static unsigned int startup_sb1250_irq(unsigned int irq);
static void ack_sb1250_irq(unsigned int irq);
#ifdef CONFIG_SMP
-static void sb1250_set_affinity(unsigned int irq, unsigned long mask);
+static void sb1250_set_affinity(unsigned int irq, cpumask_t mask);
#endif
#ifdef CONFIG_SIBYTE_HAS_LDT
#endif
#ifdef CONFIG_KGDB
-#include <asm/gdb-stub.h>
-extern void breakpoint(void);
static int kgdb_irq;
-/* kgdb is on when configured. Pass "nokgdb" kernel arg to turn it off */
-static int kgdb_flag = 1;
-static int __init nokgdb(char *str)
-{
- kgdb_flag = 0;
- return 1;
-}
-__setup("nokgdb", nokgdb);
-
/* Default to UART1 */
int kgdb_port = 1;
#ifdef CONFIG_SIBYTE_SB1250_DUART
#endif
static struct hw_interrupt_type sb1250_irq_type = {
- "SB1250-IMR",
- startup_sb1250_irq,
- shutdown_sb1250_irq,
- enable_sb1250_irq,
- disable_sb1250_irq,
- ack_sb1250_irq,
- end_sb1250_irq,
+ .typename = "SB1250-IMR",
+ .startup = startup_sb1250_irq,
+ .shutdown = shutdown_sb1250_irq,
+ .enable = enable_sb1250_irq,
+ .disable = disable_sb1250_irq,
+ .ack = ack_sb1250_irq,
+ .end = end_sb1250_irq,
#ifdef CONFIG_SMP
- sb1250_set_affinity
-#else
- NULL
+ .set_affinity = sb1250_set_affinity
#endif
};
/* Store the CPU id (not the logical number) */
int sb1250_irq_owner[SB1250_NR_IRQS];
-spinlock_t sb1250_imr_lock = SPIN_LOCK_UNLOCKED;
+DEFINE_SPINLOCK(sb1250_imr_lock);
void sb1250_mask_irq(int cpu, int irq)
{
u64 cur_ints;
spin_lock_irqsave(&sb1250_imr_lock, flags);
- cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) + R_IMR_INTERRUPT_MASK));
+ cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
cur_ints |= (((u64) 1) << irq);
- ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) + R_IMR_INTERRUPT_MASK));
+ ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
spin_unlock_irqrestore(&sb1250_imr_lock, flags);
}
u64 cur_ints;
spin_lock_irqsave(&sb1250_imr_lock, flags);
- cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) + R_IMR_INTERRUPT_MASK));
+ cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
cur_ints &= ~(((u64) 1) << irq);
- ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) + R_IMR_INTERRUPT_MASK));
+ ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
spin_unlock_irqrestore(&sb1250_imr_lock, flags);
}
#ifdef CONFIG_SMP
-static void sb1250_set_affinity(unsigned int irq, unsigned long mask)
+static void sb1250_set_affinity(unsigned int irq, cpumask_t mask)
{
int i = 0, old_cpu, cpu, int_on;
u64 cur_ints;
irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
- while (mask) {
- if (mask & 1) {
- mask >>= 1;
- break;
- }
- mask >>= 1;
- i++;
- }
+ i = first_cpu(mask);
- if (mask) {
+ if (cpus_weight(mask) > 1) {
printk("attempted to set irq affinity for irq %d to multiple CPUs\n", irq);
return;
}
/* Swizzle each CPU's IMR (but leave the IP selection alone) */
old_cpu = sb1250_irq_owner[irq];
- cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(old_cpu) + R_IMR_INTERRUPT_MASK));
+ cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(old_cpu) +
+ R_IMR_INTERRUPT_MASK));
int_on = !(cur_ints & (((u64) 1) << irq));
if (int_on) {
/* If it was on, mask it */
cur_ints |= (((u64) 1) << irq);
- ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(old_cpu) + R_IMR_INTERRUPT_MASK));
+ ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(old_cpu) +
+ R_IMR_INTERRUPT_MASK));
}
sb1250_irq_owner[irq] = cpu;
if (int_on) {
/* unmask for the new CPU */
- cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) + R_IMR_INTERRUPT_MASK));
+ cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
cur_ints &= ~(((u64) 1) << irq);
- ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) + R_IMR_INTERRUPT_MASK));
+ ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
}
spin_unlock(&sb1250_imr_lock);
spin_unlock_irqrestore(&desc->lock, flags);
}
#endif
-
-/* Defined in arch/mips/sibyte/sb1250/irq_handler.S */
-extern void sb1250_irq_handler(void);
-
/*****************************************************************************/
static unsigned int startup_sb1250_irq(unsigned int irq)
* Clear for all CPUs so an affinity switch
* doesn't find an old status
*/
- __raw_writeq(pending,
- IOADDR(A_IMR_REGISTER(cpu, R_IMR_LDT_INTERRUPT_CLR)));
+ __raw_writeq(pending,
+ IOADDR(A_IMR_REGISTER(cpu,
+ R_IMR_LDT_INTERRUPT_CLR)));
}
/*
}
/*
- * init_IRQ is called early in the boot sequence from init/main.c. It
- * is responsible for setting up the interrupt mapper and installing the
- * handler that will be responsible for dispatching interrupts to the
- * "right" place.
+ * arch_init_irq is called early in the boot sequence from init/main.c via
+ * init_IRQ. It is responsible for setting up the interrupt mapper and
+ * installing the handler that will be responsible for dispatching interrupts
+ * to the "right" place.
