1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Architecture specific OF callbacks. 4 */ 5 #include <linux/export.h> 6 #include <linux/io.h> 7 #include <linux/interrupt.h> 8 #include <linux/list.h> 9 #include <linux/of.h> 10 #include <linux/of_fdt.h> 11 #include <linux/of_address.h> 12 #include <linux/of_platform.h> 13 #include <linux/of_irq.h> 14 #include <linux/libfdt.h> 15 #include <linux/slab.h> 16 #include <linux/pci.h> 17 #include <linux/of_pci.h> 18 #include <linux/initrd.h> 19 20 #include <asm/irqdomain.h> 21 #include <asm/hpet.h> 22 #include <asm/apic.h> 23 #include <asm/io_apic.h> 24 #include <asm/pci_x86.h> 25 #include <asm/setup.h> 26 #include <asm/i8259.h> 27 #include <asm/prom.h> 28 29 __initdata u64 initial_dtb; 30 char __initdata cmd_line[COMMAND_LINE_SIZE]; 31 32 int __initdata of_ioapic; 33 34 void __init early_init_dt_scan_chosen_arch(unsigned long node) 35 { 36 BUG(); 37 } 38 39 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 40 { 41 BUG(); 42 } 43 44 void __init add_dtb(u64 data) 45 { 46 initial_dtb = data + offsetof(struct setup_data, data); 47 } 48 49 /* 50 * CE4100 ids. Will be moved to machine_device_initcall() once we have it. 51 */ 52 static struct of_device_id __initdata ce4100_ids[] = { 53 { .compatible = "intel,ce4100-cp", }, 54 { .compatible = "isa", }, 55 { .compatible = "pci", }, 56 {}, 57 }; 58 59 static int __init add_bus_probe(void) 60 { 61 if (!of_have_populated_dt()) 62 return 0; 63 64 return of_platform_bus_probe(NULL, ce4100_ids, NULL); 65 } 66 device_initcall(add_bus_probe); 67 68 #ifdef CONFIG_PCI 69 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) 70 { 71 struct device_node *np; 72 73 for_each_node_by_type(np, "pci") { 74 const void *prop; 75 unsigned int bus_min; 76 77 prop = of_get_property(np, "bus-range", NULL); 78 if (!prop) 79 continue; 80 bus_min = be32_to_cpup(prop); 81 if (bus->number == bus_min) 82 return np; 83 } 84 return NULL; 85 } 86 87 static int x86_of_pci_irq_enable(struct pci_dev *dev) 88 { 89 u32 virq; 90 int ret; 91 u8 pin; 92 93 ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); 94 if (ret) 95 return ret; 96 if (!pin) 97 return 0; 98 99 virq = of_irq_parse_and_map_pci(dev, 0, 0); 100 if (virq == 0) 101 return -EINVAL; 102 dev->irq = virq; 103 return 0; 104 } 105 106 static void x86_of_pci_irq_disable(struct pci_dev *dev) 107 { 108 } 109 110 void x86_of_pci_init(void) 111 { 112 pcibios_enable_irq = x86_of_pci_irq_enable; 113 pcibios_disable_irq = x86_of_pci_irq_disable; 114 } 115 #endif 116 117 static void __init dtb_setup_hpet(void) 118 { 119 #ifdef CONFIG_HPET_TIMER 120 struct device_node *dn; 121 struct resource r; 122 int ret; 123 124 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet"); 125 if (!dn) 126 return; 127 ret = of_address_to_resource(dn, 0, &r); 128 if (ret) { 129 WARN_ON(1); 130 return; 131 } 132 hpet_address = r.start; 133 #endif 134 } 135 136 #ifdef CONFIG_X86_LOCAL_APIC 137 138 static void __init dtb_cpu_setup(void) 139 { 140 struct device_node *dn; 141 u32 apic_id, version; 142 143 version = GET_APIC_VERSION(apic_read(APIC_LVR)); 144 for_each_of_cpu_node(dn) { 145 apic_id = of_get_cpu_hwid(dn, 0); 146 if (apic_id == ~0U) { 147 pr_warn("%pOF: missing local APIC ID\n", dn); 148 continue; 149 } 150 generic_processor_info(apic_id, version); 151 } 152 } 153 154 static void __init dtb_lapic_setup(void) 155 { 156 struct device_node *dn; 157 struct resource r; 158 unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE; 159 int ret; 160 161 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic"); 162 if (dn) { 163 ret = of_address_to_resource(dn, 0, &r); 164 if (WARN_ON(ret)) 165 return; 166 lapic_addr = r.start; 