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linux/linux-5.4.31/arch/powerpc/platforms/powermac/pic.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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)
* Copyright (C) 2005 Benjamin Herrenschmidt (benh@kernel.crashing.org)
* IBM, Corp.
*/
#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/syscore_ops.h>
#include <linux/adb.h>
#include <linux/pmu.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 <asm/xmon.h>
#include "pmac.h"
#ifdef CONFIG_PPC32
struct pmac_irq_hw {
unsigned int event;
unsigned int enable;
unsigned int ack;
unsigned int level;
};
/* Workaround flags for 32bit powermac machines */
unsigned int of_irq_workarounds;
struct device_node *of_irq_dflt_pic;
/* Default addresses */
static volatile struct pmac_irq_hw __iomem *pmac_irq_hw[4];
static int max_irqs;
static int max_real_irqs;
static DEFINE_RAW_SPINLOCK(pmac_pic_lock);
/* The max irq number this driver deals with is 128; see max_irqs */
static DECLARE_BITMAP(ppc_lost_interrupts, 128);
static DECLARE_BITMAP(ppc_cached_irq_mask, 128);
static int pmac_irq_cascade = -1;
static struct irq_domain *pmac_pic_host;
static void __pmac_retrigger(unsigned int irq_nr)
{
if (irq_nr >= max_real_irqs && pmac_irq_cascade > 0) {
__set_bit(irq_nr, ppc_lost_interrupts);
irq_nr = pmac_irq_cascade;
mb();
}
if (!__test_and_set_bit(irq_nr, ppc_lost_interrupts)) {
atomic_inc(&ppc_n_lost_interrupts);
set_dec(1);
}
}
static void pmac_mask_and_ack_irq(struct irq_data *d)
{
unsigned int src = irqd_to_hwirq(d);
unsigned long bit = 1UL << (src & 0x1f);
int i = src >> 5;
unsigned long flags;
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
__clear_bit(src, ppc_cached_irq_mask);
if (__test_and_clear_bit(src, ppc_lost_interrupts))
atomic_dec(&ppc_n_lost_interrupts);
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));
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
}
static void pmac_ack_irq(struct irq_data *d)
{
unsigned int src = irqd_to_hwirq(d);
unsigned long bit = 1UL << (src & 0x1f);
int i = src >> 5;
unsigned long flags;
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
if (__test_and_clear_bit(src, ppc_lost_interrupts))
atomic_dec(&ppc_n_lost_interrupts);
out_le32(&pmac_irq_hw[i]->ack, bit);
(void)in_le32(&pmac_irq_hw[i]->ack);
raw_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;
if ((unsigned)irq_nr >= max_irqs)
return;
/* 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))
__pmac_retrigger(irq_nr);
}
/* 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(struct irq_data *d)
{
unsigned long flags;
unsigned int src = irqd_to_hwirq(d);
unsigned long bit = 1UL << (src & 0x1f);
int i = src >> 5;
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
if (!irqd_is_level_type(d))
out_le32(&pmac_irq_hw[i]->ack, bit);
__set_bit(src, ppc_cached_irq_mask);
__pmac_set_irq_mask(src, 0);
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
return 0;
}
static void pmac_mask_irq(struct irq_data *d)
{
unsigned long flags;
unsigned int src = irqd_to_hwirq(d);
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
__clear_bit(src, ppc_cached_irq_mask);
__pmac_set_irq_mask(src, 1);
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
}
static void pmac_unmask_irq(struct irq_data *d)
{
unsigned long flags;
unsigned int src = irqd_to_hwirq(d);
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
__set_bit(src, ppc_cached_irq_mask);
__pmac_set_irq_mask(src, 0);
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
