1 /* 2 * Marvell MMC/SD/SDIO driver 3 * 4 * Authors: Maen Suleiman, Nicolas Pitre 5 * Copyright (C) 2008-2009 Marvell Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/io.h> 15 #include <linux/platform_device.h> 16 #include <linux/mbus.h> 17 #include <linux/delay.h> 18 #include <linux/interrupt.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/scatterlist.h> 21 #include <linux/irq.h> 22 #include <linux/clk.h> 23 #include <linux/gpio.h> 24 #include <linux/mmc/host.h> 25 26 #include <asm/sizes.h> 27 #include <asm/unaligned.h> 28 #include <linux/platform_data/mmc-mvsdio.h> 29 30 #include "mvsdio.h" 31 32 #define DRIVER_NAME "mvsdio" 33 34 static int maxfreq = MVSD_CLOCKRATE_MAX; 35 static int nodma; 36 37 struct mvsd_host { 38 void __iomem *base; 39 struct mmc_request *mrq; 40 spinlock_t lock; 41 unsigned int xfer_mode; 42 unsigned int intr_en; 43 unsigned int ctrl; 44 unsigned int pio_size; 45 void *pio_ptr; 46 unsigned int sg_frags; 47 unsigned int ns_per_clk; 48 unsigned int clock; 49 unsigned int base_clock; 50 struct timer_list timer; 51 struct mmc_host *mmc; 52 struct device *dev; 53 struct clk *clk; 54 int gpio_card_detect; 55 int gpio_write_protect; 56 }; 57 58 #define mvsd_write(offs, val) writel(val, iobase + (offs)) 59 #define mvsd_read(offs) readl(iobase + (offs)) 60 61 static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data) 62 { 63 void __iomem *iobase = host->base; 64 unsigned int tmout; 65 int tmout_index; 66 67 /* 68 * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE 69 * register is sometimes not set before a while when some 70 * "unusual" data block sizes are used (such as with the SWITCH 71 * command), even despite the fact that the XFER_DONE interrupt 72 * was raised. And if another data transfer starts before 73 * this bit comes to good sense (which eventually happens by 74 * itself) then the new transfer simply fails with a timeout. 75 */ 76 if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) { 77 unsigned long t = jiffies + HZ; 78 unsigned int hw_state, count = 0; 79 do { 80 if (time_after(jiffies, t)) { 81 dev_warn(host->dev, "FIFO_EMPTY bit missing\n"); 82 break; 83 } 84 hw_state = mvsd_read(MVSD_HW_STATE); 85 count++; 86 } while (!(hw_state & (1 << 13))); 87 dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit " 88 "(hw=0x%04x, count=%d, jiffies=%ld)\n", 89 hw_state, count, jiffies - (t - HZ)); 90 } 91 92 /* If timeout=0 then maximum timeout index is used. */ 93 tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk); 94 tmout += data->timeout_clks; 95 tmout_index = fls(tmout - 1) - 12; 96 if (tmout_index < 0) 97 tmout_index = 0; 98 if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX) 99 tmout_index = MVSD_HOST_CTRL_TMOUT_MAX; 100 101 dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n", 102 (data->flags & MMC_DATA_READ) ? "read" : "write", 103 (u32)sg_virt(data->sg), data->blocks, data->blksz, 104 tmout, tmout_index); 105 106 host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK; 107 host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index); 108 mvsd_write(MVSD_HOST_CTRL, host->ctrl); 109 mvsd_write(MVSD_BLK_COUNT, data->blocks); 110 mvsd_write(MVSD_BLK_SIZE, data->blksz); 111 112 if (nodma || (data->blksz | data->sg->offset) & 3) { 113 /* 114 * We cannot do DMA on a buffer which offset or size 115 * is not aligned on a 4-byte boundary. 