diff options
Diffstat (limited to 'board/telit/evk-pro3/barebox-2013.04.0-0002-watchdog-add-at91sam9-watchdog-support.patch')
| -rw-r--r-- | board/telit/evk-pro3/barebox-2013.04.0-0002-watchdog-add-at91sam9-watchdog-support.patch | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/board/telit/evk-pro3/barebox-2013.04.0-0002-watchdog-add-at91sam9-watchdog-support.patch b/board/telit/evk-pro3/barebox-2013.04.0-0002-watchdog-add-at91sam9-watchdog-support.patch new file mode 100644 index 000000000..1ca87695a --- /dev/null +++ b/board/telit/evk-pro3/barebox-2013.04.0-0002-watchdog-add-at91sam9-watchdog-support.patch @@ -0,0 +1,228 @@ +From e1d54ffb987c346c45c20968be34c50c62a91c07 Mon Sep 17 00:00:00 2001 +From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> +Date: Wed, 14 Nov 2012 19:17:47 +0800 +Subject: [PATCH 2/5] watchdog: add at91sam9 watchdog support + +with keep alive support + +Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> +--- + drivers/watchdog/Kconfig | 7 +++ + drivers/watchdog/Makefile | 1 + + drivers/watchdog/at91sam9_wdt.c | 131 ++++++++++++++++++++++++++++++++++++++++ + drivers/watchdog/at91sam9_wdt.h | 38 ++++++++++++ + 4 files changed, 177 insertions(+) + create mode 100644 drivers/watchdog/at91sam9_wdt.c + create mode 100644 drivers/watchdog/at91sam9_wdt.h + +diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig +index 0b4dc84..98a21d7 100644 +--- a/drivers/watchdog/Kconfig ++++ b/drivers/watchdog/Kconfig +@@ -11,6 +11,13 @@ menuconfig WATCHDOG + + if WATCHDOG + ++config WATCHDOG_AT91SAM9X ++ tristate "AT91SAM9X / AT91CAP9 watchdog" ++ depends on ARCH_AT91 ++ help ++ Watchdog timer embedded into AT91SAM9X and AT91CAP9 chips. This will ++ reboot your system when the timeout is reached. ++ + config WATCHDOG_MXS28 + bool "i.MX28" + depends on ARCH_IMX28 +diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile +index f522b88..3d15d52 100644 +--- a/drivers/watchdog/Makefile ++++ b/drivers/watchdog/Makefile +@@ -1,3 +1,4 @@ + obj-$(CONFIG_WATCHDOG) += wd_core.o ++obj-$(CONFIG_WATCHDOG_AT91SAM9X) += at91sam9_wdt.o + obj-$(CONFIG_WATCHDOG_MXS28) += im28wd.o + obj-$(CONFIG_WATCHDOG_IMX_RESET_SOURCE) += imxwd.o +diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c +new file mode 100644 +index 0000000..203d83a +--- /dev/null ++++ b/drivers/watchdog/at91sam9_wdt.c +@@ -0,0 +1,131 @@ ++/* ++ * (c) 2012 Juergen Beisert <kernel@pengutronix.de> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License as published by ++ * the Free Software Foundation; either version 2 of the License, or ++ * (at your option) any later version. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ * Note: this driver works for the i.MX28 SoC. It might work for the ++ * i.MX23 Soc as well, but is not tested yet. ++ */ ++ ++#include <common.h> ++#include <init.h> ++#include <io.h> ++#include <errno.h> ++#include <malloc.h> ++#include <watchdog.h> ++ ++#include "at91sam9_wdt.h" ++ ++struct at91sam9_wdt { ++ struct watchdog wdt; ++ void __iomem *base; ++}; ++ ++#define to_at91sam9_wdt(h) container_of(h, struct at91sam9_wdt, wdt) ++ ++#define wdt_read(at91wdt, field) \ ++ __raw_readl(at91wdt->base + field) ++#define wdt_write(at91wdt, field, val) \ ++ __raw_writel((val), at91wdt->base + field) ++ ++static void at91sam9_wdt_keep_alive(struct watchdog *wdt) ++{ ++ struct at91sam9_wdt *at91wdt = to_at91sam9_wdt(wdt); ++ ++ wdt_write(at91wdt, AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT); ++} ++ ++static int at91sam9_wdt_settimeout(struct watchdog *wdt, unsigned int timeout) ++{ ++ struct at91sam9_wdt *at91wdt = to_at91sam9_wdt(wdt); ++ unsigned int reg; ++ unsigned int mr; ++ ++ /* Check if disabled */ ++ mr = wdt_read(at91wdt, AT91_WDT_MR); ++ if (mr & AT91_WDT_WDDIS) { ++ pr_err("sorry, watchdog is disabled\n"); ++ return -EIO; ++ } ++ ++ if (!timeout) { ++ wdt_write(at91wdt, AT91_WDT_MR, AT91_WDT_WDDIS); ++ return 0; ++ } ++ ++ /* ++ * All counting occurs at SLOW_CLOCK / 128 = 256 Hz ++ * ++ * Since WDV is a 12-bit counter, the maximum period is ++ * 4096 / 256 = 16 seconds. ++ */ ++ reg = AT91_WDT_WDRSTEN /* causes watchdog reset */ ++ /* | AT91_WDT_WDRPROC causes processor reset only */ ++ | AT91_WDT_WDDBGHLT /* disabled in debug mode */ ++ | AT91_WDT_WDD /* restart at any time */ ++ | (timeout & AT91_WDT_WDV); /* timer value */ ++ wdt_write(at91wdt, AT91_WDT_MR, reg); ++ ++ return 0; ++} ++ ++static int at91sam9_wdt_probe(struct device_d *dev) ++{ ++ struct at91sam9_wdt *priv; ++ struct watchdog *wdt; ++ int ret; ++ unsigned int mr; ++ ++ priv = xzalloc(sizeof(struct at91sam9_wdt)); ++ priv->base = dev_request_mem_region(dev, 0); ++ wdt = &priv->wdt; ++ ++ wdt->set_timeout = at91sam9_wdt_settimeout; ++ wdt->keep_alive = at91sam9_wdt_keep_alive; ++ ++ /* Check if disabled */ ++ mr = wdt_read(priv, AT91_WDT_MR); ++ if (mr & AT91_WDT_WDDIS) { ++ dev_err(dev, "sorry, watchdog is disabled\n"); ++ ret = -EIO; ++ goto err; ++ } ++ ++ ret = watchdog_register(wdt); ++ if (ret != 0) ++ goto err; ++ ++ dev->priv = priv; ++ return 0; ++ ++err: ++ free(priv); ++ return ret; ++} ++ ++static void at91sam9_wdt_remove(struct device_d *dev) ++{ ++ struct at91sam9_wdt *priv= dev->priv; ++ watchdog_deregister(&priv->wdt); ++ free(priv); ++} ++ ++static struct driver_d at91sam9_wdt_driver = { ++ .name = "at91sam9_wdt", ++ .probe = at91sam9_wdt_probe, ++ .remove = at91sam9_wdt_remove, ++}; ++ ++static int at91sam9_wdt_init(void) ++{ ++ return platform_driver_register(&at91sam9_wdt_driver); ++} ++coredevice_initcall(at91sam9_wdt_init); +diff --git a/drivers/watchdog/at91sam9_wdt.h b/drivers/watchdog/at91sam9_wdt.h +new file mode 100644 +index 0000000..2b68c1a +--- /dev/null ++++ b/drivers/watchdog/at91sam9_wdt.h +@@ -0,0 +1,38 @@ ++/* ++ * drivers/watchdog/at91sam9_wdt.h ++ * ++ * Copyright (C) 2007 Andrew Victor ++ * Copyright (C) 2007 Atmel Corporation. ++ * ++ * Watchdog Timer (WDT) - System peripherals regsters. ++ * Based on AT91SAM9261 datasheet revision D. ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License as published by ++ * the Free Software Foundation; either version 2 of the License, or ++ * (at your option) any later version. ++ */ ++ ++#ifndef AT91_WDT_H ++#define AT91_WDT_H ++ ++#define AT91_WDT_CR 0x00 /* Watchdog Control Register */ ++#define AT91_WDT_WDRSTT (1 << 0) /* Restart */ ++#define AT91_WDT_KEY (0xa5 << 24) /* KEY Password */ ++ ++#define AT91_WDT_MR 0x04 /* Watchdog Mode Register */ ++#define AT91_WDT_WDV (0xfff << 0) /* Counter Value */ ++#define AT91_WDT_WDFIEN (1 << 12) /* Fault Interrupt Enable */ ++#define AT91_WDT_WDRSTEN (1 << 13) /* Reset Processor */ ++#define AT91_WDT_WDRPROC (1 << 14) /* Timer Restart */ ++#define AT91_WDT_WDDIS (1 << 15) /* Watchdog Disable */ ++#define AT91_WDT_WDD (0xfff << 16) /* Delta Value */ ++#define AT91_WDT_WDDBGHLT (1 << 28) /* Debug Halt */ ++#define AT91_WDT_WDIDLEHLT (1 << 29) /* Idle Halt */ ++ ++#define AT91_WDT_SR 0x08 /* Watchdog Status Register */ ++#define AT91_WDT_WDUNF (1 << 0) /* Watchdog Underflow */ ++#define AT91_WDT_WDERR (1 << 1) /* Watchdog Error */ ++ ++ ++#endif +-- +1.8.1.4 + |