drivers/mtd/nand/raw/mxs_nand_spl.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2014 Gateworks Corporation
   4  * Copyright 2019 NXP
   5  * Author: Tim Harvey <tharvey@gateworks.com>
   6  */
   7 #include <common.h>
   8 #include <nand.h>
   9 #include <malloc.h>
  10 #include <mxs_nand.h>
  11 #include <linux/err.h>
  12
  13 static struct mtd_info *mtd;
  14 static struct nand_chip nand_chip;
  15
  16 static void mxs_nand_command(struct mtd_info *mtd, unsigned int command,
  17                              int column, int page_addr)
  18 {
  19         register struct nand_chip *chip = mtd_to_nand(mtd);
  20         u32 timeo, time_start;
  21
  22         /* write out the command to the device */
  23         chip->cmd_ctrl(mtd, command, NAND_CLE);
  24
  25         /* Serially input address */
  26         if (column != -1) {
  27                 chip->cmd_ctrl(mtd, column, NAND_ALE);
  28                 chip->cmd_ctrl(mtd, column >> 8, NAND_ALE);
  29         }
  30         if (page_addr != -1) {
  31                 chip->cmd_ctrl(mtd, page_addr, NAND_ALE);
  32                 chip->cmd_ctrl(mtd, page_addr >> 8, NAND_ALE);
  33                 /* One more address cycle for devices > 128MiB */
  34                 if (chip->chipsize > (128 << 20))
  35                         chip->cmd_ctrl(mtd, page_addr >> 16, NAND_ALE);
  36         }
  37         chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0);
  38
  39         if (command == NAND_CMD_READ0) {
  40                 chip->cmd_ctrl(mtd, NAND_CMD_READSTART, NAND_CLE);
  41                 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0);
  42         } else if (command == NAND_CMD_RNDOUT) {
  43                 /* No ready / busy check necessary */
  44                 chip->cmd_ctrl(mtd, NAND_CMD_RNDOUTSTART,
  45                                NAND_NCE | NAND_CLE);
  46                 chip->cmd_ctrl(mtd, NAND_CMD_NONE,
  47                                NAND_NCE);
  48         }
  49
  50         /* wait for nand ready */
  51         ndelay(100);
  52         timeo = (CONFIG_SYS_HZ * 20) / 1000;
  53         time_start = get_timer(0);
  54         while (get_timer(time_start) < timeo) {
  55                 if (chip->dev_ready(mtd))
  56                         break;
  57         }
  58 }
  59
  60 #if defined (CONFIG_SPL_NAND_IDENT)
  61
  62 /* Trying to detect the NAND flash using ONFi, JEDEC, and (extended) IDs */
  63 static int mxs_flash_full_ident(struct mtd_info *mtd)
  64 {
  65         int nand_maf_id, nand_dev_id;
  66         struct nand_chip *chip = mtd_to_nand(mtd);
  67         struct nand_flash_dev *type;
  68
  69         type = nand_get_flash_type(mtd, chip, &nand_maf_id, &nand_dev_id, NULL);
  70
  71         if (IS_ERR(type)) {
  72                 chip->select_chip(mtd, -1);
  73                 return PTR_ERR(type);
  74         }
  75
  76         return 0;
  77 }
  78
  79 #else
  80
  81 /* Trying to detect the NAND flash using ONFi only */
  82 static int mxs_flash_onfi_ident(struct mtd_info *mtd)
  83 {
  84         register struct nand_chip *chip = mtd_to_nand(mtd);
  85         int i;
  86         u8 mfg_id, dev_id;
  87         u8 id_data[8];
  88         struct nand_onfi_params *p = &chip->onfi_params;
  89
  90         /* Reset the chip */
  91         chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
  92
  93         /* Send the command for reading device ID */
  94         chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
  95
  96         /* Read manufacturer and device IDs */
  97         mfg_id = chip->read_byte(mtd);
  98         dev_id = chip->read_byte(mtd);
  99
 100         /* Try again to make sure */
 101         chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
 102         for (i = 0; i < 8; i++)
 103                 id_data[i] = chip->read_byte(mtd);
 104         if (id_data[0] != mfg_id || id_data[1] != dev_id) {
 105                 printf("second ID read did not match");
 106                 return -1;
 107         }
 108         debug("0x%02x:0x%02x ", mfg_id, dev_id);
 109
 110         /* read ONFI */
 111         chip->onfi_version = 0;
 112         chip->cmdfunc(mtd, NAND_CMD_READID, 0x20, -1);
 113         if (chip->read_byte(mtd) != 'O' || chip->read_byte(mtd) != 'N' ||
 114             chip->read_byte(mtd) != 'F' || chip->read_byte(mtd) != 'I') {
 115                 return -2;
 116         }
 117
 118         /* we have ONFI, probe it */
 119         chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
 120         chip->read_buf(mtd, (uint8_t *)p, sizeof(*p));
 121         mtd->name = p->model;
 122         mtd->writesize = le32_to_cpu(p->byte_per_page);
 123         mtd->erasesize = le32_to_cpu(p->pages_per_block) * mtd->writesize;
 124         mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page);
 125         chip->chipsize = le32_to_cpu(p->blocks_per_lun);
 126         chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
 127         /* Calculate the address shift from the page size */
 128         chip->page_shift = ffs(mtd->writesize) - 1;
 129         chip->phys_erase_shift = ffs(mtd->erasesize) - 1;
 130         /* Convert chipsize to number of pages per chip -1 */
 131         chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
 132         chip->badblockbits = 8;
 133
 134         debug("erasesize=%d (>>%d)\n", mtd->erasesize, chip->phys_erase_shift);
