1 #ifndef _POWERPC_PROM_H
2 #define _POWERPC_PROM_H
6 * Definitions for talking to the Open Firmware PROM on
7 * Power Macintosh computers.
9 * Copyright (C) 1996-2005 Paul Mackerras.
11 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
18 #include <linux/types.h>
19 #include <linux/proc_fs.h>
20 #include <linux/platform_device.h>
21 #include <asm/atomic.h>
23 /* Definitions used by the flattened device tree */
24 #define OF_DT_HEADER 0xd00dfeed /* marker */
25 #define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */
26 #define OF_DT_END_NODE 0x2 /* End node */
27 #define OF_DT_PROP 0x3 /* Property: name off, size,
29 #define OF_DT_NOP 0x4 /* nop */
32 #define OF_DT_VERSION 0x10
35 * This is what gets passed to the kernel by prom_init or kexec
37 * The dt struct contains the device tree structure, full pathes and
38 * property contents. The dt strings contain a separate block with just
39 * the strings for the property names, and is fully page aligned and
40 * self contained in a page, so that it can be kept around by the kernel,
41 * each property name appears only once in this page (cheap compression)
43 * the mem_rsvmap contains a map of reserved ranges of physical memory,
44 * passing it here instead of in the device-tree itself greatly simplifies
45 * the job of everybody. It's just a list of u64 pairs (base/size) that
48 struct boot_param_header
50 u32 magic; /* magic word OF_DT_HEADER */
51 u32 totalsize; /* total size of DT block */
52 u32 off_dt_struct; /* offset to structure */
53 u32 off_dt_strings; /* offset to strings */
54 u32 off_mem_rsvmap; /* offset to memory reserve map */
55 u32 version; /* format version */
56 u32 last_comp_version; /* last compatible version */
57 /* version 2 fields below */
58 u32 boot_cpuid_phys; /* Physical CPU id we're booting on */
59 /* version 3 fields below */
60 u32 dt_strings_size; /* size of the DT strings block */
72 struct property *next;
79 phandle linux_phandle;
82 struct property *properties;
83 struct property *deadprops; /* removed properties */
84 struct device_node *parent;
85 struct device_node *child;
86 struct device_node *sibling;
87 struct device_node *next; /* next device of same type */
88 struct device_node *allnext; /* next in list of all nodes */
89 struct proc_dir_entry *pde; /* this node's proc directory */
95 extern struct device_node *of_chosen;
97 /* flag descriptions */
98 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
100 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
101 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
103 #define HAVE_ARCH_DEVTREE_FIXUPS
105 static inline void set_node_proc_entry(struct device_node *dn, struct proc_dir_entry *de)
111 /* OBSOLETE: Old style node lookup */
112 extern struct device_node *find_devices(const char *name);
113 extern struct device_node *find_type_devices(const char *type);
114 extern struct device_node *find_path_device(const char *path);
115 extern struct device_node *find_compatible_devices(const char *type,
117 extern struct device_node *find_all_nodes(void);
119 /* New style node lookup */
120 extern struct device_node *of_find_node_by_name(struct device_node *from,
122 #define for_each_node_by_name(dn, name) \
123 for (dn = of_find_node_by_name(NULL, name); dn; \
124 dn = of_find_node_by_name(dn, name))
125 extern struct device_node *of_find_node_by_type(struct device_node *from,
127 #define for_each_node_by_type(dn, type) \
128 for (dn = of_find_node_by_type(NULL, type); dn; \
129 dn = of_find_node_by_type(dn, type))
130 extern struct device_node *of_find_compatible_node(struct device_node *from,
131 const char *type, const char *compat);
132 extern struct device_node *of_find_node_by_path(const char *path);
133 extern struct device_node *of_find_node_by_phandle(phandle handle);
134 extern struct device_node *of_find_all_nodes(struct device_node *prev);
135 extern struct device_node *of_get_parent(const struct device_node *node);
136 extern struct device_node *of_get_next_child(const struct device_node *node,
137 struct device_node *prev);
138 extern struct property *of_find_property(const struct device_node *np,
141 extern struct device_node *of_node_get(struct device_node *node);
142 extern void of_node_put(struct device_node *node);
144 /* For scanning the flat device-tree at boot time */
145 extern int __init of_scan_flat_dt(int (*it)(unsigned long node,
146 const char *uname, int depth,
149 extern void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
150 unsigned long *size);
151 extern int __init of_flat_dt_is_compatible(unsigned long node, const char *name);
152 extern unsigned long __init of_get_flat_dt_root(void);
154 /* For updating the device tree at runtime */
155 extern void of_attach_node(struct device_node *);
156 extern void of_detach_node(const struct device_node *);
158 /* Other Prototypes */
159 extern void finish_device_tree(void);
160 extern void unflatten_device_tree(void);
161 extern void early_init_devtree(void *);
162 extern int device_is_compatible(const struct device_node *device,
164 extern int machine_is_compatible(const char *compat);
165 extern const void *get_property(const struct device_node *node,
168 extern void print_properties(struct device_node *node);
169 extern int prom_n_addr_cells(struct device_node* np);
170 extern int prom_n_size_cells(struct device_node* np);
171 extern int prom_n_intr_cells(struct device_node* np);
172 extern void prom_get_irq_senses(unsigned char *senses, int off, int max);
173 extern int prom_add_property(struct device_node* np, struct property* prop);
174 extern int prom_remove_property(struct device_node *np, struct property *prop);
175 extern int prom_update_property(struct device_node *np,
176 struct property *newprop,
177 struct property *oldprop);
181 * PCI <-> OF matching functions
182 * (XXX should these be here?)
