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, NULL,
 103                                         pdata->chip.partitions,
 104                                         pdata->chip.nr_partitions);
 105
 106         if (!err)
 107                 return err;
 108
 109         nand_release(&data->mtd);
 110 out:
 111         if (pdata->ctrl.remove)
 112                 pdata->ctrl.remove(pdev);
 113         platform_set_drvdata(pdev, NULL);
 114         iounmap(data->io_base);
 115 out_release_io:
 116         release_mem_region(res->start, resource_size(res));
 117 out_free:
 118         kfree(data);
 119         return err;
 120 }
 121
 122 /*
 123  * Remove a NAND device.
 124  */
 125 static int __devexit plat_nand_remove(struct platform_device *pdev)
 126 {
 127         struct plat_nand_data *data = platform_get_drvdata(pdev);
 128         struct platform_nand_data *pdata = pdev->dev.platform_data;
 129         struct resource *res;
 130
 131         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 132
 133         nand_release(&data->mtd);
 134         if (pdata->ctrl.remove)
 135                 pdata->ctrl.remove(pdev);
 136         iounmap(data->io_base);
 137         release_mem_region(res->start, resource_size(res));
 138         kfree(data);
 139
 140         return 0;
 141 }
 142
 143 static struct platform_driver plat_nand_driver = {
 144         .probe          = plat_nand_probe,
 145         .remove         = __devexit_p(plat_nand_remove),
 146         .driver         = {
 147                 .name   = "gen_nand",
 148                 .owner  = THIS_MODULE,
 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");