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linux/linux-5.4.31/drivers/usb/dwc3/core.c

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// SPDX-License-Identifier: GPL-2.0
/**
* core.c - DesignWare USB3 DRD Controller Core file
*
* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*/
#include <linux/clk.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/acpi.h>
#include <linux/pinctrl/consumer.h>
#include <linux/reset.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/of.h>
#include <linux/usb/otg.h>
#include "core.h"
#include "gadget.h"
#include "io.h"
#include "debug.h"
#define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */
/**
* dwc3_get_dr_mode - Validates and sets dr_mode
* @dwc: pointer to our context structure
*/
static int dwc3_get_dr_mode(struct dwc3 *dwc)
{
enum usb_dr_mode mode;
struct device *dev = dwc->dev;
unsigned int hw_mode;
if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
dwc->dr_mode = USB_DR_MODE_OTG;
mode = dwc->dr_mode;
hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
switch (hw_mode) {
case DWC3_GHWPARAMS0_MODE_GADGET:
if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) {
dev_err(dev,
"Controller does not support host mode.\n");
return -EINVAL;
}
mode = USB_DR_MODE_PERIPHERAL;
break;
case DWC3_GHWPARAMS0_MODE_HOST:
if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
dev_err(dev,
"Controller does not support device mode.\n");
return -EINVAL;
}
mode = USB_DR_MODE_HOST;
break;
default:
if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
mode = USB_DR_MODE_HOST;
else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
mode = USB_DR_MODE_PERIPHERAL;
/*
* DWC_usb31 and DWC_usb3 v3.30a and higher do not support OTG
* mode. If the controller supports DRD but the dr_mode is not
* specified or set to OTG, then set the mode to peripheral.
*/
if (mode == USB_DR_MODE_OTG &&
dwc->revision >= DWC3_REVISION_330A)
mode = USB_DR_MODE_PERIPHERAL;
}
if (mode != dwc->dr_mode) {
dev_warn(dev,
"Configuration mismatch. dr_mode forced to %s\n",
mode == USB_DR_MODE_HOST ? "host" : "gadget");
dwc->dr_mode = mode;
}
return 0;
}
void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
{
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_GCTL);
reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
reg |= DWC3_GCTL_PRTCAPDIR(mode);
dwc3_writel(dwc->regs, DWC3_GCTL, reg);
dwc->current_dr_role = mode;
}
static void __dwc3_set_mode(struct work_struct *work)
{
struct dwc3 *dwc = work_to_dwc(work);
unsigned long flags;
int ret;
if (dwc->dr_mode != USB_DR_MODE_OTG)
return;
if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
dwc3_otg_update(dwc, 0);
if (!dwc->desired_dr_role)
return;
if (dwc->desired_dr_role == dwc->current_dr_role)
return;
if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
return;
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_HOST:
dwc3_host_exit(dwc);
break;
case DWC3_GCTL_PRTCAP_DEVICE:
dwc3_gadget_exit(dwc);
dwc3_event_buffers_cleanup(dwc);
break;
case DWC3_GCTL_PRTCAP_OTG:
dwc3_otg_exit(dwc);
spin_lock_irqsave(&dwc->lock, flags);
dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE;
spin_unlock_irqrestore(&dwc->lock, flags);
dwc3_otg_update(dwc, 1);
break;
default:
break;
}
spin_lock_irqsave(&dwc->lock, flags);
dwc3_set_prtcap(dwc, dwc->desired_dr_role);
spin_unlock_irqrestore(&dwc->lock, flags);
switch (dwc->desired_dr_role) {
case DWC3_GCTL_PRTCAP_HOST:
ret = dwc3_host_init(dwc);
if (ret) {
dev_err(dwc->dev, "failed to initialize host\n");
} else {
if (dwc->usb2_phy)
otg_set_vbus(dwc->usb2_phy->otg, true);
phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
}
break;
case DWC3_GCTL_PRTCAP_DEVICE:
dwc3_event_buffers_setup(dwc);
if (dwc->usb2_phy)
otg_set_vbus(dwc->usb2_phy->otg, false);
phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
ret = dwc3_gadget_init(dwc);
if (ret)
dev_err(dwc->dev, "failed to initialize peripheral\n");
break;
case DWC3_GCTL_PRTCAP_OTG:
dwc3_otg_init(dwc);
dwc3_otg_update(dwc, 0);
break;
default:
break;
}
}
void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
{
unsigned long flags;
spin_lock_irqsave(&dwc->lock, flags);
dwc->desired_dr_role = mode;
spin_unlock_irqrestore(&dwc->lock, flags);
queue_work(system_freezable_wq, &dwc->drd_work);
}
u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)
{
struct dwc3 *dwc = dep->dwc;
u32 reg;
dwc3_writel(dwc->regs, DWC3_GDBGFIFOSPACE,
DWC3_GDBGFIFOSPACE_NUM(dep->number) |
DWC3_GDBGFIFOSPACE_TYPE(type));
reg = dwc3_readl(dwc->regs, DWC3_GDBGFIFOSPACE);
return DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(reg);
}
/**
* dwc3_core_soft_reset - Issues core soft reset and PHY reset
* @dwc: pointer to our context structure
*/
static int dwc3_core_soft_reset(struct dwc3 *dwc)
{
u32 reg;
int retries = 1000;
int ret;
usb_phy_init(dwc->usb2_phy);
usb_phy_init(dwc->usb3_phy);
ret = phy_init(dwc->usb2_generic_phy);
if (ret < 0)
return ret;
ret = phy_init(dwc->usb3_generic_phy);
if (ret < 0) {
phy_exit(dwc->usb2_generic_phy);
return ret;
}
/*
* We're resetting only the device side because, if we're in host mode,
* XHCI driver will reset the host block. If dwc3 was configured for
* host-only mode, then we can return early.
