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[ARM] Orion NAND: Make asm volatile avoid GCC pushing ldrd out of the loop
[~shefty/rdma-dev.git] / 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 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
72 static 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         /* If cmdline partitions have been passed, let them be used */
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
150 no_dev:
151         platform_set_drvdata(pdev, NULL);
152         iounmap(io_base);
153 no_res:
154         kfree(nc);
155
156         return ret;
157 }
158
159 static 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
173 static struct platform_driver orion_nand_driver = {
174         .probe          = orion_nand_probe,
175         .remove         = __devexit_p(orion_nand_remove),
176         .driver         = {
177                 .name   = "orion_nand",
178                 .owner  = THIS_MODULE,
179         },
180 };
181
182 static int __init orion_nand_init(void)
183 {
184         return platform_driver_register(&orion_nand_driver);
185 }
186
187 static void __exit orion_nand_exit(void)
188 {
189         platform_driver_unregister(&orion_nand_driver);
190 }
191
192 module_init(orion_nand_init);
193 module_exit(orion_nand_exit);
194
195 MODULE_LICENSE("GPL");
196 MODULE_AUTHOR("Tzachi Perelstein");
197 MODULE_DESCRIPTION("NAND glue for Orion platforms");
198 MODULE_ALIAS("platform:orion_nand");