PCIe controllers in X-Gene SoCs is not ECAM compliant: software needs to configure additional controller's register to address device at bus:dev:function. The quirk will only be applied for X-Gene PCIe MCFG table with OEM revison 1, 2, 3 or 4 (PCIe controller v1 and v2 on X-Gene SoCs). The quirk declares the X-Gene PCIe controller register space as 64KB fixed memory resource with name "PCIe CSR". This name will be showed next to the resource range in the output of "cat /proc/iomem". Signed-off-by: Duc Dang <dhdang@xxxxxxx> --- v3: - Rebase on top of pci/ecam-v6 tree. - Use DEFINE_RES_MEM_NAMED to declare controller register space with name "PCIe CSR" v2: RFC v2: https://patchwork.ozlabs.org/patch/686846/ v1: RFC v1: https://patchwork.kernel.org/patch/9337115/ drivers/acpi/pci_mcfg.c | 31 ++++++++ drivers/pci/host/pci-xgene.c | 165 ++++++++++++++++++++++++++++++++++++++++++- include/linux/pci-ecam.h | 7 ++ 3 files changed, 200 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c index ac21db3..eb6125b 100644 --- a/drivers/acpi/pci_mcfg.c +++ b/drivers/acpi/pci_mcfg.c @@ -57,6 +57,37 @@ struct mcfg_fixup { { "QCOM ", "QDF2432 ", 1, 5, MCFG_BUS_ANY, &pci_32b_ops }, { "QCOM ", "QDF2432 ", 1, 6, MCFG_BUS_ANY, &pci_32b_ops }, { "QCOM ", "QDF2432 ", 1, 7, MCFG_BUS_ANY, &pci_32b_ops }, + +#ifdef CONFIG_PCI_XGENE +#define XGENE_V1_ECAM_MCFG(rev, seg) \ + {"APM ", "XGENE ", rev, seg, MCFG_BUS_ANY, \ + &xgene_v1_pcie_ecam_ops } +#define XGENE_V2_1_ECAM_MCFG(rev, seg) \ + {"APM ", "XGENE ", rev, seg, MCFG_BUS_ANY, \ + &xgene_v2_1_pcie_ecam_ops } +#define XGENE_V2_2_ECAM_MCFG(rev, seg) \ + {"APM ", "XGENE ", rev, seg, MCFG_BUS_ANY, \ + &xgene_v2_2_pcie_ecam_ops } + + /* X-Gene SoC with v1 PCIe controller */ + XGENE_V1_ECAM_MCFG(1, 0), + XGENE_V1_ECAM_MCFG(1, 1), + XGENE_V1_ECAM_MCFG(1, 2), + XGENE_V1_ECAM_MCFG(1, 3), + XGENE_V1_ECAM_MCFG(1, 4), + XGENE_V1_ECAM_MCFG(2, 0), + XGENE_V1_ECAM_MCFG(2, 1), + XGENE_V1_ECAM_MCFG(2, 2), + XGENE_V1_ECAM_MCFG(2, 3), + XGENE_V1_ECAM_MCFG(2, 4), + /* X-Gene SoC with v2.1 PCIe controller */ + XGENE_V2_1_ECAM_MCFG(3, 0), + XGENE_V2_1_ECAM_MCFG(3, 1), + /* X-Gene SoC with v2.2 PCIe controller */ + XGENE_V2_2_ECAM_MCFG(4, 0), + XGENE_V2_2_ECAM_MCFG(4, 1), + XGENE_V2_2_ECAM_MCFG(4, 2), +#endif }; static char mcfg_oem_id[ACPI_OEM_ID_SIZE]; diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c index 1de23d7..43d7c69 100644 --- a/drivers/pci/host/pci-xgene.c +++ b/drivers/pci/host/pci-xgene.c @@ -27,6 +27,8 @@ #include <linux/of_irq.h> #include <linux/of_pci.h> #include <linux/pci.h> +#include <linux/pci-acpi.h> +#include <linux/pci-ecam.h> #include <linux/platform_device.h> #include <linux/slab.h> @@ -64,6 +66,7 @@ /* PCIe IP version */ #define XGENE_PCIE_IP_VER_UNKN 0 #define XGENE_PCIE_IP_VER_1 1 +#define XGENE_PCIE_IP_VER_2 2 struct xgene_pcie_port { struct device_node *node; @@ -97,7 +100,15 @@ static inline u32 pcie_bar_low_val(u32 addr, u32 flags) */ static void __iomem *xgene_pcie_get_cfg_base(struct pci_bus *bus) { - struct xgene_pcie_port *port = bus->sysdata; + struct pci_config_window *cfg; + struct xgene_pcie_port *port; + + if (acpi_disabled) + port = bus->sysdata; + else { + cfg = bus->sysdata; + port = cfg->priv; + } if (bus->number >= (bus->primary + 1)) return port->cfg_base + AXI_EP_CFG_ACCESS; @@ -111,10 +122,18 @@ static void __iomem *xgene_pcie_get_cfg_base(struct pci_bus *bus) */ static void xgene_pcie_set_rtdid_reg(struct pci_bus *bus, uint devfn) { - struct xgene_pcie_port *port = bus->sysdata; + struct pci_config_window *cfg; + struct xgene_pcie_port *port; unsigned int b, d, f; u32 rtdid_val = 0; + if (acpi_disabled) + port = bus->sysdata; + else { + cfg = bus->sysdata; + port = cfg->priv; + } + b = bus->number; d = PCI_SLOT(devfn); f = PCI_FUNC(devfn); @@ -158,7 +177,15 @@ static void __iomem *xgene_pcie_map_bus(struct pci_bus *bus, unsigned int devfn, static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { - struct xgene_pcie_port *port = bus->sysdata; + struct pci_config_window *cfg; + struct xgene_pcie_port *port; + + if (acpi_disabled) + port = bus->sysdata; + else { + cfg = bus->sysdata; + port = cfg->priv; + } if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val) != PCIBIOS_SUCCESSFUL) @@ -189,6 +216,138 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn, .write = pci_generic_config_write32, }; +#ifdef CONFIG_ACPI +static struct resource xgene_v1_csr_res[] = { + [0] = DEFINE_RES_MEM_NAMED(0x1f2b0000UL, SZ_64K, "PCIe CSR"), + [1] = DEFINE_RES_MEM_NAMED(0x1f2c0000UL, SZ_64K, "PCIe CSR"), + [2] = DEFINE_RES_MEM_NAMED(0x1f2d0000UL, SZ_64K, "PCIe CSR"), + [3] = DEFINE_RES_MEM_NAMED(0x1f500000UL, SZ_64K, "PCIe CSR"), + [4] = DEFINE_RES_MEM_NAMED(0x1f510000UL, SZ_64K, "PCIe CSR"), +}; + +static int xgene_v1_pcie_ecam_init(struct pci_config_window *cfg) +{ + struct acpi_device *adev = to_acpi_device(cfg->parent); + struct acpi_pci_root *root = acpi_driver_data(adev); + struct device *dev = cfg->parent; + struct xgene_pcie_port *port; + struct resource *csr; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + csr = &xgene_v1_csr_res[root->segment]; + port->csr_base = devm_ioremap_resource(dev, csr); + if (IS_ERR(port->csr_base)) { + kfree(port); + return -ENOMEM; + } + + port->cfg_base = cfg->win; + port->version = XGENE_PCIE_IP_VER_1; + + cfg->priv = port; + + return 0; +} + +struct pci_ecam_ops xgene_v1_pcie_ecam_ops = { + .bus_shift = 16, + .init = xgene_v1_pcie_ecam_init, + .pci_ops = { + .map_bus = xgene_pcie_map_bus, + .read = xgene_pcie_config_read32, + .write = pci_generic_config_write, + } +}; + +static struct resource xgene_v2_1_csr_res[] = { + [0] = DEFINE_RES_MEM_NAMED(0x1f2b0000UL, SZ_64K, "PCIe