[deliverable/linux.git] / drivers / net / sfc / qt202x_phy.c

/****************************************************************************
 * Driver for Solarflare Solarstorm network controllers and boards
 * Copyright 2006-2009 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 "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_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))
			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. */
		EFX_LOG(efx, "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);
	EFX_INFO(efx, "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)) {
		EFX_LOG(efx, "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;
	EFX_LOG(efx, "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);
	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) {
		EFX_ERR(efx, "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);

	/* 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;

	falcon_board(efx)->type->init_phy(efx);

	return rc;

 fail:
	EFX_ERR(efx, "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) {
		EFX_ERR(efx, "PHY init failed\n");
		return rc;
	}

	devid = efx_mdio_read_id(efx, MDIO_MMD_PHYXS);
	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));

	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;
}

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,
};
Commit	Line	Data
8ceee660 BH	1	/****************************************************************************
8ceee660 BH	2	* Driver for Solarflare Solarstorm network controllers and boards
906bb26c	3	* Copyright 2006-2009 Solarflare Communications Inc.
8ceee660 BH	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 as published
	7	* by the Free Software Foundation, incorporated herein by reference.
	8	*/
	9	/*
b37b62fe	10	* Driver for AMCC QT202x SFP+ and XFP adapters; see www.amcc.com for details
8ceee660 BH	11	*/
	12
	13	#include <linux/timer.h>
	14	#include <linux/delay.h>
	15	#include "efx.h"
8ceee660	16	#include "mdio_10g.h"
8ceee660	17	#include "phy.h"
744093c9	18	#include "nic.h"
8ceee660	19
b37b62fe BH	20	#define QT202X_REQUIRED_DEVS (MDIO_DEVS_PCS \| \
	21	MDIO_DEVS_PMAPMD \| \
	22	MDIO_DEVS_PHYXS)
8ceee660	23
b37b62fe BH	24	#define QT202X_LOOPBACKS ((1 << LOOPBACK_PCS) \| \
b37b62fe BH	25	(1 << LOOPBACK_PMAPMD) \| \
e58f69f4	26	(1 << LOOPBACK_PHYXS_WS))
3273c2e8	27
8ceee660 BH	28	/****************************************************************************/
	29	/* Quake-specific MDIO registers */
	30	#define MDIO_QUAKE_LED0_REG (0xD006)
	31
d2d2c373 BH	32	/* QT2025C only */
	33	#define PCS_FW_HEARTBEAT_REG 0xd7ee
	34	#define PCS_FW_HEARTB_LBN 0
	35	#define PCS_FW_HEARTB_WIDTH 8
0d83b2f6 MS	36	#define PCS_FW_PRODUCT_CODE_1 0xd7f0
	37	#define PCS_FW_VERSION_1 0xd7f3
	38	#define PCS_FW_BUILD_1 0xd7f6
d2d2c373 BH	39	#define PCS_UC8051_STATUS_REG 0xd7fd
	40	#define PCS_UC_STATUS_LBN 0
	41	#define PCS_UC_STATUS_WIDTH 8
