1/****************************************************************************
  2 * Driver for Solarflare network controllers and boards
  3 * Copyright 2006-2011 Solarflare Communications Inc.
  4 *
  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.
  8 */
  9/*
 10 * Useful functions for working with MDIO clause 45 PHYs
 11 */
 12#include <linux/types.h>
 13#include <linux/ethtool.h>
 14#include <linux/delay.h>
 15#include "net_driver.h"
 16#include "mdio_10g.h"
 17#include "workarounds.h"
 18
 19unsigned efx_mdio_id_oui(u32 id)
 20{
 21	unsigned oui = 0;
 22	int i;
 23
 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)))
 29			oui |= 1 << (i ^ 7);
 30
 31	return oui;
 32}
 33
 34int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
 35			    int spins, int spintime)
 36{
 37	u32 ctrl;
 38
 39	/* Catch callers passing values in the wrong units (or just silly) */
 40	EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
 41
 42	efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
 43	/* Wait for the reset bit to clear. */
 44	do {
 45		msleep(spintime);
 46		ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
 47		spins--;
 48
 49	} while (spins && (ctrl & MDIO_CTRL1_RESET));
 50
 51	return spins ? spins : -ETIMEDOUT;
 52}
 53
 54static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd)
 55{
 56	int status;
 57
 58	if (mmd != MDIO_MMD_AN) {
 59		/* Read MMD STATUS2 to check it is responding. */
 60		status = efx_mdio_read(efx, mmd, MDIO_STAT2);
 61		if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
 62			netif_err(efx, hw, efx->net_dev,
 63				  "PHY MMD %d not responding.\n", mmd);
 64			return -EIO;
 65		}
 66	}
 67
 68	return 0;
 69}
 70
 71/* This ought to be ridiculous overkill. We expect it to fail rarely */
 72#define MDIO45_RESET_TIME	1000 /* ms */
 73#define MDIO45_RESET_ITERS	100
 74
 75int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
 76{
 77	const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
 78	int tries = MDIO45_RESET_ITERS;
 79	int rc = 0;
 80	int in_reset;
 81
 82	while (tries) {
 83		int mask = mmd_mask;
 84		int mmd = 0;
 85		int stat;
 86		in_reset = 0;
 87		while (mask) {
 88			if (mask & 1) {
 89				stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
 90				if (stat < 0) {
 91					netif_err(efx, hw, efx->net_dev,
 92						  "failed to read status of"
 93						  " MMD %d\n", mmd);
 94					return -EIO;
 95				}
 96				if (stat & MDIO_CTRL1_RESET)
 97					in_reset |= (1 << mmd);
 98			}
 99			mask = mask >> 1;
100			mmd++;
101		}
102		if (!in_reset)
103			break;
104		tries--;
105		msleep(spintime);
106	}
107	if (in_reset != 0) {
108		netif_err(efx, hw, efx->net_dev,
109			  "not all MMDs came out of reset in time."
110			  " MMDs still in reset: %x\n", in_reset);
111		rc = -ETIMEDOUT;
112	}
113	return rc;
114}
115
116int efx_mdio_check_mmds(struct efx_nic *efx, unsigned int mmd_mask)
117{
118	int mmd = 0, probe_mmd, devs1, devs2;
119	u32 devices;
120
121	/* Historically we have probed the PHYXS to find out what devices are
122	 * present,but that doesn't work so well if the PHYXS isn't expected
123	 * to exist, if so just find the first item in the list supplied. */
124	probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
125	    __ffs(mmd_mask);
126
127	/* Check all the expected MMDs are present */
128	devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
129	devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
130	if (devs1 < 0 || devs2 < 0) {
131		netif_err(efx, hw, efx->net_dev,
132			  "failed to read devices present\n");
133		return -EIO;
134	}
135	devices = devs1 | (devs2 << 16);
136	if ((devices & mmd_mask) != mmd_mask) {
137		netif_err(efx, hw, efx->net_dev,
138			  "required MMDs not present: got %x, wanted %x\n",
139			  devices, mmd_mask);
140		return -ENODEV;
141	}
142	netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
143
144	/* Check all required MMDs are responding and happy. */
145	while (mmd_mask) {
146		if ((mmd_mask & 1) && efx_mdio_check_mmd(efx, mmd))
147			return -EIO;
148		mmd_mask = mmd_mask >> 1;
149		mmd++;
150	}
151
152	return 0;
153}
154
155bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
156{
157	/* If the port is in loopback, then we should only consider a subset
158	 * of mmd's */
159	if (LOOPBACK_INTERNAL(efx))
160		return true;
161	else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
162		return false;
163	else if (efx_phy_mode_disabled(efx->phy_mode))
164		return false;
165	else if (efx->loopback_mode == LOOPBACK_PHYXS)
166		mmd_mask &= ~(MDIO_DEVS_PHYXS |
167			      MDIO_DEVS_PCS |
168			      MDIO_DEVS_PMAPMD |
169			      MDIO_DEVS_AN);
170	else if (efx->loopback_mode == LOOPBACK_PCS)