116 */ 117 host->pio_size = data->blocks * data->blksz; 118 host->pio_ptr = sg_virt(data->sg); 119 if (!nodma) 120 pr_debug("%s: fallback to PIO for data " 121 "at 0x%p size %d\n", 122 mmc_hostname(host->mmc), 123 host->pio_ptr, host->pio_size); 124 return 1; 125 } else { 126 dma_addr_t phys_addr; 127 int dma_dir = (data->flags & MMC_DATA_READ) ? 128 DMA_FROM_DEVICE : DMA_TO_DEVICE; 129 host->sg_frags = dma_map_sg(mmc_dev(host->mmc), data->sg, 130 data->sg_len, dma_dir); 131 phys_addr = sg_dma_address(data->sg); 132 mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff); 133 mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16); 134 return 0; 135 } 136 } 137 138 static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq) 139 { 140 struct mvsd_host *host = mmc_priv(mmc); 141 void __iomem *iobase = host->base; 142 struct mmc_command *cmd = mrq->cmd; 143 u32 cmdreg = 0, xfer = 0, intr = 0; 144 unsigned long flags; 145 146 BUG_ON(host->mrq != NULL); 147 host->mrq = mrq; 148 149 dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n", 150 cmd->opcode, mvsd_read(MVSD_HW_STATE)); 151 152 cmdreg = MVSD_CMD_INDEX(cmd->opcode); 153 154 if (cmd->flags & MMC_RSP_BUSY) 155 cmdreg |= MVSD_CMD_RSP_48BUSY; 156 else if (cmd->flags & MMC_RSP_136) 157 cmdreg |= MVSD_CMD_RSP_136; 158 else if (cmd->flags & MMC_RSP_PRESENT) 159 cmdreg |= MVSD_CMD_RSP_48; 160 else 161 cmdreg |= MVSD_CMD_RSP_NONE; 162 163 if (cmd->flags & MMC_RSP_CRC) 164 cmdreg |= MVSD_CMD_CHECK_CMDCRC; 165 166 if (cmd->flags & MMC_RSP_OPCODE) 167 cmdreg |= MVSD_CMD_INDX_CHECK; 168 169 if (cmd->flags & MMC_RSP_PRESENT) { 170 cmdreg |= MVSD_UNEXPECTED_RESP; 171 intr |= MVSD_NOR_UNEXP_RSP; 172 } 173 174 if (mrq->data) { 175 struct mmc_data *data = mrq->data; 176 int pio; 177 178 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16; 179 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN; 180 if (data->flags & MMC_DATA_READ) 181 xfer |= MVSD_XFER_MODE_TO_HOST; 182 183 pio = mvsd_setup_data(host, data); 184 if (pio) { 185 xfer |= MVSD_XFER_MODE_PIO; 186 /* PIO section of mvsd_irq has comments on those bits */ 187 if (data->flags & MMC_DATA_WRITE) 188 intr |= MVSD_NOR_TX_AVAIL; 189 else if (host->pio_size > 32) 190 intr |= MVSD_NOR_RX_FIFO_8W; 191 else 192 intr |= MVSD_NOR_RX_READY; 193 } 194 195 if (data->stop) { 196 struct mmc_command *stop = data->stop; 197 u32 cmd12reg = 0; 198 199 mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff); 200 mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16); 201 202 if (stop->flags & MMC_RSP_BUSY) 203 cmd12reg |= MVSD_AUTOCMD12_BUSY; 204 if (stop->flags & MMC_RSP_OPCODE) 205 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK; 206 cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode); 207 mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg); 208 209 xfer |= MVSD_XFER_MODE_AUTO_CMD12; 210 intr |= MVSD_NOR_AUTOCMD12_DONE; 211 } else { 212 intr |= MVSD_NOR_XFER_DONE; 213 } 214 } else { 215 intr |= MVSD_NOR_CMD_DONE; 216 } 217 218 mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff); 219 mvsd_write(MVSD_ARG_HI, cmd->arg >> 16); 220 221 spin_lock_irqsave(&host->lock, flags); 222 223 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN; 224 host->xfer_mode |= xfer; 225 mvsd_write(MVSD_XFER_MODE, host->xfer_mode); 226 227 mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT); 228 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); 229 mvsd_write(MVSD_CMD, cmdreg); 230 231 host->intr_en &= MVSD_NOR_CARD_INT; 232 host->intr_en |= intr | MVSD_NOR_ERROR; 233 