249 lines
6.3 KiB
C
249 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Broadcom GENET (Gigabit Ethernet) Wake-on-LAN support
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*
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* Copyright (c) 2014-2020 Broadcom
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*/
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#define pr_fmt(fmt) "bcmgenet_wol: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <net/arp.h>
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#include <linux/mii.h>
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#include <linux/ethtool.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/phy.h>
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#include "bcmgenet.h"
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/* ethtool function - get WOL (Wake on LAN) settings, Only Magic Packet
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* Detection is supported through ethtool
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*/
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void bcmgenet_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
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{
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struct bcmgenet_priv *priv = netdev_priv(dev);
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struct device *kdev = &priv->pdev->dev;
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if (!device_can_wakeup(kdev)) {
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wol->supported = 0;
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wol->wolopts = 0;
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return;
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}
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wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER;
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wol->wolopts = priv->wolopts;
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memset(wol->sopass, 0, sizeof(wol->sopass));
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if (wol->wolopts & WAKE_MAGICSECURE)
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memcpy(wol->sopass, priv->sopass, sizeof(priv->sopass));
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}
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/* ethtool function - set WOL (Wake on LAN) settings.
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* Only for magic packet detection mode.
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*/
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int bcmgenet_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
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{
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struct bcmgenet_priv *priv = netdev_priv(dev);
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struct device *kdev = &priv->pdev->dev;
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if (!device_can_wakeup(kdev))
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return -ENOTSUPP;
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if (wol->wolopts & ~(WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER))
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return -EINVAL;
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if (wol->wolopts & WAKE_MAGICSECURE)
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memcpy(priv->sopass, wol->sopass, sizeof(priv->sopass));
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/* Flag the device and relevant IRQ as wakeup capable */
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if (wol->wolopts) {
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device_set_wakeup_enable(kdev, 1);
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/* Avoid unbalanced enable_irq_wake calls */
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if (priv->wol_irq_disabled) {
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enable_irq_wake(priv->wol_irq);
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enable_irq_wake(priv->irq0);
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}
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priv->wol_irq_disabled = false;
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} else {
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device_set_wakeup_enable(kdev, 0);
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/* Avoid unbalanced disable_irq_wake calls */
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if (!priv->wol_irq_disabled) {
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disable_irq_wake(priv->wol_irq);
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disable_irq_wake(priv->irq0);
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}
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priv->wol_irq_disabled = true;
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}
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priv->wolopts = wol->wolopts;
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return 0;
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}
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static int bcmgenet_poll_wol_status(struct bcmgenet_priv *priv)
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{
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struct net_device *dev = priv->dev;
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int retries = 0;
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while (!(bcmgenet_rbuf_readl(priv, RBUF_STATUS)
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& RBUF_STATUS_WOL)) {
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retries++;
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if (retries > 5) {
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netdev_crit(dev, "polling wol mode timeout\n");
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return -ETIMEDOUT;
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}
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mdelay(1);
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}
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return retries;
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}
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static void bcmgenet_set_mpd_password(struct bcmgenet_priv *priv)
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{
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bcmgenet_umac_writel(priv, get_unaligned_be16(&priv->sopass[0]),
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UMAC_MPD_PW_MS);
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bcmgenet_umac_writel(priv, get_unaligned_be32(&priv->sopass[2]),
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UMAC_MPD_PW_LS);
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}
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int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
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enum bcmgenet_power_mode mode)
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{
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struct net_device *dev = priv->dev;
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struct bcmgenet_rxnfc_rule *rule;
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u32 reg, hfb_ctrl_reg, hfb_enable = 0;
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int retries = 0;
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if (mode != GENET_POWER_WOL_MAGIC) {
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netif_err(priv, wol, dev, "unsupported mode: %d\n", mode);
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return -EINVAL;
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}
