summaryrefslogtreecommitdiff
path: root/board/samsung/smdkc100/lowlevel_init.S
diff options
context:
space:
mode:
Diffstat (limited to 'board/samsung/smdkc100/lowlevel_init.S')
-rw-r--r--board/samsung/smdkc100/lowlevel_init.S215
1 files changed, 215 insertions, 0 deletions
diff --git a/board/samsung/smdkc100/lowlevel_init.S b/board/samsung/smdkc100/lowlevel_init.S
new file mode 100644
index 0000000..32572c5
--- /dev/null
+++ b/board/samsung/smdkc100/lowlevel_init.S
@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2009 Samsung Electronics
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ * Minkyu Kang <mk7.kang@samsung.com>
+ *
+ * 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 <asm/arch/cpu.h>
+#include <asm/arch/power.h>
+
+/*
+ * Register usages:
+ *
+ * r5 has zero always
+ */
+
+_TEXT_BASE:
+ .word TEXT_BASE
+
+ .globl lowlevel_init
+lowlevel_init:
+ mov r9, lr
+
+ /* r5 has always zero */
+ mov r5, #0
+
+ ldr r8, =S5PC100_GPIO_BASE
+
+ /* Disable Watchdog */
+ ldr r0, =S5PC100_WATCHDOG_BASE @0xEA200000
+ orr r0, r0, #0x0
+ str r5, [r0]
+
+#ifndef CONFIG_ONENAND_IPL
+ /* setting SRAM */
+ ldr r0, =S5PC100_SROMC_BASE
+ ldr r1, =0x9
+ str r1, [r0]
+#endif
+
+ /* S5PC100 has 3 groups of interrupt sources */
+ ldr r0, =S5PC100_VIC0_BASE @0xE4000000
+ ldr r1, =S5PC100_VIC1_BASE @0xE4000000
+ ldr r2, =S5PC100_VIC2_BASE @0xE4000000
+
+ /* Disable all interrupts (VIC0, VIC1 and VIC2) */
+ mvn r3, #0x0
+ str r3, [r0, #0x14] @INTENCLEAR
+ str r3, [r1, #0x14] @INTENCLEAR
+ str r3, [r2, #0x14] @INTENCLEAR
+
+#ifndef CONFIG_ONENAND_IPL
+ /* Set all interrupts as IRQ */
+ str r5, [r0, #0xc] @INTSELECT
+ str r5, [r1, #0xc] @INTSELECT
+ str r5, [r2, #0xc] @INTSELECT
+
+ /* Pending Interrupt Clear */
+ str r5, [r0, #0xf00] @INTADDRESS
+ str r5, [r1, #0xf00] @INTADDRESS
+ str r5, [r2, #0xf00] @INTADDRESS
+#endif
+
+#ifndef CONFIG_ONENAND_IPL
+ /* for UART */
+ bl uart_asm_init
+
+ /* for TZPC */
+ bl tzpc_asm_init
+#endif
+
+#ifdef CONFIG_ONENAND_IPL
+ /* init system clock */
+ bl system_clock_init
+
+ bl mem_ctrl_asm_init
+
+ /* Wakeup support. Don't know if it's going to be used, untested. */
+ ldr r0, =S5PC100_RST_STAT
+ ldr r1, [r0]
+ bic r1, r1, #0xfffffff7
+ cmp r1, #0x8
+ beq wakeup_reset
+#endif
+
+1:
+ mov lr, r9
+ mov pc, lr
+
+#ifdef CONFIG_ONENAND_IPL
+wakeup_reset:
+
+ /* Clear wakeup status register */
+ ldr r0, =S5PC100_WAKEUP_STAT
+ ldr r1, [r0]
+ str r1, [r0]
+
+ /* Load return address and jump to kernel */
+ ldr r0, =S5PC100_INFORM0
+
+ /* r1 = physical address of s5pc100_cpu_resume function */
+ ldr r1, [r0]
+
+ /* Jump to kernel (sleep.S) */
+ mov pc, r1
+ nop
+ nop
+#endif
+
+/*
+ * system_clock_init: Initialize core clock and bus clock.
+ * void system_clock_init(void)
+ */
+system_clock_init:
+ ldr r8, =S5PC1XX_CLOCK_BASE @ 0xE0100000
+
+ /* Set Clock divider */
+ ldr r1, =0x00011110
+ str r1, [r8, #0x304]
+ ldr r1, =0x1
+ str r1, [r8, #0x308]
+ ldr r1, =0x00011301
+ str r1, [r8, #0x300]
+
+ /* Set Lock Time */
+ ldr r1, =0xe10 @ Locktime : 0xe10 = 3600
+ str r1, [r8, #0x000] @ APLL_LOCK
+ str r1, [r8, #0x004] @ MPLL_LOCK
+ str r1, [r8, #0x008] @ EPLL_LOCK
+ str r1, [r8, #0x00C] @ HPLL_LOCK
+
+ /* APLL_CON */
+ ldr r1, =0x81bc0400 @ SDIV 0, PDIV 4, MDIV 444 (1332MHz)
+ str r1, [r8, #0x100]
+ /* MPLL_CON */
+ ldr r1, =0x80590201 @ SDIV 1, PDIV 2, MDIV 89 (267MHz)
+ str r1, [r8, #0x104]
+ /* EPLL_CON */
+ ldr r1, =0x80870303 @ SDIV 3, PDIV 3, MDIV 135 (67.5MHz)
+ str r1, [r8, #0x108]
+ /* HPLL_CON */
+ ldr r1, =0x80600603
+ str r1, [r8, #0x10C]
+
+ /* Set Source Clock */
+ ldr r1, =0x1111 @ A, M, E, HPLL Muxing
+ str r1, [r8, #0x200] @ CLK_SRC0
+
+ ldr r1, =0x1000001 @ Uart Clock & CLK48M Muxing
+ str r1, [r8, #0x204] @ CLK_SRC1
+
+ ldr r1, =0x9000 @ ARMCLK/4
+ str r1, [r8, #0x400] @ CLK_OUT
+
+ /* wait at least 200us to stablize all clock */
+ mov r2, #0x10000
+1: subs r2, r2, #1
+ bne 1b
+
+ mov pc, lr
+
+#ifndef CONFIG_ONENAND_IPL
+/*
+ * uart_asm_init: Initialize UART's pins
+ */
+uart_asm_init:
+ mov r0, r8
+ ldr r1, =0x22222222
+ str r1, [r0, #0x0] @ GPA0_CON
+ ldr r1, =0x00022222
+ str r1, [r0, #0x20] @ GPA1_CON
+
+ mov pc, lr
+
+/*
+ * tzpc_asm_init: Initialize TZPC
+ */
+tzpc_asm_init:
+ ldr r0, =0xE3800000
+ mov r1, #0x0
+ str r1, [r0]
+ mov r1, #0xff
+ str r1, [r0, #0x804]
+ str r1, [r0, #0x810]
+
+ ldr r0, =0xE2800000
+ str r1, [r0, #0x804]
+ str r1, [r0, #0x810]
+ str r1, [r0, #0x81C]
+
+ ldr r0, =0xE2900000
+ str r1, [r0, #0x804]
+ str r1, [r0, #0x810]
+
+ mov pc, lr
+#endif