MIPS: Netlogic: Optimize EIMR/EIRR accesses in 32-bit

Provide functions ack_c0_eirr(), set_c0_eimr(), clear_c0_eimr()
and read_c0_eirr_and_eimr() that do the EIMR and EIRR operations
and update the interrupt handling code to use these functions.
Also, use the EIMR register functions to mask interrupts in the
irq code.

The 64-bit interrupt request and mask registers (EIRR and EIMR) are
accessed when the interrupts are off, and the common operations are
to set or clear a bit in these registers. Using the 64-bit c0 access
functions for these operations is not optimal in 32-bit, because it
will disable/restore interrupts and split/join the 64-bit value during
each register access.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4790/
Signed-off-by: John Crispin <blogic@openwrt.org>

2 files changed, 19 insertions, 28 deletions

diff --git a/arch/mips/netlogic/common/irq.c b/arch/mips/netlogic/common/irq.c
index 00dcc7a2bc5a..d42cd1a2a124 100644
--- a/arch/mips/netlogic/common/irq.c
+++ b/arch/mips/netlogic/common/irq.c
@@ -105,21 +105,23 @@ static void xlp_pic_disable(struct irq_data *d)
 static void xlp_pic_mask_ack(struct irq_data *d)
 {
         struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
-        uint64_t mask = 1ull << pd->picirq;
 
-        write_c0_eirr(mask);            /* ack by writing EIRR */
+        clear_c0_eimr(pd->picirq);
+        ack_c0_eirr(pd->picirq);
 }
 
 static void xlp_pic_unmask(struct irq_data *d)
 {
         struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d);
 
-        if (!pd)
-                return;
+        BUG_ON(!pd);
 
         if (pd->extra_ack)
                 pd->extra_ack(d);
 
+        /* re-enable the intr on this cpu */
+        set_c0_eimr(pd->picirq);
+
         /* Ack is a single write, no need to lock */
         nlm_pic_ack(pd->node->picbase, pd->irt);
 }
@@ -134,32 +136,17 @@ static struct irq_chip xlp_pic = {
 
 static void cpuintr_disable(struct irq_data *d)
 {
-        uint64_t eimr;
-        uint64_t mask = 1ull << d->irq;
-
-        eimr = read_c0_eimr();
-        write_c0_eimr(eimr & ~mask);
+        clear_c0_eimr(d->irq);
 }
 
 static void cpuintr_enable(struct irq_data *d)
 {
-        uint64_t eimr;
-        uint64_t mask = 1ull << d->irq;
-
-        eimr = read_c0_eimr();
-        write_c0_eimr(eimr | mask);
+        set_c0_eimr(d->irq);
 }
 
 static void cpuintr_ack(struct irq_data *d)
 {
-        uint64_t mask = 1ull << d->irq;
-
-        write_c0_eirr(mask);
-}
-
-static void cpuintr_nop(struct irq_data *d)
-{
-        WARN(d->irq >= PIC_IRQ_BASE, "Bad irq %d", d->irq);
+        ack_c0_eirr(d->irq);
 }
 
 /*
@@ -170,9 +157,9 @@ struct irq_chip nlm_cpu_intr = {
         .name           = "XLP-CPU-INTR",
         .irq_enable     = cpuintr_enable,
         .irq_disable    = cpuintr_disable,
-        .irq_mask       = cpuintr_nop,
-        .irq_ack        = cpuintr_nop,
-        .irq_eoi        = cpuintr_ack,
+        .irq_mask       = cpuintr_disable,
+        .irq_ack        = cpuintr_ack,
+        .irq_eoi        = cpuintr_enable,
 };
 
 static void __init nlm_init_percpu_irqs(void)
@@ -265,7 +252,7 @@ asmlinkage void plat_irq_dispatch(void)
         int i, node;
 
         node = nlm_nodeid();
-        eirr = read_c0_eirr() & read_c0_eimr();
+        eirr = read_c0_eirr_and_eimr();
 
         i = __ilog2_u64(eirr);
         if (i == -1)
diff --git a/arch/mips/netlogic/common/smp.c b/arch/mips/netlogic/common/smp.c
index a080d9ee3cd7..2bb95dcfe20a 100644
--- a/arch/mips/netlogic/common/smp.c
+++ b/arch/mips/netlogic/common/smp.c
@@ -84,15 +84,19 @@ void nlm_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 /* IRQ_IPI_SMP_FUNCTION Handler */
 void nlm_smp_function_ipi_handler(unsigned int irq, struct irq_desc *desc)
 {
-        write_c0_eirr(1ull << irq);
+        clear_c0_eimr(irq);
+        ack_c0_eirr(irq);
         smp_call_function_interrupt();
+        set_c0_eimr(irq);
 }
 
 /* IRQ_IPI_SMP_RESCHEDULE  handler */
 void nlm_smp_resched_ipi_handler(unsigned int irq, struct irq_desc *desc)
 {
-        write_c0_eirr(1ull << irq);
+        clear_c0_eimr(irq);
+        ack_c0_eirr(irq);
         scheduler_ipi();
+        set_c0_eimr(irq);
 }
 
 /*