arch/x86/kernel/devicetree.c

   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/hpet.h>
  20 #include <asm/irq_controller.h>
  21 #include <asm/apic.h>
  22 #include <asm/pci_x86.h>
  23
  24 __initdata u64 initial_dtb;
  25 char __initdata cmd_line[COMMAND_LINE_SIZE];
  26 static LIST_HEAD(irq_domains);
  27 static DEFINE_RAW_SPINLOCK(big_irq_lock);
  28
  29 int __initdata of_ioapic;
  30
  31 #ifdef CONFIG_X86_IO_APIC
  32 static void add_interrupt_host(struct irq_domain *ih)
  33 {
  34         unsigned long flags;
  35
  36         raw_spin_lock_irqsave(&big_irq_lock, flags);
  37         list_add(&ih->l, &irq_domains);
  38         raw_spin_unlock_irqrestore(&big_irq_lock, flags);
  39 }
  40 #endif
  41
  42 static struct irq_domain *get_ih_from_node(struct device_node *controller)
  43 {
  44         struct irq_domain *ih, *found = NULL;
  45         unsigned long flags;
  46
  47         raw_spin_lock_irqsave(&big_irq_lock, flags);
  48         list_for_each_entry(ih, &irq_domains, l) {
  49                 if (ih->controller ==  controller) {
  50                         found = ih;
  51                         break;
  52                 }
  53         }
  54         raw_spin_unlock_irqrestore(&big_irq_lock, flags);
  55         return found;
  56 }
  57
  58 unsigned int irq_create_of_mapping(struct device_node *controller,
  59                                    const u32 *intspec, unsigned int intsize)
  60 {
  61         struct irq_domain *ih;
  62         u32 virq, type;
  63         int ret;
  64
  65         ih = get_ih_from_node(controller);
  66         if (!ih)
  67                 return 0;
  68         ret = ih->xlate(ih, intspec, intsize, &virq, &type);
  69         if (ret)
  70                 return 0;
  71         if (type == IRQ_TYPE_NONE)
  72                 return virq;
  73         irq_set_irq_type(virq, type);
  74         return virq;
  75 }
  76 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
  77
  78 unsigned long pci_address_to_pio(phys_addr_t address)
  79 {
  80         /*
  81          * The ioport address can be directly used by inX / outX
  82          */
  83         BUG_ON(address >= (1 << 16));
  84         return (unsigned long)address;
  85 }
  86 EXPORT_SYMBOL_GPL(pci_address_to_pio);
  87
  88 void __init early_init_dt_scan_chosen_arch(unsigned long node)
  89 {
  90         BUG();
  91 }
  92
  93 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  94 {
  95         BUG();
  96 }
  97
  98 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  99 {
 100         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
 101 }
 102
 103 #ifdef CONFIG_BLK_DEV_INITRD
 104 void __init early_init_dt_setup_initrd_arch(unsigned long start,
 105                                             unsigned long end)
 106 {
 107         initrd_start = (unsigned long)__va(start);
 108         initrd_end = (unsigned long)__va(end);
 109         initrd_below_start_ok = 1;
 110 }
 111 #endif
 112
 113 void __init add_dtb(u64 data)
 114 {
 115         initial_dtb = data + offsetof(struct setup_data, data);
 116 }
 117
 118 /*
 119  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
 120  */
 121 static struct of_device_id __initdata ce4100_ids[] = {
 122         { .compatible = "intel,ce4100-cp", },
 123         { .compatible = "isa", },
 124         { .compatible = "pci", },
 125         {},
 126 };
 127
 128 static int __init add_bus_probe(void)
 129 {
 130         if (!of_have_populated_dt())
 131                 return 0;
 132
 133         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
 134 }
 135 module_init(add_bus_probe);
 136
 137 #ifdef CONFIG_PCI
 138 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
 139 {
 140         struct device_node *np;
 141
 142         for_each_node_by_type(np, "pci") {
 143                 const void *prop;
 144                 unsigned int bus_min;
 145
 146                 prop = of_get_property(np, "bus-range", NULL);
 147                 if (!prop)
 148                         continue;
 149                 bus_min = be32_to_cpup(prop);
 150                 if (bus->number == bus_min)
 151                         return np;
 152         }
