ARM: clps711x: Implement usage "MULTI_IRQ_HANDLER" kernel option for a platform

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/Kconfig

@@ -371,6 +371,7 @@ config ARCH_CLPS711X
 	select COMMON_CLK
 	select CPU_ARM720T
 	select GENERIC_CLOCKEVENTS
+	select MULTI_IRQ_HANDLER
 	select NEED_MACH_MEMORY_H
 	select SPARSE_IRQ
 	help

arch/arm/mach-clps711x/autcpu12.c

@@ -75,6 +75,7 @@ MACHINE_START(AUTCPU12, "autronix autcpu12")
 	.init_irq	= clps711x_init_irq,
 	.timer		= &clps711x_timer,
 	.init_machine	= autcpu12_init,
+	.handle_irq	= clps711x_handle_irq,
 	.restart	= clps711x_restart,
 MACHINE_END
 

arch/arm/mach-clps711x/cdb89712.c

@@ -142,5 +142,6 @@ MACHINE_START(CDB89712, "Cirrus-CDB89712")
 	.init_irq	= clps711x_init_irq,
 	.timer		= &clps711x_timer,
 	.init_machine	= cdb89712_init,
+	.handle_irq	= clps711x_handle_irq,
 	.restart	= clps711x_restart,
 MACHINE_END

arch/arm/mach-clps711x/clep7312.c

@@ -33,7 +33,6 @@ fixup_clep7312(struct tag *tags, char **cmdline, struct meminfo *mi)
 	mi->bank[0].size = 0x01000000;
 }
 
-
 MACHINE_START(CLEP7212, "Cirrus Logic 7212/7312")
 	/* Maintainer: Nobody */
 	.atag_offset	= 0x0100,
@@ -42,6 +41,6 @@ MACHINE_START(CLEP7212, "Cirrus Logic 7212/7312")
 	.map_io		= clps711x_map_io,
 	.init_irq	= clps711x_init_irq,
 	.timer		= &clps711x_timer,
+	.handle_irq	= clps711x_handle_irq,
 	.restart	= clps711x_restart,
 MACHINE_END
-

arch/arm/mach-clps711x/common.c

@@ -29,6 +29,7 @@
 #include <linux/clockchips.h>
 #include <linux/clk-provider.h>
 
+#include <asm/exception.h>
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
 #include <asm/system_misc.h>
@@ -134,13 +135,11 @@ static struct irq_chip int2_chip = {
 	.irq_unmask	= int2_unmask,
 };
 
-struct clps711x_irqdesc {
+static struct {
 	int			nr;
 	struct irq_chip		*chip;
 	irq_flow_handler_t	handle;
-};
-
-static struct clps711x_irqdesc clps711x_irqdescs[] __initdata = {
+} clps711x_irqdescs[] __initdata = {
 	{ IRQ_CSINT,	&int1_chip,	handle_fasteoi_irq,	},
 	{ IRQ_EINT1,	&int1_chip,	handle_level_irq,	},
 	{ IRQ_EINT2,	&int1_chip,	handle_level_irq,	},
@@ -191,6 +190,44 @@ void __init clps711x_init_irq(void)
 	}
 }
 
+inline u32 fls16(u32 x)
+{
+	u32 r = 15;
+
+	if (!(x & 0xff00)) {
+		x <<= 8;
+		r -= 8;
+	}
+	if (!(x & 0xf000)) {
+		x <<= 4;
+		r -= 4;
+	}
+	if (!(x & 0xc000)) {
+		x <<= 2;
+		r -= 2;
+	}
+	if (!(x & 0x8000))
+		r--;
+
+	return r;
+}
+
+asmlinkage void __exception_irq_entry clps711x_handle_irq(struct pt_regs *regs)
+{
+	u32 irqstat;
+	void __iomem *base = CLPS711X_VIRT_BASE;
+
+	irqstat = readl_relaxed(base + INTSR1) & readl_relaxed(base + INTMR1);
+	if (irqstat) {
+		handle_IRQ(fls16(irqstat), regs);
+		return;
+	}
+
+	irqstat = readl_relaxed(base + INTSR2) & readl_relaxed(base + INTMR2);
+	if (likely(irqstat))
+		handle_IRQ(fls16(irqstat) + 16, regs);
+}
+
 static void clps711x_clockevent_set_mode(enum clock_event_mode mode,
 					 struct clock_event_device *evt)
 {

