diff options
Diffstat (limited to 'drivers/mtd/nand/raw/plat_nand.c')
| -rw-r--r-- | drivers/mtd/nand/raw/plat_nand.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/plat_nand.c b/drivers/mtd/nand/raw/plat_nand.c new file mode 100644 index 000000000..b5c374b51 --- /dev/null +++ b/drivers/mtd/nand/raw/plat_nand.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic NAND driver + * + * Author: Vitaly Wool <vitalywool@gmail.com> + */ + +#include <linux/err.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/platnand.h> + +struct plat_nand_data { + struct nand_controller controller; + struct nand_chip chip; + void __iomem *io_base; +}; + +static int plat_nand_attach_chip(struct nand_chip *chip) +{ + if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT && + chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) + chip->ecc.algo = NAND_ECC_ALGO_HAMMING; + + return 0; +} + +static const struct nand_controller_ops plat_nand_ops = { + .attach_chip = plat_nand_attach_chip, +}; + +/* + * Probe for the NAND device. + */ +static int plat_nand_probe(struct platform_device *pdev) +{ + struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); + struct plat_nand_data *data; + struct mtd_info *mtd; + const char **part_types; + int err = 0; + + if (!pdata) { + dev_err(&pdev->dev, "platform_nand_data is missing\n"); + return -EINVAL; + } + + if (pdata->chip.nr_chips < 1) { + dev_err(&pdev->dev, "invalid number of chips specified\n"); + return -EINVAL; + } + + /* Allocate memory for the device structure (and zero it) */ + data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data), + GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->controller.ops = &plat_nand_ops; + nand_controller_init(&data->controller); + data->chip.controller = &data->controller; + + data->io_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(data->io_base)) + return PTR_ERR(data->io_base); + + nand_set_flash_node(&data->chip, pdev->dev.of_node); + mtd = nand_to_mtd(&data->chip); + mtd->dev.parent = &pdev->dev; + + data->chip.legacy.IO_ADDR_R = data->io_base; + data->chip.legacy.IO_ADDR_W = data->io_base; + data->chip.legacy.cmd_ctrl = pdata->ctrl.cmd_ctrl; + data->chip.legacy.dev_ready = pdata->ctrl.dev_ready; + data->chip.legacy.select_chip = pdata->ctrl.select_chip; + data->chip.legacy.write_buf = pdata->ctrl.write_buf; + data->chip.legacy.read_buf = pdata->ctrl.read_buf; + data->chip.legacy.chip_delay = pdata->chip.chip_delay; + data->chip.options |= pdata->chip.options; + data->chip.bbt_options |= pdata->chip.bbt_options; + + platform_set_drvdata(pdev, data); + + /* Handle any platform specific setup */ + if (pdata->ctrl.probe) { + err = pdata->ctrl.probe(pdev); + if (err) + goto out; + } + + /* + * This driver assumes that the default ECC engine should be TYPE_SOFT. + * Set ->engine_type before registering the NAND devices in order to + * provide a driver specific default value. + */ + data->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; + + /* Scan to find existence of the device */ + err = nand_scan(&data->chip, pdata->chip.nr_chips); + if (err) + goto out; + + part_types = pdata->chip.part_probe_types; + + err = mtd_device_parse_register(mtd, part_types, NULL, + pdata->chip.partitions, + pdata->chip.nr_partitions); + + if (!err) + return err; + + nand_cleanup(&data->chip); +out: + if (pdata->ctrl.remove) + pdata->ctrl.remove(pdev); + return err; +} + +/* + * Remove a NAND device. + */ +static void plat_nand_remove(struct platform_device *pdev) +{ + struct plat_nand_data *data = platform_get_drvdata(pdev); + struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); + struct nand_chip *chip = &data->chip; + int ret; + + ret = mtd_device_unregister(nand_to_mtd(chip)); + WARN_ON(ret); + nand_cleanup(chip); + if (pdata->ctrl.remove) + pdata->ctrl.remove(pdev); +} + +static const struct of_device_id plat_nand_match[] = { + { .compatible = "gen_nand" }, + {}, +}; +MODULE_DEVICE_TABLE(of, plat_nand_match); + +static struct platform_driver plat_nand_driver = { + .probe = plat_nand_probe, + .remove_new = plat_nand_remove, + .driver = { + .name = "gen_nand", + .of_match_table = plat_nand_match, + }, +}; + +module_platform_driver(plat_nand_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Vitaly Wool"); +MODULE_DESCRIPTION("Simple generic NAND driver"); +MODULE_ALIAS("platform:gen_nand"); |