| /* |
| * Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@pengutronix.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/jiffies.h> |
| #include <linux/regmap.h> |
| #include <linux/soc/mediatek/infracfg.h> |
| #include <asm/processor.h> |
| |
| #define MTK_POLL_DELAY_US 10 |
| #define MTK_POLL_TIMEOUT (jiffies_to_usecs(HZ)) |
| |
| #define INFRA_TOPAXI_SI1_CTL 0x0204 |
| #define INFRA_TOPAXI_PROTECTEN 0x0220 |
| #define INFRA_TOPAXI_PROTECTSTA1 0x0228 |
| #define INFRA_TOPAXI_PROTECTEN_SET 0x0260 |
| #define INFRA_TOPAXI_PROTECTEN_CLR 0x0264 |
| |
| /** |
| * mtk_infracfg_set_axi_si1_way_en - enable AXI way_en |
| * @regmap: The infracfg regmap |
| * @mask: The mask containing the way_en bits to be enabled. |
| * |
| * This function enables the AXI way_en bits for enabled power |
| * domains so that registers on the power domain can be accessed. |
| */ |
| void mtk_infracfg_set_axi_si1_way_en(struct regmap *infracfg, u32 mask) |
| { |
| regmap_update_bits(infracfg, INFRA_TOPAXI_SI1_CTL, mask, mask); |
| } |
| |
| /** |
| * mtk_infracfg_clear_axi_si1_way_en - disable AXI way_en |
| * @regmap: The infracfg regmap |
| * @mask: The mask containing the way_en bits to be disabled. |
| * |
| * This function disables the AXI way_en bits previously enabled with |
| * mtk_infracfg_set_axi_si1_way_en, to prevent system hang while accessing |
| * registers. |
| */ |
| void mtk_infracfg_clear_axi_si1_way_en(struct regmap *infracfg, u32 mask) |
| { |
| regmap_update_bits(infracfg, INFRA_TOPAXI_SI1_CTL, mask, 0); |
| } |
| |
| /** |
| * mtk_infracfg_set_bus_protection - enable bus protection |
| * @regmap: 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) |
| { |
| u32 val; |
| int ret; |
| |
| if (reg_update) |
| regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, |
| mask); |
| else |
| regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_SET, mask); |
| |
| ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1, |
| val, (val & mask) == mask, |
| MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); |
| |
| return ret; |
| } |
| |
| /** |
| * mtk_infracfg_clear_bus_protection - disable bus protection |
| * @regmap: 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) |
| { |
| int ret; |
| u32 val; |
| |
| if (reg_update) |
| regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0); |
| else |
| regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_CLR, mask); |
| |
| ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1, |
| val, !(val & mask), |
| MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); |
| |
| return ret; |
| } |