*/
if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
return 0;
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg |= DWC3_DCTL_CSFTRST;
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
/*
* For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit
* is cleared only after all the clocks are synchronized. This can
* take a little more than 50ms. Set the polling rate at 20ms
* for 10 times instead.
*/
if (dwc3_is_usb31(dwc) && dwc->revision >= DWC3_USB31_REVISION_190A)
retries = 10;
do {
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (!(reg & DWC3_DCTL_CSFTRST))
goto done;
if (dwc3_is_usb31(dwc) &&
dwc->revision >= DWC3_USB31_REVISION_190A)
msleep(20);
else
udelay(1);
} while (--retries);
phy_exit(dwc->usb3_generic_phy);
phy_exit(dwc->usb2_generic_phy);
return -ETIMEDOUT;
done:
/*
* For DWC_usb31 controller 1.80a and prior, once DCTL.CSFRST bit
* is cleared, we must wait at least 50ms before accessing the PHY
* domain (synchronization delay).
*/
if (dwc3_is_usb31(dwc) && dwc->revision <= DWC3_USB31_REVISION_180A)
msleep(50);
return 0;
}
static const struct clk_bulk_data dwc3_core_clks[] = {
{ .id = "ref" },
{ .id = "bus_early" },
{ .id = "suspend" },
};
/*
* dwc3_frame_length_adjustment - Adjusts frame length if required
* @dwc3: Pointer to our controller context structure
*/
static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
{
u32 reg;
u32 dft;
if (dwc->revision < DWC3_REVISION_250A)
return;
if (dwc->fladj == 0)
return;
reg = dwc3_readl(dwc->regs, DWC3_GFLADJ);
dft = reg & DWC3_GFLADJ_30MHZ_MASK;
if (dft != dwc->fladj) {
reg &= ~DWC3_GFLADJ_30MHZ_MASK;
reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | dwc->fladj;
dwc3_writel(dwc->regs, DWC3_GFLADJ, reg);
}
}
/**
* dwc3_free_one_event_buffer - Frees one event buffer
* @dwc: Pointer to our controller context structure
* @evt: Pointer to event buffer to be freed
*/
static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
struct dwc3_event_buffer *evt)
{
dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
}
/**
* dwc3_alloc_one_event_buffer - Allocates one event buffer structure
* @dwc: Pointer to our controller context structure
* @length: size of the event buffer
*
* Returns a pointer to the allocated event buffer structure on success
* otherwise ERR_PTR(errno).
*/
static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
unsigned length)
{
struct dwc3_event_buffer *evt;
evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL);
if (!evt)
return ERR_PTR(-ENOMEM);
evt->dwc = dwc;
evt->length = length;
evt->cache = devm_kzalloc(dwc->dev, length, GFP_KERNEL);
if (!evt->cache)
return ERR_PTR(-ENOMEM);
evt->buf = dma_alloc_coherent(dwc->sysdev, length,
&evt->dma, GFP_KERNEL);
if (!evt->buf)
return ERR_PTR(-ENOMEM);
return evt;
}
/**
* dwc3_free_event_buffers - frees all allocated event buffers
* @dwc: Pointer to our controller context structure
*/
static void dwc3_free_event_buffers(struct dwc3 *dwc)
{
struct dwc3_event_buffer *evt;
evt = dwc->ev_buf;
if (evt)
dwc3_free_one_event_buffer(dwc, evt);
}
/**
* dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
* @dwc: pointer to our controller context structure
* @length: size of event buffer
*
* Returns 0 on success otherwise negative errno. In the error case, dwc
* may contain some buffers allocated but not all which were requested.
*/
static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)
{
struct dwc3_event_buffer *evt;
evt = dwc3_alloc_one_event_buffer(dwc, length);
if (IS_ERR(evt)) {
dev_err(dwc->dev, "can't allocate event buffer\n");
return PTR_ERR(evt);
}
dwc->ev_buf = evt;
return 0;
}
/**
* dwc3_event_buffers_setup - setup our allocated event buffers
* @dwc: pointer to our controller context structure
*
* Returns 0 on success otherwise negative errno.
*/
int dwc3_event_buffers_setup(struct dwc3 *dwc)
{
struct dwc3_event_buffer *evt;
evt = dwc->ev_buf;
evt->lpos = 0;
dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0),
lower_32_bits(evt->dma));
dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0),
upper_32_bits(evt->dma));
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
DWC3_GEVNTSIZ_SIZE(evt->length));
dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
return 0;
}
void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
{
struct dwc3_event_buffer *evt;
evt = dwc->ev_buf;
evt->lpos = 0;
dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 0);
dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 0);
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), DWC3_GEVNTSIZ_INTMASK
| DWC3_GEVNTSIZ_SIZE(0));
dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
}
static int dwc3_alloc_scratch_buffers(struct dwc3 *dwc)
{
if (!dwc->has_hibernation)
return 0;
if (!dwc->nr_scratch)
return 0;
dwc->scratchbuf = kmalloc_array(dwc->nr_scratch,
DWC3_SCRATCHBUF_SIZE, GFP_KERNEL);
if (!dwc->scratchbuf)
return -ENOMEM;
return 0;
}
static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
{
dma_addr_t scratch_addr;
u32 param;
int ret;
if (!dwc->has_hibernation)
return 0;
if (!dwc->nr_scratch)
return 0;
/* should never fall here */
if (!WARN_ON(dwc->scratchbuf))
return 0;
scratch_addr = dma_map_single(dwc->sysdev, dwc->scratchbuf,
dwc->nr_scratch * DWC3_SCRATCHBUF_SIZE,
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dwc->sysdev, scratch_addr)) {
dev_err(dwc->sysdev, "failed to map scratch buffer\n");
ret = -EFAULT;
goto err0;
}
dwc->scratch_addr = scratch_addr;
param = lower_32_bits(scratch_addr);
ret = dwc3_send_gadget_generic_command(dwc,
DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO, param);
if (ret < 0)
goto err1;
param = upper_32_bits(scratch_addr);
ret = dwc3_send_gadget_generic_command(dwc,
DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI, param);
if (ret < 0)
goto err1;
return 0;
err1:
dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
err0:
return ret;
}
static void dwc3_free_scratch_buffers(struct dwc3 *dwc)
{
if (!dwc->has_hibernation)
return;
if (!dwc->nr_scratch)
return;
/* should never fall here */
if (!WARN_ON(dwc->scratchbuf))
return;
dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
kfree(dwc->scratchbuf);
}
static void dwc3_core_num_eps(struct dwc3 *dwc)
{
struct dwc3_hwparams *parms = &dwc->hwparams;
dwc->num_eps = DWC3_NUM_EPS(parms);
}
static void dwc3_cache_hwparams(struct dwc3 *dwc)
{
struct dwc3_hwparams *parms = &dwc->hwparams;
parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
}
static int dwc3_core_ulpi_init(struct dwc3 *dwc)
{
int intf;
int ret = 0;
intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3);
if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI ||
(intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI &&
dwc->hsphy_interface &&
!strncmp(dwc->hsphy_interface, "ulpi", 4)))
ret = dwc3_ulpi_init(dwc);
return ret;
}
/**
* dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
* @dwc: Pointer to our controller context structure
*
* Returns 0 on success. The USB PHY interfaces are configured but not
* initialized. The PHY interfaces and the PHYs get initialized together with
* the core in dwc3_core_init.
