sram.c
3.49 KB
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
/*
* linux/arch/arm/mach-mmp/sram.c
*
* based on mach-davinci/sram.c - DaVinci simple SRAM allocator
*
* Copyright (c) 2011 Marvell Semiconductors Inc.
* All Rights Reserved
*
* Add for mmp sram support - Leo Yan <leoy@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/genalloc.h>
#include <linux/platform_data/dma-mmp_tdma.h>
struct sram_bank_info {
char *pool_name;
struct gen_pool *gpool;
int granularity;
phys_addr_t sram_phys;
void __iomem *sram_virt;
u32 sram_size;
struct list_head node;
};
static DEFINE_MUTEX(sram_lock);
static LIST_HEAD(sram_bank_list);
struct gen_pool *sram_get_gpool(char *pool_name)
{
struct sram_bank_info *info = NULL;
if (!pool_name)
return NULL;
mutex_lock(&sram_lock);
list_for_each_entry(info, &sram_bank_list, node)
if (!strcmp(pool_name, info->pool_name))
break;
mutex_unlock(&sram_lock);
if (&info->node == &sram_bank_list)
return NULL;
return info->gpool;
}
EXPORT_SYMBOL(sram_get_gpool);
static int sram_probe(struct platform_device *pdev)
{
struct sram_platdata *pdata = pdev->dev.platform_data;
struct sram_bank_info *info;
struct resource *res;
int ret = 0;
if (!pdata || !pdata->pool_name)
return -ENODEV;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no memory resource defined\n");
ret = -ENODEV;
goto out;
}
if (!resource_size(res))
return 0;
info->sram_phys = (phys_addr_t)res->start;
info->sram_size = resource_size(res);
info->sram_virt = ioremap(info->sram_phys, info->sram_size);
info->pool_name = kstrdup(pdata->pool_name, GFP_KERNEL);
info->granularity = pdata->granularity;
info->gpool = gen_pool_create(ilog2(info->granularity), -1);
if (!info->gpool) {
dev_err(&pdev->dev, "create pool failed\n");
ret = -ENOMEM;
goto create_pool_err;
}
ret = gen_pool_add_virt(info->gpool, (unsigned long)info->sram_virt,
info->sram_phys, info->sram_size, -1);
if (ret < 0) {
dev_err(&pdev->dev, "add new chunk failed\n");
ret = -ENOMEM;
goto add_chunk_err;
}
mutex_lock(&sram_lock);
list_add(&info->node, &sram_bank_list);
mutex_unlock(&sram_lock);
platform_set_drvdata(pdev, info);
dev_info(&pdev->dev, "initialized\n");
return 0;
add_chunk_err:
gen_pool_destroy(info->gpool);
create_pool_err:
iounmap(info->sram_virt);
kfree(info->pool_name);
out:
kfree(info);
return ret;
}
static int sram_remove(struct platform_device *pdev)
{
struct sram_bank_info *info;
info = platform_get_drvdata(pdev);
if (info == NULL)
return -ENODEV;
mutex_lock(&sram_lock);
list_del(&info->node);
mutex_unlock(&sram_lock);
gen_pool_destroy(info->gpool);
iounmap(info->sram_virt);
kfree(info->pool_name);
kfree(info);
return 0;
}
static const struct platform_device_id sram_id_table[] = {
{ "asram", MMP_ASRAM },
{ "isram", MMP_ISRAM },
{ }
};
static struct platform_driver sram_driver = {
.probe = sram_probe,
.remove = sram_remove,
.driver = {
.name = "mmp-sram",
},
.id_table = sram_id_table,
};
static int __init sram_init(void)
{
return platform_driver_register(&sram_driver);
}
core_initcall(sram_init);
MODULE_LICENSE("GPL");