drivers/mtd/nand/plat_nand.c

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