1 // SPDX-License-Identifier: GPL-2.0
3 * Ingenic JZ47xx NAND driver
5 * Copyright (c) 2015 Imagination Technologies
6 * Author: Alex Smith <alex.smith@imgtec.com>
9 #include <linux/delay.h>
10 #include <linux/init.h>
12 #include <linux/list.h>
13 #include <linux/module.h>
15 #include <linux/of_address.h>
16 #include <linux/of_device.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
20 #include <linux/mtd/mtd.h>
21 #include <linux/mtd/rawnand.h>
22 #include <linux/mtd/partitions.h>
24 #include <linux/jz4780-nemc.h>
26 #include "ingenic_ecc.h"
28 #define DRV_NAME "ingenic-nand"
30 /* Command delay when there is no R/B pin. */
31 #define RB_DELAY_US 100
34 unsigned long data_offset;
35 unsigned long addr_offset;
36 unsigned long cmd_offset;
37 const struct mtd_ooblayout_ops *oob_layout;
40 struct ingenic_nand_cs {
47 struct ingenic_ecc *ecc;
48 const struct jz_soc_info *soc_info;
49 struct nand_controller controller;
50 unsigned int num_banks;
51 struct list_head chips;
53 struct ingenic_nand_cs cs[];
57 struct nand_chip chip;
58 struct list_head chip_list;
60 struct gpio_desc *busy_gpio;
61 struct gpio_desc *wp_gpio;
62 unsigned int reading: 1;
65 static inline struct ingenic_nand *to_ingenic_nand(struct mtd_info *mtd)
67 return container_of(mtd_to_nand(mtd), struct ingenic_nand, chip);
70 static inline struct ingenic_nfc *to_ingenic_nfc(struct nand_controller *ctrl)
72 return container_of(ctrl, struct ingenic_nfc, controller);
75 static int qi_lb60_ooblayout_ecc(struct mtd_info *mtd, int section,
76 struct mtd_oob_region *oobregion)
78 struct nand_chip *chip = mtd_to_nand(mtd);
79 struct nand_ecc_ctrl *ecc = &chip->ecc;
81 if (section || !ecc->total)
84 oobregion->length = ecc->total;
85 oobregion->offset = 12;
90 static int qi_lb60_ooblayout_free(struct mtd_info *mtd, int section,
91 struct mtd_oob_region *oobregion)
93 struct nand_chip *chip = mtd_to_nand(mtd);
94 struct nand_ecc_ctrl *ecc = &chip->ecc;
99 oobregion->length = mtd->oobsize - ecc->total - 12;
100 oobregion->offset = 12 + ecc->total;
105 const struct mtd_ooblayout_ops qi_lb60_ooblayout_ops = {
106 .ecc = qi_lb60_ooblayout_ecc,
107 .free = qi_lb60_ooblayout_free,
110 static int jz4725b_ooblayout_ecc(struct mtd_info *mtd, int section,
111 struct mtd_oob_region *oobregion)
113 struct nand_chip *chip = mtd_to_nand(mtd);
114 struct nand_ecc_ctrl *ecc = &chip->ecc;
116 if (section || !ecc->total)
119 oobregion->length = ecc->total;
120 oobregion->offset = 3;
125 static int jz4725b_ooblayout_free(struct mtd_info *mtd, int section,
126 struct mtd_oob_region *oobregion)
128 struct nand_chip *chip = mtd_to_nand(mtd);
129 struct nand_ecc_ctrl *ecc = &chip->ecc;
134 oobregion->length = mtd->oobsize - ecc->total - 3;
135 oobregion->offset = 3 + ecc->total;
140 static const struct mtd_ooblayout_ops jz4725b_ooblayout_ops = {
141 .ecc = jz4725b_ooblayout_ecc,
142 .free = jz4725b_ooblayout_free,
145 static void ingenic_nand_select_chip(struct nand_chip *chip, int chipnr)
147 struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
148 struct ingenic_nfc *nfc = to_ingenic_nfc(nand->chip.controller);
149 struct ingenic_nand_cs *cs;
151 /* Ensure the currently selected chip is deasserted. */
152 if (chipnr == -1 && nfc->selected >= 0) {
153 cs = &nfc->cs[nfc->selected];
154 jz4780_nemc_assert(nfc->dev, cs->bank, false);
157 nfc->selected = chipnr;
