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linux/arch/x86/pci/irq.c
Maciej W. Rozycki c25f23459c x86/PCI: Fix coding style in PIRQ table verification 
Remove an extraneous space with a cast in `pirq_check_routing_table'.

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2203310017260.44113@angie.orcam.me.uk
2022-04-10 12:48:15 +02:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Low-Level PCI Support for PC -- Routing of Interrupts
*
* (c) 1999--2000 Martin Mares <mj@ucw.cz>
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/dmi.h>
#include <linux/io.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <asm/io_apic.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <asm/i8259.h>
#include <asm/pc-conf-reg.h>
#include <asm/pci_x86.h>
#define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
#define PIRQ_VERSION 0x0100
#define IRT_SIGNATURE (('$' << 0) + ('I' << 8) + ('R' << 16) + ('T' << 24))
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);
static void pirq_disable_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);
int (*lvl)(struct pci_dev *router, struct pci_dev *dev, int pirq,
int irq);
};
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) = pirq_enable_irq;
void (*pcibios_disable_irq)(struct pci_dev *dev) = pirq_disable_irq;
/*
* 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,
u8 *limit)
{
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) ||
(limit && rt->size > limit - addr))
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%lx\n",
__pa(rt));
return rt;
}
return NULL;
}
/*
* Handle the $IRT PCI IRQ Routing Table format used by AMI for its BCP
* (BIOS Configuration Program) external tool meant for tweaking BIOS
* structures without the need to rebuild it from sources. The $IRT
* format has been invented by AMI before Microsoft has come up with its
* $PIR format and a $IRT table is therefore there in some systems that
* lack a $PIR table.
*
* It uses the same PCI BIOS 2.1 format for interrupt routing entries
* themselves but has a different simpler header prepended instead,
* occupying 8 bytes, where a `$IRT' signature is followed by one byte
* specifying the total number of interrupt routing entries allocated in
* the table, then one byte specifying the actual number of entries used
* (which the BCP tool can take advantage of when modifying the table),
* and finally a 16-bit word giving the IRQs devoted exclusively to PCI.
* Unlike with the $PIR table there is no alignment guarantee.
*
* Given the similarity of the two formats the $IRT one is trivial to
* convert to the $PIR one, which we do here, except that obviously we
* have no information as to the router device to use, but we can handle
* it by matching PCI device IDs actually seen on the bus against ones
* that our individual routers recognise.
*
* Reportedly there is another $IRT table format where a 16-bit word
* follows the header instead that points to interrupt routing entries
* in a $PIR table provided elsewhere. In that case this code will not
* be reached though as the $PIR table will have been chosen instead.
*/
static inline struct irq_routing_table *pirq_convert_irt_table(u8 *addr,
u8 *limit)
{
struct irt_routing_table *ir;
struct irq_routing_table *rt;
u16 size;
u8 sum;
int i;
ir = (struct irt_routing_table *)addr;
if (ir->signature != IRT_SIGNATURE || !ir->used || ir->size < ir->used)
return NULL;
size = sizeof(*ir) + ir->used * sizeof(ir->slots[0]);
if (size > limit - addr)
return NULL;
DBG(KERN_DEBUG "PCI: $IRT Interrupt Routing Table found at 0x%lx\n",
__pa(ir));
size = sizeof(*rt) + ir->used * sizeof(rt->slots[0]);
rt = kzalloc(size, GFP_KERNEL);
if (!rt)
return NULL;
rt->signature = PIRQ_SIGNATURE;
rt->version = PIRQ_VERSION;
rt->size = size;
rt->exclusive_irqs = ir->exclusive_irqs;
for (i = 0; i < ir->used; i++)
rt->slots[i] = ir->slots[i];
addr = (u8 *)rt;
sum = 0;
for (i = 0; i < size; i++)
sum += addr[i];
rt->checksum = -sum;
return rt;
}
/*
* Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
*/
static struct irq_routing_table * __init pirq_find_routing_table(void)
{
u8 * const bios_start = (u8 *)__va(0xf0000);
u8 * const bios_end = (u8 *)__va(0x100000);
u8 *addr;
struct irq_routing_table *rt;
if (pirq_table_addr) {
rt = pirq_check_routing_table((u8 *)__va(pirq_table_addr),
NULL);
if (rt)
return rt;
printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
}
for (addr = bios_start;
addr < bios_end - sizeof(struct irq_routing_table);
addr += 16) {
rt = pirq_check_routing_table(addr, bios_end);
if (rt)
return rt;
}
for (addr = bios_start;
addr < bios_end - sizeof(struct irt_routing_table);
addr++) {
rt = pirq_convert_irt_table(addr, bios_end);
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.%x slot=%02x",
e->bus, e->devfn / 8, 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;
pcibios_scan_root(i);
}
pcibios_last_bus = -1;
}
/*
* Code for querying and setting of IRQ routes on various interrupt routers.
* PIC Edge/Level Control Registers (ELCR) 0x4d0 & 0x4d1.
*/
void elcr_set_level_irq(unsigned int irq)
{
unsigned char mask = 1 << (irq & 7);
unsigned int port = PIC_ELCR1 + (irq >> 3);
unsigned char val;
static u16 elcr_irq_mask;
if (irq >= 16 || (1 << irq) & elcr_irq_mask)
return;
elcr_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);
}
}
/*
* PIRQ routing for the M1487 ISA Bus Controller (IBC) ASIC used
* with the ALi FinALi 486 chipset. The IBC is not decoded in the
* PCI configuration space, so we identify it by the accompanying
* M1489 Cache-Memory PCI Controller (CMP) ASIC.
