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