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kernel-49/drivers/usb/dwc2/core_intr.c
Greg Kroah-Hartman b16ff0ab99 Merge 4.9.229 into android-4.9-q
Changes in 4.9.229
	power: supply: bq24257_charger: Replace depends on REGMAP_I2C with select
	clk: sunxi: Fix incorrect usage of round_down()
	i2c: piix4: Detect secondary SMBus controller on AMD AM4 chipsets
	iio: pressure: bmp280: Tolerate IRQ before registering
	clk: qcom: msm8916: Fix the address location of pll->config_reg
	backlight: lp855x: Ensure regulators are disabled on probe failure
	ARM: integrator: Add some Kconfig selections
	ALSA: isa/wavefront: prevent out of bounds write in ioctl
	scsi: qla2xxx: Fix issue with adapter's stopping state
	iio: bmp280: fix compensation of humidity
	i2c: pxa: clear all master action bits in i2c_pxa_stop_message()
	usblp: poison URBs upon disconnect
	PCI: aardvark: Don't blindly enable ASPM L0s and don't write to read-only register
	ps3disk: use the default segment boundary
	vfio/pci: fix memory leaks in alloc_perm_bits()
	mfd: wm8994: Fix driver operation if loaded as modules
	scsi: lpfc: Fix lpfc_nodelist leak when processing unsolicited event
	clk: clk-flexgen: fix clock-critical handling
	powerpc/perf/hv-24x7: Fix inconsistent output values incase multiple hv-24x7 events run
	nfsd: Fix svc_xprt refcnt leak when setup callback client failed
	powerpc/crashkernel: Take "mem=" option into account
	yam: fix possible memory leak in yam_init_driver
	mksysmap: Fix the mismatch of '.L' symbols in System.map
	scsi: sr: Fix sr_probe() missing deallocate of device minor
	scsi: ibmvscsi: Don't send host info in adapter info MAD after LPM
	ALSA: usb-audio: Improve frames size computation
	s390/qdio: put thinint indicator after early error
	tty: hvc: Fix data abort due to race in hvc_open
	staging: sm750fb: add missing case while setting FB_VISUAL
	i2c: pxa: fix i2c_pxa_scream_blue_murder() debug output
	serial: amba-pl011: Make sure we initialize the port.lock spinlock
	drivers: base: Fix NULL pointer exception in __platform_driver_probe() if a driver developer is foolish
	PCI: rcar: Fix incorrect programming of OB windows
	PCI/ASPM: Allow ASPM on links to PCIe-to-PCI/PCI-X Bridges
	power: supply: lp8788: Fix an error handling path in 'lp8788_charger_probe()'
	power: supply: smb347-charger: IRQSTAT_D is volatile
	scsi: mpt3sas: Fix double free warnings
	dlm: remove BUG() before panic()
	clk: ti: composite: fix memory leak
	tty: n_gsm: Fix SOF skipping
	tty: n_gsm: Fix waking up upper tty layer when room available
	powerpc/pseries/ras: Fix FWNMI_VALID off by one
	powerpc/ps3: Fix kexec shutdown hang
	vfio-pci: Mask cap zero
	usb/ohci-platform: Fix a warning when hibernating
	drm/msm/mdp5: Fix mdp5_init error path for failed mdp5_kms allocation
	USB: host: ehci-mxc: Add error handling in ehci_mxc_drv_probe()
	tty: n_gsm: Fix bogus i++ in gsm_data_kick
	clk: samsung: exynos5433: Add IGNORE_UNUSED flag to sclk_i2s1
	powerpc/64s/pgtable: fix an undefined behaviour
	PCI/PTM: Inherit Switch Downstream Port PTM settings from Upstream Port
	IB/cma: Fix ports memory leak in cma_configfs
	watchdog: da9062: No need to ping manually before setting timeout
	usb: dwc2: gadget: move gadget resume after the core is in L0 state
	USB: gadget: udc: s3c2410_udc: Remove pointless NULL check in s3c2410_udc_nuke
	usb: gadget: lpc32xx_udc: don't dereference ep pointer before null check
	usb: gadget: fix potential double-free in m66592_probe.
