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