[deliverable/linux.git] / arch / sparc / kernel / prom_32.c

/*
 * Procedures for creating, accessing and interpreting the device tree.
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 * 
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com 
 *
 *  Adapted for sparc32 by David S. Miller davem@davemloft.net
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/module.h>

#include <asm/prom.h>
#include <asm/oplib.h>

#include "prom.h"

static unsigned int prom_early_allocated;

void * __init prom_early_alloc(unsigned long size)
{
	void *ret;

	ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
	if (ret != NULL)
		memset(ret, 0, size);

	prom_early_allocated += size;

	return ret;
}

static int is_root_node(const struct device_node *dp)
{
	if (!dp)
		return 0;

	return (dp->parent == NULL);
}

/* The following routines deal with the black magic of fully naming a
 * node.
 *
 * Certain well known named nodes are just the simple name string.
 *
 * Actual devices have an address specifier appended to the base name
 * string, like this "foo@addr".  The "addr" can be in any number of
 * formats, and the platform plus the type of the node determine the
 * format and how it is constructed.
 *
 * For children of the ROOT node, the naming convention is fixed and
 * determined by whether this is a sun4u or sun4v system.
 *
 * For children of other nodes, it is bus type specific.  So
 * we walk up the tree until we discover a "device_type" property
 * we recognize and we go from there.
 */
static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
{
	struct linux_prom_registers *regs;
	struct property *rprop;

	rprop = of_find_property(dp, "reg", NULL);
	if (!rprop)
		return;

	regs = rprop->value;
	sprintf(tmp_buf, "%s@%x,%x",
		dp->name,
		regs->which_io, regs->phys_addr);
}

/* "name@slot,offset"  */
static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
{
	struct linux_prom_registers *regs;
	struct property *prop;

	prop = of_find_property(dp, "reg", NULL);
	if (!prop)
		return;

	regs = prop->value;
	sprintf(tmp_buf, "%s@%x,%x",
		dp->name,
		regs->which_io,
		regs->phys_addr);
}

/* "name@devnum[,func]" */
static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
{
	struct linux_prom_pci_registers *regs;
	struct property *prop;
	unsigned int devfn;

	prop = of_find_property(dp, "reg", NULL);
	if (!prop)
		return;

	regs = prop->value;
	devfn = (regs->phys_hi >> 8) & 0xff;
	if (devfn & 0x07) {
		sprintf(tmp_buf, "%s@%x,%x",
			dp->name,
			devfn >> 3,
			devfn & 0x07);
	} else {
		sprintf(tmp_buf, "%s@%x",
			dp->name,
			devfn >> 3);
	}
}

/* "name@addrhi,addrlo" */
static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
{
	struct linux_prom_registers *regs;
	struct property *prop;

	prop = of_find_property(dp, "reg", NULL);
	if (!prop)
		return;

	regs = prop->value;

	sprintf(tmp_buf, "%s@%x,%x",
		dp->name,
		regs->which_io, regs->phys_addr);
}

static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
{
	struct device_node *parent = dp->parent;

	if (parent != NULL) {
		if (!strcmp(parent->type, "pci") ||
		    !strcmp(parent->type, "pciex"))
			return pci_path_component(dp, tmp_buf);
		if (!strcmp(parent->type, "sbus"))
			return sbus_path_component(dp, tmp_buf);
		if (!strcmp(parent->type, "ebus"))
			return ebus_path_component(dp, tmp_buf);

