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/pci_x86.h>
  24 #include <asm/setup.h>
  25 #include <asm/i8259.h>
  26 #include <asm/prom.h>
  27
  28 __initdata u64 initial_dtb;
  29 char __initdata cmd_line[COMMAND_LINE_SIZE];
  30
  31 int __initdata of_ioapic;
  32
  33 void __init early_init_dt_scan_chosen_arch(unsigned long node)
  34 {
  35         BUG();
  36 }
  37
  38 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  39 {
  40         BUG();
  41 }
  42
  43 void __init add_dtb(u64 data)
  44 {
  45         initial_dtb = data + offsetof(struct setup_data, data);
  46 }
  47
  48 /*
  49  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
  50  */
  51 static struct of_device_id __initdata ce4100_ids[] = {
  52         { .compatible = "intel,ce4100-cp", },
  53         { .compatible = "isa", },
  54         { .compatible = "pci", },
  55         {},
  56 };
  57
  58 static int __init add_bus_probe(void)
  59 {
  60         if (!of_have_populated_dt())
  61                 return 0;
  62
  63         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
  64 }
  65 device_initcall(add_bus_probe);
  66
  67 #ifdef CONFIG_PCI
  68 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
  69 {
  70         struct device_node *np;
  71
  72         for_each_node_by_type(np, "pci") {
  73                 const void *prop;
  74                 unsigned int bus_min;
  75
  76                 prop = of_get_property(np, "bus-range", NULL);
  77                 if (!prop)
  78                         continue;
  79                 bus_min = be32_to_cpup(prop);
  80                 if (bus->number == bus_min)
  81                         return np;
  82         }
  83         return NULL;
  84 }
  85
  86 static int x86_of_pci_irq_enable(struct pci_dev *dev)
  87 {
  88         u32 virq;
  89         int ret;
  90         u8 pin;
  91
  92         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  93         if (ret)
  94                 return ret;
  95         if (!pin)
  96                 return 0;
  97
  98         virq = of_irq_parse_and_map_pci(dev, 0, 0);
  99         if (virq == 0)
 100                 return -EINVAL;
 101         dev->irq = virq;
 102         return 0;
 103 }
 104
 105 static void x86_of_pci_irq_disable(struct pci_dev *dev)
 106 {
 107 }
 108
 109 void x86_of_pci_init(void)
 110 {
 111         pcibios_enable_irq = x86_of_pci_irq_enable;
 112         pcibios_disable_irq = x86_of_pci_irq_disable;
 113 }
 114 #endif
 115
 116 static void __init dtb_setup_hpet(void)
 117 {
 118 #ifdef CONFIG_HPET_TIMER
 119         struct device_node *dn;
 120         struct resource r;
 121         int ret;
 122
 123         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
 124         if (!dn)
 125                 return;
 126         ret = of_address_to_resource(dn, 0, &r);
 127         if (ret) {
 128                 WARN_ON(1);
 129                 return;
 130         }
 131         hpet_address = r.start;
 132 #endif
 133 }
 134
 135 #ifdef CONFIG_X86_LOCAL_APIC
 136
 137 static void __init dtb_cpu_setup(void)
 138 {
 139         struct device_node *dn;
 140         u32 apic_id, version;
 141         int ret;
 142
 143         version = GET_APIC_VERSION(apic_read(APIC_LVR));
 144         for_each_of_cpu_node(dn) {
 145                 ret = of_property_read_u32(dn, "reg", &apic_id);
 146                 if (ret < 0) {
 147                         pr_warn("%pOF: missing local APIC ID\n", dn);
 148                         continue;
 149                 }
 150                 generic_processor_info(apic_id, version);
 151         }
 152 }
 153
 154 static void __init dtb_lapic_setup(void)
 155 {
 156         struct device_node *dn;
 157         struct resource r;
 158         unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
 159         int ret;
 160
 161         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
 162         if (dn) {
 163                 ret = of_address_to_resource(dn, 0, &r);
 164                 if (WARN_ON(ret))
 165                         return;
 166                 lapic_addr = r.start;
 167         }
 168
 169         /* Did the boot loader setup the local APIC ? */
 170         if (!boot_cpu_has(X86_FEATURE_APIC)) {
 171                 if (apic_force_enable(lapic_addr))
 172                         return;
 173         }
 174         smp_found_config = 1;
 175         pic_mode = 1;
 176         register_lapic_address(lapic_addr);
 177 }
 178
 179 #endif /* CONFIG_X86_LOCAL_APIC */
