1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Architecture specific OF callbacks.
4 */
5 #include <linux/export.h>
6 #include <linux/io.h>
7 #include <linux/interrupt.h>
8 #include <linux/list.h>
9 #include <linux/of.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>
19
20 #include <asm/irqdomain.h>
21 #include <asm/hpet.h>
22 #include <asm/apic.h>
23 #include <asm/io_apic.h>
24 #include <asm/pci_x86.h>
25 #include <asm/setup.h>
26 #include <asm/i8259.h>
27 #include <asm/prom.h>
28
29 __initdata u64 initial_dtb;
30 char __initdata cmd_line[COMMAND_LINE_SIZE];
31
32 int __initdata of_ioapic;
33
add_dtb(u64 data)34 void __init add_dtb(u64 data)
35 {
36 initial_dtb = data + offsetof(struct setup_data, data);
37 }
38
39 /*
40 * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
41 */
42 static struct of_device_id __initdata ce4100_ids[] = {
43 { .compatible = "intel,ce4100-cp", },
44 { .compatible = "isa", },
45 { .compatible = "pci", },
46 {},
47 };
48
add_bus_probe(void)49 static int __init add_bus_probe(void)
50 {
51 if (!of_have_populated_dt())
52 return 0;
53
54 return of_platform_bus_probe(NULL, ce4100_ids, NULL);
55 }
56 device_initcall(add_bus_probe);
57
58 #ifdef CONFIG_PCI
pcibios_get_phb_of_node(struct pci_bus * bus)59 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
60 {
61 struct device_node *np;
62
63 for_each_node_by_type(np, "pci") {
64 const void *prop;
65 unsigned int bus_min;
66
67 prop = of_get_property(np, "bus-range", NULL);
68 if (!prop)
69 continue;
70 bus_min = be32_to_cpup(prop);
71 if (bus->number == bus_min)
72 return np;
73 }
74 return NULL;
75 }
76
x86_of_pci_irq_enable(struct pci_dev * dev)77 static int x86_of_pci_irq_enable(struct pci_dev *dev)
78 {
79 u32 virq;
80 int ret;
81 u8 pin;
82
83 ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
84 if (ret)
85 return pcibios_err_to_errno(ret);
86 if (!pin)
87 return 0;
88
89 virq = of_irq_parse_and_map_pci(dev, 0, 0);
90 if (virq == 0)
91 return -EINVAL;
92 dev->irq = virq;
93 return 0;
94 }
95
x86_of_pci_irq_disable(struct pci_dev * dev)96 static void x86_of_pci_irq_disable(struct pci_dev *dev)
97 {
98 }
99
x86_of_pci_init(void)100 void x86_of_pci_init(void)
101 {
102 pcibios_enable_irq = x86_of_pci_irq_enable;
103 pcibios_disable_irq = x86_of_pci_irq_disable;
104 }
105 #endif
106
dtb_setup_hpet(void)107 static void __init dtb_setup_hpet(void)
108 {
109 #ifdef CONFIG_HPET_TIMER
110 struct device_node *dn;
111 struct resource r;
112 int ret;
113
114 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
115 if (!dn)
116 return;
117 ret = of_address_to_resource(dn, 0, &r);
118 if (ret) {
119 WARN_ON(1);
120 return;
121 }
122 hpet_address = r.start;
123 #endif
124 }
125
126 #ifdef CONFIG_X86_LOCAL_APIC
127
dtb_cpu_setup(void)128 static void __init dtb_cpu_setup(void)
129 {
130 struct device_node *dn;
131 u32 apic_id;
132
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);
137 continue;
138 }
139 generic_processor_info(apic_id);
140 }
141 }
142
dtb_lapic_setup(void)143 static void __init dtb_lapic_setup(void)
144 {
145 struct device_node *dn;
146 struct resource r;
147 unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
148 int ret;
149
150 dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
151 if (dn) {
152 ret = of_address_to_resource(dn, 0, &r);
153 if (WARN_ON(ret))
154 return;
155 lapic_addr = r.start;
156 }
157
