* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 1999 - 2001 Kanoj Sarcar
*/
+
+#undef DEBUG
+
#include <linux/config.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/smp_lock.h>
+#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
+#include <linux/bitops.h>
-#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/sn/hub.h>
#include <asm/sn/intr.h>
-#undef DEBUG_IRQ
-#ifdef DEBUG_IRQ
-#define DBG(x...) printk(x)
-#else
-#define DBG(x...)
-#endif
-
/*
* Linux has a controller-independent x86 interrupt architecture.
* every controller has a 'controller-template', that is used
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; /* pre-allocated entries */
+ int level;
- level = find_first_zero_bit(si->irq_alloc_mask, LEVELS_PER_SLICE);
+ level = find_first_zero_bit(hub->irq_alloc_mask, LEVELS_PER_SLICE);
if (level >= LEVELS_PER_SLICE)
panic("Cpu %d flooded with devices\n", cpu);
- __set_bit(level, si->irq_alloc_mask);
+ __set_bit(level, hub->irq_alloc_mask);
si->level_to_irq[level] = irq;
return level;
if (!pend0)
return;
- /* Prevent any of the picked intrs from recursing */
- LOCAL_HUB_S(pi_int_mask0, mask0 & ~pend0);
-
swlevel = ms1bit(pend0);
#ifdef CONFIG_SMP
if (pend0 & (1UL << CPU_RESCHED_A_IRQ)) {
do_IRQ(irq, regs);
}
- /* clear bit in pend0 */
- pend0 ^= 1UL << swlevel;
-
- /* Now allow the set of serviced intrs again */
- LOCAL_HUB_S(pi_int_mask0, mask0);
LOCAL_HUB_L(PI_INT_PEND0);
}
if (!pend1)
return;
- /* Prevent any of the picked intrs from recursing */
- LOCAL_HUB_S(pi_int_mask1, mask1 & ~pend1);
-
swlevel = ms1bit(pend1);
/* "map" swlevel to irq */
irq = si->level_to_irq[swlevel];
LOCAL_HUB_CLR_INTR(swlevel);
do_IRQ(irq, regs);
- /* clear bit in pend1 */
- pend1 ^= 1UL << swlevel;
- /* Now allow the set of serviced intrs again */
- LOCAL_HUB_S(pi_int_mask1, mask1);
LOCAL_HUB_L(PI_INT_PEND1);
}
{
nasid_t nasid = COMPACT_TO_NASID_NODEID(cpu_to_node(cpu));
struct slice_data *si = cpu_data[cpu].data;
+ unsigned long flags;
- __set_bit(bit, si->irq_enable_mask);
-
- /* Make sure it's not already pending when we connect it. */
- REMOTE_HUB_CLR_INTR(nasid, bit);
+ set_bit(bit, si->irq_enable_mask);
+ local_irq_save(flags);
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]);
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]);
}
+ local_irq_restore(flags);
return 0;
}
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);
+ clear_bit(bit, si->irq_enable_mask);
if (!cputoslice(cpu)) {
REMOTE_HUB_S(nasid, PI_INT_MASK0_A, si->irq_enable_mask[0]);
bridgereg_t device;
bridge_t *bridge;
int pin, swlevel;
+ cpuid_t cpu;
pin = SLOT_FROM_PCI_IRQ(irq);
bc = IRQ_TO_BRIDGE(irq);
bridge = bc->base;
- DBG("bridge_startup(): irq= 0x%x pin=%d\n", irq, pin);
+ pr_debug("bridge_startup(): irq= 0x%x pin=%d\n", irq, pin);
/*
* "map" irq to a swlevel greater than 6 since the first 6 bits
* of INT_PEND0 are taken
*/
- swlevel = alloc_level(bc->irq_cpu, irq);
- intr_connect_level(bc->irq_cpu, swlevel);
-
+ swlevel = find_level(&cpu, irq);
bridge->b_int_addr[pin].addr = (0x20000 | swlevel | (bc->nasid << 8));
bridge->b_int_enable |= (1 << pin);
- /* more stuff in int_enable reg */
- bridge->b_int_enable |= 0x7ffffe00;
+ bridge->b_int_enable |= 0x7ffffe00; /* more stuff in int_enable */
/*
* Enable sending of an interrupt clear packt to the hub on a high to
device |= (pin << (pin*3));
bridge->b_int_device = device;
- bridge->b_widget.w_tflush; /* Flush */
+ bridge->b_wid_tflush;
return 0; /* Never anything pending. */
}
static void shutdown_bridge_irq(unsigned int irq)
{
struct bridge_controller *bc = IRQ_TO_BRIDGE(irq);
+ struct hub_data *hub = hub_data(cpu_to_node(bc->irq_cpu));
bridge_t *bridge = bc->base;
struct slice_data *si = cpu_data[bc->irq_cpu].data;
int pin, swlevel;
cpuid_t cpu;
- DBG("bridge_shutdown: irq 0x%x\n", irq);
