Commit | Line | Data |
---|---|---|
2a1dba29 TP |
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> | |
a09e64fb | 21 | #include <mach/hardware.h> |
6f088f1d | 22 | #include <plat/orion_nand.h> |
2a1dba29 TP |
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 | ||
bfee1a43 NP |
50 | static 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) { | |
a88a2b88 PZ |
63 | /* |
64 | * Since GCC has no proper constraint (PR 43518) | |
65 | * force x variable to r2/r3 registers as ldrd instruction | |
66 | * requires first register to be even. | |
67 | */ | |
68 | register uint64_t x asm ("r2"); | |
69 | ||
94da210a | 70 | asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base)); |
bfee1a43 NP |
71 | buf64[i++] = x; |
72 | } | |
73 | i *= 8; | |
74 | while (i < len) | |
75 | buf[i++] = readb(io_base); | |
76 | } | |
77 | ||
2a1dba29 TP |
78 | static int __init orion_nand_probe(struct platform_device *pdev) |
79 | { | |
80 | struct mtd_info *mtd; | |
81 | struct nand_chip *nc; | |
82 | struct orion_nand_data *board; | |
83 | void __iomem *io_base; | |
84 | int ret = 0; | |
85 | #ifdef CONFIG_MTD_PARTITIONS | |
86 | struct mtd_partition *partitions = NULL; | |
87 | int num_part = 0; | |
88 | #endif | |
89 | ||
90 | nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL); | |
91 | if (!nc) { | |
92 | printk(KERN_ERR "orion_nand: failed to allocate device structure.\n"); | |
93 | ret = -ENOMEM; | |
94 | goto no_res; | |
95 | } | |
96 | mtd = (struct mtd_info *)(nc + 1); | |
97 | ||
98 | io_base = ioremap(pdev->resource[0].start, | |
99 | pdev->resource[0].end - pdev->resource[0].start + 1); | |
100 | if (!io_base) { | |
101 | printk(KERN_ERR "orion_nand: ioremap failed\n"); | |
102 | ret = -EIO; | |
103 | goto no_res; | |
104 | } | |
105 | ||
106 | board = pdev->dev.platform_data; | |
107 | ||
108 | mtd->priv = nc; | |
109 | mtd->owner = THIS_MODULE; | |
110 | ||
111 | nc->priv = board; | |
112 | nc->IO_ADDR_R = nc->IO_ADDR_W = io_base; | |
113 | nc->cmd_ctrl = orion_nand_cmd_ctrl; | |
bfee1a43 | 114 | nc->read_buf = orion_nand_read_buf; |
2a1dba29 TP |
115 | nc->ecc.mode = NAND_ECC_SOFT; |
116 | ||
f4db56ff SB |
117 | if (board->chip_delay) |
118 | nc->chip_delay = board->chip_delay; | |
119 | ||
2a1dba29 TP |
120 | if (board->width == 16) |
121 | nc->options |= NAND_BUSWIDTH_16; | |
122 | ||
123 | platform_set_drvdata(pdev, mtd); | |
124 | ||
125 | if (nand_scan(mtd, 1)) { | |
126 | ret = -ENXIO; | |
127 | goto no_dev; | |
128 | } | |
129 | ||
130 | #ifdef CONFIG_MTD_PARTITIONS | |
131 | #ifdef CONFIG_MTD_CMDLINE_PARTS | |
132 | mtd->name = "orion_nand"; | |
133 | num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0); | |
134 | #endif | |
135 | /* If cmdline partitions have been passed, let them be used */ | |
136 | if (num_part <= 0) { | |
137 | num_part = board->nr_parts; | |
138 | partitions = board->parts; | |
139 | } | |
140 | ||
141 | if (partitions && num_part > 0) | |
142 | ret = add_mtd_partitions(mtd, partitions, num_part); | |
143 | else | |
144 | ret = add_mtd_device(mtd); | |
145 | #else | |
146 | ret = add_mtd_device(mtd); | |
147 | #endif | |
148 | ||
149 | if (ret) { | |
150 | nand_release(mtd); | |
151 | goto no_dev; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | ||
156 | no_dev: | |
157 | platform_set_drvdata(pdev, NULL); | |
158 | iounmap(io_base); | |
159 | no_res: | |
160 | kfree(nc); | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
165 | static int __devexit orion_nand_remove(struct platform_device *pdev) | |
166 | { | |
167 | struct mtd_info *mtd = platform_get_drvdata(pdev); | |
168 | struct nand_chip *nc = mtd->priv; | |
169 | ||
170 | nand_release(mtd); | |
171 | ||
172 | iounmap(nc->IO_ADDR_W); | |
173 | ||
174 | kfree(nc); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static struct platform_driver orion_nand_driver = { | |
bdf602bd | 180 | .remove = __devexit_p(orion_nand_remove), |
2a1dba29 TP |
181 | .driver = { |
182 | .name = "orion_nand", | |
183 | .owner = THIS_MODULE, | |
184 | }, | |
185 | }; | |
186 | ||
187 | static int __init orion_nand_init(void) | |
188 | { | |
f33dabbe | 189 | return platform_driver_probe(&orion_nand_driver, orion_nand_probe); |
2a1dba29 TP |
190 | } |
191 | ||
192 | static void __exit orion_nand_exit(void) | |
193 | { | |
194 | platform_driver_unregister(&orion_nand_driver); | |
195 | } | |
196 | ||
197 | module_init(orion_nand_init); | |
198 | module_exit(orion_nand_exit); | |
199 | ||
200 | MODULE_LICENSE("GPL"); | |
201 | MODULE_AUTHOR("Tzachi Perelstein"); | |
202 | MODULE_DESCRIPTION("NAND glue for Orion platforms"); | |
1ff18422 | 203 | MODULE_ALIAS("platform:orion_nand"); |