	42	#define PCS_UC_STATUS_FW_SAVE 0x20
	43	#define PMA_PMD_FTX_CTRL2_REG 0xc309
	44	#define PMA_PMD_FTX_STATIC_LBN 13
	45	#define PMA_PMD_VEND1_REG 0xc001
	46	#define PMA_PMD_VEND1_LBTXD_LBN 15
	47	#define PCS_VEND1_REG 0xc000
	48	#define PCS_VEND1_LBTXD_LBN 5
	49
b37b62fe	50	void falcon_qt202x_set_led(struct efx_nic *p, int led, int mode)
8ceee660 BH	51	{
8ceee660 BH	52	int addr = MDIO_QUAKE_LED0_REG + led;
68e7f45e	53	efx_mdio_write(p, MDIO_MMD_PMAPMD, addr, mode);
8ceee660 BH	54	}
8ceee660 BH	55
b37b62fe	56	struct qt202x_phy_data {
f8b87c17	57	enum efx_phy_mode phy_mode;
17d6aeaf MS	58	bool bug17190_in_bad_state;
17d6aeaf MS	59	unsigned long bug17190_timer;
0d83b2f6	60	u32 firmware_ver;
3273c2e8 BH	61	};
3273c2e8 BH	62
b37b62fe BH	63	#define QT2022C2_MAX_RESET_TIME 500
b37b62fe BH	64	#define QT2022C2_RESET_WAIT 10
8ceee660	65
1a1284ef MS	66	#define QT2025C_MAX_HEARTB_TIME (5 * HZ)
	67	#define QT2025C_HEARTB_WAIT 100
	68	#define QT2025C_MAX_FWSTART_TIME (25 * HZ / 10)
	69	#define QT2025C_FWSTART_WAIT 100
	70
17d6aeaf MS	71	#define BUG17190_INTERVAL (2 * HZ)
17d6aeaf MS	72
1a1284ef	73	static int qt2025c_wait_heartbeat(struct efx_nic *efx)
d2d2c373	74	{
1a1284ef	75	unsigned long timeout = jiffies + QT2025C_MAX_HEARTB_TIME;
d2d2c373 BH	76	int reg, old_counter = 0;
	77
	78	/* Wait for firmware heartbeat to start */
	79	for (;;) {
	80	int counter;
68e7f45e	81	reg = efx_mdio_read(efx, MDIO_MMD_PCS, PCS_FW_HEARTBEAT_REG);
d2d2c373 BH	82	if (reg < 0)
	83	return reg;
	84	counter = ((reg >> PCS_FW_HEARTB_LBN) &
	85	((1 << PCS_FW_HEARTB_WIDTH) - 1));
	86	if (old_counter == 0)
	87	old_counter = counter;
	88	else if (counter != old_counter)
	89	break;
	90	if (time_after(jiffies, timeout))
	91	return -ETIMEDOUT;
1a1284ef	92	msleep(QT2025C_HEARTB_WAIT);
d2d2c373 BH	93	}
d2d2c373 BH	94
1a1284ef MS	95	return 0;
	96	}
	97
	98	static int qt2025c_wait_fw_status_good(struct efx_nic *efx)
	99	{
	100	unsigned long timeout = jiffies + QT2025C_MAX_FWSTART_TIME;
	101	int reg;
	102
d2d2c373 BH	103	/* Wait for firmware status to look good */
d2d2c373 BH	104	for (;;) {
68e7f45e	105	reg = efx_mdio_read(efx, MDIO_MMD_PCS, PCS_UC8051_STATUS_REG);
d2d2c373 BH	106	if (reg < 0)
	107	return reg;
	108	if ((reg &
	109	((1 << PCS_UC_STATUS_WIDTH) - 1) << PCS_UC_STATUS_LBN) >=
	110	PCS_UC_STATUS_FW_SAVE)
	111	break;
	112	if (time_after(jiffies, timeout))
	113	return -ETIMEDOUT;
1a1284ef	114	msleep(QT2025C_FWSTART_WAIT);
d2d2c373 BH	115	}
	116
	117	return 0;
	118	}
	119
1a1284ef MS	120	static void qt2025c_restart_firmware(struct efx_nic *efx)
	121	{
	122	/* Restart microcontroller execution of firmware from RAM */
	123	efx_mdio_write(efx, 3, 0xe854, 0x00c0);
	124	efx_mdio_write(efx, 3, 0xe854, 0x0040);
	125	msleep(50);
	126	}
	127
	128	static int qt2025c_wait_reset(struct efx_nic *efx)
	129	{
	130	int rc;
	131
	132	rc = qt2025c_wait_heartbeat(efx);
	133	if (rc != 0)
