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390 lines
9.5 KiB
390 lines
9.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* mtu3_dr.c - dual role switch and host glue layer |
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* |
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* Copyright (C) 2016 MediaTek Inc. |
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* |
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* Author: Chunfeng Yun <[email protected]> |
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*/ |
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#include <linux/usb/role.h> |
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#include "mtu3.h" |
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#include "mtu3_dr.h" |
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#include "mtu3_debug.h" |
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#define USB2_PORT 2 |
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#define USB3_PORT 3 |
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enum mtu3_vbus_id_state { |
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MTU3_ID_FLOAT = 1, |
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MTU3_ID_GROUND, |
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MTU3_VBUS_OFF, |
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MTU3_VBUS_VALID, |
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}; |
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static char *mailbox_state_string(enum mtu3_vbus_id_state state) |
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{ |
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switch (state) { |
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case MTU3_ID_FLOAT: |
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return "ID_FLOAT"; |
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case MTU3_ID_GROUND: |
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return "ID_GROUND"; |
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case MTU3_VBUS_OFF: |
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return "VBUS_OFF"; |
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case MTU3_VBUS_VALID: |
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return "VBUS_VALID"; |
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default: |
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return "UNKNOWN"; |
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} |
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} |
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static void toggle_opstate(struct ssusb_mtk *ssusb) |
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{ |
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if (!ssusb->otg_switch.is_u3_drd) { |
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mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION); |
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mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN); |
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} |
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} |
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/* only port0 supports dual-role mode */ |
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static int ssusb_port0_switch(struct ssusb_mtk *ssusb, |
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int version, bool tohost) |
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{ |
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void __iomem *ibase = ssusb->ippc_base; |
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u32 value; |
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dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__, |
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version, tohost ? "host" : "device"); |
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if (version == USB2_PORT) { |
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/* 1. power off and disable u2 port0 */ |
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value = mtu3_readl(ibase, SSUSB_U2_CTRL(0)); |
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value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS; |
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mtu3_writel(ibase, SSUSB_U2_CTRL(0), value); |
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/* 2. power on, enable u2 port0 and select its mode */ |
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value = mtu3_readl(ibase, SSUSB_U2_CTRL(0)); |
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value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS); |
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value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) : |
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(value & (~SSUSB_U2_PORT_HOST_SEL)); |
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mtu3_writel(ibase, SSUSB_U2_CTRL(0), value); |
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} else { |
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/* 1. power off and disable u3 port0 */ |
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value = mtu3_readl(ibase, SSUSB_U3_CTRL(0)); |
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value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS; |
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mtu3_writel(ibase, SSUSB_U3_CTRL(0), value); |
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/* 2. power on, enable u3 port0 and select its mode */ |
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value = mtu3_readl(ibase, SSUSB_U3_CTRL(0)); |
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value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS); |
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value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) : |
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(value & (~SSUSB_U3_PORT_HOST_SEL)); |
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mtu3_writel(ibase, SSUSB_U3_CTRL(0), value); |
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} |
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return 0; |
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} |
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static void switch_port_to_host(struct ssusb_mtk *ssusb) |
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{ |
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u32 check_clk = 0; |
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dev_dbg(ssusb->dev, "%s\n", __func__); |
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ssusb_port0_switch(ssusb, USB2_PORT, true); |
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if (ssusb->otg_switch.is_u3_drd) { |
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ssusb_port0_switch(ssusb, USB3_PORT, true); |
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check_clk = SSUSB_U3_MAC_RST_B_STS; |
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} |
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ssusb_check_clocks(ssusb, check_clk); |
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/* after all clocks are stable */ |
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toggle_opstate(ssusb); |
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} |
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static void switch_port_to_device(struct ssusb_mtk *ssusb) |
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{ |
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u32 check_clk = 0; |
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dev_dbg(ssusb->dev, "%s\n", __func__); |
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ssusb_port0_switch(ssusb, USB2_PORT, false); |
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if (ssusb->otg_switch.is_u3_drd) { |
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ssusb_port0_switch(ssusb, USB3_PORT, false); |
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check_clk = SSUSB_U3_MAC_RST_B_STS; |
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} |
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ssusb_check_clocks(ssusb, check_clk); |
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} |
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int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on) |
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{ |
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struct ssusb_mtk *ssusb = |
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container_of(otg_sx, struct ssusb_mtk, otg_switch); |
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struct regulator *vbus = otg_sx->vbus; |
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int ret; |
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/* vbus is optional */ |
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if (!vbus) |
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return 0; |
