drivers/mtd/nand/mxs_nand_spl.c

   1 /*
   2  * Copyright (C) 2014 Gateworks Corporation
   3  * Author: Tim Harvey <tharvey@gateworks.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #include <common.h>
   8 #include <nand.h>
   9 #include <malloc.h>
  10
  11 static nand_info_t mtd;
  12 static struct nand_chip nand_chip;
  13
  14 static void mxs_nand_command(struct mtd_info *mtd, unsigned int command,
  15                              int column, int page_addr)
  16 {
  17         register struct nand_chip *chip = mtd->priv;
  18         u32 timeo, time_start;
  19
  20         /* write out the command to the device */
  21         chip->cmd_ctrl(mtd, command, NAND_CLE);
  22
  23         /* Serially input address */
  24         if (column != -1) {
  25                 chip->cmd_ctrl(mtd, column, NAND_ALE);
  26                 chip->cmd_ctrl(mtd, column >> 8, NAND_ALE);
  27         }
  28         if (page_addr != -1) {
  29                 chip->cmd_ctrl(mtd, page_addr, NAND_ALE);
  30                 chip->cmd_ctrl(mtd, page_addr >> 8, NAND_ALE);
  31                 /* One more address cycle for devices > 128MiB */
  32                 if (chip->chipsize > (128 << 20))
  33                         chip->cmd_ctrl(mtd, page_addr >> 16, NAND_ALE);
  34         }
  35         chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0);
  36
  37         if (command == NAND_CMD_READ0) {
  38                 chip->cmd_ctrl(mtd, NAND_CMD_READSTART, NAND_CLE);
  39                 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0);
  40         }
  41
  42         /* wait for nand ready */
  43         ndelay(100);
  44         timeo = (CONFIG_SYS_HZ * 20) / 1000;
  45         time_start = get_timer(0);
  46         while (get_timer(time_start) < timeo) {
  47                 if (chip->dev_ready(mtd))
  48                         break;
  49         }
  50 }
  51
  52 static int mxs_flash_ident(struct mtd_info *mtd)
  53 {
  54         register struct nand_chip *chip = mtd->priv;
  55         int i;
  56         u8 mfg_id, dev_id;
  57         u8 id_data[8];
  58         struct nand_onfi_params *p = &chip->onfi_params;
  59
  60         /* Reset the chip */
  61         chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
  62
  63         /* Send the command for reading device ID */
  64         chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
  65
  66         /* Read manufacturer and device IDs */
  67         mfg_id = chip->read_byte(mtd);
  68         dev_id = chip->read_byte(mtd);
  69
  70         /* Try again to make sure */
  71         chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
  72         for (i = 0; i < 8; i++)
  73                 id_data[i] = chip->read_byte(mtd);
  74         if (id_data[0] != mfg_id || id_data[1] != dev_id) {
  75                 printf("second ID read did not match");
  76                 return -1;
  77         }
  78         debug("0x%02x:0x%02x ", mfg_id, dev_id);
  79
  80         /* read ONFI */
  81         chip->onfi_version = 0;
  82         chip->cmdfunc(mtd, NAND_CMD_READID, 0x20, -1);
  83         if (chip->read_byte(mtd) != 'O' || chip->read_byte(mtd) != 'N' ||
  84             chip->read_byte(mtd) != 'F' || chip->read_byte(mtd) != 'I') {
  85                 return -2;
  86         }
  87
  88         /* we have ONFI, probe it */
  89         chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
  90         chip->read_buf(mtd, (uint8_t *)p, sizeof(*p));
  91         mtd->name = p->model;
  92         mtd->writesize = le32_to_cpu(p->byte_per_page);
  93         mtd->erasesize = le32_to_cpu(p->pages_per_block) * mtd->writesize;
  94         mtd->oobsize = le16_to_cpu(p->spare_bytes_per_page);
  95         chip->chipsize = le32_to_cpu(p->blocks_per_lun);
  96         chip->chipsize *= (uint64_t)mtd->erasesize * p->lun_count;
  97         /* Calculate the address shift from the page size */
  98         chip->page_shift = ffs(mtd->writesize) - 1;
  99         chip->phys_erase_shift = ffs(mtd->erasesize) - 1;
 100         /* Convert chipsize to number of pages per chip -1 */
 101         chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
 102         chip->badblockbits = 8;
 103
 104         debug("erasesize=%d (>>%d)\n", mtd->erasesize, chip->phys_erase_shift);
 105         debug("writesize=%d (>>%d)\n", mtd->writesize, chip->page_shift);
 106         debug("oobsize=%d\n", mtd->oobsize);
