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785c02eb35
In some rare occasions, we want to only set the RETAIN_MEM bit, but not the RETAIN_PERIPH one: this is seen on at least SDM630/636/660's GPU-GX GDSC, where unsetting and setting back the RETAIN_PERIPH bit will generate chaos and panics during GPU suspend time (mainly, the chaos is unaligned access). For this reason, introduce a new NO_RET_PERIPH flag to the GDSC driver to address this corner case. Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org> Link: https://lore.kernel.org/r/20210113183817.447866-8-angelogioacchino.delregno@somainline.org Signed-off-by: Stephen Boyd <sboyd@kernel.org>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2015, 2017-2018, The Linux Foundation. All rights reserved.
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*/
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#ifndef __QCOM_GDSC_H__
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#define __QCOM_GDSC_H__
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#include <linux/err.h>
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#include <linux/pm_domain.h>
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struct regmap;
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struct regulator;
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struct reset_controller_dev;
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/**
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* struct gdsc - Globally Distributed Switch Controller
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* @pd: generic power domain
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* @regmap: regmap for MMIO accesses
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* @gdscr: gsdc control register
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* @gds_hw_ctrl: gds_hw_ctrl register
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* @cxcs: offsets of branch registers to toggle mem/periph bits in
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* @cxc_count: number of @cxcs
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* @pwrsts: Possible powerdomain power states
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* @resets: ids of resets associated with this gdsc
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* @reset_count: number of @resets
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* @rcdev: reset controller
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*/
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struct gdsc {
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struct generic_pm_domain pd;
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struct generic_pm_domain *parent;
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struct regmap *regmap;
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unsigned int gdscr;
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unsigned int gds_hw_ctrl;
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unsigned int clamp_io_ctrl;
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unsigned int *cxcs;
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unsigned int cxc_count;
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const u8 pwrsts;
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/* Powerdomain allowable state bitfields */
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#define PWRSTS_OFF BIT(0)
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#define PWRSTS_RET BIT(1)
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#define PWRSTS_ON BIT(2)
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#define PWRSTS_OFF_ON (PWRSTS_OFF | PWRSTS_ON)
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#define PWRSTS_RET_ON (PWRSTS_RET | PWRSTS_ON)
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const u16 flags;
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#define VOTABLE BIT(0)
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#define CLAMP_IO BIT(1)
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#define HW_CTRL BIT(2)
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#define SW_RESET BIT(3)
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#define AON_RESET BIT(4)
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#define POLL_CFG_GDSCR BIT(5)
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#define ALWAYS_ON BIT(6)
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#define RETAIN_FF_ENABLE BIT(7)
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#define NO_RET_PERIPH BIT(8)
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struct reset_controller_dev *rcdev;
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unsigned int *resets;
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unsigned int reset_count;
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const char *supply;
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struct regulator *rsupply;
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};
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struct gdsc_desc {
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struct device *dev;
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struct gdsc **scs;
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size_t num;
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};
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#ifdef CONFIG_QCOM_GDSC
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int gdsc_register(struct gdsc_desc *desc, struct reset_controller_dev *,
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struct regmap *);
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void gdsc_unregister(struct gdsc_desc *desc);
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int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain);
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#else
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static inline int gdsc_register(struct gdsc_desc *desc,
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struct reset_controller_dev *rcdev,
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struct regmap *r)
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{
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return -ENOSYS;
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}
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static inline void gdsc_unregister(struct gdsc_desc *desc) {};
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#endif /* CONFIG_QCOM_GDSC */
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#endif /* __QCOM_GDSC_H__ */
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