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 * SPDX-License-Identifier: GPL-2.0+
13 #include <asm/arch/imx-regs.h>
14 #include <asm/arch/sys_proto.h>
15 #include <linux/compiler.h>
19 static uint32_t dram_vals[] = {
21 * i.MX28 DDR2 at 200MHz
23 #if defined(CONFIG_MX28)
24 0x00000000, 0x00000000, 0x00000000, 0x00000000,
25 0x00000000, 0x00000000, 0x00000000, 0x00000000,
26 0x00000000, 0x00000000, 0x00000000, 0x00000000,
27 0x00000000, 0x00000000, 0x00000000, 0x00000000,
28 0x00000000, 0x00000100, 0x00000000, 0x00000000,
29 0x00000000, 0x00000000, 0x00000000, 0x00000000,
30 0x00000000, 0x00000000, 0x00010101, 0x01010101,
31 0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101,
32 0x00000100, 0x00000100, 0x00000000, 0x00000002,
33 0x01010000, 0x07080403, 0x06005003, 0x0a0000c8,
34 0x02009c40, 0x0002030c, 0x0036a609, 0x031a0612,
35 0x02030202, 0x00c8001c, 0x00000000, 0x00000000,
36 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
37 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
38 0x00000003, 0x00000000, 0x00000000, 0x00000000,
39 0x00000000, 0x00000000, 0x00000000, 0x00000000,
40 0x00000000, 0x00000000, 0x00000612, 0x01000F02,
41 0x06120612, 0x00000200, 0x00020007, 0xf4004a27,
42 0xf4004a27, 0xf4004a27, 0xf4004a27, 0x07000300,
43 0x07000300, 0x07400300, 0x07400300, 0x00000005,
44 0x00000000, 0x00000000, 0x01000000, 0x01020408,
45 0x08040201, 0x000f1133, 0x00000000, 0x00001f04,
46 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
47 0x00001f04, 0x00001f04, 0x00001f04, 0x00000000,
48 0x00000000, 0x00000000, 0x00000000, 0x00000000,
49 0x00000000, 0x00000000, 0x00000000, 0x00000000,
50 0x00000000, 0x00000000, 0x00000000, 0x00000000,
51 0x00000000, 0x00000000, 0x00000000, 0x00000000,
52 0x00000000, 0x00000000, 0x00000000, 0x00000000,
53 0x00000000, 0x00000000, 0x00000000, 0x00000000,
54 0x00000000, 0x00000000, 0x00000000, 0x00000000,
55 0x00000000, 0x00000000, 0x00000000, 0x00000000,
56 0x00000000, 0x00000000, 0x00000000, 0x00000000,
57 0x00000000, 0x00000000, 0x00000000, 0x00000000,
58 0x00000000, 0x00000000, 0x00000000, 0x00000000,
59 0x00000000, 0x00000000, 0x00000000, 0x00000000,
60 0x00000000, 0x00000000, 0x00000000, 0x00000000,
61 0x00000000, 0x00000000, 0x00000000, 0x00000000,
62 0x00000000, 0x00000000, 0x00000000, 0x00000000,
63 0x00000000, 0x00000000, 0x00000000, 0x00000000,
64 0x00000000, 0x00000000, 0x00010000, 0x00030404,
65 0x00000003, 0x00000000, 0x00000000, 0x00000000,
66 0x00000000, 0x00000000, 0x00000000, 0x01010000,
67 0x01000000, 0x03030000, 0x00010303, 0x01020202,
68 0x00000000, 0x02040303, 0x21002103, 0x00061200,
69 0x06120612, 0x04420442, 0x04420442, 0x00040004,
70 0x00040004, 0x00000000, 0x00000000, 0x00000000,
71 0x00000000, 0xffffffff
74 * i.MX23 DDR at 133MHz
76 #elif defined(CONFIG_MX23)
77 0x01010001, 0x00010100, 0x01000101, 0x00000001,
78 0x00000101, 0x00000000, 0x00010000, 0x01000001,
79 0x00000000, 0x00000001, 0x07000200, 0x00070202,
80 0x02020000, 0x04040a01, 0x00000201, 0x02040000,
81 0x02000000, 0x19000f08, 0x0d0d0000, 0x02021313,
82 0x02061521, 0x0000000a, 0x00080008, 0x00200020,
83 0x00200020, 0x00200020, 0x000003f7, 0x00000000,
84 0x00000000, 0x00000020, 0x00000020, 0x00c80000,
85 0x000a23cd, 0x000000c8, 0x00006665, 0x00000000,
86 0x00000101, 0x00040001, 0x00000000, 0x00000000,
89 #error Unsupported memory initialization
93 __weak void mxs_adjust_memory_params(uint32_t *dram_vals)
98 static void initialize_dram_values(void)
102 mxs_adjust_memory_params(dram_vals);
104 for (i = 0; i < ARRAY_SIZE(dram_vals); i++)
105 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
108 static void initialize_dram_values(void)
112 mxs_adjust_memory_params(dram_vals);
115 * HW_DRAM_CTL27, HW_DRAM_CTL28 and HW_DRAM_CTL35 are not initialized as
116 * per FSL bootlets code.