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); 234 mvsd_write(MVSD_ERR_INTR_EN, 0xffff); 235 236 mod_timer(&host->timer, jiffies + 5 * HZ); 237 238 spin_unlock_irqrestore(&host->lock, flags); 239 } 240 241 static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd, 242 u32 err_status) 243 { 244 void __iomem *iobase = host->base; 245 246 if (cmd->flags & MMC_RSP_136) { 247 unsigned int response[8], i; 248 for (i = 0; i < 8; i++) 249 response[i] = mvsd_read(MVSD_RSP(i)); 250 cmd->resp[0] = ((response[0] & 0x03ff) << 22) | 251 ((response[1] & 0xffff) << 6) | 252 ((response[2] & 0xfc00) >> 10); 253 cmd->resp[1] = ((response[2] & 0x03ff) << 22) | 254 ((response[3] & 0xffff) << 6) | 255 ((response[4] & 0xfc00) >> 10); 256 cmd->resp[2] = ((response[4] & 0x03ff) << 22) | 257 ((response[5] & 0xffff) << 6) | 258 ((response[6] & 0xfc00) >> 10); 259 cmd->resp[3] = ((response[6] & 0x03ff) << 22) | 260 ((response[7] & 0x3fff) << 8); 261 } else if (cmd->flags & MMC_RSP_PRESENT) { 262 unsigned int response[3], i; 263 for (i = 0; i < 3; i++) 264 response[i] = mvsd_read(MVSD_RSP(i)); 265 cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) | 266 ((response[1] & 0xffff) << (14 - 8)) | 267 ((response[0] & 0x03ff) << (30 - 8)); 268 cmd->resp[1] = ((response[0] & 0xfc00) >> 10); 269 cmd->resp[2] = 0; 270 cmd->resp[3] = 0; 271 } 272 273 if (err_status & MVSD_ERR_CMD_TIMEOUT) { 274 cmd->error = -ETIMEDOUT; 275 } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT | 276 MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) { 277 cmd->error = -EILSEQ; 278 } 279 err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC | 280 MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX | 281 MVSD_ERR_CMD_STARTBIT); 282 283 return err_status; 284 } 285 286 static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data, 287 u32 err_status) 288 { 289 void __iomem *iobase = host->base; 290 291 if (host->pio_ptr) { 292 host->pio_ptr = NULL; 293 host->pio_size = 0; 294 } else { 295 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags, 296 (data->flags & MMC_DATA_READ) ? 297 DMA_FROM_DEVICE : DMA_TO_DEVICE); 298 } 299 300 if (err_status & MVSD_ERR_DATA_TIMEOUT) 301 data->error = -ETIMEDOUT; 302 else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT)) 303 data->error = -EILSEQ; 304 else if (err_status & MVSD_ERR_XFER_SIZE) 305 data->error = -EBADE; 306 err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC | 307 MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE); 308 309 dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n", 310 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT)); 311 data->bytes_xfered = 312 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz; 313 /* We can't be sure about the last block when errors are detected */ 314 if (data->bytes_xfered && data->error) 315 data->bytes_xfered -= data->blksz; 316 317 /* Handle Auto cmd 12 response */ 318 if (data->stop) { 319 unsigned int response[3], i; 320 for (i = 0; i < 3; i++) 321 response[i] = mvsd_read(MVSD_AUTO_RSP(i)); 322 data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) | 323 ((response[1] & 0xffff) << (14 - 8)) | 324 ((response[0] & 0x03ff) << (30 - 8)); 325 data->stop->resp[1] = ((response[0] & 0xfc00) >> 10); 326 data->stop->resp[2] = 0; 327 data->stop->resp[3] = 0; 328 329 if (err_status & MVSD_ERR_AUTOCMD12) { 330 u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS); 331 dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12); 