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157 lines
3.8 KiB
157 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Generic NAND driver |
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* |
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* Author: Vitaly Wool <[email protected]> |
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*/ |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/platnand.h> |
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struct plat_nand_data { |
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struct nand_controller controller; |
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struct nand_chip chip; |
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void __iomem *io_base; |
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}; |
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static int plat_nand_attach_chip(struct nand_chip *chip) |
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{ |
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chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; |
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if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) |
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chip->ecc.algo = NAND_ECC_ALGO_HAMMING; |
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return 0; |
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} |
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static const struct nand_controller_ops plat_nand_ops = { |
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.attach_chip = plat_nand_attach_chip, |
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}; |
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/* |
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* Probe for the NAND device. |
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*/ |
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static int plat_nand_probe(struct platform_device *pdev) |
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{ |
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struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); |
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struct plat_nand_data *data; |
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struct mtd_info *mtd; |
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struct resource *res; |
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const char **part_types; |
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int err = 0; |
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if (!pdata) { |
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dev_err(&pdev->dev, "platform_nand_data is missing\n"); |
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return -EINVAL; |
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} |
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if (pdata->chip.nr_chips < 1) { |
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dev_err(&pdev->dev, "invalid number of chips specified\n"); |
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return -EINVAL; |
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} |
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/* Allocate memory for the device structure (and zero it) */ |
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data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data), |
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GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->controller.ops = &plat_nand_ops; |
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nand_controller_init(&data->controller); |
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data->chip.controller = &data->controller; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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data->io_base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(data->io_base)) |
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return PTR_ERR(data->io_base); |
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nand_set_flash_node(&data->chip, pdev->dev.of_node); |
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mtd = nand_to_mtd(&data->chip); |
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mtd->dev.parent = &pdev->dev; |
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data->chip.legacy.IO_ADDR_R = data->io_base; |
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data->chip.legacy.IO_ADDR_W = data->io_base; |
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data->chip.legacy.cmd_ctrl = pdata->ctrl.cmd_ctrl; |
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data->chip.legacy.dev_ready = pdata->ctrl.dev_ready; |
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data->chip.legacy.select_chip = pdata->ctrl.select_chip; |
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data->chip.legacy.write_buf = pdata->ctrl.write_buf; |
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data->chip.legacy.read_buf = pdata->ctrl.read_buf; |
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data->chip.legacy.chip_delay = pdata->chip.chip_delay; |
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data->chip.options |= pdata->chip.options; |
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data->chip.bbt_options |= pdata->chip.bbt_options; |
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platform_set_drvdata(pdev, data); |
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/* Handle any platform specific setup */ |
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if (pdata->ctrl.probe) { |
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err = pdata->ctrl.probe(pdev); |
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if (err) |
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goto out; |
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} |
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/* Scan to find existence of the device */ |
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err = nand_scan(&data->chip, pdata->chip.nr_chips); |
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if (err) |
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goto out; |
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part_types = pdata->chip.part_probe_types; |
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err = mtd_device_parse_register(mtd, part_types, NULL, |
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pdata->chip.partitions, |
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pdata->chip.nr_partitions); |
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if (!err) |
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return err; |
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nand_cleanup(&data->chip); |
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out: |
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if (pdata->ctrl.remove) |
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pdata->ctrl.remove(pdev); |
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return err; |
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} |
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/* |
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* Remove a NAND device. |
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*/ |
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static int plat_nand_remove(struct platform_device *pdev) |
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{ |
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struct plat_nand_data *data = platform_get_drvdata(pdev); |
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struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev); |
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struct nand_chip *chip = &data->chip; |
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int ret; |
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ret = mtd_device_unregister(nand_to_mtd(chip)); |
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WARN_ON(ret); |
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nand_cleanup(chip); |
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if (pdata->ctrl.remove) |
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pdata->ctrl.remove(pdev); |
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return 0; |
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} |
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static const struct of_device_id plat_nand_match[] = { |
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{ .compatible = "gen_nand" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, plat_nand_match); |
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static struct platform_driver plat_nand_driver = { |
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.probe = plat_nand_probe, |
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.remove = plat_nand_remove, |
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.driver = { |
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.name = "gen_nand", |
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.of_match_table = plat_nand_match, |
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}, |
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}; |
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module_platform_driver(plat_nand_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Vitaly Wool"); |
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MODULE_DESCRIPTION("Simple generic NAND driver"); |
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MODULE_ALIAS("platform:gen_nand");
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