		/* "isa" is handled with platform naming */
	}

	/* Use platform naming convention.  */
	return sparc32_path_component(dp, tmp_buf);
}

static char * __init build_path_component(struct device_node *dp)
{
	char tmp_buf[64], *n;

	tmp_buf[0] = '\0';
	__build_path_component(dp, tmp_buf);
	if (tmp_buf[0] == '\0')
		strcpy(tmp_buf, dp->name);

	n = prom_early_alloc(strlen(tmp_buf) + 1);
	strcpy(n, tmp_buf);

	return n;
}

static char * __init build_full_name(struct device_node *dp)
{
	int len, ourlen, plen;
	char *n;

	plen = strlen(dp->parent->full_name);
	ourlen = strlen(dp->path_component_name);
	len = ourlen + plen + 2;

	n = prom_early_alloc(len);
	strcpy(n, dp->parent->full_name);
	if (!is_root_node(dp->parent)) {
		strcpy(n + plen, "/");
		plen++;
	}
	strcpy(n + plen, dp->path_component_name);

	return n;
}

static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp)
{
	struct device_node *dp;

	dp = create_node(node, parent);
	if (dp) {
		*(*nextp) = dp;
		*nextp = &dp->allnext;

		dp->parent = parent;
		dp->path_component_name = build_path_component(dp);
		dp->full_name = build_full_name(dp);

		dp->child = build_tree(dp, prom_getchild(node), nextp);

		dp->sibling = build_tree(parent, prom_getsibling(node), nextp);
	}

	return dp;
}

struct device_node *of_console_device;
EXPORT_SYMBOL(of_console_device);

char *of_console_path;
EXPORT_SYMBOL(of_console_path);

char *of_console_options;
EXPORT_SYMBOL(of_console_options);

extern void restore_current(void);

static void __init of_console_init(void)
{
	char *msg = "OF stdout device is: %s\n";
	struct device_node *dp;
	unsigned long flags;
	const char *type;
	phandle node;
	int skip, tmp, fd;

	of_console_path = prom_early_alloc(256);

	switch (prom_vers) {
	case PROM_V0:
		skip = 0;
		switch (*romvec->pv_stdout) {
		case PROMDEV_SCREEN:
			type = "display";
			break;

		case PROMDEV_TTYB:
			skip = 1;
			/* FALLTHRU */

		case PROMDEV_TTYA:
			type = "serial";
			break;

		default:
			prom_printf("Invalid PROM_V0 stdout value %u\n",
				    *romvec->pv_stdout);
			prom_halt();
		}

		tmp = skip;
		for_each_node_by_type(dp, type) {
			if (!tmp--)
				break;
		}
		if (!dp) {
			prom_printf("Cannot find PROM_V0 console node.\n");
			prom_halt();
		}
		of_console_device = dp;

		strcpy(of_console_path, dp->full_name);
		if (!strcmp(type, "serial")) {
			strcat(of_console_path,
			       (skip ? ":b" : ":a"));
		}
		break;

	default:
	case PROM_V2:
	case PROM_V3:
		fd = *romvec->pv_v2bootargs.fd_stdout;

		spin_lock_irqsave(&prom_lock, flags);
		node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
		restore_current();
		spin_unlock_irqrestore(&prom_lock, flags);

		if (!node) {
			prom_printf("Cannot resolve stdout node from "
				    "instance %08x.\n", fd);
			prom_halt();
		}
		dp = of_find_node_by_phandle(node);
		type = of_get_property(dp, "device_type", NULL);

		if (!type) {
			prom_printf("Console stdout lacks "
				    "device_type property.\n");
			prom_halt();
		}

		if (strcmp(type, "display") && strcmp(type, "serial")) {
			prom_printf("Console device_type is neither display "
				    "nor serial.\n");
			prom_halt();
		}

		of_console_device = dp;

		if (prom_vers == PROM_V2) {
			strcpy(of_console_path, dp->full_name);
			switch (*romvec->pv_stdout) {
			case PROMDEV_TTYA:
				strcat(of_console_path, ":a");
				break;
			case PROMDEV_TTYB:
				strcat(of_console_path, ":b");
				break;
			}
		} else {
			const char *path;

			dp = of_find_node_by_path("/");
			path = of_get_property(dp, "stdout-path", NULL);
			if (!path) {
				prom_printf("No stdout-path in root node.\n");
				prom_halt();
			}
			strcpy(of_console_path, path);
		}
		break;
	}

