2 * Copyright (C) 2014 Gateworks Corporation
3 * Author: Tim Harvey <tharvey@gateworks.com>
5 * SPDX-License-Identifier: GPL-2.0+
11 static struct mtd_info *mtd;
12 static struct nand_chip nand_chip;
14 static void mxs_nand_command(struct mtd_info *mtd, unsigned int command,
15 int column, int page_addr)
17 register struct nand_chip *chip = mtd->priv;
18 u32 timeo, time_start;
20 /* write out the command to the device */
21 chip->cmd_ctrl(mtd, command, NAND_CLE);
23 /* Serially input address */
25 chip->cmd_ctrl(mtd, column, NAND_ALE);
26 chip->cmd_ctrl(mtd, column >> 8, NAND_ALE);
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);
35 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0);
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);
42 /* wait for nand ready */
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))
52 static int mxs_flash_ident(struct mtd_info *mtd)
54 register struct nand_chip *chip = mtd->priv;
58 struct nand_onfi_params *p = &chip->onfi_params;
61 chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
63 /* Send the command for reading device ID */
64 chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
66 /* Read manufacturer and device IDs */
67 mfg_id = chip->read_byte(mtd);
68 dev_id = chip->read_byte(mtd);
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");
78 debug("0x%02x:0x%02x ", mfg_id, dev_id);
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') {
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));
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;
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);
112 static int mxs_read_page_ecc(struct mtd_info *mtd, void *buf, unsigned int page)
114 register struct nand_chip *chip = mtd->priv;
117 chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, page);
118 ret = nand_chip.ecc.read_page(mtd, chip, buf, 1, page);
120 printf("read_page failed %d\n", ret);
126 static int is_badblock(struct mtd_info *mtd, loff_t offs, int allowbbt)
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;
132 debug("%s offs=0x%08x block:%d page:%d\n", __func__, (int)offs, block,
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);
138 return chip->oob_poi[0] != 0xff;
141 /* setup mtd and nand structs and init mxs_nand driver */
142 static int mxs_nand_init(void)
144 /* return if already initalized */
145 if (nand_chip.numchips)
148 /* init mxs nand driver */
149 board_nand_init(&nand_chip);
150 mtd = &nand_chip.mtd;
151 mtd->priv = &nand_chip;
152 /* set mtd functions */
153 nand_chip.cmdfunc = mxs_nand_command;
154 nand_chip.numchips = 1;
156 /* identify flash device */
158 if (mxs_flash_ident(mtd)) {
159 printf("Failed to identify\n");
163 /* allocate and initialize buffers */
164 nand_chip.buffers = memalign(ARCH_DMA_MINALIGN,
165 sizeof(*nand_chip.buffers));
166 nand_chip.oob_poi = nand_chip.buffers->databuf + mtd->writesize;
167 /* setup flash layout (does not scan as we override that) */
168 mtd->size = nand_chip.chipsize;
169 nand_chip.scan_bbt(mtd);
171 printf("%llu MiB\n", (mtd->size / (1024 * 1024)));
175 int nand_spl_load_image(uint32_t offs, unsigned int size, void *buf)
177 struct nand_chip *chip;
179 unsigned int nand_page_per_block;
185 page = offs >> chip->page_shift;
186 nand_page_per_block = mtd->erasesize / mtd->writesize;
188 debug("%s offset:0x%08x len:%d page:%d\n", __func__, offs, size, page);
190 size = roundup(size, mtd->writesize);
192 if (mxs_read_page_ecc(mtd, buf, page) < 0)
194 sz += mtd->writesize;
195 offs += mtd->writesize;
197 buf += mtd->writesize;
200 * Check if we have crossed a block boundary, and if so
201 * check for bad block.
203 if (!(page % nand_page_per_block)) {
205 * Yes, new block. See if this block is good. If not,
206 * loop until we find a good block.
208 while (is_badblock(mtd, offs, 1)) {
209 page = page + nand_page_per_block;
210 /* Check i we've reached the end of flash. */
211 if (page >= mtd->size >> chip->page_shift)
220 int nand_default_bbt(struct mtd_info *mtd)
229 void nand_deselect(void)