Convert the Watchdog driver for AT91SAM9x processors to support the driver model and device tree. Changes "CONFIG_AT91SAM9_WATCHDOG" to new "CONFIG_WDT_AT91" Kconfig option.

Signed-off-by: Prasanthi Chellakumar prasanthi.chellakumar@microchip.com --- arch/arm/dts/at91sam9260-smartweb.dts | 1 + arch/arm/dts/at91sam9g20-taurus.dts | 1 + arch/arm/mach-at91/include/mach/at91_wdt.h | 6 +- arch/arm/mach-at91/spl.c | 2 +- arch/arm/mach-at91/spl_at91.c | 2 +- arch/arm/mach-at91/spl_atmel.c | 2 +- common/board_f.c | 2 +- configs/picosam9g45_defconfig | 4 ++ configs/smartweb_defconfig | 3 + configs/taurus_defconfig | 3 + doc/README.at91 | 2 +- doc/README.watchdog | 2 +- drivers/watchdog/Kconfig | 10 +++ drivers/watchdog/Makefile | 2 +- drivers/watchdog/at91sam9_wdt.c | 104 ++++++++++++++++++++++------- include/configs/picosam9g45.h | 4 -- include/configs/smartweb.h | 7 -- include/configs/taurus.h | 7 -- scripts/config_whitelist.txt | 1 - 19 files changed, 114 insertions(+), 51 deletions(-)

diff --git a/arch/arm/dts/at91sam9260-smartweb.dts b/arch/arm/dts/at91sam9260-smartweb.dts index e59781b..a22de2d 100644 --- a/arch/arm/dts/at91sam9260-smartweb.dts +++ b/arch/arm/dts/at91sam9260-smartweb.dts @@ -89,6 +89,7 @@ };

watchdog@fffffd40 { + timeout-sec = <15>; status = "okay"; };

diff --git a/arch/arm/dts/at91sam9g20-taurus.dts b/arch/arm/dts/at91sam9g20-taurus.dts index 7931c0a..cee228b 100644 --- a/arch/arm/dts/at91sam9g20-taurus.dts +++ b/arch/arm/dts/at91sam9g20-taurus.dts @@ -98,6 +98,7 @@ };

watchdog@fffffd40 { + timeout-sec = <15>; status = "okay"; };

diff --git a/arch/arm/mach-at91/include/mach/at91_wdt.h b/arch/arm/mach-at91/include/mach/at91_wdt.h index 99b0cc8..cd22723 100644 --- a/arch/arm/mach-at91/include/mach/at91_wdt.h +++ b/arch/arm/mach-at91/include/mach/at91_wdt.h @@ -4,7 +4,7 @@ * * Copyright (C) 2008 Jean-Christophe PLAGNIOL-VILLARD plagnioj@jcrosoft.com * Copyright (C) 2007 Andrew Victor - * Copyright (C) 2007 Atmel Corporation. + * Copyright (C) 2018 Microchip Technology Inc. * * Watchdog Timer (WDT) - System peripherals regsters. * Based on AT91SAM9261 datasheet revision D. @@ -27,9 +27,13 @@ typedef struct at91_wdt {

#endif

+/* Watchdog Control Register */ +#define AT91_WDT_CR 0x00 #define AT91_WDT_CR_WDRSTT 1 #define AT91_WDT_CR_KEY 0xa5000000 /* KEY Password */

+/* Watchdog Mode Register*/ +#define AT91_WDT_MR 0X04 #define AT91_WDT_MR_WDV(x) (x & 0xfff) #define AT91_WDT_MR_WDFIEN 0x00001000 #define AT91_WDT_MR_WDRSTEN 0x00002000 diff --git a/arch/arm/mach-at91/spl.c b/arch/arm/mach-at91/spl.c index 8bfb2a4..6da6d41 100644 --- a/arch/arm/mach-at91/spl.c +++ b/arch/arm/mach-at91/spl.c @@ -11,7 +11,7 @@ #include <asm/arch/clk.h> #include <spl.h>

