[linux-2.6-block.git] / drivers / pnp / system.c

/*
 * system.c - a driver for reserving pnp system resources
 *
 * Some code is based on pnpbios_core.c
 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
 * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 */

#include <linux/pnp.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/ioport.h>

static const struct pnp_device_id pnp_dev_table[] = {
	/* General ID for reserving resources */
	{"PNP0c02", 0},
	/* memory controller */
	{"PNP0c01", 0},
	{"", 0}
};

static void reserve_range(struct pnp_dev *dev, resource_size_t start,
			  resource_size_t end, int port)
{
	char *regionid;
	const char *pnpid = dev->dev.bus_id;
	struct resource *res;

	regionid = kmalloc(16, GFP_KERNEL);
	if (!regionid)
		return;

	snprintf(regionid, 16, "pnp %s", pnpid);
	if (port)
		res = request_region(start, end - start + 1, regionid);
	else
		res = request_mem_region(start, end - start + 1, regionid);
	if (res)
		res->flags &= ~IORESOURCE_BUSY;
	else
		kfree(regionid);

	/*
	 * Failures at this point are usually harmless. pci quirks for
	 * example do reserve stuff they know about too, so we may well
	 * have double reservations.
	 */
	dev_info(&dev->dev, "%s range 0x%llx-0x%llx %s reserved\n",
		port ? "ioport" : "iomem",
		(unsigned long long) start, (unsigned long long) end,
		res ? "has been" : "could not be");
}

static void reserve_resources_of_dev(struct pnp_dev *dev)
{
	int i;

	for (i = 0; i < PNP_MAX_PORT; i++) {
		if (!pnp_port_valid(dev, i))
			continue;
		if (pnp_port_start(dev, i) == 0)
			continue;	/* disabled */
		if (pnp_port_start(dev, i) < 0x100)
			/*
			 * Below 0x100 is only standard PC hardware
			 * (pics, kbd, timer, dma, ...)
			 * We should not get resource conflicts there,
			 * and the kernel reserves these anyway
			 * (see arch/i386/kernel/setup.c).
			 * So, do nothing
			 */
			continue;
		if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
			continue;	/* invalid */

		reserve_range(dev, pnp_port_start(dev, i),
			      pnp_port_end(dev, i), 1);
	}

	for (i = 0; i < PNP_MAX_MEM; i++) {
		if (!pnp_mem_valid(dev, i))
			continue;

		reserve_range(dev, pnp_mem_start(dev, i),
			      pnp_mem_end(dev, i), 0);
	}
}

static int system_pnp_probe(struct pnp_dev *dev,
			    const struct pnp_device_id *dev_id)
{
	reserve_resources_of_dev(dev);
	return 0;
}

static struct pnp_driver system_pnp_driver = {
	.name     = "system",
	.id_table = pnp_dev_table,
	.flags    = PNP_DRIVER_RES_DO_NOT_CHANGE,
	.probe    = system_pnp_probe,
};

static int __init pnp_system_init(void)
{
	return pnp_register_driver(&system_pnp_driver);
}

