| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
| */ |
| #include <linux/kernel.h> |
| #include <linux/acpi.h> |
| #include <linux/atomic.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/irqchip.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/proc_fs.h> |
| #include <linux/mm.h> |
| #include <linux/sched.h> |
| #include <linux/seq_file.h> |
| #include <linux/kallsyms.h> |
| #include <linux/uaccess.h> |
| |
| #include <asm/irq.h> |
| #include <asm/loongson.h> |
| #include <asm/setup.h> |
| |
| DEFINE_PER_CPU(unsigned long, irq_stack); |
| DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); |
| EXPORT_PER_CPU_SYMBOL(irq_stat); |
| |
| struct acpi_vector_group pch_group[MAX_IO_PICS]; |
| struct acpi_vector_group msi_group[MAX_IO_PICS]; |
| /* |
| * 'what should we do if we get a hw irq event on an illegal vector'. |
| * each architecture has to answer this themselves. |
| */ |
| void ack_bad_irq(unsigned int irq) |
| { |
| pr_warn("Unexpected IRQ # %d\n", irq); |
| } |
| |
| atomic_t irq_err_count; |
| |
| asmlinkage void spurious_interrupt(void) |
| { |
| atomic_inc(&irq_err_count); |
| } |
| |
| int arch_show_interrupts(struct seq_file *p, int prec) |
| { |
| #ifdef CONFIG_SMP |
| show_ipi_list(p, prec); |
| #endif |
| seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); |
| return 0; |
| } |
| |
| static int __init early_pci_mcfg_parse(struct acpi_table_header *header) |
| { |
| struct acpi_table_mcfg *mcfg; |
| struct acpi_mcfg_allocation *mptr; |
| int i, n; |
| |
| if (header->length < sizeof(struct acpi_table_mcfg)) |
| return -EINVAL; |
| |
| n = (header->length - sizeof(struct acpi_table_mcfg)) / |
| sizeof(struct acpi_mcfg_allocation); |
| mcfg = (struct acpi_table_mcfg *)header; |
| mptr = (struct acpi_mcfg_allocation *) &mcfg[1]; |
| |
| for (i = 0; i < n; i++, mptr++) { |
| msi_group[i].pci_segment = mptr->pci_segment; |
| pch_group[i].node = msi_group[i].node = (mptr->address >> 44) & 0xf; |
| } |
| |
| return 0; |
| } |
| |
| static void __init init_vec_parent_group(void) |
| { |
| int i; |
| |
| for (i = 0; i < MAX_IO_PICS; i++) { |
| msi_group[i].pci_segment = -1; |
| msi_group[i].node = -1; |
| pch_group[i].node = -1; |
| } |
| |
| acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse); |
| } |
| |
| static int __init get_ipi_irq(void) |
| { |
| struct irq_domain *d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY); |
| |
| if (d) |
| return irq_create_mapping(d, EXCCODE_IPI - EXCCODE_INT_START); |
| |
| return -EINVAL; |
| } |
| |
| void __init init_IRQ(void) |
| { |
| int i; |
| #ifdef CONFIG_SMP |
| int r, ipi_irq; |
| static int ipi_dummy_dev; |
| #endif |
| unsigned int order = get_order(IRQ_STACK_SIZE); |
| struct page *page; |
| |
| clear_csr_ecfg(ECFG0_IM); |
| clear_csr_estat(ESTATF_IP); |
| |
| init_vec_parent_group(); |
| irqchip_init(); |
| #ifdef CONFIG_SMP |
| ipi_irq = get_ipi_irq(); |
| if (ipi_irq < 0) |
| panic("IPI IRQ mapping failed\n"); |
| irq_set_percpu_devid(ipi_irq); |
| r = request_percpu_irq(ipi_irq, loongson3_ipi_interrupt, "IPI", &ipi_dummy_dev); |
| if (r < 0) |
| panic("IPI IRQ request failed\n"); |
| #endif |
| |
| for (i = 0; i < NR_IRQS; i++) |
| irq_set_noprobe(i); |
| |
| for_each_possible_cpu(i) { |
| page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order); |
| |
| per_cpu(irq_stack, i) = (unsigned long)page_address(page); |
| pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i, |
| per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE); |
| } |
| |
| set_csr_ecfg(ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC); |
| } |