*/
/*
* For now, map all interrupts to IP[2]. We could save
#define IMR_IP5_VAL K_INT_MAP_I3
#define IMR_IP6_VAL K_INT_MAP_I4
-void __init init_IRQ(void)
+void __init arch_init_irq(void)
{
unsigned int i;
(i << 3)));
__raw_writeq(IMR_IP2_VAL,
IOADDR(A_IMR_REGISTER(1,
- R_IMR_INTERRUPT_MAP_BASE) +
+ R_IMR_INTERRUPT_MAP_BASE) +
(i << 3)));
}
* inter-cpu messages
*/
/* Was I1 */
- __raw_writeq(IMR_IP3_VAL, IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
- (K_INT_MBOX_0 << 3)));
- __raw_writeq(IMR_IP3_VAL, IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MAP_BASE) +
- (K_INT_MBOX_0 << 3)));
+ __raw_writeq(IMR_IP3_VAL,
+ IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
+ (K_INT_MBOX_0 << 3)));
+ __raw_writeq(IMR_IP3_VAL,
+ IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MAP_BASE) +
+ (K_INT_MBOX_0 << 3)));
/* Clear the mailboxes. The firmware may leave them dirty */
- __raw_writeq(0xffffffffffffffff,
+ __raw_writeq(0xffffffffffffffffULL,
IOADDR(A_IMR_REGISTER(0, R_IMR_MAILBOX_CLR_CPU)));
- __raw_writeq(0xffffffffffffffff,
+ __raw_writeq(0xffffffffffffffffULL,
IOADDR(A_IMR_REGISTER(1, R_IMR_MAILBOX_CLR_CPU)));
/* Mask everything except the mailbox registers for both cpus */
/*
* Note that the timer interrupts are also mapped, but this is
- * done in sb1250_time_init(). Also, the profiling driver
+ * done in sb1250_time_init(). Also, the profiling driver
* does its own management of IP7.
*/
#endif
/* Enable necessary IPs, disable the rest */
change_c0_status(ST0_IM, imask);
- set_except_vector(0, sb1250_irq_handler);
#ifdef CONFIG_KGDB
if (kgdb_flag) {
kgdb_irq = K_INT_UART_0 + kgdb_port;
-#ifdef CONFIG_SIBYTE_SB1250_DUART
+#ifdef CONFIG_SIBYTE_SB1250_DUART
sb1250_duart_present[kgdb_port] = 0;
#endif
/* Setup uart 1 settings, mapper */
- __raw_writeq(M_DUART_IMR_BRK, IOADDR(A_DUART_IMRREG(kgdb_port)));
+ __raw_writeq(M_DUART_IMR_BRK,
+ IOADDR(A_DUART_IMRREG(kgdb_port)));
sb1250_steal_irq(kgdb_irq);
__raw_writeq(IMR_IP6_VAL,
- IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
- (kgdb_irq<<3)));
+ IOADDR(A_IMR_REGISTER(0,
+ R_IMR_INTERRUPT_MAP_BASE) +
+ (kgdb_irq << 3)));
sb1250_unmask_irq(0, kgdb_irq);
-
- prom_printf("Waiting for GDB on UART port %d\n", kgdb_port);
- set_debug_traps();
- breakpoint();
}
#endif
}
#define duart_out(reg, val) csr_out32(val, IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
#define duart_in(reg) csr_in32(IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
-void sb1250_kgdb_interrupt(struct pt_regs *regs)
+static void sb1250_kgdb_interrupt(struct pt_regs *regs)
{
/*
* Clear break-change status (allow some time for the remote
}
#endif /* CONFIG_KGDB */
+
+static inline int dclz(unsigned long long x)
+{
+ int lz;
+
+ __asm__ (
+ " .set push \n"
+ " .set mips64 \n"
+ " dclz %0, %1 \n"
+ " .set pop \n"
+ : "=r" (lz)
+ : "r" (x));
+
+ return lz;
+}
+
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+ unsigned int pending;
+
+#ifdef CONFIG_SIBYTE_SB1250_PROF
+ /* Set compare to count to silence count/compare timer interrupts */
+ write_c0_count(read_c0_count());
+#endif
+
+ /*
+ * What a pain. We have to be really careful saving the upper 32 bits
+ * of any * register across function calls if we don't want them
+ * trashed--since were running in -o32, the calling routing never saves
+ * the full 64 bits of a register across a function call. Being the
+ * interrupt handler, we're guaranteed that interrupts are disabled
+ * during this code so we don't have to worry about random interrupts
+ * blasting the high 32 bits.
+ */
+
+ pending = read_c0_cause();
+
+#ifdef CONFIG_SIBYTE_SB1250_PROF
+ if (pending & CAUSEF_IP7) { /* Cpu performance counter interrupt */
+ sbprof_cpu_intr(exception_epc(regs));
+ }
+#endif
+
+ if (pending & CAUSEF_IP4)
+ sb1250_timer_interrupt(regs);
+
+#ifdef CONFIG_SMP
+ if (pending & CAUSEF_IP3)
+ sb1250_mailbox_interrupt(regs);
+#endif
+
+#ifdef CONFIG_KGDB
+ if (pending & CAUSEF_IP6) /* KGDB (uart 1) */
+ sb1250_kgdb_interrupt(regs);
+#endif
+
+ if (pending & CAUSEF_IP2) {
+ unsigned long long mask;
+
+ /*
+ * Default...we've hit an IP[2] interrupt, which means we've
+ * got to check the 1250 interrupt registers to figure out what
+ * to do. Need to detect which CPU we're on, now that
+ ~ smp_affinity is supported.
+ */
+ mask = __raw_readq(IOADDR(A_IMR_REGISTER(smp_processor_id(),
+ R_IMR_INTERRUPT_STATUS_BASE)));
+ if (mask)
+ do_IRQ(63 - dclz(mask), regs);
+ }
+}
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