2 * drivers/mtd/nand/orion_nand.c
4 * NAND support for Marvell Orion SoC platforms
6 * Tzachi Perelstein <tzachi@marvell.com>
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.
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>
20 #include <asm/sizes.h>
21 #include <mach/hardware.h>
22 #include <plat/orion_nand.h>
24 static const char *part_probes[] = { "cmdlinepart", NULL };
26 static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
28 struct nand_chip *nc = mtd->priv;
29 struct orion_nand_data *board = nc->priv;
32 if (cmd == NAND_CMD_NONE)
36 offs = (1 << board->cle);
37 else if (ctrl & NAND_ALE)
38 offs = (1 << board->ale);
42 if (nc->options & NAND_BUSWIDTH_16)
45 writeb(cmd, nc->IO_ADDR_W + offs);
48 static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
50 struct nand_chip *chip = mtd->priv;
51 void __iomem *io_base = chip->IO_ADDR_R;
55 while (len && (unsigned long)buf & 7) {
56 *buf++ = readb(io_base);
59 buf64 = (uint64_t *)buf;
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.
66 register uint64_t x asm ("r2");
68 asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
73 buf[i++] = readb(io_base);
76 static int __init orion_nand_probe(struct platform_device *pdev)
80 struct orion_nand_data *board;
82 void __iomem *io_base;
84 struct mtd_partition *partitions = NULL;
87 nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
89 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
93 mtd = (struct mtd_info *)(nc + 1);
95 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101 io_base = ioremap(res->start, resource_size(res));
103 printk(KERN_ERR "orion_nand: ioremap failed\n");
108 board = pdev->dev.platform_data;
111 mtd->owner = THIS_MODULE;
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;
119 if (board->chip_delay)
120 nc->chip_delay = board->chip_delay;
122 if (board->width == 16)
123 nc->options |= NAND_BUSWIDTH_16;
125 if (board->dev_ready)
126 nc->dev_ready = board->dev_ready;
128 platform_set_drvdata(pdev, mtd);
130 if (nand_scan(mtd, 1)) {
135 #ifdef CONFIG_MTD_CMDLINE_PARTS
136 mtd->name = "orion_nand";
137 num_part = parse_mtd_partitions(mtd, part_probes, &partitions, 0);
139 /* If cmdline partitions have been passed, let them be used */
141 num_part = board->nr_parts;
142 partitions = board->parts;
145 ret = mtd_device_register(mtd, partitions, num_part);
154 platform_set_drvdata(pdev, NULL);
162 static int __devexit orion_nand_remove(struct platform_device *pdev)
164 struct mtd_info *mtd = platform_get_drvdata(pdev);
165 struct nand_chip *nc = mtd->priv;
169 iounmap(nc->IO_ADDR_W);
176 static struct platform_driver orion_nand_driver = {
177 .remove = __devexit_p(orion_nand_remove),
179 .name = "orion_nand",
180 .owner = THIS_MODULE,
184 static int __init orion_nand_init(void)
186 return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
189 static void __exit orion_nand_exit(void)
191 platform_driver_unregister(&orion_nand_driver);
194 module_init(orion_nand_init);
195 module_exit(orion_nand_exit);
197 MODULE_LICENSE("GPL");
198 MODULE_AUTHOR("Tzachi Perelstein");
199 MODULE_DESCRIPTION("NAND glue for Orion platforms");
200 MODULE_ALIAS("platform:orion_nand");