ARM: 6010/1: ST SPEAr: Added basic header files for SPEAr3xx machine family

Reviewed-by: Linus Walleij <linux.walleij@stericsson.com>

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 46 insertions, 0 deletions

diff --git a/arch/arm/mach-spear3xx/include/mach/entry-macro.S b/arch/arm/mach-spear3xx/include/mach/entry-macro.S
new file mode 100644
index 000000000000..947625d6b48d
--- /dev/null
+++ b/arch/arm/mach-spear3xx/include/mach/entry-macro.S
@@ -0,0 +1,46 @@
+/*
+ * arch/arm/mach-spear3xx/include/mach/entry-macro.S
+ *
+ * Low-level IRQ helper macros for SPEAr3xx machine family
+ *
+ * Copyright (C) 2009 ST Microelectronics
+ * Viresh Kumar<viresh.kumar@st.com>
+ *
+ * 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>
+#include <mach/spear.h>
+#include <asm/hardware/vic.h>
+
+                .macro  disable_fiq
+                .endm
+
+                .macro  get_irqnr_preamble, base, tmp
+                .endm
+
+                .macro  arch_ret_to_user, tmp1, tmp2
+                .endm
+
+                .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
+                ldr     \base, =VA_SPEAR3XX_ML1_VIC_BASE
+                ldr     \irqstat, [\base, #VIC_IRQ_STATUS]      @ get status
+                teq     \irqstat, #0
+                beq     1001f                           @ this will set/reset
+                                                        @ zero register
+                /*
+                 * Following code will find bit position of least significang
+                 * bit set in irqstat, using following equation
+                 * least significant bit set in n = (n & ~(n-1))
+                 */
+                sub     \tmp, \irqstat, #1              @ tmp = irqstat - 1
+                mvn     \tmp, \tmp                      @ tmp = ~tmp
+                and     \irqstat, \irqstat, \tmp        @ irqstat &= tmp
+                /* Now, irqstat is = bit no. of 1st bit set in vic irq status */
+                clz     \tmp, \irqstat                  @ tmp = leading zeros
+                rsb     \irqnr, \tmp, #0x1F             @ irqnr = 32 - tmp - 1
+
+1001:           /* EQ will be set if no irqs pending */
+                .endm