 0) {
+ dev_err(dev, "failed to get IRQ: %d\n", err);
+ goto err;
+ }

- msi->irq = err;
+ msi->irq = err;

- err = request_irq(msi->irq, tegra_pcie_msi_irq, IRQF_NO_THREAD,
- tegra_msi_irq_chip.name, pcie);
- if (err < 0) {
- dev_err(dev, "failed to request IRQ: %d\n", err);
- goto err;
- }
+ err = request_irq(msi->irq, tegra_pcie_msi_irq, IRQF_NO_THREAD,
+ tegra_msi_irq_chip.name, pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to request IRQ: %d\n", err);
+ goto err;
+ }

- /* setup AFI/FPCI range */
- msi->pages = __get_free_pages(GFP_KERNEL, 0);
- msi->phys = virt_to_phys((void *)msi->pages);
+ /* setup AFI/FPCI range */
+ msi->pages = __get_free_pages(GFP_KERNEL, 0);
+ msi->phys = virt_to_phys((void *)msi->pages);
+ }

afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST);
@@ -2811,26 +2805,16 @@ static int tegra_pcie_probe(struct platform_device *pdev)
return err;
}

- err = tegra_pcie_enable_controller(pcie);
- if (err)
+ 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 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);
- if (err < 0) {
- dev_err(dev, "failed to enable MSI support: %d\n", err);
- goto free_resources;
- }
- }
-
- tegra_pcie_enable_ports(pcie);
+ goto pm_runtime_put;

pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
host->busnr = pcie->busn.start;
@@ -2842,7 +2826,7 @@ 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_msi;
+ goto free_resources;
}

pci_bus_size_bridges(host->bus);
@@ -2864,14 +2848,13 @@ static int tegra_pcie_probe(struct platform_device *pdev)

return 0;

-disable_msi:
- if (IS_ENABLED(CONFIG_PCI_MSI))
- tegra_pcie_disable_msi(pcie);
- tegra_pcie_disable_ports(pcie);
free_resources:
tegra_pcie_free_resources(pcie);
-disable_controller:
- tegra_pcie_disable_controller(pcie);
+pm_runtime_put:
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ tegra_pcie_disable_msi(pcie);
+ pm_runtime_put_sync(pcie->dev);
+ pm_runtime_disable(pcie->dev);
put_resources:
tegra_pcie_put_resources(pcie);
return err;
@@ -2881,7 +2864,6 @@ 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, *tmp;

if (IS_ENABLED(CONFIG_DEBUG_FS))
tegra_pcie_debugfs_exit(pcie);
@@ -2889,21 +2871,77 @@ static int tegra_pcie_remove(struct platform_device *pdev)
pci_remove_root_bus(host->bus);
if (IS_ENABLED(CONFIG_PCI_MSI))
tegra_pcie_disable_msi(pcie);
+ tegra_pcie_free_resources(pcie);
+ pm_runtime_put_sync(pcie->dev);
+ pm_runtime_disable(pcie->dev);
+ tegra_pcie_put_resources(pcie);
+
+ return 0;
+}
+
+static int tegra_pcie_pm_suspend(struct device *dev)
+{
+ struct tegra_pcie *pcie = dev_get_drvdata(dev);
+ struct tegra_pcie_port *port, *tmp;
+
list_for_each_entry_safe(port, tmp, &pcie->ports, list)
tegra_pcie_pme_turnoff(port);
tegra_pcie_disable_ports(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 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)) {
+ err = tegra_pcie_enable_msi(pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to enable MSI support: %d\n", err);
+ goto disable_controller;
+ }
+ }
+
+ tegra_pcie_enable_ports(pcie);
+
+ return 0;
+
+disable_controller:
+ tegra_pcie_disable_controller(pcie);
+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,
--
2.1.4

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