2 * NAND flash driver for the MikroTik RouterBoard 4xx series
4 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * This file was based on the driver for Linux 2.6.22 published by
8 * MikroTik for their RouterBoard 4xx series devices.
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/mtd/nand.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/partitions.h>
21 #include <linux/platform_device.h>
22 #include <linux/delay.h>
24 #include <linux/gpio.h>
25 #include <linux/slab.h>
26 #include <linux/version.h>
28 #include <asm/mach-ath79/ath79.h>
29 #include <asm/mach-ath79/rb4xx_cpld.h>
31 #define DRV_NAME "rb4xx-nand"
32 #define DRV_VERSION "0.2.0"
33 #define DRV_DESC "NAND flash driver for RouterBoard 4xx series"
35 #define RB4XX_NAND_GPIO_READY 5
36 #define RB4XX_NAND_GPIO_ALE 37
37 #define RB4XX_NAND_GPIO_CLE 38
38 #define RB4XX_NAND_GPIO_NCE 39
40 struct rb4xx_nand_info {
41 struct nand_chip chip;
42 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
47 static inline struct rb4xx_nand_info *mtd_to_rbinfo(struct mtd_info *mtd)
49 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
50 return container_of(mtd, struct rb4xx_nand_info, mtd);
52 struct nand_chip *chip = mtd_to_nand(mtd);
54 return container_of(chip, struct rb4xx_nand_info, chip);
58 static struct mtd_info *rbinfo_to_mtd(struct rb4xx_nand_info *nfc)
60 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
63 return nand_to_mtd(&nfc->chip);
67 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
69 * We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader
70 * will not be able to find the kernel that we load.
72 static struct nand_ecclayout rb4xx_nand_ecclayout = {
74 .eccpos = { 8, 9, 10, 13, 14, 15 },
76 .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
81 static int rb4xx_ooblayout_ecc(struct mtd_info *mtd, int section,
82 struct mtd_oob_region *oobregion)
86 oobregion->offset = 8;
87 oobregion->length = 3;
90 oobregion->offset = 13;
91 oobregion->length = 3;
98 static int rb4xx_ooblayout_free(struct mtd_info *mtd, int section,
99 struct mtd_oob_region *oobregion)
103 oobregion->offset = 0;
104 oobregion->length = 4;
107 oobregion->offset = 4;
108 oobregion->length = 1;
111 oobregion->offset = 6;
112 oobregion->length = 2;
115 oobregion->offset = 11;
116 oobregion->length = 2;
123 static const struct mtd_ooblayout_ops rb4xx_nand_ecclayout_ops = {
124 .ecc = rb4xx_ooblayout_ecc,
125 .free = rb4xx_ooblayout_free,
129 static struct mtd_partition rb4xx_nand_partitions[] = {
133 .size = (256 * 1024),
134 .mask_flags = MTD_WRITEABLE,
138 .offset = (256 * 1024),
139 .size = (4 * 1024 * 1024) - (256 * 1024),
143 .offset = MTDPART_OFS_NXTBLK,
144 .size = MTDPART_SIZ_FULL,
148 static int rb4xx_nand_dev_ready(struct mtd_info *mtd)
150 return gpio_get_value_cansleep(RB4XX_NAND_GPIO_READY);
153 static void rb4xx_nand_write_cmd(unsigned char cmd)
155 unsigned char data = cmd;
158 err = rb4xx_cpld_write(&data, 1);
160 pr_err("rb4xx_nand: write cmd failed, err=%d\n", err);
163 static void rb4xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
166 if (ctrl & NAND_CTRL_CHANGE) {
167 gpio_set_value_cansleep(RB4XX_NAND_GPIO_CLE,
168 (ctrl & NAND_CLE) ? 1 : 0);
169 gpio_set_value_cansleep(RB4XX_NAND_GPIO_ALE,
170 (ctrl & NAND_ALE) ? 1 : 0);
171 gpio_set_value_cansleep(RB4XX_NAND_GPIO_NCE,
172 (ctrl & NAND_NCE) ? 0 : 1);
175 if (cmd != NAND_CMD_NONE)
176 rb4xx_nand_write_cmd(cmd);
179 static unsigned char rb4xx_nand_read_byte(struct mtd_info *mtd)
181 unsigned char data = 0;
184 err = rb4xx_cpld_read(&data, 1);
186 pr_err("rb4xx_nand: read data failed, err=%d\n", err);
193 static void rb4xx_nand_write_buf(struct mtd_info *mtd, const unsigned char *buf,
198 err = rb4xx_cpld_write(buf, len);
200 pr_err("rb4xx_nand: write buf failed, err=%d\n", err);
203 static void rb4xx_nand_read_buf(struct mtd_info *mtd, unsigned char *buf,
208 err = rb4xx_cpld_read(buf, len);
210 pr_err("rb4xx_nand: read buf failed, err=%d\n", err);