332 if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE) 333 data->stop->error = -ENOEXEC; 334 else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT) 335 data->stop->error = -ETIMEDOUT; 336 else if (err_cmd12) 337 data->stop->error = -EILSEQ; 338 err_status &= ~MVSD_ERR_AUTOCMD12; 339 } 340 } 341 342 return err_status; 343 } 344 345 static irqreturn_t mvsd_irq(int irq, void *dev) 346 { 347 struct mvsd_host *host = dev; 348 void __iomem *iobase = host->base; 349 u32 intr_status, intr_done_mask; 350 int irq_handled = 0; 351 352 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); 353 dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n", 354 intr_status, mvsd_read(MVSD_NOR_INTR_EN), 355 mvsd_read(MVSD_HW_STATE)); 356 357 spin_lock(&host->lock); 358 359 /* PIO handling, if needed. Messy business... */ 360 if (host->pio_size && 361 (intr_status & host->intr_en & 362 (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) { 363 u16 *p = host->pio_ptr; 364 int s = host->pio_size; 365 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) { 366 readsw(iobase + MVSD_FIFO, p, 16); 367 p += 16; 368 s -= 32; 369 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); 370 } 371 /* 372 * Normally we'd use < 32 here, but the RX_FIFO_8W bit 373 * doesn't appear to assert when there is exactly 32 bytes 374 * (8 words) left to fetch in a transfer. 375 */ 376 if (s <= 32) { 377 while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) { 378 put_unaligned(mvsd_read(MVSD_FIFO), p++); 379 put_unaligned(mvsd_read(MVSD_FIFO), p++); 380 s -= 4; 381 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); 382 } 383 if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) { 384 u16 val[2] = {0, 0}; 385 val[0] = mvsd_read(MVSD_FIFO); 386 val[1] = mvsd_read(MVSD_FIFO); 387 memcpy(p, ((void *)&val) + 4 - s, s); 388 s = 0; 389 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); 390 } 391 if (s == 0) { 392 host->intr_en &= 393 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W); 394 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); 395 } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) { 396 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W; 397 host->intr_en |= MVSD_NOR_RX_READY; 398 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); 399 } 400 } 401 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n", 402 s, intr_status, mvsd_read(MVSD_HW_STATE)); 403 host->pio_ptr = p; 404 host->pio_size = s; 405 irq_handled = 1; 406 } else if (host->pio_size && 407 (intr_status & host->intr_en & 408 (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) { 409 u16 *p = host->pio_ptr; 410 int s = host->pio_size; 411 /* 412 * The TX_FIFO_8W bit is unreliable. When set, bursting 413 * 16 halfwords all at once in the FIFO drops data. Actually 414 * TX_AVAIL does go off after only one word is pushed even if 415 * TX_FIFO_8W remains set. 416 */ 417 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) { 418 mvsd_write(MVSD_FIFO, get_unaligned(p++)); 419 mvsd_write(MVSD_FIFO, get_unaligned(p++)); 420 s -= 4; 421 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); 422 } 423 if (s < 4) { 424 if (s && (intr_status & MVSD_NOR_TX_AVAIL)) { 425 u16 val[2] = {0, 0}; 426 memcpy(((void *)&val) + 4 - s, p, s); 427 mvsd_write(MVSD_FIFO, val[0]); 428 mvsd_write(MVSD_FIFO, val[1]); 429 s = 0; 430 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); 431 } 432 if (s == 0) { 433 