/**
 * Reserve motherboard resources after PCI claim BARs,
 * but before PCI assign resources for uninitialized PCI devices
 */
fs_initcall(pnp_system_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* system.c - a driver for reserving pnp system resources
	3	*
	4	* Some code is based on pnpbios_core.c
	5	* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
a8c78f7f BH	6	* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
a8c78f7f BH	7	* Bjorn Helgaas <bjorn.helgaas@hp.com>
1da177e4 LT	8	*/
	9
	10	#include <linux/pnp.h>
	11	#include <linux/device.h>
	12	#include <linux/init.h>
	13	#include <linux/slab.h>
	14	#include <linux/kernel.h>
	15	#include <linux/ioport.h>
	16
	17	static const struct pnp_device_id pnp_dev_table[] = {
	18	/* General ID for reserving resources */
9dd78466	19	{"PNP0c02", 0},
1da177e4	20	/* memory controller */
9dd78466 BH	21	{"PNP0c01", 0},
9dd78466 BH	22	{"", 0}
1da177e4 LT	23	};
1da177e4 LT	24
b933e19d	25	static void reserve_range(struct pnp_dev *dev, resource_size_t start,
9dd78466	26	resource_size_t end, int port)
1da177e4	27	{
1da177e4	28	char *regionid;
b933e19d BH	29	const char *pnpid = dev->dev.bus_id;
b933e19d BH	30	struct resource *res;
1da177e4 LT	31
1da177e4 LT	32	regionid = kmalloc(16, GFP_KERNEL);
b933e19d	33	if (!regionid)
1da177e4	34	return;
b933e19d	35
1da177e4	36	snprintf(regionid, 16, "pnp %s", pnpid);
a8c78f7f	37	if (port)
9dd78466	38	res = request_region(start, end - start + 1, regionid);
a8c78f7f	39	else
9dd78466	40	res = request_mem_region(start, end - start + 1, regionid);
b933e19d	41	if (res)
1da177e4	42	res->flags &= ~IORESOURCE_BUSY;
b933e19d BH	43	else
	44	kfree(regionid);
	45
1da177e4 LT	46	/*
	47	* Failures at this point are usually harmless. pci quirks for
	48	* example do reserve stuff they know about too, so we may well
	49	* have double reservations.
	50	*/
b933e19d BH	51	dev_info(&dev->dev, "%s range 0x%llx-0x%llx %s reserved\n",
	52	port ? "ioport" : "iomem",
	53	(unsigned long long) start, (unsigned long long) end,
	54	res ? "has been" : "could not be");
1da177e4 LT	55	}
1da177e4 LT	56
b933e19d	57	static void reserve_resources_of_dev(struct pnp_dev *dev)
1da177e4 LT	58	{
	59	int i;
	60
5859554c	61	for (i = 0; i < PNP_MAX_PORT; i++) {
1da177e4	62	if (!pnp_port_valid(dev, i))
1da177e4 LT	63	continue;
1da177e4 LT	64	if (pnp_port_start(dev, i) == 0)
5859554c	65	continue; /* disabled */
1da177e4 LT	66	if (pnp_port_start(dev, i) < 0x100)
	67	/*
	68	* Below 0x100 is only standard PC hardware
	69	* (pics, kbd, timer, dma, ...)
	70	* We should not get resource conflicts there,
	71	* and the kernel reserves these anyway
	72	* (see arch/i386/kernel/setup.c).
	73	* So, do nothing
	74	*/
	75	continue;
	76	if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
5859554c BH	77	continue; /* invalid */
5859554c BH	78
b933e19d	79	reserve_range(dev, pnp_port_start(dev, i),
9dd78466	80	pnp_port_end(dev, i), 1);
1da177e4 LT	81	}
1da177e4 LT	82
a8c78f7f BH	83	for (i = 0; i < PNP_MAX_MEM; i++) {
	84	if (!pnp_mem_valid(dev, i))
	85	continue;
	86
b933e19d	87	reserve_range(dev, pnp_mem_start(dev, i),
9dd78466	88	pnp_mem_end(dev, i), 0);
a8c78f7f	89	}
1da177e4 LT	90	}
1da177e4 LT	91
9dd78466 BH	92	static int system_pnp_probe(struct pnp_dev *dev,
9dd78466 BH	93	const struct pnp_device_id *dev_id)
1da177e4 LT	94	{
	95	reserve_resources_of_dev(dev);
	96	return 0;
	97	}
	98
	99	static struct pnp_driver system_pnp_driver = {
07d4e9af	100	.name = "system",
9dd78466	101	.id_table = pnp_dev_table,
07d4e9af BH	102	.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
07d4e9af BH	103	.probe = system_pnp_probe,
1da177e4 LT	104	};
	105
	106	static int __init pnp_system_init(void)
	107	{
	108	return pnp_register_driver(&system_pnp_driver);
	109	}
	110
	111	/**
	112	* Reserve motherboard resources after PCI claim BARs,
	113	* but before PCI assign resources for uninitialized PCI devices
	114	*/
	115	fs_initcall(pnp_system_init);