1 /* 2 * Copyright (C) 2010 3 * Rob Emanuele <rob@emanuele.us> 4 * Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de> 5 * 6 * Original Driver: 7 * Copyright (C) 2004-2006 Atmel Corporation 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <mmc.h> 14 #include <part.h> 15 #include <malloc.h> 16 #include <asm/io.h> 17 #include <linux/errno.h> 18 #include <asm/byteorder.h> 19 #include <asm/arch/clk.h> 20 #include <asm/arch/hardware.h> 21 #include "atmel_mci.h" 22 23 #ifndef CONFIG_SYS_MMC_CLK_OD 24 # define CONFIG_SYS_MMC_CLK_OD 150000 25 #endif 26 27 #define MMC_DEFAULT_BLKLEN 512 28 29 #if defined(CONFIG_ATMEL_MCI_PORTB) 30 # define MCI_BUS 1 31 #else 32 # define MCI_BUS 0 33 #endif 34 35 struct atmel_mci_priv { 36 struct mmc_config cfg; 37 struct atmel_mci *mci; 38 unsigned int initialized:1; 39 unsigned int curr_clk; 40 }; 41 42 /* Read Atmel MCI IP version */ 43 static unsigned int atmel_mci_get_version(struct atmel_mci *mci) 44 { 45 return readl(&mci->version) & 0x00000fff; 46 } 47 48 /* 49 * Print command and status: 50 * 51 * - always when DEBUG is defined 52 * - on command errors 53 */ 54 static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg) 55 { 56 debug("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n", 57 cmdr, cmdr & 0x3F, arg, status, msg); 58 } 59 60 /* Setup for MCI Clock and Block Size */ 61 static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen) 62 { 63 struct atmel_mci_priv *priv = mmc->priv; 64 atmel_mci_t *mci = priv->mci; 65 u32 bus_hz = get_mci_clk_rate(); 66 u32 clkdiv = 255; 67 unsigned int version = atmel_mci_get_version(mci); 68 u32 clkodd = 0; 69 u32 mr; 70 71 debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n", 72 bus_hz, hz, blklen); 73 if (hz > 0) { 74 if (version >= 0x500) { 75 clkdiv = DIV_ROUND_UP(bus_hz, hz) - 2; 76 if (clkdiv > 511) 77 clkdiv = 511; 78 79 clkodd = clkdiv & 1; 80 clkdiv >>= 1; 81 82 debug("mci: setting clock %u Hz, block size %u\n", 83 bus_hz / (clkdiv * 2 + clkodd + 2), blklen); 84 } else { 85 /* find clkdiv yielding a rate <= than requested */ 86 for (clkdiv = 0; clkdiv < 255; clkdiv++) { 87 if ((bus_hz / (clkdiv + 1) / 2) <= hz) 88 break; 89 } 90 debug("mci: setting clock %u Hz, block size %u\n", 91 (bus_hz / (clkdiv + 1)) / 2, blklen); 92 93 } 94 } 95 if (version >= 0x500) 96 priv->curr_clk = bus_hz / (clkdiv * 2 + clkodd + 2); 97 else 98 priv->curr_clk = (bus_hz / (clkdiv + 1)) / 2; 99 blklen &= 0xfffc; 100 101 mr = MMCI_BF(CLKDIV, clkdiv); 102 103 /* MCI IP version >= 0x200 has R/WPROOF */ 104 if (version >= 0x200) 105 mr |= MMCI_BIT(RDPROOF) | MMCI_BIT(WRPROOF); 106 107 /* 108 * MCI IP version >= 0x500 use bit 16 as clkodd. 109 * MCI IP version < 0x500 use upper 16 bits for blklen. 110 */ 111 if (version >= 0x500) 112 mr |= MMCI_BF(CLKODD, clkodd); 113 else 114 mr |= MMCI_BF(BLKLEN, blklen); 115 116 writel(mr, &mci->mr); 117 118 /* MCI IP version >= 0x200 has blkr */ 119 if (version >= 0x200) 120 writel(MMCI_BF(BLKLEN, blklen), &mci->blkr); 121 122 if (mmc->card_caps & mmc->cfg->host_caps & MMC_MODE_HS) 123 writel(MMCI_BIT(HSMODE), &mci->cfg); 124 125 priv->initialized = 1; 126 } 127 128 /* Return the CMDR with flags for a given command and data packet */ 129 static u32 mci_encode_cmd( 130 struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags) 131 { 132 u32 cmdr = 0; 133 134 /* Default Flags for Errors */ 135 *error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) | 136 MMCI_BIT(RINDE) | MMCI_BIT(RTOE)); 137 138 /* Default Flags for the Command */ 139 cmdr |= MMCI_BIT(MAXLAT); 140 141 if (data) { 142 cmdr |= MMCI_BF(TRCMD, 1); 143 if (data->blocks > 1) 144 cmdr |= MMCI_BF(TRTYP, 1); 145 if (data->flags & MMC_DATA_READ) 146 cmdr |= MMCI_BIT(TRDIR); 147 } 148 149 if (cmd->resp_type & MMC_RSP_CRC) 150 *error_flags |= MMCI_BIT(RCRCE); 151 if (cmd->resp_type & MMC_RSP_136) 152 cmdr |= MMCI_BF(RSPTYP, 2); 153 else if (cmd->resp_type & MMC_RSP_BUSY) 154 cmdr |= MMCI_BF(RSPTYP, 3); 155 else if (cmd->resp_type & MMC_RSP_PRESENT) 156 cmdr |= MMCI_BF(RSPTYP, 1); 157 158 return cmdr | MMCI_BF(CMDNB, cmd->cmdidx); 159 } 160 161 /* Entered into function pointer in mci_send_cmd */ 162 static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags) 163 { 164 u32 status; 165 166 do { 167 status = readl(&mci->sr); 168 if (status & (error_flags | MMCI_BIT(OVRE))) 169 goto io_fail; 170 } while (!