171		mmd_mask &= ~(MDIO_DEVS_PCS |
172			      MDIO_DEVS_PMAPMD |
173			      MDIO_DEVS_AN);
174	else if (efx->loopback_mode == LOOPBACK_PMAPMD)
175		mmd_mask &= ~(MDIO_DEVS_PMAPMD |
176			      MDIO_DEVS_AN);
177
178	return mdio45_links_ok(&efx->mdio, mmd_mask);
179}
180
181void efx_mdio_transmit_disable(struct efx_nic *efx)
182{
183	efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
184			  MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
185			  efx->phy_mode & PHY_MODE_TX_DISABLED);
186}
187
188void efx_mdio_phy_reconfigure(struct efx_nic *efx)
189{
190	efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
191			  MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
192			  efx->loopback_mode == LOOPBACK_PMAPMD);
193	efx_mdio_set_flag(efx, MDIO_MMD_PCS,
194			  MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
195			  efx->loopback_mode == LOOPBACK_PCS);
196	efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
197			  MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
198			  efx->loopback_mode == LOOPBACK_PHYXS_WS);
199}
200
201static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
202				    int lpower, int mmd)
203{
204	int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
205
206	netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
207		  mmd, lpower);
208
209	if (stat & MDIO_STAT1_LPOWERABLE) {
210		efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
211				  MDIO_CTRL1_LPOWER, lpower);
212	}
213}
214
215void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
216			      int low_power, unsigned int mmd_mask)
217{
218	int mmd = 0;
219	mmd_mask &= ~MDIO_DEVS_AN;
220	while (mmd_mask) {
221		if (mmd_mask & 1)
222			efx_mdio_set_mmd_lpower(efx, low_power, mmd);
223		mmd_mask = (mmd_mask >> 1);
224		mmd++;
225	}
226}
227
228/**
229 * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
230 * @efx:		Efx NIC
231 * @ecmd:		New settings
232 */
233int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
234{
235	struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };
236
237	efx->phy_op->get_settings(efx, &prev);
238
239	if (ecmd->advertising == prev.advertising &&
240	    ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
241	    ecmd->duplex == prev.duplex &&
242	    ecmd->port == prev.port &&
243	    ecmd->autoneg == prev.autoneg)
244		return 0;
245
246	/* We can only change these settings for -T PHYs */
247	if (prev.port != PORT_TP || ecmd->port != PORT_TP)
248		return -EINVAL;
249
250	/* Check that PHY supports these settings */
251	if (!ecmd->autoneg ||
252	    (ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
253		return -EINVAL;
254
255	efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
256	efx_mdio_an_reconfigure(efx);
257	return 0;
258}
259
260/**
261 * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
262 * @efx:		Efx NIC
263 */
264void efx_mdio_an_reconfigure(struct efx_nic *efx)
265{
266	int reg;
267
268	WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
269
270	/* Set up the base page */
271	reg = ADVERTISE_CSMA | ADVERTISE_RESV;
272	if (efx->link_advertising & ADVERTISED_Pause)
273		reg |= ADVERTISE_PAUSE_CAP;
274	if (efx->link_advertising & ADVERTISED_Asym_Pause)
275		reg |= ADVERTISE_PAUSE_ASYM;
276	efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
277
278	/* Set up the (extended) next page */
279	efx->phy_op->set_npage_adv(efx, efx->link_advertising);
280
281	/* Enable and restart AN */
282	reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
283	reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
284	efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
285}
286
287u8 efx_mdio_get_pause(struct efx_nic *efx)
288{
289	BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
290
291	if (!(efx->wanted_fc & EFX_FC_AUTO))
292		return efx->wanted_fc;
293
294	WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
295
296	return mii_resolve_flowctrl_fdx(
297		mii_advertise_flowctrl(efx->wanted_fc),
298		efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
299}
300
301int efx_mdio_test_alive(struct efx_nic *efx)
302{
303	int rc;
304	int devad = __ffs(efx->mdio.mmds);
305	u16 physid1, physid2;
306
307	mutex_lock(&efx->mac_lock);
308
309	physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
310	physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
311
312	if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
313	    (physid2 == 0x0000) || (physid2 == 0xffff)) {
314		netif_err(efx, hw, efx->net_dev,
315			  "no MDIO PHY present with ID %d\n", efx->mdio.prtad);
316		rc = -EINVAL;
317	} else {
318		rc = efx_mdio_check_mmds(efx, efx->mdio.mmds);
319	}
320
321	mutex_unlock(&efx->mac_lock);
322	return rc;
323}