omap3: Runtime detection of Si features

The OMAP35x family has multiple variants differing
in the HW features. This patch detects these features
at runtime and prints information during the boot.

Since most of the code seemed repetitive, macros
have been used for readability.

Signed-off-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

3 files changed, 108 insertions, 3 deletions

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index d28e6fec7e4..d7ac8d54714 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -28,6 +28,7 @@
 static struct omap_chip_id omap_chip;
 static unsigned int omap_revision;
 
+u32 omap3_features;
 
 unsigned int omap_rev(void)
 {
@@ -155,7 +156,33 @@ void __init omap24xx_check_revision(void)
 	pr_info("\n");
 }
 
-void __init omap34xx_check_revision(void)
+#define OMAP3_CHECK_FEATURE(status,feat)				\
+	if (((status & OMAP3_ ##feat## _MASK) 				\
+		>> OMAP3_ ##feat## _SHIFT) != FEAT_ ##feat## _NONE) { 	\
+		omap3_features |= OMAP3_HAS_ ##feat;			\
+	}
+
+void __init omap3_check_features(void)
+{
+	u32 status;
+
+	omap3_features = 0;
+
+	status = omap_ctrl_readl(OMAP3_CONTROL_OMAP_STATUS);
+
+	OMAP3_CHECK_FEATURE(status, L2CACHE);
+	OMAP3_CHECK_FEATURE(status, IVA);
+	OMAP3_CHECK_FEATURE(status, SGX);
+	OMAP3_CHECK_FEATURE(status, NEON);
+	OMAP3_CHECK_FEATURE(status, ISP);
+
+	/*
+	 * TODO: Get additional info (where applicable)
+	 *       e.g. Size of L2 cache.
+	 */
+}
+
+void __init omap3_check_revision(void)
 {
 	u32 cpuid, idcode;
 	u16 hawkeye;
@@ -212,6 +239,22 @@ out:
 	pr_info("OMAP%04x %s\n", omap_rev() >> 16, rev_name);
 }
 
+#define OMAP3_SHOW_FEATURE(feat)		\
+	if (omap3_has_ ##feat()) {		\
+		pr_info (" - "#feat" : Y");	\
+	} else {				\
+		pr_info (" - "#feat" : N");	\
+	}
+
+void __init omap3_cpuinfo(void)
+{
+	OMAP3_SHOW_FEATURE(l2cache);
+	OMAP3_SHOW_FEATURE(iva);
+	OMAP3_SHOW_FEATURE(sgx);
+	OMAP3_SHOW_FEATURE(neon);
+	OMAP3_SHOW_FEATURE(isp);
+}
+
 /*
  * Try to detect the exact revision of the omap we're running on
  */
@@ -223,8 +266,11 @@ void __init omap2_check_revision(void)
 	 */
 	if (cpu_is_omap24xx())
 		omap24xx_check_revision();
-	else if (cpu_is_omap34xx())
-		omap34xx_check_revision();
+	else if (cpu_is_omap34xx()) {
+		omap3_check_features();
+		omap3_check_revision();
+		omap3_cpuinfo();
+	}
 	else if (cpu_is_omap44xx()) {
 		printk(KERN_INFO "FIXME: CPU revision = OMAP4430\n");
 		return;
diff --git a/arch/arm/plat-omap/include/plat/control.h b/arch/arm/plat-omap/include/plat/control.h
index 8237cb9e74f..79985e497c4 100644
--- a/arch/arm/plat-omap/include/plat/control.h
+++ b/arch/arm/plat-omap/include/plat/control.h
@@ -254,6 +254,40 @@
 #define OMAP343X_SCRATCHPAD		(OMAP343X_CTRL_BASE + 0x910)
 #define OMAP343X_SCRATCHPAD_ROM_OFFSET	0x19C
 
+/*
+ * CONTROL OMAP STATUS register to identify OMAP3 features
+ */
+#define OMAP3_CONTROL_OMAP_STATUS	0x044c
+
+#define OMAP3_SGX_SHIFT			13
+#define OMAP3_SGX_MASK			(3 << OMAP3_SGX_SHIFT)
+#define		FEAT_SGX_FULL		0
+#define		FEAT_SGX_HALF		1
+#define		FEAT_SGX_NONE		2
+
+#define OMAP3_IVA_SHIFT			12
+#define OMAP3_IVA_MASK			(1 << OMAP3_SGX_SHIFT)
+#define		FEAT_IVA		0
+#define		FEAT_IVA_NONE		1
+
+#define OMAP3_L2CACHE_SHIFT		10
+#define OMAP3_L2CACHE_MASK		(3 << OMAP3_L2CACHE_SHIFT)
+#define		FEAT_L2CACHE_NONE	0
+#define		FEAT_L2CACHE_64KB	1
+#define		FEAT_L2CACHE_128KB	2
+#define		FEAT_L2CACHE_256KB	3
+
+#define OMAP3_ISP_SHIFT			5
+#define OMAP3_ISP_MASK			(1<< OMAP3_ISP_SHIFT)
+#define		FEAT_ISP		0
+#define		FEAT_ISP_NONE		1
+
+#define OMAP3_NEON_SHIFT		4
+#define OMAP3_NEON_MASK			(1<< OMAP3_NEON_SHIFT)
+#define		FEAT_NEON		0
+#define		FEAT_NEON_NONE		1
+
+
 #ifndef __ASSEMBLY__
 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) || \
 		defined(CONFIG_ARCH_OMAP4)
diff --git a/arch/arm/plat-omap/include/plat/cpu.h b/arch/arm/plat-omap/include/plat/cpu.h
index f129efb3075..431fec45bbb 100644
--- a/arch/arm/plat-omap/include/plat/cpu.h
+++ b/arch/arm/plat-omap/include/plat/cpu.h
@@ -30,6 +30,8 @@
 #ifndef __ASM_ARCH_OMAP_CPU_H
 #define __ASM_ARCH_OMAP_CPU_H
 
+#include <linux/bitops.h>
+
 /*
  * Omap device type i.e. EMU/HS/TST/GP/BAD
  */
@@ -423,4 +425,27 @@ IS_OMAP_TYPE(3430, 0x3430)
 int omap_chip_is(struct omap_chip_id oci);
 void omap2_check_revision(void);
 
+/*
+ * Runtime detection of OMAP3 features
+ */
+extern u32 omap3_features;
+
+#define OMAP3_HAS_L2CACHE		BIT(0)
+#define OMAP3_HAS_IVA			BIT(1)
+#define OMAP3_HAS_SGX			BIT(2)
+#define OMAP3_HAS_NEON			BIT(3)
+#define OMAP3_HAS_ISP			BIT(4)
+
+#define OMAP3_HAS_FEATURE(feat,flag)			\
+static inline unsigned int omap3_has_ ##feat(void)	\
+{							\
+	return (omap3_features & OMAP3_HAS_ ##flag);	\
+}							\
+
+OMAP3_HAS_FEATURE(l2cache, L2CACHE)
+OMAP3_HAS_FEATURE(sgx, SGX)
+OMAP3_HAS_FEATURE(iva, IVA)
+OMAP3_HAS_FEATURE(neon, NEON)
+OMAP3_HAS_FEATURE(isp, ISP)
+
 #endif