1 // SPDX-License-Identifier: GPL-2.0
3 * Architecture specific OF callbacks.
5 #include <linux/export.h>
7 #include <linux/interrupt.h>
8 #include <linux/list.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>
20 #include <asm/irqdomain.h>
23 #include <asm/io_apic.h>
24 #include <asm/pci_x86.h>
25 #include <asm/setup.h>
26 #include <asm/i8259.h>
29 __initdata u64 initial_dtb;
30 char __initdata cmd_line[COMMAND_LINE_SIZE];
32 int __initdata of_ioapic;
34 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
39 void __init add_dtb(u64 data)
41 initial_dtb = data + offsetof(struct setup_data, data);
45 * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
47 static struct of_device_id __initdata ce4100_ids[] = {
48 { .compatible = "intel,ce4100-cp", },
49 { .compatible = "isa", },
50 { .compatible = "pci", },
54 static int __init add_bus_probe(void)
56 if (!of_have_populated_dt())
59 return of_platform_bus_probe(NULL, ce4100_ids, NULL);
61 device_initcall(add_bus_probe);
64 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
66 struct device_node *np;
68 for_each_node_by_type(np, "pci") {
72 prop = of_get_property(np, "bus-range", NULL);
75 bus_min = be32_to_cpup(prop);
76 if (bus->number == bus_min)
82 static int x86_of_pci_irq_enable(struct pci_dev *dev)
88 ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
94 virq = of_irq_parse_and_map_pci(dev, 0, 0);
101 static void x86_of_pci_irq_disable(struct pci_dev *dev)
105 void x86_of_pci_init(void)
107 pcibios_enable_irq = x86_of_pci_irq_enable;
108 pcibios_disable_irq = x86_of_pci_irq_disable;
112 static void __init dtb_setup_hpet(void)
114 #ifdef CONFIG_HPET_TIMER
115 struct device_node *dn;
119 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
122 ret = of_address_to_resource(dn, 0, &r);
127 hpet_address = r.start;
131 #ifdef CONFIG_X86_LOCAL_APIC
133 static void __init dtb_cpu_setup(void)
135 struct device_node *dn;
136 u32 apic_id, version;
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);
145 generic_processor_info(apic_id, version);
149 static void __init dtb_lapic_setup(void)
151 struct device_node *dn;
153 unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
156 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
158 ret = of_address_to_resource(dn, 0, &r);
161 lapic_addr = r.start;
164 /* Did the boot loader setup the local APIC ? */
165 if (!boot_cpu_has(X86_FEATURE_APIC)) {
166 if (apic_force_enable(lapic_addr))
169 smp_found_config = 1;
171 register_lapic_address(lapic_addr);
174 #endif /* CONFIG_X86_LOCAL_APIC */
176 #ifdef CONFIG_X86_IO_APIC
177 static unsigned int ioapic_id;
179 struct of_ioapic_type {
185 static struct of_ioapic_type of_ioapic_type[] =
188 .out_type = IRQ_TYPE_EDGE_FALLING,
193 .out_type = IRQ_TYPE_LEVEL_HIGH,
198 .out_type = IRQ_TYPE_LEVEL_LOW,
203 .out_type = IRQ_TYPE_EDGE_RISING,
209 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
210 unsigned int nr_irqs, void *arg)
212 struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
213 struct of_ioapic_type *it;
214 struct irq_alloc_info tmp;
217 if (WARN_ON(fwspec->param_count < 2))
220 type_index = fwspec->param[1];
221 if (type_index >= ARRAY_SIZE(of_ioapic_type))
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];
229 return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
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,
239 static void __init dtb_add_ioapic(struct device_node *dn)
243 struct ioapic_domain_cfg cfg = {
244 .type = IOAPIC_DOMAIN_DYNAMIC,
245 .ops = &ioapic_irq_domain_ops,
249 ret = of_address_to_resource(dn, 0, &r);
251 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn);
254 mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
257 static void __init dtb_ioapic_setup(void)
259 struct device_node *dn;
261 for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
268 printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
271 static void __init dtb_ioapic_setup(void) {}
274 static void __init dtb_apic_setup(void)
276 #ifdef CONFIG_X86_LOCAL_APIC
283 #ifdef CONFIG_OF_EARLY_FLATTREE
284 static void __init x86_flattree_get_config(void)
292 map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
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);
302 early_init_dt_verify(dt);
303 unflatten_and_copy_device_tree();
304 early_memunmap(dt, map_len);
307 static inline void x86_flattree_get_config(void) { }
310 void __init x86_dtb_init(void)
312 x86_flattree_get_config();
314 if (!of_have_populated_dt())