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/io.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/nand.h>
  18 #include <linux/mtd/partitions.h>
  19
  20 struct plat_nand_data {
  21         struct nand_chip        chip;
  22         struct mtd_info         mtd;
  23         void __iomem            *io_base;
  24 #ifdef CONFIG_MTD_PARTITIONS
  25         int                     nr_parts;
  26         struct mtd_partition    *parts;
  27 #endif
  28 };
  29
  30 /*
  31  * Probe for the NAND device.
  32  */
  33 static int __devinit plat_nand_probe(struct platform_device *pdev)
  34 {
  35         struct platform_nand_data *pdata = pdev->dev.platform_data;
  36         struct plat_nand_data *data;
  37         int res = 0;
  38
  39         /* Allocate memory for the device structure (and zero it) */
  40         data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
  41         if (!data) {
  42                 dev_err(&pdev->dev, "failed to allocate device structure.\n");
  43                 return -ENOMEM;
  44         }
  45
  46         data->io_base = ioremap(pdev->resource[0].start,
  47                                 pdev->resource[0].end - pdev->resource[0].start + 1);
  48         if (data->io_base == NULL) {
  49                 dev_err(&pdev->dev, "ioremap failed\n");
  50                 kfree(data);
  51                 return -EIO;
  52         }
  53
  54         data->chip.priv = &data;
  55         data->mtd.priv = &data->chip;
  56         data->mtd.owner = THIS_MODULE;
  57         data->mtd.name = dev_name(&pdev->dev);
  58
  59         data->chip.IO_ADDR_R = data->io_base;
  60         data->chip.IO_ADDR_W = data->io_base;
  61         data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
  62         data->chip.dev_ready = pdata->ctrl.dev_ready;
  63         data->chip.select_chip = pdata->ctrl.select_chip;
  64         data->chip.write_buf = pdata->ctrl.write_buf;
  65         data->chip.read_buf = pdata->ctrl.read_buf;
  66         data->chip.chip_delay = pdata->chip.chip_delay;
  67         data->chip.options |= pdata->chip.options;
  68
  69         data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
  70         data->chip.ecc.layout = pdata->chip.ecclayout;
  71         data->chip.ecc.mode = NAND_ECC_SOFT;
  72
  73         platform_set_drvdata(pdev, data);
  74
  75         /* Handle any platform specific setup */
  76         if (pdata->ctrl.probe) {
  77                 res = pdata->ctrl.probe(pdev);
  78                 if (res)
  79                         goto out;
  80         }
  81
  82         /* Scan to find existance of the device */
  83         if (nand_scan(&data->mtd, 1)) {
  84                 res = -ENXIO;
  85                 goto out;
  86         }
  87
  88 #ifdef CONFIG_MTD_PARTITIONS
  89         if (pdata->chip.part_probe_types) {
  90                 res = parse_mtd_partitions(&data->mtd,
  91                                         pdata->chip.part_probe_types,
  92                                         &data->parts, 0);
  93                 if (res > 0) {
  94                         add_mtd_partitions(&data->mtd, data->parts, res);
  95                         return 0;
  96                 }
  97         }
  98         if (pdata->chip.set_parts)
  99                 pdata->chip.set_parts(data->mtd.size, &pdata->chip);
 100         if (pdata->chip.partitions) {
 101                 data->parts = pdata->chip.partitions;
 102                 res = add_mtd_partitions(&data->mtd, data->parts,
 103                         pdata->chip.nr_partitions);
 104         } else
 105 #endif
 106         res = add_mtd_device(&data->mtd);
 107
 108         if (!res)
 109                 return res;
 110
 111         nand_release(&data->mtd);
 112 out:
 113         if (pdata->ctrl.remove)
 114                 pdata->ctrl.remove(pdev);
 115         platform_set_drvdata(pdev, NULL);
 116         iounmap(data->io_base);
 117         kfree(data);
 118         return res;
 119 }
 120
 121 /*
 122  * Remove a NAND device.
 123  */
 124 static int __devexit plat_nand_remove(struct platform_device *pdev)
 125 {
 126         struct plat_nand_data *data = platform_get_drvdata(pdev);
 127         struct platform_nand_data *pdata = pdev->dev.platform_data;
 128
 129         nand_release(&data->mtd);
 130 #ifdef CONFIG_MTD_PARTITIONS
 131         if (data->parts && data->parts != pdata->chip.partitions)
 132                 kfree(data->parts);
 133 #endif
 134         if (pdata->ctrl.remove)
 135                 pdata->ctrl.remove(pdev);
 136         iounmap(data->io_base);
 137         kfree(data);
 138
 139         return 0;
 140 }
 141
 142 static struct platform_driver plat_nand_driver = {
 143         .probe          = plat_nand_probe,
 144         .remove         = __devexit_p(plat_nand_remove),
 145         .driver         = {
 146                 .name   = "gen_nand",
 147                 .owner  = THIS_MODULE,
 148         },
 149 };
 150
 151 static int __init plat_nand_init(void)
 152 {
 153         return platform_driver_register(&plat_nand_driver);
 154 }
 155
 156 static void __exit plat_nand_exit(void)
 157 {
 158         platform_driver_unregister(&plat_nand_driver);
 159 }
 160
 161 module_init(plat_nand_init);
 162 module_exit(plat_nand_exit);
 163
 164 MODULE_LICENSE("GPL");
 165 MODULE_AUTHOR("Vitaly Wool");
 166 MODULE_DESCRIPTION("Simple generic NAND driver");
 167 MODULE_ALIAS("platform:gen_nand");