*
* There are four 4-bit mappings provided, spread across two PCI
* INTx Routing Table Mapping Registers, available in the port I/O
* space accessible indirectly via the index/data register pair at
* 0x22/0x23, located at indices 0x42 and 0x43 for the INT1/INT2
* and INT3/INT4 lines respectively. The INT1/INT3 and INT2/INT4
* lines are mapped in the low and the high 4-bit nibble of the
* corresponding register as follows:
*
* 0000 : Disabled
* 0001 : IRQ9
* 0010 : IRQ3
* 0011 : IRQ10
* 0100 : IRQ4
* 0101 : IRQ5
* 0110 : IRQ7
* 0111 : IRQ6
* 1000 : Reserved
* 1001 : IRQ11
* 1010 : Reserved
* 1011 : IRQ12
* 1100 : Reserved
* 1101 : IRQ14
* 1110 : Reserved
* 1111 : IRQ15
*
* In addition to the usual ELCR register pair there is a separate
* PCI INTx Sensitivity Register at index 0x44 in the same port I/O
* space, whose bits 3:0 select the trigger mode for INT[4:1] lines
* respectively. Any bit set to 1 causes interrupts coming on the
* corresponding line to be passed to ISA as edge-triggered and
* otherwise they are passed as level-triggered. Manufacturer's
* documentation says this register has to be set consistently with
* the relevant ELCR register.
*
* Accesses to the port I/O space concerned here need to be unlocked
* by writing the value of 0xc5 to the Lock Register at index 0x03
* beforehand. Any other value written to said register prevents
* further accesses from reaching the register file, except for the
* Lock Register being written with 0xc5 again.
*
* References:
*
* "M1489/M1487: 486 PCI Chip Set", Version 1.2, Acer Laboratories
* Inc., July 1997
*/
#define PC_CONF_FINALI_LOCK 0x03u
#define PC_CONF_FINALI_PCI_INTX_RT1 0x42u
#define PC_CONF_FINALI_PCI_INTX_RT2 0x43u
#define PC_CONF_FINALI_PCI_INTX_SENS 0x44u
#define PC_CONF_FINALI_LOCK_KEY 0xc5u
static u8 read_pc_conf_nybble(u8 base, u8 index)
{
u8 reg = base + (index >> 1);
u8 x;
x = pc_conf_get(reg);
return index & 1 ? x >> 4 : x & 0xf;
}
static void write_pc_conf_nybble(u8 base, u8 index, u8 val)
{
u8 reg = base + (index >> 1);
u8 x;
x = pc_conf_get(reg);
x = index & 1 ? (x & 0x0f) | (val << 4) : (x & 0xf0) | val;
pc_conf_set(reg, x);
}
/*
* FinALi pirq rules are as follows:
*
* - bit 0 selects between INTx Routing Table Mapping Registers,
*
* - bit 3 selects the nibble within the INTx Routing Table Mapping Register,
*
* - bits 7:4 map to bits 3:0 of the PCI INTx Sensitivity Register.
*/
static int pirq_finali_get(struct pci_dev *router, struct pci_dev *dev,
int pirq)
{
static const u8 irqmap[16] = {
0, 9, 3, 10, 4, 5, 7, 6, 0, 11, 0, 12, 0, 14, 0, 15
};
unsigned long flags;
u8 index;
u8 x;
index = (pirq & 1) << 1 | (pirq & 8) >> 3;
raw_spin_lock_irqsave(&pc_conf_lock, flags);
pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY);
x = irqmap[read_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, index)];
pc_conf_set(PC_CONF_FINALI_LOCK, 0);
raw_spin_unlock_irqrestore(&pc_conf_lock, flags);
return x;
}
static int pirq_finali_set(struct pci_dev *router, struct pci_dev *dev,
int pirq, int irq)
{
static const u8 irqmap[16] = {
0, 0, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15
};
u8 val = irqmap[irq];
unsigned long flags;
u8 index;
if (!val)
return 0;
index = (pirq & 1) << 1 | (pirq & 8) >> 3;
raw_spin_lock_irqsave(&pc_conf_lock, flags);
pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY);
write_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, index, val);
pc_conf_set(PC_CONF_FINALI_LOCK, 0);
raw_spin_unlock_irqrestore(&pc_conf_lock, flags);
return 1;
}
static int pirq_finali_lvl(struct pci_dev *router, struct pci_dev *dev,
int pirq, int irq)
{
u8 mask = ~((pirq & 0xf0u) >> 4);
unsigned long flags;
u8 trig;
elcr_set_level_irq(irq);
raw_spin_lock_irqsave(&pc_conf_lock, flags);
pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY);
trig = pc_conf_get(PC_CONF_FINALI_PCI_INTX_SENS);
trig &= mask;
pc_conf_set(PC_CONF_FINALI_PCI_INTX_SENS, trig);
pc_conf_set(PC_CONF_FINALI_LOCK, 0);
raw_spin_unlock_irqrestore(&pc_conf_lock, flags);
return 1;
}
/*
* 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 };
WARN_ON_ONCE(pirq > 16);
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];
WARN_ON_ONCE(pirq > 16);
if (val) {
write_config_nybble(router, 0x48, pirq-1, val);
return 1;
}
return 0;
}
/*
* PIRQ routing for the 82374EB/82374SB EISA System Component (ESC)
* ASIC used with the Intel 82420 and 82430 PCIsets. The ESC is not
* decoded in the PCI configuration space, so we identify it by the
* accompanying 82375EB/82375SB PCI-EISA Bridge (PCEB) ASIC.
*
* There are four PIRQ Route Control registers, available in the
* port I/O space accessible indirectly via the index/data register
* pair at 0x22/0x23, located at indices 0x60/0x61/0x62/0x63 for the
* PIRQ0/1/2/3# lines respectively. The semantics is the same as
* with the PIIX router.
