1 /****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
3 * Copyright 2006-2009 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"
17 #include "workarounds.h"
19 unsigned efx_mdio_id_oui(u32 id)
24 /* The bits of the OUI are designated a..x, with a=0 and b variable.
25 * In the id register c is the MSB but the OUI is conventionally
26 * written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */
27 for (i = 0; i < 22; ++i)
28 if (id & (1 << (i + 10)))
34 int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
35 int spins, int spintime)
39 /* Catch callers passing values in the wrong units (or just silly) */
40 EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
42 efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
43 /* Wait for the reset bit to clear. */
46 ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
49 } while (spins && (ctrl & MDIO_CTRL1_RESET));
51 return spins ? spins : -ETIMEDOUT;
54 static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd, int fault_fatal)
58 if (LOOPBACK_INTERNAL(efx))
61 if (mmd != MDIO_MMD_AN) {
62 /* Read MMD STATUS2 to check it is responding. */
63 status = efx_mdio_read(efx, mmd, MDIO_STAT2);
64 if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
65 netif_err(efx, hw, efx->net_dev,
66 "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 netif_err(efx, hw, efx->net_dev,
76 "PHY MMD %d reporting fatal"
77 " fault: status %x\n", mmd, status);
80 netif_dbg(efx, hw, efx->net_dev,
81 "PHY MMD %d reporting status"
82 " %x (expected)\n", mmd, status);
88 /* This ought to be ridiculous overkill. We expect it to fail rarely */
89 #define MDIO45_RESET_TIME 1000 /* ms */
90 #define MDIO45_RESET_ITERS 100
92 int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
94 const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
95 int tries = MDIO45_RESET_ITERS;
106 stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
108 netif_err(efx, hw, efx->net_dev,
109 "failed to read status of"
113 if (stat & MDIO_CTRL1_RESET)
114 in_reset |= (1 << mmd);
125 netif_err(efx, hw, efx->net_dev,
126 "not all MMDs came out of reset in time."
127 " MMDs still in reset: %x\n", in_reset);
133 int efx_mdio_check_mmds(struct efx_nic *efx,
134 unsigned int mmd_mask, unsigned int fatal_mask)
136 int mmd = 0, probe_mmd, devs1, devs2;
139 /* Historically we have probed the PHYXS to find out what devices are
140 * present,but that doesn't work so well if the PHYXS isn't expected
141 * to exist, if so just find the first item in the list supplied. */
142 probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
145 /* Check all the expected MMDs are present */
146 devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
147 devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
148 if (devs1 < 0 || devs2 < 0) {
149 netif_err(efx, hw, efx->net_dev,
150 "failed to read devices present\n");
153 devices = devs1 | (devs2 << 16);
154 if ((devices & mmd_mask) != mmd_mask) {
155 netif_err(efx, hw, efx->net_dev,
156 "required MMDs not present: got %x, wanted %x\n",
160 netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
162 /* Check all required MMDs are responding and happy. */
165 int fault_fatal = fatal_mask & 1;
166 if (efx_mdio_check_mmd(efx, mmd, fault_fatal))
169 mmd_mask = mmd_mask >> 1;
170 fatal_mask = fatal_mask >> 1;
177 bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
179 /* If the port is in loopback, then we should only consider a subset
181 if (LOOPBACK_INTERNAL(efx))
183 else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
185 else if (efx_phy_mode_disabled(efx->phy_mode))
187 else if (efx->loopback_mode == LOOPBACK_PHYXS)
188 mmd_mask &= ~(MDIO_DEVS_PHYXS |
192 else if (efx->loopback_mode == LOOPBACK_PCS)
193 mmd_mask &= ~(MDIO_DEVS_PCS |
196 else if (efx->loopback_mode == LOOPBACK_PMAPMD)
197 mmd_mask &= ~(MDIO_DEVS_PMAPMD |
200 return mdio45_links_ok(&efx->mdio, mmd_mask);
203 void efx_mdio_transmit_disable(struct efx_nic *efx)
205 efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
206 MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
207 efx->phy_mode & PHY_MODE_TX_DISABLED);
210 void efx_mdio_phy_reconfigure(struct efx_nic *efx)
212 efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
213 MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
214 efx->loopback_mode == LOOPBACK_PMAPMD);
215 efx_mdio_set_flag(efx, MDIO_MMD_PCS,
216 MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
217 efx->loopback_mode == LOOPBACK_PCS);
218 efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
219 MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
220 efx->loopback_mode == LOOPBACK_PHYXS_WS);
223 static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
226 int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
228 netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
231 if (stat & MDIO_STAT1_LPOWERABLE) {
232 efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
233 MDIO_CTRL1_LPOWER, lpower);
237 void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
238 int low_power, unsigned int mmd_mask)
241 mmd_mask &= ~MDIO_DEVS_AN;
244 efx_mdio_set_mmd_lpower(efx, low_power, mmd);
245 mmd_mask = (mmd_mask >> 1);
251 * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
253 * @ecmd: New settings
255 int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
257 struct ethtool_cmd prev;
259 efx->phy_op->get_settings(efx, &prev);
261 if (ecmd->advertising == prev.advertising &&
262 ecmd->speed == prev.speed &&
263 ecmd->duplex == prev.duplex &&
264 ecmd->port == prev.port &&
265 ecmd->autoneg == prev.autoneg)
268 /* We can only change these settings for -T PHYs */
269 if (prev.port != PORT_TP || ecmd->port != PORT_TP)
272 /* Check that PHY supports these settings */
273 if (!ecmd->autoneg ||
274 (ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
277 efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
278 efx_mdio_an_reconfigure(efx);
283 * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
286 void efx_mdio_an_reconfigure(struct efx_nic *efx)
290 WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
292 /* Set up the base page */
293 reg = ADVERTISE_CSMA | ADVERTISE_RESV;
294 if (efx->link_advertising & ADVERTISED_Pause)
295 reg |= ADVERTISE_PAUSE_CAP;
296 if (efx->link_advertising & ADVERTISED_Asym_Pause)
297 reg |= ADVERTISE_PAUSE_ASYM;
298 efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
300 /* Set up the (extended) next page */
301 efx->phy_op->set_npage_adv(efx, efx->link_advertising);
303 /* Enable and restart AN */
304 reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
305 reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
306 efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
309 enum efx_fc_type efx_mdio_get_pause(struct efx_nic *efx)
311 BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
313 if (!(efx->wanted_fc & EFX_FC_AUTO))
314 return efx->wanted_fc;
316 WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
318 return mii_resolve_flowctrl_fdx(
319 mii_advertise_flowctrl(efx->wanted_fc),
320 efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
323 int efx_mdio_test_alive(struct efx_nic *efx)
326 int devad = __ffs(efx->mdio.mmds);
327 u16 physid1, physid2;
329 mutex_lock(&efx->mac_lock);
331 physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
332 physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
334 if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
335 (physid2 == 0x0000) || (physid2 == 0xffff)) {
336 netif_err(efx, hw, efx->net_dev,
337 "no MDIO PHY present with ID %d\n", efx->mdio.prtad);
340 rc = efx_mdio_check_mmds(efx, efx->mdio.mmds, 0);
343 mutex_unlock(&efx->mac_lock);