1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Broadcom GENET (Gigabit Ethernet) Wake-on-LAN support
4 *
5 * Copyright (c) 2014-2020 Broadcom
6 */
7
8 #define pr_fmt(fmt) "bcmgenet_wol: " fmt
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/sched.h>
13 #include <linux/types.h>
14 #include <linux/interrupt.h>
15 #include <linux/string.h>
16 #include <linux/init.h>
17 #include <linux/errno.h>
18 #include <linux/delay.h>
19 #include <linux/pm.h>
20 #include <linux/clk.h>
21 #include <linux/version.h>
22 #include <linux/platform_device.h>
23 #include <net/arp.h>
24
25 #include <linux/mii.h>
26 #include <linux/ethtool.h>
27 #include <linux/netdevice.h>
28 #include <linux/inetdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/skbuff.h>
31 #include <linux/in.h>
32 #include <linux/ip.h>
33 #include <linux/ipv6.h>
34 #include <linux/phy.h>
35
36 #include "bcmgenet.h"
37
38 /* ethtool function - get WOL (Wake on LAN) settings, Only Magic Packet
39 * Detection is supported through ethtool
40 */
bcmgenet_get_wol(struct net_device * dev,struct ethtool_wolinfo * wol)41 void bcmgenet_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
42 {
43 struct bcmgenet_priv *priv = netdev_priv(dev);
44 struct device *kdev = &priv->pdev->dev;
45
46 if (!device_can_wakeup(kdev)) {
47 wol->supported = 0;
48 wol->wolopts = 0;
49 return;
50 }
51
52 wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER;
53 wol->wolopts = priv->wolopts;
54 memset(wol->sopass, 0, sizeof(wol->sopass));
55
56 if (wol->wolopts & WAKE_MAGICSECURE)
57 memcpy(wol->sopass, priv->sopass, sizeof(priv->sopass));
58 }
59
60 /* ethtool function - set WOL (Wake on LAN) settings.
61 * Only for magic packet detection mode.
62 */
bcmgenet_set_wol(struct net_device * dev,struct ethtool_wolinfo * wol)63 int bcmgenet_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
64 {
65 struct bcmgenet_priv *priv = netdev_priv(dev);
66 struct device *kdev = &priv->pdev->dev;
67
68 if (!device_can_wakeup(kdev))
69 return -ENOTSUPP;
70
71 if (wol->wolopts & ~(WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER))
72 return -EINVAL;
73
74 if (wol->wolopts & WAKE_MAGICSECURE)
75 memcpy(priv->sopass, wol->sopass, sizeof(priv->sopass));
76
77 /* Flag the device and relevant IRQ as wakeup capable */
78 if (wol->wolopts) {
79 device_set_wakeup_enable(kdev, 1);
80 /* Avoid unbalanced enable_irq_wake calls */
81 if (priv->wol_irq_disabled)
82 enable_irq_wake(priv->wol_irq);
83 priv->wol_irq_disabled = false;
84 } else {
85 device_set_wakeup_enable(kdev, 0);
86 /* Avoid unbalanced disable_irq_wake calls */
87 if (!priv->wol_irq_disabled)
88 disable_irq_wake(priv->wol_irq);
89 priv->wol_irq_disabled = true;
90 }
91
92 priv->wolopts = wol->wolopts;
93
94 return 0;
95 }
96
bcmgenet_poll_wol_status(struct bcmgenet_priv * priv)97 static int bcmgenet_poll_wol_status(struct bcmgenet_priv *priv)
98 {
99 struct net_device *dev = priv->dev;
100 int retries = 0;
101
102 while (!(bcmgenet_rbuf_readl(priv, RBUF_STATUS)
103 & RBUF_STATUS_WOL)) {
104 retries++;
105 if (retries > 5) {
106 netdev_crit(dev, "polling wol mode timeout\n");
107 return -ETIMEDOUT;
108 }
109 mdelay(1);
110 }
111
112 return retries;
113 }
114
bcmgenet_set_mpd_password(struct bcmgenet_priv * priv)115 static void bcmgenet_set_mpd_password(struct bcmgenet_priv *priv)
116 {
117 bcmgenet_umac_writel(priv, get_unaligned_be16(&priv->sopass[0]),
118 UMAC_MPD_PW_MS);
119 bcmgenet_umac_writel(priv, get_unaligned_be32(&priv->sopass[2]),
120 UMAC_MPD_PW_LS);
121 }
122
bcmgenet_wol_power_down_cfg(struct bcmgenet_priv * priv,enum bcmgenet_power_mode mode)123 int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
124 enum bcmgenet_power_mode mode)
125 {
126 struct net_device *dev = priv->dev;
