drivers/usb/mtu3/mtu3_host.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * mtu3_dr.c - dual role switch and host glue layer
  *
  * Copyright (C) 2016 MediaTek Inc.
  *
  * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
  */

 #include <linux/clk.h>
 #include <linux/iopoll.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>

 #include "mtu3.h"
 #include "mtu3_dr.h"

 /* mt8173 etc */
 #define PERI_WK_CTRL1	0x4
 #define WC1_IS_C(x)	(((x) & 0xf) << 26)  /* cycle debounce */
 #define WC1_IS_EN	BIT(25)
 #define WC1_IS_P	BIT(6)  /* polarity for ip sleep */

 /* mt2712 etc */
 #define PERI_SSUSB_SPM_CTRL	0x0
 #define SSC_IP_SLEEP_EN	BIT(4)
 #define SSC_SPM_INT_EN		BIT(1)

 enum ssusb_uwk_vers {
 	SSUSB_UWK_V1 = 1,
 	SSUSB_UWK_V2,
 };

 /*
  * ip-sleep wakeup mode:
  * all clocks can be turn off, but power domain should be kept on
  */
 static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable)
 {
 	u32 reg, msk, val;

 	switch (ssusb->uwk_vers) {
 	case SSUSB_UWK_V1:
 		reg = ssusb->uwk_reg_base + PERI_WK_CTRL1;
 		msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P;
 		val = enable ? (WC1_IS_EN | WC1_IS_C(0x8)) : 0;
 		break;
 	case SSUSB_UWK_V2:
 		reg = ssusb->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
 		msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN;
 		val = enable ? msk : 0;
 		break;
 	default:
 		return;
 	}
 	regmap_update_bits(ssusb->uwk, reg, msk, val);
 }

 int ssusb_wakeup_of_property_parse(struct ssusb_mtk *ssusb,
 				struct device_node *dn)
 {
 	struct of_phandle_args args;
 	int ret;

 	/* wakeup function is optional */
 	ssusb->uwk_en = of_property_read_bool(dn, "wakeup-source");
 	if (!ssusb->uwk_en)
 		return 0;

 	ret = of_parse_phandle_with_fixed_args(dn,
 				"mediatek,syscon-wakeup", 2, 0, &args);
 	if (ret)
 		return ret;

 	ssusb->uwk_reg_base = args.args[0];
 	ssusb->uwk_vers = args.args[1];
 	ssusb->uwk = syscon_node_to_regmap(args.np);
 	of_node_put(args.np);
 	dev_info(ssusb->dev, "uwk - reg:0x%x, version:%d\n",
 			ssusb->uwk_reg_base, ssusb->uwk_vers);

 	return PTR_ERR_OR_ZERO(ssusb->uwk);
 }

 void ssusb_wakeup_set(struct ssusb_mtk *ssusb, bool enable)
 {
 	if (ssusb->uwk_en)
 		ssusb_wakeup_ip_sleep_set(ssusb, enable);
 }

 static void host_ports_num_get(struct ssusb_mtk *ssusb)
 {
 	u32 xhci_cap;

 	xhci_cap = mtu3_readl(ssusb->ippc_base, U3D_SSUSB_IP_XHCI_CAP);
 	ssusb->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap);
 	ssusb->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap);

 	dev_dbg(ssusb->dev, "host - u2_ports:%d, u3_ports:%d\n",
 		 ssusb->u2_ports, ssusb->u3_ports);
 }

 /* only configure ports will be used later */
 int ssusb_host_enable(struct ssusb_mtk *ssusb)
 {
 	void __iomem *ibase = ssusb->ippc_base;
 	int num_u3p = ssusb->u3_ports;
 	int num_u2p = ssusb->u2_ports;
 	int u3_ports_disabed;
 	u32 check_clk;
 	u32 value;
 	int i;

 	/* power on host ip */
 	mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);

