/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include "amd_pci_util.h" #include #include "amd_pci_int_defs.h" #include "amd_pci_int_types.h" const struct pirq_struct * pirq_data_ptr = NULL; u32 pirq_data_size = 0; const u8 *intr_data_ptr = NULL; const u8 *picr_data_ptr = NULL; /* * Read the FCH PCI_INTR registers 0xC00/0xC01 at a * given index and a given PIC (0) or IOAPIC (1) mode */ u8 read_pci_int_idx(u8 index, int mode) { outb((mode << 7) | index, PCI_INTR_INDEX); return inb(PCI_INTR_DATA); } /* * Write a value to the FCH PCI_INTR registers 0xC00/0xC01 * at a given index and PIC (0) or IOAPIC (1) mode */ void write_pci_int_idx(u8 index, int mode, u8 data) { outb((mode << 7) | index, PCI_INTR_INDEX); outb(data, PCI_INTR_DATA); } /* * Write the FCH PCI_INTR registers 0xC00/0xC01 with values * given in global variables intr_data and picr_data. * These variables are defined in mainboard.c */ void write_pci_int_table (void) { u8 byte; if (picr_data_ptr == NULL || intr_data_ptr == NULL){ printk(BIOS_ERR, "Warning: Can't write PCI_INTR 0xC00/0xC01 registers because\n" "'mainboard_picr_data' or 'mainboard_intr_data' tables are NULL\n"); return; } /* PIC IRQ routine */ printk(BIOS_DEBUG, "PCI_INTR tables: Writing registers C00/C01 for PIC mode PCI IRQ routing:\n" "\tPCI_INTR_INDEX\t\tPCI_INTR_DATA\n"); for (byte = 0; byte < FCH_INT_TABLE_SIZE; byte++) { if (intr_types[byte]) { write_pci_int_idx(byte, 0, (u8) picr_data_ptr[byte]); printk(BIOS_DEBUG, "\t0x%02X %s\t: 0x%02X\n", byte, intr_types[byte], read_pci_int_idx(byte, 0)); } } /* APIC IRQ routine */ printk(BIOS_DEBUG, "PCI_INTR tables: Writing registers C00/C01 for APIC mode PCI IRQ routing:\n" "\tPCI_INTR_INDEX\t\tPCI_INTR_DATA\n"); for (byte = 0; byte < FCH_INT_TABLE_SIZE; byte++) { if (intr_types[byte]) { write_pci_int_idx(byte, 1, (u8) intr_data_ptr[byte]); printk(BIOS_DEBUG, "\t0x%02X %s\t: 0x%02X\n", byte, intr_types[byte], read_pci_int_idx(byte, 1)); } } } /* * Function to write the PCI config space Interrupt * registers based on the values given in PCI_INTR * table at I/O port 0xC00/0xC01 */ void write_pci_cfg_irqs(void) { struct device *dev = NULL; /* Our current device to route IRQs to */ struct device *target_dev = NULL; /* The bridge that a device may be connected to */ u16 int_pin = 0; /* Value of the INT_PIN register 0x3D */ u16 target_pin = 0; /* Pin we will search our tables for */ u16 int_line = 0; /* IRQ number read from PCI_INTR table and programmed to INT_LINE reg 0x3C */ u16 pci_intr_idx = 0; /* Index into PCI_INTR table, 0xC00/0xC01 */ u16 devfn = 0; /* A PCI Device and Function number */ u8 bridged_device = 0; /* This device is on a PCI bridge */ u32 i = 0; if (pirq_data_ptr == NULL) { printk(BIOS_WARNING, "Warning: Can't write PCI IRQ assignments because" " 'mainboard_pirq_data' structure does not exist\n"); return; } /* Populate the PCI cfg space header with the IRQ assignment */ printk(BIOS_DEBUG, "PCI_CFG IRQ: Write PCI config space IRQ assignments\n"); for (dev = all_devices; dev; dev = dev->next) { /* * Step 1: Get the INT_PIN and device structure to look for in the * PCI_INTR table pirq_data */ target_dev = NULL; target_pin = get_pci_irq_pins(dev, &target_dev); if (target_dev == NULL) continue; if (target_pin < 1) continue; /* Get the original INT_PIN for record keeping */ int_pin = pci_read_config8(dev, PCI_INTERRUPT_PIN); if (int_pin < 1 || int_pin > 4) continue; /* Device has invalid INT_PIN so skip it */ devfn = target_dev->path.pci.devfn; /* * Step 2: Use the INT_PIN and DevFn number to find the PCI_INTR * register (0xC00) index for this device */ pci_intr_idx = 0xBAD; /* Will check to make sure it changed */ for (i = 0; i < pirq_data_size; i++) { if (pirq_data_ptr[i].devfn != devfn) continue; /* PIN_A is index 0 in pirq_data array but 1 in PCI cfg reg */ pci_intr_idx = pirq_data_ptr[i].PIN[target_pin - 1]; printk(BIOS_SPEW, "\tFound this device in pirq_data table entry %d\n", i); break; } /* * Step 3: Make sure we got a valid index and use it to get * the IRQ number from the PCI_INTR register table */ if (pci_intr_idx == 0xBAD) { /* Not on a bridge or in pirq_data table, skip it */ printk(BIOS_SPEW, "PCI Devfn (0x%x) not found in pirq_data table\n", devfn); continue; } else if (pci_intr_idx == 0x1F) { /* Index found is not defined */ printk(BIOS_SPEW, "Got index 0x1F (Not Connected), perhaps this device was defined wrong?\n"); continue; } else if (pci_intr_idx >= FCH_INT_TABLE_SIZE) { /* Index out of bounds */ printk(BIOS_ERR, "%s: got 0xC00/0xC01 table index 0x%x, max is 0x%x\n", __func__, pci_intr_idx, FCH_INT_TABLE_SIZE); continue; } /* Find the value to program into the INT_LINE register from the PCI_INTR registers */ int_line = read_pci_int_idx(pci_intr_idx, 0); if (int_line == PIRQ_NC) { /* The IRQ found is disabled */ printk(BIOS_SPEW, "Got IRQ 0x1F (disabled), perhaps this device was defined wrong?\n"); continue; } /* * Step 4: Program the INT_LINE register in this device's * PCI config space with the IRQ number we found in step 3 * and make it Level Triggered */ pci_write_config8(dev, PCI_INTERRUPT_LINE, int_line); /* Set this IRQ to level triggered since it is used by a PCI device */ i8259_configure_irq_trigger(int_line, IRQ_LEVEL_TRIGGERED); /* * Step 5: Print out debug info and move on to next device */ printk(BIOS_SPEW, "\tOrig INT_PIN\t: %d (%s)\n", int_pin, pin_to_str(int_pin)); if (bridged_device) printk(BIOS_SPEW, "\tSwizzled to\t: %d (%s)\n", target_pin, pin_to_str(target_pin)); printk(BIOS_SPEW, "\tPCI_INTR idx\t: 0x%02x (%s)\n" "\tINT_LINE\t: 0x%X (IRQ %d)\n", pci_intr_idx, intr_types[pci_intr_idx], int_line, int_line); } /* for (dev = all_devices) */ printk(BIOS_DEBUG, "PCI_CFG IRQ: Finished writing PCI config space IRQ assignments\n"); }