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linux/drivers/net/ethernet/sfc/txc43128_phy.c

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/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2006-2011 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 Transwitch/Mysticom CX4 retimer
* see www.transwitch.com, part is TXC-43128
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include "efx.h"
#include "mdio_10g.h"
#include "phy.h"
#include "nic.h"
/* We expect these MMDs to be in the package */
#define TXC_REQUIRED_DEVS (MDIO_DEVS_PCS | \
MDIO_DEVS_PMAPMD | \
MDIO_DEVS_PHYXS)
#define TXC_LOOPBACKS ((1 << LOOPBACK_PCS) | \
(1 << LOOPBACK_PMAPMD) | \
(1 << LOOPBACK_PHYXS_WS))
/**************************************************************************
*
* Compile-time config
*
**************************************************************************
*/
#define TXCNAME "TXC43128"
/* Total length of time we'll wait for the PHY to come out of reset (ms) */
#define TXC_MAX_RESET_TIME 500
/* Interval between checks (ms) */
#define TXC_RESET_WAIT 10
/* How long to run BIST (us) */
#define TXC_BIST_DURATION 50
/**************************************************************************
*
* Register definitions
*
**************************************************************************
*/
/* Command register */
#define TXC_GLRGS_GLCMD 0xc004
/* Useful bits in command register */
/* Lane power-down */
#define TXC_GLCMD_L01PD_LBN 5
#define TXC_GLCMD_L23PD_LBN 6
/* Limited SW reset: preserves configuration but
* initiates a logic reset. Self-clearing */
#define TXC_GLCMD_LMTSWRST_LBN 14
/* Signal Quality Control */
#define TXC_GLRGS_GSGQLCTL 0xc01a
/* Enable bit */
#define TXC_GSGQLCT_SGQLEN_LBN 15
/* Lane selection */
#define TXC_GSGQLCT_LNSL_LBN 13
#define TXC_GSGQLCT_LNSL_WIDTH 2
/* Analog TX control */
#define TXC_ALRGS_ATXCTL 0xc040
/* Lane power-down */
#define TXC_ATXCTL_TXPD3_LBN 15
#define TXC_ATXCTL_TXPD2_LBN 14
#define TXC_ATXCTL_TXPD1_LBN 13
#define TXC_ATXCTL_TXPD0_LBN 12
/* Amplitude on lanes 0, 1 */
#define TXC_ALRGS_ATXAMP0 0xc041
/* Amplitude on lanes 2, 3 */
#define TXC_ALRGS_ATXAMP1 0xc042
/* Bit position of value for lane 0 (or 2) */
#define TXC_ATXAMP_LANE02_LBN 3
/* Bit position of value for lane 1 (or 3) */
#define TXC_ATXAMP_LANE13_LBN 11
#define TXC_ATXAMP_1280_mV 0
#define TXC_ATXAMP_1200_mV 8
#define TXC_ATXAMP_1120_mV 12
#define TXC_ATXAMP_1060_mV 14
#define TXC_ATXAMP_0820_mV 25
#define TXC_ATXAMP_0720_mV 26
#define TXC_ATXAMP_0580_mV 27
#define TXC_ATXAMP_0440_mV 28
#define TXC_ATXAMP_0820_BOTH \
((TXC_ATXAMP_0820_mV << TXC_ATXAMP_LANE02_LBN) \
| (TXC_ATXAMP_0820_mV << TXC_ATXAMP_LANE13_LBN))
#define TXC_ATXAMP_DEFAULT 0x6060 /* From databook */
/* Preemphasis on lanes 0, 1 */
#define TXC_ALRGS_ATXPRE0 0xc043
/* Preemphasis on lanes 2, 3 */
#define TXC_ALRGS_ATXPRE1 0xc044
#define TXC_ATXPRE_NONE 0
#define TXC_ATXPRE_DEFAULT 0x1010 /* From databook */
#define TXC_ALRGS_ARXCTL 0xc045
/* Lane power-down */
#define TXC_ARXCTL_RXPD3_LBN 15
#define TXC_ARXCTL_RXPD2_LBN 14
#define TXC_ARXCTL_RXPD1_LBN 13
#define TXC_ARXCTL_RXPD0_LBN 12
