1 /* 2 * Low-Level PCI Access for i386 machines. 3 * 4 * (c) 1999 Martin Mares <mj@ucw.cz> 5 */ 6 7 #undef DEBUG 8 9 #ifdef DEBUG 10 #define DBG(x...) printk(x) 11 #else 12 #define DBG(x...) 13 #endif 14 15 #define PCI_PROBE_BIOS 0x0001 16 #define PCI_PROBE_CONF1 0x0002 17 #define PCI_PROBE_CONF2 0x0004 18 #define PCI_PROBE_MMCONF 0x0008 19 #define PCI_PROBE_MASK 0x000f 20 #define PCI_PROBE_NOEARLY 0x0010 21 22 #define PCI_NO_CHECKS 0x0400 23 #define PCI_USE_PIRQ_MASK 0x0800 24 #define PCI_ASSIGN_ROMS 0x1000 25 #define PCI_BIOS_IRQ_SCAN 0x2000 26 #define PCI_ASSIGN_ALL_BUSSES 0x4000 27 #define PCI_CAN_SKIP_ISA_ALIGN 0x8000 28 #define PCI_USE__CRS 0x10000 29 #define PCI_CHECK_ENABLE_AMD_MMCONF 0x20000 30 #define PCI_HAS_IO_ECS 0x40000 31 #define PCI_NOASSIGN_ROMS 0x80000 32 33 extern unsigned int pci_probe; 34 extern unsigned long pirq_table_addr; 35 36 enum pci_bf_sort_state { 37 pci_bf_sort_default, 38 pci_force_nobf, 39 pci_force_bf, 40 pci_dmi_bf, 41 }; 42 43 /* pci-i386.c */ 44 45 extern unsigned int pcibios_max_latency; 46 47 void pcibios_resource_survey(void); 48 49 /* pci-pc.c */ 50 51 extern int pcibios_last_bus; 52 extern struct pci_bus *pci_root_bus; 53 extern struct pci_ops pci_root_ops; 54 55 /* pci-irq.c */ 56 57 struct irq_info { 58 u8 bus, devfn; /* Bus, device and function */ 59 struct { 60 u8 link; /* IRQ line ID, chipset dependent, 61 0 = not routed */ 62 u16 bitmap; /* Available IRQs */ 63 } __attribute__((packed)) irq[4]; 64 u8 slot; /* Slot number, 0=onboard */ 65 u8 rfu; 66 } __attribute__((packed)); 67 68 struct irq_routing_table { 69 u32 signature; /* PIRQ_SIGNATURE should be here */ 70 u16 version; /* PIRQ_VERSION */ 71 u16 size; /* Table size in bytes */ 72 u8 rtr_bus, rtr_devfn; /* Where the interrupt router lies */ 73 u16 exclusive_irqs; /* IRQs devoted exclusively to 74 PCI usage */ 75 u16 rtr_vendor, rtr_device; /* Vendor and device ID of 76 interrupt router */ 77 u32 miniport_data; /* Crap */ 78 u8 rfu[11]; 79 u8 checksum; /* Modulo 256 checksum must give 0 */ 80 struct irq_info slots[0]; 81 } __attribute__((packed)); 82 83 extern unsigned int pcibios_irq_mask; 84 85 extern int pcibios_scanned; 86 extern spinlock_t pci_config_lock; 87 88 extern int (*pcibios_enable_irq)(struct pci_dev *dev); 89 extern void (*pcibios_disable_irq)(struct pci_dev *dev); 90 91 struct pci_raw_ops { 92 int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn, 93 int reg, int len, u32 *val); 94 int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn, 95 int reg, int len, u32 val); 96 }; 97 98 extern struct pci_raw_ops *raw_pci_ops; 99 extern struct pci_raw_ops *raw_pci_ext_ops; 100 101 extern struct pci_raw_ops pci_direct_conf1; 102 extern bool port_cf9_safe; 103 104 /* arch_initcall level */ 105 extern int pci_direct_probe(void); 106 extern void pci_direct_init(int type); 107 extern void pci_pcbios_init(void); 108 extern int pci_olpc_init(void); 109 extern void __init dmi_check_pciprobe(void); 110 extern void __init dmi_check_skip_isa_align(void); 111 112 /* some common used subsys_initcalls */ 113 extern int __init pci_acpi_init(void); 114 extern int __init pcibios_irq_init(void); 115 extern int __init pci_visws_init(void); 116 extern int __init pci_numaq_init(void); 117 extern int __init pcibios_init(void); 118 119 /* pci-mmconfig.c */ 120 121 /* "PCI MMCONFIG %04x [bus %02x-%02x]" */ 122 #define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2) 123 124 struct pci_mmcfg_region { 125 struct list_head list; 126 struct resource res; 127 u64 address; 128 char __iomem *virt; 129 u16 segment; 130 u8 start_bus; 131 u8 end_bus; 132 char name[PCI_MMCFG_RESOURCE_NAME_LEN]; 133 }; 134 135 extern int __init pci_mmcfg_arch_init(void); 136 extern void __init pci_mmcfg_arch_free(void); 137 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus); 138 139 extern struct list_head pci_mmcfg_list; 140 141 #define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20) 142 143 /* 144 * AMD Fam10h CPUs are buggy, and cannot access MMIO config space 145 * on their northbrige except through the * %eax register. As such, you MUST 146 * NOT use normal IOMEM accesses, you need to only use the magic mmio-config 147 * accessor functions. 148 * In fact just use pci_config_*, nothing else please. 149 */ 150 static inline unsigned char mmio_config_readb(void __iomem *pos) 151 { 152 u8 val; 153 asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos)); 154 return val; 155 } 156 157 static inline unsigned short mmio_config_readw(void __iomem *pos) 158 { 159 u16 val; 160 asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos)); 161 return val; 162 } 163 164 static inline unsigned int mmio_config_readl(void __iomem *pos) 165 { 166 u32 val; 167 asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos)); 168 return val; 169 } 170 171 static inline void mmio_config_writeb(void __iomem *pos, u8 val) 172 { 173 asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory"); 174 } 175 176 static inline void mmio_config_writew(void __iomem *pos, u16 val) 177 { 178 asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory"); 179 } 180 181 static inline void mmio_config_writel(void __iomem *pos, u32 val) 182 { 183 asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory"); 184 } 185