[deliverable/linux.git] / drivers / sfi / sfi_acpi.c

/* sfi_acpi.c Simple Firmware Interface - ACPI extensions */

/*

  This file is provided under a dual BSD/GPLv2 license.  When using or
  redistributing this file, you may do so under either license.

  GPL LICENSE SUMMARY

  Copyright(c) 2009 Intel Corporation. All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  The full GNU General Public License is included in this distribution
  in the file called LICENSE.GPL.

  BSD LICENSE

  Copyright(c) 2009 Intel Corporation. All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.
    * Neither the name of Intel Corporation nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#define KMSG_COMPONENT "SFI"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/kernel.h>
#include <acpi/acpi.h>

#include <linux/sfi.h>
#include "sfi_core.h"

/*
 * SFI can access ACPI-defined tables via an optional ACPI XSDT.
 *
 * This allows re-use, and avoids re-definition, of standard tables.
 * For example, the "MCFG" table is defined by PCI, reserved by ACPI,
 * and is expected to be present many SFI-only systems.
 */

static struct acpi_table_xsdt *xsdt_va __read_mostly;

#define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \
	((ptable->header.length - sizeof(struct acpi_table_header)) / \
	(sizeof(entry_type)))

static inline struct sfi_table_header *acpi_to_sfi_th(
				struct acpi_table_header *th)
{
	return (struct sfi_table_header *)th;
}

static inline struct acpi_table_header *sfi_to_acpi_th(
				struct sfi_table_header *th)
{
	return (struct acpi_table_header *)th;
}

/*
 * sfi_acpi_parse_xsdt()
 *
 * Parse the ACPI XSDT for later access by sfi_acpi_table_parse().
 */
static int __init sfi_acpi_parse_xsdt(struct sfi_table_header *th)
{
	struct sfi_table_key key = SFI_ANY_KEY;
	int tbl_cnt, i;
	void *ret;

	xsdt_va = (struct acpi_table_xsdt *)th;
	tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
	for (i = 0; i < tbl_cnt; i++) {
		ret = sfi_check_table(xsdt_va->table_offset_entry[i], &key);
		if (IS_ERR(ret)) {
			disable_sfi();
			return -1;
		}
	}

	return 0;
}

int __init sfi_acpi_init(void)
{
	struct sfi_table_key xsdt_key = { .sig = SFI_SIG_XSDT };

	sfi_table_parse(SFI_SIG_XSDT, NULL, NULL, sfi_acpi_parse_xsdt);

	/* Only call the get_table to keep the table mapped */
	xsdt_va = (struct acpi_table_xsdt *)sfi_get_table(&xsdt_key);
	return 0;
}

static struct acpi_table_header *sfi_acpi_get_table(struct sfi_table_key *key)
{
	u32 tbl_cnt, i;
	void *ret;

	tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
	for (i = 0; i < tbl_cnt; i++) {
		ret = sfi_check_table(xsdt_va->table_offset_entry[i], key);
		if (!IS_ERR(ret) && ret)
			return sfi_to_acpi_th(ret);
	}

	return NULL;
}

static void sfi_acpi_put_table(struct acpi_table_header *table)
{
	sfi_put_table(acpi_to_sfi_th(table));
}

/*
 * sfi_acpi_table_parse()
 *
 * Find specified table in XSDT, run handler on it and return its return value
 */
int sfi_acpi_table_parse(char *signature, char *oem_id, char *oem_table_id,
			int(*handler)(struct acpi_table_header *))
{
	struct acpi_table_header *table = NULL;
	struct sfi_table_key key;
	int ret = 0;

	if (sfi_disabled)
		return -1;

	key.sig = signature;
	key.oem_id = oem_id;
	key.oem_table_id = oem_table_id;

	table = sfi_acpi_get_table(&key);
	if (!table)
		return -EINVAL;

