Commit 69a07a41 authored by Thomas Bogendoerfer's avatar Thomas Bogendoerfer Committed by Paul Burton

MIPS: SGI-IP27: rework HUB interrupts

This commit rearranges the HUB interrupt code by using MIPS_IRQ_CPU
interrupt handling code and modern Linux IRQ framework features to get
rid of global arrays. It also adds support for irq affinity setting.
Signed-off-by: default avatarThomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
parent 2c865620
......@@ -675,6 +675,7 @@ config SGI_IP27
select DEFAULT_SGI_PARTITION
select SYS_HAS_EARLY_PRINTK
select HAVE_PCI
select IRQ_MIPS_CPU
select NR_CPUS_DEFAULT_64
select SYS_HAS_CPU_R10000
select SYS_SUPPORTS_64BIT_KERNEL
......
......@@ -10,13 +10,15 @@
#ifndef __ASM_MACH_IP27_IRQ_H
#define __ASM_MACH_IP27_IRQ_H
/*
* A hardwired interrupt number is completely stupid for this system - a
* large configuration might have thousands if not tenthousands of
* interrupts.
*/
#define NR_IRQS 256
#include_next <irq.h>
#define IP27_HUB_PEND0_IRQ (MIPS_CPU_IRQ_BASE + 2)
#define IP27_HUB_PEND1_IRQ (MIPS_CPU_IRQ_BASE + 3)
#define IP27_RT_TIMER_IRQ (MIPS_CPU_IRQ_BASE + 4)
#define IP27_HUB_IRQ_BASE (MIPS_CPU_IRQ_BASE + 8)
#define IP27_HUB_IRQ_COUNT 128
#endif /* __ASM_MACH_IP27_IRQ_H */
......@@ -8,20 +8,11 @@
#define pa_to_nid(addr) NASID_TO_COMPACT_NODEID(NASID_GET(addr))
#define LEVELS_PER_SLICE 128
struct slice_data {
unsigned long irq_enable_mask[2];
int level_to_irq[LEVELS_PER_SLICE];
};
struct hub_data {
kern_vars_t kern_vars;
DECLARE_BITMAP(h_bigwin_used, HUB_NUM_BIG_WINDOW);
cpumask_t h_cpus;
unsigned long slice_map;
unsigned long irq_alloc_mask[2];
struct slice_data slice[2];
};
struct node_data {
......
......@@ -808,7 +808,6 @@ struct bridge_controller {
struct bridge_regs *base;
nasid_t nasid;
unsigned int widget_id;
unsigned int irq_cpu;
u64 baddr;
unsigned int pci_int[8];
};
......@@ -823,8 +822,7 @@ struct bridge_controller {
#define bridge_clr(bc, reg, val) \
__raw_writel(__raw_readl(&bc->base->reg) & ~(val), &bc->base->reg)
extern void register_bridge_irq(unsigned int irq);
extern int request_bridge_irq(struct bridge_controller *bc);
extern int request_bridge_irq(struct bridge_controller *bc, int pin);
extern struct pci_ops bridge_pci_ops;
......
......@@ -23,23 +23,12 @@
*/
#define MAX_PCI_BUSSES 40
/*
* Max #PCI devices (like scsi controllers) we handle on a bus.
*/
#define MAX_DEVICES_PER_PCIBUS 8
/*
* XXX: No kmalloc available when we do our crosstalk scan,
* we should try to move it later in the boot process.
*/
static struct bridge_controller bridges[MAX_PCI_BUSSES];
/*
* Translate from irq to software PCI bus number and PCI slot.
*/
struct bridge_controller *irq_to_bridge[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
int irq_to_slot[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
extern struct pci_ops bridge_pci_ops;
int bridge_probe(nasid_t nasid, int widget_id, int masterwid)
......@@ -77,7 +66,6 @@ int bridge_probe(nasid_t nasid, int widget_id, int masterwid)
bc->io.end = ~0UL;
bc->io.flags = IORESOURCE_IO;
bc->irq_cpu = smp_processor_id();
bc->widget_id = widget_id;
bc->nasid = nasid;
......@@ -165,16 +153,12 @@ int pcibios_plat_dev_init(struct pci_dev *dev)
irq = bc->pci_int[slot];
if (irq == -1) {
irq = request_bridge_irq(bc);
irq = request_bridge_irq(bc, slot);
if (irq < 0)
return irq;
bc->pci_int[slot] = irq;
}
irq_to_bridge[irq] = bc;
irq_to_slot[irq] = slot;
dev->irq = irq;
return 0;
......