118 * mx23 Reference Manual marks HW_DRAM_CTL27 and HW_DRAM_CTL28 as
120 * HW_DRAM_CTL8 is setup as the last element.
121 * So skip the initialization of these HW_DRAM_CTL registers.
123 for (i = 0; i < ARRAY_SIZE(dram_vals); i++) {
124 if (i == 8 || i == 27 || i == 28 || i == 35)
126 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i));
130 * Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last
133 writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
137 static void mxs_mem_init_clock(void)
139 struct mxs_clkctrl_regs *clkctrl_regs =
140 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
141 #if defined(CONFIG_MX23)
142 /* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
143 const unsigned char divider = 33;
144 #elif defined(CONFIG_MX28)
145 /* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
146 const unsigned char divider = 21;
150 writeb(CLKCTRL_FRAC_CLKGATE,
151 &clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
153 /* Set fractional divider for ref_emi */
154 writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
155 &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
157 /* Ungate EMI clock */
158 writeb(CLKCTRL_FRAC_CLKGATE,
159 &clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]);
163 /* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */
164 writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
165 (1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
166 &clkctrl_regs->hw_clkctrl_emi);
169 writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
170 &clkctrl_regs->hw_clkctrl_clkseq_clr);
175 static void mxs_mem_setup_cpu_and_hbus(void)
177 struct mxs_clkctrl_regs *clkctrl_regs =
178 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
180 /* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz
181 * and ungate CPU clock */
182 writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
183 (uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
186 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
187 &clkctrl_regs->hw_clkctrl_clkseq_set);
190 writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
191 writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
192 &clkctrl_regs->hw_clkctrl_hbus_clr);
196 /* CPU clock divider = 1 */
197 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
198 CLKCTRL_CPU_DIV_CPU_MASK, 1);
200 /* Disable CPU bypass */
201 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
202 &clkctrl_regs->hw_clkctrl_clkseq_clr);
207 static void mxs_mem_setup_vdda(void)
209 struct mxs_power_regs *power_regs =
210 (struct mxs_power_regs *)MXS_POWER_BASE;
212 writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
213 (0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
214 POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
215 &power_regs->hw_power_vddactrl);
218 uint32_t mxs_mem_get_size(void)
221 uint32_t *vt = (uint32_t *)0x20;
222 /* The following is "subs pc, r14, #4", used as return from DABT. */
223 const uint32_t data_abort_memdetect_handler = 0xe25ef004;
225 /* Replace the DABT handler. */
227 vt[4] = data_abort_memdetect_handler;
229 sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
231 /* Restore the old DABT handler. */
238 static void mx23_mem_setup_vddmem(void)
240 struct mxs_power_regs *power_regs =
241 (struct mxs_power_regs *)MXS_POWER_BASE;
243 /* We must wait before and after disabling the current limiter! */
246 clrbits_le32(&power_regs->hw_power_vddmemctrl,
247 POWER_VDDMEMCTRL_ENABLE_ILIMIT);
253 static void mx23_mem_init(void)
256 * Reset/ungate the EMI block. This is essential, otherwise the system
257 * suffers from memory instability. This thing is mx23 specific and is
258 * no longer present on mx28.
260 mxs_reset_block((struct mxs_register_32 *)MXS_EMI_BASE);
262 mx23_mem_setup_vddmem();
265 * Configure the DRAM registers
268 /* Clear START and SREFRESH bit from DRAM_CTL8 */
269 clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
271 initialize_dram_values();
273 /* Set START bit in DRAM_CTL8 */
274 setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
276 clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
278 /* Wait for EMI_STAT bit DRAM_HALTED */
280 if (!(readl(MXS_EMI_BASE + 0x10) & (1 << 1)))
285 /* Adjust EMI port priority. */
286 clrsetbits_le32(0x80020000, 0x1f << 16, 0x2);
289 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
290 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
295 static void mx28_mem_init(void)
297 struct mxs_pinctrl_regs *pinctrl_regs =
298 (struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
301 writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
302 &pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
305 * Configure the DRAM registers
308 /* Clear START bit from DRAM_CTL16 */
309 clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
311 initialize_dram_values();
313 /* Clear SREFRESH bit from DRAM_CTL17 */
314 clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
316 /* Set START bit in DRAM_CTL16 */
317 setbits_le32(MXS_DRAM_BASE + 0x40, 1);
319 /* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
320 while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
325 void mxs_mem_init(void)
329 mxs_mem_init_clock();
331 mxs_mem_setup_vdda();
333 #if defined(CONFIG_MX23)
335 #elif defined(CONFIG_MX28)
341 mxs_mem_setup_cpu_and_hbus();