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platform: sifive_fu740: fix reset when watchdog is running

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When the watchdog is running the HiFive Unmatched board does not reboot
properly and shuts down itself a few seconds after reboot, in the early
stages of the u-boot loading. On a Linux kernel this happens when the
da9063_wdt module is loaded. This does not happen if the module is
unloaded before reboot or if the watchdog module is loaded with
"stop_on_reboot=1".

Fix that by stopping the watchdog before attempting to reset the board.
This is done by zeroing the TWDSCALE field of CONTROL_D register, unless
it was already set to 0.

Reported-by: Tianon Gravi <tianon@debian.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Nikita Shubin <n.shubin@yadro.com>
Tested-by: Nikita Shubin <n.shubin@yadro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Aurelien Jarno
2022-01-05 08:20:39 +01:00
committed by Anup Patel
parent 8257262dbf
commit fb688d9e9d
1 changed files with 25 additions and 0 deletions
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25
platform/generic/sifive_fu740.c
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@@ -22,6 +22,7 @@
#define DA9063_REG_PAGE_CON 0x00
#define DA9063_REG_CONTROL_A 0x0e
#define DA9063_REG_CONTROL_D 0x11
#define DA9063_REG_CONTROL_F 0x13
#define DA9063_REG_DEVICE_ID 0x81
@@ -29,6 +30,8 @@
#define DA9063_CONTROL_A_M_POWER_EN (1 << 5)
#define DA9063_CONTROL_A_STANDBY (1 << 3)
#define DA9063_CONTROL_D_TWDSCALE_MASK 0x07
#define DA9063_CONTROL_F_WAKEUP (1 << 2)
#define DA9063_CONTROL_F_SHUTDOWN (1 << 1)
@@ -79,6 +82,27 @@ static inline int da9063_sanity_check(struct i2c_adapter *adap, uint32_t reg)
return 0;
}
static inline int da9063_stop_watchdog(struct i2c_adapter *adap, uint32_t reg)
{
uint8_t val;
int rc = i2c_adapter_reg_write(adap, reg,
DA9063_REG_PAGE_CON, 0x00);
if (rc)
return rc;
rc = i2c_adapter_reg_read(adap, reg, DA9063_REG_CONTROL_D, &val);
if (rc)
return rc;
if ((val & DA9063_CONTROL_D_TWDSCALE_MASK) == 0)
return 0;
val &= ~DA9063_CONTROL_D_TWDSCALE_MASK;
return i2c_adapter_reg_write(adap, reg, DA9063_REG_CONTROL_D, val);
}
static inline int da9063_shutdown(struct i2c_adapter *adap, uint32_t reg)
{
int rc = i2c_adapter_reg_write(adap, reg,
@@ -133,6 +157,7 @@ static void da9063_system_reset(u32 type, u32 reason)
break;
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
da9063_stop_watchdog(adap, reg);
da9063_reset(adap, reg);
break;
}