4 * Author: Vitaly Wool <vitalywool@gmail.com>
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.
12 #include <linux/err.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>
20 struct plat_nand_data {
21 struct nand_chip chip;
22 void __iomem *io_base;
26 * Probe for the NAND device.
28 static int plat_nand_probe(struct platform_device *pdev)
30 struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
31 struct plat_nand_data *data;
34 const char **part_types;
38 dev_err(&pdev->dev, "platform_nand_data is missing\n");
42 if (pdata->chip.nr_chips < 1) {
43 dev_err(&pdev->dev, "invalid number of chips specified\n");
47 /* Allocate memory for the device structure (and zero it) */
48 data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
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);
58 nand_set_flash_node(&data->chip, pdev->dev.of_node);
59 mtd = nand_to_mtd(&data->chip);
60 mtd->dev.parent = &pdev->dev;
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;
73 data->chip.ecc.mode = NAND_ECC_SOFT;
74 data->chip.ecc.algo = NAND_ECC_HAMMING;
76 platform_set_drvdata(pdev, data);
78 /* Handle any platform specific setup */
79 if (pdata->ctrl.probe) {
80 err = pdata->ctrl.probe(pdev);
85 /* Scan to find existence of the device */
86 err = nand_scan(&data->chip, pdata->chip.nr_chips);
90 part_types = pdata->chip.part_probe_types;
92 err = mtd_device_parse_register(mtd, part_types, NULL,
93 pdata->chip.partitions,
94 pdata->chip.nr_partitions);
99 nand_release(&data->chip);
101 if (pdata->ctrl.remove)
102 pdata->ctrl.remove(pdev);
107 * Remove a NAND device.
109 static int plat_nand_remove(struct platform_device *pdev)
111 struct plat_nand_data *data = platform_get_drvdata(pdev);
112 struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
114 nand_release(&data->chip);
115 if (pdata->ctrl.remove)
116 pdata->ctrl.remove(pdev);
121 static const struct of_device_id plat_nand_match[] = {
122 { .compatible = "gen_nand" },
125 MODULE_DEVICE_TABLE(of, plat_nand_match);
127 static struct platform_driver plat_nand_driver = {
128 .probe = plat_nand_probe,
129 .remove = plat_nand_remove,
132 .of_match_table = plat_nand_match,
136 module_platform_driver(plat_nand_driver);
138 MODULE_LICENSE("GPL");
139 MODULE_AUTHOR("Vitaly Wool");
140 MODULE_DESCRIPTION("Simple generic NAND driver");
141 MODULE_ALIAS("platform:gen_nand");