diff options
Diffstat (limited to 'arch/arm/cpu/arm926ejs/davinci/lowlevel_init.S')
-rw-r--r-- | arch/arm/cpu/arm926ejs/davinci/lowlevel_init.S | 707 |
1 files changed, 707 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm926ejs/davinci/lowlevel_init.S b/arch/arm/cpu/arm926ejs/davinci/lowlevel_init.S new file mode 100644 index 0000000..0a4b2cf --- /dev/null +++ b/arch/arm/cpu/arm926ejs/davinci/lowlevel_init.S @@ -0,0 +1,707 @@ +/* + * Low-level board setup code for TI DaVinci SoC based boards. + * + * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> + * + * Partially based on TI sources, original copyrights follow: + */ + +/* + * Board specific setup info + * + * (C) Copyright 2003 + * Texas Instruments, <www.ti.com> + * Kshitij Gupta <Kshitij@ti.com> + * + * Modified for OMAP 1610 H2 board by Nishant Kamat, Jan 2004 + * + * Modified for OMAP 5912 OSK board by Rishi Bhattacharya, Apr 2004 + * See file CREDITS for list of people who contributed to this + * project. + * + * Modified for DV-EVM board by Rishi Bhattacharya, Apr 2005 + * See file CREDITS for list of people who contributed to this + * project. + * + * Modified for DV-EVM board by Swaminathan S, Nov 2005 + * 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> + +.globl lowlevel_init +lowlevel_init: + + /*-------------------------------------------------------* + * Mask all IRQs by setting all bits in the EINT default * + *-------------------------------------------------------*/ + mov r1, $0 + ldr r0, =EINT_ENABLE0 + str r1, [r0] + ldr r0, =EINT_ENABLE1 + str r1, [r0] + + /*------------------------------------------------------* + * Put the GEM in reset * + *------------------------------------------------------*/ + + /* Put the GEM in reset */ + ldr r8, PSC_GEM_FLAG_CLEAR + ldr r6, MDCTL_GEM + ldr r7, [r6] + and r7, r7, r8 + str r7, [r6] + + /* Enable the Power Domain Transition Command */ + ldr r6, PTCMD + ldr r7, [r6] + orr r7, r7, $0x02 + str r7, [r6] + + /* Check for Transition Complete(PTSTAT) */ +checkStatClkStopGem: + ldr r6, PTSTAT + ldr r7, [r6] + ands r7, r7, $0x02 + bne checkStatClkStopGem + + /* Check for GEM Reset Completion */ +checkGemStatClkStop: + ldr r6, MDSTAT_GEM + ldr r7, [r6] + ands r7, r7, $0x100 + bne checkGemStatClkStop + + /* Do this for enabling a WDT initiated reset this is a workaround + for a chip bug. Not required under normal situations */ + ldr r6, P1394 + mov r10, $0 + str r10, [r6] + + /*------------------------------------------------------* + * Enable L1 & L2 Memories in Fast mode * + *------------------------------------------------------*/ + ldr r6, DFT_ENABLE + mov r10, $0x01 + str r10, [r6] + + ldr r6, MMARG_BRF0 + ldr r10, MMARG_BRF0_VAL + str r10, [r6] + + ldr r6, DFT_ENABLE + mov r10, $0 + str r10, [r6] + + /*------------------------------------------------------* + * DDR2 PLL Initialization * + *------------------------------------------------------*/ + + /* Select the Clock Mode Depending on the Value written in the Boot Table by the run script */ + mov r10, $0 + ldr r6, PLL2_CTL + ldr r7, PLL_CLKSRC_MASK + ldr r8, [r6] + and r8, r8, r7 + mov r9, r10, lsl $8 + orr r8, r8, r9 + str r8, [r6] + + /* Select the PLLEN source */ + ldr r7, PLL_ENSRC_MASK + and r8, r8, r7 + str r8, [r6] + + /* Bypass the PLL */ + ldr r7, PLL_BYPASS_MASK + and r8, r8, r7 + str r8, [r6] + + /* Wait for few cycles to allow PLLEN Mux switch properly to bypass Clock */ + mov r10, $0x20 +WaitPPL2Loop: + subs r10, r10, $1 + bne WaitPPL2Loop + + /* Reset the PLL */ + ldr r7, PLL_RESET_MASK + and r8, r8, r7 + str r8, [r6] + + /* Power up the PLL */ + ldr r7, PLL_PWRUP_MASK + and r8, r8, r7 + str r8, [r6] + + /* Enable the PLL from Disable Mode */ + ldr r7, PLL_DISABLE_ENABLE_MASK + and r8, r8, r7 + str r8, [r6] + + /* Program the PLL Multiplier */ + ldr r6, PLL2_PLLM + mov r2, $0x17 /* 162 MHz */ + str r2, [r6] + + /* Program the PLL2 Divisor Value */ + ldr r6, PLL2_DIV2 + mov r3, $0x01 + str r3, [r6] + + /* Program the PLL2 Divisor Value */ + ldr r6, PLL2_DIV1 + mov r4, $0x0b /* 54 MHz */ + str r4, [r6] + + /* PLL2 DIV2 MMR */ + ldr r8, PLL2_DIV_MASK + ldr r6, PLL2_DIV2 + ldr r9, [r6] + and r8, r8, r9 + mov r9, $0x01 + mov r9, r9, lsl $15 + orr r8, r8, r9 + str r8, [r6] + + /* Program the GOSET bit to take new divider values */ + ldr r6, PLL2_PLLCMD + ldr r7, [r6] + orr r7, r7, $0x01 + str r7, [r6] + + /* Wait for Done */ + ldr r6, PLL2_PLLSTAT +doneLoop_0: + ldr r7, [r6] + ands r7, r7, $0x01 + bne doneLoop_0 + + /* PLL2 DIV1 MMR */ + ldr r8, PLL2_DIV_MASK + ldr r6, PLL2_DIV1 + ldr r9, [r6] + and r8, r8, r9 + mov r9, $0x01 + mov r9, r9, lsl $15 + orr r8, r8, r9 + str r8, [r6] + + /* Program the GOSET bit to take new divider values */ + ldr r6, PLL2_PLLCMD + ldr r7, [r6] + orr r7, r7, $0x01 + str r7, [r6] + + /* Wait for Done */ + ldr r6, PLL2_PLLSTAT +doneLoop: + ldr r7, [r6] + ands r7, r7, $0x01 + bne doneLoop + + /* Wait for PLL to Reset Properly */ + mov r10, $0x218 +ResetPPL2Loop: + subs r10, r10, $1 + bne ResetPPL2Loop + + /* Bring PLL out of Reset */ + ldr r6, PLL2_CTL + ldr r8, [r6] + orr r8, r8, $0x08 + str r8, [r6] + + /* Wait for PLL to Lock */ + ldr r10, PLL_LOCK_COUNT +PLL2Lock: + subs r10, r10, $1 + bne PLL2Lock + + /* Enable the PLL */ + ldr r6, PLL2_CTL + ldr r8, [r6] + orr r8, r8, $0x01 + str r8, [r6] + + /*------------------------------------------------------* + * Issue Soft Reset to DDR Module * + *------------------------------------------------------*/ + + /* Shut down the DDR2 LPSC Module */ + ldr r8, PSC_FLAG_CLEAR + ldr r6, MDCTL_DDR2 + ldr r7, [r6] + and r7, r7, r8 + orr r7, r7, $0x03 + str r7, [r6] + + /* Enable the Power Domain Transition Command */ + ldr r6, PTCMD + ldr r7, [r6] + orr r7, r7, $0x01 + str r7, [r6] + + /* Check for Transition Complete(PTSTAT) */ +checkStatClkStop: + ldr r6, PTSTAT + ldr r7, [r6] + ands r7, r7, $0x01 + bne checkStatClkStop + + /* Check for DDR2 Controller Enable Completion */ +checkDDRStatClkStop: + ldr r6, MDSTAT_DDR2 + ldr r7, [r6] + and r7, r7, $0x1f + cmp r7, $0x03 + bne checkDDRStatClkStop + + /*------------------------------------------------------* + * Program DDR2 MMRs for 162MHz Setting * + *------------------------------------------------------*/ + + /* Program PHY Control Register */ + ldr r6, DDRCTL + ldr r7, DDRCTL_VAL + str r7, [r6] + + /* Program SDRAM Bank Config Register */ + ldr r6, SDCFG + ldr r7, SDCFG_VAL + str r7, [r6] + + /* Program SDRAM TIM-0 Config Register */ + ldr r6, SDTIM0 + ldr r7, SDTIM0_VAL_162MHz + str r7, [r6] + + /* Program SDRAM TIM-1 Config Register */ + ldr r6, SDTIM1 + ldr r7, SDTIM1_VAL_162MHz + str r7, [r6] + + /* Program the SDRAM Bank Config Control Register */ + ldr r10, MASK_VAL + ldr r8, SDCFG + ldr r9, SDCFG_VAL + and r9, r9, r10 + str r9, [r8] + + /* Program SDRAM SDREF Config Register */ + ldr r6, SDREF + ldr r7, SDREF_VAL + str r7, [r6] + + /*------------------------------------------------------* + * Issue Soft Reset to DDR Module * + *------------------------------------------------------*/ + + /* Issue a Dummy DDR2 read/write */ + ldr r8, DDR2_START_ADDR + ldr r7, DUMMY_VAL + str r7, [r8] + ldr r7, [r8] + + /* Shut down the DDR2 LPSC Module */ + ldr r8, PSC_FLAG_CLEAR + ldr r6, MDCTL_DDR2 + ldr r7, [r6] + and r7, r7, r8 + orr r7, r7, $0x01 + str r7, [r6] + + /* Enable the Power Domain Transition Command */ + ldr r6, PTCMD + ldr r7, [r6] + orr r7, r7, $0x01 + str r7, [r6] + + /* Check for Transition Complete(PTSTAT) */ +checkStatClkStop2: + ldr r6, PTSTAT + ldr r7, [r6] + ands r7, r7, $0x01 + bne checkStatClkStop2 + + /* Check for DDR2 Controller Enable Completion */ +checkDDRStatClkStop2: + ldr r6, MDSTAT_DDR2 + ldr r7, [r6] + and r7, r7, $0x1f + cmp r7, $0x01 + bne checkDDRStatClkStop2 + + /*------------------------------------------------------* + * Turn DDR2 Controller Clocks On * + *------------------------------------------------------*/ + + /* Enable the DDR2 LPSC Module */ + ldr r6, MDCTL_DDR2 + ldr r7, [r6] + orr r7, r7, $0x03 + str r7, [r6] + + /* Enable the Power Domain Transition Command */ + ldr r6, PTCMD + ldr r7, [r6] + orr r7, r7, $0x01 + str r7, [r6] + + /* Check for Transition Complete(PTSTAT) */ +checkStatClkEn2: + ldr r6, PTSTAT + ldr r7, [r6] + ands r7, r7, $0x01 + bne checkStatClkEn2 + + /* Check for DDR2 Controller Enable Completion */ +checkDDRStatClkEn2: + ldr r6, MDSTAT_DDR2 + ldr r7, [r6] + and r7, r7, $0x1f + cmp r7, $0x03 + bne checkDDRStatClkEn2 + + /* DDR Writes and Reads */ + ldr r6, CFGTEST + mov r3, $0x01 + str r3, [r6] + + /*------------------------------------------------------* + * System