bcmgenet_wol.c
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/*
* Broadcom GENET (Gigabit Ethernet) Wake-on-LAN support
*
* Copyright (c) 2014 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) "bcmgenet_wol: " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/clk.h>
#include <linux/version.h>
#include <linux/platform_device.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/phy.h>
#include "bcmgenet.h"
/* ethtool function - get WOL (Wake on LAN) settings, Only Magic Packet
* Detection is supported through ethtool
*/
void bcmgenet_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
struct bcmgenet_priv *priv = netdev_priv(dev);
u32 reg;
wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE;
wol->wolopts = priv->wolopts;
memset(wol->sopass, 0, sizeof(wol->sopass));
if (wol->wolopts & WAKE_MAGICSECURE) {
reg = bcmgenet_umac_readl(priv, UMAC_MPD_PW_MS);
put_unaligned_be16(reg, &wol->sopass[0]);
reg = bcmgenet_umac_readl(priv, UMAC_MPD_PW_LS);
put_unaligned_be32(reg, &wol->sopass[2]);
}
}
/* ethtool function - set WOL (Wake on LAN) settings.
* Only for magic packet detection mode.
*/
int bcmgenet_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
struct bcmgenet_priv *priv = netdev_priv(dev);
struct device *kdev = &priv->pdev->dev;
u32 reg;
if (!device_can_wakeup(kdev))
return -ENOTSUPP;
if (wol->wolopts & ~(WAKE_MAGIC | WAKE_MAGICSECURE))
return -EINVAL;
reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
if (wol->wolopts & WAKE_MAGICSECURE) {
bcmgenet_umac_writel(priv, get_unaligned_be16(&wol->sopass[0]),
UMAC_MPD_PW_MS);
bcmgenet_umac_writel(priv, get_unaligned_be32(&wol->sopass[2]),
UMAC_MPD_PW_LS);
reg |= MPD_PW_EN;
} else {
reg &= ~MPD_PW_EN;
}
bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
/* Flag the device and relevant IRQ as wakeup capable */
if (wol->wolopts) {
device_set_wakeup_enable(kdev, 1);
/* Avoid unbalanced enable_irq_wake calls */
if (priv->wol_irq_disabled)
enable_irq_wake(priv->wol_irq);
priv->wol_irq_disabled = false;
} else {
device_set_wakeup_enable(kdev, 0);
/* Avoid unbalanced disable_irq_wake calls */
if (!priv->wol_irq_disabled)
disable_irq_wake(priv->wol_irq);
priv->wol_irq_disabled = true;
}
priv->wolopts = wol->wolopts;
return 0;
}
static int bcmgenet_poll_wol_status(struct bcmgenet_priv *priv)
{
struct net_device *dev = priv->dev;
int retries = 0;
while (!(bcmgenet_rbuf_readl(priv, RBUF_STATUS)
& RBUF_STATUS_WOL)) {
retries++;
if (retries > 5) {
netdev_crit(dev, "polling wol mode timeout\n");
return -ETIMEDOUT;
}
mdelay(1);
}
return retries;
}
int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
enum bcmgenet_power_mode mode)
{
struct net_device *dev = priv->dev;
u32 cpu_mask_clear;
int retries = 0;
u32 reg;
if (mode != GENET_POWER_WOL_MAGIC) {
netif_err(priv, wol, dev, "unsupported mode: %d\n", mode);
return -EINVAL;
}
/* disable RX */
reg = bcmgenet_umac_readl(priv, UMAC_CMD);
reg &= ~CMD_RX_EN;
bcmgenet_umac_writel(priv, reg, UMAC_CMD);
mdelay(10);
reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
reg |= MPD_EN;
bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
/* Do not leave UniMAC in MPD mode only */
retries = bcmgenet_poll_wol_status(priv);
if (retries < 0) {
reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
reg &= ~MPD_EN;
bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
return retries;
}
netif_dbg(priv, wol, dev, "MPD WOL-ready status set after %d msec\n",
retries);
/* Enable CRC forward */
reg = bcmgenet_umac_readl(priv, UMAC_CMD);
priv->crc_fwd_en = 1;
reg |= CMD_CRC_FWD;
/* Receiver must be enabled for WOL MP detection */
reg |= CMD_RX_EN;
bcmgenet_umac_writel(priv, reg, UMAC_CMD);
if (priv->hw_params->flags & GENET_HAS_EXT) {
reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
reg &= ~EXT_ENERGY_DET_MASK;
bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
}
/* Enable the MPD interrupt */
cpu_mask_clear = UMAC_IRQ_MPD_R;
bcmgenet_intrl2_0_writel(priv, cpu_mask_clear, INTRL2_CPU_MASK_CLEAR);
return 0;
}
void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
enum bcmgenet_power_mode mode)
{
u32 cpu_mask_set;
u32 reg;
if (mode != GENET_POWER_WOL_MAGIC) {
netif_err(priv, wol, priv->dev, "invalid mode: %d\n", mode);
return;
}
reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
reg &= ~MPD_EN;
bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
/* Disable CRC Forward */
reg = bcmgenet_umac_readl(priv, UMAC_CMD);
reg &= ~CMD_CRC_FWD;
bcmgenet_umac_writel(priv, reg, UMAC_CMD);
priv->crc_fwd_en = 0;
/* Stop monitoring magic packet IRQ */
cpu_mask_set = UMAC_IRQ_MPD_R;
/* Stop monitoring magic packet IRQ */
bcmgenet_intrl2_0_writel(priv, cpu_mask_set, INTRL2_CPU_MASK_SET);
}