irq.c

linux 内核源代码

/*
 *	Low-Level PCI Support for PC -- Routing of Interrupts
 *
 *	(c) 1999--2000 Martin Mares <[e-mail]>
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/dmi.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/io_apic.h>
#include <linux/irq.h>
#include <linux/acpi.h>

#include "pci.h"

#define PIRQ_SIGNATURE	(('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
#define PIRQ_VERSION 0x0100

static int broken_hp_bios_irq9;
static int acer_tm360_irqrouting;

static struct irq_routing_table *pirq_table;

static int pirq_enable_irq(struct pci_dev *dev);

/*
 * Never use: 0, 1, 2 (timer, keyboard, and cascade)
 * Avoid using: 13, 14 and 15 (FP error and IDE).
 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
 */
unsigned int pcibios_irq_mask = 0xfff8;

static int pirq_penalty[16] = {
	1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
	0, 0, 0, 0, 1000, 100000, 100000, 100000
};

struct irq_router {
	char *name;
	u16 vendor, device;
	int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
	int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
};

struct irq_router_handler {
	u16 vendor;
	int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
};

int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
void (*pcibios_disable_irq)(struct pci_dev *dev) = NULL;

/*
 *  Check passed address for the PCI IRQ Routing Table signature
 *  and perform checksum verification.
 */

static inline struct irq_routing_table * pirq_check_routing_table(u8 *addr)
{
	struct irq_routing_table *rt;
	int i;
	u8 sum;

	rt = (struct irq_routing_table *) addr;
	if (rt->signature != PIRQ_SIGNATURE ||
	    rt->version != PIRQ_VERSION ||
	    rt->size % 16 ||
	    rt->size < sizeof(struct irq_routing_table))
		return NULL;
	sum = 0;
	for (i=0; i < rt->size; i++)
		sum += addr[i];
	if (!sum) {
		DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n", rt);
		return rt;
	}
	return NULL;
}



/*
 *  Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
 */

static struct irq_routing_table * __init pirq_find_routing_table(void)
{
	u8 *addr;
	struct irq_routing_table *rt;

	if (pirq_table_addr) {
		rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
		if (rt)
			return rt;
		printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
	}
	for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
		rt = pirq_check_routing_table(addr);
		if (rt)
			return rt;
	}
	return NULL;
}

/*
 *  If we have a IRQ routing table, use it to search for peer host
 *  bridges.  It's a gross hack, but since there are no other known
 *  ways how to get a list of buses, we have to go this way.
 */

static void __init pirq_peer_trick(void)
{
	struct irq_routing_table *rt = pirq_table;
	u8 busmap[256];
	int i;
	struct irq_info *e;

	memset(busmap, 0, sizeof(busmap));
	for(i=0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
		e = &rt->slots[i];
#ifdef DEBUG
		{
			int j;
			DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
			for(j=0; j<4; j++)
				DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
			DBG("\n");
		}
#endif
		busmap[e->bus] = 1;
	}
	for(i = 1; i < 256; i++) {
		if (!busmap[i] || pci_find_bus(0, i))
			continue;
		if (pci_scan_bus_with_sysdata(i))
			printk(KERN_INFO "PCI: Discovered primary peer "
			       "bus %02x [IRQ]\n", i);
	}
	pcibios_last_bus = -1;
}

/*
 *  Code for querying and setting of IRQ routes on various interrupt routers.
 */

void eisa_set_level_irq(unsigned int irq)
{
	unsigned char mask = 1 << (irq & 7);
	unsigned int port = 0x4d0 + (irq >> 3);
	unsigned char val;
	static u16 eisa_irq_mask;

	if (irq >= 16 || (1 << irq) & eisa_irq_mask)
		return;

	eisa_irq_mask |= (1 << irq);
	printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq);
	val = inb(port);
	if (!(val & mask)) {
		DBG(KERN_DEBUG " -> edge");
		outb(val | mask, port);
	}
}

/*
 * Common IRQ routing practice: nibbles in config space,
 * offset by some magic constant.
 */
static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
{
	u8 x;
	unsigned reg = offset + (nr >> 1);

	pci_read_config_byte(router, reg, &x);
	return (nr & 1) ? (x >> 4) : (x & 0xf);
}

static void write_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr, unsigned int val)
{
	u8 x;
	unsigned reg = offset + (nr >> 1);

	pci_read_config_byte(router, reg, &x);
	x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
	pci_write_config_byte(router, reg, x);
}

/*
 * ALI pirq entries are damn ugly, and completely undocumented.
 * This has been figured out from pirq tables, and it's not a pretty
 * picture.
 */
static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };

	return irqmap[read_config_nybble(router, 0x48, pirq-1)];
}

static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
	unsigned int val = irqmap[irq];
		
	if (val) {
		write_config_nybble(router, 0x48, pirq-1, val);
		return 1;
	}
	return 0;
}

