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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-19 05:18:03 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-19 05:18:03 +0300
commitb0b3a37b908b5906524c11f3ca12cd7c9d4adc1c (patch)
tree1fd9e48f602bef936322b6bc526db7ffa80bda09 /drivers/rtc/rtc-jz4740.c
parent3be134e5152f08e8bd3c2afdaac723f64d93c2bb (diff)
parentd3e5925902dc0f639efc3641e07fca2bd7af5441 (diff)
downloadlinux-b0b3a37b908b5906524c11f3ca12cd7c9d4adc1c.tar.xz
Merge tag 'rtc-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni: "Subsystem: - non-modular drivers are now explicitly non-modular New driver: - Epson Toyocom rtc-7301sf/dg Drivers: - cmos: reject unsupported alarm values wrt the RTC capabilities - ds1307: ACPI support - jz4740: DT support, jz4780 handling, can now be used as a system power controller - mcp795: many fixes, in particular proper month handling - twl: driver is now DT only" * tag 'rtc-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (31 commits) rtc: mcp795: Fix whitespace and indentation. rtc: mcp795: Prefer using the BIT() macro. rtc: mcp795: fix month write resetting date to 1. rtc: mcp795: fix time range difference between linux and RTC chip. rtc: mcp795: fix bitmask value for leap year (LP). rtc: mcp795: use bcd2bin/bin2bcd. rtc: add support for EPSON TOYOCOM RTC-7301SF/DG rtc: ds1307: Add ACPI support rtc: imxdi: (trivial) fix a typo rtc: ds1374: Merge conditional + WARN_ON() rtc: twl: make driver DT only rtc: twl: kill static variables rtc: fix typos in Kconfig rtc: jz4740: make the driver builtin only rtc: jz4740: remove unused EXPORT_SYMBOL Documentation: bindings: fix twl-rtc documentation rtc: Enable compile testing for Maxim and Samsung drivers MIPS: jz4740: Remove obsolete code MIPS: qi_lb60: Probe RTC driver from DT and use it as power controller MIPS: jz4740: DTS: Probe the jz4740-rtc driver from devicetree ...
Diffstat (limited to 'drivers/rtc/rtc-jz4740.c')
-rw-r--r--drivers/rtc/rtc-jz4740.c154
1 files changed, 143 insertions, 11 deletions
diff --git a/drivers/rtc/rtc-jz4740.c b/drivers/rtc/rtc-jz4740.c
index 5e14651b71a8..72918c1ba092 100644
--- a/drivers/rtc/rtc-jz4740.c
+++ b/drivers/rtc/rtc-jz4740.c
@@ -14,10 +14,12 @@
*
*/
+#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/reboot.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -27,8 +29,14 @@
#define JZ_REG_RTC_SEC_ALARM 0x08
#define JZ_REG_RTC_REGULATOR 0x0C
#define JZ_REG_RTC_HIBERNATE 0x20
+#define JZ_REG_RTC_WAKEUP_FILTER 0x24
+#define JZ_REG_RTC_RESET_COUNTER 0x28
#define JZ_REG_RTC_SCRATCHPAD 0x34
+/* The following are present on the jz4780 */
+#define JZ_REG_RTC_WENR 0x3C
+#define JZ_RTC_WENR_WEN BIT(31)
+
#define JZ_RTC_CTRL_WRDY BIT(7)
#define JZ_RTC_CTRL_1HZ BIT(6)
