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