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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 static const char *part_probe_types[] = { "cmdlinepart", NULL };
 28 
 29 /*
 30  * Probe for the NAND device.
 31  */
 32 static 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);
109 out:
110         if (pdata->ctrl.remove)
111                 pdata->ctrl.remove(pdev);
112         return err;
113 }
114 
115 /*
116  * Remove a NAND device.
117  */
118 static 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 
130 static const struct of_device_id plat_nand_match[] = {
131         { .compatible = "gen_nand" },
132         {},
133 };
134 MODULE_DEVICE_TABLE(of, plat_nand_match);
135 
136 static struct platform_driver plat_nand_driver = {
137         .probe  = plat_nand_probe,
138         .remove = plat_nand_remove,
139         .driver = {
140                 .name           = "gen_nand",
141                 .owner          = THIS_MODULE,
142                 .of_match_table = plat_nand_match,
143         },
144 };
145 
146 module_platform_driver(plat_nand_driver);
147 
148 MODULE_LICENSE("GPL");
149 MODULE_AUTHOR("Vitaly Wool");
150 MODULE_DESCRIPTION("Simple generic NAND driver");
151 MODULE_ALIAS("platform:gen_nand");
152 

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