......@@ -3,10 +3,9 @@
# Makefile for the IP27 specific kernel interface routines under Linux.
#
obj-y := ip27-berr.o ip27-irq.o ip27-irqno.o ip27-init.o ip27-klconfig.o \
obj-y := ip27-berr.o ip27-irq.o ip27-init.o ip27-klconfig.o \
ip27-klnuma.o ip27-memory.o ip27-nmi.o ip27-reset.o ip27-timer.o \
ip27-hubio.o ip27-xtalk.o
obj-$(CONFIG_EARLY_PRINTK) += ip27-console.o
obj-$(CONFIG_PCI) += ip27-irq-pci.o
obj-$(CONFIG_SMP) += ip27-smp.o
......@@ -56,7 +56,6 @@ static void per_hub_init(cnodeid_t cnode)
{
struct hub_data *hub = hub_data(cnode);
nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
int i;
cpumask_set_cpu(smp_processor_id(), &hub->h_cpus);
......@@ -87,24 +86,6 @@ static void per_hub_init(cnodeid_t cnode)
__flush_cache_all();
}
#endif
/*
* Some interrupts are reserved by hardware or by software convention.
* Mark these as reserved right away so they won't be used accidentally
* later.
*/
for (i = 0; i <= BASE_PCI_IRQ; i++) {
__set_bit(i, hub->irq_alloc_mask);
LOCAL_HUB_CLR_INTR(INT_PEND0_BASELVL + i);
}
__set_bit(IP_PEND0_6_63, hub->irq_alloc_mask);
LOCAL_HUB_S(PI_INT_PEND_MOD, IP_PEND0_6_63);
for (i = NI_BRDCAST_ERR_A; i <= MSC_PANIC_INTR; i++) {
__set_bit(i, hub->irq_alloc_mask);
LOCAL_HUB_CLR_INTR(INT_PEND1_BASELVL + i);
}
}
void per_cpu_init(void)
......@@ -113,8 +94,6 @@ void per_cpu_init(void)
int slice = LOCAL_HUB_L(PI_CPU_NUM);
cnodeid_t cnode = get_compact_nodeid();
struct hub_data *hub = hub_data(cnode);
struct slice_data *si = hub->slice + slice;
int i;
if (test_and_set_bit(slice, &hub->slice_map))
return;
......@@ -123,22 +102,14 @@ void per_cpu_init(void)
per_hub_init(cnode);
for (i = 0; i < LEVELS_PER_SLICE; i++)
si->level_to_irq[i] = -1;
/*
* We use this so we can find the local hub's data as fast as only
* possible.
*/
cpu_data[cpu].data = si;
cpu_time_init();
install_ipi();
/* Install our NMI handler if symmon hasn't installed one. */
install_cpu_nmi_handler(cputoslice(cpu));
set_c0_status(SRB_DEV0 | SRB_DEV1);
enable_percpu_irq(IP27_HUB_PEND0_IRQ, IRQ_TYPE_NONE);
enable_percpu_irq(IP27_HUB_PEND1_IRQ, IRQ_TYPE_NONE);
}
/*
......
// SPDX-License-Identifier: GPL-2.0
/*
* ip27-irq.c: Highlevel interrupt handling for IP27 architecture.
*
* Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 1999 - 2001 Kanoj Sarcar
*/
#undef DEBUG
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/smp.h>
#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/processor.h>
#include <asm/pci/bridge.h>
#include <asm/sn/addrs.h>
#include <asm/sn/agent.h>
#include <asm/sn/arch.h>
#include <asm/sn/hub.h>
#include <asm/sn/intr.h>
/*
* Linux has a controller-independent x86 interrupt architecture.
* every controller has a 'controller-template', that is used
* by the main code to do the right thing. Each driver-visible
* interrupt source is transparently wired to the appropriate
* controller. Thus drivers need not be aware of the
* interrupt-controller.