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/* Can't suspend with WoL if MAC is still in reset */
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reg = bcmgenet_umac_readl(priv, UMAC_CMD);
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if (reg & CMD_SW_RESET)
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reg &= ~CMD_SW_RESET;
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/* disable RX */
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reg &= ~CMD_RX_EN;
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bcmgenet_umac_writel(priv, reg, UMAC_CMD);
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mdelay(10);
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if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
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reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
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reg |= MPD_EN;
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if (priv->wolopts & WAKE_MAGICSECURE) {
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bcmgenet_set_mpd_password(priv);
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reg |= MPD_PW_EN;
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}
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bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
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}
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hfb_ctrl_reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
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if (priv->wolopts & WAKE_FILTER) {
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list_for_each_entry(rule, &priv->rxnfc_list, list)
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if (rule->fs.ring_cookie == RX_CLS_FLOW_WAKE)
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hfb_enable |= (1 << rule->fs.location);
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reg = (hfb_ctrl_reg & ~RBUF_HFB_EN) | RBUF_ACPI_EN;
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bcmgenet_hfb_reg_writel(priv, reg, HFB_CTRL);
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}
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/* Do not leave UniMAC in MPD mode only */
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retries = bcmgenet_poll_wol_status(priv);
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if (retries < 0) {
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reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
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reg &= ~(MPD_EN | MPD_PW_EN);
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bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
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bcmgenet_hfb_reg_writel(priv, hfb_ctrl_reg, HFB_CTRL);
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return retries;
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}
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netif_dbg(priv, wol, dev, "MPD WOL-ready status set after %d msec\n",
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retries);
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clk_prepare_enable(priv->clk_wol);
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priv->wol_active = 1;
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if (hfb_enable) {
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bcmgenet_hfb_reg_writel(priv, hfb_enable,
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HFB_FLT_ENABLE_V3PLUS + 4);
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hfb_ctrl_reg = RBUF_HFB_EN | RBUF_ACPI_EN;
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bcmgenet_hfb_reg_writel(priv, hfb_ctrl_reg, HFB_CTRL);
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}
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/* Enable CRC forward */
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reg = bcmgenet_umac_readl(priv, UMAC_CMD);
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priv->crc_fwd_en = 1;
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reg |= CMD_CRC_FWD;
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/* Receiver must be enabled for WOL MP detection */
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reg |= CMD_RX_EN;
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bcmgenet_umac_writel(priv, reg, UMAC_CMD);
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reg = UMAC_IRQ_MPD_R;
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if (hfb_enable)
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reg |= UMAC_IRQ_HFB_SM | UMAC_IRQ_HFB_MM;
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bcmgenet_intrl2_0_writel(priv, reg, INTRL2_CPU_MASK_CLEAR);
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return 0;
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}
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void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
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enum bcmgenet_power_mode mode)
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{
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u32 reg;
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if (mode != GENET_POWER_WOL_MAGIC) {
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netif_err(priv, wol, priv->dev, "invalid mode: %d\n", mode);
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return;
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}
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if (!priv->wol_active)
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return; /* failed to suspend so skip the rest */
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priv->wol_active = 0;
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clk_disable_unprepare(priv->clk_wol);
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priv->crc_fwd_en = 0;
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/* Disable Magic Packet Detection */
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if (priv->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
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reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
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if (!(reg & MPD_EN))
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return; /* already reset so skip the rest */
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reg &= ~(MPD_EN | MPD_PW_EN);
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bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
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}
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/* Disable WAKE_FILTER Detection */
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if (priv->wolopts & WAKE_FILTER) {
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reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
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if (!(reg & RBUF_ACPI_EN))
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return; /* already reset so skip the rest */
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reg &= ~(RBUF_HFB_EN | RBUF_ACPI_EN);
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bcmgenet_hfb_reg_writel(priv, reg, HFB_CTRL);
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}
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/* Disable CRC Forward */
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reg = bcmgenet_umac_readl(priv, UMAC_CMD);
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reg &= ~CMD_CRC_FWD;
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bcmgenet_umac_writel(priv, reg, UMAC_CMD);
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}
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