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/errno.h>
9 #include <linux/init.h>
10 #include <linux/ioport.h>
11 #include <linux/spinlock.h>
12
13 #undef DEBUG
14
15 #ifdef DEBUG
16 #define DBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
17 #else
18 #define DBG(fmt, ...) \
19 do { \
20 if (0) \
21 printk(fmt, ##__VA_ARGS__); \
22 } while (0)
23 #endif
24
25 #define PCI_PROBE_BIOS 0x0001
26 #define PCI_PROBE_CONF1 0x0002
27 #define PCI_PROBE_CONF2 0x0004
28 #define PCI_PROBE_MMCONF 0x0008
29 #define PCI_PROBE_MASK 0x000f
30 #define PCI_PROBE_NOEARLY 0x0010
31
32 #define PCI_NO_CHECKS 0x0400
33 #define PCI_USE_PIRQ_MASK 0x0800
34 #define PCI_ASSIGN_ROMS 0x1000
35 #define PCI_BIOS_IRQ_SCAN 0x2000
36 #define PCI_ASSIGN_ALL_BUSSES 0x4000
37 #define PCI_CAN_SKIP_ISA_ALIGN 0x8000
38 #define PCI_USE__CRS 0x10000
39 #define PCI_CHECK_ENABLE_AMD_MMCONF 0x20000
40 #define PCI_HAS_IO_ECS 0x40000
41 #define PCI_NOASSIGN_ROMS 0x80000
42 #define PCI_ROOT_NO_CRS 0x100000
43 #define PCI_NOASSIGN_BARS 0x200000
44 #define PCI_BIG_ROOT_WINDOW 0x400000
45 #define PCI_USE_E820 0x800000
46 #define PCI_NO_E820 0x1000000
47
48 extern unsigned int pci_probe;
49 extern unsigned long pirq_table_addr;
50
51 enum pci_bf_sort_state {
52 pci_bf_sort_default,
53 pci_force_nobf,
54 pci_force_bf,
55 pci_dmi_bf,
56 };
57
58 /* pci-i386.c */
59
60 void pcibios_resource_survey(void);
61 void pcibios_set_cache_line_size(void);
62
63 /* pci-pc.c */
64
65 extern int pcibios_last_bus;
66 extern struct pci_ops pci_root_ops;
67
68 void pcibios_scan_specific_bus(int busn);
69
70 /* pci-irq.c */
71
72 struct pci_dev;
73
74 struct irq_info {
75 u8 bus, devfn; /* Bus, device and function */
76 struct {
77 u8 link; /* IRQ line ID, chipset dependent,
78 0 = not routed */
79 u16 bitmap; /* Available IRQs */
80 } __attribute__((packed)) irq[4];
81 u8 slot; /* Slot number, 0=onboard */
82 u8 rfu;
83 } __attribute__((packed));
84
85 struct irq_routing_table {
86 u32 signature; /* PIRQ_SIGNATURE should be here */
87 u16 version; /* PIRQ_VERSION */
88 u16 size; /* Table size in bytes */
89 u8 rtr_bus, rtr_devfn; /* Where the interrupt router lies */
90 u16 exclusive_irqs; /* IRQs devoted exclusively to
91 PCI usage */
92 u16 rtr_vendor, rtr_device; /* Vendor and device ID of
93 interrupt router */
94 u32 miniport_data; /* Crap */
95 u8 rfu[11];
96 u8 checksum; /* Modulo 256 checksum must give 0 */
97 struct irq_info slots[];
98 } __attribute__((packed));
99
100 struct irt_routing_table {
101 u32 signature; /* IRT_SIGNATURE should be here */
102 u8 size; /* Number of entries provided */
103 u8 used; /* Number of entries actually used */
104 u16 exclusive_irqs; /* IRQs devoted exclusively to
105 PCI usage */
106 struct irq_info slots[];
107 } __attribute__((packed));
108
109 extern unsigned int pcibios_irq_mask;
110
111 extern raw_spinlock_t pci_config_lock;
112
113 extern int (*pcibios_enable_irq)(struct pci_dev *dev);
114 extern void (*pcibios_disable_irq)(struct pci_dev *dev);
115
116 extern bool mp_should_keep_irq(struct device *dev);
117
118 struct pci_raw_ops {
119 int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
120 int reg, int len, u32 *val);
121 int (*write)(unsigned int domain, unsigned int bus, unsigned int devfn,
122 int reg, int len, u32 val);
123 };
124
125 extern const struct pci_raw_ops *raw_pci_ops;
126 extern const struct pci_raw_ops *raw_pci_ext_ops;
127
128 extern const struct pci_raw_ops pci_mmcfg;
129 extern const struct pci_raw_ops pci_direct_conf1;
130 extern bool port_cf9_safe;
131
132 /* arch_initcall level */
133 #ifdef CONFIG_PCI_DIRECT
134 extern int pci_direct_probe(void);
135 extern void pci_direct_init(int type);
136 #else
pci_direct_probe(void)137 static inline int pci_direct_probe(void) { return -1; }
pci_direct_init(int type)138 static inline void pci_direct_init(int type) { }
139 #endif
