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 <soc/tegra/irq.h> 22 23 #include "board.h" 24 #include "iomap.h" 25 26 #define SGI_MASK 0xFFFF 27 28 #ifdef CONFIG_PM_SLEEP 29 static void __iomem *tegra_gic_cpu_base; 30 #endif 31 32 bool tegra_pending_sgi(void) 33 { 34 u32 pending_set; 35 void __iomem *distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE); 36 37 pending_set = readl_relaxed(distbase + GIC_DIST_PENDING_SET); 38 39 if (pending_set & SGI_MASK) 40 return true; 41 42 return false; 43 } 44 45 #ifdef CONFIG_PM_SLEEP 46 static int tegra_gic_notifier(struct notifier_block *self, 47 unsigned long cmd, void *v) 48 { 49 switch (cmd) { 50 case CPU_PM_ENTER: 51 writel_relaxed(0x1E0, tegra_gic_cpu_base + GIC_CPU_CTRL); 52 break; 53 } 54 55 return NOTIFY_OK; 56 } 57 58 static struct notifier_block tegra_gic_notifier_block = { 59 .notifier_call = tegra_gic_notifier, 60 }; 61 62 static const struct of_device_id tegra114_dt_gic_match[] __initconst = { 63 { .compatible = "arm,cortex-a15-gic" }, 64 { } 65 }; 66 67 static void __init tegra114_gic_cpu_pm_registration(void) 68 { 69 struct device_node *dn; 70 71 dn = of_find_matching_node(NULL, tegra114_dt_gic_match); 72 if (!dn) 73 return; 74 75 tegra_gic_cpu_base = of_iomap(dn, 1); 76 77 cpu_pm_register_notifier(&tegra_gic_notifier_block); 78 } 79 #else 80 static void __init tegra114_gic_cpu_pm_registration(void) { } 81 #endif 82 83 static const struct of_device_id tegra_ictlr_match[] __initconst = { 84 { .compatible = "nvidia,tegra20-ictlr" }, 85 { .compatible = "nvidia,tegra30-ictlr" }, 86 { } 87 }; 88 89 void __init tegra_init_irq(void) 90 { 91 if (WARN_ON(!of_find_matching_node(NULL, tegra_ictlr_match))) 92 pr_warn("Outdated DT detected, suspend/resume will NOT work\n"); 93 94 tegra114_gic_cpu_pm_registration(); 95 } 96