1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Low-Level PCI Access for i386 machines.
4 *
5 * (c) 1999 Martin Mares <mj@ucw.cz>
6 */
7
8 #include <linux/ioport.h>
9
10 #undef DEBUG
11
12 #ifdef DEBUG
13 #define DBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
14 #else
15 #define DBG(fmt, ...) \
16 do { \
17 if (0) \
18 printk(fmt, ##__VA_ARGS__); \
19 } while (0)
20 #endif
21
22 #define PCI_PROBE_BIOS 0x0001
23 #define PCI_PROBE_CONF1 0x0002
24 #define PCI_PROBE_CONF2 0x0004
25 #define PCI_PROBE_MMCONF 0x0008
26 #define PCI_PROBE_MASK 0x000f
27 #define PCI_PROBE_NOEARLY 0x0010
28
29 #define PCI_NO_CHECKS 0x0400
30 #define PCI_USE_PIRQ_MASK 0x0800
31 #define PCI_ASSIGN_ROMS 0x1000
32 #define PCI_BIOS_IRQ_SCAN 0x2000
33 #define PCI_ASSIGN_ALL_BUSSES 0x4000
34 #define PCI_CAN_SKIP_ISA_ALIGN 0x8000
35 #define PCI_USE__CRS 0x10000
36 #define PCI_CHECK_ENABLE_AMD_MMCONF 0x20000
37 #define PCI_HAS_IO_ECS 0x40000
38 #define PCI_NOASSIGN_ROMS 0x80000
39 #define PCI_ROOT_NO_CRS 0x100000
40 #define PCI_NOASSIGN_BARS 0x200000
41 #define PCI_BIG_ROOT_WINDOW 0x400000
42
43 extern unsigned int pci_probe;
44 extern unsigned long pirq_table_addr;
45
46 enum pci_bf_sort_state {
47 pci_bf_sort_default,
48 pci_force_nobf,
49 pci_force_bf,
50 pci_dmi_bf,
51 };
52
53 /* pci-i386.c */
54
55 void pcibios_resource_survey(void);
56 void pcibios_set_cache_line_size(void);
57
58 /* pci-pc.c */
59
60 extern int pcibios_last_bus;
61 extern struct pci_ops pci_root_ops;
62
63 void pcibios_scan_specific_bus(int busn);
64
65 /* pci-irq.c */
66
67 struct irq_info {
68 u8 bus, devfn; /* Bus, device and function */
69 struct {
70 u8 link; /* IRQ line ID, chipset dependent,
71 0 = not routed */
72 u16 bitmap; /* Available IRQs */
73 } __attribute__((packed)) irq[4];
74 u8 slot; /* Slot number, 0=onboard */
75 u8 rfu;
76 } __attribute__((packed));
77
78 struct irq_routing_table {
79 u32 signature; /* PIRQ_SIGNATURE should be here */
80 u16 version; /* PIRQ_VERSION */
81 u16 size; /* Table size in bytes */
82 u8 rtr_bus, rtr_devfn; /* Where the interrupt router lies */
83 u16 exclusive_irqs; /* IRQs devoted exclusively to
84 PCI usage */
85 u16 rtr_vendor, rtr_device; /* Vendor and device ID of
86 interrupt router */
87 u32 miniport_data; /* Crap */
88 u8 rfu[11];
89 u8 checksum; /* Modulo 256 checksum must give 0 */
90 struct irq_info slots[0];
91 } __attribute__((packed));
92
93 extern unsigned int pcibios_irq_mask;
94
95 extern raw_spinlock_t pci_config_lock;
96
97 extern int (*pcibios_enable_irq)(struct pci_dev *dev);
98 extern void (*pcibios_disable_irq)(struct pci_dev *dev);
99
100 extern bool mp_should_keep_irq(struct device *dev);
101
102 struct pci_raw_ops {
103 int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
104 int reg, int len, u32 *val);
105 int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
106 int reg, int len, u32 val);
107 };
108
109 extern const struct pci_raw_ops *raw_pci_ops;
110 extern const struct pci_raw_ops *raw_pci_ext_ops;
111
112 extern const struct pci_raw_ops pci_mmcfg;
113 extern const struct pci_raw_ops pci_direct_conf1;
114 extern bool port_cf9_safe;
115
116 /* arch_initcall level */
117 extern int pci_direct_probe(void);
118 extern void pci_direct_init(int type);
119 extern void pci_pcbios_init(void);
120 extern void __init dmi_check_pciprobe(void);
121 extern void __init dmi_check_skip_isa_align(void);
122
