2 * Freescale i.MX28 RAM init
4 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
5 * on behalf of DENX Software Engineering GmbH
7 * See file CREDITS for list of people who contributed to this
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.
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.
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,
29 #include <asm/arch/imx-regs.h>
30 #include <linux/compiler.h>
34 static uint32_t dram_vals[] = {
36 * i.MX28 DDR2 at 200MHz
38 #if defined(CONFIG_MX28)
39 0x00000000, 0x00000000, 0x00000000, 0x00000000,
40 0x00000000, 0x00000000, 0x00000000, 0x00000000,
41 0x00000000, 0x00000000, 0x00000000, 0x00000000,
42 0x00000000, 0x00000000, 0x00000000, 0x00000000,
43 0x00000000, 0x00000100, 0x00000000, 0x00000000,
44 0x00000000, 0x00000000, 0x00000000, 0x00000000,
45 0x00000000, 0x00000000, 0x00010101, 0x01010101,
46 0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101,
47 0x00000100, 0x00000100, 0x00000000, 0x00000002,
48 0x01010000, 0x05060302, 0x06005003, 0x0a0000c8,
49 0x02009c40, 0x0000030c, 0x0036a609, 0x031a0612,
50 0x02030202, 0x00c8001c, 0x00000000, 0x00000000,
51 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
52 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
53 0x00000003, 0x00000000, 0x00000000, 0x00000000,
54 0x00000000, 0x00000000, 0x00000000, 0x00000000,
55 0x00000000, 0x00000000, 0x00000612, 0x01000F02,
56 0x06120612, 0x00000200, 0x00020007, 0xf5014b27,
57 0xf5014b27, 0xf5014b27, 0xf5014b27, 0x07000300,
58 0x07000300, 0x07000300, 0x07000300, 0x00000006,
59 0x00000000, 0x00000000, 0x01000000, 0x01020408,
60 0x08040201, 0x000f1133, 0x00000000, 0x00001f04,
61 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
62 0x00001f04, 0x00001f04, 0x00001f04, 0x00000000,
63 0x00000000, 0x00000000, 0x00000000, 0x00000000,
64 0x00000000, 0x00000000, 0x00000000, 0x00000000,
65 0x00000000, 0x00000000, 0x00000000, 0x00000000,
66 0x00000000, 0x00000000, 0x00000000, 0x00000000,
67 0x00000000, 0x00000000, 0x00000000, 0x00000000,
68 0x00000000, 0x00000000, 0x00000000, 0x00000000,
69 0x00000000, 0x00000000, 0x00000000, 0x00000000,
70 0x00000000, 0x00000000, 0x00000000, 0x00000000,
71 0x00000000, 0x00000000, 0x00000000, 0x00000000,
72 0x00000000, 0x00000000, 0x00000000, 0x00000000,
73 0x00000000, 0x00000000, 0x00000000, 0x00000000,
74 0x00000000, 0x00000000, 0x00000000, 0x00000000,
75 0x00000000, 0x00000000, 0x00000000, 0x00000000,
76 0x00000000, 0x00000000, 0x00000000, 0x00000000,
77 0x00000000, 0x00000000, 0x00000000, 0x00000000,
78 0x00000000, 0x00000000, 0x00000000, 0x00000000,
79 0x00000000, 0x00000000, 0x00010000, 0x00020304,
80 0x00000004, 0x00000000, 0x00000000, 0x00000000,
81 0x00000000, 0x00000000, 0x00000000, 0x01010000,
82 0x01000000, 0x03030000, 0x00010303, 0x01020202,
83 0x00000000, 0x02040303, 0x21002103, 0x00061200,
84 0x06120612, 0x04320432, 0x04320432, 0x00040004,
85 0x00040004, 0x00000000, 0x00000000, 0x00000000,
86 0x00000000, 0x00010001
89 * i.MX23 DDR at 133MHz
91 #elif defined(CONFIG_MX23)
92 0x01010001, 0x00010100, 0x01000101, 0x00000001,
93 0x00000101, 0x00000000, 0x00010000, 0x01000001,
94 0x00000000, 0x00000001, 0x07000200, 0x00070202,
95 0x02020000, 0x04040a01, 0x00000201, 0x02040000,
96 0x02000000, 0x19000f08, 0x0d0d0000, 0x02021313,
97 0x02061521, 0x0000000a, 0x00080008, 0x00200020,
98 0x00200020, 0x00200020, 0x000003f7, 0x00000000,
99 0x00000000, 0x00000020, 0x00000020, 0x00c80000,
100 0x000a23cd, 0x000000c8, 0x00006665, 0x00000000,
101 0x00000101, 0x00040001, 0x00000000, 0x00000000,
104 #error Unsupported memory initialization
108 __weak void mxs_adjust_memory_params(uint32_t *dram_vals)
112 static void initialize_dram_values(void)
116 mxs_adjust_memory_params(dram_vals);
118 for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
119 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
122 writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
126 static void mxs_mem_init_clock(void)
128 struct mxs_clkctrl_regs *clkctrl_regs =
129 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
130 #if defined(CONFIG_MX23)
131 /* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
132 const unsigned char divider = 33;
133 #elif defined(CONFIG_MX28)
134 /* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
135 const unsigned char divider = 21;
139 writeb(CLKCTRL_FRAC_CLKGATE,
140 &clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