160 static void ingenic_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
163 struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
164 struct ingenic_nfc *nfc = to_ingenic_nfc(nand->chip.controller);
165 struct ingenic_nand_cs *cs;
167 if (WARN_ON(nfc->selected < 0))
170 cs = &nfc->cs[nfc->selected];
172 jz4780_nemc_assert(nfc->dev, cs->bank, ctrl & NAND_NCE);
174 if (cmd == NAND_CMD_NONE)
178 writeb(cmd, cs->base + nfc->soc_info->addr_offset);
179 else if (ctrl & NAND_CLE)
180 writeb(cmd, cs->base + nfc->soc_info->cmd_offset);
183 static int ingenic_nand_dev_ready(struct nand_chip *chip)
185 struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
187 return !gpiod_get_value_cansleep(nand->busy_gpio);
190 static void ingenic_nand_ecc_hwctl(struct nand_chip *chip, int mode)
192 struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
194 nand->reading = (mode == NAND_ECC_READ);
197 static int ingenic_nand_ecc_calculate(struct nand_chip *chip, const u8 *dat,
200 struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
201 struct ingenic_nfc *nfc = to_ingenic_nfc(nand->chip.controller);
202 struct ingenic_ecc_params params;
205 * Don't need to generate the ECC when reading, the ECC engine does it
206 * for us as part of decoding/correction.
211 params.size = nand->chip.ecc.size;
212 params.bytes = nand->chip.ecc.bytes;
213 params.strength = nand->chip.ecc.strength;
215 return ingenic_ecc_calculate(nfc->ecc, ¶ms, dat, ecc_code);
218 static int ingenic_nand_ecc_correct(struct nand_chip *chip, u8 *dat,
219 u8 *read_ecc, u8 *calc_ecc)
221 struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
222 struct ingenic_nfc *nfc = to_ingenic_nfc(nand->chip.controller);
223 struct ingenic_ecc_params params;
225 params.size = nand->chip.ecc.size;
226 params.bytes = nand->chip.ecc.bytes;
227 params.strength = nand->chip.ecc.strength;
229 return ingenic_ecc_correct(nfc->ecc, ¶ms, dat, read_ecc);
232 static int ingenic_nand_attach_chip(struct nand_chip *chip)
234 struct mtd_info *mtd = nand_to_mtd(chip);
235 struct ingenic_nfc *nfc = to_ingenic_nfc(chip->controller);
238 if (chip->ecc.strength == 4) {
239 /* JZ4740 uses 9 bytes of ECC to correct maximum 4 errors */
242 chip->ecc.bytes = fls((1 + 8) * chip->ecc.size) *
243 (chip->ecc.strength / 8);
246 switch (chip->ecc.mode) {
249 dev_err(nfc->dev, "HW ECC selected, but ECC controller not found\n");
253 chip->ecc.hwctl = ingenic_nand_ecc_hwctl;
254 chip->ecc.calculate = ingenic_nand_ecc_calculate;
255 chip->ecc.correct = ingenic_nand_ecc_correct;
258 dev_info(nfc->dev, "using %s (strength %d, size %d, bytes %d)\n",
259 (nfc->ecc) ? "hardware ECC" : "software ECC",
260 chip->ecc.strength, chip->ecc.size, chip->ecc.bytes);
263 dev_info(nfc->dev, "not using ECC\n");
266 dev_err(nfc->dev, "ECC mode %d not supported\n",
271 /* The NAND core will generate the ECC layout for SW ECC */
272 if (chip->ecc.mode != NAND_ECC_HW)
275 /* Generate ECC layout. ECC codes are right aligned in the OOB area. */
276 eccbytes = mtd->writesize / chip->ecc.size * chip->ecc.bytes;
278 if (eccbytes > mtd->oobsize - 2) {
280 "invalid ECC config: required %d ECC bytes, but only %d are available",
281 eccbytes, mtd->oobsize - 2);
286 * The generic layout for BBT markers will most likely overlap with our
287 * ECC bytes in the OOB, so move the BBT markers outside the OOB area.