*
* Accesses to the port I/O space concerned here need to be unlocked
* by writing the value of 0x0f to the ESC ID Register at index 0x02
* beforehand. Any other value written to said register prevents
* further accesses from reaching the register file, except for the
* ESC ID Register being written with 0x0f again.
*
* References:
*
* "82374EB/82374SB EISA System Component (ESC)", Intel Corporation,
* Order Number: 290476-004, March 1996
*
* "82375EB/82375SB PCI-EISA Bridge (PCEB)", Intel Corporation, Order
* Number: 290477-004, March 1996
*/
#define PC_CONF_I82374_ESC_ID 0x02u
#define PC_CONF_I82374_PIRQ_ROUTE_CONTROL 0x60u
#define PC_CONF_I82374_ESC_ID_KEY 0x0fu
static int pirq_esc_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
unsigned long flags;
int reg;
u8 x;
reg = pirq;
if (reg >= 1 && reg <= 4)
reg += PC_CONF_I82374_PIRQ_ROUTE_CONTROL - 1;
raw_spin_lock_irqsave(&pc_conf_lock, flags);
pc_conf_set(PC_CONF_I82374_ESC_ID, PC_CONF_I82374_ESC_ID_KEY);
x = pc_conf_get(reg);
pc_conf_set(PC_CONF_I82374_ESC_ID, 0);
raw_spin_unlock_irqrestore(&pc_conf_lock, flags);
return (x < 16) ? x : 0;
}
static int pirq_esc_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
int irq)
{
unsigned long flags;
int reg;
reg = pirq;
if (reg >= 1 && reg <= 4)
reg += PC_CONF_I82374_PIRQ_ROUTE_CONTROL - 1;
raw_spin_lock_irqsave(&pc_conf_lock, flags);
pc_conf_set(PC_CONF_I82374_ESC_ID, PC_CONF_I82374_ESC_ID_KEY);
pc_conf_set(reg, irq);
pc_conf_set(PC_CONF_I82374_ESC_ID, 0);
raw_spin_unlock_irqrestore(&pc_conf_lock, flags);
return 1;
}
/*
* 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;
}
/*
* PIRQ routing for the 82426EX ISA Bridge (IB) ASIC used with the
* Intel 82420EX PCIset.
*
* There are only two PIRQ Route Control registers, available in the
* combined 82425EX/82426EX PCI configuration space, at 0x66 and 0x67
* for the PIRQ0# and PIRQ1# lines respectively. The semantics is
* the same as with the PIIX router.
*
* References:
*
* "82420EX PCIset Data Sheet, 82425EX PCI System Controller (PSC)
* and 82426EX ISA Bridge (IB)", Intel Corporation, Order Number:
* 290488-004, December 1995
*/
#define PCI_I82426EX_PIRQ_ROUTE_CONTROL 0x66u
static int pirq_ib_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
int reg;
u8 x;
reg = pirq;
if (reg >= 1 && reg <= 2)
reg += PCI_I82426EX_PIRQ_ROUTE_CONTROL - 1;
pci_read_config_byte(router, reg, &x);
return (x < 16) ? x : 0;
}
static int pirq_ib_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
int irq)
{
int reg;
reg = pirq;
if (reg >= 1 && reg <= 2)
reg += PCI_I82426EX_PIRQ_ROUTE_CONTROL - 1;
pci_write_config_byte(router, reg, 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 };
WARN_ON_ONCE(pirq > 5);
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 };
WARN_ON_ONCE(pirq > 5);
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 };
WARN_ON_ONCE(pirq > 4);
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 };
WARN_ON_ONCE(pirq > 4);
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 the SiS85C497 AT Bus Controller & Megacell (ATM)
* ISA bridge used with the SiS 85C496/497 486 Green PC VESA/ISA/PCI
* Chipset.
*
* There are four PCI INTx#-to-IRQ Link registers provided in the
* SiS85C497 part of the peculiar combined 85C496/497 configuration
* space decoded by the SiS85C496 PCI & CPU Memory Controller (PCM)
* host bridge, at 0xc0/0xc1/0xc2/0xc3 respectively for the PCI INT
* A/B/C/D lines. Bit 7 enables the respective link if set and bits
* 3:0 select the 8259A IRQ line as follows:
*
* 0000 : Reserved
* 0001 : Reserved
* 0010 : Reserved
* 0011 : IRQ3
* 0100 : IRQ4
* 0101 : IRQ5
* 0110 : IRQ6
* 0111 : IRQ7
* 1000 : Reserved
* 1001 : IRQ9
* 1010 : IRQ10
* 1011 : IRQ11
* 1100 : IRQ12
* 1101 : Reserved
* 1110 : IRQ14
* 1111 : IRQ15
*
* We avoid using a reserved value for disabled links, hence the
* choice of IRQ15 for that case.