 153         return NULL;
 154 }
 155
 156 static int x86_of_pci_irq_enable(struct pci_dev *dev)
 157 {
 158         struct of_irq oirq;
 159         u32 virq;
 160         int ret;
 161         u8 pin;
 162
 163         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
 164         if (ret)
 165                 return ret;
 166         if (!pin)
 167                 return 0;
 168
 169         ret = of_irq_map_pci(dev, &oirq);
 170         if (ret)
 171                 return ret;
 172
 173         virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
 174                         oirq.size);
 175         if (virq == 0)
 176                 return -EINVAL;
 177         dev->irq = virq;
 178         return 0;
 179 }
 180
 181 static void x86_of_pci_irq_disable(struct pci_dev *dev)
 182 {
 183 }
 184
 185 void __cpuinit x86_of_pci_init(void)
 186 {
 187         pcibios_enable_irq = x86_of_pci_irq_enable;
 188         pcibios_disable_irq = x86_of_pci_irq_disable;
 189 }
 190 #endif
 191
 192 static void __init dtb_setup_hpet(void)
 193 {
 194 #ifdef CONFIG_HPET_TIMER
 195         struct device_node *dn;
 196         struct resource r;
 197         int ret;
 198
 199         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
 200         if (!dn)
 201                 return;
 202         ret = of_address_to_resource(dn, 0, &r);
 203         if (ret) {
 204                 WARN_ON(1);
 205                 return;
 206         }
 207         hpet_address = r.start;
 208 #endif
 209 }
 210
 211 static void __init dtb_lapic_setup(void)
 212 {
 213 #ifdef CONFIG_X86_LOCAL_APIC
 214         struct device_node *dn;
 215         struct resource r;
 216         int ret;
 217
 218         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
 219         if (!dn)
 220                 return;
 221
 222         ret = of_address_to_resource(dn, 0, &r);
 223         if (WARN_ON(ret))
 224                 return;
 225
 226         /* Did the boot loader setup the local APIC ? */
 227         if (!cpu_has_apic) {
 228                 if (apic_force_enable(r.start))
 229                         return;
 230         }
 231         smp_found_config = 1;
 232         pic_mode = 1;
 233         register_lapic_address(r.start);
 234         generic_processor_info(boot_cpu_physical_apicid,
 235                                GET_APIC_VERSION(apic_read(APIC_LVR)));
 236 #endif
 237 }
 238
 239 #ifdef CONFIG_X86_IO_APIC
 240 static unsigned int ioapic_id;
 241
 242 static void __init dtb_add_ioapic(struct device_node *dn)
 243 {
 244         struct resource r;
 245         int ret;
 246
 247         ret = of_address_to_resource(dn, 0, &r);
 248         if (ret) {
 249                 printk(KERN_ERR "Can't obtain address from node %s.\n",
 250                                 dn->full_name);
 251                 return;
 252         }
 253         mp_register_ioapic(++ioapic_id, r.start, gsi_top);
 254 }
 255
 256 static void __init dtb_ioapic_setup(void)
 257 {
 258         struct device_node *dn;
 259
 260         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
 261                 dtb_add_ioapic(dn);
 262
 263         if (nr_ioapics) {
 264                 of_ioapic = 1;
 265                 return;
 266         }
 267         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
 268 }
 269 #else
 270 static void __init dtb_ioapic_setup(void) {}
 271 #endif
 272
 273 static void __init dtb_apic_setup(void)
 274 {
 275         dtb_lapic_setup();
 276         dtb_ioapic_setup();
 277 }
 278
 279 #ifdef CONFIG_OF_FLATTREE
 280 static void __init x86_flattree_get_config(void)
 281 {
 282         u32 size, map_len;
 283         void *new_dtb;
 284
 285         if (!initial_dtb)
 286                 return;
 287
 288         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK),
 289                         (u64)sizeof(struct boot_param_header));
 290
 291         initial_boot_params = early_memremap(initial_dtb, map_len);
 292         size = be32_to_cpu(initial_boot_params->totalsize);
 293         if (map_len < size) {
 294                 early_iounmap(initial_boot_params, map_len);
 295                 initial_boot_params = early_memremap(initial_dtb, size);
