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Message-Id: <1635834123-24668-2-git-send-email-vincent.shih@sunplus.com>
Date: Tue, 2 Nov 2021 14:22:02 +0800
From: Vincent Shih <vincent.sunplus@...il.com>
To: a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
p.zabel@...gutronix.de, linux-kernel@...r.kernel.org,
linux-rtc@...r.kernel.org, robh+dt@...nel.org,
devicetree@...r.kernel.org
Cc: Vincent Shih <vincent.shih@...plus.com>
Subject: [PATCH 1/2] rtc: Add driver for Sunplus SP7021
Add driver for Sunplus SP7021
Signed-off-by: Vincent Shih <vincent.shih@...plus.com>
---
MAINTAINERS | 6 +
drivers/rtc/Kconfig | 10 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-sunplus.c | 389 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 406 insertions(+)
create mode 100644 drivers/rtc/rtc-sunplus.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 3b79fd4..6c1a535 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17945,6 +17945,12 @@ L: netdev@...r.kernel.org
S: Maintained
F: drivers/net/ethernet/dlink/sundance.c
+SUNPLUS RTC DRIVER
+M: Vincent Shih <vincent.shih@...plus.com>
+L: linux-rtc@...r.kernel.org
+S: Maintained
+F: drivers/rtc/rtc-sunplus.c
+
SUPERH
M: Yoshinori Sato <ysato@...rs.sourceforge.jp>
M: Rich Felker <dalias@...c.org>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e1bc521..0c205d2 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1028,6 +1028,16 @@ config RTC_DRV_DS1685_FAMILY
This driver can also be built as a module. If so, the module
will be called rtc-ds1685.
+config RTC_DRV_SUNPLUS
+ bool "Sunplus SP7021 RTC"
+ depends on SOC_SP7021
+ help
+ Say 'yse' to get support for Sunplus SP7021 real-time clock
+ (RTC) for industrial applications.
+ It provides RTC status check, timer/alarm functionalities,
+ user data reservation only with battery with voltage over 2.5V,
+ RTC power status check and battery charge.
+
choice
prompt "Subtype"
depends on RTC_DRV_DS1685_FAMILY
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 5ceeafe..92039b3 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -165,6 +165,7 @@ obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o
obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
obj-$(CONFIG_RTC_DRV_SUN6I) += rtc-sun6i.o
obj-$(CONFIG_RTC_DRV_SUNXI) += rtc-sunxi.o
+obj-$(CONFIG_RTC_DRV_SUNPLUS) += rtc-sunplus.o
obj-$(CONFIG_RTC_DRV_TEGRA) += rtc-tegra.o
obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
obj-$(CONFIG_RTC_DRV_TPS6586X) += rtc-tps6586x.o
diff --git a/drivers/rtc/rtc-sunplus.c b/drivers/rtc/rtc-sunplus.c
new file mode 100644
index 0000000..6d87ab6
--- /dev/null
+++ b/drivers/rtc/rtc-sunplus.c
@@ -0,0 +1,389 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/**************************************************************************************************/
+/* How to test RTC: */
+/* */
+/* 1. use kernel commands */
+/* hwclock - query and set the hardware clock (RTC) */
+/* */
+/* (for i in `seq 5`; do (echo ------ && echo -n 'date : ' && date && echo -n 'hwclock -r: ' */
+/* && hwclock -r; sleep 1); done) */
+/* date 121209002014 # Set system to 2014/Dec/12 09:00 */
+/* (for i in `seq 5`; do (echo ------ && echo -n 'date : ' && date && echo -n 'hwclock -r: ' */
+/* && hwclock -r; sleep 1); done) */
+/* hwclock -s # Set the System Time from the Hardware Clock */
+/* (for i in `seq 5`; do (echo ------ && echo -n 'date : ' && date && echo -n 'hwclock -r: ' */
+/* && hwclock -r; sleep 1); done) */
+/* date 121213002014 # Set system to 2014/Dec/12 13:00 */
+/* (for i in `seq 5`; do (echo ------ && echo -n 'date : ' && date && echo -n 'hwclock -r: ' */
+/* && hwclock -r; sleep 1); done) */
+/* hwclock -w # Set the Hardware Clock to the current System Time */
+/* (for i in `seq 10000`; do (echo ------ && echo -n 'date : ' && date && echo -n 'hwclock -r: ' */
+/* && hwclock -r; sleep 1); done) */
+/* */
+/* How to setup alarm (e.g., 10 sec later): */
+/* echo 0 > /sys/class/rtc/rtc0/wakealarm && nnn=`date '+%s'` && echo $nnn && \ */
