1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright © 2004-2008 Simtec Electronics
7  * Samsung S3C2410/S3C2440/S3C2412 NAND driver
10 #define pr_fmt(fmt) "nand-s3c2410: " fmt
36 #include <linux/platform_data/mtd-nand-s3c2410.h>
73 /* new oob placement block for use with hardware ecc generation
79 		return -ERANGE;  in s3c2410_ooblayout_ecc()
81 	oobregion->offset = 0;  in s3c2410_ooblayout_ecc()
82 	oobregion->length = 3;  in s3c2410_ooblayout_ecc()
91 		return -ERANGE;  in s3c2410_ooblayout_free()
93 	oobregion->offset = 8;  in s3c2410_ooblayout_free()
94 	oobregion->length = 8;  in s3c2410_ooblayout_free()
100 	.ecc = s3c2410_ooblayout_ecc,
109  * struct s3c2410_nand_mtd - driver MTD structure
111  * @chip: The NAND chip information.
112  * @set: The platform information supplied for this set of NAND chips.
133 /* overview of the s3c2410 nand state */
136  * struct s3c2410_nand_info - NAND controller state.
142  * @sel_reg: Pointer to the register controlling the NAND selection.
143  * @sel_bit: The bit in @sel_reg to select the NAND chip.
200 	return s3c2410_nand_mtd_toours(mtd)->info;  in s3c2410_nand_mtd_toinfo()
210 	return dev_get_platdata(&dev->dev);  in to_nand_plat()
223  * s3c2410_nand_clk_set_state - Enable, disable or suspend NAND clock.
233 	if (info->clk_state == CLOCK_ENABLE) {  in s3c2410_nand_clk_set_state()
235 			clk_disable_unprepare(info->clk);  in s3c2410_nand_clk_set_state()
238 			clk_prepare_enable(info->clk);  in s3c2410_nand_clk_set_state()
241 	info->clk_state = new_state;  in s3c2410_nand_clk_set_state()
249  * s3c_nand_calc_rate - calculate timing data.
267 		return -1;  in s3c_nand_calc_rate()
281  * s3c2410_nand_setrate - setup controller timing information.
290 	struct s3c2410_platform_nand *plat = info->platform;  in s3c2410_nand_setrate()
291 	int tacls_max = (info->cpu_type == TYPE_S3C2412) ? 8 : 4;  in s3c2410_nand_setrate()
293 	unsigned long clkrate = clk_get_rate(info->clk);  in s3c2410_nand_setrate()
299 	info->clk_rate = clkrate;  in s3c2410_nand_setrate()
303 		tacls = s3c_nand_calc_rate(plat->tacls, clkrate, tacls_max);  in s3c2410_nand_setrate()
304 		twrph0 = s3c_nand_calc_rate(plat->twrph0, clkrate, 8);  in s3c2410_nand_setrate()
305 		twrph1 = s3c_nand_calc_rate(plat->twrph1, clkrate, 8);  in s3c2410_nand_setrate()
314 		dev_err(info->device, "cannot get suitable timings\n");  in s3c2410_nand_setrate()
315 		return -EINVAL;  in s3c2410_nand_setrate()
318 	dev_info(info->device, "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n",  in s3c2410_nand_setrate()
322 	switch (info->cpu_type) {  in s3c2410_nand_setrate()
328 		set |= S3C2410_NFCONF_TACLS(tacls - 1);  in s3c2410_nand_setrate()
329 		set |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);  in s3c2410_nand_setrate()
330 		set |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);  in s3c2410_nand_setrate()
335 		mask = (S3C2440_NFCONF_TACLS(tacls_max - 1) |  in s3c2410_nand_setrate()
339 		set = S3C2440_NFCONF_TACLS(tacls - 1);  in s3c2410_nand_setrate()
340 		set |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);  in s3c2410_nand_setrate()
341 		set |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);  in s3c2410_nand_setrate()
350 	cfg = readl(info->regs + S3C2410_NFCONF);  in s3c2410_nand_setrate()
353 	writel(cfg, info->regs + S3C2410_NFCONF);  in s3c2410_nand_setrate()
357 	dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg);  in s3c2410_nand_setrate()
363  * s3c2410_nand_inithw - basic hardware initialisation
377 	switch (info->cpu_type) {  in s3c2410_nand_inithw()
384 		/* enable the controller and de-assert nFCE */  in s3c2410_nand_inithw()
386 		writel(S3C2440_NFCONT_ENABLE, info->regs + S3C2440_NFCONT);  in s3c2410_nand_inithw()
393  * s3c2410_nand_select_chip - select the given nand chip
394  * @this: NAND chip object.