host->intr_en &= 434 ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W); 435 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); 436 } 437 } 438 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n", 439 s, intr_status, mvsd_read(MVSD_HW_STATE)); 440 host->pio_ptr = p; 441 host->pio_size = s; 442 irq_handled = 1; 443 } 444 445 mvsd_write(MVSD_NOR_INTR_STATUS, intr_status); 446 447 intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY | 448 MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W; 449 if (intr_status & host->intr_en & ~intr_done_mask) { 450 struct mmc_request *mrq = host->mrq; 451 struct mmc_command *cmd = mrq->cmd; 452 u32 err_status = 0; 453 454 del_timer(&host->timer); 455 host->mrq = NULL; 456 457 host->intr_en &= MVSD_NOR_CARD_INT; 458 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); 459 mvsd_write(MVSD_ERR_INTR_EN, 0); 460 461 spin_unlock(&host->lock); 462 463 if (intr_status & MVSD_NOR_UNEXP_RSP) { 464 cmd->error = -EPROTO; 465 } else if (intr_status & MVSD_NOR_ERROR) { 466 err_status = mvsd_read(MVSD_ERR_INTR_STATUS); 467 dev_dbg(host->dev, "err 0x%04x\n", err_status); 468 } 469 470 err_status = mvsd_finish_cmd(host, cmd, err_status); 471 if (mrq->data) 472 err_status = mvsd_finish_data(host, mrq->data, err_status); 473 if (err_status) { 474 pr_err("%s: unhandled error status %#04x\n", 475 mmc_hostname(host->mmc), err_status); 476 cmd->error = -ENOMSG; 477 } 478 479 mmc_request_done(host->mmc, mrq); 480 irq_handled = 1; 481 } else 482 spin_unlock(&host->lock); 483 484 if (intr_status & MVSD_NOR_CARD_INT) { 485 mmc_signal_sdio_irq(host->mmc); 486 irq_handled = 1; 487 } 488 489 if (irq_handled) 490 return IRQ_HANDLED; 491 492 pr_err("%s: unhandled interrupt status=0x%04x en=0x%04x " 493 "pio=%d\n", mmc_hostname(host->mmc), intr_status, 494 host->intr_en, host->pio_size); 495 return IRQ_NONE; 496 } 497 498 static void mvsd_timeout_timer(unsigned long data) 499 { 500 struct mvsd_host *host = (struct mvsd_host *)data; 501 void __iomem *iobase = host->base; 502 struct mmc_request *mrq; 503 unsigned long flags; 504 505 spin_lock_irqsave(&host->lock, flags); 506 mrq = host->mrq; 507 if (mrq) { 508 pr_err("%s: Timeout waiting for hardware interrupt.\n", 509 mmc_hostname(host->mmc)); 510 pr_err("%s: hw_state=0x%04x, intr_status=0x%04x " 511 "intr_en=0x%04x\n", mmc_hostname(host->mmc), 512 mvsd_read(MVSD_HW_STATE), 513 mvsd_read(MVSD_NOR_INTR_STATUS), 514 mvsd_read(MVSD_NOR_INTR_EN)); 515 516 host->mrq = NULL; 517 518 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW); 519 520 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN; 521 mvsd_write(MVSD_XFER_MODE, host->xfer_mode); 522 523 host->intr_en &= MVSD_NOR_CARD_INT; 524 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); 525 mvsd_write(MVSD_ERR_INTR_EN, 0); 526 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); 527 528 mrq->cmd->error = -ETIMEDOUT; 529 mvsd_finish_cmd(host, mrq->cmd, 0); 530 if (mrq->data) { 531 mrq->data->error = -ETIMEDOUT; 532 mvsd_finish_data(host, mrq->data, 0); 533 } 534 } 535 spin_unlock_irqrestore(&host->lock, flags); 536 537 if (mrq) 538 mmc_request_done(host->mmc, mrq); 539 } 540 541 static irqreturn_t mvsd_card_detect_irq(int irq, void *dev) 542 { 543 struct mvsd_host *host = dev; 544 mmc_detect_change(host->mmc, msecs_to_jiffies(100)); 545 return IRQ_HANDLED; 546 } 547 548 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable) 549 { 550 struct mvsd_host *host = mmc_priv(mmc); 551 void __iomem *iobase = host->base; 552 unsigned long flags; 553 554 spin_lock_irqsave(&host->lock, flags); 555 if (enable) { 556 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN; 557 host->intr_en |= MVSD_NOR_CARD_INT; 558 } else { 559 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN; 560 host->intr_en &= ~MVSD_NOR_CARD_INT; 561 } 562 mvsd_write(MVSD_XFER_MODE, host->xfer_mode); 563 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); 564 spin_unlock_irqrestore(&host->lock, flags); 565 } 566 567 static int mvsd_get_ro(struct mmc_host *mmc) 568 { 569 struct mvsd_host *host = mmc_priv(mmc); 570 571 if (host->gpio_write_protect) 572 return gpio_get_value(host->gpio_write_protect); 573 574 /* 575 * Board doesn't support read only detection; let the mmc core 576 * decide what to do. 577 */ 578 return -ENOSYS; 579 } 580 581 static void mvsd_power_up(struct mvsd_host *host) 582 { 583 void __iomem *iobase = host->base; 584 dev_dbg(host->dev, "power up\n"); 585 mvsd_write(MVSD_NOR_INTR_EN, 0); 586 mvsd_write(MVSD_ERR_INTR_EN, 0); 587 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW); 588 mvsd_write(MVSD_XFER_MODE, 0); 589 mvsd_write(MVSD_NOR_STATUS_EN, 0xffff); 590 mvsd_write(MVSD_ERR_STATUS_EN, 0xffff); 591 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff); 592 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); 593 } 594 595 static void mvsd_power_down(struct mvsd_host *host) 596 { 597 void __iomem *iobase = host->base; 598 dev_dbg(host->dev, "power down\n"); 599 mvsd_write(MVSD_NOR_INTR_EN, 0); 600 mvsd_write(MVSD_ERR_INTR_EN, 0); 601 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW); 602 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK); 603 mvsd_write(MVSD_NOR_STATUS_EN, 0); 604 mvsd_write(MVSD_ERR_STATUS_EN, 0); 605 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff); 606 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); 607 } 608 609 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 610 { 611 struct mvsd_host *host = mmc_priv(mmc); 612 void __iomem *iobase = host->base; 613 u32 ctrl_reg = 0; 614 615 if (ios->power_mode == MMC_POWER_UP) 616 mvsd_power_up(host); 617 618 if (ios->clock == 0) { 619 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK); 620 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX); 621 host->clock = 0; 622 dev_dbg(host->dev, "clock off\n"); 623 } else if (ios->clock != host->clock) { 624 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1; 625 if (m > MVSD_BASE_DIV_MAX) 626 m = MVSD_BASE_DIV_MAX; 627 mvsd_write(MVSD_CLK_DIV, m); 628 host->clock = ios->clock; 629 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1)); 630 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n", 631 ios->clock, host->base_clock / (m+1), m); 632 } 633 634 /* default transfer mode */ 635 ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN; 636 ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST; 637 638 /* default to maximum timeout */ 639 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK; 640 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN; 641 642 if (ios->bus_mode == MMC_BUSMODE_PUSHPULL) 643 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN; 644 645 if (ios->bus_width == MMC_BUS_WIDTH_4) 646 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS; 647 648 /* 649 * The HI_SPEED_EN bit is causing trouble with many (but not all) 650 * high speed SD, SDHC and SDIO cards. Not enabling that bit 651 * makes all cards work. So let's just ignore that bit for now 652 * and revisit this issue if problems for not enabling this bit 653 * are ever reported. 