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
191
192
193
194
195
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 NXP.
*/
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/arm-smccc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9
#define IMX_SC_TIMER_FUNC_SET_RTC_ALARM 8
#define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6
#define IMX_SIP_SRTC 0xC2000002
#define IMX_SIP_SRTC_SET_TIME 0x0
#define SC_IRQ_GROUP_RTC 2
#define SC_IRQ_RTC 1
static struct imx_sc_ipc *rtc_ipc_handle;
static struct rtc_device *imx_sc_rtc;
struct imx_sc_msg_timer_get_rtc_time {
struct imx_sc_rpc_msg hdr;
u32 time;
} __packed;
struct imx_sc_msg_timer_rtc_set_alarm {
struct imx_sc_rpc_msg hdr;
u16 year;
u8 mon;
u8 day;
u8 hour;
u8 min;
u8 sec;
} __packed __aligned(4);
static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct imx_sc_msg_timer_get_rtc_time msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
int ret;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_TIMER;
hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970;
hdr->size = 1;
ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
if (ret) {
dev_err(dev, "read rtc time failed, ret %d\n", ret);
return ret;
}
rtc_time64_to_tm(msg.time, tm);
return 0;
}
static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct arm_smccc_res res;
/* pack 2 time parameters into 1 register, 16 bits for each */
arm_smccc_smc(IMX_SIP_SRTC, IMX_SIP_SRTC_SET_TIME,
((tm->tm_year + 1900) << 16) | (tm->tm_mon + 1),
(tm->tm_mday << 16) | tm->tm_hour,
(tm->tm_min << 16) | tm->tm_sec,
0, 0, 0, &res);
return res.a0;
}
static int imx_sc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
{
return imx_scu_irq_group_enable(SC_IRQ_GROUP_RTC, SC_IRQ_RTC, enable);
}
static int imx_sc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
/*
* SCU firmware does NOT provide read alarm API, but .read_alarm
* callback is required by RTC framework to support alarm function,
* so just return here.
*/
return 0;
}
static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct imx_sc_msg_timer_rtc_set_alarm msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
int ret;
struct rtc_time *alrm_tm = &alrm->time;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_TIMER;
hdr->func = IMX_SC_TIMER_FUNC_SET_RTC_ALARM;
hdr->size = 3;
msg.year = alrm_tm->tm_year + 1900;
msg.mon = alrm_tm->tm_mon + 1;
msg.day = alrm_tm->tm_mday;
msg.hour = alrm_tm->tm_hour;
msg.min = alrm_tm->tm_min;
msg.sec = alrm_tm->tm_sec;
ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
if (ret) {
dev_err(dev, "set rtc alarm failed, ret %d\n", ret);
return ret;
}
ret = imx_sc_rtc_alarm_irq_enable(dev, alrm->enabled);
if (ret) {
dev_err(dev, "enable rtc alarm failed, ret %d\n", ret);
return ret;
}
return 0;
}
static const struct rtc_class_ops imx_sc_rtc_ops = {
.read_time = imx_sc_rtc_read_time,
.set_time = imx_sc_rtc_set_time,
.read_alarm = imx_sc_rtc_read_alarm,
.set_alarm = imx_sc_rtc_set_alarm,
.alarm_irq_enable = imx_sc_rtc_alarm_irq_enable,
};
static int imx_sc_rtc_alarm_notify(struct notifier_block *nb,
unsigned long event, void *group)
{
/* ignore non-rtc irq */
if (!((event & SC_IRQ_RTC) && (*(u8 *)group == SC_IRQ_GROUP_RTC)))
return 0;
rtc_update_irq(imx_sc_rtc, 1, RTC_IRQF | RTC_AF);
return 0;
}
static struct notifier_block imx_sc_rtc_alarm_sc_notifier = {
.notifier_call = imx_sc_rtc_alarm_notify,
};
static int imx_sc_rtc_probe(struct platform_device *pdev)
{
int ret;
ret = imx_scu_get_handle(&rtc_ipc_handle);
if (ret)
return ret;
device_init_wakeup(&pdev->dev, true);
imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(imx_sc_rtc))
return PTR_ERR(imx_sc_rtc);
imx_sc_rtc->ops = &imx_sc_rtc_ops;
imx_sc_rtc->range_min = 0;
imx_sc_rtc->range_max = U32_MAX;
ret = devm_rtc_register_device(imx_sc_rtc);
if (ret)
return ret;
imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier);
return 0;
}
static const struct of_device_id imx_sc_dt_ids[] = {
{ .compatible = "fsl,imx8qxp-sc-rtc", },
{}
};
MODULE_DEVICE_TABLE(of, imx_sc_dt_ids);
static struct platform_driver imx_sc_rtc_driver = {
.driver = {
.name = "imx-sc-rtc",
.of_match_table = imx_sc_dt_ids,
},
.probe = imx_sc_rtc_probe,
};
module_platform_driver(imx_sc_rtc_driver);
MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver");
MODULE_LICENSE("GPL");
|
