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	struct mtd_info		mtd;
24	void __iomem		*io_base;
25};
26
27/*
28 * Probe for the NAND device.
29 */
30static 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);
106out:
107	if (pdata->ctrl.remove)
108		pdata->ctrl.remove(pdev);
109	return err;
110}
111
112/*
113 * Remove a NAND device.
114 */
115static 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
127static const struct of_device_id plat_nand_match[] = {
128	{ .compatible = "gen_nand" },
129	{},
130};
131MODULE_DEVICE_TABLE(of, plat_nand_match);
132
133static 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
142module_platform_driver(plat_nand_driver);
143
144MODULE_LICENSE("GPL");
145MODULE_AUTHOR("Vitaly Wool");
146MODULE_DESCRIPTION("Simple generic NAND driver");
147MODULE_ALIAS("platform:gen_nand");
148