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5fe42d5b RM |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
3 | #include <linux/slab.h> | |
4 | #include <linux/mtd/mtd.h> | |
5 | #include <linux/platform_device.h> | |
6 | #include <linux/bcma/bcma.h> | |
7 | ||
a2f74a7d RM |
8 | #include "bcm47xxsflash.h" |
9 | ||
5fe42d5b RM |
10 | MODULE_LICENSE("GPL"); |
11 | MODULE_DESCRIPTION("Serial flash driver for BCMA bus"); | |
12 | ||
afffeec9 | 13 | static const char * const probes[] = { "bcm47xxpart", NULL }; |
5fe42d5b RM |
14 | |
15 | static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
16 | size_t *retlen, u_char *buf) | |
17 | { | |
a2f74a7d | 18 | struct bcm47xxsflash *b47s = mtd->priv; |
5fe42d5b RM |
19 | |
20 | /* Check address range */ | |
21 | if ((from + len) > mtd->size) | |
22 | return -EINVAL; | |
23 | ||
a2f74a7d | 24 | memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from), |
5fe42d5b | 25 | len); |
60aca067 | 26 | *retlen = len; |
5fe42d5b RM |
27 | |
28 | return len; | |
29 | } | |
30 | ||
a2f74a7d | 31 | static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s) |
5fe42d5b | 32 | { |
a2f74a7d RM |
33 | struct mtd_info *mtd = &b47s->mtd; |
34 | ||
35 | mtd->priv = b47s; | |
5fe42d5b RM |
36 | mtd->name = "bcm47xxsflash"; |
37 | mtd->owner = THIS_MODULE; | |
38 | mtd->type = MTD_ROM; | |
a2f74a7d | 39 | mtd->size = b47s->size; |
5fe42d5b RM |
40 | mtd->_read = bcm47xxsflash_read; |
41 | ||
42 | /* TODO: implement writing support and verify/change following code */ | |
43 | mtd->flags = MTD_CAP_ROM; | |
44 | mtd->writebufsize = mtd->writesize = 1; | |
45 | } | |
46 | ||
f1a7c9d3 RM |
47 | /************************************************** |
48 | * BCMA | |
49 | **************************************************/ | |
50 | ||
51 | static int bcm47xxsflash_bcma_probe(struct platform_device *pdev) | |
5fe42d5b RM |
52 | { |
53 | struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); | |
a2f74a7d | 54 | struct bcm47xxsflash *b47s; |
5fe42d5b RM |
55 | int err; |
56 | ||
a2f74a7d RM |
57 | b47s = kzalloc(sizeof(*b47s), GFP_KERNEL); |
58 | if (!b47s) { | |
5fe42d5b RM |
59 | err = -ENOMEM; |
60 | goto out; | |
61 | } | |
a2f74a7d RM |
62 | sflash->priv = b47s; |
63 | ||
41c81536 RM |
64 | b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash); |
65 | ||
1f816bc7 RM |
66 | switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) { |
67 | case BCMA_CC_FLASHT_STSER: | |
68 | b47s->type = BCM47XXSFLASH_TYPE_ST; | |
69 | break; | |
70 | case BCMA_CC_FLASHT_ATSER: | |
71 | b47s->type = BCM47XXSFLASH_TYPE_ATMEL; | |
72 | break; | |
73 | } | |
74 | ||
a2f74a7d RM |
75 | b47s->window = sflash->window; |
76 | b47s->blocksize = sflash->blocksize; | |
77 | b47s->numblocks = sflash->numblocks; | |
78 | b47s->size = sflash->size; | |
79 | bcm47xxsflash_fill_mtd(b47s); | |
5fe42d5b | 80 | |
a2f74a7d | 81 | err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0); |
5fe42d5b RM |
82 | if (err) { |
83 | pr_err("Failed to register MTD device: %d\n", err); | |
84 | goto err_dev_reg; | |
85 | } | |
86 | ||
87 | return 0; | |
88 | ||
89 | err_dev_reg: | |
a2f74a7d | 90 | kfree(&b47s->mtd); |
5fe42d5b RM |
91 | out: |
92 | return err; | |
93 | } | |
94 | ||
f1a7c9d3 | 95 | static int bcm47xxsflash_bcma_remove(struct platform_device *pdev) |
5fe42d5b RM |
96 | { |
97 | struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); | |
a2f74a7d | 98 | struct bcm47xxsflash *b47s = sflash->priv; |
5fe42d5b | 99 | |
a2f74a7d RM |
100 | mtd_device_unregister(&b47s->mtd); |
101 | kfree(b47s); | |
5fe42d5b RM |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static struct platform_driver bcma_sflash_driver = { | |
f1a7c9d3 RM |
107 | .probe = bcm47xxsflash_bcma_probe, |
108 | .remove = bcm47xxsflash_bcma_remove, | |
5fe42d5b RM |
109 | .driver = { |
110 | .name = "bcma_sflash", | |
111 | .owner = THIS_MODULE, | |
112 | }, | |
113 | }; | |
114 | ||
f1a7c9d3 RM |
115 | /************************************************** |
116 | * Init | |
117 | **************************************************/ | |
118 | ||
5fe42d5b RM |
119 | static int __init bcm47xxsflash_init(void) |
120 | { | |
121 | int err; | |
122 | ||
2d13dc3b | 123 | err = platform_driver_register(&bcma_sflash_driver); |
5fe42d5b RM |
124 | if (err) |
125 | pr_err("Failed to register BCMA serial flash driver: %d\n", | |
126 | err); | |
127 | ||
128 | return err; | |
129 | } | |
130 | ||
131 | static void __exit bcm47xxsflash_exit(void) | |
132 | { | |
133 | platform_driver_unregister(&bcma_sflash_driver); | |
134 | } | |
135 | ||
136 | module_init(bcm47xxsflash_init); | |
137 | module_exit(bcm47xxsflash_exit); |