Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / arm / mach-shmobile / entry-intc.S

diff --git a/arch/arm/mach-shmobile/entry-intc.S b/arch/arm/mach-shmobile/entry-intc.S
new file mode 100644 (file)
index 0000000..cac0a7a
--- /dev/null
+++ b/arch/arm/mach-shmobile/entry-intc.S
@@ -0,0 +1,57 @@
+/*
+ * ARM Interrupt demux handler using INTC
+ *
+ * Copyright (C) 2010 Magnus Damm
+ * Copyright (C) 2008 Renesas Solutions Corp.
+ *
+ * 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 <asm/entry-macro-multi.S>
+
+#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  get_irqnr_preamble, base, tmp
+       ldr     \base, =INTCA_BASE
+       .endm
+
+       .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
+       /* 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
+
+       /* Convert vector to irq number, same as the evt2irq() macro */
+       lsr     \irqnr, \irqnr, #0x5
+       subs    \irqnr, \irqnr, #16
+
+1000:
+       .endm
+
+       .macro  test_for_ipi, irqnr, irqstat, base, tmp
+       .endm
+
+       .macro  test_for_ltirq, irqnr, irqstat, base, tmp
+       .endm
+
+       arch_irq_handler shmobile_handle_irq_intc