/* Main control */
#define TXC_MRGS_CTL 0xc340
/* Bits in main control */
#define TXC_MCTL_RESET_LBN 15 /* Self clear */
#define TXC_MCTL_TXLED_LBN 14 /* 1 to show align status */
#define TXC_MCTL_RXLED_LBN 13 /* 1 to show align status */
/* GPIO output */
#define TXC_GPIO_OUTPUT 0xc346
#define TXC_GPIO_DIR 0xc348
/* Vendor-specific BIST registers */
#define TXC_BIST_CTL 0xc280
#define TXC_BIST_TXFRMCNT 0xc281
#define TXC_BIST_RX0FRMCNT 0xc282
#define TXC_BIST_RX1FRMCNT 0xc283
#define TXC_BIST_RX2FRMCNT 0xc284
#define TXC_BIST_RX3FRMCNT 0xc285
#define TXC_BIST_RX0ERRCNT 0xc286
#define TXC_BIST_RX1ERRCNT 0xc287
#define TXC_BIST_RX2ERRCNT 0xc288
#define TXC_BIST_RX3ERRCNT 0xc289
/* BIST type (controls bit patter in test) */
#define TXC_BIST_CTRL_TYPE_LBN 10
#define TXC_BIST_CTRL_TYPE_TSD 0 /* TranSwitch Deterministic */
#define TXC_BIST_CTRL_TYPE_CRP 1 /* CRPAT standard */
#define TXC_BIST_CTRL_TYPE_CJP 2 /* CJPAT standard */
#define TXC_BIST_CTRL_TYPE_TSR 3 /* TranSwitch pseudo-random */
/* Set this to 1 for 10 bit and 0 for 8 bit */
#define TXC_BIST_CTRL_B10EN_LBN 12
/* Enable BIST (write 0 to disable) */
#define TXC_BIST_CTRL_ENAB_LBN 13
/* Stop BIST (self-clears when stop complete) */
#define TXC_BIST_CTRL_STOP_LBN 14
/* Start BIST (cleared by writing 1 to STOP) */
#define TXC_BIST_CTRL_STRT_LBN 15
/* Mt. Diablo test configuration */
#define TXC_MTDIABLO_CTRL 0xc34f
#define TXC_MTDIABLO_CTRL_PMA_LOOP_LBN 10
struct txc43128_data {
unsigned long bug10934_timer;
enum efx_phy_mode phy_mode;
enum efx_loopback_mode loopback_mode;
};
/* The PHY sometimes needs a reset to bring the link back up. So long as
* it reports link down, we reset it every 5 seconds.
*/
#define BUG10934_RESET_INTERVAL (5 * HZ)
/* Perform a reset that doesn't clear configuration changes */
static void txc_reset_logic(struct efx_nic *efx);
/* Set the output value of a gpio */
void falcon_txc_set_gpio_val(struct efx_nic *efx, int pin, int on)
{
efx_mdio_set_flag(efx, MDIO_MMD_PHYXS, TXC_GPIO_OUTPUT, 1 << pin, on);
}
/* Set up the GPIO direction register */
void falcon_txc_set_gpio_dir(struct efx_nic *efx, int pin, int dir)
{
efx_mdio_set_flag(efx, MDIO_MMD_PHYXS, TXC_GPIO_DIR, 1 << pin, dir);
}
/* Reset the PMA/PMD MMD. The documentation is explicit that this does a
* global reset (it's less clear what reset of other MMDs does).*/
static int txc_reset_phy(struct efx_nic *efx)
{
int rc = efx_mdio_reset_mmd(efx, MDIO_MMD_PMAPMD,
TXC_MAX_RESET_TIME / TXC_RESET_WAIT,
TXC_RESET_WAIT);
if (rc < 0)
goto fail;
/* Check that all the MMDs we expect are present and responding. */
rc = efx_mdio_check_mmds(efx, TXC_REQUIRED_DEVS);
if (rc < 0)
goto fail;
return 0;
fail:
netif_err(efx, hw, efx->net_dev, TXCNAME ": reset timed out!\n");
return rc;
}
/* Run a single BIST on one MMD */
static int txc_bist_one(struct efx_nic *efx, int mmd, int test)
{
int ctrl, bctl;
int lane;
int rc = 0;
/* Set PMA to test into loopback using Mt Diablo reg as per app note */
ctrl = efx_mdio_read(efx, MDIO_MMD_PCS, TXC_MTDIABLO_CTRL);
ctrl |= (1 << TXC_MTDIABLO_CTRL_PMA_LOOP_LBN);
efx_mdio_write(efx, MDIO_MMD_PCS, TXC_MTDIABLO_CTRL, ctrl);
