/****************************************************************************
* Driver for Solarflare 802.3an compliant PHY
* Copyright 2007 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.
*/
#include <linux/delay.h>
#include <linux/seq_file.h>
#include "efx.h"
#include "gmii.h"
#include "mdio_10g.h"
#include "falcon.h"
#include "phy.h"
#include "falcon_hwdefs.h"
#include "boards.h"
#include "mac.h"
/* We expect these MMDs to be in the package */
/* AN not here as mdio_check_mmds() requires STAT2 support */
#define TENXPRESS_REQUIRED_DEVS (MDIO_MMDREG_DEVS0_PMAPMD | \
MDIO_MMDREG_DEVS0_PCS | \
MDIO_MMDREG_DEVS0_PHYXS)
#define TENXPRESS_LOOPBACKS ((1 << LOOPBACK_PHYXS) | \
(1 << LOOPBACK_PCS) | \
(1 << LOOPBACK_PMAPMD) | \
(1 << LOOPBACK_NETWORK))
/* We complain if we fail to see the link partner as 10G capable this many
* times in a row (must be > 1 as sampling the autoneg. registers is racy)
*/
#define MAX_BAD_LP_TRIES (5)
/* Extended control register */
#define PMA_PMD_XCONTROL_REG 0xc000
#define PMA_PMD_LNPGA_POWERDOWN_LBN 8
#define PMA_PMD_LNPGA_POWERDOWN_WIDTH 1
/* extended status register */
#define PMA_PMD_XSTATUS_REG 0xc001
#define PMA_PMD_XSTAT_FLP_LBN (12)
/* LED control register */
#define PMA_PMD_LED_CTRL_REG (0xc007)
#define PMA_PMA_LED_ACTIVITY_LBN (3)
/* LED function override register */
#define PMA_PMD_LED_OVERR_REG (0xc009)
/* Bit positions for different LEDs (there are more but not wired on SFE4001)*/
#define PMA_PMD_LED_LINK_LBN (0)
#define PMA_PMD_LED_SPEED_LBN (2)
#define PMA_PMD_LED_TX_LBN (4)
#define PMA_PMD_LED_RX_LBN (6)
/* Override settings */
#define PMA_PMD_LED_AUTO (0) /* H/W control */
#define PMA_PMD_LED_ON (1)
#define PMA_PMD_LED_OFF (2)
#define PMA_PMD_LED_FLASH (3)
/* All LEDs under hardware control */
#define PMA_PMD_LED_FULL_AUTO (0)
/* Green and Amber under hardware control, Red off */
#define PMA_PMD_LED_DEFAULT (PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN)
/* Special Software reset register */
#define PMA_PMD_EXT_CTRL_REG 49152
#define PMA_PMD_EXT_SSR_LBN 15
/* Misc register defines */
#define PCS_CLOCK_CTRL_REG 0xd801
#define PLL312_RST_N_LBN 2
#define PCS_SOFT_RST2_REG 0xd806
#define SERDES_RST_N_LBN 13
#define XGXS_RST_N_LBN 12
#define PCS_TEST_SELECT_REG 0xd807 /* PRM 10.5.8 */
#define CLK312_EN_LBN 3
/* PHYXS registers */
#define PHYXS_TEST1 (49162)
#define LOOPBACK_NEAR_LBN (8)
#define LOOPBACK_NEAR_WIDTH (1)
/* Boot status register */
#define PCS_BOOT_STATUS_REG (0xd000)
#define PCS_BOOT_FATAL_ERR_LBN (0)
#define PCS_BOOT_PROGRESS_LBN (1)
#define PCS_BOOT_PROGRESS_WIDTH (2)
#define PCS_BOOT_COMPLETE_LBN (3)
#define PCS_BOOT_MAX_DELAY (100)
#define PCS_BOOT_POLL_DELAY (10)
/* Time to wait between powering down the LNPGA and turning off the power
* rails */
#define LNPGA_PDOWN_WAIT (HZ / 5)
static int crc_error_reset_threshold = 100;
module_param(crc_error_reset_threshold, int, 0644);
MODULE_PARM_DESC(crc_error_reset_threshold,