	ret = handler(table);
	sfi_acpi_put_table(table);
	return ret;
}

static ssize_t sfi_acpi_table_show(struct file *filp, struct kobject *kobj,
			       struct bin_attribute *bin_attr, char *buf,
			       loff_t offset, size_t count)
{
	struct sfi_table_attr *tbl_attr =
	    container_of(bin_attr, struct sfi_table_attr, attr);
	struct acpi_table_header *th = NULL;
	struct sfi_table_key key;
	ssize_t cnt;

	key.sig = tbl_attr->name;
	key.oem_id = NULL;
	key.oem_table_id = NULL;

	th = sfi_acpi_get_table(&key);
	if (!th)
		return 0;

	cnt =  memory_read_from_buffer(buf, count, &offset,
					th, th->length);
	sfi_acpi_put_table(th);

	return cnt;
}


void __init sfi_acpi_sysfs_init(void)
{
	u32 tbl_cnt, i;
	struct sfi_table_attr *tbl_attr;

	tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
	for (i = 0; i < tbl_cnt; i++) {
		tbl_attr =
			sfi_sysfs_install_table(xsdt_va->table_offset_entry[i]);
		tbl_attr->attr.read = sfi_acpi_table_show;
	}

	return;
}
Commit	Line	Data
13e82d02 FT	1	/* sfi_acpi.c Simple Firmware Interface - ACPI extensions */
	2
	3	/*
	4
	5	This file is provided under a dual BSD/GPLv2 license. When using or
	6	redistributing this file, you may do so under either license.
	7
	8	GPL LICENSE SUMMARY
	9
	10	Copyright(c) 2009 Intel Corporation. All rights reserved.
	11
	12	This program is free software; you can redistribute it and/or modify
	13	it under the terms of version 2 of the GNU General Public License as
	14	published by the Free Software Foundation.
	15
	16	This program is distributed in the hope that it will be useful, but
	17	WITHOUT ANY WARRANTY; without even the implied warranty of
	18	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	General Public License for more details.
	20
	21	You should have received a copy of the GNU General Public License
	22	along with this program; if not, write to the Free Software
	23	Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	24	The full GNU General Public License is included in this distribution
	25	in the file called LICENSE.GPL.
	26
	27	BSD LICENSE
	28
	29	Copyright(c) 2009 Intel Corporation. All rights reserved.
	30
	31	Redistribution and use in source and binary forms, with or without
	32	modification, are permitted provided that the following conditions
	33	are met:
	34
	35	* Redistributions of source code must retain the above copyright
	36	notice, this list of conditions and the following disclaimer.
	37	* Redistributions in binary form must reproduce the above copyright
	38	notice, this list of conditions and the following disclaimer in
	39	the documentation and/or other materials provided with the
	40	distribution.
	41	* Neither the name of Intel Corporation nor the names of its
	42	contributors may be used to endorse or promote products derived
	43	from this software without specific prior written permission.
	44
	45	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	46	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	47	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	48	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	49	OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	50	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	51	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	52	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	53	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	54	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	55	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	56
	57	*/
	58
	59	#define KMSG_COMPONENT "SFI"
	60	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	61
	62	#include <linux/kernel.h>
	63	#include <acpi/acpi.h>
	64
65	#include <linux/sfi.h>
66	#include "sfi_core.h"
67
68	/*
69	* SFI can access ACPI-defined tables via an optional ACPI XSDT.
70	*