*
* Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC,
* PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC.
* (IO-APICs assumed to be messaging to Pentium local-APICs)
*
* the code is designed to be easily extended with new/different
* interrupt controllers, without having to do assembly magic.
*/
extern struct bridge_controller *irq_to_bridge[];
extern int irq_to_slot[];
/*
* use these macros to get the encoded nasid and widget id
* from the irq value
*/
#define IRQ_TO_BRIDGE(i) irq_to_bridge[(i)]
#define SLOT_FROM_PCI_IRQ(i) irq_to_slot[i]
static inline int alloc_level(int cpu, int irq)
{
struct hub_data *hub = hub_data(cpu_to_node(cpu));
struct slice_data *si = cpu_data[cpu].data;
int level;
level = find_first_zero_bit(hub->irq_alloc_mask, LEVELS_PER_SLICE);
if (level >= LEVELS_PER_SLICE)
panic("Cpu %d flooded with devices", cpu);
__set_bit(level, hub->irq_alloc_mask);
si->level_to_irq[level] = irq;
return level;
}
static inline int find_level(cpuid_t *cpunum, int irq)
{
int cpu, i;
for_each_online_cpu(cpu) {
struct slice_data *si = cpu_data[cpu].data;
for (i = BASE_PCI_IRQ; i < LEVELS_PER_SLICE; i++)
if (si->level_to_irq[i] == irq) {
*cpunum = cpu;
return i;
}
}
panic("Could not identify cpu/level for irq %d", irq);
}
static int intr_connect_level(int cpu, int bit)
{
nasid_t nasid = COMPACT_TO_NASID_NODEID(cpu_to_node(cpu));
struct slice_data *si = cpu_data[cpu].data;
set_bit(bit, si->irq_enable_mask);
if (!cputoslice(cpu)) {
REMOTE_HUB_S(nasid, PI_INT_MASK0_A, si->irq_enable_mask[0]);
REMOTE_HUB_S(nasid, PI_INT_MASK1_A, si->irq_enable_mask[1]);
} else {
REMOTE_HUB_S(nasid, PI_INT_MASK0_B, si->irq_enable_mask[0]);
REMOTE_HUB_S(nasid, PI_INT_MASK1_B, si->irq_enable_mask[1]);
}
return 0;
}
static int intr_disconnect_level(int cpu, int bit)
{
nasid_t nasid = COMPACT_TO_NASID_NODEID(cpu_to_node(cpu));
struct slice_data *si = cpu_data[cpu].data;
clear_bit(bit, si->irq_enable_mask);
if (!cputoslice(cpu)) {
REMOTE_HUB_S(nasid, PI_INT_MASK0_A, si->irq_enable_mask[0]);
REMOTE_HUB_S(nasid, PI_INT_MASK1_A, si->irq_enable_mask[1]);
} else {
REMOTE_HUB_S(nasid, PI_INT_MASK0_B, si->irq_enable_mask[0]);
REMOTE_HUB_S(nasid, PI_INT_MASK1_B, si->irq_enable_mask[1]);
}
return 0;
}
/* Startup one of the (PCI ...) IRQs routes over a bridge. */
static unsigned int startup_bridge_irq(struct irq_data *d)
{
struct bridge_controller *bc;
int pin, swlevel;
cpuid_t cpu;
u64 device;
pin = SLOT_FROM_PCI_IRQ(d->irq);
bc = IRQ_TO_BRIDGE(d->irq);
pr_debug("bridge_startup(): irq= 0x%x pin=%d\n", d->irq, pin);
/*
* "map" irq to a swlevel greater than 6 since the first 6 bits
* of INT_PEND0 are taken
*/
swlevel = find_level(&cpu, d->irq);
bridge_write(bc, b_int_addr[pin].addr,
(0x20000 | swlevel | (bc->nasid << 8)));
bridge_set(bc, b_int_enable, (1 << pin));
bridge_set(bc, b_int_enable, 0x7ffffe00); /* more stuff in int_enable */
/*
* Enable sending of an interrupt clear packt to the hub on a high to
* low transition of the interrupt pin.
