Hello Florian,
Am 04.12.2011 18:40, schrieb Florian Fainelli:
Hello Mathias,
Le dimanche 04 décembre 2011 18:16:39, Mathias Adam a écrit :
However, the device has a hardware watchdog which needs GPIO7 to be
toggled regularly. Otherwise, the device simply resets after 2-3 secs,
so I wasn't even able to boot into OpenWrt at first.
As a quick fix I put together a small kernel patch which adds a timer to
regularly perform the GPIO toggle. While this does work for me, I think
it could need some cleanup... perhaps, is there already an
infrastructure related to platform-/board-specific watchdogs where this
could be attached to?
Are there other devices already supported by OpenWrt with a similar
watchdog?
The MTX-1 board (AMD Alchemy) is using a similar GPIO-based watchdog:
http://lxr.linux.no/#linux+v3.1.4/drivers/watchdog/mtx-1_wdt.c
such a driver could be made generic by the way.
merci! indeed, from a quick glance it seems very similar to my patch.
I'll look into making a generic driver as you suggest.
For the moment I attach the patch which works for me:
---
trunk/build_dir/linux-brcm47xx/linux-3.0.9/drivers/mtd/maps/bcm47xx-pflash.c
2011-11-28 13:40:19.000000000 +0100
+++
trunk_copy111203/build_dir/linux-brcm47xx/linux-3.0.9/drivers/mtd/maps/bcm47xx-pflash.c
2011-12-03 23:01:37.000000000 +0100
@@ -48,13 +48,39 @@
#include <linux/io.h>
#include <asm/mach-bcm47xx/bcm47xx.h>
#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
#define WINDOW_ADDR 0x1fc00000
#define WINDOW_SIZE 0x400000
#define BUSWIDTH 2
static struct mtd_info *bcm47xx_mtd;
+static struct timer_list hwwdt_timer;
+
+static void bcm47xx_hwwdt_timer_tick(unsigned long unused)
+{
+ int ret;
+// printk(KERN_INFO "bcm47xx_timer_tick() called\n");
+
+ ret = gpio_request(7, "test");
+// printk(KERN_INFO "gpio_request(7) ret = %i\n", ret);
+
+ ret = gpio_direction_input(7);
+// printk(KERN_INFO "gpio_direction_input(7) ret = %i\n", ret);
+ ret = gpio_get_value(7);
+// printk(KERN_INFO "gpio_get_value(7) ret = %i\n", ret);
+
+ ret = gpio_direction_output(7, ret ? 0 : 1);
+// printk(KERN_INFO "gpio_direction_output(7, !ret) ret = %i\n",
ret);
+
+ gpio_free(7);
+
+ mod_timer(&hwwdt_timer, jiffies + HZ/5);
+}
+
static void bcm47xx_map_copy_from(struct map_info *map, void *to,
unsigned long from, ssize_t len)
{
if (len == 1) {
@@ -91,6 +117,10 @@
struct mtd_partition *partitions = NULL;
int num_partitions = 0;
+ pr_notice("starting hardware watchdog reset timer (for Huawei
E970 devices)\n");
+ setup_timer(&hwwdt_timer, bcm47xx_hwwdt_timer_tick, 0L);
+ bcm47xx_hwwdt_timer_tick(0);
+
switch (bcm47xx_bus_type) {
#ifdef CONFIG_BCM47XX_SSB
case BCM47XX_BUS_TYPE_SSB:
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