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         struct resource *res;
  38         int err = 0;
  39
  40         if (pdata->chip.nr_chips < 1) {
  41                 dev_err(&pdev->dev, "invalid number of chips specified\n");
  42                 return -EINVAL;
  43         }
  44
  45         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  46         if (!res)
  47                 return -ENXIO;
  48
  49         /* Allocate memory for the device structure (and zero it) */
  50         data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
  51         if (!data) {
  52                 dev_err(&pdev->dev, "failed to allocate device structure.\n");
  53                 return -ENOMEM;
  54         }
  55
  56         if (!request_mem_region(res->start, resource_size(res),
  57                                 dev_name(&pdev->dev))) {
  58                 dev_err(&pdev->dev, "request_mem_region failed\n");
  59                 err = -EBUSY;
  60                 goto out_free;
  61         }
  62
  63         data->io_base = ioremap(res->start, resource_size(res));
  64         if (data->io_base == NULL) {
  65                 dev_err(&pdev->dev, "ioremap failed\n");
  66                 err = -EIO;
  67                 goto out_release_io;
  68         }
  69
  70         data->chip.priv = &data;
  71         data->mtd.priv = &data->chip;
  72         data->mtd.owner = THIS_MODULE;
  73         data->mtd.name = dev_name(&pdev->dev);
  74
  75         data->chip.IO_ADDR_R = data->io_base;
  76         data->chip.IO_ADDR_W = data->io_base;
  77         data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
  78         data->chip.dev_ready = pdata->ctrl.dev_ready;
  79         data->chip.select_chip = pdata->ctrl.select_chip;
  80         data->chip.write_buf = pdata->ctrl.write_buf;
  81         data->chip.read_buf = pdata->ctrl.read_buf;
  82         data->chip.chip_delay = pdata->chip.chip_delay;
  83         data->chip.options |= pdata->chip.options;
  84
  85         data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
  86         data->chip.ecc.layout = pdata->chip.ecclayout;
  87         data->chip.ecc.mode = NAND_ECC_SOFT;
  88
  89         platform_set_drvdata(pdev, data);
  90
  91         /* Handle any platform specific setup */
  92         if (pdata->ctrl.probe) {
  93                 err = pdata->ctrl.probe(pdev);
  94                 if (err)
  95                         goto out;
  96         }
  97
  98         /* Scan to find existence of the device */
  99         if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
 100                 err = -ENXIO;
 101                 goto out;
 102         }
 103
 104 #ifdef CONFIG_MTD_PARTITIONS
 105         if (pdata->chip.part_probe_types) {
 106                 err = parse_mtd_partitions(&data->mtd,
 107                                         pdata->chip.part_probe_types,
 108                                         &data->parts, 0);
 109                 if (err > 0) {
 110                         add_mtd_partitions(&data->mtd, data->parts, err);
 111                         return 0;
 112                 }
 113         }
 114         if (pdata->chip.set_parts)
 115                 pdata->chip.set_parts(data->mtd.size, &pdata->chip);
 116         if (pdata->chip.partitions) {
 117                 data->parts = pdata->chip.partitions;
 118                 err = add_mtd_partitions(&data->mtd, data->parts,
 119                         pdata->chip.nr_partitions);
 120         } else
 121 #endif
 122         err = add_mtd_device(&data->mtd);
 123
 124         if (!err)
 125                 return err;
 126
 127         nand_release(&data->mtd);
 128 out:
 129         if (pdata->ctrl.remove)
 130                 pdata->ctrl.remove(pdev);
 131         platform_set_drvdata(pdev, NULL);
 132         iounmap(data->io_base);
 133 out_release_io:
 134         release_mem_region(res->start, resource_size(res));
 135 out_free:
 136         kfree(data);
 137         return err;
 138 }
 139
 140 /*
 141  * Remove a NAND device.
 142  */
 143 static int __devexit plat_nand_remove(struct platform_device *pdev)
 144 {
 145         struct plat_nand_data *data = platform_get_drvdata(pdev);
 146         struct platform_nand_data *pdata = pdev->dev.platform_data;
 147         struct resource *res;
 148
 149         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 150
 151         nand_release(&data->mtd);
 152 #ifdef CONFIG_MTD_PARTITIONS
 153         if (data->parts && data->parts != pdata->chip.partitions)
 154                 kfree(data->parts);
 155 #endif
 156         if (pdata->ctrl.remove)
 157                 pdata->ctrl.remove(pdev);
 158         iounmap(data->io_base);
 159         release_mem_region(res->start, resource_size(res));
 160         kfree(data);
 161
 162         return 0;
 163 }
 164
 165 static struct platform_driver plat_nand_driver = {
 166         .probe          = plat_nand_probe,
 167         .remove         = __devexit_p(plat_nand_remove),
 168         .driver         = {
 169                 .name   = "gen_nand",
 170                 .owner  = THIS_MODULE,
 171         },
 172 };
 173
 174 static int __init plat_nand_init(void)
 175 {
 176         return platform_driver_register(&plat_nand_driver);
 177 }
 178
 179 static void __exit plat_nand_exit(void)
 180 {
 181         platform_driver_unregister(&plat_nand_driver);
 182 }
 183
 184 module_init(plat_nand_init);
 185 module_exit(plat_nand_exit);
 186
 187 MODULE_LICENSE("GPL");
 188 MODULE_AUTHOR("Vitaly Wool");
 189 MODULE_DESCRIPTION("Simple generic NAND driver");
 190 MODULE_ALIAS("platform:gen_nand");