arch/x86/kernel/devicetree.c

   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_scan_chosen_arch(unsigned long node)
  35 {
  36         BUG();
  37 }
  38
  39 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  40 {
  41         BUG();
  42 }
  43
  44 void __init add_dtb(u64 data)
  45 {
  46         initial_dtb = data + offsetof(struct setup_data, data);
  47 }
  48
  49 /*
  50  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
  51  */
  52 static struct of_device_id __initdata ce4100_ids[] = {
  53         { .compatible = "intel,ce4100-cp", },
  54         { .compatible = "isa", },
  55         { .compatible = "pci", },
  56         {},
  57 };
  58
  59 static int __init add_bus_probe(void)
  60 {
  61         if (!of_have_populated_dt())
  62                 return 0;
  63
  64         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
  65 }
  66 device_initcall(add_bus_probe);
  67
  68 #ifdef CONFIG_PCI
  69 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
  70 {
  71         struct device_node *np;
  72
  73         for_each_node_by_type(np, "pci") {
  74                 const void *prop;
  75                 unsigned int bus_min;
  76
  77                 prop = of_get_property(np, "bus-range", NULL);
  78                 if (!prop)
  79                         continue;
  80                 bus_min = be32_to_cpup(prop);
  81                 if (bus->number == bus_min)
  82                         return np;
  83         }
  84         return NULL;
  85 }
  86
  87 static int x86_of_pci_irq_enable(struct pci_dev *dev)
  88 {
  89         u32 virq;
  90         int ret;
  91         u8 pin;
  92
  93         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  94         if (ret)
  95                 return ret;
  96         if (!pin)
  97                 return 0;
  98
  99         virq = of_irq_parse_and_map_pci(dev, 0, 0);
 100         if (virq == 0)
 101                 return -EINVAL;
 102         dev->irq = virq;
 103         return 0;
 104 }
 105
 106 static void x86_of_pci_irq_disable(struct pci_dev *dev)
 107 {
 108 }
 109
 110 void x86_of_pci_init(void)
 111 {
 112         pcibios_enable_irq = x86_of_pci_irq_enable;
 113         pcibios_disable_irq = x86_of_pci_irq_disable;
 114 }
 115 #endif
 116
 117 static void __init dtb_setup_hpet(void)
 118 {
 119 #ifdef CONFIG_HPET_TIMER
 120         struct device_node *dn;
 121         struct resource r;
 122         int ret;
 123
 124         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
 125         if (!dn)
 126                 return;
 127         ret = of_address_to_resource(dn, 0, &r);
 128         if (ret) {
 129                 WARN_ON(1);
 130                 return;
 131         }
 132         hpet_address = r.start;
 133 #endif
 134 }
 135
 136 #ifdef CONFIG_X86_LOCAL_APIC
 137
 138 static void __init dtb_cpu_setup(void)
 139 {
 140         struct device_node *dn;
 141         u32 apic_id, version;
 142         int ret;
 143
 144         version = GET_APIC_VERSION(apic_read(APIC_LVR));
 145         for_each_of_cpu_node(dn) {
 146                 ret = of_property_read_u32(dn, "reg", &apic_id);
 147                 if (ret < 0) {
 148                         pr_warn("%pOF: missing local APIC ID\n", dn);
 149                         continue;
 150                 }
 151                 generic_processor_info(apic_id, version);
 152         }
 153 }
 154
 155 static void __init dtb_lapic_setup(void)
 156 {
 157         struct device_node *dn;
 158         struct resource r;
 159         unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
 160         int ret;
 161
 162         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
 163         if (dn) {
 164                 ret = of_address_to_resource(dn, 0, &r);
 165                 if (WARN_ON(ret))
 166                         return;
 167                 lapic_addr = r.start;
 168         }
 169
 170         /* Did the boot loader setup the local APIC ? */
 171         if (!boot_cpu_has(X86_FEATURE_APIC)) {
 172                 if (apic_force_enable(lapic_addr))
 173                         return;
 174         }
 175         smp_found_config = 1;
 176         pic_mode = 1;
 177         register_lapic_address(lapic_addr);
 178 }
 179
 180 #endif /* CONFIG_X86_LOCAL_APIC */
 181
 182 #ifdef CONFIG_X86_IO_APIC
 183 static unsigned int ioapic_id;
 184
 185 struct of_ioapic_type {