/* The BIST app. note lists these as 3 distinct steps. */
/* Set the BIST type */
bctl = (test << TXC_BIST_CTRL_TYPE_LBN);
efx_mdio_write(efx, mmd, TXC_BIST_CTL, bctl);
/* Set the BSTEN bit in the BIST Control register to enable */
bctl |= (1 << TXC_BIST_CTRL_ENAB_LBN);
efx_mdio_write(efx, mmd, TXC_BIST_CTL, bctl);
/* Set the BSTRT bit in the BIST Control register */
efx_mdio_write(efx, mmd, TXC_BIST_CTL,
bctl | (1 << TXC_BIST_CTRL_STRT_LBN));
/* Wait. */
udelay(TXC_BIST_DURATION);
/* Set the BSTOP bit in the BIST Control register */
bctl |= (1 << TXC_BIST_CTRL_STOP_LBN);
efx_mdio_write(efx, mmd, TXC_BIST_CTL, bctl);
/* The STOP bit should go off when things have stopped */
while (bctl & (1 << TXC_BIST_CTRL_STOP_LBN))
bctl = efx_mdio_read(efx, mmd, TXC_BIST_CTL);
/* Check all the error counts are 0 and all the frame counts are
non-zero */
for (lane = 0; lane < 4; lane++) {
int count = efx_mdio_read(efx, mmd, TXC_BIST_RX0ERRCNT + lane);
if (count != 0) {
netif_err(efx, hw, efx->net_dev, TXCNAME": BIST error. "
"Lane %d had %d errs\n", lane, count);
rc = -EIO;
}
count = efx_mdio_read(efx, mmd, TXC_BIST_RX0FRMCNT + lane);
if (count == 0) {
netif_err(efx, hw, efx->net_dev, TXCNAME": BIST error. "
"Lane %d got 0 frames\n", lane);
rc = -EIO;
}
}
if (rc == 0)
netif_info(efx, hw, efx->net_dev, TXCNAME": BIST pass\n");
/* Disable BIST */
efx_mdio_write(efx, mmd, TXC_BIST_CTL, 0);
/* Turn off loopback */
ctrl &= ~(1 << TXC_MTDIABLO_CTRL_PMA_LOOP_LBN);
efx_mdio_write(efx, MDIO_MMD_PCS, TXC_MTDIABLO_CTRL, ctrl);
return rc;
}
static int txc_bist(struct efx_nic *efx)
{
return txc_bist_one(efx, MDIO_MMD_PCS, TXC_BIST_CTRL_TYPE_TSD);
}
/* Push the non-configurable defaults into the PHY. This must be
* done after every full reset */
static void txc_apply_defaults(struct efx_nic *efx)
{
int mctrl;
/* Turn amplitude down and preemphasis off on the host side
* (PHY<->MAC) as this is believed less likely to upset Falcon
* and no adverse effects have been noted. It probably also
* saves a picowatt or two */
/* Turn off preemphasis */
efx_mdio_write(efx, MDIO_MMD_PHYXS, TXC_ALRGS_ATXPRE0, TXC_ATXPRE_NONE);
efx_mdio_write(efx, MDIO_MMD_PHYXS, TXC_ALRGS_ATXPRE1, TXC_ATXPRE_NONE);
/* Turn down the amplitude */
efx_mdio_write(efx, MDIO_MMD_PHYXS,
TXC_ALRGS_ATXAMP0, TXC_ATXAMP_0820_BOTH);
efx_mdio_write(efx, MDIO_MMD_PHYXS,
TXC_ALRGS_ATXAMP1, TXC_ATXAMP_0820_BOTH);
/* Set the line side amplitude and preemphasis to the databook
* defaults as an erratum causes them to be 0 on at least some
* PHY rev.s */
efx_mdio_write(efx, MDIO_MMD_PMAPMD,
TXC_ALRGS_ATXPRE0, TXC_ATXPRE_DEFAULT);
efx_mdio_write(efx, MDIO_MMD_PMAPMD,
TXC_ALRGS_ATXPRE1, TXC_ATXPRE_DEFAULT);
efx_mdio_write(efx, MDIO_MMD_PMAPMD,
TXC_ALRGS_ATXAMP0, TXC_ATXAMP_DEFAULT);
efx_mdio_write(efx, MDIO_MMD_PMAPMD,
TXC_ALRGS_ATXAMP1, TXC_ATXAMP_DEFAULT);
/* Set up the LEDs */
mctrl = efx_mdio_read(efx, MDIO_MMD_PHYXS, TXC_MRGS_CTL);
/* Set the Green and Red LEDs to their default modes */
mctrl &= ~((1 << TXC_MCTL_TXLED_LBN) | (1 << TXC_MCTL_RXLED_LBN));
efx_mdio_write(efx, MDIO_MMD_PHYXS, TXC_MRGS_CTL, mctrl);