-#if !defined(CONFIG_AT91SAM9_WATCHDOG) +#if !defined(CONFIG_WDT_AT91) void at91_disable_wdt(void) { struct at91_wdt *wdt = (struct at91_wdt *)ATMEL_BASE_WDT; diff --git a/arch/arm/mach-at91/spl_at91.c b/arch/arm/mach-at91/spl_at91.c index 8c36804..23ebaa9 100644 --- a/arch/arm/mach-at91/spl_at91.c +++ b/arch/arm/mach-at91/spl_at91.c @@ -76,7 +76,7 @@ void __weak spl_board_init(void) void board_init_f(ulong dummy) { lowlevel_clock_init(); -#if !defined(CONFIG_AT91SAM9_WATCHDOG) +#if !defined(CONFIG_WDT_AT91) at91_disable_wdt(); #endif

diff --git a/arch/arm/mach-at91/spl_atmel.c b/arch/arm/mach-at91/spl_atmel.c index 597ff8c..ef745c9 100644 --- a/arch/arm/mach-at91/spl_atmel.c +++ b/arch/arm/mach-at91/spl_atmel.c @@ -98,7 +98,7 @@ void board_init_f(ulong dummy) configure_2nd_sram_as_l2_cache(); #endif

-#if !defined(CONFIG_AT91SAM9_WATCHDOG) +#if !defined(CONFIG_WDT_AT91) /* disable watchdog */ at91_disable_wdt(); #endif diff --git a/common/board_f.c b/common/board_f.c index 213d044..02223db 100644 --- a/common/board_f.c +++ b/common/board_f.c @@ -91,7 +91,7 @@ static int init_func_watchdog_init(void) { # if defined(CONFIG_HW_WATCHDOG) && \ (defined(CONFIG_M68K) || defined(CONFIG_MICROBLAZE) || \ - defined(CONFIG_SH) || defined(CONFIG_AT91SAM9_WATCHDOG) || \ + defined(CONFIG_SH) || \ defined(CONFIG_DESIGNWARE_WATCHDOG) || \ defined(CONFIG_IMX_WATCHDOG)) hw_watchdog_init(); diff --git a/configs/picosam9g45_defconfig b/configs/picosam9g45_defconfig index 0b6234f..be9cb5c 100644 --- a/configs/picosam9g45_defconfig +++ b/configs/picosam9g45_defconfig @@ -39,3 +39,7 @@ CONFIG_USB_EHCI_HCD=y CONFIG_USB_STORAGE=y CONFIG_LCD=y CONFIG_OF_LIBFDT=y +CONFIG_DM=y +CONFIG_SPL_DM=y +CONFIG_WDT=y +CONFIG_WDT_AT91=y diff --git a/configs/smartweb_defconfig b/configs/smartweb_defconfig index b0bb18a..3204211 100644 --- a/configs/smartweb_defconfig +++ b/configs/smartweb_defconfig @@ -60,3 +60,6 @@ CONFIG_USB_ETHER_ASIX=y CONFIG_USB_ETHER_MCS7830=y CONFIG_SPL_TINY_MEMSET=y # CONFIG_EFI_LOADER is not set +CONFIG_WDT=y +CONFIG_WDT_AT91=y +CONFIG_AT91_HW_WDT_TIMEOUT=y diff --git a/configs/taurus_defconfig b/configs/taurus_defconfig index bafd8ab..8925d85 100644 --- a/configs/taurus_defconfig +++ b/configs/taurus_defconfig @@ -62,3 +62,6 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0908 CONFIG_USB_GADGET_PRODUCT_NUM=0x02d2 CONFIG_USB_GADGET_DOWNLOAD=y CONFIG_USE_TINY_PRINTF=y +CONFIG_WDT=y +CONFIG_WDT_AT91=y +CONFIG_AT91_HW_WDT_TIMEOUT=y diff --git a/doc/README.at91 b/doc/README.at91 index 6741213..39dd563 100644 --- a/doc/README.at91 +++ b/doc/README.at91 @@ -171,4 +171,4 @@ III. Watchdog support your code (make sure not to disable it in AT91Bootstrap for instance).

In the U-Boot configuration, the AT91 watchdog support is enabled using - the CONFIG_AT91SAM9_WATCHDOG and CONFIG_HW_WATCHDOG options. + the CONFIG_WDT and CONFIG_WDT_AT91 options. diff --git a/doc/README.watchdog b/doc/README.watchdog index 7097c87..f23c923 100644 --- a/doc/README.watchdog +++ b/doc/README.watchdog @@ -14,7 +14,7 @@ CONFIG_WATCHDOG_TIMEOUT_MSECS If not given, will default to maximum timeout. This would be 128000 msec for i.mx31/35/5x/6x.

-CONFIG_AT91SAM9_WATCHDOG +CONFIG_WDT_AT91 Available for AT91SAM9 to service the watchdog.

CONFIG_FTWDT010_WATCHDOG diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index d545b3e..276d6c4 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -111,4 +111,14 @@ config XILINX_TB_WATCHDOG Select this to enable Xilinx Axi watchdog timer, which can be found on some Xilinx Microblaze Platforms.