186 extern int pci_device_from_OF_node(struct device_node *node,
188 extern struct device_node* pci_busdev_to_OF_node(struct pci_bus *, int);
189 extern struct device_node* pci_device_to_OF_node(struct pci_dev *);
190 extern void pci_create_OF_bus_map(void);
193 extern struct resource *request_OF_resource(struct device_node* node,
194 int index, const char* name_postfix);
195 extern int release_OF_resource(struct device_node* node, int index);
199 * OF address retreival & translation
203 /* Helper to read a big number; size is in cells (not bytes) */
204 static inline u64 of_read_number(const u32 *cell, int size)
208 r = (r << 32) | *(cell++);
212 /* Like of_read_number, but we want an unsigned long result */
214 static inline unsigned long of_read_ulong(const u32 *cell, int size)
219 #define of_read_ulong(cell, size) of_read_number(cell, size)
222 /* Translate an OF address block into a CPU physical address
224 #define OF_BAD_ADDR ((u64)-1)
225 extern u64 of_translate_address(struct device_node *np, const u32 *addr);
227 /* Extract an address from a device, returns the region size and
228 * the address space flags too. The PCI version uses a BAR number
229 * instead of an absolute index
231 extern const u32 *of_get_address(struct device_node *dev, int index,
232 u64 *size, unsigned int *flags);
233 extern const u32 *of_get_pci_address(struct device_node *dev, int bar_no,
234 u64 *size, unsigned int *flags);
236 /* Get an address as a resource. Note that if your address is
237 * a PIO address, the conversion will fail if the physical address
238 * can't be internally converted to an IO token with
239 * pci_address_to_pio(), that is because it's either called to early
240 * or it can't be matched to any host bridge IO space
242 extern int of_address_to_resource(struct device_node *dev, int index,
244 extern int of_pci_address_to_resource(struct device_node *dev, int bar,
247 /* Parse the ibm,dma-window property of an OF node into the busno, phys and
250 void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
251 unsigned long *busno, unsigned long *phys, unsigned long *size);
253 extern void kdump_move_device_tree(void);
255 /* CPU OF node matching */
256 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
258 /* Get the MAC address */
259 extern const void *of_get_mac_address(struct device_node *np);
262 * OF interrupt mapping
265 /* This structure is returned when an interrupt is mapped. The controller
266 * field needs to be put() after use
269 #define OF_MAX_IRQ_SPEC 4 /* We handle specifiers of at most 4 cells */
272 struct device_node *controller; /* Interrupt controller node */
273 u32 size; /* Specifier size */
274 u32 specifier[OF_MAX_IRQ_SPEC]; /* Specifier copy */
278 * of_irq_map_init - Initialize the irq remapper
279 * @flags: flags defining workarounds to enable
281 * Some machines have bugs in the device-tree which require certain workarounds
282 * to be applied. Call this before any interrupt mapping attempts to enable
285 #define OF_IMAP_OLDWORLD_MAC 0x00000001
286 #define OF_IMAP_NO_PHANDLE 0x00000002
288 extern void of_irq_map_init(unsigned int flags);
291 * of_irq_map_raw - Low level interrupt tree parsing
292 * @parent: the device interrupt parent
293 * @intspec: interrupt specifier ("interrupts" property of the device)
294 * @ointsize: size of the passed in interrupt specifier
295 * @addr: address specifier (start of "reg" property of the device)
296 * @out_irq: structure of_irq filled by this function
298 * Returns 0 on success and a negative number on error
300 * This function is a low-level interrupt tree walking function. It
301 * can be used to do a partial walk with synthetized reg and interrupts
302 * properties, for example when resolving PCI interrupts when no device
303 * node exist for the parent.
307 extern int of_irq_map_raw(struct device_node *parent, const u32 *intspec,
308 u32 ointsize, const u32 *addr,
309 struct of_irq *out_irq);
313 * of_irq_map_one - Resolve an interrupt for a device
314 * @device: the device whose interrupt is to be resolved
315 * @index: index of the interrupt to resolve
316 * @out_irq: structure of_irq filled by this function
318 * This function resolves an interrupt, walking the tree, for a given
319 * device-tree node. It's the high level pendant to of_irq_map_raw().
320 * It also implements the workarounds for OldWolrd Macs.
322 extern int of_irq_map_one(struct device_node *device, int index,
323 struct of_irq *out_irq);
326 * of_irq_map_pci - Resolve the interrupt for a PCI device
327 * @pdev: the device whose interrupt is to be resolved
328 * @out_irq: structure of_irq filled by this function
330 * This function resolves the PCI interrupt for a given PCI device. If a
331 * device-node exists for a given pci_dev, it will use normal OF tree
332 * walking. If not, it will implement standard swizzling and walk up the
333 * PCI tree until an device-node is found, at which point it will finish
334 * resolving using the OF tree walking.
337 extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);
339 static inline int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
341 int irq = irq_of_parse_and_map(dev, index);
343 /* Only dereference the resource if both the
344 * resource and the irq are valid. */
345 if (r && irq != NO_IRQ) {
346 r->start = r->end = irq;
347 r->flags = IORESOURCE_IRQ;
354 #endif /* __KERNEL__ */
355 #endif /* _POWERPC_PROM_H */