*
* References:
*
* "486 Green PC VESA/ISA/PCI Chipset, SiS 85C496/497", Rev 3.0,
* Silicon Integrated Systems Corp., July 1995
*/
#define PCI_SIS497_INTA_TO_IRQ_LINK 0xc0u
#define PIRQ_SIS497_IRQ_MASK 0x0fu
#define PIRQ_SIS497_IRQ_ENABLE 0x80u
static int pirq_sis497_get(struct pci_dev *router, struct pci_dev *dev,
int pirq)
{
int reg;
u8 x;
reg = pirq;
if (reg >= 1 && reg <= 4)
reg += PCI_SIS497_INTA_TO_IRQ_LINK - 1;
pci_read_config_byte(router, reg, &x);
return (x & PIRQ_SIS497_IRQ_ENABLE) ? (x & PIRQ_SIS497_IRQ_MASK) : 0;
}
static int pirq_sis497_set(struct pci_dev *router, struct pci_dev *dev,
int pirq, int irq)
{
int reg;
u8 x;
reg = pirq;
if (reg >= 1 && reg <= 4)
reg += PCI_SIS497_INTA_TO_IRQ_LINK - 1;
pci_read_config_byte(router, reg, &x);
x &= ~(PIRQ_SIS497_IRQ_MASK | PIRQ_SIS497_IRQ_ENABLE);
x |= irq ? (PIRQ_SIS497_IRQ_ENABLE | irq) : PIRQ_SIS497_IRQ_MASK;
pci_write_config_byte(router, reg, x);
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_SIS503_IRQ_MASK 0x0f
#define PIRQ_SIS503_IRQ_DISABLE 0x80
#define PIRQ_SIS503_USB_ENABLE 0x40
static int pirq_sis503_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_SIS503_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS503_IRQ_MASK);
}
static int pirq_sis503_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_SIS503_IRQ_MASK | PIRQ_SIS503_IRQ_DISABLE);
x |= irq ? irq : PIRQ_SIS503_IRQ_DISABLE;
pci_write_config_byte(router, reg, x);
return 1;
}
/*
* VLSI: nibble offset 0x74 - educated guess due to routing table and
* config space of VLSI 82C534 PCI-bridge/router (1004:0102)
* Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
* devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
* for the busbridge to the docking station.
*/
static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
WARN_ON_ONCE(pirq >= 9);
if (pirq > 8) {
dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
return 0;
}
return read_config_nybble(router, 0x74, pirq-1);
}
static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
WARN_ON_ONCE(pirq >= 9);
if (pirq > 8) {
dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
return 0;
}
write_config_nybble(router, 0x74, pirq-1, irq);
return 1;
}
/*
* ServerWorks: PCI interrupts mapped to system IRQ lines through Index
* and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
* format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
* register is a straight binary coding of desired PIC IRQ (low nibble).
*
* The 'link' value in the PIRQ table is already in the correct format
* for the Index register. There are some special index values:
* 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
* and 0x03 for SMBus.
*/
static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
outb(pirq, 0xc00);
return inb(0xc01) & 0xf;
}
static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev,
int pirq, int irq)
{
outb(pirq, 0xc00);
outb(irq, 0xc01);
return 1;
}
/* Support for AMD756 PCI IRQ Routing
* Jhon H. Caicedo <jhcaiced@osso.org.co>
* Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
* Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
* The AMD756 pirq rules are nibble-based
* offset 0x56 0-3 PIRQA 4-7 PIRQB
* offset 0x57 0-3 PIRQC 4-7 PIRQD
*/
static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
u8 irq;
irq = 0;
if (pirq <= 4)
irq = read_config_nybble(router, 0x56, pirq - 1);
dev_info(&dev->dev,
"AMD756: dev [%04x:%04x], router PIRQ %d get IRQ %d\n",
dev->vendor, dev->device, pirq, irq);
return irq;
}
static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
dev_info(&dev->dev,
"AMD756: dev [%04x:%04x], router PIRQ %d set IRQ %d\n",
dev->vendor, dev->device, pirq, irq);
if (pirq <= 4)
write_config_nybble(router, 0x56, pirq - 1, irq);
return 1;
}
/*
* PicoPower PT86C523
*/
static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
outb(0x10 + ((pirq - 1) >> 1), 0x24);
return ((pirq - 1) & 1) ? (inb(0x26) >> 4) : (inb(0x26) & 0xf);
}
static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
int irq)
{
unsigned int x;
outb(0x10 + ((pirq - 1) >> 1), 0x24);
x = inb(0x26);
x = ((pirq - 1) & 1) ? ((x & 0x0f) | (irq << 4)) : ((x & 0xf0) | (irq));
outb(x, 0x26);
return 1;
}
#ifdef CONFIG_PCI_BIOS
static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
struct pci_dev *bridge;
int pin = pci_get_interrupt_pin(dev, &bridge);
return pcibios_set_irq_routing(bridge, pin - 1, irq);
}
#endif
static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
static struct pci_device_id __initdata pirq_440gx[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
{ },
};
/* 440GX has a proprietary PIRQ router -- don't use it */
