1 /*
2  * Copyright (C) 2014 Stefan Roese <sr@denx.de>
3  *
4  * Based on: gw_ventana_spl.c which is:
5  * Copyright (C) 2014 Gateworks Corporation
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <i2c.h>
12 #include <asm/io.h>
13 #include <asm/arch/iomux.h>
14 #include <asm/arch/mx6-ddr.h>
15 #include <asm/arch/mx6-pins.h>
16 #include <asm/arch/sys_proto.h>
17 #include <asm/imx-common/boot_mode.h>
18 #include <asm/imx-common/iomux-v3.h>
19 #include <asm/imx-common/mxc_i2c.h>
20 #include <spl.h>
21 
22 #include "platinum.h"
23 
24 DECLARE_GLOBAL_DATA_PTR;
25 
26 #undef RTT_NOM_120OHM	/* use 120ohm Rtt_nom vs 60ohm (lower power) */
27 
28 /* Configure MX6Q/DUAL mmdc DDR io registers */
29 struct mx6sdl_iomux_ddr_regs mx6sdl_ddr_ioregs = {
30 	/* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
31 	.dram_sdclk_0 = 0x00020030,
32 	.dram_sdclk_1 = 0x00020030,
33 	.dram_cas = 0x00020030,
34 	.dram_ras = 0x00020030,
35 	.dram_reset = 0x00020030,
36 	/* SDCKE[0:1]: 100k pull-up */
37 	.dram_sdcke0 = 0x00003000,
38 	.dram_sdcke1 = 0x00003000,
39 	/* SDBA2: pull-up disabled */
40 	.dram_sdba2 = 0x00000000,
41 	/* SDODT[0:1]: 100k pull-up, 40 ohm */
42 	.dram_sdodt0 = 0x00003030,
43 	.dram_sdodt1 = 0x00003030,
44 	/* SDQS[0:7]: Differential input, 40 ohm */
45 	.dram_sdqs0 = 0x00000030,
46 	.dram_sdqs1 = 0x00000030,
47 	.dram_sdqs2 = 0x00000030,
48 	.dram_sdqs3 = 0x00000030,
49 	.dram_sdqs4 = 0x00000030,
50 	.dram_sdqs5 = 0x00000030,
51 	.dram_sdqs6 = 0x00000030,
52 	.dram_sdqs7 = 0x00000030,
53 	/* DQM[0:7]: Differential input, 40 ohm */
54 	.dram_dqm0 = 0x00020030,
55 	.dram_dqm1 = 0x00020030,
56 	.dram_dqm2 = 0x00020030,
57 	.dram_dqm3 = 0x00020030,
58 	.dram_dqm4 = 0x00020030,
59 	.dram_dqm5 = 0x00020030,
60 	.dram_dqm6 = 0x00020030,
61 	.dram_dqm7 = 0x00020030,
62 };
63 
64 /* Configure MX6Q/DUAL mmdc GRP io registers */
65 struct mx6sdl_iomux_grp_regs mx6sdl_grp_ioregs = {
66 	/* DDR3 */
67 	.grp_ddr_type = 0x000c0000,
68 	.grp_ddrmode_ctl = 0x00020000,
69 	/* disable DDR pullups */
70 	.grp_ddrpke = 0x00000000,
71 	/* ADDR[00:16], SDBA[0:1]: 40 ohm */
72 	.grp_addds = 0x00000030,
73 	/* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
74 	.grp_ctlds = 0x00000030,
75 	/* DATA[00:63]: Differential input, 40 ohm */
76 	.grp_ddrmode = 0x00020000,
77 	.grp_b0ds = 0x00000030,
78 	.grp_b1ds = 0x00000030,
79 	.grp_b2ds = 0x00000030,
80 	.grp_b3ds = 0x00000030,
81 	.grp_b4ds = 0x00000030,
82 	.grp_b5ds = 0x00000030,
83 	.grp_b6ds = 0x00000030,
84 	.grp_b7ds = 0x00000030,
85 };
86 
87 /* MT41K256M16HA-125 */
88 static struct mx6_ddr3_cfg mt41k256m16ha_125 = {
89 	.mem_speed = 1600,
90 	.density = 4,		/* 4Gbit */
91 	.width = 16,
92 	.banks = 8,
93 	.rowaddr = 15,
94 	.coladdr = 10,
95 	.pagesz = 2,
96 	.trcd = 1375,
97 	.trcmin = 4875,
