drivers/pnp/quirks.c

/*
 *  This file contains quirk handling code for PnP devices
 *  Some devices do not report all their resources, and need to have extra
 *  resources added. This is most easily accomplished at initialisation time
 *  when building up the resource structure for the first time.
 *
 *  Copyright (c) 2000 Peter Denison <peterd@pnd-pc.demon.co.uk>
 *
 *  Heavily based on PCI quirks handling which is
 *
 *  Copyright (c) 1999 Martin Mares <mj@ucw.cz>
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/pnp.h>
#include <linux/io.h>
#include <linux/kallsyms.h>
#include "base.h"

static void quirk_awe32_resources(struct pnp_dev *dev)
{
	struct pnp_port *port, *port2, *port3;
	struct pnp_option *res = dev->dependent;

	/*
	 * Unfortunately the isapnp_add_port_resource is too tightly bound
	 * into the PnP discovery sequence, and cannot be used. Link in the
	 * two extra ports (at offset 0x400 and 0x800 from the one given) by
	 * hand.
	 */
	for (; res; res = res->next) {
		port2 = pnp_alloc(sizeof(struct pnp_port));
		if (!port2)
			return;
		port3 = pnp_alloc(sizeof(struct pnp_port));
		if (!port3) {
			kfree(port2);
			return;
		}
		port = res->port;
		memcpy(port2, port, sizeof(struct pnp_port));
		memcpy(port3, port, sizeof(struct pnp_port));
		port->next = port2;
		port2->next = port3;
		port2->min += 0x400;
		port2->max += 0x400;
		port3->min += 0x800;
		port3->max += 0x800;
	}
	printk(KERN_INFO "pnp: AWE32 quirk - adding two ports\n");
}

static void quirk_cmi8330_resources(struct pnp_dev *dev)
{
	struct pnp_option *res = dev->dependent;
	unsigned long tmp;

	for (; res; res = res->next) {

		struct pnp_irq *irq;
		struct pnp_dma *dma;

		for (irq = res->irq; irq; irq = irq->next) {	// Valid irqs are 5, 7, 10
			tmp = 0x04A0;
			bitmap_copy(irq->map, &tmp, 16);	// 0000 0100 1010 0000
		}

		for (dma = res->dma; dma; dma = dma->next)	// Valid 8bit dma channels are 1,3
			if ((dma->flags & IORESOURCE_DMA_TYPE_MASK) ==
			    IORESOURCE_DMA_8BIT)
				dma->map = 0x000A;
	}
	printk(KERN_INFO "pnp: CMI8330 quirk - fixing interrupts and dma\n");
}

static void quirk_sb16audio_resources(struct pnp_dev *dev)
{
	struct pnp_port *port;
	struct pnp_option *res = dev->dependent;
	int changed = 0;

	/*
	 * The default range on the mpu port for these devices is 0x388-0x388.
	 * Here we increase that range so that two such cards can be
	 * auto-configured.
	 */

	for (; res; res = res->next) {
		port = res->port;
		if (!port)
			continue;
		port = port->next;
		if (!port)
			continue;
		port = port->next;
		if (!port)
			continue;
		if (port->min != port->max)
			continue;
		port->max += 0x70;
		changed = 1;
	}
	if (changed)
		printk(KERN_INFO
		       "pnp: SB audio device quirk - increasing port range\n");
}


#include <linux/pci.h>

static void quirk_system_pci_resources(struct pnp_dev *dev)
{
	struct pci_dev *pdev = NULL;
	resource_size_t pnp_start, pnp_end, pci_start, pci_end;
	int i, j;

	/*
	 * Some BIOSes have PNP motherboard devices with resources that
	 * partially overlap PCI BARs.  The PNP system driver claims these
	 * motherboard resources, which prevents the normal PCI driver from
	 * requesting them later.
	 *
	 * This patch disables the PNP resources that conflict with PCI BARs
	 * so they won't be claimed by the PNP system driver.
	 */
	for_each_pci_dev(pdev) {
		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
			if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM) ||
			    pci_resource_len(pdev, i) == 0)
				continue;

			pci_start = pci_resource_start(pdev, i);
			pci_end = pci_resource_end(pdev, i);
			for (j = 0; j < PNP_MAX_MEM; j++) {
				if (!pnp_mem_valid(dev, j) ||
				    pnp_mem_len(dev, j) == 0)
					continue;

				pnp_start = pnp_mem_start(dev, j);
				pnp_end = pnp_mem_end(dev, j);

				/*
				 * If the PNP region doesn't overlap the PCI
				 * region at all, there's no problem.
				 */
				if (pnp_end < pci_start || pnp_start > pci_end)
					continue;

				/*
				 * If the PNP region completely encloses (or is
				 * at least as large as) the PCI region, that's
				 * also OK.  For example, this happens when the
				 * PNP device describes a bridge with PCI
				 * behind it.
				 */
				if (pnp_start <= pci_start &&
				    pnp_end >= pci_end)
					continue;

				/*
				 * Otherwise, the PNP region overlaps *part* of
				 * the PCI region, and that might prevent a PCI
				 * driver from requesting its resources.
				 */
				dev_warn(&dev->dev, "mem resource "
					"(0x%llx-0x%llx) overlaps %s BAR %d "
					"(0x%llx-0x%llx), disabling\n",
					(unsigned long long) pnp_start,
					(unsigned long long) pnp_end,
					pci_name(pdev), i,
					(unsigned long long) pci_start,
					(unsigned long long) pci_end);
				pnp_mem_flags(dev, j) = 0;
			}
		}
	}
}

/*
 *  PnP Quirks
 *  Cards or devices that need some tweaking due to incomplete resource info
 */

static struct pnp_fixup pnp_fixups[] = {
	/* Soundblaster awe io port quirk */
	{"CTL0021", quirk_awe32_resources},
	{"CTL0022", quirk_awe32_resources},
	{"CTL0023", quirk_awe32_resources},
	/* CMI 8330 interrupt and dma fix */
	{"@X@0001", quirk_cmi8330_resources},
	/* Soundblaster audio device io port range quirk */
	{"CTL0001", quirk_sb16audio_resources},
	{"CTL0031", quirk_sb16audio_resources},
	{"CTL0041", quirk_sb16audio_resources},
	{"CTL0042", quirk_sb16audio_resources},
	{"CTL0043", quirk_sb16audio_resources},
	{"CTL0044", quirk_sb16audio_resources},
	{"CTL0045", quirk_sb16audio_resources},
	{"PNP0c01", quirk_system_pci_resources},
	{"PNP0c02", quirk_system_pci_resources},
	{""}
};

void pnp_fixup_device(struct pnp_dev *dev)
{
	int i = 0;
	void (*quirk)(struct pnp_dev *);

	while (*pnp_fixups[i].id) {
		if (compare_pnp_id(dev->id, pnp_fixups[i].id)) {
			quirk = pnp_fixups[i].quirk_function;

#ifdef DEBUG
			dev_dbg(&dev->dev, "calling quirk 0x%p", quirk);
			print_fn_descriptor_symbol(": %s()\n",
				(unsigned long) *quirk);
#endif
			(*quirk)(dev);
		}
		i++;
	}
}