// SPDX-License-Identifier: GPL-2.0
/*
* host.c - ChipIdea USB host controller driver
*
* Copyright (c) 2012 Intel Corporation
*
* Author: Alexander Shishkin
*/
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/chipidea.h>
#include <linux/regulator/consumer.h>
#include <linux/pinctrl/consumer.h>
#include "../host/ehci.h"
#include "ci.h"
#include "bits.h"
#include "host.h"
static struct hc_driver __read_mostly ci_ehci_hc_driver;
static int (*orig_bus_suspend)(struct usb_hcd *hcd);
struct ehci_ci_priv {
struct regulator *reg_vbus;
bool enabled;
};
struct ci_hdrc_dma_aligned_buffer {
void *original_buffer;
u8 data[];
};
static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
struct device *dev = hcd->self.controller;
struct ci_hdrc *ci = dev_get_drvdata(dev);
int ret = 0;
int port = HCS_N_PORTS(ehci->hcs_params);
if (priv->reg_vbus && enable != priv->enabled) {
if (port > 1) {
dev_warn(dev,
"Not support multi-port regulator control\n");
return 0;
}
if (enable)
ret = regulator_enable(priv->reg_vbus);
else
ret = regulator_disable(priv->reg_vbus);
if (ret) {
dev_err(dev,
"Failed to %s vbus regulator, ret=%d\n",
enable ? "enable" : "disable", ret);
return ret;
}
priv->enabled = enable;
}
if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) {
if (enable)
usb_phy_vbus_on(ci->usb_phy);
else
usb_phy_vbus_off(ci->usb_phy);
}
if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
/*
* Marvell 28nm HSIC PHY requires forcing the port to HS mode.
* As HSIC is always HS, this should be safe for others.
*/
hw_port_test_set(ci, 5);
hw_port_test_set(ci, 0);
}
return 0;
};
static int ehci_ci_reset(struct usb_hcd *hcd)
{
struct device *dev = hcd->self.controller;
struct ci_hdrc *ci = dev_get_drvdata(dev);
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int ret;
ret = ehci_setup(hcd);
if (ret)
return ret;
ehci->need_io_watchdog = 0;
if (ci->platdata->notify_event) {
ret = ci->platdata->notify_event(ci,
CI_HDRC_CONTROLLER_RESET_EVENT);
if (ret)
return ret;
}
ci_platform_configure(ci);
return ret;
}
static const struct ehci_driver_overrides ehci_ci_overrides = {
.extra_priv_size = sizeof(struct ehci_ci_priv),
.port_power = ehci_ci_portpower,
.reset = ehci_ci_reset,
};
static irqreturn_t host_irq(struct ci_hdrc *ci)
{
return usb_hcd_irq(ci->irq, ci->hcd);
}
static int host_start(struct ci_hdrc *ci)
{
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct ehci_ci_priv *priv;
int ret;
if (usb_disabled())
return -ENODEV;
hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
ci->dev, dev_name(ci->dev), NULL);
if (!hcd)
return -ENOMEM;
dev_set_drvdata(ci->dev, ci);
hcd->rsrc_start = ci->hw_bank.phys;
hcd->rsrc_len = ci->hw_bank.size;
hcd->regs = ci->hw_bank.abs;
hcd->has_tt = 1;
hcd->power_budget = ci->platdata->power_budget;
hcd->tpl_support = ci->platdata->tpl_support;
if (ci->phy || ci->usb_phy) {
hcd->skip_phy_initialization = 1;
if (ci->usb_phy)
hcd->usb_phy = ci->usb_phy;
}
ehci = hcd_to_ehci(hcd);
ehci->caps = ci->hw_bank.cap;
ehci->has_hostpc = ci->hw_bank.lpm;
ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
ehci->imx28_write_fix = ci->imx28_write_fix;
ehci->has_ci_pec_bug = ci->has_portsc_pec_bug;
priv = (struct ehci_ci_priv *)ehci->priv;
priv->reg_vbus = NULL;
if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
ret = regulator_enable(ci->platdata->reg_vbus);
if (ret) {
dev_err(ci->dev,
"Failed to enable vbus regulator, ret=%d\n",
ret);
goto put_hcd;
}
} else {
priv->reg_vbus = ci->platdata->reg_vbus;
}
}
if (ci->platdata->pins_host)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_host);
ci->hcd = hcd;
ret = usb_add_hcd(hcd, 0, 0);
if (ret) {
ci->hcd = NULL;
goto disable_reg;
} else {
struct usb_otg *otg = &ci->otg;
if (ci_otg_is_fsm_mode(ci)) {
otg->host = &hcd->self;
hcd->self.otg_port = 1;
}
if (ci->platdata->notify_event &&
(ci->platdata->flags & CI_HDRC_IMX_IS_HSIC))
