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Thu, 07 Nov 2019 06:14:35 -0800 (PST) From: Al Cooper To: linux-kernel@vger.kernel.org Subject: [PATCH 04/13] phy: usb: Add "wake on" functionality Date: Thu, 7 Nov 2019 09:13:30 -0500 Message-Id: <20191107141339.6079-5-alcooperx@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191107141339.6079-1-alcooperx@gmail.com> References: <20191107141339.6079-1-alcooperx@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191107_061438_472810_42EE31A8 X-CRM114-Status: GOOD ( 21.25 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:442 listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (alcooperx[at]gmail.com) -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Florian Fainelli , Al Cooper , Kishon Vijay Abraham I , Rob Herring , bcm-kernel-feedback-list@broadcom.com, Srinath Mannam , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add the ability to handle USB wake events from USB devices when in S2 mode. Typically there is some additional configuration needed to tell the USB device to generate the wake event when suspended but this varies with the different USB device classes. For example, on USB Ethernet dongles, ethtool should be used to enable the magic packet wake functionality in the dongle. NOTE: This requires that the "power/wakeup" sysfs entry for the USB device generating the wakeup be set to "enabled". This functionality requires a special hardware sideband path that will trigger the AON_PM_L2 interrupt needed to wake the system from S2 even though the USB host controllers are in IDDQ (low power state) and most USB related clocks are shut off. For the sideband signaling to work we need to leave the usbx_freerun clock running, but this clock consumes very little power by design. There's a bug in the XHCI wake hardware so only EHCI/OHCI wake is currently supported. Signed-off-by: Al Cooper --- drivers/phy/broadcom/phy-brcm-usb-init.c | 17 +++++++++ drivers/phy/broadcom/phy-brcm-usb-init.h | 1 + drivers/phy/broadcom/phy-brcm-usb.c | 46 ++++++++++++++++++++++-- 3 files changed, 61 insertions(+), 3 deletions(-) diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.c b/drivers/phy/broadcom/phy-brcm-usb-init.c index 0e6b921072be..6ad5978ded9b 100644 --- a/drivers/phy/broadcom/phy-brcm-usb-init.c +++ b/drivers/phy/broadcom/phy-brcm-usb-init.c @@ -58,6 +58,8 @@ #define USB_CTRL_USB_PM_SOFT_RESET_MASK 0x40000000 /* option */ #define USB_CTRL_USB_PM_USB20_HC_RESETB_MASK 0x30000000 /* option */ #define USB_CTRL_USB_PM_USB20_HC_RESETB_VAR_MASK 0x00300000 /* option */ +#define USB_CTRL_USB_PM_RMTWKUP_EN_MASK 0x00000001 +#define USB_CTRL_USB_PM_STATUS 0x38 #define USB_CTRL_USB30_CTL1 0x60 #define USB_CTRL_USB30_CTL1_PHY3_PLL_SEQ_START_MASK 0x00000010 #define USB_CTRL_USB30_CTL1_PHY3_RESETB_MASK 0x00010000 @@ -855,6 +857,10 @@ void brcm_usb_init_common(struct brcm_usb_init_params *params) u32 reg; void __iomem *ctrl = params->ctrl_regs; + /* Clear any pending wake conditions */ + reg = brcmusb_readl(USB_CTRL_REG(ctrl, USB_PM_STATUS)); + brcmusb_writel(reg, USB_CTRL_REG(ctrl, USB_PM_STATUS)); + /* Take USB out of power down */ if (USB_CTRL_MASK_FAMILY(params, PLL_CTL, PLL_IDDQ_PWRDN)) { USB_CTRL_UNSET_FAMILY(params, PLL_CTL, PLL_IDDQ_PWRDN); @@ -1010,6 +1016,17 @@ void brcm_usb_uninit_xhci(struct brcm_usb_init_params *params) USB_CTRL_SET(params->ctrl_regs, USB30_PCTL, PHY3_IDDQ_OVERRIDE); } +void brcm_usb_wake_enable(struct brcm_usb_init_params *params, + int enable) +{ + void __iomem *ctrl = params->ctrl_regs; + + if (enable) + USB_CTRL_SET(ctrl, USB_PM, RMTWKUP_EN); + else + USB_CTRL_UNSET(ctrl, USB_PM, RMTWKUP_EN); +} + void brcm_usb_set_family_map(struct brcm_usb_init_params *params) { int fam; diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.h b/drivers/phy/broadcom/phy-brcm-usb-init.h index f4f4f6d5d258..f473e0c51f0b 100644 --- a/drivers/phy/broadcom/phy-brcm-usb-init.h +++ b/drivers/phy/broadcom/phy-brcm-usb-init.h @@ -38,5 +38,6 @@ void