1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Low-Level PCI Access for i386 machines. 4 * 5 * (c) 1999 Martin Mares <mj@ucw.cz> 6 */ 7 8 #include <linux/errno.h> 9 #include <linux/init.h> 10 #include <linux/ioport.h> 11 #include <linux/spinlock.h> 12 13 #undef DEBUG 14 15 #ifdef DEBUG 16 #define DBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 17 #else 18 #define DBG(fmt, ...) \ 19 do { \ 20 if (0) \ 21 printk(fmt, ##__VA_ARGS__); \ 22 } while (0) 23 #endif 24 25 #define PCI_PROBE_BIOS 0x0001 26 #define PCI_PROBE_CONF1 0x0002 27 #define PCI_PROBE_CONF2 0x0004 28 #define PCI_PROBE_MMCONF 0x0008 29 #define PCI_PROBE_MASK 0x000f 30 #define PCI_PROBE_NOEARLY 0x0010 31 32 #define PCI_NO_CHECKS 0x0400 33 #define PCI_USE_PIRQ_MASK 0x0800 34 #define PCI_ASSIGN_ROMS 0x1000 35 #define PCI_BIOS_IRQ_SCAN 0x2000 36 #define PCI_ASSIGN_ALL_BUSSES 0x4000 37 #define PCI_CAN_SKIP_ISA_ALIGN 0x8000 38 #define PCI_USE__CRS 0x10000 39 #define PCI_CHECK_ENABLE_AMD_MMCONF 0x20000 40 #define PCI_HAS_IO_ECS 0x40000 41 #define PCI_NOASSIGN_ROMS 0x80000 42 #define PCI_ROOT_NO_CRS 0x100000 43 #define PCI_NOASSIGN_BARS 0x200000 44 #define PCI_BIG_ROOT_WINDOW 0x400000 45 #define PCI_USE_E820 0x800000 46 #define PCI_NO_E820 0x1000000 47 48 extern unsigned int pci_probe; 49 extern unsigned long pirq_table_addr; 50 51 enum pci_bf_sort_state { 52 pci_bf_sort_default, 53 pci_force_nobf, 54 pci_force_bf, 55 pci_dmi_bf, 56 }; 57 58 /* pci-i386.c */ 59 60 void pcibios_resource_survey(void); 61 void pcibios_set_cache_line_size(void); 62 63 /* pci-pc.c */ 64 65 extern int pcibios_last_bus; 66 extern struct pci_ops pci_root_ops; 67 68 void pcibios_scan_specific_bus(int busn); 69 70 /* pci-irq.c */ 71 72 struct pci_dev; 73 74 struct irq_info { 75 u8 bus, devfn; /* Bus, device and function */ 76 struct { 77 u8 link; /* IRQ line ID, chipset dependent, 78 0 = not routed */ 79 u16 bitmap; /* Available IRQs */ 80 } __attribute__((packed)) irq[4]; 81 u8 slot; /* Slot number, 0=onboard */ 82 u8 rfu; 83 } __attribute__((packed)); 84 85 struct irq_routing_table { 86 u32 signature; /* PIRQ_SIGNATURE should be here */ 87 u16 version; /* PIRQ_VERSION */ 88 u16 size; /* Table size in bytes */ 89 u8 rtr_bus, rtr_devfn; /* Where the interrupt router lies */ 90 u16 exclusive_irqs; /* IRQs devoted exclusively to 91 PCI usage */ 92 u16 rtr_vendor, rtr_device; /* Vendor and device ID of 93 interrupt router */ 94 u32 miniport_data; /* Crap */ 95 u8 rfu[11]; 96 u8 checksum; /* Modulo 256 checksum must give 0 */ 97 struct irq_info slots[]; 98 } __attribute__((packed)); 99 100 struct irt_routing_table { 101 u32 signature; /* IRT_SIGNATURE should be here */ 102 u8 size; /* Number of entries provided */ 103 u8 used; /* Number of entries actually used */ 104 u16 exclusive_irqs; /* IRQs devoted exclusively to 105 PCI usage */ 106 struct irq_info slots[]; 107 } __attribute__((packed)); 108 109 extern unsigned int pcibios_irq_mask; 110 111 extern raw_spinlock_t pci_config_lock; 112 113 extern int (*pcibios_enable_irq)(struct pci_dev *dev); 114 extern void (*pcibios_disable_irq)(struct pci_dev *dev); 115 116 extern bool mp_should_keep_irq(struct device *dev); 117 118 struct pci_raw_ops { 119 int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn, 120 int reg, int len, u32 *val); 121 int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn, 122 int reg, int len, u32 val); 123 }; 124 125 extern const struct pci_raw_ops *raw_pci_ops; 126 extern const struct pci_raw_ops *raw_pci_ext_ops; 127 128 extern const struct pci_raw_ops pci_mmcfg; 129 extern const struct pci_raw_ops pci_direct_conf1; 130 extern bool port_cf9_safe; 131 132 /* arch_initcall level */ 133 #ifdef CONFIG_PCI_DIRECT 134 extern int pci_direct_probe(void); 135 extern void