 107         debug("chipsize=%lld\n", chip->chipsize);
 108
 109         return 0;
 110 }
 111
 112 static int mxs_read_page_ecc(struct mtd_info *mtd, void *buf, unsigned int page)
 113 {
 114         register struct nand_chip *chip = mtd->priv;
 115         int ret;
 116
 117         chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, page);
 118         ret = nand_chip.ecc.read_page(mtd, chip, buf, 1, page);
 119         if (ret < 0) {
 120                 printf("read_page failed %d\n", ret);
 121                 return -1;
 122         }
 123         return 0;
 124 }
 125
 126 static int is_badblock(struct mtd_info *mtd, loff_t offs, int allowbbt)
 127 {
 128         register struct nand_chip *chip = mtd->priv;
 129         unsigned int block = offs >> chip->phys_erase_shift;
 130         unsigned int page = offs >> chip->page_shift;
 131
 132         debug("%s offs=0x%08x block:%d page:%d\n", __func__, (int)offs, block,
 133               page);
 134         chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
 135         memset(chip->oob_poi, 0, mtd->oobsize);
 136         chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
 137
 138         return chip->oob_poi[0] != 0xff;
 139 }
 140
 141 /* setup mtd and nand structs and init mxs_nand driver */
 142 static int mxs_nand_init(void)
 143 {
 144         /* return if already initalized */
 145         if (nand_chip.numchips)
 146                 return 0;
 147
 148         /* init mxs nand driver */
 149         board_nand_init(&nand_chip);
 150         mtd.priv = &nand_chip;
 151         /* set mtd functions */
 152         nand_chip.cmdfunc = mxs_nand_command;
 153         nand_chip.numchips = 1;
 154
 155         /* identify flash device */
 156         puts("NAND : ");
 157         if (mxs_flash_ident(&mtd)) {
 158                 printf("Failed to identify\n");
 159                 return -1;
 160         }
 161
 162         /* allocate and initialize buffers */
 163         nand_chip.buffers = memalign(ARCH_DMA_MINALIGN,
 164                                      sizeof(*nand_chip.buffers));
 165         nand_chip.oob_poi = nand_chip.buffers->databuf + mtd.writesize;
 166         /* setup flash layout (does not scan as we override that) */
 167         mtd.size = nand_chip.chipsize;
 168         nand_chip.scan_bbt(&mtd);
 169
 170         printf("%llu MiB\n", (mtd.size / (1024 * 1024)));
 171         return 0;
 172 }
 173
 174 int nand_spl_load_image(uint32_t offs, unsigned int size, void *buf)
 175 {
 176         struct nand_chip *chip;
 177         unsigned int page;
 178         unsigned int nand_page_per_block;
 179         unsigned int sz = 0;
 180
 181         if (mxs_nand_init())
 182                 return -ENODEV;
 183         chip = mtd.priv;
 184         page = offs >> chip->page_shift;
 185         nand_page_per_block = mtd.erasesize / mtd.writesize;
 186
 187         debug("%s offset:0x%08x len:%d page:%d\n", __func__, offs, size, page);
 188
 189         size = roundup(size, mtd.writesize);
 190         while (sz < size) {
 191                 if (mxs_read_page_ecc(&mtd, buf, page) < 0)
 192                         return -1;
 193                 sz += mtd.writesize;
 194                 offs += mtd.writesize;
 195                 page++;
 196                 buf += mtd.writesize;
 197
 198                 /*
 199                  * Check if we have crossed a block boundary, and if so
 200                  * check for bad block.
 201                  */
 202                 if (!(page % nand_page_per_block)) {
 203                         /*
 204                          * Yes, new block. See if this block is good. If not,
 205                          * loop until we find a good block.
 206                          */
 207                         while (is_badblock(&mtd, offs, 1)) {
 208                                 page = page + nand_page_per_block;
 209                                 /* Check i we've reached the end of flash. */
 210                                 if (page >= mtd.size >> chip->page_shift)
 211                                         return -ENOMEM;
 212                         }
 213                 }
 214         }
 215
 216         return 0;
 217 }
 218
 219 int nand_default_bbt(struct mtd_info *mtd)
 220 {
 221         return 0;
 222 }
 223
 224 void nand_init(void)
 225 {
 226 }
 227
 228 void nand_deselect(void)
 229 {
 230 }
 231