(status & MMCI_BIT(RXRDY))); 171 172 if (status & MMCI_BIT(RXRDY)) { 173 *data = readl(&mci->rdr); 174 status = 0; 175 } 176 io_fail: 177 return status; 178 } 179 180 /* Entered into function pointer in mci_send_cmd */ 181 static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags) 182 { 183 u32 status; 184 185 do { 186 status = readl(&mci->sr); 187 if (status & (error_flags | MMCI_BIT(UNRE))) 188 goto io_fail; 189 } while (!(status & MMCI_BIT(TXRDY))); 190 191 if (status & MMCI_BIT(TXRDY)) { 192 writel(*data, &mci->tdr); 193 status = 0; 194 } 195 io_fail: 196 return status; 197 } 198 199 /* 200 * Entered into mmc structure during driver init 201 * 202 * Sends a command out on the bus and deals with the block data. 203 * Takes the mmc pointer, a command pointer, and an optional data pointer. 204 */ 205 static int 206 mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data) 207 { 208 struct atmel_mci_priv *priv = mmc->priv; 209 atmel_mci_t *mci = priv->mci; 210 u32 cmdr; 211 u32 error_flags = 0; 212 u32 status; 213 214 if (!priv->initialized) { 215 puts ("MCI not initialized!\n"); 216 return -ECOMM; 217 } 218 219 /* Figure out the transfer arguments */ 220 cmdr = mci_encode_cmd(cmd, data, &error_flags); 221 222 /* For multi blocks read/write, set the block register */ 223 if ((cmd->cmdidx == MMC_CMD_READ_MULTIPLE_BLOCK) 224 || (cmd->cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK)) 225 writel(data->blocks | MMCI_BF(BLKLEN, mmc->read_bl_len), 226 &mci->blkr); 227 228 /* Send the command */ 229 writel(cmd->cmdarg, &mci->argr); 230 writel(cmdr, &mci->cmdr); 231 232 #ifdef DEBUG 233 dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG"); 234 #endif 235 236 /* Wait for the command to complete */ 237 while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY))); 238 239 if ((status & error_flags) & MMCI_BIT(RTOE)) { 240 dump_cmd(cmdr, cmd->cmdarg, status, "Command Time Out"); 241 return -ETIMEDOUT; 242 } else if (status & error_flags) { 243 dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed"); 244 return -ECOMM; 245 } 246 247 /* Copy the response to the response buffer */ 248 if (cmd->resp_type & MMC_RSP_136) { 249 cmd->response[0] = readl(&mci->rspr); 250 cmd->response[1] = readl(&mci->rspr1); 251 cmd->response[2] = readl(&mci->rspr2); 252 cmd->response[3] = readl(&mci->rspr3); 253 } else 254 cmd->response[0] = readl(&mci->rspr); 255 256 /* transfer all of the blocks */ 257 if (data) { 258 u32 word_count, block_count; 259 u32* ioptr; 260 u32 sys_blocksize, dummy, i; 261 u32 (*mci_data_op) 262 (atmel_mci_t *mci, u32* data, u32 error_flags); 263 264 if (data->flags & MMC_DATA_READ) { 265 mci_data_op = mci_data_read; 266 sys_blocksize = mmc->read_bl_len; 267 ioptr = (u32*)data->dest; 268 } else { 269 mci_data_op = mci_data_write; 270 sys_blocksize = mmc->write_bl_len; 271 ioptr = (u32*)data->src; 272 } 273 274 status = 0; 275 for (block_count = 0; 276 block_count < data->blocks && !status; 277 block_count++) { 278 word_count = 0; 279 do { 280 status = mci_data_op(mci, ioptr, error_flags); 281 word_count++; 282 ioptr++; 283 } while (!status && word_count < (data->blocksize/4)); 284 #ifdef DEBUG 285 if (data->flags & MMC_DATA_READ) 286 { 287 u32 cnt = word_count * 4; 288 printf("Read Data:\n"); 289 print_buffer(0, data->dest + cnt * block_count, 290 1, cnt, 0); 291 } 292 #endif 293 #ifdef DEBUG 294 if (!status && word_count < (sys_blocksize / 4)) 295 printf("filling rest of block...