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/io.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/nand.h>
18 #include <linux/mtd/partitions.h>
19
20 struct plat_nand_data {
21 struct nand_chip chip;
22 struct mtd_info mtd;
23 void __iomem *io_base;
24 };
25
26 static const char *part_probe_types[] = { "cmdlinepart", NULL };
27
28 /*
29 * Probe for the NAND device.
30 */
plat_nand_probe(struct platform_device * pdev)31 static int plat_nand_probe(struct platform_device *pdev)
32 {
33 struct platform_nand_data *pdata = pdev->dev.platform_data;
34 struct mtd_part_parser_data ppdata;
35 struct plat_nand_data *data;
36 struct resource *res;
37 const char **part_types;
38 int err = 0;
39
40 if (!pdata) {
41 dev_err(&pdev->dev, "platform_nand_data is missing\n");
42 return -EINVAL;
43 }
44
45 if (pdata->chip.nr_chips < 1) {
46 dev_err(&pdev->dev, "invalid number of chips specified\n");
47 return -EINVAL;
48 }
49
50 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
51 if (!res)
52 return -ENXIO;
53
54 /* Allocate memory for the device structure (and zero it) */
55 data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
56 if (!data) {
57 dev_err(&pdev->dev, "failed to allocate device structure.\n");
58 return -ENOMEM;
59 }
60
61 if (!request_mem_region(res->start, resource_size(res),
62 dev_name(&pdev->dev))) {
63 dev_err(&pdev->dev, "request_mem_region failed\n");
64 err = -EBUSY;
65 goto out_free;
66 }
67
68 data->io_base = ioremap(res->start, resource_size(res));
69 if (data->io_base == NULL) {
70 dev_err(&pdev->dev, "ioremap failed\n");
71 err = -EIO;
72 goto out_release_io;
73 }
74
75 data->chip.priv = &data;
76 data->mtd.priv = &data->chip;
77 data->mtd.owner = THIS_MODULE;
78 data->mtd.name = dev_name(&pdev->dev);
79
80 data->chip.IO_ADDR_R = data->io_base;
81 data->chip.IO_ADDR_W = data->io_base;
82 data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
83 data->chip.dev_ready = pdata->ctrl.dev_ready;
84 data->chip.select_chip = pdata->ctrl.select_chip;
85 data->chip.write_buf = pdata->ctrl.write_buf;
86 data->chip.read_buf = pdata->ctrl.read_buf;
87 data->chip.read_byte = pdata->ctrl.read_byte;
88 data->chip.chip_delay = pdata->chip.chip_delay;
89 data->chip.options |= pdata->chip.options;
90 data->chip.bbt_options |= pdata->chip.bbt_options;
91
92 data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
93 data->chip.ecc.layout = pdata->chip.ecclayout;
94 data->chip.ecc.mode = NAND_ECC_SOFT;
95
96 platform_set_drvdata(pdev, data);
97
98 /* Handle any platform specific setup */
99 if (pdata->ctrl.probe) {
100 err = pdata->ctrl.probe(pdev);
101 if (err)
102 goto out;
103 }
104
105 /* Scan to find existence of the device */
106 if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
107 err = -ENXIO;
108 goto out;
109 }
110
111 part_types = pdata->chip.part_probe_types ? : part_probe_types;
112
113 ppdata.of_node = pdev->dev.of_node;
114 err = mtd_device_parse_register(&data->mtd, part_types, &ppdata,
115 pdata->chip.partitions,
116 pdata->chip.nr_partitions);
117
118 if (!err)
119 return err;
120
121 nand_release(&data->mtd);
122 out:
123 if (pdata->ctrl.remove)
124 pdata->ctrl.remove(pdev);
125 platform_set_drvdata(pdev, NULL);
126 iounmap(data->io_base);
127 out_release_io:
128 release_mem_region(res->start, resource_size(res));
129 out_free:
130 kfree(data);
131 return err;
132 }
133
134 /*
135 * Remove a NAND device.
136 */
plat_nand_remove(struct platform_device * pdev)137 static int plat_nand_remove(struct platform_device *pdev)
138 {
139 struct plat_nand_data *data = platform_get_drvdata(pdev);
140 struct platform_nand_data *pdata = pdev->dev.platform_data;
141 struct resource *res;
142
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144
145 nand_release(&data->mtd);
146 if (pdata->ctrl.remove)
147 pdata->ctrl.remove(pdev);
148 iounmap(data->io_base);
149 release_mem_region(res->start, resource_size(res));
150 kfree(data);
151
152 return 0;
153 }
154
155 static const struct of_device_id plat_nand_match[] = {
156 { .compatible = "gen_nand" },
157 {},
158 };
159 MODULE_DEVICE_TABLE(of, plat_nand_match);
160
161 static struct platform_driver plat_nand_driver = {
162 .probe = plat_nand_probe,
163 .remove = plat_nand_remove,
164 .driver = {
165 .name = "gen_nand",
166 .owner = THIS_MODULE,
167 .of_match_table = plat_nand_match,
168 },
169 };
170
171 module_platform_driver(plat_nand_driver);
172
173 MODULE_LICENSE("GPL");
174 MODULE_AUTHOR("Vitaly Wool");
175 MODULE_DESCRIPTION("Simple generic NAND driver");
176 MODULE_ALIAS("platform:gen_nand");
177