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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
25static const char *part_probes[] = { "cmdlinepart", NULL };
26#endif
27
28static 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
50static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
51{
52 struct nand_chip *chip = mtd->priv;
53 void __iomem *io_base = chip->IO_ADDR_R;
54 uint64_t *buf64;
55 int i = 0;
56
57 while (len && (unsigned long)buf & 7) {
58 *buf++ = readb(io_base);
59 len--;
60 }
61 buf64 = (uint64_t *)buf;
62 while (i < len/8) {
63 uint64_t x;
64 asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
65 buf64[i++] = x;
66 }
67 i *= 8;
68 while (i < len)
69 buf[i++] = readb(io_base);
70}
71
72static int __init orion_nand_probe(struct platform_device *pdev)
73{
74 struct mtd_info *mtd;
75 struct nand_chip *nc;
76 struct orion_nand_data *board;
77 void __iomem *io_base;
78 int ret = 0;
79#ifdef CONFIG_MTD_PARTITIONS
80 struct mtd_partition *partitions = NULL;
81 int num_part = 0;
82#endif
83
84 nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
85 if (!nc) {
86 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
87 ret = -ENOMEM;
88 goto no_res;
89 }
90 mtd = (struct mtd_info *)(nc + 1);
91
92 io_base = ioremap(pdev->resource[0].start,
93 pdev->resource[0].end - pdev->resource[0].start + 1);
94 if (!io_base) {
95 printk(KERN_ERR "orion_nand: ioremap failed\n");
96 ret = -EIO;
97 goto no_res;
98 }
99
100 board = pdev->dev.platform_data;
101
102 mtd->priv = nc;
103 mtd->owner = THIS_MODULE;
104
105 nc->priv = board;
106 nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
107 nc->cmd_ctrl = orion_nand_cmd_ctrl;
108 nc->read_buf = orion_nand_read_buf;
109 nc->ecc.mode = NAND_ECC_SOFT;
110
111 if (board->chip_delay)
112 nc->chip_delay = board->chip_delay;
113
114 if (board->width == 16)
115 nc->options |= NAND_BUSWIDTH_16;
116
117 platform_set_drvdata(pdev, mtd);
118
119 if (nand_scan(mtd, 1)) {
120 ret = -ENXIO;
121 goto no_dev;
122 }
123
124#ifdef CONFIG_MTD_PARTITIONS
125#ifdef CONFIG_MTD_CMDLINE_PARTS
126 mtd->name = "orion_nand";
127 num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
128#endif
129
130 if (num_part <= 0) {
131 num_part = board->nr_parts;
132 partitions = board->parts;
133 }
134
135 if (partitions && num_part > 0)
136 ret = add_mtd_partitions(mtd, partitions, num_part);
137 else
138 ret = add_mtd_device(mtd);
139#else
140 ret = add_mtd_device(mtd);
141#endif
142
143 if (ret) {
144 nand_release(mtd);
145 goto no_dev;
146 }
147
148 return 0;
149
150no_dev:
151 platform_set_drvdata(pdev, NULL);
152 iounmap(io_base);
153no_res:
154 kfree(nc);
155
156 return ret;
157}
158
159static int __devexit orion_nand_remove(struct platform_device *pdev)
160{
161 struct mtd_info *mtd = platform_get_drvdata(pdev);
162 struct nand_chip *nc = mtd->priv;
163
164 nand_release(mtd);
165
166 iounmap(nc->IO_ADDR_W);
167
168 kfree(nc);
169
170 return 0;
171}
172
173static struct platform_driver orion_nand_driver = {
174 .remove = __devexit_p(orion_nand_remove),
175 .driver = {
176 .name = "orion_nand",
177 .owner = THIS_MODULE,
178 },
179};
180
181static int __init orion_nand_init(void)
182{
183 return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
184}
185
186static void __exit orion_nand_exit(void)
187{
188 platform_driver_unregister(&orion_nand_driver);
189}
190
191module_init(orion_nand_init);
192module_exit(orion_nand_exit);
193
194MODULE_LICENSE("GPL");
195MODULE_AUTHOR("Tzachi Perelstein");
196MODULE_DESCRIPTION("NAND glue for Orion platforms");
197MODULE_ALIAS("platform:orion_nand");
198
