Commit | Line | Data |
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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 | ||
8 | MODULE_LICENSE("GPL"); | |
9 | MODULE_DESCRIPTION("Serial flash driver for BCMA bus"); | |
10 | ||
11 | static const char *probes[] = { "bcm47xxpart", NULL }; | |
12 | ||
13 | static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
14 | size_t *retlen, u_char *buf) | |
15 | { | |
16 | struct bcma_sflash *sflash = mtd->priv; | |
17 | ||
18 | /* Check address range */ | |
19 | if ((from + len) > mtd->size) | |
20 | return -EINVAL; | |
21 | ||
22 | memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(sflash->window + from), | |
23 | len); | |
24 | ||
25 | return len; | |
26 | } | |
27 | ||
28 | static void bcm47xxsflash_fill_mtd(struct bcma_sflash *sflash, | |
29 | struct mtd_info *mtd) | |
30 | { | |
31 | mtd->priv = sflash; | |
32 | mtd->name = "bcm47xxsflash"; | |
33 | mtd->owner = THIS_MODULE; | |
34 | mtd->type = MTD_ROM; | |
35 | mtd->size = sflash->size; | |
36 | mtd->_read = bcm47xxsflash_read; | |
37 | ||
38 | /* TODO: implement writing support and verify/change following code */ | |
39 | mtd->flags = MTD_CAP_ROM; | |
40 | mtd->writebufsize = mtd->writesize = 1; | |
41 | } | |
42 | ||
43 | static int bcm47xxsflash_probe(struct platform_device *pdev) | |
44 | { | |
45 | struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); | |
46 | int err; | |
47 | ||
48 | sflash->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL); | |
49 | if (!sflash->mtd) { | |
50 | err = -ENOMEM; | |
51 | goto out; | |
52 | } | |
53 | bcm47xxsflash_fill_mtd(sflash, sflash->mtd); | |
54 | ||
55 | err = mtd_device_parse_register(sflash->mtd, probes, NULL, NULL, 0); | |
56 | if (err) { | |
57 | pr_err("Failed to register MTD device: %d\n", err); | |
58 | goto err_dev_reg; | |
59 | } | |
60 | ||
61 | return 0; | |
62 | ||
63 | err_dev_reg: | |
64 | kfree(sflash->mtd); | |
65 | out: | |
66 | return err; | |
67 | } | |
68 | ||
69 | static int __devexit bcm47xxsflash_remove(struct platform_device *pdev) | |
70 | { | |
71 | struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev); | |
72 | ||
73 | mtd_device_unregister(sflash->mtd); | |
74 | kfree(sflash->mtd); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static struct platform_driver bcma_sflash_driver = { | |
80 | .remove = __devexit_p(bcm47xxsflash_remove), | |
81 | .driver = { | |
82 | .name = "bcma_sflash", | |
83 | .owner = THIS_MODULE, | |
84 | }, | |
85 | }; | |
86 | ||
87 | static int __init bcm47xxsflash_init(void) | |
88 | { | |
89 | int err; | |
90 | ||
91 | err = platform_driver_probe(&bcma_sflash_driver, bcm47xxsflash_probe); | |
92 | if (err) | |
93 | pr_err("Failed to register BCMA serial flash driver: %d\n", | |
94 | err); | |
95 | ||
96 | return err; | |
97 | } | |
98 | ||
99 | static void __exit bcm47xxsflash_exit(void) | |
100 | { | |
101 | platform_driver_unregister(&bcma_sflash_driver); | |
102 | } | |
103 | ||
104 | module_init(bcm47xxsflash_init); | |
105 | module_exit(bcm47xxsflash_exit); |