PLL Initialization * + *------------------------------------------------------*/ + + /* Select the Clock Mode Depending on the Value written in the Boot Table by the run script */ + mov r2, $0 + ldr r6, PLL1_CTL + ldr r7, PLL_CLKSRC_MASK + ldr r8, [r6] + and r8, r8, r7 + mov r9, r2, lsl $8 + orr r8, r8, r9 + str r8, [r6] + + /* Select the PLLEN source */ + ldr r7, PLL_ENSRC_MASK + and r8, r8, r7 + str r8, [r6] + + /* Bypass the PLL */ + ldr r7, PLL_BYPASS_MASK + and r8, r8, r7 + str r8, [r6] + + /* Wait for few cycles to allow PLLEN Mux switch properly to bypass Clock */ + mov r10, $0x20 + +WaitLoop: + subs r10, r10, $1 + bne WaitLoop + + /* Reset the PLL */ + ldr r7, PLL_RESET_MASK + and r8, r8, r7 + str r8, [r6] + + /* Disable the PLL */ + orr r8, r8, $0x10 + str r8, [r6] + + /* Power up the PLL */ + ldr r7, PLL_PWRUP_MASK + and r8, r8, r7 + str r8, [r6] + + /* Enable the PLL from Disable Mode */ + ldr r7, PLL_DISABLE_ENABLE_MASK + and r8, r8, r7 + str r8, [r6] + + /* Program the PLL Multiplier */ + ldr r6, PLL1_PLLM + mov r3, $0x15 /* For 594MHz */ + str r3, [r6] + + /* Wait for PLL to Reset Properly */ + mov r10, $0xff + +ResetLoop: + subs r10, r10, $1 + bne ResetLoop + + /* Bring PLL out of Reset */ + ldr r6, PLL1_CTL + orr r8, r8, $0x08 + str r8, [r6] + + /* Wait for PLL to Lock */ + ldr r10, PLL_LOCK_COUNT + +PLL1Lock: + subs r10, r10, $1 + bne PLL1Lock + + /* Enable the PLL */ + orr r8, r8, $0x01 + str r8, [r6] + + nop + nop + nop + nop + + /*------------------------------------------------------* + * AEMIF configuration for NOR Flash (double check) * + *------------------------------------------------------*/ + ldr r0, _PINMUX0 + ldr r1, _DEV_SETTING + str r1, [r0] + + ldr r0, WAITCFG + ldr r1, WAITCFG_VAL + ldr r2, [r0] + orr r2, r2, r1 + str r2, [r0] + + ldr r0, ACFG3 + ldr r1, ACFG3_VAL + ldr r2, [r0] + and r1, r2, r1 + str r1, [r0] + + ldr r0, ACFG4 + ldr r1, ACFG4_VAL + ldr r2, [r0] + and r1, r2, r1 + str r1, [r0] + + ldr r0, ACFG5 + ldr r1, ACFG5_VAL + ldr r2, [r0] + and r1, r2, r1 + str r1, [r0] + + /*--------------------------------------* + * VTP manual Calibration * + *--------------------------------------*/ + ldr r0, VTPIOCR + ldr r1, VTP_MMR0 + str r1, [r0] + + ldr r0, VTPIOCR + ldr r1, VTP_MMR1 + str r1, [r0] + + /* Wait for 33 VTP CLK cycles. VRP operates at 27 MHz */ + ldr r10, VTP_LOCK_COUNT +VTPLock: + subs r10, r10, $1 + bne VTPLock + + ldr r6, DFT_ENABLE + mov r10, $0x01 + str r10, [r6] + + ldr r6, DDRVTPR + ldr r7, [r6] + and r7, r7, $0x1f + and r8, r7, $0x3e0 + orr r8, r7, r8 + ldr r7, VTP_RECAL + orr r8, r7, r8 + ldr r7, VTP_EN + orr r8, r7, r8 + str r8, [r0] + + + /* Wait for 33 VTP CLK cycles. VRP operates at 27 MHz */ + ldr r10, VTP_LOCK_COUNT +VTP1Lock: + subs r10, r10, $1 + bne VTP1Lock + + ldr r1, [r0] + ldr r2, VTP_MASK + and r2, r1, r2 + str r2, [r0] + + ldr