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 add_dtb(u64 data)
  35 {
  36         initial_dtb = data + offsetof(struct setup_data, data);
  37 }
  38
  39 /*
  40  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
  41  */
  42 static struct of_device_id __initdata ce4100_ids[] = {
  43         { .compatible = "intel,ce4100-cp", },
  44         { .compatible = "isa", },
  45         { .compatible = "pci", },
  46         {},
  47 };
  48
  49 static int __init add_bus_probe(void)
  50 {
  51         if (!of_have_populated_dt())
  52                 return 0;
  53
  54         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
  55 }
  56 device_initcall(add_bus_probe);
  57
  58 #ifdef CONFIG_PCI
  59 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
  60 {
  61         struct device_node *np;
  62
  63         for_each_node_by_type(np, "pci") {
  64                 const void *prop;
  65                 unsigned int bus_min;
  66
  67                 prop = of_get_property(np, "bus-range", NULL);
  68                 if (!prop)
  69                         continue;
  70                 bus_min = be32_to_cpup(prop);
  71                 if (bus->number == bus_min)
  72                         return np;
  73         }
  74         return NULL;
  75 }
  76
  77 static int x86_of_pci_irq_enable(struct pci_dev *dev)
  78 {
  79         u32 virq;
  80         int ret;
  81         u8 pin;
  82
  83         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  84         if (ret)
  85                 return ret;
  86         if (!pin)
  87                 return 0;
  88
  89         virq = of_irq_parse_and_map_pci(dev, 0, 0);
  90         if (virq == 0)
  91                 return -EINVAL;
  92         dev->irq = virq;
  93         return 0;
  94 }
  95
  96 static void x86_of_pci_irq_disable(struct pci_dev *dev)
  97 {
  98 }
  99
 100 void x86_of_pci_init(void)
 101 {
 102         pcibios_enable_irq = x86_of_pci_irq_enable;
 103         pcibios_disable_irq = x86_of_pci_irq_disable;
 104 }
 105 #endif
 106
 107 static void __init dtb_setup_hpet(void)
 108 {
 109 #ifdef CONFIG_HPET_TIMER
 110         struct device_node *dn;
 111         struct resource r;
 112         int ret;
 113
 114         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
 115         if (!dn)
 116                 return;
 117         ret = of_address_to_resource(dn, 0, &r);
 118         if (ret) {
 119                 WARN_ON(1);
 120                 return;
 121         }
 122         hpet_address = r.start;
 123 #endif
 124 }
 125
 126 #ifdef CONFIG_X86_LOCAL_APIC
 127
 128 static void __init dtb_cpu_setup(void)
 129 {
 130         struct device_node *dn;
 131         u32 apic_id;
 132
 133         for_each_of_cpu_node(dn) {
 134                 apic_id = of_get_cpu_hwid(dn, 0);
 135                 if (apic_id == ~0U) {
 136                         pr_warn("%pOF: missing local APIC ID\n", dn);
 137                         continue;
 138                 }
 139                 topology_register_apic(apic_id, CPU_ACPIID_INVALID, true);
 140         }
 141 }
 142
 143 static void __init dtb_lapic_setup(void)
 144 {
 145         struct device_node *dn;
 146         struct resource r;
 147         unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
 148         int ret;
 149
 150         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
 151         if (dn) {
 152                 ret = of_address_to_resource(dn, 0, &r);
 153                 if (WARN_ON(ret))
 154                         return;
 155                 lapic_addr = r.start;
 156         }
 157
 158         /* Did the boot loader setup the local APIC ? */
 159         if (!boot_cpu_has(X86_FEATURE_APIC)) {
 160                 /* Try force enabling, which registers the APIC address */
 161                 if (!apic_force_enable(lapic_addr))
 162                         return;
 163         } else {
 164                 register_lapic_address(lapic_addr);
 165         }
 166         smp_found_config = 1;
 167         pic_mode = !of_property_read_bool(dn, "intel,virtual-wire-mode");
 168         pr_info("%s compatibility mode.\n", pic_mode ? "IMCR and PIC" : "Virtual Wire");
 169 }
 170
 171 #endif /* CONFIG_X86_LOCAL_APIC */
 172
 173 #ifdef CONFIG_X86_IO_APIC
 174 static unsigned int ioapic_id;
 175
 176 struct of_ioapic_type {
 177         u32 out_type;
