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Diffstat (limited to 'arch/mips/sibyte/sb1250/irq.c')
-rw-r--r--arch/mips/sibyte/sb1250/irq.c336
1 files changed, 121 insertions, 215 deletions
diff --git a/arch/mips/sibyte/sb1250/irq.c b/arch/mips/sibyte/sb1250/irq.c
index 2728abbc94d..6d8dba5cf34 100644
--- a/arch/mips/sibyte/sb1250/irq.c
+++ b/arch/mips/sibyte/sb1250/irq.c
@@ -15,7 +15,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/linkage.h>
@@ -23,13 +22,11 @@
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/mm.h>
-#include <linux/slab.h>
#include <linux/kernel_stat.h>
#include <asm/errno.h>
#include <asm/signal.h>
-#include <asm/system.h>
-#include <asm/ptrace.h>
+#include <asm/time.h>
#include <asm/io.h>
#include <asm/sibyte/sb1250_regs.h>
@@ -45,63 +42,27 @@
* for interrupt lines
*/
-
-#define shutdown_sb1250_irq disable_sb1250_irq
-static void end_sb1250_irq(unsigned int irq);
-static void enable_sb1250_irq(unsigned int irq);
-static void disable_sb1250_irq(unsigned int irq);
-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);
-#endif
-
#ifdef CONFIG_SIBYTE_HAS_LDT
extern unsigned long ldt_eoi_space;
#endif
-#ifdef CONFIG_KGDB
-static int kgdb_irq;
-
-/* Default to UART1 */
-int kgdb_port = 1;
-#ifdef CONFIG_SIBYTE_SB1250_DUART
-extern char sb1250_duart_present[];
-#endif
-#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,
-#ifdef CONFIG_SMP
- sb1250_set_affinity
-#else
- NULL
-#endif
-};
-
/* Store the CPU id (not the logical number) */
int sb1250_irq_owner[SB1250_NR_IRQS];
-DEFINE_SPINLOCK(sb1250_imr_lock);
+static DEFINE_RAW_SPINLOCK(sb1250_imr_lock);
void sb1250_mask_irq(int cpu, int irq)
{
unsigned long flags;
u64 cur_ints;
- spin_lock_irqsave(&sb1250_imr_lock, flags);
- cur_ints = __bus_readq(IOADDR(A_IMR_MAPPER(cpu) +
- R_IMR_INTERRUPT_MASK));
+ raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
+ cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
cur_ints |= (((u64) 1) << irq);
- __bus_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
- R_IMR_INTERRUPT_MASK));
- spin_unlock_irqrestore(&sb1250_imr_lock, flags);
+ ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
+ raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
}
void sb1250_unmask_irq(int cpu, int irq)
@@ -109,96 +70,76 @@ void sb1250_unmask_irq(int cpu, int irq)
unsigned long flags;
u64 cur_ints;
- spin_lock_irqsave(&sb1250_imr_lock, flags);
- cur_ints = __bus_readq(IOADDR(A_IMR_MAPPER(cpu) +
- R_IMR_INTERRUPT_MASK));
+ raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
+ cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
cur_ints &= ~(((u64) 1) << irq);
- __bus_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
- R_IMR_INTERRUPT_MASK));
- spin_unlock_irqrestore(&sb1250_imr_lock, flags);
+ ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+ R_IMR_INTERRUPT_MASK));
+ raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
}
#ifdef CONFIG_SMP
-static void sb1250_set_affinity(unsigned int irq, unsigned long mask)
+static int sb1250_set_affinity(struct irq_data *d, const struct cpumask *mask,
+ bool force)
{
int i = 0, old_cpu, cpu, int_on;
+ unsigned int irq = d->irq;
u64 cur_ints;
- irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
- while (mask) {
- if (mask & 1) {
- mask >>= 1;
- break;
- }
- mask >>= 1;
- i++;
- }
-
- if (mask) {
- printk("attempted to set irq affinity for irq %d to multiple CPUs\n", irq);
- return;
- }
+ i = cpumask_first_and(mask, cpu_online_mask);
/* Convert logical CPU to physical CPU */
cpu = cpu_logical_map(i);
/* Protect against other affinity changers and IMR manipulation */
- spin_lock_irqsave(&desc->lock, flags);
- spin_lock(&sb1250_imr_lock);
+ raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
/* Swizzle each CPU's IMR (but leave the IP selection alone) */
