[mirror_ubuntu-eoan-kernel.git] / arch / x86 / platform / olpc / olpc_dt.c

/*
 * OLPC-specific OFW device tree support code.
 *
 * 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 sparc by David S. Miller davem@davemloft.net
 *  Adapted for x86/OLPC by Andres Salomon <dilinger@queued.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/memblock.h>
#include <linux/of.h>
#include <linux/of_pdt.h>
#include <asm/olpc.h>
#include <asm/olpc_ofw.h>

static phandle __init olpc_dt_getsibling(phandle node)
{
	const void *args[] = { (void *)node };
	void *res[] = { &node };

	if ((s32)node == -1)
		return 0;

	if (olpc_ofw("peer", args, res) || (s32)node == -1)
		return 0;

	return node;
}

static phandle __init olpc_dt_getchild(phandle node)
{
	const void *args[] = { (void *)node };
	void *res[] = { &node };

	if ((s32)node == -1)
		return 0;

	if (olpc_ofw("child", args, res) || (s32)node == -1) {
		pr_err("PROM: %s: fetching child failed!\n", __func__);
		return 0;
	}

	return node;
}

static int __init olpc_dt_getproplen(phandle node, const char *prop)
{
	const void *args[] = { (void *)node, prop };
	int len;
	void *res[] = { &len };

	if ((s32)node == -1)
		return -1;

	if (olpc_ofw("getproplen", args, res)) {
		pr_err("PROM: %s: getproplen failed!\n", __func__);
		return -1;
	}

	return len;
}

static int __init olpc_dt_getproperty(phandle node, const char *prop,
		char *buf, int bufsize)
{
	int plen;

	plen = olpc_dt_getproplen(node, prop);
	if (plen > bufsize || plen < 1) {
		return -1;
	} else {
		const void *args[] = { (void *)node, prop, buf, (void *)plen };
		void *res[] = { &plen };

		if (olpc_ofw("getprop", args, res)) {
			pr_err("PROM: %s: getprop failed!\n", __func__);
			return -1;
		}
	}

	return plen;
}

static int __init olpc_dt_nextprop(phandle node, char *prev, char *buf)
{
	const void *args[] = { (void *)node, prev, buf };
	int success;
	void *res[] = { &success };

	buf[0] = '\0';

	if ((s32)node == -1)
		return -1;

	if (olpc_ofw("nextprop", args, res) || success != 1)
		return -1;

	return 0;
}

static int __init olpc_dt_pkg2path(phandle node, char *buf,
		const int buflen, int *len)
{
	const void *args[] = { (void *)node, buf, (void *)buflen };
	void *res[] = { len };

	if ((s32)node == -1)
		return -1;

	if (olpc_ofw("package-to-path", args, res) || *len < 1)
		return -1;

	return 0;
}

static unsigned int prom_early_allocated __initdata;

void * __init prom_early_alloc(unsigned long size)
{
	static u8 *mem;
	static size_t free_mem;
	void *res;

	if (free_mem < size) {
		const size_t chunk_size = max(PAGE_SIZE, size);

		/*
		 * To mimimize the number of allocations, grab at least
		 * PAGE_SIZE of memory (that's an arbitrary choice that's
		 * fast enough on the platforms we care about while minimizing
		 * wasted bootmem) and hand off chunks of it to callers.
		 */
		res = memblock_alloc(chunk_size, SMP_CACHE_BYTES);
		if (!res)
			panic("%s: Failed to allocate %zu bytes\n", __func__,
			      chunk_size);
		BUG_ON(!res);
		prom_early_allocated += chunk_size;
		memset(res, 0, chunk_size);
		free_mem = chunk_size;
		mem = res;
	}

	/* allocate from the local cache */
	free_mem -= size;
	res = mem;
	mem += size;
	return res;
}

static struct of_pdt_ops prom_olpc_ops __initdata = {
	.nextprop = olpc_dt_nextprop,
	.getproplen = olpc_dt_getproplen,
	.getproperty = olpc_dt_getproperty,
	.getchild = olpc_dt_getchild,
	.getsibling = olpc_dt_getsibling,
	.pkg2path = olpc_dt_pkg2path,
};

static phandle __init olpc_dt_finddevice(const char *path)
{
	phandle node;
	const void *args[] = { path };
	void *res[] = { &node };

	if (olpc_ofw("finddevice", args, res)) {
		pr_err("olpc_dt: finddevice failed!\n");
		return 0;
	}

