ARM: DRA7: id: Add cpu detection support for DRA7xx based SoCs'

The DRA7xx is a high-performance, infotainment application device,
based on enhanced OMAP architecture integrated on a 28-nm technology.

Since DRA7 is a platform supported only using DT, the cpu detection
is based on the compatibles passed from DT blobs as suggested here
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/187712.html

Suggested-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: R Sricharan <r.sricharan@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>

arch/arm/mach-omap1/include/mach/soc.h

@@ -195,6 +195,7 @@ IS_OMAP_TYPE(1710, 0x1710)
 #define cpu_is_omap34xx()		0
 #define cpu_is_omap44xx()		0
 #define soc_is_omap54xx()		0
+#define soc_is_dra7xx()			0
 #define soc_is_am33xx()			0
 #define cpu_class_is_omap1()		1
 #define cpu_class_is_omap2()		0

arch/arm/mach-omap2/id.c

@@ -61,7 +61,7 @@ int omap_type(void)
 		val = omap_ctrl_readl(OMAP343X_CONTROL_STATUS);
 	} else if (cpu_is_omap44xx()) {
 		val = omap_ctrl_readl(OMAP4_CTRL_MODULE_CORE_STATUS);
-	} else if (soc_is_omap54xx()) {
+	} else if (soc_is_omap54xx() || soc_is_dra7xx()) {
 		val = omap_ctrl_readl(OMAP5XXX_CONTROL_STATUS);
 		val &= OMAP5_DEVICETYPE_MASK;
 		val >>= 6;
@@ -116,7 +116,7 @@ static u16 tap_prod_id;
 
 void omap_get_die_id(struct omap_die_id *odi)
 {
-	if (cpu_is_omap44xx() || soc_is_omap54xx()) {
+	if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
 		odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_0);
 		odi->id_1 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_1);
 		odi->id_2 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_2);

arch/arm/mach-omap2/soc.h

@@ -8,6 +8,7 @@
  * Written by Tony Lindgren <tony.lindgren@nokia.com>
  *
  * Added OMAP4/5 specific defines - Santosh Shilimkar<santosh.shilimkar@ti.com>
+ * Added DRA7xxx specific defines - Sricharan R<r.sricharan@ti.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -35,6 +36,7 @@
 #ifndef __ASSEMBLY__
 
 #include <linux/bitops.h>
+#include <linux/of.h>
 
 /*
  * Test if multicore OMAP support is needed
@@ -105,6 +107,15 @@
 # endif
 #endif
 
+#ifdef CONFIG_SOC_DRA7XX
+# ifdef OMAP_NAME
+#  undef MULTI_OMAP2
+#  define MULTI_OMAP2
+# else
+#  define OMAP_NAME DRA7XX
+# endif
+#endif
+
 /*
  * Omap device type i.e. EMU/HS/TST/GP/BAD
  */
@@ -233,6 +244,7 @@ IS_AM_SUBCLASS(437x, 0x437)
 #define cpu_is_omap447x()		0
 #define soc_is_omap54xx()		0
 #define soc_is_omap543x()		0
+#define soc_is_dra7xx()			0
 
 #if defined(MULTI_OMAP2)
 # if defined(CONFIG_ARCH_OMAP2)
@@ -379,6 +391,11 @@ IS_OMAP_TYPE(3430, 0x3430)
 # define soc_is_omap543x()		is_omap543x()
 #endif
 
+#if defined(CONFIG_SOC_DRA7XX)
+#undef soc_is_dra7xx
+#define soc_is_dra7xx()	(of_machine_is_compatible("ti,dra7"))
+#endif
+
 /* Various silicon revisions for omap2 */
 #define OMAP242X_CLASS		0x24200024
 #define OMAP2420_REV_ES1_0	OMAP242X_CLASS