"Max number of CRC errors before XAUI reset");
struct tenxpress_phy_data {
enum efx_loopback_mode loopback_mode;
atomic_t bad_crc_count;
enum efx_phy_mode phy_mode;
int bad_lp_tries;
};
void tenxpress_crc_err(struct efx_nic *efx)
{
struct tenxpress_phy_data *phy_data = efx->phy_data;
if (phy_data != NULL)
atomic_inc(&phy_data->bad_crc_count);
}
/* Check that the C166 has booted successfully */
static int tenxpress_phy_check(struct efx_nic *efx)
{
int phy_id = efx->mii.phy_id;
int count = PCS_BOOT_MAX_DELAY / PCS_BOOT_POLL_DELAY;
int boot_stat;
/* Wait for the boot to complete (or not) */
while (count) {
boot_stat = mdio_clause45_read(efx, phy_id,
MDIO_MMD_PCS,
PCS_BOOT_STATUS_REG);
if (boot_stat & (1 << PCS_BOOT_COMPLETE_LBN))
break;
count--;
udelay(PCS_BOOT_POLL_DELAY);
}
if (!count) {
EFX_ERR(efx, "%s: PHY boot timed out. Last status "
"%x\n", __func__,
(boot_stat >> PCS_BOOT_PROGRESS_LBN) &
((1 << PCS_BOOT_PROGRESS_WIDTH) - 1));
return -ETIMEDOUT;
}
return 0;
}
static int tenxpress_init(struct efx_nic *efx)
{
int rc, reg;
/* Turn on the clock */
reg = (1 << CLK312_EN_LBN);
mdio_clause45_write(efx, efx->mii.phy_id,
MDIO_MMD_PCS, PCS_TEST_SELECT_REG, reg);
rc = tenxpress_phy_check(efx);
if (rc < 0)
return rc;
/* Set the LEDs up as: Green = Link, Amber = Link/Act, Red = Off */
reg = mdio_clause45_read(efx, efx->mii.phy_id,
MDIO_MMD_PMAPMD, PMA_PMD_LED_CTRL_REG);
reg |= (1 << PMA_PMA_LED_ACTIVITY_LBN);
mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_LED_CTRL_REG, reg);
reg = PMA_PMD_LED_DEFAULT;
mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_LED_OVERR_REG, reg);
return rc;
}
static int tenxpress_phy_init(struct efx_nic *efx)
{
struct tenxpress_phy_data *phy_data;
int rc = 0;
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;
rc = mdio_clause45_wait_reset_mmds(efx,
TENXPRESS_REQUIRED_DEVS);
if (rc < 0)
goto fail;
rc = mdio_clause45_check_mmds(efx, TENXPRESS_REQUIRED_DEVS, 0);
if (rc < 0)
goto fail;
rc = tenxpress_init(efx);
if (rc < 0)
goto fail;
schedule_timeout_uninterruptible(HZ / 5); /* 200ms */
/* Let XGXS and SerDes out of reset and resets 10XPress */
falcon_reset_xaui(efx);
return 0;
fail:
kfree(efx->phy_data);
efx->phy_data = NULL;
return rc;
}
static int tenxpress_special_reset(struct efx_nic *efx)
{
int rc, reg;
/* The XGMAC clock is driven from the SFC7101/SFT9001 312MHz clock, so
* a special software reset can glitch the XGMAC sufficiently for stats
* requests to fail. Since we don't ofen special_reset, just lock. */
spin_lock(&efx->stats_lock);
/* Initiate reset */
reg = mdio_clause45_read(efx, efx->mii.phy_id,
MDIO_MMD_PMAPMD, PMA_PMD_EXT_CTRL_REG);
reg |= (1 << PMA_PMD_EXT_SSR_LBN);
mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_EXT_CTRL_REG, reg);
mdelay(200);
/* Wait for the blocks to come out of reset */
rc = mdio_clause45_wait_reset_mmds(efx,
TENXPRESS_REQUIRED_DEVS);
if (rc < 0)
goto unlock;