	134	return rc;
	135
	136	rc = qt2025c_wait_fw_status_good(efx);
	137	if (rc == -ETIMEDOUT) {
	138	/* Bug 17689: occasionally heartbeat starts but firmware status
	139	* code never progresses beyond 0x00. Try again, once, after
	140	* restarting execution of the firmware image. */
	141	EFX_LOG(efx, "bashing QT2025C microcontroller\n");
	142	qt2025c_restart_firmware(efx);
	143	rc = qt2025c_wait_heartbeat(efx);
	144	if (rc != 0)
	145	return rc;
	146	rc = qt2025c_wait_fw_status_good(efx);
	147	}
	148
	149	return rc;
	150	}
	151
0d83b2f6 MS	152	static void qt2025c_firmware_id(struct efx_nic *efx)
	153	{
	154	struct qt202x_phy_data *phy_data = efx->phy_data;
	155	u8 firmware_id[9];
	156	size_t i;
	157
	158	for (i = 0; i < sizeof(firmware_id); i++)
	159	firmware_id[i] = efx_mdio_read(efx, MDIO_MMD_PCS,
	160	PCS_FW_PRODUCT_CODE_1 + i);
	161	EFX_INFO(efx, "QT2025C firmware %xr%d v%d.%d.%d.%d [20%02d-%02d-%02d]\n",
	162	(firmware_id[0] << 8) \| firmware_id[1], firmware_id[2],
	163	firmware_id[3] >> 4, firmware_id[3] & 0xf,
	164	firmware_id[4], firmware_id[5],
	165	firmware_id[6], firmware_id[7], firmware_id[8]);
	166	phy_data->firmware_ver = ((firmware_id[3] & 0xf0) << 20) \|
	167	((firmware_id[3] & 0x0f) << 16) \|
	168	(firmware_id[4] << 8) \| firmware_id[5];
	169	}
	170
17d6aeaf MS	171	static void qt2025c_bug17190_workaround(struct efx_nic *efx)
	172	{
	173	struct qt202x_phy_data *phy_data = efx->phy_data;
	174
	175	/* The PHY can get stuck in a state where it reports PHY_XS and PMA/PMD
	176	* layers up, but PCS down (no block_lock). If we notice this state
	177	* persisting for a couple of seconds, we switch PMA/PMD loopback
	178	* briefly on and then off again, which is normally sufficient to
	179	* recover it.
	180	*/
	181	if (efx->link_state.up \|\|
	182	!efx_mdio_links_ok(efx, MDIO_DEVS_PMAPMD \| MDIO_DEVS_PHYXS)) {
	183	phy_data->bug17190_in_bad_state = false;
	184	return;
	185	}
	186
	187	if (!phy_data->bug17190_in_bad_state) {
	188	phy_data->bug17190_in_bad_state = true;
	189	phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL;
	190	return;
	191	}
	192
	193	if (time_after_eq(jiffies, phy_data->bug17190_timer)) {
	194	EFX_LOG(efx, "bashing QT2025C PMA/PMD\n");
	195	efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1,
	196	MDIO_PMA_CTRL1_LOOPBACK, true);
	197	msleep(100);
	198	efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1,
	199	MDIO_PMA_CTRL1_LOOPBACK, false);
	200	phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL;
	201	}
	202	}
	203
0d83b2f6 MS	204	static int qt2025c_select_phy_mode(struct efx_nic *efx)
	205	{
	206	struct qt202x_phy_data *phy_data = efx->phy_data;
	207	struct falcon_board *board = falcon_board(efx);
	208	int reg, rc, i;
	209	uint16_t phy_op_mode;
	210
	211	/* Only 2.0.1.0+ PHY firmware supports the more optimal SFP+
	212	* Self-Configure mode. Don't attempt any switching if we encounter
