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74 lines
2.2 KiB
74 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015 Pengutronix, Sascha Hauer <[email protected]> |
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*/ |
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#include <linux/export.h> |
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#include <linux/jiffies.h> |
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#include <linux/regmap.h> |
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#include <linux/soc/mediatek/infracfg.h> |
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#include <asm/processor.h> |
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#define MTK_POLL_DELAY_US 10 |
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#define MTK_POLL_TIMEOUT (jiffies_to_usecs(HZ)) |
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/** |
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* mtk_infracfg_set_bus_protection - enable bus protection |
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* @infracfg: The infracfg regmap |
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* @mask: The mask containing the protection bits to be enabled. |
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* @reg_update: The boolean flag determines to set the protection bits |
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* by regmap_update_bits with enable register(PROTECTEN) or |
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* by regmap_write with set register(PROTECTEN_SET). |
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* |
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* This function enables the bus protection bits for disabled power |
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* domains so that the system does not hang when some unit accesses the |
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* bus while in power down. |
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*/ |
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int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask, |
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bool reg_update) |
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{ |
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u32 val; |
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int ret; |
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if (reg_update) |
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regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, |
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mask); |
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else |
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regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_SET, mask); |
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ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1, |
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val, (val & mask) == mask, |
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MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); |
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return ret; |
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} |
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/** |
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* mtk_infracfg_clear_bus_protection - disable bus protection |
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* @infracfg: The infracfg regmap |
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* @mask: The mask containing the protection bits to be disabled. |
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* @reg_update: The boolean flag determines to clear the protection bits |
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* by regmap_update_bits with enable register(PROTECTEN) or |
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* by regmap_write with clear register(PROTECTEN_CLR). |
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* |
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* This function disables the bus protection bits previously enabled with |
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* mtk_infracfg_set_bus_protection. |
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*/ |
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int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask, |
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bool reg_update) |
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{ |
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int ret; |
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u32 val; |
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if (reg_update) |
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regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0); |
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else |
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regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_CLR, mask); |
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ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1, |
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val, !(val & mask), |
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MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); |
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return ret; |
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}
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