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linux/drivers/net/sfc/sfe4001.c
Ben Hutchings 37b5a60335 sfc: Use kernel I2C system and i2c-algo-bit driver 
Remove our own implementation of I2C bit-banging.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2008-05-30 22:18:10 -04:00

273 lines
7.4 KiB
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/****************************************************************************
* 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 "efx.h"
#include "phy.h"
#include "boards.h"
#include "falcon.h"
#include "falcon_hwdefs.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 void sfe4001_fini(struct efx_nic *efx)
{
EFX_INFO(efx, "%s\n", __func__);
sfe4001_poweroff(efx);
i2c_unregister_device(efx->board_info.ioexp_client);
i2c_unregister_device(efx->board_info.hwmon_client);
}
/* The P0_EN_3V3X line on SFE4001 boards (from A2 onward) is connected
* to the FLASH_CFG_1 input on the DSP. We must keep it high at power-
* up to allow writing the flash (done through MDIO from userland).
*/
unsigned int sfe4001_phy_flash_cfg;
module_param_named(phy_flash_cfg, sfe4001_phy_flash_cfg, uint, 0444);
MODULE_PARM_DESC(phy_flash_cfg,
"Force PHY to enter flash configuration mode");
/* 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, *ioexp_client;
unsigned int count;
int rc;
u8 out;
efx_dword_t reg;
hwmon_client = i2c_new_dummy(&efx->i2c_adap, MAX6647);
if (!hwmon_client)
return -EIO;
efx->board_info.hwmon_client = hwmon_client;
ioexp_client = i2c_new_dummy(&efx->i2c_adap, PCA9539);
if (!ioexp_client) {
rc = -EIO;
goto fail_hwmon;
}
efx->board_info.ioexp_client = ioexp_client;
/* 10Xpress has fixed-function LED pins, so there is no board-specific
* blink code. */
efx->board_info.blink = tenxpress_phy_blink;
/* Ensure that XGXS and XAUI SerDes are held in reset */
EFX_POPULATE_DWORD_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_xmac_writel(efx, &reg, XX_PWR_RST_REG_MAC);
udelay(10);
efx->board_info.fini = sfe4001_fini;
/* 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;
}
/* Clear any previous over-temperature alert */
rc = i2c_smbus_read_byte_data(hwmon_client, RSL);
if (rc < 0)
goto fail_ioexp;
/* Enable port 0 and port 1 outputs on IO expander */
rc = i2c_smbus_write_byte_data(ioexp_client, P0_CONFIG, 0x00);
if (rc)
goto fail_ioexp;
rc = i2c_smbus_write_byte_data(ioexp_client, P1_CONFIG,
0xff & ~(1 << P1_SPARE_LBN));
if (rc)
goto fail_on;
/* Turn all power off then wait 1 sec. This ensures PHY is reset */
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));
rc = i2c_smbus_write_byte_data(ioexp_client, P0_OUT, out);
if (rc)
goto fail_on;
schedule_timeout_uninterruptible(HZ);
count = 0;
do {
/* 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 (sfe4001_phy_flash_cfg)
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 power (attempt %d)...\n", count);
schedule_timeout_uninterruptible(HZ);
/* Check DSP is powered */
rc = i2c_smbus_read_byte_data(ioexp_client, P1_IN);
if (rc < 0)
goto fail_on;
if (rc & (1 << P1_AFE_PWD_LBN))
goto done;
/* DSP doesn't look powered in flash config mode */
if (sfe4001_phy_flash_cfg)
goto done;
} while (++count < 20);
EFX_INFO(efx, "timed out waiting for power\n");
rc = -ETIMEDOUT;
goto fail_on;
done:
EFX_INFO(efx, "PHY is powered on\n");
return 0;
fail_on:
sfe4001_poweroff(efx);
fail_ioexp:
i2c_unregister_device(ioexp_client);
fail_hwmon:
i2c_unregister_device(hwmon_client);
return rc;
}
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