399  * chip can be de-selected.
412 	info = nmtd->info;  in s3c2410_nand_select_chip()
414 	if (chip != -1)  in s3c2410_nand_select_chip()
417 	cur = readl(info->sel_reg);  in s3c2410_nand_select_chip()
419 	if (chip == -1) {  in s3c2410_nand_select_chip()
420 		cur |= info->sel_bit;  in s3c2410_nand_select_chip()
422 		if (nmtd->set != NULL && chip > nmtd->set->nr_chips) {  in s3c2410_nand_select_chip()
423 			dev_err(info->device, "invalid chip %d\n", chip);  in s3c2410_nand_select_chip()
427 		if (info->platform != NULL) {  in s3c2410_nand_select_chip()
428 			if (info->platform->select_chip != NULL)  in s3c2410_nand_select_chip()
429 				(info->platform->select_chip) (nmtd->set, chip);  in s3c2410_nand_select_chip()
432 		cur &= ~info->sel_bit;  in s3c2410_nand_select_chip()
435 	writel(cur, info->sel_reg);  in s3c2410_nand_select_chip()
437 	if (chip == -1)  in s3c2410_nand_select_chip()
456 		writeb(cmd, info->regs + S3C2410_NFCMD);  in s3c2410_nand_hwcontrol()
458 		writeb(cmd, info->regs + S3C2410_NFADDR);  in s3c2410_nand_hwcontrol()
473 		writeb(cmd, info->regs + S3C2440_NFCMD);  in s3c2440_nand_hwcontrol()
475 		writeb(cmd, info->regs + S3C2440_NFADDR);  in s3c2440_nand_hwcontrol()
480  * returns 0 if the nand is busy, 1 if it is ready
487 	return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY;  in s3c2410_nand_devready()
494 	return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY;  in s3c2440_nand_devready()
501 	return readb(info->regs + S3C2412_NFSTAT) & S3C2412_NFSTAT_READY;  in s3c2412_nand_devready()
504 /* ECC handling functions */
525 		return 0;		/* ECC is ok */  in s3c2410_nand_correct_data()
527 	/* sometimes people do not think about using the ECC, so check  in s3c2410_nand_correct_data()
528 	 * to see if we have an 0xff,0xff,0xff read ECC and then ignore  in s3c2410_nand_correct_data()
529 	 * the error, on the assumption that this is an un-eccd page.  in s3c2410_nand_correct_data()
532 	    && info->platform->ignore_unset_ecc)  in s3c2410_nand_correct_data()
535 	/* Can we correct this ECC (ie, one row and column change).  in s3c2410_nand_correct_data()
559 		dev_dbg(info->device, "correcting error bit %d, byte %d\n",  in s3c2410_nand_correct_data()
566 	/* if there is only one bit difference in the ECC, then  in s3c2410_nand_correct_data()
568 	 * means the error is most probably in the ECC itself */  in s3c2410_nand_correct_data()
574 	if ((diff0 & (diff0 - 1)) == 0)  in s3c2410_nand_correct_data()
577 	return -1;  in s3c2410_nand_correct_data()
580 /* ECC functions
582  * These allow the s3c2410 and s3c2440 to use the controller's ECC
583  * generator block to ECC the data as it passes through]
592 	ctrl = readl(info->regs + S3C2410_NFCONF);  in s3c2410_nand_enable_hwecc()
594 	writel(ctrl, info->regs + S3C2410_NFCONF);  in s3c2410_nand_enable_hwecc()
603 	ctrl = readl(info->regs + S3C2440_NFCONT);  in s3c2412_nand_enable_hwecc()
605 	       info->regs + S3C2440_NFCONT);  in s3c2412_nand_enable_hwecc()
614 	ctrl = readl(info->regs + S3C2440_NFCONT);  in s3c2440_nand_enable_hwecc()
615 	writel(ctrl | S3C2440_NFCONT_INITECC, info->regs + S3C2440_NFCONT);  in s3c2440_nand_enable_hwecc()
624 	ecc_code[0] = readb(info->regs + S3C2410_NFECC + 0);  in s3c2410_nand_calculate_ecc()
625 	ecc_code[1] = readb(info->regs + S3C2410_NFECC + 1);  in s3c2410_nand_calculate_ecc()
626 	ecc_code[2] = readb(info->regs + S3C2410_NFECC + 2);  in s3c2410_nand_calculate_ecc()
