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Linux/arch/x86/kernel/devicetree.c

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  1 /*
  2  * Architecture specific OF callbacks.
  3  */
  4 #include <linux/bootmem.h>
  5 #include <linux/export.h>
  6 #include <linux/io.h>
  7 #include <linux/irqdomain.h>
  8 #include <linux/interrupt.h>
  9 #include <linux/list.h>
 10 #include <linux/of.h>
 11 #include <linux/of_fdt.h>
 12 #include <linux/of_address.h>
 13 #include <linux/of_platform.h>
 14 #include <linux/of_irq.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/hpet.h>
 21 #include <asm/apic.h>
 22 #include <asm/pci_x86.h>
 23 #include <asm/setup.h>
 24 #include <asm/i8259.h>
 25 
 26 __initdata u64 initial_dtb;
 27 char __initdata cmd_line[COMMAND_LINE_SIZE];
 28 
 29 int __initdata of_ioapic;
 30 
 31 void __init early_init_dt_scan_chosen_arch(unsigned long node)
 32 {
 33         BUG();
 34 }
 35 
 36 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 37 {
 38         BUG();
 39 }
 40 
 41 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 42 {
 43         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
 44 }
 45 
 46 void __init add_dtb(u64 data)
 47 {
 48         initial_dtb = data + offsetof(struct setup_data, data);
 49 }
 50 
 51 /*
 52  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
 53  */
 54 static struct of_device_id __initdata ce4100_ids[] = {
 55         { .compatible = "intel,ce4100-cp", },
 56         { .compatible = "isa", },
 57         { .compatible = "pci", },
 58         {},
 59 };
 60 
 61 static int __init add_bus_probe(void)
 62 {
 63         if (!of_have_populated_dt())
 64                 return 0;
 65 
 66         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
 67 }
 68 module_init(add_bus_probe);
 69 
 70 #ifdef CONFIG_PCI
 71 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
 72 {
 73         struct device_node *np;
 74 
 75         for_each_node_by_type(np, "pci") {
 76                 const void *prop;
 77                 unsigned int bus_min;
 78 
 79                 prop = of_get_property(np, "bus-range", NULL);
 80                 if (!prop)
 81                         continue;
 82                 bus_min = be32_to_cpup(prop);
 83                 if (bus->number == bus_min)
 84                         return np;
 85         }
 86         return NULL;
 87 }
 88 
 89 static int x86_of_pci_irq_enable(struct pci_dev *dev)
 90 {
 91         u32 virq;
 92         int ret;
 93         u8 pin;
 94 
 95         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
 96         if (ret)
 97                 return ret;
 98         if (!pin)
 99                 return 0;
100 
101         virq = of_irq_parse_and_map_pci(dev, 0, 0);
102         if (virq == 0)
103                 return -EINVAL;
104         dev->irq = virq;
105         return 0;
106 }
107 
108 static void x86_of_pci_irq_disable(struct pci_dev *dev)
109 {
110 }
111 
112 void x86_of_pci_init(void)
113 {
114         pcibios_enable_irq = x86_of_pci_irq_enable;
115         pcibios_disable_irq = x86_of_pci_irq_disable;
116 }
117 #endif
118 
119 static void __init dtb_setup_hpet(void)
120 {
121 #ifdef CONFIG_HPET_TIMER
122         struct device_node *dn;
123         struct resource r;
124         int ret;
125 
126         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
127         if (!dn)
128                 return;
129         ret = of_address_to_resource(dn, 0, &r);
130         if (ret) {
131                 WARN_ON(1);
132                 return;
133         }
134         hpet_address = r.start;
135 #endif
136 }
137 
138 static void __init dtb_lapic_setup(void)
139 {
140 #ifdef CONFIG_X86_LOCAL_APIC
141         struct device_node *dn;
142         struct resource r;
143         int ret;
144 
145         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
146         if (!dn)
147                 return;
148 
149         ret = of_address_to_resource(dn, 0, &r);
150         if (WARN_ON(ret))
151                 return;
152 
153         /* Did the boot loader setup the local APIC ? */
154         if (!cpu_has_apic) {
155                 if (apic_force_enable(r.start))
156                         return;
157         }
158         smp_found_config = 1;
159         pic_mode = 1;
160         register_lapic_address(r.start);
161         generic_processor_info(boot_cpu_physical_apicid,
162                                GET_APIC_VERSION(apic_read(APIC_LVR)));