*/
static int dwc3_phy_setup(struct dwc3 *dwc)
{
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
/*
* Make sure UX_EXIT_PX is cleared as that causes issues with some
* PHYs. Also, this bit is not supposed to be used in normal operation.
*/
reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX;
/*
* Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY
* to '0' during coreConsultant configuration. So default value
* will be '0' when the core is reset. Application needs to set it
* to '1' after the core initialization is completed.
*/
if (dwc->revision > DWC3_REVISION_194A)
reg |= DWC3_GUSB3PIPECTL_SUSPHY;
if (dwc->u2ss_inp3_quirk)
reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
if (dwc->dis_rxdet_inp3_quirk)
reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3;
if (dwc->req_p1p2p3_quirk)
reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
if (dwc->del_p1p2p3_quirk)
reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN;
if (dwc->del_phy_power_chg_quirk)
reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE;
if (dwc->lfps_filter_quirk)
reg |= DWC3_GUSB3PIPECTL_LFPSFILT;
if (dwc->rx_detect_poll_quirk)
reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL;
if (dwc->tx_de_emphasis_quirk)
reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis);
if (dwc->dis_u3_susphy_quirk)
reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
if (dwc->dis_del_phy_power_chg_quirk)
reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE;
dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
/* Select the HS PHY interface */
switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
if (dwc->hsphy_interface &&
!strncmp(dwc->hsphy_interface, "utmi", 4)) {
reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI;
break;
} else if (dwc->hsphy_interface &&
!strncmp(dwc->hsphy_interface, "ulpi", 4)) {
reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
} else {
/* Relying on default value. */
if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI))
break;
}
/* FALLTHROUGH */
case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
/* FALLTHROUGH */
default:
break;
}
switch (dwc->hsphy_mode) {
case USBPHY_INTERFACE_MODE_UTMI:
reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) |
DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT);
break;
case USBPHY_INTERFACE_MODE_UTMIW:
reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_16_BIT) |
DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT);
break;
default:
break;
}
/*
* Above 1.94a, it is recommended to set DWC3_GUSB2PHYCFG_SUSPHY to
* '0' during coreConsultant configuration. So default value will
* be '0' when the core is reset. Application needs to set it to
* '1' after the core initialization is completed.
*/
if (dwc->revision > DWC3_REVISION_194A)
reg |= DWC3_GUSB2PHYCFG_SUSPHY;
if (dwc->dis_u2_susphy_quirk)
reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
if (dwc->dis_enblslpm_quirk)
reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
else
reg |= DWC3_GUSB2PHYCFG_ENBLSLPM;
if (dwc->dis_u2_freeclk_exists_quirk)
reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
return 0;
}
static void dwc3_core_exit(struct dwc3 *dwc)
{
dwc3_event_buffers_cleanup(dwc);
usb_phy_shutdown(dwc->usb2_phy);
usb_phy_shutdown(dwc->usb3_phy);
phy_exit(dwc->usb2_generic_phy);
phy_exit(dwc->usb3_generic_phy);
usb_phy_set_suspend(dwc->usb2_phy, 1);
usb_phy_set_suspend(dwc->usb3_phy, 1);
phy_power_off(dwc->usb2_generic_phy);
phy_power_off(dwc->usb3_generic_phy);
clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
reset_control_assert(dwc->reset);
}
static bool dwc3_core_is_valid(struct dwc3 *dwc)
{
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
/* This should read as U3 followed by revision number */
if ((reg & DWC3_GSNPSID_MASK) == 0x55330000) {
/* Detected DWC_usb3 IP */
dwc->revision = reg;
} else if ((reg & DWC3_GSNPSID_MASK) == 0x33310000) {
/* Detected DWC_usb31 IP */
dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER);
dwc->revision |= DWC3_REVISION_IS_DWC31;
dwc->version_type = dwc3_readl(dwc->regs, DWC3_VER_TYPE);
} else {
return false;
}
return true;
}
static void dwc3_core_setup_global_control(struct dwc3 *dwc)
{
u32 hwparams4 = dwc->hwparams.hwparams4;
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_GCTL);
reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
/**
* WORKAROUND: DWC3 revisions between 2.10a and 2.50a have an
* issue which would cause xHCI compliance tests to fail.
*
* Because of that we cannot enable clock gating on such
* configurations.
