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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
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Inline Side-by-side
Showing with 113 additions and 67 deletions
drivers/pci/host/pci-tegra.c
View file @ da76ba50
......@@ -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,
......
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