 178         u32 is_level;
 179         u32 active_low;
 180 };
 181
 182 static struct of_ioapic_type of_ioapic_type[] =
 183 {
 184         {
 185                 .out_type       = IRQ_TYPE_EDGE_FALLING,
 186                 .is_level       = 0,
 187                 .active_low     = 1,
 188         },
 189         {
 190                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
 191                 .is_level       = 1,
 192                 .active_low     = 0,
 193         },
 194         {
 195                 .out_type       = IRQ_TYPE_LEVEL_LOW,
 196                 .is_level       = 1,
 197                 .active_low     = 1,
 198         },
 199         {
 200                 .out_type       = IRQ_TYPE_EDGE_RISING,
 201                 .is_level       = 0,
 202                 .active_low     = 0,
 203         },
 204 };
 205
 206 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
 207                               unsigned int nr_irqs, void *arg)
 208 {
 209         struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
 210         struct of_ioapic_type *it;
 211         struct irq_alloc_info tmp;
 212         int type_index;
 213
 214         if (WARN_ON(fwspec->param_count < 2))
 215                 return -EINVAL;
 216
 217         type_index = fwspec->param[1];
 218         if (type_index >= ARRAY_SIZE(of_ioapic_type))
 219                 return -EINVAL;
 220
 221         it = &of_ioapic_type[type_index];
 222         ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->is_level, it->active_low);
 223         tmp.devid = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
 224         tmp.ioapic.pin = fwspec->param[0];
 225
 226         return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
 227 }
 228
 229 static const struct irq_domain_ops ioapic_irq_domain_ops = {
 230         .alloc          = dt_irqdomain_alloc,
 231         .free           = mp_irqdomain_free,
 232         .activate       = mp_irqdomain_activate,
 233         .deactivate     = mp_irqdomain_deactivate,
 234 };
 235
 236 static void __init dtb_add_ioapic(struct device_node *dn)
 237 {
 238         struct resource r;
 239         int ret;
 240         struct ioapic_domain_cfg cfg = {
 241                 .type = IOAPIC_DOMAIN_DYNAMIC,
 242                 .ops = &ioapic_irq_domain_ops,
 243                 .dev = dn,
 244         };
 245
 246         ret = of_address_to_resource(dn, 0, &r);
 247         if (ret) {
 248                 pr_err("Can't obtain address from device node %pOF.\n", dn);
 249                 return;
 250         }
 251         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
 252 }
 253
 254 static void __init dtb_ioapic_setup(void)
 255 {
 256         struct device_node *dn;
 257
 258         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
 259                 dtb_add_ioapic(dn);
 260
 261         if (nr_ioapics) {
 262                 of_ioapic = 1;
 263                 return;
 264         }
 265         pr_err("Error: No information about IO-APIC in OF.\n");
 266 }
 267 #else
 268 static void __init dtb_ioapic_setup(void) {}
 269 #endif
 270
 271 static void __init dtb_apic_setup(void)
 272 {
 273 #ifdef CONFIG_X86_LOCAL_APIC
 274         dtb_lapic_setup();
 275         dtb_cpu_setup();
 276 #endif
 277         dtb_ioapic_setup();
 278 }
 279
 280 #ifdef CONFIG_OF_EARLY_FLATTREE
 281 void __init x86_flattree_get_config(void)
 282 {
 283         u32 size, map_len;
 284         void *dt;
 285
 286         if (initial_dtb) {
 287                 map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 288
 289                 dt = early_memremap(initial_dtb, map_len);
 290                 size = fdt_totalsize(dt);
 291                 if (map_len < size) {
 292                         early_memunmap(dt, map_len);
 293                         dt = early_memremap(initial_dtb, size);
 294                         map_len = size;
 295                 }
 296
 297                 early_init_dt_verify(dt);
 298         }
 299
 300         unflatten_and_copy_device_tree();
 301
 302         if (initial_dtb)
 303                 early_memunmap(dt, map_len);
 304 }
 305 #endif
 306
 307 void __init x86_dtb_parse_smp_config(void)
 308 {
 309         if (!of_have_populated_dt())
 310                 return;
 311
 312         dtb_setup_hpet();
 313         dtb_apic_setup();
 314 }