arch/i386/pci/pci.h

   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_SORT             0x0100
  23 #define PCI_BIOS_SORT           0x0200
  24 #define PCI_NO_CHECKS           0x0400
  25 #define PCI_USE_PIRQ_MASK       0x0800
  26 #define PCI_ASSIGN_ROMS         0x1000
  27 #define PCI_BIOS_IRQ_SCAN       0x2000
  28 #define PCI_ASSIGN_ALL_BUSSES   0x4000
  29
  30 extern unsigned int pci_probe;
  31 extern unsigned long pirq_table_addr;
  32
  33 enum pci_bf_sort_state {
  34         pci_bf_sort_default,
  35         pci_force_nobf,
  36         pci_force_bf,
  37         pci_dmi_bf,
  38 };
  39
  40 /* pci-i386.c */
  41
  42 extern unsigned int pcibios_max_latency;
  43
  44 void pcibios_resource_survey(void);
  45 int pcibios_enable_resources(struct pci_dev *, int);
  46
  47 /* pci-pc.c */
  48
  49 extern int pcibios_last_bus;
  50 extern struct pci_bus *pci_root_bus;
  51 extern struct pci_ops pci_root_ops;
  52
  53 /* pci-irq.c */
  54
  55 struct irq_info {
  56         u8 bus, devfn;                  /* Bus, device and function */
  57         struct {
  58                 u8 link;                /* IRQ line ID, chipset dependent, 0=not routed */
  59                 u16 bitmap;             /* Available IRQs */
  60         } __attribute__((packed)) irq[4];
  61         u8 slot;                        /* Slot number, 0=onboard */
  62         u8 rfu;
  63 } __attribute__((packed));
  64
  65 struct irq_routing_table {
  66         u32 signature;                  /* PIRQ_SIGNATURE should be here */
  67         u16 version;                    /* PIRQ_VERSION */
  68         u16 size;                       /* Table size in bytes */
  69         u8 rtr_bus, rtr_devfn;          /* Where the interrupt router lies */
  70         u16 exclusive_irqs;             /* IRQs devoted exclusively to PCI usage */
  71         u16 rtr_vendor, rtr_device;     /* Vendor and device ID of interrupt router */
  72         u32 miniport_data;              /* Crap */
  73         u8 rfu[11];
  74         u8 checksum;                    /* Modulo 256 checksum must give zero */
  75         struct irq_info slots[0];
  76 } __attribute__((packed));
  77
  78 extern unsigned int pcibios_irq_mask;
  79
  80 extern int pcibios_scanned;
  81 extern spinlock_t pci_config_lock;
  82
  83 extern int (*pcibios_enable_irq)(struct pci_dev *dev);
  84 extern void (*pcibios_disable_irq)(struct pci_dev *dev);
  85
  86 extern int pci_conf1_write(unsigned int seg, unsigned int bus,
  87                            unsigned int devfn, int reg, int len, u32 value);
  88 extern int pci_conf1_read(unsigned int seg, unsigned int bus,
  89                           unsigned int devfn, int reg, int len, u32 *value);
  90
  91 extern int pci_direct_probe(void);
  92 extern void pci_direct_init(int type);
  93 extern void pci_pcbios_init(void);
  94 extern void pci_mmcfg_init(int type);
  95 extern void pcibios_sort(void);
  96
  97 /* pci-mmconfig.c */
  98
  99 /* Verify the first 16 busses. We assume that systems with more busses
 100    get MCFG right. */
 101 #define PCI_MMCFG_MAX_CHECK_BUS 16
 102 extern DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*PCI_MMCFG_MAX_CHECK_BUS);
 103
 104 extern int __init pci_mmcfg_arch_reachable(unsigned int seg, unsigned int bus,
 105                                            unsigned int devfn);
 106 extern int __init pci_mmcfg_arch_init(void);
 107
 108 /*
 109  * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
 110  * on their northbrige except through the * %eax register. As such, you MUST
 111  * NOT use normal IOMEM accesses, you need to only use the magic mmio-config
 112  * accessor functions.
 113  * In fact just use pci_config_*, nothing else please.
 114  */
 115 static inline unsigned char mmio_config_readb(void __iomem *pos)
 116 {
 117         u8 val;
 118         asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
 119         return val;
 120 }
 121
 122 static inline unsigned short mmio_config_readw(void __iomem *pos)
 123 {
 124         u16 val;
 125         asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
 126         return val;
 127 }
 128
 129 static inline unsigned int mmio_config_readl(void __iomem *pos)
 130 {
 131         u32 val;
 132         asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
 133         return val;
 134 }
 135
 136 static inline void mmio_config_writeb(void __iomem *pos, u8 val)
 137 {
 138         asm volatile("movb %%al,(%1)" :: "a" (val), "r" (pos) : "memory");
 139 }
 140
 141 static inline void mmio_config_writew(void __iomem *pos, u16 val)
 142 {
 143         asm volatile("movw %%ax,(%1)" :: "a" (val), "r" (pos) : "memory");
 144 }
 145
 146 static inline void mmio_config_writel(void __iomem *pos, u32 val)
 147 {
 148         asm volatile("movl %%eax,(%1)" :: "a" (val), "r" (pos) : "memory");
 149 }