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206 lines
7.0 KiB
Diff
206 lines
7.0 KiB
Diff
From f1c0db40a3ade1f1a39e5794d728f2953d817322 Mon Sep 17 00:00:00 2001
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From: Al Cooper <alcooperx@gmail.com>
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Date: Fri, 3 Jan 2020 13:18:02 -0500
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Subject: [PATCH] phy: usb: Add "wake on" functionality
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Add the ability to handle USB wake events from USB devices when
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in S2 mode. Typically there is some additional configuration
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needed to tell the USB device to generate the wake event when
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suspended but this varies with the different USB device classes.
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For example, on USB Ethernet dongles, ethtool should be used to
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enable the magic packet wake functionality in the dongle.
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NOTE: This requires that the "power/wakeup" sysfs entry for
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the USB device generating the wakeup be set to "enabled".
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This functionality requires a special hardware sideband path that
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will trigger the AON_PM_L2 interrupt needed to wake the system from
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S2 even though the USB host controllers are in IDDQ (low power state)
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and most USB related clocks are shut off. For the sideband signaling
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to work we need to leave the usbx_freerun clock running, but this
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clock consumes very little power by design. There's a bug in the
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XHCI wake hardware so only EHCI/OHCI wake is currently supported.
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Signed-off-by: Al Cooper <alcooperx@gmail.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
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---
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drivers/phy/broadcom/phy-brcm-usb-init.c | 17 +++++++++
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drivers/phy/broadcom/phy-brcm-usb-init.h | 1 +
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drivers/phy/broadcom/phy-brcm-usb.c | 48 ++++++++++++++++++++++--
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3 files changed, 63 insertions(+), 3 deletions(-)
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--- a/drivers/phy/broadcom/phy-brcm-usb-init.c
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+++ b/drivers/phy/broadcom/phy-brcm-usb-init.c
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@@ -58,6 +58,8 @@
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#define USB_CTRL_USB_PM_SOFT_RESET_MASK 0x40000000 /* option */
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#define USB_CTRL_USB_PM_USB20_HC_RESETB_MASK 0x30000000 /* option */
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#define USB_CTRL_USB_PM_USB20_HC_RESETB_VAR_MASK 0x00300000 /* option */
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+#define USB_CTRL_USB_PM_RMTWKUP_EN_MASK 0x00000001
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+#define USB_CTRL_USB_PM_STATUS 0x38
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#define USB_CTRL_USB30_CTL1 0x60
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#define USB_CTRL_USB30_CTL1_PHY3_PLL_SEQ_START_MASK 0x00000010
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#define USB_CTRL_USB30_CTL1_PHY3_RESETB_MASK 0x00010000
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@@ -855,6 +857,10 @@ void brcm_usb_init_common(struct brcm_us
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u32 reg;
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void __iomem *ctrl = params->ctrl_regs;
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+ /* Clear any pending wake conditions */
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+ reg = brcmusb_readl(USB_CTRL_REG(ctrl, USB_PM_STATUS));
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+ brcmusb_writel(reg, USB_CTRL_REG(ctrl, USB_PM_STATUS));
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+
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/* Take USB out of power down */
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if (USB_CTRL_MASK_FAMILY(params, PLL_CTL, PLL_IDDQ_PWRDN)) {
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USB_CTRL_UNSET_FAMILY(params, PLL_CTL, PLL_IDDQ_PWRDN);
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@@ -1010,6 +1016,17 @@ void brcm_usb_uninit_xhci(struct brcm_us
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USB_CTRL_SET(params->ctrl_regs, USB30_PCTL, PHY3_IDDQ_OVERRIDE);
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}
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+void brcm_usb_wake_enable(struct brcm_usb_init_params *params,
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+ int enable)
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+{
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+ void __iomem *ctrl = params->ctrl_regs;
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+
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+ if (enable)
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+ USB_CTRL_SET(ctrl, USB_PM, RMTWKUP_EN);
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+ else
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+ USB_CTRL_UNSET(ctrl, USB_PM, RMTWKUP_EN);
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+}
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+
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void brcm_usb_set_family_map(struct brcm_usb_init_params *params)
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{
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int fam;
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--- a/drivers/phy/broadcom/phy-brcm-usb-init.h
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+++ b/drivers/phy/broadcom/phy-brcm-usb-init.h
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@@ -38,5 +38,6 @@ void brcm_usb_init_xhci(struct brcm_usb_
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void brcm_usb_uninit_common(struct brcm_usb_init_params *ini);
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void brcm_usb_uninit_eohci(struct brcm_usb_init_params *ini);
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void brcm_usb_uninit_xhci(struct brcm_usb_init_params *ini);
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+void brcm_usb_wake_enable(struct brcm_usb_init_params *params, int enable);
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#endif /* _USB_BRCM_COMMON_INIT_H */
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--- a/drivers/phy/broadcom/phy-brcm-usb.c
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+++ b/drivers/phy/broadcom/phy-brcm-usb.c
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@@ -57,11 +57,22 @@ struct brcm_usb_phy_data {
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bool has_xhci;
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struct clk *usb_20_clk;
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struct clk *usb_30_clk;
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+ struct clk *suspend_clk;
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struct mutex mutex; /* serialize phy init */
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int init_count;
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+ int wake_irq;
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struct brcm_usb_phy phys[BRCM_USB_PHY_ID_MAX];
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};
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+static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id)
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+{
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+ struct phy *gphy = dev_id;
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+