r6, DFT_ENABLE + mov r10, $0 + str r10, [r6] + + /* + * Call board-specific lowlevel init. + * That MUST be present and THAT returns + * back to arch calling code with "mov pc, lr." + */ + b dv_board_init + +.ltorg + +_PINMUX0: + .word 0x01c40000 /* Device Configuration Registers */ +_PINMUX1: + .word 0x01c40004 /* Device Configuration Registers */ + +_DEV_SETTING: + .word 0x00000c1f + +WAITCFG: + .word 0x01e00004 +WAITCFG_VAL: + .word 0 +ACFG3: + .word 0x01e00014 +ACFG3_VAL: + .word 0x3ffffffd +ACFG4: + .word 0x01e00018 +ACFG4_VAL: + .word 0x3ffffffd +ACFG5: + .word 0x01e0001c +ACFG5_VAL: + .word 0x3ffffffd + +MDCTL_DDR2: + .word 0x01c41a34 +MDSTAT_DDR2: + .word 0x01c41834 + +PTCMD: + .word 0x01c41120 +PTSTAT: + .word 0x01c41128 + +EINT_ENABLE0: + .word 0x01c48018 +EINT_ENABLE1: + .word 0x01c4801c + +PSC_FLAG_CLEAR: + .word 0xffffffe0 +PSC_GEM_FLAG_CLEAR: + .word 0xfffffeff + +/* DDR2 MMR & CONFIGURATION VALUES, 162 MHZ clock */ +DDRCTL: + .word 0x200000e4 +DDRCTL_VAL: + .word 0x50006405 +SDREF: + .word 0x2000000c +SDREF_VAL: + .word 0x000005c3 +SDCFG: + .word 0x20000008 +SDCFG_VAL: +#ifdef DDR_4BANKS + .word 0x00178622 +#elif defined DDR_8BANKS + .word 0x00178632 +#else +#error "Unknown DDR configuration!!!" +#endif +SDTIM0: + .word 0x20000010 +SDTIM0_VAL_162MHz: + .word 0x28923211 +SDTIM1: + .word 0x20000014 +SDTIM1_VAL_162MHz: + .word 0x0016c722 +VTPIOCR: + .word 0x200000f0 /* VTP IO Control register */ +DDRVTPR: + .word 0x01c42030 /* DDR VPTR MMR */ +VTP_MMR0: + .word 0x201f +VTP_MMR1: + .word 0xa01f +DFT_ENABLE: + .word 0x01c4004c +VTP_LOCK_COUNT: + .word 0x5b0 +VTP_MASK: + .word 0xffffdfff +VTP_RECAL: + .word 0x40000 +VTP_EN: + .word 0x02000 +CFGTEST: + .word 0x80010000 +MASK_VAL: + .word 0x00000fff + +/* GEM Power Up & LPSC Control Register */ +MDCTL_GEM: + .word 0x01c41a9c +MDSTAT_GEM: + .word 0x01c4189c + +/* For WDT reset chip bug */ +P1394: + .word 0x01c41a20 + +PLL_CLKSRC_MASK: + .word 0xfffffeff /* Mask the Clock Mode bit */ +PLL_ENSRC_MASK: + .word 0xffffffdf /* Select the PLLEN source */ +PLL_BYPASS_MASK: + .word 0xfffffffe /* Put the PLL in BYPASS */ +PLL_RESET_MASK: + .word 0xfffffff7 /* Put the PLL in Reset Mode */ +PLL_PWRUP_MASK: + .word 0xfffffffd /* PLL Power up Mask Bit */ +PLL_DISABLE_ENABLE_MASK: + .word 0xffffffef /* Enable the PLL from Disable */ +PLL_LOCK_COUNT: + .word 0x2000 + +/* PLL1-SYSTEM PLL MMRs */ +PLL1_CTL: + .word 0x01c40900 +PLL1_PLLM: + .word 0x01c40910 + +/* PLL2-SYSTEM PLL MMRs */ +PLL2_CTL: + .word 0x01c40d00 +PLL2_PLLM: + .word 0x01c40d10 +PLL2_DIV1: + .word 0x01c40d18 +PLL2_DIV2: + .word 0x01c40d1c +PLL2_PLLCMD: + .word 0x01c40d38 +PLL2_PLLSTAT: + .word 0x01c40d3c +PLL2_DIV_MASK: + .word 0xffff7fff + +MMARG_BRF0: + .word 0x01c42010 /* BRF margin mode 0 (R/W)*/ +MMARG_BRF0_VAL: + .word 0x00444400 + +DDR2_START_ADDR: + .word 0x80000000 +DUMMY_VAL: + .word 0xa55aa55a |