[U-Boot] [PATCH v2] watchdog: tangier: Convert to use WDT class
Andy Shevchenko
andriy.shevchenko at linux.intel.com
Wed Jun 12 17:28:21 UTC 2019
Convert legacy driver to use watchdog class.
Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
---
- dropped redundant assignments (Stefan)
- used clamp_t() instead of max_t()/min_t() pair
arch/x86/cpu/tangier/Kconfig | 1 -
arch/x86/dts/edison.dts | 4 ++
configs/edison_defconfig | 2 +
drivers/watchdog/Kconfig | 17 ++++----
drivers/watchdog/Makefile | 2 +-
drivers/watchdog/tangier_wdt.c | 73 +++++++++++++++++++++-------------
6 files changed, 60 insertions(+), 39 deletions(-)
diff --git a/arch/x86/cpu/tangier/Kconfig b/arch/x86/cpu/tangier/Kconfig
index a3bd16799d..d2b7edecd6 100644
--- a/arch/x86/cpu/tangier/Kconfig
+++ b/arch/x86/cpu/tangier/Kconfig
@@ -10,7 +10,6 @@ config INTEL_TANGIER
imply MMC_SDHCI
imply MMC_SDHCI_SDMA
imply MMC_SDHCI_TANGIER
- imply TANGIER_WATCHDOG
imply USB
imply USB_DWC3
diff --git a/arch/x86/dts/edison.dts b/arch/x86/dts/edison.dts
index e8564bbb8a..c0487656d3 100644
--- a/arch/x86/dts/edison.dts
+++ b/arch/x86/dts/edison.dts
@@ -104,6 +104,10 @@
reg = <0xff009000 0x1000>;
};
+ watchdog: wdt at 0 {
+ compatible = "intel,tangier-wdt";
+ };
+
reset {
compatible = "intel,reset-tangier";
u-boot,dm-pre-reloc;
diff --git a/configs/edison_defconfig b/configs/edison_defconfig
index 840c87ac5a..468754493e 100644
--- a/configs/edison_defconfig
+++ b/configs/edison_defconfig
@@ -39,5 +39,7 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x8087
CONFIG_USB_GADGET_PRODUCT_NUM=0x0a99
CONFIG_USB_GADGET_DOWNLOAD=y
# CONFIG_USB_HOST_ETHER is not set
+CONFIG_WDT=y
+CONFIG_WDT_TANGIER=y
CONFIG_FAT_WRITE=y
CONFIG_SHA1=y
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index b01dbc446d..2270ed2e39 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -34,15 +34,6 @@ config OMAP_WATCHDOG
help
Say Y here to enable the OMAP3+ watchdog driver.
-config TANGIER_WATCHDOG
- bool "Intel Tangier watchdog"
- depends on INTEL_MID
- select HW_WATCHDOG
- help
- This enables support for watchdog controller available on
- Intel Tangier SoC. If you're using a board with Intel Tangier
- SoC, say Y here.
-
config ULP_WATCHDOG
bool "i.MX7ULP watchdog"
help
@@ -161,4 +152,12 @@ config WDT_MPC8xx
help
Select this to enable mpc8xx watchdog timer
+config WDT_TANGIER
+ bool "Intel Tangier watchdog timer support"
+ depends on WDT && INTEL_MID
+ help
+ This enables support for watchdog controller available on
+ Intel Tangier SoC. If you're using a board with Intel Tangier
+ SoC, say Y here.
