1*83d290c5STom Rini /* SPDX-License-Identifier: GPL-2.0+ */ 2b5b6b019SBin Meng /* 3b5b6b019SBin Meng * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> 4b5b6b019SBin Meng * 5b5b6b019SBin Meng * Ported from coreboot src/arch/x86/include/arch/pirq_routing.h 6b5b6b019SBin Meng */ 7b5b6b019SBin Meng 8b5b6b019SBin Meng #ifndef _PIRQ_ROUTING_H_ 9b5b6b019SBin Meng #define _PIRQ_ROUTING_H_ 10b5b6b019SBin Meng 11b5b6b019SBin Meng /* 12b5b6b019SBin Meng * This is the maximum number on interrupt entries that a PCI device may have. 13b5b6b019SBin Meng * This is NOT the number of slots or devices in the system 14b5b6b019SBin Meng * This is NOT the number of entries in the PIRQ table 15b5b6b019SBin Meng * 16b5b6b019SBin Meng * This tells us that in the PIRQ table, we are going to have 4 link-bitmap 17b5b6b019SBin Meng * entries per PCI device which is fixed at 4: INTA, INTB, INTC, and INTD. 18b5b6b019SBin Meng * 19b5b6b019SBin Meng * CAUTION: If you change this, PIRQ routing will not work correctly. 20b5b6b019SBin Meng */ 21b5b6b019SBin Meng #define MAX_INTX_ENTRIES 4 22b5b6b019SBin Meng 23b5b6b019SBin Meng #define PIRQ_SIGNATURE \ 24b5b6b019SBin Meng (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24)) 25b5b6b019SBin Meng #define PIRQ_VERSION 0x0100 26b5b6b019SBin Meng 27b5b6b019SBin Meng struct __packed irq_info { 28b5b6b019SBin Meng u8 bus; /* Bus number */ 29b5b6b019SBin Meng u8 devfn; /* Device and function number */ 30b5b6b019SBin Meng struct __packed { 31b5b6b019SBin Meng u8 link; /* IRQ line ID, 0=not routed */ 32b5b6b019SBin Meng u16 bitmap; /* Available IRQs */ 33b5b6b019SBin Meng } irq[MAX_INTX_ENTRIES]; 34b5b6b019SBin Meng u8 slot; /* Slot number, 0=onboard */ 35b5b6b019SBin Meng u8 rfu; 36b5b6b019SBin Meng }; 37b5b6b019SBin Meng 38b5b6b019SBin Meng struct __packed irq_routing_table { 39b5b6b019SBin Meng u32 signature; /* PIRQ_SIGNATURE */ 40b5b6b019SBin Meng u16 version; /* PIRQ_VERSION */ 41b5b6b019SBin Meng u16 size; /* Table size in bytes */ 42b5b6b019SBin Meng u8 rtr_bus; /* busno of the interrupt router */ 43b5b6b019SBin Meng u8 rtr_devfn; /* devfn of the interrupt router */ 44b5b6b019SBin Meng u16 exclusive_irqs; /* IRQs devoted exclusively to PCI usage */ 45b5b6b019SBin Meng u16 rtr_vendor; /* Vendor ID of the interrupt router */ 46b5b6b019SBin Meng u16 rtr_device; /* Device ID of the interrupt router */ 47b5b6b019SBin Meng u32 miniport_data; 48b5b6b019SBin Meng u8 rfu[11]; 49b5b6b019SBin Meng u8 checksum; /* Modulo 256 checksum must give zero */ 50b5b6b019SBin Meng struct irq_info slots[CONFIG_IRQ_SLOT_COUNT]; 51b5b6b019SBin Meng }; 52b5b6b019SBin Meng 53b5b6b019SBin Meng /** 54b5b6b019SBin Meng * get_irq_slot_count() - Get the number of entries in the irq_info table 55b5b6b019SBin Meng * 56b5b6b019SBin Meng * This calculates the number of entries for the irq_info table. 57b5b6b019SBin Meng * 58b5b6b019SBin Meng * @rt: pointer to the base address of the struct irq_info 59b5b6b019SBin Meng * @return: number of entries 60b5b6b019SBin Meng */ 61b5b6b019SBin Meng static inline int get_irq_slot_count(struct irq_routing_table *rt) 62b5b6b019SBin Meng { 63b5b6b019SBin Meng return (rt->size - 32) / sizeof(struct irq_info); 64b5b6b019SBin Meng } 65b5b6b019SBin Meng 66b5b6b019SBin Meng /** 67b5b6b019SBin Meng * pirq_check_irq_routed() - Check whether an IRQ is routed to 8259 PIC 68b5b6b019SBin Meng * 69b5b6b019SBin Meng * This function checks whether an IRQ is routed to 8259 PIC for a given link. 70b5b6b019SBin Meng * 71b5b6b019SBin Meng * Note: this function should be provided by the platform codes, as the 72b5b6b019SBin Meng * implementation of interrupt router may be different. 