drivers/mtd/nand/raw/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/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
  20 struct plat_nand_data {
  21         struct nand_chip        chip;
  22         void __iomem            *io_base;
  23 };
  24
  25 /*
  26  * Probe for the NAND device.
  27  */
  28 static 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);
 100 out:
 101         if (pdata->ctrl.remove)
 102                 pdata->ctrl.remove(pdev);
 103         return err;
 104 }
 105
 106 /*
 107  * Remove a NAND device.
 108  */
 109 static 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
 121 static const struct of_device_id plat_nand_match[] = {
 122         { .compatible = "gen_nand" },
 123         {},
 124 };
 125 MODULE_DEVICE_TABLE(of, plat_nand_match);
 126
 127 static 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
 136 module_platform_driver(plat_nand_driver);
 137
 138 MODULE_LICENSE("GPL");
 139 MODULE_AUTHOR("Vitaly Wool");
 140 MODULE_DESCRIPTION("Simple generic NAND driver");
 141 MODULE_ALIAS("platform:gen_nand");