| Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
| trem | 0053e3c | 2013-09-10 22:08:39 +0200 | [diff] [blame] | 2 | /* |
| 3 | * (C) Copyright 2013 Philippe Reynes <tremyfr@yahoo.fr> |
| trem | 0053e3c | 2013-09-10 22:08:39 +0200 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <config.h> |
| 7 | #include <generated/asm-offsets.h> |
| trem | 0053e3c | 2013-09-10 22:08:39 +0200 | [diff] [blame] | 8 | #include <asm/macro.h> |
| 9 | #include <asm/arch/imx-regs.h> |
| 10 | #include "apf27.h" |
| 11 | |
| 12 | .macro init_aipi |
| 13 | /* |
| 14 | * setup AIPI1 and AIPI2 |
| 15 | */ |
| 16 | write32 AIPI1_PSR0, ACFG_AIPI1_PSR0_VAL |
| 17 | write32 AIPI1_PSR1, ACFG_AIPI1_PSR1_VAL |
| 18 | write32 AIPI2_PSR0, ACFG_AIPI2_PSR0_VAL |
| 19 | write32 AIPI2_PSR1, ACFG_AIPI2_PSR1_VAL |
| 20 | |
| 21 | /* Change SDRAM signal strengh */ |
| 22 | ldr r0, =GPCR |
| 23 | ldr r1, =ACFG_GPCR_VAL |
| 24 | ldr r5, [r0] |
| 25 | orr r5, r5, r1 |
| 26 | str r5, [r0] |
| 27 | |
| 28 | .endm /* init_aipi */ |
| 29 | |
| 30 | .macro init_clock |
| 31 | ldr r0, =CSCR |
| 32 | /* disable MPLL/SPLL first */ |
| 33 | ldr r1, [r0] |
| 34 | bic r1, r1, #(CSCR_MPEN|CSCR_SPEN) |
| 35 | str r1, [r0] |
| 36 | |
| 37 | /* |
| 38 | * pll clock initialization predefined in apf27.h |
| 39 | */ |
| 40 | write32 MPCTL0, ACFG_MPCTL0_VAL |
| 41 | write32 SPCTL0, ACFG_SPCTL0_VAL |
| 42 | |
| 43 | write32 CSCR, ACFG_CSCR_VAL|CSCR_MPLL_RESTART|CSCR_SPLL_RESTART |
| 44 | |
| 45 | /* |
| 46 | * add some delay here |
| 47 | */ |
| 48 | mov r1, #0x1000 |
| 49 | 1: subs r1, r1, #0x1 |
| 50 | bne 1b |
| 51 | |
| 52 | /* peripheral clock divider */ |
| 53 | write32 PCDR0, ACFG_PCDR0_VAL |
| 54 | write32 PCDR1, ACFG_PCDR1_VAL |
| 55 | |
| 56 | /* Configure PCCR0 and PCCR1 */ |
| 57 | write32 PCCR0, ACFG_PCCR0_VAL |
| 58 | write32 PCCR1, ACFG_PCCR1_VAL |
| 59 | |
| 60 | .endm /* init_clock */ |
| 61 | |
| 62 | .macro init_ddr |
| 63 | /* wait for SDRAM/LPDDR ready (SDRAMRDY) */ |
| 64 | ldr r0, =IMX_ESD_BASE |
| 65 | ldr r4, =ESDMISC_SDRAM_RDY |
| 66 | 2: ldr r1, [r0, #ESDMISC_ROF] |
| 67 | ands r1, r1, r4 |
| 68 | bpl 2b |
| 69 | |
| 70 | /* LPDDR Soft Reset Mobile/Low Power DDR SDRAM. */ |
| 71 | ldr r0, =IMX_ESD_BASE |
| 72 | ldr r4, =ACFG_ESDMISC_VAL |
| 73 | orr r1, r4, #ESDMISC_MDDR_DL_RST |
| 74 | str r1, [r0, #ESDMISC_ROF] |
| 75 | |
| 76 | /* Hold for more than 200ns */ |
| 77 | ldr r1, =0x10000 |
| 78 | 1: subs r1, r1, #0x1 |
| 79 | bne 1b |
| 80 | |
| 81 | str r4, [r0] |
| 82 | |
| 83 | ldr r0, =IMX_ESD_BASE |
