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 000000000000..7ad97e397406
--- /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,
+};