pci_direct_init(int type); 136 #else 137 static inline int pci_direct_probe(void) { return -1; } 138 static inline void pci_direct_init(int type) { } 139 #endif 140 141 #ifdef CONFIG_PCI_BIOS 142 extern void pci_pcbios_init(void); 143 #else 144 static inline void pci_pcbios_init(void) { } 145 #endif 146 147 extern void __init dmi_check_pciprobe(void); 148 extern void __init dmi_check_skip_isa_align(void); 149 150 /* some common used subsys_initcalls */ 151 #ifdef CONFIG_PCI 152 extern int __init pci_acpi_init(void); 153 #else 154 static inline int __init pci_acpi_init(void) 155 { 156 return -EINVAL; 157 } 158 #endif 159 extern void __init pcibios_irq_init(void); 160 extern int __init pcibios_init(void); 161 extern int pci_legacy_init(void); 162 extern void pcibios_fixup_irqs(void); 163 164 /* pci-mmconfig.c */ 165 166 /* "PCI MMCONFIG %04x [bus %02x-%02x]" */ 167 #define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2) 168 169 struct pci_mmcfg_region { 170 struct list_head list; 171 struct resource res; 172 u64 address; 173 char __iomem *virt; 174 u16 segment; 175 u8 start_bus; 176 u8 end_bus; 177 char name[PCI_MMCFG_RESOURCE_NAME_LEN]; 178 }; 179 180 extern int __init pci_mmcfg_arch_init(void); 181 extern void __init pci_mmcfg_arch_free(void); 182 extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg); 183 extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg); 184 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end, 185 phys_addr_t addr); 186 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end); 187 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus); 188 extern struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start, 189 int end, u64 addr); 190 191 extern struct list_head pci_mmcfg_list; 192 193 #define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20) 194 195 /* 196 * On AMD Fam10h CPUs, all PCI MMIO configuration space accesses must use 197 * %eax. No other source or target registers may be used. The following 198 * mmio_config_* accessors enforce this. See "BIOS and Kernel Developer's 199 * Guide (BKDG) For AMD Family 10h Processors", rev. 3.48, sec 2.11.1, 200 * "MMIO Configuration Coding Requirements". 201 */ 202 static inline unsigned char mmio_config_readb(void __iomem *pos) 203 { 204 u8 val; 205 asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos)); 206 return val; 207 } 208 209 static inline unsigned short mmio_config_readw(void __iomem *pos) 210 { 211 u16 val; 212 asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos)); 213 return val; 214 } 215 216 static inline unsigned int mmio_config_readl(void __iomem *pos) 217 { 218 u32 val; 219 asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos)); 220 return val; 221 } 222 223 static inline void mmio_config_writeb(void __iomem *pos, u8 val) 224 { 225 asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory"); 226 } 227 228 static inline void mmio_config_writew(void __iomem *pos, u16 val) 229 { 230 asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory"); 231 } 232 233 static inline void mmio_config_writel(void __iomem *pos, u32 val) 234 { 235 asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory"); 236 } 237 238 #ifdef CONFIG_PCI 239 # ifdef CONFIG_ACPI 240 # define x86_default_pci_init pci_acpi_init 241 # else 242 # define x86_default_pci_init pci_legacy_init 243 # endif 244 # define x86_default_pci_init_irq pcibios_irq_init 245 # define x86_default_pci_fixup_irqs pcibios_fixup_irqs 246 #else 247 # define x86_default_pci_init NULL 248 # define x86_default_pci_init_irq NULL 249 # define x86_default_pci_fixup_irqs NULL 250 #endif 251 252 #if defined(CONFIG_PCI) && defined(CONFIG_ACPI) 253 extern bool pci_use_e820; 254 #else 255 #define pci_use_e820 false 256 #endif 257