sh: intc - initial SMP support.

This implements initial support for the SMP INTC (particularly
INTC2) controllers.

These are largely implemented as conventional blocks, with
register sets grouped together at fixed strides relative to
the CPU id.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 69 insertions, 21 deletions

diff --git a/arch/sh/kernel/cpu/irq/intc.c b/arch/sh/kernel/cpu/irq/intc.c
index 481871f..6ac018c 100644
--- a/arch/sh/kernel/cpu/irq/intc.c
+++ b/arch/sh/kernel/cpu/irq/intc.c
@@ -40,6 +40,9 @@ struct intc_handle_int {
 
 struct intc_desc_int {
 	unsigned long *reg;
+#ifdef CONFIG_SMP
+	unsigned long *smp;
+#endif
 	unsigned int nr_reg;
 	struct intc_handle_int *prio;
 	unsigned int nr_prio;
@@ -48,6 +51,16 @@ struct intc_desc_int {
 	struct irq_chip chip;
 };
 
+#ifdef CONFIG_SMP
+#define IS_SMP(x) x.smp
+#define INTC_REG(d, x, c) (d->reg[(x)] + ((d->smp[(x)] & 0xff) * c))
+#define SMP_NR(d, x) ((d->smp[(x)] >> 8) ? (d->smp[(x)] >> 8) : 1)
+#else
+#define IS_SMP(x) 0
+#define INTC_REG(d, x, c) (d->reg[(x)])
+#define SMP_NR(d, x) 1
+#endif
+
 static unsigned int intc_prio_level[NR_IRQS]; /* for now */
 
 static inline struct intc_desc_int *get_intc_desc(unsigned int irq)
@@ -177,11 +190,14 @@ static void (*intc_disable_fns[])(unsigned long addr,
 static inline void _intc_enable(unsigned int irq, unsigned long handle)
 {
 	struct intc_desc_int *d = get_intc_desc(irq);
-	unsigned long addr = d->reg[_INTC_ADDR_E(handle)];
+	unsigned long addr;
+	unsigned int cpu;
 
-	intc_enable_fns[_INTC_MODE(handle)](addr, handle,
-					    intc_reg_fns[_INTC_FN(handle)],
-					    irq);
+	for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
+		addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
+		intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\
+						    [_INTC_FN(handle)], irq);
+	}
 }
 
 static void intc_enable(unsigned int irq)
@@ -191,13 +207,16 @@ static void intc_enable(unsigned int irq)
 
 static void intc_disable(unsigned int irq)
 {
-	struct intc_desc_int *desc = get_intc_desc(irq);
+	struct intc_desc_int *d = get_intc_desc(irq);
 	unsigned long handle = (unsigned long) get_irq_chip_data(irq);
-	unsigned long addr = desc->reg[_INTC_ADDR_D(handle)];
+	unsigned long addr;
+	unsigned int cpu;
 
-	intc_disable_fns[_INTC_MODE(handle)](addr, handle,
-					     intc_reg_fns[_INTC_FN(handle)],
-					     irq);
+	for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
+		addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
+		intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\
+						     [_INTC_FN(handle)], irq);
+	}
 }
 
 static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
@@ -276,7 +295,7 @@ static int intc_set_sense(unsigned int irq, unsigned int type)
 
 	ihp = intc_find_irq(d->sense, d->nr_sense, irq);
 	if (ihp) {
-		addr = d->reg[_INTC_ADDR_E(ihp->handle)];
+		addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0);
 		intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle, value);
 	}
 	return 0;
@@ -536,9 +555,26 @@ static void __init intc_register_irq(struct intc_desc *desc,
 	d->chip.mask(irq);
 }
 
