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sf: sst: support newer standardized flashes
[u-boot] / drivers / mtd / spi / sst.c
1 /*
2  * Driver for SST serial flashes
3  *
4  * (C) Copyright 2000-2002
5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6  * Copyright 2008, Network Appliance Inc.
7  * Jason McMullan <mcmullan@netapp.com>
8  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
9  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
10  * Copyright (c) 2008-2009 Analog Devices Inc.
11  *
12  * Licensed under the GPL-2 or later.
13  */
14
15 #include <common.h>
16 #include <malloc.h>
17 #include <spi_flash.h>
18
19 #include "spi_flash_internal.h"
20
21 #define CMD_SST_WREN            0x06    /* Write Enable */
22 #define CMD_SST_WRDI            0x04    /* Write Disable */
23 #define CMD_SST_RDSR            0x05    /* Read Status Register */
24 #define CMD_SST_WRSR            0x01    /* Write Status Register */
25 #define CMD_SST_READ            0x03    /* Read Data Bytes */
26 #define CMD_SST_FAST_READ       0x0b    /* Read Data Bytes at Higher Speed */
27 #define CMD_SST_BP              0x02    /* Byte Program */
28 #define CMD_SST_AAI_WP          0xAD    /* Auto Address Increment Word Program */
29 #define CMD_SST_SE              0x20    /* Sector Erase */
30
31 #define SST_SR_WIP              (1 << 0)        /* Write-in-Progress */
32 #define SST_SR_WEL              (1 << 1)        /* Write enable */
33 #define SST_SR_BP0              (1 << 2)        /* Block Protection 0 */
34 #define SST_SR_BP1              (1 << 3)        /* Block Protection 1 */
35 #define SST_SR_BP2              (1 << 4)        /* Block Protection 2 */
36 #define SST_SR_AAI              (1 << 6)        /* Addressing mode */
37 #define SST_SR_BPL              (1 << 7)        /* BP bits lock */
38
39 #define SST_FEAT_WP             (1 << 0)        /* Supports AAI word program */
40 #define SST_FEAT_MBP            (1 << 1)        /* Supports multibyte program */
41
42 struct sst_spi_flash_params {
43         u8 idcode1;
44         u8 flags;
45         u16 nr_sectors;
46         const char *name;
47 };
48
49 struct sst_spi_flash {
50         struct spi_flash flash;
51         const struct sst_spi_flash_params *params;
52 };
53
54 static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
55 {
56         return container_of(flash, struct sst_spi_flash, flash);
57 }
58
59 #define SST_SECTOR_SIZE (4 * 1024)
60 #define SST_PAGE_SIZE   256
61 static const struct sst_spi_flash_params sst_spi_flash_table[] = {
62         {
63                 .idcode1 = 0x8d,
64                 .flags = SST_FEAT_WP,
65                 .nr_sectors = 128,
66                 .name = "SST25VF040B",
67         },{
68                 .idcode1 = 0x8e,
69                 .flags = SST_FEAT_WP,
70                 .nr_sectors = 256,
71                 .name = "SST25VF080B",
72         },{
73                 .idcode1 = 0x41,
74                 .flags = SST_FEAT_WP,
75                 .nr_sectors = 512,
76                 .name = "SST25VF016B",
77         },{
78                 .idcode1 = 0x4a,
79                 .flags = SST_FEAT_WP,
80                 .nr_sectors = 1024,
81                 .name = "SST25VF032B",
82         },{
83                 .idcode1 = 0x4b,
84                 .flags = SST_FEAT_MBP,
85                 .nr_sectors = 2048,
86                 .name = "SST25VF064C",
87         },{
88                 .idcode1 = 0x01,
89                 .flags = SST_FEAT_WP,
90                 .nr_sectors = 16,
91                 .name = "SST25WF512",
92         },{
93                 .idcode1 = 0x02,
94                 .flags = SST_FEAT_WP,
95                 .nr_sectors = 32,
96                 .name = "SST25WF010",
97         },{
98                 .idcode1 = 0x03,
99                 .flags = SST_FEAT_WP,
100                 .nr_sectors = 64,
101                 .name = "SST25WF020",
102         },{
103                 .idcode1 = 0x04,
104                 .flags = SST_FEAT_WP,
105                 .nr_sectors = 128,
106                 .name = "SST25WF040",
107         },
108 };
109
110 static int
111 sst_enable_writing(struct spi_flash *flash)
112 {
113         int ret = spi_flash_cmd_write_enable(flash);
114         if (ret)
115                 debug("SF: Enabling Write failed\n");
116         return ret;
117 }
118
119 static int
120 sst_disable_writing(struct spi_flash *flash)
121 {
122         int ret = spi_flash_cmd_write_disable(flash);
123         if (ret)
124                 debug("SF: Disabling Write failed\n");
125         return ret;
126 }
127
128 static int
129 sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
130 {
131         int ret;
132         u8 cmd[4] = {
133                 CMD_SST_BP,
134                 offset >> 16,
135                 offset >> 8,
136                 offset,
137         };
138