	if ((s32) node == -1)
		return 0;

	return node;
}

static int __init olpc_dt_interpret(const char *words)
{
	int result;
	const void *args[] = { words };
	void *res[] = { &result };

	if (olpc_ofw("interpret", args, res)) {
		pr_err("olpc_dt: interpret failed!\n");
		return -1;
	}

	return result;
}

/*
 * Extract board revision directly from OFW device tree.
 * We can't use olpc_platform_info because that hasn't been set up yet.
 */
static u32 __init olpc_dt_get_board_revision(void)
{
	phandle node;
	__be32 rev;
	int r;

	node = olpc_dt_finddevice("/");
	if (!node)
		return 0;

	r = olpc_dt_getproperty(node, "board-revision-int",
				(char *) &rev, sizeof(rev));
	if (r < 0)
		return 0;

	return be32_to_cpu(rev);
}

void __init olpc_dt_fixup(void)
{
	int r;
	char buf[64];
	phandle node;
	u32 board_rev;

	node = olpc_dt_finddevice("/battery@0");
	if (!node)
		return;

	/*
	 * If the battery node has a compatible property, we are running a new
	 * enough firmware and don't have fixups to make.
	 */
	r = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
	if (r > 0)
		return;

	pr_info("PROM DT: Old firmware detected, applying fixes\n");

	/* Add olpc,xo1-battery compatible marker to battery node */
	olpc_dt_interpret("\" /battery@0\" find-device");
	olpc_dt_interpret("  \" olpc,xo1-battery\" +compatible");
	olpc_dt_interpret("device-end");

	board_rev = olpc_dt_get_board_revision();
	if (!board_rev)
		return;

	if (board_rev >= olpc_board_pre(0xd0)) {
		/* XO-1.5: add dcon device */
		olpc_dt_interpret("\" /pci/display@1\" find-device");
		olpc_dt_interpret("  new-device");
		olpc_dt_interpret("    \" dcon\" device-name");
		olpc_dt_interpret("    \" olpc,xo1-dcon\" +compatible");
		olpc_dt_interpret("  finish-device");
		olpc_dt_interpret("device-end");
	} else {
		/* XO-1: add dcon device, mark RTC as olpc,xo1-rtc */
		olpc_dt_interpret("\" /pci/display@1,1\" find-device");
		olpc_dt_interpret("  new-device");
		olpc_dt_interpret("    \" dcon\" device-name");
		olpc_dt_interpret("    \" olpc,xo1-dcon\" +compatible");
		olpc_dt_interpret("  finish-device");
		olpc_dt_interpret("device-end");

		olpc_dt_interpret("\" /rtc\" find-device");
		olpc_dt_interpret(" \" olpc,xo1-rtc\" +compatible");
		olpc_dt_interpret("device-end");
	}
}

void __init olpc_dt_build_devicetree(void)
{
	phandle root;

	if (!olpc_ofw_is_installed())
		return;

	olpc_dt_fixup();

	root = olpc_dt_getsibling(0);
	if (!root) {
		pr_err("PROM: unable to get root node from OFW!\n");
		return;
	}
	of_pdt_build_devicetree(root, &prom_olpc_ops);

