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