mtd: rawnand: macronix: Add support for deep power down mode (19301d54) · Commits · 戴 / test

drivers/mtd/nand/raw/nand_macronix.c

+74 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@
		* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
		*/

		#include "linux/delay.h"
		#include "internals.h"

		#define MACRONIX_READ_RETRY_BIT BIT(0)
		@@ -28,6 +29,8 @@
		(MACRONIX_RANDOMIZER_RANDEN \| \
		MACRONIX_RANDOMIZER_RANDOPT)

		#define MXIC_CMD_POWER_DOWN 0xB9

		struct nand_onfi_vendor_macronix {
		u8 reserved;
		u8 reliability_func;
		@@ -243,6 +246,76 @@ static void macronix_nand_block_protection_support(struct nand_chip *chip)
		chip->unlock_area = mxic_nand_unlock;
		}

		static int nand_power_down_op(struct nand_chip *chip)
		{
		int ret;

		if (nand_has_exec_op(chip)) {
		struct nand_op_instr instrs[] = {
		NAND_OP_CMD(MXIC_CMD_POWER_DOWN, 0),
		};

		struct nand_operation op = NAND_OPERATION(chip->cur_cs, instrs);

		ret = nand_exec_op(chip, &op);
		if (ret)
		return ret;

		} else {
		chip->legacy.cmdfunc(chip, MXIC_CMD_POWER_DOWN, -1, -1);
		}

		return 0;
		}

		static int mxic_nand_suspend(struct nand_chip *chip)
		{
		int ret;

		nand_select_target(chip, 0);
		ret = nand_power_down_op(chip);
		if (ret < 0)
		pr_err("Suspending MXIC NAND chip failed (%d)\n", ret);
		nand_deselect_target(chip);

		return ret;
		}

		static void mxic_nand_resume(struct nand_chip *chip)
		{
		/*
		* Toggle #CS pin to resume NAND device and don't care
		* of the others CLE, #WE, #RE pins status.
		* A NAND controller ensure it is able to assert/de-assert #CS
		* by sending any byte over the NAND bus.
		* i.e.,
		* NAND power down command or reset command w/o R/B# status checking.
		*/
		nand_select_target(chip, 0);
		nand_power_down_op(chip);
		/* The minimum of a recovery time tRDP is 35 us */
		usleep_range(35, 100);
		nand_deselect_target(chip);
		}

		static void macronix_nand_deep_power_down_support(struct nand_chip *chip)
		{
		int i;
		static const char * const deep_power_down_dev[] = {
		"MX30UF1G28AD",
		"MX30UF2G28AD",
		"MX30UF4G28AD",
		};

		i = match_string(deep_power_down_dev, ARRAY_SIZE(deep_power_down_dev),
		chip->parameters.model);
		if (i < 0)
		return;

		chip->suspend = mxic_nand_suspend;
		chip->resume = mxic_nand_resume;
		}

		static int macronix_nand_init(struct nand_chip *chip)
		{
		if (nand_is_slc(chip))
		@@ -251,6 +324,7 @@ static int macronix_nand_init(struct nand_chip *chip)
		macronix_nand_fix_broken_get_timings(chip);
		macronix_nand_onfi_init(chip);
		macronix_nand_block_protection_support(chip);
		macronix_nand_deep_power_down_support(chip);

		return 0;
		}

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