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/pci_x86.h>
24 #include <asm/setup.h>
25 #include <asm/i8259.h>
28 __initdata u64 initial_dtb;
29 char __initdata cmd_line[COMMAND_LINE_SIZE];
31 int __initdata of_ioapic;
33 void __init early_init_dt_scan_chosen_arch(unsigned long node)
38 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
43 void __init add_dtb(u64 data)
45 initial_dtb = data + offsetof(struct setup_data, data);
49 * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
51 static struct of_device_id __initdata ce4100_ids[] = {
52 { .compatible = "intel,ce4100-cp", },
53 { .compatible = "isa", },
54 { .compatible = "pci", },
58 static int __init add_bus_probe(void)
60 if (!of_have_populated_dt())
63 return of_platform_bus_probe(NULL, ce4100_ids, NULL);
65 device_initcall(add_bus_probe);
68 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
70 struct device_node *np;
72 for_each_node_by_type(np, "pci") {
76 prop = of_get_property(np, "bus-range", NULL);
79 bus_min = be32_to_cpup(prop);
80 if (bus->number == bus_min)
86 static int x86_of_pci_irq_enable(struct pci_dev *dev)
92 ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
98 virq = of_irq_parse_and_map_pci(dev, 0, 0);
105 static void x86_of_pci_irq_disable(struct pci_dev *dev)
109 void x86_of_pci_init(void)
111 pcibios_enable_irq = x86_of_pci_irq_enable;
112 pcibios_disable_irq = x86_of_pci_irq_disable;
116 static void __init dtb_setup_hpet(void)
118 #ifdef CONFIG_HPET_TIMER
119 struct device_node *dn;
123 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
126 ret = of_address_to_resource(dn, 0, &r);
131 hpet_address = r.start;
135 #ifdef CONFIG_X86_LOCAL_APIC
137 static void __init dtb_cpu_setup(void)
139 struct device_node *dn;
140 u32 apic_id, version;
143 version = GET_APIC_VERSION(apic_read(APIC_LVR));
144 for_each_of_cpu_node(dn) {
145 ret = of_property_read_u32(dn, "reg", &apic_id);
147 pr_warn("%pOF: missing local APIC ID\n", dn);
150 generic_processor_info(apic_id, version);
154 static void __init dtb_lapic_setup(void)
156 struct device_node *dn;
158 unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
161 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
163 ret = of_address_to_resource(dn, 0, &r);
166 lapic_addr = r.start;
169 /* Did the boot loader setup the local APIC ? */
170 if (!boot_cpu_has(X86_FEATURE_APIC)) {
171 if (apic_force_enable(lapic_addr))
174 smp_found_config = 1;
176 register_lapic_address(lapic_addr);
179 #endif /* CONFIG_X86_LOCAL_APIC */
181 #ifdef CONFIG_X86_IO_APIC
182 static unsigned int ioapic_id;
184 struct of_ioapic_type {
190 static struct of_ioapic_type of_ioapic_type[] =
193 .out_type = IRQ_TYPE_EDGE_RISING,
194 .trigger = IOAPIC_EDGE,
198 .out_type = IRQ_TYPE_LEVEL_LOW,
199 .trigger = IOAPIC_LEVEL,
203 .out_type = IRQ_TYPE_LEVEL_HIGH,
204 .trigger = IOAPIC_LEVEL,
208 .out_type = IRQ_TYPE_EDGE_FALLING,
209 .trigger = IOAPIC_EDGE,
214 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
215 unsigned int nr_irqs, void *arg)
217 struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
218 struct of_ioapic_type *it;
219 struct irq_alloc_info tmp;
222 if (WARN_ON(fwspec->param_count < 2))
225 type_index = fwspec->param[1];
226 if (type_index >= ARRAY_SIZE(of_ioapic_type))
229 it = &of_ioapic_type[type_index];
230 ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
231 tmp.ioapic_id = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
232 tmp.ioapic_pin = fwspec->param[0];
234 return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
237 static const struct irq_domain_ops ioapic_irq_domain_ops = {
238 .alloc = dt_irqdomain_alloc,
239 .free = mp_irqdomain_free,
240 .activate = mp_irqdomain_activate,
241 .deactivate = mp_irqdomain_deactivate,
244 static void __init dtb_add_ioapic(struct device_node *dn)
248 struct ioapic_domain_cfg cfg = {
249 .type = IOAPIC_DOMAIN_DYNAMIC,
250 .ops = &ioapic_irq_domain_ops,
254 ret = of_address_to_resource(dn, 0, &r);
256 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn);
259 mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
262 static void __init dtb_ioapic_setup(void)
264 struct device_node *dn;
266 for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
273 printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
276 static void __init dtb_ioapic_setup(void) {}
279 static void __init dtb_apic_setup(void)
281 #ifdef CONFIG_X86_LOCAL_APIC
288 #ifdef CONFIG_OF_EARLY_FLATTREE
289 static void __init x86_flattree_get_config(void)
297 map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
299 dt = early_memremap(initial_dtb, map_len);
300 size = fdt_totalsize(dt);
301 if (map_len < size) {
302 early_memunmap(dt, map_len);
303 dt = early_memremap(initial_dtb, size);
307 early_init_dt_verify(dt);
308 unflatten_and_copy_device_tree();
309 early_memunmap(dt, map_len);
312 static inline void x86_flattree_get_config(void) { }
315 void __init x86_dtb_init(void)
317 x86_flattree_get_config();
319 if (!of_have_populated_dt())