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
unmask_msp_slp_irq(struct irq_data * d)23 static 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
mask_msp_slp_irq(struct irq_data * d)34 static 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 */
ack_msp_slp_irq(struct irq_data * d)49 static 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
60 static 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
msp_slp_irq_init(void)67 void __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
msp_slp_irq_dispatch(void)83 void 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 }
107