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 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 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 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 140 141 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 } 181 182 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 } 215 216 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 } 228 229 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 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 } 265 266 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 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 341 342 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