| Rafał Miłecki | 5fe42d5 | 2012-09-17 11:50:49 +0200 | [diff] [blame] | 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); |