1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Freescale i.MX28 RAM init
4 *
5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
6 * on behalf of DENX Software Engineering GmbH
7 */
8
9 #include <common.h>
10 #include <config.h>
11 #include <asm/io.h>
12 #include <asm/arch/imx-regs.h>
13 #include <asm/arch/sys_proto.h>
14 #include <linux/compiler.h>
15
16 #include "mxs_init.h"
17
18 __weak uint32_t mxs_dram_vals[] = {
19 /*
20 * i.MX28 DDR2 at 200MHz
21 */
22 #if defined(CONFIG_MX28)
23 0x00000000, 0x00000000, 0x00000000, 0x00000000,
24 0x00000000, 0x00000000, 0x00000000, 0x00000000,
25 0x00000000, 0x00000000, 0x00000000, 0x00000000,
26 0x00000000, 0x00000000, 0x00000000, 0x00000000,
27 0x00000000, 0x00000100, 0x00000000, 0x00000000,
28 0x00000000, 0x00000000, 0x00000000, 0x00000000,
29 0x00000000, 0x00000000, 0x00010101, 0x01010101,
30 0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101,
31 0x00000100, 0x00000100, 0x00000000, 0x00000002,
32 0x01010000, 0x07080403, 0x06005003, 0x0a0000c8,
33 0x02009c40, 0x0002030c, 0x0036a609, 0x031a0612,
34 0x02030202, 0x00c8001c, 0x00000000, 0x00000000,
35 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
36 0x00012100, 0xffff0303, 0x00012100, 0xffff0303,
37 0x00000003, 0x00000000, 0x00000000, 0x00000000,
38 0x00000000, 0x00000000, 0x00000000, 0x00000000,
39 0x00000000, 0x00000000, 0x00000612, 0x01000F02,
40 0x06120612, 0x00000200, 0x00020007, 0xf4004a27,
41 0xf4004a27, 0xf4004a27, 0xf4004a27, 0x07000300,
42 0x07000300, 0x07400300, 0x07400300, 0x00000005,
43 0x00000000, 0x00000000, 0x01000000, 0x01020408,
44 0x08040201, 0x000f1133, 0x00000000, 0x00001f04,
45 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04,
46 0x00001f04, 0x00001f04, 0x00001f04, 0x00000000,
47 0x00000000, 0x00000000, 0x00000000, 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, 0x00010000, 0x00030404,
64 0x00000003, 0x00000000, 0x00000000, 0x00000000,
65 0x00000000, 0x00000000, 0x00000000, 0x01010000,
66 0x01000000, 0x03030000, 0x00010303, 0x01020202,
67 0x00000000, 0x02040303, 0x21002103, 0x00061200,
68 0x06120612, 0x04420442, 0x04420442, 0x00040004,
69 0x00040004, 0x00000000, 0x00000000, 0x00000000,
70 0x00000000, 0xffffffff
71
72 /*
73 * i.MX23 DDR at 133MHz
74 */
75 #elif defined(CONFIG_MX23)
76 0x01010001, 0x00010100, 0x01000101, 0x00000001,
77 0x00000101, 0x00000000, 0x00010000, 0x01000001,
78 0x00000000, 0x00000001, 0x07000200, 0x00070202,
79 0x02020000, 0x04040a01, 0x00000201, 0x02040000,
80 0x02000000, 0x19000f08, 0x0d0d0000, 0x02021313,
81 0x02061521, 0x0000000a, 0x00080008, 0x00200020,
82 0x00200020, 0x00200020, 0x000003f7, 0x00000000,
83 0x00000000, 0x00000020, 0x00000020, 0x00c80000,
84 0x000a23cd, 0x000000c8, 0x00006665, 0x00000000,
85 0x00000101, 0x00040001, 0x00000000, 0x00000000,
86 0x00010000
87 #else
88 #error Unsupported memory initialization
89 #endif
90 };
91
mxs_adjust_memory_params(uint32_t * dram_vals)92 __weak void mxs_adjust_memory_params(uint32_t *dram_vals)
93 {
94 debug("SPL: Using default SDRAM parameters\n");
95 }
96
97 #ifdef CONFIG_MX28
initialize_dram_values(void)98 static void initialize_dram_values(void)
99 {
100 int i;
101
102 debug("SPL: Setting mx28 board specific SDRAM parameters\n");
103 mxs_adjust_memory_params(mxs_dram_vals);
104
105 debug("SPL: Applying SDRAM parameters\n");
106 for (i = 0; i < ARRAY_SIZE(mxs_dram_vals); i++)
107 writel(mxs_dram_vals[i], MXS_DRAM_BASE + (4 * i));
108 }
109 #else
initialize_dram_values(void)110 static void initialize_dram_values(void)
111 {
112 int i;
113
114 debug("SPL: Setting mx23 board specific SDRAM parameters\n");
115 mxs_adjust_memory_params(mxs_dram_vals);
116
117 /*
118 * HW_DRAM_CTL27, HW_DRAM_CTL28 and HW_DRAM_CTL35 are not initialized as
119 * per FSL bootlets code.
