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
|
/*
* cbe_regs.c
*
* Accessor routines for the various MMIO register blocks of the CBE
*
* (c) 2006 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
*/
#include <linux/percpu.h>
#include <linux/types.h>
#include <linux/module.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
#include "cbe_regs.h"
/*
* Current implementation uses "cpu" nodes. We build our own mapping
* array of cpu numbers to cpu nodes locally for now to allow interrupt
* time code to have a fast path rather than call of_get_cpu_node(). If
* we implement cpu hotplug, we'll have to install an appropriate norifier
* in order to release references to the cpu going away
*/
static struct cbe_regs_map
{
struct device_node *cpu_node;
struct cbe_pmd_regs __iomem *pmd_regs;
struct cbe_iic_regs __iomem *iic_regs;
struct cbe_mic_tm_regs __iomem *mic_tm_regs;
struct cbe_pmd_shadow_regs pmd_shadow_regs;
} cbe_regs_maps[MAX_CBE];
static int cbe_regs_map_count;
static struct cbe_thread_map
{
struct device_node *cpu_node;
struct cbe_regs_map *regs;
} cbe_thread_map[NR_CPUS];
static struct cbe_regs_map *cbe_find_map(struct device_node *np)
{
int i;
struct device_node *tmp_np;
if (strcasecmp(np->type, "spe") == 0) {
if (np->data == NULL) {
/* walk up path until cpu node was found */
tmp_np = np->parent;
while (tmp_np != NULL && strcasecmp(tmp_np->type, "cpu") != 0)
tmp_np = tmp_np->parent;
np->data = cbe_find_map(tmp_np);
}
return np->data;
}
for (i = 0; i < cbe_regs_map_count; i++)
if (cbe_regs_maps[i].cpu_node == np)
return &cbe_regs_maps[i];
return NULL;
}
struct cbe_pmd_regs __iomem *cbe_get_pmd_regs(struct device_node *np)
{
struct cbe_regs_map *map = cbe_find_map(np);
if (map == NULL)
return NULL;
return map->pmd_regs;
}
EXPORT_SYMBOL_GPL(cbe_get_pmd_regs);
struct cbe_pmd_regs __iomem *cbe_get_cpu_pmd_regs(int cpu)
{
struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
if (map == NULL)
return NULL;
return map->pmd_regs;
}
EXPORT_SYMBOL_GPL(cbe_get_cpu_pmd_regs);
struct cbe_pmd_shadow_regs *cbe_get_pmd_shadow_regs(struct device_node *np)
{
struct cbe_regs_map *map = cbe_find_map(np);
if (map == NULL)
return NULL;
return &map->pmd_shadow_regs;
}
struct cbe_pmd_shadow_regs *cbe_get_cpu_pmd_shadow_regs(int cpu)
{
struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
if (map == NULL)
return NULL;
return &map->pmd_shadow_regs;
}
struct cbe_iic_regs __iomem *cbe_get_iic_regs(struct device_node *np)
{
struct cbe_regs_map *map = cbe_find_map(np);
if (map == NULL)
return NULL;
return map->iic_regs;
}
struct cbe_iic_regs __iomem *cbe_get_cpu_iic_regs(int cpu)
{
struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
if (map == NULL)
return NULL;
return map->iic_regs;
}
struct cbe_mic_tm_regs __iomem *cbe_get_mic_tm_regs(struct device_node *np)
{
struct cbe_regs_map *map = cbe_find_map(np);
if (map == NULL)
return NULL;
return map->mic_tm_regs;
}
struct cbe_mic_tm_regs __iomem *cbe_get_cpu_mic_tm_regs(int cpu)
{
struct cbe_regs_map *map = cbe_thread_map[cpu].regs;
if (map == NULL)
return NULL;
return map->mic_tm_regs;
}
EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);
/* FIXME
* This is little more than a stub at the moment. It should be
* fleshed out so that it works for both SMT and non-SMT, no
* matter if the passed cpu is odd or even.
* For SMT enabled, returns 0 for even-numbered cpu; otherwise 1.
* For SMT disabled, returns 0 for all cpus.
*/
u32 cbe_get_hw_thread_id(int cpu)
{
return (cpu & 1);
}
EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
void __init cbe_regs_init(void)
{
int i;
struct device_node *cpu;
/* Build local fast map of CPUs */
for_each_possible_cpu(i)
cbe_thread_map[i].cpu_node = of_get_cpu_node(i, NULL);
/* Find maps for each device tree CPU */
for_each_node_by_type(cpu, "cpu") {
struct cbe_regs_map *map = &cbe_regs_maps[cbe_regs_map_count++];
/* That hack must die die die ! */
const struct address_prop {
unsigned long address;
unsigned int len;
} __attribute__((packed)) *prop;
if (cbe_regs_map_count > MAX_CBE) {
printk(KERN_ERR "cbe_regs: More BE chips than supported"
"!\n");
cbe_regs_map_count--;
return;
}
map->cpu_node = cpu;
for_each_possible_cpu(i)
if (cbe_thread_map[i].cpu_node == cpu)
cbe_thread_map[i].regs = map;
prop = of_get_property(cpu, "pervasive", NULL);
if (prop != NULL)
map->pmd_regs = ioremap(prop->address, prop->len);
prop = of_get_property(cpu, "iic", NULL);
if (prop != NULL)
map->iic_regs = ioremap(prop->address, prop->len);
prop = of_get_property(cpu, "mic-tm", NULL);
if (prop != NULL)
map->mic_tm_regs = ioremap(prop->address, prop->len);
}
}
|