	pr_info("PROM DT: Built device tree with %u bytes of memory.\n",
			prom_early_allocated);
}
Commit	Line	Data
c10d1e26 AS	1	/*
	2	* OLPC-specific OFW device tree support code.
	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 sparc by David S. Miller davem@davemloft.net
	11	* Adapted for x86/OLPC by Andres Salomon <dilinger@queued.net>
	12	*
	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.
	17	*/
	18
	19	#include <linux/kernel.h>
57c8a661	20	#include <linux/memblock.h>
c10d1e26 AS	21	#include <linux/of.h>
c10d1e26 AS	22	#include <linux/of_pdt.h>
45bb1674	23	#include <asm/olpc.h>
c10d1e26 AS	24	#include <asm/olpc_ofw.h>
	25
	26	static phandle __init olpc_dt_getsibling(phandle node)
	27	{
	28	const void args[] = { (void )node };
	29	void *res[] = { &node };
	30
	31	if ((s32)node == -1)
	32	return 0;
	33
	34	if (olpc_ofw("peer", args, res) \|\| (s32)node == -1)
	35	return 0;
	36
	37	return node;
	38	}
	39
	40	static phandle __init olpc_dt_getchild(phandle node)
	41	{
	42	const void args[] = { (void )node };
	43	void *res[] = { &node };
	44
	45	if ((s32)node == -1)
	46	return 0;
	47
	48	if (olpc_ofw("child", args, res) \|\| (s32)node == -1) {
	49	pr_err("PROM: %s: fetching child failed!\n", __func__);
	50	return 0;
	51	}
	52
	53	return node;
	54	}
	55
	56	static int __init olpc_dt_getproplen(phandle node, const char *prop)
	57	{
	58	const void args[] = { (void )node, prop };
	59	int len;
	60	void *res[] = { &len };
	61
	62	if ((s32)node == -1)
	63	return -1;
	64
	65	if (olpc_ofw("getproplen", args, res)) {
	66	pr_err("PROM: %s: getproplen failed!\n", __func__);
	67	return -1;
	68	}
	69
	70	return len;
	71	}
	72
	73	static int __init olpc_dt_getproperty(phandle node, const char *prop,
	74	char *buf, int bufsize)
	75	{
	76	int plen;
	77
	78	plen = olpc_dt_getproplen(node, prop);
	79	if (plen > bufsize \|\| plen < 1) {
	80	return -1;
	81	} else {
	82	const void args[] = { (void )node, prop, buf, (void *)plen };
	83	void *res[] = { &plen };
	84
	85	if (olpc_ofw("getprop", args, res)) {
	86	pr_err("PROM: %s: getprop failed!\n", __func__);
	87	return -1;
88	}
89	}
90
91	return plen;
92	}
93
94	static int __init olpc_dt_nextprop(phandle node, char prev, char buf)
95	{
96	const void args[] = { (void )node, prev, buf };
97	int success;
98	void *res[] = { &success };
99
100	buf[0] = '\0';
101
102	if ((s32)node == -1)
103	return -1;
104
105	if (olpc_ofw("nextprop", args, res) \|\| success != 1)
106	return -1;
107
108	return 0;
109	}
110
111	static int __init olpc_dt_pkg2path(phandle node, char *buf,
112	const int buflen, int *len)
113	{
114	const void args[] = { (void )node, buf, (void *)buflen };
115	void *res[] = { len };
116
117	if ((s32)node == -1)
118	return -1;
119
120	if (olpc_ofw("package-to-path", args, res) \|\| *len < 1)
121	return -1;
122
123	return 0;
124	}
125
126	static unsigned int prom_early_allocated __initdata;
127
128	void * __init prom_early_alloc(unsigned long size)
129	{
b5318d30 AS	130	static u8 *mem;
b5318d30 AS	131	static size_t free_mem;
c10d1e26 AS	132	void *res;
c10d1e26 AS	133
b5318d30 AS	134	if (free_mem < size) {
	135	const size_t chunk_size = max(PAGE_SIZE, size);
	136
	137	/*
	138	* To mimimize the number of allocations, grab at least
	139	* PAGE_SIZE of memory (that's an arbitrary choice that's
	140	* fast enough on the platforms we care about while minimizing
	141	* wasted bootmem) and hand off chunks of it to callers.
	142	*/
7e1c4e27	143	res = memblock_alloc(chunk_size, SMP_CACHE_BYTES);
8a7f97b9 MR	144	if (!res)
	145	panic("%s: Failed to allocate %zu bytes\n", __func__,
	146	chunk_size);
60cba5a5	147	BUG_ON(!res);
b5318d30 AS	148	prom_early_allocated += chunk_size;
	149	memset(res, 0, chunk_size);
	150	free_mem = chunk_size;
	151	mem = res;
	152	}
c10d1e26	153
b5318d30 AS	154	/* allocate from the local cache */
	155	free_mem -= size;
