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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | // 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_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.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; 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"); |