628 	pr_debug("%s: returning ecc %*phN\n", __func__, 3, ecc_code);  in s3c2410_nand_calculate_ecc()
638 	unsigned long ecc = readl(info->regs + S3C2412_NFMECC0);  in s3c2412_nand_calculate_ecc()  local
640 	ecc_code[0] = ecc;  in s3c2412_nand_calculate_ecc()
641 	ecc_code[1] = ecc >> 8;  in s3c2412_nand_calculate_ecc()
642 	ecc_code[2] = ecc >> 16;  in s3c2412_nand_calculate_ecc()
644 	pr_debug("%s: returning ecc %*phN\n", __func__, 3, ecc_code);  in s3c2412_nand_calculate_ecc()
654 	unsigned long ecc = readl(info->regs + S3C2440_NFMECC0);  in s3c2440_nand_calculate_ecc()  local
656 	ecc_code[0] = ecc;  in s3c2440_nand_calculate_ecc()
657 	ecc_code[1] = ecc >> 8;  in s3c2440_nand_calculate_ecc()
658 	ecc_code[2] = ecc >> 16;  in s3c2440_nand_calculate_ecc()
660 	pr_debug("%s: returning ecc %06lx\n", __func__, ecc & 0xffffff);  in s3c2440_nand_calculate_ecc()
665 /* over-ride the standard functions for a little more speed. We can
671 	readsb(this->legacy.IO_ADDR_R, buf, len);  in s3c2410_nand_read_buf()
679 	readsl(info->regs + S3C2440_NFDATA, buf, len >> 2);  in s3c2440_nand_read_buf()
685 		for (; len & 3; len--)  in s3c2440_nand_read_buf()
686 			*buf++ = readb(info->regs + S3C2440_NFDATA);  in s3c2440_nand_read_buf()
693 	writesb(this->legacy.IO_ADDR_W, buf, len);  in s3c2410_nand_write_buf()
702 	writesl(info->regs + S3C2440_NFDATA, buf, len >> 2);  in s3c2440_nand_write_buf()
708 		for (; len & 3; len--, buf++)  in s3c2440_nand_write_buf()
709 			writeb(*buf, info->regs + S3C2440_NFDATA);  in s3c2440_nand_write_buf()
724 	newclk = clk_get_rate(info->clk);  in s3c2410_nand_cpufreq_transition()
726 	if ((val == CPUFREQ_POSTCHANGE && newclk < info->clk_rate) ||  in s3c2410_nand_cpufreq_transition()
727 	    (val == CPUFREQ_PRECHANGE && newclk > info->clk_rate)) {  in s3c2410_nand_cpufreq_transition()
736 	info->freq_transition.notifier_call = s3c2410_nand_cpufreq_transition;  in s3c2410_nand_cpufreq_register()
738 	return cpufreq_register_notifier(&info->freq_transition,  in s3c2410_nand_cpufreq_register()
745 	cpufreq_unregister_notifier(&info->freq_transition,  in s3c2410_nand_cpufreq_deregister()
776 	if (info->mtds != NULL) {  in s3c24xx_nand_remove()
777 		struct s3c2410_nand_mtd *ptr = info->mtds;  in s3c24xx_nand_remove()
780 		for (mtdno = 0; mtdno < info->mtd_count; mtdno++, ptr++) {  in s3c24xx_nand_remove()
782 			nand_release(&ptr->chip);  in s3c24xx_nand_remove()
788 	if (!IS_ERR(info->clk))  in s3c24xx_nand_remove()
799 		struct mtd_info *mtdinfo = nand_to_mtd(&mtd->chip);  in s3c2410_nand_add_partition()
801 		mtdinfo->name = set->name;  in s3c2410_nand_add_partition()
803 		return mtd_device_register(mtdinfo, set->partitions,  in s3c2410_nand_add_partition()
804 					   set->nr_partitions);  in s3c2410_nand_add_partition()
807 	return -ENODEV;  in s3c2410_nand_add_partition()
815 	struct s3c2410_platform_nand *pdata = info->platform;  in s3c2410_nand_setup_data_interface()
821 		return -ENOTSUPP;  in s3c2410_nand_setup_data_interface()
823 	tacls = timings->tCLS_min - timings->tWP_min;  in s3c2410_nand_setup_data_interface()
827 	pdata->tacls  = DIV_ROUND_UP(tacls, 1000);  in s3c2410_nand_setup_data_interface()
828 	pdata->twrph0 = DIV_ROUND_UP(timings->tWP_min, 1000);  in s3c2410_nand_setup_data_interface()
829 	pdata->twrph1 = DIV_ROUND_UP(timings->tCLH_min, 1000);  in s3c2410_nand_setup_data_interface()
835  * s3c2410_nand_init_chip - initialise a single instance of an chip
836  * @info: The base NAND controller the chip is on.
