| /**************************************************************************** |
| * Driver for Solarflare Solarstorm network controllers and boards |
| * Copyright 2006-2008 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 fault_fatal) |
| { |
| int status; |
| |
| if (LOOPBACK_INTERNAL(efx)) |
| return 0; |
| |
| 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) { |
| EFX_ERR(efx, "PHY MMD %d not responding.\n", mmd); |
| return -EIO; |
| } |
| } |
| |
| /* Read MMD STATUS 1 to check for fault. */ |
| status = efx_mdio_read(efx, mmd, MDIO_STAT1); |
| if (status & MDIO_STAT1_FAULT) { |
| if (fault_fatal) { |
| EFX_ERR(efx, "PHY MMD %d reporting fatal" |
| " fault: status %x\n", mmd, status); |
| return -EIO; |
| } else { |
| EFX_LOG(efx, "PHY MMD %d reporting status" |
| " %x (expected)\n", mmd, status); |
| } |
| } |
| 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) { |
| EFX_ERR(efx, "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) { |
| EFX_ERR(efx, "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, unsigned int fatal_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) { |
| EFX_ERR(efx, "failed to read devices present\n"); |
| return -EIO; |
| } |
| devices = devs1 | (devs2 << 16); |
| if ((devices & mmd_mask) != mmd_mask) { |
| EFX_ERR(efx, "required MMDs not present: got %x, " |
| "wanted %x\n", devices, mmd_mask); |
| return -ENODEV; |
| } |
| EFX_TRACE(efx, "Devices present: %x\n", devices); |
| |
| /* Check all required MMDs are responding and happy. */ |
| while (mmd_mask) { |
| if (mmd_mask & 1) { |
| int fault_fatal = fatal_mask & 1; |
| if (efx_mdio_check_mmd(efx, mmd, fault_fatal)) |
| return -EIO; |
| } |
| mmd_mask = mmd_mask >> 1; |
| fatal_mask = fatal_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 (efx->loopback_mode == LOOPBACK_NETWORK) |
| 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_NETWORK); |
| } |
| |
| static void efx_mdio_set_mmd_lpower(struct efx_nic *efx, |
| int lpower, int mmd) |
| { |
| int stat = efx_mdio_read(efx, mmd, MDIO_STAT1); |
| |
| EFX_TRACE(efx, "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; |
| |
| efx->phy_op->get_settings(efx, &prev); |
| |
| if (ecmd->advertising == prev.advertising && |
| ecmd->speed == prev.speed && |
| 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) |
| { |
| bool xnp = (efx->link_advertising & ADVERTISED_10000baseT_Full |
| || EFX_WORKAROUND_13204(efx)); |
| int reg; |
| |
| WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN)); |
| |
| /* Set up the base page */ |
| reg = ADVERTISE_CSMA; |
| if (efx->link_advertising & ADVERTISED_10baseT_Half) |
| reg |= ADVERTISE_10HALF; |
| if (efx->link_advertising & ADVERTISED_10baseT_Full) |
| reg |= ADVERTISE_10FULL; |
| if (efx->link_advertising & ADVERTISED_100baseT_Half) |
| reg |= ADVERTISE_100HALF; |
| if (efx->link_advertising & ADVERTISED_100baseT_Full) |
| reg |= ADVERTISE_100FULL; |
| if (xnp) |
| reg |= ADVERTISE_RESV; |
| else if (efx->link_advertising & (ADVERTISED_1000baseT_Half | |
| ADVERTISED_1000baseT_Full)) |
| reg |= ADVERTISE_NPAGE; |
| 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 if necessary */ |
| if (efx->phy_op->set_npage_adv) |
| 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; |
| if (!(EFX_WORKAROUND_15195(efx) && |
| LOOPBACK_MASK(efx) & efx->phy_op->loopbacks)) |
| reg |= MDIO_AN_CTRL1_RESTART; |
| if (xnp) |
| reg |= MDIO_AN_CTRL1_XNP; |
| else |
| reg &= ~MDIO_AN_CTRL1_XNP; |
| efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg); |
| } |
| |
| enum efx_fc_type 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)); |
| } |