drivers/net/sfc/qt202x_phy.c - arm/linux-arm64-legacy - Git at Google

 /****************************************************************************
  * Driver for Solarflare Solarstorm network controllers and boards
  * Copyright 2006-2008 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.
  */
 /*
  * Driver for AMCC QT202x SFP+ and XFP adapters; see www.amcc.com for details
  */

 #include <linux/timer.h>
 #include <linux/delay.h>
 #include "efx.h"
 #include "mdio_10g.h"
 #include "phy.h"
 #include "falcon.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_NETWORK))

 /****************************************************************************/
 /* 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_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_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;
 };

 #define QT2022C2_MAX_RESET_TIME 500
 #define QT2022C2_RESET_WAIT 10

 static int qt2025c_wait_reset(struct efx_nic *efx)
 {
 	unsigned long timeout = jiffies + 10 * HZ;
 	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))
 			return -ETIMEDOUT;
 		msleep(10);
 	}

 	/* 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(100);
 	}

 	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);

 	/* Check that all the MMDs we expect are present and responding. We
 	 * expect faults on some if the link is down, but not on the PHY XS */
 	rc = efx_mdio_check_mmds(efx, QT202X_REQUIRED_DEVS, MDIO_DEVS_PHYXS);
 	if (rc < 0)
 		goto fail;

 	efx->board_info.init_leds(efx);

 	return rc;

  fail:
 	EFX_ERR(efx, "PHY reset timed out\n");
 	return rc;
 }

 static int qt202x_phy_init(struct efx_nic *efx)
 {
 	struct qt202x_phy_data *phy_data;
 	u32 devid = efx_mdio_read_id(efx, MDIO_MMD_PHYXS);
 	int rc;

 	phy_data = kzalloc(sizeof(struct qt202x_phy_data), GFP_KERNEL);
 	if (!phy_data)
 		return -ENOMEM;
 	efx->phy_data = phy_data;

 	EFX_INFO(efx, "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));

 	phy_data->phy_mode = efx->phy_mode;

 	rc = qt202x_reset_phy(efx);

 	EFX_INFO(efx, "PHY init %s.\n",
 		 rc ? "failed" : "successful");
 	if (rc < 0)
 		goto fail;

 	return 0;

  fail:
 	kfree(efx->phy_data);
 	efx->phy_data = NULL;
 	return rc;
 }

 static void qt202x_phy_clear_interrupt(struct efx_nic *efx)
 {
 	/* Read to clear link status alarm */
 	efx_mdio_read(efx, MDIO_MMD_PMAPMD, MDIO_PMA_LASI_STAT);
 }

 static int qt202x_link_ok(struct efx_nic *efx)
 {
 	return efx_mdio_links_ok(efx, QT202X_REQUIRED_DEVS);
 }

 static void qt202x_phy_poll(struct efx_nic *efx)
 {
 	int link_up = qt202x_link_ok(efx);
 	/* Simulate a PHY event if link state has changed */
 	if (link_up != efx->link_up)
 		falcon_sim_phy_event(efx);
 }

 static void qt202x_phy_reconfigure(struct efx_nic *efx)
 {
 	struct qt202x_phy_data *phy_data = efx->phy_data;

 	if (efx->phy_type == PHY_TYPE_QT2025C) {
 		/* 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;
 	efx->link_up = qt202x_link_ok(efx);
 	efx->link_speed = 10000;
 	efx->link_fd = true;
 	efx->link_fc = efx->wanted_fc;
 }

 static void qt202x_phy_get_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
 {
 	mdio45_ethtool_gset(&efx->mdio, ecmd);
 }

 static void qt202x_phy_fini(struct efx_nic *efx)
 {
 	/* Clobber the LED if it was blinking */
 	efx->board_info.blink(efx, false);

 	/* Free the context block */
 	kfree(efx->phy_data);
 	efx->phy_data = NULL;
 }

 struct efx_phy_operations falcon_qt202x_phy_ops = {
 	.macs		 = EFX_XMAC,
 	.init		 = qt202x_phy_init,
 	.reconfigure	 = qt202x_phy_reconfigure,
 	.poll	     	 = qt202x_phy_poll,
 	.fini	  	 = qt202x_phy_fini,
 	.clear_interrupt = qt202x_phy_clear_interrupt,
 	.get_settings	 = qt202x_phy_get_settings,
 	.set_settings	 = efx_mdio_set_settings,
 	.mmds            = QT202X_REQUIRED_DEVS,
 	.loopbacks       = QT202X_LOOPBACKS,
 };
	/****************************************************************************
	* Driver for Solarflare Solarstorm network controllers and boards
	* Copyright 2006-2008 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.
	*/
	/*
	* Driver for AMCC QT202x SFP+ and XFP adapters; see www.amcc.com for details
	*/

