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>
33 static uint32_t dram_vals[] = {
35 * i.MX28 DDR2 at 200MHz
37 #if defined(CONFIG_MX28)
38 0x00000000, 0x00000000, 0x00000000, 0x00000000,
39 0x00000000, 0x00000000, 0x00000000, 0x00000000,
40 0x00000000, 0x00000000, 0x00000000, 0x00000000,
41 0x00000000, 0x00000000, 0x00000000, 0x00000000,
42 0x00000000, 0x00000100, 0x00000000, 0x00000000,
43 0x00000000, 0x00000000, 0x00000000, 0x00000000,
44 0x00000000, 0x00000000, 0x00010101, 0x01010101,
45 0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101,
46 0x00000100, 0x00000100, 0x00000000, 0x00000002,
47 0x01010000, 0x05060302, 0x06005003, 0x0a0000c8,
48 0x02009c40, 0x0000030c, 0x0036a609, 0x031a0612,
49 0x02030202, 0x00c8001c, 0x00000000, 0x00000000,
50 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
51 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
52 0x00000003, 0x00000000, 0x00000000, 0x00000000,
53 0x00000000, 0x00000000, 0x00000000, 0x00000000,
54 0x00000000, 0x00000000, 0x00000612, 0x01000F02,
55 0x06120612, 0x00000200, 0x00020007, 0xf5014b27,
56 0xf5014b27, 0xf5014b27, 0xf5014b27, 0x07000300,
57 0x07000300, 0x07000300, 0x07000300, 0x00000006,
58 0x00000000, 0x00000000, 0x01000000, 0x01020408,
59 0x08040201, 0x000f1133, 0x00000000, 0x00001f04,
60 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
61 0x00001f04, 0x00001f04, 0x00001f04, 0x00000000,
62 0x00000000, 0x00000000, 0x00000000, 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, 0x00010000, 0x00020304,
79 0x00000004, 0x00000000, 0x00000000, 0x00000000,
80 0x00000000, 0x00000000, 0x00000000, 0x01010000,
81 0x01000000, 0x03030000, 0x00010303, 0x01020202,
82 0x00000000, 0x02040303, 0x21002103, 0x00061200,
83 0x06120612, 0x04320432, 0x04320432, 0x00040004,
84 0x00040004, 0x00000000, 0x00000000, 0x00000000,
85 0x00000000, 0x00010001
88 * i.MX23 DDR at 133MHz
90 #elif defined(CONFIG_MX23)
91 0x01010001, 0x00010100, 0x01000101, 0x00000001,
92 0x00000101, 0x00000000, 0x00010000, 0x01000001,
93 0x00000000, 0x00000001, 0x07000200, 0x00070202,
94 0x02020000, 0x04040a01, 0x00000201, 0x02040000,
95 0x02000000, 0x19000f08, 0x0d0d0000, 0x02021313,
96 0x02061521, 0x0000000a, 0x00080008, 0x00200020,
97 0x00200020, 0x00200020, 0x000003f7, 0x00000000,
98 0x00000000, 0x00000020, 0x00000020, 0x00c80000,
99 0x000a23cd, 0x000000c8, 0x00006665, 0x00000000,
100 0x00000101, 0x00040001, 0x00000000, 0x00000000,
103 #error Unsupported memory initialization
107 void __mxs_adjust_memory_params(uint32_t *dram_vals)
110 void mxs_adjust_memory_params(uint32_t *dram_vals)
111 __attribute__((weak, alias("__mxs_adjust_memory_params")));
113 static void initialize_dram_values(void)
117 mxs_adjust_memory_params(dram_vals);
119 for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
120 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
123 writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
127 static void mxs_mem_init_clock(void)
129 struct mxs_clkctrl_regs *clkctrl_regs =
130 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
131 #if defined(CONFIG_MX23)
132 /* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
133 const unsigned char divider = 33;
134 #elif defined(CONFIG_MX28)
135 /* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
136 const unsigned char divider = 21;
140 writeb(CLKCTRL_FRAC_CLKGATE,
141 &clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
143 /* Set fractional divider for ref_emi */
144 writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
145 &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
147 /* Ungate EMI clock */
148 writeb(CLKCTRL_FRAC_CLKGATE,
149 &clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]);
153 /* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */
154 writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
155 (1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
