1 files changed, 72 insertions, 0 deletions
diff --git a/arch/arm/include/asm/ti-common/sys_proto.h b/arch/arm/include/asm/ti-common/sys_proto.h
new file mode 100644
index 0000000000..d3ab75fa32
--- /dev/null
+++ b/arch/arm/include/asm/ti-common/sys_proto.h
@@ -0,0 +1,72 @@
+/*
+ * (C) Copyright 2014
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#ifndef _TI_COMMON_SYS_PROTO_H_
+#define _TI_COMMON_SYS_PROTO_H_
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_OMAP_COMMON
+#define TI_ARMV7_DRAM_ADDR_SPACE_START	0x80000000
+#define TI_ARMV7_DRAM_ADDR_SPACE_END	0xFFFFFFFF
+
+#define OMAP_INIT_CONTEXT_SPL			0
+#define OMAP_INIT_CONTEXT_UBOOT_FROM_NOR	1
+#define OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL	2
+#define OMAP_INIT_CONTEXT_UBOOT_AFTER_CH	3
+
+static inline u32 running_from_sdram(void)
+{
+	u32 pc;
+	asm volatile ("mov %0, pc" : "=r" (pc));
+	return ((pc >= TI_ARMV7_DRAM_ADDR_SPACE_START) &&
+	    (pc < TI_ARMV7_DRAM_ADDR_SPACE_END));
+}
+
+static inline u8 uboot_loaded_by_spl(void)
+{
+	/*
+	 * u-boot can be running from sdram either because of configuration
+	 * Header or by SPL. If because of CH, then the romcode sets the
+	 * CHSETTINGS executed bit to true in the boot parameter structure that
+	 * it passes to the bootloader.This parameter is stored in the ch_flags
+	 * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a
+	 * mandatory section if CH is present.
+	 */
+	if ((gd->arch.omap_boot_params.ch_flags) & (CH_FLAGS_CHSETTINGS))
+		return 0;
+	else
+		return running_from_sdram();
+}
+
+/*
+ * The basic hardware init of OMAP(s_init()) can happen in 4
+ * different contexts:
+ *  1. SPL running from SRAM
+ *  2. U-Boot running from FLASH
+ *  3. Non-XIP U-Boot loaded to SDRAM by SPL
+ *  4. Non-XIP U-Boot loaded to SDRAM by ROM code using the
+ *     Configuration Header feature
+ *
+ * This function finds this context.
+ * Defining as inline may help in compiling out unused functions in SPL
+ */
+static inline u32 omap_hw_init_context(void)
+{
+#ifdef CONFIG_SPL_BUILD
+	return OMAP_INIT_CONTEXT_SPL;
+#else
+	if (uboot_loaded_by_spl())
+		return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL;
+	else if (running_from_sdram())
+		return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH;
+	else
+		return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;
+#endif
+}
+#endif
+
+#endif