1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2014 Gateworks Corporation
5 * Author: Tim Harvey <tharvey@gateworks.com>
11 #include <linux/err.h>
13 static struct mtd_info *mtd;
14 static struct nand_chip nand_chip;
16 static void mxs_nand_command(struct mtd_info *mtd, unsigned int command,
17 int column, int page_addr)
19 register struct nand_chip *chip = mtd_to_nand(mtd);
20 u32 timeo, time_start;
22 /* write out the command to the device */
23 chip->cmd_ctrl(mtd, command, NAND_CLE);
25 /* Serially input address */
27 chip->cmd_ctrl(mtd, column, NAND_ALE);
28 chip->cmd_ctrl(mtd, column >> 8, NAND_ALE);
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);
37 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0);
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,
46 chip->cmd_ctrl(mtd, NAND_CMD_NONE,
50 /* wait for nand ready */
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))
60 #if defined (CONFIG_SPL_NAND_IDENT)
62 /* Trying to detect the NAND flash using ONFi, JEDEC, and (extended) IDs */
63 static int mxs_flash_full_ident(struct mtd_info *mtd)
65 int nand_maf_id, nand_dev_id;
66 struct nand_chip *chip = mtd_to_nand(mtd);
67 struct nand_flash_dev *type;
69 type = nand_get_flash_type(mtd, chip, &nand_maf_id, &nand_dev_id, NULL);
72 chip->select_chip(mtd, -1);
81 /* Trying to detect the NAND flash using ONFi only */
82 static int mxs_flash_onfi_ident(struct mtd_info *mtd)
84 register struct nand_chip *chip = mtd_to_nand(mtd);
88 struct nand_onfi_params *p = &chip->onfi_params;
91 chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
93 /* Send the command for reading device ID */
94 chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
96 /* Read manufacturer and device IDs */
97 mfg_id = chip->read_byte(mtd);
98 dev_id = chip->read_byte(mtd);
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");
108 debug("0x%02x:0x%02x ", mfg_id, dev_id);
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') {
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;
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);
142 #endif /* CONFIG_SPL_NAND_IDENT */
144 static int mxs_flash_ident(struct mtd_info *mtd)
147 #if defined (CONFIG_SPL_NAND_IDENT)
148 ret = mxs_flash_full_ident(mtd);
150 ret = mxs_flash_onfi_ident(mtd);
155 static int mxs_read_page_ecc(struct mtd_info *mtd, void *buf, unsigned int page)
157 register struct nand_chip *chip = mtd_to_nand(mtd);
160 chip->cmdfunc(mtd, NAND_CMD_READ0, 0x0, page);
161 ret = nand_chip.ecc.read_page(mtd, chip, buf, 1, page);
163 printf("read_page failed %d\n", ret);
169 static int is_badblock(struct mtd_info *mtd, loff_t offs, int allowbbt)
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;
175 debug("%s offs=0x%08x block:%d page:%d\n", __func__, (int)offs, block,
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);
181 return chip->oob_poi[0] != 0xff;
184 /* setup mtd and nand structs and init mxs_nand driver */
187 /* return if already initalized */
188 if (nand_chip.numchips)
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;
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 */
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);
216 int nand_spl_load_image(uint32_t offs, unsigned int size, void *buf)
218 struct nand_chip *chip;
220 unsigned int nand_page_per_block;
225 chip = mtd_to_nand(mtd);
229 page_buf = malloc(mtd->writesize);
233 page = offs >> chip->page_shift;
234 page_off = offs & (mtd->writesize - 1);
235 nand_page_per_block = mtd->erasesize / mtd->writesize;
237 debug("%s offset:0x%08x len:%d page:%x\n", __func__, offs, size, page);
240 if (mxs_read_page_ecc(mtd, page_buf, page) < 0)
243 if (size > (mtd->writesize - page_off))
244 sz = (mtd->writesize - page_off);
248 memcpy(buf, page_buf + page_off, sz);
250 offs += mtd->writesize;
252 buf += (mtd->writesize - page_off);
257 * Check if we have crossed a block boundary, and if so
258 * check for bad block.
260 if (!(page % nand_page_per_block)) {
262 * Yes, new block. See if this block is good. If not,
263 * loop until we find a good block.
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) {
281 int nand_default_bbt(struct mtd_info *mtd)
286 void nand_deselect(void)