848 	struct device_node *np = info->device->of_node;  in s3c2410_nand_init_chip()
849 	struct nand_chip *chip = &nmtd->chip;  in s3c2410_nand_init_chip()
850 	void __iomem *regs = info->regs;  in s3c2410_nand_init_chip()
852 	nand_set_flash_node(chip, set->of_node);  in s3c2410_nand_init_chip()
854 	chip->legacy.write_buf    = s3c2410_nand_write_buf;  in s3c2410_nand_init_chip()
855 	chip->legacy.read_buf     = s3c2410_nand_read_buf;  in s3c2410_nand_init_chip()
856 	chip->legacy.select_chip  = s3c2410_nand_select_chip;  in s3c2410_nand_init_chip()
857 	chip->legacy.chip_delay   = 50;  in s3c2410_nand_init_chip()
859 	chip->options	   = set->options;  in s3c2410_nand_init_chip()
860 	chip->controller   = &info->controller;  in s3c2410_nand_init_chip()
864 	 * auto-detect timings only when booting with a device tree.  in s3c2410_nand_init_chip()
867 		chip->options |= NAND_KEEP_TIMINGS;  in s3c2410_nand_init_chip()
869 	switch (info->cpu_type) {  in s3c2410_nand_init_chip()
871 		chip->legacy.IO_ADDR_W = regs + S3C2410_NFDATA;  in s3c2410_nand_init_chip()
872 		info->sel_reg   = regs + S3C2410_NFCONF;  in s3c2410_nand_init_chip()
873 		info->sel_bit	= S3C2410_NFCONF_nFCE;  in s3c2410_nand_init_chip()
874 		chip->legacy.cmd_ctrl  = s3c2410_nand_hwcontrol;  in s3c2410_nand_init_chip()
875 		chip->legacy.dev_ready = s3c2410_nand_devready;  in s3c2410_nand_init_chip()
879 		chip->legacy.IO_ADDR_W = regs + S3C2440_NFDATA;  in s3c2410_nand_init_chip()
880 		info->sel_reg   = regs + S3C2440_NFCONT;  in s3c2410_nand_init_chip()
881 		info->sel_bit	= S3C2440_NFCONT_nFCE;  in s3c2410_nand_init_chip()
882 		chip->legacy.cmd_ctrl  = s3c2440_nand_hwcontrol;  in s3c2410_nand_init_chip()
883 		chip->legacy.dev_ready = s3c2440_nand_devready;  in s3c2410_nand_init_chip()
884 		chip->legacy.read_buf  = s3c2440_nand_read_buf;  in s3c2410_nand_init_chip()
885 		chip->legacy.write_buf	= s3c2440_nand_write_buf;  in s3c2410_nand_init_chip()
889 		chip->legacy.IO_ADDR_W = regs + S3C2440_NFDATA;  in s3c2410_nand_init_chip()
890 		info->sel_reg   = regs + S3C2440_NFCONT;  in s3c2410_nand_init_chip()
891 		info->sel_bit	= S3C2412_NFCONT_nFCE0;  in s3c2410_nand_init_chip()
892 		chip->legacy.cmd_ctrl  = s3c2440_nand_hwcontrol;  in s3c2410_nand_init_chip()
893 		chip->legacy.dev_ready = s3c2412_nand_devready;  in s3c2410_nand_init_chip()
896 			dev_info(info->device, "System booted from NAND\n");  in s3c2410_nand_init_chip()
901 	chip->legacy.IO_ADDR_R = chip->legacy.IO_ADDR_W;  in s3c2410_nand_init_chip()
903 	nmtd->info	   = info;  in s3c2410_nand_init_chip()
904 	nmtd->set	   = set;  in s3c2410_nand_init_chip()
906 	chip->ecc.mode = info->platform->ecc_mode;  in s3c2410_nand_init_chip()
909 	 * If you use u-boot BBT creation code, specifying this flag will  in s3c2410_nand_init_chip()
910 	 * let the kernel fish out the BBT from the NAND.  in s3c2410_nand_init_chip()
912 	if (set->flash_bbt)  in s3c2410_nand_init_chip()
913 		chip->bbt_options |= NAND_BBT_USE_FLASH;  in s3c2410_nand_init_chip()
917  * s3c2410_nand_attach_chip - Init the ECC engine after NAND scan
918  * @chip: The NAND chip
920  * This hook is called by the core after the identification of the NAND chip,
921  * once the relevant per-chip information is up to date.. This call ensure that
924  * The internal state is currently limited to the ECC state information.
