diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/qt202x_phy.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/qt202x_phy.c | 462 |
1 files changed, 462 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/qt202x_phy.c b/drivers/net/ethernet/sfc/qt202x_phy.c new file mode 100644 index 00000000000..7ad97e39740 --- /dev/null +++ b/drivers/net/ethernet/sfc/qt202x_phy.c @@ -0,0 +1,462 @@ +/**************************************************************************** + * Driver for Solarflare Solarstorm network controllers and boards + * Copyright 2006-2010 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. + */ +/* + * Driver for AMCC QT202x SFP+ and XFP adapters; see www.amcc.com for details + */ + +#include <linux/slab.h> +#include <linux/timer.h> +#include <linux/delay.h> +#include "efx.h" +#include "mdio_10g.h" +#include "phy.h" +#include "nic.h" + +#define QT202X_REQUIRED_DEVS (MDIO_DEVS_PCS | \ + MDIO_DEVS_PMAPMD | \ + MDIO_DEVS_PHYXS) + +#define QT202X_LOOPBACKS ((1 << LOOPBACK_PCS) | \ + (1 << LOOPBACK_PMAPMD) | \ + (1 << LOOPBACK_PHYXS_WS)) + +/****************************************************************************/ +/* Quake-specific MDIO registers */ +#define MDIO_QUAKE_LED0_REG (0xD006) + +/* QT2025C only */ +#define PCS_FW_HEARTBEAT_REG 0xd7ee +#define PCS_FW_HEARTB_LBN 0 +#define PCS_FW_HEARTB_WIDTH 8 +#define PCS_FW_PRODUCT_CODE_1 0xd7f0 +#define PCS_FW_VERSION_1 0xd7f3 +#define PCS_FW_BUILD_1 0xd7f6 +#define PCS_UC8051_STATUS_REG 0xd7fd +#define PCS_UC_STATUS_LBN 0 +#define PCS_UC_STATUS_WIDTH 8 +#define PCS_UC_STATUS_FW_SAVE 0x20 +#define PMA_PMD_MODE_REG 0xc301 +#define PMA_PMD_RXIN_SEL_LBN 6 +#define PMA_PMD_FTX_CTRL2_REG 0xc309 +#define PMA_PMD_FTX_STATIC_LBN 13 +#define PMA_PMD_VEND1_REG 0xc001 +#define PMA_PMD_VEND1_LBTXD_LBN 15 +#define PCS_VEND1_REG 0xc000 +#define PCS_VEND1_LBTXD_LBN 5 + +void falcon_qt202x_set_led(struct efx_nic *p, int led, int mode) +{ + int addr = MDIO_QUAKE_LED0_REG + led; + efx_mdio_write(p, MDIO_MMD_PMAPMD, addr, mode); +} + +struct qt202x_phy_data { + enum efx_phy_mode phy_mode; + bool bug17190_in_bad_state; + unsigned long bug17190_timer; + u32 firmware_ver; +}; + +#define QT2022C2_MAX_RESET_TIME 500 +#define QT2022C2_RESET_WAIT 10 + +#define QT2025C_MAX_HEARTB_TIME (5 * HZ) +#define QT2025C_HEARTB_WAIT 100 +#define QT2025C_MAX_FWSTART_TIME (25 * HZ / 10) +#define QT2025C_FWSTART_WAIT 100 + +#define BUG17190_INTERVAL (2 * HZ) + +static int qt2025c_wait_heartbeat(struct efx_nic *efx) +{ + unsigned long timeout = jiffies + QT2025C_MAX_HEARTB_TIME; + int reg, old_counter = 0; + + /* Wait for firmware heartbeat to start */ + for (;;) { + int counter; + reg = efx_mdio_read(efx, MDIO_MMD_PCS, PCS_FW_HEARTBEAT_REG); + if (reg < 0) + return reg; + counter = ((reg >> PCS_FW_HEARTB_LBN) & + ((1 << PCS_FW_HEARTB_WIDTH) - 1)); + if (old_counter == 0) + old_counter = counter; + else if (counter != old_counter) + break; + if (time_after(jiffies, timeout)) { + /* Some cables have EEPROMs that conflict with the + * PHY's on-board EEPROM so it cannot load firmware */ + netif_err(efx, hw, efx->net_dev, + "If an SFP+ direct attach cable is" + " connected, please check that it complies" + " with the SFP+ specification\n"); + return -ETIMEDOUT; + } + msleep(QT2025C_HEARTB_WAIT); + } + + return 0; +} + +static int qt2025c_wait_fw_status_good(struct efx_nic *efx) +{ + unsigned long timeout = jiffies + QT2025C_MAX_FWSTART_TIME; + int reg; + + /* Wait for firmware status to look good */ + for (;;) { + reg = efx_mdio_read(efx, MDIO_MMD_PCS, PCS_UC8051_STATUS_REG); + if (reg < 0) + return reg; + if ((reg & + ((1 << PCS_UC_STATUS_WIDTH) - 1) << PCS_UC_STATUS_LBN) >= + PCS_UC_STATUS_FW_SAVE) + break; + if (time_after(jiffies, timeout)) + return -ETIMEDOUT; + msleep(QT2025C_FWSTART_WAIT); + } + + return 0; +} + +static void qt2025c_restart_firmware(struct efx_nic *efx) +{ + /* Restart microcontroller execution of firmware from RAM */ + efx_mdio_write(efx, 3, 0xe854, 0x00c0); + efx_mdio_write(efx, 3, 0xe854, 0x0040); + msleep(50); +} + +static int qt2025c_wait_reset(struct efx_nic *efx) +{ + int rc; + + rc = qt2025c_wait_heartbeat(efx); + if (rc != 0) + return rc; + + rc = qt2025c_wait_fw_status_good(efx); + if (rc == -ETIMEDOUT) { + /* Bug 17689: occasionally heartbeat starts but firmware status + * code never progresses beyond 0x00. Try again, once, after + * restarting execution of the firmware image. */ + netif_dbg(efx, hw, efx->net_dev, + "bashing QT2025C microcontroller\n"); + qt2025c_restart_firmware(efx); + rc = qt2025c_wait_heartbeat(efx); + if (rc != 0) + return rc; + rc = qt2025c_wait_fw_status_good(efx); + } + + return rc; +} + +static void qt2025c_firmware_id(struct efx_nic *efx) +{ + struct qt202x_phy_data *phy_data = efx->phy_data; + u8 firmware_id[9]; + size_t i; + + for (i = 0; i < sizeof(firmware_id); i++) + firmware_id[i] = efx_mdio_read(efx, MDIO_MMD_PCS, + PCS_FW_PRODUCT_CODE_1 + i); + netif_info(efx, probe, efx->net_dev, + "QT2025C firmware %xr%d v%d.%d.%d.%d [20%02d-%02d-%02d]\n", + (firmware_id[0] << 8) | firmware_id[1], firmware_id[2], + firmware_id[3] >> 4, firmware_id[3] & 0xf, + firmware_id[4], firmware_id[5], + firmware_id[6], firmware_id[7], firmware_id[8]); + phy_data->firmware_ver = ((firmware_id[3] & 0xf0) << 20) | + ((firmware_id[3] & 0x0f) << 16) | + (firmware_id[4] << 8) | firmware_id[5]; +} + +static void qt2025c_bug17190_workaround(struct efx_nic *efx) +{ + struct qt202x_phy_data *phy_data = efx->phy_data; + + /* The PHY can get stuck in a state where it reports PHY_XS and PMA/PMD + * layers up, but PCS down (no block_lock). If we notice this state + * persisting for a couple of seconds, we switch PMA/PMD loopback + * briefly on and then off again, which is normally sufficient to + * recover it. + */ + if (efx->link_state.up || + !efx_mdio_links_ok(efx, MDIO_DEVS_PMAPMD | MDIO_DEVS_PHYXS)) { + phy_data->bug17190_in_bad_state = false; + return; + } + + if (!phy_data->bug17190_in_bad_state) { + phy_data->bug17190_in_bad_state = true; + phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL; + return; + } + + if (time_after_eq(jiffies, phy_data->bug17190_timer)) { + netif_dbg(efx, hw, efx->net_dev, "bashing QT2025C PMA/PMD\n"); + efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1, + MDIO_PMA_CTRL1_LOOPBACK, true); + msleep(100); + efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1, + MDIO_PMA_CTRL1_LOOPBACK, false); + phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL; + } +} + +static int qt2025c_select_phy_mode(struct efx_nic *efx) +{ + struct qt202x_phy_data *phy_data = efx->phy_data; + struct falcon_board *board = falcon_board(efx); + int reg, rc, i; + uint16_t phy_op_mode; + + /* Only 2.0.1.0+ PHY firmware supports the more optimal SFP+ + * Self-Configure mode. Don't attempt any switching if we encounter + * older firmware. */ + if (phy_data->firmware_ver < 0x02000100) + return 0; + + /* In general we will get optimal behaviour in "SFP+ Self-Configure" + * mode; however, that powers down most of the PHY when no module is + * present, so we must use a different mode (any fixed mode will do) + * to be sure that loopbacks will work. */ + phy_op_mode = (efx->loopback_mode == LOOPBACK_NONE) ? 