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 26 struct irq_domain *cpu_domain; 27 struct irq_domain *liointc_domain; 28 struct irq_domain *pch_lpc_domain; 29 struct irq_domain *pch_msi_domain[MAX_IO_PICS]; 30 struct irq_domain *pch_pic_domain[MAX_IO_PICS]; 31 32 /* 33 * 'what should we do if we get a hw irq event on an illegal vector'. 34 * each architecture has to answer this themselves. 35 */ 36 void ack_bad_irq(unsigned int irq) 37 { 38 pr_warn("Unexpected IRQ # %d\n", irq); 39 } 40 41 atomic_t irq_err_count; 42 43 asmlinkage void spurious_interrupt(void) 44 { 45 atomic_inc(&irq_err_count); 46 } 47 48 int arch_show_interrupts(struct seq_file *p, int prec) 49 { 50 #ifdef CONFIG_SMP 51 show_ipi_list(p, prec); 52 #endif 53 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); 54 return 0; 55 } 56 57 void __init init_IRQ(void) 58 { 59 int i, r, ipi_irq; 60 static int ipi_dummy_dev; 61 unsigned int order = get_order(IRQ_STACK_SIZE); 62 struct page *page; 63 64 clear_csr_ecfg(ECFG0_IM); 65 clear_csr_estat(ESTATF_IP); 66 67 irqchip_init(); 68 #ifdef CONFIG_SMP 69 ipi_irq = EXCCODE_IPI - EXCCODE_INT_START; 70 irq_set_percpu_devid(ipi_irq); 71 r = request_percpu_irq(ipi_irq, loongson3_ipi_interrupt, "IPI", &ipi_dummy_dev); 72 if (r < 0) 73 panic("IPI IRQ request failed\n"); 74 #endif 75 76 for (i = 0; i < NR_IRQS; i++) 77 irq_set_noprobe(i); 78 79 for_each_possible_cpu(i) { 80 page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order); 81 82 per_cpu(irq_stack, i) = (unsigned long)page_address(page); 83 pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i, 84 per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE); 85 } 86 87 set_csr_ecfg(ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC); 88 } 89