	of_console_options = strrchr(of_console_path, ':');
	if (of_console_options) {
		of_console_options++;
		if (*of_console_options == '\0')
			of_console_options = NULL;
	}

	prom_printf(msg, of_console_path);
	printk(msg, of_console_path);
}

void __init prom_build_devicetree(void)
{
	struct device_node **nextp;

	allnodes = create_node(prom_root_node, NULL);
	allnodes->path_component_name = "";
	allnodes->full_name = "/";

	nextp = &allnodes->allnext;
	allnodes->child = build_tree(allnodes,
				     prom_getchild(allnodes->node),
				     &nextp);
	of_console_init();

	printk("PROM: Built device tree with %u bytes of memory.\n",
	       prom_early_allocated);
}
Commit	Line	Data
942a6bdd DM	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	*/
	17
	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>
	23	#include <linux/module.h>
	24
	25	#include <asm/prom.h>
	26	#include <asm/oplib.h>
	27
657f201d	28	#include "prom.h"
fb7cd9d9	29
942a6bdd DM	30	static unsigned int prom_early_allocated;
942a6bdd DM	31
efeac2f8	32	void * __init prom_early_alloc(unsigned long size)
942a6bdd DM	33	{
	34	void *ret;
	35
	36	ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
	37	if (ret != NULL)
	38	memset(ret, 0, size);
	39
	40	prom_early_allocated += size;
	41
	42	return ret;
	43	}
	44
	45	static int is_root_node(const struct device_node *dp)
	46	{
	47	if (!dp)
	48	return 0;
	49
	50	return (dp->parent == NULL);
	51	}
	52
	53	/* The following routines deal with the black magic of fully naming a
	54	* node.
	55	*
	56	* Certain well known named nodes are just the simple name string.
	57	*
	58	* Actual devices have an address specifier appended to the base name
	59	* string, like this "foo@addr". The "addr" can be in any number of
	60	* formats, and the platform plus the type of the node determine the
	61	* format and how it is constructed.
	62	*
	63	* For children of the ROOT node, the naming convention is fixed and
	64	* determined by whether this is a sun4u or sun4v system.
	65	*
	66	* For children of other nodes, it is bus type specific. So
	67	* we walk up the tree until we discover a "device_type" property
	68	* we recognize and we go from there.
	69	*/
	70	static void __init sparc32_path_component(struct device_node dp, char tmp_buf)
	71	{
	72	struct linux_prom_registers *regs;
	73	struct property *rprop;
	74
	75	rprop = of_find_property(dp, "reg", NULL);
	76	if (!rprop)
	77	return;
	78
	79	regs = rprop->value;
	80	sprintf(tmp_buf, "%s@%x,%x",
	81	dp->name,
	82	regs->which_io, regs->phys_addr);
	83	}
	84
	85	/* "name@slot,offset" */
	86	static void __init sbus_path_component(struct device_node dp, char tmp_buf)
	87	{
	88	struct linux_prom_registers *regs;
	89	struct property *prop;
	90
	91	prop = of_find_property(dp, "reg", NULL);
	92	if (!prop)
	93	return;
	94
	95	regs = prop->value;
	96	sprintf(tmp_buf, "%s@%x,%x",
97	dp->name,
98	regs->which_io,
99	regs->phys_addr);
100	}
101
102	/* "name@devnum[,func]" */
103	static void __init pci_path_component(struct device_node dp, char tmp_buf)
104	{
105	struct linux_prom_pci_registers *regs;
106	struct property *prop;
107	unsigned int devfn;
108
109	prop = of_find_property(dp, "reg", NULL);
