diff options
Diffstat (limited to 'board/samsung/smdkc100/lowlevel_init.S')
| -rw-r--r-- | board/samsung/smdkc100/lowlevel_init.S | 215 |
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 |