 135         debug("writesize=%d (>>%d)\n", mtd->writesize, chip->page_shift);
 136         debug("oobsize=%d\n", mtd->oobsize);
 137         debug("chipsize=%lld\n", chip->chipsize);
 138
 139         return 0;
 140 }
 141
 142 #endif /* CONFIG_SPL_NAND_IDENT */
 143
 144 static int mxs_flash_ident(struct mtd_info *mtd)
 145 {
 146         int ret;
 147 #if defined (CONFIG_SPL_NAND_IDENT)
 148         ret = mxs_flash_full_ident(mtd);
 149 #else
 150         ret = mxs_flash_onfi_ident(mtd);
 151 #endif
 152         return ret;
 153 }
 154
 155 static int mxs_read_page_ecc(struct mtd_info *mtd, void *buf, unsigned int page)
 156 {
 157         register struct nand_chip *chip = mtd_to_nand(mtd);
 158         int ret;
 159
 160         chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, page);
 161         ret = nand_chip.ecc.read_page(mtd, chip, buf, 1, page);
 162         if (ret < 0) {
 163                 printf("read_page failed %d\n", ret);
 164                 return -1;
 165         }
 166         return 0;
 167 }
 168
 169 static int is_badblock(struct mtd_info *mtd, loff_t offs, int allowbbt)
 170 {
 171         register struct nand_chip *chip = mtd_to_nand(mtd);
 172         unsigned int block = offs >> chip->phys_erase_shift;
 173         unsigned int page = offs >> chip->page_shift;
 174
 175         debug("%s offs=0x%08x block:%d page:%d\n", __func__, (int)offs, block,
 176               page);
 177         chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
 178         memset(chip->oob_poi, 0, mtd->oobsize);
 179         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 180
 181         return chip->oob_poi[0] != 0xff;
 182 }
 183
 184 /* setup mtd and nand structs and init mxs_nand driver */
 185 void nand_init(void)
 186 {
 187         /* return if already initalized */
 188         if (nand_chip.numchips)
 189                 return;
 190
 191         /* init mxs nand driver */
 192         mxs_nand_init_spl(&nand_chip);
 193         mtd = nand_to_mtd(&nand_chip);
 194         /* set mtd functions */
 195         nand_chip.cmdfunc = mxs_nand_command;
 196         nand_chip.scan_bbt = nand_default_bbt;
 197         nand_chip.numchips = 1;
 198
 199         /* identify flash device */
 200         if (mxs_flash_ident(mtd)) {
 201                 printf("Failed to identify\n");
 202                 nand_chip.numchips = 0; /* If fail, don't use nand */
 203                 return;
 204         }
 205
 206         /* allocate and initialize buffers */
 207         nand_chip.buffers = memalign(ARCH_DMA_MINALIGN,
 208                                      sizeof(*nand_chip.buffers));
 209         nand_chip.oob_poi = nand_chip.buffers->databuf + mtd->writesize;
 210         /* setup flash layout (does not scan as we override that) */
 211         mtd->size = nand_chip.chipsize;
 212         nand_chip.scan_bbt(mtd);
 213         mxs_nand_setup_ecc(mtd);
 214 }
 215
 216 int nand_spl_load_image(uint32_t offs, unsigned int size, void *buf)
 217 {
 218         struct nand_chip *chip;
 219         unsigned int page;
 220         unsigned int nand_page_per_block;
 221         unsigned int sz = 0;
 222         u8 *page_buf = NULL;
 223         u32 page_off;
 224
 225         chip = mtd_to_nand(mtd);
 226         if (!chip->numchips)
 227                 return -ENODEV;
 228
 229         page_buf = malloc(mtd->writesize);
 230         if (!page_buf)
 231                 return -ENOMEM;
 232
 233         page = offs >> chip->page_shift;
 234         page_off = offs & (mtd->writesize - 1);
 235         nand_page_per_block = mtd->erasesize / mtd->writesize;
 236
 237         debug("%s offset:0x%08x len:%d page:%x\n", __func__, offs, size, page);
 238
 239         while (size) {
 240                 if (mxs_read_page_ecc(mtd, page_buf, page) < 0)
 241                         return -1;
 242
 243                 if (size > (mtd->writesize - page_off))
 244                         sz = (mtd->writesize - page_off);
 245                 else
 246                         sz = size;
 247
 248                 memcpy(buf, page_buf + page_off, sz);
 249
 250                 offs += mtd->writesize;
 251                 page++;
 252                 buf += (mtd->writesize - page_off);
 253                 page_off = 0;
 254                 size -= sz;
 255
 256                 /*
 257                  * Check if we have crossed a block boundary, and if so
 258                  * check for bad block.
 259                  */
 260                 if (!(page % nand_page_per_block)) {
 261                         /*
 262                          * Yes, new block. See if this block is good. If not,
 263                          * loop until we find a good block.
 264                          */
 265                         while (is_badblock(mtd, offs, 1)) {
 266                                 page = page + nand_page_per_block;
 267                                 /* Check i we've reached the end of flash. */
 268                                 if (page >= mtd->size >> chip->page_shift) {
 269                                         free(page_buf);
 270                                         return -ENOMEM;
 271                                 }
 272                         }
 273                 }
 274         }
 275
 276         free(page_buf);
 277
 278         return 0;
 279 }
 280
 281 int nand_default_bbt(struct mtd_info *mtd)
 282 {
 283         return 0;
 284 }
 285
 286 void nand_deselect(void)
 287 {
 288 }
 289