139         debug("BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
140                 spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
141
142         ret = sst_enable_writing(flash);
143         if (ret)
144                 return ret;
145
146         ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
147         if (ret)
148                 return ret;
149
150         return spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
151 }
152
153 static int
154 sst_write_wp(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
155 {
156         size_t actual, cmd_len;
157         int ret;
158         u8 cmd[4];
159
160         ret = spi_claim_bus(flash->spi);
161         if (ret) {
162                 debug("SF: Unable to claim SPI bus\n");
163                 return ret;
164         }
165
166         /* If the data is not word aligned, write out leading single byte */
167         actual = offset % 2;
168         if (actual) {
169                 ret = sst_byte_write(flash, offset, buf);
170                 if (ret)
171                         goto done;
172         }
173         offset += actual;
174
175         ret = sst_enable_writing(flash);
176         if (ret)
177                 goto done;
178
179         cmd_len = 4;
180         cmd[0] = CMD_SST_AAI_WP;
181         cmd[1] = offset >> 16;
182         cmd[2] = offset >> 8;
183         cmd[3] = offset;
184
185         for (; actual < len - 1; actual += 2) {
186                 debug("WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
187                      spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
188                      offset);
189
190                 ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
191                                           buf + actual, 2);
192                 if (ret) {
193                         debug("SF: sst word program failed\n");
194                         break;
195                 }
196
197                 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
198                 if (ret)
199                         break;
200
201                 cmd_len = 1;
202                 offset += 2;
203         }
204
205         if (!ret)
206                 ret = sst_disable_writing(flash);
207
208         /* If there is a single trailing byte, write it out */
209         if (!ret && actual != len)
210                 ret = sst_byte_write(flash, offset, buf + actual);
211
212  done:
213         debug("SF: sst: program %s %zu bytes @ 0x%zx\n",
214               ret ? "failure" : "success", len, offset - actual);
215
216         spi_release_bus(flash->spi);
217         return ret;
218 }
219
220 static int sst_erase(struct spi_flash *flash, u32 offset, size_t len)
221 {
222         return spi_flash_cmd_erase(flash, CMD_SST_SE, offset, len);
223 }
224
225 static int
226 sst_unlock(struct spi_flash *flash)
227 {
228         int ret;
229         u8 cmd, status;
230
231         ret = sst_enable_writing(flash);
232         if (ret)
233                 return ret;
234
235         cmd = CMD_SST_WRSR;
236         status = 0;
237         ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
238         if (ret)
239                 debug("SF: Unable to set status byte\n");
240
241         debug("SF: sst: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
242
243         return ret;
244 }
245
246 struct spi_flash *
247 spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
248 {
249         const struct sst_spi_flash_params *params;
250         struct sst_spi_flash *stm;
251         size_t i;
252
253         for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
254                 params = &sst_spi_flash_table[i];
255                 if (params->idcode1 == idcode[2])
256                         break;
257         }
258
259         if (i == ARRAY_SIZE(sst_spi_flash_table)) {
260                 debug("SF: Unsupported SST ID %02x\n", idcode[1]);
261                 return NULL;
262         }
263
264         stm = malloc(sizeof(*stm));
265         if (!stm) {
266                 debug("SF: Failed to allocate memory\n");
267                 return NULL;
268         }
269
270         stm->params = params;
271         stm->flash.spi = spi;
272         stm->flash.name = params->name;
273
274         if (stm->params->flags & SST_FEAT_WP)
275                 stm->flash.write = sst_write_wp;
276         else
277                 stm->flash.write = spi_flash_cmd_write_multi;
278         stm->flash.erase = sst_erase;
279         stm->flash.read = spi_flash_cmd_read_fast;
280         stm->flash.page_size = SST_PAGE_SIZE;
281         stm->flash.sector_size = SST_SECTOR_SIZE;
282         stm->flash.size = stm->flash.sector_size * params->nr_sectors;
283
284         /* Flash powers up read-only, so clear BP# bits */
285         sst_unlock(&stm->flash);
286
287         return &stm->flash;
288 }