1 files changed, 316 insertions, 0 deletions
diff --git a/board/samsung/smdk6400/lowlevel_init.S b/board/samsung/smdk6400/lowlevel_init.S
new file mode 100644
index 0000000..034c810
--- /dev/null
+++ b/board/samsung/smdk6400/lowlevel_init.S
@@ -0,0 +1,316 @@
+/*
+ * Memory Setup stuff - taken from blob memsetup.S
+ *
+ * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
+ *                     Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
+ *
+ * Modified for the Samsung SMDK2410 by
+ * (C) Copyright 2002
+ * David Mueller, ELSOFT AG, <d.mueller@elsoft.ch>
+ *
+ * (C) Copyright 2008
+ * Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+#include <config.h>
+#include <version.h>
+
+#include <s3c6400.h>
+
+#ifdef CONFIG_SERIAL1
+#define ELFIN_UART_CONSOLE_BASE (ELFIN_UART_BASE + ELFIN_UART0_OFFSET)
+#elif defined(CONFIG_SERIAL2)
+#define ELFIN_UART_CONSOLE_BASE (ELFIN_UART_BASE + ELFIN_UART1_OFFSET)
+#else
+#define ELFIN_UART_CONSOLE_BASE (ELFIN_UART_BASE + ELFIN_UART2_OFFSET)
+#endif
+
+_TEXT_BASE:
+	.word	TEXT_BASE
+
+	.globl lowlevel_init
+lowlevel_init:
+	mov	r12, lr
+
+	/* LED on only #8 */
+	ldr	r0, =ELFIN_GPIO_BASE
+	ldr	r1, =0x55540000
+	str	r1, [r0, #GPNCON_OFFSET]
+
+	ldr	r1, =0x55555555
+	str	r1, [r0, #GPNPUD_OFFSET]
+
+	ldr	r1, =0xf000
+	str	r1, [r0, #GPNDAT_OFFSET]
+
+	/* Disable Watchdog */
+	ldr	r0, =0x7e000000		@0x7e004000
+	orr	r0, r0, #0x4000
+	mov	r1, #0
+	str	r1, [r0]
+
+	/* External interrupt pending clear */
+	ldr	r0, =(ELFIN_GPIO_BASE+EINTPEND_OFFSET)	/*EINTPEND*/
+	ldr	r1, [r0]
+	str	r1, [r0]
+
+	ldr	r0, =ELFIN_VIC0_BASE_ADDR 	@0x71200000
+	ldr	r1, =ELFIN_VIC1_BASE_ADDR 	@0x71300000
+
+	/* Disable all interrupts (VIC0 and VIC1) */
+	mvn	r3, #0x0
+	str	r3, [r0, #oINTMSK]
+	str	r3, [r1, #oINTMSK]
+
+	/* Set all interrupts as IRQ */
+	mov	r3, #0x0
+	str	r3, [r0, #oINTMOD]
+	str	r3, [r1, #oINTMOD]
+
+	/* Pending Interrupt Clear */
+	mov	r3, #0x0
+	str	r3, [r0, #oVECTADDR]
+	str	r3, [r1, #oVECTADDR]
+
+	/* init system clock */
+	bl system_clock_init
+
+#ifndef CONFIG_NAND_SPL
+	/* for UART */
+	bl uart_asm_init
+#endif
+
+#ifdef CONFIG_BOOT_NAND
+	/* simple init for NAND */
+	bl nand_asm_init
+#endif
+
+	bl	mem_ctrl_asm_init
+
+/* Wakeup support. Don't know if it's going to be used, untested. */
+        ldr     r0, =(ELFIN_CLOCK_POWER_BASE + RST_STAT_OFFSET)
+        ldr     r1, [r0]
+        bic     r1, r1, #0xfffffff7
+        cmp     r1, #0x8
+        beq     wakeup_reset
+
+1:
+	mov	lr, r12
+	mov	pc, lr
+
+wakeup_reset:
+
+	/* Clear wakeup status register */
+	ldr	r0, =(ELFIN_CLOCK_POWER_BASE + WAKEUP_STAT_OFFSET)
+	ldr	r1, [r0]
+	str	r1, [r0]
+
+        /* LED test */
+        ldr     r0, =ELFIN_GPIO_BASE
+        ldr     r1, =0x3000
+        str     r1, [r0, #GPNDAT_OFFSET]
+
+	/* Load return address and jump to kernel */
+	ldr	r0, =(ELFIN_CLOCK_POWER_BASE + INF_REG0_OFFSET)
+	/* r1 = physical address of s3c6400_cpu_resume function */
+	ldr	r1, [r0]
+	/* Jump to kernel (sleep-s3c6400.S) */
+	mov	pc, r1
+	nop
+	nop
+/*
+ * system_clock_init: Initialize core clock and bus clock.
+ * void system_clock_init(void)
+ */
+system_clock_init:
+	ldr	r0, =ELFIN_CLOCK_POWER_BASE	/* 0x7e00f000 */
+
+#ifdef CONFIG_SYNC_MODE
+	ldr	r1, [r0, #OTHERS_OFFSET]
+	mov	r2, #0x40
+	orr	r1, r1, r2
+	str	r1, [r0, #OTHERS_OFFSET]
+
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	ldr	r2, =0x80
+	orr	r1, r1, r2
+	str	r1, [r0, #OTHERS_OFFSET]
+
+check_syncack:
+	ldr	r1, [r0, #OTHERS_OFFSET]
+	ldr	r2, =0xf00
+	and	r1, r1, r2
+	cmp	r1, #0xf00
+	bne	check_syncack
+#else	/* ASYNC Mode */
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	/*
+	 * This was unconditional in original Samsung sources, but it doesn't
+	 * seem to make much sense on S3C6400.