	213	* older firmware. */
	214	if (phy_data->firmware_ver < 0x02000100)
	215	return 0;
	216
	217	/* In general we will get optimal behaviour in "SFP+ Self-Configure"
	218	* mode; however, that powers down most of the PHY when no module is
	219	* present, so we must use a different mode (any fixed mode will do)
	220	* to be sure that loopbacks will work. */
	221	phy_op_mode = (efx->loopback_mode == LOOPBACK_NONE) ? 0x0038 : 0x0020;
	222
	223	/* Only change mode if really necessary */
	224	reg = efx_mdio_read(efx, 1, 0xc319);
	225	if ((reg & 0x0038) == phy_op_mode)
	226	return 0;
	227	EFX_LOG(efx, "Switching PHY to mode 0x%04x\n", phy_op_mode);
	228
	229	/* This sequence replicates the register writes configured in the boot
	230	* EEPROM (including the differences between board revisions), except
	231	* that the operating mode is changed, and the PHY is prevented from
	232	* unnecessarily reloading the main firmware image again. */
	233	efx_mdio_write(efx, 1, 0xc300, 0x0000);
	234	/* (Note: this portion of the boot EEPROM sequence, which bit-bashes 9
	235	* STOPs onto the firmware/module I2C bus to reset it, varies across
	236	* board revisions, as the bus is connected to different GPIO/LED
	237	* outputs on the PHY.) */
	238	if (board->major == 0 && board->minor < 2) {
	239	efx_mdio_write(efx, 1, 0xc303, 0x4498);
	240	for (i = 0; i < 9; i++) {
	241	efx_mdio_write(efx, 1, 0xc303, 0x4488);
	242	efx_mdio_write(efx, 1, 0xc303, 0x4480);
	243	efx_mdio_write(efx, 1, 0xc303, 0x4490);
	244	efx_mdio_write(efx, 1, 0xc303, 0x4498);
	245	}
	246	} else {
	247	efx_mdio_write(efx, 1, 0xc303, 0x0920);
	248	efx_mdio_write(efx, 1, 0xd008, 0x0004);
	249	for (i = 0; i < 9; i++) {
	250	efx_mdio_write(efx, 1, 0xc303, 0x0900);
	251	efx_mdio_write(efx, 1, 0xd008, 0x0005);
	252	efx_mdio_write(efx, 1, 0xc303, 0x0920);
	253	efx_mdio_write(efx, 1, 0xd008, 0x0004);
	254	}
	255	efx_mdio_write(efx, 1, 0xc303, 0x4900);
	256	}
	257	efx_mdio_write(efx, 1, 0xc303, 0x4900);
	258	efx_mdio_write(efx, 1, 0xc302, 0x0004);
	259	efx_mdio_write(efx, 1, 0xc316, 0x0013);
	260	efx_mdio_write(efx, 1, 0xc318, 0x0054);
	261	efx_mdio_write(efx, 1, 0xc319, phy_op_mode);
	262	efx_mdio_write(efx, 1, 0xc31a, 0x0098);
	263	efx_mdio_write(efx, 3, 0x0026, 0x0e00);
	264	efx_mdio_write(efx, 3, 0x0027, 0x0013);
	265	efx_mdio_write(efx, 3, 0x0028, 0xa528);
	266	efx_mdio_write(efx, 1, 0xd006, 0x000a);
	267	efx_mdio_write(efx, 1, 0xd007, 0x0009);
268	efx_mdio_write(efx, 1, 0xd008, 0x0004);
269	/* This additional write is not present in the boot EEPROM. It
270	* prevents the PHY's internal boot ROM doing another pointless (and
271	* slow) reload of the firmware image (the microcontroller's code
272	* memory is not affected by the microcontroller reset). */
273	efx_mdio_write(efx, 1, 0xc317, 0x00ff);
274	efx_mdio_write(efx, 1, 0xc300, 0x0002);
275	msleep(20);
276
1a1284ef MS	277	/* Restart microcontroller execution of firmware from RAM */