/* Try and reconfigure the device */
rc = tenxpress_init(efx);
if (rc < 0)
goto unlock;
unlock:
spin_unlock(&efx->stats_lock);
return rc;
}
static void tenxpress_set_bad_lp(struct efx_nic *efx, bool bad_lp)
{
struct tenxpress_phy_data *pd = efx->phy_data;
int reg;
/* Nothing to do if all is well and was previously so. */
if (!(bad_lp || pd->bad_lp_tries))
return;
reg = mdio_clause45_read(efx, efx->mii.phy_id,
MDIO_MMD_PMAPMD, PMA_PMD_LED_OVERR_REG);
if (bad_lp)
pd->bad_lp_tries++;
else
pd->bad_lp_tries = 0;
if (pd->bad_lp_tries == MAX_BAD_LP_TRIES) {
pd->bad_lp_tries = 0; /* Restart count */
reg &= ~(PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN);
reg |= (PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN);
EFX_ERR(efx, "This NIC appears to be plugged into"
" a port that is not 10GBASE-T capable.\n"
" This PHY is 10GBASE-T ONLY, so no link can"
" be established.\n");
} else {
reg |= (PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN);
}
mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_LED_OVERR_REG, reg);
}
/* Check link status and return a boolean OK value. If the link is NOT
* OK we have a quick rummage round to see if we appear to be plugged
* into a non-10GBT port and if so warn the user that they won't get
* link any time soon as we are 10GBT only, unless caller specified
* not to do this check (it isn't useful in loopback) */
static bool tenxpress_link_ok(struct efx_nic *efx, bool check_lp)
{
bool ok = mdio_clause45_links_ok(efx, TENXPRESS_REQUIRED_DEVS);
if (ok) {
tenxpress_set_bad_lp(efx, false);
} else if (check_lp) {
/* Are we plugged into the wrong sort of link? */
bool bad_lp = false;
int phy_id = efx->mii.phy_id;
int an_stat = mdio_clause45_read(efx, phy_id, MDIO_MMD_AN,
MDIO_AN_STATUS);
int xphy_stat = mdio_clause45_read(efx, phy_id,
MDIO_MMD_PMAPMD,
PMA_PMD_XSTATUS_REG);
/* Are we plugged into anything that sends FLPs? If
* not we can't distinguish between not being plugged
* in and being plugged into a non-AN antique. The FLP
* bit has the advantage of not clearing when autoneg
* restarts. */
if (!(xphy_stat & (1 << PMA_PMD_XSTAT_FLP_LBN))) {
tenxpress_set_bad_lp(efx, false);
return ok;
}
/* If it can do 10GBT it must be XNP capable */
bad_lp = !(an_stat & (1 << MDIO_AN_STATUS_XNP_LBN));
if (!bad_lp && (an_stat & (1 << MDIO_AN_STATUS_PAGE_LBN))) {
bad_lp = !(mdio_clause45_read(efx, phy_id,
MDIO_MMD_AN, MDIO_AN_10GBT_STATUS) &
(1 << MDIO_AN_10GBT_STATUS_LP_10G_LBN));
}
tenxpress_set_bad_lp(efx, bad_lp);
}
return ok;
}
static void tenxpress_phyxs_loopback(struct efx_nic *efx)
{
int phy_id = efx->mii.phy_id;
int ctrl1, ctrl2;
ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PHYXS,
PHYXS_TEST1);
if (efx->loopback_mode == LOOPBACK_PHYXS)
ctrl2 |= (1 << LOOPBACK_NEAR_LBN);
else
ctrl2 &= ~(1 << LOOPBACK_NEAR_LBN);
if (ctrl1 != ctrl2)
mdio_clause45_write(efx, phy_id, MDIO_MMD_PHYXS,
PHYXS_TEST1, ctrl2);
}
static void tenxpress_phy_reconfigure(struct efx_nic *efx)
