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original_kernel/arch/powerpc/platforms/powermac/pic.c

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/*
* Support for the interrupt controllers found on Power Macintosh,
* currently Apple's "Grand Central" interrupt controller in all
* it's incarnations. OpenPIC support used on newer machines is
* in a separate file
*
* Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
*
* Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/sysdev.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/module.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/time.h>
#include <asm/pmac_feature.h>
#include <asm/mpic.h>
#include "pmac.h"
/*
* XXX this should be in xmon.h, but putting it there means xmon.h
* has to include <linux/interrupt.h> (to get irqreturn_t), which
* causes all sorts of problems. -- paulus
*/
extern irqreturn_t xmon_irq(int, void *, struct pt_regs *);
#ifdef CONFIG_PPC32
struct pmac_irq_hw {
unsigned int event;
unsigned int enable;
unsigned int ack;
unsigned int level;
};
/* Default addresses */
static volatile struct pmac_irq_hw *pmac_irq_hw[4] = {
(struct pmac_irq_hw *) 0xf3000020,
(struct pmac_irq_hw *) 0xf3000010,
(struct pmac_irq_hw *) 0xf4000020,
(struct pmac_irq_hw *) 0xf4000010,
};
#define GC_LEVEL_MASK 0x3ff00000
#define OHARE_LEVEL_MASK 0x1ff00000
#define HEATHROW_LEVEL_MASK 0x1ff00000
static int max_irqs;
static int max_real_irqs;
static u32 level_mask[4];
static DEFINE_SPINLOCK(pmac_pic_lock);
/* XXX here for now, should move to arch/powerpc/kernel/irq.c */
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#define GATWICK_IRQ_POOL_SIZE 10
static struct interrupt_info gatwick_int_pool[GATWICK_IRQ_POOL_SIZE];
/*
* Mark an irq as "lost". This is only used on the pmac
* since it can lose interrupts (see pmac_set_irq_mask).
* -- Cort
*/
void
__set_lost(unsigned long irq_nr, int nokick)
{
if (!test_and_set_bit(irq_nr, ppc_lost_interrupts)) {
atomic_inc(&ppc_n_lost_interrupts);
if (!nokick)
set_dec(1);
}
}
static void
pmac_mask_and_ack_irq(unsigned int irq_nr)
{
unsigned long bit = 1UL << (irq_nr & 0x1f);
int i = irq_nr >> 5;
unsigned long flags;
if ((unsigned)irq_nr >= max_irqs)
return;
clear_bit(irq_nr, ppc_cached_irq_mask);
if (test_and_clear_bit(irq_nr, ppc_lost_interrupts))
atomic_dec(&ppc_n_lost_interrupts);
spin_lock_irqsave(&pmac_pic_lock, flags);
out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
out_le32(&pmac_irq_hw[i]->ack, bit);
do {
/* make sure ack gets to controller before we enable
interrupts */
mb();
} while((in_le32(&pmac_irq_hw[i]->enable) & bit)
!= (ppc_cached_irq_mask[i] & bit));
spin_unlock_irqrestore(&pmac_pic_lock, flags);
}
static void pmac_set_irq_mask(unsigned int irq_nr, int nokicklost)
{
unsigned long bit = 1UL << (irq_nr & 0x1f);
int i = irq_nr >> 5;
unsigned long flags;
if ((unsigned)irq_nr >= max_irqs)
return;
spin_lock_irqsave(&pmac_pic_lock, flags);
/* enable unmasked interrupts */
out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
do {
/* make sure mask gets to controller before we
return to user */
mb();
} while((in_le32(&pmac_irq_hw[i]->enable) & bit)
!= (ppc_cached_irq_mask[i] & bit));
/*
* Unfortunately, setting the bit in the enable register
* when the device interrupt is already on *doesn't* set
* the bit in the flag register or request another interrupt.
