ARM: OMAP4: Add minimal support for omap4

This patch adds the support for OMAP4. The platform and machine specific
headers and sources updated for OMAP4430 SDP platform.

OMAP4430 is Texas Instrument's SOC based on ARM Cortex-A9 SMP architecture.
It's a dual core SOC with GIC used for interrupt handling and SCU for cache
coherency.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 44 insertions, 2 deletions

diff --git a/arch/arm/plat-omap/include/mach/entry-macro.S b/arch/arm/plat-omap/include/mach/entry-macro.S
index 33256a0e9a28..00f45c01390d 100644
--- a/arch/arm/plat-omap/include/mach/entry-macro.S
+++ b/arch/arm/plat-omap/include/mach/entry-macro.S
@@ -3,6 +3,9 @@
  *
  * Low-level IRQ helper macros for OMAP-based platforms
  *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.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.
@@ -10,6 +13,7 @@
 #include <mach/hardware.h>
 #include <mach/io.h>
 #include <mach/irqs.h>
+#include <asm/hardware/gic.h>
 
 #if defined(CONFIG_ARCH_OMAP1)
 
@@ -56,7 +60,8 @@
 		.endm
 
 #endif
-#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
+#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX) || \
+			defined(CONFIG_ARCH_OMAP4)
 
 #include <mach/omap24xx.h>
 #include <mach/omap34xx.h>
@@ -67,7 +72,9 @@
 #elif defined(CONFIG_ARCH_OMAP34XX)
 #define OMAP2_VA_IC_BASE		IO_ADDRESS(OMAP34XX_IC_BASE)
 #endif
-
+#if defined(CONFIG_ARCH_OMAP4)
+#include <mach/omap44xx.h>
+#endif
 #define INTCPS_SIR_IRQ_OFFSET	0x0040		/* Active interrupt offset */
 #define	ACTIVEIRQ_MASK		0x7f		/* Active interrupt bits */
 
@@ -80,6 +87,7 @@
 		.macro  arch_ret_to_user, tmp1, tmp2
 		.endm
 
+#ifndef CONFIG_ARCH_OMAP4
 		.macro	get_irqnr_and_base, irqnr, irqstat, base, tmp
 		ldr	\base, =OMAP2_VA_IC_BASE
 		ldr	\irqnr, [\base, #0x98] /* IRQ pending reg 1 */
@@ -95,6 +103,40 @@
 		and	\irqnr, \irqnr, #ACTIVEIRQ_MASK /* Clear spurious bits */
 
 		.endm
+#else
+		/*
+		 * The interrupt numbering scheme is defined in the
+		 * interrupt controller spec.  To wit:
+		 *
+		 * Interrupts 0-15 are IPI
+		 * 16-28 are reserved
+		 * 29-31 are local.  We allow 30 to be used for the watchdog.
+		 * 32-1020 are global
+		 * 1021-1022 are reserved
+		 * 1023 is "spurious" (no interrupt)
+		 *
+		 * For now, we ignore all local interrupts so only return an
+		 * interrupt if it's between 30 and 1020.  The test_for_ipi
+		 * routine below will pick up on IPIs.
+		 * A simple read from the controller will tell us the number
+		 * of the highest priority enabled interrupt.
+		 * We then just need to check whether it is in the
+		 * valid range for an IRQ (30-1020 inclusive).
+		 */
+		.macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
+		ldr     \base, =OMAP44XX_VA_GIC_CPU_BASE
+		ldr     \irqstat, [\base, #GIC_CPU_INTACK]
+
+		ldr     \tmp, =1021
+
+		bic     \irqnr, \irqstat, #0x1c00
+
+		cmp     \irqnr, #29
+		cmpcc   \irqnr, \irqnr
+		cmpne   \irqnr, \tmp
+		cmpcs   \irqnr, \irqnr
+		.endm
+#endif
 
 		.macro	irq_prio_table
 		.endm