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