\n"); 296 #endif 297 /* fill the rest of a full block */ 298 while (!status && word_count < (sys_blocksize / 4)) { 299 status = mci_data_op(mci, &dummy, 300 error_flags); 301 word_count++; 302 } 303 if (status) { 304 dump_cmd(cmdr, cmd->cmdarg, status, 305 "Data Transfer Failed"); 306 return -ECOMM; 307 } 308 } 309 310 /* Wait for Transfer End */ 311 i = 0; 312 do { 313 status = readl(&mci->sr); 314 315 if (status & error_flags) { 316 dump_cmd(cmdr, cmd->cmdarg, status, 317 "DTIP Wait Failed"); 318 return -ECOMM; 319 } 320 i++; 321 } while ((status & MMCI_BIT(DTIP)) && i < 10000); 322 if (status & MMCI_BIT(DTIP)) { 323 dump_cmd(cmdr, cmd->cmdarg, status, 324 "XFER DTIP never unset, ignoring"); 325 } 326 } 327 328 /* 329 * After the switch command, wait for 8 clocks before the next 330 * command 331 */ 332 if (cmd->cmdidx == MMC_CMD_SWITCH) 333 udelay(8*1000000 / priv->curr_clk); /* 8 clk in us */ 334 335 return 0; 336 } 337 338 /* Entered into mmc structure during driver init */ 339 static int mci_set_ios(struct mmc *mmc) 340 { 341 struct atmel_mci_priv *priv = mmc->priv; 342 atmel_mci_t *mci = priv->mci; 343 int bus_width = mmc->bus_width; 344 unsigned int version = atmel_mci_get_version(mci); 345 int busw; 346 347 /* Set the clock speed */ 348 mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN); 349 350 /* 351 * set the bus width and select slot for this interface 352 * there is no capability for multiple slots on the same interface yet 353 */ 354 if ((version & 0xf00) >= 0x300) { 355 switch (bus_width) { 356 case 8: 357 busw = 3; 358 break; 359 case 4: 360 busw = 2; 361 break; 362 default: 363 busw = 0; 364 break; 365 } 366 367 writel(busw << 6 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); 368 } else { 369 busw = (bus_width == 4) ? 1 : 0; 370 371 writel(busw << 7 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); 372 } 373 374 return 0; 375 } 376 377 /* Entered into mmc structure during driver init */ 378 static int mci_init(struct mmc *mmc) 379 { 380 struct atmel_mci_priv *priv = mmc->priv; 381 atmel_mci_t *mci = priv->mci; 382 383 /* Initialize controller */ 384 writel(MMCI_BIT(SWRST), &mci->cr); /* soft reset */ 385 writel(MMCI_BIT(PWSDIS), &mci->cr); /* disable power save */ 386 writel(MMCI_BIT(MCIEN), &mci->cr); /* enable mci */ 387 writel(MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); /* select port */ 388 389 /* This delay can be optimized, but stick with max value */ 390 writel(0x7f, &mci->dtor); 391 /* Disable Interrupts */ 392 writel(~0UL, &mci->idr); 393 394 /* Set default clocks and blocklen */ 395 mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN); 396 397 return 0; 398 } 399 400 static const struct mmc_ops atmel_mci_ops = { 401 .send_cmd = mci_send_cmd, 402 .set_ios = mci_set_ios, 403 .init = mci_init, 404 }; 405 406 /* 407 * This is the only exported function 408 * 409 * Call it with the MCI register base address 410 */ 411 int atmel_mci_init(void *regs) 412 { 413 struct mmc *mmc; 414 struct mmc_config *cfg; 415 struct atmel_mci_priv *priv; 416 unsigned int version; 417 418 priv = calloc(1, sizeof(*priv)); 419 if (!priv) 420 return -ENOMEM; 421 422 cfg = &priv->cfg; 423 424 cfg->name = "mci"; 425 cfg->ops = &atmel_mci_ops; 426 427 priv->mci = (struct atmel_mci *)regs; 428 priv->initialized = 0; 429 430 /* need to be able to pass these in on a board by board basis */ 431 cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34; 432 version = atmel_mci_get_version(priv->mci); 433 if ((version & 0xf00) >= 0x300) { 434 cfg->host_caps = MMC_MODE_8BIT; 435 cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz; 436 } 437 438 cfg->host_caps |= MMC_MODE_4BIT; 439 440 /* 441 * min and max frequencies determined by 442 * max and min of clock divider 443 */ 444 cfg->f_min = get_mci_clk_rate() / (2*256); 445 cfg->f_max = get_mci_clk_rate() / (2*1); 446 447 cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT; 448 449 mmc = mmc_create(cfg, priv); 450 451 if (mmc == NULL) { 452 free(priv); 453 return -ENODEV; 454 } 455 /* NOTE: possibly leaking the priv structure */ 456 457 return 0; 458 } 459