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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
|
/*
* Basic EISA bus support for the SGI Indigo-2.
*
* (C) 2002 Pascal Dameme <netinet@freesurf.fr>
* and Marc Zyngier <mzyngier@freesurf.fr>
*
* This code is released under both the GPL version 2 and BSD
* licenses. Either license may be used.
*
* This code offers a very basic support for this EISA bus present in
* the SGI Indigo-2. It currently only supports PIO (forget about DMA
* for the time being). This is enough for a low-end ethernet card,
* but forget about your favorite SCSI card...
*
* TODO :
* - Fix bugs...
* - Add ISA support
* - Add DMA (yeah, right...).
* - Fix more bugs.
*/
#include <linux/eisa.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/processor.h>
#include <asm/sgi/ioc.h>
#include <asm/sgi/mc.h>
#include <asm/sgi/ip22.h>
/* I2 has four EISA slots. */
#define IP22_EISA_MAX_SLOTS 4
#define EISA_MAX_IRQ 16
#define EIU_MODE_REG 0x0001ffc0
#define EIU_STAT_REG 0x0001ffc4
#define EIU_PREMPT_REG 0x0001ffc8
#define EIU_QUIET_REG 0x0001ffcc
#define EIU_INTRPT_ACK 0x00010004
static char __init *decode_eisa_sig(unsigned long addr)
{
static char sig_str[EISA_SIG_LEN];
u8 sig[4];
u16 rev;
int i;
for (i = 0; i < 4; i++) {
sig[i] = inb (addr + i);
if (!i && (sig[0] & 0x80))
return NULL;
}
sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
rev = (sig[2] << 8) | sig[3];
sprintf(sig_str + 3, "%04X", rev);
return sig_str;
}
static irqreturn_t ip22_eisa_intr(int irq, void *dev_id, struct pt_regs *regs)
{
u8 eisa_irq;
u8 dma1, dma2;
eisa_irq = inb(EIU_INTRPT_ACK);
dma1 = inb(EISA_DMA1_STATUS);
dma2 = inb(EISA_DMA2_STATUS);
if (eisa_irq < EISA_MAX_IRQ) {
do_IRQ(eisa_irq, regs);
return IRQ_HANDLED;
}
/* Oops, Bad Stuff Happened... */
printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq);
outb(0x20, EISA_INT2_CTRL);
outb(0x20, EISA_INT1_CTRL);
return IRQ_NONE;
}
static void enable_eisa1_irq(unsigned int irq)
{
unsigned long flags;
u8 mask;
local_irq_save(flags);
mask = inb(EISA_INT1_MASK);
mask &= ~((u8) (1 << irq));
outb(mask, EISA_INT1_MASK);
local_irq_restore(flags);
}
static unsigned int startup_eisa1_irq(unsigned int irq)
{
u8 edge;
/* Only use edge interrupts for EISA */
edge = inb(EISA_INT1_EDGE_LEVEL);
edge &= ~((u8) (1 << irq));
outb(edge, EISA_INT1_EDGE_LEVEL);
enable_eisa1_irq(irq);
return 0;
}
static void disable_eisa1_irq(unsigned int irq)
{
u8 mask;
mask = inb(EISA_INT1_MASK);
mask |= ((u8) (1 << irq));
outb(mask, EISA_INT1_MASK);
}
#define shutdown_eisa1_irq disable_eisa1_irq
static void mask_and_ack_eisa1_irq(unsigned int irq)
{
disable_eisa1_irq(irq);
outb(0x20, EISA_INT1_CTRL);
}
static void end_eisa1_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
enable_eisa1_irq(irq);
}
static struct hw_interrupt_type ip22_eisa1_irq_type = {
.typename = "IP22 EISA",
.startup = startup_eisa1_irq,
.shutdown = shutdown_eisa1_irq,
.enable = enable_eisa1_irq,
.disable = disable_eisa1_irq,
.ack = mask_and_ack_eisa1_irq,
.end = end_eisa1_irq,