if (pci_dev_present(pirq_440gx))
return 0;
switch (device) {
case PCI_DEVICE_ID_INTEL_82375:
r->name = "PCEB/ESC";
r->get = pirq_esc_get;
r->set = pirq_esc_set;
return 1;
case PCI_DEVICE_ID_INTEL_82371FB_0:
case PCI_DEVICE_ID_INTEL_82371SB_0:
case PCI_DEVICE_ID_INTEL_82371AB_0:
case PCI_DEVICE_ID_INTEL_82371MX:
case PCI_DEVICE_ID_INTEL_82443MX_0:
case PCI_DEVICE_ID_INTEL_82801AA_0:
case PCI_DEVICE_ID_INTEL_82801AB_0:
case PCI_DEVICE_ID_INTEL_82801BA_0:
case PCI_DEVICE_ID_INTEL_82801BA_10:
case PCI_DEVICE_ID_INTEL_82801CA_0:
case PCI_DEVICE_ID_INTEL_82801CA_12:
case PCI_DEVICE_ID_INTEL_82801DB_0:
case PCI_DEVICE_ID_INTEL_82801E_0:
case PCI_DEVICE_ID_INTEL_82801EB_0:
case PCI_DEVICE_ID_INTEL_ESB_1:
case PCI_DEVICE_ID_INTEL_ICH6_0:
case PCI_DEVICE_ID_INTEL_ICH6_1:
case PCI_DEVICE_ID_INTEL_ICH7_0:
case PCI_DEVICE_ID_INTEL_ICH7_1:
case PCI_DEVICE_ID_INTEL_ICH7_30:
case PCI_DEVICE_ID_INTEL_ICH7_31:
case PCI_DEVICE_ID_INTEL_TGP_LPC:
case PCI_DEVICE_ID_INTEL_ESB2_0:
case PCI_DEVICE_ID_INTEL_ICH8_0:
case PCI_DEVICE_ID_INTEL_ICH8_1:
case PCI_DEVICE_ID_INTEL_ICH8_2:
case PCI_DEVICE_ID_INTEL_ICH8_3:
case PCI_DEVICE_ID_INTEL_ICH8_4:
case PCI_DEVICE_ID_INTEL_ICH9_0:
case PCI_DEVICE_ID_INTEL_ICH9_1:
case PCI_DEVICE_ID_INTEL_ICH9_2:
case PCI_DEVICE_ID_INTEL_ICH9_3:
case PCI_DEVICE_ID_INTEL_ICH9_4:
case PCI_DEVICE_ID_INTEL_ICH9_5:
case PCI_DEVICE_ID_INTEL_EP80579_0:
case PCI_DEVICE_ID_INTEL_ICH10_0:
case PCI_DEVICE_ID_INTEL_ICH10_1:
case PCI_DEVICE_ID_INTEL_ICH10_2:
case PCI_DEVICE_ID_INTEL_ICH10_3:
case PCI_DEVICE_ID_INTEL_PATSBURG_LPC_0:
case PCI_DEVICE_ID_INTEL_PATSBURG_LPC_1:
r->name = "PIIX/ICH";
r->get = pirq_piix_get;
r->set = pirq_piix_set;
return 1;
case PCI_DEVICE_ID_INTEL_82425:
r->name = "PSC/IB";
r->get = pirq_ib_get;
r->set = pirq_ib_set;
return 1;
}
if ((device >= PCI_DEVICE_ID_INTEL_5_3400_SERIES_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_5_3400_SERIES_LPC_MAX)
|| (device >= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MAX)
|| (device >= PCI_DEVICE_ID_INTEL_DH89XXCC_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_DH89XXCC_LPC_MAX)
|| (device >= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MIN &&
device <= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MAX)) {
r->name = "PIIX/ICH";
r->get = pirq_piix_get;
r->set = pirq_piix_set;
return 1;
}
return 0;
}
static __init int via_router_probe(struct irq_router *r,
struct pci_dev *router, u16 device)
{
/* FIXME: We should move some of the quirk fixup stuff here */
/*
* workarounds for some buggy BIOSes
*/
if (device == PCI_DEVICE_ID_VIA_82C586_0) {
switch (router->device) {
case PCI_DEVICE_ID_VIA_82C686:
/*
* Asus k7m bios wrongly reports 82C686A
* as 586-compatible
*/
device = PCI_DEVICE_ID_VIA_82C686;
break;
case PCI_DEVICE_ID_VIA_8235:
/**
* Asus a7v-x bios wrongly reports 8235
* as 586-compatible
*/
device = PCI_DEVICE_ID_VIA_8235;
break;
case PCI_DEVICE_ID_VIA_8237:
/**
* Asus a7v600 bios wrongly reports 8237
* as 586-compatible
*/
device = PCI_DEVICE_ID_VIA_8237;
break;
}
}
switch (device) {
case PCI_DEVICE_ID_VIA_82C586_0:
r->name = "VIA";
r->get = pirq_via586_get;
r->set = pirq_via586_set;
return 1;
case PCI_DEVICE_ID_VIA_82C596:
case PCI_DEVICE_ID_VIA_82C686:
case PCI_DEVICE_ID_VIA_8231:
case PCI_DEVICE_ID_VIA_8233A:
case PCI_DEVICE_ID_VIA_8235:
case PCI_DEVICE_ID_VIA_8237:
/* FIXME: add new ones for 8233/5 */
r->name = "VIA";
r->get = pirq_via_get;
r->set = pirq_via_set;
return 1;
}
return 0;
}
static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_VLSI_82C534:
r->name = "VLSI 82C534";
r->get = pirq_vlsi_get;
r->set = pirq_vlsi_set;
return 1;
}
return 0;
}
static __init int serverworks_router_probe(struct irq_router *r,
struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_SERVERWORKS_OSB4:
case PCI_DEVICE_ID_SERVERWORKS_CSB5:
r->name = "ServerWorks";
r->get = pirq_serverworks_get;
r->set = pirq_serverworks_set;
return 1;
}
return 0;
}
static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_SI_496:
r->name = "SiS85C497";
r->get = pirq_sis497_get;
r->set = pirq_sis497_set;
return 1;
case PCI_DEVICE_ID_SI_503:
r->name = "SiS85C503";
r->get = pirq_sis503_get;
r->set = pirq_sis503_set;
return 1;
}
return 0;
}
static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_CYRIX_5520:
r->name = "NatSemi";
r->get = pirq_cyrix_get;
r->set = pirq_cyrix_set;
return 1;
}
return 0;
}
static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_OPTI_82C700:
r->name = "OPTI";
r->get = pirq_opti_get;
r->set = pirq_opti_set;
return 1;
}
return 0;
}
static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_ITE_IT8330G_0:
