1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2014 Stefan Roese <sr (at) denx.de> 4 * 5 * Based on: gw_ventana_spl.c which is: 6 * Copyright (C) 2014 Gateworks Corporation 7 */ 8 9 #include <common.h> 10 #include <i2c.h> 11 #include <asm/io.h> 12 #include <asm/arch/iomux.h> 13 #include <asm/arch/mx6-ddr.h> 14 #include <asm/arch/mx6-pins.h> 15 #include <asm/arch/sys_proto.h> 16 #include <asm/mach-imx/boot_mode.h> 17 #include <asm/mach-imx/iomux-v3.h> 18 #include <asm/mach-imx/mxc_i2c.h> 19 #include <spl.h> 20 21 #include "platinum.h" 22 23 #undef RTT_NOM_120OHM /* use 120ohm Rtt_nom vs 60ohm (lower power) */ 24 25 /* Configure MX6Q/DUAL mmdc DDR io registers */ 26 struct mx6sdl_iomux_ddr_regs mx6sdl_ddr_ioregs = { 27 /* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */ 28 .dram_sdclk_0 = 0x00020030, 29 .dram_sdclk_1 = 0x00020030, 30 .dram_cas = 0x00020030, 31 .dram_ras = 0x00020030, 32 .dram_reset = 0x00020030, 33 /* SDCKE[0:1]: 100k pull-up */ 34 .dram_sdcke0 = 0x00003000, 35 .dram_sdcke1 = 0x00003000, 36 /* SDBA2: pull-up disabled */ 37 .dram_sdba2 = 0x00000000, 38 /* SDODT[0:1]: 100k pull-up, 40 ohm */ 39 .dram_sdodt0 = 0x00003030, 40 .dram_sdodt1 = 0x00003030, 41 /* SDQS[0:7]: Differential input, 40 ohm */ 42 .dram_sdqs0 = 0x00000030, 43 .dram_sdqs1 = 0x00000030, 44 .dram_sdqs2 = 0x00000030, 45 .dram_sdqs3 = 0x00000030, 46 .dram_sdqs4 = 0x00000030, 47 .dram_sdqs5 = 0x00000030, 48 .dram_sdqs6 = 0x00000030, 49 .dram_sdqs7 = 0x00000030, 50 /* DQM[0:7]: Differential input, 40 ohm */ 51 .dram_dqm0 = 0x00020030, 52 .dram_dqm1 = 0x00020030, 53 .dram_dqm2 = 0x00020030, 54 .dram_dqm3 = 0x00020030, 55 .dram_dqm4 = 0x00020030, 56 .dram_dqm5 = 0x00020030, 57 .dram_dqm6 = 0x00020030, 58 .dram_dqm7 = 0x00020030, 59 }; 60 61 /* Configure MX6Q/DUAL mmdc GRP io registers */ 62 struct mx6sdl_iomux_grp_regs mx6sdl_grp_ioregs = { 63 /* DDR3 */ 64 .grp_ddr_type = 0x000c0000, 65 .grp_ddrmode_ctl = 0x00020000, 66 /* disable DDR pullups */ 67 .grp_ddrpke = 0x00000000, 68 /* ADDR[00:16], SDBA[0:1]: 40 ohm */ 69 .grp_addds = 0x00000030, 70 /* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */ 71 .grp_ctlds = 0x00000030, 72 /* DATA[00:63]: Differential input, 40 ohm */ 73 .grp_ddrmode = 0x00020000, 74 .grp_b0ds = 0x00000030, 75 .grp_b1ds = 0x00000030, 76 .grp_b2ds = 0x00000030, 77 .grp_b3ds = 0x00000030, 78 .grp_b4ds = 0x00000030, 79 .grp_b5ds = 0x00000030, 80 .grp_b6ds = 0x00000030, 81 .grp_b7ds = 0x00000030, 82 }; 83 84 /* MT41K256M16HA-125 */ 85 static struct mx6_ddr3_cfg mt41k256m16ha_125 = { 86 .mem_speed = 1600, 87 .density = 4, /* 4Gbit */ 88 .width = 16, 89 .banks = 8, 90 .rowaddr = 15, 91 .coladdr = 10, 92 .pagesz = 2, 93 .trcd = 1375, 94 .trcmin = 4875, 95 .trasmin = 3500, 96 }; 97 98 /* 99 * Values from running the Freescale DDR stress tool via USB 100 */ 101 static struct mx6_mmdc_calibration mx6dq_mmdc_calib = { 102 /* write leveling calibration determine */ 103 .p0_mpwldectrl0 = 0x0044004E, 104 .p0_mpwldectrl1 = 0x001F0023, 105 /* Read DQS Gating calibration */ 106 .p0_mpdgctrl0 = 0x02480248, 107 .p0_mpdgctrl1 = 0x0210021C, 108 /* Read Calibration: DQS delay relative to DQ read access */ 109 .p0_mprddlctl = 0x42444444, 110 /* Write Calibration: DQ/DM delay relative to DQS write access */ 111 .p0_mpwrdlctl = 0x36322C32, 112 }; 113 114 static void spl_dram_init(int width) 115 { 116 struct mx6_ddr3_cfg *mem = &mt41k256m16ha_125; 117 struct mx6_ddr_sysinfo sysinfo = { 118 /* width of data bus:0=16,1=32,2=64 */ 119 .dsize = width / 32, 120 /* config for full 4GB range so that get_mem_size() works */ 121 .cs_density = 32, /* 32Gb per CS */ 122 /* single chip select */ 123 .ncs = 1, 124 .cs1_mirror = 1, 125 .rtt_wr = 1 /*DDR3_RTT_60_OHM*/, /* RTT_Wr = RZQ/4 */ 126 #ifdef RTT_NOM_120OHM 127 .rtt_nom = 2 /*DDR3_RTT_120_OHM*/, /* RTT_Nom = RZQ/2 */ 128 #else 129 .rtt_nom = 1 /*DDR3_RTT_60_OHM*/, /* RTT_Nom = RZQ/4 */ 130 #endif 131 .walat = 0, /* Write additional latency */ 132 .ralat = 5, /* Read additional latency */ 133 .mif3_mode = 3, /* Command prediction working mode */ 134 .bi_on = 1, /* Bank interleaving enabled */ 135 .sde_to_rst = 0x10, /* 14 cycles, 200us (JEDEC default) */ 136 .rst_to_cke = 0x23, /* 33 cycles, 500us (JEDEC default) */ 137 .ddr_type = DDR_TYPE_DDR3, 138 .refsel = 1, /* Refresh cycles at 32KHz */ 139 .refr = 7, /* 8 refresh commands per refresh cycle */ 140 }; 141 142 mx6sdl_dram_iocfg(width, &mx6sdl_ddr_ioregs, &mx6sdl_grp_ioregs); 143 mx6_dram_cfg(&sysinfo, &mx6dq_mmdc_calib, mem); 144 } 145 146 /* 147 * Called from C runtime startup code (arch/arm/lib/crt0.S:_main) 148 * - we have a stack and a place to store GD, both in SRAM 149 * - no variable global data is available 150 */ 151 void board_init_f(ulong dummy) 152 { 153 /* Setup AIPS and disable watchdog */ 154 arch_cpu_init(); 155 156 ccgr_init(); 157 gpr_init(); 158 159 /* UART iomux */ 160 board_early_init_f(); 161 162 /* Setup GP timer */ 163 timer_init(); 164 165 /* UART clocks enabled and gd valid - init serial console */ 166 preloader_console_init(); 167 168 /* Init DDR with 32bit width */ 169 spl_dram_init(32); 170 171 /* Clear the BSS */ 172 memset(__bss_start, 0, __bss_end - __bss_start); 173 174 /* 175 * Setup enet related MUXing early to give the PHY 176 * some time to wake-up from reset 177 */ 178 platinum_setup_enet(); 179 180 /* load/boot image from boot device */ 181 board_init_r(NULL, 0); 182 } 183