/* Databook recommends doing this after configuration changes */
txc_reset_logic(efx);
falcon_board(efx)->type->init_phy(efx);
}
static int txc43128_phy_probe(struct efx_nic *efx)
{
struct txc43128_data *phy_data;
/* Allocate phy private storage */
phy_data = kzalloc(sizeof(*phy_data), GFP_KERNEL);
if (!phy_data)
return -ENOMEM;
efx->phy_data = phy_data;
phy_data->phy_mode = efx->phy_mode;
efx->mdio.mmds = TXC_REQUIRED_DEVS;
efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
efx->loopback_modes = TXC_LOOPBACKS | FALCON_XMAC_LOOPBACKS;
return 0;
}
/* Initialisation entry point for this PHY driver */
static int txc43128_phy_init(struct efx_nic *efx)
{
int rc;
rc = txc_reset_phy(efx);
if (rc < 0)
return rc;
rc = txc_bist(efx);
if (rc < 0)
return rc;
txc_apply_defaults(efx);
return 0;
}
/* Set the lane power down state in the global registers */
static void txc_glrgs_lane_power(struct efx_nic *efx, int mmd)
{
int pd = (1 << TXC_GLCMD_L01PD_LBN) | (1 << TXC_GLCMD_L23PD_LBN);
int ctl = efx_mdio_read(efx, mmd, TXC_GLRGS_GLCMD);
if (!(efx->phy_mode & PHY_MODE_LOW_POWER))
ctl &= ~pd;
else
ctl |= pd;
efx_mdio_write(efx, mmd, TXC_GLRGS_GLCMD, ctl);
}
/* Set the lane power down state in the analog control registers */
static void txc_analog_lane_power(struct efx_nic *efx, int mmd)
{
int txpd = (1 << TXC_ATXCTL_TXPD3_LBN) | (1 << TXC_ATXCTL_TXPD2_LBN)
| (1 << TXC_ATXCTL_TXPD1_LBN) | (1 << TXC_ATXCTL_TXPD0_LBN);
int rxpd = (1 << TXC_ARXCTL_RXPD3_LBN) | (1 << TXC_ARXCTL_RXPD2_LBN)
| (1 << TXC_ARXCTL_RXPD1_LBN) | (1 << TXC_ARXCTL_RXPD0_LBN);
int txctl = efx_mdio_read(efx, mmd, TXC_ALRGS_ATXCTL);
int rxctl = efx_mdio_read(efx, mmd, TXC_ALRGS_ARXCTL);
if (!(efx->phy_mode & PHY_MODE_LOW_POWER)) {
txctl &= ~txpd;
rxctl &= ~rxpd;
} else {
txctl |= txpd;
rxctl |= rxpd;
}
efx_mdio_write(efx, mmd, TXC_ALRGS_ATXCTL, txctl);
efx_mdio_write(efx, mmd, TXC_ALRGS_ARXCTL, rxctl);
}
static void txc_set_power(struct efx_nic *efx)
{
/* According to the data book, all the MMDs can do low power */
efx_mdio_set_mmds_lpower(efx,
!!(efx->phy_mode & PHY_MODE_LOW_POWER),
TXC_REQUIRED_DEVS);
/* Global register bank is in PCS, PHY XS. These control the host
* side and line side settings respectively. */
txc_glrgs_lane_power(efx, MDIO_MMD_PCS);
txc_glrgs_lane_power(efx, MDIO_MMD_PHYXS);
/* Analog register bank in PMA/PMD, PHY XS */
txc_analog_lane_power(efx, MDIO_MMD_PMAPMD);
txc_analog_lane_power(efx, MDIO_MMD_PHYXS);
}
static void txc_reset_logic_mmd(struct efx_nic *efx, int mmd)
{
int val = efx_mdio_read(efx, mmd, TXC_GLRGS_GLCMD);
int tries = 50;
val |= (1 << TXC_GLCMD_LMTSWRST_LBN);
efx_mdio_write(efx, mmd, TXC_GLRGS_GLCMD, val);
while (tries--) {
val = efx_mdio_read(efx, mmd, TXC_GLRGS_GLCMD);
if (!(val & (1 << TXC_GLCMD_LMTSWRST_LBN)))
break;
udelay(1);
}
if (!tries)
netif_info(efx, hw, efx->net_dev,
TXCNAME " Logic reset timed out!\n");
}
/* Perform a logic reset. This preserves the configuration registers
* and is needed for some configuration changes to take effect */
static void txc_reset_logic(struct efx_nic *efx)
{
/* The data sheet claims we can do the logic reset on either the
* PCS or the PHYXS and the result is a reset of both host- and