+/* nnn=`expr $nnn + 10` && echo $nnn > /sys/class/rtc/rtc0/wakealarm */
+/* */
+/* 2. use RTC Driver Test Program (\linux\application\module_test\rtc\rtc-test.c) */
+/* */
+/**************************************************************************************************/
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/of.h>
+#include <linux/ktime.h>
+#include <linux/io.h>
+
+/* ---------------------------------------------------------------------------------------------- */
+#define FUNC_DEBUG() pr_debug("[RTC] Debug: %s(%d)\n", __func__, __LINE__)
+
+#define RTC_DEBUG(fmt, args ...) pr_debug("[RTC] Debug: " fmt, ## args)
+#define RTC_INFO(fmt, args ...) pr_info("[RTC] Info: " fmt, ## args)
+#define RTC_WARN(fmt, args ...) pr_warn("[RTC] Warning: " fmt, ## args)
+#define RTC_ERR(fmt, args ...) pr_err("[RTC] Error: " fmt, ## args)
+/* ---------------------------------------------------------------------------------------------- */
+
+struct sunplus_rtc {
+ struct clk *rtcclk;
+ struct reset_control *rstc;
+ unsigned long set_alarm_again;
+ u32 charging_mode;
+};
+
+struct sunplus_rtc sp_rtc;
+
+#define RTC_REG_NAME "rtc_reg"
+
+struct sp_rtc_reg {
+ unsigned int rsv00;
+ unsigned int rsv01;
+ unsigned int rsv02;
+ unsigned int rsv03;
+ unsigned int rsv04;
+ unsigned int rsv05;
+ unsigned int rsv06;
+ unsigned int rsv07;
+ unsigned int rsv08;
+ unsigned int rsv09;
+ unsigned int rsv10;
+ unsigned int rsv11;
+ unsigned int rsv12;
+ unsigned int rsv13;
+ unsigned int rsv14;
+ unsigned int rsv15;
+ unsigned int rtc_ctrl;
+ unsigned int rtc_timer_out;
+ unsigned int rtc_divider;
+ unsigned int rtc_timer_set;
+ unsigned int rtc_alarm_set;
+ unsigned int rtc_user_data;
+ unsigned int rtc_reset_record;
+ unsigned int rtc_battery_ctrl;
+ unsigned int rtc_trim_ctrl;
+ unsigned int rsv25;
+ unsigned int rsv26;
+ unsigned int rsv27;
+ unsigned int rsv28;
+ unsigned int rsv29;
+ unsigned int rsv30;
+ unsigned int rsv31;
+};
+
+static struct sp_rtc_reg *rtc_reg_ptr;
+
+static void sp_get_seconds(unsigned long *secs)
+{
+ *secs = (unsigned long)readl(&rtc_reg_ptr->rtc_timer_out);
+}
+
+static void sp_set_seconds(unsigned long secs)
+{
+ writel((u32)secs, &rtc_reg_ptr->rtc_timer_set);
+}
+
+static int sp_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ unsigned long secs;
+
+ sp_get_seconds(&secs);
+ rtc_time64_to_tm(secs, tm);
+ RTC_DEBUG("%s: RTC date/time to %d-%d-%d, %02d:%02d:%02d.\r\n",
+ __func__, tm->tm_mday, tm->tm_mon + 1, tm->tm_year,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ return rtc_valid_tm(tm);
+}
+
+int sp_rtc_get_time(struct rtc_time *tm)
+{
+ unsigned long secs;
+
+ sp_get_seconds(&secs);
+ rtc_time64_to_tm(secs, tm);
+ return 0;
+}
+EXPORT_SYMBOL(sp_rtc_get_time);
+
+static int sp_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ FUNC_DEBUG();
+
+ // Keep RTC from system reset
+ writel((1 << (16+4)) | (1 << 4), &rtc_reg_ptr->rtc_ctrl);
+
+ return 0;
+}
+
+static int sp_rtc_resume(struct platform_device *pdev)
+{
+ /* */
+ /* Because RTC is still powered during suspend, */
+ /* there is nothing to do here. */
+ /* */
+ FUNC_DEBUG();
+
+ // Keep RTC from system reset
+ writel((1 << (16+4)) | (1 << 4), &rtc_reg_ptr->rtc_ctrl);
+
+ return 0;
+}
+
+static int sp_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ unsigned long secs;
+
+ secs = rtc_tm_to_time64(tm);
+ RTC_DEBUG("%s, secs = %lu\n", __func__, secs);
+ sp_set_seconds(secs);
+
+ return 0;
+}
+
+static int sp_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct rtc_device *rtc = dev_get_drvdata(dev);
+ unsigned long alarm_time;
+
+ alarm_time = rtc_tm_to_time64(&alrm->time);
+ RTC_DEBUG("%s, alarm_time: %u\n", __func__, (u32)(alarm_time));
+
+ if (alarm_time > 0xFFFFFFFF)
+ return -EINVAL;
+
+ if ((rtc->aie_timer.enabled) && (rtc->aie_timer.node.expires == ktime_set(alarm_time, 0))) {
+ if (rtc->uie_rtctimer.enabled)
+ sp_rtc.set_alarm_again = 1;
+ }
+
+ writel((u32)alarm_time, &rtc_reg_ptr->rtc_alarm_set);
+ wmb(); // make sure settings are effective.
