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watchdog: Introduce watchdog driver for Intel Tangier

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Add watchdog driver for Intel Tangier based platforms.

Signed-off-by: Vincent Tinelli <vincent.tinelli@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Felipe Balbi 2017-07-05 20:33:20 +03:00 • committed by Bin Meng
parent 611dbb7f95
commit 8f8a12d1e7
3 changed files with 82 additions and 1 deletions
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11
drivers/watchdog/Kconfig
View file

@ -19,7 +19,16 @@ config OMAP_WATCHDOG
default y if AM33XX
help
Say Y here to enable the OMAP3+ watchdog driver.
config TANGIER_WATCHDOG
bool "Intel Tangier watchdog"
depends on INTEL_MID
select HW_WATCHDOG
help
This enables support for watchdog controller available on
Intel Tangier SoC. If you're using a board with Intel Tangier
SoC, say Y here.
config ULP_WATCHDOG
bool "i.MX7ULP watchdog"
help

1
drivers/watchdog/Makefile
View file

@ -14,6 +14,7 @@ obj-$(CONFIG_S5P) += s5p_wdt.o
obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o
obj-$(CONFIG_TANGIER_WATCHDOG) += tangier_wdt.o
obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o
obj-$(CONFIG_WDT) += wdt-uclass.o
obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o

71
drivers/watchdog/tangier_wdt.c Normal file
View file

@ -0,0 +1,71 @@
/*
* Copyright (c) 2017 Intel Corporation
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <watchdog.h>
#include <asm/scu.h>
/* Hardware timeout in seconds */
#define WDT_PRETIMEOUT 15
#define WDT_TIMEOUT_MIN (1 + WDT_PRETIMEOUT)
#define WDT_TIMEOUT_MAX 170
#define WDT_DEFAULT_TIMEOUT 90
#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
#define WATCHDOG_HEARTBEAT 60000
#else
#define WATCHDOG_HEARTBEAT CONFIG_WATCHDOG_TIMEOUT_MSECS
#endif
enum {
SCU_WATCHDOG_START = 0,
SCU_WATCHDOG_STOP = 1,
SCU_WATCHDOG_KEEPALIVE = 2,
SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT = 3,
};
void hw_watchdog_reset(void)
{
static unsigned long last;
unsigned long now;
if (gd->timer)
now = timer_get_us();
else
now = rdtsc() / 1000;
/* Do not flood SCU */
if (last > now)
last = 0;
if (unlikely((now - last) > (WDT_PRETIMEOUT / 2) * 1000000)) {
last = now;
scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
}
}
int hw_watchdog_disable(void)
{
return scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_STOP);
}
void hw_watchdog_init(void)
{
u32 timeout = WATCHDOG_HEARTBEAT / 1000;
int in_size;
struct ipc_wd_start {
u32 pretimeout;
u32 timeout;
} ipc_wd_start = { timeout - WDT_PRETIMEOUT, timeout };
/*
* SCU expects the input size for watchdog IPC
* to be based on 4 bytes
*/
in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
scu_ipc_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_START,
(u32 *)&ipc_wd_start, in_size, NULL, 0);
}