	usb: gadget: Fix issue with config_ep_by_speed function
	clk: bcm2835: Fix return type of bcm2835_register_gate
	net: sunrpc: Fix off-by-one issues in 'rpc_ntop6'
	NFSv4.1 fix rpc_call_done assignment for BIND_CONN_TO_SESSION
	extcon: adc-jack: Fix an error handling path in 'adc_jack_probe()'
	ASoC: fsl_asrc_dma: Fix dma_chan leak when config DMA channel failed
	openrisc: Fix issue with argument clobbering for clone/fork
	gfs2: Allow lock_nolock mount to specify jid=X
	scsi: iscsi: Fix reference count leak in iscsi_boot_create_kobj
	pinctrl: imxl: Fix an error handling path in 'imx1_pinctrl_core_probe()'
	crypto: omap-sham - add proper load balancing support for multicore
	lib/zlib: remove outdated and incorrect pre-increment optimization
	include/linux/bitops.h: avoid clang shift-count-overflow warnings
	elfnote: mark all .note sections SHF_ALLOC
	selftests/vm/pkeys: fix alloc_random_pkey() to make it really random
	selftests/net: in timestamping, strncpy needs to preserve null byte
	scsi: acornscsi: Fix an error handling path in acornscsi_probe()
	usb/xhci-plat: Set PM runtime as active on resume
	usb/ehci-platform: Set PM runtime as active on resume
	perf report: Fix NULL pointer dereference in hists__fprintf_nr_sample_events()
	bcache: fix potential deadlock problem in btree_gc_coalesce
	block: Fix use-after-free in blkdev_get()
	libata: Use per port sync for detach
	drm: encoder_slave: fix refcouting error for modules
	drm/dp_mst: Reformat drm_dp_check_act_status() a bit
	drm/qxl: Use correct notify port address when creating cursor ring
	selinux: fix double free
	ext4: fix partial cluster initialization when splitting extent
	drm/dp_mst: Increase ACT retry timeout to 3s
	x86/boot/compressed: Relax sed symbol type regex for LLVM ld.lld
	block: nr_sects_write(): Disable preemption on seqcount write
	s390: fix syscall_get_error for compat processes
	drm/i915: Whitelist context-local timestamp in the gen9 cmdparser
	crypto: algboss - don't wait during notifier callback
	kprobes: Fix to protect kick_kprobe_optimizer() by kprobe_mutex
	powerpc/kprobes: Fixes for kprobe_lookup_name() on BE
	x86/kprobes: Avoid kretprobe recursion bug
	kretprobe: Prevent triggering kretprobe from within kprobe_flush_task
	e1000e: Do not wake up the system via WOL if device wakeup is disabled
	sched/rt, net: Use CONFIG_PREEMPTION.patch
	net: core: device_rename: Use rwsem instead of a seqcount
	media: dvb_frontend: initialize variable s with FE_NONE instead of 0
	media: dvb/frontend.h: move out a private internal structure
	media: dvb/frontend.h: document the uAPI file
	media: dvb_frontend: get rid of get_property() callback
	media: stv0288: get rid of set_property boilerplate
	media: stv6110: get rid of a srate dead code
	media: friio-fe: get rid of set_property()
	media: dvb_frontend: get rid of set_property() callback
	media: dvb_frontend: cleanup dvb_frontend_ioctl_properties()