140
141 #ifdef CONFIG_PCI_BIOS
142 extern void pci_pcbios_init(void);
143 #else
pci_pcbios_init(void)144 static inline void pci_pcbios_init(void) { }
145 #endif
146
147 extern void __init dmi_check_pciprobe(void);
148 extern void __init dmi_check_skip_isa_align(void);
149
150 /* some common used subsys_initcalls */
151 #ifdef CONFIG_PCI
152 extern int __init pci_acpi_init(void);
153 #else
pci_acpi_init(void)154 static inline int __init pci_acpi_init(void)
155 {
156 return -EINVAL;
157 }
158 #endif
159 extern void __init pcibios_irq_init(void);
160 extern int __init pcibios_init(void);
161 extern int pci_legacy_init(void);
162 extern void pcibios_fixup_irqs(void);
163
164 /* pci-mmconfig.c */
165
166 /* "PCI MMCONFIG %04x [bus %02x-%02x]" */
167 #define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
168
169 struct pci_mmcfg_region {
170 struct list_head list;
171 struct resource res;
172 u64 address;
173 char __iomem *virt;
174 u16 segment;
175 u8 start_bus;
176 u8 end_bus;
177 char name[PCI_MMCFG_RESOURCE_NAME_LEN];
178 };
179
180 extern int __init pci_mmcfg_arch_init(void);
181 extern void __init pci_mmcfg_arch_free(void);
182 extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
183 extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
184 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
185 phys_addr_t addr);
186 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
187 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
188 extern struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
189 int end, u64 addr);
190
191 extern struct list_head pci_mmcfg_list;
192
193 #define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20)
194
195 /*
196 * On AMD Fam10h CPUs, all PCI MMIO configuration space accesses must use
197 * %eax. No other source or target registers may be used. The following
198 * mmio_config_* accessors enforce this. See "BIOS and Kernel Developer's
199 * Guide (BKDG) For AMD Family 10h Processors", rev. 3.48, sec 2.11.1,
200 * "MMIO Configuration Coding Requirements".
201 */
mmio_config_readb(void __iomem * pos)202 static inline unsigned char mmio_config_readb(void __iomem *pos)
203 {
204 u8 val;
205 asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
206 return val;
207 }
208
mmio_config_readw(void __iomem * pos)209 static inline unsigned short mmio_config_readw(void __iomem *pos)
210 {
211 u16 val;
212 asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
213 return val;
214 }
215
mmio_config_readl(void __iomem * pos)216 static inline unsigned int mmio_config_readl(void __iomem *pos)
217 {
218 u32 val;
219 asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
220 return val;
221 }
222
mmio_config_writeb(void __iomem * pos,u8 val)223 static inline void mmio_config_writeb(void __iomem *pos, u8 val)
224 {
225 asm volatile("movb %%al,(%1)" : : "a" (val), "r" (pos) : "memory");
226 }
227
mmio_config_writew(void __iomem * pos,u16 val)228 static inline void mmio_config_writew(void __iomem *pos, u16 val)
229 {
230 asm volatile("movw %%ax,(%1)" : : "a" (val), "r" (pos) : "memory");
231 }
232
mmio_config_writel(void __iomem * pos,u32 val)233 static inline void mmio_config_writel(void __iomem *pos, u32 val)
234 {
235 asm volatile("movl %%eax,(%1)" : : "a" (val), "r" (pos) : "memory");
236 }
237
238 #ifdef CONFIG_PCI
239 # ifdef CONFIG_ACPI
240 # define x86_default_pci_init pci_acpi_init
241 # else
242 # define x86_default_pci_init pci_legacy_init
243 # endif
244 # define x86_default_pci_init_irq pcibios_irq_init
245 # define x86_default_pci_fixup_irqs pcibios_fixup_irqs
246 #else
247 # define x86_default_pci_init NULL
248 # define x86_default_pci_init_irq NULL
249 # define x86_default_pci_fixup_irqs NULL
250 #endif
251
252 #if defined(CONFIG_PCI) && defined(CONFIG_ACPI)
253 extern bool pci_use_e820;
254 #else
255 #define pci_use_e820 false
256 #endif
257