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
|
/*
* PowerNV OPAL high level interfaces
*
* Copyright 2011 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#undef DEBUG
#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <asm/opal.h>
#include <asm/firmware.h>
#include "powernv.h"
struct opal {
u64 base;
u64 entry;
} opal;
static struct device_node *opal_node;
static DEFINE_SPINLOCK(opal_write_lock);
int __init early_init_dt_scan_opal(unsigned long node,
const char *uname, int depth, void *data)
{
const void *basep, *entryp;
unsigned long basesz, entrysz;
if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
return 0;
basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
if (!basep || !entryp)
return 1;
opal.base = of_read_number(basep, basesz/4);
opal.entry = of_read_number(entryp, entrysz/4);
pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n",
opal.base, basep, basesz);
pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
opal.entry, entryp, entrysz);
powerpc_firmware_features |= FW_FEATURE_OPAL;
if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
powerpc_firmware_features |= FW_FEATURE_OPALv2;
printk("OPAL V2 detected !\n");
} else {
printk("OPAL V1 detected !\n");
}
return 1;
}
int opal_get_chars(uint32_t vtermno, char *buf, int count)
{
s64 len, rc;
u64 evt;
if (!opal.entry)
return -ENODEV;
opal_poll_events(&evt);
if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0)
return 0;
len = count;
rc = opal_console_read(vtermno, &len, buf);
if (rc == OPAL_SUCCESS)
return len;
return 0;
}
int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
{
int written = 0;
s64 len, rc;
unsigned long flags;
u64 evt;
if (!opal.entry)
return -ENODEV;
/* We want put_chars to be atomic to avoid mangling of hvsi
* packets. To do that, we first test for room and return
* -EAGAIN if there isn't enough.
*
* Unfortunately, opal_console_write_buffer_space() doesn't
* appear to work on opal v1, so we just assume there is
* enough room and be done with it
*/
spin_lock_irqsave(&opal_write_lock, flags);
if (firmware_has_feature(FW_FEATURE_OPALv2)) {
rc = opal_console_write_buffer_space(vtermno, &len);
if (rc || len < total_len) {
spin_unlock_irqrestore(&opal_write_lock, flags);
/* Closed -> drop characters */
if (rc)
return total_len;
opal_poll_events(&evt);
return -EAGAIN;
}
}
/* We still try to handle partial completions, though they
* should no longer happen.
*/
rc = OPAL_BUSY;
while(total_len > 0 && (rc == OPAL_BUSY ||
rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
len = total_len;
rc = opal_console_write(vtermno, &len, data);
if (rc == OPAL_SUCCESS) {
total_len -= len;
data += len;
written += len;
}
/* This is a bit nasty but we need that for the console to
* flush when there aren't any interrupts. We will clean
* things a bit later to limit that to synchronous path
* such as the kernel console and xmon/udbg
*/
do
opal_poll_events(&evt);
while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT));
}
spin_unlock_irqrestore(&opal_write_lock, flags);
return written;
}
static irqreturn_t opal_interrupt(int irq, void *data)
{
uint64_t events;
opal_handle_interrupt(virq_to_hw(irq), &events);
/* XXX TODO: Do something with the events */
return IRQ_HANDLED;
}
static int __init opal_init(void)
{
struct device_node *np, *consoles;
const u32 *irqs;
int rc, i, irqlen;
opal_node = of_find_node_by_path("/ibm,opal");
if (!opal_node) {
pr_warn("opal: Node not found\n");
return -ENODEV;
}
if (firmware_has_feature(FW_FEATURE_OPALv2))
consoles = of_find_node_by_path("/ibm,opal/consoles");
else
consoles = of_node_get(opal_node);
/* Register serial ports */
for_each_child_of_node(consoles, np) {
if (strcmp(np->name, "serial"))
continue;
of_platform_device_create(np, NULL, NULL);
}
of_node_put(consoles);
/* Find all OPAL interrupts and request them */
irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
pr_debug("opal: Found %d interrupts reserved for OPAL\n",
irqs ? (irqlen / 4) : 0);
for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
unsigned int hwirq = be32_to_cpup(irqs);
unsigned int irq = irq_create_mapping(NULL, hwirq);
if (irq == NO_IRQ) {
pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
continue;
}
rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
if (rc)
pr_warning("opal: Error %d requesting irq %d"
" (0x%x)\n", rc, irq, hwirq);
}
return 0;
}
subsys_initcall(opal_init);
|
