[ARM] 4109/2: Add support for the RealView/EB MPCore revC platform

The kernel originally supported revB only. This patch enables revC by
default and adds a config option for building the kernel for the revB
platform. Since the SCU base address was hard-coded in the proc-v6.S
file (and only valid for RealView/EB revB), this patch also adds a
more generic support for defining the SCU information.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-realview/Kconfig

@@ -16,4 +16,14 @@ config REALVIEW_MPCORE
 	  kernel built with this option enabled is not compatible with
 	  other tiles.
 
+config REALVIEW_MPCORE_REVB
+	bool "Support MPcore RevB tile"
+	depends on REALVIEW_MPCORE
+	default n
+	help
+	  Enable support for the MPCore RevB tile on the Realview platform.
+	  Since there are device address differences, a
+	  kernel built with this option enabled is not compatible with
+	  other tiles.
+
 endmenu

arch/arm/mach-realview/realview_eb.c

@@ -152,9 +152,9 @@ static void __init gic_init_irq(void)
 #ifdef CONFIG_REALVIEW_MPCORE
 	unsigned int pldctrl;
 	writel(0x0000a05f, __io_address(REALVIEW_SYS_LOCK));
-	pldctrl = readl(__io_address(REALVIEW_SYS_BASE)	+ 0xd8);
+	pldctrl = readl(__io_address(REALVIEW_SYS_BASE)	+ REALVIEW_MPCORE_SYS_PLD_CTRL1);
 	pldctrl |= 0x00800000;	/* New irq mode */
-	writel(pldctrl, __io_address(REALVIEW_SYS_BASE) + 0xd8);
+	writel(pldctrl, __io_address(REALVIEW_SYS_BASE) + REALVIEW_MPCORE_SYS_PLD_CTRL1);
 	writel(0x00000000, __io_address(REALVIEW_SYS_LOCK));
 #endif
 	gic_dist_init(0, __io_address(REALVIEW_GIC_DIST_BASE), 29);

arch/arm/mm/proc-v6.S

@@ -14,10 +14,13 @@
 #include <asm/assembler.h>
 #include <asm/asm-offsets.h>
 #include <asm/elf.h>
-#include <asm/hardware/arm_scu.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/pgtable.h>
 
+#ifdef CONFIG_SMP
+#include <asm/hardware/arm_scu.h>
+#endif
+
 #include "proc-macros.S"
 
 #define D_CACHE_LINE_SIZE	32
@@ -183,8 +186,7 @@ __v6_setup:
 	/* Set up the SCU on core 0 only */
 	mrc	p15, 0, r0, c0, c0, 5		@ CPU core number
 	ands	r0, r0, #15
-	moveq	r0, #0x10000000 @ SCU_BASE
-	orreq	r0, r0, #0x00100000
+	ldreq	r0, =SCU_BASE
 	ldreq	r5, [r0, #SCU_CTRL]
 	orreq	r5, r5, #1
 	streq	r5, [r0, #SCU_CTRL]

include/asm-arm/arch-realview/hardware.h

@@ -26,7 +26,7 @@
 #include <asm/arch/platform.h>
 
 /* macro to get at IO space when running virtually */
-#define IO_ADDRESS(x)		(((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000)
+#define IO_ADDRESS(x)		((((x) & 0x0effffff) | (((x) >> 4) & 0x0f000000)) + 0xf0000000)
 #define __io_address(n)		__io(IO_ADDRESS(n))
 
 #endif

include/asm-arm/arch-realview/platform.h

@@ -207,11 +207,21 @@
 #define REALVIEW_GIC_CPU_BASE         0x10040000	/* Generic interrupt controller CPU interface */
 #define REALVIEW_GIC_DIST_BASE        0x10041000	/* Generic interrupt controller distributor */
 #else
+#ifdef CONFIG_REALVIEW_MPCORE_REVB
 #define REALVIEW_MPCORE_SCU_BASE	0x10100000	/*  SCU registers */
 #define REALVIEW_GIC_CPU_BASE		0x10100100	/* Generic interrupt controller CPU interface */
 #define REALVIEW_TWD_BASE		0x10100700
 #define REALVIEW_TWD_SIZE		0x00000100
 #define REALVIEW_GIC_DIST_BASE		0x10101000	/* Generic interrupt controller distributor */
+#define REALVIEW_MPCORE_SYS_PLD_CTRL1 0xD8		/*  Register offset for MPCore sysctl */
+#else
+#define REALVIEW_MPCORE_SCU_BASE      0x1F000000	/*  SCU registers */
+#define REALVIEW_GIC_CPU_BASE         0x1F000100	/* Generic interrupt controller CPU interface */
+#define REALVIEW_TWD_BASE             0x1F000700
+#define REALVIEW_TWD_SIZE             0x00000100
+#define REALVIEW_GIC_DIST_BASE        0x1F001000	/* Generic interrupt controller distributor */
+#define REALVIEW_MPCORE_SYS_PLD_CTRL1 0x74		/*  Register offset for MPCore sysctl */
+#endif
 #define REALVIEW_GIC1_CPU_BASE        0x10040000	/* Generic interrupt controller CPU interface */
 #define REALVIEW_GIC1_DIST_BASE       0x10041000	/* Generic interrupt controller distributor */
 #endif

include/asm-arm/arch-realview/scu.h

@@ -0,0 +1,8 @@
+#ifndef __ASMARM_ARCH_SCU_H
+#define __ASMARM_ARCH_SCU_H
+
+#include <asm/arch/platform.h>
+
+#define SCU_BASE	REALVIEW_MPCORE_SCU_BASE
+
+#endif

include/asm-arm/hardware/arm_scu.h

@@ -1,6 +1,8 @@
 #ifndef ASMARM_HARDWARE_ARM_SCU_H
 #define ASMARM_HARDWARE_ARM_SCU_H
 
+#include <asm/arch/scu.h>
+
 /*
  * SCU registers
  */