pci_x86.h

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/*
 *  Low-Level PCI Access for i386 machines.
 *
 *  (c) 1999 Martin Mares <[email protected]>
 */

#undef DEBUG

#ifdef DEBUG
#define DBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
#else
#define DBG(fmt, ...)               \
do {                        \
    if (0)                  \
        printk(fmt, ##__VA_ARGS__); \
} while (0)
#endif

#define PCI_PROBE_BIOS      0x0001
#define PCI_PROBE_CONF1     0x0002
#define PCI_PROBE_CONF2     0x0004
#define PCI_PROBE_MMCONF    0x0008
#define PCI_PROBE_MASK      0x000f
#define PCI_PROBE_NOEARLY   0x0010

#define PCI_NO_CHECKS       0x0400
#define PCI_USE_PIRQ_MASK   0x0800
#define PCI_ASSIGN_ROMS     0x1000
#define PCI_BIOS_IRQ_SCAN   0x2000
#define PCI_ASSIGN_ALL_BUSSES   0x4000
#define PCI_CAN_SKIP_ISA_ALIGN  0x8000
#define PCI_USE__CRS        0x10000
#define PCI_CHECK_ENABLE_AMD_MMCONF 0x20000
#define PCI_HAS_IO_ECS      0x40000
#define PCI_NOASSIGN_ROMS   0x80000
#define PCI_ROOT_NO_CRS     0x100000
#define PCI_NOASSIGN_BARS   0x200000

extern unsigned int pci_probe;
extern unsigned long pirq_table_addr;

enum pci_bf_sort_state {
    pci_bf_sort_default,
    pci_force_nobf,
    pci_force_bf,
    pci_dmi_bf,
};

/* pci-i386.c */

void pcibios_resource_survey(void);
void pcibios_set_cache_line_size(void);

/* pci-pc.c */

extern int pcibios_last_bus;
extern struct pci_bus *pci_root_bus;
extern struct pci_ops pci_root_ops;

void pcibios_scan_specific_bus(int busn);

/* pci-irq.c */

struct irq_info {
    u8 bus, devfn;          /* Bus, device and function */
    struct {
        u8 link;        /* IRQ line ID, chipset dependent,
                       0 = not routed */
        u16 bitmap;     /* Available IRQs */
    } __attribute__((packed)) irq[4];
    u8 slot;            /* Slot number, 0=onboard */
    u8 rfu;
} __attribute__((packed));

struct irq_routing_table {
    u32 signature;          /* PIRQ_SIGNATURE should be here */
    u16 version;            /* PIRQ_VERSION */
    u16 size;           /* Table size in bytes */
    u8 rtr_bus, rtr_devfn;      /* Where the interrupt router lies */
    u16 exclusive_irqs;     /* IRQs devoted exclusively to
                       PCI usage */
    u16 rtr_vendor, rtr_device; /* Vendor and device ID of
                       interrupt router */
    u32 miniport_data;      /* Crap */
    u8 rfu[11];
    u8 checksum;            /* Modulo 256 checksum must give 0 */
    struct irq_info slots[0];
} __attribute__((packed));

extern unsigned int pcibios_irq_mask;

extern raw_spinlock_t pci_config_lock;

extern int (*pcibios_enable_irq)(struct pci_dev *dev);
extern void (*pcibios_disable_irq)(struct pci_dev *dev);

struct pci_raw_ops {
    int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
                        int reg, int len, u32 *val);
    int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
                        int reg, int len, u32 val);
};

extern const struct pci_raw_ops *raw_pci_ops;
extern const struct pci_raw_ops *raw_pci_ext_ops;

extern const struct pci_raw_ops pci_mmcfg;
extern const struct pci_raw_ops pci_direct_conf1;
extern bool port_cf9_safe;

/* arch_initcall level */
extern int pci_direct_probe(void);
extern void pci_direct_init(int type);
extern void pci_pcbios_init(void);
extern void __init dmi_check_pciprobe(void);
extern void __init dmi_check_skip_isa_align(void);

/* some common used subsys_initcalls */
extern int __init pci_acpi_init(void);
extern void __init pcibios_irq_init(void);
extern int __init pcibios_init(void);
extern int pci_legacy_init(void);
extern void pcibios_fixup_irqs(void);

/* pci-mmconfig.c */

/* "PCI MMCONFIG %04x [bus %02x-%02x]" */
#define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)

struct pci_mmcfg_region {
    struct list_head list;
    struct resource res;
    u64 address;
    char __iomem *virt;
    u16 segment;
    u8 start_bus;
    u8 end_bus;
    char name[PCI_MMCFG_RESOURCE_NAME_LEN];
};

extern int __init pci_mmcfg_arch_init(void);
extern void __init pci_mmcfg_arch_free(void);
extern int __devinit pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
extern int __devinit pci_mmconfig_insert(struct device *dev,
                     u16 seg, u8 start,
                     u8 end, phys_addr_t addr);
extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);

extern struct list_head pci_mmcfg_list;

#define PCI_MMCFG_BUS_OFFSET(bus)      ((bus) << 20)

/*
 * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
 * on their northbrige except through the * %eax register. As such, you MUST
 * NOT use normal IOMEM accesses, you need to only use the magic mmio-config
 * accessor functions.
 * In fact just use pci_config_*, nothing else please.
 */
static inline unsigned char mmio_config_readb(void __iomem *pos)
{
    u8 val;
    asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
    return val;
}

static inline unsigned short mmio_config_readw(void __iomem *pos)
{
    u16 val;
    asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
    return val;
}

static inline unsigned int mmio_config_readl(void __iomem *pos)
{
    u32 val;
    asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
    return val;
}

static inline void mmio_config_writeb(void __iomem *pos, u8 val)
{
    asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory");
}

static inline void mmio_config_writew(void __iomem *pos, u16 val)
{
    asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory");
}

static inline void mmio_config_writel(void __iomem *pos, u32 val)
{
    asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory");
}

#ifdef CONFIG_PCI
# ifdef CONFIG_ACPI
#  define x86_default_pci_init      pci_acpi_init
# else
#  define x86_default_pci_init      pci_legacy_init
# endif
# define x86_default_pci_init_irq   pcibios_irq_init
# define x86_default_pci_fixup_irqs pcibios_fixup_irqs
#else
# define x86_default_pci_init       NULL
# define x86_default_pci_init_irq   NULL
# define x86_default_pci_fixup_irqs NULL
#endif