110	if (!prop)
111	return;
112
113	regs = prop->value;
114	devfn = (regs->phys_hi >> 8) & 0xff;
115	if (devfn & 0x07) {
116	sprintf(tmp_buf, "%s@%x,%x",
117	dp->name,
118	devfn >> 3,
119	devfn & 0x07);
120	} else {
121	sprintf(tmp_buf, "%s@%x",
122	dp->name,
123	devfn >> 3);
124	}
125	}
126
127	/* "name@addrhi,addrlo" */
128	static void __init ebus_path_component(struct device_node dp, char tmp_buf)
129	{
130	struct linux_prom_registers *regs;
131	struct property *prop;
132
133	prop = of_find_property(dp, "reg", NULL);
134	if (!prop)
135	return;
136
137	regs = prop->value;
138
139	sprintf(tmp_buf, "%s@%x,%x",
140	dp->name,
141	regs->which_io, regs->phys_addr);
142	}
143
144	static void __init __build_path_component(struct device_node dp, char tmp_buf)
145	{
146	struct device_node *parent = dp->parent;
147
148	if (parent != NULL) {
149	if (!strcmp(parent->type, "pci") \|\|
150	!strcmp(parent->type, "pciex"))
151	return pci_path_component(dp, tmp_buf);
152	if (!strcmp(parent->type, "sbus"))
153	return sbus_path_component(dp, tmp_buf);
154	if (!strcmp(parent->type, "ebus"))
155	return ebus_path_component(dp, tmp_buf);
156
157	/* "isa" is handled with platform naming */
158	}
159
160	/* Use platform naming convention. */
161	return sparc32_path_component(dp, tmp_buf);
162	}
163
164	static char * __init build_path_component(struct device_node *dp)
165	{
166	char tmp_buf[64], *n;
167
168	tmp_buf[0] = '\0';
169	__build_path_component(dp, tmp_buf);
170	if (tmp_buf[0] == '\0')
171	strcpy(tmp_buf, dp->name);
172
173	n = prom_early_alloc(strlen(tmp_buf) + 1);
174	strcpy(n, tmp_buf);
175
176	return n;
177	}
178
179	static char * __init build_full_name(struct device_node *dp)
180	{
181	int len, ourlen, plen;
182	char *n;
183
184	plen = strlen(dp->parent->full_name);
185	ourlen = strlen(dp->path_component_name);
186	len = ourlen + plen + 2;
187
188	n = prom_early_alloc(len);
189	strcpy(n, dp->parent->full_name);
190	if (!is_root_node(dp->parent)) {
191	strcpy(n + plen, "/");
192	plen++;
193	}
194	strcpy(n + plen, dp->path_component_name);
195
196	return n;
197	}
198
942a6bdd DM	199	static struct device_node * __init build_tree(struct device_node parent, phandle node, struct device_node **nextp)
	200	{
	201	struct device_node *dp;
	202
06c0db72	203	dp = create_node(node, parent);
942a6bdd DM	204	if (dp) {
	205	(nextp) = dp;
	206	*nextp = &dp->allnext;
	207
	208	dp->parent = parent;
	209	dp->path_component_name = build_path_component(dp);
	210	dp->full_name = build_full_name(dp);
	211
	212	dp->child = build_tree(dp, prom_getchild(node), nextp);
	213
	214	dp->sibling = build_tree(parent, prom_getsibling(node), nextp);
	215	}
	216
	217	return dp;
	218	}
	219
c73fcc84 DM	220	struct device_node *of_console_device;
	221	EXPORT_SYMBOL(of_console_device);
	222
	223	char *of_console_path;
	224	EXPORT_SYMBOL(of_console_path);
	225
	226	char *of_console_options;
	227	EXPORT_SYMBOL(of_console_options);
	228
	229	extern void restore_current(void);
	230
	231	static void __init of_console_init(void)
	232	{
	233	char *msg = "OF stdout device is: %s\n";
	234	struct device_node *dp;
	235	unsigned long flags;
	236	const char *type;
