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linux/drivers/net/sfc/sfe4001.c
Ben Hutchings 190dbcfd68 sfc: SFT9001/SFN4111T: Check PHY boot status during board initialisation 
During SFN4111T initialisation, check whether the PHY boot status
indicates a bad firmware checksum.  If so, prepare to reflash rather
than continuing with normal initialisation.

Remove redundant PHY boot status check from tenxpress_phy_init().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-02 03:15:03 -08:00

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/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2007-2008 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
/*****************************************************************************
* Support for the SFE4001 and SFN4111T NICs.
*
* The SFE4001 does not power-up fully at reset due to its high power
* consumption. We control its power via a PCA9539 I/O expander.
* Both boards have a MAX6647 temperature monitor which we expose to
* the lm90 driver.
*
* This also provides minimal support for reflashing the PHY, which is
* initiated by resetting it with the FLASH_CFG_1 pin pulled down.
* On SFE4001 rev A2 and later this is connected to the 3V3X output of
* the IO-expander; on the SFN4111T it is connected to Falcon's GPIO3.
* We represent reflash mode as PHY_MODE_SPECIAL and make it mutually
* exclusive with the network device being open.
*/
#include <linux/delay.h>
#include <linux/rtnetlink.h>
#include "net_driver.h"
#include "efx.h"
#include "phy.h"
#include "boards.h"
#include "falcon.h"
#include "falcon_hwdefs.h"
#include "falcon_io.h"
#include "mac.h"
#include "workarounds.h"
/**************************************************************************
*
* I2C IO Expander device
*
**************************************************************************/
#define PCA9539 0x74
#define P0_IN 0x00
#define P0_OUT 0x02
#define P0_INVERT 0x04
#define P0_CONFIG 0x06
#define P0_EN_1V0X_LBN 0
#define P0_EN_1V0X_WIDTH 1
#define P0_EN_1V2_LBN 1
#define P0_EN_1V2_WIDTH 1
#define P0_EN_2V5_LBN 2
#define P0_EN_2V5_WIDTH 1
#define P0_EN_3V3X_LBN 3
#define P0_EN_3V3X_WIDTH 1
#define P0_EN_5V_LBN 4
#define P0_EN_5V_WIDTH 1
#define P0_SHORTEN_JTAG_LBN 5
#define P0_SHORTEN_JTAG_WIDTH 1
#define P0_X_TRST_LBN 6
#define P0_X_TRST_WIDTH 1
#define P0_DSP_RESET_LBN 7
#define P0_DSP_RESET_WIDTH 1
#define P1_IN 0x01
#define P1_OUT 0x03
#define P1_INVERT 0x05
#define P1_CONFIG 0x07
#define P1_AFE_PWD_LBN 0
#define P1_AFE_PWD_WIDTH 1
#define P1_DSP_PWD25_LBN 1
#define P1_DSP_PWD25_WIDTH 1
#define P1_RESERVED_LBN 2
#define P1_RESERVED_WIDTH 2
#define P1_SPARE_LBN 4
#define P1_SPARE_WIDTH 4
/* Temperature Sensor */
#define MAX664X_REG_RSL 0x02
#define MAX664X_REG_WLHO 0x0B
static void sfe4001_poweroff(struct efx_nic *efx)
{
struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
/* Turn off all power rails and disable outputs */
i2c_smbus_write_byte_data(ioexp_client, P0_OUT, 0xff);
i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG, 0xff);
i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0xff);
/* Clear any over-temperature alert */
i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
}
static int sfe4001_poweron(struct efx_nic *efx)
{
struct i2c_client *hwmon_client = efx->board_info.hwmon_client;
struct i2c_client *ioexp_client = efx->board_info.ioexp_client;
unsigned int i, j;
int rc;
u8 out;
/* Clear any previous over-temperature alert */
rc = i2c_smbus_read_byte_data(hwmon_client, MAX664X_REG_RSL);
if (rc < 0)
return rc;
/* Enable port 0 and port 1 outputs on IO expander */
rc = i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0x00);
if (rc)
return rc;
rc = i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG,
0xff & ~(1 << P1_SPARE_LBN));
if (rc)
goto fail_on;
/* If PHY power is on, turn it all off and wait 1 second to
* ensure a full reset.
