drivers/staging/goldfish/goldfish_nand.c

   1 /*
   2  * drivers/mtd/devices/goldfish_nand.c
   3  *
   4  * Copyright (C) 2007 Google, Inc.
   5  * Copyright (C) 2012 Intel, Inc.
   6  * Copyright (C) 2013 Intel, Inc.
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/io.h>
  20 #include <linux/device.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/ioport.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/mutex.h>
  28 #include <linux/goldfish.h>
  29 #include <asm/div64.h>
  30 #include <linux/dma-mapping.h>
  31
  32 #include "goldfish_nand_reg.h"
  33
  34 struct goldfish_nand {
  35         /* lock protects access to the device registers */
  36         struct mutex            lock;
  37         unsigned char __iomem  *base;
  38         struct cmd_params       *cmd_params;
  39         size_t                  mtd_count;
  40         struct mtd_info         mtd[0];
  41 };
  42
  43 static u32 goldfish_nand_cmd_with_params(struct mtd_info *mtd,
  44                                          enum nand_cmd cmd, u64 addr, u32 len,
  45                                          void *ptr, u32 *rv)
  46 {
  47         u32 cmdp;
  48         struct goldfish_nand *nand = mtd->priv;
  49         struct cmd_params *cps = nand->cmd_params;
  50         unsigned char __iomem  *base = nand->base;
  51
  52         if (!cps)
  53                 return -1;
  54
  55         switch (cmd) {
  56         case NAND_CMD_ERASE:
  57                 cmdp = NAND_CMD_ERASE_WITH_PARAMS;
  58                 break;
  59         case NAND_CMD_READ:
  60                 cmdp = NAND_CMD_READ_WITH_PARAMS;
  61                 break;
  62         case NAND_CMD_WRITE:
  63                 cmdp = NAND_CMD_WRITE_WITH_PARAMS;
  64                 break;
  65         default:
  66                 return -1;
  67         }
  68         cps->dev = mtd - nand->mtd;
  69         cps->addr_high = (u32)(addr >> 32);
  70         cps->addr_low = (u32)addr;
  71         cps->transfer_size = len;
  72         cps->data = (unsigned long)ptr;
  73         writel(cmdp, base + NAND_COMMAND);
  74         *rv = cps->result;
  75         return 0;
  76 }
  77
  78 static u32 goldfish_nand_cmd(struct mtd_info *mtd, enum nand_cmd cmd,
  79                              u64 addr, u32 len, void *ptr)
  80 {
  81         struct goldfish_nand *nand = mtd->priv;
  82         u32 rv;
  83         unsigned char __iomem  *base = nand->base;
  84
  85         mutex_lock(&nand->lock);
  86         if (goldfish_nand_cmd_with_params(mtd, cmd, addr, len, ptr, &rv)) {
  87                 writel(mtd - nand->mtd, base + NAND_DEV);
  88                 writel((u32)(addr >> 32), base + NAND_ADDR_HIGH);
  89                 writel((u32)addr, base + NAND_ADDR_LOW);
  90                 writel(len, base + NAND_TRANSFER_SIZE);
  91                 gf_write_ptr(ptr, base + NAND_DATA, base + NAND_DATA_HIGH);
  92                 writel(cmd, base + NAND_COMMAND);
  93                 rv = readl(base + NAND_RESULT);
  94         }
  95         mutex_unlock(&nand->lock);
  96         return rv;
  97 }
  98
  99 static int goldfish_nand_erase(struct mtd_info *mtd, struct erase_info *instr)
 100 {
 101         loff_t ofs = instr->addr;
 102         u32 len = instr->len;
 103         s32 rem;
 104
 105         if (ofs + len > mtd->size)
 106                 goto invalid_arg;
 107         ofs = div_s64_rem(ofs, mtd->writesize, &rem);
 108         if (rem)
 109                 goto invalid_arg;
 110         ofs *= (mtd->writesize + mtd->oobsize);
 111
 112         if (len % mtd->writesize)
 113                 goto invalid_arg;
 114         len = len / mtd->writesize * (mtd->writesize + mtd->oobsize);
 115
 116         if (goldfish_nand_cmd(mtd, NAND_CMD_ERASE, ofs, len, NULL) != len) {
 117                 pr_err("goldfish_nand_erase: erase failed, start %llx, len %x, dev_size %llx, erase_size %x\n",
 118                        ofs, len, mtd->size, mtd->erasesize);
 119                 return -EIO;
 120         }
 121
 122         instr->state = MTD_ERASE_DONE;
 123         mtd_erase_callback(instr);
 124
 125         return 0;