*/
if (bit & ppc_cached_irq_mask[i] & in_le32(&pmac_irq_hw[i]->level))
__set_lost((ulong)irq_nr, nokicklost);
spin_unlock_irqrestore(&pmac_pic_lock, flags);
}
/* When an irq gets requested for the first client, if it's an
* edge interrupt, we clear any previous one on the controller
*/
static unsigned int pmac_startup_irq(unsigned int irq_nr)
{
unsigned long bit = 1UL << (irq_nr & 0x1f);
int i = irq_nr >> 5;
if ((irq_desc[irq_nr].status & IRQ_LEVEL) == 0)
out_le32(&pmac_irq_hw[i]->ack, bit);
set_bit(irq_nr, ppc_cached_irq_mask);
pmac_set_irq_mask(irq_nr, 0);
return 0;
}
static void pmac_mask_irq(unsigned int irq_nr)
{
clear_bit(irq_nr, ppc_cached_irq_mask);
pmac_set_irq_mask(irq_nr, 0);
mb();
}
static void pmac_unmask_irq(unsigned int irq_nr)
{
set_bit(irq_nr, ppc_cached_irq_mask);
pmac_set_irq_mask(irq_nr, 0);
}
static void pmac_end_irq(unsigned int irq_nr)
{
if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
&& irq_desc[irq_nr].action) {
set_bit(irq_nr, ppc_cached_irq_mask);
pmac_set_irq_mask(irq_nr, 1);
}
}
struct hw_interrupt_type pmac_pic = {
.typename = " PMAC-PIC ",
.startup = pmac_startup_irq,
.enable = pmac_unmask_irq,
.disable = pmac_mask_irq,
.ack = pmac_mask_and_ack_irq,
.end = pmac_end_irq,
};
struct hw_interrupt_type gatwick_pic = {
.typename = " GATWICK ",
.startup = pmac_startup_irq,
.enable = pmac_unmask_irq,
.disable = pmac_mask_irq,
.ack = pmac_mask_and_ack_irq,
.end = pmac_end_irq,
};
static irqreturn_t gatwick_action(int cpl, void *dev_id, struct pt_regs *regs)
{
int irq, bits;
for (irq = max_irqs; (irq -= 32) >= max_real_irqs; ) {
int i = irq >> 5;
bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
/* We must read level interrupts from the level register */
bits |= (in_le32(&pmac_irq_hw[i]->level) & level_mask[i]);
bits &= ppc_cached_irq_mask[i];
if (bits == 0)
continue;
irq += __ilog2(bits);
__do_IRQ(irq, regs);
return IRQ_HANDLED;
}
printk("gatwick irq not from gatwick pic\n");
return IRQ_NONE;
}
int
pmac_get_irq(struct pt_regs *regs)
{
int irq;
unsigned long bits = 0;
#ifdef CONFIG_SMP
void psurge_smp_message_recv(struct pt_regs *);
/* IPI's are a hack on the powersurge -- Cort */
if ( smp_processor_id() != 0 ) {
psurge_smp_message_recv(regs);
return -2; /* ignore, already handled */
}
#endif /* CONFIG_SMP */
for (irq = max_real_irqs; (irq -= 32) >= 0; ) {
int i = irq >> 5;
bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
/* We must read level interrupts from the level register */
bits |= (in_le32(&pmac_irq_hw[i]->level) & level_mask[i]);
bits &= ppc_cached_irq_mask[i];
if (bits == 0)
continue;
irq += __ilog2(bits);
break;
}
return irq;
}
/* This routine will fix some missing interrupt values in the device tree
* on the gatwick mac-io controller used by some PowerBooks
*/
static void __init
pmac_fix_gatwick_interrupts(struct device_node *gw, int irq_base)
{
struct device_node *node;
int count;
memset(gatwick_int_pool, 0, sizeof(gatwick_int_pool));
node = gw->child;
count = 0;
while(node)
{
/* Fix SCC */
if (strcasecmp(node->name, "escc") == 0)
if (node->child) {
if (node->child->n_intrs < 3) {
node->child->intrs = &gatwick_int_pool[count];
count += 3;
}
node->child->n_intrs = 3;
node->child->intrs[0].line = 15+irq_base;
node->child->intrs[1].line = 4+irq_base;
node->child->intrs[2].line = 5+irq_base;
printk(KERN_INFO "irq: fixed SCC on second controller (%d,%d,%d)\n",
node->child->intrs[0].line,
node->child->intrs[1].line,
node->child->intrs[2].line);
}
/* Fix media-bay & left SWIM */
if (strcasecmp(node->name, "media-bay") == 0) {
struct device_node* ya_node;
