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