[linux.git] / drivers / acpi / motherboard.c

/* 
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *  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.
 *
 *  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.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

/* Purpose: Prevent PCMCIA cards from using motherboard resources. */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <asm/io.h>

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT		ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("acpi_motherboard")

/* Dell use PNP0C01 instead of PNP0C02 */
#define ACPI_MB_HID1			"PNP0C01"
#define ACPI_MB_HID2			"PNP0C02"
/**
 * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
 * Doesn't care about the failure of 'request_region', since other may reserve
 * the io ports as well
 */
#define IS_RESERVED_ADDR(base, len) \
	(((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
	&& ((base) + (len) > PCIBIOS_MIN_IO))
/*
 * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
 * the io ports if they really know they can use it, while
 * still preventing hotplug PCI devices from using it.
 */

/*
 * When CONFIG_PNP is enabled, pnp/system.c binds to PNP0C01
 * and PNP0C02, redundant with acpi_reserve_io_ranges().
 * But acpi_reserve_io_ranges() is necessary for !CONFIG_PNP.
 */
static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
{
	struct resource *requested_res = NULL;


	if (res->type == ACPI_RESOURCE_TYPE_IO) {
		struct acpi_resource_io *io_res = &res->data.io;

		if (io_res->minimum != io_res->maximum)
			return AE_OK;
		if (IS_RESERVED_ADDR
		    (io_res->minimum, io_res->address_length)) {
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Motherboard resources 0x%08x - 0x%08x\n",
					  io_res->minimum,
					  io_res->minimum +
					  io_res->address_length));
			requested_res =
			    request_region(io_res->minimum,
					   io_res->address_length, "motherboard");
		}
	} else if (res->type == ACPI_RESOURCE_TYPE_FIXED_IO) {
		struct acpi_resource_fixed_io *fixed_io_res =
		    &res->data.fixed_io;

		if (IS_RESERVED_ADDR
		    (fixed_io_res->address, fixed_io_res->address_length)) {
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Motherboard resources 0x%08x - 0x%08x\n",
					  fixed_io_res->address,
					  fixed_io_res->address +
					  fixed_io_res->address_length));
			requested_res =
			    request_region(fixed_io_res->address,
					   fixed_io_res->address_length,
					   "motherboard");
		}
	} else {
		/* Memory mapped IO? */
	}

	if (requested_res)
		requested_res->flags &= ~IORESOURCE_BUSY;
	return AE_OK;
}

static int acpi_motherboard_add(struct acpi_device *device)
{
	if (!device)
		return -EINVAL;
	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
			    acpi_reserve_io_ranges, NULL);

	return 0;
}

static struct acpi_driver acpi_motherboard_driver1 = {
	.name = "motherboard",
	.class = "",
	.ids = ACPI_MB_HID1,
	.ops = {
		.add = acpi_motherboard_add,
		},
};

static struct acpi_driver acpi_motherboard_driver2 = {
	.name = "motherboard",
	.class = "",
	.ids = ACPI_MB_HID2,
	.ops = {
		.add = acpi_motherboard_add,
		},
};

static void __init acpi_request_region (struct acpi_generic_address *addr,
	unsigned int length, char *desc)
{
	if (!addr->address || !length)
		return;

	if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
		request_region(addr->address, length, desc);
	else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
		request_mem_region(addr->address, length, desc);
}

static void __init acpi_reserve_resources(void)
{
	acpi_request_region(&acpi_gbl_FADT->xpm1a_evt_blk,
			       acpi_gbl_FADT->pm1_evt_len, "ACPI PM1a_EVT_BLK");

	acpi_request_region(&acpi_gbl_FADT->xpm1b_evt_blk,
			       acpi_gbl_FADT->pm1_evt_len, "ACPI PM1b_EVT_BLK");

	acpi_request_region(&acpi_gbl_FADT->xpm1a_cnt_blk,
			       acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1a_CNT_BLK");

	acpi_request_region(&acpi_gbl_FADT->xpm1b_cnt_blk,
			       acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1b_CNT_BLK");

	if (acpi_gbl_FADT->pm_tm_len == 4)
		acpi_request_region(&acpi_gbl_FADT->xpm_tmr_blk, 4, "ACPI PM_TMR");

	acpi_request_region(&acpi_gbl_FADT->xpm2_cnt_blk,
			       acpi_gbl_FADT->pm2_cnt_len, "ACPI PM2_CNT_BLK");