	#include <linux/timer.h>
	#include <linux/delay.h>
	#include "efx.h"
	#include "mdio_10g.h"
	#include "phy.h"
	#include "falcon.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_NETWORK))

	/****************************************************************************/
	/* 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_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_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;
	};

	#define QT2022C2_MAX_RESET_TIME 500
	#define QT2022C2_RESET_WAIT 10

	static int qt2025c_wait_reset(struct efx_nic *efx)
	{
	unsigned long timeout = jiffies + 10 * HZ;
	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))
	return -ETIMEDOUT;
	msleep(10);
	}

	/* 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(100);
	}

	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);

	/* Check that all the MMDs we expect are present and responding. We
	* expect faults on some if the link is down, but not on the PHY XS */
	rc = efx_mdio_check_mmds(efx, QT202X_REQUIRED_DEVS, MDIO_DEVS_PHYXS);
	if (rc < 0)
	goto fail;

	efx->board_info.init_leds(efx);

	return rc;

	fail:
	EFX_ERR(efx, "PHY reset timed out\n");
	return rc;
	}

	static int qt202x_phy_init(struct efx_nic *efx)
	{
	struct qt202x_phy_data *phy_data;
	u32 devid = efx_mdio_read_id(efx, MDIO_MMD_PHYXS);
	int rc;

	phy_data = kzalloc(sizeof(struct qt202x_phy_data), GFP_KERNEL);
	if (!phy_data)
	return -ENOMEM;
	efx->phy_data = phy_data;

	EFX_INFO(efx, "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));

	phy_data->phy_mode = efx->phy_mode;

	rc = qt202x_reset_phy(efx);

	EFX_INFO(efx, "PHY init %s.\n",
	rc ? "failed" : "successful");
	if (rc < 0)
	goto fail;

	return 0;

	fail:
	kfree(efx->phy_data);
	efx->phy_data = NULL;
	return rc;
	}

	static void qt202x_phy_clear_interrupt(struct efx_nic *efx)
	{
	/* Read to clear link status alarm */
	efx_mdio_read(efx, MDIO_MMD_PMAPMD, MDIO_PMA_LASI_STAT);
	}

	static int qt202x_link_ok(struct efx_nic *efx)
	{
	return efx_mdio_links_ok(efx, QT202X_REQUIRED_DEVS);
	}

	static void qt202x_phy_poll(struct efx_nic *efx)
	{
	int link_up = qt202x_link_ok(efx);
	/* Simulate a PHY event if link state has changed */
	if (link_up != efx->link_up)
	falcon_sim_phy_event(efx);
	}

	static void qt202x_phy_reconfigure(struct efx_nic *efx)
	{
	struct qt202x_phy_data *phy_data = efx->phy_data;

	if (efx->phy_type == PHY_TYPE_QT2025C) {
	/* 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;
	efx->link_up = qt202x_link_ok(efx);
	efx->link_speed = 10000;
	efx->link_fd = true;
	efx->link_fc = efx->wanted_fc;
	}

	static void qt202x_phy_get_settings(struct efx_nic efx, struct ethtool_cmd ecmd)
	{
	mdio45_ethtool_gset(&efx->mdio, ecmd);
	}

	static void qt202x_phy_fini(struct efx_nic *efx)
	{
	/* Clobber the LED if it was blinking */
	efx->board_info.blink(efx, false);

	/* Free the context block */
	kfree(efx->phy_data);
	efx->phy_data = NULL;
	}

	struct efx_phy_operations falcon_qt202x_phy_ops = {
	.macs = EFX_XMAC,
	.init = qt202x_phy_init,
	.reconfigure = qt202x_phy_reconfigure,
	.poll = qt202x_phy_poll,
	.fini = qt202x_phy_fini,
	.clear_interrupt = qt202x_phy_clear_interrupt,
	.get_settings = qt202x_phy_get_settings,
	.set_settings = efx_mdio_set_settings,
	.mmds = QT202X_REQUIRED_DEVS,
	.loopbacks = QT202X_LOOPBACKS,
	};