 	/* power on and enable u3 ports except skipped ones */
 	u3_ports_disabed = 0;
 	for (i = 0; i < num_u3p; i++) {
 		if ((0x1 << i) & ssusb->u3p_dis_msk) {
 			u3_ports_disabed++;
 			continue;
 		}

 		value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
 		value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
 		value |= SSUSB_U3_PORT_HOST_SEL;
 		mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
 	}

 	/* power on and enable all u2 ports */
 	for (i = 0; i < num_u2p; i++) {
 		value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
 		value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
 		value |= SSUSB_U2_PORT_HOST_SEL;
 		mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
 	}

 	check_clk = SSUSB_XHCI_RST_B_STS;
 	if (num_u3p > u3_ports_disabed)
 		check_clk = SSUSB_U3_MAC_RST_B_STS;

 	return ssusb_check_clocks(ssusb, check_clk);
 }

 int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend)
 {
 	void __iomem *ibase = ssusb->ippc_base;
 	int num_u3p = ssusb->u3_ports;
 	int num_u2p = ssusb->u2_ports;
 	u32 value;
 	int ret;
 	int i;

 	/* power down and disable u3 ports except skipped ones */
 	for (i = 0; i < num_u3p; i++) {
 		if ((0x1 << i) & ssusb->u3p_dis_msk)
 			continue;

 		value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
 		value |= SSUSB_U3_PORT_PDN;
 		value |= suspend ? 0 : SSUSB_U3_PORT_DIS;
 		mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
 	}

 	/* power down and disable all u2 ports */
 	for (i = 0; i < num_u2p; i++) {
 		value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
 		value |= SSUSB_U2_PORT_PDN;
 		value |= suspend ? 0 : SSUSB_U2_PORT_DIS;
 		mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
 	}

 	/* power down host ip */
 	mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);

 	if (!suspend)
 		return 0;

 	/* wait for host ip to sleep */
 	ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
 			  (value & SSUSB_IP_SLEEP_STS), 100, 100000);
 	if (ret)
 		dev_err(ssusb->dev, "ip sleep failed!!!\n");

 	return ret;
 }

 static void ssusb_host_setup(struct ssusb_mtk *ssusb)
 {
 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;

 	host_ports_num_get(ssusb);

 	/*
 	 * power on host and power on/enable all ports
 	 * if support OTG, gadget driver will switch port0 to device mode
 	 */
 	ssusb_host_enable(ssusb);

 	if (otg_sx->manual_drd_enabled)
 		ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);

 	/* if port0 supports dual-role, works as host mode by default */
 	ssusb_set_vbus(&ssusb->otg_switch, 1);
 }

 static void ssusb_host_cleanup(struct ssusb_mtk *ssusb)
 {
 	if (ssusb->is_host)
 		ssusb_set_vbus(&ssusb->otg_switch, 0);

 	ssusb_host_disable(ssusb, false);
 }

 /*
  * If host supports multiple ports, the VBUSes(5V) of ports except port0
  * which supports OTG are better to be enabled by default in DTS.
  * Because the host driver will keep link with devices attached when system
  * enters suspend mode, so no need to control VBUSes after initialization.
  */
 int ssusb_host_init(struct ssusb_mtk *ssusb, struct device_node *parent_dn)
 {
 	struct device *parent_dev = ssusb->dev;
 	int ret;

 	ssusb_host_setup(ssusb);

 	ret = of_platform_populate(parent_dn, NULL, NULL, parent_dev);
 	if (ret) {
 		dev_dbg(parent_dev, "failed to create child devices at %pOF\n",
 				parent_dn);
 		return ret;
 	}

 	dev_info(parent_dev, "xHCI platform device register success...\n");

 	return 0;
 }

 void ssusb_host_exit(struct ssusb_mtk *ssusb)
 {
 	of_platform_depopulate(ssusb->dev);
 	ssusb_host_cleanup(ssusb);
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* mtu3_dr.c - dual role switch and host glue layer
	*
	* Copyright (C) 2016 MediaTek Inc.
	*
	* Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
	*/

