Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[firefly-linux-kernel-4.4.55.git] / drivers / mtd / devices / bcm47xxsflash.c
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 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 = 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);