CSR"), + [1] = DEFINE_RES_MEM_NAMED(0x1f2c0000UL, SZ_64K, "PCIe CSR"), +}; + +static int xgene_v2_1_pcie_ecam_init(struct pci_config_window *cfg) +{ + struct acpi_device *adev = to_acpi_device(cfg->parent); + struct acpi_pci_root *root = acpi_driver_data(adev); + struct device *dev = cfg->parent; + struct xgene_pcie_port *port; + struct resource *csr; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + csr = &xgene_v2_1_csr_res[root->segment]; + port->csr_base = devm_ioremap_resource(dev, csr); + if (IS_ERR(port->csr_base)) { + kfree(port); + return -ENOMEM; + } + + port->cfg_base = cfg->win; + port->version = XGENE_PCIE_IP_VER_2; + + cfg->priv = port; + + return 0; +} + +struct pci_ecam_ops xgene_v2_1_pcie_ecam_ops = { + .bus_shift = 16, + .init = xgene_v2_1_pcie_ecam_init, + .pci_ops = { + .map_bus = xgene_pcie_map_bus, + .read = xgene_pcie_config_read32, + .write = pci_generic_config_write, + } +}; + +static struct resource xgene_v2_2_csr_res[] = { + [0] = DEFINE_RES_MEM_NAMED(0x1f2b0000UL, SZ_64K, "PCIe CSR"), + [1] = DEFINE_RES_MEM_NAMED(0x1f500000UL, SZ_64K, "PCIe CSR"), + [2] = DEFINE_RES_MEM_NAMED(0x1f2d0000UL, SZ_64K, "PCIe CSR"), +}; + +static int xgene_v2_2_pcie_ecam_init(struct pci_config_window *cfg) +{ + struct acpi_device *adev = to_acpi_device(cfg->parent); + struct acpi_pci_root *root = acpi_driver_data(adev); + struct device *dev = cfg->parent; + struct xgene_pcie_port *port; + struct resource *csr; + + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + csr = &xgene_v2_2_csr_res[root->segment]; + port->csr_base = devm_ioremap_resource(dev, csr); + if (IS_ERR(port->csr_base)) { + kfree(port); + return -ENOMEM; + } + + port->cfg_base = cfg->win; + port->version = XGENE_PCIE_IP_VER_2; + + cfg->priv = port; + + return 0; +} + +struct pci_ecam_ops xgene_v2_2_pcie_ecam_ops = { + .bus_shift = 16, + .init = xgene_v2_2_pcie_ecam_init, + .pci_ops = { + .map_bus = xgene_pcie_map_bus, + .read = xgene_pcie_config_read32, + .write = pci_generic_config_write, + } +}; +#endif + static u64 xgene_pcie_set_ib_mask(struct xgene_pcie_port *port, u32 addr, u32 flags, u64 size) { diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h index f5740b7..47ab947 100644 --- a/include/linux/pci-ecam.h +++ b/include/linux/pci-ecam.h @@ -62,6 +62,13 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn, /* ops for buggy ECAM that supports only 32-bit accesses */ extern struct pci_ecam_ops pci_32b_ops; +/* ECAM ops for known quirks */ +#ifdef CONFIG_PCI_XGENE +extern struct pci_ecam_ops xgene_v1_pcie_ecam_ops; +extern struct pci_ecam_ops xgene_v2_1_pcie_ecam_ops; +extern struct pci_ecam_ops xgene_v2_2_pcie_ecam_ops; +#endif + #ifdef CONFIG_PCI_HOST_GENERIC /* for DT-based PCI controllers that support ECAM */ int pci_host_common_probe(struct platform_device *pdev, -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
