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