	/* Length of GPE blocks must be a non-negative multiple of 2 */

	if (!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
		acpi_request_region(&acpi_gbl_FADT->xgpe0_blk,
			       acpi_gbl_FADT->gpe0_blk_len, "ACPI GPE0_BLK");

	if (!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
		acpi_request_region(&acpi_gbl_FADT->xgpe1_blk,
			       acpi_gbl_FADT->gpe1_blk_len, "ACPI GPE1_BLK");
}

static int __init acpi_motherboard_init(void)
{
	acpi_bus_register_driver(&acpi_motherboard_driver1);
	acpi_bus_register_driver(&acpi_motherboard_driver2);
	/*
	 * Guarantee motherboard IO reservation first
	 * This module must run after scan.c
	 */
	if (!acpi_disabled)
		acpi_reserve_resources();
	return 0;
}

/**
 * Reserve motherboard resources after PCI claim BARs,
 * but before PCI assign resources for uninitialized PCI devices
 */
fs_initcall(acpi_motherboard_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License as published by
	5	* the Free Software Foundation; either version 2 of the License, or (at
	6	* your option) any later version.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	16	*
	17	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	18	*/
	19
	20	/* Purpose: Prevent PCMCIA cards from using motherboard resources. */
	21
	22	#include <linux/kernel.h>
	23	#include <linux/init.h>
	24	#include <linux/types.h>
	25	#include <linux/pci.h>
	26	#include <linux/ioport.h>
	27	#include <asm/io.h>
	28
	29	#include <acpi/acpi_bus.h>
	30	#include <acpi/acpi_drivers.h>
	31
	32	#define _COMPONENT ACPI_SYSTEM_COMPONENT
4be44fcd	33	ACPI_MODULE_NAME("acpi_motherboard")
1da177e4 LT	34
	35	/* Dell use PNP0C01 instead of PNP0C02 */
	36	#define ACPI_MB_HID1 "PNP0C01"
	37	#define ACPI_MB_HID2 "PNP0C02"
1da177e4 LT	38	/**
1da177e4 LT	39	* Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
cd090eed	40	* Doesn't care about the failure of 'request_region', since other may reserve
1da177e4 LT	41	* the io ports as well
	42	*/
	43	#define IS_RESERVED_ADDR(base, len) \
	44	(((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \
2ba84684	45	&& ((base) + (len) > PCIBIOS_MIN_IO))
1da177e4 LT	46	/*
	47	* Clearing the flag (IORESOURCE_BUSY) allows drivers to use
	48	* the io ports if they really know they can use it, while
cd090eed	49	* still preventing hotplug PCI devices from using it.
1da177e4	50	*/
f4d2e2d8 LB	51
	52	/*
	53	* When CONFIG_PNP is enabled, pnp/system.c binds to PNP0C01
	54	* and PNP0C02, redundant with acpi_reserve_io_ranges().
	55	* But acpi_reserve_io_ranges() is necessary for !CONFIG_PNP.
	56	*/
4be44fcd	57	static acpi_status acpi_reserve_io_ranges(struct acpi_resource res, void data)
1da177e4 LT	58	{
	59	struct resource *requested_res = NULL;
	60
1da177e4	61
50eca3eb	62	if (res->type == ACPI_RESOURCE_TYPE_IO) {
1da177e4 LT	63	struct acpi_resource_io *io_res = &res->data.io;
1da177e4 LT	64
50eca3eb	65	if (io_res->minimum != io_res->maximum)
d550d98d	66	return AE_OK;
4be44fcd	67	if (IS_RESERVED_ADDR
50eca3eb	68	(io_res->minimum, io_res->address_length)) {
4be44fcd LB	69	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	70	"Motherboard resources 0x%08x - 0x%08x\n",
50eca3eb BM	71	io_res->minimum,
	72	io_res->minimum +
	73	io_res->address_length));
4be44fcd	74	requested_res =
50eca3eb BM	75	request_region(io_res->minimum,
50eca3eb BM	76	io_res->address_length, "motherboard");
1da177e4	77	}
50eca3eb	78	} else if (res->type == ACPI_RESOURCE_TYPE_FIXED_IO) {
4be44fcd LB	79	struct acpi_resource_fixed_io *fixed_io_res =
	80	&res->data.fixed_io;
	81
	82	if (IS_RESERVED_ADDR
50eca3eb	83	(fixed_io_res->address, fixed_io_res->address_length)) {
4be44fcd LB	84	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd LB	85	"Motherboard resources 0x%08x - 0x%08x\n",
