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Message-Id: <1457217531-26064-1-git-send-email-paul@crapouillou.net>
Date: Sat, 5 Mar 2016 23:38:47 +0100
From: Paul Cercueil <paul@...pouillou.net>
To: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Ralf Baechle <ralf@...ux-mips.org>,
Alessandro Zummo <a.zummo@...ertech.it>,
Paul Cercueil <paul@...pouillou.net>,
Paul Burton <paul.burton@...tec.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mips@...ux-mips.org, rtc-linux@...glegroups.com
Subject: [PATCH 1/5] rtc: rtc-jz4740: Add support for the RTC in the jz4780 SoC
Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
drivers/rtc/Kconfig | 6 +++---
drivers/rtc/rtc-jz4740.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 51 insertions(+), 5 deletions(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e593c55..b322f08 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1494,10 +1494,10 @@ config RTC_DRV_MPC5121
config RTC_DRV_JZ4740
tristate "Ingenic JZ4740 SoC"
- depends on MACH_JZ4740 || COMPILE_TEST
+ depends on MACH_INGENIC || COMPILE_TEST
help
- If you say yes here you get support for the Ingenic JZ4740 SoC RTC
- controller.
+ If you say yes here you get support for the Ingenic JZ47xx SoCs RTC
+ controllers.
This driver can also be buillt as a module. If so, the module
will be called rtc-jz4740.
diff --git a/drivers/rtc/rtc-jz4740.c b/drivers/rtc/rtc-jz4740.c
index b2bcfc0..47617bd 100644
--- a/drivers/rtc/rtc-jz4740.c
+++ b/drivers/rtc/rtc-jz4740.c
@@ -29,6 +29,10 @@
#define JZ_REG_RTC_HIBERNATE 0x20
#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)
@@ -37,8 +41,17 @@
#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
+
+enum jz4740_rtc_type {
+ ID_JZ4740,
+ ID_JZ4780,
+};
+
struct jz4740_rtc {
void __iomem *base;
+ enum jz4740_rtc_type type;
struct rtc_device *rtc;
@@ -64,11 +77,33 @@ 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);
@@ -216,11 +251,14 @@ 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);
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
+ 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");
@@ -295,12 +333,20 @@ 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},
+ {}
+};
+MODULE_DEVICE_TABLE(platform, jz4740_rtc_ids);
+
static struct platform_driver jz4740_rtc_driver = {
.probe = jz4740_rtc_probe,
.driver = {
.name = "jz4740-rtc",
.pm = JZ4740_RTC_PM_OPS,
},
+ .id_table = jz4740_rtc_ids,
};
module_platform_driver(jz4740_rtc_driver);
--
2.7.0
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