654 */ 655 #if 0 656 if (ios->timing == MMC_TIMING_MMC_HS || 657 ios->timing == MMC_TIMING_SD_HS) 658 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN; 659 #endif 660 661 host->ctrl = ctrl_reg; 662 mvsd_write(MVSD_HOST_CTRL, ctrl_reg); 663 dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg, 664 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ? 665 "push-pull" : "open-drain", 666 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ? 667 "4bit-width" : "1bit-width", 668 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ? 669 "high-speed" : ""); 670 671 if (ios->power_mode == MMC_POWER_OFF) 672 mvsd_power_down(host); 673 } 674 675 static const struct mmc_host_ops mvsd_ops = { 676 .request = mvsd_request, 677 .get_ro = mvsd_get_ro, 678 .set_ios = mvsd_set_ios, 679 .enable_sdio_irq = mvsd_enable_sdio_irq, 680 }; 681 682 static void __init 683 mv_conf_mbus_windows(struct mvsd_host *host, 684 const struct mbus_dram_target_info *dram) 685 { 686 void __iomem *iobase = host->base; 687 int i; 688 689 for (i = 0; i < 4; i++) { 690 writel(0, iobase + MVSD_WINDOW_CTRL(i)); 691 writel(0, iobase + MVSD_WINDOW_BASE(i)); 692 } 693 694 for (i = 0; i < dram->num_cs; i++) { 695 const struct mbus_dram_window *cs = dram->cs + i; 696 writel(((cs->size - 1) & 0xffff0000) | 697 (cs->mbus_attr << 8) | 698 (dram->mbus_dram_target_id << 4) | 1, 699 iobase + MVSD_WINDOW_CTRL(i)); 700 writel(cs->base, iobase + MVSD_WINDOW_BASE(i)); 701 } 702 } 703 704 static int __init mvsd_probe(struct platform_device *pdev) 705 { 706 struct mmc_host *mmc = NULL; 707 struct mvsd_host *host = NULL; 708 const struct mvsdio_platform_data *mvsd_data; 709 const struct mbus_dram_target_info *dram; 710 struct resource *r; 711 int ret, irq; 712 713 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 714 irq = platform_get_irq(pdev, 0); 715 mvsd_data = pdev->dev.platform_data; 716 if (!r || irq < 0 || !mvsd_data) 717 return -ENXIO; 718 719 mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev); 720 if (!mmc) { 721 ret = -ENOMEM; 722 goto out; 723 } 724 725 host = mmc_priv(mmc); 726 host->mmc = mmc; 727 host->dev = &pdev->dev; 728 host->base_clock = mvsd_data->clock / 2; 729 host->clk = ERR_PTR(-EINVAL); 730 731 mmc->ops = &mvsd_ops; 732 733 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 734 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ | 735 MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; 736 737 mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX); 738 mmc->f_max = maxfreq; 739 740 mmc->max_blk_size = 2048; 741 mmc->max_blk_count = 65535; 742 743 mmc->max_segs = 1; 744 mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count; 745 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 746 747 spin_lock_init(&host->lock); 748 749 host->base = devm_request_and_ioremap(&pdev->dev, r); 750 if (!host->base) { 751 ret = -ENOMEM; 752 goto out; 753 } 754 755 /* (Re-)program MBUS remapping windows if we are asked to. */ 756 dram = mv_mbus_dram_info(); 757 if (dram) 758 mv_conf_mbus_windows(host, dram); 759 760 mvsd_power_down(host); 761 762 ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host); 763 if (ret) { 764 pr_err("%s: cannot assign irq %d\n", DRIVER_NAME, irq); 765 goto out; 766 } 767 768 /* Not all platforms can gate the clock, so