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dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off"); |
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if (is_on) { |
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ret = regulator_enable(vbus); |
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if (ret) { |
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dev_err(ssusb->dev, "vbus regulator enable failed\n"); |
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return ret; |
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} |
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} else { |
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regulator_disable(vbus); |
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} |
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return 0; |
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} |
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/* |
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* switch to host: -> MTU3_VBUS_OFF --> MTU3_ID_GROUND |
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* switch to device: -> MTU3_ID_FLOAT --> MTU3_VBUS_VALID |
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*/ |
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static void ssusb_set_mailbox(struct otg_switch_mtk *otg_sx, |
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enum mtu3_vbus_id_state status) |
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{ |
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struct ssusb_mtk *ssusb = |
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container_of(otg_sx, struct ssusb_mtk, otg_switch); |
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struct mtu3 *mtu = ssusb->u3d; |
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dev_dbg(ssusb->dev, "mailbox %s\n", mailbox_state_string(status)); |
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mtu3_dbg_trace(ssusb->dev, "mailbox %s", mailbox_state_string(status)); |
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switch (status) { |
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case MTU3_ID_GROUND: |
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switch_port_to_host(ssusb); |
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ssusb_set_vbus(otg_sx, 1); |
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ssusb->is_host = true; |
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break; |
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case MTU3_ID_FLOAT: |
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ssusb->is_host = false; |
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ssusb_set_vbus(otg_sx, 0); |
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switch_port_to_device(ssusb); |
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break; |
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case MTU3_VBUS_OFF: |
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mtu3_stop(mtu); |
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pm_relax(ssusb->dev); |
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break; |
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case MTU3_VBUS_VALID: |
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/* avoid suspend when works as device */ |
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pm_stay_awake(ssusb->dev); |
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mtu3_start(mtu); |
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break; |
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default: |
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dev_err(ssusb->dev, "invalid state\n"); |
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} |
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} |
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static void ssusb_id_work(struct work_struct *work) |
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{ |
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struct otg_switch_mtk *otg_sx = |
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container_of(work, struct otg_switch_mtk, id_work); |
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if (otg_sx->id_event) |
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ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND); |
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else |
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ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT); |
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} |
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static void ssusb_vbus_work(struct work_struct *work) |
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{ |
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struct otg_switch_mtk *otg_sx = |
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container_of(work, struct otg_switch_mtk, vbus_work); |
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if (otg_sx->vbus_event) |
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ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID); |
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else |
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ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF); |
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} |
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/* |
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* @ssusb_id_notifier is called in atomic context, but @ssusb_set_mailbox |
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* may sleep, so use work queue here |
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*/ |
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static int ssusb_id_notifier(struct notifier_block *nb, |
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unsigned long event, void *ptr) |
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{ |
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struct otg_switch_mtk *otg_sx = |
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container_of(nb, struct otg_switch_mtk, id_nb); |
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otg_sx->id_event = event; |
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schedule_work(&otg_sx->id_work); |
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return NOTIFY_DONE; |
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} |
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static int ssusb_vbus_notifier(struct notifier_block *nb, |
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unsigned long event, void *ptr) |
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{ |
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struct otg_switch_mtk *otg_sx = |
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container_of(nb, struct otg_switch_mtk, vbus_nb); |
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otg_sx->vbus_event = event; |
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schedule_work(&otg_sx->vbus_work); |
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return NOTIFY_DONE; |
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} |
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static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx) |
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{ |
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struct ssusb_mtk *ssusb = |
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container_of(otg_sx, struct ssusb_mtk, otg_switch); |
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struct extcon_dev *edev = otg_sx->edev; |
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int ret; |
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/* extcon is optional */ |
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if (!edev) |
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return 0; |
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otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier; |
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ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB, |
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&otg_sx->vbus_nb); |
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if (ret < 0) { |
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dev_err(ssusb->dev, "failed to register notifier for USB\n"); |
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return ret; |
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} |
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otg_sx->id_nb.notifier_call = ssusb_id_notifier; |
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ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST, |
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&otg_sx->id_nb); |
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if (ret < 0) { |
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dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n"); |
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return ret; |
