aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/sun4c_irq.c
blob: 90eea38ad66f35a02b091d8a15ef8d888c5637ca (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/*
 * sun4c irq support
 *
 *  djhr: Hacked out of irq.c into a CPU dependent version.
 *
 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
 *  Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
 *  Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
 */

#include <linux/init.h>

#include <asm/oplib.h>
#include <asm/timer.h>
#include <asm/irq.h>
#include <asm/io.h>

#include "irq.h"

/* Sun4c interrupts are typically laid out as follows:
 *
 *  1 - Software interrupt, SBUS level 1
 *  2 - SBUS level 2
 *  3 - ESP SCSI, SBUS level 3
 *  4 - Software interrupt
 *  5 - Lance ethernet, SBUS level 4
 *  6 - Software interrupt
 *  7 - Graphics card, SBUS level 5
 *  8 - SBUS level 6
 *  9 - SBUS level 7
 * 10 - Counter timer
 * 11 - Floppy
 * 12 - Zilog uart
 * 13 - CS4231 audio
 * 14 - Profiling timer
 * 15 - NMI
 *
 * The interrupt enable bits in the interrupt mask register are
 * really only used to enable/disable the timer interrupts, and
 * for signalling software interrupts.  There is also a master
 * interrupt enable bit in this register.
 *
 * Interrupts are enabled by setting the SUN4C_INT_* bits, they
 * are disabled by clearing those bits.
 */

/*
 * Bit field defines for the interrupt registers on various
 * Sparc machines.
 */

/* The sun4c interrupt register. */
#define SUN4C_INT_ENABLE  0x01     /* Allow interrupts. */
#define SUN4C_INT_E14     0x80     /* Enable level 14 IRQ. */
#define SUN4C_INT_E10     0x20     /* Enable level 10 IRQ. */
#define SUN4C_INT_E8      0x10     /* Enable level 8 IRQ. */
#define SUN4C_INT_E6      0x08     /* Enable level 6 IRQ. */
#define SUN4C_INT_E4      0x04     /* Enable level 4 IRQ. */
#define SUN4C_INT_E1      0x02     /* Enable level 1 IRQ. */

/*
 * Pointer to the interrupt enable byte
 * Used by entry.S
 */
unsigned char __iomem *interrupt_enable;

static void sun4c_disable_irq(unsigned int irq_nr)
{
	unsigned long flags;
	unsigned char current_mask, new_mask;

	local_irq_save(flags);
	irq_nr &= (NR_IRQS - 1);
	current_mask = sbus_readb(interrupt_enable);
	switch (irq_nr) {
	case 1:
		new_mask = ((current_mask) & (~(SUN4C_INT_E1)));
		break;
	case 8:
		new_mask = ((current_mask) & (~(SUN4C_INT_E8)));
		break;
	case 10:
		new_mask = ((current_mask) & (~(SUN4C_INT_E10)));
		break;
	case 14:
		new_mask = ((current_mask) & (~(SUN4C_INT_E14)));
		break;
	default:
		local_irq_restore(flags);
		return;
	}
	sbus_writeb(new_mask, interrupt_enable);
	local_irq_restore(flags);
}

static void sun4c_enable_irq(unsigned int irq_nr)
{
	unsigned long flags;
	unsigned char current_mask, new_mask;

	local_irq_save(flags);
	irq_nr &= (NR_IRQS - 1);
	current_mask = sbus_readb(interrupt_enable);
	switch (irq_nr) {
	case 1:
		new_mask = ((current_mask) | SUN4C_INT_E1);
		break;
	case 8:
		new_mask = ((current_mask) | SUN4C_INT_E8);
		break;
	case 10:
		new_mask = ((current_mask) | SUN4C_INT_E10);
		break;
	case 14:
		new_mask = ((current_mask) | SUN4C_INT_E14);
		break;
	default:
		local_irq_restore(flags);
		return;
	}
	sbus_writeb(new_mask, interrupt_enable);
	local_irq_restore(flags);
}

struct sun4c_timer_info {
	u32		l10_count;
	u32		l10_limit;
	u32		l14_count;
	u32		l14_limit;
};

static struct sun4c_timer_info __iomem *sun4c_timers;

static void sun4c_clear_clock_irq(void)
{
	sbus_readl(&sun4c_timers->l10_limit);
}

static void sun4c_load_profile_irq(int cpu, unsigned int limit)
{
	/* Errm.. not sure how to do this.. */
}

static void __init sun4c_init_timers(irq_handler_t counter_fn)
{
	const struct linux_prom_irqs *irq;
	struct device_node *dp;
	const u32 *addr;
	int err;

	dp = of_find_node_by_name(NULL, "counter-timer");
	if (!dp) {
		prom_printf("sun4c_init_timers: Unable to find counter-timer\n");
		prom_halt();
	}

	addr = of_get_property(dp, "address", NULL);
	if (!addr) {
		prom_printf("sun4c_init_timers: No address property\n");
		prom_halt();
	}

	sun4c_timers = (void __iomem *) (unsigned long) addr[0];

	irq = of_get_property(dp, "intr", NULL);
	of_node_put(dp);
	if (!irq) {
		prom_printf("sun4c_init_timers: No intr property\n");
		prom_halt();
	}

	/* Have the level 10 timer tick at 100HZ.  We don't touch the
	 * level 14 timer limit since we are letting the prom handle
	 * them until we have a real console driver so L1-A works.
	 */
	sbus_writel((((1000000/HZ) + 1) << 10), &sun4c_timers->l10_limit);

	master_l10_counter = &sun4c_timers->l10_count;

	err = request_irq(irq[0].pri, counter_fn,
			  (IRQF_DISABLED | SA_STATIC_ALLOC),
			  "timer", NULL);
	if (err) {
		prom_printf("sun4c_init_timers: request_irq() fails with %d\n", err);
		prom_halt();
	}

	sun4c_disable_irq(irq[1].pri);
}

#ifdef CONFIG_SMP
static void sun4c_nop(void)
{
}
#endif

void __init sun4c_init_IRQ(void)
{
	struct device_node *dp;
	const u32 *addr;

	dp = of_find_node_by_name(NULL, "interrupt-enable");
	if (!dp) {
		prom_printf("sun4c_init_IRQ: Unable to find interrupt-enable\n");
		prom_halt();
	}

	addr = of_get_property(dp, "address", NULL);
	of_node_put(dp);
	if (!addr) {
		prom_printf("sun4c_init_IRQ: No address property\n");
		prom_halt();
	}

	interrupt_enable = (void __iomem *) (unsigned long) addr[0];

	BTFIXUPSET_CALL(enable_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(enable_pil_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_pil_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP);

	sparc_irq_config.init_timers = sun4c_init_timers;

#ifdef CONFIG_SMP
	BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
	BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
	BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP);
#endif
	sbus_writeb(SUN4C_INT_ENABLE, interrupt_enable);
	/* Cannot enable interrupts until OBP ticker is disabled. */
}