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/minmax.h> 15 #include <linux/mm.h> 16 #include <linux/sched.h> 17 #include <linux/seq_file.h> 18 #include <linux/kallsyms.h> 19 #include <linux/uaccess.h> 20 21 #include <asm/irq.h> 22 #include <asm/loongson.h> 23 #include <asm/setup.h> 24 25 DEFINE_PER_CPU(unsigned long, irq_stack); 26 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); 27 EXPORT_PER_CPU_SYMBOL(irq_stat); 28 29 struct acpi_vector_group pch_group[MAX_IO_PICS]; 30 struct acpi_vector_group msi_group[MAX_IO_PICS]; 31 /* 32 * 'what should we do if we get a hw irq event on an illegal vector'. 33 * each architecture has to answer this themselves. 34 */ 35 void ack_bad_irq(unsigned int irq) 36 { 37 pr_warn("Unexpected IRQ # %d\n", irq); 38 } 39 40 atomic_t irq_err_count; 41 42 asmlinkage void spurious_interrupt(void) 43 { 44 atomic_inc(&irq_err_count); 45 } 46 47 int arch_show_interrupts(struct seq_file *p, int prec) 48 { 49 #ifdef CONFIG_SMP 50 show_ipi_list(p, prec); 51 #endif 52 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); 53 return 0; 54 } 55 56 static int __init early_pci_mcfg_parse(struct acpi_table_header *header) 57 { 58 struct acpi_table_mcfg *mcfg; 59 struct acpi_mcfg_allocation *mptr; 60 int i, n; 61 62 if (header->length < sizeof(struct acpi_table_mcfg)) 63 return -EINVAL; 64 65 n = (header->length - sizeof(struct acpi_table_mcfg)) / 66 sizeof(struct acpi_mcfg_allocation); 67 mcfg = (struct acpi_table_mcfg *)header; 68 mptr = (struct acpi_mcfg_allocation *) &mcfg[1]; 69 70 for (i = 0; i < n; i++, mptr++) { 71 msi_group[i].pci_segment = mptr->pci_segment; 72 pch_group[i].node = msi_group[i].node = (mptr->address >> 44) & 0xf; 73 } 74 75 return 0; 76 } 77 78 static void __init init_vec_parent_group(void) 79 { 80 int i; 81 82 for (i = 0; i < MAX_IO_PICS; i++) { 83 msi_group[i].pci_segment = -1; 84 msi_group[i].node = -1; 85 pch_group[i].node = -1; 86 } 87 88 acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse); 89 } 90 91 int __init arch_probe_nr_irqs(void) 92 { 93 int nr_io_pics = bitmap_weight(loongson_sysconf.cores_io_master, NR_CPUS); 94 95 if (!cpu_has_avecint) 96 irq_set_nr_irqs(64 + NR_VECTORS * nr_io_pics); 97 else 98 irq_set_nr_irqs(64 + NR_VECTORS * (nr_cpu_ids + nr_io_pics)); 99 100 return NR_IRQS_LEGACY; 101 } 102 103 unsigned int arch_dynirq_lower_bound(unsigned int from) 104 { 105 return MAX(from, NR_IRQS_LEGACY); 106 } 107 108 void __init init_IRQ(void) 109 { 110 int i; 111 unsigned int order = get_order(IRQ_STACK_SIZE); 112 struct page *page; 113 114 clear_csr_ecfg(ECFG0_IM); 115 clear_csr_estat(ESTATF_IP); 116 117 init_vec_parent_group(); 118 irqchip_init(); 119 #ifdef CONFIG_SMP 120 mp_ops.init_ipi(); 121 #endif 122 123 for_each_possible_cpu(i) { 124 page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order); 125 126 per_cpu(irq_stack, i) = (unsigned long)page_address(page); 127 pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i, 128 per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE); 129 } 130 131 set_csr_ecfg(ECFGF_SIP0 | ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC); 132 } 133