diff options
Diffstat (limited to 'drivers/net/usb/smsc95xx.c')
| -rw-r--r-- | drivers/net/usb/smsc95xx.c | 151 |
1 files changed, 150 insertions, 1 deletions
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index 124e67f7eed3..6a74a68220be 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -55,6 +55,13 @@ #define FEATURE_PHY_NLP_CROSSOVER (0x02) #define FEATURE_AUTOSUSPEND (0x04) +#define SUSPEND_SUSPEND0 (0x01) +#define SUSPEND_SUSPEND1 (0x02) +#define SUSPEND_SUSPEND2 (0x04) +#define SUSPEND_SUSPEND3 (0x08) +#define SUSPEND_ALLMODES (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \ + SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3) + struct smsc95xx_priv { u32 mac_cr; u32 hash_hi; @@ -62,6 +69,7 @@ struct smsc95xx_priv { u32 wolopts; spinlock_t mac_cr_lock; u8 features; + u8 suspend_flags; }; static bool turbo_mode = true; @@ -1242,6 +1250,8 @@ static int smsc95xx_enter_suspend0(struct usbnet *dev) /* read back PM_CTRL */ ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); + pdata->suspend_flags |= SUSPEND_SUSPEND0; + return ret; } @@ -1286,11 +1296,14 @@ static int smsc95xx_enter_suspend1(struct usbnet *dev) ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); + pdata->suspend_flags |= SUSPEND_SUSPEND1; + return ret; } static int smsc95xx_enter_suspend2(struct usbnet *dev) { + struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]); u32 val; int ret; @@ -1303,9 +1316,97 @@ static int smsc95xx_enter_suspend2(struct usbnet *dev) ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); + pdata->suspend_flags |= SUSPEND_SUSPEND2; + return ret; } +static int smsc95xx_enter_suspend3(struct usbnet *dev) +{ + struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]); + u32 val; + int ret; + + ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val); + if (ret < 0) + return ret; + + if (val & 0xFFFF) { + netdev_info(dev->net, "rx fifo not empty in autosuspend\n"); + return -EBUSY; + } + + ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val); + if (ret < 0) + return ret; + + val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_); + val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS; + + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); + if (ret < 0) + return ret; + + /* clear wol status */ + val &= ~PM_CTL_WUPS_; + val |= PM_CTL_WUPS_WOL_; + + ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val); + if (ret < 0) + return ret; + + pdata->suspend_flags |= SUSPEND_SUSPEND3; + + return 0; +} + +static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up) +{ + struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]); + int ret; + + if (!netif_running(dev->net)) { + /* interface is ifconfig down so fully power down hw */ + netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n"); + return smsc95xx_enter_suspend2(dev); + } + + if (!link_up) { + /* link is down so enter EDPD mode, but only if device can + * reliably resume from it. This check should be redundant + * as current FEATURE_AUTOSUSPEND parts also support + * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */ + if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) { + netdev_warn(dev->net, "EDPD not supported\n"); + return -EBUSY; + } + + netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n"); + + /* enable PHY wakeup events for if cable is attached */ + ret = smsc95xx_enable_phy_wakeup_interrupts(dev, + PHY_INT_MASK_ANEG_COMP_); + if (ret < 0) { + netdev_warn(dev->net, "error enabling PHY wakeup ints\n"); + return ret; + } + + netdev_info(dev->net, "entering SUSPEND1 mode\n"); + return smsc95xx_enter_suspend1(dev); + } + + /* enable PHY wakeup events so we remote wakeup if cable is pulled */ + ret = smsc95xx_enable_phy_wakeup_interrupts(dev, + PHY_INT_MASK_LINK_DOWN_); + if (ret < 0) { + netdev_warn(dev->net, "error enabling PHY wakeup ints\n"); + return ret; + } + + netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n"); + return smsc95xx_enter_suspend3(dev); +} + static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message) { struct usbnet *dev = usb_get_intfdata(intf); @@ -1313,15 +1414,35 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message) u32 val, link_up; int ret; + /* TODO: don't indicate this feature to usb framework if + * our current hardware doesn't have the capability + */ + if ((message.event == PM_EVENT_AUTO_SUSPEND) && + (!(pdata->features & FEATURE_AUTOSUSPEND))) { + netdev_warn(dev->net, "autosuspend not supported\n"); + return -EBUSY; + } + ret = usbnet_suspend(intf, message); if (ret < 0) { netdev_warn(dev->net, "usbnet_suspend error\n"); return ret; } + if (pdata->suspend_flags) { + netdev_warn(dev->net, "error during last resume\n"); + pdata->suspend_flags = 0; + } + /* determine if link is up using only _nopm functions */ link_up = smsc95xx_link_ok_nopm(dev); + if (message.event == PM_EVENT_AUTO_SUSPEND) { + ret = smsc95xx_autosuspend(dev, link_up); + goto done; + } + + /* if we get this far we're not autosuspending */ /* if no wol options set, or if link is down and we're not waking on * PHY activity, enter lowest power SUSPEND2 mode */ @@ -1552,12 +1673,18 @@ static int smsc95xx_resume(struct usb_interface *intf) { struct usbnet *dev = usb_get_intfdata(intf); struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]); + u8 suspend_flags = pdata->suspend_flags; int ret; u32 val; BUG_ON(!dev); - if (pdata->wolopts) { + netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags); + + /* do this first to ensure it's cleared even in error case */ + pdata->suspend_flags = 0; + + if (suspend_flags & SUSPEND_ALLMODES) { /* clear wake-up sources */ ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val); if (ret < 0) @@ -1741,6 +1868,26 @@ static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev, return skb; } +static int smsc95xx_manage_power(struct usbnet *dev, int on) +{ + struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]); + + dev->intf->needs_remote_wakeup = on; + + if (pdata->features & FEATURE_AUTOSUSPEND) + return 0; + + /* this chip revision doesn't support autosuspend */ + netdev_info(dev->net, "hardware doesn't support USB autosuspend\n"); + + if (on) + usb_autopm_get_interface_no_resume(dev->intf); + else + usb_autopm_put_interface(dev->intf); + + return 0; +} + static const struct driver_info smsc95xx_info = { .description = "smsc95xx USB 2.0 Ethernet", .bind = smsc95xx_bind, @@ -1750,6 +1897,7 @@ static const struct driver_info smsc95xx_info = { .rx_fixup = smsc95xx_rx_fixup, .tx_fixup = smsc95xx_tx_fixup, .status = smsc95xx_status, + .manage_power = smsc95xx_manage_power, .flags = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR, }; @@ -1857,6 +2005,7 @@ static struct usb_driver smsc95xx_driver = { .reset_resume = smsc95xx_resume, .disconnect = usbnet_disconnect, .disable_hub_initiated_lpm = 1, + .supports_autosuspend = 1, }; module_usb_driver(smsc95xx_driver); |