*
* IRIX sets additional bits in the address which are documented as
* reserved in the bridge docs.
*/
bridge_set(bc, b_int_mode, (1UL << pin));
/*
* We assume the bridge to have a 1:1 mapping between devices
* (slots) and intr pins.
*/
device = bridge_read(bc, b_int_device);
device &= ~(7 << (pin*3));
device |= (pin << (pin*3));
bridge_write(bc, b_int_device, device);
bridge_read(bc, b_wid_tflush);
intr_connect_level(cpu, swlevel);
return 0; /* Never anything pending. */
}
/* Shutdown one of the (PCI ...) IRQs routes over a bridge. */
static void shutdown_bridge_irq(struct irq_data *d)
{
struct bridge_controller *bc = IRQ_TO_BRIDGE(d->irq);
int pin, swlevel;
cpuid_t cpu;
pr_debug("bridge_shutdown: irq 0x%x\n", d->irq);
pin = SLOT_FROM_PCI_IRQ(d->irq);
/*
* map irq to a swlevel greater than 6 since the first 6 bits
* of INT_PEND0 are taken
*/
swlevel = find_level(&cpu, d->irq);
intr_disconnect_level(cpu, swlevel);
bridge_clr(bc, b_int_enable, (1 << pin));
bridge_read(bc, b_wid_tflush);
}
static inline void enable_bridge_irq(struct irq_data *d)
{
cpuid_t cpu;
int swlevel;
swlevel = find_level(&cpu, d->irq); /* Criminal offence */
intr_connect_level(cpu, swlevel);
}
static inline void disable_bridge_irq(struct irq_data *d)
{
cpuid_t cpu;
int swlevel;
swlevel = find_level(&cpu, d->irq); /* Criminal offence */
intr_disconnect_level(cpu, swlevel);
}
static struct irq_chip bridge_irq_type = {
.name = "bridge",
.irq_startup = startup_bridge_irq,
.irq_shutdown = shutdown_bridge_irq,
.irq_mask = disable_bridge_irq,
.irq_unmask = enable_bridge_irq,
};
void register_bridge_irq(unsigned int irq)
{
irq_set_chip_and_handler(irq, &bridge_irq_type, handle_level_irq);
}
int request_bridge_irq(struct bridge_controller *bc)
{
int irq = allocate_irqno();
int swlevel, cpu;
nasid_t nasid;
if (irq < 0)
return irq;
/*
* "map" irq to a swlevel greater than 6 since the first 6 bits
* of INT_PEND0 are taken
*/
cpu = bc->irq_cpu;
swlevel = alloc_level(cpu, irq);
if (unlikely(swlevel < 0)) {
free_irqno(irq);
return -EAGAIN;
}
/* Make sure it's not already pending when we connect it. */
nasid = COMPACT_TO_NASID_NODEID(cpu_to_node(cpu));
REMOTE_HUB_CLR_INTR(nasid, swlevel);
intr_connect_level(cpu, swlevel);
register_bridge_irq(irq);
return irq;
}
......@@ -7,67 +7,234 @@
* Copyright (C) 1999 - 2001 Kanoj Sarcar
*/
#undef DEBUG
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/smp.h>
#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/processor.h>
#include <asm/irq_cpu.h>
#include <asm/pci/bridge.h>
#include <asm/sn/addrs.h>
#include <asm/sn/agent.h>
#include <asm/sn/arch.h>
#include <asm/sn/hub.h>
#include <asm/sn/intr.h>
/*
* Linux has a controller-independent x86 interrupt architecture.
* every controller has a 'controller-template', that is used
* by the main code to do the right thing. Each driver-visible
* interrupt source is transparently wired to the appropriate
* controller. Thus drivers need not be aware of the
* interrupt-controller.
*
* Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC,
* PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC.
* (IO-APICs assumed to be messaging to Pentium local-APICs)
*
* the code is designed to be easily extended with new/different
* interrupt controllers, without having to do assembly magic.