 186         u32 out_type;
 187         u32 is_level;
 188         u32 active_low;
 189 };
 190
 191 static struct of_ioapic_type of_ioapic_type[] =
 192 {
 193         {
 194                 .out_type       = IRQ_TYPE_EDGE_FALLING,
 195                 .is_level       = 0,
 196                 .active_low     = 1,
 197         },
 198         {
 199                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
 200                 .is_level       = 1,
 201                 .active_low     = 0,
 202         },
 203         {
 204                 .out_type       = IRQ_TYPE_LEVEL_LOW,
 205                 .is_level       = 1,
 206                 .active_low     = 1,
 207         },
 208         {
 209                 .out_type       = IRQ_TYPE_EDGE_RISING,
 210                 .is_level       = 0,
 211                 .active_low     = 0,
 212         },
 213 };
 214
 215 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
 216                               unsigned int nr_irqs, void *arg)
 217 {
 218         struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
 219         struct of_ioapic_type *it;
 220         struct irq_alloc_info tmp;
 221         int type_index;
 222
 223         if (WARN_ON(fwspec->param_count < 2))
 224                 return -EINVAL;
 225
 226         type_index = fwspec->param[1];
 227         if (type_index >= ARRAY_SIZE(of_ioapic_type))
 228                 return -EINVAL;
 229
 230         it = &of_ioapic_type[type_index];
 231         ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->is_level, it->active_low);
 232         tmp.devid = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
 233         tmp.ioapic.pin = fwspec->param[0];
 234
 235         return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
 236 }
 237
 238 static const struct irq_domain_ops ioapic_irq_domain_ops = {
 239         .alloc          = dt_irqdomain_alloc,
 240         .free           = mp_irqdomain_free,
 241         .activate       = mp_irqdomain_activate,
 242         .deactivate     = mp_irqdomain_deactivate,
 243 };
 244
 245 static void __init dtb_add_ioapic(struct device_node *dn)
 246 {
 247         struct resource r;
 248         int ret;
 249         struct ioapic_domain_cfg cfg = {
 250                 .type = IOAPIC_DOMAIN_DYNAMIC,
 251                 .ops = &ioapic_irq_domain_ops,
 252                 .dev = dn,
 253         };
 254
 255         ret = of_address_to_resource(dn, 0, &r);
 256         if (ret) {
 257                 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn);
 258                 return;
 259         }
 260         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
 261 }
 262
 263 static void __init dtb_ioapic_setup(void)
 264 {
 265         struct device_node *dn;
 266
 267         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
 268                 dtb_add_ioapic(dn);
 269
 270         if (nr_ioapics) {
 271                 of_ioapic = 1;
 272                 return;
 273         }
 274         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
 275 }
 276 #else
 277 static void __init dtb_ioapic_setup(void) {}
 278 #endif
 279
 280 static void __init dtb_apic_setup(void)
 281 {
 282 #ifdef CONFIG_X86_LOCAL_APIC
 283         dtb_lapic_setup();
 284         dtb_cpu_setup();
 285 #endif
 286         dtb_ioapic_setup();
 287 }
 288
 289 #ifdef CONFIG_OF_EARLY_FLATTREE
 290 static void __init x86_flattree_get_config(void)
 291 {
 292         u32 size, map_len;
 293         void *dt;
 294
 295         if (!initial_dtb)
 296                 return;
 297
 298         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 299
 300         dt = early_memremap(initial_dtb, map_len);
 301         size = fdt_totalsize(dt);
 302         if (map_len < size) {
 303                 early_memunmap(dt, map_len);
 304                 dt = early_memremap(initial_dtb, size);
 305                 map_len = size;
 306         }
 307
 308         early_init_dt_verify(dt);
 309         unflatten_and_copy_device_tree();
 310         early_memunmap(dt, map_len);
 311 }
 312 #else
 313 static inline void x86_flattree_get_config(void) { }
 314 #endif
 315
 316 void __init x86_dtb_init(void)
 317 {
 318         x86_flattree_get_config();
 319
 320         if (!of_have_populated_dt())
 321                 return;
 322
 323         dtb_setup_hpet();
 324         dtb_apic_setup();
 325 }