1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved 4 * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics. 5 */ 6 7 #include <common.h> 8 #include <clk.h> 9 #include <dm.h> 10 #include <ram.h> 11 #include <asm/io.h> 12 13 #define MEM_MODE_MASK GENMASK(2, 0) 14 #define SWP_FMC_OFFSET 10 15 #define SWP_FMC_MASK GENMASK(SWP_FMC_OFFSET+1, SWP_FMC_OFFSET) 16 #define NOT_FOUND 0xff 17 18 struct stm32_fmc_regs { 19 /* 0x0 */ 20 u32 bcr1; /* NOR/PSRAM Chip select control register 1 */ 21 u32 btr1; /* SRAM/NOR-Flash Chip select timing register 1 */ 22 u32 bcr2; /* NOR/PSRAM Chip select Control register 2 */ 23 u32 btr2; /* SRAM/NOR-Flash Chip select timing register 2 */ 24 u32 bcr3; /* NOR/PSRAMChip select Control register 3 */ 25 u32 btr3; /* SRAM/NOR-Flash Chip select timing register 3 */ 26 u32 bcr4; /* NOR/PSRAM Chip select Control register 4 */ 27 u32 btr4; /* SRAM/NOR-Flash Chip select timing register 4 */ 28 u32 reserved1[24]; 29 30 /* 0x80 */ 31 u32 pcr; /* NAND Flash control register */ 32 u32 sr; /* FIFO status and interrupt register */ 33 u32 pmem; /* Common memory space timing register */ 34 u32 patt; /* Attribute memory space timing registers */ 35 u32 reserved2[1]; 36 u32 eccr; /* ECC result registers */ 37 u32 reserved3[27]; 38 39 /* 0x104 */ 40 u32 bwtr1; /* SRAM/NOR-Flash write timing register 1 */ 41 u32 reserved4[1]; 42 u32 bwtr2; /* SRAM/NOR-Flash write timing register 2 */ 43 u32 reserved5[1]; 44 u32 bwtr3; /* SRAM/NOR-Flash write timing register 3 */ 45 u32 reserved6[1]; 46 u32 bwtr4; /* SRAM/NOR-Flash write timing register 4 */ 47 u32 reserved7[8]; 48 49 /* 0x140 */ 50 u32 sdcr1; /* SDRAM Control register 1 */ 51 u32 sdcr2; /* SDRAM Control register 2 */ 52 u32 sdtr1; /* SDRAM Timing register 1 */ 53 u32 sdtr2; /* SDRAM Timing register 2 */ 54 u32 sdcmr; /* SDRAM Mode register */ 55 u32 sdrtr; /* SDRAM Refresh timing register */ 56 u32 sdsr; /* SDRAM Status register */ 57 }; 58 59 /* 60 * NOR/PSRAM Control register BCR1 61 * FMC controller Enable, only availabe for H7 62 */ 63 #define FMC_BCR1_FMCEN BIT(31) 64 65 /* Control register SDCR */ 66 #define FMC_SDCR_RPIPE_SHIFT 13 /* RPIPE bit shift */ 67 #define FMC_SDCR_RBURST_SHIFT 12 /* RBURST bit shift */ 68 #define FMC_SDCR_SDCLK_SHIFT 10 /* SDRAM clock divisor shift */ 69 #define FMC_SDCR_WP_SHIFT 9 /* Write protection shift */ 70 #define FMC_SDCR_CAS_SHIFT 7 /* CAS latency shift */ 71 #define FMC_SDCR_NB_SHIFT 6 /* Number of banks shift */ 72 #define FMC_SDCR_MWID_SHIFT 4 /* Memory width shift */ 73 #define FMC_SDCR_NR_SHIFT 2 /* Number of row address bits shift */ 74 #define FMC_SDCR_NC_SHIFT 0 /* Number of col address bits shift */ 75 76 /* Timings register SDTR */ 77 #define FMC_SDTR_TMRD_SHIFT 0 /* Load mode register to active */ 78 #define FMC_SDTR_TXSR_SHIFT 4 /* Exit self-refresh time */ 79 #define FMC_SDTR_TRAS_SHIFT 8 /* Self-refresh time */ 80 #define FMC_SDTR_TRC_SHIFT 12 /* Row cycle delay */ 81 #define FMC_SDTR_TWR_SHIFT 16 /* Recovery delay */ 82 #define FMC_SDTR_TRP_SHIFT 20 /* Row