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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/platform_device.h>
#include <linux/bcma/bcma.h>
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Serial flash driver for BCMA bus");
static const char *probes[] = { "bcm47xxpart", NULL };
static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct bcma_sflash *sflash = mtd->priv;
/* Check address range */
if ((from + len) > mtd->size)
return -EINVAL;
memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(sflash->window + from),
len);
return len;
}
static void bcm47xxsflash_fill_mtd(struct bcma_sflash *sflash,
struct mtd_info *mtd)
{
mtd->priv = sflash;
mtd->name = "bcm47xxsflash";
mtd->owner = THIS_MODULE;
mtd->type = MTD_ROM;
mtd->size = sflash->size;
mtd->_read = bcm47xxsflash_read;
/* TODO: implement writing support and verify/change following code */
mtd->flags = MTD_CAP_ROM;
mtd->writebufsize = mtd->writesize = 1;
}
static int bcm47xxsflash_probe(struct platform_device *pdev)
{
struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
int err;
sflash->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
if (!sflash->mtd) {
err = -ENOMEM;
goto out;
}
bcm47xxsflash_fill_mtd(sflash, sflash->mtd);
err = mtd_device_parse_register(sflash->mtd, probes, NULL, NULL, 0);
if (err) {
pr_err("Failed to register MTD device: %d\n", err);
goto err_dev_reg;
}
return 0;
err_dev_reg:
kfree(sflash->mtd);
out:
return err;
}
static int bcm47xxsflash_remove(struct platform_device *pdev)
{
struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
mtd_device_unregister(sflash->mtd);
kfree(sflash->mtd);
return 0;
}
static struct platform_driver bcma_sflash_driver = {
.remove = bcm47xxsflash_remove,
.driver = {
.name = "bcma_sflash",
.owner = THIS_MODULE,
},
};
static int __init bcm47xxsflash_init(void)
{
int err;
err = platform_driver_probe(&bcma_sflash_driver, bcm47xxsflash_probe);
if (err)
pr_err("Failed to register BCMA serial flash driver: %d\n",
err);
return err;
}
static void __exit bcm47xxsflash_exit(void)
{
platform_driver_unregister(&bcma_sflash_driver);
}
module_init(bcm47xxsflash_init);
module_exit(bcm47xxsflash_exit);
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