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 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <config.h> 12 #include <asm/io.h> 13 #include <asm/arch/imx-regs.h> 14 #include <asm/arch/sys_proto.h> 15 #include <linux/compiler.h> 16 17 #include "mxs_init.h" 18 19 static uint32_t dram_vals[] = { 20 /* 21 * i.MX28 DDR2 at 200MHz 22 */ 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 72 73 /* 74 * i.MX23 DDR at 133MHz 75 */ 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, 87 0x00010000 88 #else 89 #error Unsupported memory initialization 90 #endif 91 }; 92 93 __weak void mxs_adjust_memory_params(uint32_t *dram_vals) 94 { 95 } 96 97 #ifdef CONFIG_MX28 98 static void initialize_dram_values(void) 99 { 100 int i; 101 102 mxs_adjust_memory_params(dram_vals); 103 104 for (i = 0; i < ARRAY_SIZE(dram_vals); i++) 105 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i)); 106 } 107 #else 108 static void initialize_dram_values(void) 109 { 110 int i; 111 112 mxs_adjust_memory_params(dram_vals); 113 114 /* 115 * HW_DRAM_CTL27, HW_DRAM_CTL28 and HW_DRAM_CTL35 are not initialized as 116 * per FSL bootlets code. 117 * 118 * mx23 Reference Manual marks HW_DRAM_CTL27 and HW_DRAM_CTL28 as 119 * "reserved". 120 * HW_DRAM_CTL8 is setup as the last element. 121 * So skip the initialization of these HW_DRAM_CTL registers. 122 */ 123 for (i = 0; i < ARRAY_SIZE(dram_vals); i++) { 124 if (i == 8 || i == 27 || i == 28 || i == 35) 125 continue; 126 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i)); 127 } 128 129 /* 130 * Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last 131 * element to be set 132 */ 133 writel((1 << 24), MXS_DRAM_BASE + (4 * 8)); 134 } 135 #endif 136 137 static void mxs_mem_init_clock(void) 138 { 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; 147 #endif 148 149 /* Gate EMI clock */ 150 writeb(CLKCTRL_FRAC_CLKGATE, 151 &clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]); 152 153 /* 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]); 156 157 /* Ungate EMI clock */ 158 writeb(CLKCTRL_FRAC_CLKGATE, 159 &clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]); 160 161 early_delay(11000); 162 163 /* 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); 167 168 /* Unbypass EMI */ 169 writel(CLKCTRL_CLKSEQ_BYPASS_EMI, 170 &clkctrl_regs->hw_clkctrl_clkseq_clr); 171 172 early_delay(10000); 173 } 174 175 static void mxs_mem_setup_cpu_and_hbus(void) 176 { 177 struct mxs_clkctrl_regs *clkctrl_regs = 178 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; 179 180 /* 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]); 184 185 /* Set CPU bypass */ 186 writel(CLKCTRL_CLKSEQ_BYPASS_CPU, 187 &clkctrl_regs->hw_clkctrl_clkseq_set); 188 189 /* HBUS = 151MHz */ 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); 193 194 early_delay(10000); 195 196 /* CPU clock divider = 1 */ 197 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu, 198 CLKCTRL_CPU_DIV_CPU_MASK, 1); 199 200 /* Disable CPU bypass */ 201 writel(CLKCTRL_CLKSEQ_BYPASS_CPU, 202 &clkctrl_regs->hw_clkctrl_clkseq_clr); 203 204 early_delay(15000); 205 } 206 207 static void mxs_mem_setup_vdda(void) 208 { 209 struct mxs_power_regs *power_regs = 210 (struct mxs_power_regs *)MXS_POWER_BASE; 211 212 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); 216 } 217 218 uint32_t mxs_mem_get_size(void) 219 { 220 uint32_t sz, da; 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; 224 225 /* Replace the DABT handler. */ 226 da = vt[4]; 227 vt[4] = data_abort_memdetect_handler; 228 229 sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE); 230 231 /* Restore the old DABT handler. */ 232 vt[4] = da; 233 234 return sz; 235 } 236 237 #ifdef CONFIG_MX23 238 static void mx23_mem_setup_vddmem(void) 239 { 240 struct mxs_power_regs *power_regs = 241 (struct mxs_power_regs *)MXS_POWER_BASE; 242 243 /* We must wait before and after disabling the current limiter! */ 244 early_delay(10000); 245 246 clrbits_le32(&power_regs->hw_power_vddmemctrl, 247 POWER_VDDMEMCTRL_ENABLE_ILIMIT); 248 249 early_delay(10000); 250 251 } 252 253 static void mx23_mem_init(void) 254 { 255 /* 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. 259 */ 260 mxs_reset_block((struct mxs_register_32 *)MXS_EMI_BASE); 261 262 mx23_mem_setup_vddmem(); 263 264 /* 265 * Configure the DRAM registers 266 */ 267 268 /* Clear START and SREFRESH bit from DRAM_CTL8 */ 269 clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8)); 270 271 initialize_dram_values(); 272 273 /* Set START bit in DRAM_CTL8 */ 274 setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16); 275 276 clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17); 277 278 /* Wait for EMI_STAT bit DRAM_HALTED */ 279 for (;;) { 280 if (!(readl(MXS_EMI_BASE + 0x10) & (1 << 1))) 281 break; 282 early_delay(1000); 283 } 284 285 /* Adjust EMI port priority. */ 286 clrsetbits_le32(0x80020000, 0x1f << 16, 0x2); 287 early_delay(20000); 288 289 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19); 290 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11); 291 } 292 #endif 293 294 #ifdef CONFIG_MX28 295 static void mx28_mem_init(void) 296 { 297 struct mxs_pinctrl_regs *pinctrl_regs = 298 (struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE; 299 300 /* Set DDR2 mode */ 301 writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2, 302 &pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set); 303 304 /* 305 * Configure the DRAM registers 306 */ 307 308 /* Clear START bit from DRAM_CTL16 */ 309 clrbits_le32(MXS_DRAM_BASE + 0x40, 1); 310 311 initialize_dram_values(); 312 313 /* Clear SREFRESH bit from DRAM_CTL17 */ 314 clrbits_le32(MXS_DRAM_BASE + 0x44, 1); 315 316 /* Set START bit in DRAM_CTL16 */ 317 setbits_le32(MXS_DRAM_BASE + 0x40, 1); 318 319 /* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */ 320 while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20))) 321 ; 322 } 323 #endif 324 325 void mxs_mem_init(void) 326 { 327 early_delay(11000); 328 329 mxs_mem_init_clock(); 330 331 mxs_mem_setup_vdda(); 332 333 #if defined(CONFIG_MX23) 334 mx23_mem_init(); 335 #elif defined(CONFIG_MX28) 336 mx28_mem_init(); 337 #endif 338 339 early_delay(10000); 340 341 mxs_mem_setup_cpu_and_hbus(); 342 } 343