bcm2836 SoC support (used in Raspberry Pi 2 model B)

The bcm2835 and bcm2836 are essentially identical, except:
- The CPU is an ARM1176 v.s. a quad-core Cortex-A7.
- The physical address of many IO controllers has moved.

Rather than introducing a whole new bcm2836 value for $(SOC) or $(ARCH),
update the existing bcm2835 code to handle the minor differences, and
plumb it into the ARMv7 CPU architecture.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

arch/arm/cpu/armv7/Makefile

@@ -39,6 +39,7 @@ endif
 
 obj-$(if $(filter am33xx,$(SOC)),y) += am33xx/
 obj-$(if $(filter armada-xp,$(SOC)),y) += armada-xp/
+obj-$(CONFIG_BCM2835) += bcm2835/
 obj-$(if $(filter bcm281xx,$(SOC)),y) += bcm281xx/
 obj-$(if $(filter bcmcygnus,$(SOC)),y) += bcmcygnus/
 obj-$(if $(filter bcmnsp,$(SOC)),y) += bcmnsp/

arch/arm/cpu/armv7/bcm2835/Makefile

@@ -0,0 +1,13 @@
+#
+# (C) Copyright 2012 Stephen Warren
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+src_dir := ../../arm1176/bcm2835/
+
+obj-y	:=
+obj-y	+= $(src_dir)/init.o
+obj-y	+= $(src_dir)/reset.o
+obj-y	+= $(src_dir)/timer.o
+obj-y	+= $(src_dir)/mbox.o

arch/arm/include/asm/arch-bcm2835/gpio.h

@@ -1,6 +1,7 @@
 /*
  * Copyright (C) 2012 Vikram Narayananan
  * <vikram186@gmail.com>
+ * (C) Copyright 2012,2015 Stephen Warren
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
@@ -8,7 +9,11 @@
 #ifndef _BCM2835_GPIO_H_
 #define _BCM2835_GPIO_H_
 
+#ifdef CONFIG_BCM2836
+#define BCM2835_GPIO_BASE		0x3f200000
+#else
 #define BCM2835_GPIO_BASE		0x20200000
+#endif
 #define BCM2835_GPIO_COUNT		54
 
 #define BCM2835_GPIO_FSEL_MASK		0x7

arch/arm/include/asm/arch-bcm2835/mbox.h

@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2012 Stephen Warren
+ * (C) Copyright 2012,2015 Stephen Warren
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
@@ -38,7 +38,11 @@
 
 /* Raw mailbox HW */
 
+#ifdef CONFIG_BCM2836
+#define BCM2835_MBOX_PHYSADDR	0x3f00b880
+#else
 #define BCM2835_MBOX_PHYSADDR	0x2000b880
+#endif
 
 struct bcm2835_mbox_regs {
 	u32 read;

arch/arm/include/asm/arch-bcm2835/sdhci.h

@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2012 Stephen Warren
+ * (C) Copyright 2012,2015 Stephen Warren
  *
  * SPDX-License-Identifier:	GPL-2.0
  */
@@ -7,7 +7,11 @@
 #ifndef _BCM2835_SDHCI_H_
 #define _BCM2835_SDHCI_H_
 
+#ifdef CONFIG_BCM2836
+#define BCM2835_SDHCI_BASE 0x3f300000
+#else
 #define BCM2835_SDHCI_BASE 0x20300000
+#endif
 
 int bcm2835_sdhci_init(u32 regbase, u32 emmc_freq);
 

arch/arm/include/asm/arch-bcm2835/timer.h

@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2012 Stephen Warren
+ * (C) Copyright 2012,2015 Stephen Warren
  *
  * SPDX-License-Identifier:	GPL-2.0
  */
@@ -7,7 +7,11 @@
 #ifndef _BCM2835_TIMER_H
 #define _BCM2835_TIMER_H
 
+#ifdef CONFIG_BCM2836
+#define BCM2835_TIMER_PHYSADDR	0x3f003000
+#else
 #define BCM2835_TIMER_PHYSADDR	0x20003000
+#endif
 
 struct bcm2835_timer_regs {
 	u32 cs;

arch/arm/include/asm/arch-bcm2835/wdog.h

@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2012 Stephen Warren
+ * (C) Copyright 2012,2015 Stephen Warren
  *
  * SPDX-License-Identifier:	GPL-2.0
  */
@@ -7,7 +7,11 @@
 #ifndef _BCM2835_TIMER_H
 #define _BCM2835_TIMER_H
 
+#ifdef CONFIG_BCM2836
+#define BCM2835_WDOG_PHYSADDR			0x3f100000
+#else
 #define BCM2835_WDOG_PHYSADDR			0x20100000
+#endif
 
 struct bcm2835_wdog_regs {
 	u32 unknown0[7];