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+ pm_wakeup_event(&gphy->dev, 0);
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+
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+ return IRQ_HANDLED;
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+}
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+
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static int brcm_usb_phy_init(struct phy *gphy)
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{
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struct brcm_usb_phy *phy = phy_get_drvdata(gphy);
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@@ -76,6 +87,7 @@ static int brcm_usb_phy_init(struct phy
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if (priv->init_count++ == 0) {
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clk_prepare_enable(priv->usb_20_clk);
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clk_prepare_enable(priv->usb_30_clk);
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+ clk_prepare_enable(priv->suspend_clk);
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brcm_usb_init_common(&priv->ini);
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}
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mutex_unlock(&priv->mutex);
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@@ -108,6 +120,7 @@ static int brcm_usb_phy_exit(struct phy
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brcm_usb_uninit_common(&priv->ini);
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clk_disable_unprepare(priv->usb_20_clk);
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clk_disable_unprepare(priv->usb_30_clk);
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+ clk_disable_unprepare(priv->suspend_clk);
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}
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mutex_unlock(&priv->mutex);
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phy->inited = false;
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@@ -228,11 +241,12 @@ static const struct attribute_group brcm
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.attrs = brcm_usb_phy_attrs,
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};
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-static int brcm_usb_phy_dvr_init(struct device *dev,
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+static int brcm_usb_phy_dvr_init(struct platform_device *pdev,
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struct brcm_usb_phy_data *priv,
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struct device_node *dn)
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{
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- struct phy *gphy;
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+ struct device *dev = &pdev->dev;
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+ struct phy *gphy = NULL;
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int err;
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priv->usb_20_clk = of_clk_get_by_name(dn, "sw_usb");
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@@ -275,6 +289,28 @@ static int brcm_usb_phy_dvr_init(struct
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if (err)
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return err;
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}
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+
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+ priv->suspend_clk = clk_get(dev, "usb0_freerun");
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+ if (IS_ERR(priv->suspend_clk)) {
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+ dev_err(dev, "Suspend Clock not found in Device Tree\n");
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+ priv->suspend_clk = NULL;
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+ }
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+
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+ priv->wake_irq = platform_get_irq_byname(pdev, "wake");
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+ if (priv->wake_irq < 0)
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+ priv->wake_irq = platform_get_irq_byname(pdev, "wakeup");
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+ if (priv->wake_irq >= 0) {
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+ err = devm_request_irq(dev, priv->wake_irq,
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+ brcm_usb_phy_wake_isr, 0,
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+ dev_name(dev), gphy);
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+ if (err < 0)
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+ return err;
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+ device_set_wakeup_capable(dev, 1);
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+ } else {
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+ dev_info(dev,
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+ "Wake interrupt missing, system wake not supported\n");
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+ }
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+
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return 0;
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}
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@@ -335,7 +371,7 @@ static int brcm_usb_phy_probe(struct pla
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if (of_property_read_bool(dn, "brcm,has-eohci"))
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priv->has_eohci = true;
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- err = brcm_usb_phy_dvr_init(dev, priv, dn);
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+ err = brcm_usb_phy_dvr_init(pdev, priv, dn);
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if (err)
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return err;
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@@ -386,10 +422,13 @@ static int brcm_usb_phy_suspend(struct d
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if (priv->phys[BRCM_USB_PHY_2_0].inited)
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brcm_usb_uninit_eohci(&priv->ini);
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brcm_usb_uninit_common(&priv->ini);
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+ brcm_usb_wake_enable(&priv->ini, true);
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if (priv->phys[BRCM_USB_PHY_3_0].inited)
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clk_disable_unprepare(priv->usb_30_clk);
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if (priv->phys[BRCM_USB_PHY_2_0].inited)
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clk_disable_unprepare(priv->usb_20_clk);
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+ if (priv->wake_irq >= 0)
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+ enable_irq_wake(priv->wake_irq);
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}
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return 0;
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}
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@@ -400,6 +439,7 @@ static int brcm_usb_phy_resume(struct de
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clk_prepare_enable(priv->usb_20_clk);
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clk_prepare_enable(priv->usb_30_clk);
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+ brcm_usb_wake_enable(&priv->ini, false);
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brcm_usb_init_ipp(&priv->ini);
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/*
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@@ -407,6 +447,8 @@ static int brcm_usb_phy_resume(struct de
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* Uninitialize anything that wasn't previously initialized.
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*/
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if (priv->init_count) {
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+ if (priv->wake_irq >= 0)
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+ disable_irq_wake(priv->wake_irq);
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brcm_usb_init_common(&priv->ini);
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if (priv->phys[BRCM_USB_PHY_2_0].inited) {
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brcm_usb_init_eohci(&priv->ini);
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