Convert legacy driver to use watchdog class.

Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Reviewed-by: Stefan Roese sr@denx.de --- 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@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 b2f40ef057..ba265cf223 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 */ @@ -17,12 +19,6 @@ * the reboot will happen. */

-#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, @@ -30,39 +26,33 @@ 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 @@ -72,4 +62,31 @@ 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, +};