xref: /openbmc/linux/arch/x86/include/asm/pci_x86.h (revision 9d749629)
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, ...)				\
13 do {						\
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 
39 extern unsigned int pci_probe;
40 extern unsigned long pirq_table_addr;
41 
42 enum 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 
51 void pcibios_resource_survey(void);
52 void pcibios_set_cache_line_size(void);
53 
54 /* pci-pc.c */
55 
56 extern int pcibios_last_bus;
57 extern struct pci_bus *pci_root_bus;
58 extern struct pci_ops pci_root_ops;
59 
60 void pcibios_scan_specific_bus(int busn);
61 
62 /* pci-irq.c */
63 
64 struct irq_info {
65 	u8 bus, devfn;			/* Bus, device and function */
66 	struct {
67 		u8 link;		/* IRQ line ID, chipset dependent,
68 					   0 = not routed */
69 		u16 bitmap;		/* Available IRQs */
70 	} __attribute__((packed)) irq[4];
71 	u8 slot;			/* Slot number, 0=onboard */
72 	u8 rfu;
73 } __attribute__((packed));
74 
75 struct irq_routing_table {
76 	u32 signature;			/* PIRQ_SIGNATURE should be here */
77 	u16 version;			/* PIRQ_VERSION */
78 	u16 size;			/* Table size in bytes */
79 	u8 rtr_bus, rtr_devfn;		/* Where the interrupt router lies */
80 	u16 exclusive_irqs;		/* IRQs devoted exclusively to
81 					   PCI usage */
82 	u16 rtr_vendor, rtr_device;	/* Vendor and device ID of
83 					   interrupt router */
84 	u32 miniport_data;		/* Crap */
85 	u8 rfu[11];
86 	u8 checksum;			/* Modulo 256 checksum must give 0 */
87 	struct irq_info slots[0];
88 } __attribute__((packed));
89 
90 extern unsigned int pcibios_irq_mask;
91 
92 extern raw_spinlock_t pci_config_lock;
93 
94 extern int (*pcibios_enable_irq)(struct pci_dev *dev);
95 extern void (*pcibios_disable_irq)(struct pci_dev *dev);
96 
97 struct pci_raw_ops {
98 	int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
99 						int reg, int len, u32 *val);
100 	int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
101 						int reg, int len, u32 val);
102 };
103 
104 extern const struct pci_raw_ops *raw_pci_ops;
105 extern const struct pci_raw_ops *raw_pci_ext_ops;
106 
107 extern const struct pci_raw_ops pci_mmcfg;
108 extern const struct pci_raw_ops pci_direct_conf1;
109 extern bool port_cf9_safe;
110 
111 /* arch_initcall level */
112 extern int pci_direct_probe(void);
113 extern void pci_direct_init(int type);
114 extern void pci_pcbios_init(void);
115 extern void __init dmi_check_pciprobe(void);
116 extern void __init dmi_check_skip_isa_align(void);
117 
118 /* some common used subsys_initcalls */
119 extern int __init pci_acpi_init(void);
120 extern void __init pcibios_irq_init(void);
121 extern int __init pcibios_init(void);
122 extern int pci_legacy_init(void);
123 extern void pcibios_fixup_irqs(void);
124 
125 /* pci-mmconfig.c */
126 
127 /* "PCI MMCONFIG %04x [bus %02x-%02x]" */
128 #define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
129 
130 struct pci_mmcfg_region {
131 	struct list_head list;
132 	struct resource res;
133 	u64 address;
134 	char __iomem *virt;
135 	u16 segment;
136 	u8 start_bus;
137 	u8 end_bus;
138 	char name[PCI_MMCFG_RESOURCE_NAME_LEN];
139 };
140 
141 extern int __init pci_mmcfg_arch_init(void);
142 extern void __init pci_mmcfg_arch_free(void);
143 extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
144 extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
145 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
146 			       phys_addr_t addr);
147 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
148 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
149 
150 extern struct list_head pci_mmcfg_list;
151 
152 #define PCI_MMCFG_BUS_OFFSET(bus)      ((bus) << 20)
153 
154 /*
155  * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
156  * on their northbrige except through the * %eax register. As such, you MUST
157  * NOT use normal IOMEM accesses, you need to only use the magic mmio-config
158  * accessor functions.
159  * In fact just use pci_config_*, nothing else please.
160  */
161 static inline unsigned char mmio_config_readb(void __iomem *pos)
162 {
163 	u8 val;
164 	asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
165 	return val;
166 }
167 
168 static inline unsigned short mmio_config_readw(void __iomem *pos)
169 {
170 	u16 val;
171 	asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
172 	return val;
173 }
174 
175 static inline unsigned int mmio_config_readl(void __iomem *pos)
176 {
177 	u32 val;
178 	asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
179 	return val;
180 }
181 
182 static inline void mmio_config_writeb(void __iomem *pos, u8 val)
183 {
184 	asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory");
185 }
186 
187 static inline void mmio_config_writew(void __iomem *pos, u16 val)
188 {
189 	asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory");
190 }
191 
192 static inline void mmio_config_writel(void __iomem *pos, u32 val)
193 {
194 	asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory");
195 }
196 
197 #ifdef CONFIG_PCI
198 # ifdef CONFIG_ACPI
199 #  define x86_default_pci_init		pci_acpi_init
200 # else
201 #  define x86_default_pci_init		pci_legacy_init
202 # endif
203 # define x86_default_pci_init_irq	pcibios_irq_init
204 # define x86_default_pci_fixup_irqs	pcibios_fixup_irqs
205 #else
206 # define x86_default_pci_init		NULL
207 # define x86_default_pci_init_irq	NULL
208 # define x86_default_pci_fixup_irqs	NULL
209 #endif
210