167 } 168 169 /* Did the boot loader setup the local APIC ? */ 170 if (!boot_cpu_has(X86_FEATURE_APIC)) { 171 if (apic_force_enable(lapic_addr)) 172 return; 173 } 174 smp_found_config = 1; 175 pic_mode = 1; 176 register_lapic_address(lapic_addr); 177 } 178 179 #endif /* CONFIG_X86_LOCAL_APIC */ 180 181 #ifdef CONFIG_X86_IO_APIC 182 static unsigned int ioapic_id; 183 184 struct of_ioapic_type { 185 u32 out_type; 186 u32 is_level; 187 u32 active_low; 188 }; 189 190 static struct of_ioapic_type of_ioapic_type[] = 191 { 192 { 193 .out_type = IRQ_TYPE_EDGE_FALLING, 194 .is_level = 0, 195 .active_low = 1, 196 }, 197 { 198 .out_type = IRQ_TYPE_LEVEL_HIGH, 199 .is_level = 1, 200 .active_low = 0, 201 }, 202 { 203 .out_type = IRQ_TYPE_LEVEL_LOW, 204 .is_level = 1, 205 .active_low = 1, 206 }, 207 { 208 .out_type = IRQ_TYPE_EDGE_RISING, 209 .is_level = 0, 210 .active_low = 0, 211 }, 212 }; 213 214 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq, 215 unsigned int nr_irqs, void *arg) 216 { 217 struct irq_fwspec *fwspec = (struct irq_fwspec *)arg; 218 struct of_ioapic_type *it; 219 struct irq_alloc_info tmp; 220 int type_index; 221 222 if (WARN_ON(fwspec->param_count < 2)) 223 return -EINVAL; 224 225 type_index = fwspec->param[1]; 226 if (type_index >= ARRAY_SIZE(of_ioapic_type)) 227 return -EINVAL; 228 229 it = &of_ioapic_type[type_index]; 230 ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->is_level, it->active_low); 231 tmp.devid = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain)); 232 tmp.ioapic.pin = fwspec->param[0]; 233 234 return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp); 235 } 236 237 static const struct irq_domain_ops ioapic_irq_domain_ops = { 238 .alloc = dt_irqdomain_alloc, 239 .free = mp_irqdomain_free, 240 .activate = mp_irqdomain_activate, 241 .deactivate = mp_irqdomain_deactivate, 242 }; 243 244 static void __init dtb_add_ioapic(struct device_node *dn) 245 { 246 struct resource r; 247 int ret; 248 struct ioapic_domain_cfg cfg = { 249 .type = IOAPIC_DOMAIN_DYNAMIC, 250 .ops = &ioapic_irq_domain_ops, 251 .dev = dn, 252 }; 253 254 ret = of_address_to_resource(dn, 0, &r); 255 if (ret) { 256 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn); 257 return; 258 } 259 mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg); 260 } 261 262 static void __init dtb_ioapic_setup(void) 263 { 264 struct device_node *dn; 265 266 for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic") 267 dtb_add_ioapic(dn); 268 269 if (nr_ioapics) { 270 of_ioapic = 1; 271 return; 272 } 273 printk(KERN_ERR "Error: No information about IO-APIC in OF.\n"); 274 } 275 #else 276 static void __init dtb_ioapic_setup(void) {} 277 #endif 278 279 static void __init dtb_apic_setup(void) 280 { 281 #ifdef CONFIG_X86_LOCAL_APIC 282 dtb_lapic_setup(); 283 dtb_cpu_setup(); 284 #endif 285 dtb_ioapic_setup(); 286 } 287 288 #ifdef CONFIG_OF_EARLY_FLATTREE 289 static void __init x86_flattree_get_config(void) 290 { 291 u32 size, map_len; 292 void *dt; 293 294 if (!initial_dtb) 295 return; 296 297 map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128); 298 299 dt = early_memremap(initial_dtb, map_len); 300 size = fdt_totalsize(dt); 301 if (map_len < size) { 302 early_memunmap(dt, map_len); 303 dt = early_memremap(initial_dtb, size); 304 map_len = size; 305 } 306 307 early_init_dt_verify(dt); 308 unflatten_and_copy_device_tree(); 309 early_memunmap(dt, map_len); 310 } 311 #else 312 static inline void x86_flattree_get_config(void) { } 313 #endif 314 315 void __init x86_dtb_init(void) 316 { 317 x86_flattree_get_config(); 318 319 if (!of_have_populated_dt()) 320 return; 321 322 dtb_setup_hpet(); 323 dtb_apic_setup(); 324 } 325