Gitiles
Code Review Sign In
gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 74cf05fc53fc620c9d08eb14ad959c2a065f90c7 / . / board / denx / m28evk / mem_init.c
blob: 17d1f9b6a1644d90ebea21f16919e90c2273fbe5 [file] [log] [blame]
Marek Vasut04fe4272011-11-08 23:18:21 +0000[diff] [blame]1/*
2 * Freescale i.MX28 RAM init
3 *
4 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
5 * on behalf of DENX Software Engineering GmbH
6 *
7 * See file CREDITS for list of people who contributed to this
8 * project.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23 * MA 02111-1307 USA
24 */
25
26#include <common.h>
27#include <config.h>
28#include <asm/io.h>
29#include <asm/arch/iomux-mx28.h>
30#include <asm/arch/imx-regs.h>
31
32#include "m28_init.h"
33
34uint32_t dram_vals[] = {
35 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
36 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
37 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
38 0x00000000, 0x00000000, 0x00000100, 0x00000000, 0x00000000,
39 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
40 0x00000000, 0x00010101, 0x01010101, 0x000f0f01, 0x0f02020a,
41 0x00000000, 0x00010101, 0x00000100, 0x00000100, 0x00000000,
42 0x00000002, 0x01010000, 0x05060302, 0x06005003, 0x0a0000c8,
43 0x02009c40, 0x0000030c, 0x0036a609, 0x031a0612, 0x02030202,
44 0x00c8001c, 0x00000000, 0x00000000, 0x00012100, 0xffff0303,
45 0x00012100, 0xffff0303, 0x00012100, 0xffff0303, 0x00012100,
46 0xffff0303, 0x00000003, 0x00000000, 0x00000000, 0x00000000,
47 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
48 0x00000000, 0x00000612, 0x01000F02, 0x06120612, 0x00000200,
49 0x00020007, 0xf5014b27, 0xf5014b27, 0xf5014b27, 0xf5014b27,
50 0x07000300, 0x07000300, 0x07000300, 0x07000300, 0x00000006,
51 0x00000000, 0x00000000, 0x01000000, 0x01020408, 0x08040201,
52 0x000f1133, 0x00000000, 0x00001f04, 0x00001f04, 0x00001f04,
53 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
54 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
55 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
56 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
57 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
58 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
59 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
60 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
61 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
62 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
63 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
64 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
65 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
66 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
67 0x00000000, 0x00000000, 0x00010000, 0x00020304, 0x00000004,
68 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
69 0x00000000, 0x01010000, 0x01000000, 0x03030000, 0x00010303,
70 0x01020202, 0x00000000, 0x02040303, 0x21002103, 0x00061200,
71 0x06120612, 0x04320432, 0x04320432, 0x00040004, 0x00040004,
72 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00010001
73};
74
75void init_m28_200mhz_ddr2(void)
76{
77 int i;
78
79 for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
80 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
81}
82
83void mx28_mem_init_clock(void)
84{
85 struct mx28_clkctrl_regs *clkctrl_regs =
86 (struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
87
88 /* Gate EMI clock */
89 writel(CLKCTRL_FRAC0_CLKGATEEMI,
90 &clkctrl_regs->hw_clkctrl_frac0_set);
91
92 /* EMI = 205MHz */
93 writel(CLKCTRL_FRAC0_EMIFRAC_MASK,
94 &clkctrl_regs->hw_clkctrl_frac0_set);
95 writel((0x2a << CLKCTRL_FRAC0_EMIFRAC_OFFSET) &
96 CLKCTRL_FRAC0_EMIFRAC_MASK,
97 &clkctrl_regs->hw_clkctrl_frac0_clr);
98
99 /* Ungate EMI clock */
100 writel(CLKCTRL_FRAC0_CLKGATEEMI,
101 &clkctrl_regs->hw_clkctrl_frac0_clr);
102
103 early_delay(11000);
104
105 writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
106 (1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
107 &clkctrl_regs->hw_clkctrl_emi);
