xref: /openbmc/linux/arch/x86/include/asm/pci_x86.h (revision 711aab1d)
1 /*
2  *	Low-Level PCI Access for i386 machines.
3  *
4  *	(c) 1999 Martin Mares <mj@ucw.cz>
5  */
6 
7 #include <linux/ioport.h>
8 
9 #undef DEBUG
10 
11 #ifdef DEBUG
12 #define DBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
13 #else
14 #define DBG(fmt, ...)				\
15 do {						\
16 	if (0)					\
17 		printk(fmt, ##__VA_ARGS__);	\
18 } while (0)
19 #endif
20 
21 #define PCI_PROBE_BIOS		0x0001
22 #define PCI_PROBE_CONF1		0x0002
23 #define PCI_PROBE_CONF2		0x0004
24 #define PCI_PROBE_MMCONF	0x0008
25 #define PCI_PROBE_MASK		0x000f
26 #define PCI_PROBE_NOEARLY	0x0010
27 
28 #define PCI_NO_CHECKS		0x0400
29 #define PCI_USE_PIRQ_MASK	0x0800
30 #define PCI_ASSIGN_ROMS		0x1000
31 #define PCI_BIOS_IRQ_SCAN	0x2000
32 #define PCI_ASSIGN_ALL_BUSSES	0x4000
33 #define PCI_CAN_SKIP_ISA_ALIGN	0x8000
34 #define PCI_USE__CRS		0x10000
35 #define PCI_CHECK_ENABLE_AMD_MMCONF	0x20000
36 #define PCI_HAS_IO_ECS		0x40000
37 #define PCI_NOASSIGN_ROMS	0x80000
38 #define PCI_ROOT_NO_CRS		0x100000
39 #define PCI_NOASSIGN_BARS	0x200000
40 
41 extern unsigned int pci_probe;
42 extern unsigned long pirq_table_addr;
43 
44 enum pci_bf_sort_state {
45 	pci_bf_sort_default,
46 	pci_force_nobf,
47 	pci_force_bf,
48 	pci_dmi_bf,
49 };
50 
51 /* pci-i386.c */
52 
53 void pcibios_resource_survey(void);
54 void pcibios_set_cache_line_size(void);
55 
56 /* pci-pc.c */
57 
58 extern int pcibios_last_bus;
59 extern struct pci_ops pci_root_ops;
60 
61 void pcibios_scan_specific_bus(int busn);
62 
63 /* pci-irq.c */
64 
65 struct irq_info {
66 	u8 bus, devfn;			/* Bus, device and function */
67 	struct {
68 		u8 link;		/* IRQ line ID, chipset dependent,
69 					   0 = not routed */
70 		u16 bitmap;		/* Available IRQs */
71 	} __attribute__((packed)) irq[4];
72 	u8 slot;			/* Slot number, 0=onboard */
73 	u8 rfu;
74 } __attribute__((packed));
75 
76 struct irq_routing_table {
77 	u32 signature;			/* PIRQ_SIGNATURE should be here */
78 	u16 version;			/* PIRQ_VERSION */
79 	u16 size;			/* Table size in bytes */
80 	u8 rtr_bus, rtr_devfn;		/* Where the interrupt router lies */
81 	u16 exclusive_irqs;		/* IRQs devoted exclusively to
82 					   PCI usage */
83 	u16 rtr_vendor, rtr_device;	/* Vendor and device ID of
84 					   interrupt router */
85 	u32 miniport_data;		/* Crap */
86 	u8 rfu[11];
87 	u8 checksum;			/* Modulo 256 checksum must give 0 */
88 	struct irq_info slots[0];
89 } __attribute__((packed));
90 
91 extern unsigned int pcibios_irq_mask;
92 
93 extern raw_spinlock_t pci_config_lock;
94 
95 extern int (*pcibios_enable_irq)(struct pci_dev *dev);
96 extern void (*pcibios_disable_irq)(struct pci_dev *dev);
97 
98 extern bool mp_should_keep_irq(struct device *dev);
99 
100 struct pci_raw_ops {
101 	int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
102 						int reg, int len, u32 *val);
103 	int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
104 						int reg, int len, u32 val);
105 };
106 
107 extern const struct pci_raw_ops *raw_pci_ops;
108 extern const struct pci_raw_ops *raw_pci_ext_ops;
109 
110 extern const struct pci_raw_ops pci_mmcfg;
111 extern const struct pci_raw_ops pci_direct_conf1;
112 extern bool port_cf9_safe;
113 
