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/numa.h>
  28 #include <asm/prom.h>
  29
  30 __initdata u64 initial_dtb;
  31 char __initdata cmd_line[COMMAND_LINE_SIZE];
  32
  33 int __initdata of_ioapic;
  34
  35 void __init add_dtb(u64 data)
  36 {
  37         initial_dtb = data + offsetof(struct setup_data, data);
  38 }
  39
  40 /*
  41  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
  42  */
  43 static struct of_device_id __initdata ce4100_ids[] = {
  44         { .compatible = "intel,ce4100-cp", },
  45         { .compatible = "isa", },
  46         { .compatible = "pci", },
  47         {},
  48 };
  49
  50 static int __init add_bus_probe(void)
  51 {
  52         if (!of_have_populated_dt())
  53                 return 0;
  54
  55         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
  56 }
  57 device_initcall(add_bus_probe);
  58
  59 #ifdef CONFIG_PCI
  60 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
  61 {
  62         struct device_node *np;
  63
  64         for_each_node_by_type(np, "pci") {
  65                 const void *prop;
  66                 unsigned int bus_min;
  67
  68                 prop = of_get_property(np, "bus-range", NULL);
  69                 if (!prop)
  70                         continue;
  71                 bus_min = be32_to_cpup(prop);
  72                 if (bus->number == bus_min)
  73                         return np;
  74         }
  75         return NULL;
  76 }
  77
  78 static int x86_of_pci_irq_enable(struct pci_dev *dev)
  79 {
  80         u32 virq;
  81         int ret;
  82         u8 pin;
  83
  84         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  85         if (ret)
  86                 return pcibios_err_to_errno(ret);
  87         if (!pin)
  88                 return 0;
  89
  90         virq = of_irq_parse_and_map_pci(dev, 0, 0);
  91         if (virq == 0)
  92                 return -EINVAL;
  93         dev->irq = virq;
  94         return 0;
  95 }
  96
  97 static void x86_of_pci_irq_disable(struct pci_dev *dev)
  98 {
  99 }
 100
 101 void x86_of_pci_init(void)
 102 {
 103         pcibios_enable_irq = x86_of_pci_irq_enable;
 104         pcibios_disable_irq = x86_of_pci_irq_disable;
 105 }
 106 #endif
 107
 108 static void __init dtb_setup_hpet(void)
 109 {
 110 #ifdef CONFIG_HPET_TIMER
 111         struct device_node *dn;
 112         struct resource r;
 113         int ret;
 114
 115         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
 116         if (!dn)
 117                 return;
 118         ret = of_address_to_resource(dn, 0, &r);
 119         if (ret) {
 120                 WARN_ON(1);
 121                 return;
 122         }
 123         hpet_address = r.start;
 124 #endif
 125 }
 126
 127 #ifdef CONFIG_X86_LOCAL_APIC
 128
 129 static void __init dtb_cpu_setup(void)
 130 {
 131         struct device_node *dn;
 132         u32 apic_id;
 133
 134         for_each_of_cpu_node(dn) {
 135                 apic_id = of_get_cpu_hwid(dn, 0);
 136                 if (apic_id == ~0U) {
 137                         pr_warn("%pOF: missing local APIC ID\n", dn);
 138                         continue;
 139                 }
 140                 topology_register_apic(apic_id, CPU_ACPIID_INVALID, true);
 141                 set_apicid_to_node(apic_id, of_node_to_nid(dn));
 142         }
 143 }
 144
 145 static void __init dtb_lapic_setup(void)
 146 {
 147         struct device_node *dn;
 148         struct resource r;
 149         unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
 150         int ret;
 151
 152         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
 153         if (dn) {
 154                 ret = of_address_to_resource(dn, 0, &r);
 155                 if (WARN_ON(ret))
 156                         return;
 157                 lapic_addr = r.start;
 158         }
 159
 160         /* Did the boot loader setup the local APIC ? */
 161         if (!boot_cpu_has(X86_FEATURE_APIC)) {
 162                 /* Try force enabling, which registers the APIC address */
 163                 if (!apic_force_enable(lapic_addr))
 164                         return;
