arch/x86/kernel/devicetree.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Architecture specific OF callbacks.
   4  */
   5 #include <linux/bootmem.h>
   6 #include <linux/export.h>
   7 #include <linux/io.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/list.h>
  10 #include <linux/of.h>
  11 #include <linux/of_fdt.h>
  12 #include <linux/of_address.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/libfdt.h>
  16 #include <linux/slab.h>
  17 #include <linux/pci.h>
  18 #include <linux/of_pci.h>
  19 #include <linux/initrd.h>
  20
  21 #include <asm/irqdomain.h>
  22 #include <asm/hpet.h>
  23 #include <asm/apic.h>
  24 #include <asm/pci_x86.h>
  25 #include <asm/setup.h>
  26 #include <asm/i8259.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 early_init_dt_alloc_memory_arch(u64 size, u64 align)
  44 {
  45         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
  46 }
  47
  48 void __init add_dtb(u64 data)
  49 {
  50         initial_dtb = data + offsetof(struct setup_data, data);
  51 }
  52
  53 /*
  54  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
  55  */
  56 static struct of_device_id __initdata ce4100_ids[] = {
  57         { .compatible = "intel,ce4100-cp", },
  58         { .compatible = "isa", },
  59         { .compatible = "pci", },
  60         {},
  61 };
  62
  63 static int __init add_bus_probe(void)
  64 {
  65         if (!of_have_populated_dt())
  66                 return 0;
  67
  68         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
  69 }
  70 device_initcall(add_bus_probe);
  71
  72 #ifdef CONFIG_PCI
  73 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
  74 {
  75         struct device_node *np;
  76
  77         for_each_node_by_type(np, "pci") {
  78                 const void *prop;
  79                 unsigned int bus_min;
  80
  81                 prop = of_get_property(np, "bus-range", NULL);
  82                 if (!prop)
  83                         continue;
  84                 bus_min = be32_to_cpup(prop);
  85                 if (bus->number == bus_min)
  86                         return np;
  87         }
  88         return NULL;
  89 }
  90
  91 static int x86_of_pci_irq_enable(struct pci_dev *dev)
  92 {
  93         u32 virq;
  94         int ret;
  95         u8 pin;
  96
  97         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  98         if (ret)
  99                 return ret;
 100         if (!pin)
 101                 return 0;
 102
 103         virq = of_irq_parse_and_map_pci(dev, 0, 0);
 104         if (virq == 0)
 105                 return -EINVAL;
 106         dev->irq = virq;
 107         return 0;
 108 }
 109
 110 static void x86_of_pci_irq_disable(struct pci_dev *dev)
 111 {
 112 }
 113
 114 void x86_of_pci_init(void)
 115 {
 116         pcibios_enable_irq = x86_of_pci_irq_enable;
 117         pcibios_disable_irq = x86_of_pci_irq_disable;
 118 }
 119 #endif
 120
 121 static void __init dtb_setup_hpet(void)
 122 {
 123 #ifdef CONFIG_HPET_TIMER
 124         struct device_node *dn;
 125         struct resource r;
 126         int ret;
 127
 128         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
 129         if (!dn)
 130                 return;
 131         ret = of_address_to_resource(dn, 0, &r);
 132         if (ret) {
 133                 WARN_ON(1);
 134                 return;
 135         }
 136         hpet_address = r.start;
 137 #endif
 138 }
 139
 140 static void __init dtb_lapic_setup(void)
 141 {
 142 #ifdef CONFIG_X86_LOCAL_APIC
 143         struct device_node *dn;
 144         struct resource r;
 145         int ret;
 146
 147         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
 148         if (!dn)
 149                 return;
 150
 151         ret = of_address_to_resource(dn, 0, &r);
 152         if (WARN_ON(ret))
 153                 return;
 154
 155         /* Did the boot loader setup the local APIC ? */
 156         if (!boot_cpu_has(X86_FEATURE_APIC)) {
 157                 if (apic_force_enable(r.start))
 158                         return;
 159         }
 160         smp_found_config = 1;
 161         pic_mode = 1;
 162         register_lapic_address(r.start);
 163         generic_processor_info(boot_cpu_physical_apicid,
 164                                GET_APIC_VERSION(apic_read(APIC_LVR)));
 165 #endif
 166 }
 167
 168 #ifdef CONFIG_X86_IO_APIC
