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