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 add_dtb(u64 data)
36 initial_dtb = data + offsetof(struct setup_data, data);
40 * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
42 static struct of_device_id __initdata ce4100_ids[] = {
43 { .compatible = "intel,ce4100-cp", },
44 { .compatible = "isa", },
45 { .compatible = "pci", },
49 static int __init add_bus_probe(void)
51 if (!of_have_populated_dt())
54 return of_platform_bus_probe(NULL, ce4100_ids, NULL);
56 device_initcall(add_bus_probe);
59 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
61 struct device_node *np;
63 for_each_node_by_type(np, "pci") {
67 prop = of_get_property(np, "bus-range", NULL);
70 bus_min = be32_to_cpup(prop);
71 if (bus->number == bus_min)
77 static int x86_of_pci_irq_enable(struct pci_dev *dev)
83 ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
89 virq = of_irq_parse_and_map_pci(dev, 0, 0);
96 static void x86_of_pci_irq_disable(struct pci_dev *dev)
100 void x86_of_pci_init(void)
102 pcibios_enable_irq = x86_of_pci_irq_enable;
103 pcibios_disable_irq = x86_of_pci_irq_disable;
107 static void __init dtb_setup_hpet(void)
109 #ifdef CONFIG_HPET_TIMER
110 struct device_node *dn;
114 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
117 ret = of_address_to_resource(dn, 0, &r);
122 hpet_address = r.start;
126 #ifdef CONFIG_X86_LOCAL_APIC
128 static void __init dtb_cpu_setup(void)
130 struct device_node *dn;
133 for_each_of_cpu_node(dn) {
134 apic_id = of_get_cpu_hwid(dn, 0);
135 if (apic_id == ~0U) {
136 pr_warn("%pOF: missing local APIC ID\n", dn);
139 generic_processor_info(apic_id);
143 static void __init dtb_lapic_setup(void)
145 struct device_node *dn;
147 unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
150 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
152 ret = of_address_to_resource(dn, 0, &r);
155 lapic_addr = r.start;
158 /* Did the boot loader setup the local APIC ? */
159 if (!boot_cpu_has(X86_FEATURE_APIC)) {
160 /* Try force enabling, which registers the APIC address */
161 if (!apic_force_enable(lapic_addr))
164 register_lapic_address(lapic_addr);
166 smp_found_config = 1;
167 pic_mode = !of_property_read_bool(dn, "intel,virtual-wire-mode");
168 pr_info("%s compatibility mode.\n", pic_mode ? "IMCR and PIC" : "Virtual Wire");
171 #endif /* CONFIG_X86_LOCAL_APIC */
173 #ifdef CONFIG_X86_IO_APIC
174 static unsigned int ioapic_id;
176 struct of_ioapic_type {
182 static struct of_ioapic_type of_ioapic_type[] =
185 .out_type = IRQ_TYPE_EDGE_FALLING,
190 .out_type = IRQ_TYPE_LEVEL_HIGH,
195 .out_type = IRQ_TYPE_LEVEL_LOW,
200 .out_type = IRQ_TYPE_EDGE_RISING,
206 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
207 unsigned int nr_irqs, void *arg)
209 struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
210 struct of_ioapic_type *it;
211 struct irq_alloc_info tmp;
214 if (WARN_ON(fwspec->param_count < 2))
217 type_index = fwspec->param[1];
218 if (type_index >= ARRAY_SIZE(of_ioapic_type))
221 it = &of_ioapic_type[type_index];
222 ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->is_level, it->active_low);
223 tmp.devid = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
224 tmp.ioapic.pin = fwspec->param[0];
226 return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
229 static const struct irq_domain_ops ioapic_irq_domain_ops = {
230 .alloc = dt_irqdomain_alloc,
231 .free = mp_irqdomain_free,
232 .activate = mp_irqdomain_activate,
233 .deactivate = mp_irqdomain_deactivate,
236 static void __init dtb_add_ioapic(struct device_node *dn)
240 struct ioapic_domain_cfg cfg = {
241 .type = IOAPIC_DOMAIN_DYNAMIC,
242 .ops = &ioapic_irq_domain_ops,
246 ret = of_address_to_resource(dn, 0, &r);
248 pr_err("Can't obtain address from device node %pOF.\n", dn);
251 mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
254 static void __init dtb_ioapic_setup(void)
256 struct device_node *dn;
258 for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
265 pr_err("Error: No information about IO-APIC in OF.\n");
268 static void __init dtb_ioapic_setup(void) {}
271 static void __init dtb_apic_setup(void)
273 #ifdef CONFIG_X86_LOCAL_APIC
280 #ifdef CONFIG_OF_EARLY_FLATTREE
281 void __init x86_flattree_get_config(void)
289 map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
291 dt = early_memremap(initial_dtb, map_len);
292 size = fdt_totalsize(dt);
293 if (map_len < size) {
294 early_memunmap(dt, map_len);
295 dt = early_memremap(initial_dtb, size);
299 early_init_dt_verify(dt);
300 unflatten_and_copy_device_tree();
301 early_memunmap(dt, map_len);
305 void __init x86_dtb_init(void)
307 if (!of_have_populated_dt())