![Chunfeng Yun](/assets/img/avatar_default.png)
By introducing mailbox_state_string(), allow to make debug log more readable Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
344 lines
8.3 KiB
C
344 lines
8.3 KiB
C
// 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 "mtu3.h"
|
|
#include "mtu3_dr.h"
|
|
#include "mtu3_debug.h"
|
|
|
|
#define USB2_PORT 2
|
|
#define USB3_PORT 3
|
|
|
|
enum mtu3_vbus_id_state {
|
|
MTU3_ID_FLOAT = 1,
|
|
MTU3_ID_GROUND,
|
|
MTU3_VBUS_OFF,
|
|
MTU3_VBUS_VALID,
|
|
};
|
|
|
|
static char *mailbox_state_string(enum mtu3_vbus_id_state state)
|
|
{
|
|
switch (state) {
|
|
case MTU3_ID_FLOAT:
|
|
return "ID_FLOAT";
|
|
case MTU3_ID_GROUND:
|
|
return "ID_GROUND";
|
|
case MTU3_VBUS_OFF:
|
|
return "VBUS_OFF";
|
|
case MTU3_VBUS_VALID:
|
|
return "VBUS_VALID";
|
|
default:
|
|
return "UNKNOWN";
|
|
}
|
|
}
|
|
|
|
static void toggle_opstate(struct ssusb_mtk *ssusb)
|
|
{
|
|
if (!ssusb->otg_switch.is_u3_drd) {
|
|
mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);
|
|
mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);
|
|
}
|
|
}
|
|
|
|
/* only port0 supports dual-role mode */
|
|
static int ssusb_port0_switch(struct ssusb_mtk *ssusb,
|
|
int version, bool tohost)
|
|
{
|
|
void __iomem *ibase = ssusb->ippc_base;
|
|
u32 value;
|
|
|
|
dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,
|
|
version, tohost ? "host" : "device");
|
|
|
|
if (version == USB2_PORT) {
|
|
/* 1. power off and disable u2 port0 */
|
|
value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
|
|
value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
|
|
mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
|
|
|
|
/* 2. power on, enable u2 port0 and select its mode */
|
|
value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
|
|
value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
|
|
value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) :
|
|
(value & (~SSUSB_U2_PORT_HOST_SEL));
|
|
mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
|
|
} else {
|
|
/* 1. power off and disable u3 port0 */
|
|
value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
|
|
value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
|
|
mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
|
|
|
|
/* 2. power on, enable u3 port0 and select its mode */
|
|
value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
|
|
value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
|
|
value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) :
|
|
(value & (~SSUSB_U3_PORT_HOST_SEL));
|
|
mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void switch_port_to_host(struct ssusb_mtk *ssusb)
|
|
{
|
|
u32 check_clk = 0;
|
|
|
|
dev_dbg(ssusb->dev, "%s\n", __func__);
|
|
|
|
ssusb_port0_switch(ssusb, USB2_PORT, true);
|
|
|
|
if (ssusb->otg_switch.is_u3_drd) {
|
|
ssusb_port0_switch(ssusb, USB3_PORT, true);
|
|
check_clk = SSUSB_U3_MAC_RST_B_STS;
|
|
}
|
|
|
|
ssusb_check_clocks(ssusb, check_clk);
|
|
|
|
/* after all clocks are stable */
|
|
toggle_opstate(ssusb);
|
|
}
|
|
|
|
static void switch_port_to_device(struct ssusb_mtk *ssusb)
|
|
{
|
|
u32 check_clk = 0;
|
|
|
|
dev_dbg(ssusb->dev, "%s\n", __func__);
|
|
|
|
ssusb_port0_switch(ssusb, USB2_PORT, false);
|
|
|
|
if (ssusb->otg_switch.is_u3_drd) {
|
|
ssusb_port0_switch(ssusb, USB3_PORT, false);
|
|
check_clk = SSUSB_U3_MAC_RST_B_STS;
|
|
}
|
|
|
|
ssusb_check_clocks(ssusb, check_clk);
|
|
}
|
|
|
|
int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)
|
|
{
|
|
struct ssusb_mtk *ssusb =
|
|
container_of(otg_sx, struct ssusb_mtk, otg_switch);
|
|
struct regulator *vbus = otg_sx->vbus;
|
|
int ret;
|
|
|
|
/* vbus is optional */
|
|
if (!vbus)
|
|
return 0;
|
|
|
|
dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");
|
|
|
|
if (is_on) {
|
|
ret = regulator_enable(vbus);
|
|
if (ret) {
|
|
dev_err(ssusb->dev, "vbus regulator enable failed\n");
|
|
return ret;
|
|
}
|
|
} else {
|
|
regulator_disable(vbus);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* switch to host: -> MTU3_VBUS_OFF --> MTU3_ID_GROUND
|
|
* switch to device: -> MTU3_ID_FLOAT --> MTU3_VBUS_VALID
|
|
*/
|
|
static void ssusb_set_mailbox(struct otg_switch_mtk *otg_sx,
|
|
enum mtu3_vbus_id_state status)
|
|
{
|
|
struct ssusb_mtk *ssusb =
|
|
container_of(otg_sx, struct ssusb_mtk, otg_switch);
|
|
struct mtu3 *mtu = ssusb->u3d;
|
|
|
|
dev_dbg(ssusb->dev, "mailbox %s\n", mailbox_state_string(status));
|
|
mtu3_dbg_trace(ssusb->dev, "mailbox %s", mailbox_state_string(status));
|
|
|
|
switch (status) {
|
|
case MTU3_ID_GROUND:
|
|
switch_port_to_host(ssusb);
|
|
ssusb_set_vbus(otg_sx, 1);
|
|
ssusb->is_host = true;
|
|
break;
|
|
case MTU3_ID_FLOAT:
|
|
ssusb->is_host = false;
|
|
ssusb_set_vbus(otg_sx, 0);
|
|
switch_port_to_device(ssusb);