}
static int pmac_retrigger(struct irq_data *d)
{
unsigned long flags;
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
__pmac_retrigger(irqd_to_hwirq(d));
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
return 1;
}
static struct irq_chip pmac_pic = {
.name = "PMAC-PIC",
.irq_startup = pmac_startup_irq,
.irq_mask = pmac_mask_irq,
.irq_ack = pmac_ack_irq,
.irq_mask_ack = pmac_mask_and_ack_irq,
.irq_unmask = pmac_unmask_irq,
.irq_retrigger = pmac_retrigger,
};
static irqreturn_t gatwick_action(int cpl, void *dev_id)
{
unsigned long flags;
int irq, bits;
int rc = IRQ_NONE;
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
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];
bits |= in_le32(&pmac_irq_hw[i]->level);
bits &= ppc_cached_irq_mask[i];
if (bits == 0)
continue;
irq += __ilog2(bits);
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
generic_handle_irq(irq);
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
rc = IRQ_HANDLED;
}
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
return rc;
}
static unsigned int pmac_pic_get_irq(void)
{
int irq;
unsigned long bits = 0;
unsigned long flags;
#ifdef CONFIG_PPC_PMAC32_PSURGE
/* IPI's are a hack on the powersurge -- Cort */
if (smp_processor_id() != 0) {
return psurge_secondary_virq;
}
#endif /* CONFIG_PPC_PMAC32_PSURGE */
raw_spin_lock_irqsave(&pmac_pic_lock, flags);
for (irq = max_real_irqs; (irq -= 32) >= 0; ) {
int i = irq >> 5;
bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
bits |= in_le32(&pmac_irq_hw[i]->level);
bits &= ppc_cached_irq_mask[i];
if (bits == 0)
continue;
irq += __ilog2(bits);
break;
}
raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
if (unlikely(irq < 0))
return 0;
return irq_linear_revmap(pmac_pic_host, irq);
}
#ifdef CONFIG_XMON
static struct irqaction xmon_action = {
.handler = xmon_irq,
.flags = IRQF_NO_THREAD,
.name = "NMI - XMON"
};
#endif
static struct irqaction gatwick_cascade_action = {
.handler = gatwick_action,
.flags = IRQF_NO_THREAD,
.name = "cascade",
};
static int pmac_pic_host_match(struct irq_domain *h, struct device_node *node,
enum irq_domain_bus_token bus_token)
{
/* We match all, we don't always have a node anyway */
return 1;
}
static int pmac_pic_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
if (hw >= max_irqs)
return -EINVAL;
/* Mark level interrupts, set delayed disable for edge ones and set
* handlers
*/
irq_set_status_flags(virq, IRQ_LEVEL);
irq_set_chip_and_handler(virq, &pmac_pic, handle_level_irq);
return 0;
}
static const struct irq_domain_ops pmac_pic_host_ops = {
.match = pmac_pic_host_match,
.map = pmac_pic_host_map,
.xlate = irq_domain_xlate_onecell,
};
static void __init pmac_pic_probe_oldstyle(void)
{
int i;
struct device_node *master = NULL;
struct device_node *slave = NULL;
u8 __iomem *addr;
struct resource r;
/* Set our get_irq function */
ppc_md.get_irq = pmac_pic_get_irq;
/*
* Find the interrupt controller type & node
*/
if ((master = of_find_node_by_name(NULL, "gc")) != NULL) {
max_irqs = max_real_irqs = 32;
} else if ((master = of_find_node_by_name(NULL, "ohare")) != NULL) {
max_irqs = max_real_irqs = 32;
/* We might have a second cascaded ohare */
slave = of_find_node_by_name(NULL, "pci106b,7");
if (slave)
max_irqs = 64;
} else if ((master = of_find_node_by_name(NULL, "mac-io")) != NULL) {
max_irqs = max_real_irqs = 64;
/* We might have a second cascaded heathrow */
/* Compensate for of_node_put() in of_find_node_by_name() */
of_node_get(master);
