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