	media: dvb_frontend: cleanup ioctl handling logic
	media: dvb_frontend: get rid of property cache's state
	media: dvb_frontend: better document the -EPERM condition
	media: dvb_frontend: fix return values for FE_SET_PROPERTY
	media: dvb_frontend: dtv_property_process_set() cleanups
	media: dvb_frontend: be sure to init dvb_frontend_handle_ioctl() return code
	media: dvb_frontend: Add unlocked_ioctl in dvb_frontend.c
	media: dvb_frontend: Add compat_ioctl callback
	media: dvb_frontend: Add commands implementation for compat ioct
	media: dvb_frontend: fix wrong cast in compat_ioctl
	media: dvb_frontend: fix return error code
	mtd: rawnand: Pass a nand_chip object to nand_release()
	mtd: rawnand: diskonchip: Fix the probe error path
	mtd: rawnand: sharpsl: Fix the probe error path
	mtd: rawnand: xway: Fix the probe error path
	mtd: rawnand: orion: Fix the probe error path
	mtd: rawnand: socrates: Fix the probe error path
	mtd: rawnand: plat_nand: Fix the probe error path
	mtd: rawnand: mtk: Fix the probe error path
	mtd: rawnand: tmio: Fix the probe error path
	scsi: scsi_devinfo: handle non-terminated strings
	l2tp: Allow duplicate session creation with UDP
	net: sched: export __netdev_watchdog_up()
	fix a braino in "sparc32: fix register window handling in genregs32_[gs]et()"
	mld: fix memory leak in ipv6_mc_destroy_dev()
	net: fix memleak in register_netdevice()
	net: usb: ax88179_178a: fix packet alignment padding
	rocker: fix incorrect error handling in dma_rings_init
	rxrpc: Fix notification call on completion of discarded calls
	tg3: driver sleeps indefinitely when EEH errors exceed eeh_max_freezes
	ip_tunnel: fix use-after-free in ip_tunnel_lookup()
	tcp_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT
	ip6_gre: fix use-after-free in ip6gre_tunnel_lookup()
	tcp: grow window for OOO packets only for SACK flows
	sctp: Don't advertise IPv4 addresses if ipv6only is set on the socket
	net: Fix the arp error in some cases
	net: Do not clear the sock TX queue in sk_set_socket()
	net: core: reduce recursion limit value
	USB: ohci-sm501: Add missed iounmap() in remove
	usb: dwc2: Postponed gadget registration to the udc class driver
	usb: add USB_QUIRK_DELAY_INIT for Logitech C922
	USB: ehci: reopen solution for Synopsys HC bug
	usb: host: ehci-exynos: Fix error check in exynos_ehci_probe()
	ALSA: usb-audio: add quirk for Denon DCD-1500RE
	xhci: Fix incorrect EP_STATE_MASK
	xhci: Fix enumeration issue when setting max packet size for FS devices.
	cdc-acm: Add DISABLE_ECHO quirk for Microchip/SMSC chip
	ALSA: usb-audio: uac1: Invalidate ctl on interrupt
	ALSA: usb-audio: Clean up mixer element list traverse
	ALSA: usb-audio: Fix OOB access of mixer element list
	xhci: Poll for U0 after disabling USB2 LPM
	cifs/smb3: Fix data inconsistent when punch hole
	cifs/smb3: Fix data inconsistent when zero file range
	efi/esrt: Fix reference count leak in esre_create_sysfs_entry.