98 	.trasmin = 3500,
99 };
100 
101 /*
102  * Values from running the Freescale DDR stress tool via USB
103  */
104 static struct mx6_mmdc_calibration mx6dq_mmdc_calib = {
105 	/* write leveling calibration determine */
106 	.p0_mpwldectrl0 = 0x0044004E,
107 	.p0_mpwldectrl1 = 0x001F0023,
108 	/* Read DQS Gating calibration */
109 	.p0_mpdgctrl0 = 0x02480248,
110 	.p0_mpdgctrl1 = 0x0210021C,
111 	/* Read Calibration: DQS delay relative to DQ read access */
112 	.p0_mprddlctl = 0x42444444,
113 	/* Write Calibration: DQ/DM delay relative to DQS write access */
114 	.p0_mpwrdlctl = 0x36322C32,
115 };
116 
117 static void spl_dram_init(int width)
118 {
119 	struct mx6_ddr3_cfg *mem = &mt41k256m16ha_125;
120 	struct mx6_ddr_sysinfo sysinfo = {
121 		/* width of data bus:0=16,1=32,2=64 */
122 		.dsize = width / 32,
123 		/* config for full 4GB range so that get_mem_size() works */
124 		.cs_density = 32, /* 32Gb per CS */
125 		/* single chip select */
126 		.ncs = 1,
127 		.cs1_mirror = 1,
128 		.rtt_wr = 1 /*DDR3_RTT_60_OHM*/,	/* RTT_Wr = RZQ/4 */
129 #ifdef RTT_NOM_120OHM
130 		.rtt_nom = 2 /*DDR3_RTT_120_OHM*/,	/* RTT_Nom = RZQ/2 */
131 #else
132 		.rtt_nom = 1 /*DDR3_RTT_60_OHM*/,	/* RTT_Nom = RZQ/4 */
133 #endif
134 		.walat = 0,	/* Write additional latency */
135 		.ralat = 5,	/* Read additional latency */
136 		.mif3_mode = 3,	/* Command prediction working mode */
137 		.bi_on = 1,	/* Bank interleaving enabled */
138 		.sde_to_rst = 0x10,	/* 14 cycles, 200us (JEDEC default) */
139 		.rst_to_cke = 0x23,	/* 33 cycles, 500us (JEDEC default) */
140 		.ddr_type = DDR_TYPE_DDR3,
141 		.refsel = 1,	/* Refresh cycles at 32KHz */
142 		.refr = 7, 	/* 8 refresh commands per refresh cycle */
143 	};
144 
145 	mx6sdl_dram_iocfg(width, &mx6sdl_ddr_ioregs, &mx6sdl_grp_ioregs);
146 	mx6_dram_cfg(&sysinfo, &mx6dq_mmdc_calib, mem);
147 }
148 
149 /*
150  * Called from C runtime startup code (arch/arm/lib/crt0.S:_main)
151  * - we have a stack and a place to store GD, both in SRAM
152  * - no variable global data is available
153  */
154 void board_init_f(ulong dummy)
155 {
156 	/* Setup AIPS and disable watchdog */
157 	arch_cpu_init();
158 
159 	ccgr_init();
160 	gpr_init();
161 
162 	/* UART iomux */
163 	board_early_init_f();
164 
165 	/* Setup GP timer */
166 	timer_init();
167 
168 	/* UART clocks enabled and gd valid - init serial console */
169 	preloader_console_init();
170 
171 	/* Init DDR with 32bit width */
172 	spl_dram_init(32);
173 
174 	/* Clear the BSS */
175 	memset(__bss_start, 0, __bss_end - __bss_start);
176 
177 	/*
178 	 * Setup enet related MUXing early to give the PHY
179 	 * some time to wake-up from reset
180 	 */
181 	platinum_setup_enet();
182 
183 	/* load/boot image from boot device */
184 	board_init_r(NULL, 0);
185 }
186