};
static void enable_eisa2_irq(unsigned int irq)
{
unsigned long flags;
u8 mask;
local_irq_save(flags);
mask = inb(EISA_INT2_MASK);
mask &= ~((u8) (1 << (irq - 8)));
outb(mask, EISA_INT2_MASK);
local_irq_restore(flags);
}
static unsigned int startup_eisa2_irq(unsigned int irq)
{
u8 edge;
/* Only use edge interrupts for EISA */
edge = inb(EISA_INT2_EDGE_LEVEL);
edge &= ~((u8) (1 << (irq - 8)));
outb(edge, EISA_INT2_EDGE_LEVEL);
enable_eisa2_irq(irq);
return 0;
}
static void disable_eisa2_irq(unsigned int irq)
{
u8 mask;
mask = inb(EISA_INT2_MASK);
mask |= ((u8) (1 << (irq - 8)));
outb(mask, EISA_INT2_MASK);
}
#define shutdown_eisa2_irq disable_eisa2_irq
static void mask_and_ack_eisa2_irq(unsigned int irq)
{
disable_eisa2_irq(irq);
outb(0x20, EISA_INT2_CTRL);
}
static void end_eisa2_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
enable_eisa2_irq(irq);
}
static struct hw_interrupt_type ip22_eisa2_irq_type = {
.typename = "IP22 EISA",
.startup = startup_eisa2_irq,
.shutdown = shutdown_eisa2_irq,
.enable = enable_eisa2_irq,
.disable = disable_eisa2_irq,
.ack = mask_and_ack_eisa2_irq,
.end = end_eisa2_irq,
};
static struct irqaction eisa_action = {
.handler = ip22_eisa_intr,
.name = "EISA",
};
static struct irqaction cascade_action = {
.handler = no_action,
.name = "EISA cascade",
};
int __init ip22_eisa_init(void)
{
int i, c;
char *str;
if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) {
printk(KERN_INFO "EISA: bus not present.\n");
return 1;
}
printk(KERN_INFO "EISA: Probing bus...\n");
for (c = 0, i = 1; i <= IP22_EISA_MAX_SLOTS; i++) {
if ((str = decode_eisa_sig(0x1000 * i + EISA_VENDOR_ID_OFFSET))) {
printk(KERN_INFO "EISA: slot %d : %s detected.\n",
i, str);
c++;
}
}
printk(KERN_INFO "EISA: Detected %d card%s.\n", c, c < 2 ? "" : "s");
#ifdef CONFIG_ISA
printk(KERN_INFO "ISA support compiled in.\n");
#endif
/* Warning : BlackMagicAhead(tm).
Please wave your favorite dead chicken over the busses */
/* First say hello to the EIU */
outl(0x0000FFFF, EIU_PREMPT_REG);
outl(1, EIU_QUIET_REG);
outl(0x40f3c07F, EIU_MODE_REG);
/* Now be nice to the EISA chipset */
outb(1, EISA_EXT_NMI_RESET_CTRL);
udelay(50); /* Wait long enough for the dust to settle */
outb(0, EISA_EXT_NMI_RESET_CTRL);
outb(0x11, EISA_INT1_CTRL);
outb(0x11, EISA_INT2_CTRL);
outb(0, EISA_INT1_MASK);
outb(8, EISA_INT2_MASK);
outb(4, EISA_INT1_MASK);
outb(2, EISA_INT2_MASK);
outb(1, EISA_INT1_MASK);
outb(1, EISA_INT2_MASK);
outb(0xfb, EISA_INT1_MASK);
outb(0xff, EISA_INT2_MASK);
outb(0, EISA_DMA2_WRITE_SINGLE);
for (i = SGINT_EISA; i < (SGINT_EISA + EISA_MAX_IRQ); i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = 0;
irq_desc[i].depth = 1;
if (i < (SGINT_EISA + 8))
irq_desc[i].chip = &ip22_eisa1_irq_type;
else
irq_desc[i].chip = &ip22_eisa2_irq_type;
}
/* Cannot use request_irq because of kmalloc not being ready at such
* an early stage. Yes, I've been bitten... */
setup_irq(SGI_EISA_IRQ, &eisa_action);
setup_irq(SGINT_EISA + 2, &cascade_action);
EISA_bus = 1;
return 0;
}
|