 126
 127 invalid_arg:
 128         pr_err("goldfish_nand_erase: invalid erase, start %llx, len %x, dev_size %llx, erase_size %x\n",
 129                ofs, len, mtd->size, mtd->erasesize);
 130         return -EINVAL;
 131 }
 132
 133 static int goldfish_nand_read_oob(struct mtd_info *mtd, loff_t ofs,
 134                                   struct mtd_oob_ops *ops)
 135 {
 136         s32 rem;
 137
 138         if (ofs + ops->len > mtd->size)
 139                 goto invalid_arg;
 140         if (ops->datbuf && ops->len && ops->len != mtd->writesize)
 141                 goto invalid_arg;
 142         if (ops->ooblen + ops->ooboffs > mtd->oobsize)
 143                 goto invalid_arg;
 144
 145         ofs = div_s64_rem(ofs, mtd->writesize, &rem);
 146         if (rem)
 147                 goto invalid_arg;
 148         ofs *= (mtd->writesize + mtd->oobsize);
 149
 150         if (ops->datbuf)
 151                 ops->retlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, ofs,
 152                                                 ops->len, ops->datbuf);
 153         ofs += mtd->writesize + ops->ooboffs;
 154         if (ops->oobbuf)
 155                 ops->oobretlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, ofs,
 156                                                 ops->ooblen, ops->oobbuf);
 157         return 0;
 158
 159 invalid_arg:
 160         pr_err("goldfish_nand_read_oob: invalid read, start %llx, len %zx, ooblen %zx, dev_size %llx, write_size %x\n",
 161                ofs, ops->len, ops->ooblen, mtd->size, mtd->writesize);
 162         return -EINVAL;
 163 }
 164
 165 static int goldfish_nand_write_oob(struct mtd_info *mtd, loff_t ofs,
 166                                    struct mtd_oob_ops *ops)
 167 {
 168         s32 rem;
 169
 170         if (ofs + ops->len > mtd->size)
 171                 goto invalid_arg;
 172         if (ops->len && ops->len != mtd->writesize)
 173                 goto invalid_arg;
 174         if (ops->ooblen + ops->ooboffs > mtd->oobsize)
 175                 goto invalid_arg;
 176
 177         ofs = div_s64_rem(ofs, mtd->writesize, &rem);
 178         if (rem)
 179                 goto invalid_arg;
 180         ofs *= (mtd->writesize + mtd->oobsize);
 181
 182         if (ops->datbuf)
 183                 ops->retlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, ofs,
 184                                                 ops->len, ops->datbuf);
 185         ofs += mtd->writesize + ops->ooboffs;
 186         if (ops->oobbuf)
 187                 ops->oobretlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, ofs,
 188                                                 ops->ooblen, ops->oobbuf);
 189         return 0;
 190
 191 invalid_arg:
 192         pr_err("goldfish_nand_write_oob: invalid write, start %llx, len %zx, ooblen %zx, dev_size %llx, write_size %x\n",
 193                ofs, ops->len, ops->ooblen, mtd->size, mtd->writesize);
 194         return -EINVAL;
 195 }
 196
 197 static int goldfish_nand_read(struct mtd_info *mtd, loff_t from, size_t len,
 198                               size_t *retlen, u_char *buf)
 199 {
 200         s32 rem;
 201
 202         if (from + len > mtd->size)
 203                 goto invalid_arg;
 204
 205         from = div_s64_rem(from, mtd->writesize, &rem);
 206         if (rem)
 207                 goto invalid_arg;
 208         from *= (mtd->writesize + mtd->oobsize);
 209
 210         *retlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, from, len, buf);
 211         return 0;
 212
 213 invalid_arg:
 214         pr_err("goldfish_nand_read: invalid read, start %llx, len %zx, dev_size %llx, write_size %x\n",
 215                from, len, mtd->size, mtd->writesize);
 216         return -EINVAL;
 217 }
 218
 219 static int goldfish_nand_write(struct mtd_info *mtd, loff_t to, size_t len,
 220                                size_t *retlen, const u_char *buf)
 221 {
 222         s32 rem;
 223
 224         if (to + len > mtd->size)
 225                 goto invalid_arg;
 226
 227         to = div_s64_rem(to, mtd->writesize, &rem);
