genirq: Generic chip: Add support for per chip type mask cache

Today the same interrupt mask cache (stored within struct irq_chip_generic)
is shared between all the irq_chip_type instances. As there are instances
where each irq_chip_type uses a distinct mask register (as it is the case
for Orion SoCs), sharing a single mask cache may be incorrect.
So add a distinct pointer for each irq_chip_type, which for now
points to the original mask register within irq_chip_generic.
So no functional changes here.

[ tglx: Minor cosmetic tweaks ]

Reported-by: Joey Oravec <[email protected]>
Signed-off-by: Simon Guinot <[email protected]>
Signed-off-by: Holger Brunck <[email protected]>
Signed-off-by: Gerlando Falauto <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: Lennert Buytenhek <[email protected]>
Cc: Russell King - ARM Linux <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Holger Brunck <[email protected]>
Cc: Ezequiel Garcia <[email protected]>
Acked-by: Grant Likely <[email protected]>
Cc: Sebastian Hesselbarth <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: [email protected]
Cc: Rob Herring <[email protected]>
Cc: Ben Dooks <[email protected]>
Cc: Gregory Clement <[email protected]>
Cc: Simon Guinot <[email protected]>
Cc: [email protected]
Cc: Thomas Petazzoni <[email protected]>
Cc: Jean-Francois Moine <[email protected]>
Cc: Nicolas Pitre <[email protected]>
Cc: Rob Landley <[email protected]>
Cc: Maxime Ripard <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

2 files changed, 15 insertions, 7 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index bc4e06611958..38709a3ab1c0 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -644,6 +644,8 @@ struct irq_chip_regs {
  * @regs:		Register offsets for this chip
  * @handler:		Flow handler associated with this chip
  * @type:		Chip can handle these flow types
+ * @mask_cache_priv:	Cached mask register private to the chip type
+ * @mask_cache:		Pointer to cached mask register
  *
  * A irq_generic_chip can have several instances of irq_chip_type when
  * it requires different functions and register offsets for different
@@ -654,6 +656,8 @@ struct irq_chip_type {
 	struct irq_chip_regs	regs;
 	irq_flow_handler_t	handler;
 	u32			type;
+	u32			mask_cache_priv;
+	u32			*mask_cache;
 };
 
 /**
@@ -662,7 +666,7 @@ struct irq_chip_type {
  * @reg_base:		Register base address (virtual)
  * @irq_base:		Interrupt base nr for this chip
  * @irq_cnt:		Number of interrupts handled by this chip
- * @mask_cache:		Cached mask register
+ * @mask_cache:		Cached mask register shared between all chip types
  * @type_cache:		Cached type register
  * @polarity_cache:	Cached polarity register
  * @wake_enabled:	Interrupt can wakeup from suspend
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index 0e6ba789056c..113d9ebfe0aa 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -39,7 +39,7 @@ void irq_gc_mask_disable_reg(struct irq_data *d)
 
 	irq_gc_lock(gc);
 	irq_reg_writel(mask, gc->reg_base + ct->regs.disable);
-	gc->mask_cache &= ~mask;
+	*ct->mask_cache &= ~mask;
 	irq_gc_unlock(gc);
 }
 
@@ -57,8 +57,8 @@ void irq_gc_mask_set_bit(struct irq_data *d)
 	u32 mask = 1 << (d->irq - gc->irq_base);
 
 	irq_gc_lock(gc);
-	gc->mask_cache |= mask;
-	irq_reg_writel(gc->mask_cache, gc->reg_base + ct->regs.mask);
+	*ct->mask_cache |= mask;
+	irq_reg_writel(*ct->mask_cache, gc->reg_base + ct->regs.mask);
 	irq_gc_unlock(gc);
 }
 
@@ -76,8 +76,8 @@ void irq_gc_mask_clr_bit(struct irq_data *d)
 	u32 mask = 1 << (d->irq - gc->irq_base);
 
 	irq_gc_lock(gc);
-	gc->mask_cache &= ~mask;
-	irq_reg_writel(gc->mask_cache, gc->reg_base + ct->regs.mask);
+	*ct->mask_cache &= ~mask;
+	irq_reg_writel(*ct->mask_cache, gc->reg_base + ct->regs.mask);
 	irq_gc_unlock(gc);
 }
 
@@ -96,7 +96,7 @@ void irq_gc_unmask_enable_reg(struct irq_data *d)
 
 	irq_gc_lock(gc);
 	irq_reg_writel(mask, gc->reg_base + ct->regs.enable);
-	gc->mask_cache |= mask;
+	*ct->mask_cache |= mask;
 	irq_gc_unlock(gc);
 }
 
@@ -250,6 +250,10 @@ void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
 	if (flags & IRQ_GC_INIT_MASK_CACHE)
 		gc->mask_cache = irq_reg_readl(gc->reg_base + ct->regs.mask);
 
+	/* Initialize mask cache pointer */
+	for (i = 0; i < gc->num_ct; i++)
+		ct[i].mask_cache = &gc->mask_cache;
+
 	for (i = gc->irq_base; msk; msk >>= 1, i++) {
 		if (!(msk & 0x01))
 			continue;