| 84 | ldr r1, =ACFG_SDRAM_ESDCFG_REGISTER_VAL |
| 85 | str r1, [r0, #ESDCFG0_ROF] |
| 86 | |
| 87 | ldr r0, =IMX_ESD_BASE |
| 88 | ldr r1, =ACFG_PRECHARGE_CMD |
| 89 | str r1, [r0, #ESDCTL0_ROF] |
| 90 | |
| 91 | /* write8(0xA0001000, any value) */ |
| 92 | ldr r1, =PHYS_SDRAM_1+ACFG_SDRAM_PRECHARGE_ALL_VAL |
| 93 | strb r2, [r1] |
| 94 | |
| 95 | ldr r1, =ACFG_AUTOREFRESH_CMD |
| 96 | str r1, [r0, #ESDCTL0_ROF] |
| 97 | |
| 98 | ldr r4, =PHYS_SDRAM_1 /* CSD0 base address */ |
| 99 | |
| 100 | ldr r6,=0x7 /* load loop counter */ |
| 101 | 1: str r5,[r4] /* run auto-refresh cycle to array 0 */ |
| 102 | subs r6,r6,#1 |
| 103 | bne 1b |
| 104 | |
| 105 | ldr r1, =ACFG_SET_MODE_REG_CMD |
| 106 | str r1, [r0, #ESDCTL0_ROF] |
| 107 | |
| 108 | /* set standard mode register */ |
| 109 | ldr r4, = PHYS_SDRAM_1+ACFG_SDRAM_MODE_REGISTER_VAL |
| 110 | strb r2, [r4] |
| 111 | |
| 112 | /* set extended mode register */ |
| 113 | ldr r4, =PHYS_SDRAM_1+ACFG_SDRAM_EXT_MODE_REGISTER_VAL |
| 114 | strb r5, [r4] |
| 115 | |
| 116 | ldr r1, =ACFG_NORMAL_RW_CMD |
| 117 | str r1, [r0, #ESDCTL0_ROF] |
| 118 | |
| 119 | /* 2nd sdram */ |
| 120 | ldr r0, =IMX_ESD_BASE |
| 121 | ldr r1, =ACFG_SDRAM_ESDCFG_REGISTER_VAL |
| 122 | str r1, [r0, #ESDCFG1_ROF] |
| 123 | |
| 124 | ldr r0, =IMX_ESD_BASE |
| 125 | ldr r1, =ACFG_PRECHARGE_CMD |
| 126 | str r1, [r0, #ESDCTL1_ROF] |
| 127 | |
| 128 | /* write8(0xB0001000, any value) */ |
| 129 | ldr r1, =PHYS_SDRAM_2+ACFG_SDRAM_PRECHARGE_ALL_VAL |
| 130 | strb r2, [r1] |
| 131 | |
| 132 | ldr r1, =ACFG_AUTOREFRESH_CMD |
| 133 | str r1, [r0, #ESDCTL1_ROF] |
| 134 | |
| 135 | ldr r4, =PHYS_SDRAM_2 /* CSD1 base address */ |
| 136 | |
| 137 | ldr r6,=0x7 /* load loop counter */ |
| 138 | 1: str r5,[r4] /* run auto-refresh cycle to array 0 */ |
| 139 | subs r6,r6,#1 |
| 140 | bne 1b |
| 141 | |
| 142 | ldr r1, =ACFG_SET_MODE_REG_CMD |
| 143 | str r1, [r0, #ESDCTL1_ROF] |
| 144 | |
| 145 | /* set standard mode register */ |
| 146 | ldr r4, =PHYS_SDRAM_2+ACFG_SDRAM_MODE_REGISTER_VAL |
| 147 | strb r2, [r4] |
| 148 | |
| 149 | /* set extended mode register */ |
| 150 | ldr r4, =PHYS_SDRAM_2+ACFG_SDRAM_EXT_MODE_REGISTER_VAL |
| 151 | strb r2, [r4] |
| 152 | |
| 153 | ldr r1, =ACFG_NORMAL_RW_CMD |
| 154 | str r1, [r0, #ESDCTL1_ROF] |
| 155 | .endm /* init_ddr */ |
| 156 | |
| 157 | .globl lowlevel_init |
| 158 | lowlevel_init: |
| 159 | |
| 160 | init_aipi |
| 161 | init_clock |
| 162 | #ifdef CONFIG_SPL_BUILD |
| 163 | init_ddr |
| 164 | #endif |
| 165 | |
| 166 | mov pc, lr |