it is not 769 an error if the clock does not exists. */ 770 host->clk = devm_clk_get(&pdev->dev, NULL); 771 if (!IS_ERR(host->clk)) 772 clk_prepare_enable(host->clk); 773 774 if (mvsd_data->gpio_card_detect) { 775 ret = devm_gpio_request_one(&pdev->dev, 776 mvsd_data->gpio_card_detect, 777 GPIOF_IN, DRIVER_NAME " cd"); 778 if (ret == 0) { 779 irq = gpio_to_irq(mvsd_data->gpio_card_detect); 780 ret = devm_request_irq(&pdev->dev, irq, 781 mvsd_card_detect_irq, 782 IRQ_TYPE_EDGE_RISING | 783 IRQ_TYPE_EDGE_FALLING, 784 DRIVER_NAME " cd", host); 785 if (ret == 0) 786 host->gpio_card_detect = 787 mvsd_data->gpio_card_detect; 788 else 789 devm_gpio_free(&pdev->dev, 790 mvsd_data->gpio_card_detect); 791 } 792 } 793 if (!host->gpio_card_detect) 794 mmc->caps |= MMC_CAP_NEEDS_POLL; 795 796 if (mvsd_data->gpio_write_protect) { 797 ret = devm_gpio_request_one(&pdev->dev, 798 mvsd_data->gpio_write_protect, 799 GPIOF_IN, DRIVER_NAME " wp"); 800 if (ret == 0) { 801 host->gpio_write_protect = 802 mvsd_data->gpio_write_protect; 803 } 804 } 805 806 setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host); 807 platform_set_drvdata(pdev, mmc); 808 ret = mmc_add_host(mmc); 809 if (ret) 810 goto out; 811 812 pr_notice("%s: %s driver initialized, ", 813 mmc_hostname(mmc), DRIVER_NAME); 814 if (host->gpio_card_detect) 815 printk("using GPIO %d for card detection\n", 816 host->gpio_card_detect); 817 else 818 printk("lacking card detect (fall back to polling)\n"); 819 return 0; 820 821 out: 822 if (mmc) { 823 if (!IS_ERR(host->clk)) 824 clk_disable_unprepare(host->clk); 825 mmc_free_host(mmc); 826 } 827 828 return ret; 829 } 830 831 static int __exit mvsd_remove(struct platform_device *pdev) 832 { 833 struct mmc_host *mmc = platform_get_drvdata(pdev); 834 835 struct mvsd_host *host = mmc_priv(mmc); 836 837 mmc_remove_host(mmc); 838 del_timer_sync(&host->timer); 839 mvsd_power_down(host); 840 841 if (!IS_ERR(host->clk)) 842 clk_disable_unprepare(host->clk); 843 mmc_free_host(mmc); 844 845 platform_set_drvdata(pdev, NULL); 846 return 0; 847 } 848 849 #ifdef CONFIG_PM 850 static int mvsd_suspend(struct platform_device *dev, pm_message_t state) 851 { 852 struct mmc_host *mmc = platform_get_drvdata(dev); 853 int ret = 0; 854 855 if (mmc) 856 ret = mmc_suspend_host(mmc); 857 858 return ret; 859 } 860 861 static int mvsd_resume(struct platform_device *dev) 862 { 863 struct mmc_host *mmc = platform_get_drvdata(dev); 864 int ret = 0; 865 866 if (mmc) 867 ret = mmc_resume_host(mmc); 868 869 return ret; 870 } 871 #else 872 #define mvsd_suspend NULL 873 #define mvsd_resume NULL 874 #endif 875 876 static struct platform_driver mvsd_driver = { 877 .remove = __exit_p(mvsd_remove), 878 .suspend = mvsd_suspend, 879 .resume = mvsd_resume, 880 .driver = { 881 .name = DRIVER_NAME, 882 }, 883 }; 884 885 static int __init mvsd_init(void) 886 { 887 return platform_driver_probe(&mvsd_driver, mvsd_probe); 888 } 889 890 static void __exit mvsd_exit(void) 891 { 892 platform_driver_unregister(&mvsd_driver); 893 } 894 895 module_init(mvsd_init); 896 module_exit(mvsd_exit); 897 898 /* maximum card clock frequency (default 50MHz) */ 899 module_param(maxfreq, int, 0); 900 901 /* force PIO transfers all the time */ 902 module_param(nodma, int, 0); 903 904 MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre"); 905 MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver"); 906 MODULE_LICENSE("GPL"); 907 MODULE_ALIAS("platform:mvsdio"); 908