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1/*
2 * This file define the irq handler for MSP SLM subsystem interrupts.
3 *
4 * Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c
5 * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/kernel.h>
16#include <linux/bitops.h>
17
18#include <asm/mipsregs.h>
19
20#include <msp_slp_int.h>
21#include <msp_regs.h>
22
23static inline void unmask_msp_slp_irq(struct irq_data *d)
24{
25 unsigned int irq = d->irq;
26
27 /* check for PER interrupt range */
28 if (irq < MSP_PER_INTBASE)
29 *SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE));
30 else
31 *PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE));
32}
33
34static inline void mask_msp_slp_irq(struct irq_data *d)
35{
36 unsigned int irq = d->irq;
37
38 /* check for PER interrupt range */
39 if (irq < MSP_PER_INTBASE)
40 *SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE));
41 else
42 *PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE));
43}
44
45/*
46 * While we ack the interrupt interrupts are disabled and thus we don't need
47 * to deal with concurrency issues. Same for msp_slp_irq_end.
48 */
49static inline void ack_msp_slp_irq(struct irq_data *d)
50{
51 unsigned int irq = d->irq;
52
53 /* check for PER interrupt range */
54 if (irq < MSP_PER_INTBASE)
55 *SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE));
56 else
57 *PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE));
58}
59
60static struct irq_chip msp_slp_irq_controller = {
61 .name = "MSP_SLP",
62 .irq_ack = ack_msp_slp_irq,
63 .irq_mask = mask_msp_slp_irq,
64 .irq_unmask = unmask_msp_slp_irq,
65};
66
67void __init msp_slp_irq_init(void)
68{
69 int i;
70
71 /* Mask/clear interrupts. */
72 *SLP_INT_MSK_REG = 0x00000000;
73 *PER_INT_MSK_REG = 0x00000000;
74 *SLP_INT_STS_REG = 0xFFFFFFFF;
75 *PER_INT_STS_REG = 0xFFFFFFFF;
76
77 /* initialize all the IRQ descriptors */
78 for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++)
79 irq_set_chip_and_handler(i, &msp_slp_irq_controller,
80 handle_level_irq);
81}
82
83void msp_slp_irq_dispatch(void)
84{
85 u32 pending;
86 int intbase;
87
88 intbase = MSP_SLP_INTBASE;
89 pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG;
90
91 /* check for PER interrupt */
92 if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) {
93 intbase = MSP_PER_INTBASE;
94 pending = *PER_INT_STS_REG & *PER_INT_MSK_REG;
95 }
96
97 /* check for spurious interrupt */
98 if (pending == 0x00000000) {
99 printk(KERN_ERR "Spurious %s interrupt?\n",
100 (intbase == MSP_SLP_INTBASE) ? "SLP" : "PER");
101 return;
102 }
103
104 /* dispatch the irq */
105 do_IRQ(ffs(pending) + intbase - 1);
106}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * This file define the irq handler for MSP SLM subsystem interrupts.
4 *
5 * Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c
6 * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com
7 */
8
9#include <linux/init.h>
10#include <linux/interrupt.h>
11#include <linux/kernel.h>
12#include <linux/bitops.h>
13
14#include <asm/mipsregs.h>
15
16#include <msp_slp_int.h>
17#include <msp_regs.h>
18
19static inline void unmask_msp_slp_irq(struct irq_data *d)
20{
21 unsigned int irq = d->irq;
22
23 /* check for PER interrupt range */
24 if (irq < MSP_PER_INTBASE)
25 *SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE));
26 else
27 *PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE));
28}
29
30static inline void mask_msp_slp_irq(struct irq_data *d)
31{
32 unsigned int irq = d->irq;
33
34 /* check for PER interrupt range */
35 if (irq < MSP_PER_INTBASE)
36 *SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE));
37 else
38 *PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE));
39}
40
41/*
42 * While we ack the interrupt interrupts are disabled and thus we don't need
43 * to deal with concurrency issues. Same for msp_slp_irq_end.
44 */
45static inline void ack_msp_slp_irq(struct irq_data *d)
46{
47 unsigned int irq = d->irq;
48
49 /* check for PER interrupt range */
50 if (irq < MSP_PER_INTBASE)
51 *SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE));
52 else
53 *PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE));
54}
55
56static struct irq_chip msp_slp_irq_controller = {
57 .name = "MSP_SLP",
58 .irq_ack = ack_msp_slp_irq,
59 .irq_mask = mask_msp_slp_irq,
60 .irq_unmask = unmask_msp_slp_irq,
61};
62
63void __init msp_slp_irq_init(void)
64{
65 int i;
66
67 /* Mask/clear interrupts. */
68 *SLP_INT_MSK_REG = 0x00000000;
69 *PER_INT_MSK_REG = 0x00000000;
70 *SLP_INT_STS_REG = 0xFFFFFFFF;
71 *PER_INT_STS_REG = 0xFFFFFFFF;
72
73 /* initialize all the IRQ descriptors */
74 for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++)
75 irq_set_chip_and_handler(i, &msp_slp_irq_controller,
76 handle_level_irq);
77}
78
79void msp_slp_irq_dispatch(void)
80{
81 u32 pending;
82 int intbase;
83
84 intbase = MSP_SLP_INTBASE;
85 pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG;
86
87 /* check for PER interrupt */
88 if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) {
89 intbase = MSP_PER_INTBASE;
90 pending = *PER_INT_STS_REG & *PER_INT_MSK_REG;
91 }
92
93 /* check for spurious interrupt */
94 if (pending == 0x00000000) {
95 printk(KERN_ERR "Spurious %s interrupt?\n",
96 (intbase == MSP_SLP_INTBASE) ? "SLP" : "PER");
97 return;
98 }
99
100 /* dispatch the irq */
101 do_IRQ(ffs(pending) + intbase - 1);
102}