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nand: Embed mtd_info in struct nand_chip
[u-boot] / 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 struct mtd_info *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 = &nand_chip.mtd;
151         mtd->priv = &nand_chip;
152         /* set mtd functions */
153         nand_chip.cmdfunc = mxs_nand_command;
154         nand_chip.numchips = 1;
155
156         /* identify flash device */
157         puts("NAND : ");
158         if (mxs_flash_ident(mtd)) {
159                 printf("Failed to identify\n");
160                 return -1;
161         }
162
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);
170
171         printf("%llu MiB\n", (mtd->size / (1024 * 1024)));
172         return 0;
173 }
174
175 int nand_spl_load_image(uint32_t offs, unsigned int size, void *buf)
176 {
177         struct nand_chip *chip;
178         unsigned int page;
179         unsigned int nand_page_per_block;
180         unsigned int sz = 0;
181
182         if (mxs_nand_init())
183                 return -ENODEV;
184         chip = mtd->priv;
185         page = offs >> chip->page_shift;
186         nand_page_per_block = mtd->erasesize / mtd->writesize;
187
188         debug("%s offset:0x%08x len:%d page:%d\n", __func__, offs, size, page);
189
190         size = roundup(size, mtd->writesize);
191         while (sz < size) {
192                 if (mxs_read_page_ecc(mtd, buf, page) < 0)
193                         return -1;
194                 sz += mtd->writesize;
195                 offs += mtd->writesize;
196                 page++;
197                 buf += mtd->writesize;
198
199                 /*
200                  * Check if we have crossed a block boundary, and if so
201                  * check for bad block.
202                  */
203                 if (!(page % nand_page_per_block)) {
204                         /*
205                          * Yes, new block. See if this block is good. If not,
206                          * loop until we find a good block.
207                          */
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)
212                                         return -ENOMEM;
213                         }
214                 }
215         }
216
217         return 0;
218 }
219
220 int nand_default_bbt(struct mtd_info *mtd)
221 {
222         return 0;
223 }
224
225 void nand_init(void)
226 {
227 }
228
229 void nand_deselect(void)
230 {
231 }
232