	RDMA/mad: Fix possible memory leak in ib_mad_post_receive_mads()
	net: qed: fix left elements count calculation
	net: qed: fix NVMe login fails over VFs
	net: qed: fix excessive QM ILT lines consumption
	ARM: imx5: add missing put_device() call in imx_suspend_alloc_ocram()
	usb: gadget: udc: Potential Oops in error handling code
	netfilter: ipset: fix unaligned atomic access
	sched/core: Fix PI boosting between RT and DEADLINE tasks
	ata/libata: Fix usage of page address by page_address in ata_scsi_mode_select_xlat function
	net: alx: fix race condition in alx_remove
	s390/ptrace: fix setting syscall number
	kbuild: improve cc-option to clean up all temporary files
	blktrace: break out of blktrace setup on concurrent calls
	ALSA: hda: Add NVIDIA codec IDs 9a & 9d through a0 to patch table
	ACPI: sysfs: Fix pm_profile_attr type
	KVM: X86: Fix MSR range of APIC registers in X2APIC mode
	mm/slab: use memzero_explicit() in kzfree()
	ocfs2: load global_inode_alloc
	ocfs2: fix value of OCFS2_INVALID_SLOT
	ocfs2: fix panic on nfs server over ocfs2
	arm64: perf: Report the PC value in REGS_ABI_32 mode
	tracing: Fix event trigger to accept redundant spaces
	drm/radeon: fix fb_div check in ni_init_smc_spll_table()
	sunrpc: fixed rollback in rpc_gssd_dummy_populate()
	SUNRPC: Properly set the @subbuf parameter of xdr_buf_subsegment()
	pNFS/flexfiles: Fix list corruption if the mirror count changes
	NFSv4 fix CLOSE not waiting for direct IO compeletion
	xfs: add agf freeblocks verify in xfs_agf_verify
	Revert "tty: hvc: Fix data abort due to race in hvc_open"
	Linux 4.9.229

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I0ce84c8f4c2c437fee36399c358c3dcc19fdfc1d
2020-07-09 21:01:12 +03:00

577 lines
16 KiB
C

/*
* core_intr.c - DesignWare HS OTG Controller common interrupt handling
*
* Copyright (C) 2004-2013 Synopsys, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the above-listed copyright holders may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file contains the common interrupt handlers
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/ch11.h>
#include "core.h"
#include "hcd.h"
static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg)
{
switch (hsotg->op_state) {
case OTG_STATE_A_HOST:
return "a_host";
case OTG_STATE_A_SUSPEND:
return "a_suspend";
case OTG_STATE_A_PERIPHERAL:
return "a_peripheral";
case OTG_STATE_B_PERIPHERAL:
return "b_peripheral";
case OTG_STATE_B_HOST:
return "b_host";
default:
return "unknown";
}
}
/**
* dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
* When the PRTINT interrupt fires, there are certain status bits in the Host
* Port that needs to get cleared.
*
* @hsotg: Programming view of DWC_otg controller
*/
static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
{
u32 hprt0 = dwc2_readl(hsotg->regs + HPRT0);
if (hprt0 & HPRT0_ENACHG) {
hprt0 &= ~HPRT0_ENA;
dwc2_writel(hprt0, hsotg->regs + HPRT0);
}
}
/**
* dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
*
* @hsotg: Programming view of DWC_otg controller
*/
static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
{
/* Clear interrupt */
dwc2_writel(GINTSTS_MODEMIS, hsotg->regs + GINTSTS);
dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
dwc2_is_host_mode(hsotg) ? "Host" : "Device");
}
/**
* dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG
* Interrupt Register (GOTGINT) to determine what interrupt has occurred.
*
* @hsotg: Programming view of DWC_otg controller
*/
static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg)
{
u32 gotgint;
u32 gotgctl;
u32 gintmsk;
gotgint = dwc2_readl(hsotg->regs + GOTGINT);
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint,
dwc2_op_state_str(hsotg));
if (gotgint & GOTGINT_SES_END_DET) {
dev_dbg(hsotg->dev,
" ++OTG Interrupt: Session End Detected++ (%s)\n",
dwc2_op_state_str(hsotg));
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
if (dwc2_is_device_mode(hsotg))
dwc2_hsotg_disconnect(hsotg);
if (hsotg->op_state == OTG_STATE_B_HOST) {
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
} else {
/*
* If not B_HOST and Device HNP still set, HNP did
* not succeed!