50eca3eb BM	86	fixed_io_res->address,
	87	fixed_io_res->address +
	88	fixed_io_res->address_length));
4be44fcd	89	requested_res =
50eca3eb BM	90	request_region(fixed_io_res->address,
50eca3eb BM	91	fixed_io_res->address_length,
4be44fcd	92	"motherboard");
1da177e4 LT	93	}
	94	} else {
	95	/* Memory mapped IO? */
	96	}
	97
	98	if (requested_res)
	99	requested_res->flags &= ~IORESOURCE_BUSY;
d550d98d	100	return AE_OK;
1da177e4 LT	101	}
1da177e4 LT	102
4be44fcd	103	static int acpi_motherboard_add(struct acpi_device *device)
1da177e4 LT	104	{
	105	if (!device)
	106	return -EINVAL;
4be44fcd LB	107	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
4be44fcd LB	108	acpi_reserve_io_ranges, NULL);
1da177e4 LT	109
	110	return 0;
	111	}
	112
	113	static struct acpi_driver acpi_motherboard_driver1 = {
4be44fcd LB	114	.name = "motherboard",
	115	.class = "",
	116	.ids = ACPI_MB_HID1,
	117	.ops = {
	118	.add = acpi_motherboard_add,
	119	},
1da177e4 LT	120	};
	121
	122	static struct acpi_driver acpi_motherboard_driver2 = {
4be44fcd LB	123	.name = "motherboard",
	124	.class = "",
	125	.ids = ACPI_MB_HID2,
	126	.ops = {
	127	.add = acpi_motherboard_add,
	128	},
1da177e4 LT	129	};
1da177e4 LT	130
81507ea9 BH	131	static void __init acpi_request_region (struct acpi_generic_address *addr,
	132	unsigned int length, char *desc)
	133	{
	134	if (!addr->address \|\| !length)
	135	return;
	136
	137	if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
	138	request_region(addr->address, length, desc);
	139	else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
	140	request_mem_region(addr->address, length, desc);
	141	}
	142
4be44fcd	143	static void __init acpi_reserve_resources(void)
1da177e4	144	{
81507ea9	145	acpi_request_region(&acpi_gbl_FADT->xpm1a_evt_blk,
cd090eed	146	acpi_gbl_FADT->pm1_evt_len, "ACPI PM1a_EVT_BLK");
1da177e4	147
81507ea9	148	acpi_request_region(&acpi_gbl_FADT->xpm1b_evt_blk,
cd090eed	149	acpi_gbl_FADT->pm1_evt_len, "ACPI PM1b_EVT_BLK");
1da177e4	150
81507ea9	151	acpi_request_region(&acpi_gbl_FADT->xpm1a_cnt_blk,
cd090eed	152	acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1a_CNT_BLK");
1da177e4	153
81507ea9	154	acpi_request_region(&acpi_gbl_FADT->xpm1b_cnt_blk,
cd090eed	155	acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1b_CNT_BLK");
1da177e4	156
81507ea9	157	if (acpi_gbl_FADT->pm_tm_len == 4)
cd090eed	158	acpi_request_region(&acpi_gbl_FADT->xpm_tmr_blk, 4, "ACPI PM_TMR");
1da177e4	159
81507ea9	160	acpi_request_region(&acpi_gbl_FADT->xpm2_cnt_blk,
cd090eed	161	acpi_gbl_FADT->pm2_cnt_len, "ACPI PM2_CNT_BLK");
1da177e4 LT	162
	163	/* Length of GPE blocks must be a non-negative multiple of 2 */
	164
81507ea9 BH	165	if (!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
81507ea9 BH	166	acpi_request_region(&acpi_gbl_FADT->xgpe0_blk,
cd090eed	167	acpi_gbl_FADT->gpe0_blk_len, "ACPI GPE0_BLK");
1da177e4	168
81507ea9 BH	169	if (!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
81507ea9 BH	170	acpi_request_region(&acpi_gbl_FADT->xgpe1_blk,
cd090eed	171	acpi_gbl_FADT->gpe1_blk_len, "ACPI GPE1_BLK");
1da177e4 LT	172	}
	173
	174	static int __init acpi_motherboard_init(void)
	175	{
	176	acpi_bus_register_driver(&acpi_motherboard_driver1);
	177	acpi_bus_register_driver(&acpi_motherboard_driver2);
cd090eed	178	/*
1da177e4 LT	179	* Guarantee motherboard IO reservation first
	180	* This module must run after scan.c
	181	*/
	182	if (!acpi_disabled)
4be44fcd	183	acpi_reserve_resources();
1da177e4 LT	184	return 0;
	185	}
	186
	187	/**
	188	* Reserve motherboard resources after PCI claim BARs,
	189	* but before PCI assign resources for uninitialized PCI devices
	190	*/
	191	fs_initcall(acpi_motherboard_init);