1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Freescale Semiconductor, Inc.
4 *
5 * Author: Varun Sethi <varun.sethi@freescale.com>
6 */
7
8#include <linux/irq.h>
9#include <linux/smp.h>
10#include <linux/interrupt.h>
11#include <linux/irqdomain.h>
12
13#include <asm/io.h>
14#include <asm/irq.h>
15#include <asm/mpic.h>
16
17#include "mpic.h"
18
19#define MPIC_ERR_INT_BASE 0x3900
20#define MPIC_ERR_INT_EISR 0x0000
21#define MPIC_ERR_INT_EIMR 0x0010
22
23static inline u32 mpic_fsl_err_read(u32 __iomem *base, unsigned int err_reg)
24{
25 return in_be32(base + (err_reg >> 2));
26}
27
28static inline void mpic_fsl_err_write(u32 __iomem *base, u32 value)
29{
30 out_be32(base + (MPIC_ERR_INT_EIMR >> 2), value);
31}
32
33static void fsl_mpic_mask_err(struct irq_data *d)
34{
35 u32 eimr;
36 struct mpic *mpic = irq_data_get_irq_chip_data(d);
37 unsigned int src = virq_to_hw(d->irq) - mpic->err_int_vecs[0];
38
39 eimr = mpic_fsl_err_read(base: mpic->err_regs, MPIC_ERR_INT_EIMR);
40 eimr |= (1 << (31 - src));
41 mpic_fsl_err_write(base: mpic->err_regs, value: eimr);
42}
43
44static void fsl_mpic_unmask_err(struct irq_data *d)
45{
46 u32 eimr;
47 struct mpic *mpic = irq_data_get_irq_chip_data(d);
48 unsigned int src = virq_to_hw(d->irq) - mpic->err_int_vecs[0];
49
50 eimr = mpic_fsl_err_read(base: mpic->err_regs, MPIC_ERR_INT_EIMR);
51 eimr &= ~(1 << (31 - src));
52 mpic_fsl_err_write(base: mpic->err_regs, value: eimr);
53}
54
55static struct irq_chip fsl_mpic_err_chip = {
56 .irq_disable = fsl_mpic_mask_err,
57 .irq_mask = fsl_mpic_mask_err,
58 .irq_unmask = fsl_mpic_unmask_err,
59};
60
61int __init mpic_setup_error_int(struct mpic *mpic, int intvec)
62{
63 int i;
64
65 mpic->err_regs = ioremap(offset: mpic->paddr + MPIC_ERR_INT_BASE, size: 0x1000);
66 if (!mpic->err_regs) {
67 pr_err("could not map mpic error registers\n");
68 return -ENOMEM;
69 }
70 mpic->hc_err = fsl_mpic_err_chip;
71 mpic->hc_err.name = mpic->name;
72 mpic->flags |= MPIC_FSL_HAS_EIMR;
73 /* allocate interrupt vectors for error interrupts */
74 for (i = MPIC_MAX_ERR - 1; i >= 0; i--)
75 mpic->err_int_vecs[i] = intvec--;
76
77 return 0;
78}
79
80int mpic_map_error_int(struct mpic *mpic, unsigned int virq, irq_hw_number_t hw)
81{
82 if ((mpic->flags & MPIC_FSL_HAS_EIMR) &&
83 (hw >= mpic->err_int_vecs[0] &&
84 hw <= mpic->err_int_vecs[MPIC_MAX_ERR - 1])) {
85 WARN_ON(mpic->flags & MPIC_SECONDARY);
86
87 pr_debug("mpic: mapping as Error Interrupt\n");
88 irq_set_chip_data(irq: virq, data: mpic);
89 irq_set_chip_and_handler(irq: virq, chip: &mpic->hc_err,
90 handle: handle_level_irq);
91 return 1;
92 }
93
94 return 0;
95}
96
97static irqreturn_t fsl_error_int_handler(int irq, void *data)
98{
99 struct mpic *mpic = (struct mpic *) data;
100 u32 eisr, eimr;
101 int errint;
102
103 eisr = mpic_fsl_err_read(base: mpic->err_regs, MPIC_ERR_INT_EISR);
104 eimr = mpic_fsl_err_read(base: mpic->err_regs, MPIC_ERR_INT_EIMR);
105
106 if (!(eisr & ~eimr))
107 return IRQ_NONE;
108
109 while (eisr) {
110 int ret;
111 errint = __builtin_clz(eisr);
112 ret = generic_handle_domain_irq(domain: mpic->irqhost,
113 hwirq: mpic->err_int_vecs[errint]);
114 if (WARN_ON(ret)) {
115 eimr |= 1 << (31 - errint);
116 mpic_fsl_err_write(base: mpic->err_regs, value: eimr);
117 }
118 eisr &= ~(1 << (31 - errint));
119 }
120
121 return IRQ_HANDLED;
122}
123
124void __init mpic_err_int_init(struct mpic *mpic, irq_hw_number_t irqnum)
125{
126 unsigned int virq;
127 int ret;
128
129 virq = irq_create_mapping(domain: mpic->irqhost, hwirq: irqnum);
130 if (!virq) {
131 pr_err("Error interrupt setup failed\n");
132 return;
133 }
134
135 /* Mask all error interrupts */
136 mpic_fsl_err_write(base: mpic->err_regs, value: ~0);
137
138 ret = request_irq(irq: virq, handler: fsl_error_int_handler, IRQF_NO_THREAD,
139 name: "mpic-error-int", dev: mpic);
140 if (ret)
141 pr_err("Failed to register error interrupt handler\n");
142}
143

source code of linux/arch/powerpc/sysdev/fsl_mpic_err.c