	#include <linux/clk.h>
	#include <linux/iopoll.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/mfd/syscon.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>

	#include "mtu3.h"
	#include "mtu3_dr.h"

	/* mt8173 etc */
	#define PERI_WK_CTRL1 0x4
	#define WC1_IS_C(x) (((x) & 0xf) << 26) /* cycle debounce */
	#define WC1_IS_EN BIT(25)
	#define WC1_IS_P BIT(6) /* polarity for ip sleep */

	/* mt2712 etc */
	#define PERI_SSUSB_SPM_CTRL 0x0
	#define SSC_IP_SLEEP_EN BIT(4)
	#define SSC_SPM_INT_EN BIT(1)

	enum ssusb_uwk_vers {
	SSUSB_UWK_V1 = 1,
	SSUSB_UWK_V2,
	};

	/*
	* ip-sleep wakeup mode:
	* all clocks can be turn off, but power domain should be kept on
	*/
	static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable)
	{
	u32 reg, msk, val;

	switch (ssusb->uwk_vers) {
	case SSUSB_UWK_V1:
	reg = ssusb->uwk_reg_base + PERI_WK_CTRL1;
	msk = WC1_IS_EN \| WC1_IS_C(0xf) \| WC1_IS_P;
	val = enable ? (WC1_IS_EN \| WC1_IS_C(0x8)) : 0;
	break;
	case SSUSB_UWK_V2:
	reg = ssusb->uwk_reg_base + PERI_SSUSB_SPM_CTRL;
	msk = SSC_IP_SLEEP_EN \| SSC_SPM_INT_EN;
	val = enable ? msk : 0;
	break;
	default:
	return;
	}
	regmap_update_bits(ssusb->uwk, reg, msk, val);
	}

	int ssusb_wakeup_of_property_parse(struct ssusb_mtk *ssusb,
	struct device_node *dn)
	{
	struct of_phandle_args args;
	int ret;

	/* wakeup function is optional */
	ssusb->uwk_en = of_property_read_bool(dn, "wakeup-source");
	if (!ssusb->uwk_en)
	return 0;

	ret = of_parse_phandle_with_fixed_args(dn,
	"mediatek,syscon-wakeup", 2, 0, &args);
	if (ret)
	return ret;

	ssusb->uwk_reg_base = args.args[0];
	ssusb->uwk_vers = args.args[1];
	ssusb->uwk = syscon_node_to_regmap(args.np);
	of_node_put(args.np);
	dev_info(ssusb->dev, "uwk - reg:0x%x, version:%d\n",
	ssusb->uwk_reg_base, ssusb->uwk_vers);

	return PTR_ERR_OR_ZERO(ssusb->uwk);
	}

	void ssusb_wakeup_set(struct ssusb_mtk *ssusb, bool enable)
	{
	if (ssusb->uwk_en)
	ssusb_wakeup_ip_sleep_set(ssusb, enable);
	}

	static void host_ports_num_get(struct ssusb_mtk *ssusb)
	{
	u32 xhci_cap;

	xhci_cap = mtu3_readl(ssusb->ippc_base, U3D_SSUSB_IP_XHCI_CAP);
	ssusb->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap);
	ssusb->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap);

	dev_dbg(ssusb->dev, "host - u2_ports:%d, u3_ports:%d\n",
	ssusb->u2_ports, ssusb->u3_ports);
	}

	/* only configure ports will be used later */
	int ssusb_host_enable(struct ssusb_mtk *ssusb)
	{
	void __iomem *ibase = ssusb->ippc_base;
	int num_u3p = ssusb->u3_ports;
	int num_u2p = ssusb->u2_ports;
	int u3_ports_disabed;
	u32 check_clk;
	u32 value;
	int i;

	/* power on host ip */
	mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);

