/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include #include #include "chip.h" #include "pch.h" static const char *pch_pcie_acpi_name(const struct device *dev) { ASSERT(dev); if (PCI_SLOT(dev->path.pci.devfn) == 0x1c) { static const char *names[] = { "RP01", "RP02", "RP03", "RP04", "RP05", "RP06", "RP07", "RP08"}; return names[PCI_FUNC(dev->path.pci.devfn)]; } return NULL; } static bool pci_is_hotplugable(struct device *dev) { struct southbridge_intel_bd82x6x_config *config = dev->chip_info; return config && config->pcie_hotplug_map[PCI_FUNC(dev->path.pci.devfn)]; } static void pch_pcie_pm_early(struct device *dev) { u16 link_width_p0, link_width_p4; struct device *child = NULL; u8 slot_power_limit = 10; /* 10W for x1 */ static u8 slot_number = 1; u32 reg32, cap; u8 reg8; reg32 = RCBA32(RPC); /* Port 0-3 link aggregation from PCIEPCS1[1:0] soft strap */ switch (reg32 & 3) { case 3: link_width_p0 = 4; break; case 1: case 2: link_width_p0 = 2; break; case 0: default: link_width_p0 = 1; } /* Port 4-7 link aggregation from PCIEPCS2[1:0] soft strap */ switch ((reg32 >> 2) & 3) { case 3: link_width_p4 = 4; break; case 1: case 2: link_width_p4 = 2; break; case 0: default: link_width_p4 = 1; } /* Enable dynamic clock gating where needed */ reg8 = pci_read_config8(dev, 0xe1); switch (PCI_FUNC(dev->path.pci.devfn)) { case 0: /* Port 0 */ if (link_width_p0 == 4) slot_power_limit = 40; /* 40W for x4 */ else if (link_width_p0 == 2) slot_power_limit = 20; /* 20W for x2 */ reg8 |= 0x3f; break; case 4: /* Port 4 */ if (link_width_p4 == 4) slot_power_limit = 40; /* 40W for x4 */ else if (link_width_p4 == 2) slot_power_limit = 20; /* 20W for x2 */ reg8 |= 0x3f; break; case 1: /* Port 1 only if Port 0 is x1 */ if (link_width_p0 == 1) reg8 |= 0x3; break; case 2: /* Port 2 only if Port 0 is x1 or x2 */ case 3: /* Port 3 only if Port 0 is x1 or x2 */ if (link_width_p0 <= 2) reg8 |= 0x3; break; case 5: /* Port 5 only if Port 4 is x1 */ if (link_width_p4 == 1) reg8 |= 0x3; break; case 6: /* Port 7 only if Port 4 is x1 or x2 */ case 7: /* Port 7 only if Port 4 is x1 or x2 */ if (link_width_p4 <= 2) reg8 |= 0x3; break; } pci_write_config8(dev, 0xe1, reg8); /* Set 0xE8[0] = 1 */ pci_or_config32(dev, 0xe8, 1); /* Adjust Common Clock exit latency */ reg32 = pci_read_config32(dev, 0xd8); reg32 &= ~(1 << 17); reg32 |= (1 << 16) | (1 << 15); reg32 &= ~(1 << 31); /* Disable PME# SCI for native PME handling */ pci_write_config32(dev, 0xd8, reg32); cap = pci_find_capability(dev, PCI_CAP_ID_PCIE); /* Adjust ASPM L1 exit latency */ reg32 = pci_read_config32(dev, cap + PCI_EXP_LNKCAP); reg32 &= ~PCI_EXP_LNKCAP_L1EL; if (RCBA32(CIR9) & (1 << 16)) { /* If RCBA+2320[15]=1 set ASPM L1 to 8-16us */ reg32 |= (4 << 15); } else { /* Else set ASPM L1 to 2-4us */ reg32 |= (2 << 15); } pci_write_config32(dev, cap + PCI_EXP_LNKCAP, reg32); /* * PCI device enumeration hasn't started yet, thus any downstream device here * must be a static device from devicetree.cb. * If one is found assume it's an integrated device and not a PCIe slot. */ if (dev->link_list) child = pcidev_path_behind(dev->link_list, PCI_DEVFN(0, 0)); /* Set slot power limit as configured above */ reg32 = pci_read_config32(dev, cap + PCI_EXP_SLTCAP); if (pci_is_hotplugable(dev)) reg32 |= (PCI_EXP_SLTCAP_HPS | PCI_EXP_SLTCAP_HPC); else reg32 &= ~(PCI_EXP_SLTCAP_HPS | PCI_EXP_SLTCAP_HPC); reg32 &= ~PCI_EXP_SLTCAP_SPLS; /* 16:15 = Slot power scale */ reg32 &= ~PCI_EXP_SLTCAP_SPLV; /* 14:7 = Slot power limit */ reg32 &= ~PCI_EXP_SLTCAP_PSN; if (!child || !child->on_mainboard) { /* Only PCIe slots have a power limit and slot number */ reg32 |= (slot_power_limit << 7); reg32 |= (slot_number++ << 19); } pci_write_config32(dev, cap + PCI_EXP_SLTCAP, reg32); } static void pch_pcie_pm_late(struct device *dev) { struct southbridge_intel_bd82x6x_config *config = dev->chip_info; enum aspm_type apmc = 0; /* Set 0x314 = 0x743a361b */ pci_write_config32(dev, 0x314, 0x743a361b); /* Set 0x318[31:16] = 0x1414 */ pci_update_config32(dev, 0x318, 0x0000ffff, 0x14140000); /* Set 0x324[5] = 1 */ pci_or_config32(dev, 0x324, 1 << 5); /* Set 0x330[7:0] = 0x40 */ pci_update_config32(dev, 0x330, ~0xff, 0x40); /* Set 0x33C[24:0] = 0x854c74 */ pci_update_config32(dev, 0x33c, 0xff000000, 0x00854c74); /* No IO-APIC, Disable EOI forwarding */ pci_or_config32(dev, 0xd4, 1 << 1); /* Check for a rootport ASPM override */ apmc = config->pcie_aspm[PCI_FUNC(dev->path.pci.devfn)]; /* Setup the override or get the real ASPM setting */ if (apmc) { pci_or_config32(dev, 0xd4, (apmc << 2) | (1 << 4)); } else { apmc = pci_read_config32(dev, 0x50) & 3; } /* If both L0s and L1 enabled then set root port 0xE8[1]=1 */ if (apmc == PCIE_ASPM_BOTH) pci_or_config32(dev, 0xe8, 1 << 1); } static void pci_init(struct device *dev) { u16 reg16; printk(BIOS_DEBUG, "Initializing PCH PCIe bridge.\n"); /* Enable Bus Master */ pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER); /* Set Cache Line Size to 0x10 */ // This has no effect but the OS might expect it pci_write_config8(dev, 0x0c, 0x10); pci_and_config16(dev, PCI_BRIDGE_CONTROL, ~PCI_BRIDGE_CTL_PARITY); /* Clear errors in status registers. FIXME: Do something? */ reg16 = pci_read_config16(dev, 0x06); //reg16 |= 0xf900; pci_write_config16(dev, 0x06, reg16); reg16 = pci_read_config16(dev, 0x1e); //reg16 |= 0xf900; pci_write_config16(dev, 0x1e, reg16); /* Enable expresscard hotplug events. */ if (pci_is_hotplugable(dev)) pci_or_config32(dev, 0xd8, 1 << 30); } static void pch_pcie_enable(struct device *dev) { /* Power Management init before enumeration */ pch_pcie_pm_early(dev); } static void pch_pciexp_scan_bridge(struct device *dev) { uint32_t cap = pci_find_capability(dev, PCI_CAP_ID_PCIE); if (CONFIG(PCIEXP_HOTPLUG) && pci_is_hotplugable(dev)) { pciexp_hotplug_scan_bridge(dev); } else { /* Normal PCIe Scan */ pciexp_scan_bridge(dev); } if ((pci_read_config16(dev, cap + PCI_EXP_SLTSTA) & PCI_EXP_SLTSTA_PDS) && !dev_is_active_bridge(dev)) printk(BIOS_WARNING, "%s: Has a slow downstream device. Enumeration failed.\n", dev_path(dev)); /* Late Power Management init after bridge device enumeration */ pch_pcie_pm_late(dev); } struct device_operations bd82x6x_pcie_rp_ops = { .read_resources = pci_bus_read_resources, .set_resources = pci_dev_set_resources, .enable_resources = pci_bus_enable_resources, .init = pci_init, .enable = pch_pcie_enable, .scan_bus = pch_pciexp_scan_bridge, .acpi_name = pch_pcie_acpi_name, .ops_pci = &pci_dev_ops_pci, };