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