if (node->n_intrs == 0)
node->intrs = &gatwick_int_pool[count++];
node->n_intrs = 1;
node->intrs[0].line = 29+irq_base;
printk(KERN_INFO "irq: fixed media-bay on second controller (%d)\n",
node->intrs[0].line);
ya_node = node->child;
while(ya_node)
{
if (strcasecmp(ya_node->name, "floppy") == 0) {
if (ya_node->n_intrs < 2) {
ya_node->intrs = &gatwick_int_pool[count];
count += 2;
}
ya_node->n_intrs = 2;
ya_node->intrs[0].line = 19+irq_base;
ya_node->intrs[1].line = 1+irq_base;
printk(KERN_INFO "irq: fixed floppy on second controller (%d,%d)\n",
ya_node->intrs[0].line, ya_node->intrs[1].line);
}
if (strcasecmp(ya_node->name, "ata4") == 0) {
if (ya_node->n_intrs < 2) {
ya_node->intrs = &gatwick_int_pool[count];
count += 2;
}
ya_node->n_intrs = 2;
ya_node->intrs[0].line = 14+irq_base;
ya_node->intrs[1].line = 3+irq_base;
printk(KERN_INFO "irq: fixed ide on second controller (%d,%d)\n",
ya_node->intrs[0].line, ya_node->intrs[1].line);
}
ya_node = ya_node->sibling;
}
}
node = node->sibling;
}
if (count > 10) {
printk("WARNING !! Gatwick interrupt pool overflow\n");
printk(" GATWICK_IRQ_POOL_SIZE = %d\n", GATWICK_IRQ_POOL_SIZE);
printk(" requested = %d\n", count);
}
}
/*
* The PowerBook 3400/2400/3500 can have a combo ethernet/modem
* card which includes an ohare chip that acts as a second interrupt
* controller. If we find this second ohare, set it up and fix the
* interrupt value in the device tree for the ethernet chip.
*/
static int __init enable_second_ohare(void)
{
unsigned char bus, devfn;
unsigned short cmd;
unsigned long addr;
struct device_node *irqctrler = find_devices("pci106b,7");
struct device_node *ether;
if (irqctrler == NULL || irqctrler->n_addrs <= 0)
return -1;
addr = (unsigned long) ioremap(irqctrler->addrs[0].address, 0x40);
pmac_irq_hw[1] = (volatile struct pmac_irq_hw *)(addr + 0x20);
max_irqs = 64;
if (pci_device_from_OF_node(irqctrler, &bus, &devfn) == 0) {
struct pci_controller* hose = pci_find_hose_for_OF_device(irqctrler);
if (!hose)
printk(KERN_ERR "Can't find PCI hose for OHare2 !\n");
else {
early_read_config_word(hose, bus, devfn, PCI_COMMAND, &cmd);
cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
cmd &= ~PCI_COMMAND_IO;
early_write_config_word(hose, bus, devfn, PCI_COMMAND, cmd);
}
}
/* Fix interrupt for the modem/ethernet combo controller. The number
in the device tree (27) is bogus (correct for the ethernet-only
board but not the combo ethernet/modem board).
The real interrupt is 28 on the second controller -> 28+32 = 60.
*/
ether = find_devices("pci1011,14");
if (ether && ether->n_intrs > 0) {
ether->intrs[0].line = 60;
printk(KERN_INFO "irq: Fixed ethernet IRQ to %d\n",
ether->intrs[0].line);
}
/* Return the interrupt number of the cascade */
return irqctrler->intrs[0].line;
}
#ifdef CONFIG_XMON
static struct irqaction xmon_action = {
.handler = xmon_irq,
.flags = 0,
.mask = CPU_MASK_NONE,
.name = "NMI - XMON"
};
#endif
static struct irqaction gatwick_cascade_action = {
.handler = gatwick_action,
.flags = SA_INTERRUPT,
.mask = CPU_MASK_NONE,
.name = "cascade",
};
#endif /* CONFIG_PPC32 */
static int pmac_u3_cascade(struct pt_regs *regs, void *data)
{
return mpic_get_one_irq((struct mpic *)data, regs);
}
void __init pmac_pic_init(void)
{
struct device_node *irqctrler = NULL;
struct device_node *irqctrler2 = NULL;
struct device_node *np;
#ifdef CONFIG_PPC32
int i;
unsigned long addr;
int irq_cascade = -1;
#endif
struct mpic *mpic1, *mpic2;
/* We first try to detect Apple's new Core99 chipset, since mac-io
* is quite different on those machines and contains an IBM MPIC2.