slave = of_find_node_by_name(master, "mac-io");
/* Check ordering of master & slave */
if (of_device_is_compatible(master, "gatwick")) {
struct device_node *tmp;
BUG_ON(slave == NULL);
tmp = master;
master = slave;
slave = tmp;
}
/* We found a slave */
if (slave)
max_irqs = 128;
}
BUG_ON(master == NULL);
/*
* Allocate an irq host
*/
pmac_pic_host = irq_domain_add_linear(master, max_irqs,
&pmac_pic_host_ops, NULL);
BUG_ON(pmac_pic_host == NULL);
irq_set_default_host(pmac_pic_host);
/* Get addresses of first controller if we have a node for it */
BUG_ON(of_address_to_resource(master, 0, &r));
/* Map interrupts of primary controller */
addr = (u8 __iomem *) ioremap(r.start, 0x40);
i = 0;
pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *)
(addr + 0x20);
if (max_real_irqs > 32)
pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *)
(addr + 0x10);
of_node_put(master);
printk(KERN_INFO "irq: Found primary Apple PIC %pOF for %d irqs\n",
master, max_real_irqs);
/* Map interrupts of cascaded controller */
if (slave && !of_address_to_resource(slave, 0, &r)) {
addr = (u8 __iomem *)ioremap(r.start, 0x40);
pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *)
(addr + 0x20);
if (max_irqs > 64)
pmac_irq_hw[i++] =
(volatile struct pmac_irq_hw __iomem *)
(addr + 0x10);
pmac_irq_cascade = irq_of_parse_and_map(slave, 0);
printk(KERN_INFO "irq: Found slave Apple PIC %pOF for %d irqs"
" cascade: %d\n", slave,
max_irqs - max_real_irqs, pmac_irq_cascade);
}
of_node_put(slave);
/* Disable all interrupts in all controllers */
for (i = 0; i * 32 < max_irqs; ++i)
out_le32(&pmac_irq_hw[i]->enable, 0);
/* Hookup cascade irq */
if (slave && pmac_irq_cascade)
setup_irq(pmac_irq_cascade, &gatwick_cascade_action);
printk(KERN_INFO "irq: System has %d possible interrupts\n", max_irqs);
#ifdef CONFIG_XMON
setup_irq(irq_create_mapping(NULL, 20), &xmon_action);
#endif
}
int of_irq_parse_oldworld(struct device_node *device, int index,
struct of_phandle_args *out_irq)
{
const u32 *ints = NULL;
int intlen;
/*
* Old machines just have a list of interrupt numbers
* and no interrupt-controller nodes. We also have dodgy
* cases where the APPL,interrupts property is completely
* missing behind pci-pci bridges and we have to get it
* from the parent (the bridge itself, as apple just wired
* everything together on these)
*/
while (device) {
ints = of_get_property(device, "AAPL,interrupts", &intlen);
if (ints != NULL)
break;
device = device->parent;
if (!of_node_is_type(device, "pci"))
break;
}
if (ints == NULL)
return -EINVAL;
intlen /= sizeof(u32);
if (index >= intlen)
return -EINVAL;
out_irq->np = NULL;
out_irq->args[0] = ints[index];
out_irq->args_count = 1;
return 0;
}
#endif /* CONFIG_PPC32 */
static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic)
{
#if defined(CONFIG_XMON) && defined(CONFIG_PPC32)
struct device_node* pswitch;
int nmi_irq;
pswitch = of_find_node_by_name(NULL, "programmer-switch");
if (pswitch) {
nmi_irq = irq_of_parse_and_map(pswitch, 0);
if (nmi_irq) {
mpic_irq_set_priority(nmi_irq, 9);
setup_irq(nmi_irq, &xmon_action);
}
of_node_put(pswitch);
}
#endif /* defined(CONFIG_XMON) && defined(CONFIG_PPC32) */
}
static struct mpic * __init pmac_setup_one_mpic(struct device_node *np,
int master)
{
const char *name = master ? " MPIC 1 " : " MPIC 2 ";
struct mpic *mpic;
unsigned int flags = master ? 0 : MPIC_SECONDARY;
pmac_call_feature(PMAC_FTR_ENABLE_MPIC, np, 0, 0);
if (of_get_property(np, "big-endian", NULL))
flags |= MPIC_BIG_ENDIAN;
