1 /*
2 * Broadcom specific AMBA
3 * ChipCommon serial flash interface
4 *
5 * Licensed under the GNU/GPL. See COPYING for details.
6 */
7
8 #include "bcma_private.h"
9
10 #include <linux/platform_device.h>
11 #include <linux/bcma/bcma.h>
12
13 static struct resource bcma_sflash_resource = {
14 .name = "bcma_sflash",
15 .start = BCMA_SOC_FLASH2,
16 .end = 0,
17 .flags = IORESOURCE_MEM | IORESOURCE_READONLY,
18 };
19
20 struct platform_device bcma_sflash_dev = {
21 .name = "bcma_sflash",
22 .resource = &bcma_sflash_resource,
23 .num_resources = 1,
24 };
25
26 struct bcma_sflash_tbl_e {
27 char *name;
28 u32 id;
29 u32 blocksize;
30 u16 numblocks;
31 };
32
33 static const struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
34 { "M25P20", 0x11, 0x10000, 4, },
35 { "M25P40", 0x12, 0x10000, 8, },
36
37 { "M25P16", 0x14, 0x10000, 32, },
38 { "M25P32", 0x15, 0x10000, 64, },
39 { "M25P64", 0x16, 0x10000, 128, },
40 { "M25FL128", 0x17, 0x10000, 256, },
41 { "MX25L25635F", 0x18, 0x10000, 512, },
42 { NULL },
43 };
44
45 static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
46 { "SST25WF512", 1, 0x1000, 16, },
47 { "SST25VF512", 0x48, 0x1000, 16, },
48 { "SST25WF010", 2, 0x1000, 32, },
49 { "SST25VF010", 0x49, 0x1000, 32, },
50 { "SST25WF020", 3, 0x1000, 64, },
51 { "SST25VF020", 0x43, 0x1000, 64, },
52 { "SST25WF040", 4, 0x1000, 128, },
53 { "SST25VF040", 0x44, 0x1000, 128, },
54 { "SST25VF040B", 0x8d, 0x1000, 128, },
55 { "SST25WF080", 5, 0x1000, 256, },
56 { "SST25VF080B", 0x8e, 0x1000, 256, },
57 { "SST25VF016", 0x41, 0x1000, 512, },
58 { "SST25VF032", 0x4a, 0x1000, 1024, },
59 { "SST25VF064", 0x4b, 0x1000, 2048, },
60 { NULL },
61 };
62
63 static const struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
64 { "AT45DB011", 0xc, 256, 512, },
65 { "AT45DB021", 0x14, 256, 1024, },
66 { "AT45DB041", 0x1c, 256, 2048, },
67 { "AT45DB081", 0x24, 256, 4096, },
68 { "AT45DB161", 0x2c, 512, 4096, },
69 { "AT45DB321", 0x34, 512, 8192, },
70 { "AT45DB642", 0x3c, 1024, 8192, },
71 { NULL },
72 };
73
bcma_sflash_cmd(struct bcma_drv_cc * cc,u32 opcode)74 static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
75 {
76 int i;
77 bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
78 BCMA_CC_FLASHCTL_START | opcode);
79 for (i = 0; i < 1000; i++) {
80 if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
81 BCMA_CC_FLASHCTL_BUSY))
82 return;
83 cpu_relax();
84 }
85 bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
86 }
87
88 /* Initialize serial flash access */
bcma_sflash_init(struct bcma_drv_cc * cc)89 int bcma_sflash_init(struct bcma_drv_cc *cc)
90 {
91 struct bcma_bus *bus = cc->core->bus;
92 struct bcma_sflash *sflash = &cc->sflash;
93 const struct bcma_sflash_tbl_e *e;
94 u32 id, id2;
95
96 switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
97 case BCMA_CC_FLASHT_STSER:
98 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
99
100 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
101 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
102 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
103
104 bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
105 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
106 id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
107
108 switch (id) {
109 case 0xbf:
110 for (e = bcma_sflash_sst_tbl; e->name; e++) {
111 if (e->id == id2)
112 break;
113 }
114 break;
115 case 0x13:
116 return -ENOTSUPP;
117 default:
118 for (e = bcma_sflash_st_tbl; e->name; e++) {
119 if (e->id == id)
120 break;
121 }
122 break;
123 }
124 if (!e->name) {
125 bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
126 return -ENOTSUPP;
127 }
128
129 break;
130 case BCMA_CC_FLASHT_ATSER:
131 bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
132 id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
133
134 for (e = bcma_sflash_at_tbl; e->name; e++) {
135 if (e->id == id)
136 break;
137 }
138 if (!e->name) {
139 bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
140 return -ENOTSUPP;
141 }
142
143 break;
144 default:
145 bcma_err(bus, "Unsupported flash type\n");
146 return -ENOTSUPP;
147 }
148
149 sflash->blocksize = e->blocksize;
150 sflash->numblocks = e->numblocks;
151 sflash->size = sflash->blocksize * sflash->numblocks;
152 sflash->present = true;
153
154 bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
155 e->name, sflash->size / 1024, sflash->blocksize,
156 sflash->numblocks);
157
158 /* Prepare platform device, but don't register it yet. It's too early,
159 * malloc (required by device_private_init) is not available yet. */
160 bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
161 sflash->size;
162 bcma_sflash_dev.dev.platform_data = sflash;
163
164 return 0;
165 }
166