*
* Refers to:
*
* STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based
* SOF/ITP Mode Used
*/
if ((dwc->dr_mode == USB_DR_MODE_HOST ||
dwc->dr_mode == USB_DR_MODE_OTG) &&
(dwc->revision >= DWC3_REVISION_210A &&
dwc->revision <= DWC3_REVISION_250A))
reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC;
else
reg &= ~DWC3_GCTL_DSBLCLKGTNG;
break;
case DWC3_GHWPARAMS1_EN_PWROPT_HIB:
/* enable hibernation here */
dwc->nr_scratch = DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(hwparams4);
/*
* REVISIT Enabling this bit so that host-mode hibernation
* will work. Device-mode hibernation is not yet implemented.
*/
reg |= DWC3_GCTL_GBLHIBERNATIONEN;
break;
default:
/* nothing */
break;
}
/* check if current dwc3 is on simulation board */
if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) {
dev_info(dwc->dev, "Running with FPGA optimizations\n");
dwc->is_fpga = true;
}
WARN_ONCE(dwc->disable_scramble_quirk && !dwc->is_fpga,
"disable_scramble cannot be used on non-FPGA builds\n");
if (dwc->disable_scramble_quirk && dwc->is_fpga)
reg |= DWC3_GCTL_DISSCRAMBLE;
else
reg &= ~DWC3_GCTL_DISSCRAMBLE;
if (dwc->u2exit_lfps_quirk)
reg |= DWC3_GCTL_U2EXIT_LFPS;
/*
* WORKAROUND: DWC3 revisions <1.90a have a bug
* where the device can fail to connect at SuperSpeed
* and falls back to high-speed mode which causes
* the device to enter a Connect/Disconnect loop
*/
if (dwc->revision < DWC3_REVISION_190A)
reg |= DWC3_GCTL_U2RSTECN;
dwc3_writel(dwc->regs, DWC3_GCTL, reg);
}
static int dwc3_core_get_phy(struct dwc3 *dwc);
static int dwc3_core_ulpi_init(struct dwc3 *dwc);
/* set global incr burst type configuration registers */
static void dwc3_set_incr_burst_type(struct dwc3 *dwc)
{
struct device *dev = dwc->dev;
/* incrx_mode : for INCR burst type. */
bool incrx_mode;
/* incrx_size : for size of INCRX burst. */
u32 incrx_size;
u32 *vals;
u32 cfg;
int ntype;
int ret;
int i;
cfg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0);
/*
* Handle property "snps,incr-burst-type-adjustment".
* Get the number of value from this property:
* result <= 0, means this property is not supported.
* result = 1, means INCRx burst mode supported.
* result > 1, means undefined length burst mode supported.
*/
ntype = device_property_count_u32(dev, "snps,incr-burst-type-adjustment");
if (ntype <= 0)
return;
vals = kcalloc(ntype, sizeof(u32), GFP_KERNEL);
if (!vals) {
dev_err(dev, "Error to get memory\n");
return;
}
/* Get INCR burst type, and parse it */
ret = device_property_read_u32_array(dev,
"snps,incr-burst-type-adjustment", vals, ntype);
if (ret) {
kfree(vals);
dev_err(dev, "Error to get property\n");
return;
}
incrx_size = *vals;
if (ntype > 1) {
/* INCRX (undefined length) burst mode */
incrx_mode = INCRX_UNDEF_LENGTH_BURST_MODE;
for (i = 1; i < ntype; i++) {
if (vals[i] > incrx_size)
incrx_size = vals[i];
}
} else {
/* INCRX burst mode */
incrx_mode = INCRX_BURST_MODE;
}
kfree(vals);
/* Enable Undefined Length INCR Burst and Enable INCRx Burst */
cfg &= ~DWC3_GSBUSCFG0_INCRBRST_MASK;
if (incrx_mode)
cfg |= DWC3_GSBUSCFG0_INCRBRSTENA;
switch (incrx_size) {
case 256:
cfg |= DWC3_GSBUSCFG0_INCR256BRSTENA;
break;
case 128:
cfg |= DWC3_GSBUSCFG0_INCR128BRSTENA;
break;
case 64:
cfg |= DWC3_GSBUSCFG0_INCR64BRSTENA;
break;
case 32:
cfg |= DWC3_GSBUSCFG0_INCR32BRSTENA;
break;
case 16:
cfg |= DWC3_GSBUSCFG0_INCR16BRSTENA;
break;
case 8:
cfg |= DWC3_GSBUSCFG0_INCR8BRSTENA;
break;
case 4:
cfg |= DWC3_GSBUSCFG0_INCR4BRSTENA;
break;
case 1:
break;
default:
dev_err(dev, "Invalid property\n");
break;
}
dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg);
}
/**
* dwc3_core_init - Low-level initialization of DWC3 Core
* @dwc: Pointer to our controller context structure
*
* Returns 0 on success otherwise negative errno.
*/
static int dwc3_core_init(struct dwc3 *dwc)
{
u32 reg;
int ret;
/*
* Write Linux Version Code to our GUID register so it's easy to figure
* out which kernel version a bug was found.
*/
dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
/* Handle USB2.0-only core configuration */
if (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
DWC3_GHWPARAMS3_SSPHY_IFC_DIS) {
if (dwc->maximum_speed == USB_SPEED_SUPER)
dwc->maximum_speed = USB_SPEED_HIGH;
}
ret = dwc3_phy_setup(dwc);
if (ret)
goto err0;
if (!dwc->ulpi_ready) {
ret = dwc3_core_ulpi_init(dwc);
if (ret)
goto err0;
dwc->ulpi_ready = true;
}
if (!dwc->phys_ready) {
ret = dwc3_core_get_phy(dwc);
if (ret)
goto err0a;
dwc->phys_ready = true;
}
ret = dwc3_core_soft_reset(dwc);
if (ret)
goto err0a;
dwc3_core_setup_global_control(dwc);
dwc3_core_num_eps(dwc);
ret = dwc3_setup_scratch_buffers(dwc);
if (ret)
goto err1;
/* Adjust Frame Length */
dwc3_frame_length_adjustment(dwc);
dwc3_set_incr_burst_type(dwc);
usb_phy_set_suspend(dwc->usb2_phy, 0);
usb_phy_set_suspend(dwc->usb3_phy, 0);
ret = phy_power_on(dwc->usb2_generic_phy);
if (ret < 0)
goto err2;
ret = phy_power_on(dwc->usb3_generic_phy);
if (ret < 0)
goto err3;
ret = dwc3_event_buffers_setup(dwc);
if (ret) {
dev_err(dwc->dev, "failed to setup event buffers\n");
goto err4;
}
/*
* ENDXFER polling is available on version 3.10a and later of
* the DWC_usb3 controller. It is NOT available in the
* DWC_usb31 controller.