+
+ // enable alarm for update irq
+ if (rtc->uie_rtctimer.enabled)
+ writel((0x003F << 16) | 0x17, &rtc_reg_ptr->rtc_ctrl);
+ else if (!rtc->aie_timer.enabled)
+ writel((0x0007 << 16) | 0x0, &rtc_reg_ptr->rtc_ctrl);
+
+ return 0;
+}
+
+static int sp_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ unsigned int alarm_time;
+
+ alarm_time = readl(&rtc_reg_ptr->rtc_alarm_set);
+ RTC_DEBUG("%s, alarm_time: %u\n", __func__, alarm_time);
+ rtc_time64_to_tm((unsigned long)(alarm_time), &alrm->time);
+
+ return 0;
+}
+
+static int sp_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct rtc_device *rtc = dev_get_drvdata(dev);
+
+ if (enabled)
+ writel((0x003F << 16) | 0x17, &rtc_reg_ptr->rtc_ctrl);
+ else if (!rtc->uie_rtctimer.enabled)
+ writel((0x0007 << 16) | 0x0, &rtc_reg_ptr->rtc_ctrl);
+
+ return 0;
+}
+
+static const struct rtc_class_ops sp_rtc_ops = {
+ .read_time = sp_rtc_read_time,
+ .set_time = sp_rtc_set_time,
+ .set_alarm = sp_rtc_set_alarm,
+ .read_alarm = sp_rtc_read_alarm,
+ .alarm_irq_enable = sp_rtc_alarm_irq_enable,
+};
+
+static irqreturn_t rtc_irq_handler(int irq, void *dev_id)
+{
+ struct platform_device *plat_dev = dev_id;
+ struct rtc_device *rtc = platform_get_drvdata(plat_dev);
+
+ if (rtc->uie_rtctimer.enabled) {
+ rtc_update_irq(rtc, 1, RTC_IRQF | RTC_UF);
+ RTC_DEBUG("[RTC] update irq\n");
+
+ if (sp_rtc.set_alarm_again == 1) {
+ sp_rtc.set_alarm_again = 0;
+ rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+ RTC_DEBUG("[RTC] alarm irq\n");
+ }
+ } else {
+ rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+ RTC_DEBUG("[RTC] alarm irq\n");
+ }
+
+ return IRQ_HANDLED;
+}
+
+/* ---------------------------------------------------------------------------------------------- */
+/* mode bat_charge_rsel bat_charge_dsel bat_charge_en Remarks */
+/* 0xE x x 0 Disable */
+/* 0x1 0 0 1 0.86mA (2K Ohm with diode) */
+/* 0x5 1 0 1 1.81mA (250 Ohm with diode) */
+/* 0x9 2 0 1 2.07mA (50 Ohm with diode) */
+/* 0xD 3 0 1 16.0mA (0 Ohm with diode) */
+/* 0x3 0 1 1 1.36mA (2K Ohm without diode) */
+/* 0x7 1 1 1 3.99mA (250 Ohm without diode) */
+/* 0xB 2 1 1 4.41mA (50 Ohm without diode) */
+/* 0xF 3 1 1 16.0mA (0 Ohm without diode) */
+/* ---------------------------------------------------------------------------------------------- */
+static void sp_rtc_set_batt_charge_ctrl(u32 _mode)
+{
+ u8 m = _mode & 0x000F;
+
+ RTC_DEBUG("battery charge mode: 0x%X\n", m);
+ writel((0x000F << 16) | m, &rtc_reg_ptr->rtc_battery_ctrl);
+}
+
+static int sp_rtc_probe(struct platform_device *plat_dev)
+{
+ int ret;
+ int err, irq;
+ struct rtc_device *rtc = NULL;
+ struct resource *res;
+ void __iomem *reg_base = NULL;
+
+ FUNC_DEBUG();
+
+ memset(&sp_rtc, 0, sizeof(sp_rtc));
+
+ // find and map our resources
+ res = platform_get_resource_byname(plat_dev, IORESOURCE_MEM, RTC_REG_NAME);