+static unsigned int __init save_reg(struct intc_desc_int *d,
+				    unsigned int cnt,
+				    unsigned long value,
+				    unsigned int smp)
+{
+	if (value) {
+		d->reg[cnt] = value;
+#ifdef CONFIG_SMP
+		d->smp[cnt] = smp;
+#endif
+		return 1;
+	}
+
+	return 0;
+}
+
+
 void __init register_intc_controller(struct intc_desc *desc)
 {
-	unsigned int i, k;
+	unsigned int i, k, smp;
 	struct intc_desc_int *d;
 
 	d = alloc_bootmem(sizeof(*d));
@@ -548,14 +584,16 @@ void __init register_intc_controller(struct intc_desc *desc)
 	d->nr_reg += desc->sense_regs ? desc->nr_sense_regs : 0;
 
 	d->reg = alloc_bootmem(d->nr_reg * sizeof(*d->reg));
+#ifdef CONFIG_SMP
+	d->smp = alloc_bootmem(d->nr_reg * sizeof(*d->smp));
+#endif
 	k = 0;
 
 	if (desc->mask_regs) {
 		for (i = 0; i < desc->nr_mask_regs; i++) {
-			if (desc->mask_regs[i].set_reg)
-				d->reg[k++] = desc->mask_regs[i].set_reg;
-			if (desc->mask_regs[i].clr_reg)
-				d->reg[k++] = desc->mask_regs[i].clr_reg;
+			smp = IS_SMP(desc->mask_regs[i]);
+			k += save_reg(d, k, desc->mask_regs[i].set_reg, smp);
+			k += save_reg(d, k, desc->mask_regs[i].clr_reg, smp);
 		}
 	}
 
@@ -563,10 +601,9 @@ void __init register_intc_controller(struct intc_desc *desc)
 		d->prio = alloc_bootmem(desc->nr_vectors * sizeof(*d->prio));
 
 		for (i = 0; i < desc->nr_prio_regs; i++) {
-			if (desc->prio_regs[i].set_reg)
-				d->reg[k++] = desc->prio_regs[i].set_reg;
-			if (desc->prio_regs[i].clr_reg)
-				d->reg[k++] = desc->prio_regs[i].clr_reg;
+			smp = IS_SMP(desc->prio_regs[i]);
+			k += save_reg(d, k, desc->prio_regs[i].set_reg, smp);
+			k += save_reg(d, k, desc->prio_regs[i].clr_reg, smp);
 		}
 	}
 
@@ -574,8 +611,7 @@ void __init register_intc_controller(struct intc_desc *desc)
 		d->sense = alloc_bootmem(desc->nr_vectors * sizeof(*d->sense));
 
 		for (i = 0; i < desc->nr_sense_regs; i++) {
-			if (desc->sense_regs[i].reg)
-				d->reg[k++] = desc->sense_regs[i].reg;
+			k += save_reg(d, k, desc->sense_regs[i].reg, 0);
 		}
 	}
 
diff --git a/include/asm-sh/hw_irq.h b/include/asm-sh/hw_irq.h
index 96d9710..cb0b6c9 100644
--- a/include/asm-sh/hw_irq.h
+++ b/include/asm-sh/hw_irq.h
@@ -50,11 +50,17 @@ struct intc_group {
 struct intc_mask_reg {
 	unsigned long set_reg, clr_reg, reg_width;
 	intc_enum enum_ids[32];
+#ifdef CONFIG_SMP
+	unsigned long smp;
+#endif
 };
 
 struct intc_prio_reg {
 	unsigned long set_reg, clr_reg, reg_width, field_width;
 	intc_enum enum_ids[16];
+#ifdef CONFIG_SMP
+	unsigned long smp;
+#endif
 };
 
 struct intc_sense_reg {
@@ -62,6 +68,12 @@ struct intc_sense_reg {
 	intc_enum enum_ids[16];
 };
 
+#ifdef CONFIG_SMP
+#define INTC_SMP(stride, nr) .smp = (stride) | ((nr) << 8)
+#else
+#define INTC_SMP(stride, nr)
+#endif
+
 struct intc_desc {
 	struct intc_vect *vectors;
 	unsigned int nr_vectors;