 228         if (rem)
 229                 goto invalid_arg;
 230         to *= (mtd->writesize + mtd->oobsize);
 231
 232         *retlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, to, len, (void *)buf);
 233         return 0;
 234
 235 invalid_arg:
 236         pr_err("goldfish_nand_write: invalid write, start %llx, len %zx, dev_size %llx, write_size %x\n",
 237                to, len, mtd->size, mtd->writesize);
 238         return -EINVAL;
 239 }
 240
 241 static int goldfish_nand_block_isbad(struct mtd_info *mtd, loff_t ofs)
 242 {
 243         s32 rem;
 244
 245         if (ofs >= mtd->size)
 246                 goto invalid_arg;
 247
 248         ofs = div_s64_rem(ofs, mtd->writesize, &rem);
 249         if (rem)
 250                 goto invalid_arg;
 251         ofs *= mtd->erasesize / mtd->writesize;
 252         ofs *= (mtd->writesize + mtd->oobsize);
 253
 254         return goldfish_nand_cmd(mtd, NAND_CMD_BLOCK_BAD_GET, ofs, 0, NULL);
 255
 256 invalid_arg:
 257         pr_err("goldfish_nand_block_isbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",
 258                ofs, mtd->size, mtd->writesize);
 259         return -EINVAL;
 260 }
 261
 262 static int goldfish_nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
 263 {
 264         s32 rem;
 265
 266         if (ofs >= mtd->size)
 267                 goto invalid_arg;
 268
 269         ofs = div_s64_rem(ofs, mtd->writesize, &rem);
 270         if (rem)
 271                 goto invalid_arg;
 272         ofs *= mtd->erasesize / mtd->writesize;
 273         ofs *= (mtd->writesize + mtd->oobsize);
 274
 275         if (goldfish_nand_cmd(mtd, NAND_CMD_BLOCK_BAD_SET, ofs, 0, NULL) != 1)
 276                 return -EIO;
 277         return 0;
 278
 279 invalid_arg:
 280         pr_err("goldfish_nand_block_markbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",
 281                ofs, mtd->size, mtd->writesize);
 282         return -EINVAL;
 283 }
 284
 285 static int nand_setup_cmd_params(struct platform_device *pdev,
 286                                  struct goldfish_nand *nand)
 287 {
 288         dma_addr_t dma_handle;
 289         unsigned char __iomem  *base = nand->base;
 290
 291         nand->cmd_params = dmam_alloc_coherent(&pdev->dev,
 292                                                sizeof(struct cmd_params),
 293                                                &dma_handle, GFP_KERNEL);
 294         if (!nand->cmd_params) {
 295                 dev_err(&pdev->dev, "allocate buffer failed\n");
 296                 return -ENOMEM;
 297         }
 298         writel((u32)((u64)dma_handle >> 32), base + NAND_CMD_PARAMS_ADDR_HIGH);
 299         writel((u32)dma_handle, base + NAND_CMD_PARAMS_ADDR_LOW);
 300         return 0;
 301 }
 302
 303 static int goldfish_nand_init_device(struct platform_device *pdev,
 304                                      struct goldfish_nand *nand, int id)
 305 {
 306         u32 name_len;
 307         u32 result;
 308         u32 flags;
 309         unsigned char __iomem  *base = nand->base;
 310         struct mtd_info *mtd = &nand->mtd[id];
 311         char *name;
 312
 313         mutex_lock(&nand->lock);
 314         writel(id, base + NAND_DEV);
 315         flags = readl(base + NAND_DEV_FLAGS);
 316         name_len = readl(base + NAND_DEV_NAME_LEN);
 317         mtd->writesize = readl(base + NAND_DEV_PAGE_SIZE);
 318         mtd->size = readl(base + NAND_DEV_SIZE_LOW);
 319         mtd->size |= (u64)readl(base + NAND_DEV_SIZE_HIGH) << 32;
 320         mtd->oobsize = readl(base + NAND_DEV_EXTRA_SIZE);
 321         mtd->oobavail = mtd->oobsize;
 322         mtd->erasesize = readl(base + NAND_DEV_ERASE_SIZE) /
 323                         (mtd->writesize + mtd->oobsize) * mtd->writesize;
 324         mtd->size = div_s64(mtd->size, mtd->writesize + mtd->oobsize);
 325         mtd->size *= mtd->writesize;
 326         dev_dbg(&pdev->dev,
 327                 "goldfish nand dev%d: size %llx, page %d, extra %d, erase %d\n",
 328                        id, mtd->size, mtd->writesize,
 329                        mtd->oobsize, mtd->erasesize);