+	 */
+#ifndef CONFIG_S3C6400
+	ldr	r1, [r0, #OTHERS_OFFSET]
+	bic	r1, r1, #0xC0
+	orr	r1, r1, #0x40
+	str	r1, [r0, #OTHERS_OFFSET]
+
+wait_for_async:
+	ldr	r1, [r0, #OTHERS_OFFSET]
+	and	r1, r1, #0xf00
+	cmp	r1, #0x0
+	bne	wait_for_async
+#endif
+
+	ldr	r1, [r0, #OTHERS_OFFSET]
+	bic	r1, r1, #0x40
+	str	r1, [r0, #OTHERS_OFFSET]
+#endif
+
+	mov	r1, #0xff00
+	orr	r1, r1, #0xff
+	str	r1, [r0, #APLL_LOCK_OFFSET]
+	str	r1, [r0, #MPLL_LOCK_OFFSET]
+
+	/* Set Clock Divider */
+	ldr   	r1, [r0, #CLK_DIV0_OFFSET]
+	bic	r1, r1, #0x30000
+	bic	r1, r1, #0xff00
+	bic	r1, r1, #0xff
+	ldr	r2, =CLK_DIV_VAL
+	orr	r1, r1, r2
+	str	r1, [r0, #CLK_DIV0_OFFSET]
+
+	ldr	r1, =APLL_VAL
+	str	r1, [r0, #APLL_CON_OFFSET]
+	ldr	r1, =MPLL_VAL
+	str	r1, [r0, #MPLL_CON_OFFSET]
+
+	/* FOUT of EPLL is 96MHz */
+	ldr	r1, =0x200203
+	str	r1, [r0, #EPLL_CON0_OFFSET]
+	ldr	r1, =0x0
+	str	r1, [r0, #EPLL_CON1_OFFSET]
+
+	/* APLL, MPLL, EPLL select to Fout */
+	ldr	r1, [r0, #CLK_SRC_OFFSET]
+	orr	r1, r1, #0x7
+	str	r1, [r0, #CLK_SRC_OFFSET]
+
+	/* wait at least 200us to stablize all clock */
+	mov	r1, #0x10000
+1:	subs	r1, r1, #1
+	bne	1b
+
+	/* Synchronization for VIC port */
+#if defined(CONFIG_SYNC_MODE)
+	ldr	r1, [r0, #OTHERS_OFFSET]
+	orr	r1, r1, #0x20
+	str	r1, [r0, #OTHERS_OFFSET]
+#elif !defined(CONFIG_S3C6400)
+	/* According to 661558um_S3C6400X_rev10.pdf 0x20 is reserved */
+	ldr	r1, [r0, #OTHERS_OFFSET]
+	bic	r1, r1, #0x20
+	str	r1, [r0, #OTHERS_OFFSET]
+#endif
+	mov	pc, lr
+
+
+#ifndef CONFIG_NAND_SPL
+/*
+ * uart_asm_init: Initialize UART's pins
+ */
+uart_asm_init:
+	/* set GPIO to enable UART */
+	ldr	r0, =ELFIN_GPIO_BASE
+	ldr	r1, =0x220022
+	str   	r1, [r0, #GPACON_OFFSET]
+	mov	pc, lr
+#endif
+
+#ifdef CONFIG_BOOT_NAND
+/*
+ * NAND Interface init for SMDK6400
+ */
+nand_asm_init:
+	ldr	r0, =ELFIN_NAND_BASE
+	ldr	r1, [r0, #NFCONF_OFFSET]
+	orr	r1, r1, #0x70
+	orr	r1, r1, #0x7700
+	str     r1, [r0, #NFCONF_OFFSET]
+
+	ldr	r1, [r0, #NFCONT_OFFSET]
+	orr	r1, r1, #0x07
+	str     r1, [r0, #NFCONT_OFFSET]
+
+	mov	pc, lr
+#endif
+
+#ifdef CONFIG_ENABLE_MMU
+/*
+ * MMU Table for SMDK6400
+ */
+
+	/* form a first-level section entry */
+.macro FL_SECTION_ENTRY base,ap,d,c,b
+	.word (\base << 20) | (\ap << 10) | \
+	      (\d << 5) | (1<<4) | (\c << 3) | (\b << 2) | (1<<1)
+.endm
+
+.section .mmudata, "a"
+	.align 14
+	/* the following alignment creates the mmu table at address 0x4000. */
+	.globl mmu_table
+mmu_table:
+	.set __base, 0
+	/* 1:1 mapping for debugging */
+	.rept 0xA00
+	FL_SECTION_ENTRY __base, 3, 0, 0, 0
+	.set __base, __base + 1
+	.endr
+
+	/* access is not allowed. */
+	.rept 0xC00 - 0xA00
+	.word 0x00000000
+	.endr
+
+	/* 128MB for SDRAM 0xC0000000 -> 0x50000000 */
+	.set __base, 0x500
+	.rept 0xC80 - 0xC00
+	FL_SECTION_ENTRY __base, 3, 0, 1, 1
+	.set __base, __base + 1
+	.endr
+
+	/* access is not allowed. */
+	.rept 0x1000 - 0xc80
+	.word 0x00000000
+	.endr
+#endif