 165         } else {
 166                 register_lapic_address(lapic_addr);
 167         }
 168         smp_found_config = 1;
 169         pic_mode = !of_property_read_bool(dn, "intel,virtual-wire-mode");
 170         pr_info("%s compatibility mode.\n", pic_mode ? "IMCR and PIC" : "Virtual Wire");
 171 }
 172
 173 #endif /* CONFIG_X86_LOCAL_APIC */
 174
 175 #ifdef CONFIG_X86_IO_APIC
 176 static unsigned int ioapic_id;
 177
 178 struct of_ioapic_type {
 179         u32 out_type;
 180         u32 is_level;
 181         u32 active_low;
 182 };
 183
 184 static struct of_ioapic_type of_ioapic_type[] =
 185 {
 186         {
 187                 .out_type       = IRQ_TYPE_EDGE_FALLING,
 188                 .is_level       = 0,
 189                 .active_low     = 1,
 190         },
 191         {
 192                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
 193                 .is_level       = 1,
 194                 .active_low     = 0,
 195         },
 196         {
 197                 .out_type       = IRQ_TYPE_LEVEL_LOW,
 198                 .is_level       = 1,
 199                 .active_low     = 1,
 200         },
 201         {
 202                 .out_type       = IRQ_TYPE_EDGE_RISING,
 203                 .is_level       = 0,
 204                 .active_low     = 0,
 205         },
 206 };
 207
 208 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
 209                               unsigned int nr_irqs, void *arg)
 210 {
 211         struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
 212         struct of_ioapic_type *it;
 213         struct irq_alloc_info tmp;
 214         int type_index;
 215
 216         if (WARN_ON(fwspec->param_count < 2))
 217                 return -EINVAL;
 218
 219         type_index = fwspec->param[1];
 220         if (type_index >= ARRAY_SIZE(of_ioapic_type))
 221                 return -EINVAL;
 222
 223         it = &of_ioapic_type[type_index];
 224         ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->is_level, it->active_low);
 225         tmp.devid = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
 226         tmp.ioapic.pin = fwspec->param[0];
 227
 228         return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
 229 }
 230
 231 static const struct irq_domain_ops ioapic_irq_domain_ops = {
 232         .alloc          = dt_irqdomain_alloc,
 233         .free           = mp_irqdomain_free,
 234         .activate       = mp_irqdomain_activate,
 235         .deactivate     = mp_irqdomain_deactivate,
 236 };
 237
 238 static void __init dtb_add_ioapic(struct device_node *dn)
 239 {
 240         struct resource r;
 241         int ret;
 242         struct ioapic_domain_cfg cfg = {
 243                 .type = IOAPIC_DOMAIN_DYNAMIC,
 244                 .ops = &ioapic_irq_domain_ops,
 245                 .dev = dn,
 246         };
 247
 248         ret = of_address_to_resource(dn, 0, &r);
 249         if (ret) {
 250                 pr_err("Can't obtain address from device node %pOF.\n", dn);
 251                 return;
 252         }
 253         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
 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         pr_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 #ifdef CONFIG_X86_LOCAL_APIC
 276         dtb_lapic_setup();
 277         dtb_cpu_setup();
 278 #endif
 279         dtb_ioapic_setup();
 280 }
 281
 282 static void __init x86_dtb_parse_smp_config(void)
 283 {
 284         if (!of_have_populated_dt())
 285                 return;
 286
 287         dtb_setup_hpet();
 288         dtb_apic_setup();
 289 }
 290
 291 void __init x86_flattree_get_config(void)
 292 {
 293 #ifdef CONFIG_OF_EARLY_FLATTREE
 294         u32 size, map_len;
 295         void *dt;
 296
 297         if (initial_dtb) {
 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, __pa(dt));
 309         }
 310
 311         unflatten_and_copy_device_tree();
 312
 313         if (initial_dtb)
 314                 early_memunmap(dt, map_len);
 315 #endif
 316         if (of_have_populated_dt())
 317                 x86_init.mpparse.parse_smp_cfg = x86_dtb_parse_smp_config;
 318 }