+++ /dev/null
-/*
- * 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/clocks.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
projects / karo-tx-uboot.git / blobdiff