163 #endif
164 }
165 
166 #ifdef CONFIG_X86_IO_APIC
167 static unsigned int ioapic_id;
168 
169 struct of_ioapic_type {
170         u32 out_type;
171         u32 trigger;
172         u32 polarity;
173 };
174 
175 static struct of_ioapic_type of_ioapic_type[] =
176 {
177         {
178                 .out_type       = IRQ_TYPE_EDGE_RISING,
179                 .trigger        = IOAPIC_EDGE,
180                 .polarity       = 1,
181         },
182         {
183                 .out_type       = IRQ_TYPE_LEVEL_LOW,
184                 .trigger        = IOAPIC_LEVEL,
185                 .polarity       = 0,
186         },
187         {
188                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
189                 .trigger        = IOAPIC_LEVEL,
190                 .polarity       = 1,
191         },
192         {
193                 .out_type       = IRQ_TYPE_EDGE_FALLING,
194                 .trigger        = IOAPIC_EDGE,
195                 .polarity       = 0,
196         },
197 };
198 
199 static int ioapic_xlate(struct irq_domain *domain,
200                         struct device_node *controller,
201                         const u32 *intspec, u32 intsize,
202                         irq_hw_number_t *out_hwirq, u32 *out_type)
203 {
204         struct of_ioapic_type *it;
205         u32 line, idx, gsi;
206 
207         if (WARN_ON(intsize < 2))
208                 return -EINVAL;
209 
210         line = intspec[0];
211 
212         if (intspec[1] >= ARRAY_SIZE(of_ioapic_type))
213                 return -EINVAL;
214 
215         it = &of_ioapic_type[intspec[1]];
216 
217         idx = (u32)(long)domain->host_data;
218         gsi = mp_pin_to_gsi(idx, line);
219         if (mp_set_gsi_attr(gsi, it->trigger, it->polarity, cpu_to_node(0)))
220                 return -EBUSY;
221 
222         *out_hwirq = line;
223         *out_type = it->out_type;
224         return 0;
225 }
226 
227 const struct irq_domain_ops ioapic_irq_domain_ops = {
228         .map = mp_irqdomain_map,
229         .unmap = mp_irqdomain_unmap,
230         .xlate = ioapic_xlate,
231 };
232 
233 static void __init dtb_add_ioapic(struct device_node *dn)
234 {
235         struct resource r;
236         int ret;
237         struct ioapic_domain_cfg cfg = {
238                 .type = IOAPIC_DOMAIN_DYNAMIC,
239                 .ops = &ioapic_irq_domain_ops,
240                 .dev = dn,
241         };
242 
243         ret = of_address_to_resource(dn, 0, &r);
244         if (ret) {
245                 printk(KERN_ERR "Can't obtain address from node %s.\n",
246                                 dn->full_name);
247                 return;
248         }
249         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
250 }
251 
252 static void __init dtb_ioapic_setup(void)
253 {
254         struct device_node *dn;
255 
256         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
257                 dtb_add_ioapic(dn);
258 
259         if (nr_ioapics) {
260                 of_ioapic = 1;
261                 return;
262         }
263         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
264 }
265 #else
266 static void __init dtb_ioapic_setup(void) {}
267 #endif
268 
269 static void __init dtb_apic_setup(void)
270 {
271         dtb_lapic_setup();
272         dtb_ioapic_setup();
273 }
274 
275 #ifdef CONFIG_OF_FLATTREE
276 static void __init x86_flattree_get_config(void)
277 {
278         u32 size, map_len;
279         void *dt;
280 
281         if (!initial_dtb)
282                 return;
283 
284         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
285 
286         initial_boot_params = dt = early_memremap(initial_dtb, map_len);
287         size = of_get_flat_dt_size();
288         if (map_len < size) {
289                 early_iounmap(dt, map_len);
290                 initial_boot_params = dt = early_memremap(initial_dtb, size);
291                 map_len = size;
292         }
293 
294         unflatten_and_copy_device_tree();
295         early_iounmap(dt, map_len);
296 }
297 #else
298 static inline void x86_flattree_get_config(void) { }
299 #endif
300 
301 void __init x86_dtb_init(void)
302 {
303         x86_flattree_get_config();
304 
305         if (!of_have_populated_dt())
306                 return;
307 
308         dtb_setup_hpet();
309         dtb_apic_setup();
310 }
311 

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