931 	switch (chip->ecc.mode) {  in s3c2410_nand_attach_chip()
934 		dev_info(info->device, "ECC disabled\n");  in s3c2410_nand_attach_chip()
939 		 * This driver expects Hamming based ECC when ecc_mode is set  in s3c2410_nand_attach_chip()
940 		 * to NAND_ECC_SOFT. Force ecc.algo to NAND_ECC_HAMMING to  in s3c2410_nand_attach_chip()
944 		chip->ecc.algo = NAND_ECC_HAMMING;  in s3c2410_nand_attach_chip()
945 		dev_info(info->device, "soft ECC\n");  in s3c2410_nand_attach_chip()
949 		chip->ecc.calculate = s3c2410_nand_calculate_ecc;  in s3c2410_nand_attach_chip()
950 		chip->ecc.correct   = s3c2410_nand_correct_data;  in s3c2410_nand_attach_chip()
951 		chip->ecc.strength  = 1;  in s3c2410_nand_attach_chip()
953 		switch (info->cpu_type) {  in s3c2410_nand_attach_chip()
955 			chip->ecc.hwctl	    = s3c2410_nand_enable_hwecc;  in s3c2410_nand_attach_chip()
956 			chip->ecc.calculate = s3c2410_nand_calculate_ecc;  in s3c2410_nand_attach_chip()
960 			chip->ecc.hwctl     = s3c2412_nand_enable_hwecc;  in s3c2410_nand_attach_chip()
961 			chip->ecc.calculate = s3c2412_nand_calculate_ecc;  in s3c2410_nand_attach_chip()
965 			chip->ecc.hwctl     = s3c2440_nand_enable_hwecc;  in s3c2410_nand_attach_chip()
966 			chip->ecc.calculate = s3c2440_nand_calculate_ecc;  in s3c2410_nand_attach_chip()
970 		dev_dbg(info->device, "chip %p => page shift %d\n",  in s3c2410_nand_attach_chip()
971 			chip, chip->page_shift);  in s3c2410_nand_attach_chip()
974 		 * the large or small page nand device */  in s3c2410_nand_attach_chip()
975 		if (chip->page_shift > 10) {  in s3c2410_nand_attach_chip()
976 			chip->ecc.size	    = 256;  in s3c2410_nand_attach_chip()
977 			chip->ecc.bytes	    = 3;  in s3c2410_nand_attach_chip()
979 			chip->ecc.size	    = 512;  in s3c2410_nand_attach_chip()
980 			chip->ecc.bytes	    = 3;  in s3c2410_nand_attach_chip()
985 		dev_info(info->device, "hardware ECC\n");  in s3c2410_nand_attach_chip()
989 		dev_err(info->device, "invalid ECC mode!\n");  in s3c2410_nand_attach_chip()
990 		return -EINVAL;  in s3c2410_nand_attach_chip()
993 	if (chip->bbt_options & NAND_BBT_USE_FLASH)  in s3c2410_nand_attach_chip()
994 		chip->options |= NAND_SKIP_BBTSCAN;  in s3c2410_nand_attach_chip()
1006 		.compatible = "samsung,s3c2410-nand",
1010 		.compatible = "samsung,s3c2412-nand",
1013 		.compatible = "samsung,s3c2440-nand",
1025 	struct device_node *np = pdev->dev.of_node, *child;  in s3c24xx_nand_probe_dt()
1028 	devtype_data = of_device_get_match_data(&pdev->dev);  in s3c24xx_nand_probe_dt()
1030 		return -ENODEV;  in s3c24xx_nand_probe_dt()
1032 	info->cpu_type = devtype_data->type;  in s3c24xx_nand_probe_dt()
1034 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);  in s3c24xx_nand_probe_dt()
1036 		return -ENOMEM;  in s3c24xx_nand_probe_dt()
1038 	pdev->dev.platform_data = pdata;  in s3c24xx_nand_probe_dt()
1040 	pdata->nr_sets = of_get_child_count(np);  in s3c24xx_nand_probe_dt()
1041 	if (!pdata->nr_sets)  in s3c24xx_nand_probe_dt()
1044 	sets = devm_kcalloc(&pdev->dev, pdata->nr_sets, sizeof(*sets),  in s3c24xx_nand_probe_dt()
1047 		return -ENOMEM;  in s3c24xx_nand_probe_dt()