*/
np = find_type_devices("open-pic");
while (np) {
if (np->parent && !strcmp(np->parent->name, "u3"))
irqctrler2 = np;
else
irqctrler = np;
np = np->next;
}
if (irqctrler != NULL && irqctrler->n_addrs > 0) {
unsigned char senses[128];
printk(KERN_INFO "PowerMac using OpenPIC irq controller at 0x%08x\n",
(unsigned int)irqctrler->addrs[0].address);
ppc_md.get_irq = mpic_get_irq;
pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler, 0, 0);
prom_get_irq_senses(senses, 0, 128);
mpic1 = mpic_alloc(irqctrler->addrs[0].address,
MPIC_PRIMARY | MPIC_WANTS_RESET,
0, 0, 128, 252, senses, 128, " OpenPIC ");
BUG_ON(mpic1 == NULL);
mpic_init(mpic1);
if (irqctrler2 != NULL && irqctrler2->n_intrs > 0 &&
irqctrler2->n_addrs > 0) {
printk(KERN_INFO "Slave OpenPIC at 0x%08x hooked on IRQ %d\n",
(u32)irqctrler2->addrs[0].address,
irqctrler2->intrs[0].line);
pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler2, 0, 0);
prom_get_irq_senses(senses, 128, 128 + 124);
/* We don't need to set MPIC_BROKEN_U3 here since we don't have
* hypertransport interrupts routed to it
*/
mpic2 = mpic_alloc(irqctrler2->addrs[0].address,
MPIC_BIG_ENDIAN | MPIC_WANTS_RESET,
0, 128, 124, 0, senses, 124,
" U3-MPIC ");
BUG_ON(mpic2 == NULL);
mpic_init(mpic2);
mpic_setup_cascade(irqctrler2->intrs[0].line,
pmac_u3_cascade, mpic2);
}
#if defined(CONFIG_XMON) && defined(CONFIG_PPC32)
{
struct device_node* pswitch;
int nmi_irq;
pswitch = find_devices("programmer-switch");
if (pswitch && pswitch->n_intrs) {
nmi_irq = pswitch->intrs[0].line;
mpic_irq_set_priority(nmi_irq, 9);
setup_irq(nmi_irq, &xmon_action);
}
}
#endif /* CONFIG_XMON */
return;
}
irqctrler = NULL;
#ifdef CONFIG_PPC32
/* Get the level/edge settings, assume if it's not
* a Grand Central nor an OHare, then it's an Heathrow
* (or Paddington).
*/
if (find_devices("gc"))
level_mask[0] = GC_LEVEL_MASK;
else if (find_devices("ohare")) {
level_mask[0] = OHARE_LEVEL_MASK;
/* We might have a second cascaded ohare */
level_mask[1] = OHARE_LEVEL_MASK;
} else {
level_mask[0] = HEATHROW_LEVEL_MASK;
level_mask[1] = 0;
/* We might have a second cascaded heathrow */
level_mask[2] = HEATHROW_LEVEL_MASK;
level_mask[3] = 0;
}
/*
* G3 powermacs and 1999 G3 PowerBooks have 64 interrupts,
* 1998 G3 Series PowerBooks have 128,
* other powermacs have 32.
* The combo ethernet/modem card for the Powerstar powerbooks
* (2400/3400/3500, ohare based) has a second ohare chip
* effectively making a total of 64.
*/
max_irqs = max_real_irqs = 32;
irqctrler = find_devices("mac-io");
if (irqctrler)
{
max_real_irqs = 64;
if (irqctrler->next)
max_irqs = 128;
else
max_irqs = 64;
}
for ( i = 0; i < max_real_irqs ; i++ )
irq_desc[i].handler = &pmac_pic;
/* get addresses of first controller */
if (irqctrler) {
if (irqctrler->n_addrs > 0) {
addr = (unsigned long)
ioremap(irqctrler->addrs[0].address, 0x40);
for (i = 0; i < 2; ++i)
pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
(addr + (2 - i) * 0x10);
}
/* get addresses of second controller */
irqctrler = irqctrler->next;
if (irqctrler && irqctrler->n_addrs > 0) {
addr = (unsigned long)
ioremap(irqctrler->addrs[0].address, 0x40);
for (i = 2; i < 4; ++i)
pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
(addr + (4 - i) * 0x10);
irq_cascade = irqctrler->intrs[0].line;
if (device_is_compatible(irqctrler, "gatwick"))
pmac_fix_gatwick_interrupts(irqctrler, max_real_irqs);
}
} else {
/* older powermacs have a GC (grand central) or ohare at
f3000000, with interrupt control registers at f3000020. */
addr = (unsigned long) ioremap(0xf3000000, 0x40);
