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
orion_nand_cmd_ctrl(struct mtd_info * mtd,int cmd,unsigned int ctrl)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
orion_nand_probe(struct platform_device * pdev)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
orion_nand_remove(struct platform_device * pdev)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
orion_nand_init(void)159 static int __init orion_nand_init(void)
160 {
161 return platform_driver_register(&orion_nand_driver);
162 }
163
orion_nand_exit(void)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");
176