r->name = "ITE";
r->get = pirq_ite_get;
r->set = pirq_ite_set;
return 1;
}
return 0;
}
static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_AL_M1489:
r->name = "FinALi";
r->get = pirq_finali_get;
r->set = pirq_finali_set;
r->lvl = pirq_finali_lvl;
return 1;
case PCI_DEVICE_ID_AL_M1533:
case PCI_DEVICE_ID_AL_M1563:
r->name = "ALI";
r->get = pirq_ali_get;
r->set = pirq_ali_set;
return 1;
}
return 0;
}
static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_AMD_VIPER_740B:
r->name = "AMD756";
break;
case PCI_DEVICE_ID_AMD_VIPER_7413:
r->name = "AMD766";
break;
case PCI_DEVICE_ID_AMD_VIPER_7443:
r->name = "AMD768";
break;
default:
return 0;
}
r->get = pirq_amd756_get;
r->set = pirq_amd756_set;
return 1;
}
static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
{
switch (device) {
case PCI_DEVICE_ID_PICOPOWER_PT86C523:
r->name = "PicoPower PT86C523";
r->get = pirq_pico_get;
r->set = pirq_pico_set;
return 1;
case PCI_DEVICE_ID_PICOPOWER_PT86C523BBP:
r->name = "PicoPower PT86C523 rev. BB+";
r->get = pirq_pico_get;
r->set = pirq_pico_set;
return 1;
}
return 0;
}
static __initdata struct irq_router_handler pirq_routers[] = {
{ PCI_VENDOR_ID_INTEL, intel_router_probe },
{ PCI_VENDOR_ID_AL, ali_router_probe },
{ PCI_VENDOR_ID_ITE, ite_router_probe },
{ PCI_VENDOR_ID_VIA, via_router_probe },
{ PCI_VENDOR_ID_OPTI, opti_router_probe },
{ PCI_VENDOR_ID_SI, sis_router_probe },
{ PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
{ PCI_VENDOR_ID_VLSI, vlsi_router_probe },
{ PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
{ PCI_VENDOR_ID_AMD, amd_router_probe },
{ PCI_VENDOR_ID_PICOPOWER, pico_router_probe },
/* Someone with docs needs to add the ATI Radeon IGP */
{ 0, NULL }
};
static struct irq_router pirq_router;
static struct pci_dev *pirq_router_dev;
/*
* FIXME: should we have an option to say "generic for
* chipset" ?
*/
static bool __init pirq_try_router(struct irq_router *r,
struct irq_routing_table *rt,
struct pci_dev *dev)
{
struct irq_router_handler *h;
DBG(KERN_DEBUG "PCI: Trying IRQ router for [%04x:%04x]\n",
dev->vendor, dev->device);
for (h = pirq_routers; h->vendor; h++) {
/* First look for a router match */
if (rt->rtr_vendor == h->vendor &&
h->probe(r, dev, rt->rtr_device))
return true;
/* Fall back to a device match */
if (dev->vendor == h->vendor &&
h->probe(r, dev, dev->device))
return true;
}
return false;
}
static void __init pirq_find_router(struct irq_router *r)
{
struct irq_routing_table *rt = pirq_table;
struct pci_dev *dev;
#ifdef CONFIG_PCI_BIOS
if (!rt->signature) {
printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
r->set = pirq_bios_set;
r->name = "BIOS";
return;
}
#endif
/* Default unless a driver reloads it */
r->name = "default";
r->get = NULL;
r->set = NULL;
DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for [%04x:%04x]\n",
rt->rtr_vendor, rt->rtr_device);
/* Use any vendor:device provided by the routing table or try all. */
if (rt->rtr_vendor) {
dev = pci_get_domain_bus_and_slot(0, rt->rtr_bus,
rt->rtr_devfn);
if (dev && pirq_try_router(r, rt, dev))
pirq_router_dev = dev;
} else {
dev = NULL;
for_each_pci_dev(dev) {
if (pirq_try_router(r, rt, dev)) {
pirq_router_dev = dev;
break;
}
}
}
if (pirq_router_dev)
dev_info(&pirq_router_dev->dev, "%s IRQ router [%04x:%04x]\n",
pirq_router.name,
pirq_router_dev->vendor, pirq_router_dev->device);
else
DBG(KERN_DEBUG "PCI: Interrupt router not found at "
"%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
/* The device remains referenced for the kernel lifetime */
}
/*
* We're supposed to match on the PCI device only and not the function,
* but some BIOSes build their tables with the PCI function included
* for motherboard devices, so if a complete match is found, then give
* it precedence over a slot match.
*/
static struct irq_info *pirq_get_dev_info(struct pci_dev *dev)
{
struct irq_routing_table *rt = pirq_table;
int entries = (rt->size - sizeof(struct irq_routing_table)) /
sizeof(struct irq_info);
struct irq_info *slotinfo = NULL;
struct irq_info *info;
for (info = rt->slots; entries--; info++)
if (info->bus == dev->bus->number) {
if (info->devfn == dev->devfn)
return info;
if (!slotinfo &&
PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
slotinfo = info;
}
return slotinfo;
}
/*
* Buses behind bridges are typically not listed in the PIRQ routing table.
* Do the usual dance then and walk the tree of bridges up adjusting the
* pin number accordingly on the way until the originating root bus device
* has been reached and then use its routing information.
