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