127 struct bcmgenet_rxnfc_rule *rule;
128 u32 reg, hfb_ctrl_reg, hfb_enable = 0;
129 int retries = 0;
130
131 if (mode != GENET_POWER_WOL_MAGIC) {
132 netif_err(priv, wol, dev, "unsupported mode: %d\n", mode);
133 return -EINVAL;
134 }
135
136 /* Can't suspend with WoL if MAC is still in reset */
137 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
138 if (reg & CMD_SW_RESET)
139 reg &= ~CMD_SW_RESET;
140
141 /* disable RX */
142 reg &= ~CMD_RX_EN;
143 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
144 mdelay(10);
145
146 if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
147 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
148 reg |= MPD_EN;
149 if (priv->wolopts & WAKE_MAGICSECURE) {
150 bcmgenet_set_mpd_password(priv);
151 reg |= MPD_PW_EN;
152 }
153 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
154 }
155
156 hfb_ctrl_reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
157 if (priv->wolopts & WAKE_FILTER) {
158 list_for_each_entry(rule, &priv->rxnfc_list, list)
159 if (rule->fs.ring_cookie == RX_CLS_FLOW_WAKE)
160 hfb_enable |= (1 << rule->fs.location);
161 reg = (hfb_ctrl_reg & ~RBUF_HFB_EN) | RBUF_ACPI_EN;
162 bcmgenet_hfb_reg_writel(priv, reg, HFB_CTRL);
163 }
164
165 /* Do not leave UniMAC in MPD mode only */
166 retries = bcmgenet_poll_wol_status(priv);
167 if (retries < 0) {
168 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
169 reg &= ~(MPD_EN | MPD_PW_EN);
170 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
171 bcmgenet_hfb_reg_writel(priv, hfb_ctrl_reg, HFB_CTRL);
172 return retries;
173 }
174
175 netif_dbg(priv, wol, dev, "MPD WOL-ready status set after %d msec\n",
176 retries);
177
178 clk_prepare_enable(priv->clk_wol);
179 priv->wol_active = 1;
180
181 if (hfb_enable) {
182 bcmgenet_hfb_reg_writel(priv, hfb_enable,
183 HFB_FLT_ENABLE_V3PLUS + 4);
184 hfb_ctrl_reg = RBUF_HFB_EN | RBUF_ACPI_EN;
185 bcmgenet_hfb_reg_writel(priv, hfb_ctrl_reg, HFB_CTRL);
186 }
187
188 /* Enable CRC forward */
189 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
190 priv->crc_fwd_en = 1;
191 reg |= CMD_CRC_FWD;
192
193 /* Receiver must be enabled for WOL MP detection */
194 reg |= CMD_RX_EN;
195 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
196
197 reg = UMAC_IRQ_MPD_R;
198 if (hfb_enable)
199 reg |= UMAC_IRQ_HFB_SM | UMAC_IRQ_HFB_MM;
200
201 bcmgenet_intrl2_0_writel(priv, reg, INTRL2_CPU_MASK_CLEAR);
202
203 return 0;
204 }
205
bcmgenet_wol_power_up_cfg(struct bcmgenet_priv * priv,enum bcmgenet_power_mode mode)206 void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
207 enum bcmgenet_power_mode mode)
208 {
209 u32 reg;
210
211 if (mode != GENET_POWER_WOL_MAGIC) {
212 netif_err(priv, wol, priv->dev, "invalid mode: %d\n", mode);
213 return;
214 }
215
216 if (!priv->wol_active)
217 return; /* failed to suspend so skip the rest */
218
219 priv->wol_active = 0;
220 clk_disable_unprepare(priv->clk_wol);
221 priv->crc_fwd_en = 0;
222
223 /* Disable Magic Packet Detection */
224 if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
225 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
226 if (!(reg & MPD_EN))
227 return; /* already reset so skip the rest */
228 reg &= ~(MPD_EN | MPD_PW_EN);
229 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
230 }
231
232 /* Disable WAKE_FILTER Detection */
233 if (priv->wolopts & WAKE_FILTER) {
234 reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
235 if (!(reg & RBUF_ACPI_EN))
236 return; /* already reset so skip the rest */
237 reg &= ~(RBUF_HFB_EN | RBUF_ACPI_EN);
238 bcmgenet_hfb_reg_writel(priv, reg, HFB_CTRL);
239 }
240
241 /* Disable CRC Forward */
242 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
243 reg &= ~CMD_CRC_FWD;
244 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
245 }
246