| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.h> |
| #include <delay.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ops.h> |
| #include <string.h> |
| #include <timer.h> |
| |
| #include "chip.h" |
| #include "pch.h" |
| |
| int pch_silicon_revision(void) |
| { |
| static int pch_revision_id = -1; |
| |
| #ifdef __SIMPLE_DEVICE__ |
| pci_devfn_t dev = PCI_DEV(0, 0x1f, 0); |
| #else |
| struct device *dev = pcidev_on_root(0x1f, 0); |
| #endif |
| |
| if (pch_revision_id < 0) |
| pch_revision_id = pci_read_config8(dev, PCI_REVISION_ID); |
| return pch_revision_id; |
| } |
| |
| int pch_silicon_type(void) |
| { |
| static int pch_type = -1; |
| |
| #ifdef __SIMPLE_DEVICE__ |
| pci_devfn_t dev = PCI_DEV(0, 0x1f, 0); |
| #else |
| struct device *dev = pcidev_on_root(0x1f, 0); |
| #endif |
| |
| if (pch_type < 0) |
| pch_type = pci_read_config8(dev, PCI_DEVICE_ID + 1); |
| return pch_type; |
| } |
| |
| static int pch_silicon_supported(int type, int rev) |
| { |
| int cur_type = pch_silicon_type(); |
| int cur_rev = pch_silicon_revision(); |
| |
| switch (type) { |
| case PCH_TYPE_CPT: |
| /* CougarPoint minimum revision */ |
| if (cur_type == PCH_TYPE_CPT && cur_rev >= rev) |
| return 1; |
| /* PantherPoint any revision */ |
| if (cur_type == PCH_TYPE_PPT) |
| return 1; |
| break; |
| |
| case PCH_TYPE_PPT: |
| /* PantherPoint minimum revision */ |
| if (cur_type == PCH_TYPE_PPT && cur_rev >= rev) |
| return 1; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| #define IOBP_RETRY 1000 |
| static inline int iobp_poll(void) |
| { |
| unsigned int try = IOBP_RETRY; |
| u32 data; |
| |
| while (try--) { |
| data = RCBA32(IOBPS); |
| if ((data & 1) == 0) |
| return 1; |
| udelay(10); |
| } |
| |
| printk(BIOS_ERR, "IOBP timeout\n"); |
| return 0; |
| } |
| |
| void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue) |
| { |
| u32 data; |
| |
| /* Set the address */ |
| RCBA32(IOBPIRI) = address; |
| |
| /* READ OPCODE */ |
| if (pch_silicon_supported(PCH_TYPE_CPT, PCH_STEP_B0)) |
| RCBA32(IOBPS) = IOBPS_RW_BX; |
| else |
| RCBA32(IOBPS) = IOBPS_READ_AX; |
| if (!iobp_poll()) |
| return; |
| |
| /* Read IOBP data */ |
| data = RCBA32(IOBPD); |
| if (!iobp_poll()) |
| return; |
| |
| /* Check for successful transaction */ |
| if ((RCBA32(IOBPS) & 0x6) != 0) { |
| printk(BIOS_ERR, "IOBP read 0x%08x failed\n", address); |
| return; |
| } |
| |
| /* Update the data */ |
| data &= andvalue; |
| data |= orvalue; |
| |
| /* WRITE OPCODE */ |
| if (pch_silicon_supported(PCH_TYPE_CPT, PCH_STEP_B0)) |
| RCBA32(IOBPS) = IOBPS_RW_BX; |
| else |
| RCBA32(IOBPS) = IOBPS_WRITE_AX; |
| if (!iobp_poll()) |
| return; |
| |
| /* Write IOBP data */ |
| RCBA32(IOBPD) = data; |
| if (!iobp_poll()) |
| return; |
| } |
| |
| #ifndef __SIMPLE_DEVICE__ |
| /* Set bit in function disable register to hide this device */ |
| static void pch_hide_devfn(unsigned int devfn) |
| { |
| 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, |
| }; |
| #endif |