LXR linux/drivers/mtd/nand/plat

   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/err.h>
  13#include <linux/io.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16#include <linux/slab.h>
  17#include <linux/mtd/mtd.h>
  18#include <linux/mtd/nand.h>
  19#include <linux/mtd/partitions.h>
  20
  21struct plat_nand_data {
  22        struct nand_chip        chip;
  23        struct mtd_info         mtd;
  24        void __iomem            *io_base;
  25};
  26
  27static const char *part_probe_types[] = { "cmdlinepart", NULL };
  28
  29/*
  30 * Probe for the NAND device.
  31 */
  32static int plat_nand_probe(struct platform_device *pdev)
  33{
  34        struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
  35        struct mtd_part_parser_data ppdata;
  36        struct plat_nand_data *data;
  37        struct resource *res;
  38        const char **part_types;
  39        int err = 0;
  40
  41        if (!pdata) {
  42                dev_err(&pdev->dev, "platform_nand_data is missing\n");
  43                return -EINVAL;
  44        }
  45
  46        if (pdata->chip.nr_chips < 1) {
  47                dev_err(&pdev->dev, "invalid number of chips specified\n");
  48                return -EINVAL;
  49        }
  50
  51        /* Allocate memory for the device structure (and zero it) */
  52        data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
  53                            GFP_KERNEL);
  54        if (!data)
  55                return -ENOMEM;
  56
  57        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  58        data->io_base = devm_ioremap_resource(&pdev->dev, res);
  59        if (IS_ERR(data->io_base))
  60                return PTR_ERR(data->io_base);
  61
  62        data->chip.priv = &data;
  63        data->mtd.priv = &data->chip;
  64        data->mtd.owner = THIS_MODULE;
  65        data->mtd.name = dev_name(&pdev->dev);
  66
  67        data->chip.IO_ADDR_R = data->io_base;
  68        data->chip.IO_ADDR_W = data->io_base;
  69        data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
  70        data->chip.dev_ready = pdata->ctrl.dev_ready;
  71        data->chip.select_chip = pdata->ctrl.select_chip;
  72        data->chip.write_buf = pdata->ctrl.write_buf;
  73        data->chip.read_buf = pdata->ctrl.read_buf;
  74        data->chip.read_byte = pdata->ctrl.read_byte;
  75        data->chip.chip_delay = pdata->chip.chip_delay;
  76        data->chip.options |= pdata->chip.options;
  77        data->chip.bbt_options |= pdata->chip.bbt_options;
  78
  79        data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
  80        data->chip.ecc.layout = pdata->chip.ecclayout;
  81        data->chip.ecc.mode = NAND_ECC_SOFT;
  82
  83        platform_set_drvdata(pdev, data);
  84
  85        /* Handle any platform specific setup */
  86        if (pdata->ctrl.probe) {
  87                err = pdata->ctrl.probe(pdev);
  88                if (err)
  89                        goto out;
  90        }
  91
  92        /* Scan to find existence of the device */
  93        if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
  94                err = -ENXIO;
  95                goto out;
  96        }
  97
  98        part_types = pdata->chip.part_probe_types ? : part_probe_types;
  99
 100        ppdata.of_node = pdev->dev.of_node;
 101        err = mtd_device_parse_register(&data->mtd, part_types, &ppdata,
 102                                        pdata->chip.partitions,
 103                                        pdata->chip.nr_partitions);
 104
 105        if (!err)
 106                return err;
 107
 108        nand_release(&data->mtd);
 109out:
 110        if (pdata->ctrl.remove)
 111                pdata->ctrl.remove(pdev);
 112        return err;
 113}
 114
 115/*
 116 * Remove a NAND device.
 117 */
 118static int plat_nand_remove(struct platform_device *pdev)
 119{
 120        struct plat_nand_data *data = platform_get_drvdata(pdev);
 121        struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
 122
 123        nand_release(&data->mtd);
 124        if (pdata->ctrl.remove)
 125                pdata->ctrl.remove(pdev);
 126
 127        return 0;
 128}
 129
 130static const struct of_device_id plat_nand_match[] = {
 131        { .compatible = "gen_nand" },
 132        {},
 133};
 134MODULE_DEVICE_TABLE(of, plat_nand_match);
 135
 136static struct platform_driver plat_nand_driver = {
 137        .probe  = plat_nand_probe,
 138        .remove = plat_nand_remove,
 139        .driver = {
 140                .name           = "gen_nand",
 141                .of_match_table = plat_nand_match,
 142        },
 143};
 144
 145module_platform_driver(plat_nand_driver);
 146
 147MODULE_LICENSE("GPL");
 148MODULE_AUTHOR("Vitaly Wool");
 149MODULE_DESCRIPTION("Simple generic NAND driver");
 150MODULE_ALIAS("platform:gen_nand");
 151