*/
if (!dwc3_is_usb31(dwc) && dwc->revision >= DWC3_REVISION_310A) {
reg = dwc3_readl(dwc->regs, DWC3_GUCTL2);
reg |= DWC3_GUCTL2_RST_ACTBITLATER;
dwc3_writel(dwc->regs, DWC3_GUCTL2, reg);
}
if (dwc->revision >= DWC3_REVISION_250A) {
reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
/*
* Enable hardware control of sending remote wakeup
* in HS when the device is in the L1 state.
*/
if (dwc->revision >= DWC3_REVISION_290A)
reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW;
if (dwc->dis_tx_ipgap_linecheck_quirk)
reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS;
dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
}
if (dwc->dr_mode == USB_DR_MODE_HOST ||
dwc->dr_mode == USB_DR_MODE_OTG) {
reg = dwc3_readl(dwc->regs, DWC3_GUCTL);
/*
* Enable Auto retry Feature to make the controller operating in
* Host mode on seeing transaction errors(CRC errors or internal
* overrun scenerios) on IN transfers to reply to the device
* with a non-terminating retry ACK (i.e, an ACK transcation
* packet with Retry=1 & Nump != 0)
*/
reg |= DWC3_GUCTL_HSTINAUTORETRY;
dwc3_writel(dwc->regs, DWC3_GUCTL, reg);
}
/*
* Must config both number of packets and max burst settings to enable
* RX and/or TX threshold.
*/
if (dwc3_is_usb31(dwc) && dwc->dr_mode == USB_DR_MODE_HOST) {
u8 rx_thr_num = dwc->rx_thr_num_pkt_prd;
u8 rx_maxburst = dwc->rx_max_burst_prd;
u8 tx_thr_num = dwc->tx_thr_num_pkt_prd;
u8 tx_maxburst = dwc->tx_max_burst_prd;
if (rx_thr_num && rx_maxburst) {
reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
reg |= DWC31_RXTHRNUMPKTSEL_PRD;
reg &= ~DWC31_RXTHRNUMPKT_PRD(~0);
reg |= DWC31_RXTHRNUMPKT_PRD(rx_thr_num);
reg &= ~DWC31_MAXRXBURSTSIZE_PRD(~0);
reg |= DWC31_MAXRXBURSTSIZE_PRD(rx_maxburst);
dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
}
if (tx_thr_num && tx_maxburst) {
reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
reg |= DWC31_TXTHRNUMPKTSEL_PRD;
reg &= ~DWC31_TXTHRNUMPKT_PRD(~0);
reg |= DWC31_TXTHRNUMPKT_PRD(tx_thr_num);
reg &= ~DWC31_MAXTXBURSTSIZE_PRD(~0);
reg |= DWC31_MAXTXBURSTSIZE_PRD(tx_maxburst);
dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
}
}
return 0;
err4:
phy_power_off(dwc->usb3_generic_phy);
err3:
phy_power_off(dwc->usb2_generic_phy);
err2:
usb_phy_set_suspend(dwc->usb2_phy, 1);
usb_phy_set_suspend(dwc->usb3_phy, 1);
err1:
usb_phy_shutdown(dwc->usb2_phy);
usb_phy_shutdown(dwc->usb3_phy);
phy_exit(dwc->usb2_generic_phy);
phy_exit(dwc->usb3_generic_phy);
err0a:
dwc3_ulpi_exit(dwc);
err0:
return ret;
}
static int dwc3_core_get_phy(struct dwc3 *dwc)
{
struct device *dev = dwc->dev;
struct device_node *node = dev->of_node;
int ret;
if (node) {
dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
} else {
dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
}
if (IS_ERR(dwc->usb2_phy)) {
ret = PTR_ERR(dwc->usb2_phy);
if (ret == -ENXIO || ret == -ENODEV) {
dwc->usb2_phy = NULL;
} else if (ret == -EPROBE_DEFER) {
return ret;
} else {
dev_err(dev, "no usb2 phy configured\n");
return ret;
}
}
if (IS_ERR(dwc->usb3_phy)) {
ret = PTR_ERR(dwc->usb3_phy);
if (ret == -ENXIO || ret == -ENODEV) {
dwc->usb3_phy = NULL;
} else if (ret == -EPROBE_DEFER) {
return ret;
} else {
dev_err(dev, "no usb3 phy configured\n");
return ret;
}
}
dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
if (IS_ERR(dwc->usb2_generic_phy)) {
ret = PTR_ERR(dwc->usb2_generic_phy);
if (ret == -ENOSYS || ret == -ENODEV) {
dwc->usb2_generic_phy = NULL;
} else if (ret == -EPROBE_DEFER) {
return ret;
} else {
dev_err(dev, "no usb2 phy configured\n");
return ret;
}
}
dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
if (IS_ERR(dwc->usb3_generic_phy)) {
ret = PTR_ERR(dwc->usb3_generic_phy);
if (ret == -ENOSYS || ret == -ENODEV) {
dwc->usb3_generic_phy = NULL;
} else if (ret == -EPROBE_DEFER) {
return ret;
} else {
dev_err(dev, "no usb3 phy configured\n");
return ret;
}
}
return 0;
}
static int dwc3_core_init_mode(struct dwc3 *dwc)
{
struct device *dev = dwc->dev;
int ret;
switch (dwc->dr_mode) {
case USB_DR_MODE_PERIPHERAL:
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
if (dwc->usb2_phy)
otg_set_vbus(dwc->usb2_phy->otg, false);
phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
ret = dwc3_gadget_init(dwc);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to initialize gadget\n");
return ret;
}
break;
case USB_DR_MODE_HOST:
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
if (dwc->usb2_phy)
otg_set_vbus(dwc->usb2_phy->otg, true);
phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
ret = dwc3_host_init(dwc);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to initialize host\n");
return ret;
}
break;
case USB_DR_MODE_OTG:
INIT_WORK(&dwc->drd_work, __dwc3_set_mode);
ret = dwc3_drd_init(dwc);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to initialize dual-role\n");
return ret;
}
break;
default:
dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
return -EINVAL;
}
return 0;
}
static void dwc3_core_exit_mode(struct dwc3 *dwc)
