phy: usb: add support for bcm74110

bcm74110 adds a freerun utmi/ref clock that saves further power during
suspend states. A tune is also necessary to pass USB compliance test.

Signed-off-by: Justin Chen <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: Ryceancurry

drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c

@@ -43,6 +43,8 @@
 #define   USB_CTRL_SETUP_tca_drv_sel_MASK		BIT(24)
 #define   USB_CTRL_SETUP_STRAP_IPP_SEL_MASK		BIT(25)
 #define USB_CTRL_USB_PM			0x04
+#define   USB_CTRL_USB_PM_REF_S2_CLK_SWITCH_EN_MASK	BIT(1)
+#define   USB_CTRL_USB_PM_UTMI_S2_CLK_SWITCH_EN_MASK	BIT(2)
 #define   USB_CTRL_USB_PM_XHC_S2_CLK_SWITCH_EN_MASK	BIT(3)
 #define   USB_CTRL_USB_PM_XHC_PME_EN_MASK		BIT(4)
 #define   USB_CTRL_USB_PM_XHC_SOFT_RESETB_MASK		BIT(22)
@@ -61,6 +63,13 @@
 #define   USB_CTRL_CTLR_CSHCR_ctl_pme_en_MASK		BIT(18)
 #define USB_CTRL_P0_U2PHY_CFG1		0x68
 #define   USB_CTRL_P0_U2PHY_CFG1_COMMONONN_MASK		BIT(10)
+#define USB_CTRL_P0_U2PHY_CFG2		0x6c
+#define   USB_CTRL_P0_U2PHY_CFG2_TXVREFTUNE0_MASK	GENMASK(20, 17)
+#define   USB_CTRL_P0_U2PHY_CFG2_TXVREFTUNE0_SHIFT	17
+#define   USB_CTRL_P0_U2PHY_CFG2_TXRESTUNE0_MASK	GENMASK(24, 23)
+#define   USB_CTRL_P0_U2PHY_CFG2_TXRESTUNE0_SHIFT	23
+#define   USB_CTRL_P0_U2PHY_CFG2_TXPREEMPAMPTUNE0_MASK	GENMASK(26, 25)
+#define   USB_CTRL_P0_U2PHY_CFG2_TXPREEMPAMPTUNE0_SHIFT	25
 
 /* Register definitions for the USB_PHY block in 7211b0 */
 #define USB_PHY_PLL_CTL			0x00
@@ -369,6 +378,42 @@ static void usb_uninit_common_7216(struct brcm_usb_init_params *params)
 	}
 }
 
+static void usb_init_common_74110(struct brcm_usb_init_params *params)
+{
+	void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
+	u32 reg;
+
+	reg = brcm_usb_readl(USB_CTRL_REG(ctrl, USB_PM));
+	reg &= ~(USB_CTRL_MASK(USB_PM, REF_S2_CLK_SWITCH_EN) |
+		USB_CTRL_MASK(USB_PM, UTMI_S2_CLK_SWITCH_EN));
+	brcm_usb_writel(reg, USB_CTRL_REG(ctrl, USB_PM));
+
+	usb_init_common_7216(params);
+
+	reg = brcm_usb_readl(USB_CTRL_REG(ctrl, P0_U2PHY_CFG2));
+	reg &= ~(USB_CTRL_P0_U2PHY_CFG2_TXVREFTUNE0_MASK |
+		 USB_CTRL_P0_U2PHY_CFG2_TXRESTUNE0_MASK |
+		 USB_CTRL_P0_U2PHY_CFG2_TXPREEMPAMPTUNE0_MASK);
+	reg |= (0x6 << USB_CTRL_P0_U2PHY_CFG2_TXVREFTUNE0_SHIFT) |
+		(0x3 << USB_CTRL_P0_U2PHY_CFG2_TXRESTUNE0_SHIFT) |
+		(0x2 << USB_CTRL_P0_U2PHY_CFG2_TXPREEMPAMPTUNE0_SHIFT);
+	brcm_usb_writel(reg, USB_CTRL_REG(ctrl, P0_U2PHY_CFG2));
+}
+
+static void usb_uninit_common_74110(struct brcm_usb_init_params *params)
+{
+	void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
+	u32 reg;
+
+	if (params->wake_enabled) {
+		reg = brcm_usb_readl(USB_CTRL_REG(ctrl, USB_PM));
+		reg |= (USB_CTRL_MASK(USB_PM, REF_S2_CLK_SWITCH_EN) |
+		       USB_CTRL_MASK(USB_PM, UTMI_S2_CLK_SWITCH_EN));
+		brcm_usb_writel(reg, USB_CTRL_REG(ctrl, USB_PM));
+	}
+	usb_uninit_common_7216(params);
+}
+
 static void usb_uninit_common_7211b0(struct brcm_usb_init_params *params)
 {
 	void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
@@ -426,6 +471,16 @@ static void usb_set_dual_select(struct brcm_usb_init_params *params)
 	brcm_usb_writel(reg, USB_CTRL_REG(ctrl, USB_DEVICE_CTL1));
 }
 