+ RTC_DEBUG("res = 0x%x\n", res->start);
+
+ if (res) {
+ reg_base = devm_ioremap_resource(&plat_dev->dev, res);
+ if (IS_ERR(reg_base))
+ RTC_ERR("%s devm_ioremap_resource fail\n", RTC_REG_NAME);
+ }
+ RTC_DEBUG("reg_base = 0x%lx\n", (unsigned long)reg_base);
+
+ // clk
+ sp_rtc.rtcclk = devm_clk_get(&plat_dev->dev, NULL);
+ RTC_DEBUG("sp_rtc->clk = 0x%lx\n", (unsigned long)sp_rtc.rtcclk);
+ if (IS_ERR(sp_rtc.rtcclk))
+ RTC_DEBUG("devm_clk_get fail\n");
+
+ ret = clk_prepare_enable(sp_rtc.rtcclk);
+
+ // reset
+ sp_rtc.rstc = devm_reset_control_get(&plat_dev->dev, NULL);
+ RTC_DEBUG("sp_rtc->rstc = 0x%lx\n", (unsigned long)sp_rtc.rstc);
+ if (IS_ERR(sp_rtc.rstc)) {
+ ret = PTR_ERR(sp_rtc.rstc);
+ RTC_ERR("SPI failed to retrieve reset controller: %d\n", ret);
+ goto free_clk;
+ }
+
+ ret = reset_control_deassert(sp_rtc.rstc);
+ if (ret)
+ goto free_clk;
+
+ rtc_reg_ptr = (struct sp_rtc_reg *)(reg_base);
+
+ // Keep RTC from system reset
+ writel((1 << (16+4)) | (1 << 4), &rtc_reg_ptr->rtc_ctrl);
+
+ // request irq
+ irq = platform_get_irq(plat_dev, 0);
+ if (irq < 0) {
+ RTC_ERR("platform_get_irq failed\n");
+ goto free_reset_assert;
+ }
+
+ err = devm_request_irq(&plat_dev->dev, irq, rtc_irq_handler,
+ IRQF_TRIGGER_RISING, "rtc irq", plat_dev);
+ if (err) {
+ RTC_ERR("devm_request_irq failed: %d\n", err);
+ goto free_reset_assert;
+ }
+
+ // Get charging-mode.
+ ret = of_property_read_u32(plat_dev->dev.of_node, "charging-mode", &sp_rtc.charging_mode);
+ if (ret) {
+ RTC_ERR("Failed to retrieve \'charging-mode\'!\n");
+ goto free_reset_assert;
+ }
+ sp_rtc_set_batt_charge_ctrl(sp_rtc.charging_mode);
+
+ device_init_wakeup(&plat_dev->dev, 1);
+
+ rtc = devm_rtc_device_register(&plat_dev->dev, "sp7021-rtc", &sp_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc)) {
+ ret = PTR_ERR(rtc);
+ goto free_reset_assert;
+ }
+
+ platform_set_drvdata(plat_dev, rtc);
+
+ RTC_INFO("sp7021-rtc loaded\n");
+
+ return 0;
+
+free_reset_assert:
+ reset_control_assert(sp_rtc.rstc);
+free_clk:
+ clk_disable_unprepare(sp_rtc.rtcclk);
+
+ return ret;
+}
+
+static int sp_rtc_remove(struct platform_device *plat_dev)
+{
+ reset_control_assert(sp_rtc.rstc);
+
+ return 0;
+}
+
+static const struct of_device_id sp_rtc_of_match[] = {
+ { .compatible = "sunplus,sp7021-rtc" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sp_rtc_of_match);
+
+static struct platform_driver sp_rtc_driver = {
+ .probe = sp_rtc_probe,
+ .remove = sp_rtc_remove,
+ .suspend = sp_rtc_suspend,
+ .resume = sp_rtc_resume,
+ .driver = {
+ .name = "sp7021-rtc",
+ .owner = THIS_MODULE,
+ .of_match_table = sp_rtc_of_match,
+ },
+};
+module_platform_driver(sp_rtc_driver);
+
+MODULE_AUTHOR("Vincent Shih <vincent.shih@...plus.com>");
+MODULE_DESCRIPTION("Sunplus RTC driver");
+MODULE_LICENSE("GPL v2");
+
--
2.7.4
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