{
switch (dwc->dr_mode) {
case USB_DR_MODE_PERIPHERAL:
dwc3_gadget_exit(dwc);
break;
case USB_DR_MODE_HOST:
dwc3_host_exit(dwc);
break;
case USB_DR_MODE_OTG:
dwc3_drd_exit(dwc);
break;
default:
/* do nothing */
break;
}
/* de-assert DRVVBUS for HOST and OTG mode */
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
}
static void dwc3_get_properties(struct dwc3 *dwc)
{
struct device *dev = dwc->dev;
u8 lpm_nyet_threshold;
u8 tx_de_emphasis;
u8 hird_threshold;
u8 rx_thr_num_pkt_prd;
u8 rx_max_burst_prd;
u8 tx_thr_num_pkt_prd;
u8 tx_max_burst_prd;
/* default to highest possible threshold */
lpm_nyet_threshold = 0xf;
/* default to -3.5dB de-emphasis */
tx_de_emphasis = 1;
/*
* default to assert utmi_sleep_n and use maximum allowed HIRD
* threshold value of 0b1100
*/
hird_threshold = 12;
dwc->maximum_speed = usb_get_maximum_speed(dev);
dwc->dr_mode = usb_get_dr_mode(dev);
dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node);
dwc->sysdev_is_parent = device_property_read_bool(dev,
"linux,sysdev_is_parent");
if (dwc->sysdev_is_parent)
dwc->sysdev = dwc->dev->parent;
else
dwc->sysdev = dwc->dev;
dwc->has_lpm_erratum = device_property_read_bool(dev,
"snps,has-lpm-erratum");
device_property_read_u8(dev, "snps,lpm-nyet-threshold",
&lpm_nyet_threshold);
dwc->is_utmi_l1_suspend = device_property_read_bool(dev,
"snps,is-utmi-l1-suspend");
device_property_read_u8(dev, "snps,hird-threshold",
&hird_threshold);
dwc->dis_start_transfer_quirk = device_property_read_bool(dev,
"snps,dis-start-transfer-quirk");
dwc->usb3_lpm_capable = device_property_read_bool(dev,
"snps,usb3_lpm_capable");
dwc->usb2_lpm_disable = device_property_read_bool(dev,
"snps,usb2-lpm-disable");
device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
&rx_thr_num_pkt_prd);
device_property_read_u8(dev, "snps,rx-max-burst-prd",
&rx_max_burst_prd);
device_property_read_u8(dev, "snps,tx-thr-num-pkt-prd",
&tx_thr_num_pkt_prd);
device_property_read_u8(dev, "snps,tx-max-burst-prd",
&tx_max_burst_prd);
dwc->disable_scramble_quirk = device_property_read_bool(dev,
"snps,disable_scramble_quirk");
dwc->u2exit_lfps_quirk = device_property_read_bool(dev,
"snps,u2exit_lfps_quirk");
dwc->u2ss_inp3_quirk = device_property_read_bool(dev,
"snps,u2ss_inp3_quirk");
dwc->req_p1p2p3_quirk = device_property_read_bool(dev,
"snps,req_p1p2p3_quirk");
dwc->del_p1p2p3_quirk = device_property_read_bool(dev,
"snps,del_p1p2p3_quirk");
dwc->del_phy_power_chg_quirk = device_property_read_bool(dev,
"snps,del_phy_power_chg_quirk");
dwc->lfps_filter_quirk = device_property_read_bool(dev,
"snps,lfps_filter_quirk");
dwc->rx_detect_poll_quirk = device_property_read_bool(dev,
"snps,rx_detect_poll_quirk");
dwc->dis_u3_susphy_quirk = device_property_read_bool(dev,
"snps,dis_u3_susphy_quirk");
dwc->dis_u2_susphy_quirk = device_property_read_bool(dev,
"snps,dis_u2_susphy_quirk");
dwc->dis_enblslpm_quirk = device_property_read_bool(dev,
"snps,dis_enblslpm_quirk");
dwc->dis_u1_entry_quirk = device_property_read_bool(dev,
"snps,dis-u1-entry-quirk");
dwc->dis_u2_entry_quirk = device_property_read_bool(dev,
"snps,dis-u2-entry-quirk");
dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,
"snps,dis_rxdet_inp3_quirk");
dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev,
"snps,dis-u2-freeclk-exists-quirk");
dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev,
"snps,dis-del-phy-power-chg-quirk");
dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev,
"snps,dis-tx-ipgap-linecheck-quirk");
dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
"snps,tx_de_emphasis_quirk");
device_property_read_u8(dev, "snps,tx_de_emphasis",
&tx_de_emphasis);
device_property_read_string(dev, "snps,hsphy_interface",
&dwc->hsphy_interface);
device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
&dwc->fladj);
dwc->dis_metastability_quirk = device_property_read_bool(dev,
"snps,dis_metastability_quirk");
dwc->lpm_nyet_threshold = lpm_nyet_threshold;
dwc->tx_de_emphasis = tx_de_emphasis;
dwc->hird_threshold = hird_threshold;
dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd;
dwc->rx_max_burst_prd = rx_max_burst_prd;
dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd;
dwc->tx_max_burst_prd = tx_max_burst_prd;
dwc->imod_interval = 0;
}
/* check whether the core supports IMOD */
bool dwc3_has_imod(struct dwc3 *dwc)
{
return ((dwc3_is_usb3(dwc) &&
dwc->revision >= DWC3_REVISION_300A) ||
(dwc3_is_usb31(dwc) &&
dwc->revision >= DWC3_USB31_REVISION_120A));
}
static void dwc3_check_params(struct dwc3 *dwc)
{
struct device *dev = dwc->dev;
/* Check for proper value of imod_interval */
if (dwc->imod_interval && !dwc3_has_imod(dwc)) {
dev_warn(dwc->dev, "Interrupt moderation not supported\n");
dwc->imod_interval = 0;
}
/*
* Workaround for STAR 9000961433 which affects only version
* 3.00a of the DWC_usb3 core. This prevents the controller
* interrupt from being masked while handling events. IMOD
* allows us to work around this issue. Enable it for the
* affected version.