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} |
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dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n", |
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extcon_get_state(edev, EXTCON_USB), |
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extcon_get_state(edev, EXTCON_USB_HOST)); |
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/* default as host, switch to device mode if needed */ |
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if (extcon_get_state(edev, EXTCON_USB_HOST) == false) |
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ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT); |
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if (extcon_get_state(edev, EXTCON_USB) == true) |
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ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID); |
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return 0; |
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} |
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/* |
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* We provide an interface via debugfs to switch between host and device modes |
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* depending on user input. |
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* This is useful in special cases, such as uses TYPE-A receptacle but also |
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* wants to support dual-role mode. |
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*/ |
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void ssusb_mode_switch(struct ssusb_mtk *ssusb, int to_host) |
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{ |
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struct otg_switch_mtk *otg_sx = &ssusb->otg_switch; |
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if (to_host) { |
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ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST); |
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ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF); |
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ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND); |
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} else { |
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ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE); |
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ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT); |
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ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID); |
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} |
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} |
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void ssusb_set_force_mode(struct ssusb_mtk *ssusb, |
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enum mtu3_dr_force_mode mode) |
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{ |
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u32 value; |
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value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0)); |
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switch (mode) { |
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case MTU3_DR_FORCE_DEVICE: |
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value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG; |
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break; |
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case MTU3_DR_FORCE_HOST: |
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value |= SSUSB_U2_PORT_FORCE_IDDIG; |
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value &= ~SSUSB_U2_PORT_RG_IDDIG; |
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break; |
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case MTU3_DR_FORCE_NONE: |
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value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG); |
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break; |
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default: |
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return; |
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} |
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mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value); |
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} |
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static int ssusb_role_sw_set(struct usb_role_switch *sw, enum usb_role role) |
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{ |
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struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw); |
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bool to_host = false; |
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if (role == USB_ROLE_HOST) |
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to_host = true; |
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if (to_host ^ ssusb->is_host) |
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ssusb_mode_switch(ssusb, to_host); |
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return 0; |
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} |
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static enum usb_role ssusb_role_sw_get(struct usb_role_switch *sw) |
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{ |
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struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw); |
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enum usb_role role; |
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role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE; |
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return role; |
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} |
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static int ssusb_role_sw_register(struct otg_switch_mtk *otg_sx) |
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{ |
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struct usb_role_switch_desc role_sx_desc = { 0 }; |
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struct ssusb_mtk *ssusb = |
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container_of(otg_sx, struct ssusb_mtk, otg_switch); |
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if (!otg_sx->role_sw_used) |
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return 0; |
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role_sx_desc.set = ssusb_role_sw_set; |
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role_sx_desc.get = ssusb_role_sw_get; |
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role_sx_desc.fwnode = dev_fwnode(ssusb->dev); |
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role_sx_desc.driver_data = ssusb; |
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otg_sx->role_sw = usb_role_switch_register(ssusb->dev, &role_sx_desc); |
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return PTR_ERR_OR_ZERO(otg_sx->role_sw); |
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} |
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int ssusb_otg_switch_init(struct ssusb_mtk *ssusb) |
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{ |
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struct otg_switch_mtk *otg_sx = &ssusb->otg_switch; |
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int ret = 0; |
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INIT_WORK(&otg_sx->id_work, ssusb_id_work); |
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INIT_WORK(&otg_sx->vbus_work, ssusb_vbus_work); |
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if (otg_sx->manual_drd_enabled) |
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ssusb_dr_debugfs_init(ssusb); |
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else if (otg_sx->role_sw_used) |
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ret = ssusb_role_sw_register(otg_sx); |
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else |
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ret = ssusb_extcon_register(otg_sx); |
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return ret; |
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} |
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void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb) |
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{ |
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struct otg_switch_mtk *otg_sx = &ssusb->otg_switch; |
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cancel_work_sync(&otg_sx->id_work); |
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cancel_work_sync(&otg_sx->vbus_work); |
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usb_role_switch_unregister(otg_sx->role_sw); |
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}
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