armv7:TI: Add <asm/ti-common/sys_proto.h> and migrate omap_hw_init_context

The omap_hw_init_context function (and assorted helpers) is the same for
all OMAP-derived parts as when CHSETTINGS are used, that's the same and
our DDR base is also always the same.  In order to make this common we
simply need to update the names of the define for DDR address space
which is also common.

Cc: Sricharan R. <r.sricharan@ti.com>
Cc: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>

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