73b5b6b019SBin Meng * 74b46c2088SBin Meng * @dev: irq router's udevice 75b5b6b019SBin Meng * @link: link number which represents a PIRQ 76b5b6b019SBin Meng * @irq: the 8259 IRQ number 77b5b6b019SBin Meng * @return: true if the irq is already routed to 8259 for a given link, 78b5b6b019SBin Meng * false elsewise 79b5b6b019SBin Meng */ 80b46c2088SBin Meng bool pirq_check_irq_routed(struct udevice *dev, int link, u8 irq); 81b5b6b019SBin Meng 82b5b6b019SBin Meng /** 83b5b6b019SBin Meng * pirq_translate_link() - Translate a link value 84b5b6b019SBin Meng * 85b5b6b019SBin Meng * This function translates a platform-specific link value to a link number. 86b5b6b019SBin Meng * On Intel platforms, the link value is normally a offset into the PCI 87b5b6b019SBin Meng * configuration space into the legacy bridge. 88b5b6b019SBin Meng * 89b5b6b019SBin Meng * Note: this function should be provided by the platform codes, as the 90b5b6b019SBin Meng * implementation of interrupt router may be different. 91b5b6b019SBin Meng * 92b46c2088SBin Meng * @dev: irq router's udevice 93b5b6b019SBin Meng * @link: platform-specific link value 94b5b6b019SBin Meng * @return: link number which represents a PIRQ 95b5b6b019SBin Meng */ 96b46c2088SBin Meng int pirq_translate_link(struct udevice *dev, int link); 97b5b6b019SBin Meng 98b5b6b019SBin Meng /** 99b5b6b019SBin Meng * pirq_assign_irq() - Assign an IRQ to a PIRQ link 100b5b6b019SBin Meng * 101b5b6b019SBin Meng * This function assigns the IRQ to a PIRQ link so that the PIRQ is routed to 102b5b6b019SBin Meng * the 8259 PIC. 103b5b6b019SBin Meng * 104b5b6b019SBin Meng * Note: this function should be provided by the platform codes, as the 105b5b6b019SBin Meng * implementation of interrupt router may be different. 106b5b6b019SBin Meng * 107b46c2088SBin Meng * @dev: irq router's udevice 108b5b6b019SBin Meng * @link: link number which represents a PIRQ 109b5b6b019SBin Meng * @irq: IRQ to which the PIRQ is routed 110b5b6b019SBin Meng */ 111b46c2088SBin Meng void pirq_assign_irq(struct udevice *dev, int link, u8 irq); 112b5b6b019SBin Meng 113b5b6b019SBin Meng /** 114b5b6b019SBin Meng * pirq_route_irqs() - Route PIRQs to 8259 PIC 115b5b6b019SBin Meng * 116b5b6b019SBin Meng * This function configures all PCI devices' interrupt pins and maps them to 117b5b6b019SBin Meng * PIRQs and finally 8259 PIC. The routed irq number is written to interrupt 118b5b6b019SBin Meng * line register in the configuration space of the PCI device for OS to use. 119b5b6b019SBin Meng * The configuration source is taken from a struct irq_info table, the format 120b5b6b019SBin Meng * of which is defined in PIRQ routing table spec and PCI BIOS spec. 121b5b6b019SBin Meng * 122b46c2088SBin Meng * @dev: irq router's udevice 123b5b6b019SBin Meng * @irq: pointer to the base address of the struct irq_info 124b5b6b019SBin Meng * @num: number of entries in the struct irq_info 125b5b6b019SBin Meng */ 126b46c2088SBin Meng void pirq_route_irqs(struct udevice *dev, struct irq_info *irq, int num); 127b5b6b019SBin Meng 128b5b6b019SBin Meng /** 129b5b6b019SBin Meng * copy_pirq_routing_table() - Copy a PIRQ routing table 130b5b6b019SBin Meng * 131b5b6b019SBin Meng * This helper function copies the given PIRQ routing table to a given address. 132b5b6b019SBin Meng * Before copying, it does several sanity tests against the PIRQ routing table. 133b5b6b019SBin Meng * It also fixes up the table checksum and align the given address to a 16 byte 134b5b6b019SBin Meng * boundary to meet the PIRQ routing table spec requirements. 135b5b6b019SBin Meng * 136b5b6b019SBin Meng * @addr: address to store the copied PIRQ routing table 137b5b6b019SBin Meng * @rt: pointer to the PIRQ routing table to copy from 138b5b6b019SBin Meng * @return: end address of the copied PIRQ routing table 139b5b6b019SBin Meng */ 140b5b6b019SBin Meng u32 copy_pirq_routing_table(u32 addr, struct irq_routing_table *rt); 141b5b6b019SBin Meng 142b5b6b019SBin Meng #endif /* _PIRQ_ROUTING_H_ */ 143