1 files changed, 323 insertions, 0 deletions

diff --git a/drivers/net/sfc/mdio_10g.c b/drivers/net/sfc/mdio_10g.c
new file mode 100644
index 00000000000..7ab385c8136
--- /dev/null
+++ b/drivers/net/sfc/mdio_10g.c
@@ -0,0 +1,323 @@
+/****************************************************************************
+ * Driver for Solarflare Solarstorm 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.
+ */
+/*
+ * Useful functions for working with MDIO clause 45 PHYs
+ */
+#include <linux/types.h>
+#include <linux/ethtool.h>
+#include <linux/delay.h>
+#include "net_driver.h"
+#include "mdio_10g.h"
+#include "workarounds.h"
+
+unsigned efx_mdio_id_oui(u32 id)
+{
+        unsigned oui = 0;
+        int i;
+
+        /* The bits of the OUI are designated a..x, with a=0 and b variable.
+         * In the id register c is the MSB but the OUI is conventionally
+         * written as bytes h..a, p..i, x..q.  Reorder the bits accordingly. */
+        for (i = 0; i < 22; ++i)
+                if (id & (1 << (i + 10)))
+                        oui |= 1 << (i ^ 7);
+
+        return oui;
+}
+
+int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
+                            int spins, int spintime)
+{
+        u32 ctrl;
+
+        /* Catch callers passing values in the wrong units (or just silly) */
+        EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
+
+        efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
+        /* Wait for the reset bit to clear. */
+        do {
+                msleep(spintime);
+                ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
+                spins--;
+
+        } while (spins && (ctrl & MDIO_CTRL1_RESET));
+
+        return spins ? spins : -ETIMEDOUT;
+}
+
+static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd)
+{
+        int status;
+
+        if (mmd != MDIO_MMD_AN) {
+                /* Read MMD STATUS2 to check it is responding. */
+                status = efx_mdio_read(efx, mmd, MDIO_STAT2);
+                if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
+                        netif_err(efx, hw, efx->net_dev,
+                                  "PHY MMD %d not responding.\n", mmd);
+                        return -EIO;
+                }
+        }
+
+        return 0;
+}
+
+/* This ought to be ridiculous overkill. We expect it to fail rarely */
+#define MDIO45_RESET_TIME       1000 /* ms */
+#define MDIO45_RESET_ITERS      100
+
+int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
+{
+        const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
+        int tries = MDIO45_RESET_ITERS;
+        int rc = 0;
+        int in_reset;
+
+        while (tries) {
+                int mask = mmd_mask;
+                int mmd = 0;
+                int stat;
+                in_reset = 0;
+                while (mask) {
+                        if (mask & 1) {
+                                stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
+                                if (stat < 0) {
+                                        netif_err(efx, hw, efx->net_dev,
+                                                  "failed to read status of"
+                                                  " MMD %d\n", mmd);
+                                        return -EIO;
+                                }
+                                if (stat & MDIO_CTRL1_RESET)
+                                        in_reset |= (1 << mmd);
+                        }
+                        mask = mask >> 1;
+                        mmd++;
+                }
+                if (!in_reset)
+                        break;
+                tries--;
+                msleep(spintime);
+        }
+        if (in_reset != 0) {
+                netif_err(efx, hw, efx->net_dev,
+                          "not all MMDs came out of reset in time."
+                          " MMDs still in reset: %x\n", in_reset);
+                rc = -ETIMEDOUT;
+        }
+        return rc;
+}
+
+int efx_mdio_check_mmds(struct efx_nic *efx, unsigned int mmd_mask)
+{
+        int mmd = 0, probe_mmd, devs1, devs2;
+        u32 devices;
+
+        /* Historically we have probed the PHYXS to find out what devices are
+         * present,but that doesn't work so well if the PHYXS isn't expected
+         * to exist, if so just find the first item in the list supplied. */
+        probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
+            __ffs(mmd_mask);
+
+        /* Check all the expected MMDs are present */
+        devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
+        devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
+        if (devs1 < 0 || devs2 < 0) {
+                netif_err(efx, hw, efx->net_dev,
+                          "failed to read devices present\n");
+                return -EIO;
+        }
+        devices = devs1 | (devs2 << 16);
+        if ((devices & mmd_mask) != mmd_mask) {
+                netif_err(efx, hw, efx->net_dev,
+                          "required MMDs not present: got %x, wanted %x\n",
+                          devices, mmd_mask);
+                return -ENODEV;
+        }
+        netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
+
+        /* Check all required MMDs are responding and happy. */
+        while (mmd_mask) {
+                if ((mmd_mask & 1) && efx_mdio_check_mmd(efx, mmd))
+                        return -EIO;
+                mmd_mask = mmd_mask >> 1;
+                mmd++;
+        }
+
+        return 0;
+}
+
+bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
+{
+        /* If the port is in loopback, then we should only consider a subset
+         * of mmd's */
+        if (LOOPBACK_INTERNAL(efx))
+                return true;
+        else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