arch/arm/mach-clps711x/common.h

@@ -12,5 +12,6 @@ struct sys_timer;
 
 extern void clps711x_map_io(void);
 extern void clps711x_init_irq(void);
-extern struct sys_timer clps711x_timer;
+extern void clps711x_handle_irq(struct pt_regs *regs);
 extern void clps711x_restart(char mode, const char *cmd);
+extern struct sys_timer clps711x_timer;

arch/arm/mach-clps711x/edb7211.c

@@ -98,5 +98,6 @@ MACHINE_START(EDB7211, "CL-EDB7211 (EP7211 eval board)")
 	.init_irq	= clps711x_init_irq,
 	.timer		= &clps711x_timer,
 	.init_machine	= edb7211_init,
+	.handle_irq	= clps711x_handle_irq,
 	.restart	= clps711x_restart,
 MACHINE_END

arch/arm/mach-clps711x/fortunet.c

@@ -79,5 +79,6 @@ MACHINE_START(FORTUNET, "ARM-FortuNet")
 	.map_io		= clps711x_map_io,
 	.init_irq	= clps711x_init_irq,
 	.timer		= &clps711x_timer,
+	.handle_irq	= clps711x_handle_irq,
 	.restart	= clps711x_restart,
 MACHINE_END

arch/arm/mach-clps711x/include/mach/entry-macro.S

-/*
- * arch/arm/mach-clps711x/include/mach/entry-macro.S
- *
- * Low-level IRQ helper macros for CLPS711X-based platforms
- *
- * This file is licensed under  the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- */
-#include <mach/hardware.h>
-
-		.macro	get_irqnr_preamble, base, tmp
-		.endm
-
-#if (INTSR2 - INTSR1) != (INTMR2 - INTMR1)
-#error INTSR stride != INTMR stride
-#endif
-
-		.macro	get_irqnr_and_base, irqnr, stat, base, mask
-		mov	\base, #CLPS711X_VIRT_BASE
-		ldr	\stat, [\base, #INTSR1]
-		ldr	\mask, [\base, #INTMR1]
-		mov	\irqnr, #4
-		mov	\mask, \mask, lsl #16
-		and	\stat, \stat, \mask, lsr #16
-		movs	\stat, \stat, lsr #4
-		bne	1001f
-
-		add	\base, \base, #INTSR2 - INTSR1
-		ldr	\stat, [\base, #INTSR1]
-		ldr	\mask, [\base, #INTMR1]
-		mov	\irqnr, #16
-		mov	\mask, \mask, lsl #16
-		and	\stat, \stat, \mask, lsr #16
-
-1001:		tst	\stat, #255
-		addeq	\irqnr, \irqnr, #8
-		moveq	\stat, \stat, lsr #8
-		tst	\stat, #15
-		addeq	\irqnr, \irqnr, #4
-		moveq	\stat, \stat, lsr #4
-		tst	\stat, #3
-		addeq	\irqnr, \irqnr, #2
-		moveq	\stat, \stat, lsr #2
-		tst	\stat, #1
-		addeq	\irqnr, \irqnr, #1
-		moveq	\stat, \stat, lsr #1
-		tst	\stat, #1			@ bit 0 should be set
-		.endm
-
-

arch/arm/mach-clps711x/p720t.c

@@ -142,5 +142,6 @@ MACHINE_START(P720T, "ARM-Prospector720T")
 	.timer		= &clps711x_timer,
 	.init_machine	= p720t_init,
 	.init_late	= p720t_init_late,
+	.handle_irq	= clps711x_handle_irq,
 	.restart	= clps711x_restart,
 MACHINE_END