Commit | Line | Data |
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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> | |
a0fabf72 | 16 | #include <linux/of.h> |
2a1dba29 TP |
17 | #include <linux/mtd/mtd.h> |
18 | #include <linux/mtd/nand.h> | |
19 | #include <linux/mtd/partitions.h> | |
9c2bd504 AL |
20 | #include <linux/clk.h> |
21 | #include <linux/err.h> | |
2a1dba29 TP |
22 | #include <asm/io.h> |
23 | #include <asm/sizes.h> | |
c02cecb9 | 24 | #include <linux/platform_data/mtd-orion_nand.h> |
2a1dba29 | 25 | |
2a1dba29 TP |
26 | static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) |
27 | { | |
28 | struct nand_chip *nc = mtd->priv; | |
29 | struct orion_nand_data *board = nc->priv; | |
30 | u32 offs; | |
31 | ||
32 | if (cmd == NAND_CMD_NONE) | |
33 | return; | |
34 | ||
35 | if (ctrl & NAND_CLE) | |
36 | offs = (1 << board->cle); | |
37 | else if (ctrl & NAND_ALE) | |
38 | offs = (1 << board->ale); | |
39 | else | |
40 | return; | |
41 | ||
42 | if (nc->options & NAND_BUSWIDTH_16) | |
43 | offs <<= 1; | |
44 | ||
45 | writeb(cmd, nc->IO_ADDR_W + offs); | |
46 | } | |
47 | ||
bfee1a43 NP |
48 | static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) |
49 | { | |
50 | struct nand_chip *chip = mtd->priv; | |
51 | void __iomem *io_base = chip->IO_ADDR_R; | |
52 | uint64_t *buf64; | |
53 | int i = 0; | |
54 | ||
55 | while (len && (unsigned long)buf & 7) { | |
56 | *buf++ = readb(io_base); | |
57 | len--; | |
58 | } | |
59 | buf64 = (uint64_t *)buf; | |
60 | while (i < len/8) { | |
a88a2b88 PZ |
61 | /* |
62 | * Since GCC has no proper constraint (PR 43518) | |
63 | * force x variable to r2/r3 registers as ldrd instruction | |
64 | * requires first register to be even. | |
65 | */ | |
66 | register uint64_t x asm ("r2"); | |
67 | ||
94da210a | 68 | asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base)); |
bfee1a43 NP |
69 | buf64[i++] = x; |
70 | } | |
71 | i *= 8; | |
72 | while (i < len) | |
73 | buf[i++] = readb(io_base); | |
74 | } | |
75 | ||
2a1dba29 TP |
76 | static int __init orion_nand_probe(struct platform_device *pdev) |
77 | { | |
78 | struct mtd_info *mtd; | |
a0fabf72 | 79 | struct mtd_part_parser_data ppdata = {}; |
2a1dba29 TP |
80 | struct nand_chip *nc; |
81 | struct orion_nand_data *board; | |
e9903060 | 82 | struct resource *res; |
9c2bd504 | 83 | struct clk *clk; |
2a1dba29 TP |
84 | void __iomem *io_base; |
85 | int ret = 0; | |
a0fabf72 | 86 | u32 val = 0; |
2a1dba29 TP |
87 | |
88 | nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL); | |
89 | if (!nc) { | |
90 | printk(KERN_ERR "orion_nand: failed to allocate device structure.\n"); | |
91 | ret = -ENOMEM; | |
92 | goto no_res; | |
93 | } | |
94 | mtd = (struct mtd_info *)(nc + 1); | |
95 | ||
e9903060 HS |
96 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
97 | if (!res) { | |
2d6bfc26 | 98 | ret = -ENODEV; |
e9903060 HS |
99 | goto no_res; |
100 | } | |
101 | ||
102 | io_base = ioremap(res->start, resource_size(res)); | |
2a1dba29 TP |
103 | if (!io_base) { |
104 | printk(KERN_ERR "orion_nand: ioremap failed\n"); | |
105 | ret = -EIO; | |
106 | goto no_res; | |
107 | } | |
108 | ||
a0fabf72 JL |
109 | if (pdev->dev.of_node) { |
110 | board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data), | |
111 | GFP_KERNEL); | |
112 | if (!board) { | |
113 | printk(KERN_ERR "orion_nand: failed to allocate board structure.\n"); | |
114 | ret = -ENOMEM; | |
115 | goto no_res; | |
116 | } | |
117 | if (!of_property_read_u32(pdev->dev.of_node, "cle", &val)) | |
118 | board->cle = (u8)val; | |
119 | else | |
120 | board->cle = 0; | |
121 | if (!of_property_read_u32(pdev->dev.of_node, "ale", &val)) | |
122 | board->ale = (u8)val; | |
123 | else | |
124 | board->ale = 1; | |
125 | if (!of_property_read_u32(pdev->dev.of_node, | |
126 | "bank-width", &val)) | |
127 | board->width = (u8)val * 8; | |
