1 /****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
3 * Copyright 2006-2008 Solarflare Communications Inc.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation, incorporated herein by reference.
10 * Useful functions for working with MDIO clause 45 PHYs
12 #include <linux/types.h>
13 #include <linux/ethtool.h>
14 #include <linux/delay.h>
15 #include "net_driver.h"
18 #include "workarounds.h"
20 unsigned efx_mdio_id_oui(u32 id)
25 /* The bits of the OUI are designated a..x, with a=0 and b variable.
26 * In the id register c is the MSB but the OUI is conventionally
27 * written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */
28 for (i = 0; i < 22; ++i)
29 if (id & (1 << (i + 10)))
35 int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
36 int spins, int spintime)
40 /* Catch callers passing values in the wrong units (or just silly) */
41 EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
43 efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
44 /* Wait for the reset bit to clear. */
47 ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
50 } while (spins && (ctrl & MDIO_CTRL1_RESET));
52 return spins ? spins : -ETIMEDOUT;
55 static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd, int fault_fatal)
59 if (LOOPBACK_INTERNAL(efx))
62 if (mmd != MDIO_MMD_AN) {
63 /* Read MMD STATUS2 to check it is responding. */
64 status = efx_mdio_read(efx, mmd, MDIO_STAT2);
65 if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
66 EFX_ERR(efx, "PHY MMD %d not responding.\n", mmd);
71 /* Read MMD STATUS 1 to check for fault. */
72 status = efx_mdio_read(efx, mmd, MDIO_STAT1);
73 if (status & MDIO_STAT1_FAULT) {
75 EFX_ERR(efx, "PHY MMD %d reporting fatal"
76 " fault: status %x\n", mmd, status);
79 EFX_LOG(efx, "PHY MMD %d reporting status"
80 " %x (expected)\n", mmd, status);
86 /* This ought to be ridiculous overkill. We expect it to fail rarely */
87 #define MDIO45_RESET_TIME 1000 /* ms */
88 #define MDIO45_RESET_ITERS 100
90 int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
92 const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
93 int tries = MDIO45_RESET_ITERS;
104 stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
106 EFX_ERR(efx, "failed to read status of"
110 if (stat & MDIO_CTRL1_RESET)
111 in_reset |= (1 << mmd);
122 EFX_ERR(efx, "not all MMDs came out of reset in time."
123 " MMDs still in reset: %x\n", in_reset);
129 int efx_mdio_check_mmds(struct efx_nic *efx,
130 unsigned int mmd_mask, unsigned int fatal_mask)
132 int mmd = 0, probe_mmd, devs1, devs2;
135 /* Historically we have probed the PHYXS to find out what devices are
136 * present,but that doesn't work so well if the PHYXS isn't expected
137 * to exist, if so just find the first item in the list supplied. */
138 probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
141 /* Check all the expected MMDs are present */
142 devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
143 devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
144 if (devs1 < 0 || devs2 < 0) {
145 EFX_ERR(efx, "failed to read devices present\n");
148 devices = devs1 | (devs2 << 16);
149 if ((devices & mmd_mask) != mmd_mask) {
150 EFX_ERR(efx, "required MMDs not present: got %x, "
151 "wanted %x\n", devices, mmd_mask);
154 EFX_TRACE(efx, "Devices present: %x\n", devices);
156 /* Check all required MMDs are responding and happy. */
159 int fault_fatal = fatal_mask & 1;
160 if (efx_mdio_check_mmd(efx, mmd, fault_fatal))
163 mmd_mask = mmd_mask >> 1;
164 fatal_mask = fatal_mask >> 1;
171 bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
173 /* If the port is in loopback, then we should only consider a subset
175 if (LOOPBACK_INTERNAL(efx))
177 else if (efx->loopback_mode == LOOPBACK_NETWORK)
179 else if (efx_phy_mode_disabled(efx->phy_mode))
181 else if (efx->loopback_mode == LOOPBACK_PHYXS)
182 mmd_mask &= ~(MDIO_DEVS_PHYXS |
186 else if (efx->loopback_mode == LOOPBACK_PCS)
187 mmd_mask &= ~(MDIO_DEVS_PCS |
190 else if (efx->loopback_mode == LOOPBACK_PMAPMD)
191 mmd_mask &= ~(MDIO_DEVS_PMAPMD |
194 return mdio45_links_ok(&efx->mdio, mmd_mask);
197 void efx_mdio_transmit_disable(struct efx_nic *efx)
199 efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