#define JZ_RTC_CTRL_1HZ_IRQ BIT(5)
@@ -37,16 +45,34 @@
#define JZ_RTC_CTRL_AE BIT(2)
#define JZ_RTC_CTRL_ENABLE BIT(0)
+/* Magic value to enable writes on jz4780 */
+#define JZ_RTC_WENR_MAGIC 0xA55A
+
+#define JZ_RTC_WAKEUP_FILTER_MASK 0x0000FFE0
+#define JZ_RTC_RESET_COUNTER_MASK 0x00000FE0
+
+enum jz4740_rtc_type {
+ ID_JZ4740,
+ ID_JZ4780,
+};
+
struct jz4740_rtc {
void __iomem *base;
+ enum jz4740_rtc_type type;
struct rtc_device *rtc;
+ struct clk *clk;
int irq;
spinlock_t lock;
+
+ unsigned int min_wakeup_pin_assert_time;
+ unsigned int reset_pin_assert_time;
};
+static struct device *dev_for_power_off;
+
static inline uint32_t jz4740_rtc_reg_read(struct jz4740_rtc *rtc, size_t reg)
{
return readl(rtc->base + reg);
@@ -64,11 +90,33 @@ static int jz4740_rtc_wait_write_ready(struct jz4740_rtc *rtc)
return timeout ? 0 : -EIO;
}
+static inline int jz4780_rtc_enable_write(struct jz4740_rtc *rtc)
+{
+ uint32_t ctrl;
+ int ret, timeout = 1000;
+
+ ret = jz4740_rtc_wait_write_ready(rtc);
+ if (ret != 0)
+ return ret;
+
+ writel(JZ_RTC_WENR_MAGIC, rtc->base + JZ_REG_RTC_WENR);
+
+ do {
+ ctrl = readl(rtc->base + JZ_REG_RTC_WENR);
+ } while (!(ctrl & JZ_RTC_WENR_WEN) && --timeout);
+
+ return timeout ? 0 : -EIO;
+}
+
static inline int jz4740_rtc_reg_write(struct jz4740_rtc *rtc, size_t reg,
uint32_t val)
{
- int ret;
- ret = jz4740_rtc_wait_write_ready(rtc);
+ int ret = 0;
+
+ if (rtc->type >= ID_JZ4780)
+ ret = jz4780_rtc_enable_write(rtc);
+ if (ret == 0)
+ ret = jz4740_rtc_wait_write_ready(rtc);
if (ret == 0)
writel(val, rtc->base + reg);
@@ -203,12 +251,57 @@ static irqreturn_t jz4740_rtc_irq(int irq, void *data)
return IRQ_HANDLED;
}
-void jz4740_rtc_poweroff(struct device *dev)
+static void jz4740_rtc_poweroff(struct device *dev)
{
struct jz4740_rtc *rtc = dev_get_drvdata(dev);
jz4740_rtc_reg_write(rtc, JZ_REG_RTC_HIBERNATE, 1);
}
-EXPORT_SYMBOL_GPL(jz4740_rtc_poweroff);
+
+static void jz4740_rtc_power_off(void)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev_for_power_off);
+ unsigned long rtc_rate;
+ unsigned long wakeup_filter_ticks;
+ unsigned long reset_counter_ticks;
+
+ clk_prepare_enable(rtc->clk);
+
+ rtc_rate = clk_get_rate(rtc->clk);
+
+ /*
+ * Set minimum wakeup pin assertion time: 100 ms.
+ * Range is 0 to 2 sec if RTC is clocked at 32 kHz.
+ */
+ wakeup_filter_ticks =
+ (rtc->min_wakeup_pin_assert_time * rtc_rate) / 1000;
+ if (wakeup_filter_ticks < JZ_RTC_WAKEUP_FILTER_MASK)
+ wakeup_filter_ticks &= JZ_RTC_WAKEUP_FILTER_MASK;
+ else
+ wakeup_filter_ticks = JZ_RTC_WAKEUP_FILTER_MASK;
+ jz4740_rtc_reg_write(rtc,
+ JZ_REG_RTC_WAKEUP_FILTER, wakeup_filter_ticks);
+
+ /*
+ * Set reset pin low-level assertion time after wakeup: 60 ms.
+ * Range is 0 to 125 ms if RTC is clocked at 32 kHz.