71	* This allows re-use, and avoids re-definition, of standard tables.
72	* For example, the "MCFG" table is defined by PCI, reserved by ACPI,
73	* and is expected to be present many SFI-only systems.
74	*/
75
76	static struct acpi_table_xsdt *xsdt_va __read_mostly;
77
78	#define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \
79	((ptable->header.length - sizeof(struct acpi_table_header)) / \
80	(sizeof(entry_type)))
81
82	static inline struct sfi_table_header *acpi_to_sfi_th(
83	struct acpi_table_header *th)
84	{
85	return (struct sfi_table_header *)th;
86	}
87
88	static inline struct acpi_table_header *sfi_to_acpi_th(
89	struct sfi_table_header *th)
90	{
91	return (struct acpi_table_header *)th;
92	}
93
94	/*
95	* sfi_acpi_parse_xsdt()
96	*
97	* Parse the ACPI XSDT for later access by sfi_acpi_table_parse().
98	*/
99	static int __init sfi_acpi_parse_xsdt(struct sfi_table_header *th)
100	{
101	struct sfi_table_key key = SFI_ANY_KEY;
102	int tbl_cnt, i;
103	void *ret;
104
105	xsdt_va = (struct acpi_table_xsdt *)th;
106	tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
107	for (i = 0; i < tbl_cnt; i++) {
108	ret = sfi_check_table(xsdt_va->table_offset_entry[i], &key);
109	if (IS_ERR(ret)) {
110	disable_sfi();
111	return -1;
112	}
113	}
114
115	return 0;
116	}
117
118	int __init sfi_acpi_init(void)
119	{
120	struct sfi_table_key xsdt_key = { .sig = SFI_SIG_XSDT };
121
122	sfi_table_parse(SFI_SIG_XSDT, NULL, NULL, sfi_acpi_parse_xsdt);
123
124	/* Only call the get_table to keep the table mapped */
125	xsdt_va = (struct acpi_table_xsdt *)sfi_get_table(&xsdt_key);
126	return 0;
127	}
128
129	static struct acpi_table_header sfi_acpi_get_table(struct sfi_table_key key)
130	{
131	u32 tbl_cnt, i;
132	void *ret;
133
134	tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
135	for (i = 0; i < tbl_cnt; i++) {
136	ret = sfi_check_table(xsdt_va->table_offset_entry[i], key);
137	if (!IS_ERR(ret) && ret)
138	return sfi_to_acpi_th(ret);
139	}
140
141	return NULL;
142	}
143
144	static void sfi_acpi_put_table(struct acpi_table_header *table)
145	{
146	sfi_put_table(acpi_to_sfi_th(table));
147	}
148
149	/*
150	* sfi_acpi_table_parse()
151	*
152	* Find specified table in XSDT, run handler on it and return its return value
153	*/
154	int sfi_acpi_table_parse(char signature, char oem_id, char *oem_table_id,
155	int(handler)(struct acpi_table_header ))
156	{
157	struct acpi_table_header *table = NULL;
158	struct sfi_table_key key;
159	int ret = 0;
160
161	if (sfi_disabled)
162	return -1;
163
164	key.sig = signature;
165	key.oem_id = oem_id;
166	key.oem_table_id = oem_table_id;
167
168	table = sfi_acpi_get_table(&key);
169	if (!table)
170	return -EINVAL;
171
172	ret = handler(table);
173	sfi_acpi_put_table(table);
174	return ret;
175	}
dce80a56 FT	176
	177	static ssize_t sfi_acpi_table_show(struct file filp, struct kobject kobj,
	178	struct bin_attribute bin_attr, char buf,
	179	loff_t offset, size_t count)
	180	{
	181	struct sfi_table_attr *tbl_attr =
	182	container_of(bin_attr, struct sfi_table_attr, attr);
	183	struct acpi_table_header *th = NULL;
	184	struct sfi_table_key key;
	185	ssize_t cnt;
	186
	187	key.sig = tbl_attr->name;
	188	key.oem_id = NULL;
	189	key.oem_table_id = NULL;
	190
	191	th = sfi_acpi_get_table(&key);
	192	if (!th)
	193	return 0;
	194
	195	cnt = memory_read_from_buffer(buf, count, &offset,
	196	th, th->length);
	197	sfi_acpi_put_table(th);
	198
	199	return cnt;
	200	}
	201
	202
	203	void __init sfi_acpi_sysfs_init(void)
	204	{
	205	u32 tbl_cnt, i;
	206	struct sfi_table_attr *tbl_attr;
	207
	208	tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
	209	for (i = 0; i < tbl_cnt; i++) {
	210	tbl_attr =
	211	sfi_sysfs_install_table(xsdt_va->table_offset_entry[i]);
	212	tbl_attr->attr.read = sfi_acpi_table_show;
	213	}
	214
	215	return;
	216	}