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         int                     nr_parts;
  25         struct mtd_partition    *parts;
  26 };
  27
  28 /*
  29  * Probe for the NAND device.
  30  */
  31 static int __devinit plat_nand_probe(struct platform_device *pdev)
  32 {
  33         struct platform_nand_data *pdata = pdev->dev.platform_data;
  34         struct plat_nand_data *data;
  35         struct resource *res;
  36         int err = 0;
  37
  38         if (pdata->chip.nr_chips < 1) {
  39                 dev_err(&pdev->dev, "invalid number of chips specified\n");
  40                 return -EINVAL;
  41         }
  42
  43         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  44         if (!res)
  45                 return -ENXIO;
  46
  47         /* Allocate memory for the device structure (and zero it) */
  48         data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
  49         if (!data) {
  50                 dev_err(&pdev->dev, "failed to allocate device structure.\n");
  51                 return -ENOMEM;
  52         }
  53
  54         if (!request_mem_region(res->start, resource_size(res),
  55                                 dev_name(&pdev->dev))) {
  56                 dev_err(&pdev->dev, "request_mem_region failed\n");
  57                 err = -EBUSY;
  58                 goto out_free;
  59         }
  60
  61         data->io_base = ioremap(res->start, resource_size(res));
  62         if (data->io_base == NULL) {
  63                 dev_err(&pdev->dev, "ioremap failed\n");
  64                 err = -EIO;
  65                 goto out_release_io;
  66         }
  67
  68         data->chip.priv = &data;
  69         data->mtd.priv = &data->chip;
  70         data->mtd.owner = THIS_MODULE;
  71         data->mtd.name = dev_name(&pdev->dev);
  72
  73         data->chip.IO_ADDR_R = data->io_base;
  74         data->chip.IO_ADDR_W = data->io_base;
  75         data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
  76         data->chip.dev_ready = pdata->ctrl.dev_ready;
  77         data->chip.select_chip = pdata->ctrl.select_chip;
  78         data->chip.write_buf = pdata->ctrl.write_buf;
  79         data->chip.read_buf = pdata->ctrl.read_buf;
  80         data->chip.chip_delay = pdata->chip.chip_delay;
  81         data->chip.options |= pdata->chip.options;
  82
  83         data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
  84         data->chip.ecc.layout = pdata->chip.ecclayout;
  85         data->chip.ecc.mode = NAND_ECC_SOFT;
  86
  87         platform_set_drvdata(pdev, data);
  88
  89         /* Handle any platform specific setup */
  90         if (pdata->ctrl.probe) {
  91                 err = pdata->ctrl.probe(pdev);
  92                 if (err)
  93                         goto out;
  94         }
  95
  96         /* Scan to find existence of the device */
  97         if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
  98                 err = -ENXIO;
  99                 goto out;
 100         }
 101
 102         if (pdata->chip.part_probe_types) {
 103                 err = parse_mtd_partitions(&data->mtd,
 104                                         pdata->chip.part_probe_types,
 105                                         &data->parts, 0);
 106                 if (err > 0) {
 107                         mtd_device_register(&data->mtd, data->parts, err);
 108                         return 0;
 109                 }
 110         }
 111         if (pdata->chip.set_parts)
 112                 pdata->chip.set_parts(data->mtd.size, &pdata->chip);
 113         if (pdata->chip.partitions) {
 114                 data->parts = pdata->chip.partitions;
 115                 err = mtd_device_register(&data->mtd, data->parts,
 116                         pdata->chip.nr_partitions);
 117         } else
 118                 err = mtd_device_register(&data->mtd, NULL, 0);
 119
 120         if (!err)
 121                 return err;
 122
 123         nand_release(&data->mtd);
 124 out:
 125         if (pdata->ctrl.remove)
 126                 pdata->ctrl.remove(pdev);
 127         platform_set_drvdata(pdev, NULL);
 128         iounmap(data->io_base);
 129 out_release_io:
 130         release_mem_region(res->start, resource_size(res));
 131 out_free:
 132         kfree(data);
 133         return err;
 134 }
 135
 136 /*
 137  * Remove a NAND device.
 138  */
 139 static int __devexit plat_nand_remove(struct platform_device *pdev)
 140 {
 141         struct plat_nand_data *data = platform_get_drvdata(pdev);
 142         struct platform_nand_data *pdata = pdev->dev.platform_data;
 143         struct resource *res;
 144
 145         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 146
 147         nand_release(&data->mtd);
 148         if (data->parts && data->parts != pdata->chip.partitions)
 149                 kfree(data->parts);
 150         if (pdata->ctrl.remove)
 151                 pdata->ctrl.remove(pdev);
 152         iounmap(data->io_base);
 153         release_mem_region(res->start, resource_size(res));
 154         kfree(data);
 155
 156         return 0;
 157 }
 158
 159 static struct platform_driver plat_nand_driver = {
 160         .probe          = plat_nand_probe,
 161         .remove         = __devexit_p(plat_nand_remove),
 162         .driver         = {
 163                 .name   = "gen_nand",
 164                 .owner  = THIS_MODULE,
 165         },
 166 };
 167
 168 static int __init plat_nand_init(void)
 169 {
 170         return platform_driver_register(&plat_nand_driver);
 171 }
 172
 173 static void __exit plat_nand_exit(void)
 174 {
 175         platform_driver_unregister(&plat_nand_driver);
 176 }
 177
 178 module_init(plat_nand_init);
 179 module_exit(plat_nand_exit);
 180
 181 MODULE_LICENSE("GPL");
 182 MODULE_AUTHOR("Vitaly Wool");
 183 MODULE_DESCRIPTION("Simple generic NAND driver");
 184 MODULE_ALIAS("platform:gen_nand");