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