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author | Bjorn Helgaas <bhelgaas@google.com> | 2018-08-15 14:59:10 -0500 |
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committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-08-15 14:59:10 -0500 |
commit | 37f0e311bca66e9fe74703887c9bb4965914cabf (patch) | |
tree | 3be9f14dc28fe04e9823cc12d4bc11c9cf2a6af8 /drivers/pci/controller | |
parent | ce342a1aa8c61fe3315b782f6cf4f34d5babce13 (diff) | |
parent | eb1e39f784e83321353314da1b2e8cbb2fceaba9 (diff) | |
download | linux-stable-37f0e311bca66e9fe74703887c9bb4965914cabf.tar.gz linux-stable-37f0e311bca66e9fe74703887c9bb4965914cabf.tar.bz2 linux-stable-37f0e311bca66e9fe74703887c9bb4965914cabf.zip |
Merge branch 'remotes/lorenzo/pci/cadence'
- Correct the Cadence cdns_pcie_writel() signature (Alan Douglas)
- Add Cadence support for optional generic PHYs (Alan Douglas)
- Add Cadence power management ops (Alan Douglas)
- Remove redundant variable from Cadence driver (Colin Ian King)
* remotes/lorenzo/pci/cadence:
PCI: pcie-cadence-ep: Remove redundant variable mmc
PCI: cadence: Add shutdown callback to host driver
PCI: cadence: Add Power Management ops for host and EP
dt-bindings: PCI: cadence: Add DT bindings for optional PHYs
PCI: cadence: Add generic PHY support to host and EP drivers
PCI: cadence: Update cdns_pcie_writel() function signature
Diffstat (limited to 'drivers/pci/controller')
-rw-r--r-- | drivers/pci/controller/pcie-cadence-ep.c | 18 | ||||
-rw-r--r-- | drivers/pci/controller/pcie-cadence-host.c | 33 | ||||
-rw-r--r-- | drivers/pci/controller/pcie-cadence.c | 123 | ||||
-rw-r--r-- | drivers/pci/controller/pcie-cadence.h | 13 |
4 files changed, 183 insertions, 4 deletions
diff --git a/drivers/pci/controller/pcie-cadence-ep.c b/drivers/pci/controller/pcie-cadence-ep.c index e3fe4124e3af..04fe76c3d59d 100644 --- a/drivers/pci/controller/pcie-cadence-ep.c +++ b/drivers/pci/controller/pcie-cadence-ep.c @@ -238,7 +238,7 @@ static int cdns_pcie_ep_get_msi(struct pci_epc *epc, u8 fn) struct cdns_pcie_ep *ep = epc_get_drvdata(epc); struct cdns_pcie *pcie = &ep->pcie; u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET; - u16 flags, mmc, mme; + u16 flags, mme; /* Validate that the MSI feature is actually enabled. */ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS); @@ -249,7 +249,6 @@ static int cdns_pcie_ep_get_msi(struct pci_epc *epc, u8 fn) * Get the Multiple Message Enable bitfield from the Message Control * register. */ - mmc = (flags & PCI_MSI_FLAGS_QMASK) >> 1; mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4; return mme; @@ -439,6 +438,7 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev) struct pci_epc *epc; struct resource *res; int ret; + int phy_count; ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL); if (!ep) @@ -473,6 +473,12 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev) if (!ep->ob_addr) return -ENOMEM; + ret = cdns_pcie_init_phy(dev, pcie); + if (ret) { + dev_err(dev, "failed to init phy\n"); + return ret; + } + platform_set_drvdata(pdev, pcie); pm_runtime_enable(dev); ret = pm_runtime_get_sync(dev); if (ret < 0) { @@ -521,6 +527,10 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev) err_get_sync: pm_runtime_disable(dev); + cdns_pcie_disable_phy(pcie); + phy_count = pcie->phy_count; + while (phy_count--) + device_link_del(pcie->link[phy_count]); return ret; } @@ -528,6 +538,7 