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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;
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
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_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
84{
85
86
87
88
89
90 return 0;
91}
92
93static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
94{
95 struct imx_sc_msg_timer_rtc_set_alarm msg;
96 struct imx_sc_rpc_msg *hdr = &msg.hdr;
97 int ret;
98 struct rtc_time *alrm_tm = &alrm->time;
99
100 hdr->ver = IMX_SC_RPC_VERSION;
101 hdr->svc = IMX_SC_RPC_SVC_TIMER;
102 hdr->func = IMX_SC_TIMER_FUNC_SET_RTC_ALARM;
103 hdr->size = 3;
104
105 msg.year = alrm_tm->tm_year + 1900;
106 msg.mon = alrm_tm->tm_mon + 1;
107 msg.day = alrm_tm->tm_mday;
108 msg.hour = alrm_tm->tm_hour;
109 msg.min = alrm_tm->tm_min;
110 msg.sec = alrm_tm->tm_sec;
111
112 ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
113 if (ret) {
114 dev_err(dev, "set rtc alarm failed, ret %d\n", ret);
115 return ret;
116 }
117
118 ret = imx_sc_rtc_alarm_irq_enable(dev, alrm->enabled);
119 if (ret) {
120 dev_err(dev, "enable rtc alarm failed, ret %d\n", ret);
121 return ret;
122 }
123
124 return 0;
125}
126
127static const struct rtc_class_ops imx_sc_rtc_ops = {
128 .read_time = imx_sc_rtc_read_time,
129 .set_time = imx_sc_rtc_set_time,
130 .read_alarm = imx_sc_rtc_read_alarm,
131 .set_alarm = imx_sc_rtc_set_alarm,
132 .alarm_irq_enable = imx_sc_rtc_alarm_irq_enable,
133};
134
135static int imx_sc_rtc_alarm_notify(struct notifier_block *nb,
136 unsigned long event, void *group)
137{
138
139 if (!((event & SC_IRQ_RTC) && (*(u8 *)group == SC_IRQ_GROUP_RTC)))
140 return 0;
141
142 rtc_update_irq(imx_sc_rtc, 1, RTC_IRQF | RTC_AF);
143
144 return 0;
145}
146
147static struct notifier_block imx_sc_rtc_alarm_sc_notifier = {
148 .notifier_call = imx_sc_rtc_alarm_notify,
149};
150
151static int imx_sc_rtc_probe(struct platform_device *pdev)
152{
153 int ret;
154
155 ret = imx_scu_get_handle(&rtc_ipc_handle);
156 if (ret)
157 return ret;
158
159 device_init_wakeup(&pdev->dev, true);
160
161 imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev);
162 if (IS_ERR(imx_sc_rtc))
163 return PTR_ERR(imx_sc_rtc);
164
165 imx_sc_rtc->ops = &imx_sc_rtc_ops;
166 imx_sc_rtc->range_min = 0;
167 imx_sc_rtc->range_max = U32_MAX;
168
169 ret = rtc_register_device(imx_sc_rtc);
170 if (ret) {
171 dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
172 return ret;
173 }
174
175 imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier);
176
177 return 0;
178}
179
180static const struct of_device_id imx_sc_dt_ids[] = {
181 { .compatible = "fsl,imx8qxp-sc-rtc", },
182 {}
183};
184MODULE_DEVICE_TABLE(of, imx_sc_dt_ids);
185
186static struct platform_driver imx_sc_rtc_driver = {
187 .driver = {
188 .name = "imx-sc-rtc",
189 .of_match_table = imx_sc_dt_ids,
190 },
191 .probe = imx_sc_rtc_probe,
192};
193module_platform_driver(imx_sc_rtc_driver);
194
195MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
196MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver");
197MODULE_LICENSE("GPL");
198
