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sfc: Use lm87 and lm90 drivers for board temperature/power monitoring

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Add board monitoring to periodic work whenever link is down.
For SFE4001, report when a fault has caused the PHY to turn off.
For SFE4002, switch XFP PHY into low-power state in case of a fault.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Ben Hutchings
2008-11-04 20:34:56 +00:00
committed by Jeff Garzik
parent f41507245e
commit 3e133c44d2
8 changed files with 265 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

116
drivers/net/sfc/sfe4001.c
View File

@@ -21,6 +21,7 @@
#include "falcon_hwdefs.h"
#include "falcon_io.h"
#include "mac.h"
#include "workarounds.h"
/**************************************************************************
*
@@ -65,48 +66,9 @@
#define P1_SPARE_LBN 4
#define P1_SPARE_WIDTH 4
/**************************************************************************
*
* Temperature Sensor
*
**************************************************************************/
#define MAX6647 0x4e
#define RLTS 0x00
#define RLTE 0x01
#define RSL 0x02
#define RCL 0x03
#define RCRA 0x04
#define RLHN 0x05
#define RLLI 0x06
#define RRHI 0x07
#define RRLS 0x08
#define WCRW 0x0a
#define WLHO 0x0b
#define WRHA 0x0c
#define WRLN 0x0e
#define OSHT 0x0f
#define REET 0x10
#define RIET 0x11
#define RWOE 0x19
#define RWOI 0x20
#define HYS 0x21
#define QUEUE 0x22
#define MFID 0xfe
#define REVID 0xff
/* Status bits */
#define MAX6647_BUSY (1 << 7) /* ADC is converting */
#define MAX6647_LHIGH (1 << 6) /* Local high temp. alarm */
#define MAX6647_LLOW (1 << 5) /* Local low temp. alarm */
#define MAX6647_RHIGH (1 << 4) /* Remote high temp. alarm */
#define MAX6647_RLOW (1 << 3) /* Remote low temp. alarm */
#define MAX6647_FAULT (1 << 2) /* DXN/DXP short/open circuit */
#define MAX6647_EOT (1 << 1) /* Remote junction overtemp. */
#define MAX6647_IOT (1 << 0) /* Local junction overtemp. */
static const u8 xgphy_max_temperature = 90;
/* Temperature Sensor */
#define MAX664X_REG_RSL 0x02
#define MAX664X_REG_WLHO 0x0B
static void sfe4001_poweroff(struct efx_nic *efx)
{
@@ -119,7 +81,7 @@ static void sfe4001_poweroff(struct efx_nic *efx)
i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0xff);
/* Clear any over-temperature alert */
i2c_smbus_read_byte_data(hwmon_client, RSL);
i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
}
static int sfe4001_poweron(struct efx_nic *efx)
@@ -131,7 +93,7 @@ static int sfe4001_poweron(struct efx_nic *efx)
u8 out;
/* Clear any previous over-temperature alert */
rc = i2c_smbus_read_byte_data(hwmon_client, RSL);
rc = i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
if (rc < 0)
return rc;
@@ -209,6 +171,34 @@ fail_on:
return rc;
}
static int sfe4001_check_hw(struct efx_nic *efx)
{
s32 status;
/* If XAUI link is up then do not monitor */
if (EFX_WORKAROUND_7884(efx) && falcon_xaui_link_ok(efx))
return 0;
/* Check the powered status of the PHY. Lack of power implies that
* the MAX6647 has shut down power to it, probably due to a temp.
* alarm. Reading the power status rather than the MAX6647 status
* directly because the later is read-to-clear and would thus
* start to power up the PHY again when polled, causing us to blip
* the power undesirably.
* We know we can read from the IO expander because we did
* it during power-on. Assume failure now is bad news. */
status = i2c_smbus_read_byte_data(efx->board_info.ioexp_client, P1_IN);
if (status >= 0 &&
(status & ((1 << P1_AFE_PWD_LBN) | (1 << P1_DSP_PWD25_LBN))) != 0)
return 0;
/* Use board power control, not PHY power control */
sfe4001_poweroff(efx);
efx->phy_mode = PHY_MODE_OFF;
return (status < 0) ? -EIO : -ERANGE;
}
/* On SFE4001 rev A2 and later, we can control the FLASH_CFG_1 pin
* using the 3V3X output of the IO-expander. Allow the user to set
* this when the device is stopped, and keep it stopped then.
@@ -261,35 +251,34 @@ static void sfe4001_fini(struct efx_nic *efx)
i2c_unregister_device(efx->board_info.hwmon_client);
}
static struct i2c_board_info sfe4001_hwmon_info = {
I2C_BOARD_INFO("max6647", 0x4e),
.irq = -1,
};
/* This board uses an I2C expander to provider power to the PHY, which needs to
* be turned on before the PHY can be used.
* Context: Process context, rtnl lock held
*/
int sfe4001_init(struct efx_nic *efx)
{
struct i2c_client *hwmon_client;
int rc;
hwmon_client = i2c_new_dummy(&efx->i2c_adap, MAX6647);
if (!hwmon_client)
#if defined(CONFIG_SENSORS_LM90) || defined(CONFIG_SENSORS_LM90_MODULE)
efx->board_info.hwmon_client =
i2c_new_device(&efx->i2c_adap, &sfe4001_hwmon_info);
#else
efx->board_info.hwmon_client =
i2c_new_dummy(&efx->i2c_adap, sfe4001_hwmon_info.addr);
#endif
if (!efx->board_info.hwmon_client)
return -EIO;
efx->board_info.hwmon_client = hwmon_client;
/* Set DSP over-temperature alert threshold */
EFX_INFO(efx, "DSP cut-out at %dC\n", xgphy_max_temperature);
rc = i2c_smbus_write_byte_data(hwmon_client, WLHO,
xgphy_max_temperature);
/* Raise board/PHY high limit from 85 to 90 degrees Celsius */
rc = i2c_smbus_write_byte_data(efx->board_info.hwmon_client,
MAX664X_REG_WLHO, 90);
if (rc)
goto fail_ioexp;
/* Read it back and verify */
rc = i2c_smbus_read_byte_data(hwmon_client, RLHN);
if (rc < 0)
goto fail_ioexp;
if (rc != xgphy_max_temperature) {
rc = -EFAULT;
goto fail_ioexp;
}
goto fail_hwmon;
efx->board_info.ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
if (!efx->board_info.ioexp_client) {
@@ -301,6 +290,7 @@ int sfe4001_init(struct efx_nic *efx)
* blink code. */
efx->board_info.blink = tenxpress_phy_blink;
efx->board_info.monitor = sfe4001_check_hw;
efx->board_info.fini = sfe4001_fini;
rc = sfe4001_poweron(efx);
@@ -319,6 +309,6 @@ fail_on:
fail_ioexp:
i2c_unregister_device(efx->board_info.ioexp_client);
fail_hwmon:
i2c_unregister_device(hwmon_client);
i2c_unregister_device(efx->board_info.hwmon_client);
return rc;
}