*/
if (!dwc->imod_interval &&
(dwc->revision == DWC3_REVISION_300A))
dwc->imod_interval = 1;
/* Check the maximum_speed parameter */
switch (dwc->maximum_speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
case USB_SPEED_SUPER:
case USB_SPEED_SUPER_PLUS:
break;
default:
dev_err(dev, "invalid maximum_speed parameter %d\n",
dwc->maximum_speed);
/* fall through */
case USB_SPEED_UNKNOWN:
/* default to superspeed */
dwc->maximum_speed = USB_SPEED_SUPER;
/*
* default to superspeed plus if we are capable.
*/
if (dwc3_is_usb31(dwc) &&
(DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
DWC3_GHWPARAMS3_SSPHY_IFC_GEN2))
dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
break;
}
}
static int dwc3_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res, dwc_res;
struct dwc3 *dwc;
int ret;
void __iomem *regs;
dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
if (!dwc)
return -ENOMEM;
dwc->clks = devm_kmemdup(dev, dwc3_core_clks, sizeof(dwc3_core_clks),
GFP_KERNEL);
if (!dwc->clks)
return -ENOMEM;
dwc->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "missing memory resource\n");
return -ENODEV;
}
dwc->xhci_resources[0].start = res->start;
dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
DWC3_XHCI_REGS_END;
dwc->xhci_resources[0].flags = res->flags;
dwc->xhci_resources[0].name = res->name;
/*
* Request memory region but exclude xHCI regs,
* since it will be requested by the xhci-plat driver.
*/
dwc_res = *res;
dwc_res.start += DWC3_GLOBALS_REGS_START;
regs = devm_ioremap_resource(dev, &dwc_res);
if (IS_ERR(regs))
return PTR_ERR(regs);
dwc->regs = regs;
dwc->regs_size = resource_size(&dwc_res);
dwc3_get_properties(dwc);
dwc->reset = devm_reset_control_get_optional_shared(dev, NULL);
if (IS_ERR(dwc->reset))
return PTR_ERR(dwc->reset);
if (dev->of_node) {
dwc->num_clks = ARRAY_SIZE(dwc3_core_clks);
ret = devm_clk_bulk_get(dev, dwc->num_clks, dwc->clks);
if (ret == -EPROBE_DEFER)
return ret;
/*
* Clocks are optional, but new DT platforms should support all
* clocks as required by the DT-binding.
*/
if (ret)
dwc->num_clks = 0;
}
ret = reset_control_deassert(dwc->reset);
if (ret)
return ret;
ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks);
if (ret)
goto assert_reset;
if (!dwc3_core_is_valid(dwc)) {
dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
ret = -ENODEV;
goto disable_clks;
}
platform_set_drvdata(pdev, dwc);
dwc3_cache_hwparams(dwc);
spin_lock_init(&dwc->lock);
pm_runtime_set_active(dev);
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0)
goto err1;
pm_runtime_forbid(dev);
ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
if (ret) {
dev_err(dwc->dev, "failed to allocate event buffers\n");
ret = -ENOMEM;
goto err2;
}
ret = dwc3_get_dr_mode(dwc);
if (ret)
goto err3;
ret = dwc3_alloc_scratch_buffers(dwc);
if (ret)
goto err3;
ret = dwc3_core_init(dwc);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to initialize core: %d\n", ret);
goto err4;
}
dwc3_check_params(dwc);
ret = dwc3_core_init_mode(dwc);
if (ret)
goto err5;
dwc3_debugfs_init(dwc);
pm_runtime_put(dev);
return 0;
err5:
dwc3_event_buffers_cleanup(dwc);
dwc3_ulpi_exit(dwc);
err4:
dwc3_free_scratch_buffers(dwc);
err3:
dwc3_free_event_buffers(dwc);
err2:
pm_runtime_allow(&pdev->dev);
err1:
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
disable_clks:
clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
assert_reset:
reset_control_assert(dwc->reset);
return ret;
}
static int dwc3_remove(struct platform_device *pdev)
{
struct dwc3 *dwc = platform_get_drvdata(pdev);
pm_runtime_get_sync(&pdev->dev);
dwc3_debugfs_exit(dwc);
dwc3_core_exit_mode(dwc);
dwc3_core_exit(dwc);
dwc3_ulpi_exit(dwc);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_allow(&pdev->dev);
pm_runtime_disable(&pdev->dev);
dwc3_free_event_buffers(dwc);
dwc3_free_scratch_buffers(dwc);
return 0;
}
#ifdef CONFIG_PM
static int dwc3_core_init_for_resume(struct dwc3 *dwc)
{
int ret;
ret = reset_control_deassert(dwc->reset);
if (ret)
return ret;
ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks);
if (ret)
goto assert_reset;
ret = dwc3_core_init(dwc);
if (ret)
goto disable_clks;
return 0;
disable_clks:
clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
assert_reset:
reset_control_assert(dwc->reset);
return ret;
}
static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
{
unsigned long flags;
u32 reg;
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_DEVICE:
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_suspend(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
synchronize_irq(dwc->irq_gadget);
dwc3_core_exit(dwc);
break;
case DWC3_GCTL_PRTCAP_HOST:
if (!PMSG_IS_AUTO(msg)) {
dwc3_core_exit(dwc);
break;
}
/* Let controller to suspend HSPHY before PHY driver suspends */
if (dwc->dis_u2_susphy_quirk ||
