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1 /*
2  * Procedures for creating, accessing and interpreting the device tree.
3  *
4  * Paul Mackerras       August 1996.
5  * Copyright (C) 1996-2005 Paul Mackerras.
6  * 
7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8  *    {engebret|bergner}@us.ibm.com 
9  *
10  *  Adapted for sparc32 by David S. Miller davem@davemloft.net
11  *
12  *      This program is free software; you can redistribute it and/or
13  *      modify it under the terms of the GNU General Public License
14  *      as published by the Free Software Foundation; either version
15  *      2 of the License, or (at your option) any later version.
16  */
18 #include <linux/kernel.h>
19 #include <linux/types.h>
20 #include <linux/string.h>
21 #include <linux/mm.h>
22 #include <linux/bootmem.h>
24 #include <asm/prom.h>
25 #include <asm/oplib.h>
26 #include <asm/leon.h>
27 #include <asm/leon_amba.h>
29 #include "prom.h"
31 void * __init prom_early_alloc(unsigned long size)
32 {
33         void *ret;
35         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
36         if (ret != NULL)
37                 memset(ret, 0, size);
39         prom_early_allocated += size;
41         return ret;
42 }
44 /* The following routines deal with the black magic of fully naming a
45  * node.
46  *
47  * Certain well known named nodes are just the simple name string.
48  *
49  * Actual devices have an address specifier appended to the base name
50  * string, like this "foo@addr".  The "addr" can be in any number of
51  * formats, and the platform plus the type of the node determine the
52  * format and how it is constructed.
53  *
54  * For children of the ROOT node, the naming convention is fixed and
55  * determined by whether this is a sun4u or sun4v system.
56  *
57  * For children of other nodes, it is bus type specific.  So
58  * we walk up the tree until we discover a "device_type" property
59  * we recognize and we go from there.
60  */
61 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
62 {
63         struct linux_prom_registers *regs;
64         struct property *rprop;
66         rprop = of_find_property(dp, "reg", NULL);
67         if (!rprop)
68                 return;
70         regs = rprop->value;
71         sprintf(tmp_buf, "%pOFn@%x,%x",
72                 dp,
73                 regs->which_io, regs->phys_addr);
74 }
76 /* "name@slot,offset"  */
77 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
78 {
79         struct linux_prom_registers *regs;
80         struct property *prop;
82         prop = of_find_property(dp, "reg", NULL);
83         if (!prop)
84                 return;
86         regs = prop->value;
87         sprintf(tmp_buf, "%pOFn@%x,%x",
88                 dp,
89                 regs->which_io,
90                 regs->phys_addr);
91 }
93 /* "name@devnum[,func]" */
94 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
95 {
96         struct linux_prom_pci_registers *regs;
97         struct property *prop;
98         unsigned int devfn;
100         prop = of_find_property(dp, "reg", NULL);
101         if (!prop)
102                 return;
104         regs = prop->value;
105         devfn = (regs->phys_hi >> 8) & 0xff;
106         if (devfn & 0x07) {
107                 sprintf(tmp_buf, "%pOFn@%x,%x",
108                         dp,
109                         devfn >> 3,
110                         devfn & 0x07);
111         } else {
112                 sprintf(tmp_buf, "%pOFn@%x",
113                         dp,
114                         devfn >> 3);
115         }
118 /* "name@addrhi,addrlo" */
119 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
121         struct linux_prom_registers *regs;
122         struct property *prop;
124         prop = of_find_property(dp, "reg", NULL);
125         if (!prop)
126                 return;
128         regs = prop->value;
130         sprintf(tmp_buf, "%pOFn@%x,%x",
131                 dp,
132                 regs->which_io, regs->phys_addr);
135 /* "name:vendor:device@irq,addrlo" */
136 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
138         struct amba_prom_registers *regs;
139         unsigned int *intr, *device, *vendor, reg0;
140         struct property *prop;
141         int interrupt = 0;
143         /* In order to get a unique ID in the device tree (multiple AMBA devices
144          * may have the same name) the node number is printed
145          */
146         prop = of_find_property(dp, "reg", NULL);
147         if (!prop) {
148                 reg0 = (unsigned int)dp->phandle;
149         } else {
150                 regs = prop->value;
151                 reg0 = regs->phys_addr;
152         }
154         /* Not all cores have Interrupt */
155         prop = of_find_property(dp, "interrupts", NULL);
156         if (!prop)
157                 intr = &interrupt; /* IRQ0 does not exist */
158         else
159                 intr = prop->value;
161         prop = of_find_property(dp, "vendor", NULL);
162         if (!prop)
163                 return;
164         vendor = prop->value;
165         prop = of_find_property(dp, "device", NULL);
166         if (!prop)
167                 return;
168         device = prop->value;
170         sprintf(tmp_buf, "%pOFn:%d:%d@%x,%x",
171                 dp, *vendor, *device,
172                 *intr, reg0);
175 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
177         struct device_node *parent = dp->parent;
179         if (parent != NULL) {
180                 if (!strcmp(parent->type, "pci") ||
