1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* Broadcom specific AMBA
* ChipCommon serial flash interface
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include <linux/platform_device.h>
#include <linux/bcma/bcma.h>
#include "bcma_private.h"
static struct resource bcma_sflash_resource = {
.name = "bcma_sflash",
.start = BCMA_SFLASH,
.end = 0,
.flags = IORESOURCE_MEM | IORESOURCE_READONLY,
};
struct platform_device bcma_sflash_dev = {
.name = "bcma_sflash",
.resource = &bcma_sflash_resource,
.num_resources = 1,
};
struct bcma_sflash_tbl_e {
char *name;
u32 id;
u32 blocksize;
u16 numblocks;
};
static struct bcma_sflash_tbl_e bcma_sflash_st_tbl[] = {
{ "", 0x14, 0x10000, 32, },
{ 0 },
};
static struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
{ 0 },
};
static struct bcma_sflash_tbl_e bcma_sflash_at_tbl[] = {
{ 0 },
};
static void bcma_sflash_cmd(struct bcma_drv_cc *cc, u32 opcode)
{
int i;
bcma_cc_write32(cc, BCMA_CC_FLASHCTL,
BCMA_CC_FLASHCTL_START | opcode);
for (i = 0; i < 1000; i++) {
if (!(bcma_cc_read32(cc, BCMA_CC_FLASHCTL) &
BCMA_CC_FLASHCTL_BUSY))
return;
cpu_relax();
}
bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
}
/* Initialize serial flash access */
int bcma_sflash_init(struct bcma_drv_cc *cc)
{
struct bcma_bus *bus = cc->core->bus;
struct bcma_sflash *sflash = &cc->sflash;
struct bcma_sflash_tbl_e *e;
u32 id, id2;
switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
case BCMA_CC_FLASHT_STSER:
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_DP);
bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 0);
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
bcma_cc_write32(cc, BCMA_CC_FLASHADDR, 1);
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_ST_RES);
id2 = bcma_cc_read32(cc, BCMA_CC_FLASHDATA);
switch (id) {
case 0xbf:
for (e = bcma_sflash_sst_tbl; e->name; e++) {
if (e->id == id2)
break;
}
break;
default:
for (e = bcma_sflash_st_tbl; e->name; e++) {
if (e->id == id)
break;
}
break;
}
if (!e->name) {
bcma_err(bus, "Unsupported ST serial flash (id: 0x%X, id2: 0x%X)\n", id, id2);
return -ENOTSUPP;
}
break;
case BCMA_CC_FLASHT_ATSER:
bcma_sflash_cmd(cc, BCMA_CC_FLASHCTL_AT_STATUS);
id = bcma_cc_read32(cc, BCMA_CC_FLASHDATA) & 0x3c;
for (e = bcma_sflash_at_tbl; e->name; e++) {
if (e->id == id)
break;
}
if (!e->name) {
bcma_err(bus, "Unsupported Atmel serial flash (id: 0x%X)\n", id);
return -ENOTSUPP;
}
break;
default:
bcma_err(bus, "Unsupported flash type\n");
return -ENOTSUPP;
}
sflash->window = BCMA_SFLASH;
sflash->blocksize = e->blocksize;
sflash->numblocks = e->numblocks;
sflash->size = sflash->blocksize * sflash->numblocks;
sflash->present = true;
bcma_info(bus, "Found %s serial flash (size: %dKiB, blocksize: 0x%X, blocks: %d)\n",
e->name, sflash->size / 1024, sflash->blocksize,
sflash->numblocks);
/* Prepare platform device, but don't register it yet. It's too early,
* malloc (required by device_private_init) is not available yet. */
bcma_sflash_dev.resource[0].end = bcma_sflash_dev.resource[0].start +
sflash->size;
bcma_sflash_dev.dev.platform_data = sflash;
return 0;
}
|