123 /* some common used subsys_initcalls */
124 #ifdef CONFIG_PCI
125 extern int __init pci_acpi_init(void);
126 #else
pci_acpi_init(void)127 static inline int __init pci_acpi_init(void)
128 {
129 return -EINVAL;
130 }
131 #endif
132 extern void __init pcibios_irq_init(void);
133 extern int __init pcibios_init(void);
134 extern int pci_legacy_init(void);
135 extern void pcibios_fixup_irqs(void);
136
137 /* pci-mmconfig.c */
138
139 /* "PCI MMCONFIG %04x [bus %02x-%02x]" */
140 #define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
141
142 struct pci_mmcfg_region {
143 struct list_head list;
144 struct resource res;
145 u64 address;
146 char __iomem *virt;
147 u16 segment;
148 u8 start_bus;
149 u8 end_bus;
150 char name[PCI_MMCFG_RESOURCE_NAME_LEN];
151 };
152
153 extern int __init pci_mmcfg_arch_init(void);
154 extern void __init pci_mmcfg_arch_free(void);
155 extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
156 extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
157 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
158 phys_addr_t addr);
159 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
160 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
161 extern struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
162 int end, u64 addr);
163
164 extern struct list_head pci_mmcfg_list;
165
166 #define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20)
167
168 /*
169 * On AMD Fam10h CPUs, all PCI MMIO configuration space accesses must use
170 * %eax. No other source or target registers may be used. The following
171 * mmio_config_* accessors enforce this. See "BIOS and Kernel Developer's
172 * Guide (BKDG) For AMD Family 10h Processors", rev. 3.48, sec 2.11.1,
173 * "MMIO Configuration Coding Requirements".
174 */
mmio_config_readb(void __iomem * pos)175 static inline unsigned char mmio_config_readb(void __iomem *pos)
176 {
177 u8 val;
178 asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
179 return val;
180 }
181
mmio_config_readw(void __iomem * pos)182 static inline unsigned short mmio_config_readw(void __iomem *pos)
183 {
184 u16 val;
185 asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
186 return val;
187 }
188
mmio_config_readl(void __iomem * pos)189 static inline unsigned int mmio_config_readl(void __iomem *pos)
190 {
191 u32 val;
192 asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
193 return val;
194 }
195
mmio_config_writeb(void __iomem * pos,u8 val)196 static inline void mmio_config_writeb(void __iomem *pos, u8 val)
197 {
198 asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory");
199 }
200
mmio_config_writew(void __iomem * pos,u16 val)201 static inline void mmio_config_writew(void __iomem *pos, u16 val)
202 {
203 asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory");
204 }
205
mmio_config_writel(void __iomem * pos,u32 val)206 static inline void mmio_config_writel(void __iomem *pos, u32 val)
207 {
208 asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory");
209 }
210
211 #ifdef CONFIG_PCI
212 # ifdef CONFIG_ACPI
213 # define x86_default_pci_init pci_acpi_init
214 # else
215 # define x86_default_pci_init pci_legacy_init
216 # endif
217 # define x86_default_pci_init_irq pcibios_irq_init
218 # define x86_default_pci_fixup_irqs pcibios_fixup_irqs
219 #else
220 # define x86_default_pci_init NULL
221 # define x86_default_pci_init_irq NULL
222 # define x86_default_pci_fixup_irqs NULL
223 #endif
224