181                     !strcmp(parent->type, "pciex"))
182                         return pci_path_component(dp, tmp_buf);
183                 if (!strcmp(parent->type, "sbus"))
184                         return sbus_path_component(dp, tmp_buf);
185                 if (!strcmp(parent->type, "ebus"))
186                         return ebus_path_component(dp, tmp_buf);
187                 if (!strcmp(parent->type, "ambapp"))
188                         return ambapp_path_component(dp, tmp_buf);
190                 /* "isa" is handled with platform naming */
191         }
193         /* Use platform naming convention.  */
194         return sparc32_path_component(dp, tmp_buf);
197 char * __init build_path_component(struct device_node *dp)
199         char tmp_buf[64], *n;
201         tmp_buf[0] = '\0';
202         __build_path_component(dp, tmp_buf);
203         if (tmp_buf[0] == '\0')
204                 snprintf(tmp_buf, sizeof(tmp_buf), "%pOFn", dp);
206         n = prom_early_alloc(strlen(tmp_buf) + 1);
207         strcpy(n, tmp_buf);
209         return n;
212 extern void restore_current(void);
214 void __init of_console_init(void)
216         char *msg = "OF stdout device is: %s\n";
217         struct device_node *dp;
218         unsigned long flags;
219         const char *type;
220         phandle node;
221         int skip, tmp, fd;
223         of_console_path = prom_early_alloc(256);
225         switch (prom_vers) {
226         case PROM_V0:
227                 skip = 0;
228                 switch (*romvec->pv_stdout) {
229                 case PROMDEV_SCREEN:
230                         type = "display";
231                         break;
233                 case PROMDEV_TTYB:
234                         skip = 1;
235                         /* FALLTHRU */
237                 case PROMDEV_TTYA:
238                         type = "serial";
239                         break;
241                 default:
242                         prom_printf("Invalid PROM_V0 stdout value %u\n",
243                                     *romvec->pv_stdout);
244                         prom_halt();
245                 }
247                 tmp = skip;
248                 for_each_node_by_type(dp, type) {
249                         if (!tmp--)
250                                 break;
251                 }
252                 if (!dp) {
253                         prom_printf("Cannot find PROM_V0 console node.\n");
254                         prom_halt();
255                 }
256                 of_console_device = dp;
258                 strcpy(of_console_path, dp->full_name);
259                 if (!strcmp(type, "serial")) {
260                         strcat(of_console_path,
261                                (skip ? ":b" : ":a"));
262                 }
263                 break;
265         default:
266         case PROM_V2:
267         case PROM_V3:
268                 fd = *romvec->pv_v2bootargs.fd_stdout;
270                 spin_lock_irqsave(&prom_lock, flags);
271                 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
272                 restore_current();
273                 spin_unlock_irqrestore(&prom_lock, flags);
275                 if (!node) {
276                         prom_printf("Cannot resolve stdout node from "
277                                     "instance %08x.\n", fd);
278                         prom_halt();
279                 }
280                 dp = of_find_node_by_phandle(node);
281                 type = of_get_property(dp, "device_type", NULL);
283                 if (!type) {
284                         prom_printf("Console stdout lacks "
285                                     "device_type property.\n");
286                         prom_halt();
287                 }
289                 if (strcmp(type, "display") && strcmp(type, "serial")) {
290                         prom_printf("Console device_type is neither display "
291                                     "nor serial.\n");
292                         prom_halt();
293                 }
295                 of_console_device = dp;
297                 if (prom_vers == PROM_V2) {
298                         strcpy(of_console_path, dp->full_name);
299                         switch (*romvec->pv_stdout) {
300                         case PROMDEV_TTYA:
301                                 strcat(of_console_path, ":a");
302                                 break;
303                         case PROMDEV_TTYB:
304                                 strcat(of_console_path, ":b");
305                                 break;
306                         }
307                 } else {
308                         const char *path;
310                         dp = of_find_node_by_path("/");
311                         path = of_get_property(dp, "stdout-path", NULL);
312                         if (!path) {
313                                 prom_printf("No stdout-path in root node.\n");
314                                 prom_halt();
315                         }
316                         strcpy(of_console_path, path);
317                 }
318                 break;
319         }
321         of_console_options = strrchr(of_console_path, ':');
322         if (of_console_options) {
323                 of_console_options++;
324                 if (*of_console_options == '\0')
325                         of_console_options = NULL;
326         }
328         printk(msg, of_console_path);
331 void __init of_fill_in_cpu_data(void)
335 void __init irq_trans_init(struct device_node *dp)