*/
struct hub_irq_data {
struct bridge_controller *bc;
u64 *irq_mask[2];
cpuid_t cpu;
int bit;
int pin;
};
extern asmlinkage void ip27_irq(void);
static DECLARE_BITMAP(hub_irq_map, IP27_HUB_IRQ_COUNT);
/*
* Find first bit set
*/
static int ms1bit(unsigned long x)
static DEFINE_PER_CPU(unsigned long [2], irq_enable_mask);
static inline int alloc_level(void)
{
int level;
again:
level = find_first_zero_bit(hub_irq_map, IP27_HUB_IRQ_COUNT);
if (level >= IP27_HUB_IRQ_COUNT)
return -ENOSPC;
if (test_and_set_bit(level, hub_irq_map))
goto again;
return level;
}
static void enable_hub_irq(struct irq_data *d)
{
struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
unsigned long *mask = per_cpu(irq_enable_mask, hd->cpu);
set_bit(hd->bit, mask);
__raw_writeq(mask[0], hd->irq_mask[0]);
__raw_writeq(mask[1], hd->irq_mask[1]);
}
static void disable_hub_irq(struct irq_data *d)
{
struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
unsigned long *mask = per_cpu(irq_enable_mask, hd->cpu);
clear_bit(hd->bit, mask);
__raw_writeq(mask[0], hd->irq_mask[0]);
__raw_writeq(mask[1], hd->irq_mask[1]);
}
static unsigned int startup_bridge_irq(struct irq_data *d)
{
struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
struct bridge_controller *bc;
nasid_t nasid;
u32 device;
int pin;
if (!hd)
return -EINVAL;
pin = hd->pin;
bc = hd->bc;
nasid = COMPACT_TO_NASID_NODEID(cpu_to_node(hd->cpu));
bridge_write(bc, b_int_addr[pin].addr,
(0x20000 | hd->bit | (nasid << 8)));
bridge_set(bc, b_int_enable, (1 << pin));
bridge_set(bc, b_int_enable, 0x7ffffe00); /* more stuff in int_enable */
/*
* Enable sending of an interrupt clear packt to the hub on a high to
* low transition of the interrupt pin.
*
* IRIX sets additional bits in the address which are documented as
* reserved in the bridge docs.
*/
bridge_set(bc, b_int_mode, (1UL << pin));
/*
* We assume the bridge to have a 1:1 mapping between devices
* (slots) and intr pins.
*/
device = bridge_read(bc, b_int_device);
device &= ~(7 << (pin*3));
device |= (pin << (pin*3));
bridge_write(bc, b_int_device, device);
bridge_read(bc, b_wid_tflush);
enable_hub_irq(d);
return 0; /* Never anything pending. */
}
static void shutdown_bridge_irq(struct irq_data *d)
{
struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
struct bridge_controller *bc;
int pin = hd->pin;
if (!hd)
return;
disable_hub_irq(d);
bc = hd->bc;
bridge_clr(bc, b_int_enable, (1 << pin));
bridge_read(bc, b_wid_tflush);
}
static void setup_hub_mask(struct hub_irq_data *hd, const struct cpumask *mask)
{
nasid_t nasid;
int cpu;
cpu = cpumask_first_and(mask, cpu_online_mask);
nasid = COMPACT_TO_NASID_NODEID(cpu_to_node(cpu));
hd->cpu = cpu;
if (!cputoslice(cpu)) {
hd->irq_mask[0] = REMOTE_HUB_PTR(nasid, PI_INT_MASK0_A);
hd->irq_mask[1] = REMOTE_HUB_PTR(nasid, PI_INT_MASK1_A);
} else {
hd->irq_mask[0] = REMOTE_HUB_PTR(nasid, PI_INT_MASK0_B);
hd->irq_mask[1] = REMOTE_HUB_PTR(nasid, PI_INT_MASK1_B);
}
/* Make sure it's not already pending when we connect it. */
REMOTE_HUB_CLR_INTR(nasid, hd->bit);
}
static int set_affinity_hub_irq(struct irq_data *d, const struct cpumask *mask,
bool force)
{
struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
if (!hd)
return -EINVAL;
if (irqd_is_started(d))
