summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/cell/cbe_regs.c
blob: ce696c1cca75b4946eced462d48a2f9e9df0638f (plain)
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
/*
 * 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/config.h>
#include <linux/percpu.h>
#include <linux/types.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/ptrace.h>

#include "cbe_regs.h"

#define MAX_CBE		2

/*
 * 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;
} 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;

	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;
}

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;
}


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;
}

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 ! */
		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 = (struct address_prop *)get_property(cpu, "pervasive",
							   NULL);
		if (prop != NULL)
			map->pmd_regs = ioremap(prop->address, prop->len);

		prop = (struct address_prop *)get_property(cpu, "iic",
							   NULL);
		if (prop != NULL)
			map->iic_regs = ioremap(prop->address, prop->len);
	}
}