diff mbox series

[V4,2/3] watchdog: designware: Convert to DM and DT probing

Message ID 20200109100604.932881-2-marex@denx.de
State Accepted
Commit cf8c8367884c32844bb002bf6eba02e72a0d75b2
Headers show
Series [V4,1/3] watchdog: designware: Migrate CONFIG_DESIGNWARE_WATCHDOG to Kconfig | expand

Commit Message

Marek Vasut Jan. 9, 2020, 10:06 a.m. UTC 
Convert the designware watchdog timer driver to DM and add DT probing
support. Perform minor coding style clean up, like drop superfluous
braces. These ought to be no functional change.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Chin Liang See <chin.liang.see at intel.com>
Cc: Dalon Westergreen <dwesterg at gmail.com>
Cc: Dinh Nguyen <dinguyen at kernel.org>
Cc: Jagan Teki <jagan at amarulasolutions.com>
Cc: Ley Foon Tan <ley.foon.tan at intel.com>
Cc: Philipp Tomisch <philipp.tomisch at theobroma-systems.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
Cc: Tien Fong Chee <tien.fong.chee at intel.com>
Reviewed-by: Jagan Teki <jagan at amarulasolutions.com>
Tested-by: Jagan Teki <jagan at amarulasolutions.com> # roc-rk3399-pc
---
V2: - Support both DM and non-DM probing
    - Fix watchdog stop handling by setting CR bit
V3: - Add missing u-boot,dm-pre-reloc into the DTs
V4: - Rebase on u-boot/master
---
 .../socfpga_cyclone5_vining_fpga-u-boot.dtsi  |   4 +
 .../dts/socfpga_stratix10_socdk-u-boot.dtsi   |   4 +
 configs/socfpga_stratix10_defconfig           |   2 +
 configs/socfpga_vining_fpga_defconfig         |   1 +
 drivers/watchdog/Kconfig                      |   2 +-
 drivers/watchdog/designware_wdt.c             | 122 ++++++++++++++----
 include/configs/socfpga_soc64_common.h        |   1 +
 7 files changed, 112 insertions(+), 24 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm/dts/socfpga_cyclone5_vining_fpga-u-boot.dtsi b/arch/arm/dts/socfpga_cyclone5_vining_fpga-u-boot.dtsi
index 44bedd8b67..2e4468e8d8 100644
--- a/arch/arm/dts/socfpga_cyclone5_vining_fpga-u-boot.dtsi
+++ b/arch/arm/dts/socfpga_cyclone5_vining_fpga-u-boot.dtsi
@@ -56,3 +56,7 @@ 
 &portc {
 	bank-name = "portc";
 };
+
+&watchdog0 {
+	u-boot,dm-pre-reloc;
+};
diff --git a/arch/arm/dts/socfpga_stratix10_socdk-u-boot.dtsi b/arch/arm/dts/socfpga_stratix10_socdk-u-boot.dtsi
index 38855aecd7..a903040d60 100755
--- a/arch/arm/dts/socfpga_stratix10_socdk-u-boot.dtsi
+++ b/arch/arm/dts/socfpga_stratix10_socdk-u-boot.dtsi
@@ -31,3 +31,7 @@ 
 &sysmgr {
 	u-boot,dm-pre-reloc;
 };
+
+&watchdog0 {
+	u-boot,dm-pre-reloc;
+};
diff --git a/configs/socfpga_stratix10_defconfig b/configs/socfpga_stratix10_defconfig
index 82ffedf41a..29466d0c09 100644
--- a/configs/socfpga_stratix10_defconfig
+++ b/configs/socfpga_stratix10_defconfig
@@ -60,3 +60,5 @@  CONFIG_USB_DWC2=y
 CONFIG_USB_STORAGE=y
 # CONFIG_SPL_USE_TINY_PRINTF is not set
 CONFIG_DESIGNWARE_WATCHDOG=y
+CONFIG_WDT=y
+# CONFIG_SPL_WDT is not set
diff --git a/configs/socfpga_vining_fpga_defconfig b/configs/socfpga_vining_fpga_defconfig
index 0e31e4f165..39be88b9b7 100644
--- a/configs/socfpga_vining_fpga_defconfig
+++ b/configs/socfpga_vining_fpga_defconfig
@@ -97,4 +97,5 @@  CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
 CONFIG_USB_GADGET_DWC2_OTG=y
 CONFIG_USB_GADGET_DOWNLOAD=y
 # CONFIG_SPL_WDT is not set
+CONFIG_WDT=y
 CONFIG_DESIGNWARE_WATCHDOG=y
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 5f8a070ef5..bf5612a811 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -47,7 +47,7 @@  config ULP_WATCHDOG
 
