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 */
ack_bad_irq(unsigned int irq)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
spurious_interrupt(void)41 asmlinkage void spurious_interrupt(void)
42 {
43 atomic_inc(&irq_err_count);
44 }
45
arch_show_interrupts(struct seq_file * p,int prec)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(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
52 return 0;
53 }
54
early_pci_mcfg_parse(struct acpi_table_header * header)55 static 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
init_vec_parent_group(void)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, early_pci_mcfg_parse);
88 }
89
get_ipi_irq(void)90 static 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
init_IRQ(void)100 void __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 }
138