dwc->dis_enblslpm_quirk) {
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
reg |= DWC3_GUSB2PHYCFG_ENBLSLPM |
DWC3_GUSB2PHYCFG_SUSPHY;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
/* Give some time for USB2 PHY to suspend */
usleep_range(5000, 6000);
}
phy_pm_runtime_put_sync(dwc->usb2_generic_phy);
phy_pm_runtime_put_sync(dwc->usb3_generic_phy);
break;
case DWC3_GCTL_PRTCAP_OTG:
/* do nothing during runtime_suspend */
if (PMSG_IS_AUTO(msg))
break;
if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_suspend(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
synchronize_irq(dwc->irq_gadget);
}
dwc3_otg_exit(dwc);
dwc3_core_exit(dwc);
break;
default:
/* do nothing */
break;
}
return 0;
}
static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
{
unsigned long flags;
int ret;
u32 reg;
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_DEVICE:
ret = dwc3_core_init_for_resume(dwc);
if (ret)
return ret;
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_resume(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
break;
case DWC3_GCTL_PRTCAP_HOST:
if (!PMSG_IS_AUTO(msg)) {
ret = dwc3_core_init_for_resume(dwc);
if (ret)
return ret;
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
break;
}
/* Restore GUSB2PHYCFG bits that were modified in suspend */
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
if (dwc->dis_u2_susphy_quirk)
reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
if (dwc->dis_enblslpm_quirk)
reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
phy_pm_runtime_get_sync(dwc->usb2_generic_phy);
phy_pm_runtime_get_sync(dwc->usb3_generic_phy);
break;
case DWC3_GCTL_PRTCAP_OTG:
/* nothing to do on runtime_resume */
if (PMSG_IS_AUTO(msg))
break;
ret = dwc3_core_init(dwc);
if (ret)
return ret;
dwc3_set_prtcap(dwc, dwc->current_dr_role);
dwc3_otg_init(dwc);
if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) {
dwc3_otg_host_init(dwc);
} else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_resume(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
}
break;
default:
/* do nothing */
break;
}
return 0;
}
static int dwc3_runtime_checks(struct dwc3 *dwc)
{
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_DEVICE:
if (dwc->connected)
return -EBUSY;
break;
case DWC3_GCTL_PRTCAP_HOST:
default:
/* do nothing */
break;
}
return 0;
}
static int dwc3_runtime_suspend(struct device *dev)
{
struct dwc3 *dwc = dev_get_drvdata(dev);
int ret;
if (dwc3_runtime_checks(dwc))
return -EBUSY;
ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND);
if (ret)
return ret;
device_init_wakeup(dev, true);
return 0;
}
static int dwc3_runtime_resume(struct device *dev)
{
struct dwc3 *dwc = dev_get_drvdata(dev);
int ret;
device_init_wakeup(dev, false);
ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
if (ret)
return ret;
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_DEVICE:
dwc3_gadget_process_pending_events(dwc);
break;
case DWC3_GCTL_PRTCAP_HOST:
default:
/* do nothing */
break;
}
pm_runtime_mark_last_busy(dev);
return 0;
}
static int dwc3_runtime_idle(struct device *dev)
{
struct dwc3 *dwc = dev_get_drvdata(dev);
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_DEVICE:
if (dwc3_runtime_checks(dwc))
return -EBUSY;
break;
case DWC3_GCTL_PRTCAP_HOST:
default:
/* do nothing */
break;
}
pm_runtime_mark_last_busy(dev);
pm_runtime_autosuspend(dev);
return 0;
}
#endif /* CONFIG_PM */
#ifdef CONFIG_PM_SLEEP
static int dwc3_suspend(struct device *dev)
{
struct dwc3 *dwc = dev_get_drvdata(dev);
int ret;
ret = dwc3_suspend_common(dwc, PMSG_SUSPEND);
if (ret)
return ret;
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int dwc3_resume(struct device *dev)
{
struct dwc3 *dwc = dev_get_drvdata(dev);
int ret;
pinctrl_pm_select_default_state(dev);
ret = dwc3_resume_common(dwc, PMSG_RESUME);
if (ret)
return ret;
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops dwc3_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
dwc3_runtime_idle)
};
#ifdef CONFIG_OF
static const struct of_device_id of_dwc3_match[] = {
{
.compatible = "snps,dwc3"
},
{
.compatible = "synopsys,dwc3"
},
{ },
};
MODULE_DEVICE_TABLE(of, of_dwc3_match);
#endif
#ifdef CONFIG_ACPI
#define ACPI_ID_INTEL_BSW "808622B7"
static const struct acpi_device_id dwc3_acpi_match[] = {
{ ACPI_ID_INTEL_BSW, 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match);
#endif
static struct platform_driver dwc3_driver = {
.probe = dwc3_probe,
.remove = dwc3_remove,
.driver = {
.name = "dwc3",
.of_match_table = of_match_ptr(of_dwc3_match),
.acpi_match_table = ACPI_PTR(dwc3_acpi_match),
.pm = &dwc3_dev_pm_ops,
},
};
module_platform_driver(dwc3_driver);
MODULE_ALIAS("platform:dwc3");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver");
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