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Based on 1 normalized pattern(s): 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 you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
158 lines
4.0 KiB
C
158 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2002 ARM Limited, All Rights Reserved.
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/irqchip/arm-gic.h>
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#include "irq-gic-common.h"
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static DEFINE_RAW_SPINLOCK(irq_controller_lock);
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static const struct gic_kvm_info *gic_kvm_info;
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const struct gic_kvm_info *gic_get_kvm_info(void)
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{
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return gic_kvm_info;
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}
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void gic_set_kvm_info(const struct gic_kvm_info *info)
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{
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BUG_ON(gic_kvm_info != NULL);
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gic_kvm_info = info;
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}
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void gic_enable_of_quirks(const struct device_node *np,
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const struct gic_quirk *quirks, void *data)
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{
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for (; quirks->desc; quirks++) {
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if (!of_device_is_compatible(np, quirks->compatible))
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continue;
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if (quirks->init(data))
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pr_info("GIC: enabling workaround for %s\n",
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quirks->desc);
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}
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}
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void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
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void *data)
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{
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for (; quirks->desc; quirks++) {
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if (quirks->iidr != (quirks->mask & iidr))
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continue;
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if (quirks->init(data))
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pr_info("GIC: enabling workaround for %s\n",
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quirks->desc);
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}
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}
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int gic_configure_irq(unsigned int irq, unsigned int type,
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void __iomem *base, void (*sync_access)(void))
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{
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u32 confmask = 0x2 << ((irq % 16) * 2);
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u32 confoff = (irq / 16) * 4;
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u32 val, oldval;
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int ret = 0;
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unsigned long flags;
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/*
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* Read current configuration register, and insert the config
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* for "irq", depending on "type".
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*/
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raw_spin_lock_irqsave(&irq_controller_lock, flags);
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val = oldval = readl_relaxed(base + GIC_DIST_CONFIG + confoff);
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if (type & IRQ_TYPE_LEVEL_MASK)
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val &= ~confmask;
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else if (type & IRQ_TYPE_EDGE_BOTH)
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val |= confmask;
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/* If the current configuration is the same, then we are done */
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if (val == oldval) {
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raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
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return 0;
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}
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/*
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* Write back the new configuration, and possibly re-enable
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* the interrupt. If we fail to write a new configuration for
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* an SPI then WARN and return an error. If we fail to write the
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* configuration for a PPI this is most likely because the GIC
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* does not allow us to set the configuration or we are in a
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* non-secure mode, and hence it may not be catastrophic.
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*/
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writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
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if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val) {
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if (WARN_ON(irq >= 32))
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ret = -EINVAL;
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else
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pr_warn("GIC: PPI%d is secure or misconfigured\n",
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irq - 16);
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}
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raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
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if (sync_access)
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sync_access();
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return ret;
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}
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void gic_dist_config(void __iomem *base, int gic_irqs,
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void (*sync_access)(void))
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{
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unsigned int i;
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/*
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* Set all global interrupts to be level triggered, active low.
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*/
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for (i = 32; i < gic_irqs; i += 16)
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writel_relaxed(GICD_INT_ACTLOW_LVLTRIG,
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base + GIC_DIST_CONFIG + i / 4);
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/*
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* Set priority on all global interrupts.
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*/
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for (i = 32; i < gic_irqs; i += 4)
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writel_relaxed(GICD_INT_DEF_PRI_X4, base + GIC_DIST_PRI + i);
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/*
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* Deactivate and disable all SPIs. Leave the PPI and SGIs
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* alone as they are in the redistributor registers on GICv3.
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*/
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for (i = 32; i < gic_irqs; i += 32) {
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writel_relaxed(GICD_INT_EN_CLR_X32,
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base + GIC_DIST_ACTIVE_CLEAR + i / 8);
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writel_relaxed(GICD_INT_EN_CLR_X32,
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base + GIC_DIST_ENABLE_CLEAR + i / 8);
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}
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if (sync_access)
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sync_access();
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}
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void gic_cpu_config(void __iomem *base, void (*sync_access)(void))
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{
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int i;
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/*
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* Deal with the banked PPI and SGI interrupts - disable all
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* PPI interrupts, ensure all SGI interrupts are enabled.
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* Make sure everything is deactivated.
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*/
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writel_relaxed(GICD_INT_EN_CLR_X32, base + GIC_DIST_ACTIVE_CLEAR);
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writel_relaxed(GICD_INT_EN_CLR_PPI, base + GIC_DIST_ENABLE_CLEAR);
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writel_relaxed(GICD_INT_EN_SET_SGI, base + GIC_DIST_ENABLE_SET);
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/*
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* Set priority on PPI and SGI interrupts
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*/
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for (i = 0; i < 32; i += 4)
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writel_relaxed(GICD_INT_DEF_PRI_X4,
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base + GIC_DIST_PRI + i * 4 / 4);
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if (sync_access)
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sync_access();
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}
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