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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 | ||
13 | static const char *probes[] = { "bcm47xxpart", NULL }; | |
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 | ||
64 | b47s->window = sflash->window; | |
65 | b47s->blocksize = sflash->blocksize; | |
66 | b47s->numblocks = sflash->numblocks; | |
67 | b47s->size = sflash->size; | |
68 | bcm47xxsflash_fill_mtd(b47s); | |
5fe42d5b | 69 | |
a2f74a7d | 70 | err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0); |
5fe42d5b RM |
71 | if (err) { |
72 | pr_err("Failed to register MTD device: %d\n", err); | |
73 | goto err_dev_reg; | |
74 | } | |
75 | ||
76 | return 0; | |
77 | ||
78 | err_dev_reg: | |
a2f74a7d | 79 | kfree(&b47s->mtd); |
5fe42d5b RM |
80 | out: |
81 | return err; | |
82 | } | |
83 | ||
f1a7c9d3 | 84 | static int bcm47xxsflash_bcma_remove(struct platform_device *pdev) |
5fe42d5b RM |
85 | { |
86 | struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); | |
a2f74a7d | 87 | struct bcm47xxsflash *b47s = sflash->priv; |
5fe42d5b | 88 | |
a2f74a7d RM |
89 | mtd_device_unregister(&b47s->mtd); |
90 | kfree(b47s); | |
5fe42d5b RM |
91 | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static struct platform_driver bcma_sflash_driver = { | |
f1a7c9d3 RM |
96 | .probe = bcm47xxsflash_bcma_probe, |
97 | .remove = bcm47xxsflash_bcma_remove, | |
5fe42d5b RM |
98 | .driver = { |
99 | .name = "bcma_sflash", | |
100 | .owner = THIS_MODULE, | |
101 | }, | |
102 | }; | |
103 | ||
f1a7c9d3 RM |
104 | /************************************************** |
105 | * Init | |
106 | **************************************************/ | |
107 | ||
5fe42d5b RM |
108 | static int __init bcm47xxsflash_init(void) |
109 | { | |
110 | int err; | |
111 | ||
2d13dc3b | 112 | err = platform_driver_register(&bcma_sflash_driver); |
5fe42d5b RM |
113 | if (err) |
114 | pr_err("Failed to register BCMA serial flash driver: %d\n", | |
115 | err); | |
116 | ||
117 | return err; | |
118 | } | |
119 | ||
120 | static void __exit bcm47xxsflash_exit(void) | |
121 | { | |
122 | platform_driver_unregister(&bcma_sflash_driver); | |
123 | } | |
124 | ||
125 | module_init(bcm47xxsflash_init); | |
126 | module_exit(bcm47xxsflash_exit); |