 330         mutex_unlock(&nand->lock);
 331
 332         mtd->priv = nand;
 333
 334         name = devm_kzalloc(&pdev->dev, name_len + 1, GFP_KERNEL);
 335         if (!name)
 336                 return -ENOMEM;
 337         mtd->name = name;
 338
 339         result = goldfish_nand_cmd(mtd, NAND_CMD_GET_DEV_NAME, 0, name_len,
 340                                    name);
 341         if (result != name_len) {
 342                 dev_err(&pdev->dev,
 343                         "goldfish_nand_init_device failed to get dev name %d != %d\n",
 344                                result, name_len);
 345                 return -ENODEV;
 346         }
 347         ((char *)mtd->name)[name_len] = '\0';
 348
 349         /* Setup the MTD structure */
 350         mtd->type = MTD_NANDFLASH;
 351         mtd->flags = MTD_CAP_NANDFLASH;
 352         if (flags & NAND_DEV_FLAG_READ_ONLY)
 353                 mtd->flags &= ~MTD_WRITEABLE;
 354         if (flags & NAND_DEV_FLAG_CMD_PARAMS_CAP)
 355                 nand_setup_cmd_params(pdev, nand);
 356
 357         mtd->owner = THIS_MODULE;
 358         mtd->_erase = goldfish_nand_erase;
 359         mtd->_read = goldfish_nand_read;
 360         mtd->_write = goldfish_nand_write;
 361         mtd->_read_oob = goldfish_nand_read_oob;
 362         mtd->_write_oob = goldfish_nand_write_oob;
 363         mtd->_block_isbad = goldfish_nand_block_isbad;
 364         mtd->_block_markbad = goldfish_nand_block_markbad;
 365
 366         if (mtd_device_register(mtd, NULL, 0))
 367                 return -EIO;
 368
 369         return 0;
 370 }
 371
 372 static int goldfish_nand_probe(struct platform_device *pdev)
 373 {
 374         u32 num_dev;
 375         int i;
 376         int err;
 377         u32 num_dev_working;
 378         u32 version;
 379         struct resource *r;
 380         struct goldfish_nand *nand;
 381         unsigned char __iomem  *base;
 382
 383         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 384         if (!r)
 385                 return -ENODEV;
 386
 387         base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
 388         if (!base)
 389                 return -ENOMEM;
 390
 391         version = readl(base + NAND_VERSION);
 392         if (version != NAND_VERSION_CURRENT) {
 393                 dev_err(&pdev->dev,
 394                         "goldfish_nand_init: version mismatch, got %d, expected %d\n",
 395                                 version, NAND_VERSION_CURRENT);
 396                 return -ENODEV;
 397         }
 398         num_dev = readl(base + NAND_NUM_DEV);
 399         if (num_dev == 0)
 400                 return -ENODEV;
 401
 402         nand = devm_kzalloc(&pdev->dev, sizeof(*nand) +
 403                                 sizeof(struct mtd_info) * num_dev, GFP_KERNEL);
 404         if (!nand)
 405                 return -ENOMEM;
 406
 407         mutex_init(&nand->lock);
 408         nand->base = base;
 409         nand->mtd_count = num_dev;
 410         platform_set_drvdata(pdev, nand);
 411
 412         num_dev_working = 0;
 413         for (i = 0; i < num_dev; i++) {
 414                 err = goldfish_nand_init_device(pdev, nand, i);
 415                 if (err == 0)
 416                         num_dev_working++;
 417         }
 418         if (num_dev_working == 0)
 419                 return -ENODEV;
 420         return 0;
 421 }
 422
 423 static int goldfish_nand_remove(struct platform_device *pdev)
 424 {
 425         struct goldfish_nand *nand = platform_get_drvdata(pdev);
 426         int i;
 427
 428         for (i = 0; i < nand->mtd_count; i++) {
 429                 if (nand->mtd[i].name)
 430                         mtd_device_unregister(&nand->mtd[i]);
 431         }
 432         return 0;
 433 }
 434
 435 static struct platform_driver goldfish_nand_driver = {
 436         .probe          = goldfish_nand_probe,
 437         .remove         = goldfish_nand_remove,
 438         .driver = {
 439                 .name = "goldfish_nand"
 440         }
 441 };
 442
 443 module_platform_driver(goldfish_nand_driver);
 444 MODULE_LICENSE("GPL");