1 // SPDX-License-Identifier: GPL-2.0-only
2 /****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2006-2011 Solarflare Communications Inc.
5 */
6 /*
7 * Useful functions for working with MDIO clause 45 PHYs
8 */
9 #include <linux/types.h>
10 #include <linux/ethtool.h>
11 #include <linux/delay.h>
12 #include "net_driver.h"
13 #include "mdio_10g.h"
14 #include "workarounds.h"
15
ef4_mdio_id_oui(u32 id)16 unsigned ef4_mdio_id_oui(u32 id)
17 {
18 unsigned oui = 0;
19 int i;
20
21 /* The bits of the OUI are designated a..x, with a=0 and b variable.
22 * In the id register c is the MSB but the OUI is conventionally
23 * written as bytes h..a, p..i, x..q. Reorder the bits accordingly. */
24 for (i = 0; i < 22; ++i)
25 if (id & (1 << (i + 10)))
26 oui |= 1 << (i ^ 7);
27
28 return oui;
29 }
30
ef4_mdio_reset_mmd(struct ef4_nic * port,int mmd,int spins,int spintime)31 int ef4_mdio_reset_mmd(struct ef4_nic *port, int mmd,
32 int spins, int spintime)
33 {
34 u32 ctrl;
35
36 /* Catch callers passing values in the wrong units (or just silly) */
37 EF4_BUG_ON_PARANOID(spins * spintime >= 5000);
38
39 ef4_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
40 /* Wait for the reset bit to clear. */
41 do {
42 msleep(spintime);
43 ctrl = ef4_mdio_read(port, mmd, MDIO_CTRL1);
44 spins--;
45
46 } while (spins && (ctrl & MDIO_CTRL1_RESET));
47
48 return spins ? spins : -ETIMEDOUT;
49 }
50
ef4_mdio_check_mmd(struct ef4_nic * efx,int mmd)51 static int ef4_mdio_check_mmd(struct ef4_nic *efx, int mmd)
52 {
53 int status;
54
55 if (mmd != MDIO_MMD_AN) {
56 /* Read MMD STATUS2 to check it is responding. */
57 status = ef4_mdio_read(efx, mmd, MDIO_STAT2);
58 if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
59 netif_err(efx, hw, efx->net_dev,
60 "PHY MMD %d not responding.\n", mmd);
61 return -EIO;
62 }
63 }
64
65 return 0;
66 }
67
68 /* This ought to be ridiculous overkill. We expect it to fail rarely */
69 #define MDIO45_RESET_TIME 1000 /* ms */
70 #define MDIO45_RESET_ITERS 100
71
ef4_mdio_wait_reset_mmds(struct ef4_nic * efx,unsigned int mmd_mask)72 int ef4_mdio_wait_reset_mmds(struct ef4_nic *efx, unsigned int mmd_mask)
73 {
74 const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
75 int tries = MDIO45_RESET_ITERS;
76 int rc = 0;
77 int in_reset;
78
79 while (tries) {
80 int mask = mmd_mask;
81 int mmd = 0;
82 int stat;
83 in_reset = 0;
84 while (mask) {
85 if (mask & 1) {
86 stat = ef4_mdio_read(efx, mmd, MDIO_CTRL1);
87 if (stat < 0) {
88 netif_err(efx, hw, efx->net_dev,
89 "failed to read status of"
90 " MMD %d\n", mmd);
91 return -EIO;
92 }
93 if (stat & MDIO_CTRL1_RESET)
94 in_reset |= (1 << mmd);
95 }
96 mask = mask >> 1;
97 mmd++;
98 }
99 if (!in_reset)
100 break;
101 tries--;
102 msleep(spintime);
103 }
104 if (in_reset != 0) {
105 netif_err(efx, hw, efx->net_dev,
106 "not all MMDs came out of reset in time."
