diff options
Diffstat (limited to 'board/logicpd/imx27lite/lowlevel_init.S')
| -rw-r--r-- | board/logicpd/imx27lite/lowlevel_init.S | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/board/logicpd/imx27lite/lowlevel_init.S b/board/logicpd/imx27lite/lowlevel_init.S new file mode 100644 index 0000000..e2cdecb --- /dev/null +++ b/board/logicpd/imx27lite/lowlevel_init.S @@ -0,0 +1,170 @@ +/* + * For clock initialization, see chapter 3 of the "MCIMX27 Multimedia + * Applications Processor Reference Manual, Rev. 0.2". + * + * (C) Copyright 2008 Eric Jarrige <eric.jarrige@armadeus.org> + * (C) Copyright 2009 Ilya Yanok <yanok@emcraft.com> + * + * 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/macro.h> +#include <asm/arch/imx-regs.h> +#include <asm/arch/asm-offsets.h> + +SOC_ESDCTL_BASE_W: .word IMX_ESD_BASE +SOC_SI_ID_REG_W: .word IMX_SYSTEM_CTL_BASE +SDRAM_ESDCFG_T1_W: .word SDRAM_ESDCFG_REGISTER_VAL(0) +SDRAM_ESDCFG_T2_W: .word SDRAM_ESDCFG_REGISTER_VAL(3) +SDRAM_PRECHARGE_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_PRECHARGE | \ + ESDCTL_ROW13 | ESDCTL_COL10) +SDRAM_AUTOREF_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_AUTO_REF | \ + ESDCTL_ROW13 | ESDCTL_COL10) +SDRAM_LOADMODE_CMD_W: .word (ESDCTL_SDE | ESDCTL_SMODE_LOAD_MODE | \ + ESDCTL_ROW13 | ESDCTL_COL10) +SDRAM_NORMAL_CMD_W: .word SDRAM_ESDCTL_REGISTER_VAL + +.macro init_aipi + /* + * setup AIPI1 and AIPI2 + */ + write32 AIPI1_PSR0, AIPI1_PSR0_VAL + write32 AIPI1_PSR1, AIPI1_PSR1_VAL + write32 AIPI2_PSR0, AIPI2_PSR0_VAL + write32 AIPI2_PSR1, AIPI2_PSR1_VAL + +.endm /* init_aipi */ + +.macro init_clock + ldr r0, =CSCR + /* disable MPLL/SPLL first */ + ldr r1, [r0] + bic r1, r1, #(CSCR_MPEN|CSCR_SPEN) + str r1, [r0] + + write32 MPCTL0, MPCTL0_VAL + write32 SPCTL0, SPCTL0_VAL + + write32 CSCR, CSCR_VAL | CSCR_MPLL_RESTART | CSCR_SPLL_RESTART + + /* + * add some delay here + */ + wait_timer 0x1000 + + /* peripheral clock divider */ + write32 PCDR0, PCDR0_VAL + write32 PCDR1, PCDR1_VAL + + /* Configure PCCR0 and PCCR1 */ + write32 PCCR0, PCCR0_VAL + write32 PCCR1, PCCR1_VAL + +.endm /* init_clock */ + +.macro sdram_init + ldr r0, SOC_ESDCTL_BASE_W + mov r2, #PHYS_SDRAM_1 + + /* Do initial reset */ + mov r1, #ESDMISC_MDDR_DL_RST + str r1, [r0, #ESDMISC_ROF] + + /* Hold for more than 200ns */ + wait_timer 0x10000 + + /* Activate LPDDR iface */ + mov r1, #ESDMISC_MDDREN + str r1, [r0, #ESDMISC_ROF] + + /* Check The chip version TO1 or TO2 */ + ldr r1, SOC_SI_ID_REG_W + ldr r1, [r1] + ands r1, r1, #0xF0000000 + /* add Latency on CAS only for TO2 */ + ldreq r1, SDRAM_ESDCFG_T2_W + ldrne r1, SDRAM_ESDCFG_T1_W + str r1, [r0, #ESDCFG0_ROF] + + /* Run initialization sequence */ + ldr r1, SDRAM_PRECHARGE_CMD_W + str r1, [r0, #ESDCTL0_ROF] + ldr r1, [r2, #SDRAM_ALL_VAL] + + ldr r1, SDRAM_AUTOREF_CMD_W + str r1, [r0, #ESDCTL0_ROF] + ldr r1, [r2, #SDRAM_ALL_VAL] + ldr r1, [r2, #SDRAM_ALL_VAL] + + ldr r1, SDRAM_LOADMODE_CMD_W + str r1, [r0, #ESDCTL0_ROF] + ldrb r1, [r2, #SDRAM_MODE_REGISTER_VAL] + add r3, r2, #SDRAM_EXT_MODE_REGISTER_VAL + ldrb r1, [r3] + + ldr r1, SDRAM_NORMAL_CMD_W + str r1, [r0, #ESDCTL0_ROF] + +#if (CONFIG_NR_DRAM_BANKS > 1) + /* 2nd sdram */ + mov r2, #PHYS_SDRAM_2 + + /* Check The chip version TO1 or TO2 */ + ldr r1, SOC_SI_ID_REG_W + ldr r1, [r1] + ands r1, r1, #0xF0000000 + /* add Latency on CAS only for TO2 */ + ldreq r1, SDRAM_ESDCFG_T2_W + ldrne r1, SDRAM_ESDCFG_T1_W + str r1, [r0, #ESDCFG1_ROF] + + /* Run initialization sequence */ + ldr r1, SDRAM_PRECHARGE_CMD_W + str r1, [r0, #ESDCTL1_ROF] + ldr r1, [r2, #SDRAM_ALL_VAL] + + ldr r1, SDRAM_AUTOREF_CMD_W + str r1, [r0, #ESDCTL1_ROF] + ldr r1, [r2, #SDRAM_ALL_VAL] + ldr r1, [r2, #SDRAM_ALL_VAL] + + ldr r1, SDRAM_LOADMODE_CMD_W + str r1, [r0, #ESDCTL1_ROF] + ldrb r1, [r2, #SDRAM_MODE_REGISTER_VAL] + add r3, r2, #SDRAM_EXT_MODE_REGISTER_VAL + ldrb r1, [r3] + + ldr r1, SDRAM_NORMAL_CMD_W + str r1, [r0, #ESDCTL1_ROF] +#endif /* CONFIG_NR_DRAM_BANKS > 1 */ + +.endm /* sdram_init */ + +.globl lowlevel_init +lowlevel_init: + + mov r10, lr + + init_aipi + + init_clock + + sdram_init + + mov pc,r10 |