1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #include <linux/kernel.h> 6 #include <linux/acpi.h> 7 #include <linux/atomic.h> 8 #include <linux/delay.h> 9 #include <linux/init.h> 10 #include <linux/interrupt.h> 11 #include <linux/irqchip.h> 12 #include <linux/kernel_stat.h> 13 #include <linux/proc_fs.h> 14 #include <linux/mm.h> 15 #include <linux/sched.h> 16 #include <linux/seq_file.h> 17 #include <linux/kallsyms.h> 18 #include <linux/uaccess.h> 19 20 #include <asm/irq.h> 21 #include <asm/loongson.h> 22 #include <asm/setup.h> 23 24 DEFINE_PER_CPU(unsigned long, irq_stack); 25 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); 26 EXPORT_PER_CPU_SYMBOL(irq_stat); 27 28 struct irq_domain *cpu_domain; 29 struct irq_domain *liointc_domain; 30 struct irq_domain *pch_lpc_domain; 31 struct irq_domain *pch_msi_domain[MAX_IO_PICS]; 32 struct irq_domain *pch_pic_domain[MAX_IO_PICS]; 33 34 /* 35 * 'what should we do if we get a hw irq event on an illegal vector'. 36 * each architecture has to answer this themselves. 37 */ 38 void ack_bad_irq(unsigned int irq) 39 { 40 pr_warn("Unexpected IRQ # %d\n", irq); 41 } 42 43 atomic_t irq_err_count; 44 45 asmlinkage void spurious_interrupt(void) 46 { 47 atomic_inc(&irq_err_count); 48 } 49 50 int arch_show_interrupts(struct seq_file *p, int prec) 51 { 52 #ifdef CONFIG_SMP 53 show_ipi_list(p, prec); 54 #endif 55 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); 56 return 0; 57 } 58 59 void __init init_IRQ(void) 60 { 61 int i; 62 #ifdef CONFIG_SMP 63 int r, ipi_irq; 64 static int ipi_dummy_dev; 65 #endif 66 unsigned int order = get_order(IRQ_STACK_SIZE); 67 struct page *page; 68 69 clear_csr_ecfg(ECFG0_IM); 70 clear_csr_estat(ESTATF_IP); 71 72 irqchip_init(); 73 #ifdef CONFIG_SMP 74 ipi_irq = EXCCODE_IPI - EXCCODE_INT_START; 75 irq_set_percpu_devid(ipi_irq); 76 r = request_percpu_irq(ipi_irq, loongson3_ipi_interrupt, "IPI", &ipi_dummy_dev); 77 if (r < 0) 78 panic("IPI IRQ request failed\n"); 79 #endif 80 81 for (i = 0; i < NR_IRQS; i++) 82 irq_set_noprobe(i); 83 84 for_each_possible_cpu(i) { 85 page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order); 86 87 per_cpu(irq_stack, i) = (unsigned long)page_address(page); 88 pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i, 89 per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE); 90 } 91 92 set_csr_ecfg(ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC); 93 } 94