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1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright 2018 NXP. | |
4 | */ | |
5 | ||
13a929f3 | 6 | #include <linux/arm-smccc.h> |
e01b5781 AH |
7 | #include <linux/firmware/imx/sci.h> |
8 | #include <linux/module.h> | |
9 | #include <linux/of.h> | |
10 | #include <linux/platform_device.h> | |
11 | #include <linux/rtc.h> | |
12 | ||
13 | #define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9 | |
14 | #define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6 | |
15 | ||
13a929f3 AH |
16 | #define IMX_SIP_SRTC 0xC2000002 |
17 | #define IMX_SIP_SRTC_SET_TIME 0x0 | |
18 | ||
e01b5781 AH |
19 | static struct imx_sc_ipc *rtc_ipc_handle; |
20 | static struct rtc_device *imx_sc_rtc; | |
21 | ||
22 | struct imx_sc_msg_timer_get_rtc_time { | |
23 | struct imx_sc_rpc_msg hdr; | |
24 | u32 time; | |
25 | } __packed; | |
26 | ||
27 | static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
28 | { | |
29 | struct imx_sc_msg_timer_get_rtc_time msg; | |
30 | struct imx_sc_rpc_msg *hdr = &msg.hdr; | |
31 | int ret; | |
32 | ||
33 | hdr->ver = IMX_SC_RPC_VERSION; | |
34 | hdr->svc = IMX_SC_RPC_SVC_TIMER; | |
35 | hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970; | |
36 | hdr->size = 1; | |
37 | ||
38 | ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true); | |
39 | if (ret) { | |
40 | dev_err(dev, "read rtc time failed, ret %d\n", ret); | |
41 | return ret; | |
42 | } | |
43 | ||
30adde6b | 44 | rtc_time64_to_tm(msg.time, tm); |
e01b5781 AH |
45 | |
46 | return 0; | |
47 | } | |
48 | ||
13a929f3 AH |
49 | static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm) |
50 | { | |
51 | struct arm_smccc_res res; | |
52 | ||
53 | /* pack 2 time parameters into 1 register, 16 bits for each */ | |
54 | arm_smccc_smc(IMX_SIP_SRTC, IMX_SIP_SRTC_SET_TIME, | |
55 | ((tm->tm_year + 1900) << 16) | (tm->tm_mon + 1), | |
56 | (tm->tm_mday << 16) | tm->tm_hour, | |
57 | (tm->tm_min << 16) | tm->tm_sec, | |
58 | 0, 0, 0, &res); | |
59 | ||
60 | return res.a0; | |
61 | } | |
62 | ||
e01b5781 AH |
63 | static const struct rtc_class_ops imx_sc_rtc_ops = { |
64 | .read_time = imx_sc_rtc_read_time, | |
13a929f3 | 65 | .set_time = imx_sc_rtc_set_time, |
e01b5781 AH |
66 | }; |
67 | ||
68 | static int imx_sc_rtc_probe(struct platform_device *pdev) | |
69 | { | |
70 | int ret; | |
71 | ||
72 | ret = imx_scu_get_handle(&rtc_ipc_handle); | |
73 | if (ret) | |
74 | return ret; | |
75 | ||
76 | imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev); | |
77 | if (IS_ERR(imx_sc_rtc)) | |
78 | return PTR_ERR(imx_sc_rtc); | |
79 | ||
80 | imx_sc_rtc->ops = &imx_sc_rtc_ops; | |
81 | imx_sc_rtc->range_min = 0; | |
82 | imx_sc_rtc->range_max = U32_MAX; | |
83 | ||
84 | ret = rtc_register_device(imx_sc_rtc); | |
85 | if (ret) { | |
86 | dev_err(&pdev->dev, "failed to register rtc: %d\n", ret); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static const struct of_device_id imx_sc_dt_ids[] = { | |
94 | { .compatible = "fsl,imx8qxp-sc-rtc", }, | |
95 | {} | |
96 | }; | |
97 | MODULE_DEVICE_TABLE(of, imx_sc_dt_ids); | |
98 | ||
99 | static struct platform_driver imx_sc_rtc_driver = { | |
100 | .driver = { | |
101 | .name = "imx-sc-rtc", | |
102 | .of_match_table = imx_sc_dt_ids, | |
103 | }, | |
104 | .probe = imx_sc_rtc_probe, | |
105 | }; | |
106 | module_platform_driver(imx_sc_rtc_driver); | |
107 | ||
108 | MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); | |
109 | MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver"); | |
110 | MODULE_LICENSE("GPL"); |