GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / bcma / driver_chipcommon_sflash.c
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
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 */
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 }