+
endmenu
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 6f20e73810..2dfc8a37b0 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -14,7 +14,6 @@ obj-$(CONFIG_S5P) += s5p_wdt.o
obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o
-obj-$(CONFIG_TANGIER_WATCHDOG) += tangier_wdt.o
obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o
obj-$(CONFIG_WDT) += wdt-uclass.o
obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o
@@ -28,3 +27,4 @@ obj-$(CONFIG_WDT_MPC8xx) += mpc8xx_wdt.o
obj-$(CONFIG_WDT_MT7621) += mt7621_wdt.o
obj-$(CONFIG_WDT_MTK) += mtk_wdt.o
obj-$(CONFIG_WDT_SP805) += sp805_wdt.o
+obj-$(CONFIG_WDT_TANGIER) += tangier_wdt.o
diff --git a/drivers/watchdog/tangier_wdt.c b/drivers/watchdog/tangier_wdt.c
index be4a8f467a..21238dffa2 100644
--- a/drivers/watchdog/tangier_wdt.c
+++ b/drivers/watchdog/tangier_wdt.c
@@ -3,7 +3,9 @@
* Copyright (c) 2017 Intel Corporation
*/
#include <common.h>
-#include <watchdog.h>
+#include <dm.h>
+#include <wdt.h>
+#include <div64.h>
#include <asm/scu.h>
/* Hardware timeout in seconds */
@@ -12,12 +14,6 @@
#define WDT_TIMEOUT_MAX 170
#define WDT_DEFAULT_TIMEOUT 90
-#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
-#define WATCHDOG_HEARTBEAT 60000
-#else
-#define WATCHDOG_HEARTBEAT CONFIG_WATCHDOG_TIMEOUT_MSECS
-#endif
-
enum {
SCU_WATCHDOG_START = 0,
SCU_WATCHDOG_STOP = 1,
@@ -25,39 +21,33 @@ enum {
SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT = 3,
};
-void hw_watchdog_reset(void)
+static int tangier_wdt_reset(struct udevice *dev)
{
- static unsigned long last;
- unsigned long now;
-
- if (gd->timer)
- now = timer_get_us();
- else
- now = rdtsc() / 1000;
-
- /* Do not flood SCU */
- if (last > now)
- last = 0;
-
- if (unlikely((now - last) > (WDT_PRETIMEOUT / 2) * 1000000)) {
- last = now;
- scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
- }
+ scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
+ return 0;
}
-int hw_watchdog_disable(void)
+static int tangier_wdt_stop(struct udevice *dev)
{
return scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_STOP);
}
-void hw_watchdog_init(void)
+static int tangier_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
{
- u32 timeout = WATCHDOG_HEARTBEAT / 1000;
+ u32 timeout_sec;
int in_size;
struct ipc_wd_start {
u32 pretimeout;
u32 timeout;
- } ipc_wd_start = { timeout - WDT_PRETIMEOUT, timeout };
+ } ipc_wd_start;
+
+ /* Calculate timeout in seconds and restrict to min and max value */
+ do_div(timeout_ms, 1000);
+ timeout_sec = clamp_t(u32, timeout_ms, WDT_TIMEOUT_MIN, WDT_TIMEOUT_MAX);
+
+ /* Update values in the IPC request */
+ ipc_wd_start.pretimeout = timeout_sec - WDT_PRETIMEOUT;
+ ipc_wd_start.timeout = timeout_sec;
/*
* SCU expects the input size for watchdog IPC
@@ -67,4 +57,31 @@ void hw_watchdog_init(void)
scu_ipc_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_START,
(u32 *)&ipc_wd_start, in_size, NULL, 0);
+
+ return 0;
+}
+
+static const struct wdt_ops tangier_wdt_ops = {
+ .reset = tangier_wdt_reset,
+ .start = tangier_wdt_start,
+ .stop = tangier_wdt_stop,
+};
+
+static const struct udevice_id tangier_wdt_ids[] = {
+ { .compatible = "intel,tangier-wdt" },
+ { /* sentinel */ }
+};
+
+static int tangier_wdt_probe(struct udevice *dev)
+{
+ debug("%s: Probing wdt%u\n", __func__, dev->seq);
+ return 0;
}
+
+U_BOOT_DRIVER(wdt_tangier) = {
+ .name = "wdt_tangier",
+ .id = UCLASS_WDT,
+ .of_match = tangier_wdt_ids,
+ .ops = &tangier_wdt_ops,
+ .probe = tangier_wdt_probe,
+};
--
2.20.1
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