1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011 Google, Inc. 4 * 5 * Author: 6 * Colin Cross <ccross@android.com> 7 * 8 * Copyright (C) 2010,2013, NVIDIA Corporation 9 */ 10 11 #include <linux/cpu_pm.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/irqchip/arm-gic.h> 15 #include <linux/irq.h> 16 #include <linux/kernel.h> 17 #include <linux/of_address.h> 18 #include <linux/of.h> 19 #include <linux/syscore_ops.h> 20 21 #include "board.h" 22 #include "iomap.h" 23 #include "irq.h" 24 25 #define SGI_MASK 0xFFFF 26 27 #ifdef CONFIG_PM_SLEEP 28 static void __iomem *tegra_gic_cpu_base; 29 #endif 30 31 bool tegra_pending_sgi(void) 32 { 33 u32 pending_set; 34 void __iomem *distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE); 35 36 pending_set = readl_relaxed(distbase + GIC_DIST_PENDING_SET); 37 38 if (pending_set & SGI_MASK) 39 return true; 40 41 return false; 42 } 43 44 #ifdef CONFIG_PM_SLEEP 45 static int tegra_gic_notifier(struct notifier_block *self, 46 unsigned long cmd, void *v) 47 { 48 switch (cmd) { 49 case CPU_PM_ENTER: 50 writel_relaxed(0x1E0, tegra_gic_cpu_base + GIC_CPU_CTRL); 51 break; 52 } 53 54 return NOTIFY_OK; 55 } 56 57 static struct notifier_block tegra_gic_notifier_block = { 58 .notifier_call = tegra_gic_notifier, 59 }; 60 61 static const struct of_device_id tegra114_dt_gic_match[] __initconst = { 62 { .compatible = "arm,cortex-a15-gic" }, 63 { } 64 }; 65 66 static void __init tegra114_gic_cpu_pm_registration(void) 67 { 68 struct device_node *dn; 69 70 dn = of_find_matching_node(NULL, tegra114_dt_gic_match); 71 if (!dn) 72 return; 73 74 tegra_gic_cpu_base = of_iomap(dn, 1); 75 76 cpu_pm_register_notifier(&tegra_gic_notifier_block); 77 } 78 #else 79 static void __init tegra114_gic_cpu_pm_registration(void) { } 80 #endif 81 82 static const struct of_device_id tegra_ictlr_match[] __initconst = { 83 { .compatible = "nvidia,tegra20-ictlr" }, 84 { .compatible = "nvidia,tegra30-ictlr" }, 85 { } 86 }; 87 88 void __init tegra_init_irq(void) 89 { 90 if (WARN_ON(!of_find_matching_node(NULL, tegra_ictlr_match))) 91 pr_warn("Outdated DT detected, suspend/resume will NOT work\n"); 92 93 tegra114_gic_cpu_pm_registration(); 94 } 95