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
|
/*
* NAND Flash Controller Device Driver for DT
*
* Copyright © 2011, Picochip.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include "denali.h"
struct denali_dt {
struct denali_nand_info denali;
struct clk *clk;
};
static void __iomem *request_and_map(struct device *dev,
const struct resource *res)
{
void __iomem *ptr;
if (!devm_request_mem_region(dev, res->start, resource_size(res),
"denali-dt")) {
dev_err(dev, "unable to request %s\n", res->name);
return NULL;
}
ptr = devm_ioremap_nocache(dev, res->start, resource_size(res));
if (!ptr)
dev_err(dev, "ioremap_nocache of %s failed!", res->name);
return ptr;
}
static const struct of_device_id denali_nand_dt_ids[] = {
{ .compatible = "denali,denali-nand-dt" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
static u64 denali_dma_mask;
static int denali_dt_probe(struct platform_device *ofdev)
{
struct resource *denali_reg, *nand_data;
struct denali_dt *dt;
struct denali_nand_info *denali;
int ret;
const struct of_device_id *of_id;
of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
if (of_id) {
ofdev->id_entry = of_id->data;
} else {
pr_err("Failed to find the right device id.\n");
return -ENOMEM;
}
dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
if (!dt)
return -ENOMEM;
denali = &dt->denali;
denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
if (!denali_reg || !nand_data) {
dev_err(&ofdev->dev, "resources not completely defined\n");
return -EINVAL;
}
denali->platform = DT;
denali->dev = &ofdev->dev;
denali->irq = platform_get_irq(ofdev, 0);
if (denali->irq < 0) {
dev_err(&ofdev->dev, "no irq defined\n");
return -ENXIO;
}
denali->flash_reg = request_and_map(&ofdev->dev, denali_reg);
if (!denali->flash_reg)
return -ENOMEM;
denali->flash_mem = request_and_map(&ofdev->dev, nand_data);
if (!denali->flash_mem)
return -ENOMEM;
if (!of_property_read_u32(ofdev->dev.of_node,
"dma-mask", (u32 *)&denali_dma_mask)) {
denali->dev->dma_mask = &denali_dma_mask;
} else {
denali->dev->dma_mask = NULL;
}
dt->clk = clk_get(&ofdev->dev, NULL);
if (IS_ERR(dt->clk)) {
dev_err(&ofdev->dev, "no clk available\n");
return PTR_ERR(dt->clk);
}
clk_prepare_enable(dt->clk);
ret = denali_init(denali);
if (ret)
goto out_disable_clk;
platform_set_drvdata(ofdev, dt);
return 0;
out_disable_clk:
clk_disable_unprepare(dt->clk);
clk_put(dt->clk);
return ret;
}
static int denali_dt_remove(struct platform_device *ofdev)
{
struct denali_dt *dt = platform_get_drvdata(ofdev);
denali_remove(&dt->denali);
clk_disable(dt->clk);
clk_put(dt->clk);
return 0;
}
static struct platform_driver denali_dt_driver = {
.probe = denali_dt_probe,
.remove = denali_dt_remove,
.driver = {
.name = "denali-nand-dt",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(denali_nand_dt_ids),
},
};
module_platform_driver(denali_dt_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamie Iles");
MODULE_DESCRIPTION("DT driver for Denali NAND controller");
|
