Merge branch 'topic/ctxfi' into for-linus
[linux-2.6] / drivers / mtd / nand / orion_nand.c
1 /*
2  * drivers/mtd/nand/orion_nand.c
3  *
4  * NAND support for Marvell Orion SoC platforms
5  *
6  * Tzachi Perelstein <tzachi@marvell.com>
7  *
8  * This file is licensed under  the terms of the GNU General Public
9  * License version 2. This program is licensed "as is" without any
10  * warranty of any kind, whether express or implied.
11  */
12
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/nand.h>
18 #include <linux/mtd/partitions.h>
19 #include <asm/io.h>
20 #include <asm/sizes.h>
21 #include <mach/hardware.h>
22 #include <plat/orion_nand.h>
23
24 #ifdef CONFIG_MTD_CMDLINE_PARTS
25 static const char *part_probes[] = { "cmdlinepart", NULL };
26 #endif
27
28 static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
29 {
30         struct nand_chip *nc = mtd->priv;
31         struct orion_nand_data *board = nc->priv;
32         u32 offs;
33
34         if (cmd == NAND_CMD_NONE)
35                 return;
36
37         if (ctrl & NAND_CLE)
38                 offs = (1 << board->cle);
39         else if (ctrl & NAND_ALE)
40                 offs = (1 << board->ale);
41         else
42                 return;
43
44         if (nc->options & NAND_BUSWIDTH_16)
45                 offs <<= 1;
46
47         writeb(cmd, nc->IO_ADDR_W + offs);
48 }
49
50 static int __init orion_nand_probe(struct platform_device *pdev)
51 {
52         struct mtd_info *mtd;
53         struct nand_chip *nc;
54         struct orion_nand_data *board;
55         void __iomem *io_base;
56         int ret = 0;
57 #ifdef CONFIG_MTD_PARTITIONS
58         struct mtd_partition *partitions = NULL;
59         int num_part = 0;
60 #endif
61
62         nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
63         if (!nc) {
64                 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
65                 ret = -ENOMEM;
66                 goto no_res;
67         }
68         mtd = (struct mtd_info *)(nc + 1);
69
70         io_base = ioremap(pdev->resource[0].start,
71                         pdev->resource[0].end - pdev->resource[0].start + 1);
72         if (!io_base) {
73                 printk(KERN_ERR "orion_nand: ioremap failed\n");
74                 ret = -EIO;
75                 goto no_res;
76         }
77
78         board = pdev->dev.platform_data;
79
80         mtd->priv = nc;
81         mtd->owner = THIS_MODULE;
82
83         nc->priv = board;
84         nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
85         nc->cmd_ctrl = orion_nand_cmd_ctrl;
86         nc->ecc.mode = NAND_ECC_SOFT;
87
88         if (board->chip_delay)
89                 nc->chip_delay = board->chip_delay;
90
91         if (board->width == 16)
92                 nc->options |= NAND_BUSWIDTH_16;
93
94         platform_set_drvdata(pdev, mtd);
95
96         if (nand_scan(mtd, 1)) {
97                 ret = -ENXIO;
98                 goto no_dev;
99         }
100
101 #ifdef CONFIG_MTD_PARTITIONS
102 #ifdef CONFIG_MTD_CMDLINE_PARTS
103         mtd->name = "orion_nand";
104         num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
105 #endif
106         /* If cmdline partitions have been passed, let them be used */
107         if (num_part <= 0) {
108                 num_part = board->nr_parts;
109                 partitions = board->parts;
110         }
111
112         if (partitions && num_part > 0)
113                 ret = add_mtd_partitions(mtd, partitions, num_part);
114         else
115                 ret = add_mtd_device(mtd);
116 #else
117         ret = add_mtd_device(mtd);
118 #endif
119
120         if (ret) {
121                 nand_release(mtd);
122                 goto no_dev;
123         }
124
125         return 0;
126
127 no_dev:
128         platform_set_drvdata(pdev, NULL);
129         iounmap(io_base);
130 no_res:
131         kfree(nc);
132
133         return ret;
134 }
135
136 static int __devexit orion_nand_remove(struct platform_device *pdev)
137 {
138         struct mtd_info *mtd = platform_get_drvdata(pdev);
139         struct nand_chip *nc = mtd->priv;
140
141         nand_release(mtd);
142
143         iounmap(nc->IO_ADDR_W);
144
145         kfree(nc);
146
147         return 0;
148 }
149
150 static struct platform_driver orion_nand_driver = {
151         .probe          = orion_nand_probe,
152         .remove         = __devexit_p(orion_nand_remove),
153         .driver         = {
154                 .name   = "orion_nand",
155                 .owner  = THIS_MODULE,
156         },
157 };
158
159 static int __init orion_nand_init(void)
160 {
161         return platform_driver_register(&orion_nand_driver);
162 }
163
164 static void __exit orion_nand_exit(void)
165 {
166         platform_driver_unregister(&orion_nand_driver);
167 }
168
169 module_init(orion_nand_init);
170 module_exit(orion_nand_exit);
171
172 MODULE_LICENSE("GPL");
173 MODULE_AUTHOR("Tzachi Perelstein");
174 MODULE_DESCRIPTION("NAND glue for Orion platforms");
175 MODULE_ALIAS("platform:orion_nand");