[deliverable/linux.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(const char *pnpid, resource_size_t start,
			  resource_size_t end, int port)
{
	struct resource *res;
	char *regionid;

	regionid = kmalloc(16, GFP_KERNEL);
	if (regionid == NULL)
		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 == NULL)
		kfree(regionid);
	else
		res->flags &= ~IORESOURCE_BUSY;
	/*
	 * 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.
	 */
	printk(KERN_INFO
	       "pnp: %s: %s range 0x%llx-0x%llx %s reserved\n",
	       pnpid, port ? "ioport" : "iomem",
	       (unsigned long long)start, (unsigned long long)end,
	       NULL != res ? "has been" : "could not be");
}

static void reserve_resources_of_dev(const 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->dev.bus_id, 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->dev.bus_id, pnp_mem_start(dev, i),
			      pnp_mem_end(dev, i), 0);
	}

	return;
}

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,
	.remove = NULL,
};

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
9dd78466 BH	25	static void reserve_range(const char *pnpid, resource_size_t start,
9dd78466 BH	26	resource_size_t end, int port)
1da177e4 LT	27	{
	28	struct resource *res;
	29	char *regionid;
	30
	31	regionid = kmalloc(16, GFP_KERNEL);
5859554c	32	if (regionid == NULL)
1da177e4 LT	33	return;
1da177e4 LT	34	snprintf(regionid, 16, "pnp %s", pnpid);
a8c78f7f	35	if (port)
9dd78466	36	res = request_region(start, end - start + 1, regionid);
a8c78f7f	37	else
9dd78466	38	res = request_mem_region(start, end - start + 1, regionid);
5859554c BH	39	if (res == NULL)
5859554c BH	40	kfree(regionid);
1da177e4 LT	41	else
	42	res->flags &= ~IORESOURCE_BUSY;
	43	/*
	44	* Failures at this point are usually harmless. pci quirks for
	45	* example do reserve stuff they know about too, so we may well
	46	* have double reservations.
	47	*/
	48	printk(KERN_INFO
9dd78466 BH	49	"pnp: %s: %s range 0x%llx-0x%llx %s reserved\n",
	50	pnpid, port ? "ioport" : "iomem",
	51	(unsigned long long)start, (unsigned long long)end,
	52	NULL != res ? "has been" : "could not be");
1da177e4 LT	53	}
1da177e4 LT	54
a2b091db	55	static void reserve_resources_of_dev(const struct pnp_dev *dev)
1da177e4 LT	56	{
	57	int i;
	58
5859554c	59	for (i = 0; i < PNP_MAX_PORT; i++) {
1da177e4	60	if (!pnp_port_valid(dev, i))
1da177e4 LT	61	continue;
1da177e4 LT	62	if (pnp_port_start(dev, i) == 0)
5859554c	63	continue; /* disabled */
1da177e4 LT	64	if (pnp_port_start(dev, i) < 0x100)
	65	/*
	66	* Below 0x100 is only standard PC hardware
	67	* (pics, kbd, timer, dma, ...)
	68	* We should not get resource conflicts there,
	69	* and the kernel reserves these anyway
	70	* (see arch/i386/kernel/setup.c).
	71	* So, do nothing
	72	*/
	73	continue;
	74	if (pnp_port_end(dev, i) < pnp_port_start(dev, i))
5859554c BH	75	continue; /* invalid */
	76
	77	reserve_range(dev->dev.bus_id, pnp_port_start(dev, i),
9dd78466	78	pnp_port_end(dev, i), 1);
1da177e4 LT	79	}
1da177e4 LT	80
a8c78f7f BH	81	for (i = 0; i < PNP_MAX_MEM; i++) {
	82	if (!pnp_mem_valid(dev, i))
	83	continue;
	84
	85	reserve_range(dev->dev.bus_id, pnp_mem_start(dev, i),
9dd78466	86	pnp_mem_end(dev, i), 0);
a8c78f7f BH	87	}
a8c78f7f BH	88
1da177e4 LT	89	return;
	90	}
	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 = {
9dd78466 BH	100	.name = "system",
	101	.id_table = pnp_dev_table,
	102	.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
	103	.probe = system_pnp_probe,
	104	.remove = NULL,
1da177e4 LT	105	};
	106
	107	static int __init pnp_system_init(void)
	108	{
	109	return pnp_register_driver(&system_pnp_driver);
	110	}
	111
	112	/**
	113	* Reserve motherboard resources after PCI claim BARs,
	114	* but before PCI assign resources for uninitialized PCI devices
	115	*/
	116	fs_initcall(pnp_system_init);