127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
#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>
|
|
|
|
#include "bcm47xxsflash.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 bcm47xxsflash *b47s = mtd->priv;
|
|
|
|
/* Check address range */
|
|
if ((from + len) > mtd->size)
|
|
return -EINVAL;
|
|
|
|
memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
|
|
len);
|
|
*retlen = len;
|
|
|
|
return len;
|
|
}
|
|
|
|
static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
|
|
{
|
|
struct mtd_info *mtd = &b47s->mtd;
|
|
|
|
mtd->priv = b47s;
|
|
mtd->name = "bcm47xxsflash";
|
|
mtd->owner = THIS_MODULE;
|
|
mtd->type = MTD_ROM;
|
|
mtd->size = b47s->size;
|
|
mtd->_read = bcm47xxsflash_read;
|
|
|
|
/* TODO: implement writing support and verify/change following code */
|
|
mtd->flags = MTD_CAP_ROM;
|
|
mtd->writebufsize = mtd->writesize = 1;
|
|
}
|
|
|
|
/**************************************************
|
|
* BCMA
|
|
**************************************************/
|
|
|
|
static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
|
|
{
|
|
struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
|
|
struct bcm47xxsflash *b47s;
|
|
int err;
|
|
|
|
b47s = kzalloc(sizeof(*b47s), GFP_KERNEL);
|
|
if (!b47s) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
sflash->priv = b47s;
|
|
|
|
b47s->window = sflash->window;
|
|
b47s->blocksize = sflash->blocksize;
|
|
b47s->numblocks = sflash->numblocks;
|
|
b47s->size = sflash->size;
|
|
bcm47xxsflash_fill_mtd(b47s);
|
|
|
|
err = mtd_device_parse_register(&b47s->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(&b47s->mtd);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
|
|
{
|
|
struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
|
|
struct bcm47xxsflash *b47s = sflash->priv;
|
|
|
|
mtd_device_unregister(&b47s->mtd);
|
|
kfree(b47s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver bcma_sflash_driver = {
|
|
.probe = bcm47xxsflash_bcma_probe,
|
|
.remove = bcm47xxsflash_bcma_remove,
|
|
.driver = {
|
|
.name = "bcma_sflash",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
/**************************************************
|
|
* Init
|
|
**************************************************/
|
|
|
|
static int __init bcm47xxsflash_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = platform_driver_register(&bcma_sflash_driver);
|
|
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);
|