linux/drivers/soc/mediatek/mtk-infracfg.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 Pengutronix, Sascha Hauer <[email protected]>
 */

#include <linux/export.h>
#include <linux/jiffies.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/soc/mediatek/infracfg.h>
#include <asm/processor.h>

#define MTK_POLL_DELAY_US …
#define MTK_POLL_TIMEOUT …

/**
 * mtk_infracfg_set_bus_protection - enable bus protection
 * @infracfg: The infracfg regmap
 * @mask: The mask containing the protection bits to be enabled.
 * @reg_update: The boolean flag determines to set the protection bits
 *              by regmap_update_bits with enable register(PROTECTEN) or
 *              by regmap_write with set register(PROTECTEN_SET).
 *
 * This function enables the bus protection bits for disabled power
 * domains so that the system does not hang when some unit accesses the
 * bus while in power down.
 */
int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
		bool reg_update)
{ … }

/**
 * mtk_infracfg_clear_bus_protection - disable bus protection
 * @infracfg: The infracfg regmap
 * @mask: The mask containing the protection bits to be disabled.
 * @reg_update: The boolean flag determines to clear the protection bits
 *              by regmap_update_bits with enable register(PROTECTEN) or
 *              by regmap_write with clear register(PROTECTEN_CLR).
 *
 * This function disables the bus protection bits previously enabled with
 * mtk_infracfg_set_bus_protection.
 */

int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask,
		bool reg_update)
{ … }

static int __init mtk_infracfg_init(void)
{ … }
postcore_initcall(mtk_infracfg_init);