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/slab.h>
15 #include <linux/pci.h>
16 #include <linux/of_pci.h>
17 #include <linux/initrd.h>
19 #include <asm/irqdomain.h>
22 #include <asm/pci_x86.h>
23 #include <asm/setup.h>
24 #include <asm/i8259.h>
26 __initdata u64 initial_dtb;
27 char __initdata cmd_line[COMMAND_LINE_SIZE];
29 int __initdata of_ioapic;
31 void __init early_init_dt_scan_chosen_arch(unsigned long node)
36 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
41 void __init add_dtb(u64 data)
43 initial_dtb = data + offsetof(struct setup_data, data);
47 * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
49 static struct of_device_id __initdata ce4100_ids[] = {
50 { .compatible = "intel,ce4100-cp", },
51 { .compatible = "isa", },
52 { .compatible = "pci", },
56 static int __init add_bus_probe(void)
58 if (!of_have_populated_dt())
61 return of_platform_bus_probe(NULL, ce4100_ids, NULL);
63 device_initcall(add_bus_probe);
66 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
68 struct device_node *np;
70 for_each_node_by_type(np, "pci") {
74 prop = of_get_property(np, "bus-range", NULL);
77 bus_min = be32_to_cpup(prop);
78 if (bus->number == bus_min)
84 static int x86_of_pci_irq_enable(struct pci_dev *dev)
90 ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
96 virq = of_irq_parse_and_map_pci(dev, 0, 0);
103 static void x86_of_pci_irq_disable(struct pci_dev *dev)
107 void x86_of_pci_init(void)
109 pcibios_enable_irq = x86_of_pci_irq_enable;
110 pcibios_disable_irq = x86_of_pci_irq_disable;
114 static void __init dtb_setup_hpet(void)
116 #ifdef CONFIG_HPET_TIMER
117 struct device_node *dn;
121 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
124 ret = of_address_to_resource(dn, 0, &r);
129 hpet_address = r.start;
133 static void __init dtb_lapic_setup(void)
135 #ifdef CONFIG_X86_LOCAL_APIC
136 struct device_node *dn;
140 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
144 ret = of_address_to_resource(dn, 0, &r);
148 /* Did the boot loader setup the local APIC ? */
149 if (!boot_cpu_has(X86_FEATURE_APIC)) {
150 if (apic_force_enable(r.start))
153 smp_found_config = 1;
155 register_lapic_address(r.start);
156 generic_processor_info(boot_cpu_physical_apicid,
157 GET_APIC_VERSION(apic_read(APIC_LVR)));
161 #ifdef CONFIG_X86_IO_APIC
162 static unsigned int ioapic_id;
164 struct of_ioapic_type {
170 static struct of_ioapic_type of_ioapic_type[] =
173 .out_type = IRQ_TYPE_EDGE_RISING,
174 .trigger = IOAPIC_EDGE,
178 .out_type = IRQ_TYPE_LEVEL_LOW,
179 .trigger = IOAPIC_LEVEL,
183 .out_type = IRQ_TYPE_LEVEL_HIGH,
184 .trigger = IOAPIC_LEVEL,
188 .out_type = IRQ_TYPE_EDGE_FALLING,
189 .trigger = IOAPIC_EDGE,
194 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
195 unsigned int nr_irqs, void *arg)
197 struct of_phandle_args *irq_data = (void *)arg;
198 struct of_ioapic_type *it;
199 struct irq_alloc_info tmp;
201 if (WARN_ON(irq_data->args_count < 2))
203 if (irq_data->args[1] >= ARRAY_SIZE(of_ioapic_type))
206 it = &of_ioapic_type[irq_data->args[1]];
207 ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
208 tmp.ioapic_id = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
209 tmp.ioapic_pin = irq_data->args[0];
211 return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
214 static const struct irq_domain_ops ioapic_irq_domain_ops = {
215 .alloc = dt_irqdomain_alloc,
216 .free = mp_irqdomain_free,
217 .activate = mp_irqdomain_activate,
218 .deactivate = mp_irqdomain_deactivate,
221 static void __init dtb_add_ioapic(struct device_node *dn)
225 struct ioapic_domain_cfg cfg = {
226 .type = IOAPIC_DOMAIN_DYNAMIC,
227 .ops = &ioapic_irq_domain_ops,
231 ret = of_address_to_resource(dn, 0, &r);
233 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn);
236 mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
239 static void __init dtb_ioapic_setup(void)
241 struct device_node *dn;
243 for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
250 printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
253 static void __init dtb_ioapic_setup(void) {}
256 static void __init dtb_apic_setup(void)
262 #ifdef CONFIG_OF_FLATTREE
263 static void __init x86_flattree_get_config(void)
271 map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
273 initial_boot_params = dt = early_memremap(initial_dtb, map_len);
274 size = of_get_flat_dt_size();
275 if (map_len < size) {
276 early_memunmap(dt, map_len);
277 initial_boot_params = dt = early_memremap(initial_dtb, size);
281 unflatten_and_copy_device_tree();
282 early_memunmap(dt, map_len);
285 static inline void x86_flattree_get_config(void) { }
288 void __init x86_dtb_init(void)
290 x86_flattree_get_config();
292 if (!of_have_populated_dt())