old_cpu = sb1250_irq_owner[irq];
- cur_ints = __bus_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);
- __bus_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 = __bus_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);
- __bus_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);
+ raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
+
+ return 0;
}
#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)
+static void disable_sb1250_irq(struct irq_data *d)
{
- sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
-
- return 0; /* never anything pending */
-}
-
+ unsigned int irq = d->irq;
-static void disable_sb1250_irq(unsigned int irq)
-{
sb1250_mask_irq(sb1250_irq_owner[irq], irq);
}
-static void enable_sb1250_irq(unsigned int irq)
+static void enable_sb1250_irq(struct irq_data *d)
{
+ unsigned int irq = d->irq;
+
sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
}
-static void ack_sb1250_irq(unsigned int irq)
+static void ack_sb1250_irq(struct irq_data *d)
{
+ unsigned int irq = d->irq;
#ifdef CONFIG_SIBYTE_HAS_LDT
u64 pending;
@@ -208,8 +149,8 @@ static void ack_sb1250_irq(unsigned int irq)
* deliver the interrupts to all CPUs (which makes affinity
* changing easier for us)
*/
- pending = bus_readq(IOADDR(A_IMR_REGISTER(sb1250_irq_owner[irq],
- R_IMR_LDT_INTERRUPT)));
+ pending = __raw_readq(IOADDR(A_IMR_REGISTER(sb1250_irq_owner[irq],
+ R_IMR_LDT_INTERRUPT)));
pending &= ((u64)1 << (irq));
if (pending) {
int i;
@@ -224,8 +165,8 @@ static void ack_sb1250_irq(unsigned int irq)
* Clear for all CPUs so an affinity switch
* doesn't find an old status
*/
- bus_writeq(pending,
- IOADDR(A_IMR_REGISTER(cpu,
+ __raw_writeq(pending,
+ IOADDR(A_IMR_REGISTER(cpu,
R_IMR_LDT_INTERRUPT_CLR)));
}
@@ -241,69 +182,28 @@ static void ack_sb1250_irq(unsigned int irq)
sb1250_mask_irq(sb1250_irq_owner[irq], irq);
}
-
-static void end_sb1250_irq(unsigned int irq)
-{
- if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
- sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
- }
-}
-
+static struct irq_chip sb1250_irq_type = {
+ .name = "SB1250-IMR",
+ .irq_mask_ack = ack_sb1250_irq,
+ .irq_unmask = enable_sb1250_irq,
+ .irq_mask = disable_sb1250_irq,
+#ifdef CONFIG_SMP
+ .irq_set_affinity = sb1250_set_affinity
+#endif
+};
void __init init_sb1250_irqs(void)
{
int i;
- for (i = 0; i < NR_IRQS; i++) {
- irq_desc[i].status = IRQ_DISABLED;
- irq_desc[i].action = 0;
- irq_desc[i].depth = 1;
- if (i < SB1250_NR_IRQS) {
- irq_desc[i].handler = &sb1250_irq_type;
- sb1250_irq_owner[i] = 0;
- } else {
- irq_desc[i].handler = &no_irq_type;
- }
+ for (i = 0; i < SB1250_NR_IRQS; i++) {
+ irq_set_chip_and_handler(i, &sb1250_irq_type,
+ handle_level_irq);
+ sb1250_irq_owner[i] = 0;
}
}
-static irqreturn_t sb1250_dummy_handler(int irq, void *dev_id,
- struct pt_regs *regs)
-{
- return IRQ_NONE;
-}
-
-static struct irqaction sb1250_dummy_action = {
- .handler = sb1250_dummy_handler,
- .flags = 0,
- .mask = CPU_MASK_NONE,
- .name = "sb1250-private",
- .next = NULL,
- .dev_id = 0
-};
-
-int sb1250_steal_irq(int irq)
-{
- irq_desc_t *desc = irq_desc + irq;
- unsigned long flags;
- int retval = 0;
-
- if (irq >= SB1250_NR_IRQS)
- return -EINVAL;
-
- spin_lock_irqsave(&desc->lock,flags);
- /* Don't allow sharing at all for these */
- if (desc->action != NULL)
- retval = -EBUSY;
- else {
- desc->action = &sb1250_dummy_action;
- desc->depth = 0;
- }
- spin_unlock_irqrestore(&desc->lock,flags);
- return 0;
-}
-
/*
* 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
@@ -321,7 +221,7 @@ int sb1250_steal_irq(int irq)
* On the second cpu, everything is set to IP5, which is
* ignored, EXCEPT the mailbox interrupt. That one is
* set to IP[2] so it is handled. This is needed so we
- * can do cross-cpu function calls, as requred by SMP