142 /* Set fractional divider for ref_emi */
143 writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
144 &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
146 /* Ungate EMI clock */
147 writeb(CLKCTRL_FRAC_CLKGATE,
148 &clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]);
152 /* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */
153 writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
154 (1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
155 &clkctrl_regs->hw_clkctrl_emi);
158 writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
159 &clkctrl_regs->hw_clkctrl_clkseq_clr);
164 static void mxs_mem_setup_cpu_and_hbus(void)
166 struct mxs_clkctrl_regs *clkctrl_regs =
167 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
169 /* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz
170 * and ungate CPU clock */
171 writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
172 (uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
175 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
176 &clkctrl_regs->hw_clkctrl_clkseq_set);
179 writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
180 writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
181 &clkctrl_regs->hw_clkctrl_hbus_clr);
185 /* CPU clock divider = 1 */
186 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
187 CLKCTRL_CPU_DIV_CPU_MASK, 1);
189 /* Disable CPU bypass */
190 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
191 &clkctrl_regs->hw_clkctrl_clkseq_clr);
196 static void mxs_mem_setup_vdda(void)
198 struct mxs_power_regs *power_regs =
199 (struct mxs_power_regs *)MXS_POWER_BASE;
201 writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
202 (0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
203 POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
204 &power_regs->hw_power_vddactrl);
207 uint32_t mxs_mem_get_size(void)
210 uint32_t *vt = (uint32_t *)0x20;
211 /* The following is "subs pc, r14, #4", used as return from DABT. */
212 const uint32_t data_abort_memdetect_handler = 0xe25ef004;
214 /* Replace the DABT handler. */
216 vt[4] = data_abort_memdetect_handler;
218 sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
220 /* Restore the old DABT handler. */
227 static void mx23_mem_setup_vddmem(void)
229 struct mxs_power_regs *power_regs =
230 (struct mxs_power_regs *)MXS_POWER_BASE;
232 writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) |
233 POWER_VDDMEMCTRL_ENABLE_ILIMIT |
234 POWER_VDDMEMCTRL_ENABLE_LINREG |
235 POWER_VDDMEMCTRL_PULLDOWN_ACTIVE,
236 &power_regs->hw_power_vddmemctrl);
240 writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) |
241 POWER_VDDMEMCTRL_ENABLE_LINREG,
242 &power_regs->hw_power_vddmemctrl);
245 static void mx23_mem_init(void)
247 mx23_mem_setup_vddmem();
250 * Configure the DRAM registers
253 /* Clear START and SREFRESH bit from DRAM_CTL8 */
254 clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
256 initialize_dram_values();
258 /* Set START bit in DRAM_CTL16 */
259 setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
261 clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
264 /* Adjust EMI port priority. */
265 clrsetbits_le32(0x80020000, 0x1f << 16, 0x8);
268 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
269 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
271 /* Wait for bit 10 (DRAM init complete) in DRAM_CTL18 */
272 while (!(readl(MXS_DRAM_BASE + 0x48) & (1 << 10)))
278 static void mx28_mem_init(void)
280 struct mxs_pinctrl_regs *pinctrl_regs =
281 (struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
284 writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
285 &pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
288 * Configure the DRAM registers
291 /* Clear START bit from DRAM_CTL16 */
292 clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
294 initialize_dram_values();
296 /* Clear SREFRESH bit from DRAM_CTL17 */
297 clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
299 /* Set START bit in DRAM_CTL16 */
300 setbits_le32(MXS_DRAM_BASE + 0x40, 1);
302 /* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
303 while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
308 void mxs_mem_init(void)
312 mxs_mem_init_clock();
314 mxs_mem_setup_vdda();
316 #if defined(CONFIG_MX23)
318 #elif defined(CONFIG_MX28)
324 mxs_mem_setup_cpu_and_hbus();