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184 lines · 4.3 KiB

1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright 2018 NXP.
4 */
5
6#include <dt-bindings/firmware/imx/rsrc.h>
7#include <linux/arm-smccc.h>
8#include <linux/firmware/imx/sci.h>
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/rtc.h>
13
14#define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9
15#define IMX_SC_TIMER_FUNC_SET_RTC_ALARM 8
16#define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6
17
18#define IMX_SIP_SRTC 0xC2000002
19#define IMX_SIP_SRTC_SET_TIME 0x0
20
21#define SC_IRQ_GROUP_RTC 2
22#define SC_IRQ_RTC 1
23
24static struct imx_sc_ipc *rtc_ipc_handle;
25static struct rtc_device *imx_sc_rtc;
26
27struct imx_sc_msg_timer_get_rtc_time {
28 struct imx_sc_rpc_msg hdr;
29 u32 time;
30} __packed;
31
32struct imx_sc_msg_timer_rtc_set_alarm {
33 struct imx_sc_rpc_msg hdr;
34 u16 year;
35 u8 mon;
36 u8 day;
37 u8 hour;
38 u8 min;
39 u8 sec;
40} __packed __aligned(4);
41
42static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
43{
44 struct imx_sc_msg_timer_get_rtc_time msg;
45 struct imx_sc_rpc_msg *hdr = &msg.hdr;
46 int ret;
47
48 hdr->ver = IMX_SC_RPC_VERSION;
49 hdr->svc = IMX_SC_RPC_SVC_TIMER;
50 hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970;
51 hdr->size = 1;
52
53 ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
54 if (ret) {
55 dev_err(dev, "read rtc time failed, ret %d\n", ret);
56 return ret;
57 }
58
59 rtc_time64_to_tm(msg.time, tm);
60
61 return 0;
62}
63
64static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm)
65{
66 struct arm_smccc_res res;
67
68 /* pack 2 time parameters into 1 register, 16 bits for each */
69 arm_smccc_smc(IMX_SIP_SRTC, IMX_SIP_SRTC_SET_TIME,
70 ((tm->tm_year + 1900) << 16) | (tm->tm_mon + 1),
71 (tm->tm_mday << 16) | tm->tm_hour,
72 (tm->tm_min << 16) | tm->tm_sec,
73 0, 0, 0, &res);
74
75 return res.a0;
76}
77
78static int imx_sc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
79{
80 return imx_scu_irq_group_enable(SC_IRQ_GROUP_RTC, SC_IRQ_RTC, enable);
81}
82
83static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
84{
85 struct imx_sc_msg_timer_rtc_set_alarm msg;
86 struct imx_sc_rpc_msg *hdr = &msg.hdr;
87 int ret;
88 struct rtc_time *alrm_tm = &alrm->time;
89
90 hdr->ver = IMX_SC_RPC_VERSION;
91 hdr->svc = IMX_SC_RPC_SVC_TIMER;
92 hdr->func = IMX_SC_TIMER_FUNC_SET_RTC_ALARM;
93 hdr->size = 3;
94
95 msg.year = alrm_tm->tm_year + 1900;
96 msg.mon = alrm_tm->tm_mon + 1;
97 msg.day = alrm_tm->tm_mday;
98 msg.hour = alrm_tm->tm_hour;
99 msg.min = alrm_tm->tm_min;
100 msg.sec = alrm_tm->tm_sec;
101
102 ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
103 if (ret) {
104 dev_err(dev, "set rtc alarm failed, ret %d\n", ret);
105 return ret;
106 }
107
108 ret = imx_sc_rtc_alarm_irq_enable(dev, alrm->enabled);
109 if (ret) {
110 dev_err(dev, "enable rtc alarm failed, ret %d\n", ret);
111 return ret;
112 }
113
114 return 0;
115}
116
117static const struct rtc_class_ops imx_sc_rtc_ops = {
118 .read_time = imx_sc_rtc_read_time,
119 .set_time = imx_sc_rtc_set_time,
120 .set_alarm = imx_sc_rtc_set_alarm,
121 .alarm_irq_enable = imx_sc_rtc_alarm_irq_enable,
122};
123
124static int imx_sc_rtc_alarm_notify(struct notifier_block *nb,
125 unsigned long event, void *group)
126{
127 /* ignore non-rtc irq */
128 if (!((event & SC_IRQ_RTC) && (*(u8 *)group == SC_IRQ_GROUP_RTC)))
129 return 0;
130
131 rtc_update_irq(imx_sc_rtc, 1, RTC_IRQF | RTC_AF);
132
133 return 0;
134}
135
136static struct notifier_block imx_sc_rtc_alarm_sc_notifier = {
137 .notifier_call = imx_sc_rtc_alarm_notify,
138};
139
140static int imx_sc_rtc_probe(struct platform_device *pdev)
141{
142 int ret;
143
144 ret = imx_scu_get_handle(&rtc_ipc_handle);
145 if (ret)
146 return ret;
147
148 device_init_wakeup(&pdev->dev, true);
149
150 imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev);
151 if (IS_ERR(imx_sc_rtc))
152 return PTR_ERR(imx_sc_rtc);
153
154 imx_sc_rtc->ops = &imx_sc_rtc_ops;
155 imx_sc_rtc->range_min = 0;
156 imx_sc_rtc->range_max = U32_MAX;
157
158 ret = devm_rtc_register_device(imx_sc_rtc);
159 if (ret)
160 return ret;
161
162 imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier);
163
164 return 0;
165}
166
167static const struct of_device_id imx_sc_dt_ids[] = {
168 { .compatible = "fsl,imx8qxp-sc-rtc", },
169 {}
170};
171MODULE_DEVICE_TABLE(of, imx_sc_dt_ids);
172
173static struct platform_driver imx_sc_rtc_driver = {
174 .driver = {
175 .name = "imx-sc-rtc",
176 .of_match_table = imx_sc_dt_ids,
177 },
178 .probe = imx_sc_rtc_probe,
179};
180module_platform_driver(imx_sc_rtc_driver);
181
182MODULE_AUTHOR("Anson Huang <[email protected]>");
183MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver");
184MODULE_LICENSE("GPL");