 config DESIGNWARE_WATCHDOG
 	bool "Designware watchdog timer support"
-	select HW_WATCHDOG
+	select HW_WATCHDOG if !WDT
 	help
 	   Enable this to support Designware Watchdog Timer IP, present e.g.
 	   on Altera SoCFPGA SoCs.
diff --git a/drivers/watchdog/designware_wdt.c b/drivers/watchdog/designware_wdt.c
index c668567c66..a7b735979a 100644
--- a/drivers/watchdog/designware_wdt.c
+++ b/drivers/watchdog/designware_wdt.c
@@ -4,7 +4,8 @@ 
  */
 
 #include <common.h>
-#include <watchdog.h>
+#include <dm.h>
+#include <wdt.h>
 #include <asm/io.h>
 #include <asm/utils.h>
 
@@ -17,46 +18,51 @@ 
 #define DW_WDT_CR_RMOD_VAL	0x00
 #define DW_WDT_CRR_RESTART_VAL	0x76
 
+struct designware_wdt_priv {
+	void __iomem	*base;
+};
+
 /*
  * Set the watchdog time interval.
  * Counter is 32 bit.
  */
-static int designware_wdt_settimeout(unsigned int timeout)
+static int designware_wdt_settimeout(void __iomem *base, unsigned int clk_khz,
+				     unsigned int timeout)
 {
 	signed int i;
 
 	/* calculate the timeout range value */
-	i = (log_2_n_round_up(timeout * CONFIG_DW_WDT_CLOCK_KHZ)) - 16;
-	if (i > 15)
-		i = 15;
-	if (i < 0)
-		i = 0;
+	i = log_2_n_round_up(timeout * clk_khz) - 16;
+	i = clamp(i, 0, 15);
+
+	writel(i | (i << 4), base + DW_WDT_TORR);
 
-	writel((i | (i << 4)), (CONFIG_DW_WDT_BASE + DW_WDT_TORR));
 	return 0;
 }
 
-static void designware_wdt_enable(void)
+static void designware_wdt_enable(void __iomem *base)
 {
-	writel(((DW_WDT_CR_RMOD_VAL << DW_WDT_CR_RMOD_OFFSET) |
-	      (0x1 << DW_WDT_CR_EN_OFFSET)),
-	      (CONFIG_DW_WDT_BASE + DW_WDT_CR));
+	writel((DW_WDT_CR_RMOD_VAL << DW_WDT_CR_RMOD_OFFSET) |
+		BIT(DW_WDT_CR_EN_OFFSET),
+		base + DW_WDT_CR);
 }
 
-static unsigned int designware_wdt_is_enabled(void)
+static unsigned int designware_wdt_is_enabled(void __iomem *base)
 {
-	unsigned long val;
-	val = readl((CONFIG_DW_WDT_BASE + DW_WDT_CR));
-	return val & 0x1;
+	return readl(base + DW_WDT_CR) & BIT(0);
 }
 
