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