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mtd: ppchameleonevb: convert to mtd_device_register()
[karo-tx-linux.git] / drivers / mtd / nand / plat_nand.c
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         int                     nr_parts;
25         struct mtd_partition    *parts;
26 };
27
28 /*
29  * Probe for the NAND device.
30  */
31 static int __devinit plat_nand_probe(struct platform_device *pdev)
32 {
33         struct platform_nand_data *pdata = pdev->dev.platform_data;
34         struct plat_nand_data *data;
35         struct resource *res;
36         int err = 0;
37
38         if (pdata->chip.nr_chips < 1) {
39                 dev_err(&pdev->dev, "invalid number of chips specified\n");
40                 return -EINVAL;
41         }
42
43         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
44         if (!res)
45                 return -ENXIO;
46
47         /* Allocate memory for the device structure (and zero it) */
48         data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
49         if (!data) {
50                 dev_err(&pdev->dev, "failed to allocate device structure.\n");
51                 return -ENOMEM;
52         }
53
54         if (!request_mem_region(res->start, resource_size(res),
55                                 dev_name(&pdev->dev))) {
56                 dev_err(&pdev->dev, "request_mem_region failed\n");
57                 err = -EBUSY;
58                 goto out_free;
59         }
60
61         data->io_base = ioremap(res->start, resource_size(res));
62         if (data->io_base == NULL) {
63                 dev_err(&pdev->dev, "ioremap failed\n");
64                 err = -EIO;
65                 goto out_release_io;
66         }
67
68         data->chip.priv = &data;
69         data->mtd.priv = &data->chip;
70         data->mtd.owner = THIS_MODULE;
71         data->mtd.name = dev_name(&pdev->dev);
72
73         data->chip.IO_ADDR_R = data->io_base;
74         data->chip.IO_ADDR_W = data->io_base;
75         data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
76         data->chip.dev_ready = pdata->ctrl.dev_ready;
77         data->chip.select_chip = pdata->ctrl.select_chip;
78         data->chip.write_buf = pdata->ctrl.write_buf;
79         data->chip.read_buf = pdata->ctrl.read_buf;
80         data->chip.chip_delay = pdata->chip.chip_delay;
81         data->chip.options |= pdata->chip.options;
82
83         data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
84         data->chip.ecc.layout = pdata->chip.ecclayout;
85         data->chip.ecc.mode = NAND_ECC_SOFT;
86
87         platform_set_drvdata(pdev, data);
88
89         /* Handle any platform specific setup */
90         if (pdata->ctrl.probe) {
91                 err = pdata->ctrl.probe(pdev);
92                 if (err)
93                         goto out;
94         }
95
96         /* Scan to find existence of the device */
97         if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
98                 err = -ENXIO;
99                 goto out;
100         }
101
102         if (pdata->chip.part_probe_types) {
103                 err = parse_mtd_partitions(&data->mtd,
104                                         pdata->chip.part_probe_types,
105                                         &data->parts, 0);
106                 if (err > 0) {
107                         mtd_device_register(&data->mtd, data->parts, err);
108                         return 0;
109                 }
110         }
111         if (pdata->chip.set_parts)
112                 pdata->chip.set_parts(data->mtd.size, &pdata->chip);
113         if (pdata->chip.partitions) {
114                 data->parts = pdata->chip.partitions;
115                 err = mtd_device_register(&data->mtd, data->parts,
116                         pdata->chip.nr_partitions);
117         } else
118                 err = mtd_device_register(&data->mtd, NULL, 0);
119
120         if (!err)
121                 return err;
122
123         nand_release(&data->mtd);
124 out:
125         if (pdata->ctrl.remove)
126                 pdata->ctrl.remove(pdev);
127         platform_set_drvdata(pdev, NULL);
128         iounmap(data->io_base);
129 out_release_io:
130         release_mem_region(res->start, resource_size(res));
131 out_free:
132         kfree(data);
133         return err;
134 }
135
136 /*
137  * Remove a NAND device.
138  */
139 static int __devexit plat_nand_remove(struct platform_device *pdev)
140 {
141         struct plat_nand_data *data = platform_get_drvdata(pdev);
142         struct platform_nand_data *pdata = pdev->dev.platform_data;
143         struct resource *res;
144
145         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
146
147         nand_release(&data->mtd);
148         if (data->parts && data->parts != pdata->chip.partitions)
149                 kfree(data->parts);
150         if (pdata->ctrl.remove)
151                 pdata->ctrl.remove(pdev);
152         iounmap(data->io_base);
153         release_mem_region(res->start, resource_size(res));
154         kfree(data);
155
156         return 0;
157 }
158
159 static struct platform_driver plat_nand_driver = {
160         .probe          = plat_nand_probe,
161         .remove         = __devexit_p(plat_nand_remove),
162         .driver         = {
163                 .name   = "gen_nand",
164                 .owner  = THIS_MODULE,
165         },
166 };
167
168 static int __init plat_nand_init(void)
169 {
170         return platform_driver_register(&plat_nand_driver);
171 }
172
173 static void __exit plat_nand_exit(void)
174 {
175         platform_driver_unregister(&plat_nand_driver);
176 }
177
178 module_init(plat_nand_init);
179 module_exit(plat_nand_exit);
180
181 MODULE_LICENSE("GPL");
182 MODULE_AUTHOR("Vitaly Wool");
183 MODULE_DESCRIPTION("Simple generic NAND driver");
184 MODULE_ALIAS("platform:gen_nand");