brcm_usb_init_xhci(struct brcm_usb_init_params *ini); void brcm_usb_uninit_common(struct brcm_usb_init_params *ini); void brcm_usb_uninit_eohci(struct brcm_usb_init_params *ini); void brcm_usb_uninit_xhci(struct brcm_usb_init_params *ini); +void brcm_usb_wake_enable(struct brcm_usb_init_params *params, int enable); #endif /* _USB_BRCM_COMMON_INIT_H */ diff --git a/drivers/phy/broadcom/phy-brcm-usb.c b/drivers/phy/broadcom/phy-brcm-usb.c index 634afc803778..7b74d11b7e58 100644 --- a/drivers/phy/broadcom/phy-brcm-usb.c +++ b/drivers/phy/broadcom/phy-brcm-usb.c @@ -57,11 +57,22 @@ struct brcm_usb_phy_data { bool has_xhci; struct clk *usb_20_clk; struct clk *usb_30_clk; + struct clk *suspend_clk; struct mutex mutex; /* serialize phy init */ int init_count; + int wake_irq; struct brcm_usb_phy phys[BRCM_USB_PHY_ID_MAX]; }; +static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id) +{ + struct phy *gphy = dev_id; + + pm_wakeup_event(&gphy->dev, 0); + + return IRQ_HANDLED; +} + static int brcm_usb_phy_init(struct phy *gphy) { struct brcm_usb_phy *phy = phy_get_drvdata(gphy); @@ -76,6 +87,7 @@ static int brcm_usb_phy_init(struct phy *gphy) if (priv->init_count++ == 0) { clk_prepare_enable(priv->usb_20_clk); clk_prepare_enable(priv->usb_30_clk); + clk_prepare_enable(priv->suspend_clk); brcm_usb_init_common(&priv->ini); } mutex_unlock(&priv->mutex); @@ -108,6 +120,7 @@ static int brcm_usb_phy_exit(struct phy *gphy) brcm_usb_uninit_common(&priv->ini); clk_disable_unprepare(priv->usb_20_clk); clk_disable_unprepare(priv->usb_30_clk); + clk_disable_unprepare(priv->suspend_clk); } mutex_unlock(&priv->mutex); phy->inited = false; @@ -228,11 +241,12 @@ static const struct attribute_group brcm_usb_phy_group = { .attrs = brcm_usb_phy_attrs, }; -static int brcm_usb_phy_dvr_init(struct device *dev, +static int brcm_usb_phy_dvr_init(struct platform_device *pdev, struct brcm_usb_phy_data *priv, struct device_node *dn) { - struct phy *gphy; + struct device *dev = &pdev->dev; + struct phy *gphy = NULL; int err; priv->usb_20_clk = of_clk_get_by_name(dn, "sw_usb"); @@ -275,6 +289,26 @@ static int brcm_usb_phy_dvr_init(struct device *dev, if (err) return err; } + + priv->suspend_clk = clk_get(dev, "usb0_freerun"); + if (IS_ERR(priv->suspend_clk)) { + dev_err(dev, "Suspend Clock not found in Device Tree\n"); + priv->suspend_clk = NULL; + } + + priv->wake_irq = platform_get_irq_byname(pdev, "wake"); + if (priv->wake_irq >= 0) { + err = devm_request_irq(dev, priv->wake_irq, + brcm_usb_phy_wake_isr, 0, + dev_name(dev), gphy); + if (err < 0) + return err; + device_set_wakeup_capable(dev, 1); + } else { + dev_info(dev, + "Wake interrupt missing, system wake not supported\n"); + } + return 0; } @@ -335,7 +369,7 @@ static int brcm_usb_phy_probe(struct platform_device *pdev) if (of_property_read_bool(dn, "brcm,has-eohci")) priv->has_eohci = true; - err = brcm_usb_phy_dvr_init(dev, priv, dn); + err = brcm_usb_phy_dvr_init(pdev, priv, dn); if (err) return err; @@ -386,10 +420,13 @@ static int brcm_usb_phy_suspend(struct device *dev) if (priv->phys[BRCM_USB_PHY_2_0].inited) brcm_usb_uninit_eohci(&priv->ini); brcm_usb_uninit_common(&priv->ini); + brcm_usb_wake_enable(&priv->ini, true); if (priv->phys[BRCM_USB_PHY_3_0].inited) clk_disable_unprepare(priv->usb_30_clk); if (priv->phys[BRCM_USB_PHY_2_0].inited) clk_disable_unprepare(priv->usb_20_clk); + if (priv->wake_irq >= 0) + enable_irq_wake(priv->wake_irq); } return 0; } @@ -400,6 +437,7 @@ static int brcm_usb_phy_resume(struct device *dev) clk_prepare_enable(priv->usb_20_clk); clk_prepare_enable(priv->usb_30_clk); + brcm_usb_wake_enable(&priv->ini, false); brcm_usb_init_ipp(&priv->ini); /* @@ -407,6 +445,8 @@ static int brcm_usb_phy_resume(struct device *dev) * Uninitialize anything that wasn't previously initialized. */ if (priv->init_count) { + if (priv->wake_irq >= 0) + disable_irq_wake(priv->wake_irq); brcm_usb_init_common(&priv->ini); if (priv->phys[BRCM_USB_PHY_2_0].inited) { brcm_usb_init_eohci(&priv->ini);