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fa6bd541d7
Aside with a set of the trigger-like resets Baikal-T1 CCU provides two additional blocks with directly controlled reset signals. In particular it concerns DDR full and initial resets and various PCIe sub-domains resets. Let's add the direct reset assertion/de-assertion of the corresponding flags support into the Baikal-T1 CCU driver then. It will be required at least for the PCIe platform driver. Obviously the DDR controller isn't supposed to be fully reset in the kernel, so the corresponding controls are added just for the sake of the interface implementation completeness. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Link: https://lore.kernel.org/r/20220929225402.9696-8-Sergey.Semin@baikalelectronics.ru Signed-off-by: Stephen Boyd <sboyd@kernel.org>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 BAIKAL ELECTRONICS, JSC
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*
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* Baikal-T1 CCU Resets interface driver
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*/
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#ifndef __CLK_BT1_CCU_RST_H__
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#define __CLK_BT1_CCU_RST_H__
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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struct ccu_rst_info;
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/*
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* enum ccu_rst_type - CCU Reset types
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* @CCU_RST_TRIG: Self-deasserted reset signal.
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* @CCU_RST_DIR: Directly controlled reset signal.
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*/
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enum ccu_rst_type {
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CCU_RST_TRIG,
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CCU_RST_DIR,
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};
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/*
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* struct ccu_rst_init_data - CCU Resets initialization data
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* @sys_regs: Baikal-T1 System Controller registers map.
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* @np: Pointer to the node with the System CCU block.
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*/
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struct ccu_rst_init_data {
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struct regmap *sys_regs;
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struct device_node *np;
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};
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/*
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* struct ccu_rst - CCU Reset descriptor
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* @rcdev: Reset controller descriptor.
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* @sys_regs: Baikal-T1 System Controller registers map.
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* @rsts_info: Reset flag info (base address and mask).
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*/
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struct ccu_rst {
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struct reset_controller_dev rcdev;
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struct regmap *sys_regs;
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const struct ccu_rst_info *rsts_info;
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};
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#define to_ccu_rst(_rcdev) container_of(_rcdev, struct ccu_rst, rcdev)
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#ifdef CONFIG_CLK_BT1_CCU_RST
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struct ccu_rst *ccu_rst_hw_register(const struct ccu_rst_init_data *init);
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void ccu_rst_hw_unregister(struct ccu_rst *rst);
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#else
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static inline
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struct ccu_rst *ccu_rst_hw_register(const struct ccu_rst_init_data *init)
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{
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return NULL;
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}
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static inline void ccu_rst_hw_unregister(struct ccu_rst *rst) {}
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#endif
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#endif /* __CLK_BT1_CCU_RST_H__ */
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