1a1284ef MS	278	qt2025c_restart_firmware(efx);
0d83b2f6 MS	279
	280	/* Wait for the microcontroller to be ready again */
	281	rc = qt2025c_wait_reset(efx);
	282	if (rc < 0) {
	283	EFX_ERR(efx, "PHY microcontroller reset during mode switch "
	284	"timed out\n");
	285	return rc;
	286	}
	287
	288	return 0;
	289	}
	290
b37b62fe	291	static int qt202x_reset_phy(struct efx_nic *efx)
8ceee660 BH	292	{
	293	int rc;
	294
d2d2c373	295	if (efx->phy_type == PHY_TYPE_QT2025C) {
5afaa753 BH	296	/* Wait for the reset triggered by falcon_reset_hw()
5afaa753 BH	297	* to complete */
d2d2c373 BH	298	rc = qt2025c_wait_reset(efx);
	299	if (rc < 0)
	300	goto fail;
5afaa753 BH	301	} else {
	302	/* Reset the PHYXS MMD. This is documented as doing
	303	* a complete soft reset. */
	304	rc = efx_mdio_reset_mmd(efx, MDIO_MMD_PHYXS,
b37b62fe BH	305	QT2022C2_MAX_RESET_TIME /
	306	QT2022C2_RESET_WAIT,
	307	QT2022C2_RESET_WAIT);
5afaa753 BH	308	if (rc < 0)
5afaa753 BH	309	goto fail;
d2d2c373 BH	310	}
d2d2c373 BH	311
8ceee660 BH	312	/* Wait 250ms for the PHY to complete bootup */
	313	msleep(250);
	314
	315	/* Check that all the MMDs we expect are present and responding. We
	316	* expect faults on some if the link is down, but not on the PHY XS */
b37b62fe	317	rc = efx_mdio_check_mmds(efx, QT202X_REQUIRED_DEVS, MDIO_DEVS_PHYXS);
8ceee660 BH	318	if (rc < 0)
	319	goto fail;
	320
44838a44	321	falcon_board(efx)->type->init_phy(efx);
8ceee660 BH	322
	323	return rc;
	324
	325	fail:
f794fd44	326	EFX_ERR(efx, "PHY reset timed out\n");
8ceee660 BH	327	return rc;
	328	}
	329
c1c4f453 BH	330	static int qt202x_phy_probe(struct efx_nic *efx)
c1c4f453 BH	331	{
ff3b00a0 SH	332	struct qt202x_phy_data *phy_data;
	333
	334	phy_data = kzalloc(sizeof(struct qt202x_phy_data), GFP_KERNEL);
	335	if (!phy_data)
	336	return -ENOMEM;
	337	efx->phy_data = phy_data;
	338	phy_data->phy_mode = efx->phy_mode;
17d6aeaf MS	339	phy_data->bug17190_in_bad_state = false;
17d6aeaf MS	340	phy_data->bug17190_timer = 0;
ff3b00a0	341
c1c4f453 BH	342	efx->mdio.mmds = QT202X_REQUIRED_DEVS;
	343	efx->mdio.mode_support = MDIO_SUPPORTS_C45 \| MDIO_EMULATE_C22;
	344	efx->loopback_modes = QT202X_LOOPBACKS \| FALCON_XMAC_LOOPBACKS;
	345	return 0;
	346	}
	347
b37b62fe	348	static int qt202x_phy_init(struct efx_nic *efx)
8ceee660	349	{
47c3d19f	350	u32 devid;
8ceee660 BH	351	int rc;
8ceee660 BH	352
47c3d19f SH	353	rc = qt202x_reset_phy(efx);
	354	if (rc) {
	355	EFX_ERR(efx, "PHY init failed\n");
	356	return rc;
	357	}
	358
47c3d19f	359	devid = efx_mdio_read_id(efx, MDIO_MMD_PHYXS);
3f39a5e9	360	EFX_INFO(efx, "PHY ID reg %x (OUI %06x model %02x revision %x)\n",
68e7f45e BH	361	devid, efx_mdio_id_oui(devid), efx_mdio_id_model(devid),
68e7f45e BH	362	efx_mdio_id_rev(devid));
8ceee660	363
0d83b2f6 MS	364	if (efx->phy_type == PHY_TYPE_QT2025C)
	365	qt2025c_firmware_id(efx);
	366
3273c2e8	367	return 0;
