diff options
Diffstat (limited to 'board/omap730p2/lowlevel_init.S')
| -rw-r--r-- | board/omap730p2/lowlevel_init.S | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/board/omap730p2/lowlevel_init.S b/board/omap730p2/lowlevel_init.S new file mode 100644 index 0000000..6c6f482 --- /dev/null +++ b/board/omap730p2/lowlevel_init.S @@ -0,0 +1,395 @@ +/* + * Board specific setup info + * + * (C) Copyright 2003-2004 + * + * Texas Instruments, <www.ti.com> + * Kshitij Gupta <Kshitij@ti.com> + * + * Modified for OMAP 1610 H2 board by Nishant Kamat, Jan 2004 + * + * Modified for OMAP730 P2 Board by Dave Peverley, MPC-Data Limited + * (http://www.mpc-data.co.uk) + * + * TODO : Tidy up and change to use system register defines + * from omap730.h where possible. + * + * 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> + +#if defined(CONFIG_OMAP730) +#include <./configs/omap730.h> +#endif + +_TEXT_BASE: + .word TEXT_BASE /* sdram load addr from config.mk */ + +.globl lowlevel_init +lowlevel_init: + /* Save callers address in r11 - r11 must never be modified */ + mov r11, lr + + /*------------------------------------------------------* + *mask all IRQs by setting all bits in the INTMR default* + *------------------------------------------------------*/ + mov r1, #0xffffffff + ldr r0, =REG_IHL1_MIR + str r1, [r0] + ldr r0, =REG_IHL2_MIR + str r1, [r0] + + /*------------------------------------------------------* + * Set up ARM CLM registers (IDLECT1) * + *------------------------------------------------------*/ + ldr r0, REG_ARM_IDLECT1 + ldr r1, VAL_ARM_IDLECT1 + str r1, [r0] + + /*------------------------------------------------------* + * Set up ARM CLM registers (IDLECT2) * + *------------------------------------------------------*/ + ldr r0, REG_ARM_IDLECT2 + ldr r1, VAL_ARM_IDLECT2 + str r1, [r0] + + /*------------------------------------------------------* + * Set up ARM CLM registers (IDLECT3) * + *------------------------------------------------------*/ + ldr r0, REG_ARM_IDLECT3 + ldr r1, VAL_ARM_IDLECT3 + str r1, [r0] + + + mov r1, #0x01 /* PER_EN bit */ + ldr r0, REG_ARM_RSTCT2 + strh r1, [r0] /* CLKM; Peripheral reset. */ + + /* Set CLKM to Sync-Scalable */ + /* I supposedly need to enable the dsp clock before switching */ + mov r1, #0x1000 + ldr r0, REG_ARM_SYSST + strh r1, [r0] + mov r0, #0x400 +1: + subs r0, r0, #0x1 /* wait for any bubbles to finish */ + bne 1b + ldr r1, VAL_ARM_CKCTL + ldr r0, REG_ARM_CKCTL + strh r1, [r0] + + /* a few nops to let settle */ + nop + nop + nop + nop + nop + nop + nop + nop + nop + nop + + /* setup DPLL 1 */ + /* Ramp up the clock to 96Mhz */ + ldr r1, VAL_DPLL1_CTL + ldr r0, REG_DPLL1_CTL + strh r1, [r0] + ands r1, r1, #0x10 /* Check if PLL is enabled. */ + beq lock_end /* Do not look for lock if BYPASS selected */ +2: + ldrh r1, [r0] + ands r1, r1, #0x01 /* Check the LOCK bit.