1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright 2024 NXP.
  4 */
  5
  6#include <linux/jiffies.h>
  7#include <linux/module.h>
  8#include <linux/platform_device.h>
  9#include <linux/rtc.h>
 10#include <linux/scmi_protocol.h>
 11#include <linux/scmi_imx_protocol.h>
 12
 13struct scmi_imx_bbm {
 14	const struct scmi_imx_bbm_proto_ops *ops;
 15	struct rtc_device *rtc_dev;
 16	struct scmi_protocol_handle *ph;
 17	struct notifier_block nb;
 18};
 19
 20static int scmi_imx_bbm_read_time(struct device *dev, struct rtc_time *tm)
 21{
 22	struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
 23	struct scmi_protocol_handle *ph = bbnsm->ph;
 24	u64 val;
 25	int ret;
 26
 27	ret = bbnsm->ops->rtc_time_get(ph, 0, &val);
 28	if (ret)
 29		return ret;
 30
 31	rtc_time64_to_tm(val, tm);
 32
 33	return 0;
 34}
 35
 36static int scmi_imx_bbm_set_time(struct device *dev, struct rtc_time *tm)
 37{
 38	struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
 39	struct scmi_protocol_handle *ph = bbnsm->ph;
 40	u64 val;
 41
 42	val = rtc_tm_to_time64(tm);
 43
 44	return bbnsm->ops->rtc_time_set(ph, 0, val);
 45}
 46
 47static int scmi_imx_bbm_alarm_irq_enable(struct device *dev, unsigned int enable)
 48{
 49	struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
 50	struct scmi_protocol_handle *ph = bbnsm->ph;
 51
 52	/* scmi_imx_bbm_set_alarm enables the irq, just handle disable here */
 53	if (!enable)
 54		return bbnsm->ops->rtc_alarm_set(ph, 0, false, 0);
 55
 56	return 0;
 57}
 58
 59static int scmi_imx_bbm_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 60{
 61	struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
 62	struct scmi_protocol_handle *ph = bbnsm->ph;
 63	struct rtc_time *alrm_tm = &alrm->time;
 64	u64 val;
 65
 66	val = rtc_tm_to_time64(alrm_tm);
 67
 68	return bbnsm->ops->rtc_alarm_set(ph, 0, true, val);
 69}
 70
 71static const struct rtc_class_ops smci_imx_bbm_rtc_ops = {
 72	.read_time = scmi_imx_bbm_read_time,
 73	.set_time = scmi_imx_bbm_set_time,
 74	.set_alarm = scmi_imx_bbm_set_alarm,
 75	.alarm_irq_enable = scmi_imx_bbm_alarm_irq_enable,
 76};
 77
 78static int scmi_imx_bbm_rtc_notifier(struct notifier_block *nb, unsigned long event, void *data)
 79{
 80	struct scmi_imx_bbm *bbnsm = container_of(nb, struct scmi_imx_bbm, nb);
 81	struct scmi_imx_bbm_notif_report *r = data;
 82
 83	if (r->is_rtc)
 84		rtc_update_irq(bbnsm->rtc_dev, 1, RTC_AF | RTC_IRQF);
 85	else
 86		pr_err("Unexpected bbm event: %s\n", __func__);
 87
 88	return 0;
 89}
 90
 91static int scmi_imx_bbm_rtc_init(struct scmi_device *sdev)
 92{
 93	const struct scmi_handle *handle = sdev->handle;
 94	struct device *dev = &sdev->dev;
 95	struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
 96	int ret;
 97
 98	bbnsm->rtc_dev = devm_rtc_allocate_device(dev);
 99	if (IS_ERR(bbnsm->rtc_dev))
100		return PTR_ERR(bbnsm->rtc_dev);
101
102	bbnsm->rtc_dev->ops = &smci_imx_bbm_rtc_ops;
103	bbnsm->rtc_dev->range_max = U32_MAX;
104
105	bbnsm->nb.notifier_call = &scmi_imx_bbm_rtc_notifier;
106	ret = handle->notify_ops->devm_event_notifier_register(sdev, SCMI_PROTOCOL_IMX_BBM,
107							       SCMI_EVENT_IMX_BBM_RTC,
108							       NULL, &bbnsm->nb);
109	if (ret)
110		return ret;
111
112	return devm_rtc_register_device(bbnsm->rtc_dev);
113}
114
115static int scmi_imx_bbm_rtc_probe(struct scmi_device *sdev)
116{
117	const struct scmi_handle *handle = sdev->handle;
118	struct device *dev = &sdev->dev;
119	struct scmi_protocol_handle *ph;
120	struct scmi_imx_bbm *bbnsm;
121	int ret;
122
123	if (!handle)
124		return -ENODEV;
125
126	bbnsm = devm_kzalloc(dev, sizeof(*bbnsm), GFP_KERNEL);
127	if (!bbnsm)
128		return -ENOMEM;
129
130	bbnsm->ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_BBM, &ph);
131	if (IS_ERR(bbnsm->ops))
132		return PTR_ERR(bbnsm->ops);
133
134	bbnsm->ph = ph;
135
136	device_init_wakeup(dev, true);
137
138	dev_set_drvdata(dev, bbnsm);
139
140	ret = scmi_imx_bbm_rtc_init(sdev);
141	if (ret)
142		device_init_wakeup(dev, false);
143
144	return ret;
145}
146
147static const struct scmi_device_id scmi_id_table[] = {
148	{ SCMI_PROTOCOL_IMX_BBM, "imx-bbm-rtc" },
149	{ },
150};
151MODULE_DEVICE_TABLE(scmi, scmi_id_table);
152
153static struct scmi_driver scmi_imx_bbm_rtc_driver = {
154	.name = "scmi-imx-bbm-rtc",
155	.probe = scmi_imx_bbm_rtc_probe,
156	.id_table = scmi_id_table,
157};
158module_scmi_driver(scmi_imx_bbm_rtc_driver);
159
160MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
161MODULE_DESCRIPTION("IMX SM BBM RTC driver");
162MODULE_LICENSE("GPL");