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

2026-09-06 03:52:57 +08:00
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  armboot - Startup Code for SA1100 CPU
+ *
+ *  Copyright (C) 1998	Dan Malek <dmalek@jlc.net>
+ *  Copyright (C) 1999	Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
+ *  Copyright (C) 2000	Wolfgang Denk <wd@denx.de>
+ *  Copyright (c) 2001	Alex Züpke <azu@sysgo.de>
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * relocate armboot to ram
+ * setup stack
+ * jump to second stage
+ *
+ *************************************************************************
+ */
+
+	.globl	reset
+
+reset:
+	/*
+	 * set the cpu to SVC32 mode
+	 */
+	mrs	r0,cpsr
+	bic	r0,r0,#0x1f
+	orr	r0,r0,#0xd3
+	msr	cpsr,r0
+
+	/*
+	 * we do sys-critical inits only at reboot,
+	 * not when booting from ram!
+	 */
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+	bl	cpu_init_crit
+#endif
+
+	bl	_main
+
+/*------------------------------------------------------------------------------*/
+
+	.globl	c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+	mov	pc, lr
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+
+
+/* Interrupt-Controller base address */
+IC_BASE:	.word	0x90050000
+#define ICMR	0x04
+
+
+/* Reset-Controller */
+RST_BASE:		.word   0x90030000
+#define RSRR	0x00
+#define RCSR	0x04
+
+
+/* PWR */
+PWR_BASE:		.word   0x90020000
+#define PSPR    0x08
+#define PPCR    0x14
+cpuspeed:		.word   CONFIG_SYS_CPUSPEED
+
+
+cpu_init_crit:
+	/*
+	 * mask all IRQs
+	 */
+	ldr	r0, IC_BASE
+	mov	r1, #0x00
+	str	r1, [r0, #ICMR]
+
+	/* set clock speed */
+	ldr	r0, PWR_BASE
+	ldr	r1, cpuspeed
+	str	r1, [r0, #PPCR]
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT_ONLY
+	/*
+	 * before relocating, we have to setup RAM timing
+	 * because memory timing is board-dependend, you will
+	 * find a lowlevel_init.S in your board directory.
+	 */
+	mov	ip,	lr
+	bl	lowlevel_init
+	mov	lr,	ip
+#endif
+
+	/*
+	 * disable MMU stuff and enable I-cache
+	 */
+	mrc	p15,0,r0,c1,c0
+	bic	r0, r0, #0x00002000	@ clear bit 13 (X)
+	bic	r0, r0, #0x0000000f	@ clear bits 3-0 (WCAM)
+	orr	r0, r0, #0x00001000	@ set bit 12 (I) Icache
+	orr	r0, r0, #0x00000002	@ set bit 1 (A) Align
+	mcr	p15,0,r0,c1,c0
+
+	/*
+	 * flush v4 I/D caches
+	 */
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c7, 0	/* flush v3/v4 cache */
+	mcr	p15, 0, r0, c8, c7, 0	/* flush v4 TLB */
+
+	mov	pc, lr