disable_hub_irq(d);
setup_hub_mask(hd, mask);
if (irqd_is_started(d))
startup_bridge_irq(d);
irq_data_update_effective_affinity(d, cpumask_of(hd->cpu));
return 0;
}
static struct irq_chip hub_irq_type = {
.name = "HUB",
.irq_startup = startup_bridge_irq,
.irq_shutdown = shutdown_bridge_irq,
.irq_mask = disable_hub_irq,
.irq_unmask = enable_hub_irq,
.irq_set_affinity = set_affinity_hub_irq,
};
int request_bridge_irq(struct bridge_controller *bc, int pin)
{
int b = 0, s;
struct hub_irq_data *hd;
struct hub_data *hub;
struct irq_desc *desc;
int swlevel;
int irq;
hd = kzalloc(sizeof(*hd), GFP_KERNEL);
if (!hd)
return -ENOMEM;
swlevel = alloc_level();
if (unlikely(swlevel < 0)) {
kfree(hd);
return -EAGAIN;
}
irq = swlevel + IP27_HUB_IRQ_BASE;
hd->bc = bc;
hd->bit = swlevel;
hd->pin = pin;
irq_set_chip_data(irq, hd);
/* use CPU connected to nearest hub */
hub = hub_data(NASID_TO_COMPACT_NODEID(bc->nasid));
setup_hub_mask(hd, &hub->h_cpus);
s = 16; if (x >> 16 == 0) s = 0; b += s; x >>= s;
s = 8; if (x >> 8 == 0) s = 0; b += s; x >>= s;
s = 4; if (x >> 4 == 0) s = 0; b += s; x >>= s;
s = 2; if (x >> 2 == 0) s = 0; b += s; x >>= s;
s = 1; if (x >> 1 == 0) s = 0; b += s;
desc = irq_to_desc(irq);
desc->irq_common_data.node = bc->nasid;
cpumask_copy(desc->irq_common_data.affinity, &hub->h_cpus);
return b;
return irq;
}
void ip27_hub_irq_init(void)
{
int i;
for (i = IP27_HUB_IRQ_BASE;
i < (IP27_HUB_IRQ_BASE + IP27_HUB_IRQ_COUNT); i++)
irq_set_chip_and_handler(i, &hub_irq_type, handle_level_irq);
/*
* Some interrupts are reserved by hardware or by software convention.
* Mark these as reserved right away so they won't be used accidentally
* later.
*/
for (i = 0; i <= BASE_PCI_IRQ; i++)
set_bit(i, hub_irq_map);
set_bit(IP_PEND0_6_63, hub_irq_map);
for (i = NI_BRDCAST_ERR_A; i <= MSC_PANIC_INTR; i++)
set_bit(i, hub_irq_map);
}
/*
......@@ -82,23 +249,19 @@ static int ms1bit(unsigned long x)
* Kanoj 05.13.00
*/
static void ip27_do_irq_mask0(void)
static void ip27_do_irq_mask0(struct irq_desc *desc)
{
int irq, swlevel;
u64 pend0, mask0;
cpuid_t cpu = smp_processor_id();
int pi_int_mask0 =
(cputoslice(cpu) == 0) ? PI_INT_MASK0_A : PI_INT_MASK0_B;
unsigned long *mask = per_cpu(irq_enable_mask, cpu);
u64 pend0;
/* copied from Irix intpend0() */
pend0 = LOCAL_HUB_L(PI_INT_PEND0);
mask0 = LOCAL_HUB_L(pi_int_mask0);
pend0 &= mask0; /* Pick intrs we should look at */
pend0 &= mask[0]; /* Pick intrs we should look at */
if (!pend0)
return;
swlevel = ms1bit(pend0);
#ifdef CONFIG_SMP
if (pend0 & (1UL << CPU_RESCHED_A_IRQ)) {
LOCAL_HUB_CLR_INTR(CPU_RESCHED_A_IRQ);
......@@ -108,106 +271,66 @@ static void ip27_do_irq_mask0(void)
scheduler_ipi();
} else if (pend0 & (1UL << CPU_CALL_A_IRQ)) {
LOCAL_HUB_CLR_INTR(CPU_CALL_A_IRQ);
irq_enter();
generic_smp_call_function_interrupt();
irq_exit();
} else if (pend0 & (1UL << CPU_CALL_B_IRQ)) {
LOCAL_HUB_CLR_INTR(CPU_CALL_B_IRQ);
irq_enter();
generic_smp_call_function_interrupt();
irq_exit();
} else
#endif
{
/* "map" swlevel to irq */
struct slice_data *si = cpu_data[cpu].data;
irq = si->level_to_irq[swlevel];
do_IRQ(irq);
}
generic_handle_irq(__ffs(pend0) + IP27_HUB_IRQ_BASE);
LOCAL_HUB_L(PI_INT_PEND0);
}
static void ip27_do_irq_mask1(void)