-#if defined(CONFIG_HW_WATCHDOG)
-void hw_watchdog_reset(void)
+static void designware_wdt_reset_common(void __iomem *base)
 {
-	if (designware_wdt_is_enabled())
+	if (designware_wdt_is_enabled(base))
 		/* restart the watchdog counter */
-		writel(DW_WDT_CRR_RESTART_VAL,
-		       (CONFIG_DW_WDT_BASE + DW_WDT_CRR));
+		writel(DW_WDT_CRR_RESTART_VAL, base + DW_WDT_CRR);
+}
+
+#if !CONFIG_IS_ENABLED(WDT)
+void hw_watchdog_reset(void)
+{
+	designware_wdt_reset_common((void __iomem *)CONFIG_DW_WDT_BASE);
 }
 
 void hw_watchdog_init(void)
@@ -64,10 +70,80 @@  void hw_watchdog_init(void)
 	/* reset to disable the watchdog */
 	hw_watchdog_reset();
 	/* set timer in miliseconds */
-	designware_wdt_settimeout(CONFIG_WATCHDOG_TIMEOUT_MSECS);
+	designware_wdt_settimeout((void __iomem *)CONFIG_DW_WDT_BASE,
+				  CONFIG_DW_WDT_CLOCK_KHZ,
+				  CONFIG_WATCHDOG_TIMEOUT_MSECS);
 	/* enable the watchdog */
-	designware_wdt_enable();
+	designware_wdt_enable((void __iomem *)CONFIG_DW_WDT_BASE);
 	/* reset the watchdog */
 	hw_watchdog_reset();
 }
+#else
+static int designware_wdt_reset(struct udevice *dev)
+{
+	struct designware_wdt_priv *priv = dev_get_priv(dev);
+
+	designware_wdt_reset_common(priv->base);
+
+	return 0;
+}
+
+static int designware_wdt_stop(struct udevice *dev)
+{
+	struct designware_wdt_priv *priv = dev_get_priv(dev);
+
+	designware_wdt_reset(dev);
+	writel(DW_WDT_CR_RMOD_VAL << DW_WDT_CR_RMOD_OFFSET,
+		priv->base + DW_WDT_CR);
+
+	return 0;
+}
+
+static int designware_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
+{
+	struct designware_wdt_priv *priv = dev_get_priv(dev);
+
+	designware_wdt_stop(dev);
+
+	/* set timer in miliseconds */
+	designware_wdt_settimeout(priv->base, CONFIG_DW_WDT_CLOCK_KHZ, timeout);
+
+	designware_wdt_enable(priv->base);
+
+	/* reset the watchdog */
+	return designware_wdt_reset(dev);
+}
+
+static int designware_wdt_probe(struct udevice *dev)
+{
+	struct designware_wdt_priv *priv = dev_get_priv(dev);
+
+	priv->base = dev_remap_addr(dev);
+	if (!priv->base)
+		return -EINVAL;
+
+	/* reset to disable the watchdog */
+	return designware_wdt_stop(dev);
+}
+
+static const struct wdt_ops designware_wdt_ops = {
+	.start = designware_wdt_start,
+	.reset = designware_wdt_reset,
+	.stop = designware_wdt_stop,
+};
+
+static const struct udevice_id designware_wdt_ids[] = {
+	{ .compatible = "snps,dw-wdt"},
+	{}
+};
+
+U_BOOT_DRIVER(designware_wdt) = {
+	.name = "designware_wdt",
+	.id = UCLASS_WDT,
+	.of_match = designware_wdt_ids,
+	.priv_auto_alloc_size = sizeof(struct designware_wdt_priv),
+	.probe = designware_wdt_probe,
+	.ops = &designware_wdt_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
 #endif
diff --git a/include/configs/socfpga_soc64_common.h b/include/configs/socfpga_soc64_common.h
index ac7c005055..da81137e84 100644
--- a/include/configs/socfpga_soc64_common.h
+++ b/include/configs/socfpga_soc64_common.h
@@ -151,6 +151,7 @@  unsigned int cm_get_qspi_controller_clk_hz(void);
  * L4 Watchdog
  */
 #ifdef CONFIG_SPL_BUILD
+#undef CONFIG_WATCHDOG
 #define CONFIG_HW_WATCHDOG
 #else
 #undef CONFIG_HW_WATCHDOG