Commit 71839f7d authored by Ben Hutchings's avatar Ben Hutchings Committed by David S. Miller
Browse files

sfc: Distinguish critical and non-critical over-temperature conditions 



Set both the 'maximum' and critical temperature limits for LM87
hardware monitors on Falcon boards.  Do not shut down a port until the
critical temperature is reached, but warn as soon as the 'maximum'
temperature is reached.

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4484cd7d

drivers/net/sfc/falcon_boards.c

+80 −29
Original line number Diff line number Diff line
@@ -30,17 +30,28 @@ 
#define FALCON_BOARD_SFN4112F 0x52



/* Board temperature is about 15°C above ambient when air flow is

 * limited. */

 * limited.  The maximum acceptable ambient temperature varies

 * depending on the PHY specifications but the critical temperature

 * above which we should shut down to avoid damage is 80°C. */

#define FALCON_BOARD_TEMP_BIAS	15

#define FALCON_BOARD_TEMP_CRIT	(80 + FALCON_BOARD_TEMP_BIAS)



/* SFC4000 datasheet says: 'The maximum permitted junction temperature

 * is 125°C; the thermal design of the environment for the SFC4000

 * should aim to keep this well below 100°C.' */

#define FALCON_JUNC_TEMP_MIN	0

#define FALCON_JUNC_TEMP_MAX	90

#define FALCON_JUNC_TEMP_CRIT	125



/*****************************************************************************

 * Support for LM87 sensor chip used on several boards

 */

#define LM87_REG_TEMP_HW_INT_LOCK	0x13

#define LM87_REG_TEMP_HW_EXT_LOCK	0x14

#define LM87_REG_TEMP_HW_INT		0x17

#define LM87_REG_TEMP_HW_EXT		0x18

#define LM87_REG_TEMP_EXT1		0x26

#define LM87_REG_TEMP_INT		0x27

#define LM87_REG_ALARMS1		0x41

#define LM87_REG_ALARMS2		0x42

#define LM87_IN_LIMITS(nr, _min, _max)			\
@@ -57,6 +68,27 @@ 


#if defined(CONFIG_SENSORS_LM87) || defined(CONFIG_SENSORS_LM87_MODULE)



static int efx_poke_lm87(struct i2c_client *client, const u8 *reg_values)

{

	while (*reg_values) {

		u8 reg = *reg_values++;

		u8 value = *reg_values++;

		int rc = i2c_smbus_write_byte_data(client, reg, value);

		if (rc)

			return rc;

	}

	return 0;

}



static const u8 falcon_lm87_common_regs[] = {

	LM87_REG_TEMP_HW_INT_LOCK, FALCON_BOARD_TEMP_CRIT,

	LM87_REG_TEMP_HW_INT, FALCON_BOARD_TEMP_CRIT,

	LM87_TEMP_EXT1_LIMITS(FALCON_JUNC_TEMP_MIN, FALCON_JUNC_TEMP_MAX),

	LM87_REG_TEMP_HW_EXT_LOCK, FALCON_JUNC_TEMP_CRIT,

	LM87_REG_TEMP_HW_EXT, FALCON_JUNC_TEMP_CRIT,

	0

};



static int efx_init_lm87(struct efx_nic *efx, struct i2c_board_info *info,

			 const u8 *reg_values)

{
@@ -67,13 +99,12 @@ static int efx_init_lm87(struct efx_nic *efx, struct i2c_board_info *info, 
	if (!client)

		return -EIO;



	while (*reg_values) {

		u8 reg = *reg_values++;

		u8 value = *reg_values++;

		rc = i2c_smbus_write_byte_data(client, reg, value);

	rc = efx_poke_lm87(client, reg_values);

	if (rc)

		goto err;

	rc = efx_poke_lm87(client, falcon_lm87_common_regs);

	if (rc)

		goto err;

	}



	board->hwmon_client = client;

	return 0;
@@ -91,36 +122,56 @@ static void efx_fini_lm87(struct efx_nic *efx) 
static int efx_check_lm87(struct efx_nic *efx, unsigned mask)

{

	struct i2c_client *client = falcon_board(efx)->hwmon_client;

	s32 alarms1, alarms2;

	bool temp_crit, elec_fault, is_failure;

	u16 alarms;

	s32 reg;



	/* If link is up then do not monitor temperature */

	if (EFX_WORKAROUND_7884(efx) && efx->link_state.up)

		return 0;



	alarms1 = i2c_smbus_read_byte_data(client, LM87_REG_ALARMS1);

	alarms2 = i2c_smbus_read_byte_data(client, LM87_REG_ALARMS2);

	if (alarms1 < 0)

		return alarms1;

	if (alarms2 < 0)

		return alarms2;

	alarms1 &= mask;

	alarms2 &= mask >> 8;

	if (alarms1 || alarms2) {

	reg = i2c_smbus_read_byte_data(client, LM87_REG_ALARMS1);

	if (reg < 0)

		return reg;

	alarms = reg;

	reg = i2c_smbus_read_byte_data(client, LM87_REG_ALARMS2);

	if (reg < 0)

		return reg;

	alarms |= reg << 8;

	alarms &= mask;



	temp_crit = false;

	if (alarms & LM87_ALARM_TEMP_INT) {

		reg = i2c_smbus_read_byte_data(client, LM87_REG_TEMP_INT);

		if (reg < 0)

			return reg;

		if (reg > FALCON_BOARD_TEMP_CRIT)

			temp_crit = true;

	}

	if (alarms & LM87_ALARM_TEMP_EXT1) {

		reg = i2c_smbus_read_byte_data(client, LM87_REG_TEMP_EXT1);

		if (reg < 0)

			return reg;

		if (reg > FALCON_JUNC_TEMP_CRIT)

			temp_crit = true;

	}

	elec_fault = alarms & ~(LM87_ALARM_TEMP_INT | LM87_ALARM_TEMP_EXT1);

	is_failure = temp_crit || elec_fault;



	if (alarms)

		netif_err(efx, hw, efx->net_dev,

			  "LM87 detected a hardware failure (status %02x:%02x)"

			  "%s%s%s\n",

			  alarms1, alarms2,

			  (alarms1 & LM87_ALARM_TEMP_INT) ?

			  "LM87 detected a hardware %s (status %02x:%02x)"

			  "%s%s%s%s\n",

			  is_failure ? "failure" : "problem",

			  alarms & 0xff, alarms >> 8,

			  (alarms & LM87_ALARM_TEMP_INT) ?

			  "; board is overheating" : "",

			  (alarms1 & LM87_ALARM_TEMP_EXT1) ?

			  (alarms & LM87_ALARM_TEMP_EXT1) ?

			  "; controller is overheating" : "",

			  (alarms1 & ~(LM87_ALARM_TEMP_INT | LM87_ALARM_TEMP_EXT1)

			   || alarms2) ?

			  "; electrical fault" : "");

		return -ERANGE;

	}

			  temp_crit ? "; reached critical temperature" : "",

			  elec_fault ? "; electrical fault" : "");



	return 0;

	return is_failure ? -ERANGE : 0;

}



#else /* !CONFIG_SENSORS_LM87 */

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