107 " MMDs still in reset: %x\n", in_reset);
108 rc = -ETIMEDOUT;
109 }
110 return rc;
111 }
112
ef4_mdio_check_mmds(struct ef4_nic * efx,unsigned int mmd_mask)113 int ef4_mdio_check_mmds(struct ef4_nic *efx, unsigned int mmd_mask)
114 {
115 int mmd = 0, probe_mmd, devs1, devs2;
116 u32 devices;
117
118 /* Historically we have probed the PHYXS to find out what devices are
119 * present,but that doesn't work so well if the PHYXS isn't expected
120 * to exist, if so just find the first item in the list supplied. */
121 probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
122 __ffs(mmd_mask);
123
124 /* Check all the expected MMDs are present */
125 devs1 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS1);
126 devs2 = ef4_mdio_read(efx, probe_mmd, MDIO_DEVS2);
127 if (devs1 < 0 || devs2 < 0) {
128 netif_err(efx, hw, efx->net_dev,
129 "failed to read devices present\n");
130 return -EIO;
131 }
132 devices = devs1 | (devs2 << 16);
133 if ((devices & mmd_mask) != mmd_mask) {
134 netif_err(efx, hw, efx->net_dev,
135 "required MMDs not present: got %x, wanted %x\n",
136 devices, mmd_mask);
137 return -ENODEV;
138 }
139 netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
140
141 /* Check all required MMDs are responding and happy. */
142 while (mmd_mask) {
143 if ((mmd_mask & 1) && ef4_mdio_check_mmd(efx, mmd))
144 return -EIO;
145 mmd_mask = mmd_mask >> 1;
146 mmd++;
147 }
148
149 return 0;
150 }
151
ef4_mdio_links_ok(struct ef4_nic * efx,unsigned int mmd_mask)152 bool ef4_mdio_links_ok(struct ef4_nic *efx, unsigned int mmd_mask)
153 {
154 /* If the port is in loopback, then we should only consider a subset
155 * of mmd's */
156 if (LOOPBACK_INTERNAL(efx))
157 return true;
158 else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
159 return false;
160 else if (ef4_phy_mode_disabled(efx->phy_mode))
161 return false;
162 else if (efx->loopback_mode == LOOPBACK_PHYXS)
163 mmd_mask &= ~(MDIO_DEVS_PHYXS |
164 MDIO_DEVS_PCS |
165 MDIO_DEVS_PMAPMD |
166 MDIO_DEVS_AN);
167 else if (efx->loopback_mode == LOOPBACK_PCS)
168 mmd_mask &= ~(MDIO_DEVS_PCS |
169 MDIO_DEVS_PMAPMD |
170 MDIO_DEVS_AN);
171 else if (efx->loopback_mode == LOOPBACK_PMAPMD)
172 mmd_mask &= ~(MDIO_DEVS_PMAPMD |
173 MDIO_DEVS_AN);
174
175 return mdio45_links_ok(&efx->mdio, mmd_mask);
176 }
177
ef4_mdio_transmit_disable(struct ef4_nic * efx)178 void ef4_mdio_transmit_disable(struct ef4_nic *efx)
179 {
180 ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
181 MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
182 efx->phy_mode & PHY_MODE_TX_DISABLED);
183 }
184
ef4_mdio_phy_reconfigure(struct ef4_nic * efx)185 void ef4_mdio_phy_reconfigure(struct ef4_nic *efx)
186 {
187 ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
188 MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
189 efx->loopback_mode == LOOPBACK_PMAPMD);
190 ef4_mdio_set_flag(efx, MDIO_MMD_PCS,
191 MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
192 efx->loopback_mode == LOOPBACK_PCS);
193 ef4_mdio_set_flag(efx, MDIO_MMD_PHYXS,
194 MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
195 efx->loopback_mode == LOOPBACK_PHYXS_WS);
196 }
197
ef4_mdio_set_mmd_lpower(struct ef4_nic * efx,int lpower,int mmd)198 static void ef4_mdio_set_mmd_lpower(struct ef4_nic *efx,
199 int lpower, int mmd)
200 {
201 int stat = ef4_mdio_read(efx, mmd, MDIO_STAT1);
202
203 netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
204 mmd, lpower);
205
206 if (stat & MDIO_STAT1_LPOWERABLE) {
207 ef4_mdio_set_flag(efx, mmd, MDIO_CTRL1,
208 MDIO_CTRL1_LPOWER, lpower);
209 }
210 }
211
ef4_mdio_set_mmds_lpower(struct ef4_nic * efx,int low_power,unsigned int mmd_mask)212 void ef4_mdio_set_mmds_lpower(struct ef4_nic *efx,
213 int low_power, unsigned int mmd_mask)
214 {
215 int mmd = 0;
216 mmd_mask &= ~MDIO_DEVS_AN;
217 while (mmd_mask) {
218 if (mmd_mask & 1)
219 ef4_mdio_set_mmd_lpower(efx, low_power, mmd);
220 mmd_mask = (mmd_mask >> 1);
221 mmd++;
222 }
223 }
224
225 /**
226 * ef4_mdio_set_link_ksettings - Set (some of) the PHY settings over MDIO.
