ARM: DRA752: add detection of SoC information

Currently the files in /sys/devices/soc0/ show no information about
DRA7. Few userspace programs do depend on this information to make SoC
specific support. So update logic to detect the relevant information and
provide to userspace.
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/id.c

@@ -628,6 +628,41 @@ void __init omap5xxx_check_revision(void)
 	pr_info("%s %s\n", soc_name, soc_rev);
 }
 
+void __init dra7xxx_check_revision(void)
+{
+	u32 idcode;
+	u16 hawkeye;
+	u8 rev;
+
+	idcode = read_tap_reg(OMAP_TAP_IDCODE);
+	hawkeye = (idcode >> 12) & 0xffff;
+	rev = (idcode >> 28) & 0xff;
+	switch (hawkeye) {
+	case 0xb990:
+		switch (rev) {
+		case 0:
+			omap_revision = DRA752_REV_ES1_0;
+			break;
+		case 1:
+		default:
+			omap_revision = DRA752_REV_ES1_1;
+		}
+		break;
+
+	default:
+		/* Unknown default to latest silicon rev as default*/
+		pr_warn("%s: unknown idcode=0x%08x (hawkeye=0x%08x,rev=0x%d)\n",
+			__func__, idcode, hawkeye, rev);
+		omap_revision = DRA752_REV_ES1_1;
+	}
+
+	sprintf(soc_name, "DRA%03x", omap_rev() >> 16);
+	sprintf(soc_rev, "ES%d.%d", (omap_rev() >> 12) & 0xf,
+		(omap_rev() >> 8) & 0xf);
+
+	pr_info("%s %s\n", soc_name, soc_rev);
+}
+
 /*
  * Set up things for map_io and processor detection later on. Gets called
  * pretty much first thing from board init. For multi-omap, this gets
@@ -669,6 +704,8 @@ static const char * __init omap_get_family(void)
 		return kasprintf(GFP_KERNEL, "OMAP5");
 	else if (soc_is_am43xx())
 		return kasprintf(GFP_KERNEL, "AM43xx");
+	else if (soc_is_dra7xx())
+		return kasprintf(GFP_KERNEL, "DRA7");
 	else
 		return kasprintf(GFP_KERNEL, "Unknown");
 }

arch/arm/mach-omap2/io.c

@@ -693,6 +693,7 @@ void __init dra7xx_init_early(void)
 	omap_prm_base_init();
 	omap_cm_base_init();
 	omap44xx_prm_init();
+	dra7xxx_check_revision();
 	dra7xx_powerdomains_init();
 	dra7xx_clockdomains_init();
 	dra7xx_hwmod_init();

arch/arm/mach-omap2/soc.h

@@ -459,10 +459,15 @@ IS_OMAP_TYPE(3430, 0x3430)
 #define OMAP5430_REV_ES2_0	(OMAP54XX_CLASS | (0x30 << 16) | (0x20 << 8))
 #define OMAP5432_REV_ES2_0	(OMAP54XX_CLASS | (0x32 << 16) | (0x20 << 8))
 
+#define DRA7XX_CLASS		0x07000000
+#define DRA752_REV_ES1_0	(DRA7XX_CLASS | (0x52 << 16) | (0x10 << 8))
+#define DRA752_REV_ES1_1	(DRA7XX_CLASS | (0x52 << 16) | (0x11 << 8))
+
 void omap2xxx_check_revision(void);
 void omap3xxx_check_revision(void);
 void omap4xxx_check_revision(void);
 void omap5xxx_check_revision(void);
+void dra7xxx_check_revision(void);
 void omap3xxx_check_features(void);
 void ti81xx_check_features(void);
 void am33xx_check_features(void);