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>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/nand.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/clk.h>
21 #include <linux/err.h>
23 #include <asm/sizes.h>
24 #include <linux/platform_data/mtd-orion_nand.h>
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)
79 struct mtd_part_parser_data ppdata = {};
81 struct orion_nand_data *board;
84 void __iomem *io_base;
88 nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
90 printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
94 mtd = (struct mtd_info *)(nc + 1);
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
102 io_base = ioremap(res->start, resource_size(res));
104 printk(KERN_ERR "orion_nand: ioremap failed\n");
109 if (pdev->dev.of_node) {
110 board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data),
113 printk(KERN_ERR "orion_nand: failed to allocate board structure.\n");
117 if (!of_property_read_u32(pdev->dev.of_node, "cle", &val))
118 board->cle = (u8)val;
121 if (!of_property_read_u32(pdev->dev.of_node, "ale", &val))
122 board->ale = (u8)val;
125 if (!of_property_read_u32(pdev->dev.of_node,
127 board->width = (u8)val * 8;
130 if (!of_property_read_u32(pdev->dev.of_node,
132 board->chip_delay = (u8)val;
134 board = pdev->dev.platform_data;
137 mtd->owner = THIS_MODULE;
140 nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
141 nc->cmd_ctrl = orion_nand_cmd_ctrl;
142 nc->read_buf = orion_nand_read_buf;
143 nc->ecc.mode = NAND_ECC_SOFT;
145 if (board->chip_delay)
146 nc->chip_delay = board->chip_delay;
148 WARN(board->width > 16,
149 "%d bit bus width out of range",
152 if (board->width == 16)
153 nc->options |= NAND_BUSWIDTH_16;
155 if (board->dev_ready)
156 nc->dev_ready = board->dev_ready;
158 platform_set_drvdata(pdev, mtd);
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);
164 clk_prepare_enable(clk);
168 if (nand_scan(mtd, 1)) {
173 mtd->name = "orion_nand";
174 ppdata.of_node = pdev->dev.of_node;
175 ret = mtd_device_parse_register(mtd, NULL, &ppdata,
176 board->parts, board->nr_parts);
186 clk_disable_unprepare(clk);
189 platform_set_drvdata(pdev, NULL);
197 static int __devexit orion_nand_remove(struct platform_device *pdev)
199 struct mtd_info *mtd = platform_get_drvdata(pdev);
200 struct nand_chip *nc = mtd->priv;
205 iounmap(nc->IO_ADDR_W);
209 clk = clk_get(&pdev->dev, NULL);
211 clk_disable_unprepare(clk);
219 static struct of_device_id orion_nand_of_match_table[] = {
220 { .compatible = "marvell,orion-nand", },
225 static struct platform_driver orion_nand_driver = {
226 .remove = __devexit_p(orion_nand_remove),
228 .name = "orion_nand",
229 .owner = THIS_MODULE,
230 .of_match_table = of_match_ptr(orion_nand_of_match_table),
234 static int __init orion_nand_init(void)
236 return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
239 static void __exit orion_nand_exit(void)
241 platform_driver_unregister(&orion_nand_driver);
244 module_init(orion_nand_init);
245 module_exit(orion_nand_exit);
247 MODULE_LICENSE("GPL");
248 MODULE_AUTHOR("Tzachi Perelstein");
249 MODULE_DESCRIPTION("NAND glue for Orion platforms");
250 MODULE_ALIAS("platform:orion_nand");