pmac_irq_hw[0] = (volatile struct pmac_irq_hw *) (addr + 0x20);
}
/* PowerBooks 3400 and 3500 can have a second controller in a second
ohare chip, on the combo ethernet/modem card */
if (machine_is_compatible("AAPL,3400/2400")
|| machine_is_compatible("AAPL,3500"))
irq_cascade = enable_second_ohare();
/* disable all interrupts in all controllers */
for (i = 0; i * 32 < max_irqs; ++i)
out_le32(&pmac_irq_hw[i]->enable, 0);
/* mark level interrupts */
for (i = 0; i < max_irqs; i++)
if (level_mask[i >> 5] & (1UL << (i & 0x1f)))
irq_desc[i].status = IRQ_LEVEL;
/* get interrupt line of secondary interrupt controller */
if (irq_cascade >= 0) {
printk(KERN_INFO "irq: secondary controller on irq %d\n",
(int)irq_cascade);
for ( i = max_real_irqs ; i < max_irqs ; i++ )
irq_desc[i].handler = &gatwick_pic;
setup_irq(irq_cascade, &gatwick_cascade_action);
}
printk("System has %d possible interrupts\n", max_irqs);
if (max_irqs != max_real_irqs)
printk(KERN_DEBUG "%d interrupts on main controller\n",
max_real_irqs);
#ifdef CONFIG_XMON
setup_irq(20, &xmon_action);
#endif /* CONFIG_XMON */
#endif /* CONFIG_PPC32 */
}
#ifdef CONFIG_PM
/*
* These procedures are used in implementing sleep on the powerbooks.
* sleep_save_intrs() saves the states of all interrupt enables
* and disables all interrupts except for the nominated one.
* sleep_restore_intrs() restores the states of all interrupt enables.
*/
unsigned long sleep_save_mask[2];
/* This used to be passed by the PMU driver but that link got
* broken with the new driver model. We use this tweak for now...
*/
static int pmacpic_find_viaint(void)
{
int viaint = -1;
#ifdef CONFIG_ADB_PMU
struct device_node *np;
if (pmu_get_model() != PMU_OHARE_BASED)
goto not_found;
np = of_find_node_by_name(NULL, "via-pmu");
if (np == NULL)
goto not_found;
viaint = np->intrs[0].line;
#endif /* CONFIG_ADB_PMU */
not_found:
return viaint;
}
static int pmacpic_suspend(struct sys_device *sysdev, pm_message_t state)
{
int viaint = pmacpic_find_viaint();
sleep_save_mask[0] = ppc_cached_irq_mask[0];
sleep_save_mask[1] = ppc_cached_irq_mask[1];
ppc_cached_irq_mask[0] = 0;
ppc_cached_irq_mask[1] = 0;
if (viaint > 0)
set_bit(viaint, ppc_cached_irq_mask);
out_le32(&pmac_irq_hw[0]->enable, ppc_cached_irq_mask[0]);
if (max_real_irqs > 32)
out_le32(&pmac_irq_hw[1]->enable, ppc_cached_irq_mask[1]);
(void)in_le32(&pmac_irq_hw[0]->event);
/* make sure mask gets to controller before we return to caller */
mb();
(void)in_le32(&pmac_irq_hw[0]->enable);
return 0;
}
static int pmacpic_resume(struct sys_device *sysdev)
{
int i;
out_le32(&pmac_irq_hw[0]->enable, 0);
if (max_real_irqs > 32)
out_le32(&pmac_irq_hw[1]->enable, 0);
mb();
for (i = 0; i < max_real_irqs; ++i)
if (test_bit(i, sleep_save_mask))
pmac_unmask_irq(i);
return 0;
}
#endif /* CONFIG_PM */
static struct sysdev_class pmacpic_sysclass = {
set_kset_name("pmac_pic"),
};
static struct sys_device device_pmacpic = {
.id = 0,
.cls = &pmacpic_sysclass,
};
static struct sysdev_driver driver_pmacpic = {
#ifdef CONFIG_PM
.suspend = &pmacpic_suspend,
.resume = &pmacpic_resume,
#endif /* CONFIG_PM */
};
static int __init init_pmacpic_sysfs(void)
{
#ifdef CONFIG_PPC32
if (max_irqs == 0)
return -ENODEV;
#endif
printk(KERN_DEBUG "Registering pmac pic with sysfs...\n");
sysdev_class_register(&pmacpic_sysclass);
sysdev_register(&device_pmacpic);
sysdev_driver_register(&pmacpic_sysclass, &driver_pmacpic);
return 0;
}
subsys_initcall(init_pmacpic_sysfs);
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