*/
rc = i2c_smbus_read_byte_data(ioexp_client, P0_OUT);
if (rc < 0)
goto fail_on;
out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
(0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
(0 << P0_EN_1V0X_LBN));
if (rc != out) {
EFX_INFO(efx, "power-cycling PHY\n");
rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
if (rc)
goto fail_on;
schedule_timeout_uninterruptible(HZ);
}
for (i = 0; i < 20; ++i) {
/* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
out = 0xff & ~((1 << P0_EN_1V2_LBN) | (1 << P0_EN_2V5_LBN) |
(1 << P0_EN_3V3X_LBN) | (1 << P0_EN_5V_LBN) |
(1 << P0_X_TRST_LBN));
if (efx->phy_mode & PHY_MODE_SPECIAL)
out |= 1 << P0_EN_3V3X_LBN;
rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
if (rc)
goto fail_on;
msleep(10);
/* Turn on 1V power rail */
out &= ~(1 << P0_EN_1V0X_LBN);
rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
if (rc)
goto fail_on;
EFX_INFO(efx, "waiting for DSP boot (attempt %d)...\n", i);
/* In flash config mode, DSP does not turn on AFE, so
* just wait 1 second.
*/
if (efx->phy_mode & PHY_MODE_SPECIAL) {
schedule_timeout_uninterruptible(HZ);
return 0;
}
for (j = 0; j < 10; ++j) {
msleep(100);
/* Check DSP has asserted AFE power line */
rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
if (rc < 0)
goto fail_on;
if (rc & (1 << P1_AFE_PWD_LBN))
return 0;
}
}
EFX_INFO(efx, "timed out waiting for DSP boot\n");
rc = -ETIMEDOUT;
fail_on:
sfe4001_poweroff(efx);
return rc;
}
static int sfn4111t_reset(struct efx_nic *efx)
{
efx_oword_t reg;
/* GPIO 3 and the GPIO register are shared with I2C, so block that */
mutex_lock(&efx->i2c_adap.bus_lock);
/* Pull RST_N (GPIO 2) low then let it up again, setting the
* FLASH_CFG_1 strap (GPIO 3) appropriately. Only change the
* output enables; the output levels should always be 0 (low)
* and we rely on external pull-ups. */
falcon_read(efx, &reg, GPIO_CTL_REG_KER);
EFX_SET_OWORD_FIELD(reg, GPIO2_OEN, true);
falcon_write(efx, &reg, GPIO_CTL_REG_KER);
msleep(1000);
EFX_SET_OWORD_FIELD(reg, GPIO2_OEN, false);
EFX_SET_OWORD_FIELD(reg, GPIO3_OEN,
!!(efx->phy_mode & PHY_MODE_SPECIAL));
falcon_write(efx, &reg, GPIO_CTL_REG_KER);
msleep(1);
mutex_unlock(&efx->i2c_adap.bus_lock);
ssleep(1);
return 0;
}
static ssize_t show_phy_flash_cfg(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
return sprintf(buf, "%d\n", !!(efx->phy_mode & PHY_MODE_SPECIAL));
}
static ssize_t set_phy_flash_cfg(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
enum efx_phy_mode old_mode, new_mode;
int err;
rtnl_lock();
old_mode = efx->phy_mode;
if (count == 0 || *buf == '0')
new_mode = old_mode & ~PHY_MODE_SPECIAL;
else
new_mode = PHY_MODE_SPECIAL;
if (old_mode == new_mode) {
err = 0;
} else if (efx->state != STATE_RUNNING || netif_running(efx->net_dev)) {
err = -EBUSY;
} else {
/* Reset the PHY, reconfigure the MAC and enable/disable
* MAC stats accordingly. */
efx->phy_mode = new_mode;
if (new_mode & PHY_MODE_SPECIAL)
efx_stats_disable(efx);
if (efx->board_info.type == EFX_BOARD_SFE4001)
err = sfe4001_poweron(efx);
else
err = sfn4111t_reset(efx);
efx_reconfigure_port(efx);
if (!(new_mode & PHY_MODE_SPECIAL))
efx_stats_enable(efx);
}
rtnl_unlock();
return err ? err : count;
}
