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 * See file CREDITS for list of people who contributed to this 8 * project. 9 * 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. 14 * 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. 19 * 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, 23 * MA 02111-1307 USA 24 */ 25 26 #include <common.h> 27 #include <config.h> 28 #include <asm/io.h> 29 #include <asm/arch/imx-regs.h> 30 #include <asm/arch/sys_proto.h> 31 #include <linux/compiler.h> 32 33 #include "mxs_init.h" 34 35 static uint32_t dram_vals[] = { 36 /* 37 * i.MX28 DDR2 at 200MHz 38 */ 39 #if defined(CONFIG_MX28) 40 0x00000000, 0x00000000, 0x00000000, 0x00000000, 41 0x00000000, 0x00000000, 0x00000000, 0x00000000, 42 0x00000000, 0x00000000, 0x00000000, 0x00000000, 43 0x00000000, 0x00000000, 0x00000000, 0x00000000, 44 0x00000000, 0x00000100, 0x00000000, 0x00000000, 45 0x00000000, 0x00000000, 0x00000000, 0x00000000, 46 0x00000000, 0x00000000, 0x00010101, 0x01010101, 47 0x000f0f01, 0x0f02020a, 0x00000000, 0x00010101, 48 0x00000100, 0x00000100, 0x00000000, 0x00000002, 49 0x01010000, 0x07080403, 0x06005003, 0x0a0000c8, 50 0x02009c40, 0x0002030c, 0x0036a609, 0x031a0612, 51 0x02030202, 0x00c8001c, 0x00000000, 0x00000000, 52 0x00012100, 0xffff0303, 0x00012100, 0xffff0303, 53 0x00012100, 0xffff0303, 0x00012100, 0xffff0303, 54 0x00000003, 0x00000000, 0x00000000, 0x00000000, 55 0x00000000, 0x00000000, 0x00000000, 0x00000000, 56 0x00000000, 0x00000000, 0x00000612, 0x01000F02, 57 0x06120612, 0x00000200, 0x00020007, 0xf4004a27, 58 0xf4004a27, 0xf4004a27, 0xf4004a27, 0x07000300, 59 0x07000300, 0x07400300, 0x07400300, 0x00000005, 60 0x00000000, 0x00000000, 0x01000000, 0x01020408, 61 0x08040201, 0x000f1133, 0x00000000, 0x00001f04, 62 0x00001f04, 0x00001f04, 0x00001f04, 0x00001f04, 63 0x00001f04, 0x00001f04, 0x00001f04, 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, 0x00000000, 0x00000000, 79 0x00000000, 0x00000000, 0x00000000, 0x00000000, 80 0x00000000, 0x00000000, 0x00010000, 0x00030404, 81 0x00000003, 0x00000000, 0x00000000, 0x00000000, 82 0x00000000, 0x00000000, 0x00000000, 0x01010000, 83 0x01000000, 0x03030000, 0x00010303, 0x01020202, 84 0x00000000, 0x02040303, 0x21002103, 0x00061200, 85 0x06120612, 0x04420442, 0x04420442, 0x00040004, 86 0x00040004, 0x00000000, 0x00000000, 0x00000000, 87 0x00000000, 0xffffffff 88 89 /* 90 * i.MX23 DDR at 133MHz 91 */ 92 #elif defined(CONFIG_MX23) 93 0x01010001, 0x00010100, 0x01000101, 0x00000001, 94 0x00000101, 0x00000000, 0x00010000, 0x01000001, 95 0x00000000, 0x00000001, 0x07000200, 0x00070202, 96 0x02020000, 0x04040a01, 0x00000201, 0x02040000, 97 0x02000000, 0x19000f08, 0x0d0d0000, 0x02021313, 98 0x02061521, 0x0000000a, 0x00080008, 0x00200020, 99 0x00200020, 0x00200020, 0x000003f7, 0x00000000, 100 0x00000000, 0x00000020, 0x00000020, 0x00c80000, 101 0x000a23cd, 0x000000c8, 0x00006665, 0x00000000, 102 0x00000101, 0x00040001, 0x00000000, 0x00000000, 103 0x00010000 104 #else 105 #error Unsupported memory initialization 106 #endif 107 }; 108 109 __weak void mxs_adjust_memory_params(uint32_t *dram_vals) 110 { 111 } 112 113 static void initialize_dram_values(void) 114 { 115 int i; 116 117 mxs_adjust_memory_params(dram_vals); 118 119 for (i = 0; i < ARRAY_SIZE(dram_vals); i++) 120 writel(dram_vals[i], MXS_DRAM_BASE + (4 * i)); 121 122 #ifdef CONFIG_MX23 123 /* 124 * Enable tRAS lockout in HW_DRAM_CTL08 ; it must be the last 125 * element to be set 126 */ 127 writel((1 << 24), MXS_DRAM_BASE + (4 * 8)); 128 #endif 129 } 130 131 static void mxs_mem_init_clock(void) 132 { 133 struct mxs_clkctrl_regs *clkctrl_regs = 134 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; 135 #if defined(CONFIG_MX23) 136 /* Fractional divider for ref_emi is 33 ; 480 * 18 / 33 = 266MHz */ 137 const unsigned char divider = 33; 138 #elif defined(CONFIG_MX28) 139 /* Fractional divider for ref_emi is 21 ; 480 * 18 / 21 = 411MHz */ 140 const unsigned char divider = 21; 141 #endif 142 143 /* Gate EMI clock */ 144 writeb(CLKCTRL_FRAC_CLKGATE, 145 &clkctrl_regs->hw_clkctrl_frac0_set[CLKCTRL_FRAC0_EMI]); 146 147 /* Set fractional divider for ref_emi */ 148 writeb(CLKCTRL_FRAC_CLKGATE | (divider & CLKCTRL_FRAC_FRAC_MASK), 149 &clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_EMI]); 150 151 /* Ungate EMI clock */ 152 writeb(CLKCTRL_FRAC_CLKGATE, 153 &clkctrl_regs->hw_clkctrl_frac0_clr[CLKCTRL_FRAC0_EMI]); 154 155 early_delay(11000); 156 157 /* Set EMI clock divider for EMI clock to 411 / 2 = 205MHz */ 158 writel((2 << CLKCTRL_EMI_DIV_EMI_OFFSET) | 159 (1 << CLKCTRL_EMI_DIV_XTAL_OFFSET), 160 &clkctrl_regs->hw_clkctrl_emi); 161 162 /* Unbypass EMI */ 163 writel(CLKCTRL_CLKSEQ_BYPASS_EMI, 164 &clkctrl_regs->hw_clkctrl_clkseq_clr); 165 166 early_delay(10000); 167 } 168 169 static void mxs_mem_setup_cpu_and_hbus(void) 170 { 171 struct mxs_clkctrl_regs *clkctrl_regs = 172 (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE; 173 174 /* Set fractional divider for ref_cpu to 480 * 18 / 19 = 454MHz 175 * and ungate CPU clock */ 176 writeb(19 & CLKCTRL_FRAC_FRAC_MASK, 177 (uint8_t *)&clkctrl_regs->hw_clkctrl_frac0[CLKCTRL_FRAC0_CPU]); 178 179 /* Set CPU bypass */ 180 writel(CLKCTRL_CLKSEQ_BYPASS_CPU, 181 &clkctrl_regs->hw_clkctrl_clkseq_set); 182 183 /* HBUS = 151MHz */ 184 writel(CLKCTRL_HBUS_DIV_MASK, &clkctrl_regs->hw_clkctrl_hbus_set); 185 writel(((~3) << CLKCTRL_HBUS_DIV_OFFSET) & CLKCTRL_HBUS_DIV_MASK, 186 &clkctrl_regs->hw_clkctrl_hbus_clr); 187 188 early_delay(10000); 189 190 /* CPU clock divider = 1 */ 191 clrsetbits_le32(&clkctrl_regs->hw_clkctrl_cpu, 192 CLKCTRL_CPU_DIV_CPU_MASK, 1); 193 194 /* Disable CPU bypass */ 195 writel(CLKCTRL_CLKSEQ_BYPASS_CPU, 196 &clkctrl_regs->hw_clkctrl_clkseq_clr); 197 198 early_delay(15000); 199 } 200 201 static void mxs_mem_setup_vdda(void) 202 { 203 struct mxs_power_regs *power_regs = 204 (struct mxs_power_regs *)MXS_POWER_BASE; 205 206 writel((0xc << POWER_VDDACTRL_TRG_OFFSET) | 207 (0x7 << POWER_VDDACTRL_BO_OFFSET_OFFSET) | 208 POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW, 209 &power_regs->hw_power_vddactrl); 210 } 211 212 uint32_t mxs_mem_get_size(void) 213 { 214 uint32_t sz, da; 215 uint32_t *vt = (uint32_t *)0x20; 216 /* The