| /* |
| * 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 TEXT_BASE /* sdram load addr from config.mk */ |
| |
| #ifdef CONFIG_PARTIAL_SRAM |
| |
| /************************************************************************** |
| * 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) */ |
| #endif |
| |
| .globl platformsetup |
| platformsetup: |
| mov r3, r0 /* save skip information */ |
| #ifdef CONFIG_APTIX |
| ldr r0, REG_SDRC_MCFG_0 |
| ldr r1, VAL_SDRC_MCFG_0 |
| str r1, [r0] |
| ldr r0, REG_SDRC_MR_0 |
| ldr r1, VAL_SDRC_MR_0 |
| str r1, [r0] |
| /* a ddr needs emr1 set here */ |
| ldr r0, REG_SDRC_SHARING |
| ldr r1, VAL_SDRC_SHARING |
| str r1, [r0] |
| ldr r0, REG_SDRC_RFR_CTRL_0 |
| ldr r1, VAL_SDRC_RFR_CTRL_0 |
| str r1, [r0] |
| |
| /* little delay after init */ |
| mov r2, #0x1800 |
| 1: |
| subs r2, r2, #0x1 |
| bne 1b |
| #endif |
| #ifdef CONFIG_PARTIAL_SRAM |
| ldr sp, SRAM_STACK |
| str ip, [sp] /* stash old link register */ |
| mov ip, lr /* save link reg across call */ |
| mov r0, r3 /* pass skip info to s_init */ |
| bl s_init /* go setup pll,mux,memory */ |
| ldr ip, [sp] /* restore save ip */ |
| mov lr, ip /* restore link reg */ |
| #endif |
| /* 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 |
| |
| #ifdef CONFIG_APTIX |
| REG_SDRC_SHARING: |
| .word SDRC_SHARING |
| REG_SDRC_MCFG_0: |
| .word SDRC_MCFG_0 |
| REG_SDRC_MR_0: |
| .word SDRC_MR_0 |
| REG_SDRC_RFR_CTRL_0: |
| .word SDRC_RFR_CTRL |
| VAL_SDRC_SHARING: |
| .word VAL_H4_SDRC_SHARING |
| VAL_SDRC_MCFG_0: |
| .word VAL_H4_SDRC_MCFG_0 |
| VAL_SDRC_MR_0: |
| .word VAL_H4_SDRC_MR_0 |
| VAL_SDRC_RFR_CTRL_0: |
| .word VAL_H4_SDRC_RFR_CTRL_0 |
| #endif |
| |
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