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 static const char *part_probe_types[] = { "cmdlinepart", NULL };
  28
  29 /*
  30  * Probe for the NAND device.
  31  */
  32 static int plat_nand_probe(struct platform_device *pdev)
  33 {
  34         struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
  35         struct mtd_part_parser_data ppdata;
  36         struct plat_nand_data *data;
  37         struct resource *res;
  38         const char **part_types;
  39         int err = 0;
  40
  41         if (!pdata) {
  42                 dev_err(&pdev->dev, "platform_nand_data is missing\n");
  43                 return -EINVAL;
  44         }
  45
  46         if (pdata->chip.nr_chips < 1) {
  47                 dev_err(&pdev->dev, "invalid number of chips specified\n");
  48                 return -EINVAL;
  49         }
  50
  51         /* Allocate memory for the device structure (and zero it) */
  52         data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
  53                             GFP_KERNEL);
  54         if (!data)
  55                 return -ENOMEM;
  56
  57         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  58         data->io_base = devm_ioremap_resource(&pdev->dev, res);
  59         if (IS_ERR(data->io_base))
  60                 return PTR_ERR(data->io_base);
  61
  62         data->chip.priv = &data;
  63         data->mtd.priv = &data->chip;
  64         data->mtd.owner = THIS_MODULE;
  65         data->mtd.name = dev_name(&pdev->dev);
  66
  67         data->chip.IO_ADDR_R = data->io_base;
  68         data->chip.IO_ADDR_W = data->io_base;
  69         data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
  70         data->chip.dev_ready = pdata->ctrl.dev_ready;
  71         data->chip.select_chip = pdata->ctrl.select_chip;
  72         data->chip.write_buf = pdata->ctrl.write_buf;
  73         data->chip.read_buf = pdata->ctrl.read_buf;
  74         data->chip.read_byte = pdata->ctrl.read_byte;
  75         data->chip.chip_delay = pdata->chip.chip_delay;
  76         data->chip.options |= pdata->chip.options;
  77         data->chip.bbt_options |= pdata->chip.bbt_options;
  78
  79         data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
  80         data->chip.ecc.layout = pdata->chip.ecclayout;
  81         data->chip.ecc.mode = NAND_ECC_SOFT;
  82
  83         platform_set_drvdata(pdev, data);
  84
  85         /* Handle any platform specific setup */
  86         if (pdata->ctrl.probe) {
  87                 err = pdata->ctrl.probe(pdev);
  88                 if (err)
  89                         goto out;
  90         }
  91
  92         /* Scan to find existence of the device */
  93         if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
  94                 err = -ENXIO;
  95                 goto out;
  96         }
  97
  98         part_types = pdata->chip.part_probe_types ? : part_probe_types;
  99
 100         ppdata.of_node = pdev->dev.of_node;
 101         err = mtd_device_parse_register(&data->mtd, part_types, &ppdata,
 102                                         pdata->chip.partitions,
 103                                         pdata->chip.nr_partitions);
 104
 105         if (!err)
 106                 return err;
 107
 108         nand_release(&data->mtd);
 109 out:
 110         if (pdata->ctrl.remove)
 111                 pdata->ctrl.remove(pdev);
 112         return err;
 113 }
 114
 115 /*
 116  * Remove a NAND device.
 117  */
 118 static int plat_nand_remove(struct platform_device *pdev)
 119 {
 120         struct plat_nand_data *data = platform_get_drvdata(pdev);
 121         struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
 122
 123         nand_release(&data->mtd);
 124         if (pdata->ctrl.remove)
 125                 pdata->ctrl.remove(pdev);
 126
 127         return 0;
 128 }
 129
 130 static const struct of_device_id plat_nand_match[] = {
 131         { .compatible = "gen_nand" },
 132         {},
 133 };
 134 MODULE_DEVICE_TABLE(of, plat_nand_match);
 135
 136 static struct platform_driver plat_nand_driver = {
 137         .probe  = plat_nand_probe,
 138         .remove = plat_nand_remove,
 139         .driver = {
 140                 .name           = "gen_nand",
 141                 .owner          = THIS_MODULE,
 142                 .of_match_table = plat_nand_match,
 143         },
 144 };
 145
 146 module_platform_driver(plat_nand_driver);
 147
 148 MODULE_LICENSE("GPL");
 149 MODULE_AUTHOR("Vitaly Wool");
 150 MODULE_DESCRIPTION("Simple generic NAND driver");
 151 MODULE_ALIAS("platform:gen_nand");