diff options
Diffstat (limited to 'drivers/pci/host/pci-thunder-pem.c')
| -rw-r--r-- | drivers/pci/host/pci-thunder-pem.c | 83 |
1 files changed, 75 insertions, 8 deletions
diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c index af722eb0ca75..b89c373555c5 100644 --- a/drivers/pci/host/pci-thunder-pem.c +++ b/drivers/pci/host/pci-thunder-pem.c @@ -14,6 +14,7 @@ * Copyright (C) 2015 - 2016 Cavium, Inc. */ +#include <linux/bitfield.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/of_address.h> @@ -36,7 +37,7 @@ struct thunder_pem_pci { static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { - u64 read_val; + u64 read_val, tmp_val; struct pci_config_window *cfg = bus->sysdata; struct thunder_pem_pci *pem_pci = (struct thunder_pem_pci *)cfg->priv; @@ -65,13 +66,28 @@ static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn, read_val |= 0x00007000; /* Skip MSI CAP */ break; case 0x70: /* Express Cap */ - /* PME interrupt on vector 2*/ - read_val |= (2u << 25); + /* + * Change PME interrupt to vector 2 on T88 where it + * reads as 0, else leave it alone. + */ + if (!(read_val & (0x1f << 25))) + read_val |= (2u << 25); break; case 0xb0: /* MSI-X Cap */ - /* TableSize=4, Next Cap is EA */ + /* TableSize=2 or 4, Next Cap is EA */ read_val &= 0xc00000ff; - read_val |= 0x0003bc00; + /* + * If Express Cap(0x70) raw PME vector reads as 0 we are on + * T88 and TableSize is reported as 4, else TableSize + * is 2. + */ + writeq(0x70, pem_pci->pem_reg_base + PEM_CFG_RD); + tmp_val = readq(pem_pci->pem_reg_base + PEM_CFG_RD); + tmp_val >>= 32; + if (!(tmp_val & (0x1f << 25))) + read_val |= 0x0003bc00; + else + read_val |= 0x0001bc00; break; case 0xb4: /* Table offset=0, BIR=0 */ @@ -319,6 +335,50 @@ static int thunder_pem_init(struct device *dev, struct pci_config_window *cfg, #if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS) +#define PEM_RES_BASE 0x87e0c0000000UL +#define PEM_NODE_MASK GENMASK(45, 44) +#define PEM_INDX_MASK GENMASK(26, 24) +#define PEM_MIN_DOM_IN_NODE 4 +#define PEM_MAX_DOM_IN_NODE 10 + +static void thunder_pem_reserve_range(struct device *dev, int seg, + struct resource *r) +{ + resource_size_t start = r->start, end = r->end; + struct resource *res; + const char *regionid; + + regionid = kasprintf(GFP_KERNEL, "PEM RC:%d", seg); + if (!regionid) + return; + + res = request_mem_region(start, end - start + 1, regionid); + if (res) + res->flags &= ~IORESOURCE_BUSY; + else + kfree(regionid); + + dev_info(dev, "%pR %s reserved\n", r, + res ? "has been" : "could not be"); +} + +static void thunder_pem_legacy_fw(struct acpi_pci_root *root, + struct resource *res_pem) +{ + int node = acpi_get_node(root->device->handle); + int index; + + if (node == NUMA_NO_NODE) + node = 0; + + index = root->segment - PEM_MIN_DOM_IN_NODE; + index -= node * PEM_MAX_DOM_IN_NODE; + res_pem->start = PEM_RES_BASE | FIELD_PREP(PEM_NODE_MASK, node) | + FIELD_PREP(PEM_INDX_MASK, index); + res_pem->end = res_pem->start + SZ_16M - 1; + res_pem->flags = IORESOURCE_MEM; +} + static int thunder_pem_acpi_init(struct pci_config_window *cfg) { struct device *dev = cfg->parent; @@ -331,10 +391,17 @@ static int thunder_pem_acpi_init(struct pci_config_window *cfg) if (!res_pem) return -ENOMEM; - ret = acpi_get_rc_resources(dev, "THRX0002", root->segment, res_pem); + ret = acpi_get_rc_resources(dev, "CAVA02B", root->segment, res_pem); + + /* + * If we fail to gather resources it means that we run with old + * FW where we need to calculate PEM-specific resources manually. + */ if (ret) { - dev_err(dev, "can't get rc base address\n"); - return ret; + thunder_pem_legacy_fw(root, res_pem); + /* Reserve PEM-specific resources and PCI configuration space */ + thunder_pem_reserve_range(dev, root->segment, res_pem); + thunder_pem_reserve_range(dev, root->segment, &cfg->res); } return thunder_pem_init(dev, cfg, res_pem); |