200 MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
201 efx->phy_mode & PHY_MODE_TX_DISABLED);
204 void efx_mdio_phy_reconfigure(struct efx_nic *efx)
206 efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
207 MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
208 efx->loopback_mode == LOOPBACK_PMAPMD);
209 efx_mdio_set_flag(efx, MDIO_MMD_PCS,
210 MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
211 efx->loopback_mode == LOOPBACK_PCS);
212 efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
213 MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
214 efx->loopback_mode == LOOPBACK_NETWORK);
217 static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
220 int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
222 EFX_TRACE(efx, "Setting low power mode for MMD %d to %d\n",
225 if (stat & MDIO_STAT1_LPOWERABLE) {
226 efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
227 MDIO_CTRL1_LPOWER, lpower);
231 void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
232 int low_power, unsigned int mmd_mask)
235 mmd_mask &= ~MDIO_DEVS_AN;
238 efx_mdio_set_mmd_lpower(efx, low_power, mmd);
239 mmd_mask = (mmd_mask >> 1);
245 * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
247 * @ecmd: New settings
249 int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
251 struct ethtool_cmd prev;
255 efx->phy_op->get_settings(efx, &prev);
257 if (ecmd->advertising == prev.advertising &&
258 ecmd->speed == prev.speed &&
259 ecmd->duplex == prev.duplex &&
260 ecmd->port == prev.port &&
261 ecmd->autoneg == prev.autoneg)
264 /* We can only change these settings for -T PHYs */
265 if (prev.port != PORT_TP || ecmd->port != PORT_TP)
268 /* Check that PHY supports these settings */
270 required = SUPPORTED_Autoneg;
271 } else if (ecmd->duplex) {
272 switch (ecmd->speed) {
273 case SPEED_10: required = SUPPORTED_10baseT_Full; break;
274 case SPEED_100: required = SUPPORTED_100baseT_Full; break;
275 default: return -EINVAL;
278 switch (ecmd->speed) {
279 case SPEED_10: required = SUPPORTED_10baseT_Half; break;
280 case SPEED_100: required = SUPPORTED_100baseT_Half; break;
281 default: return -EINVAL;
284 required |= ecmd->advertising;
285 if (required & ~prev.supported)
289 bool xnp = (ecmd->advertising & ADVERTISED_10000baseT_Full
290 || EFX_WORKAROUND_13204(efx));
292 /* Set up the base page */
293 reg = ADVERTISE_CSMA;
294 if (ecmd->advertising & ADVERTISED_10baseT_Half)
295 reg |= ADVERTISE_10HALF;
296 if (ecmd->advertising & ADVERTISED_10baseT_Full)
297 reg |= ADVERTISE_10FULL;
298 if (ecmd->advertising & ADVERTISED_100baseT_Half)
299 reg |= ADVERTISE_100HALF;
300 if (ecmd->advertising & ADVERTISED_100baseT_Full)
301 reg |= ADVERTISE_100FULL;
303 reg |= ADVERTISE_RESV;
304 else if (ecmd->advertising & (ADVERTISED_1000baseT_Half |
305 ADVERTISED_1000baseT_Full))
306 reg |= ADVERTISE_NPAGE;
307 reg |= mii_advertise_flowctrl(efx->wanted_fc);
308 efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
310 /* Set up the (extended) next page if necessary */
311 if (efx->phy_op->set_npage_adv)
312 efx->phy_op->set_npage_adv(efx, ecmd->advertising);
314 /* Enable and restart AN */
315 reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
316 reg |= MDIO_AN_CTRL1_ENABLE;
317 if (!(EFX_WORKAROUND_15195(efx) &&
318 LOOPBACK_MASK(efx) & efx->phy_op->loopbacks))
319 reg |= MDIO_AN_CTRL1_RESTART;
321 reg |= MDIO_AN_CTRL1_XNP;
323 reg &= ~MDIO_AN_CTRL1_XNP;
324 efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
327 efx_mdio_set_flag(efx, MDIO_MMD_AN, MDIO_CTRL1,
328 MDIO_AN_CTRL1_ENABLE, false);
330 /* Set the basic control bits */
331 reg = efx_mdio_read(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1);
332 reg &= ~(MDIO_CTRL1_SPEEDSEL | MDIO_CTRL1_FULLDPLX);
333 if (ecmd->speed == SPEED_100)
334 reg |= MDIO_PMA_CTRL1_SPEED100;
336 reg |= MDIO_CTRL1_FULLDPLX;
337 efx_mdio_write(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1, reg);
343 enum efx_fc_type efx_mdio_get_pause(struct efx_nic *efx)
347 if (!(efx->phy_op->mmds & MDIO_DEVS_AN))
348 return efx->wanted_fc;
349 lpa = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA);
350 return efx_fc_resolve(efx->wanted_fc, lpa);