[ARM] 5233/1: Allow PXA to have ISA IRQs numbered 0-15

Allow PXA IRQs to be numbered starting at 16, leaving 0 to 15 for the
ISA IRQs, if needed.

This patch depends on RMK's PXA_HAVE_BOARD_IRQS patch.

Signed-off-by: Marc Zyngier <marc.zyngier@altran.com>
Acked-by: Russel King <linux@arm.linux.org.uk>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/Kconfig

@@ -353,4 +353,7 @@ config TOSA_BT
 config PXA_HAVE_BOARD_IRQS
 	bool
 
+config PXA_HAVE_ISA_IRQS
+	bool
+
 endif

arch/arm/mach-pxa/include/mach/entry-macro.S

@@ -41,7 +41,7 @@
 		and	\irqstat, \irqstat, \irqnr
 		clz	\irqnr, \irqstat
 		rsb	\irqnr, \irqnr, #31
-		add	\irqnr, \irqnr, #32
+		add	\irqnr, \irqnr, #(32 + PXA_IRQ(0))
 		b	1001f
 1003:
 		mrc	p6, 0, \irqstat, c0, c0, 0	@ ICIP
@@ -52,6 +52,6 @@
 		rsb	\irqstat, \irqnr, #0
 		and	\irqstat, \irqstat, \irqnr
 		clz	\irqnr, \irqstat
-		rsb	\irqnr, \irqnr, #31
+		rsb	\irqnr, \irqnr, #(31 + PXA_IRQ(0))
 1001:
 		.endm

arch/arm/mach-pxa/include/mach/irqs.h

@@ -11,7 +11,14 @@
  */
 
 
-#define PXA_IRQ(x)	(x)
+#ifdef CONFIG_PXA_HAVE_ISA_IRQS
+#define PXA_ISA_IRQ(x)	(x)
+#define PXA_ISA_IRQ_NUM	(16)
+#else
+#define PXA_ISA_IRQ_NUM	(0)
+#endif
+
+#define PXA_IRQ(x)	(PXA_ISA_IRQ_NUM + (x))
 
 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
 #define IRQ_SSP3	PXA_IRQ(0)	/* SSP3 service request */
@@ -73,7 +80,7 @@
 #define IRQ_MMC3	PXA_IRQ(55)	/* MMC3 Controller (PXA310) */
 #endif
 
-#define PXA_GPIO_IRQ_BASE	(64)
+#define PXA_GPIO_IRQ_BASE	PXA_IRQ(64)
 #define PXA_GPIO_IRQ_NUM	(128)
 
 #define GPIO_2_x_TO_IRQ(x)	(PXA_GPIO_IRQ_BASE + (x))

arch/arm/mach-pxa/irq.c

@@ -57,7 +57,7 @@ void __init pxa_init_irq(int irq_nr, set_wake_t fn)
 
 	pxa_internal_irq_nr = irq_nr;
 
-	for (irq = 0; irq < irq_nr; irq += 32) {
+	for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq += 32) {
 		_ICMR(irq) = 0;	/* disable all IRQs */
 		_ICLR(irq) = 0;	/* all IRQs are IRQ, not FIQ */
 	}