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kernel-ark/drivers/net/sfc/sfe4001.c
Herbert Xu da3bc07171 sfc: Replace LRO with GRO 
This patch makes sfc invoke the GRO hooks instead of LRO.  As
GRO has a compatible external interface to LRO this is a very
straightforward replacement.

Everything should appear identical to the user except that the
offload is now controlled by the GRO ethtool option instead of
LRO.  I've kept the lro module parameter as is since that's for
compatibility only.

I have eliminated efx_rx_mk_skb as the GRO layer can take care
of all packets regardless of whether GRO is enabled or not.

So the only case where we don't call GRO is if the packet checksum
is absent.  This is to keep the behaviour changes of the patch to
a minimum.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-21 14:34:06 -08:00

407 lines
11 KiB
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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 pins are also used for I2C, so block that temporarily */
mutex_lock(&efx->i2c_adap.bus_lock);
falcon_read(efx, &reg, GPIO_CTL_REG_KER);
EFX_SET_OWORD_FIELD(reg, GPIO2_OEN, true);
EFX_SET_OWORD_FIELD(reg, GPIO2_OUT, false);
falcon_write(efx, &reg, GPIO_CTL_REG_KER);
msleep(1000);
EFX_SET_OWORD_FIELD(reg, GPIO2_OUT, true);
EFX_SET_OWORD_FIELD(reg, GPIO3_OEN, true);
EFX_SET_OWORD_FIELD(reg, GPIO3_OUT,
!(efx->phy_mode & PHY_MODE_SPECIAL));
falcon_write(efx, &reg, GPIO_CTL_REG_KER);
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 {
efx->phy_mode = new_mode;
if (efx->board_info.type == EFX_BOARD_SFE4001)
err = sfe4001_poweron(efx);
else
err = sfn4111t_reset(efx);
efx_reconfigure_port(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;
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_hwmon_info = {
I2C_BOARD_INFO("max6647", 0x4e),
.irq = -1,
};
int sfn4111t_init(struct efx_nic *efx)
{
int rc;
efx->board_info.hwmon_client =
i2c_new_device(&efx->i2c_adap, &sfn4111t_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;
if (efx->phy_mode & PHY_MODE_SPECIAL)
sfn4111t_reset(efx);
return 0;
fail_hwmon:
i2c_unregister_device(efx->board_info.hwmon_client);
return rc;
}
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