289 if (chip->bbt_options & NAND_BBT_USE_FLASH)
290 chip->bbt_options |= NAND_BBT_NO_OOB;
292 /* For legacy reasons we use a different layout on the qi,lb60 board. */
293 if (of_machine_is_compatible("qi,lb60"))
294 mtd_set_ooblayout(mtd, &qi_lb60_ooblayout_ops);
296 mtd_set_ooblayout(mtd, nfc->soc_info->oob_layout);
301 static const struct nand_controller_ops ingenic_nand_controller_ops = {
302 .attach_chip = ingenic_nand_attach_chip,
305 static int ingenic_nand_init_chip(struct platform_device *pdev,
306 struct ingenic_nfc *nfc,
307 struct device_node *np,
310 struct device *dev = &pdev->dev;
311 struct ingenic_nand *nand;
312 struct ingenic_nand_cs *cs;
313 struct resource *res;
314 struct nand_chip *chip;
315 struct mtd_info *mtd;
319 cs = &nfc->cs[chipnr];
321 reg = of_get_property(np, "reg", NULL);
325 cs->bank = be32_to_cpu(*reg);
327 jz4780_nemc_set_type(nfc->dev, cs->bank, JZ4780_NEMC_BANK_NAND);
329 res = platform_get_resource(pdev, IORESOURCE_MEM, chipnr);
330 cs->base = devm_ioremap_resource(dev, res);
331 if (IS_ERR(cs->base))
332 return PTR_ERR(cs->base);
334 nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
338 nand->busy_gpio = devm_gpiod_get_optional(dev, "rb", GPIOD_IN);
340 if (IS_ERR(nand->busy_gpio)) {
341 ret = PTR_ERR(nand->busy_gpio);
342 dev_err(dev, "failed to request busy GPIO: %d\n", ret);
344 } else if (nand->busy_gpio) {
345 nand->chip.legacy.dev_ready = ingenic_nand_dev_ready;
348 nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
350 if (IS_ERR(nand->wp_gpio)) {
351 ret = PTR_ERR(nand->wp_gpio);
352 dev_err(dev, "failed to request WP GPIO: %d\n", ret);
357 mtd = nand_to_mtd(chip);
358 mtd->name = devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev),
362 mtd->dev.parent = dev;
364 chip->legacy.IO_ADDR_R = cs->base + nfc->soc_info->data_offset;
365 chip->legacy.IO_ADDR_W = cs->base + nfc->soc_info->data_offset;
366 chip->legacy.chip_delay = RB_DELAY_US;
367 chip->options = NAND_NO_SUBPAGE_WRITE;
368 chip->legacy.select_chip = ingenic_nand_select_chip;
369 chip->legacy.cmd_ctrl = ingenic_nand_cmd_ctrl;
370 chip->ecc.mode = NAND_ECC_HW;
371 chip->controller = &nfc->controller;
372 nand_set_flash_node(chip, np);
374 chip->controller->ops = &ingenic_nand_controller_ops;
375 ret = nand_scan(chip, 1);
379 ret = mtd_device_register(mtd, NULL, 0);
385 list_add_tail(&nand->chip_list, &nfc->chips);
390 static void ingenic_nand_cleanup_chips(struct ingenic_nfc *nfc)
392 struct ingenic_nand *chip;
394 while (!list_empty(&nfc->chips)) {
395 chip = list_first_entry(&nfc->chips,
396 struct ingenic_nand, chip_list);
397 nand_release(&chip->chip);
398 list_del(&chip->chip_list);
402 static int ingenic_nand_init_chips(struct ingenic_nfc *nfc,
403 struct platform_device *pdev)
