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