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
unmask_msp_slp_irq(struct irq_data * d)19 static 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
mask_msp_slp_irq(struct irq_data * d)30 static 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 */
ack_msp_slp_irq(struct irq_data * d)45 static 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
56 static 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
msp_slp_irq_init(void)63 void __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
msp_slp_irq_dispatch(void)79 void 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 }
103