	237	phandle node;
f623f388	238	int skip, tmp, fd;
c73fcc84 DM	239
	240	of_console_path = prom_early_alloc(256);
	241
	242	switch (prom_vers) {
	243	case PROM_V0:
c73fcc84 DM	244	skip = 0;
	245	switch (*romvec->pv_stdout) {
	246	case PROMDEV_SCREEN:
	247	type = "display";
	248	break;
	249
	250	case PROMDEV_TTYB:
	251	skip = 1;
	252	/* FALLTHRU */
	253
	254	case PROMDEV_TTYA:
	255	type = "serial";
	256	break;
	257
	258	default:
	259	prom_printf("Invalid PROM_V0 stdout value %u\n",
	260	*romvec->pv_stdout);
	261	prom_halt();
	262	}
	263
f623f388	264	tmp = skip;
c73fcc84	265	for_each_node_by_type(dp, type) {
f623f388	266	if (!tmp--)
c73fcc84 DM	267	break;
	268	}
	269	if (!dp) {
	270	prom_printf("Cannot find PROM_V0 console node.\n");
	271	prom_halt();
	272	}
	273	of_console_device = dp;
	274
	275	strcpy(of_console_path, dp->full_name);
	276	if (!strcmp(type, "serial")) {
	277	strcat(of_console_path,
	278	(skip ? ":b" : ":a"));
	279	}
	280	break;
	281
	282	default:
	283	case PROM_V2:
	284	case PROM_V3:
	285	fd = *romvec->pv_v2bootargs.fd_stdout;
	286
	287	spin_lock_irqsave(&prom_lock, flags);
	288	node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
	289	restore_current();
	290	spin_unlock_irqrestore(&prom_lock, flags);
	291
	292	if (!node) {
	293	prom_printf("Cannot resolve stdout node from "
	294	"instance %08x.\n", fd);
	295	prom_halt();
	296	}
	297	dp = of_find_node_by_phandle(node);
	298	type = of_get_property(dp, "device_type", NULL);
	299
	300	if (!type) {
	301	prom_printf("Console stdout lacks "
	302	"device_type property.\n");
	303	prom_halt();
	304	}
	305
	306	if (strcmp(type, "display") && strcmp(type, "serial")) {
	307	prom_printf("Console device_type is neither display "
	308	"nor serial.\n");
	309	prom_halt();
	310	}
	311
	312	of_console_device = dp;
	313
	314	if (prom_vers == PROM_V2) {
	315	strcpy(of_console_path, dp->full_name);
	316	switch (*romvec->pv_stdout) {
	317	case PROMDEV_TTYA:
	318	strcat(of_console_path, ":a");
	319	break;
	320	case PROMDEV_TTYB:
	321	strcat(of_console_path, ":b");
	322	break;
	323	}
	324	} else {
	325	const char *path;
	326
	327	dp = of_find_node_by_path("/");
	328	path = of_get_property(dp, "stdout-path", NULL);
	329	if (!path) {
	330	prom_printf("No stdout-path in root node.\n");
331	prom_halt();
332	}
333	strcpy(of_console_path, path);
334	}
335	break;
336	}
337
338	of_console_options = strrchr(of_console_path, ':');
339	if (of_console_options) {
340	of_console_options++;
341	if (*of_console_options == '\0')
342	of_console_options = NULL;
343	}
344
345	prom_printf(msg, of_console_path);
346	printk(msg, of_console_path);
347	}
348
942a6bdd DM	349	void __init prom_build_devicetree(void)
	350	{
	351	struct device_node **nextp;
	352
06c0db72	353	allnodes = create_node(prom_root_node, NULL);
942a6bdd DM	354	allnodes->path_component_name = "";
	355	allnodes->full_name = "/";
	356
	357	nextp = &allnodes->allnext;
	358	allnodes->child = build_tree(allnodes,
	359	prom_getchild(allnodes->node),
	360	&nextp);
c73fcc84 DM	361	of_console_init();
c73fcc84 DM	362
942a6bdd DM	363	printk("PROM: Built device tree with %u bytes of memory.\n",
	364	prom_early_allocated);
	365	}