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arm: at91: wdt: Convert watchdog driver to dm/dt

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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>
This commit is contained in:
Prasanthi Chellakumar 2018-10-09 11:46:40 -07:00 committed by Tom Rini
parent eb13dddd2c
commit 1473f6ac88
19 changed files with 114 additions and 51 deletions
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1
arch/arm/dts/at91sam9260-smartweb.dts
View file

@ -89,6 +89,7 @@
};
watchdog@fffffd40 {
timeout-sec = <15>;
status = "okay";
};

1
arch/arm/dts/at91sam9g20-taurus.dts
View file

@ -98,6 +98,7 @@
};
watchdog@fffffd40 {
timeout-sec = <15>;
status = "okay";
};

6
arch/arm/mach-at91/include/mach/at91_wdt.h
View file

@ -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

2
arch/arm/mach-at91/spl.c
View file

@ -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;

2
arch/arm/mach-at91/spl_at91.c
View file

@ -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

2
arch/arm/mach-at91/spl_atmel.c
View file

@ -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

2
common/board_f.c
View file

@ -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();

4
configs/picosam9g45_defconfig
View file

@ -40,3 +40,7 @@ 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

3
configs/smartweb_defconfig
View file

@ -59,3 +59,6 @@ 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

3
configs/taurus_defconfig
View file

@ -61,3 +61,6 @@ 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

2
doc/README.at91
View file

@ -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.

2
doc/README.watchdog
View file

@ -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

10
drivers/watchdog/Kconfig
View file

@ -118,4 +118,14 @@ config IMX_WATCHDOG
Select this to enable the IMX and LSCH2 of Layerscape watchdog
driver.
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

2
drivers/watchdog/Makefile
View file

@ -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

104
drivers/watchdog/at91sam9_wdt.c
View file

@ -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;
}
void hw_watchdog_reset(void)
static int at91_wdt_stop(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);
/* Disable Watchdog Timer */
priv->regval |= AT91_WDT_MR_WDDIS;
writel(priv->regval, priv->regs + AT91_WDT_MR);
return 0;
}
void hw_watchdog_init(void)
static int at91_wdt_reset(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);
writel(AT91_WDT_CR_WDRSTT | AT91_WDT_CR_KEY, priv->regs + AT91_WDT_CR);
return 0;
}
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)
{
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,
};

4
include/configs/picosam9g45.h
View file

@ -57,10 +57,6 @@
*/
#define CONFIG_BOOTP_BOOTFILESIZE
/* Enable the watchdog */
#define CONFIG_AT91SAM9_WATCHDOG
#define CONFIG_HW_WATCHDOG
/*
* Command line configuration.
*/

7
include/configs/smartweb.h
View file

@ -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

7
include/configs/taurus.h
View file

@ -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

1
scripts/config_whitelist.txt
View file

@ -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