405 struct device *dev = &pdev->dev;
406 struct device_node *np;
409 int num_chips = of_get_child_count(dev->of_node);
411 if (num_chips > nfc->num_banks) {
412 dev_err(dev, "found %d chips but only %d banks\n",
413 num_chips, nfc->num_banks);
417 for_each_child_of_node(dev->of_node, np) {
418 ret = ingenic_nand_init_chip(pdev, nfc, np, i);
420 ingenic_nand_cleanup_chips(nfc);
430 static int ingenic_nand_probe(struct platform_device *pdev)
432 struct device *dev = &pdev->dev;
433 unsigned int num_banks;
434 struct ingenic_nfc *nfc;
437 num_banks = jz4780_nemc_num_banks(dev);
438 if (num_banks == 0) {
439 dev_err(dev, "no banks found\n");
443 nfc = devm_kzalloc(dev, struct_size(nfc, cs, num_banks), GFP_KERNEL);
447 nfc->soc_info = device_get_match_data(dev);
452 * Check for ECC HW before we call nand_scan_ident, to prevent us from
453 * having to call it again if the ECC driver returns -EPROBE_DEFER.
455 nfc->ecc = of_ingenic_ecc_get(dev->of_node);
456 if (IS_ERR(nfc->ecc))
457 return PTR_ERR(nfc->ecc);
460 nfc->num_banks = num_banks;
462 nand_controller_init(&nfc->controller);
463 INIT_LIST_HEAD(&nfc->chips);
465 ret = ingenic_nand_init_chips(nfc, pdev);
468 ingenic_ecc_release(nfc->ecc);
472 platform_set_drvdata(pdev, nfc);
476 static int ingenic_nand_remove(struct platform_device *pdev)
478 struct ingenic_nfc *nfc = platform_get_drvdata(pdev);
481 ingenic_ecc_release(nfc->ecc);
483 ingenic_nand_cleanup_chips(nfc);
488 static const struct jz_soc_info jz4740_soc_info = {
489 .data_offset = 0x00000000,
490 .cmd_offset = 0x00008000,
491 .addr_offset = 0x00010000,
492 .oob_layout = &nand_ooblayout_lp_ops,
495 static const struct jz_soc_info jz4725b_soc_info = {
496 .data_offset = 0x00000000,
497 .cmd_offset = 0x00008000,
498 .addr_offset = 0x00010000,
499 .oob_layout = &jz4725b_ooblayout_ops,
502 static const struct jz_soc_info jz4780_soc_info = {
503 .data_offset = 0x00000000,
504 .cmd_offset = 0x00400000,
505 .addr_offset = 0x00800000,
506 .oob_layout = &nand_ooblayout_lp_ops,
509 static const struct of_device_id ingenic_nand_dt_match[] = {
510 { .compatible = "ingenic,jz4740-nand", .data = &jz4740_soc_info },
511 { .compatible = "ingenic,jz4725b-nand", .data = &jz4725b_soc_info },
512 { .compatible = "ingenic,jz4780-nand", .data = &jz4780_soc_info },
515 MODULE_DEVICE_TABLE(of, ingenic_nand_dt_match);
517 static struct platform_driver ingenic_nand_driver = {
518 .probe = ingenic_nand_probe,
519 .remove = ingenic_nand_remove,
522 .of_match_table = of_match_ptr(ingenic_nand_dt_match),
525 module_platform_driver(ingenic_nand_driver);
527 MODULE_AUTHOR("Alex Smith <alex@alex-smith.me.uk>");
528 MODULE_AUTHOR("Harvey Hunt <harveyhuntnexus@gmail.com>");
529 MODULE_DESCRIPTION("Ingenic JZ47xx NAND driver");
530 MODULE_LICENSE("GPL v2");