 180
 181 #ifdef CONFIG_X86_IO_APIC
 182 static unsigned int ioapic_id;
 183
 184 struct of_ioapic_type {
 185         u32 out_type;
 186         u32 trigger;
 187         u32 polarity;
 188 };
 189
 190 static struct of_ioapic_type of_ioapic_type[] =
 191 {
 192         {
 193                 .out_type       = IRQ_TYPE_EDGE_RISING,
 194                 .trigger        = IOAPIC_EDGE,
 195                 .polarity       = 1,
 196         },
 197         {
 198                 .out_type       = IRQ_TYPE_LEVEL_LOW,
 199                 .trigger        = IOAPIC_LEVEL,
 200                 .polarity       = 0,
 201         },
 202         {
 203                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
 204                 .trigger        = IOAPIC_LEVEL,
 205                 .polarity       = 1,
 206         },
 207         {
 208                 .out_type       = IRQ_TYPE_EDGE_FALLING,
 209                 .trigger        = IOAPIC_EDGE,
 210                 .polarity       = 0,
 211         },
 212 };
 213
 214 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
 215                               unsigned int nr_irqs, void *arg)
 216 {
 217         struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
 218         struct of_ioapic_type *it;
 219         struct irq_alloc_info tmp;
 220         int type_index;
 221
 222         if (WARN_ON(fwspec->param_count < 2))
 223                 return -EINVAL;
 224
 225         type_index = fwspec->param[1];
 226         if (type_index >= ARRAY_SIZE(of_ioapic_type))
 227                 return -EINVAL;
 228
 229         it = &of_ioapic_type[type_index];
 230         ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
 231         tmp.ioapic_id = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
 232         tmp.ioapic_pin = fwspec->param[0];
 233
 234         return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
 235 }
 236
 237 static const struct irq_domain_ops ioapic_irq_domain_ops = {
 238         .alloc          = dt_irqdomain_alloc,
 239         .free           = mp_irqdomain_free,
 240         .activate       = mp_irqdomain_activate,
 241         .deactivate     = mp_irqdomain_deactivate,
 242 };
 243
 244 static void __init dtb_add_ioapic(struct device_node *dn)
 245 {
 246         struct resource r;
 247         int ret;
 248         struct ioapic_domain_cfg cfg = {
 249                 .type = IOAPIC_DOMAIN_DYNAMIC,
 250                 .ops = &ioapic_irq_domain_ops,
 251                 .dev = dn,
 252         };
 253
 254         ret = of_address_to_resource(dn, 0, &r);
 255         if (ret) {
 256                 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn);
 257                 return;
 258         }
 259         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
 260 }
 261
 262 static void __init dtb_ioapic_setup(void)
 263 {
 264         struct device_node *dn;
 265
 266         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
 267                 dtb_add_ioapic(dn);
 268
 269         if (nr_ioapics) {
 270                 of_ioapic = 1;
 271                 return;
 272         }
 273         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
 274 }
 275 #else
 276 static void __init dtb_ioapic_setup(void) {}
 277 #endif
 278
 279 static void __init dtb_apic_setup(void)
 280 {
 281 #ifdef CONFIG_X86_LOCAL_APIC
 282         dtb_lapic_setup();
 283         dtb_cpu_setup();
 284 #endif
 285         dtb_ioapic_setup();
 286 }
 287
 288 #ifdef CONFIG_OF_EARLY_FLATTREE
 289 static void __init x86_flattree_get_config(void)
 290 {
 291         u32 size, map_len;
 292         void *dt;
 293
 294         if (!initial_dtb)
 295                 return;
 296
 297         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 298
 299         dt = early_memremap(initial_dtb, map_len);
 300         size = fdt_totalsize(dt);
 301         if (map_len < size) {
 302                 early_memunmap(dt, map_len);
 303                 dt = early_memremap(initial_dtb, size);
 304                 map_len = size;
 305         }
 306
 307         early_init_dt_verify(dt);
 308         unflatten_and_copy_device_tree();
 309         early_memunmap(dt, map_len);
 310 }
 311 #else
 312 static inline void x86_flattree_get_config(void) { }
 313 #endif
 314
 315 void __init x86_dtb_init(void)
 316 {
 317         x86_flattree_get_config();
 318
 319         if (!of_have_populated_dt())
 320                 return;
 321
 322         dtb_setup_hpet();
 323         dtb_apic_setup();
 324 }