*/
if (gotgctl & GOTGCTL_DEVHNPEN) {
dev_dbg(hsotg->dev, "Session End Detected\n");
dev_err(hsotg->dev,
"Device Not Connected/Responding!\n");
}
/*
* If Session End Detected the B-Cable has been
* disconnected
*/
/* Reset to a clean state */
hsotg->lx_state = DWC2_L0;
}
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
gotgctl &= ~GOTGCTL_DEVHNPEN;
dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
}
if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
dev_dbg(hsotg->dev,
" ++OTG Interrupt: Session Request Success Status Change++\n");
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
if (gotgctl & GOTGCTL_SESREQSCS) {
if (hsotg->core_params->phy_type ==
DWC2_PHY_TYPE_PARAM_FS
&& hsotg->core_params->i2c_enable > 0) {
hsotg->srp_success = 1;
} else {
/* Clear Session Request */
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
gotgctl &= ~GOTGCTL_SESREQ;
dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
}
}
}
if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
/*
* Print statements during the HNP interrupt handling
* can cause it to fail
*/
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
/*
* WA for 3.00a- HW is not setting cur_mode, even sometimes
* this does not help
*/
if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a)
udelay(100);
if (gotgctl & GOTGCTL_HSTNEGSCS) {
if (dwc2_is_host_mode(hsotg)) {
hsotg->op_state = OTG_STATE_B_HOST;
/*
* Need to disable SOF interrupt immediately.
* When switching from device to host, the PCD
* interrupt handler won't handle the interrupt
* if host mode is already set. The HCD
* interrupt handler won't get called if the
* HCD state is HALT. This means that the
* interrupt does not get handled and Linux
* complains loudly.
*/
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
gintmsk &= ~GINTSTS_SOF;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
/*
* Call callback function with spin lock
* released
*/
spin_unlock(&hsotg->lock);
/* Initialize the Core for Host mode */
dwc2_hcd_start(hsotg);
spin_lock(&hsotg->lock);
hsotg->op_state = OTG_STATE_B_HOST;
}
} else {
gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
dev_dbg(hsotg->dev, "HNP Failed\n");
dev_err(hsotg->dev,
"Device Not Connected/Responding\n");
}
}
if (gotgint & GOTGINT_HST_NEG_DET) {
/*
* The disconnect interrupt is set at the same time as
* Host Negotiation Detected. During the mode switch all
* interrupts are cleared so the disconnect interrupt
* handler will not get executed.
*/
dev_dbg(hsotg->dev,
" ++OTG Interrupt: Host Negotiation Detected++ (%s)\n",
(dwc2_is_host_mode(hsotg) ? "Host" : "Device"));
if (dwc2_is_device_mode(hsotg)) {
dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n",
hsotg->op_state);
spin_unlock(&hsotg->lock);
dwc2_hcd_disconnect(hsotg, false);
spin_lock(&hsotg->lock);
hsotg->op_state = OTG_STATE_A_PERIPHERAL;
} else {
/* Need to disable SOF interrupt immediately */
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
gintmsk &= ~GINTSTS_SOF;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
spin_unlock(&hsotg->lock);
dwc2_hcd_start(hsotg);
spin_lock(&hsotg->lock);
hsotg->op_state = OTG_STATE_A_HOST;
}
}
if (gotgint & GOTGINT_A_DEV_TOUT_CHG)
dev_dbg(hsotg->dev,
" ++OTG Interrupt: A-Device Timeout Change++\n");
if (gotgint & GOTGINT_DBNCE_DONE)
dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n");
/* Clear GOTGINT */
dwc2_writel(gotgint, hsotg->regs + GOTGINT);
}
/**
* dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
* Change Interrupt
*
* @hsotg: Programming view of DWC_otg controller
*
* Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
* Device to Host Mode transition or a Host to Device Mode transition. This only
* occurs when the cable is connected/removed from the PHY connector.
*/
static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
{
u32 gintmsk;
/* Clear interrupt */
dwc2_writel(GINTSTS_CONIDSTSCHNG, hsotg->regs + GINTSTS);
/* Need to disable SOF interrupt immediately */
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
gintmsk &= ~GINTSTS_SOF;
dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++ (%s)\n",
dwc2_is_host_mode(hsotg) ? "Host" : "Device");
/*
* Need to schedule a work, as there are possible DELAY function calls.
* Release lock before scheduling workq as it holds spinlock during
* scheduling.