/*
 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
 * just a pointer to the config space.
 */
static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	u8 x;

	pci_read_config_byte(router, pirq, &x);
	return (x < 16) ? x : 0;
}

static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	pci_write_config_byte(router, pirq, irq);
	return 1;
}

/*
 * The VIA pirq rules are nibble-based, like ALI,
 * but without the ugly irq number munging.
 * However, PIRQD is in the upper instead of lower 4 bits.
 */
static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
}

static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
	return 1;
}

/*
 * The VIA pirq rules are nibble-based, like ALI,
 * but without the ugly irq number munging.
 * However, for 82C586, nibble map is different .
 */
static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
	return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
}

static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
	write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
	return 1;
}

/*
 * ITE 8330G pirq rules are nibble-based
 * FIXME: pirqmap may be { 1, 0, 3, 2 },
 * 	  2+3 are both mapped to irq 9 on my system
 */
static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
	return read_config_nybble(router,0x43, pirqmap[pirq-1]);
}

static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
	write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
	return 1;
}

/*
 * OPTI: high four bits are nibble pointer..
 * I wonder what the low bits do?
 */
static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	return read_config_nybble(router, 0xb8, pirq >> 4);
}

static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	write_config_nybble(router, 0xb8, pirq >> 4, irq);
	return 1;
}

/*
 * Cyrix: nibble offset 0x5C
 * 0x5C bits 7:4 is INTB bits 3:0 is INTA 
 * 0x5D bits 7:4 is INTD bits 3:0 is INTC
 */
static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	return read_config_nybble(router, 0x5C, (pirq-1)^1);
}

static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
	return 1;
}

/*
 *	PIRQ routing for SiS 85C503 router used in several SiS chipsets.
 *	We have to deal with the following issues here:
 *	- vendors have different ideas about the meaning of link values
 *	- some onboard devices (integrated in the chipset) have special
 *	  links and are thus routed differently (i.e. not via PCI INTA-INTD)
 *	- different revision of the router have a different layout for
 *	  the routing registers, particularly for the onchip devices
 *
 *	For all routing registers the common thing is we have one byte
 *	per routeable link which is defined as:
 *		 bit 7      IRQ mapping enabled (0) or disabled (1)
 *		 bits [6:4] reserved (sometimes used for onchip devices)
 *		 bits [3:0] IRQ to map to
 *		     allowed: 3-7, 9-12, 14-15
 *		     reserved: 0, 1, 2, 8, 13
 *
 *	The config-space registers located at 0x41/0x42/0x43/0x44 are
 *	always used to route the normal PCI INT A/B/C/D respectively.
 *	Apparently there are systems implementing PCI routing table using
 *	link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
 *	We try our best to handle both link mappings.
 *	
 *	Currently (2003-05-21) it appears most SiS chipsets follow the
 *	definition of routing registers from the SiS-5595 southbridge.
 *	According to the SiS 5595 datasheets the revision id's of the
 *	router (ISA-bridge) should be 0x01 or 0xb0.
 *
 *	Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
 *	Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
 *	They seem to work with the current routing code. However there is
 *	some concern because of the two USB-OHCI HCs (original SiS 5595
 *	had only one). YMMV.
 *
 *	Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
 *
 *	0x61:	IDEIRQ:
 *		bits [6:5] must be written 01
 *		bit 4 channel-select primary (0), secondary (1)
 *
 *	0x62:	USBIRQ:
 *		bit 6 OHCI function disabled (0), enabled (1)
 *	
 *	0x6a:	ACPI/SCI IRQ: bits 4-6 reserved
 *
 *	0x7e:	Data Acq. Module IRQ - bits 4-6 reserved
 *
 *	We support USBIRQ (in addition to INTA-INTD) and keep the
 *	IDE, ACPI and DAQ routing untouched as set by the BIOS.
 *
 *	Currently the only reported exception is the new SiS 65x chipset
 *	which includes the SiS 69x southbridge. Here we have the 85C503
 *	router revision 0x04 and there are changes in the register layout
 *	mostly related to the different USB HCs with USB 2.0 support.
 *
 *	Onchip routing for router rev-id 0x04 (try-and-error observation)
 *
 *	0x60/0x61/0x62/0x63:	1xEHCI and 3xOHCI (companion) USB-HCs
 *				bit 6-4 are probably unused, not like 5595
 */

#define PIRQ_SIS_IRQ_MASK	0x0f
#define PIRQ_SIS_IRQ_DISABLE	0x80
#define PIRQ_SIS_USB_ENABLE	0x40

static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
	u8 x;
	int reg;

	reg = pirq;
	if (reg >= 0x01 && reg <= 0x04)
		reg += 0x40;
	pci_read_config_byte(router, reg, &x);
	return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
}

static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
	u8 x;
	int reg;

	reg = pirq;
	if (reg >= 0x01 && reg <= 0x04)
		reg += 0x40;
	pci_read_config_byte(router, reg, &x);
	x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);