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

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