108
109 /* Unbypass EMI */
110 writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
111 &clkctrl_regs->hw_clkctrl_clkseq_clr);
112
113 early_delay(10000);
114}
115
116void mx28_mem_setup_cpu_and_hbus(void)
117{
118 struct mx28_clkctrl_regs *clkctrl_regs =
119 (struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
120
121 /* CPU = 454MHz and ungate CPU clock */
122 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_frac0,
123 CLKCTRL_FRAC0_CPUFRAC_MASK | CLKCTRL_FRAC0_CLKGATECPU,
124 19 << CLKCTRL_FRAC0_CPUFRAC_OFFSET);
125
126 /* Set CPU bypass */
127 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
128 &clkctrl_regs->hw_clkctrl_clkseq_set);
129
130 /* HBUS = 151MHz */
131 writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
132 writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
133 &clkctrl_regs->hw_clkctrl_hbus_clr);
134
135 early_delay(10000);
136
137 /* CPU clock divider = 1 */
138 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
139 CLKCTRL_CPU_DIV_CPU_MASK, 1);
140
141 /* Disable CPU bypass */
142 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
143 &clkctrl_regs->hw_clkctrl_clkseq_clr);
144}
145
146void mx28_mem_setup_vdda(void)
147{
148 struct mx28_power_regs *power_regs =
149 (struct mx28_power_regs *)MXS_POWER_BASE;
150
151 writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
152 (0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
153 POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
154 &power_regs->hw_power_vddactrl);
155}
156
157void mx28_mem_setup_vddd(void)
158{
159 struct mx28_power_regs *power_regs =
160 (struct mx28_power_regs *)MXS_POWER_BASE;
161
162 writel((0x1c << POWER_VDDDCTRL_TRG_OFFSET) |
163 (0x7 << POWER_VDDDCTRL_BO_OFFSET_OFFSET) |
164 POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW,
165 &power_regs->hw_power_vdddctrl);
166}
167
Marek Vasut3a4ce832011-11-08 23:18:24 +0000[diff] [blame]168#define HW_DIGCTRL_SCRATCH0 0x8001c280
169#define HW_DIGCTRL_SCRATCH1 0x8001c290
170void data_abort_memdetect_handler(void) __attribute__((naked));
171void data_abort_memdetect_handler(void)
172{
173 asm volatile("subs pc, r14, #4");
174}
175
176void mx28_mem_get_size(void)
177{
178 uint32_t sz, da;
179 uint32_t *vt = (uint32_t *)0x20;
180
181 /* Replace the DABT handler. */
182 da = vt[4];
183 vt[4] = (uint32_t)&data_abort_memdetect_handler;
184
185 sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
186 writel(sz, HW_DIGCTRL_SCRATCH0);
187 writel(sz, HW_DIGCTRL_SCRATCH1);
188
189 /* Restore the old DABT handler. */
190 vt[4] = da;
191}
192
Marek Vasut04fe4272011-11-08 23:18:21 +0000[diff] [blame]193void mx28_mem_init(void)
194{
195 struct mx28_clkctrl_regs *clkctrl_regs =
196 (struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
197 struct mx28_pinctrl_regs *pinctrl_regs =
198 (struct mx28_pinctrl_regs *)MXS_PINCTRL_BASE;
199
200 /* Set DDR2 mode */
201 writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
202 &pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
203
204 /* Power up PLL0 */
205 writel(CLKCTRL_PLL0CTRL0_POWER,
206 &clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
207
208 early_delay(11000);
209
210 mx28_mem_init_clock();
211
212 mx28_mem_setup_vdda();
213
214 /*
215 * Configure the DRAM registers
216 */
217
218 /* Clear START bit from DRAM_CTL16 */
219 clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
220
221 init_m28_200mhz_ddr2();
222
223 /* Clear SREFRESH bit from DRAM_CTL17 */
224 clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
225
226 /* Set START bit in DRAM_CTL16 */
227 setbits_le32(MXS_DRAM_BASE + 0x40, 1);
228
229 /* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
230 while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
231 ;
232
233 mx28_mem_setup_vddd();
234
235 early_delay(10000);
236
237 mx28_mem_setup_cpu_and_hbus();
Marek Vasut3a4ce832011-11-08 23:18:24 +0000[diff] [blame]238
239 mx28_mem_get_size();
Marek Vasut04fe4272011-11-08 23:18:21 +0000[diff] [blame]240}