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 };
  25
  26 /*
  27  * Probe for the NAND device.
  28  */
  29 static int __devinit plat_nand_probe(struct platform_device *pdev)
  30 {
  31         struct platform_nand_data *pdata = pdev->dev.platform_data;
  32         struct plat_nand_data *data;
  33         struct resource *res;
  34         int err = 0;
  35
  36         if (pdata->chip.nr_chips < 1) {
  37                 dev_err(&pdev->dev, "invalid number of chips specified\n");
  38                 return -EINVAL;
  39         }
  40
  41         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  42         if (!res)
  43                 return -ENXIO;
  44
  45         /* Allocate memory for the device structure (and zero it) */
  46         data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
  47         if (!data) {
  48                 dev_err(&pdev->dev, "failed to allocate device structure.\n");
  49                 return -ENOMEM;
  50         }
  51
  52         if (!request_mem_region(res->start, resource_size(res),
  53                                 dev_name(&pdev->dev))) {
  54                 dev_err(&pdev->dev, "request_mem_region failed\n");
  55                 err = -EBUSY;
  56                 goto out_free;
  57         }
  58
  59         data->io_base = ioremap(res->start, resource_size(res));
  60         if (data->io_base == NULL) {
  61                 dev_err(&pdev->dev, "ioremap failed\n");
  62                 err = -EIO;
  63                 goto out_release_io;
  64         }
  65
  66         data->chip.priv = &data;
  67         data->mtd.priv = &data->chip;
  68         data->mtd.owner = THIS_MODULE;
  69         data->mtd.name = dev_name(&pdev->dev);
  70
  71         data->chip.IO_ADDR_R = data->io_base;
  72         data->chip.IO_ADDR_W = data->io_base;
  73         data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
  74         data->chip.dev_ready = pdata->ctrl.dev_ready;
  75         data->chip.select_chip = pdata->ctrl.select_chip;
  76         data->chip.write_buf = pdata->ctrl.write_buf;
  77         data->chip.read_buf = pdata->ctrl.read_buf;
  78         data->chip.chip_delay = pdata->chip.chip_delay;
  79         data->chip.options |= pdata->chip.options;
  80         data->chip.bbt_options |= pdata->chip.bbt_options;
  81
  82         data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
  83         data->chip.ecc.layout = pdata->chip.ecclayout;
  84         data->chip.ecc.mode = NAND_ECC_SOFT;
  85
  86         platform_set_drvdata(pdev, data);
  87
  88         /* Handle any platform specific setup */
  89         if (pdata->ctrl.probe) {
  90                 err = pdata->ctrl.probe(pdev);
  91                 if (err)
  92                         goto out;
  93         }
  94
  95         /* Scan to find existence of the device */
  96         if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
  97                 err = -ENXIO;
  98                 goto out;
  99         }
 100
 101         err = mtd_device_parse_register(&data->mtd,
 102                         pdata->chip.part_probe_types, 0,
 103                         pdata->chip.partitions, 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         platform_set_drvdata(pdev, NULL);
 113         iounmap(data->io_base);
 114 out_release_io:
 115         release_mem_region(res->start, resource_size(res));
 116 out_free:
 117         kfree(data);
 118         return err;
 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         struct resource *res;
 129
 130         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 131
 132         nand_release(&data->mtd);
 133         if (pdata->ctrl.remove)
 134                 pdata->ctrl.remove(pdev);
 135         iounmap(data->io_base);
 136         release_mem_region(res->start, resource_size(res));
 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");