*/
if (hsotg->wq_otg) {
spin_unlock(&hsotg->lock);
queue_work(hsotg->wq_otg, &hsotg->wf_otg);
spin_lock(&hsotg->lock);
}
}
/**
* dwc2_handle_session_req_intr() - This interrupt indicates that a device is
* initiating the Session Request Protocol to request the host to turn on bus
* power so a new session can begin
*
* @hsotg: Programming view of DWC_otg controller
*
* This handler responds by turning on bus power. If the DWC_otg controller is
* in low power mode, this handler brings the controller out of low power mode
* before turning on bus power.
*/
static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
{
int ret;
/* Clear interrupt */
dwc2_writel(GINTSTS_SESSREQINT, hsotg->regs + GINTSTS);
dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
hsotg->lx_state);
if (dwc2_is_device_mode(hsotg)) {
if (hsotg->lx_state == DWC2_L2) {
ret = dwc2_exit_hibernation(hsotg, true);
if (ret && (ret != -ENOTSUPP))
dev_err(hsotg->dev,
"exit hibernation failed\n");
}
/*
* Report disconnect if there is any previous session
* established
*/
dwc2_hsotg_disconnect(hsotg);
}
}
/*
* This interrupt indicates that the DWC_otg controller has detected a
* resume or remote wakeup sequence. If the DWC_otg controller is in
* low power mode, the handler must brings the controller out of low
* power mode. The controller automatically begins resume signaling.
* The handler schedules a time to stop resume signaling.
*/
static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
{
int ret;
/* Clear interrupt */
dwc2_writel(GINTSTS_WKUPINT, hsotg->regs + GINTSTS);
dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
if (dwc2_is_device_mode(hsotg)) {
dev_dbg(hsotg->dev, "DSTS=0x%0x\n",
dwc2_readl(hsotg->regs + DSTS));
if (hsotg->lx_state == DWC2_L2) {
u32 dctl = dwc2_readl(hsotg->regs + DCTL);
/* Clear Remote Wakeup Signaling */
dctl &= ~DCTL_RMTWKUPSIG;
dwc2_writel(dctl, hsotg->regs + DCTL);
ret = dwc2_exit_hibernation(hsotg, true);
if (ret && (ret != -ENOTSUPP))
dev_err(hsotg->dev, "exit hibernation failed\n");
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
call_gadget(hsotg, resume);
} else {
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
}
} else {
if (hsotg->core_params->hibernation)
return;
if (hsotg->lx_state != DWC2_L1) {
u32 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
/* Restart the Phy Clock */
pcgcctl &= ~PCGCTL_STOPPCLK;
dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
mod_timer(&hsotg->wkp_timer,
jiffies + msecs_to_jiffies(71));
} else {
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
}
}
}
/*
* This interrupt indicates that a device has been disconnected from the
* root port
*/
static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
{
dwc2_writel(GINTSTS_DISCONNINT, hsotg->regs + GINTSTS);
dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
dwc2_is_host_mode(hsotg) ? "Host" : "Device",
dwc2_op_state_str(hsotg));
if (hsotg->op_state == OTG_STATE_A_HOST)
dwc2_hcd_disconnect(hsotg, false);
}
/*
* This interrupt indicates that SUSPEND state has been detected on the USB.
*
* For HNP the USB Suspend interrupt signals the change from "a_peripheral"
* to "a_host".
*
* When power management is enabled the core will be put in low power mode.