+ */
+ reset_counter_ticks = (rtc->reset_pin_assert_time * rtc_rate) / 1000;
+ if (reset_counter_ticks < JZ_RTC_RESET_COUNTER_MASK)
+ reset_counter_ticks &= JZ_RTC_RESET_COUNTER_MASK;
+ else
+ reset_counter_ticks = JZ_RTC_RESET_COUNTER_MASK;
+ jz4740_rtc_reg_write(rtc,
+ JZ_REG_RTC_RESET_COUNTER, reset_counter_ticks);
+
+ jz4740_rtc_poweroff(dev_for_power_off);
+ machine_halt();
+}
+
+static const struct of_device_id jz4740_rtc_of_match[] = {
+ { .compatible = "ingenic,jz4740-rtc", .data = (void *)ID_JZ4740 },
+ { .compatible = "ingenic,jz4780-rtc", .data = (void *)ID_JZ4780 },
+ {},
+};
static int jz4740_rtc_probe(struct platform_device *pdev)
{
@@ -216,11 +309,20 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
struct jz4740_rtc *rtc;
uint32_t scratchpad;
struct resource *mem;
+ const struct platform_device_id *id = platform_get_device_id(pdev);
+ const struct of_device_id *of_id = of_match_device(
+ jz4740_rtc_of_match, &pdev->dev);
+ struct device_node *np = pdev->dev.of_node;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
+ if (of_id)
+ rtc->type = (enum jz4740_rtc_type)of_id->data;
+ else
+ rtc->type = id->driver_data;
+
rtc->irq = platform_get_irq(pdev, 0);
if (rtc->irq < 0) {
dev_err(&pdev->dev, "Failed to get platform irq\n");
@@ -232,6 +334,12 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
if (IS_ERR(rtc->base))
return PTR_ERR(rtc->base);
+ rtc->clk = devm_clk_get(&pdev->dev, "rtc");
+ if (IS_ERR(rtc->clk)) {
+ dev_err(&pdev->dev, "Failed to get RTC clock\n");
+ return PTR_ERR(rtc->clk);
+ }
+
spin_lock_init(&rtc->lock);
platform_set_drvdata(pdev, rtc);
@@ -263,6 +371,27 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
}
}
+ if (np && of_device_is_system_power_controller(np)) {
+ if (!pm_power_off) {
+ /* Default: 60ms */
+ rtc->reset_pin_assert_time = 60;
+ of_property_read_u32(np, "reset-pin-assert-time-ms",
+ &rtc->reset_pin_assert_time);
+
+ /* Default: 100ms */
+ rtc->min_wakeup_pin_assert_time = 100;
+ of_property_read_u32(np,
+ "min-wakeup-pin-assert-time-ms",
+ &rtc->min_wakeup_pin_assert_time);
+
+ dev_for_power_off = &pdev->dev;
+ pm_power_off = jz4740_rtc_power_off;
+ } else {
+ dev_warn(&pdev->dev,
+ "Poweroff handler already present!\n");
+ }
+ }
+
return 0;
}
@@ -295,17 +424,20 @@ static const struct dev_pm_ops jz4740_pm_ops = {
#define JZ4740_RTC_PM_OPS NULL
#endif /* CONFIG_PM */
+static const struct platform_device_id jz4740_rtc_ids[] = {
+ { "jz4740-rtc", ID_JZ4740 },
+ { "jz4780-rtc", ID_JZ4780 },
+ {}
+};
+
static struct platform_driver jz4740_rtc_driver = {
.probe = jz4740_rtc_probe,
.driver = {
.name = "jz4740-rtc",
.pm = JZ4740_RTC_PM_OPS,
+ .of_match_table = of_match_ptr(jz4740_rtc_of_match),
},
+ .id_table = jz4740_rtc_ids,
};
-module_platform_driver(jz4740_rtc_driver);
-
-MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("RTC driver for the JZ4740 SoC\n");
-MODULE_ALIAS("platform:jz4740-rtc");
+builtin_platform_driver(jz4740_rtc_driver);