following is "subs pc, r14, #4", used as return from DABT. */ 217 const uint32_t data_abort_memdetect_handler = 0xe25ef004; 218 219 /* Replace the DABT handler. */ 220 da = vt[4]; 221 vt[4] = data_abort_memdetect_handler; 222 223 sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE); 224 225 /* Restore the old DABT handler. */ 226 vt[4] = da; 227 228 return sz; 229 } 230 231 #ifdef CONFIG_MX23 232 static void mx23_mem_setup_vddmem(void) 233 { 234 struct mxs_power_regs *power_regs = 235 (struct mxs_power_regs *)MXS_POWER_BASE; 236 237 writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) | 238 POWER_VDDMEMCTRL_ENABLE_ILIMIT | 239 POWER_VDDMEMCTRL_ENABLE_LINREG | 240 POWER_VDDMEMCTRL_PULLDOWN_ACTIVE, 241 &power_regs->hw_power_vddmemctrl); 242 243 early_delay(10000); 244 245 writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) | 246 POWER_VDDMEMCTRL_ENABLE_LINREG, 247 &power_regs->hw_power_vddmemctrl); 248 } 249 250 static void mx23_mem_init(void) 251 { 252 /* 253 * Reset/ungate the EMI block. This is essential, otherwise the system 254 * suffers from memory instability. This thing is mx23 specific and is 255 * no longer present on mx28. 256 */ 257 mxs_reset_block((struct mxs_register_32 *)MXS_EMI_BASE); 258 259 mx23_mem_setup_vddmem(); 260 261 /* 262 * Configure the DRAM registers 263 */ 264 265 /* Clear START and SREFRESH bit from DRAM_CTL8 */ 266 clrbits_le32(MXS_DRAM_BASE + 0x20, (1 << 16) | (1 << 8)); 267 268 initialize_dram_values(); 269 270 /* Set START bit in DRAM_CTL16 */ 271 setbits_le32(MXS_DRAM_BASE + 0x20, 1 << 16); 272 273 clrbits_le32(MXS_DRAM_BASE + 0x40, 1 << 17); 274 early_delay(20000); 275 276 /* Adjust EMI port priority. */ 277 clrsetbits_le32(0x80020000, 0x1f << 16, 0x8); 278 early_delay(20000); 279 280 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 19); 281 setbits_le32(MXS_DRAM_BASE + 0x40, 1 << 11); 282 283 /* Wait for bit 10 (DRAM init complete) in DRAM_CTL18 */ 284 while (!(readl(MXS_DRAM_BASE + 0x48) & (1 << 10))) 285 ; 286 } 287 #endif 288 289 #ifdef CONFIG_MX28 290 static void mx28_mem_init(void) 291 { 292 struct mxs_pinctrl_regs *pinctrl_regs = 293 (struct mxs_pinctrl_regs *)MXS_PINCTRL_BASE; 294 295 /* Set DDR2 mode */ 296 writel(PINCTRL_EMI_DS_CTRL_DDR_MODE_DDR2, 297 &pinctrl_regs->hw_pinctrl_emi_ds_ctrl_set); 298 299 /* 300 * Configure the DRAM registers 301 */ 302 303 /* Clear START bit from DRAM_CTL16 */ 304 clrbits_le32(MXS_DRAM_BASE + 0x40, 1); 305 306 initialize_dram_values(); 307 308 /* Clear SREFRESH bit from DRAM_CTL17 */ 309 clrbits_le32(MXS_DRAM_BASE + 0x44, 1); 310 311 /* Set START bit in DRAM_CTL16 */ 312 setbits_le32(MXS_DRAM_BASE + 0x40, 1); 313 314 /* Wait for bit 20 (DRAM init complete) in DRAM_CTL58 */ 315 while (!(readl(MXS_DRAM_BASE + 0xe8) & (1 << 20))) 316 ; 317 } 318 #endif 319 320 void mxs_mem_init(void) 321 { 322 early_delay(11000); 323 324 mxs_mem_init_clock(); 325 326 mxs_mem_setup_vdda(); 327 328 #if defined(CONFIG_MX23) 329 mx23_mem_init(); 330 #elif defined(CONFIG_MX28) 331 mx28_mem_init(); 332 #endif 333 334 early_delay(10000); 335 336 mxs_mem_setup_cpu_and_hbus(); 337 } 338