tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
24static const char *part_probes[] = { "cmdlinepart", NULL };
25
26static 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
48static 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) {
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
68 asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
69 buf64[i++] = x;
70 }
71 i *= 8;
72 while (i < len)
73 buf[i++] = readb(io_base);
74}
75
76static int __init orion_nand_probe(struct platform_device *pdev)
77{
78 struct mtd_info *mtd;
79 struct nand_chip *nc;
80 struct orion_nand_data *board;
81 struct resource *res;
82 void __iomem *io_base;
83 int ret = 0;
84 struct mtd_partition *partitions = NULL;
85 int num_part = 0;
86
87 nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
88 if (!nc) {
89 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
90 ret = -ENOMEM;
91 goto no_res;
92 }
93 mtd = (struct mtd_info *)(nc + 1);
94
95 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
96 if (!res) {
97 ret = -ENODEV;
98 goto no_res;
99 }
100
101 io_base = ioremap(res->start, resource_size(res));
102 if (!io_base) {
103 printk(KERN_ERR "orion_nand: ioremap failed\n");
104 ret = -EIO;
105 goto no_res;
106 }
107
108 board = pdev->dev.platform_data;
109
110 mtd->priv = nc;
111 mtd->owner = THIS_MODULE;
112
113 nc->priv = board;
114 nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
115 nc->cmd_ctrl = orion_nand_cmd_ctrl;
116 nc->read_buf = orion_nand_read_buf;
117 nc->ecc.mode = NAND_ECC_SOFT;
118
119 if (board->chip_delay)
120 nc->chip_delay = board->chip_delay;
121
122 if (board->width == 16)
123 nc->options |= NAND_BUSWIDTH_16;
124
125 if (board->dev_ready)
126 nc->dev_ready = board->dev_ready;
127
128 platform_set_drvdata(pdev, mtd);
129
130 if (nand_scan(mtd, 1)) {
131 ret = -ENXIO;
132 goto no_dev;
133 }
134
135#ifdef CONFIG_MTD_CMDLINE_PARTS
136 mtd->name = "orion_nand";
137 num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
138#endif
139 /* If cmdline partitions have been passed, let them be used */
140 if (num_part <= 0) {
141 num_part = board->nr_parts;
142 partitions = board->parts;
143 }
144
145 ret = mtd_device_register(mtd, partitions, num_part);
146 if (ret) {
147 nand_release(mtd);
148 goto no_dev;
149 }
150
151 return 0;
152
153no_dev:
154 platform_set_drvdata(pdev, NULL);
155 iounmap(io_base);
156no_res:
157 kfree(nc);
158
159 return ret;
160}
161
162static int __devexit orion_nand_remove(struct platform_device *pdev)
163{
164 struct mtd_info *mtd = platform_get_drvdata(pdev);
165 struct nand_chip *nc = mtd->priv;
166
167 nand_release(mtd);
168
169 iounmap(nc->IO_ADDR_W);
170
171 kfree(nc);
172
173 return 0;
174}
175
176static struct platform_driver orion_nand_driver = {
177 .remove = __devexit_p(orion_nand_remove),
178 .driver = {
179 .name = "orion_nand",
180 .owner = THIS_MODULE,
181 },
182};
183
184static int __init orion_nand_init(void)
185{
186 return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
187}
188
189static void __exit orion_nand_exit(void)
190{
191 platform_driver_unregister(&orion_nand_driver);
192}
193
194module_init(orion_nand_init);
195module_exit(orion_nand_exit);
196
197MODULE_LICENSE("GPL");
198MODULE_AUTHOR("Tzachi Perelstein");
199MODULE_DESCRIPTION("NAND glue for Orion platforms");
200MODULE_ALIAS("platform:orion_nand");