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-rw-r--r--arch/arm/mach-shmobile/include/mach/entry-macro.S30
1 files changed, 26 insertions, 4 deletions
diff --git a/arch/arm/mach-shmobile/include/mach/entry-macro.S b/arch/arm/mach-shmobile/include/mach/entry-macro.S
index a285d13..f428c4d 100644
--- a/arch/arm/mach-shmobile/include/mach/entry-macro.S
+++ b/arch/arm/mach-shmobile/include/mach/entry-macro.S
@@ -1,4 +1,5 @@
/*
+ * Copyright (C) 2010 Magnus Damm
* Copyright (C) 2008 Renesas Solutions Corp.
*
* This program is free software; you can redistribute it and/or modify
@@ -14,24 +15,45 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include <mach/hardware.h>
#include <mach/irqs.h>
+#define INTCA_BASE 0xe6980000
+#define INTFLGA_OFFS 0x00000018 /* accept pending interrupt */
+#define INTEVTA_OFFS 0x00000020 /* vector number of accepted interrupt */
+#define INTLVLA_OFFS 0x00000030 /* priority level of accepted interrupt */
+#define INTLVLB_OFFS 0x00000034 /* previous priority level */
+
.macro disable_fiq
.endm
.macro get_irqnr_preamble, base, tmp
- ldr \base, =INTFLGA
+ ldr \base, =INTCA_BASE
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
- ldr \irqnr, [\base]
+ /* The single INTFLGA read access below results in the following:
+ *
+ * 1. INTLVLB is updated with old priority value from INTLVLA
+ * 2. Highest priority interrupt is accepted
+ * 3. INTLVLA is updated to contain priority of accepted interrupt
+ * 4. Accepted interrupt vector is stored in INTFLGA and INTEVTA
+ */
+ ldr \irqnr, [\base, #INTFLGA_OFFS]
+
+ /* Restore INTLVLA with the value saved in INTLVLB.
+ * This is required to support interrupt priorities properly.
+ */
+ ldrb \tmp, [\base, #INTLVLB_OFFS]
+ strb \tmp, [\base, #INTLVLA_OFFS]
+
+ /* Handle invalid vector number case */
cmp \irqnr, #0
beq 1000f
- /* intevt to irq number */
+
+ /* Convert vector to irq number, same as the evt2irq() macro */
lsr \irqnr, \irqnr, #0x5
subs \irqnr, \irqnr, #16
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