+ * can do cross-cpu function calls, as required by SMP
*/
#define IMR_IP2_VAL K_INT_MAP_I0
@@ -340,12 +240,14 @@ void __init arch_init_irq(void)
/* Default everything to IP2 */
for (i = 0; i < SB1250_NR_IRQS; i++) { /* was I0 */
- bus_writeq(IMR_IP2_VAL,
- IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
- (i << 3)));
- bus_writeq(IMR_IP2_VAL,
- IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MAP_BASE) +
- (i << 3)));
+ __raw_writeq(IMR_IP2_VAL,
+ IOADDR(A_IMR_REGISTER(0,
+ R_IMR_INTERRUPT_MAP_BASE) +
+ (i << 3)));
+ __raw_writeq(IMR_IP2_VAL,
+ IOADDR(A_IMR_REGISTER(1,
+ R_IMR_INTERRUPT_MAP_BASE) +
+ (i << 3)));
}
init_sb1250_irqs();
@@ -355,77 +257,81 @@ void __init arch_init_irq(void)
* inter-cpu messages
*/
/* Was I1 */
- bus_writeq(IMR_IP3_VAL,
- IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
- (K_INT_MBOX_0 << 3)));
- bus_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 */
- bus_writeq(0xffffffffffffffffULL,
- IOADDR(A_IMR_REGISTER(0, R_IMR_MAILBOX_CLR_CPU)));
- bus_writeq(0xffffffffffffffffULL,
- IOADDR(A_IMR_REGISTER(1, R_IMR_MAILBOX_CLR_CPU)));
+ __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(0xffffffffffffffffULL,
+ IOADDR(A_IMR_REGISTER(0, R_IMR_MAILBOX_CLR_CPU)));
+ __raw_writeq(0xffffffffffffffffULL,
+ IOADDR(A_IMR_REGISTER(1, R_IMR_MAILBOX_CLR_CPU)));
/* Mask everything except the mailbox registers for both cpus */
tmp = ~((u64) 0) ^ (((u64) 1) << K_INT_MBOX_0);
- bus_writeq(tmp, IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MASK)));
- bus_writeq(tmp, IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MASK)));
-
- sb1250_steal_irq(K_INT_MBOX_0);
+ __raw_writeq(tmp, IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MASK)));
+ __raw_writeq(tmp, IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MASK)));
/*
* 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.
*/
-#ifdef CONFIG_KGDB
- imask |= STATUSF_IP6;
-#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
- sb1250_duart_present[kgdb_port] = 0;
-#endif
- /* Setup uart 1 settings, mapper */
- bus_writeq(M_DUART_IMR_BRK, IOADDR(A_DUART_IMRREG(kgdb_port)));
-
- sb1250_steal_irq(kgdb_irq);
- bus_writeq(IMR_IP6_VAL,
- IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
- (kgdb_irq<<3)));
- sb1250_unmask_irq(0, kgdb_irq);
- }
-#endif
}
-#ifdef CONFIG_KGDB
+extern void sb1250_mailbox_interrupt(void);
-#include <linux/delay.h>
+static inline void dispatch_ip2(void)
+{
+ unsigned int cpu = smp_processor_id();
+ unsigned long long mask;
-#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)))
+ /*
+ * 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(cpu,
+ R_IMR_INTERRUPT_STATUS_BASE)));
+ if (mask)
+ do_IRQ(fls64(mask) - 1);
+}
-void sb1250_kgdb_interrupt(struct pt_regs *regs)
+asmlinkage void plat_irq_dispatch(void)
{
+ unsigned int cpu = smp_processor_id();
+ unsigned int pending;
+
/*
- * Clear break-change status (allow some time for the remote
- * host to stop the break, since we would see another
- * interrupt on the end-of-break too)
+ * 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.
*/
- kstat_this_cpu.irqs[kgdb_irq]++;
- mdelay(500);
- duart_out(R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT |
- M_DUART_RX_EN | M_DUART_TX_EN);
- set_async_breakpoint(&regs->cp0_epc);
-}
-#endif /* CONFIG_KGDB */
+ pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+ if (pending & CAUSEF_IP7) /* CPU performance counter interrupt */
+ do_IRQ(MIPS_CPU_IRQ_BASE + 7);
+ else if (pending & CAUSEF_IP4)
+ do_IRQ(K_INT_TIMER_0 + cpu); /* sb1250_timer_interrupt() */
+
+#ifdef CONFIG_SMP
+ else if (pending & CAUSEF_IP3)
+ sb1250_mailbox_interrupt();
+#endif
+
+ else if (pending & CAUSEF_IP2)
+ dispatch_ip2();
+ else
+ spurious_interrupt();
+}
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