+                return false;
+        else if (efx_phy_mode_disabled(efx->phy_mode))
+                return false;
+        else if (efx->loopback_mode == LOOPBACK_PHYXS)
+                mmd_mask &= ~(MDIO_DEVS_PHYXS |
+                              MDIO_DEVS_PCS |
+                              MDIO_DEVS_PMAPMD |
+                              MDIO_DEVS_AN);
+        else if (efx->loopback_mode == LOOPBACK_PCS)
+                mmd_mask &= ~(MDIO_DEVS_PCS |
+                              MDIO_DEVS_PMAPMD |
+                              MDIO_DEVS_AN);
+        else if (efx->loopback_mode == LOOPBACK_PMAPMD)
+                mmd_mask &= ~(MDIO_DEVS_PMAPMD |
+                              MDIO_DEVS_AN);
+
+        return mdio45_links_ok(&efx->mdio, mmd_mask);
+}
+
+void efx_mdio_transmit_disable(struct efx_nic *efx)
+{
+        efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
+                          MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
+                          efx->phy_mode & PHY_MODE_TX_DISABLED);
+}
+
+void efx_mdio_phy_reconfigure(struct efx_nic *efx)
+{
+        efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
+                          MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
+                          efx->loopback_mode == LOOPBACK_PMAPMD);
+        efx_mdio_set_flag(efx, MDIO_MMD_PCS,
+                          MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
+                          efx->loopback_mode == LOOPBACK_PCS);
+        efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
+                          MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
+                          efx->loopback_mode == LOOPBACK_PHYXS_WS);
+}
+
+static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
+                                    int lpower, int mmd)
+{
+        int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
+
+        netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
+                  mmd, lpower);
+
+        if (stat & MDIO_STAT1_LPOWERABLE) {
+                efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
+                                  MDIO_CTRL1_LPOWER, lpower);
+        }
+}
+
+void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
+                              int low_power, unsigned int mmd_mask)
+{
+        int mmd = 0;
+        mmd_mask &= ~MDIO_DEVS_AN;
+        while (mmd_mask) {
+                if (mmd_mask & 1)
+                        efx_mdio_set_mmd_lpower(efx, low_power, mmd);
+                mmd_mask = (mmd_mask >> 1);
+                mmd++;
+        }
+}
+
+/**
+ * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
+ * @efx:                Efx NIC
+ * @ecmd:               New settings
+ */
+int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
+{
+        struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };
+
+        efx->phy_op->get_settings(efx, &prev);
+
+        if (ecmd->advertising == prev.advertising &&
+            ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
+            ecmd->duplex == prev.duplex &&
+            ecmd->port == prev.port &&
+            ecmd->autoneg == prev.autoneg)
+                return 0;
+
+        /* We can only change these settings for -T PHYs */
+        if (prev.port != PORT_TP || ecmd->port != PORT_TP)
+                return -EINVAL;
+
+        /* Check that PHY supports these settings */
+        if (!ecmd->autoneg ||
+            (ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
+                return -EINVAL;
+
+        efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
+        efx_mdio_an_reconfigure(efx);
+        return 0;
+}
+
+/**
+ * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
+ * @efx:                Efx NIC
+ */
+void efx_mdio_an_reconfigure(struct efx_nic *efx)
+{
+        int reg;
+
+        WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
+
+        /* Set up the base page */
+        reg = ADVERTISE_CSMA | ADVERTISE_RESV;
+        if (efx->link_advertising & ADVERTISED_Pause)
+                reg |= ADVERTISE_PAUSE_CAP;
+        if (efx->link_advertising & ADVERTISED_Asym_Pause)
+                reg |= ADVERTISE_PAUSE_ASYM;
+        efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
+
+        /* Set up the (extended) next page */
+        efx->phy_op->set_npage_adv(efx, efx->link_advertising);
+
+        /* Enable and restart AN */
+        reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
+        reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
+        efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
+}
+
+u8 efx_mdio_get_pause(struct efx_nic *efx)
+{
+        BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
+
+        if (!(efx->wanted_fc & EFX_FC_AUTO))
+                return efx->wanted_fc;
+
+        WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
+
+        return mii_resolve_flowctrl_fdx(
+                mii_advertise_flowctrl(efx->wanted_fc),
+                efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
+}
+
+int efx_mdio_test_alive(struct efx_nic *efx)
+{
+        int rc;
+        int devad = __ffs(efx->mdio.mmds);
+        u16 physid1, physid2;
+
+        mutex_lock(&efx->mac_lock);
+
+        physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
+        physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
+
+        if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
+            (physid2 == 0x0000) || (physid2 == 0xffff)) {
+                netif_err(efx, hw, efx->net_dev,
+                          "no MDIO PHY present with ID %d\n", efx->mdio.prtad);
+                rc = -EINVAL;
+        } else {
+                rc = efx_mdio_check_mmds(efx, efx->mdio.mmds);
+        }
+
+        mutex_unlock(&efx->mac_lock);
+        return rc;
+}