/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include #include "chip.h" #include "pch.h" /* Set bit in function disable register to hide this device */ static void pch_hide_devfn(unsigned int devfn) { struct device *dev = pcidev_path_on_root(devfn); if (dev) dev->hidden = true; switch (devfn) { case PCI_DEVFN(20, 0): /* xHCI */ if (pch_silicon_type() == PCH_TYPE_PPT) { /* on CPT this bit is reserved */ RCBA32_OR(FD, PCH_DISABLE_XHCI); } break; case PCI_DEVFN(22, 0): /* MEI #1 */ RCBA32_OR(FD2, PCH_DISABLE_MEI1); break; case PCI_DEVFN(22, 1): /* MEI #2 */ RCBA32_OR(FD2, PCH_DISABLE_MEI2); break; case PCI_DEVFN(22, 2): /* IDE-R */ RCBA32_OR(FD2, PCH_DISABLE_IDER); break; case PCI_DEVFN(22, 3): /* KT */ RCBA32_OR(FD2, PCH_DISABLE_KT); break; case PCI_DEVFN(25, 0): /* Gigabit Ethernet */ /* BUC is already handled in `early_pch.c`. */ break; case PCI_DEVFN(26, 0): /* EHCI #2 */ RCBA32_OR(FD, PCH_DISABLE_EHCI2); break; case PCI_DEVFN(27, 0): /* HD Audio Controller */ RCBA32_OR(FD, PCH_DISABLE_HD_AUDIO); break; case PCI_DEVFN(28, 0): /* PCI Express Root Port 1 */ case PCI_DEVFN(28, 1): /* PCI Express Root Port 2 */ case PCI_DEVFN(28, 2): /* PCI Express Root Port 3 */ case PCI_DEVFN(28, 3): /* PCI Express Root Port 4 */ case PCI_DEVFN(28, 4): /* PCI Express Root Port 5 */ case PCI_DEVFN(28, 5): /* PCI Express Root Port 6 */ case PCI_DEVFN(28, 6): /* PCI Express Root Port 7 */ case PCI_DEVFN(28, 7): /* PCI Express Root Port 8 */ RCBA32_OR(FD, PCH_DISABLE_PCIE(PCI_FUNC(devfn))); break; case PCI_DEVFN(29, 0): /* EHCI #1 */ RCBA32_OR(FD, PCH_DISABLE_EHCI1); break; case PCI_DEVFN(30, 0): /* PCI-to-PCI Bridge */ RCBA32_OR(FD, PCH_DISABLE_P2P); break; case PCI_DEVFN(31, 0): /* LPC */ RCBA32_OR(FD, PCH_DISABLE_LPC); break; case PCI_DEVFN(31, 2): /* SATA #1 */ RCBA32_OR(FD, PCH_DISABLE_SATA1); break; case PCI_DEVFN(31, 3): /* SMBUS */ RCBA32_OR(FD, PCH_DISABLE_SMBUS); break; case PCI_DEVFN(31, 5): /* SATA #22 */ RCBA32_OR(FD, PCH_DISABLE_SATA2); break; case PCI_DEVFN(31, 6): /* Thermal Subsystem */ RCBA32_OR(FD, PCH_DISABLE_THERMAL); break; } } /* Check if any port in set X to X+3 is enabled */ static int pch_pcie_check_set_enabled(struct device *dev) { struct device *port; int port_func; int dev_func = PCI_FUNC(dev->path.pci.devfn); printk(BIOS_DEBUG, "%s: check set enabled\n", dev_path(dev)); /* Go through static device tree list of devices * because enumeration is still in progress */ for (port = all_devices; port; port = port->next) { /* Only care about PCIe root ports */ if (PCI_SLOT(port->path.pci.devfn) != PCI_SLOT(dev->path.pci.devfn)) continue; /* Check if port is in range and enabled */ port_func = PCI_FUNC(port->path.pci.devfn); if (port_func >= dev_func && port_func < (dev_func + 4) && port->enabled) return 1; } /* None of the ports in this set are enabled */ return 0; } /* RPFN is a write-once register so keep a copy until it is written */ static u32 new_rpfn; /* Swap function numbers assigned to two PCIe Root Ports */ static void pch_pcie_function_swap(u8 old_fn, u8 new_fn) { u32 old_rpfn = new_rpfn; printk(BIOS_DEBUG, "PCH: Remap PCIe function %d to %d\n", old_fn, new_fn); new_rpfn &= ~(RPFN_FNMASK(old_fn) | RPFN_FNMASK(new_fn)); /* Old function set to new function and disabled */ new_rpfn |= RPFN_FNSET(old_fn, RPFN_FNGET(old_rpfn, new_fn)); new_rpfn |= RPFN_FNSET(new_fn, RPFN_FNGET(old_rpfn, old_fn)); } /* Update devicetree with new Root Port function number assignment */ static void pch_pcie_devicetree_update( struct southbridge_intel_bd82x6x_config *config) { struct device *dev; /* * hotplug map should also be updated along with their * corresponding port */ u8 new_hotplug_map[sizeof(config->pcie_hotplug_map)]; /* * Slots that didn't move need the hotplug setting copied too, * so "new_hotplug_map" is initialized with the values of the old map. */ memcpy(new_hotplug_map, config->pcie_hotplug_map, sizeof(new_hotplug_map)); /* Update the function numbers in the static devicetree */ for (dev = all_devices; dev; dev = dev->next) { u8 new_devfn; /* Only care about PCH PCIe root ports */ if (PCI_SLOT(dev->path.pci.devfn) != PCH_PCIE_DEV_SLOT) continue; /* Determine the new devfn for this port */ new_devfn = PCI_DEVFN(PCH_PCIE_DEV_SLOT, RPFN_FNGET(new_rpfn, PCI_FUNC(dev->path.pci.devfn))); if (dev->path.pci.devfn != new_devfn) { printk(BIOS_DEBUG, "PCH: PCIe map %02x.%1x -> %02x.%1x\n", PCI_SLOT(dev->path.pci.devfn), PCI_FUNC(dev->path.pci.devfn), PCI_SLOT(new_devfn), PCI_FUNC(new_devfn)); /* * Copy the flag to its new position along with * the corresponding port */ new_hotplug_map[PCI_FUNC(new_devfn)] = config->pcie_hotplug_map [PCI_FUNC(dev->path.pci.devfn)]; dev->path.pci.devfn = new_devfn; } } /* Copy the updated map back to its place */ memcpy(config->pcie_hotplug_map, new_hotplug_map, sizeof(new_hotplug_map)); } static void check_device_present(struct device *dev) { struct southbridge_intel_bd82x6x_config *config = dev->chip_info; struct stopwatch timeout; bool present, hot_plugable; uint32_t cap; /* Set slot implemented. */ cap = pci_find_capability(dev, PCI_CAP_ID_PCIE); pci_or_config16(dev, cap + PCI_EXP_FLAGS, PCI_EXP_FLAGS_SLOT); /* * By setting the PCI_EXP_FLAGS_SLOT bit in register PCI_EXP_FLAGS the * PCI_EXP_SLTSTA_PDS bit will be updated with in band device * detection from the PCIe PHY. While this is primarly used for PCIe * hot-plug detection, it is more reliable than probing for downstream * devices by reading DID/VID PCI registers of such. * * Usually the PCI_EXP_FLAGS_SLOT isn't set for integrated devices, * but to simplify device detection it's set for all ports. * * It also allows to detect device before PCI enumeration has run. */ hot_plugable = config && config->pcie_hotplug_map[PCI_FUNC(dev->path.pci.devfn)]; present = !!(pci_read_config16(dev, cap + PCI_EXP_SLTSTA) & PCI_EXP_SLTSTA_PDS); printk(BIOS_DEBUG, "%s: %s downstream device\n", dev_path(dev), present ? "Found a" : "No"); if (!present && !hot_plugable) { /* No device present. */ stopwatch_init_usecs_expire(&timeout, 50 * 1000); pci_or_config32(dev, 0x338, 1 << 26); while (!stopwatch_expired(&timeout)) { if ((pci_read_config32(dev, 0x328) & (0x1f << 23)) == 0) break; udelay(100); } dev->enabled = 0; } else if (present && !hot_plugable && !dev->enabled) { /* Port will be disabled, but device present. Disable link. */ pci_or_config32(dev, cap + PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_LD); } } /* Special handling for PCIe Root Port devices */ static void pch_pcie_enable(struct device *dev) { struct southbridge_intel_bd82x6x_config *config = dev->chip_info; if (!config) return; check_device_present(dev); /* * Save a copy of the Root Port Function Number map when * starting to walk the list of PCIe Root Ports so it can * be updated locally and written out when the last port * has been processed. */ if (PCI_FUNC(dev->path.pci.devfn) == 0) { new_rpfn = RCBA32(RPFN); /* * Enable Root Port coalescing if the first port is disabled * or the other devices will not be enumerated by the OS. */ if (!dev->enabled) config->pcie_port_coalesce = true; if (config->pcie_port_coalesce) printk(BIOS_INFO, "PCH: PCIe Root Port coalescing is enabled\n"); } if (!dev->enabled) { printk(BIOS_DEBUG, "%s: Disabling device\n", dev_path(dev)); /* * PCIE Power Savings for PantherPoint and CougarPoint/B1+ * * If PCIe 0-3 disabled set Function 0 0xE2[0] = 1 * If PCIe 4-7 disabled set Function 4 0xE2[0] = 1 * * This check is done here instead of PCIe driver * because the PCIe driver enable() handler is not * called unless the device is enabled. */ if ((PCI_FUNC(dev->path.pci.devfn) == 0 || PCI_FUNC(dev->path.pci.devfn) == 4)) { /* Handle workaround for PPT and CPT/B1+ */ if (pch_silicon_supported(PCH_TYPE_CPT, PCH_STEP_B1) && !pch_pcie_check_set_enabled(dev)) { pci_or_config8(dev, 0xe2, 1); } /* * Enable Clock Gating for shared PCIe resources * before disabling this particular port. */ pci_write_config8(dev, 0xe1, 0x3c); } /* Ensure memory, io, and bus master are all disabled */ pci_and_config16(dev, PCI_COMMAND, ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO)); /* Do not claim downstream transactions for PCIe ports */ new_rpfn |= RPFN_HIDE(PCI_FUNC(dev->path.pci.devfn)); /* Hide this device if possible */ pch_hide_devfn(dev->path.pci.devfn); } else { int fn; /* * Check if there is a lower disabled port to swap with this * port in order to maintain linear order starting at zero. */ if (config->pcie_port_coalesce) { for (fn=0; fn < PCI_FUNC(dev->path.pci.devfn); fn++) { if (!(new_rpfn & RPFN_HIDE(fn))) continue; /* Swap places with this function */ pch_pcie_function_swap( PCI_FUNC(dev->path.pci.devfn), fn); break; } } /* Enable SERR */ pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_SERR); } /* * When processing the last PCIe root port we can now * update the Root Port Function Number and Hide register. */ if (PCI_FUNC(dev->path.pci.devfn) == 7) { printk(BIOS_SPEW, "PCH: RPFN 0x%08x -> 0x%08x\n", RCBA32(RPFN), new_rpfn); RCBA32(RPFN) = new_rpfn; /* Update static devictree with new function numbers */ if (config->pcie_port_coalesce) pch_pcie_devicetree_update(config); } } void pch_enable(struct device *dev) { /* PCH PCIe Root Ports get special handling */ if (PCI_SLOT(dev->path.pci.devfn) == PCH_PCIE_DEV_SLOT) return pch_pcie_enable(dev); if (!dev->enabled) { printk(BIOS_DEBUG, "%s: Disabling device\n", dev_path(dev)); /* Ensure memory, io, and bus master are all disabled */ pci_and_config16(dev, PCI_COMMAND, ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO)); /* Hide this device if possible */ pch_hide_devfn(dev->path.pci.devfn); } else { /* Enable SERR */ pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_SERR); } } struct chip_operations southbridge_intel_bd82x6x_ops = { CHIP_NAME("Intel Series 6/7 (Cougar Point/Panther Point) Southbridge") .enable_dev = pch_enable, };