 169 static unsigned int ioapic_id;
 170
 171 struct of_ioapic_type {
 172         u32 out_type;
 173         u32 trigger;
 174         u32 polarity;
 175 };
 176
 177 static struct of_ioapic_type of_ioapic_type[] =
 178 {
 179         {
 180                 .out_type       = IRQ_TYPE_EDGE_RISING,
 181                 .trigger        = IOAPIC_EDGE,
 182                 .polarity       = 1,
 183         },
 184         {
 185                 .out_type       = IRQ_TYPE_LEVEL_LOW,
 186                 .trigger        = IOAPIC_LEVEL,
 187                 .polarity       = 0,
 188         },
 189         {
 190                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
 191                 .trigger        = IOAPIC_LEVEL,
 192                 .polarity       = 1,
 193         },
 194         {
 195                 .out_type       = IRQ_TYPE_EDGE_FALLING,
 196                 .trigger        = IOAPIC_EDGE,
 197                 .polarity       = 0,
 198         },
 199 };
 200
 201 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
 202                               unsigned int nr_irqs, void *arg)
 203 {
 204         struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
 205         struct of_ioapic_type *it;
 206         struct irq_alloc_info tmp;
 207         int type_index;
 208
 209         if (WARN_ON(fwspec->param_count < 2))
 210                 return -EINVAL;
 211
 212         type_index = fwspec->param[1];
 213         if (type_index >= ARRAY_SIZE(of_ioapic_type))
 214                 return -EINVAL;
 215
 216         it = &of_ioapic_type[type_index];
 217         ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
 218         tmp.ioapic_id = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
 219         tmp.ioapic_pin = fwspec->param[0];
 220
 221         return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
 222 }
 223
 224 static const struct irq_domain_ops ioapic_irq_domain_ops = {
 225         .alloc          = dt_irqdomain_alloc,
 226         .free           = mp_irqdomain_free,
 227         .activate       = mp_irqdomain_activate,
 228         .deactivate     = mp_irqdomain_deactivate,
 229 };
 230
 231 static void __init dtb_add_ioapic(struct device_node *dn)
 232 {
 233         struct resource r;
 234         int ret;
 235         struct ioapic_domain_cfg cfg = {
 236                 .type = IOAPIC_DOMAIN_DYNAMIC,
 237                 .ops = &ioapic_irq_domain_ops,
 238                 .dev = dn,
 239         };
 240
 241         ret = of_address_to_resource(dn, 0, &r);
 242         if (ret) {
 243                 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn);
 244                 return;
 245         }
 246         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
 247 }
 248
 249 static void __init dtb_ioapic_setup(void)
 250 {
 251         struct device_node *dn;
 252
 253         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
 254                 dtb_add_ioapic(dn);
 255
 256         if (nr_ioapics) {
 257                 of_ioapic = 1;
 258                 return;
 259         }
 260         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
 261 }
 262 #else
 263 static void __init dtb_ioapic_setup(void) {}
 264 #endif
 265
 266 static void __init dtb_apic_setup(void)
 267 {
 268         dtb_lapic_setup();
 269         dtb_ioapic_setup();
 270 }
 271
 272 #ifdef CONFIG_OF_FLATTREE
 273 static void __init x86_flattree_get_config(void)
 274 {
 275         u32 size, map_len;
 276         void *dt;
 277
 278         if (!initial_dtb)
 279                 return;
 280
 281         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 282
 283         dt = early_memremap(initial_dtb, map_len);
 284         size = fdt_totalsize(dt);
 285         if (map_len < size) {
 286                 early_memunmap(dt, map_len);
 287                 dt = early_memremap(initial_dtb, size);
 288                 map_len = size;
 289         }
 290
 291         early_init_dt_verify(dt);
 292         unflatten_and_copy_device_tree();
 293         early_memunmap(dt, map_len);
 294 }
 295 #else
 296 static inline void x86_flattree_get_config(void) { }
 297 #endif
 298
 299 void __init x86_dtb_init(void)
 300 {
 301         x86_flattree_get_config();
 302
 303         if (!of_have_populated_dt())
 304                 return;
 305
 306         dtb_setup_hpet();
 307         dtb_apic_setup();
 308 }