+ pr_debug("bridge_shutdown: irq 0x%x\n", irq);
pin = SLOT_FROM_PCI_IRQ(irq);
/*
swlevel = find_level(&cpu, irq);
intr_disconnect_level(cpu, swlevel);
- __clear_bit(swlevel, si->irq_alloc_mask);
+ __clear_bit(swlevel, hub->irq_alloc_mask);
si->level_to_irq[swlevel] = -1;
bridge->b_int_enable &= ~(1 << pin);
- bridge->b_widget.w_tflush; /* Flush */
+ bridge->b_wid_tflush;
}
static inline void enable_bridge_irq(unsigned int irq)
{
- /* All the braindamage happens magically for us in ip27_do_irq */
+ cpuid_t cpu;
+ int swlevel;
+
+ swlevel = find_level(&cpu, irq); /* Criminal offence */
+ intr_connect_level(cpu, swlevel);
}
-static void disable_bridge_irq(unsigned int irq)
+static inline void disable_bridge_irq(unsigned int irq)
{
- /* All the braindamage happens magically for us in ip27_do_irq */
+ cpuid_t cpu;
+ int swlevel;
+
+ swlevel = find_level(&cpu, irq); /* Criminal offence */
+ intr_disconnect_level(cpu, swlevel);
}
static void mask_and_ack_bridge_irq(unsigned int irq)
{
- /* All the braindamage happens magically for us in ip27_do_irq */
+ disable_bridge_irq(irq);
}
static void end_bridge_irq(unsigned int irq)
{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)) &&
+ irq_desc[irq].action)
+ enable_bridge_irq(irq);
}
static struct hw_interrupt_type bridge_irq_type = {
static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
-unsigned int allocate_irqno(void)
+static int allocate_irqno(void)
{
int irq;
again:
- irq = find_first_zero_bit(irq_map, LEVELS_PER_SLICE);
+ irq = find_first_zero_bit(irq_map, NR_IRQS);
if (irq >= NR_IRQS)
- return -1;
+ return -ENOSPC;
if (test_and_set_bit(irq, irq_map))
goto again;
clear_bit(irq, irq_map);
}
-void __init init_IRQ(void)
+void __devinit register_bridge_irq(unsigned int irq)
{
- int i;
+ irq_desc[irq].status = IRQ_DISABLED;
+ irq_desc[irq].action = 0;
+ irq_desc[irq].depth = 1;
+ irq_desc[irq].handler = &bridge_irq_type;
+}
- set_except_vector(0, ip27_irq);
+int __devinit request_bridge_irq(struct bridge_controller *bc)
+{
+ int irq = allocate_irqno();
+ int swlevel, cpu;
+ nasid_t nasid;
+
+ if (irq < 0)
+ return irq;
/*
- * Right now the bridge irq is our kitchen sink interrupt type
+ * "map" irq to a swlevel greater than 6 since the first 6 bits
+ * of INT_PEND0 are taken
*/
- for (i = 0; i <= NR_IRQS; i++) {
- irq_desc[i].status = IRQ_DISABLED;
- irq_desc[i].action = 0;
- irq_desc[i].depth = 1;
- irq_desc[i].handler = &bridge_irq_type;
+ 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;
+}
+
+void __init arch_init_irq(void)
+{
+ set_except_vector(0, ip27_irq);
}
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;
- hubreg_t mask, set;
+ struct hub_data *hub = hub_data(cpu_to_node(cpu));
+ int resched, call;
+
+ resched = CPU_RESCHED_A_IRQ + slice;
+ __set_bit(resched, hub->irq_alloc_mask);
+ __set_bit(resched, si->irq_enable_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);
+ LOCAL_HUB_CLR_INTR(call);
if (slice == 0) {
- LOCAL_HUB_CLR_INTR(CPU_RESCHED_A_IRQ);
- LOCAL_HUB_CLR_INTR(CPU_CALL_A_IRQ);
- mask = LOCAL_HUB_L(PI_INT_MASK0_A); /* Slice A */
- set = (1UL << CPU_RESCHED_A_IRQ) | (1UL << CPU_CALL_A_IRQ);
- mask |= set;
- si->irq_enable_mask[0] |= set;
- si->irq_alloc_mask[0] |= set;
- LOCAL_HUB_S(PI_INT_MASK0_A, mask);
+ LOCAL_HUB_S(PI_INT_MASK0_A, si->irq_enable_mask[0]);
+ LOCAL_HUB_S(PI_INT_MASK1_A, si->irq_enable_mask[1]);
} else {
- LOCAL_HUB_CLR_INTR(CPU_RESCHED_B_IRQ);
- LOCAL_HUB_CLR_INTR(CPU_CALL_B_IRQ);
- mask = LOCAL_HUB_L(PI_INT_MASK0_B); /* Slice B */
- set = (1UL << CPU_RESCHED_B_IRQ) | (1UL << CPU_CALL_B_IRQ);
- mask |= set;
- si->irq_enable_mask[1] |= set;
- si->irq_alloc_mask[1] |= set;
- LOCAL_HUB_S(PI_INT_MASK0_B, mask);
+ LOCAL_HUB_S(PI_INT_MASK0_B, si->irq_enable_mask[0]);
+ LOCAL_HUB_S(PI_INT_MASK1_B, si->irq_enable_mask[1]);
}
}
git://git.onelab.eu / linux-2.6.git / blobdiff