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev) static void cdns_pcie_ep_shutdown(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct cdns_pcie *pcie = dev_get_drvdata(dev); int ret; ret = pm_runtime_put_sync(dev); @@ -536,13 +547,14 @@ static void cdns_pcie_ep_shutdown(struct platform_device *pdev) pm_runtime_disable(dev); - /* The PCIe controller can't be disabled. */ + cdns_pcie_disable_phy(pcie); } static struct platform_driver cdns_pcie_ep_driver = { .driver = { .name = "cdns-pcie-ep", .of_match_table = cdns_pcie_ep_of_match, + .pm = &cdns_pcie_pm_ops, }, .probe = cdns_pcie_ep_probe, .shutdown = cdns_pcie_ep_shutdown, diff --git a/drivers/pci/controller/pcie-cadence-host.c b/drivers/pci/controller/pcie-cadence-host.c index a4ebbd37b553..ec394f6a19c8 100644 --- a/drivers/pci/controller/pcie-cadence-host.c +++ b/drivers/pci/controller/pcie-cadence-host.c @@ -58,6 +58,11 @@ static void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn, return pcie->reg_base + (where & 0xfff); } + /* Check that the link is up */ + if (!(cdns_pcie_readl(pcie, CDNS_PCIE_LM_BASE) & 0x1)) + return NULL; + /* Clear AXI link-down status */ + cdns_pcie_writel(pcie, CDNS_PCIE_AT_LINKDOWN, 0x0); /* Update Output registers for AXI region 0. */ addr0 = CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS(12) | @@ -239,6 +244,7 @@ static int cdns_pcie_host_probe(struct platform_device *pdev) struct cdns_pcie *pcie; struct resource *res; int ret; + int phy_count; bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc)); if (!bridge) @@ -290,6 +296,13 @@ static int cdns_pcie_host_probe(struct platform_device *pdev) } pcie->mem_res = res; + ret = cdns_pcie_init_phy(dev, pcie); + if (ret) { + dev_err(dev, "failed to init phy\n"); + return ret; + } + platform_set_drvdata(pdev, pcie); + pm_runtime_enable(dev); ret = pm_runtime_get_sync(dev); if (ret < 0) { @@ -322,15 +335,35 @@ static int cdns_pcie_host_probe(struct platform_device *pdev) err_get_sync: pm_runtime_disable(dev); + cdns_pcie_disable_phy(pcie); + phy_count = pcie->phy_count; + while (phy_count--) + device_link_del(pcie->link[phy_count]); return ret; } +static void cdns_pcie_shutdown(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cdns_pcie *pcie = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_put_sync(dev); + if (ret < 0) + dev_dbg(dev, "pm_runtime_put_sync failed\n"); + + pm_runtime_disable(dev); + cdns_pcie_disable_phy(pcie); +} + static struct platform_driver cdns_pcie_host_driver = { .driver = { .name = "cdns-pcie-host", .of_match_table = cdns_pcie_host_of_match, + .pm = &cdns_pcie_pm_ops, }, .probe = cdns_pcie_host_probe, + .shutdown = cdns_pcie_shutdown, }; builtin_platform_driver(cdns_pcie_host_driver); diff --git a/drivers/pci/controller/pcie-cadence.c b/drivers/pci/controller/pcie-cadence.c index 138d113eb45d..86f1b002c846 100644 --- a/drivers/pci/controller/pcie-cadence.c +++ b/drivers/pci/controller/pcie-cadence.c @@ -124,3 +124,126 @@ void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r) cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), 0); cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), 0); } + +void cdns_pcie_disable_phy(struct cdns_pcie *pcie) +{ + int i = pcie->phy_count; + + while (i--) { + phy_power_off(pcie->phy[i]); + phy_exit(pcie->phy[i]); + } +} + +int cdns_pcie_enable_phy(struct cdns_pcie *pcie) +{ + int ret; + int i; + + for (i = 0; i < pcie->phy_count; i++) { + ret = phy_init(pcie->phy[i]); + if (ret < 0) + goto err_phy; + + ret = phy_power_on(pcie->phy[i]); + if (ret < 0) { + phy_exit(pcie->phy[i]); + goto err_phy; + } + } + + return 0; + +err_phy: + while (--i >= 0) { + phy_power_off(pcie->phy[i]); + phy_exit(pcie->phy[i]); + } + + return ret; +} + +int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie) +{ + struct device_node *np = dev->of_node; + int phy_count; + struct phy **phy; + struct device_link **link; + int i; + int ret; + const char *name; + + phy_count = of_property_count_strings(np, "phy-names"); + if (phy_count < 1) { + dev_err(dev, "no phy-names. PHY will not be initialized\n"); + pcie->phy_count = 0; + return 0; + } + + phy = devm_kzalloc(dev, sizeof(*phy) * phy_count, GFP_KERNEL); + if (!phy) + return -ENOMEM; + + link = devm_kzalloc(dev, sizeof(*link) * phy_count, GFP_KERNEL); + if (!link) + return -ENOMEM; + + for (i = 0; i < phy_count; i++) { + of_property_read_string_index(np, "phy-names", i, &name); + phy[i] = devm_phy_optional_get(dev, name); + if (IS_ERR(phy)) + return PTR_ERR(phy); + + link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS); + if (!link[i]) { + ret = -EINVAL; + goto err_link; + } + } + + pcie->phy_count = phy_count; + pcie->phy = phy; + pcie->link = link; + + ret = cdns_pcie_enable_phy(pcie); + if (ret) + goto err_link; + + return 0; + +err_link: + while (--i >= 0) + device_link_del(link[i]); + + return ret; +} + +#ifdef CONFIG_PM_SLEEP +static int cdns_pcie_suspend_noirq(struct device *dev) +{ + struct cdns_pcie *pcie = dev_get_drvdata(dev); + + cdns_pcie_disable_phy(pcie); + + return 0; +} + +static int cdns_pcie_resume_noirq(struct device *dev) +{ + struct cdns_pcie *pcie = dev_get_drvdata(dev); + int ret; + + ret = cdns_pcie_enable_phy(pcie); + if (ret) { + dev_err(dev, "failed to enable phy\n"); + return ret; + } + + return 0; +} +#endif + +const struct dev_pm_ops cdns_pcie_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cdns_pcie_suspend_noirq, + cdns_pcie_resume_noirq) +}; diff --git a/drivers/pci/controller/pcie-cadence.h b/drivers/pci/controller/pcie-cadence.h index 4bb27333b05c..ae6bf2a2b3d3 100644 --- a/drivers/pci/controller/pcie-cadence.h +++ b/drivers/pci/controller/pcie-cadence.h @@ -8,6 +8,7 @@ #include <linux/kernel.h> #include <linux/pci.h> +#include <linux/phy/phy.h> /* * Local Management Registers @@ -165,6 +166,9 @@ #define CDNS_PCIE_AT_IB_RP_BAR_ADDR1(bar) \ (CDNS_PCIE_AT_BASE + 0x0804 + (bar) * 0x0008) +/* AXI link down register */ +#define CDNS_PCIE_AT_LINKDOWN (CDNS_PCIE_AT_BASE + 0x0824) + enum cdns_pcie_rp_bar { RP_BAR0, RP_BAR1, @@ -229,6 +233,9 @@ struct cdns_pcie { struct resource *mem_res; bool is_rc; u8 bus; + int phy_count; + struct phy **phy; + struct device_link **link; }; /* Register access */ @@ -279,7 +286,7 @@ static inline void cdns_pcie_ep_fn_writew(struct cdns_pcie *pcie, u8 fn, } static inline void cdns_pcie_ep_fn_writel(struct cdns_pcie *pcie, u8 fn, - u32 reg, u16 value) + u32 reg, u32 value) { writel(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg); } @@ -307,5 +314,9 @@ void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u8 fn, u32 r, u64 cpu_addr); void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r); +void cdns_pcie_disable_phy(struct cdns_pcie *pcie); +int cdns_pcie_enable_phy(struct cdns_pcie *pcie); +int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie); +extern const struct dev_pm_ops cdns_pcie_pm_ops; #endif /* _PCIE_CADENCE_H */ |