227 * @efx: Efx NIC
228 * @cmd: New settings
229 */
ef4_mdio_set_link_ksettings(struct ef4_nic * efx,const struct ethtool_link_ksettings * cmd)230 int ef4_mdio_set_link_ksettings(struct ef4_nic *efx,
231 const struct ethtool_link_ksettings *cmd)
232 {
233 struct ethtool_link_ksettings prev = {
234 .base.cmd = ETHTOOL_GLINKSETTINGS
235 };
236 u32 prev_advertising, advertising;
237 u32 prev_supported;
238
239 efx->phy_op->get_link_ksettings(efx, &prev);
240
241 ethtool_convert_link_mode_to_legacy_u32(&advertising,
242 cmd->link_modes.advertising);
243 ethtool_convert_link_mode_to_legacy_u32(&prev_advertising,
244 prev.link_modes.advertising);
245 ethtool_convert_link_mode_to_legacy_u32(&prev_supported,
246 prev.link_modes.supported);
247
248 if (advertising == prev_advertising &&
249 cmd->base.speed == prev.base.speed &&
250 cmd->base.duplex == prev.base.duplex &&
251 cmd->base.port == prev.base.port &&
252 cmd->base.autoneg == prev.base.autoneg)
253 return 0;
254
255 /* We can only change these settings for -T PHYs */
256 if (prev.base.port != PORT_TP || cmd->base.port != PORT_TP)
257 return -EINVAL;
258
259 /* Check that PHY supports these settings */
260 if (!cmd->base.autoneg ||
261 (advertising | SUPPORTED_Autoneg) & ~prev_supported)
262 return -EINVAL;
263
264 ef4_link_set_advertising(efx, advertising | ADVERTISED_Autoneg);
265 ef4_mdio_an_reconfigure(efx);
266 return 0;
267 }
268
269 /**
270 * ef4_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
271 * @efx: Efx NIC
272 */
ef4_mdio_an_reconfigure(struct ef4_nic * efx)273 void ef4_mdio_an_reconfigure(struct ef4_nic *efx)
274 {
275 int reg;
276
277 WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
278
279 /* Set up the base page */
280 reg = ADVERTISE_CSMA | ADVERTISE_RESV;
281 if (efx->link_advertising & ADVERTISED_Pause)
282 reg |= ADVERTISE_PAUSE_CAP;
283 if (efx->link_advertising & ADVERTISED_Asym_Pause)
284 reg |= ADVERTISE_PAUSE_ASYM;
285 ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
286
287 /* Set up the (extended) next page */
288 efx->phy_op->set_npage_adv(efx, efx->link_advertising);
289
290 /* Enable and restart AN */
291 reg = ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
292 reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
293 ef4_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
294 }
295
ef4_mdio_get_pause(struct ef4_nic * efx)296 u8 ef4_mdio_get_pause(struct ef4_nic *efx)
297 {
298 BUILD_BUG_ON(EF4_FC_AUTO & (EF4_FC_RX | EF4_FC_TX));
299
300 if (!(efx->wanted_fc & EF4_FC_AUTO))
301 return efx->wanted_fc;
302
303 WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
304
305 return mii_resolve_flowctrl_fdx(
306 mii_advertise_flowctrl(efx->wanted_fc),
307 ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
308 }
309
ef4_mdio_test_alive(struct ef4_nic * efx)310 int ef4_mdio_test_alive(struct ef4_nic *efx)
311 {
312 int rc;
313 int devad = __ffs(efx->mdio.mmds);
314 u16 physid1, physid2;
315
316 mutex_lock(&efx->mac_lock);
317
318 physid1 = ef4_mdio_read(efx, devad, MDIO_DEVID1);
319 physid2 = ef4_mdio_read(efx, devad, MDIO_DEVID2);
320
321 if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
322 (physid2 == 0x0000) || (physid2 == 0xffff)) {
323 netif_err(efx, hw, efx->net_dev,
324 "no MDIO PHY present with ID %d\n", efx->mdio.prtad);
325 rc = -EINVAL;
326 } else {
327 rc = ef4_mdio_check_mmds(efx, efx->mdio.mmds);
328 }
329
330 mutex_unlock(&efx->mac_lock);
331 return rc;
332 }
333