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e01b5781 AH |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright 2018 NXP. | |
4 | */ | |
5 | ||
a3094fc1 | 6 | #include <dt-bindings/firmware/imx/rsrc.h> |
13a929f3 | 7 | #include <linux/arm-smccc.h> |
e01b5781 AH |
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 | |
a3094fc1 | 15 | #define IMX_SC_TIMER_FUNC_SET_RTC_ALARM 8 |
e01b5781 AH |
16 | #define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6 |
17 | ||
13a929f3 AH |
18 | #define IMX_SIP_SRTC 0xC2000002 |
19 | #define IMX_SIP_SRTC_SET_TIME 0x0 | |
20 | ||
a3094fc1 AH |
21 | #define SC_IRQ_GROUP_RTC 2 |
22 | #define SC_IRQ_RTC 1 | |
23 | ||
e01b5781 AH |
24 | static struct imx_sc_ipc *rtc_ipc_handle; |
25 | static struct rtc_device *imx_sc_rtc; | |
26 | ||
27 | struct imx_sc_msg_timer_get_rtc_time { | |
28 | struct imx_sc_rpc_msg hdr; | |
29 | u32 time; | |
30 | } __packed; | |
31 | ||
a3094fc1 AH |
32 | struct 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 | ||
e01b5781 AH |
42 | static 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 | ||
30adde6b | 59 | rtc_time64_to_tm(msg.time, tm); |
e01b5781 AH |
60 | |
61 | return 0; | |
62 | } | |
63 | ||
13a929f3 AH |
64 | static 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 | ||
a3094fc1 AH |
78 | static 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 | ||
83 | static int imx_sc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
84 | { | |
85 | /* | |
86 | * SCU firmware does NOT provide read alarm API, but .read_alarm | |
87 | * callback is required by RTC framework to support alarm function, | |
88 | * so just return here. | |
89 | */ | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static 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 | ||
e01b5781 AH |
127 | static const struct rtc_class_ops imx_sc_rtc_ops = { |
128 | .read_time = imx_sc_rtc_read_time, | |
13a929f3 | 129 | .set_time = imx_sc_rtc_set_time, |
a3094fc1 AH |
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 | ||
135 | static int imx_sc_rtc_alarm_notify(struct notifier_block *nb, | |
136 | unsigned long event, void *group) | |
137 | { | |
138 | /* ignore non-rtc irq */ | |
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 | ||
147 | static struct notifier_block imx_sc_rtc_alarm_sc_notifier = { | |
148 | .notifier_call = imx_sc_rtc_alarm_notify, | |
e01b5781 AH |
149 | }; |
150 | ||
151 | static 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 | ||
a3094fc1 AH |
159 | device_init_wakeup(&pdev->dev, true); |
160 | ||
e01b5781 AH |
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 | ||
a3094fc1 AH |
175 | imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier); |
176 | ||
e01b5781 AH |
177 | return 0; |
178 | } | |
179 | ||
180 | static const struct of_device_id imx_sc_dt_ids[] = { | |
181 | { .compatible = "fsl,imx8qxp-sc-rtc", }, | |
182 | {} | |
183 | }; | |
184 | MODULE_DEVICE_TABLE(of, imx_sc_dt_ids); | |
185 | ||
186 | static 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 | }; | |
193 | module_platform_driver(imx_sc_rtc_driver); | |
194 | ||
195 | MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); | |
196 | MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver"); | |
197 | MODULE_LICENSE("GPL"); |