8ceee660 BH	368	}
8ceee660 BH	369
b37b62fe	370	static int qt202x_link_ok(struct efx_nic *efx)
8ceee660	371	{
b37b62fe	372	return efx_mdio_links_ok(efx, QT202X_REQUIRED_DEVS);
8ceee660 BH	373	}
8ceee660 BH	374
fdaa9aed	375	static bool qt202x_phy_poll(struct efx_nic *efx)
8ceee660	376	{
fdaa9aed SH	377	bool was_up = efx->link_state.up;
	378
	379	efx->link_state.up = qt202x_link_ok(efx);
	380	efx->link_state.speed = 10000;
	381	efx->link_state.fd = true;
	382	efx->link_state.fc = efx->wanted_fc;
	383
17d6aeaf MS	384	if (efx->phy_type == PHY_TYPE_QT2025C)
	385	qt2025c_bug17190_workaround(efx);
	386
fdaa9aed	387	return efx->link_state.up != was_up;
8ceee660 BH	388	}
8ceee660 BH	389
d3245b28	390	static int qt202x_phy_reconfigure(struct efx_nic *efx)
8ceee660	391	{
b37b62fe	392	struct qt202x_phy_data *phy_data = efx->phy_data;
3273c2e8	393
d2d2c373	394	if (efx->phy_type == PHY_TYPE_QT2025C) {
0d83b2f6 MS	395	int rc = qt2025c_select_phy_mode(efx);
	396	if (rc)
	397	return rc;
	398
d2d2c373 BH	399	/* There are several different register bits which can
	400	* disable TX (and save power) on direct-attach cables
	401	* or optical transceivers, varying somewhat between
	402	* firmware versions. Only 'static mode' appears to
	403	* cover everything. */
68e7f45e BH	404	mdio_set_flag(
	405	&efx->mdio, efx->mdio.prtad, MDIO_MMD_PMAPMD,
	406	PMA_PMD_FTX_CTRL2_REG, 1 << PMA_PMD_FTX_STATIC_LBN,
d2d2c373 BH	407	efx->phy_mode & PHY_MODE_TX_DISABLED \|\|
	408	efx->phy_mode & PHY_MODE_LOW_POWER \|\|
	409	efx->loopback_mode == LOOPBACK_PCS \|\|
	410	efx->loopback_mode == LOOPBACK_PMAPMD);
	411	} else {
	412	/* Reset the PHY when moving from tx off to tx on */
	413	if (!(efx->phy_mode & PHY_MODE_TX_DISABLED) &&
	414	(phy_data->phy_mode & PHY_MODE_TX_DISABLED))
b37b62fe	415	qt202x_reset_phy(efx);
d2d2c373	416
68e7f45e	417	efx_mdio_transmit_disable(efx);
d2d2c373	418	}
3273c2e8	419
68e7f45e	420	efx_mdio_phy_reconfigure(efx);
3273c2e8	421
f8b87c17	422	phy_data->phy_mode = efx->phy_mode;
d3245b28 BH	423
d3245b28 BH	424	return 0;
8ceee660 BH	425	}
8ceee660 BH	426
b37b62fe	427	static void qt202x_phy_get_settings(struct efx_nic efx, struct ethtool_cmd ecmd)
68e7f45e BH	428	{
	429	mdio45_ethtool_gset(&efx->mdio, ecmd);
	430	}
8ceee660	431
ff3b00a0	432	static void qt202x_phy_remove(struct efx_nic *efx)
8ceee660	433	{
3273c2e8 BH	434	/* Free the context block */
	435	kfree(efx->phy_data);
	436	efx->phy_data = NULL;
8ceee660 BH	437	}
8ceee660 BH	438
b37b62fe	439	struct efx_phy_operations falcon_qt202x_phy_ops = {
c1c4f453	440	.probe = qt202x_phy_probe,
b37b62fe BH	441	.init = qt202x_phy_init,
	442	.reconfigure = qt202x_phy_reconfigure,
	443	.poll = qt202x_phy_poll,
ff3b00a0 SH	444	.fini = efx_port_dummy_op_void,
ff3b00a0 SH	445	.remove = qt202x_phy_remove,
b37b62fe	446	.get_settings = qt202x_phy_get_settings,
68e7f45e	447	.set_settings = efx_mdio_set_settings,
8ceee660	448	};