156 &clkctrl_regs->hw_clkctrl_emi);
159 writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
160 &clkctrl_regs->hw_clkctrl_clkseq_clr);
165 static void mxs_mem_setup_cpu_and_hbus(void)
167 struct mxs_clkctrl_regs *clkctrl_regs =
168 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
170 /* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz
171 * and ungate CPU clock */
172 writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
173 (uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
176 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
177 &clkctrl_regs->hw_clkctrl_clkseq_set);
180 writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
181 writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
182 &clkctrl_regs->hw_clkctrl_hbus_clr);
186 /* CPU clock divider = 1 */
187 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
188 CLKCTRL_CPU_DIV_CPU_MASK, 1);
190 /* Disable CPU bypass */
191 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
192 &clkctrl_regs->hw_clkctrl_clkseq_clr);
197 static void mxs_mem_setup_vdda(void)
199 struct mxs_power_regs *power_regs =
200 (struct mxs_power_regs *)MXS_POWER_BASE;
202 writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
203 (0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
204 POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
205 &power_regs->hw_power_vddactrl);
208 uint32_t mxs_mem_get_size(void)
211 uint32_t *vt = (uint32_t *)0x20;
212 /* The following is "subs pc, r14, #4", used as return from DABT. */
213 const uint32_t data_abort_memdetect_handler = 0xe25ef004;
215 /* Replace the DABT handler. */
217 vt[4] = data_abort_memdetect_handler;
219 sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
221 /* Restore the old DABT handler. */
228 static void mx23_mem_setup_vddmem(void)
230 struct mxs_power_regs *power_regs =
231 (struct mxs_power_regs *)MXS_POWER_BASE;
233 writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) |
234 POWER_VDDMEMCTRL_ENABLE_ILIMIT |
235 POWER_VDDMEMCTRL_ENABLE_LINREG |
236 POWER_VDDMEMCTRL_PULLDOWN_ACTIVE,
237 &power_regs->hw_power_vddmemctrl);
241 writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) |
242 POWER_VDDMEMCTRL_ENABLE_LINREG,
243 &power_regs->hw_power_vddmemctrl);
246 static void mx23_mem_init(void)
248 mx23_mem_setup_vddmem();
251 * Configure the DRAM registers
254 /* Clear START and SREFRESH bit from DRAM_CTL8 */
255 clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
257 initialize_dram_values();
259 /* Set START bit in DRAM_CTL16 */
260 setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
262 clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
265 /* Adjust EMI port priority. */
266 clrsetbits_le32(0x80020000, 0x1f << 16, 0x8);
269 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
270 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
272 /* Wait for bit 10 (DRAM init complete) in DRAM_CTL18 */
273 while (!(readl(MXS_DRAM_BASE + 0x48) & (1 << 10)))
279 static void mx28_mem_init(void)
281 struct mxs_pinctrl_regs *pinctrl_regs =
282 (struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
285 writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
286 &pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
289 * Configure the DRAM registers
292 /* Clear START bit from DRAM_CTL16 */
293 clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
295 initialize_dram_values();
297 /* Clear SREFRESH bit from DRAM_CTL17 */
298 clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
300 /* Set START bit in DRAM_CTL16 */
301 setbits_le32(MXS_DRAM_BASE + 0x40, 1);
303 /* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
304 while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
309 void mxs_mem_init(void)
313 mxs_mem_init_clock();
315 mxs_mem_setup_vdda();
317 #if defined(CONFIG_MX23)
319 #elif defined(CONFIG_MX28)
325 mxs_mem_setup_cpu_and_hbus();