precharge delay */ 83 #define FMC_SDTR_TRCD_SHIFT 24 /* Row-to-column delay */ 84 85 #define FMC_SDCMR_NRFS_SHIFT 5 86 87 #define FMC_SDCMR_MODE_NORMAL 0 88 #define FMC_SDCMR_MODE_START_CLOCK 1 89 #define FMC_SDCMR_MODE_PRECHARGE 2 90 #define FMC_SDCMR_MODE_AUTOREFRESH 3 91 #define FMC_SDCMR_MODE_WRITE_MODE 4 92 #define FMC_SDCMR_MODE_SELFREFRESH 5 93 #define FMC_SDCMR_MODE_POWERDOWN 6 94 95 #define FMC_SDCMR_BANK_1 BIT(4) 96 #define FMC_SDCMR_BANK_2 BIT(3) 97 98 #define FMC_SDCMR_MODE_REGISTER_SHIFT 9 99 100 #define FMC_SDSR_BUSY BIT(5) 101 102 #define FMC_BUSY_WAIT(regs) do { \ 103 __asm__ __volatile__ ("dsb" : : : "memory"); \ 104 while (regs->sdsr & FMC_SDSR_BUSY) \ 105 ; \ 106 } while (0) 107 108 struct stm32_sdram_control { 109 u8 no_columns; 110 u8 no_rows; 111 u8 memory_width; 112 u8 no_banks; 113 u8 cas_latency; 114 u8 sdclk; 115 u8 rd_burst; 116 u8 rd_pipe_delay; 117 }; 118 119 struct stm32_sdram_timing { 120 u8 tmrd; 121 u8 txsr; 122 u8 tras; 123 u8 trc; 124 u8 trp; 125 u8 twr; 126 u8 trcd; 127 }; 128 enum stm32_fmc_bank { 129 SDRAM_BANK1, 130 SDRAM_BANK2, 131 MAX_SDRAM_BANK, 132 }; 133 134 enum stm32_fmc_family { 135 STM32F7_FMC, 136 STM32H7_FMC, 137 }; 138 139 struct bank_params { 140 struct stm32_sdram_control *sdram_control; 141 struct stm32_sdram_timing *sdram_timing; 142 u32 sdram_ref_count; 143 enum stm32_fmc_bank target_bank; 144 }; 145 146 struct stm32_sdram_params { 147 struct stm32_fmc_regs *base; 148 u8 no_sdram_banks; 149 struct bank_params bank_params[MAX_SDRAM_BANK]; 150 enum stm32_fmc_family family; 151 }; 152 153 #define SDRAM_MODE_BL_SHIFT 0 154 #define SDRAM_MODE_CAS_SHIFT 4 155 #define SDRAM_MODE_BL 0 156 157 int stm32_sdram_init(struct udevice *dev) 158 { 159 struct stm32_sdram_params *params = dev_get_platdata(dev); 160 struct stm32_sdram_control *control; 161 struct stm32_sdram_timing *timing; 162 struct stm32_fmc_regs *regs = params->base; 163 enum stm32_fmc_bank target_bank; 164 u32 ctb; /* SDCMR register: Command Target Bank */ 165 u32 ref_count; 166 u8 i; 167 168 /* disable the FMC controller */ 169 if (params->family == STM32H7_FMC) 170 clrbits_le32(®s->bcr1, FMC_BCR1_FMCEN); 171 172 for (i = 0; i < params->no_sdram_banks; i++) { 173 control = params->bank_params[i].sdram_control; 174 timing = params->bank_params[i].sdram_timing; 175 target_bank = params->bank_params[i].target_bank; 176 ref_count = params->bank_params[i].sdram_ref_count; 177 178 writel(control->sdclk << FMC_SDCR_SDCLK_SHIFT 179 | control->cas_latency << FMC_SDCR_CAS_SHIFT 180 | control->no_banks << FMC_SDCR_NB_SHIFT 181 | control->memory_width << FMC_SDCR_MWID_SHIFT 182 | control->no_rows << FMC_SDCR_NR_SHIFT 183 | control->no_columns << FMC_SDCR_NC_SHIFT 184 | control->rd_pipe_delay << FMC_SDCR_RPIPE_SHIFT 185 | control->rd_burst << FMC_SDCR_RBURST_SHIFT, 186 ®s->sdcr1); 187 188 if (target_bank == SDRAM_BANK2) 189 writel(control->cas_latency << FMC_SDCR_CAS_SHIFT 190 | control->no_banks << FMC_SDCR_NB_SHIFT 191 | control->memory_width << FMC_SDCR_MWID_SHIFT 192 | control->no_rows << FMC_SDCR_NR_SHIFT 193 | control->no_columns << FMC_SDCR_NC_SHIFT, 194 ®s->sdcr2); 195 196 writel(timing->trcd << FMC_SDTR_TRCD_SHIFT 197 | timing->trp << FMC_SDTR_TRP_SHIFT 198 | timing->twr << FMC_SDTR_TWR_SHIFT 199 | timing->trc << FMC_SDTR_TRC_SHIFT 200 | timing->tras << FMC_SDTR_TRAS_SHIFT 201 | timing->txsr << FMC_SDTR_TXSR_SHIFT 202 | timing->tmrd << FMC_SDTR_TMRD_SHIFT, 203 ®s->sdtr1); 204 205 if (target_bank == SDRAM_BANK2) 206 writel(timing->trcd << FMC_SDTR_TRCD_SHIFT 207 | timing->trp << FMC_SDTR_TRP_SHIFT 208 | timing->twr << FMC_SDTR_TWR_SHIFT 209 | timing->trc << FMC_SDTR_TRC_SHIFT 210 | timing->tras << FMC_SDTR_TRAS_SHIFT 211 | timing->txsr << FMC_SDTR_TXSR_SHIFT 212 | timing->tmrd << FMC_SDTR_TMRD_SHIFT, 213 ®s->sdtr2); 214 215 if (target_bank == SDRAM_BANK1) 216 ctb = FMC_SDCMR_BANK_1; 217 else 218 ctb = FMC_SDCMR_BANK_2; 219 220 writel(ctb | FMC_SDCMR_MODE_START_CLOCK, ®s->sdcmr); 221 udelay(200); /* 200 us delay, page 10, "Power-Up" */ 222 FMC_BUSY_WAIT(regs); 223 224 writel(ctb | FMC_SDCMR_MODE_PRECHARGE, ®s->sdcmr); 225 udelay(100); 226 FMC_BUSY_WAIT(regs); 227 228 writel((ctb | FMC_SDCMR_MODE_AUTOREFRESH | 7 << FMC_SDCMR_NRFS_SHIFT), 229 ®s->sdcmr); 230 udelay(100); 231 FMC_BUSY_WAIT(regs); 232 233 writel(ctb | (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT 234 | control->cas_latency << SDRAM_MODE_CAS_SHIFT) 235 << FMC_SDCMR_MODE_REGISTER_SHIFT | FMC_SDCMR_MODE_WRITE_MODE, 236 ®s->sdcmr); 237 udelay(100); 238 FMC_BUSY_WAIT(regs); 239 240 writel(ctb | FMC_SDCMR_MODE_NORMAL, ®s->sdcmr); 241 FMC_BUSY_WAIT(regs); 242 243 /* Refresh timer */ 244 writel(ref_count << 1, ®s->sdrtr); 245 } 246 247 /* enable the FMC controller */ 248 if (params->family == STM32H7_FMC) 249 setbits_le32(®s->bcr1, FMC_BCR1_FMCEN); 250 251 return 0; 252 } 253 254 static int stm32_fmc_ofdata_to_platdata(struct udevice *dev) 255 { 256 struct stm32_sdram_params *params = dev_get_platdata(dev); 257 struct bank_params *bank_params; 258 struct ofnode_phandle_args args; 259 u32 *syscfg_base; 260 u32 mem_remap; 261 u32 swp_fmc; 262 ofnode bank_node; 263 char *bank_name; 264 u8 bank = 0; 265 int ret; 266 267 ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0, 268 &args); 269 if (ret) { 270 dev_dbg(dev, "%s: can't find syscon device (%d)\n", __func__, ret); 271 } else { 272 syscfg_base = (u32 *)ofnode_get_addr(args.node); 273 274 mem_remap = dev_read_u32_default(dev, "st,mem_remap", NOT_FOUND); 275 if (mem_remap != NOT_FOUND) { 276 /* set memory mapping selection */ 277 clrsetbits_le32(syscfg_base, MEM_MODE_MASK, mem_remap); 278 } else { 279 dev_dbg(dev, "%s: cannot find st,mem_remap property\n", __func__); 280 } 281 282 swp_fmc = dev_read_u32_default(dev, "st,swp_fmc", NOT_FOUND); 283 if (swp_fmc != NOT_FOUND) { 284 /* set fmc swapping selection */ 285 clrsetbits_le32(syscfg_base, SWP_FMC_MASK, swp_fmc << SWP_FMC_OFFSET); 286 } else { 287 dev_dbg(dev, "%s: cannot find st,swp_fmc property\n", __func__); 288 } 289 290 dev_dbg(dev, "syscfg %x = %x\n", (u32)syscfg_base, *syscfg_base); 291 } 292 293 dev_for_each_subnode(bank_node, dev) { 294 /* extract the bank index from DT */ 295 bank_name = (char *)ofnode_get_name(bank_node); 296 strsep(&bank_name, "@"); 297 if (!bank_name) { 298 pr_err("missing sdram bank index"); 299 return -EINVAL; 300 } 301 302 bank_params = ¶ms->bank_params[bank]; 303 strict_strtoul(bank_name, 10, 304 (long unsigned int *)&bank_params->target_bank); 305 306 if (bank_params->target_bank >= MAX_SDRAM_BANK) { 307 pr_err("Found bank %d , but only bank 0 and 1 are supported", 308 bank_params->target_bank); 309 return -EINVAL; 310 } 311 312 debug("Find bank %s %u\n", bank_name, bank_params->target_bank); 313 314 params->bank_params[bank].sdram_control = 315 (struct stm32_sdram_control *) 316 ofnode_read_u8_array_ptr(bank_node, 317 "st,sdram-control", 318 sizeof(struct stm32_sdram_control)); 319 320 if (!params->bank_params[bank].sdram_control) { 321 pr_err("st,sdram-control not found for %s", 322 ofnode_get_name(bank_node)); 323 return -EINVAL; 324 } 325 326 327 params->bank_params[bank].sdram_timing = 328 (struct stm32_sdram_timing *) 329 ofnode_read_u8_array_ptr(bank_node, 330 "st,sdram-timing", 331 sizeof(struct stm32_sdram_timing)); 332 333 if (!params->bank_params[bank].sdram_timing) { 334 pr_err("st,sdram-timing not found for %s", 335 ofnode_get_name(bank_node)); 336 return -EINVAL; 337 } 338 339 340 bank_params->sdram_ref_count = ofnode_read_u32_default(bank_node, 341 "st,sdram-refcount", 8196); 342 bank++; 343 } 344 345 params->no_sdram_banks = bank; 346 debug("%s, no of banks = %d\n", __func__, params->no_sdram_banks); 347 348 return 0; 349 } 350 351 static int stm32_fmc_probe(struct udevice *dev) 352 { 353 struct stm32_sdram_params *params = dev_get_platdata(dev); 354 int ret; 355 fdt_addr_t addr; 356 357 addr = dev_read_addr(dev); 358 if (addr == FDT_ADDR_T_NONE) 359 return -EINVAL; 360 361 params->base = (struct stm32_fmc_regs *)addr; 362 params->family = dev_get_driver_data(dev); 363 364 #ifdef CONFIG_CLK 365 struct clk clk; 366 367 ret = clk_get_by_index(dev, 0, &clk); 368 if (ret < 0) 369 return ret; 370 371 ret = clk_enable(&clk); 372 373 if (ret) { 374 dev_err(dev, "failed to enable clock\n"); 375 return ret; 376 } 377 #endif 378 ret = stm32_sdram_init(dev); 379 if (ret) 380 return ret; 381 382 return 0; 383 } 384 385 static int stm32_fmc_get_info(struct udevice *dev, struct ram_info *info) 386 { 387 return 0; 388 } 389 390 static struct ram_ops stm32_fmc_ops = { 391 .get_info = stm32_fmc_get_info, 392 }; 393 394 static const struct udevice_id stm32_fmc_ids[] = { 395 { .compatible = "st,stm32-fmc", .data = STM32F7_FMC }, 396 { .compatible = "st,stm32h7-fmc", .data = STM32H7_FMC }, 397 { } 398 }; 399 400 U_BOOT_DRIVER(stm32_fmc) = { 401 .name = "stm32_fmc", 402 .id = UCLASS_RAM, 403 .of_match = stm32_fmc_ids, 404 .ops = &stm32_fmc_ops, 405 .ofdata_to_platdata = stm32_fmc_ofdata_to_platdata, 406 .probe = stm32_fmc_probe, 407 .platdata_auto_alloc_size = sizeof(struct stm32_sdram_params), 408 }; 409