LXR linux/arch/x86/include/asm/pci

   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(fmt, ...) printk(fmt, ##__VA_ARGS__)
  11#else
  12#define DBG(fmt, ...)                           \
  13do {                                            \
  14        if (0)                                  \
  15                printk(fmt, ##__VA_ARGS__);     \
  16} while (0)
  17#endif
  18
  19#define PCI_PROBE_BIOS          0x0001
  20#define PCI_PROBE_CONF1         0x0002
  21#define PCI_PROBE_CONF2         0x0004
  22#define PCI_PROBE_MMCONF        0x0008
  23#define PCI_PROBE_MASK          0x000f
  24#define PCI_PROBE_NOEARLY       0x0010
  25
  26#define PCI_NO_CHECKS           0x0400
  27#define PCI_USE_PIRQ_MASK       0x0800
  28#define PCI_ASSIGN_ROMS         0x1000
  29#define PCI_BIOS_IRQ_SCAN       0x2000
  30#define PCI_ASSIGN_ALL_BUSSES   0x4000
  31#define PCI_CAN_SKIP_ISA_ALIGN  0x8000
  32#define PCI_USE__CRS            0x10000
  33#define PCI_CHECK_ENABLE_AMD_MMCONF     0x20000
  34#define PCI_HAS_IO_ECS          0x40000
  35#define PCI_NOASSIGN_ROMS       0x80000
  36#define PCI_ROOT_NO_CRS         0x100000
  37#define PCI_NOASSIGN_BARS       0x200000
  38
  39extern unsigned int pci_probe;
  40extern unsigned long pirq_table_addr;
  41
  42enum pci_bf_sort_state {
  43        pci_bf_sort_default,
  44        pci_force_nobf,
  45        pci_force_bf,
  46        pci_dmi_bf,
  47};
  48
  49/* pci-i386.c */
  50
  51void pcibios_resource_survey(void);
  52void pcibios_set_cache_line_size(void);
  53
  54/* pci-pc.c */
  55
  56extern int pcibios_last_bus;
  57extern struct pci_ops pci_root_ops;
  58
  59void pcibios_scan_specific_bus(int busn);
  60
  61/* pci-irq.c */
  62
  63struct irq_info {
  64        u8 bus, devfn;                  /* Bus, device and function */
  65        struct {
  66                u8 link;                /* IRQ line ID, chipset dependent,
  67                                           0 = not routed */
  68                u16 bitmap;             /* Available IRQs */
  69        } __attribute__((packed)) irq[4];
  70        u8 slot;                        /* Slot number, 0=onboard */
  71        u8 rfu;
  72} __attribute__((packed));
  73
  74struct irq_routing_table {
  75        u32 signature;                  /* PIRQ_SIGNATURE should be here */
  76        u16 version;                    /* PIRQ_VERSION */
  77        u16 size;                       /* Table size in bytes */
  78        u8 rtr_bus, rtr_devfn;          /* Where the interrupt router lies */
  79        u16 exclusive_irqs;             /* IRQs devoted exclusively to
  80                                           PCI usage */
  81        u16 rtr_vendor, rtr_device;     /* Vendor and device ID of
  82                                           interrupt router */
  83        u32 miniport_data;              /* Crap */
  84        u8 rfu[11];
  85        u8 checksum;                    /* Modulo 256 checksum must give 0 */
  86        struct irq_info slots[0];
  87} __attribute__((packed));
  88
  89extern unsigned int pcibios_irq_mask;
  90
  91extern raw_spinlock_t pci_config_lock;
  92
  93extern int (*pcibios_enable_irq)(struct pci_dev *dev);
  94extern void (*pcibios_disable_irq)(struct pci_dev *dev);
  95
  96struct pci_raw_ops {
  97        int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
  98                                                int reg, int len, u32 *val);
  99        int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
 100                                                int reg, int len, u32 val);
 101};
 102
 103extern const struct pci_raw_ops *raw_pci_ops;
 104extern const struct pci_raw_ops *raw_pci_ext_ops;
 105
 106extern const struct pci_raw_ops pci_mmcfg;
 107extern const struct pci_raw_ops pci_direct_conf1;
 108extern bool port_cf9_safe;
 109
 110/* arch_initcall level */
 111extern int pci_direct_probe(void);
 112extern void pci_direct_init(int type);
 113extern void pci_pcbios_init(void);
 114extern void __init dmi_check_pciprobe(void);
 115extern void __init dmi_check_skip_isa_align(void);
 116
 117/* some common used subsys_initcalls */
 118extern int __init pci_acpi_init(void);
 119extern void __init pcibios_irq_init(void);
 120extern int __init pcibios_init(void);
 121extern int pci_legacy_init(void);
 122extern void pcibios_fixup_irqs(void);
 123
 124/* pci-mmconfig.c */
 125
 126/* "PCI MMCONFIG %04x [bus %02x-%02x]" */
 127#define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
 128
 129struct pci_mmcfg_region {
 130        struct list_head list;
 131        struct resource res;
 132        u64 address;
 133        char __iomem *virt;
 134        u16 segment;
 135        u8 start_bus;
 136        u8 end_bus;
 137        char name[PCI_MMCFG_RESOURCE_NAME_LEN];
 138};
 139
 140extern int __init pci_mmcfg_arch_init(void);
 141extern void __init pci_mmcfg_arch_free(void);
 142extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
 143extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
 144extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
 145                               phys_addr_t addr);
 146extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
 147extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
 148
 149extern struct list_head pci_mmcfg_list;
 150
 151#define PCI_MMCFG_BUS_OFFSET(bus)      ((bus) << 20)
 152
 153/*
 154 * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
 155 * on their northbrige except through the * %eax register. As such, you MUST
 156 * NOT use normal IOMEM accesses, you need to only use the magic mmio-config
 157 * accessor functions.
 158 * In fact just use pci_config_*, nothing else please.
 159 */
 160static inline unsigned char mmio_config_readb(void __iomem *pos)
 161{
 162        u8 val;
 163        asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
 164        return val;
 165}
 166
 167static inline unsigned short mmio_config_readw(void __iomem *pos)
 168{
 169        u16 val;
 170        asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
 171        return val;
 172}
 173
 174static inline unsigned int mmio_config_readl(void __iomem *pos)
 175{
 176        u32 val;
 177        asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
 178        return val;
 179}
 180
 181static inline void mmio_config_writeb(void __iomem *pos, u8 val)
 182{
 183        asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory");
 184}
 185
 186static inline void mmio_config_writew(void __iomem *pos, u16 val)
 187{
 188        asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory");
 189}
 190
 191static inline void mmio_config_writel(void __iomem *pos, u32 val)
 192{
 193        asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory");
 194}
 195
 196#ifdef CONFIG_PCI
 197# ifdef CONFIG_ACPI
 198#  define x86_default_pci_init          pci_acpi_init
 199# else
 200#  define x86_default_pci_init          pci_legacy_init
 201# endif
 202# define x86_default_pci_init_irq       pcibios_irq_init
 203# define x86_default_pci_fixup_irqs     pcibios_fixup_irqs
 204#else
 205# define x86_default_pci_init           NULL
 206# define x86_default_pci_init_irq       NULL
 207# define x86_default_pci_fixup_irqs     NULL
 208#endif
 209