|
|
break;
|
|
case MTU3_VBUS_OFF:
|
|
mtu3_stop(mtu);
|
|
pm_relax(ssusb->dev);
|
|
break;
|
|
case MTU3_VBUS_VALID:
|
|
/* avoid suspend when works as device */
|
|
pm_stay_awake(ssusb->dev);
|
|
mtu3_start(mtu);
|
|
break;
|
|
default:
|
|
dev_err(ssusb->dev, "invalid state\n");
|
|
}
|
|
}
|
|
|
|
static void ssusb_id_work(struct work_struct *work)
|
|
{
|
|
struct otg_switch_mtk *otg_sx =
|
|
container_of(work, struct otg_switch_mtk, id_work);
|
|
|
|
if (otg_sx->id_event)
|
|
ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
|
|
else
|
|
ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
|
|
}
|
|
|
|
static void ssusb_vbus_work(struct work_struct *work)
|
|
{
|
|
struct otg_switch_mtk *otg_sx =
|
|
container_of(work, struct otg_switch_mtk, vbus_work);
|
|
|
|
if (otg_sx->vbus_event)
|
|
ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
|
|
else
|
|
ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
|
|
}
|
|
|
|
/*
|
|
* @ssusb_id_notifier is called in atomic context, but @ssusb_set_mailbox
|
|
* may sleep, so use work queue here
|
|
*/
|
|
static int ssusb_id_notifier(struct notifier_block *nb,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct otg_switch_mtk *otg_sx =
|
|
container_of(nb, struct otg_switch_mtk, id_nb);
|
|
|
|
otg_sx->id_event = event;
|
|
schedule_work(&otg_sx->id_work);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int ssusb_vbus_notifier(struct notifier_block *nb,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct otg_switch_mtk *otg_sx =
|
|
container_of(nb, struct otg_switch_mtk, vbus_nb);
|
|
|
|
otg_sx->vbus_event = event;
|
|
schedule_work(&otg_sx->vbus_work);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
|
|
{
|
|
struct ssusb_mtk *ssusb =
|
|
container_of(otg_sx, struct ssusb_mtk, otg_switch);
|
|
struct extcon_dev *edev = otg_sx->edev;
|
|
int ret;
|
|
|
|
/* extcon is optional */
|
|
if (!edev)
|
|
return 0;
|
|
|
|
otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;
|
|
ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB,
|
|
&otg_sx->vbus_nb);
|
|
if (ret < 0) {
|
|
dev_err(ssusb->dev, "failed to register notifier for USB\n");
|
|
return ret;
|
|
}
|
|
|
|
otg_sx->id_nb.notifier_call = ssusb_id_notifier;
|
|
ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,
|
|
&otg_sx->id_nb);
|
|
if (ret < 0) {
|
|
dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");
|
|
return ret;
|
|
}
|
|
|
|
dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
|
|
extcon_get_state(edev, EXTCON_USB),
|
|
extcon_get_state(edev, EXTCON_USB_HOST));
|
|
|
|
/* default as host, switch to device mode if needed */
|
|
if (extcon_get_state(edev, EXTCON_USB_HOST) == false)
|
|
ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
|
|
if (extcon_get_state(edev, EXTCON_USB) == true)
|
|
ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We provide an interface via debugfs to switch between host and device modes
|
|
* depending on user input.
|
|
* This is useful in special cases, such as uses TYPE-A receptacle but also
|
|
* wants to support dual-role mode.
|
|
*/
|
|
void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host)
|
|
{
|
|
struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
|
|
|
|
if (to_host) {
|
|
ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
|
|
ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
|
|
ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
|
|
} else {
|
|
ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE);
|
|
ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
|
|
ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
|
|
}
|
|
}
|
|
|
|
void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
|
|
enum mtu3_dr_force_mode mode)
|
|
{
|
|
u32 value;
|
|
|
|
value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));
|
|
switch (mode) {
|
|
case MTU3_DR_FORCE_DEVICE:
|
|
value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG;
|
|
break;
|
|
case MTU3_DR_FORCE_HOST:
|
|
value |= SSUSB_U2_PORT_FORCE_IDDIG;
|
|
value &= ~SSUSB_U2_PORT_RG_IDDIG;
|
|
break;
|
|
case MTU3_DR_FORCE_NONE:
|
|
value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG);
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
|
|
}
|
|
|
|
int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
|
|
{
|
|
struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
|
|
int ret = 0;
|
|
|
|
INIT_WORK(&otg_sx->id_work, ssusb_id_work);
|
|
INIT_WORK(&otg_sx->vbus_work, ssusb_vbus_work);
|
|
|
|
if (otg_sx->manual_drd_enabled)
|
|
ssusb_dr_debugfs_init(ssusb);
|
|
else
|
|
ret = ssusb_extcon_register(otg_sx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
|
|
{
|
|
struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
|
|
|
|
cancel_work_sync(&otg_sx->id_work);
|
|
cancel_work_sync(&otg_sx->vbus_work);
|
|
}
|