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
 24DEFINE_PER_CPU(unsigned long, irq_stack);
 25DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
 26EXPORT_PER_CPU_SYMBOL(irq_stat);
 27
 28struct acpi_vector_group pch_group[MAX_IO_PICS];
 29struct 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 */
 34void ack_bad_irq(unsigned int irq)
 35{
 36	pr_warn("Unexpected IRQ # %d\n", irq);
 37}
 38
 39atomic_t irq_err_count;
 40
 41asmlinkage void spurious_interrupt(void)
 42{
 43	atomic_inc(&irq_err_count);
 44}
 45
 46int 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(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 52	return 0;
 53}
 54
 55static int __init early_pci_mcfg_parse(struct acpi_table_header *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
 77static 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, early_pci_mcfg_parse);
 88}
 89
 90static int __init get_ipi_irq(void)
 91{
 92	struct irq_domain *d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
 93
 94	if (d)
 95		return irq_create_mapping(d, INT_IPI);
 96
 97	return -EINVAL;
 98}
 99
100void __init init_IRQ(void)
101{
102	int i;
103#ifdef CONFIG_SMP
104	int r, ipi_irq;
105	static int ipi_dummy_dev;
106#endif
107	unsigned int order = get_order(IRQ_STACK_SIZE);
108	struct page *page;
109
110	clear_csr_ecfg(ECFG0_IM);
111	clear_csr_estat(ESTATF_IP);
112
113	init_vec_parent_group();
114	irqchip_init();
115#ifdef CONFIG_SMP
116	ipi_irq = get_ipi_irq();
117	if (ipi_irq < 0)
118		panic("IPI IRQ mapping failed\n");
119	irq_set_percpu_devid(ipi_irq);
120	r = request_percpu_irq(ipi_irq, loongson_ipi_interrupt, "IPI", &ipi_dummy_dev);
121	if (r < 0)
122		panic("IPI IRQ request failed\n");
123#endif
124
125	for (i = 0; i < NR_IRQS; i++)
126		irq_set_noprobe(i);
127
128	for_each_possible_cpu(i) {
129		page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order);
130
131		per_cpu(irq_stack, i) = (unsigned long)page_address(page);
132		pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i,
133			per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE);
134	}
135
136	set_csr_ecfg(ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC);
137}