	/* power on and enable u3 ports except skipped ones */
	u3_ports_disabed = 0;
	for (i = 0; i < num_u3p; i++) {
	if ((0x1 << i) & ssusb->u3p_dis_msk) {
	u3_ports_disabed++;
	continue;
	}

	value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
	value &= ~(SSUSB_U3_PORT_PDN \| SSUSB_U3_PORT_DIS);
	value \|= SSUSB_U3_PORT_HOST_SEL;
	mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
	}

	/* power on and enable all u2 ports */
	for (i = 0; i < num_u2p; i++) {
	value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
	value &= ~(SSUSB_U2_PORT_PDN \| SSUSB_U2_PORT_DIS);
	value \|= SSUSB_U2_PORT_HOST_SEL;
	mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
	}

	check_clk = SSUSB_XHCI_RST_B_STS;
	if (num_u3p > u3_ports_disabed)
	check_clk = SSUSB_U3_MAC_RST_B_STS;

	return ssusb_check_clocks(ssusb, check_clk);
	}

	int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend)
	{
	void __iomem *ibase = ssusb->ippc_base;
	int num_u3p = ssusb->u3_ports;
	int num_u2p = ssusb->u2_ports;
	u32 value;
	int ret;
	int i;

	/* power down and disable u3 ports except skipped ones */
	for (i = 0; i < num_u3p; i++) {
	if ((0x1 << i) & ssusb->u3p_dis_msk)
	continue;

	value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
	value \|= SSUSB_U3_PORT_PDN;
	value \|= suspend ? 0 : SSUSB_U3_PORT_DIS;
	mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
	}

	/* power down and disable all u2 ports */
	for (i = 0; i < num_u2p; i++) {
	value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
	value \|= SSUSB_U2_PORT_PDN;
	value \|= suspend ? 0 : SSUSB_U2_PORT_DIS;
	mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
	}

	/* power down host ip */
	mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);

	if (!suspend)
	return 0;

	/* wait for host ip to sleep */
	ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
	(value & SSUSB_IP_SLEEP_STS), 100, 100000);
	if (ret)
	dev_err(ssusb->dev, "ip sleep failed!!!\n");

	return ret;
	}

	static void ssusb_host_setup(struct ssusb_mtk *ssusb)
	{
	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;

	host_ports_num_get(ssusb);

	/*
	* power on host and power on/enable all ports
	* if support OTG, gadget driver will switch port0 to device mode
	*/
	ssusb_host_enable(ssusb);

	if (otg_sx->manual_drd_enabled)
	ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);

	/* if port0 supports dual-role, works as host mode by default */
	ssusb_set_vbus(&ssusb->otg_switch, 1);
	}

	static void ssusb_host_cleanup(struct ssusb_mtk *ssusb)
	{
	if (ssusb->is_host)
	ssusb_set_vbus(&ssusb->otg_switch, 0);

	ssusb_host_disable(ssusb, false);
	}

	/*
	* If host supports multiple ports, the VBUSes(5V) of ports except port0
	* which supports OTG are better to be enabled by default in DTS.
	* Because the host driver will keep link with devices attached when system
	* enters suspend mode, so no need to control VBUSes after initialization.
	*/
	int ssusb_host_init(struct ssusb_mtk ssusb, struct device_node parent_dn)
	{
	struct device *parent_dev = ssusb->dev;
	int ret;

	ssusb_host_setup(ssusb);

	ret = of_platform_populate(parent_dn, NULL, NULL, parent_dev);
	if (ret) {
	dev_dbg(parent_dev, "failed to create child devices at %pOF\n",
	parent_dn);
	return ret;
	}

	dev_info(parent_dev, "xHCI platform device register success...\n");

	return 0;
	}

	void ssusb_host_exit(struct ssusb_mtk *ssusb)
	{
	of_platform_depopulate(ssusb->dev);
	ssusb_host_cleanup(ssusb);
	}