 296                 map_len = size;
 297         }
 298
 299         new_dtb = alloc_bootmem(size);
 300         memcpy(new_dtb, initial_boot_params, size);
 301         early_iounmap(initial_boot_params, map_len);
 302
 303         initial_boot_params = new_dtb;
 304
 305         /* root level address cells */
 306         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 307
 308         unflatten_device_tree();
 309 }
 310 #else
 311 static inline void x86_flattree_get_config(void) { }
 312 #endif
 313
 314 void __init x86_dtb_init(void)
 315 {
 316         x86_flattree_get_config();
 317
 318         if (!of_have_populated_dt())
 319                 return;
 320
 321         dtb_setup_hpet();
 322         dtb_apic_setup();
 323 }
 324
 325 #ifdef CONFIG_X86_IO_APIC
 326
 327 struct of_ioapic_type {
 328         u32 out_type;
 329         u32 trigger;
 330         u32 polarity;
 331 };
 332
 333 static struct of_ioapic_type of_ioapic_type[] =
 334 {
 335         {
 336                 .out_type       = IRQ_TYPE_EDGE_RISING,
 337                 .trigger        = IOAPIC_EDGE,
 338                 .polarity       = 1,
 339         },
 340         {
 341                 .out_type       = IRQ_TYPE_LEVEL_LOW,
 342                 .trigger        = IOAPIC_LEVEL,
 343                 .polarity       = 0,
 344         },
 345         {
 346                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
 347                 .trigger        = IOAPIC_LEVEL,
 348                 .polarity       = 1,
 349         },
 350         {
 351                 .out_type       = IRQ_TYPE_EDGE_FALLING,
 352                 .trigger        = IOAPIC_EDGE,
 353                 .polarity       = 0,
 354         },
 355 };
 356
 357 static int ioapic_xlate(struct irq_domain *id, const u32 *intspec, u32 intsize,
 358                         u32 *out_hwirq, u32 *out_type)
 359 {
 360         struct mp_ioapic_gsi *gsi_cfg;
 361         struct io_apic_irq_attr attr;
 362         struct of_ioapic_type *it;
 363         u32 line, idx, type;
 364
 365         if (intsize < 2)
 366                 return -EINVAL;
 367
 368         line = *intspec;
 369         idx = (u32) id->priv;
 370         gsi_cfg = mp_ioapic_gsi_routing(idx);
 371         *out_hwirq = line + gsi_cfg->gsi_base;
 372
 373         intspec++;
 374         type = *intspec;
 375
 376         if (type >= ARRAY_SIZE(of_ioapic_type))
 377                 return -EINVAL;
 378
 379         it = of_ioapic_type + type;
 380         *out_type = it->out_type;
 381
 382         set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);
 383
 384         return io_apic_setup_irq_pin_once(*out_hwirq, cpu_to_node(0), &attr);
 385 }
 386
 387 static void __init ioapic_add_ofnode(struct device_node *np)
 388 {
 389         struct resource r;
 390         int i, ret;
 391
 392         ret = of_address_to_resource(np, 0, &r);
 393         if (ret) {
 394                 printk(KERN_ERR "Failed to obtain address for %s\n",
 395                                 np->full_name);
 396                 return;
 397         }
 398
 399         for (i = 0; i < nr_ioapics; i++) {
 400                 if (r.start == mpc_ioapic_addr(i)) {
 401                         struct irq_domain *id;
 402
 403                         id = kzalloc(sizeof(*id), GFP_KERNEL);
 404                         BUG_ON(!id);
 405                         id->controller = np;
 406                         id->xlate = ioapic_xlate;
 407                         id->priv = (void *)i;
 408                         add_interrupt_host(id);
 409                         return;
 410                 }
 411         }
 412         printk(KERN_ERR "IOxAPIC at %s is not registered.\n", np->full_name);
 413 }
 414
 415 void __init x86_add_irq_domains(void)
 416 {
 417         struct device_node *dp;
 418
 419         if (!of_have_populated_dt())
 420                 return;
 421
 422         for_each_node_with_property(dp, "interrupt-controller") {
 423                 if (of_device_is_compatible(dp, "intel,ce4100-ioapic"))
 424                         ioapic_add_ofnode(dp);
 425         }
 426 }
 427 #else
 428 void __init x86_add_irq_domains(void) { }
 429 #endif