GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2012 Nobuhiro Iwamatsu <nobuhiro.Iwamatsu.yj@renesas.com>
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ */
+
+#include <config.h>
+#include <linux/linkage.h>
+
+ENTRY(lowlevel_init)
+	ldr		r0, =MERAM_BASE
+	mov		r1, #0x0
+	str		r1, [r0]
+
+	mrc		p15, 0, r0, c0, c0, 5
+	ands	r0, r0, #0xF
+	beq		lowlevel_init__
+	b		wait_interrupt
+
+	.pool
+	.align 4
+
+wait_interrupt:
+#ifdef ICCICR
+	ldr     r1, =ICCICR
+	mov     r2, #0x0
+	str     r2, [r1]
+	mov     r2, #0xF0
+	adds    r1, r1, #4 /* ICCPMR */
+	str     r2, [r1]
+	ldr     r1, =ICCICR
+	mov     r2, #0x1
+	str     r2, [r1]
+#endif
+
+wait_loop:
+	.long	0xE320F003 /* wfi */
+
+	ldr		r2, [r1, #0xC]
+	str		r2, [r1, #0x10]
+
+	ldr		r0, =MERAM_BASE
+	ldr		r2, [r0]
+	cmp		r2, #0
+	movne	pc, r2
+
+	b		wait_loop
+
+wait_loop_end:
+	.pool
+	.align 4
+
+lowlevel_init__:
+
+	mov r0, #0x200000
+
+loop0:
+	subs r0, r0, #1
+	bne  loop0
+
+	ldr sp, MERAM_STACK
+	b s_init
+
+	.pool
+	.align 4
+
+ENDPROC(lowlevel_init)
+	.ltorg
+
+MERAM_STACK:
+	.word LOW_LEVEL_MERAM_STACK