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
|
// SPDX-License-Identifier: GPL-2.0
/*
* JZ47xx SoCs TCU Operating System Timer driver
*
* Copyright (C) 2016 Maarten ter Huurne <maarten@treewalker.org>
* Copyright (C) 2020 Paul Cercueil <paul@crapouillou.net>
*/
#include <linux/clk.h>
#include <linux/clocksource.h>
#include <linux/mfd/ingenic-tcu.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/sched_clock.h>
#define TCU_OST_TCSR_MASK 0xffc0
#define TCU_OST_TCSR_CNT_MD BIT(15)
#define TCU_OST_CHANNEL 15
/*
* The TCU_REG_OST_CNT{L,R} from <linux/mfd/ingenic-tcu.h> are only for the
* regmap; these are for use with the __iomem pointer.
*/
#define OST_REG_CNTL 0x4
#define OST_REG_CNTH 0x8
struct ingenic_ost_soc_info {
bool is64bit;
};
struct ingenic_ost {
void __iomem *regs;
struct clk *clk;
struct clocksource cs;
};
static struct ingenic_ost *ingenic_ost;
static u64 notrace ingenic_ost_read_cntl(void)
{
/* Read using __iomem pointer instead of regmap to avoid locking */
return readl(ingenic_ost->regs + OST_REG_CNTL);
}
static u64 notrace ingenic_ost_read_cnth(void)
{
/* Read using __iomem pointer instead of regmap to avoid locking */
return readl(ingenic_ost->regs + OST_REG_CNTH);
}
static u64 notrace ingenic_ost_clocksource_readl(struct clocksource *cs)
{
return ingenic_ost_read_cntl();
}
static u64 notrace ingenic_ost_clocksource_readh(struct clocksource *cs)
{
return ingenic_ost_read_cnth();
}
static int __init ingenic_ost_probe(struct platform_device *pdev)
{
const struct ingenic_ost_soc_info *soc_info;
struct device *dev = &pdev->dev;
struct ingenic_ost *ost;
struct clocksource *cs;
struct regmap *map;
unsigned long rate;
int err;
soc_info = device_get_match_data(dev);
if (!soc_info)
return -EINVAL;
ost = devm_kzalloc(dev, sizeof(*ost), GFP_KERNEL);
if (!ost)
return -ENOMEM;
ingenic_ost = ost;
ost->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(ost->regs))
return PTR_ERR(ost->regs);
map = device_node_to_regmap(dev->parent->of_node);
if (IS_ERR(map)) {
dev_err(dev, "regmap not found");
return PTR_ERR(map);
}
ost->clk = devm_clk_get(dev, "ost");
if (IS_ERR(ost->clk))
return PTR_ERR(ost->clk);
err = clk_prepare_enable(ost->clk);
if (err)
return err;
/* Clear counter high/low registers */
if (soc_info->is64bit)
regmap_write(map, TCU_REG_OST_CNTL, 0);
regmap_write(map, TCU_REG_OST_CNTH, 0);
/* Don't reset counter at compare value. */
regmap_update_bits(map, TCU_REG_OST_TCSR,
TCU_OST_TCSR_MASK, TCU_OST_TCSR_CNT_MD);
rate = clk_get_rate(ost->clk);
/* Enable OST TCU channel */
regmap_write(map, TCU_REG_TESR, BIT(TCU_OST_CHANNEL));
cs = &ost->cs;
cs->name = "ingenic-ost";
cs->rating = 320;
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
cs->mask = CLOCKSOURCE_MASK(32);
if (soc_info->is64bit)
cs->read = ingenic_ost_clocksource_readl;
else
cs->read = ingenic_ost_clocksource_readh;
err = clocksource_register_hz(cs, rate);
if (err) {
dev_err(dev, "clocksource registration failed");
clk_disable_unprepare(ost->clk);
return err;
}
if (soc_info->is64bit)
sched_clock_register(ingenic_ost_read_cntl, 32, rate);
else
sched_clock_register(ingenic_ost_read_cnth, 32, rate);
return 0;
}
static int ingenic_ost_suspend(struct device *dev)
{
struct ingenic_ost *ost = dev_get_drvdata(dev);
clk_disable(ost->clk);
return 0;
}
static int ingenic_ost_resume(struct device *dev)
{
struct ingenic_ost *ost = dev_get_drvdata(dev);
return clk_enable(ost->clk);
}
static const struct dev_pm_ops ingenic_ost_pm_ops = {
/* _noirq: We want the OST clock to be gated last / ungated first */
.suspend_noirq = ingenic_ost_suspend,
.resume_noirq = ingenic_ost_resume,
};
static const struct ingenic_ost_soc_info jz4725b_ost_soc_info = {
.is64bit = false,
};
static const struct ingenic_ost_soc_info jz4760b_ost_soc_info = {
.is64bit = true,
};
static const struct of_device_id ingenic_ost_of_match[] = {
{ .compatible = "ingenic,jz4725b-ost", .data = &jz4725b_ost_soc_info, },
{ .compatible = "ingenic,jz4760b-ost", .data = &jz4760b_ost_soc_info, },
{ .compatible = "ingenic,jz4770-ost", .data = &jz4760b_ost_soc_info, },
{ }
};
static struct platform_driver ingenic_ost_driver = {
.driver = {
.name = "ingenic-ost",
.pm = pm_sleep_ptr(&ingenic_ost_pm_ops),
.of_match_table = ingenic_ost_of_match,
},
};
builtin_platform_driver_probe(ingenic_ost_driver, ingenic_ost_probe);
|