128 | else | |
129 | board->width = 8; | |
130 | if (!of_property_read_u32(pdev->dev.of_node, | |
131 | "chip-delay", &val)) | |
132 | board->chip_delay = (u8)val; | |
133 | } else | |
134 | board = pdev->dev.platform_data; | |
2a1dba29 TP |
135 | |
136 | mtd->priv = nc; | |
137 | mtd->owner = THIS_MODULE; | |
138 | ||
139 | nc->priv = board; | |
140 | nc->IO_ADDR_R = nc->IO_ADDR_W = io_base; | |
141 | nc->cmd_ctrl = orion_nand_cmd_ctrl; | |
bfee1a43 | 142 | nc->read_buf = orion_nand_read_buf; |
2a1dba29 TP |
143 | nc->ecc.mode = NAND_ECC_SOFT; |
144 | ||
f4db56ff SB |
145 | if (board->chip_delay) |
146 | nc->chip_delay = board->chip_delay; | |
147 | ||
a0fabf72 JL |
148 | WARN(board->width > 16, |
149 | "%d bit bus width out of range", | |
150 | board->width); | |
151 | ||
2a1dba29 TP |
152 | if (board->width == 16) |
153 | nc->options |= NAND_BUSWIDTH_16; | |
154 | ||
eedfea25 BD |
155 | if (board->dev_ready) |
156 | nc->dev_ready = board->dev_ready; | |
157 | ||
2a1dba29 TP |
158 | platform_set_drvdata(pdev, mtd); |
159 | ||
9c2bd504 AL |
160 | /* Not all platforms can gate the clock, so it is not |
161 | an error if the clock does not exists. */ | |
162 | clk = clk_get(&pdev->dev, NULL); | |
163 | if (!IS_ERR(clk)) { | |
164 | clk_prepare_enable(clk); | |
165 | clk_put(clk); | |
166 | } | |
167 | ||
2a1dba29 TP |
168 | if (nand_scan(mtd, 1)) { |
169 | ret = -ENXIO; | |
170 | goto no_dev; | |
171 | } | |
172 | ||
2a1dba29 | 173 | mtd->name = "orion_nand"; |
a0fabf72 JL |
174 | ppdata.of_node = pdev->dev.of_node; |
175 | ret = mtd_device_parse_register(mtd, NULL, &ppdata, | |
176 | board->parts, board->nr_parts); | |
2a1dba29 TP |
177 | if (ret) { |
178 | nand_release(mtd); | |
179 | goto no_dev; | |
180 | } | |
181 | ||
182 | return 0; | |
183 | ||
184 | no_dev: | |
baffab28 SB |
185 | if (!IS_ERR(clk)) { |
186 | clk_disable_unprepare(clk); | |
187 | clk_put(clk); | |
188 | } | |
2a1dba29 TP |
189 | platform_set_drvdata(pdev, NULL); |
190 | iounmap(io_base); | |
191 | no_res: | |
192 | kfree(nc); | |
193 | ||
194 | return ret; | |
195 | } | |
196 | ||
197 | static int __devexit orion_nand_remove(struct platform_device *pdev) | |
198 | { | |
199 | struct mtd_info *mtd = platform_get_drvdata(pdev); | |
200 | struct nand_chip *nc = mtd->priv; | |
9c2bd504 | 201 | struct clk *clk; |
2a1dba29 TP |
202 | |
203 | nand_release(mtd); | |
204 | ||
205 | iounmap(nc->IO_ADDR_W); | |
206 | ||
207 | kfree(nc); | |
208 | ||
9c2bd504 AL |
209 | clk = clk_get(&pdev->dev, NULL); |
210 | if (!IS_ERR(clk)) { | |
211 | clk_disable_unprepare(clk); | |
212 | clk_put(clk); | |
213 | } | |
214 | ||
2a1dba29 TP |
215 | return 0; |
216 | } | |
217 | ||
a0fabf72 JL |
218 | #ifdef CONFIG_OF |
219 | static struct of_device_id orion_nand_of_match_table[] = { | |
77843504 | 220 | { .compatible = "marvell,orion-nand", }, |
a0fabf72 JL |
221 | {}, |
222 | }; | |
223 | #endif | |
224 | ||
2a1dba29 | 225 | static struct platform_driver orion_nand_driver = { |
bdf602bd | 226 | .remove = __devexit_p(orion_nand_remove), |
2a1dba29 TP |
227 | .driver = { |
228 | .name = "orion_nand", | |
229 | .owner = THIS_MODULE, | |
a0fabf72 | 230 | .of_match_table = of_match_ptr(orion_nand_of_match_table), |
2a1dba29 TP |
231 | }, |
232 | }; | |
233 | ||
234 | static int __init orion_nand_init(void) | |
235 | { | |
f33dabbe | 236 | return platform_driver_probe(&orion_nand_driver, orion_nand_probe); |
2a1dba29 TP |
237 | } |
238 | ||
239 | static void __exit orion_nand_exit(void) | |
240 | { | |
241 | platform_driver_unregister(&orion_nand_driver); | |
242 | } | |
243 | ||
244 | module_init(orion_nand_init); | |
245 | module_exit(orion_nand_exit); | |
246 | ||
247 | MODULE_LICENSE("GPL"); | |
248 | MODULE_AUTHOR("Tzachi Perelstein"); | |
249 | MODULE_DESCRIPTION("NAND glue for Orion platforms"); | |
1ff18422 | 250 | MODULE_ALIAS("platform:orion_nand"); |