{
struct tenxpress_phy_data *phy_data = efx->phy_data;
bool loop_change = LOOPBACK_OUT_OF(phy_data, efx,
TENXPRESS_LOOPBACKS);
if (efx->phy_mode & PHY_MODE_SPECIAL) {
phy_data->phy_mode = efx->phy_mode;
return;
}
/* When coming out of transmit disable, coming out of low power
* mode, or moving out of any PHY internal loopback mode,
* perform a special software reset */
if ((efx->phy_mode == PHY_MODE_NORMAL &&
phy_data->phy_mode != PHY_MODE_NORMAL) ||
loop_change) {
tenxpress_special_reset(efx);
falcon_reset_xaui(efx);
}
mdio_clause45_transmit_disable(efx);
mdio_clause45_phy_reconfigure(efx);
tenxpress_phyxs_loopback(efx);
phy_data->loopback_mode = efx->loopback_mode;
phy_data->phy_mode = efx->phy_mode;
efx->link_up = tenxpress_link_ok(efx, false);
efx->link_options = GM_LPA_10000FULL;
}
static void tenxpress_phy_clear_interrupt(struct efx_nic *efx)
{
/* Nothing done here - LASI interrupts aren't reliable so poll */
}
/* Poll PHY for interrupt */
static int tenxpress_phy_check_hw(struct efx_nic *efx)
{
struct tenxpress_phy_data *phy_data = efx->phy_data;
bool link_ok;
link_ok = tenxpress_link_ok(efx, true);
if (link_ok != efx->link_up)
falcon_xmac_sim_phy_event(efx);
if (phy_data->phy_mode != PHY_MODE_NORMAL)
return 0;
if (atomic_read(&phy_data->bad_crc_count) > crc_error_reset_threshold) {
EFX_ERR(efx, "Resetting XAUI due to too many CRC errors\n");
falcon_reset_xaui(efx);
atomic_set(&phy_data->bad_crc_count, 0);
}
return 0;
}
static void tenxpress_phy_fini(struct efx_nic *efx)
{
int reg;
/* Power down the LNPGA */
reg = (1 << PMA_PMD_LNPGA_POWERDOWN_LBN);
mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_XCONTROL_REG, reg);
/* Waiting here ensures that the board fini, which can turn off the
* power to the PHY, won't get run until the LNPGA powerdown has been
* given long enough to complete. */
schedule_timeout_uninterruptible(LNPGA_PDOWN_WAIT); /* 200 ms */
kfree(efx->phy_data);
efx->phy_data = NULL;
}
/* Set the RX and TX LEDs and Link LED flashing. The other LEDs
* (which probably aren't wired anyway) are left in AUTO mode */
void tenxpress_phy_blink(struct efx_nic *efx, bool blink)
{
int reg;
if (blink)
reg = (PMA_PMD_LED_FLASH << PMA_PMD_LED_TX_LBN) |
(PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN) |
(PMA_PMD_LED_FLASH << PMA_PMD_LED_LINK_LBN);
else
reg = PMA_PMD_LED_DEFAULT;
mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_LED_OVERR_REG, reg);
}
static int tenxpress_phy_test(struct efx_nic *efx)
{
/* BIST is automatically run after a special software reset */
return tenxpress_special_reset(efx);
}
struct efx_phy_operations falcon_tenxpress_phy_ops = {
.init = tenxpress_phy_init,
.reconfigure = tenxpress_phy_reconfigure,
.check_hw = tenxpress_phy_check_hw,
.fini = tenxpress_phy_fini,
.clear_interrupt = tenxpress_phy_clear_interrupt,
.test = tenxpress_phy_test,
.mmds = TENXPRESS_REQUIRED_DEVS,
.loopbacks = TENXPRESS_LOOPBACKS,
};
