diff options
Diffstat (limited to 'board/ti/omap2420h4/lowlevel_init.S')
| -rw-r--r-- | board/ti/omap2420h4/lowlevel_init.S | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/board/ti/omap2420h4/lowlevel_init.S b/board/ti/omap2420h4/lowlevel_init.S deleted file mode 100644 index 2b5f338..0000000 --- a/board/ti/omap2420h4/lowlevel_init.S +++ /dev/null @@ -1,185 +0,0 @@ -/* - * Board specific setup info - * - * (C) Copyright 2004 - * Texas Instruments, <www.ti.com> - * Richard Woodruff <r-woodruff2@ti.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/omap2420.h> -#include <asm/arch/mem.h> -#include <asm/arch/clock.h> - -_TEXT_BASE: - .word CONFIG_SYS_TEXT_BASE /* sdram load addr from config.mk */ - -/************************************************************************** - * cpy_clk_code: relocates clock code into SRAM where its safer to execute - * R1 = SRAM destination address. - *************************************************************************/ -.global cpy_clk_code - cpy_clk_code: - /* Copy DPLL code into SRAM */ - adr r0, go_to_speed /* get addr of clock setting code */ - mov r2, #384 /* r2 size to copy (div by 32 bytes) */ - mov r1, r1 /* r1 <- dest address (passed in) */ - add r2, r2, r0 /* r2 <- source end address */ -next2: - ldmia r0!, {r3-r10} /* copy from source address [r0] */ - stmia r1!, {r3-r10} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - bne next2 - mov pc, lr /* back to caller */ - -/* **************************************************************************** - * go_to_speed: -Moves to bypass, -Commits clock dividers, -puts dpll at speed - * -executed from SRAM. - * R0 = PRCM_CLKCFG_CTRL - addr of valid reg - * R1 = CM_CLKEN_PLL - addr dpll ctlr reg - * R2 = dpll value - * R3 = CM_IDLEST_CKGEN - addr dpll lock wait - ******************************************************************************/ -.global go_to_speed - go_to_speed: - sub sp, sp, #0x4 /* get some stack space */ - str r4, [sp] /* save r4's value */ - - /* move into fast relock bypass */ - ldr r8, pll_ctl_add - mov r4, #0x2 - str r4, [r8] - ldr r4, pll_stat -block: - ldr r8, [r4] /* wait for bypass to take effect */ - and r8, r8, #0x3 - cmp r8, #0x1 - bne block - - /* set new dpll dividers _after_ in bypass */ - ldr r4, pll_div_add - ldr r8, pll_div_val - str r8, [r4] - - /* now prepare GPMC (flash) for new dpll speed */ - /* flash needs to be stable when we jump back to it */ - ldr r4, cfg3_0_addr - ldr r8, cfg3_0_val - str r8, [r4] - ldr r4, cfg4_0_addr - ldr r8, cfg4_0_val - str r8, [r4] - ldr r4, cfg1_0_addr - ldr r8, [r4] - orr r8, r8, #0x3 /* up gpmc divider */ - str r8, [r4] - - /* setup to 2x loop though code. The first loop pre-loads the - * icache, the 2nd commits the prcm config, and locks the dpll - */ - mov r4, #0x1000 /* spin spin spin */ - mov r8, #0x4 /* first pass condition & set registers */ - cmp r8, #0x4 -2: - ldrne r8, [r3] /* DPLL lock check */ - and r8, r8, #0x7 - cmp r8, #0x2 - beq 4f -3: - subeq r8, r8, #0x1 - streq r8, [r0] /* commit dividers (2nd time) */ - nop -lloop1: - sub r4, r4, #0x1 /* Loop currently necessary else bad jumps */ - nop - cmp r4, #0x0 - bne lloop1 - mov r4, #0x40000 - cmp r8, #0x1 - nop - streq r2, [r1] /* lock dpll (2nd time) */ - nop -lloop2: - sub r4, r4, #0x1 /* loop currently necessary else bad jumps */ - nop - cmp r4, #0x0 - bne lloop2 - mov r4, #0x40000 - cmp r8, #0x1 - nop - ldreq r8, [r3] /* get lock condition for dpll */ - cmp r8, #0x4 /* first time though? */ - bne 2b - moveq r8, #0x2 /* set to dpll check condition. */ - beq 3b /* if condition not true branch */ -4: - ldr r4, [sp] - add sp, sp, #0x4 /* return stack space */ - mov pc, lr /* back to caller, locked */ - -_go_to_speed: .word go_to_speed - -/* these constants need to be close for PIC code */ -cfg3_0_addr: - .word GPMC_CONFIG3_0 -cfg3_0_val: - .word H4_24XX_GPMC_CONFIG3_0 -cfg4_0_addr: - .word GPMC_CONFIG4_0 -cfg4_0_val: - .word H4_24XX_GPMC_CONFIG4_0 -cfg1_0_addr: - .word GPMC_CONFIG1_0 -pll_ctl_add: - .word CM_CLKEN_PLL -pll_stat: - .word CM_IDLEST_CKGEN -pll_div_add: - .word CM_CLKSEL1_PLL -pll_div_val: - .word DPLL_VAL /* DPLL setting (300MHz default) */ - -.globl lowlevel_init -lowlevel_init: - ldr sp, SRAM_STACK - str ip, [sp] /* stash old link register */ - mov ip, lr /* save link reg across call */ - bl s_init /* go setup pll,mux,memory */ - ldr ip, [sp] /* restore save ip */ - mov lr, ip /* restore link reg */ - - /* map interrupt controller */ - ldr r0, VAL_INTH_SETUP - mcr p15, 0, r0, c15, c2, 4 - - /* back to arch calling code */ - mov pc, lr - - /* the literal pools origin */ - .ltorg - -REG_CONTROL_STATUS: - .word CONTROL_STATUS -VAL_INTH_SETUP: - .word PERIFERAL_PORT_BASE -SRAM_STACK: - .word LOW_LEVEL_SRAM_STACK |