/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2007 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 NIC: driver code for the PCA9539 I/O expander that
* controls the PHY power rails, and for the MAX6647 temp. sensor used to check
* the PHY
*/
#include <linux/delay.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"
/**************************************************************************
*
* 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 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;
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, 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;
efx_oword_t reg;
/* Ensure that XGXS and XAUI SerDes are held in reset */
EFX_POPULATE_OWORD_7(reg, XX_PWRDNA_EN, 1,
XX_PWRDNB_EN, 1,
XX_RSTPLLAB_EN, 1,
XX_RESETA_EN, 1,
XX_RESETB_EN, 1,
XX_RSTXGXSRX_EN, 1,
XX_RSTXGXSTX_EN, 1);
falcon_write(efx, ®, XX_PWR_RST_REG);
udelay(10);
/* Clear any previous over-temperature alert */
rc = i2c_smbus_read_byte_data(hwmon_client, 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;
}
/* 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.
*/
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;
err = sfe4001_poweron(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);
}
/* 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)
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);
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;
}
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.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(hwmon_client);
return rc;
}
