/* * Generic NAND driver * * Author: Vitaly Wool * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include #include #include #include #include #include #include #include struct plat_nand_data { struct nand_chip chip; void __iomem *io_base; }; /* * 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; struct resource *res; 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; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); data->io_base = devm_ioremap_resource(&pdev->dev, res); 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.IO_ADDR_R = data->io_base; data->chip.IO_ADDR_W = data->io_base; data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl; data->chip.dev_ready = pdata->ctrl.dev_ready; data->chip.select_chip = pdata->ctrl.select_chip; data->chip.write_buf = pdata->ctrl.write_buf; data->chip.read_buf = pdata->ctrl.read_buf; data->chip.chip_delay = pdata->chip.chip_delay; data->chip.options |= pdata->chip.options; data->chip.bbt_options |= pdata->chip.bbt_options; data->chip.ecc.mode = NAND_ECC_SOFT; data->chip.ecc.algo = NAND_ECC_HAMMING; platform_set_drvdata(pdev, data); /* Handle any platform specific setup */ if (pdata->ctrl.probe) { err = pdata->ctrl.probe(pdev); if (err) goto out; } /* 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 int 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); nand_release(&data->chip); if (pdata->ctrl.remove) pdata->ctrl.remove(pdev); return 0; } 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 = 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");