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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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95a8ddde36
The APLIC states might be reset when the platform enters a low power state, but the register states are not being preserved and restored, which prevents interrupt delivery after the platform resumes. Solve this by adding a syscore ops and a power management notifier to preserve and restore the APLIC states on suspend and resume. [ tglx: Folded the build fix provided by Geert ] Signed-off-by: Nick Hu <nick.hu@sifive.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Yong-Xuan Wang <yongxuan.wang@sifive.com> Reviewed-by: Cyan Yang <cyan.yang@sifive.com> Reviewed-by: Nutty Liu <liujingqi@lanxincomputing.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://patch.msgid.link/20251202-preserve-aplic-imsic-v3-2-1844fbf1fe92@sifive.com
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 Western Digital Corporation or its affiliates.
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* Copyright (C) 2022 Ventana Micro Systems Inc.
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*/
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#ifndef _IRQ_RISCV_APLIC_MAIN_H
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#define _IRQ_RISCV_APLIC_MAIN_H
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/fwnode.h>
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#define APLIC_DEFAULT_PRIORITY 1
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struct aplic_msicfg {
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phys_addr_t base_ppn;
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u32 hhxs;
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u32 hhxw;
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u32 lhxs;
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u32 lhxw;
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};
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struct aplic_src_ctrl {
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u32 sourcecfg;
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u32 target;
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u32 ie;
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};
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struct aplic_saved_regs {
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u32 domaincfg;
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#ifdef CONFIG_RISCV_M_MODE
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u32 msiaddr;
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u32 msiaddrh;
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#endif
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struct aplic_src_ctrl *srcs;
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};
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struct aplic_priv {
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struct list_head head;
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struct notifier_block genpd_nb;
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struct aplic_saved_regs saved_hw_regs;
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struct device *dev;
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u32 gsi_base;
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u32 nr_irqs;
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u32 nr_idcs;
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u32 acpi_aplic_id;
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void __iomem *regs;
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struct aplic_msicfg msicfg;
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};
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void aplic_irq_unmask(struct irq_data *d);
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void aplic_irq_mask(struct irq_data *d);
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int aplic_irq_set_type(struct irq_data *d, unsigned int type);
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int aplic_irqdomain_translate(struct irq_fwspec *fwspec, u32 gsi_base,
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unsigned long *hwirq, unsigned int *type);
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void aplic_init_hw_global(struct aplic_priv *priv, bool msi_mode);
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int aplic_setup_priv(struct aplic_priv *priv, struct device *dev, void __iomem *regs);
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void aplic_direct_restore_states(struct aplic_priv *priv);
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int aplic_direct_setup(struct device *dev, void __iomem *regs);
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#ifdef CONFIG_RISCV_APLIC_MSI
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int aplic_msi_setup(struct device *dev, void __iomem *regs);
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#else
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static inline int aplic_msi_setup(struct device *dev, void __iomem *regs)
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{
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return -ENODEV;
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}
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#endif
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#endif
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