*/ + beq 2b /* loop until bit goes hi. */ +lock_end: + + /*------------------------------------------------------* + * Turn off the watchdog during init... * + *------------------------------------------------------*/ + ldr r0, REG_WATCHDOG + ldr r1, WATCHDOG_VAL1 + str r1, [r0] + ldr r1, WATCHDOG_VAL2 + str r1, [r0] + ldr r0, REG_WSPRDOG + ldr r1, WSPRDOG_VAL1 + str r1, [r0] + ldr r0, REG_WWPSDOG + +watch1Wait: + ldr r1, [r0] + tst r1, #0x10 + bne watch1Wait + + ldr r0, REG_WSPRDOG + ldr r1, WSPRDOG_VAL2 + str r1, [r0] + ldr r0, REG_WWPSDOG +watch2Wait: + ldr r1, [r0] + tst r1, #0x10 + bne watch2Wait + + /* Set memory timings corresponding to the new clock speed */ + + /* Check execution location to determine current execution location + * and branch to appropriate initialization code. + */ + /* Compare physical SDRAM base & current execution location. */ + and r0, pc, #0xF0000000 + /* Compare. */ + cmp r0, #0 + /* Skip over EMIF-fast initialization if running from SDRAM. */ + bne skip_sdram + + /* + * Delay for SDRAM initialization. + */ + mov r3, #0x1800 /* value should be checked */ +3: + subs r3, r3, #0x1 /* Decrement count */ + bne 3b + + ldr r0, REG_SDRAM_CONFIG + ldr r1, SDRAM_CONFIG_VAL + str r1, [r0] + + ldr r0, REG_SDRAM_MRS_LEGACY + ldr r1, SDRAM_MRS_VAL + str r1, [r0] + +skip_sdram: + +common_tc: + /* slow interface */ + ldr r1, VAL_TC_EMIFS_CS0_CONFIG + ldr r0, REG_TC_EMIFS_CS0_CONFIG + str r1, [r0] /* Chip Select 0 */ + + ldr r1, VAL_TC_EMIFS_CS1_CONFIG + ldr r0, REG_TC_EMIFS_CS1_CONFIG + str r1, [r0] /* Chip Select 1 */ + ldr r1, VAL_TC_EMIFS_CS2_CONFIG + ldr r0, REG_TC_EMIFS_CS2_CONFIG + str r1, [r0] /* Chip Select 2 */ + ldr r1, VAL_TC_EMIFS_CS3_CONFIG + ldr r0, REG_TC_EMIFS_CS3_CONFIG + str r1, [r0] /* Chip Select 3 */ + + /* 48MHz clock request for UART1 */ + ldr r1, PERSEUS2_CONFIG_BASE + ldrh r0, [r1, #CONFIG_PCC_CONF] + orr r0, r0, #CONF_MOD_UART1_CLK_MODE_R + strh r0, [r1, #CONFIG_PCC_CONF] + + /* Initialize public and private rheas + * - set access factor 2 on both rhea / strobe + * - disable write buffer on strb0, enable write buffer on strb1 + */ + + ldr R0, REG_RHEA_PUB_CTL + ldr R1, REG_RHEA_PRIV_CTL + ldr R2, VAL_RHEA_CTL + strh R2, [R0] + strh R2, [R1] + mov R3, #2 /* disable write buffer on strb0, enable write buffer on strb1 */ + strh R3, [R0, #0x08] /* arm rhea control reg */ + strh R3, [R1, #0x08] + + /* enable IRQ and FIQ */ + + mrs r4, CPSR + bic r4, r4, #IRQ_MASK + bic r4, r4, #FIQ_MASK + msr CPSR, r4 + + /* set TAP CONF to TRI EMULATION */ + + ldr r1, [r0, #CONFIG_MODE2] + bic r1, r1, #0x18 + orr r1, r1, #0x10 + str r1, [r0, #CONFIG_MODE2] + + /* set tdbgen to 1 */ + + ldr r0, PERSEUS2_CONFIG_BASE + ldr r1, [r0, #CONFIG_MODE1] + mov r2, #0x10000 + orr r1, r1, r2 + str r1, [r0, #CONFIG_MODE1] + +#ifdef CONFIG_P2_OMAP1610 + /* inserting additional 2 clock cycle hold time for LAN */ + ldr r0, REG_TC_EMIFS_CS1_ADVANCED + ldr r1, VAL_TC_EMIFS_CS1_ADVANCED + str r1, [r0] +#endif + /* Start MPU Timer 1 */ + ldr r0, REG_MPU_LOAD_TIMER + ldr r1, VAL_MPU_LOAD_TIMER + str r1, [r0] + + ldr r0, REG_MPU_CNTL_TIMER + ldr r1, VAL_MPU_CNTL_TIMER + str r1, [r0] + + /* back to arch calling code */ + mov pc, r11 + + /* the literal pools origin */ + .ltorg + +REG_TC_EMIFS_CONFIG: /* 32 bits */ + .word 0xfffecc0c +REG_TC_EMIFS_CS0_CONFIG: /* 32 bits */ + .word 0xfffecc10 +REG_TC_EMIFS_CS1_CONFIG: /* 32 bits */ + .word 0xfffecc14 +REG_TC_EMIFS_CS2_CONFIG: /* 32 bits */ + .word 0xfffecc18 +REG_TC_EMIFS_CS3_CONFIG: /* 32 bits */ + .word 0xfffecc1c + +#ifdef CONFIG_P2_OMAP730 +REG_TC_EMIFS_CS1_ADVANCED: /* 32 bits */ + .word 0xfffecc54 +#endif + +/* MPU clock/reset/power mode control registers */ +REG_ARM_CKCTL: /* 16 bits */ + .word 0xfffece00 + +REG_ARM_IDLECT3: /* 16 bits */ + .word 0xfffece24 +REG_ARM_IDLECT2: /* 16 bits */ + .word 0xfffece08 +REG_ARM_IDLECT1: /* 16 bits */ + .word 0xfffece04 + +REG_ARM_RSTCT2: /* 16 bits */ + .word 0xfffece14 +REG_ARM_SYSST: /* 16 bits */ + .word 0xfffece18 +/* DPLL control registers */ +REG_DPLL1_CTL: /* 16 bits */ + .word 0xfffecf00 + +/* Watch Dog register */ +/* secure watchdog stop */ +REG_WSPRDOG: + .word 0xfffeb048 +/* watchdog write pending */ +REG_WWPSDOG: + .word 0xfffeb034 + +WSPRDOG_VAL1: + .word 0x0000aaaa +WSPRDOG_VAL2: + .word 0x00005555 + +/* SDRAM config is: auto refresh enabled, 16 bit 4 bank, + counter @8192 rows, 10 ns, 8 burst */ +REG_SDRAM_CONFIG: + .word 0xfffecc20 + +REG_SDRAM_MRS_LEGACY: + .word 0xfffecc24 + +REG_WATCHDOG: + .word 0xfffec808 + +REG_MPU_LOAD_TIMER: + .word 0xfffec600 +REG_MPU_CNTL_TIMER: + .word 0xfffec500 + +/* Public and private rhea bridge registers definition */ + +REG_RHEA_PUB_CTL: + .word 0xFFFECA00 + +REG_RHEA_PRIV_CTL: + .word 0xFFFED300 + +/* EMIFF SDRAM Configuration register + - self refresh disable + - auto refresh enabled + - SDRAM type 64 Mb, 16 bits bus 4 banks + - power down enabled + - SDRAM clock disabled + */ +SDRAM_CONFIG_VAL: + .word 0x0C017DF4 + +/* Burst full page length ; cas latency = 3 */ +SDRAM_MRS_VAL: + .word 0x00000037 + +VAL_ARM_CKCTL: + .word 0x6505 +VAL_DPLL1_CTL: + .word 0x3412 + +#ifdef CONFIG_P2_OMAP730 +VAL_TC_EMIFS_CS0_CONFIG: + .word 0x0000FFF3 +VAL_TC_EMIFS_CS1_CONFIG: + .word 0x00004278 +VAL_TC_EMIFS_CS2_CONFIG: + .word 0x00004278 +VAL_TC_EMIFS_CS3_CONFIG: + .word 0x00004278 +VAL_TC_EMIFS_CS1_ADVANCED: + .word 0x00000022 +#endif + +VAL_ARM_IDLECT1: + .word 0x00000400 +VAL_ARM_IDLECT2: + .word 0x00000886 +VAL_ARM_IDLECT3: + .word 0x00000015 + +WATCHDOG_VAL1: + .word 0x000000f5 +WATCHDOG_VAL2: + .word 0x000000a0 + +VAL_MPU_LOAD_TIMER: + .word 0xffffffff +VAL_MPU_CNTL_TIMER: + .word 0xffffffa1 + +VAL_RHEA_CTL: + .word 0xFF22 + +/* Config Register vals */ +PERSEUS2_CONFIG_BASE: + .word 0xFFFE1000 + +.equ CONFIG_PCC_CONF, 0xB4 +.equ CONFIG_MODE1, 0x10 +.equ CONFIG_MODE2, 0x14 +.equ CONF_MOD_UART1_CLK_MODE_R, 0x0A + +/* misc values */ +.equ IRQ_MASK, 0x80 /* IRQ mask value */ +.equ FIQ_MASK, 0x40 /* FIQ mask value */ |