Merge remote branch 'tip/x86/tsc' into fortglx/2.6.38/tip/x86/tsc
[pandora-kernel.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 #ifdef CONFIG_MTD_PARTITIONS
25         int                     nr_parts;
26         struct mtd_partition    *parts;
27 #endif
28 };
29
30 /*
31  * Probe for the NAND device.
32  */
33 static int __devinit plat_nand_probe(struct platform_device *pdev)
34 {
35         struct platform_nand_data *pdata = pdev->dev.platform_data;
36         struct plat_nand_data *data;
37         struct resource *res;
38         int err = 0;
39
40         if (pdata->chip.nr_chips < 1) {
41                 dev_err(&pdev->dev, "invalid number of chips specified\n");
42                 return -EINVAL;
43         }
44
45         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
46         if (!res)
47                 return -ENXIO;
48
49         /* Allocate memory for the device structure (and zero it) */
50         data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
51         if (!data) {
52                 dev_err(&pdev->dev, "failed to allocate device structure.\n");
53                 return -ENOMEM;
54         }
55
56         if (!request_mem_region(res->start, resource_size(res),
57                                 dev_name(&pdev->dev))) {
58                 dev_err(&pdev->dev, "request_mem_region failed\n");
59                 err = -EBUSY;
60                 goto out_free;
61         }
62
63         data->io_base = ioremap(res->start, resource_size(res));
64         if (data->io_base == NULL) {
65                 dev_err(&pdev->dev, "ioremap failed\n");
66                 err = -EIO;
67                 goto out_release_io;
68         }
69
70         data->chip.priv = &data;
71         data->mtd.priv = &data->chip;
72         data->mtd.owner = THIS_MODULE;
73         data->mtd.name = dev_name(&pdev->dev);
74
75         data->chip.IO_ADDR_R = data->io_base;
76         data->chip.IO_ADDR_W = data->io_base;
77         data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
78         data->chip.dev_ready = pdata->ctrl.dev_ready;
79         data->chip.select_chip = pdata->ctrl.select_chip;
80         data->chip.write_buf = pdata->ctrl.write_buf;
81         data->chip.read_buf = pdata->ctrl.read_buf;
82         data->chip.chip_delay = pdata->chip.chip_delay;
83         data->chip.options |= pdata->chip.options;
84
85         data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
86         data->chip.ecc.layout = pdata->chip.ecclayout;
87         data->chip.ecc.mode = NAND_ECC_SOFT;
88
89         platform_set_drvdata(pdev, data);
90
91         /* Handle any platform specific setup */
92         if (pdata->ctrl.probe) {
93                 err = pdata->ctrl.probe(pdev);
94                 if (err)
95                         goto out;
96         }
97
98         /* Scan to find existance of the device */
99         if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
100                 err = -ENXIO;
101                 goto out;
102         }
103
104 #ifdef CONFIG_MTD_PARTITIONS
105         if (pdata->chip.part_probe_types) {
106                 err = parse_mtd_partitions(&data->mtd,
107                                         pdata->chip.part_probe_types,
108                                         &data->parts, 0);
109                 if (err > 0) {
110                         add_mtd_partitions(&data->mtd, data->parts, err);
111                         return 0;
112                 }
113         }
114         if (pdata->chip.set_parts)
115                 pdata->chip.set_parts(data->mtd.size, &pdata->chip);
116         if (pdata->chip.partitions) {
117                 data->parts = pdata->chip.partitions;
118                 err = add_mtd_partitions(&data->mtd, data->parts,
119                         pdata->chip.nr_partitions);
120         } else
121 #endif
122         err = add_mtd_device(&data->mtd);
123
124         if (!err)
125                 return err;
126
127         nand_release(&data->mtd);
128 out:
129         if (pdata->ctrl.remove)
130                 pdata->ctrl.remove(pdev);
131         platform_set_drvdata(pdev, NULL);
132         iounmap(data->io_base);
133 out_release_io:
134         release_mem_region(res->start, resource_size(res));
135 out_free:
136         kfree(data);
137         return err;
138 }
139
140 /*
141  * Remove a NAND device.
142  */
143 static int __devexit plat_nand_remove(struct platform_device *pdev)
144 {
145         struct plat_nand_data *data = platform_get_drvdata(pdev);
146         struct platform_nand_data *pdata = pdev->dev.platform_data;
147         struct resource *res;
148
149         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150
151         nand_release(&data->mtd);
152 #ifdef CONFIG_MTD_PARTITIONS
153         if (data->parts && data->parts != pdata->chip.partitions)
154                 kfree(data->parts);
155 #endif
156         if (pdata->ctrl.remove)
157                 pdata->ctrl.remove(pdev);
158         iounmap(data->io_base);
159         release_mem_region(res->start, resource_size(res));
160         kfree(data);
161
162         return 0;
163 }
164
165 static struct platform_driver plat_nand_driver = {
166         .probe          = plat_nand_probe,
167         .remove         = __devexit_p(plat_nand_remove),
168         .driver         = {
169                 .name   = "gen_nand",
170                 .owner  = THIS_MODULE,
171         },
172 };
173
174 static int __init plat_nand_init(void)
175 {
176         return platform_driver_register(&plat_nand_driver);
177 }
178
179 static void __exit plat_nand_exit(void)
180 {
181         platform_driver_unregister(&plat_nand_driver);
182 }
183
184 module_init(plat_nand_init);
185 module_exit(plat_nand_exit);
186
187 MODULE_LICENSE("GPL");
188 MODULE_AUTHOR("Vitaly Wool");
189 MODULE_DESCRIPTION("Simple generic NAND driver");
190 MODULE_ALIAS("platform:gen_nand");