drivers/mtd/nand/raw/plat_nand.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic NAND driver
   4  *
   5  * Author: Vitaly Wool <vitalywool@gmail.com>
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/io.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/slab.h>
  13 #include <linux/mtd/mtd.h>
  14 #include <linux/mtd/platnand.h>
  15
  16 struct plat_nand_data {
  17         struct nand_controller  controller;
  18         struct nand_chip        chip;
  19         void __iomem            *io_base;
  20 };
  21
  22 static int plat_nand_attach_chip(struct nand_chip *chip)
  23 {
  24         chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
  25
  26         if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
  27                 chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
  28
  29         return 0;
  30 }
  31
  32 static const struct nand_controller_ops plat_nand_ops = {
  33         .attach_chip = plat_nand_attach_chip,
  34 };
  35
  36 /*
  37  * Probe for the NAND device.
  38  */
  39 static int plat_nand_probe(struct platform_device *pdev)
  40 {
  41         struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
  42         struct plat_nand_data *data;
  43         struct mtd_info *mtd;
  44         struct resource *res;
  45         const char **part_types;
  46         int err = 0;
  47
  48         if (!pdata) {
  49                 dev_err(&pdev->dev, "platform_nand_data is missing\n");
  50                 return -EINVAL;
  51         }
  52
  53         if (pdata->chip.nr_chips < 1) {
  54                 dev_err(&pdev->dev, "invalid number of chips specified\n");
  55                 return -EINVAL;
  56         }
  57
  58         /* Allocate memory for the device structure (and zero it) */
  59         data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
  60                             GFP_KERNEL);
  61         if (!data)
  62                 return -ENOMEM;
  63
  64         data->controller.ops = &plat_nand_ops;
  65         nand_controller_init(&data->controller);
  66         data->chip.controller = &data->controller;
  67
  68         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  69         data->io_base = devm_ioremap_resource(&pdev->dev, res);
  70         if (IS_ERR(data->io_base))
  71                 return PTR_ERR(data->io_base);
  72
  73         nand_set_flash_node(&data->chip, pdev->dev.of_node);
  74         mtd = nand_to_mtd(&data->chip);
  75         mtd->dev.parent = &pdev->dev;
  76
  77         data->chip.legacy.IO_ADDR_R = data->io_base;
  78         data->chip.legacy.IO_ADDR_W = data->io_base;
  79         data->chip.legacy.cmd_ctrl = pdata->ctrl.cmd_ctrl;
  80         data->chip.legacy.dev_ready = pdata->ctrl.dev_ready;
  81         data->chip.legacy.select_chip = pdata->ctrl.select_chip;
  82         data->chip.legacy.write_buf = pdata->ctrl.write_buf;
  83         data->chip.legacy.read_buf = pdata->ctrl.read_buf;
  84         data->chip.legacy.chip_delay = pdata->chip.chip_delay;
  85         data->chip.options |= pdata->chip.options;
  86         data->chip.bbt_options |= pdata->chip.bbt_options;
  87
  88         platform_set_drvdata(pdev, data);
  89
  90         /* Handle any platform specific setup */
  91         if (pdata->ctrl.probe) {
  92                 err = pdata->ctrl.probe(pdev);
  93                 if (err)
  94                         goto out;
  95         }
  96
  97         /* Scan to find existence of the device */
  98         err = nand_scan(&data->chip, pdata->chip.nr_chips);
  99         if (err)
 100                 goto out;
 101
 102         part_types = pdata->chip.part_probe_types;
 103
 104         err = mtd_device_parse_register(mtd, part_types, NULL,
 105                                         pdata->chip.partitions,
 106                                         pdata->chip.nr_partitions);
 107
 108         if (!err)
 109                 return err;
 110
 111         nand_cleanup(&data->chip);
 112 out:
 113         if (pdata->ctrl.remove)
 114                 pdata->ctrl.remove(pdev);
 115         return err;
 116 }
 117
 118 /*
 119  * Remove a NAND device.
 120  */
 121 static int plat_nand_remove(struct platform_device *pdev)
 122 {
 123         struct plat_nand_data *data = platform_get_drvdata(pdev);
 124         struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
 125         struct nand_chip *chip = &data->chip;
 126         int ret;
 127
 128         ret = mtd_device_unregister(nand_to_mtd(chip));
 129         WARN_ON(ret);
 130         nand_cleanup(chip);
 131         if (pdata->ctrl.remove)
 132                 pdata->ctrl.remove(pdev);
 133
 134         return 0;
 135 }
 136
 137 static const struct of_device_id plat_nand_match[] = {
 138         { .compatible = "gen_nand" },
 139         {},
 140 };
 141 MODULE_DEVICE_TABLE(of, plat_nand_match);
 142
 143 static struct platform_driver plat_nand_driver = {
 144         .probe  = plat_nand_probe,
 145         .remove = plat_nand_remove,
 146         .driver = {
 147                 .name           = "gen_nand",
 148                 .of_match_table = plat_nand_match,
 149         },
 150 };
 151
 152 module_platform_driver(plat_nand_driver);
 153
 154 MODULE_LICENSE("GPL");
 155 MODULE_AUTHOR("Vitaly Wool");
 156 MODULE_DESCRIPTION("Simple generic NAND driver");
 157 MODULE_ALIAS("platform:gen_nand");