static DEVICE_ATTR(phy_flash_cfg, 0644, show_phy_flash_cfg, set_phy_flash_cfg);
static void sfe4001_fini(struct efx_nic *efx)
{
EFX_INFO(efx, "%s\n", __func__);
device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
sfe4001_poweroff(efx);
i2c_unregister_device(efx->board_info.ioexp_client);
i2c_unregister_device(efx->board_info.hwmon_client);
}
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) && efx->mac_up)
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;
}
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)
{
int rc;
#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;
/* 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_hwmon;
efx->board_info.ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
if (!efx->board_info.ioexp_client) {
rc = -EIO;
goto fail_hwmon;
}
/* 10Xpress has fixed-function LED pins, so there is no board-specific
* blink code. */
efx->board_info.blink = tenxpress_phy_blink;
efx->board_info.monitor = sfe4001_check_hw;
efx->board_info.fini = sfe4001_fini;
if (efx->phy_mode & PHY_MODE_SPECIAL) {
/* PHY won't generate a 156.25 MHz clock and MAC stats fetch
* will fail. */
efx_stats_disable(efx);
}
rc = sfe4001_poweron(efx);
if (rc)
goto fail_ioexp;
rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
if (rc)
goto fail_on;
EFX_INFO(efx, "PHY is powered on\n");
return 0;
fail_on:
sfe4001_poweroff(efx);
fail_ioexp:
i2c_unregister_device(efx->board_info.ioexp_client);
fail_hwmon:
i2c_unregister_device(efx->board_info.hwmon_client);
return rc;
}
static int sfn4111t_check_hw(struct efx_nic *efx)
{
s32 status;
/* If XAUI link is up then do not monitor */
if (EFX_WORKAROUND_7884(efx) && efx->mac_up)
return 0;
/* Test LHIGH, RHIGH, FAULT, EOT and IOT alarms */
status = i2c_smbus_read_byte_data(efx->board_info.hwmon_client,
MAX664X_REG_RSL);
if (status < 0)
return -EIO;
if (status & 0x57)
return -ERANGE;
return 0;
}
static void sfn4111t_fini(struct efx_nic *efx)
{
EFX_INFO(efx, "%s\n", __func__);
device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
i2c_unregister_device(efx->board_info.hwmon_client);
}
static struct i2c_board_info sfn4111t_a0_hwmon_info = {
I2C_BOARD_INFO("max6647", 0x4e),
.irq = -1,
};
static struct i2c_board_info sfn4111t_r5_hwmon_info = {
I2C_BOARD_INFO("max6646", 0x4d),
.irq = -1,
};
int sfn4111t_init(struct efx_nic *efx)
{
int i = 0;
int rc;
efx->board_info.hwmon_client =
i2c_new_device(&efx->i2c_adap,
(efx->board_info.minor < 5) ?
&sfn4111t_a0_hwmon_info :
&sfn4111t_r5_hwmon_info);
if (!efx->board_info.hwmon_client)
return -EIO;
efx->board_info.blink = tenxpress_phy_blink;
efx->board_info.monitor = sfn4111t_check_hw;
efx->board_info.fini = sfn4111t_fini;
rc = device_create_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
if (rc)
goto fail_hwmon;
do {
if (efx->phy_mode & PHY_MODE_SPECIAL) {
/* PHY may not generate a 156.25 MHz clock and MAC
* stats fetch will fail. */
efx_stats_disable(efx);
sfn4111t_reset(efx);
}
rc = sft9001_wait_boot(efx);
if (rc == 0)
return 0;
efx->phy_mode = PHY_MODE_SPECIAL;
} while (rc == -EINVAL && ++i < 2);
device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_flash_cfg);
fail_hwmon:
i2c_unregister_device(efx->board_info.hwmon_client);
return rc;
}
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