1/*
 2 * arch/sh/kernel/cpu/irq/imask.c
 3 *
 4 * Copyright (C) 1999, 2000  Niibe Yutaka
 5 *
 6 * Simple interrupt handling using IMASK of SR register.
 7 *
 8 */
 9/* NOTE: Will not work on level 15 */
10#include <linux/ptrace.h>
11#include <linux/errno.h>
12#include <linux/kernel_stat.h>
13#include <linux/signal.h>
14#include <linux/sched.h>
15#include <linux/interrupt.h>
16#include <linux/init.h>
17#include <linux/bitops.h>
18#include <linux/spinlock.h>
19#include <linux/cache.h>
20#include <linux/irq.h>
21#include <linux/bitmap.h>
22#include <asm/irq.h>
23
24/* Bitmap of IRQ masked */
25#define IMASK_PRIORITY	15
26
27static DECLARE_BITMAP(imask_mask, IMASK_PRIORITY);
28static int interrupt_priority;
29
30static inline void set_interrupt_registers(int ip)
31{
32	unsigned long __dummy;
33
34	asm volatile(
35#ifdef CONFIG_CPU_HAS_SR_RB
36		     "ldc	%2, r6_bank\n\t"
37#endif
38		     "stc	sr, %0\n\t"
39		     "and	#0xf0, %0\n\t"
40		     "shlr2	%0\n\t"
41		     "cmp/eq	#0x3c, %0\n\t"
42		     "bt/s	1f	! CLI-ed\n\t"
43		     " stc	sr, %0\n\t"
44		     "and	%1, %0\n\t"
45		     "or	%2, %0\n\t"
46		     "ldc	%0, sr\n"
47		     "1:"
48		     : "=&z" (__dummy)
49		     : "r" (~0xf0), "r" (ip << 4)
50		     : "t");
51}
52
53static void mask_imask_irq(struct irq_data *data)
54{
55	unsigned int irq = data->irq;
56
57	clear_bit(irq, imask_mask);
58	if (interrupt_priority < IMASK_PRIORITY - irq)
59		interrupt_priority = IMASK_PRIORITY - irq;
60	set_interrupt_registers(interrupt_priority);
61}
62
63static void unmask_imask_irq(struct irq_data *data)
64{
65	unsigned int irq = data->irq;
66
67	set_bit(irq, imask_mask);
68	interrupt_priority = IMASK_PRIORITY -
69		find_first_zero_bit(imask_mask, IMASK_PRIORITY);
70	set_interrupt_registers(interrupt_priority);
71}
72
73static struct irq_chip imask_irq_chip = {
74	.name		= "SR.IMASK",
75	.irq_mask	= mask_imask_irq,
76	.irq_unmask	= unmask_imask_irq,
77	.irq_mask_ack	= mask_imask_irq,
78};
79
80void make_imask_irq(unsigned int irq)
81{
82	irq_set_chip_and_handler_name(irq, &imask_irq_chip, handle_level_irq,
83				      "level");
84}

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * arch/sh/kernel/cpu/irq/imask.c
 4 *
 5 * Copyright (C) 1999, 2000  Niibe Yutaka
 6 *
 7 * Simple interrupt handling using IMASK of SR register.
 8 *
 9 */
10/* NOTE: Will not work on level 15 */
11#include <linux/ptrace.h>
12#include <linux/errno.h>
13#include <linux/kernel_stat.h>
14#include <linux/signal.h>
15#include <linux/sched.h>
16#include <linux/interrupt.h>
17#include <linux/init.h>
18#include <linux/bitops.h>
19#include <linux/spinlock.h>
20#include <linux/cache.h>
21#include <linux/irq.h>
22#include <linux/bitmap.h>
23#include <asm/irq.h>
24
25/* Bitmap of IRQ masked */
26#define IMASK_PRIORITY	15
27
28static DECLARE_BITMAP(imask_mask, IMASK_PRIORITY);
29static int interrupt_priority;
30
31static inline void set_interrupt_registers(int ip)
32{
33	unsigned long __dummy;
34
35	asm volatile(
36#ifdef CONFIG_CPU_HAS_SR_RB
37		     "ldc	%2, r6_bank\n\t"
38#endif
39		     "stc	sr, %0\n\t"
40		     "and	#0xf0, %0\n\t"
41		     "shlr2	%0\n\t"
42		     "cmp/eq	#0x3c, %0\n\t"
43		     "bt/s	1f	! CLI-ed\n\t"
44		     " stc	sr, %0\n\t"
45		     "and	%1, %0\n\t"
46		     "or	%2, %0\n\t"
47		     "ldc	%0, sr\n"
48		     "1:"
49		     : "=&z" (__dummy)
50		     : "r" (~0xf0), "r" (ip << 4)
51		     : "t");
52}
53
54static void mask_imask_irq(struct irq_data *data)
55{
56	unsigned int irq = data->irq;
57
58	clear_bit(irq, imask_mask);
59	if (interrupt_priority < IMASK_PRIORITY - irq)
60		interrupt_priority = IMASK_PRIORITY - irq;
61	set_interrupt_registers(interrupt_priority);
62}
63
64static void unmask_imask_irq(struct irq_data *data)
65{
66	unsigned int irq = data->irq;
67
68	set_bit(irq, imask_mask);
69	interrupt_priority = IMASK_PRIORITY -
70		find_first_zero_bit(imask_mask, IMASK_PRIORITY);
71	set_interrupt_registers(interrupt_priority);
72}
73
74static struct irq_chip imask_irq_chip = {
75	.name		= "SR.IMASK",
76	.irq_mask	= mask_imask_irq,
77	.irq_unmask	= unmask_imask_irq,
78	.irq_mask_ack	= mask_imask_irq,
79};
80
81void make_imask_irq(unsigned int irq)
82{
83	irq_set_chip_and_handler_name(irq, &imask_irq_chip, handle_level_irq,
84				      "level");
85}