+config WDT_AT91 + bool "AT91 watchdog timer support" + depends on WDT + help + Select this to enable Microchip watchdog timer, which can be found on + some AT91 devices. + +config AT91_HW_WDT_TIMEOUT + bool "AT91 watchdog timeout specified" + depends on WDT_AT91 endmenu diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 08406ca..a5c27b0 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -3,7 +3,7 @@ # (C) Copyright 2008 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.

-obj-$(CONFIG_AT91SAM9_WATCHDOG) += at91sam9_wdt.o +obj-$(CONFIG_WDT_AT91) += at91sam9_wdt.o obj-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o ifneq (,$(filter $(SOC), mx25 mx31 mx35 mx5 mx6 mx7 vf610)) obj-y += imx_watchdog.o diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c index fca2849..13f8772 100644 --- a/drivers/watchdog/at91sam9_wdt.c +++ b/drivers/watchdog/at91sam9_wdt.c @@ -2,7 +2,7 @@ /* * [origin: Linux kernel drivers/watchdog/at91sam9_wdt.c] * - * Watchdog driver for Atmel AT91SAM9x processors. + * Watchdog driver for AT91SAM9x processors. * * Copyright (C) 2008 Jean-Christophe PLAGNIOL-VILLARD plagnioj@jcrosoft.com * Copyright (C) 2008 Renaud CERRATO r.cerrato@til-technologies.fr @@ -14,38 +14,47 @@ * write to this register. Inform Linux to it too */

-#include <common.h> -#include <watchdog.h> -#include <asm/arch/hardware.h> #include <asm/io.h> #include <asm/arch/at91_wdt.h> +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <wdt.h> + +DECLARE_GLOBAL_DATA_PTR;

/* * AT91SAM9 watchdog runs a 12bit counter @ 256Hz, * use this to convert a watchdog - * value from/to milliseconds. + * value from seconds. */ -#define ms_to_ticks(t) (((t << 8) / 1000) - 1) -#define ticks_to_ms(t) (((t + 1) * 1000) >> 8) +#define WDT_SEC2TICKS(s) (((s) << 8) - 1)

/* Hardware timeout in seconds */ -#if !defined(CONFIG_AT91_HW_WDT_TIMEOUT) -#define WDT_HW_TIMEOUT 2 -#else -#define WDT_HW_TIMEOUT CONFIG_AT91_HW_WDT_TIMEOUT -#endif +#define WDT_MAX_TIMEOUT 16 +#define WDT_MIN_TIMEOUT 0 +#define WDT_DEFAULT_TIMEOUT 2 + +struct at91_wdt_priv { + void __iomem *regs; + u32 regval; + u32 timeout; +};

/* * Set the watchdog time interval in 1/256Hz (write-once) * Counter is 12 bit. */ -static int at91_wdt_settimeout(unsigned int timeout) +static int at91_wdt_start(struct udevice *dev, u64 timeout_s, ulong flags) { - unsigned int reg; - at91_wdt_t *wd = (at91_wdt_t *) ATMEL_BASE_WDT; + struct at91_wdt_priv *priv = dev_get_priv(dev); + u32 timeout = WDT_SEC2TICKS(timeout_s); + + if (timeout_s > WDT_MAX_TIMEOUT || timeout_s < WDT_MIN_TIMEOUT) + timeout = priv->timeout;

/* Check if disabled */ - if (readl(&wd->mr) & AT91_WDT_MR_WDDIS) { + if (readl(priv->regs + AT91_WDT_MR) & AT91_WDT_MR_WDDIS) { printf("sorry, watchdog is disabled\n"); return -1; } @@ -57,24 +66,71 @@ static int at91_wdt_settimeout(unsigned int timeout) * 4096 / 256 = 16 seconds. */

- reg = AT91_WDT_MR_WDRSTEN /* causes watchdog reset */ + priv->regval = AT91_WDT_MR_WDRSTEN /* causes watchdog reset */ | AT91_WDT_MR_WDDBGHLT /* disabled in debug mode */ | AT91_WDT_MR_WDD(0xfff) /* restart at any time */ | AT91_WDT_MR_WDV(timeout); /* timer value */