static void ip27_do_irq_mask1(struct irq_desc *desc)
{
int irq, swlevel;
u64 pend1, mask1;
cpuid_t cpu = smp_processor_id();
int pi_int_mask1 = (cputoslice(cpu) == 0) ? PI_INT_MASK1_A : PI_INT_MASK1_B;
struct slice_data *si = cpu_data[cpu].data;
unsigned long *mask = per_cpu(irq_enable_mask, cpu);
u64 pend1;
/* copied from Irix intpend0() */
pend1 = LOCAL_HUB_L(PI_INT_PEND1);
mask1 = LOCAL_HUB_L(pi_int_mask1);
pend1 &= mask1; /* Pick intrs we should look at */
pend1 &= mask[1]; /* Pick intrs we should look at */
if (!pend1)
return;
swlevel = ms1bit(pend1);
/* "map" swlevel to irq */
irq = si->level_to_irq[swlevel];
LOCAL_HUB_CLR_INTR(swlevel);
do_IRQ(irq);
generic_handle_irq(__ffs(pend1) + IP27_HUB_IRQ_BASE + 64);
LOCAL_HUB_L(PI_INT_PEND1);
}
static void ip27_prof_timer(void)
{
panic("CPU %d got a profiling interrupt", smp_processor_id());
}
static void ip27_hub_error(void)
{
panic("CPU %d got a hub error interrupt", smp_processor_id());
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned long pending = read_c0_cause() & read_c0_status();
extern unsigned int rt_timer_irq;
if (pending & CAUSEF_IP4)
do_IRQ(rt_timer_irq);
else if (pending & CAUSEF_IP2) /* PI_INT_PEND_0 or CC_PEND_{A|B} */
ip27_do_irq_mask0();
else if (pending & CAUSEF_IP3) /* PI_INT_PEND_1 */
ip27_do_irq_mask1();
else if (pending & CAUSEF_IP5)
ip27_prof_timer();
else if (pending & CAUSEF_IP6)
ip27_hub_error();
}
void __init arch_init_irq(void)
{
}
void install_ipi(void)
{
int slice = LOCAL_HUB_L(PI_CPU_NUM);
int cpu = smp_processor_id();
struct slice_data *si = cpu_data[cpu].data;
struct hub_data *hub = hub_data(cpu_to_node(cpu));
unsigned long *mask = per_cpu(irq_enable_mask, cpu);
int slice = LOCAL_HUB_L(PI_CPU_NUM);
int resched, call;
resched = CPU_RESCHED_A_IRQ + slice;
__set_bit(resched, hub->irq_alloc_mask);
__set_bit(resched, si->irq_enable_mask);
set_bit(resched, mask);
LOCAL_HUB_CLR_INTR(resched);
call = CPU_CALL_A_IRQ + slice;
__set_bit(call, hub->irq_alloc_mask);
__set_bit(call, si->irq_enable_mask);
set_bit(call, mask);
LOCAL_HUB_CLR_INTR(call);
if (slice == 0) {
LOCAL_HUB_S(PI_INT_MASK0_A, si->irq_enable_mask[0]);
LOCAL_HUB_S(PI_INT_MASK1_A, si->irq_enable_mask[1]);
LOCAL_HUB_S(PI_INT_MASK0_A, mask[0]);
LOCAL_HUB_S(PI_INT_MASK1_A, mask[1]);
} else {
LOCAL_HUB_S(PI_INT_MASK0_B, si->irq_enable_mask[0]);
LOCAL_HUB_S(PI_INT_MASK1_B, si->irq_enable_mask[1]);
LOCAL_HUB_S(PI_INT_MASK0_B, mask[0]);
LOCAL_HUB_S(PI_INT_MASK1_B, mask[1]);
}
}
void __init arch_init_irq(void)
{
mips_cpu_irq_init();
ip27_hub_irq_init();
irq_set_percpu_devid(IP27_HUB_PEND0_IRQ);
irq_set_chained_handler(IP27_HUB_PEND0_IRQ, ip27_do_irq_mask0);
irq_set_percpu_devid(IP27_HUB_PEND1_IRQ);
irq_set_chained_handler(IP27_HUB_PEND1_IRQ, ip27_do_irq_mask1);
}
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/types.h>
#include <asm/barrier.h>
static DECLARE_BITMAP(irq_map, NR_IRQS);
int allocate_irqno(void)
{
int irq;
again:
irq = find_first_zero_bit(irq_map, NR_IRQS);
if (irq >= NR_IRQS)
return -ENOSPC;
if (test_and_set_bit(irq, irq_map))
goto again;
return irq;
}
/*
* Allocate the 16 legacy interrupts for i8259 devices. This happens early
* in the kernel initialization so treating allocation failure as BUG() is
* ok.
