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
|
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* arch/sh64/kernel/irq_cayman.c
*
* SH-5 Cayman Interrupt Support
*
* This file handles the board specific parts of the Cayman interrupt system
*
* Copyright (C) 2002 Stuart Menefy
*/
#include <linux/config.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/signal.h>
#include <asm/cayman.h>
unsigned long epld_virt;
#define EPLD_BASE 0x04002000
#define EPLD_STATUS_BASE (epld_virt + 0x10)
#define EPLD_MASK_BASE (epld_virt + 0x20)
/* Note the SMSC SuperIO chip and SMSC LAN chip interrupts are all muxed onto
the same SH-5 interrupt */
static irqreturn_t cayman_interrupt_smsc(int irq, void *dev_id, struct pt_regs *regs)
{
printk(KERN_INFO "CAYMAN: spurious SMSC interrupt\n");
return IRQ_NONE;
}
static irqreturn_t cayman_interrupt_pci2(int irq, void *dev_id, struct pt_regs *regs)
{
printk(KERN_INFO "CAYMAN: spurious PCI interrupt, IRQ %d\n", irq);
return IRQ_NONE;
}
static struct irqaction cayman_action_smsc = {
.name = "Cayman SMSC Mux",
.handler = cayman_interrupt_smsc,
.flags = SA_INTERRUPT,
};
static struct irqaction cayman_action_pci2 = {
.name = "Cayman PCI2 Mux",
.handler = cayman_interrupt_pci2,
.flags = SA_INTERRUPT,
};
static void enable_cayman_irq(unsigned int irq)
{
unsigned long flags;
unsigned long mask;
unsigned int reg;
unsigned char bit;
irq -= START_EXT_IRQS;
reg = EPLD_MASK_BASE + ((irq / 8) << 2);
bit = 1<<(irq % 8);
local_irq_save(flags);
mask = ctrl_inl(reg);
mask |= bit;
ctrl_outl(mask, reg);
local_irq_restore(flags);
}
void disable_cayman_irq(unsigned int irq)
{
unsigned long flags;
unsigned long mask;
unsigned int reg;
unsigned char bit;
irq -= START_EXT_IRQS;
reg = EPLD_MASK_BASE + ((irq / 8) << 2);
bit = 1<<(irq % 8);
local_irq_save(flags);
mask = ctrl_inl(reg);
mask &= ~bit;
ctrl_outl(mask, reg);
local_irq_restore(flags);
}
static void ack_cayman_irq(unsigned int irq)
{
disable_cayman_irq(irq);
}
static void end_cayman_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_cayman_irq(irq);
}
static unsigned int startup_cayman_irq(unsigned int irq)
{
enable_cayman_irq(irq);
return 0; /* never anything pending */
}
static void shutdown_cayman_irq(unsigned int irq)
{
disable_cayman_irq(irq);
}
struct hw_interrupt_type cayman_irq_type = {
.typename = "Cayman-IRQ",
.startup = startup_cayman_irq,
.shutdown = shutdown_cayman_irq,
.enable = enable_cayman_irq,
.disable = disable_cayman_irq,
.ack = ack_cayman_irq,
.end = end_cayman_irq,
};
int cayman_irq_demux(int evt)
{
int irq = intc_evt_to_irq[evt];
if (irq == SMSC_IRQ) {
unsigned long status;
int i;
status = ctrl_inl(EPLD_STATUS_BASE) &
ctrl_inl(EPLD_MASK_BASE) & 0xff;
if (status == 0) {
irq = -1;
} else {
for (i=0; i<8; i++) {
if (status & (1<<i))
break;
}
irq = START_EXT_IRQS + i;
}
}
if (irq == PCI2_IRQ) {
unsigned long status;
int i;
status = ctrl_inl(EPLD_STATUS_BASE + 3 * sizeof(u32)) &
ctrl_inl(EPLD_MASK_BASE + 3 * sizeof(u32)) & 0xff;
if (status == 0) {
irq = -1;
} else {
for (i=0; i<8; i++) {
if (status & (1<<i))
break;
}
irq = START_EXT_IRQS + (3 * 8) + i;
}
}
return irq;
}
#if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL)
int cayman_irq_describe(char* p, int irq)
{
if (irq < NR_INTC_IRQS) {
return intc_irq_describe(p, irq);
} else if (irq < NR_INTC_IRQS + 8) {
return sprintf(p, "(SMSC %d)", irq - NR_INTC_IRQS);
} else if ((irq >= NR_INTC_IRQS + 24) && (irq < NR_INTC_IRQS + 32)) {
return sprintf(p, "(PCI2 %d)", irq - (NR_INTC_IRQS + 24));
}
return 0;
}
#endif
void init_cayman_irq(void)
{
int i;
epld_virt = onchip_remap(EPLD_BASE, 1024, "EPLD");
if (!epld_virt) {
printk(KERN_ERR "Cayman IRQ: Unable to remap EPLD\n");
return;
}
for (i=0; i<NR_EXT_IRQS; i++) {
irq_desc[START_EXT_IRQS + i].chip = &cayman_irq_type;
}
/* Setup the SMSC interrupt */
setup_irq(SMSC_IRQ, &cayman_action_smsc);
setup_irq(PCI2_IRQ, &cayman_action_pci2);
}
|
