2 * NAND support for Marvell Orion SoC platforms
4 * Tzachi Perelstein <tzachi@marvell.com>
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
15 #include <linux/mtd/mtd.h>
16 #include <linux/mtd/rawnand.h>
17 #include <linux/mtd/partitions.h>
18 #include <linux/clk.h>
19 #include <linux/err.h>
21 #include <linux/sizes.h>
22 #include <linux/platform_data/mtd-orion_nand.h>
24 struct orion_nand_info {
25 struct nand_chip chip;
29 static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
31 struct nand_chip *nc = mtd_to_nand(mtd);
32 struct orion_nand_data *board = nand_get_controller_data(nc);
35 if (cmd == NAND_CMD_NONE)
39 offs = (1 << board->cle);
40 else if (ctrl & NAND_ALE)
41 offs = (1 << board->ale);
45 if (nc->options & NAND_BUSWIDTH_16)
48 writeb(cmd, nc->IO_ADDR_W + offs);
51 static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
53 struct nand_chip *chip = mtd_to_nand(mtd);
54 void __iomem *io_base = chip->IO_ADDR_R;
55 #if defined(__LINUX_ARM_ARCH__) && __LINUX_ARM_ARCH__ >= 5
60 while (len && (unsigned long)buf & 7) {
61 *buf++ = readb(io_base);
64 #if defined(__LINUX_ARM_ARCH__) && __LINUX_ARM_ARCH__ >= 5
65 buf64 = (uint64_t *)buf;
68 * Since GCC has no proper constraint (PR 43518)
69 * force x variable to r2/r3 registers as ldrd instruction
70 * requires first register to be even.
72 register uint64_t x asm ("r2");
74 asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
79 readsl(io_base, buf, len/4);
83 buf[i++] = readb(io_base);
86 static int __init orion_nand_probe(struct platform_device *pdev)
88 struct orion_nand_info *info;
91 struct orion_nand_data *board;
93 void __iomem *io_base;
97 info = devm_kzalloc(&pdev->dev,
98 sizeof(struct orion_nand_info),
103 mtd = nand_to_mtd(nc);
105 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106 io_base = devm_ioremap_resource(&pdev->dev, res);
109 return PTR_ERR(io_base);
111 if (pdev->dev.of_node) {
112 board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data),
116 if (!of_property_read_u32(pdev->dev.of_node, "cle", &val))
117 board->cle = (u8)val;
120 if (!of_property_read_u32(pdev->dev.of_node, "ale", &val))
121 board->ale = (u8)val;
124 if (!of_property_read_u32(pdev->dev.of_node,
126 board->width = (u8)val * 8;
129 if (!of_property_read_u32(pdev->dev.of_node,
131 board->chip_delay = (u8)val;
133 board = dev_get_platdata(&pdev->dev);
136 mtd->dev.parent = &pdev->dev;
138 nand_set_controller_data(nc, board);
139 nand_set_flash_node(nc, pdev->dev.of_node);
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;
144 nc->ecc.algo = NAND_ECC_HAMMING;
146 if (board->chip_delay)
147 nc->chip_delay = board->chip_delay;
149 WARN(board->width > 16,
150 "%d bit bus width out of range",
153 if (board->width == 16)
154 nc->options |= NAND_BUSWIDTH_16;
156 platform_set_drvdata(pdev, info);
158 /* Not all platforms can gate the clock, so it is not
159 an error if the clock does not exists. */
160 info->clk = devm_clk_get(&pdev->dev, NULL);
161 if (IS_ERR(info->clk)) {
162 ret = PTR_ERR(info->clk);
163 if (ret == -ENOENT) {
166 dev_err(&pdev->dev, "failed to get clock!\n");
171 ret = clk_prepare_enable(info->clk);
173 dev_err(&pdev->dev, "failed to prepare clock!\n");
177 ret = nand_scan(nc, 1);
181 mtd->name = "orion_nand";
182 ret = mtd_device_register(mtd, board->parts, board->nr_parts);
191 clk_disable_unprepare(info->clk);
195 static int orion_nand_remove(struct platform_device *pdev)
197 struct orion_nand_info *info = platform_get_drvdata(pdev);
198 struct nand_chip *chip = &info->chip;
202 clk_disable_unprepare(info->clk);
208 static const struct of_device_id orion_nand_of_match_table[] = {
209 { .compatible = "marvell,orion-nand", },
212 MODULE_DEVICE_TABLE(of, orion_nand_of_match_table);
215 static struct platform_driver orion_nand_driver = {
216 .remove = orion_nand_remove,
218 .name = "orion_nand",
219 .of_match_table = of_match_ptr(orion_nand_of_match_table),
223 module_platform_driver_probe(orion_nand_driver, orion_nand_probe);
225 MODULE_LICENSE("GPL");
226 MODULE_AUTHOR("Tzachi Perelstein");
227 MODULE_DESCRIPTION("NAND glue for Orion platforms");
228 MODULE_ALIAS("platform:orion_nand");