*/
static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
{
u32 dsts;
int ret;
/* Clear interrupt */
dwc2_writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS);
dev_dbg(hsotg->dev, "USB SUSPEND\n");
if (dwc2_is_device_mode(hsotg)) {
/*
* Check the Device status register to determine if the Suspend
* state is active
*/
dsts = dwc2_readl(hsotg->regs + DSTS);
dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts);
dev_dbg(hsotg->dev,
"DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n",
!!(dsts & DSTS_SUSPSTS),
hsotg->hw_params.power_optimized);
if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) {
/* Ignore suspend request before enumeration */
if (!dwc2_is_device_connected(hsotg)) {
dev_dbg(hsotg->dev,
"ignore suspend request before enumeration\n");
return;
}
ret = dwc2_enter_hibernation(hsotg);
if (ret) {
if (ret != -ENOTSUPP)
dev_err(hsotg->dev,
"enter hibernation failed\n");
goto skip_power_saving;
}
udelay(100);
/* Ask phy to be suspended */
if (!IS_ERR_OR_NULL(hsotg->uphy))
usb_phy_set_suspend(hsotg->uphy, true);
skip_power_saving:
/*
* Change to L2 (suspend) state before releasing
* spinlock
*/
hsotg->lx_state = DWC2_L2;
/* Call gadget suspend callback */
call_gadget(hsotg, suspend);
}
} else {
if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
/* Change to L2 (suspend) state */
hsotg->lx_state = DWC2_L2;
/* Clear the a_peripheral flag, back to a_host */
spin_unlock(&hsotg->lock);
dwc2_hcd_start(hsotg);
spin_lock(&hsotg->lock);
hsotg->op_state = OTG_STATE_A_HOST;
}
}
}
#define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \
GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \
GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \
GINTSTS_USBSUSP | GINTSTS_PRTINT)
/*
* This function returns the Core Interrupt register
*/
static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
{
u32 gintsts;
u32 gintmsk;
u32 gahbcfg;
u32 gintmsk_common = GINTMSK_COMMON;
gintsts = dwc2_readl(hsotg->regs + GINTSTS);
gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
gahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
/* If any common interrupts set */
if (gintsts & gintmsk_common)
dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n",
gintsts, gintmsk);
if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
return gintsts & gintmsk & gintmsk_common;
else
return 0;
}
/*
* Common interrupt handler
*
* The common interrupts are those that occur in both Host and Device mode.
* This handler handles the following interrupts:
* - Mode Mismatch Interrupt
* - OTG Interrupt
* - Connector ID Status Change Interrupt
* - Disconnect Interrupt
* - Session Request Interrupt
* - Resume / Remote Wakeup Detected Interrupt
* - Suspend Interrupt
*/
irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
{
struct dwc2_hsotg *hsotg = dev;
u32 gintsts;
irqreturn_t retval = IRQ_NONE;
spin_lock(&hsotg->lock);
if (!dwc2_is_controller_alive(hsotg)) {
dev_warn(hsotg->dev, "Controller is dead\n");
goto out;
}
gintsts = dwc2_read_common_intr(hsotg);
if (gintsts & ~GINTSTS_PRTINT)
retval = IRQ_HANDLED;
if (gintsts & GINTSTS_MODEMIS)
dwc2_handle_mode_mismatch_intr(hsotg);
if (gintsts & GINTSTS_OTGINT)
dwc2_handle_otg_intr(hsotg);
if (gintsts & GINTSTS_CONIDSTSCHNG)
dwc2_handle_conn_id_status_change_intr(hsotg);
if (gintsts & GINTSTS_DISCONNINT)
dwc2_handle_disconnect_intr(hsotg);
if (gintsts & GINTSTS_SESSREQINT)
dwc2_handle_session_req_intr(hsotg);
if (gintsts & GINTSTS_WKUPINT)
dwc2_handle_wakeup_detected_intr(hsotg);
if (gintsts & GINTSTS_USBSUSP)
dwc2_handle_usb_suspend_intr(hsotg);
if (gintsts & GINTSTS_PRTINT) {
/*
* The port interrupt occurs while in device mode with HPRT0
* Port Enable/Disable
*/
if (dwc2_is_device_mode(hsotg)) {
dev_dbg(hsotg->dev,
" --Port interrupt received in Device mode--\n");
dwc2_handle_usb_port_intr(hsotg);
retval = IRQ_HANDLED;
}
}
out:
spin_unlock(&hsotg->lock);
return retval;
}