120 *
121 * mx23 Reference Manual marks HW_DRAM_CTL27 and HW_DRAM_CTL28 as
122 * "reserved".
123 * HW_DRAM_CTL8 is setup as the last element.
124 * So skip the initialization of these HW_DRAM_CTL registers.
125 */
126 debug("SPL: Applying SDRAM parameters\n");
127 for (i = 0; i < ARRAY_SIZE(mxs_dram_vals); i++) {
128 if (i == 8 || i == 27 || i == 28 || i == 35)
129 continue;
130 writel(mxs_dram_vals[i], MXS_DRAM_BASE + (4 * i));
131 }
132
133 /*
134 * Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last
135 * element to be set
136 */
137 writel((1 << 24), MXS_DRAM_BASE + (4 * 8));
138 }
139 #endif
140
mxs_mem_init_clock(void)141 static void mxs_mem_init_clock(void)
142 {
143 struct mxs_clkctrl_regs *clkctrl_regs =
144 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
145 #if defined(CONFIG_MX23)
146 /* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */
147 const unsigned char divider = 33;
148 #elif defined(CONFIG_MX28)
149 /* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */
150 const unsigned char divider = 21;
151 #endif
152
153 debug("SPL: Initialising FRAC0\n");
154
155 /* Gate EMI clock */
156 writeb(CLKCTRL_FRAC_CLKGATE,
157 &clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]);
158
159 /* Set fractional divider for ref_emi */
160 writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK),
161 &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]);
162
163 /* Ungate EMI clock */
164 writeb(CLKCTRL_FRAC_CLKGATE,
165 &clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]);
166
167 early_delay(11000);
168
169 /* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */
170 writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) |
171 (1 << CLKCTRL_EMI_DIV_XTAL_OFFSET),
172 &clkctrl_regs->hw_clkctrl_emi);
173
174 /* Unbypass EMI */
175 writel(CLKCTRL_CLKSEQ_BYPASS_EMI,
176 &clkctrl_regs->hw_clkctrl_clkseq_clr);
177
178 early_delay(10000);
179 debug("SPL: FRAC0 Initialised\n");
180 }
181
mxs_mem_setup_cpu_and_hbus(void)182 static void mxs_mem_setup_cpu_and_hbus(void)
183 {
184 struct mxs_clkctrl_regs *clkctrl_regs =
185 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
186
187 debug("SPL: Setting CPU and HBUS clock frequencies\n");
188
189 /* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz
190 * and ungate CPU clock */
191 writeb(19 & CLKCTRL_FRAC_FRAC_MASK,
192 (uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]);
193
194 /* Set CPU bypass */
195 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
196 &clkctrl_regs->hw_clkctrl_clkseq_set);
197
198 /* HBUS = 151MHz */
199 writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set);
200 writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK,
201 &clkctrl_regs->hw_clkctrl_hbus_clr);
202
203 early_delay(10000);
204
205 /* CPU clock divider = 1 */
206 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu,
207 CLKCTRL_CPU_DIV_CPU_MASK, 1);
208
209 /* Disable CPU bypass */
210 writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
211 &clkctrl_regs->hw_clkctrl_clkseq_clr);
212
213 early_delay(15000);
214 }
215
mxs_mem_setup_vdda(void)216 static void mxs_mem_setup_vdda(void)
217 {
218 struct mxs_power_regs *power_regs =
219 (struct mxs_power_regs *)MXS_POWER_BASE;
220
221 debug("SPL: Configuring VDDA\n");
222
223 writel((0xc << POWER_VDDACTRL_TRG_OFFSET) |
224 (0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) |
225 POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW,