0x0038 : 0x0020; + + /* Only change mode if really necessary */ + reg = efx_mdio_read(efx, 1, 0xc319); + if ((reg & 0x0038) == phy_op_mode) + return 0; + netif_dbg(efx, hw, efx->net_dev, "Switching PHY to mode 0x%04x\n", + phy_op_mode); + + /* This sequence replicates the register writes configured in the boot + * EEPROM (including the differences between board revisions), except + * that the operating mode is changed, and the PHY is prevented from + * unnecessarily reloading the main firmware image again. */ + efx_mdio_write(efx, 1, 0xc300, 0x0000); + /* (Note: this portion of the boot EEPROM sequence, which bit-bashes 9 + * STOPs onto the firmware/module I2C bus to reset it, varies across + * board revisions, as the bus is connected to different GPIO/LED + * outputs on the PHY.) */ + if (board->major == 0 && board->minor < 2) { + efx_mdio_write(efx, 1, 0xc303, 0x4498); + for (i = 0; i < 9; i++) { + efx_mdio_write(efx, 1, 0xc303, 0x4488); + efx_mdio_write(efx, 1, 0xc303, 0x4480); + efx_mdio_write(efx, 1, 0xc303, 0x4490); + efx_mdio_write(efx, 1, 0xc303, 0x4498); + } + } else { + efx_mdio_write(efx, 1, 0xc303, 0x0920); + efx_mdio_write(efx, 1, 0xd008, 0x0004); + for (i = 0; i < 9; i++) { + efx_mdio_write(efx, 1, 0xc303, 0x0900); + efx_mdio_write(efx, 1, 0xd008, 0x0005); + efx_mdio_write(efx, 1, 0xc303, 0x0920); + efx_mdio_write(efx, 1, 0xd008, 0x0004); + } + efx_mdio_write(efx, 1, 0xc303, 0x4900); + } + efx_mdio_write(efx, 1, 0xc303, 0x4900); + efx_mdio_write(efx, 1, 0xc302, 0x0004); + efx_mdio_write(efx, 1, 0xc316, 0x0013); + efx_mdio_write(efx, 1, 0xc318, 0x0054); + efx_mdio_write(efx, 1, 0xc319, phy_op_mode); + efx_mdio_write(efx, 1, 0xc31a, 0x0098); + efx_mdio_write(efx, 3, 0x0026, 0x0e00); + efx_mdio_write(efx, 3, 0x0027, 0x0013); + efx_mdio_write(efx, 3, 0x0028, 0xa528); + efx_mdio_write(efx, 1, 0xd006, 0x000a); + efx_mdio_write(efx, 1, 0xd007, 0x0009); + efx_mdio_write(efx, 1, 0xd008, 0x0004); + /* This additional write is not present in the boot EEPROM. It + * prevents the PHY's internal boot ROM doing another pointless (and + * slow) reload of the firmware image (the microcontroller's code + * memory is not affected by the microcontroller reset). */ + efx_mdio_write(efx, 1, 0xc317, 0x00ff); + /* PMA/PMD loopback sets RXIN to inverse polarity and the firmware + * restart doesn't reset it. We need to do that ourselves. */ + efx_mdio_set_flag(efx, 1, PMA_PMD_MODE_REG, + 1 << PMA_PMD_RXIN_SEL_LBN, false); + efx_mdio_write(efx, 1, 0xc300, 0x0002); + msleep(20); + + /* Restart microcontroller execution of firmware from RAM */ + qt2025c_restart_firmware(efx); + + /* Wait for the microcontroller to be ready again */ + rc = qt2025c_wait_reset(efx); + if (rc < 0) { + netif_err(efx, hw, efx->net_dev, + "PHY microcontroller reset during mode switch " + "timed out\n"); + return rc; + } + + return 0; +} + +static int qt202x_reset_phy(struct efx_nic *efx) +{ + int rc; + + if (efx->phy_type == PHY_TYPE_QT2025C) { + /* Wait for the reset triggered by falcon_reset_hw() + * to complete */ + rc = qt2025c_wait_reset(efx); + if (rc < 0) + goto fail; + } else { + /* Reset the PHYXS MMD. This is documented as doing + * a complete soft reset. */ + rc = efx_mdio_reset_mmd(efx, MDIO_MMD_PHYXS, + QT2022C2_MAX_RESET_TIME / + QT2022C2_RESET_WAIT, + QT2022C2_RESET_WAIT); + if (rc < 0) + goto fail; + } + + /* Wait 250ms for the PHY to complete bootup */ + msleep(250); + + falcon_board(efx)->type->init_phy(efx); + + return 0; + + fail: + netif_err(efx, hw, efx->net_dev, "PHY reset timed out\n"); + return rc; +} + +static int qt202x_phy_probe(struct efx_nic *efx) +{ + struct qt202x_phy_data *phy_data; + + phy_data = kzalloc(sizeof(struct qt202x_phy_data), GFP_KERNEL); + if (!phy_data) + return -ENOMEM; + efx->phy_data = phy_data; + phy_data->phy_mode = efx->phy_mode; + phy_data->bug17190_in_bad_state = false; + phy_data->bug17190_timer = 0; + + efx->mdio.mmds = QT202X_REQUIRED_DEVS; + efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22; + efx->loopback_modes = QT202X_LOOPBACKS | FALCON_XMAC_LOOPBACKS; + return 0; +} + +static int qt202x_phy_init(struct efx_nic *efx) +{ + u32 devid; + int rc; + + rc = qt202x_reset_phy(efx); + if (rc) { + netif_err(efx, probe, efx->net_dev, "PHY init failed\n"); + return rc; + } + + devid = efx_mdio_read_id(efx, MDIO_MMD_PHYXS); + netif_info(efx, probe, efx->net_dev, + "PHY ID reg %x (OUI %06x model %02x revision %x)\n", + devid, efx_mdio_id_oui(devid), efx_mdio_id_model(devid), + efx_mdio_id_rev(devid)); + + if (efx->phy_type == PHY_TYPE_QT2025C) + qt2025c_firmware_id(efx); + + return 0; +} + +static int qt202x_link_ok(struct efx_nic *efx) +{ + return efx_mdio_links_ok(efx, QT202X_REQUIRED_DEVS); +} + +static bool qt202x_phy_poll(struct efx_nic *efx) +{ + bool was_up = efx->link_state.up; + + efx->link_state.up = qt202x_link_ok(efx); + efx->link_state.speed = 10000; + efx->link_state.fd = true; + efx->link_state.fc = efx->wanted_fc; + + if (efx->phy_type == PHY_TYPE_QT2025C) + qt2025c_bug17190_workaround(efx); + + return efx->link_state.up != was_up; +} + +static int qt202x_phy_reconfigure(struct efx_nic *efx) +{ + struct qt202x_phy_data *phy_data = efx->phy_data; + + if (efx->phy_type == PHY_TYPE_QT2025C) { + int rc = qt2025c_select_phy_mode(efx); + if (rc) + return rc; + + /* There are several different register bits which can + * disable TX (and save power) on direct-attach cables + * or optical transceivers, varying somewhat between + * firmware versions. Only 'static mode' appears to + * cover everything. */ + mdio_set_flag( + &efx->mdio, efx->mdio.prtad, MDIO_MMD_PMAPMD, + PMA_PMD_FTX_CTRL2_REG, 1 << PMA_PMD_FTX_STATIC_LBN, + efx->phy_mode & PHY_MODE_TX_DISABLED || + efx->phy_mode & PHY_MODE_LOW_POWER || + efx->loopback_mode == LOOPBACK_PCS || + efx->loopback_mode == LOOPBACK_PMAPMD); + } else { + /* Reset the PHY when moving from tx off to tx on */ + if (!(efx->phy_mode & PHY_MODE_TX_DISABLED) && + (phy_data->phy_mode & PHY_MODE_TX_DISABLED)) + qt202x_reset_phy(efx); + + efx_mdio_transmit_disable(efx); + } + + efx_mdio_phy_reconfigure(efx); + + phy_data->phy_mode = efx->phy_mode; + + return 0; +} + +static void qt202x_phy_get_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd) +{ + mdio45_ethtool_gset(&efx->mdio, ecmd); +} + +static void qt202x_phy_remove(struct efx_nic *efx) +{ + /* Free the context block */ + kfree(efx->phy_data); + efx->phy_data = NULL; +} + +const struct efx_phy_operations falcon_qt202x_phy_ops = { + .probe = qt202x_phy_probe, + .init = qt202x_phy_init, + .reconfigure = qt202x_phy_reconfigure, + .poll = qt202x_phy_poll, + .fini = efx_port_dummy_op_void, + .remove = qt202x_phy_remove, + .get_settings = qt202x_phy_get_settings, + .set_settings = efx_mdio_set_settings, + .test_alive = efx_mdio_test_alive, +}; |