*/
void __init alloc_legacy_irqno(void)
{
int i;
for (i = 0; i <= 16; i++)
BUG_ON(test_and_set_bit(i, irq_map));
}
void free_irqno(unsigned int irq)
{
smp_mb__before_atomic();
clear_bit(irq, irq_map);
smp_mb__after_atomic();
}
......@@ -38,20 +38,6 @@
#include <asm/sn/sn0/hubio.h>
#include <asm/pci/bridge.h>
static void enable_rt_irq(struct irq_data *d)
{
}
static void disable_rt_irq(struct irq_data *d)
{
}
static struct irq_chip rt_irq_type = {
.name = "SN HUB RT timer",
.irq_mask = disable_rt_irq,
.irq_unmask = enable_rt_irq,
};
static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
{
unsigned int cpu = smp_processor_id();
......@@ -65,8 +51,6 @@ static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
}
unsigned int rt_timer_irq;
static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
static DEFINE_PER_CPU(char [11], hub_rt_name);
......@@ -87,6 +71,7 @@ static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
struct irqaction hub_rt_irqaction = {
.handler = hub_rt_counter_handler,
.percpu_dev_id = &hub_rt_clockevent,
.flags = IRQF_PERCPU | IRQF_TIMER,
.name = "hub-rt",
};
......@@ -107,7 +92,6 @@ void hub_rt_clock_event_init(void)
unsigned int cpu = smp_processor_id();
struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
unsigned char *name = per_cpu(hub_rt_name, cpu);
int irq = rt_timer_irq;
sprintf(name, "hub-rt %d", cpu);
cd->name = name;
......@@ -118,29 +102,19 @@ void hub_rt_clock_event_init(void)
cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
cd->min_delta_ticks = 0x300;
cd->rating = 200;
cd->irq = irq;
cd->irq = IP27_RT_TIMER_IRQ;
cd->cpumask = cpumask_of(cpu);
cd->set_next_event = rt_next_event;
clockevents_register_device(cd);
enable_percpu_irq(IP27_RT_TIMER_IRQ, IRQ_TYPE_NONE);
}
static void __init hub_rt_clock_event_global_init(void)
{
int irq;
do {
smp_wmb();
irq = rt_timer_irq;
if (irq)
break;
irq = allocate_irqno();
if (irq < 0)
panic("Allocation of irq number for timer failed");
} while (xchg(&rt_timer_irq, irq));
irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
setup_irq(irq, &hub_rt_irqaction);
irq_set_handler(IP27_RT_TIMER_IRQ, handle_percpu_devid_irq);
irq_set_percpu_devid(IP27_RT_TIMER_IRQ);
setup_percpu_irq(IP27_RT_TIMER_IRQ, &hub_rt_irqaction);
}
static u64 hub_rt_read(struct clocksource *cs)
......@@ -194,8 +168,6 @@ void cpu_time_init(void)
panic("No information about myself?");
printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
set_c0_status(SRB_TIMOCLK);
}
void hub_rtc_init(cnodeid_t cnode)
......
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