226 &power_regs->hw_power_vddactrl);
227 }
228
mxs_mem_get_size(void)229 uint32_t mxs_mem_get_size(void)
230 {
231 uint32_t sz, da;
232 uint32_t *vt = (uint32_t *)0x20;
233 /* The following is "subs pc, r14, #4", used as return from DABT. */
234 const uint32_t data_abort_memdetect_handler = 0xe25ef004;
235
236 /* Replace the DABT handler. */
237 da = vt[4];
238 vt[4] = data_abort_memdetect_handler;
239
240 sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
241
242 /* Restore the old DABT handler. */
243 vt[4] = da;
244
245 return sz;
246 }
247
248 #ifdef CONFIG_MX23
mx23_mem_setup_vddmem(void)249 static void mx23_mem_setup_vddmem(void)
250 {
251 struct mxs_power_regs *power_regs =
252 (struct mxs_power_regs *)MXS_POWER_BASE;
253
254 debug("SPL: Setting mx23 VDDMEM\n");
255
256 /* We must wait before and after disabling the current limiter! */
257 early_delay(10000);
258
259 clrbits_le32(&power_regs->hw_power_vddmemctrl,
260 POWER_VDDMEMCTRL_ENABLE_ILIMIT);
261
262 early_delay(10000);
263
264 }
265
mx23_mem_init(void)266 static void mx23_mem_init(void)
267 {
268 debug("SPL: Initialising mx23 SDRAM Controller\n");
269
270 /*
271 * Reset/ungate the EMI block. This is essential, otherwise the system
272 * suffers from memory instability. This thing is mx23 specific and is
273 * no longer present on mx28.
274 */
275 mxs_reset_block((struct mxs_register_32 *)MXS_EMI_BASE);
276
277 mx23_mem_setup_vddmem();
278
279 /*
280 * Configure the DRAM registers
281 */
282
283 /* Clear START and SREFRESH bit from DRAM_CTL8 */
284 clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8));
285
286 initialize_dram_values();
287
288 /* Set START bit in DRAM_CTL8 */
289 setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16);
290
291 clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17);
292
293 /* Wait for EMI_STAT bit DRAM_HALTED */
294 for (;;) {
295 if (!(readl(MXS_EMI_BASE + 0x10) & (1 << 1)))
296 break;
297 early_delay(1000);
298 }
299
300 /* Adjust EMI port priority. */
301 clrsetbits_le32(0x80020000, 0x1f << 16, 0x2);
302 early_delay(20000);
303
304 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19);
305 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11);
306 }
307 #endif
308
309 #ifdef CONFIG_MX28
mx28_mem_init(void)310 static void mx28_mem_init(void)
311 {
312 struct mxs_pinctrl_regs *pinctrl_regs =
313 (struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE;
314
315 debug("SPL: Initialising mx28 SDRAM Controller\n");
316
317 /* Set DDR2 mode */
318 writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2,
319 &pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set);
320
321 /*
322 * Configure the DRAM registers
323 */
324
325 /* Clear START bit from DRAM_CTL16 */
326 clrbits_le32(MXS_DRAM_BASE + 0x40, 1);
327
328 initialize_dram_values();
329
330 /* Clear SREFRESH bit from DRAM_CTL17 */
331 clrbits_le32(MXS_DRAM_BASE + 0x44, 1);
332
333 /* Set START bit in DRAM_CTL16 */
334 setbits_le32(MXS_DRAM_BASE + 0x40, 1);
335
336 /* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */
337 while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20)))
338 ;
339 }
340 #endif
341
mxs_mem_init(void)342 void mxs_mem_init(void)
343 {
344 early_delay(11000);
345
346 mxs_mem_init_clock();
347
348 mxs_mem_setup_vdda();
349
350 #if defined(CONFIG_MX23)
351 mx23_mem_init();
352 #elif defined(CONFIG_MX28)
353 mx28_mem_init();
354 #endif
355
356 early_delay(10000);
357
358 mxs_mem_setup_cpu_and_hbus();
359 }
360