1 /* 2 * Broadcom GENET (Gigabit Ethernet) Wake-on-LAN support 3 * 4 * Copyright (c) 2014-2017 Broadcom 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #define pr_fmt(fmt) "bcmgenet_wol: " fmt 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/sched.h> 16 #include <linux/types.h> 17 #include <linux/interrupt.h> 18 #include <linux/string.h> 19 #include <linux/init.h> 20 #include <linux/errno.h> 21 #include <linux/delay.h> 22 #include <linux/pm.h> 23 #include <linux/clk.h> 24 #include <linux/version.h> 25 #include <linux/platform_device.h> 26 #include <net/arp.h> 27 28 #include <linux/mii.h> 29 #include <linux/ethtool.h> 30 #include <linux/netdevice.h> 31 #include <linux/inetdevice.h> 32 #include <linux/etherdevice.h> 33 #include <linux/skbuff.h> 34 #include <linux/in.h> 35 #include <linux/ip.h> 36 #include <linux/ipv6.h> 37 #include <linux/phy.h> 38 39 #include "bcmgenet.h" 40 41 /* ethtool function - get WOL (Wake on LAN) settings, Only Magic Packet 42 * Detection is supported through ethtool 43 */ 44 void bcmgenet_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol) 45 { 46 struct bcmgenet_priv *priv = netdev_priv(dev); 47 u32 reg; 48 49 wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE; 50 wol->wolopts = priv->wolopts; 51 memset(wol->sopass, 0, sizeof(wol->sopass)); 52 53 if (wol->wolopts & WAKE_MAGICSECURE) { 54 reg = bcmgenet_umac_readl(priv, UMAC_MPD_PW_MS); 55 put_unaligned_be16(reg, &wol->sopass[0]); 56 reg = bcmgenet_umac_readl(priv, UMAC_MPD_PW_LS); 57 put_unaligned_be32(reg, &wol->sopass[2]); 58 } 59 } 60 61 /* ethtool function - set WOL (Wake on LAN) settings. 62 * Only for magic packet detection mode. 63 */ 64 int bcmgenet_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol) 65 { 66 struct bcmgenet_priv *priv = netdev_priv(dev); 67 struct device *kdev = &priv->pdev->dev; 68 u32 reg; 69 70 if (!device_can_wakeup(kdev)) 71 return -ENOTSUPP; 72 73 if (wol->wolopts & ~(WAKE_MAGIC | WAKE_MAGICSECURE)) 74 return -EINVAL; 75 76 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 77 if (wol->wolopts & WAKE_MAGICSECURE) { 78 bcmgenet_umac_writel(priv, get_unaligned_be16(&wol->sopass[0]), 79 UMAC_MPD_PW_MS); 80 bcmgenet_umac_writel(priv, get_unaligned_be32(&wol->sopass[2]), 81 UMAC_MPD_PW_LS); 82 reg |= MPD_PW_EN; 83 } else { 84 reg &= ~MPD_PW_EN; 85 } 86 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 87 88 /* Flag the device and relevant IRQ as wakeup capable */ 89 if (wol->wolopts) { 90 device_set_wakeup_enable(kdev, 1); 91 /* Avoid unbalanced enable_irq_wake calls */ 92 if (priv->wol_irq_disabled) 93 enable_irq_wake(priv->wol_irq); 94 priv->wol_irq_disabled = false; 95 } else { 96 device_set_wakeup_enable(kdev, 0); 97 /* Avoid unbalanced disable_irq_wake calls */ 98 if (!priv->wol_irq_disabled) 99 disable_irq_wake(priv->wol_irq); 100 priv->wol_irq_disabled = true; 101 } 102 103 priv->wolopts = wol->wolopts; 104 105 return 0; 106 } 107 108 static int bcmgenet_poll_wol_status(struct bcmgenet_priv *priv) 109 { 110 struct net_device *dev = priv->dev; 111 int retries = 0; 112 113 while (!(bcmgenet_rbuf_readl(priv, RBUF_STATUS) 114 & RBUF_STATUS_WOL)) { 115 retries++; 116 if (retries > 5) { 117 netdev_crit(dev, "polling wol mode timeout\n"); 118 return -ETIMEDOUT; 119 } 120 mdelay(1); 121 } 122 123 return retries; 124 } 125 126 int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv, 127 enum bcmgenet_power_mode mode) 128 { 129 struct net_device *dev = priv->dev; 130 int retries = 0; 131 u32 reg; 132 133 if (mode != GENET_POWER_WOL_MAGIC) { 134 netif_err(priv, wol, dev, "unsupported mode: %d\n", mode); 135 return -EINVAL; 136 } 137 138 /* disable RX */ 139 reg = bcmgenet_umac_readl(priv, UMAC_CMD); 140 reg &= ~CMD_RX_EN; 141 bcmgenet_umac_writel(priv, reg, UMAC_CMD); 142 mdelay(10); 143 144 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 145 reg |= MPD_EN; 146 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 147 148 /* Do not leave UniMAC in MPD mode only */ 149 retries = bcmgenet_poll_wol_status(priv); 150 if (retries < 0) { 151 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 152 reg &= ~MPD_EN; 153 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 154 return retries; 155 } 156 157 netif_dbg(priv, wol, dev, "MPD WOL-ready status set after %d msec\n", 158 retries); 159 160 /* Enable CRC forward */ 161 reg = bcmgenet_umac_readl(priv, UMAC_CMD); 162 priv->crc_fwd_en = 1; 163 reg |= CMD_CRC_FWD; 164 165 /* Receiver must be enabled for WOL MP detection */ 166 reg |= CMD_RX_EN; 167 bcmgenet_umac_writel(priv, reg, UMAC_CMD); 168 169 if (priv->hw_params->flags & GENET_HAS_EXT) { 170 reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT); 171 reg &= ~EXT_ENERGY_DET_MASK; 172 bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT); 173 } 174 175 return 0; 176 } 177 178 void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv, 179 enum bcmgenet_power_mode mode) 180 { 181 u32 reg; 182 183 if (mode != GENET_POWER_WOL_MAGIC) { 184 netif_err(priv, wol, priv->dev, "invalid mode: %d\n", mode); 185 return; 186 } 187 188 reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL); 189 if (!(reg & MPD_EN)) 190 return; /* already powered up so skip the rest */ 191 reg &= ~MPD_EN; 192 bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL); 193 194 /* Disable CRC Forward */ 195 reg = bcmgenet_umac_readl(priv, UMAC_CMD); 196 reg &= ~CMD_CRC_FWD; 197 bcmgenet_umac_writel(priv, reg, UMAC_CMD); 198 priv->crc_fwd_en = 0; 199 } 200