summaryrefslogtreecommitdiffstats
path: root/drivers/watchdog
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2010-10-21 21:19:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-21 21:19:54 -0700
commitd4429f608abde89e8bc1e24b43cd503feb95c496 (patch)
tree4c11afa193593a5e3949391bf35022b4f87ba375 /drivers/watchdog
parente10117d36ef758da0690c95ecffc09d5dd7da479 (diff)
parent6a1c9dfe4186f18fed38421b35b40fb9260cbfe1 (diff)
downloadlinux-d4429f608abde89e8bc1e24b43cd503feb95c496.tar.bz2
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (71 commits) powerpc/44x: Update ppc44x_defconfig powerpc/watchdog: Make default timeout for Book-E watchdog a Kconfig option fsl_rio: Add comments for sRIO registers. powerpc/fsl-booke: Add e55xx (64-bit) smp defconfig powerpc/fsl-booke: Add p5020 DS board support powerpc/fsl-booke64: Use TLB CAMs to cover linear mapping on FSL 64-bit chips powerpc/fsl-booke: Add support for FSL Arch v1.0 MMU in setup_page_sizes powerpc/fsl-booke: Add support for FSL 64-bit e5500 core powerpc/85xx: add cache-sram support powerpc/85xx: add ngPIXIS FPGA device tree node to the P1022DS board powerpc: Fix compile error with paca code on ppc64e powerpc/fsl-booke: Add p3041 DS board support oprofile/fsl emb: Don't set MSR[PMM] until after clearing the interrupt. powerpc/fsl-booke: Add PCI device ids for P2040/P3041/P5010/P5020 QoirQ chips powerpc/mpc8xxx_gpio: Add support for 'qoriq-gpio' controllers powerpc/fsl_booke: Add support to boot from core other than 0 powerpc/p1022: Add probing for individual DMA channels powerpc/fsl_soc: Search all global-utilities nodes for rstccr powerpc: Fix invalid page flags in create TLB CAM path for PTE_64BIT powerpc/mpc83xx: Support for MPC8308 P1M board ... Fix up conflict with the generic irq_work changes in arch/powerpc/kernel/time.c
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/Kconfig22
-rw-r--r--drivers/watchdog/booke_wdt.c47
2 files changed, 59 insertions, 10 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 24efd8ea41bb..c356146bd712 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -957,12 +957,32 @@ config PIKA_WDT
the Warp platform.
config BOOKE_WDT
- bool "PowerPC Book-E Watchdog Timer"
+ tristate "PowerPC Book-E Watchdog Timer"
depends on BOOKE || 4xx
---help---
+ Watchdog driver for PowerPC Book-E chips, such as the Freescale
+ MPC85xx SOCs and the IBM PowerPC 440.
+
Please see Documentation/watchdog/watchdog-api.txt for
more information.
+config BOOKE_WDT_DEFAULT_TIMEOUT
+ int "PowerPC Book-E Watchdog Timer Default Timeout"
+ depends on BOOKE_WDT
+ default 38 if FSL_BOOKE
+ range 0 63 if FSL_BOOKE
+ default 3 if !FSL_BOOKE
+ range 0 3 if !FSL_BOOKE
+ help
+ Select the default watchdog timer period to be used by the PowerPC
+ Book-E watchdog driver. A watchdog "event" occurs when the bit
+ position represented by this number transitions from zero to one.
+
+ For Freescale Book-E processors, this is a number between 0 and 63.
+ For other Book-E processors, this is a number between 0 and 3.
+
+ The value can be overidden by the wdt_period command-line parameter.
+
# PPC64 Architecture
config WATCHDOG_RTAS
diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c
index 3d49671cdf5a..d11ffb091b0d 100644
--- a/drivers/watchdog/booke_wdt.c
+++ b/drivers/watchdog/booke_wdt.c
@@ -4,7 +4,7 @@
* Author: Matthew McClintock
* Maintainer: Kumar Gala <galak@kernel.crashing.org>
*
- * Copyright 2005, 2008 Freescale Semiconductor Inc.
+ * Copyright 2005, 2008, 2010 Freescale Semiconductor Inc.
*
* 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
@@ -33,14 +33,8 @@
* occur, and the final time the board will reset.
*/
-#ifdef CONFIG_FSL_BOOKE
-#define WDT_PERIOD_DEFAULT 38 /* Ex. wdt_period=28 bus=333Mhz,reset=~40sec */
-#else
-#define WDT_PERIOD_DEFAULT 3 /* Refer to the PPC40x and PPC4xx manuals */
-#endif /* for timing information */
-
u32 booke_wdt_enabled;
-u32 booke_wdt_period = WDT_PERIOD_DEFAULT;
+u32 booke_wdt_period = CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT;
#ifdef CONFIG_FSL_BOOKE
#define WDTP(x) ((((x)&0x3)<<30)|(((x)&0x3c)<<15))
@@ -114,6 +108,27 @@ static void __booke_wdt_enable(void *data)
mtspr(SPRN_TCR, val);
}
+/**
+ * booke_wdt_disable - disable the watchdog on the given CPU
+ *
+ * This function is called on each CPU. It disables the watchdog on that CPU.
+ *
+ * TCR[WRC] cannot be changed once it has been set to non-zero, but we can
+ * effectively disable the watchdog by setting its period to the maximum value.
+ */
+static void __booke_wdt_disable(void *data)
+{
+ u32 val;
+
+ val = mfspr(SPRN_TCR);
+ val &= ~(TCR_WIE | WDTP_MASK);
+ mtspr(SPRN_TCR, val);
+
+ /* clear status to make sure nothing is pending */
+ __booke_wdt_ping(NULL);
+
+}
+
static ssize_t booke_wdt_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
@@ -193,12 +208,21 @@ static int booke_wdt_open(struct inode *inode, struct file *file)
return nonseekable_open(inode, file);
}
+static int booke_wdt_release(struct inode *inode, struct file *file)
+{
+ on_each_cpu(__booke_wdt_disable, NULL, 0);
+ booke_wdt_enabled = 0;
+
+ return 0;
+}
+
static const struct file_operations booke_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = booke_wdt_write,
.unlocked_ioctl = booke_wdt_ioctl,
.open = booke_wdt_open,
+ .release = booke_wdt_release,
};
static struct miscdevice booke_wdt_miscdev = {
@@ -237,4 +261,9 @@ static int __init booke_wdt_init(void)
return ret;
}
-device_initcall(booke_wdt_init);
+
+module_init(booke_wdt_init);
+module_exit(booke_wdt_exit);
+
+MODULE_DESCRIPTION("PowerPC Book-E watchdog driver");
+MODULE_LICENSE("GPL");