* line-side logic. */
txc_reset_logic_mmd(efx, MDIO_MMD_PCS);
}
static bool txc43128_phy_read_link(struct efx_nic *efx)
{
return efx_mdio_links_ok(efx, TXC_REQUIRED_DEVS);
}
static int txc43128_phy_reconfigure(struct efx_nic *efx)
{
struct txc43128_data *phy_data = efx->phy_data;
enum efx_phy_mode mode_change = efx->phy_mode ^ phy_data->phy_mode;
bool loop_change = LOOPBACK_CHANGED(phy_data, efx, TXC_LOOPBACKS);
if (efx->phy_mode & mode_change & PHY_MODE_TX_DISABLED) {
txc_reset_phy(efx);
txc_apply_defaults(efx);
falcon_reset_xaui(efx);
mode_change &= ~PHY_MODE_TX_DISABLED;
}
efx_mdio_transmit_disable(efx);
efx_mdio_phy_reconfigure(efx);
if (mode_change & PHY_MODE_LOW_POWER)
txc_set_power(efx);
/* The data sheet claims this is required after every reconfiguration
* (note at end of 7.1), but we mustn't do it when nothing changes as
* it glitches the link, and reconfigure gets called on link change,
* so we get an IRQ storm on link up. */
if (loop_change || mode_change)
txc_reset_logic(efx);
phy_data->phy_mode = efx->phy_mode;
phy_data->loopback_mode = efx->loopback_mode;
return 0;
}
static void txc43128_phy_fini(struct efx_nic *efx)
{
/* Disable link events */
efx_mdio_write(efx, MDIO_MMD_PMAPMD, MDIO_PMA_LASI_CTRL, 0);
}
static void txc43128_phy_remove(struct efx_nic *efx)
{
kfree(efx->phy_data);
efx->phy_data = NULL;
}
/* Periodic callback: this exists mainly to poll link status as we
* don't use LASI interrupts */
static bool txc43128_phy_poll(struct efx_nic *efx)
{
struct txc43128_data *data = efx->phy_data;
bool was_up = efx->link_state.up;
efx->link_state.up = txc43128_phy_read_link(efx);
efx->link_state.speed = 10000;
efx->link_state.fd = true;
efx->link_state.fc = efx->wanted_fc;
if (efx->link_state.up || (efx->loopback_mode != LOOPBACK_NONE)) {
data->bug10934_timer = jiffies;
} else {
if (time_after_eq(jiffies, (data->bug10934_timer +
BUG10934_RESET_INTERVAL))) {
data->bug10934_timer = jiffies;
txc_reset_logic(efx);
}
}
return efx->link_state.up != was_up;
}
static const char *const txc43128_test_names[] = {
"bist"
};
static const char *txc43128_test_name(struct efx_nic *efx, unsigned int index)
{
if (index < ARRAY_SIZE(txc43128_test_names))
return txc43128_test_names[index];
return NULL;
}
static int txc43128_run_tests(struct efx_nic *efx, int *results, unsigned flags)
{
int rc;
if (!(flags & ETH_TEST_FL_OFFLINE))
return 0;
rc = txc_reset_phy(efx);
if (rc < 0)
return rc;
rc = txc_bist(efx);
txc_apply_defaults(efx);
results[0] = rc ? -1 : 1;
return rc;
}
static void txc43128_get_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
{
mdio45_ethtool_gset(&efx->mdio, ecmd);
}
const struct efx_phy_operations falcon_txc_phy_ops = {
.probe = txc43128_phy_probe,
.init = txc43128_phy_init,
.reconfigure = txc43128_phy_reconfigure,
.poll = txc43128_phy_poll,
.fini = txc43128_phy_fini,
.remove = txc43128_phy_remove,
.get_settings = txc43128_get_settings,
.set_settings = efx_mdio_set_settings,
.test_alive = efx_mdio_test_alive,
.run_tests = txc43128_run_tests,
.test_name = txc43128_test_name,
};
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