diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/rtc/rtc-imx-sc.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-imx-sc.c b/drivers/rtc/rtc-imx-sc.c new file mode 100644 index 000000000..814d51664 --- /dev/null +++ b/drivers/rtc/rtc-imx-sc.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2018 NXP. + */ + +#include <dt-bindings/firmware/imx/rsrc.h> +#include <linux/arm-smccc.h> +#include <linux/firmware/imx/sci.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/rtc.h> + +#define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9 +#define IMX_SC_TIMER_FUNC_SET_RTC_ALARM 8 +#define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6 + +#define IMX_SIP_SRTC 0xC2000002 +#define IMX_SIP_SRTC_SET_TIME 0x0 + +#define SC_IRQ_GROUP_RTC 2 +#define SC_IRQ_RTC 1 + +static struct imx_sc_ipc *rtc_ipc_handle; +static struct rtc_device *imx_sc_rtc; + +struct imx_sc_msg_timer_get_rtc_time { + struct imx_sc_rpc_msg hdr; + u32 time; +} __packed; + +struct imx_sc_msg_timer_rtc_set_alarm { + struct imx_sc_rpc_msg hdr; + u16 year; + u8 mon; + u8 day; + u8 hour; + u8 min; + u8 sec; +} __packed __aligned(4); + +static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct imx_sc_msg_timer_get_rtc_time msg; + struct imx_sc_rpc_msg *hdr = &msg.hdr; + int ret; + + hdr->ver = IMX_SC_RPC_VERSION; + hdr->svc = IMX_SC_RPC_SVC_TIMER; + hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970; + hdr->size = 1; + + ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true); + if (ret) { + dev_err(dev, "read rtc time failed, ret %d\n", ret); + return ret; + } + + rtc_time64_to_tm(msg.time, tm); + + return 0; +} + +static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct arm_smccc_res res; + + /* pack 2 time parameters into 1 register, 16 bits for each */ + arm_smccc_smc(IMX_SIP_SRTC, IMX_SIP_SRTC_SET_TIME, + ((tm->tm_year + 1900) << 16) | (tm->tm_mon + 1), + (tm->tm_mday << 16) | tm->tm_hour, + (tm->tm_min << 16) | tm->tm_sec, + 0, 0, 0, &res); + + return res.a0; +} + +static int imx_sc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) +{ + return imx_scu_irq_group_enable(SC_IRQ_GROUP_RTC, SC_IRQ_RTC, enable); +} + +static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct imx_sc_msg_timer_rtc_set_alarm msg; + struct imx_sc_rpc_msg *hdr = &msg.hdr; + int ret; + struct rtc_time *alrm_tm = &alrm->time; + + hdr->ver = IMX_SC_RPC_VERSION; + hdr->svc = IMX_SC_RPC_SVC_TIMER; + hdr->func = IMX_SC_TIMER_FUNC_SET_RTC_ALARM; + hdr->size = 3; + + msg.year = alrm_tm->tm_year + 1900; + msg.mon = alrm_tm->tm_mon + 1; + msg.day = alrm_tm->tm_mday; + msg.hour = alrm_tm->tm_hour; + msg.min = alrm_tm->tm_min; + msg.sec = alrm_tm->tm_sec; + + ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true); + if (ret) { + dev_err(dev, "set rtc alarm failed, ret %d\n", ret); + return ret; + } + + ret = imx_sc_rtc_alarm_irq_enable(dev, alrm->enabled); + if (ret) { + dev_err(dev, "enable rtc alarm failed, ret %d\n", ret); + return ret; + } + + return 0; +} + +static const struct rtc_class_ops imx_sc_rtc_ops = { + .read_time = imx_sc_rtc_read_time, + .set_time = imx_sc_rtc_set_time, + .set_alarm = imx_sc_rtc_set_alarm, + .alarm_irq_enable = imx_sc_rtc_alarm_irq_enable, +}; + +static int imx_sc_rtc_alarm_notify(struct notifier_block *nb, + unsigned long event, void *group) +{ + /* ignore non-rtc irq */ + if (!((event & SC_IRQ_RTC) && (*(u8 *)group == SC_IRQ_GROUP_RTC))) + return 0; + + rtc_update_irq(imx_sc_rtc, 1, RTC_IRQF | RTC_AF); + + return 0; +} + +static struct notifier_block imx_sc_rtc_alarm_sc_notifier = { + .notifier_call = imx_sc_rtc_alarm_notify, +}; + +static int imx_sc_rtc_probe(struct platform_device *pdev) +{ + int ret; + + ret = imx_scu_get_handle(&rtc_ipc_handle); + if (ret) + return ret; + + device_init_wakeup(&pdev->dev, true); + + imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(imx_sc_rtc)) + return PTR_ERR(imx_sc_rtc); + + imx_sc_rtc->ops = &imx_sc_rtc_ops; + imx_sc_rtc->range_min = 0; + imx_sc_rtc->range_max = U32_MAX; + + ret = devm_rtc_register_device(imx_sc_rtc); + if (ret) + return ret; + + imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier); + + return 0; +} + +static const struct of_device_id imx_sc_dt_ids[] = { + { .compatible = "fsl,imx8qxp-sc-rtc", }, + {} +}; +MODULE_DEVICE_TABLE(of, imx_sc_dt_ids); + +static struct platform_driver imx_sc_rtc_driver = { + .driver = { + .name = "imx-sc-rtc", + .of_match_table = imx_sc_dt_ids, + }, + .probe = imx_sc_rtc_probe, +}; +module_platform_driver(imx_sc_rtc_driver); + +MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); +MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver"); +MODULE_LICENSE("GPL"); |