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))
162 return;
163 } else {
164 register_lapic_address(lapic_addr);
165 }
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");
169 }
170
171 #endif /* CONFIG_X86_LOCAL_APIC */
172
173 #ifdef CONFIG_X86_IO_APIC
174 static unsigned int ioapic_id;
175
176 struct of_ioapic_type {
177 u32 out_type;
178 u32 is_level;
179 u32 active_low;
180 };
181
182 static struct of_ioapic_type of_ioapic_type[] =
183 {
184 {
185 .out_type = IRQ_TYPE_EDGE_FALLING,
186 .is_level = 0,
187 .active_low = 1,
188 },
189 {
190 .out_type = IRQ_TYPE_LEVEL_HIGH,
191 .is_level = 1,
192 .active_low = 0,
193 },
194 {
195 .out_type = IRQ_TYPE_LEVEL_LOW,
196 .is_level = 1,
197 .active_low = 1,
198 },
199 {
200 .out_type = IRQ_TYPE_EDGE_RISING,
201 .is_level = 0,
202 .active_low = 0,
203 },
204 };
205
dt_irqdomain_alloc(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs,void * arg)206 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
207 unsigned int nr_irqs, void *arg)
208 {
209 struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
210 struct of_ioapic_type *it;
211 struct irq_alloc_info tmp;
212 int type_index;
213
214 if (WARN_ON(fwspec->param_count < 2))
215 return -EINVAL;
216
217 type_index = fwspec->param[1];
218 if (type_index >= ARRAY_SIZE(of_ioapic_type))
219 return -EINVAL;
220
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];
225
226 return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
227 }
228
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,
234 };
235
dtb_add_ioapic(struct device_node * dn)236 static void __init dtb_add_ioapic(struct device_node *dn)
237 {
238 struct resource r;
239 int ret;
240 struct ioapic_domain_cfg cfg = {
241 .type = IOAPIC_DOMAIN_DYNAMIC,
242 .ops = &ioapic_irq_domain_ops,
243 .dev = dn,
244 };
245
246 ret = of_address_to_resource(dn, 0, &r);
247 if (ret) {
248 pr_err("Can't obtain address from device node %pOF.\n", dn);
249 return;
250 }
251 mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
252 }
253
dtb_ioapic_setup(void)254 static void __init dtb_ioapic_setup(void)
255 {
256 struct device_node *dn;
257
258 for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
259 dtb_add_ioapic(dn);
260
261 if (nr_ioapics) {
262 of_ioapic = 1;
263 return;
264 }
265 pr_err("Error: No information about IO-APIC in OF.\n");
266 }
267 #else
dtb_ioapic_setup(void)268 static void __init dtb_ioapic_setup(void) {}
269 #endif
270
dtb_apic_setup(void)271 static void __init dtb_apic_setup(void)
272 {
273 #ifdef CONFIG_X86_LOCAL_APIC
274 dtb_lapic_setup();
275 dtb_cpu_setup();
276 #endif
277 dtb_ioapic_setup();
278 }
279
280 #ifdef CONFIG_OF_EARLY_FLATTREE
x86_flattree_get_config(void)281 static void __init x86_flattree_get_config(void)
282 {
283 u32 size, map_len;
284 void *dt;
285
286 if (!initial_dtb)
287 return;
288
289 map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
290
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);
296 map_len = size;
297 }
298
299 early_init_dt_verify(dt);
300 unflatten_and_copy_device_tree();
301 early_memunmap(dt, map_len);
302 }
303 #else
x86_flattree_get_config(void)304 static inline void x86_flattree_get_config(void) { }
305 #endif
306
x86_dtb_init(void)307 void __init x86_dtb_init(void)
308 {
309 x86_flattree_get_config();
310
311 if (!of_have_populated_dt())
312 return;
313
314 dtb_setup_hpet();
315 dtb_apic_setup();
316 }
317