1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Broadcom GENET (Gigabit Ethernet) Wake-on-LAN support 4 * 5 * Copyright (c) 2014-2017 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 */ 41 void bcmgenet_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol) 42 { 43 struct bcmgenet_priv *priv = netdev_priv(dev); 44 u32 reg; 45 46 wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE; 47 wol->wolopts = priv->wolopts; 48 memset(wol->sopass, 0, sizeof(wol->sopass)); 49 50 if (wol->wolopts & WAKE_MAGICSECURE) { 51 reg = bcmgenet_umac_readl(priv, UMAC_MPD_PW_MS); 52 put_unaligned_be16(reg, &wol->sopass[0]); 53 reg = bcmgenet_umac_readl(priv, UMAC_MPD_PW_LS); 54 put_unaligned_be32(reg, &wol->sopass[2]); 55 } 56 } 57 58 /* ethtool function - set WOL (Wake on LAN) settings. 59 * Only for magic packet detection mode. 60 */ 61 int bcmgenet_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol) 62 { 63 struct bcmgenet_priv *priv = netdev_priv(dev); 64 struct device *kdev = &priv->pdev->dev; 65 u32 reg; 66 67 if (!device_can_wakeup(kdev)) 68 return -ENOTSUPP; 69 70 if (wol->wolopts & ~(WAKE_MAGIC | WAKE_MAGICSECURE)) 71 return -EINVAL; 72 73 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 74 if (wol->wolopts & WAKE_MAGICSECURE) { 75 bcmgenet_umac_writel(priv, get_unaligned_be16(&wol->sopass[0]), 76 UMAC_MPD_PW_MS); 77 bcmgenet_umac_writel(priv, get_unaligned_be32(&wol->sopass[2]), 78 UMAC_MPD_PW_LS); 79 reg |= MPD_PW_EN; 80 } else { 81 reg &= ~MPD_PW_EN; 82 } 83 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 84 85 /* Flag the device and relevant IRQ as wakeup capable */ 86 if (wol->wolopts) { 87 device_set_wakeup_enable(kdev, 1); 88 /* Avoid unbalanced enable_irq_wake calls */ 89 if (priv->wol_irq_disabled) 90 enable_irq_wake(priv->wol_irq); 91 priv->wol_irq_disabled = false; 92 } else { 93 device_set_wakeup_enable(kdev, 0); 94 /* Avoid unbalanced disable_irq_wake calls */ 95 if (!priv->wol_irq_disabled) 96 disable_irq_wake(priv->wol_irq); 97 priv->wol_irq_disabled = true; 98 } 99 100 priv->wolopts = wol->wolopts; 101 102 return 0; 103 } 104 105 static int bcmgenet_poll_wol_status(struct bcmgenet_priv *priv) 106 { 107 struct net_device *dev = priv->dev; 108 int retries = 0; 109 110 while (!(bcmgenet_rbuf_readl(priv, RBUF_STATUS) 111 & RBUF_STATUS_WOL)) { 112 retries++; 113 if (retries > 5) { 114 netdev_crit(dev, "polling wol mode timeout\n"); 115 return -ETIMEDOUT; 116 } 117 mdelay(1); 118 } 119 120 return retries; 121 } 122 123 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 int retries = 0; 128 u32 reg; 129 130 if (mode != GENET_POWER_WOL_MAGIC) { 131 netif_err(priv, wol, dev, "unsupported mode: %d\n", mode); 132 return -EINVAL; 133 } 134 135 /* disable RX */ 136 reg = bcmgenet_umac_readl(priv, UMAC_CMD); 137 reg &= ~CMD_RX_EN; 138 bcmgenet_umac_writel(priv, reg, UMAC_CMD); 139 mdelay(10); 140 141 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 142 reg |= MPD_EN; 143 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 144 145 /* Do not leave UniMAC in MPD mode only */ 146 retries = bcmgenet_poll_wol_status(priv); 147 if (retries < 0) { 148 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 149 reg &= ~MPD_EN; 150 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 151 return retries; 152 } 153 154 netif_dbg(priv, wol, dev, "MPD WOL-ready status set after %d msec\n", 155 retries); 156 157 /* Enable CRC forward */ 158 reg = bcmgenet_umac_readl(priv, UMAC_CMD); 159 priv->crc_fwd_en = 1; 160 reg |= CMD_CRC_FWD; 161 162 /* Receiver must be enabled for WOL MP detection */ 163 reg |= CMD_RX_EN; 164 bcmgenet_umac_writel(priv, reg, UMAC_CMD); 165 166 if (priv->hw_params->flags & GENET_HAS_EXT) { 167 reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT); 168 reg &= ~EXT_ENERGY_DET_MASK; 169 bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT); 170 } 171 172 return 0; 173 } 174 175 void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv, 176 enum bcmgenet_power_mode mode) 177 { 178 u32 reg; 179 180 if (mode != GENET_POWER_WOL_MAGIC) { 181 netif_err(priv, wol, priv->dev, "invalid mode: %d\n", mode); 182 return; 183 } 184 185 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 186 if (!(reg & MPD_EN)) 187 return; /* already powered up so skip the rest */ 188 reg &= ~MPD_EN; 189 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 190 191 /* Disable CRC Forward */ 192 reg = bcmgenet_umac_readl(priv, UMAC_CMD); 193 reg &= ~CMD_CRC_FWD; 194 bcmgenet_umac_writel(priv, reg, UMAC_CMD); 195 priv->crc_fwd_en = 0; 196 } 197