114 /* arch_initcall level */
115 extern int pci_direct_probe(void);
116 extern void pci_direct_init(int type);
117 extern void pci_pcbios_init(void);
118 extern void __init dmi_check_pciprobe(void);
119 extern void __init dmi_check_skip_isa_align(void);
120 
121 /* some common used subsys_initcalls */
122 extern int __init pci_acpi_init(void);
123 extern void __init pcibios_irq_init(void);
124 extern int __init pcibios_init(void);
125 extern int pci_legacy_init(void);
126 extern void pcibios_fixup_irqs(void);
127 
128 /* pci-mmconfig.c */
129 
130 /* "PCI MMCONFIG %04x [bus %02x-%02x]" */
131 #define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
132 
133 struct pci_mmcfg_region {
134 	struct list_head list;
135 	struct resource res;
136 	u64 address;
137 	char __iomem *virt;
138 	u16 segment;
139 	u8 start_bus;
140 	u8 end_bus;
141 	char name[PCI_MMCFG_RESOURCE_NAME_LEN];
142 };
143 
144 extern int __init pci_mmcfg_arch_init(void);
145 extern void __init pci_mmcfg_arch_free(void);
146 extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
147 extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
148 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
149 			       phys_addr_t addr);
150 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
151 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
152 
153 extern struct list_head pci_mmcfg_list;
154 
155 #define PCI_MMCFG_BUS_OFFSET(bus)      ((bus) << 20)
156 
157 /*
158  * On AMD Fam10h CPUs, all PCI MMIO configuration space accesses must use
159  * %eax.  No other source or target registers may be used.  The following
160  * mmio_config_* accessors enforce this.  See "BIOS and Kernel Developer's
161  * Guide (BKDG) For AMD Family 10h Processors", rev. 3.48, sec 2.11.1,
162  * "MMIO Configuration Coding Requirements".
163  */
164 static inline unsigned char mmio_config_readb(void __iomem *pos)
165 {
166 	u8 val;
167 	asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
168 	return val;
169 }
170 
171 static inline unsigned short mmio_config_readw(void __iomem *pos)
172 {
173 	u16 val;
174 	asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
175 	return val;
176 }
177 
178 static inline unsigned int mmio_config_readl(void __iomem *pos)
179 {
180 	u32 val;
181 	asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
182 	return val;
183 }
184 
185 static inline void mmio_config_writeb(void __iomem *pos, u8 val)
186 {
187 	asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory");
188 }
189 
190 static inline void mmio_config_writew(void __iomem *pos, u16 val)
191 {
192 	asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory");
193 }
194 
195 static inline void mmio_config_writel(void __iomem *pos, u32 val)
196 {
197 	asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory");
198 }
199 
200 #ifdef CONFIG_PCI
201 # ifdef CONFIG_ACPI
202 #  define x86_default_pci_init		pci_acpi_init
203 # else
204 #  define x86_default_pci_init		pci_legacy_init
205 # endif
206 # define x86_default_pci_init_irq	pcibios_irq_init
207 # define x86_default_pci_fixup_irqs	pcibios_fixup_irqs
208 #else
209 # define x86_default_pci_init		NULL
210 # define x86_default_pci_init_irq	NULL
211 # define x86_default_pci_fixup_irqs	NULL
212 #endif
213