213 static int rb4xx_nand_probe(struct platform_device *pdev)
215 struct rb4xx_nand_info *info;
216 struct mtd_info *mtd;
219 printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
221 ret = gpio_request(RB4XX_NAND_GPIO_READY, "NAND RDY");
223 dev_err(&pdev->dev, "unable to request gpio %d\n",
224 RB4XX_NAND_GPIO_READY);
228 ret = gpio_direction_input(RB4XX_NAND_GPIO_READY);
230 dev_err(&pdev->dev, "unable to set input mode on gpio %d\n",
231 RB4XX_NAND_GPIO_READY);
232 goto err_free_gpio_ready;
235 ret = gpio_request(RB4XX_NAND_GPIO_ALE, "NAND ALE");
237 dev_err(&pdev->dev, "unable to request gpio %d\n",
238 RB4XX_NAND_GPIO_ALE);
239 goto err_free_gpio_ready;
242 ret = gpio_direction_output(RB4XX_NAND_GPIO_ALE, 0);
244 dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
245 RB4XX_NAND_GPIO_ALE);
246 goto err_free_gpio_ale;
249 ret = gpio_request(RB4XX_NAND_GPIO_CLE, "NAND CLE");
251 dev_err(&pdev->dev, "unable to request gpio %d\n",
252 RB4XX_NAND_GPIO_CLE);
253 goto err_free_gpio_ale;
256 ret = gpio_direction_output(RB4XX_NAND_GPIO_CLE, 0);
258 dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
259 RB4XX_NAND_GPIO_CLE);
260 goto err_free_gpio_cle;
263 ret = gpio_request(RB4XX_NAND_GPIO_NCE, "NAND NCE");
265 dev_err(&pdev->dev, "unable to request gpio %d\n",
266 RB4XX_NAND_GPIO_NCE);
267 goto err_free_gpio_cle;
270 ret = gpio_direction_output(RB4XX_NAND_GPIO_NCE, 1);
272 dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
273 RB4XX_NAND_GPIO_ALE);
274 goto err_free_gpio_nce;
277 info = kzalloc(sizeof(*info), GFP_KERNEL);
279 dev_err(&pdev->dev, "rb4xx-nand: no memory for private data\n");
281 goto err_free_gpio_nce;
284 info->chip.priv = &info;
285 mtd = rbinfo_to_mtd(info);
287 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
288 mtd->priv = &info->chip;
290 mtd->owner = THIS_MODULE;
292 info->chip.cmd_ctrl = rb4xx_nand_cmd_ctrl;
293 info->chip.dev_ready = rb4xx_nand_dev_ready;
294 info->chip.read_byte = rb4xx_nand_read_byte;
295 info->chip.write_buf = rb4xx_nand_write_buf;
296 info->chip.read_buf = rb4xx_nand_read_buf;
298 info->chip.chip_delay = 25;
299 info->chip.ecc.mode = NAND_ECC_SOFT;
300 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)
301 info->chip.ecc.algo = NAND_ECC_HAMMING;
303 info->chip.options = NAND_NO_SUBPAGE_WRITE;
305 platform_set_drvdata(pdev, info);
307 ret = nand_scan_ident(mtd, 1, NULL);
313 if (mtd->writesize == 512)
314 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
315 info->chip.ecc.layout = &rb4xx_nand_ecclayout;
317 mtd_set_ooblayout(mtd, &rb4xx_nand_ecclayout_ops);
320 ret = nand_scan_tail(mtd);
323 goto err_set_drvdata;
326 mtd_device_register(mtd, rb4xx_nand_partitions,
327 ARRAY_SIZE(rb4xx_nand_partitions));
329 goto err_release_nand;
336 platform_set_drvdata(pdev, NULL);
340 gpio_free(RB4XX_NAND_GPIO_NCE);
342 gpio_free(RB4XX_NAND_GPIO_CLE);
344 gpio_free(RB4XX_NAND_GPIO_ALE);
346 gpio_free(RB4XX_NAND_GPIO_READY);
351 static int rb4xx_nand_remove(struct platform_device *pdev)
353 struct rb4xx_nand_info *info = platform_get_drvdata(pdev);
355 nand_release(rbinfo_to_mtd(info));
356 platform_set_drvdata(pdev, NULL);
358 gpio_free(RB4XX_NAND_GPIO_NCE);
359 gpio_free(RB4XX_NAND_GPIO_CLE);
360 gpio_free(RB4XX_NAND_GPIO_ALE);
361 gpio_free(RB4XX_NAND_GPIO_READY);
366 static struct platform_driver rb4xx_nand_driver = {
367 .probe = rb4xx_nand_probe,
368 .remove = rb4xx_nand_remove,
371 .owner = THIS_MODULE,
375 static int __init rb4xx_nand_init(void)
377 return platform_driver_register(&rb4xx_nand_driver);
380 static void __exit rb4xx_nand_exit(void)
382 platform_driver_unregister(&rb4xx_nand_driver);
385 module_init(rb4xx_nand_init);
386 module_exit(rb4xx_nand_exit);
388 MODULE_DESCRIPTION(DRV_DESC);
389 MODULE_VERSION(DRV_VERSION);
390 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
391 MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
392 MODULE_LICENSE("GPL v2");