	156	res = mem;
	157	mem += size;
c10d1e26 AS	158	return res;
	159	}
	160
	161	static struct of_pdt_ops prom_olpc_ops __initdata = {
	162	.nextprop = olpc_dt_nextprop,
	163	.getproplen = olpc_dt_getproplen,
	164	.getproperty = olpc_dt_getproperty,
	165	.getchild = olpc_dt_getchild,
	166	.getsibling = olpc_dt_getsibling,
	167	.pkg2path = olpc_dt_pkg2path,
	168	};
	169
f70d8ef4 DD	170	static phandle __init olpc_dt_finddevice(const char *path)
	171	{
	172	phandle node;
	173	const void *args[] = { path };
	174	void *res[] = { &node };
	175
	176	if (olpc_ofw("finddevice", args, res)) {
	177	pr_err("olpc_dt: finddevice failed!\n");
	178	return 0;
	179	}
	180
	181	if ((s32) node == -1)
	182	return 0;
	183
	184	return node;
	185	}
	186
	187	static int __init olpc_dt_interpret(const char *words)
	188	{
	189	int result;
	190	const void *args[] = { words };
	191	void *res[] = { &result };
	192
	193	if (olpc_ofw("interpret", args, res)) {
	194	pr_err("olpc_dt: interpret failed!\n");
	195	return -1;
	196	}
	197
	198	return result;
	199	}
	200
	201	/*
	202	* Extract board revision directly from OFW device tree.
	203	* We can't use olpc_platform_info because that hasn't been set up yet.
	204	*/
	205	static u32 __init olpc_dt_get_board_revision(void)
	206	{
	207	phandle node;
	208	__be32 rev;
	209	int r;
	210
	211	node = olpc_dt_finddevice("/");
	212	if (!node)
	213	return 0;
	214
	215	r = olpc_dt_getproperty(node, "board-revision-int",
	216	(char *) &rev, sizeof(rev));
	217	if (r < 0)
	218	return 0;
	219
	220	return be32_to_cpu(rev);
	221	}
	222
	223	void __init olpc_dt_fixup(void)
	224	{
	225	int r;
	226	char buf[64];
	227	phandle node;
	228	u32 board_rev;
	229
	230	node = olpc_dt_finddevice("/battery@0");
	231	if (!node)
	232	return;
	233
234	/*
235	* If the battery node has a compatible property, we are running a new
236	* enough firmware and don't have fixups to make.
237	*/
238	r = olpc_dt_getproperty(node, "compatible", buf, sizeof(buf));
239	if (r > 0)
240	return;
241
242	pr_info("PROM DT: Old firmware detected, applying fixes\n");
243
244	/* Add olpc,xo1-battery compatible marker to battery node */
0806a13c LR	245	olpc_dt_interpret("\" /battery@0\" find-device");
	246	olpc_dt_interpret(" \" olpc,xo1-battery\" +compatible");
	247	olpc_dt_interpret("device-end");
f70d8ef4 DD	248
	249	board_rev = olpc_dt_get_board_revision();
	250	if (!board_rev)
	251	return;
	252
	253	if (board_rev >= olpc_board_pre(0xd0)) {
	254	/* XO-1.5: add dcon device */
0806a13c LR	255	olpc_dt_interpret("\" /pci/display@1\" find-device");
	256	olpc_dt_interpret(" new-device");
	257	olpc_dt_interpret(" \" dcon\" device-name");
	258	olpc_dt_interpret(" \" olpc,xo1-dcon\" +compatible");
	259	olpc_dt_interpret(" finish-device");
	260	olpc_dt_interpret("device-end");
f70d8ef4 DD	261	} else {
f70d8ef4 DD	262	/* XO-1: add dcon device, mark RTC as olpc,xo1-rtc */
0806a13c LR	263	olpc_dt_interpret("\" /pci/display@1,1\" find-device");
	264	olpc_dt_interpret(" new-device");
	265	olpc_dt_interpret(" \" dcon\" device-name");
	266	olpc_dt_interpret(" \" olpc,xo1-dcon\" +compatible");
	267	olpc_dt_interpret(" finish-device");
	268	olpc_dt_interpret("device-end");
	269
	270	olpc_dt_interpret("\" /rtc\" find-device");
	271	olpc_dt_interpret(" \" olpc,xo1-rtc\" +compatible");
	272	olpc_dt_interpret("device-end");
f70d8ef4 DD	273	}
	274	}
	275
c10d1e26 AS	276	void __init olpc_dt_build_devicetree(void)
	277	{
	278	phandle root;
	279
	280	if (!olpc_ofw_is_installed())
	281	return;
	282
f70d8ef4 DD	283	olpc_dt_fixup();
f70d8ef4 DD	284
c10d1e26 AS	285	root = olpc_dt_getsibling(0);
	286	if (!root) {
	287	pr_err("PROM: unable to get root node from OFW!\n");
	288	return;
	289	}
	290	of_pdt_build_devicetree(root, &prom_olpc_ops);
	291
	292	pr_info("PROM DT: Built device tree with %u bytes of memory.\n",
	293	prom_early_allocated);
	294	}