ci->platdata->notify_event
(ci, CI_HDRC_IMX_HSIC_ACTIVE_EVENT);
}
return ret;
disable_reg:
if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
regulator_disable(ci->platdata->reg_vbus);
put_hcd:
usb_put_hcd(hcd);
return ret;
}
static void host_stop(struct ci_hdrc *ci)
{
struct usb_hcd *hcd = ci->hcd;
if (hcd) {
if (ci->platdata->notify_event)
ci->platdata->notify_event(ci,
CI_HDRC_CONTROLLER_STOPPED_EVENT);
usb_remove_hcd(hcd);
ci->role = CI_ROLE_END;
synchronize_irq(ci->irq);
usb_put_hcd(hcd);
if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
regulator_disable(ci->platdata->reg_vbus);
}
ci->hcd = NULL;
ci->otg.host = NULL;
if (ci->platdata->pins_host && ci->platdata->pins_default)
pinctrl_select_state(ci->platdata->pctl,
ci->platdata->pins_default);
}
void ci_hdrc_host_destroy(struct ci_hdrc *ci)
{
if (ci->role == CI_ROLE_HOST && ci->hcd)
host_stop(ci);
}
/* The below code is based on tegra ehci driver */
static int ci_ehci_hub_control(
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength
)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
unsigned int ports = HCS_N_PORTS(ehci->hcs_params);
u32 __iomem *status_reg;
u32 temp, port_index;
unsigned long flags;
int retval = 0;
bool done = false;
struct device *dev = hcd->self.controller;
struct ci_hdrc *ci = dev_get_drvdata(dev);
port_index = wIndex & 0xff;
port_index -= (port_index > 0);
status_reg = &ehci->regs->port_status[port_index];
spin_lock_irqsave(&ehci->lock, flags);
if (ci->platdata->hub_control) {
retval = ci->platdata->hub_control(ci, typeReq, wValue, wIndex,
buf, wLength, &done, &flags);
if (done)
goto done;
}
if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
if (!wIndex || wIndex > ports) {
retval = -EPIPE;
goto done;
}
temp = ehci_readl(ehci, status_reg);
if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
retval = -EPIPE;
goto done;
}
temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
temp |= PORT_WKDISC_E | PORT_WKOC_E;
ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
/*
* If a transaction is in progress, there may be a delay in
* suspending the port. Poll until the port is suspended.
*/
if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
PORT_SUSPEND, 5000))
ehci_err(ehci, "timeout waiting for SUSPEND\n");
if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
if (ci->platdata->notify_event)
ci->platdata->notify_event(ci,
CI_HDRC_IMX_HSIC_SUSPEND_EVENT);
temp = ehci_readl(ehci, status_reg);
temp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
ehci_writel(ehci, temp, status_reg);
}
set_bit(port_index, &ehci->suspended_ports);
goto done;
}
/*
* After resume has finished, it needs do some post resume
* operation for some SoCs.
*/
else if (typeReq == ClearPortFeature &&
wValue == USB_PORT_FEAT_C_SUSPEND) {
/* Make sure the resume has finished, it should be finished */
if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 25000))
ehci_err(ehci, "timeout waiting for resume\n");
}
spin_unlock_irqrestore(&ehci->lock, flags);
/* Handle the hub control events here */
return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
done:
spin_unlock_irqrestore(&ehci->lock, flags);
return retval;
}
static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct device *dev = hcd->self.controller;
struct ci_hdrc *ci = dev_get_drvdata(dev);
int port;
u32 tmp;
int ret = orig_bus_suspend(hcd);
if (ret)
return ret;
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *reg = &ehci->regs->port_status[port];
u32 portsc = ehci_readl(ehci, reg);
if (portsc & PORT_CONNECT) {
/*
* For chipidea, the resume signal will be ended
* automatically, so for remote wakeup case, the
* usbcmd.rs may not be set before the resume has
* ended if other resume paths consumes too much
* time (~24ms), in that case, the SOF will not
* send out within 3ms after resume ends, then the
* high speed device will enter full speed mode.