- writel(reg, &wd->mr); + writel(priv->regval, priv->regs + AT91_WDT_MR); + + return 0; +} + +static int at91_wdt_stop(struct udevice *dev) +{ + struct at91_wdt_priv *priv = dev_get_priv(dev); + + /* Disable Watchdog Timer */ + priv->regval |= AT91_WDT_MR_WDDIS; + writel(priv->regval, priv->regs + AT91_WDT_MR);

return 0; }

-void hw_watchdog_reset(void) +static int at91_wdt_reset(struct udevice *dev) { - at91_wdt_t *wd = (at91_wdt_t *) ATMEL_BASE_WDT; - writel(AT91_WDT_CR_WDRSTT | AT91_WDT_CR_KEY, &wd->cr); + struct at91_wdt_priv *priv = dev_get_priv(dev); + + writel(AT91_WDT_CR_WDRSTT | AT91_WDT_CR_KEY, priv->regs + AT91_WDT_CR); + + return 0; }

-void hw_watchdog_init(void) +static const struct wdt_ops at91_wdt_ops = { + .start = at91_wdt_start, + .stop = at91_wdt_stop, + .reset = at91_wdt_reset, +}; + +static const struct udevice_id at91_wdt_ids[] = { + { .compatible = "atmel,at91sam9260-wdt" }, + {} +}; + +static int at91_wdt_probe(struct udevice *dev) { - /* 16 seconds timer, resets enabled */ - at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000)); + struct at91_wdt_priv *priv = dev_get_priv(dev); + + priv->regs = dev_remap_addr(dev); + if (!priv->regs) + return -EINVAL; + +#ifdef CONFIG_AT91_HW_WDT_TIMEOUT + priv->timeout = dev_read_u32_default(dev, "timeout-sec", + WDT_DEFAULT_TIMEOUT); + debug("%s: timeout %d", __func__, priv->timeout); +#endif + + debug("%s: Probing wdt%u\n", __func__, dev->seq); + + return 0; } + +U_BOOT_DRIVER(at91_wdt) = { + .name = "at91_wdt", + .id = UCLASS_WDT, + .of_match = at91_wdt_ids, + .priv_auto_alloc_size = sizeof(struct at91_wdt_priv), + .ops = &at91_wdt_ops, + .probe = at91_wdt_probe, +}; diff --git a/include/configs/picosam9g45.h b/include/configs/picosam9g45.h index 0b240e7..c2882e6 100644 --- a/include/configs/picosam9g45.h +++ b/include/configs/picosam9g45.h @@ -57,10 +57,6 @@ */ #define CONFIG_BOOTP_BOOTFILESIZE

-/* Enable the watchdog */ -#define CONFIG_AT91SAM9_WATCHDOG -#define CONFIG_HW_WATCHDOG - /* * Command line configuration. */ diff --git a/include/configs/smartweb.h b/include/configs/smartweb.h index 114b87e..28af575 100644 --- a/include/configs/smartweb.h +++ b/include/configs/smartweb.h @@ -112,13 +112,6 @@ "root=/dev/nfs ip=dhcp nfsroot=${serverip}:/srv/nfs/rootfs; " \ "dhcp"

-/* Enable the watchdog */ -#define CONFIG_AT91SAM9_WATCHDOG -#if !defined(CONFIG_SPL_BUILD) -#define CONFIG_HW_WATCHDOG -#endif -#define CONFIG_AT91_HW_WDT_TIMEOUT 15 - #if !defined(CONFIG_SPL_BUILD) /* USB configuration */ #define CONFIG_USB_ATMEL diff --git a/include/configs/taurus.h b/include/configs/taurus.h index 4fdb0dd..f283ab7 100644 --- a/include/configs/taurus.h +++ b/include/configs/taurus.h @@ -85,13 +85,6 @@ #define CONFIG_RMII #define CONFIG_AT91_WANTS_COMMON_PHY

-#define CONFIG_AT91SAM9_WATCHDOG -#define CONFIG_AT91_HW_WDT_TIMEOUT 15 -#if !defined(CONFIG_SPL_BUILD) -/* Enable the watchdog */ -#define CONFIG_HW_WATCHDOG -#endif - /* USB */ #if defined(CONFIG_BOARD_TAURUS) #define CONFIG_USB_ATMEL diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt index e805b1e..72f3d29 100644 --- a/scripts/config_whitelist.txt +++ b/scripts/config_whitelist.txt @@ -82,7 +82,6 @@ CONFIG_AT91SAM9G20EK_2MMC CONFIG_AT91SAM9G45EKES CONFIG_AT91SAM9G45_LCD_BASE CONFIG_AT91SAM9M10G45EK -CONFIG_AT91SAM9_WATCHDOG CONFIG_AT91_CAN CONFIG_AT91_EFLASH CONFIG_AT91_GPIO_PULLUP