+static const struct brcm_usb_init_ops bcm74110_ops = {
+	.init_ipp = usb_init_ipp,
+	.init_common = usb_init_common_74110,
+	.init_xhci = usb_init_xhci,
+	.uninit_common = usb_uninit_common_74110,
+	.uninit_xhci = usb_uninit_xhci,
+	.get_dual_select = usb_get_dual_select,
+	.set_dual_select = usb_set_dual_select,
+};
+
 static const struct brcm_usb_init_ops bcm7216_ops = {
 	.init_ipp = usb_init_ipp,
 	.init_common = usb_init_common_7216,
@@ -446,6 +501,12 @@ static const struct brcm_usb_init_ops bcm7211b0_ops = {
 	.set_dual_select = usb_set_dual_select,
 };
 
+void brcm_usb_dvr_init_74110(struct brcm_usb_init_params *params)
+{
+	params->family_name = "74110";
+	params->ops = &bcm74110_ops;
+}
+
 void brcm_usb_dvr_init_7216(struct brcm_usb_init_params *params)
 {
 

drivers/phy/broadcom/phy-brcm-usb-init.h

@@ -72,6 +72,7 @@ struct  brcm_usb_init_params {
 	bool wake_enabled;
 };
 
+void brcm_usb_dvr_init_74110(struct brcm_usb_init_params *params);
 void brcm_usb_dvr_init_4908(struct brcm_usb_init_params *params);
 void brcm_usb_dvr_init_7445(struct brcm_usb_init_params *params);
 void brcm_usb_dvr_init_7216(struct brcm_usb_init_params *params);

drivers/phy/broadcom/phy-brcm-usb.c

@@ -283,6 +283,16 @@ static const struct attribute_group brcm_usb_phy_group = {
 	.attrs = brcm_usb_phy_attrs,
 };
 
+static const struct match_chip_info chip_info_74110 = {
+	.init_func = &brcm_usb_dvr_init_74110,
+	.required_regs = {
+		BRCM_REGS_CTRL,
+		BRCM_REGS_XHCI_EC,
+		BRCM_REGS_XHCI_GBL,
+		-1,
+	},
+};
+
 static const struct match_chip_info chip_info_4908 = {
 	.init_func = &brcm_usb_dvr_init_4908,
 	.required_regs = {
@@ -325,6 +335,10 @@ static const struct match_chip_info chip_info_7445 = {
 };
 
 static const struct of_device_id brcm_usb_dt_ids[] = {
+	{
+		.compatible = "brcm,bcm74110-usb-phy",
+		.data = &chip_info_74110,
+	},
 	{
 		.compatible = "brcm,bcm4908-usb-phy",
 		.data = &chip_info_4908,