Merge commit 'v2.6.27-rc1' into x86/urgent

[linux-2.6/x86.git] / drivers / net / sfc / tenxpress.c

/****************************************************************************
 * 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)


/* Self test (BIST) control register */
#define PMA_PMD_BIST_CTRL_REG   (0xc014)
#define PMA_PMD_BIST_BER_LBN    (2)     /* Run BER test */
#define PMA_PMD_BIST_CONT_LBN   (1)     /* Run continuous BIST until cleared */
#define PMA_PMD_BIST_SINGLE_LBN (0)     /* Run 1 BIST iteration (self clears) */
/* Self test status register */
#define PMA_PMD_BIST_STAT_REG   (0xc015)
#define PMA_PMD_BIST_ENX_LBN    (3)
#define PMA_PMD_BIST_PMA_LBN    (2)
#define PMA_PMD_BIST_RXD_LBN    (1)
#define PMA_PMD_BIST_AFE_LBN    (0)

/* Special Software reset register */
#define PMA_PMD_EXT_CTRL_REG 49152
#define PMA_PMD_EXT_SSR_LBN 15

#define BIST_MAX_DELAY  (1000)
#define BIST_POLL_DELAY (10)

/* 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 tenxpress_state state;
        enum efx_loopback_mode loopback_mode;
        atomic_t bad_crc_count;
        int tx_disabled;
        int bad_lp_tries;
};

static int tenxpress_state_is(struct efx_nic *efx, int state)
{
        struct tenxpress_phy_data *phy_data = efx->phy_data;
        return (phy_data != NULL) && (state == phy_data->state);
}

void tenxpress_set_state(struct efx_nic *efx,
                                enum tenxpress_state state)
{
        struct tenxpress_phy_data *phy_data = efx->phy_data;
        if (phy_data != NULL)
                phy_data->state = state;
}

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 void tenxpress_reset_xaui(struct efx_nic *efx);

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;

        tenxpress_set_state(efx, TENXPRESS_STATUS_NORMAL);

        if (!sfe4001_phy_flash_cfg) {
                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;

        EFX_TRACE(efx, "%s\n", __func__);

        /* 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);

        msleep(200);

        /* Wait for the blocks to come out of reset */
        rc = mdio_clause45_wait_reset_mmds(efx,
                                           TENXPRESS_REQUIRED_DEVS);
        if (rc < 0)
                return rc;

        /* Try and reconfigure the device */
        rc = tenxpress_init(efx);
        if (rc < 0)
                return rc;

        return 0;
}

static void tenxpress_set_bad_lp(struct efx_nic *efx, int 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 int tenxpress_link_ok(struct efx_nic *efx, int check_lp)
{
        int ok = mdio_clause45_links_ok(efx, TENXPRESS_REQUIRED_DEVS);

        if (ok) {
                tenxpress_set_bad_lp(efx, 0);
        } else if (check_lp) {
                /* Are we plugged into the wrong sort of link? */
                int bad_lp = 0;
                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, 0);
                        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;
        int loop_change = LOOPBACK_OUT_OF(phy_data, efx,
                                          TENXPRESS_LOOPBACKS);

        if (!tenxpress_state_is(efx, TENXPRESS_STATUS_NORMAL))
                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 ((phy_data->tx_disabled && !efx->tx_disabled) ||
            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->tx_disabled = efx->tx_disabled;
        phy_data->loopback_mode = efx->loopback_mode;
        efx->link_up = tenxpress_link_ok(efx, 0);
        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;
        int phy_up = tenxpress_state_is(efx, TENXPRESS_STATUS_NORMAL);
        int link_ok;

        link_ok = phy_up && tenxpress_link_ok(efx, 1);

        if (link_ok != efx->link_up)
                falcon_xmac_sim_phy_event(efx);

        /* Nothing to check if we've already shut down the PHY */
        if (!phy_up)
                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, int 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 void tenxpress_reset_xaui(struct efx_nic *efx)
{
        int phy = efx->mii.phy_id;
        int clk_ctrl, test_select, soft_rst2;

        /* Real work is done on clock_ctrl other resets are thought to be
         * optional but make the reset more reliable
         */

        /* Read */
        clk_ctrl = mdio_clause45_read(efx, phy, MDIO_MMD_PCS,
                                      PCS_CLOCK_CTRL_REG);
        test_select = mdio_clause45_read(efx, phy, MDIO_MMD_PCS,
                                         PCS_TEST_SELECT_REG);
        soft_rst2 = mdio_clause45_read(efx, phy, MDIO_MMD_PCS,
                                       PCS_SOFT_RST2_REG);

        /* Put in reset */
        test_select &= ~(1 << CLK312_EN_LBN);
        mdio_clause45_write(efx, phy, MDIO_MMD_PCS,
                            PCS_TEST_SELECT_REG, test_select);

        soft_rst2 &= ~((1 << XGXS_RST_N_LBN) | (1 << SERDES_RST_N_LBN));
        mdio_clause45_write(efx, phy, MDIO_MMD_PCS,
                            PCS_SOFT_RST2_REG, soft_rst2);

        clk_ctrl &= ~(1 << PLL312_RST_N_LBN);
        mdio_clause45_write(efx, phy, MDIO_MMD_PCS,
                            PCS_CLOCK_CTRL_REG, clk_ctrl);
        udelay(10);

        /* Remove reset */
        clk_ctrl |= (1 << PLL312_RST_N_LBN);
        mdio_clause45_write(efx, phy, MDIO_MMD_PCS,
                            PCS_CLOCK_CTRL_REG, clk_ctrl);
        udelay(10);

        soft_rst2 |= ((1 << XGXS_RST_N_LBN) | (1 << SERDES_RST_N_LBN));
        mdio_clause45_write(efx, phy, MDIO_MMD_PCS,
                            PCS_SOFT_RST2_REG, soft_rst2);
        udelay(10);

        test_select |= (1 << CLK312_EN_LBN);
        mdio_clause45_write(efx, phy, MDIO_MMD_PCS,
                            PCS_TEST_SELECT_REG, test_select);
        udelay(10);
}

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,
        .reset_xaui       = tenxpress_reset_xaui,
        .mmds             = TENXPRESS_REQUIRED_DEVS,
        .loopbacks        = TENXPRESS_LOOPBACKS,
};