1049 	pdata->sets = sets;  in s3c24xx_nand_probe_dt()
1052 		sets->name = (char *)child->name;  in s3c24xx_nand_probe_dt()
1053 		sets->of_node = child;  in s3c24xx_nand_probe_dt()
1054 		sets->nr_chips = 1;  in s3c24xx_nand_probe_dt()
1068 	info->cpu_type = platform_get_device_id(pdev)->driver_data;  in s3c24xx_nand_probe_pdata()
1078  * nand layer to look for devices
1092 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);  in s3c24xx_nand_probe()
1094 		err = -ENOMEM;  in s3c24xx_nand_probe()
1100 	nand_controller_init(&info->controller);  in s3c24xx_nand_probe()
1101 	info->controller.ops = &s3c24xx_nand_controller_ops;  in s3c24xx_nand_probe()
1105 	info->clk = devm_clk_get(&pdev->dev, "nand");  in s3c24xx_nand_probe()
1106 	if (IS_ERR(info->clk)) {  in s3c24xx_nand_probe()
1107 		dev_err(&pdev->dev, "failed to get clock\n");  in s3c24xx_nand_probe()
1108 		err = -ENOENT;  in s3c24xx_nand_probe()
1114 	if (pdev->dev.of_node)  in s3c24xx_nand_probe()
1127 	res = pdev->resource;  in s3c24xx_nand_probe()
1130 	info->device	= &pdev->dev;  in s3c24xx_nand_probe()
1131 	info->platform	= plat;  in s3c24xx_nand_probe()
1133 	info->regs = devm_ioremap_resource(&pdev->dev, res);  in s3c24xx_nand_probe()
1134 	if (IS_ERR(info->regs)) {  in s3c24xx_nand_probe()
1135 		err = PTR_ERR(info->regs);  in s3c24xx_nand_probe()
1139 	dev_dbg(&pdev->dev, "mapped registers at %p\n", info->regs);  in s3c24xx_nand_probe()
1141 	if (!plat->sets || plat->nr_sets < 1) {  in s3c24xx_nand_probe()
1142 		err = -EINVAL;  in s3c24xx_nand_probe()
1146 	sets = plat->sets;  in s3c24xx_nand_probe()
1147 	nr_sets = plat->nr_sets;  in s3c24xx_nand_probe()
1149 	info->mtd_count = nr_sets;  in s3c24xx_nand_probe()
1153 	size = nr_sets * sizeof(*info->mtds);  in s3c24xx_nand_probe()
1154 	info->mtds = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);  in s3c24xx_nand_probe()
1155 	if (info->mtds == NULL) {  in s3c24xx_nand_probe()
1156 		err = -ENOMEM;  in s3c24xx_nand_probe()
1162 	nmtd = info->mtds;  in s3c24xx_nand_probe()
1165 		struct mtd_info *mtd = nand_to_mtd(&nmtd->chip);  in s3c24xx_nand_probe()
1170 		mtd->dev.parent = &pdev->dev;  in s3c24xx_nand_probe()
1173 		err = nand_scan(&nmtd->chip, sets ? sets->nr_chips : 1);  in s3c24xx_nand_probe()
1187 		dev_err(&pdev->dev, "failed to init cpufreq support\n");  in s3c24xx_nand_probe()
1192 		dev_info(&pdev->dev, "clock idle support enabled\n");  in s3c24xx_nand_probe()
1202 		err = -EINVAL;  in s3c24xx_nand_probe()
1214 		info->save_sel = readl(info->sel_reg);  in s3c24xx_nand_suspend()
1221 		writel(info->save_sel | info->sel_bit, info->sel_reg);  in s3c24xx_nand_suspend()
1240 		sel = readl(info->sel_reg);  in s3c24xx_nand_resume()
1241 		sel &= ~info->sel_bit;  in s3c24xx_nand_resume()
1242 		sel |= info->save_sel & info->sel_bit;  in s3c24xx_nand_resume()
1243 		writel(sel, info->sel_reg);  in s3c24xx_nand_resume()
1260 		.name		= "s3c2410-nand",
1263 		.name		= "s3c2440-nand",
1266 		.name		= "s3c2412-nand",
1269 		.name		= "s3c6400-nand",
1284 		.name	= "s3c24xx-nand",
1293 MODULE_DESCRIPTION("S3C24XX MTD NAND driver");