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 */
plat_nand_probe(struct platform_device * pdev)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 */
plat_nand_remove(struct platform_device * pdev)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