xref: /openbmc/linux/drivers/mtd/nand/raw/plat_nand.c (revision da2ef666)
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/rawnand.h>
19 #include <linux/mtd/partitions.h>
20 
21 struct plat_nand_data {
22 	struct nand_chip	chip;
23 	void __iomem		*io_base;
24 };
25 
26 /*
27  * Probe for the NAND device.
28  */
29 static int plat_nand_probe(struct platform_device *pdev)
30 {
31 	struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
32 	struct plat_nand_data *data;
33 	struct mtd_info *mtd;
34 	struct resource *res;
35 	const char **part_types;
36 	int err = 0;
37 
38 	if (!pdata) {
39 		dev_err(&pdev->dev, "platform_nand_data is missing\n");
40 		return -EINVAL;
41 	}
42 
43 	if (pdata->chip.nr_chips < 1) {
44 		dev_err(&pdev->dev, "invalid number of chips specified\n");
45 		return -EINVAL;
46 	}
47 
48 	/* Allocate memory for the device structure (and zero it) */
49 	data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
50 			    GFP_KERNEL);
51 	if (!data)
52 		return -ENOMEM;
53 
54 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
55 	data->io_base = devm_ioremap_resource(&pdev->dev, res);
56 	if (IS_ERR(data->io_base))
57 		return PTR_ERR(data->io_base);
58 
59 	nand_set_flash_node(&data->chip, pdev->dev.of_node);
60 	mtd = nand_to_mtd(&data->chip);
61 	mtd->dev.parent = &pdev->dev;
62 
63 	data->chip.IO_ADDR_R = data->io_base;
64 	data->chip.IO_ADDR_W = data->io_base;
65 	data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
66 	data->chip.dev_ready = pdata->ctrl.dev_ready;
67 	data->chip.select_chip = pdata->ctrl.select_chip;
68 	data->chip.write_buf = pdata->ctrl.write_buf;
69 	data->chip.read_buf = pdata->ctrl.read_buf;
70 	data->chip.chip_delay = pdata->chip.chip_delay;
71 	data->chip.options |= pdata->chip.options;
72 	data->chip.bbt_options |= pdata->chip.bbt_options;
73 
74 	data->chip.ecc.mode = NAND_ECC_SOFT;
75 	data->chip.ecc.algo = NAND_ECC_HAMMING;
76 
77 	platform_set_drvdata(pdev, data);
78 
79 	/* Handle any platform specific setup */
80 	if (pdata->ctrl.probe) {
81 		err = pdata->ctrl.probe(pdev);
82 		if (err)
83 			goto out;
84 	}
85 
86 	/* Scan to find existence of the device */
87 	err = nand_scan(mtd, pdata->chip.nr_chips);
88 	if (err)
89 		goto out;
90 
91 	part_types = pdata->chip.part_probe_types;
92 
93 	err = mtd_device_parse_register(mtd, part_types, NULL,
94 					pdata->chip.partitions,
95 					pdata->chip.nr_partitions);
96 
97 	if (!err)
98 		return err;
99 
100 	nand_release(mtd);
101 out:
102 	if (pdata->ctrl.remove)
103 		pdata->ctrl.remove(pdev);
104 	return err;
105 }
106 
107 /*
108  * Remove a NAND device.
109  */
110 static int plat_nand_remove(struct platform_device *pdev)
111 {
112 	struct plat_nand_data *data = platform_get_drvdata(pdev);
113 	struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
114 
115 	nand_release(nand_to_mtd(&data->chip));
116 	if (pdata->ctrl.remove)
117 		pdata->ctrl.remove(pdev);
118 
119 	return 0;
120 }
121 
122 static const struct of_device_id plat_nand_match[] = {
123 	{ .compatible = "gen_nand" },
124 	{},
125 };
126 MODULE_DEVICE_TABLE(of, plat_nand_match);
127 
128 static struct platform_driver plat_nand_driver = {
129 	.probe	= plat_nand_probe,
130 	.remove	= plat_nand_remove,
131 	.driver	= {
132 		.name		= "gen_nand",
133 		.of_match_table = plat_nand_match,
134 	},
135 };
136 
137 module_platform_driver(plat_nand_driver);
138 
139 MODULE_LICENSE("GPL");
140 MODULE_AUTHOR("Vitaly Wool");
141 MODULE_DESCRIPTION("Simple generic NAND driver");
142 MODULE_ALIAS("platform:gen_nand");
143