*/
static struct irq_info *pirq_get_info(struct pci_dev *dev, u8 *pin)
{
struct pci_dev *temp_dev = dev;
struct irq_info *info;
u8 temp_pin = *pin;
u8 dpin = temp_pin;
info = pirq_get_dev_info(dev);
while (!info && temp_dev->bus->parent) {
struct pci_dev *bridge = temp_dev->bus->self;
temp_pin = pci_swizzle_interrupt_pin(temp_dev, temp_pin);
info = pirq_get_dev_info(bridge);
if (info)
dev_warn(&dev->dev,
"using bridge %s INT %c to get INT %c\n",
pci_name(bridge),
'A' + temp_pin - 1, 'A' + dpin - 1);
temp_dev = bridge;
}
*pin = temp_pin;
return info;
}
static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
{
struct irq_info *info;
int i, pirq, newirq;
u8 dpin, pin;
int irq = 0;
u32 mask;
struct irq_router *r = &pirq_router;
struct pci_dev *dev2 = NULL;
char *msg = NULL;
/* Find IRQ pin */
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &dpin);
if (!dpin) {
dev_dbg(&dev->dev, "no interrupt pin\n");
return 0;
}
if (io_apic_assign_pci_irqs)
return 0;
/* Find IRQ routing entry */
if (!pirq_table)
return 0;
pin = dpin;
info = pirq_get_info(dev, &pin);
if (!info) {
dev_dbg(&dev->dev, "PCI INT %c not found in routing table\n",
'A' + dpin - 1);
return 0;
}
pirq = info->irq[pin - 1].link;
mask = info->irq[pin - 1].bitmap;
if (!pirq) {
dev_dbg(&dev->dev, "PCI INT %c not routed\n", 'A' + dpin - 1);
return 0;
}
dev_dbg(&dev->dev, "PCI INT %c -> PIRQ %02x, mask %04x, excl %04x",
'A' + dpin - 1, pirq, mask, pirq_table->exclusive_irqs);
mask &= pcibios_irq_mask;
/* Work around broken HP Pavilion Notebooks which assign USB to
IRQ 9 even though it is actually wired to IRQ 11 */
if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
dev->irq = 11;
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
r->set(pirq_router_dev, dev, pirq, 11);
}
/* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
if (acer_tm360_irqrouting && dev->irq == 11 &&
dev->vendor == PCI_VENDOR_ID_O2) {
pirq = 0x68;
mask = 0x400;
dev->irq = r->get(pirq_router_dev, dev, pirq);
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
}
/*
* Find the best IRQ to assign: use the one
* reported by the device if possible.
*/
newirq = dev->irq;
if (newirq && !((1 << newirq) & mask)) {
if (pci_probe & PCI_USE_PIRQ_MASK)
newirq = 0;
else
dev_warn(&dev->dev, "IRQ %d doesn't match PIRQ mask "
"%#x; try pci=usepirqmask\n", newirq, mask);
}
if (!newirq && assign) {
for (i = 0; i < 16; i++) {
if (!(mask & (1 << i)))
continue;
if (pirq_penalty[i] < pirq_penalty[newirq] &&
can_request_irq(i, IRQF_SHARED))
newirq = i;
}
}
dev_dbg(&dev->dev, "PCI INT %c -> newirq %d", 'A' + dpin - 1, newirq);
/* Check if it is hardcoded */
if ((pirq & 0xf0) == 0xf0) {
irq = pirq & 0xf;
msg = "hardcoded";
} else if (r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask))) {
msg = "found";
if (r->lvl)
r->lvl(pirq_router_dev, dev, pirq, irq);
else
elcr_set_level_irq(irq);
} else if (newirq && r->set &&
(dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
if (r->set(pirq_router_dev, dev, pirq, newirq)) {
if (r->lvl)
r->lvl(pirq_router_dev, dev, pirq, newirq);
else
elcr_set_level_irq(newirq);
msg = "assigned";
irq = newirq;
}
}
if (!irq) {
if (newirq && mask == (1 << newirq)) {
msg = "guessed";
irq = newirq;
} else {
dev_dbg(&dev->dev, "can't route interrupt\n");
return 0;
}
}
dev_info(&dev->dev, "%s PCI INT %c -> IRQ %d\n",
msg, 'A' + dpin - 1, irq);
/* Update IRQ for all devices with the same pirq value */
for_each_pci_dev(dev2) {
pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &dpin);
if (!dpin)
continue;
pin = dpin;
info = pirq_get_info(dev2, &pin);
if (!info)
continue;
if (info->irq[pin - 1].link == pirq) {
/*
* We refuse to override the dev->irq
* information. Give a warning!
*/
if (dev2->irq && dev2->irq != irq && \
(!(pci_probe & PCI_USE_PIRQ_MASK) || \
((1 << dev2->irq) & mask))) {
#ifndef CONFIG_PCI_MSI
dev_info(&dev2->dev, "IRQ routing conflict: "
"have IRQ %d, want IRQ %d\n",
dev2->irq, irq);
#endif
continue;
}
dev2->irq = irq;
pirq_penalty[irq]++;
if (dev != dev2)
dev_info(&dev->dev, "sharing IRQ %d with %s\n",
irq, pci_name(dev2));
}
}
return 1;
}
void __init pcibios_fixup_irqs(void)
{
struct pci_dev *dev = NULL;
u8 pin;
DBG(KERN_DEBUG "PCI: IRQ fixup\n");
for_each_pci_dev(dev) {
/*
* If the BIOS has set an out of range IRQ number, just
* ignore it. Also keep track of which IRQ's are
* already in use.
*/
if (dev->irq >= 16) {
dev_dbg(&dev->dev, "ignoring bogus IRQ %d\n", dev->irq);
dev->irq = 0;
}
/*
* If the IRQ is already assigned to a PCI device,
* ignore its ISA use penalty
*/
if (pirq_penalty[dev->irq] >= 100 &&
pirq_penalty[dev->irq] < 100000)
pirq_penalty[dev->irq] = 0;
pirq_penalty[dev->irq]++;
}
if (io_apic_assign_pci_irqs)
return;
dev = NULL;
for_each_pci_dev(dev) {
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (!pin)
continue;
/*
* Still no IRQ? Try to lookup one...