*/
tmp = ehci_readl(ehci, &ehci->regs->command);
tmp |= CMD_RUN;
ehci_writel(ehci, tmp, &ehci->regs->command);
/*
* It needs a short delay between set RS bit and PHCD.
*/
usleep_range(150, 200);
/*
* Need to clear WKCN and WKOC for imx HSIC,
* otherwise, there will be wakeup event.
*/
if (ci->platdata->flags & CI_HDRC_IMX_IS_HSIC) {
tmp = ehci_readl(ehci, reg);
tmp &= ~(PORT_WKDISC_E | PORT_WKCONN_E);
ehci_writel(ehci, tmp, reg);
}
break;
}
}
return 0;
}
static void ci_hdrc_free_dma_aligned_buffer(struct urb *urb, bool copy_back)
{
struct ci_hdrc_dma_aligned_buffer *temp;
if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
return;
urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
temp = container_of(urb->transfer_buffer,
struct ci_hdrc_dma_aligned_buffer, data);
urb->transfer_buffer = temp->original_buffer;
if (copy_back && usb_urb_dir_in(urb)) {
size_t length;
if (usb_pipeisoc(urb->pipe))
length = urb->transfer_buffer_length;
else
length = urb->actual_length;
memcpy(temp->original_buffer, temp->data, length);
}
kfree(temp);
}
static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
{
struct ci_hdrc_dma_aligned_buffer *temp;
if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0)
return 0;
if (IS_ALIGNED((uintptr_t)urb->transfer_buffer, 4)
&& IS_ALIGNED(urb->transfer_buffer_length, 4))
return 0;
temp = kmalloc(sizeof(*temp) + ALIGN(urb->transfer_buffer_length, 4), mem_flags);
if (!temp)
return -ENOMEM;
if (usb_urb_dir_out(urb))
memcpy(temp->data, urb->transfer_buffer,
urb->transfer_buffer_length);
temp->original_buffer = urb->transfer_buffer;
urb->transfer_buffer = temp->data;
urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
return 0;
}
static int ci_hdrc_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
gfp_t mem_flags)
{
int ret;
ret = ci_hdrc_alloc_dma_aligned_buffer(urb, mem_flags);
if (ret)
return ret;
ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
if (ret)
ci_hdrc_free_dma_aligned_buffer(urb, false);
return ret;
}
static void ci_hdrc_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
usb_hcd_unmap_urb_for_dma(hcd, urb);
ci_hdrc_free_dma_aligned_buffer(urb, true);
}
#ifdef CONFIG_PM_SLEEP
static void ci_hdrc_host_suspend(struct ci_hdrc *ci)
{
ehci_suspend(ci->hcd, device_may_wakeup(ci->dev));
}
static void ci_hdrc_host_resume(struct ci_hdrc *ci, bool power_lost)
{
ehci_resume(ci->hcd, power_lost);
}
#endif
int ci_hdrc_host_init(struct ci_hdrc *ci)
{
struct ci_role_driver *rdrv;
if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
return -ENXIO;
rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
if (!rdrv)
return -ENOMEM;
rdrv->start = host_start;
rdrv->stop = host_stop;
#ifdef CONFIG_PM_SLEEP
rdrv->suspend = ci_hdrc_host_suspend;
rdrv->resume = ci_hdrc_host_resume;
#endif
rdrv->irq = host_irq;
rdrv->name = "host";
ci->roles[CI_ROLE_HOST] = rdrv;
if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) {
ci_ehci_hc_driver.map_urb_for_dma = ci_hdrc_map_urb_for_dma;
ci_ehci_hc_driver.unmap_urb_for_dma = ci_hdrc_unmap_urb_for_dma;
}
return 0;
}
void ci_hdrc_host_driver_init(void)
{
ehci_init_driver(&ci_ehci_hc_driver, &ehci_ci_overrides);
orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
ci_ehci_hc_driver.hub_control = ci_ehci_hub_control;
}
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