/* Primary Big Endian means HT interrupts. This is quite dodgy
* but works until I find a better way
*/
if (master && (flags & MPIC_BIG_ENDIAN))
flags |= MPIC_U3_HT_IRQS;
mpic = mpic_alloc(np, 0, flags, 0, 0, name);
if (mpic == NULL)
return NULL;
mpic_init(mpic);
return mpic;
}
static int __init pmac_pic_probe_mpic(void)
{
struct mpic *mpic1, *mpic2;
struct device_node *np, *master = NULL, *slave = NULL;
/* We can have up to 2 MPICs cascaded */
for_each_node_by_type(np, "open-pic") {
if (master == NULL &&
of_get_property(np, "interrupts", NULL) == NULL)
master = of_node_get(np);
else if (slave == NULL)
slave = of_node_get(np);
if (master && slave) {
of_node_put(np);
break;
}
}
/* Check for bogus setups */
if (master == NULL && slave != NULL) {
master = slave;
slave = NULL;
}
/* Not found, default to good old pmac pic */
if (master == NULL)
return -ENODEV;
/* Set master handler */
ppc_md.get_irq = mpic_get_irq;
/* Setup master */
mpic1 = pmac_setup_one_mpic(master, 1);
BUG_ON(mpic1 == NULL);
/* Install NMI if any */
pmac_pic_setup_mpic_nmi(mpic1);
of_node_put(master);
/* Set up a cascaded controller, if present */
if (slave) {
mpic2 = pmac_setup_one_mpic(slave, 0);
if (mpic2 == NULL)
printk(KERN_ERR "Failed to setup slave MPIC\n");
of_node_put(slave);
}
return 0;
}
void __init pmac_pic_init(void)
{
/* We configure the OF parsing based on our oldworld vs. newworld
* platform type and whether we were booted by BootX.
*/
#ifdef CONFIG_PPC32
if (!pmac_newworld)
of_irq_workarounds |= OF_IMAP_OLDWORLD_MAC;
if (of_get_property(of_chosen, "linux,bootx", NULL) != NULL)
of_irq_workarounds |= OF_IMAP_NO_PHANDLE;
/* If we don't have phandles on a newworld, then try to locate a
* default interrupt controller (happens when booting with BootX).
* We do a first match here, hopefully, that only ever happens on
* machines with one controller.
*/
if (pmac_newworld && (of_irq_workarounds & OF_IMAP_NO_PHANDLE)) {
struct device_node *np;
for_each_node_with_property(np, "interrupt-controller") {
/* Skip /chosen/interrupt-controller */
if (of_node_name_eq(np, "chosen"))
continue;
/* It seems like at least one person wants
* to use BootX on a machine with an AppleKiwi
* controller which happens to pretend to be an
* interrupt controller too. */
if (of_node_name_eq(np, "AppleKiwi"))
continue;
/* I think we found one ! */
of_irq_dflt_pic = np;
break;
}
}
#endif /* CONFIG_PPC32 */
/* We first try to detect Apple's new Core99 chipset, since mac-io
* is quite different on those machines and contains an IBM MPIC2.
*/
if (pmac_pic_probe_mpic() == 0)
return;
#ifdef CONFIG_PPC32
pmac_pic_probe_oldstyle();
#endif
}
#if defined(CONFIG_PM) && defined(CONFIG_PPC32)
/*
* 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...
* We really want to do things differently though...
*/
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 = irq_of_parse_and_map(np, 0);
of_node_put(np);
not_found:
#endif /* CONFIG_ADB_PMU */
return viaint;
}
static int pmacpic_suspend(void)
{
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 void pmacpic_resume(void)
{
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(irq_get_irq_data(i));
}
static struct syscore_ops pmacpic_syscore_ops = {
.suspend = pmacpic_suspend,
.resume = pmacpic_resume,
};
static int __init init_pmacpic_syscore(void)
{
if (pmac_irq_hw[0])
register_syscore_ops(&pmacpic_syscore_ops);
return 0;
}
machine_subsys_initcall(powermac, init_pmacpic_syscore);
#endif /* CONFIG_PM && CONFIG_PPC32 */
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