*/
if (!dev->irq)
pcibios_lookup_irq(dev, 0);
}
}
/*
* Work around broken HP Pavilion Notebooks which assign USB to
* IRQ 9 even though it is actually wired to IRQ 11
*/
static int __init fix_broken_hp_bios_irq9(const struct dmi_system_id *d)
{
if (!broken_hp_bios_irq9) {
broken_hp_bios_irq9 = 1;
printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
d->ident);
}
return 0;
}
/*
* Work around broken Acer TravelMate 360 Notebooks which assign
* Cardbus to IRQ 11 even though it is actually wired to IRQ 10
*/
static int __init fix_acer_tm360_irqrouting(const struct dmi_system_id *d)
{
if (!acer_tm360_irqrouting) {
acer_tm360_irqrouting = 1;
printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
d->ident);
}
return 0;
}
static const struct dmi_system_id pciirq_dmi_table[] __initconst = {
{
.callback = fix_broken_hp_bios_irq9,
.ident = "HP Pavilion N5400 Series Laptop",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
DMI_MATCH(DMI_PRODUCT_VERSION,
"HP Pavilion Notebook Model GE"),
DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
},
},
{
.callback = fix_acer_tm360_irqrouting,
.ident = "Acer TravelMate 36x Laptop",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
},
},
{ }
};
void __init pcibios_irq_init(void)
{
struct irq_routing_table *rtable = NULL;
DBG(KERN_DEBUG "PCI: IRQ init\n");
if (raw_pci_ops == NULL)
return;
dmi_check_system(pciirq_dmi_table);
pirq_table = pirq_find_routing_table();
#ifdef CONFIG_PCI_BIOS
if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN)) {
pirq_table = pcibios_get_irq_routing_table();
rtable = pirq_table;
}
#endif
if (pirq_table) {
pirq_peer_trick();
pirq_find_router(&pirq_router);
if (pirq_table->exclusive_irqs) {
int i;
for (i = 0; i < 16; i++)
if (!(pirq_table->exclusive_irqs & (1 << i)))
pirq_penalty[i] += 100;
}
/*
* If we're using the I/O APIC, avoid using the PCI IRQ
* routing table
*/
if (io_apic_assign_pci_irqs) {
kfree(rtable);
pirq_table = NULL;
}
}
x86_init.pci.fixup_irqs();
if (io_apic_assign_pci_irqs && pci_routeirq) {
struct pci_dev *dev = NULL;
/*
* PCI IRQ routing is set up by pci_enable_device(), but we
* also do it here in case there are still broken drivers that
* don't use pci_enable_device().
*/
printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
for_each_pci_dev(dev)
pirq_enable_irq(dev);
}
}
static void pirq_penalize_isa_irq(int irq, int active)
{
/*
* If any ISAPnP device reports an IRQ in its list of possible
* IRQ's, we try to avoid assigning it to PCI devices.
*/
if (irq < 16) {
if (active)
pirq_penalty[irq] += 1000;
else
pirq_penalty[irq] += 100;
}
}
void pcibios_penalize_isa_irq(int irq, int active)
{
#ifdef CONFIG_ACPI
if (!acpi_noirq)
acpi_penalize_isa_irq(irq, active);
else
#endif
pirq_penalize_isa_irq(irq, active);
}
static int pirq_enable_irq(struct pci_dev *dev)
{
u8 pin = 0;
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (pin && !pcibios_lookup_irq(dev, 1)) {
char *msg = "";
if (!io_apic_assign_pci_irqs && dev->irq)
return 0;
if (io_apic_assign_pci_irqs) {
#ifdef CONFIG_X86_IO_APIC
struct pci_dev *temp_dev;
int irq;
if (dev->irq_managed && dev->irq > 0)
return 0;
irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
PCI_SLOT(dev->devfn), pin - 1);
/*
* Busses behind bridges are typically not listed in the MP-table.
* In this case we have to look up the IRQ based on the parent bus,
* parent slot, and pin number. The SMP code detects such bridged
* busses itself so we should get into this branch reliably.
*/
temp_dev = dev;
while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
struct pci_dev *bridge = dev->bus->self;
pin = pci_swizzle_interrupt_pin(dev, pin);
irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
PCI_SLOT(bridge->devfn),
pin - 1);
if (irq >= 0)
dev_warn(&dev->dev, "using bridge %s "
"INT %c to get IRQ %d\n",
pci_name(bridge), 'A' + pin - 1,
irq);
dev = bridge;
}
dev = temp_dev;
if (irq >= 0) {
dev->irq_managed = 1;
dev->irq = irq;
dev_info(&dev->dev, "PCI->APIC IRQ transform: "
"INT %c -> IRQ %d\n", 'A' + pin - 1, irq);
return 0;
} else
msg = "; probably buggy MP table";
#endif
} else if (pci_probe & PCI_BIOS_IRQ_SCAN)
msg = "";
else
msg = "; please try using pci=biosirq";
/*
* With IDE legacy devices the IRQ lookup failure is not
* a problem..
*/
if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
!(dev->class & 0x5))
return 0;
dev_warn(&dev->dev, "can't find IRQ for PCI INT %c%s\n",
'A' + pin - 1, msg);
}
return 0;
}
bool mp_should_keep_irq(struct device *dev)
{
if (dev->power.is_prepared)
return true;
#ifdef CONFIG_PM
if (dev->power.runtime_status == RPM_SUSPENDING)
return true;
#endif
return false;
}
static void pirq_disable_irq(struct pci_dev *dev)
{
if (io_apic_assign_pci_irqs && !mp_should_keep_irq(&dev->dev) &&
dev->irq_managed && dev->irq) {
mp_unmap_irq(dev->irq);
dev->irq = 0;
dev->irq_managed = 0;
}
}
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