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linux-next/drivers/usb/musb/musb_virthub.c
Greg Kroah-Hartman 21b650c236 USB: musb: Remove redundant license text
Now that the SPDX tag is in all USB files, that identifies the license
in a specific and legally-defined manner.  So the extra GPL text wording
can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Acked-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-07 15:45:01 +01:00

436 lines
11 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* MUSB OTG driver virtual root hub support
*
* Copyright 2005 Mentor Graphics Corporation
* Copyright (C) 2005-2006 by Texas Instruments
* Copyright (C) 2006-2007 Nokia Corporation
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <asm/unaligned.h>
#include "musb_core.h"
void musb_host_finish_resume(struct work_struct *work)
{
struct musb *musb;
unsigned long flags;
u8 power;
musb = container_of(work, struct musb, finish_resume_work.work);
spin_lock_irqsave(&musb->lock, flags);
power = musb_readb(musb->mregs, MUSB_POWER);
power &= ~MUSB_POWER_RESUME;
musb_dbg(musb, "root port resume stopped, power %02x", power);
musb_writeb(musb->mregs, MUSB_POWER, power);
/*
* ISSUE: DaVinci (RTL 1.300) disconnects after
* resume of high speed peripherals (but not full
* speed ones).
*/
musb->is_active = 1;
musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
usb_hcd_poll_rh_status(musb->hcd);
/* NOTE: it might really be A_WAIT_BCON ... */
musb->xceiv->otg->state = OTG_STATE_A_HOST;
spin_unlock_irqrestore(&musb->lock, flags);
}
void musb_port_suspend(struct musb *musb, bool do_suspend)
{
struct usb_otg *otg = musb->xceiv->otg;
u8 power;
void __iomem *mbase = musb->mregs;
if (!is_host_active(musb))
return;
/* NOTE: this doesn't necessarily put PHY into low power mode,
* turning off its clock; that's a function of PHY integration and
* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
* SE0 changing to connect (J) or wakeup (K) states.
*/
power = musb_readb(mbase, MUSB_POWER);
if (do_suspend) {
int retries = 10000;
power &= ~MUSB_POWER_RESUME;
power |= MUSB_POWER_SUSPENDM;
musb_writeb(mbase, MUSB_POWER, power);
/* Needed for OPT A tests */
power = musb_readb(mbase, MUSB_POWER);
while (power & MUSB_POWER_SUSPENDM) {
power = musb_readb(mbase, MUSB_POWER);
if (retries-- < 1)
break;
}
musb_dbg(musb, "Root port suspended, power %02x", power);
musb->port1_status |= USB_PORT_STAT_SUSPEND;
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_HOST:
musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
musb->is_active = otg->host->b_hnp_enable;
if (musb->is_active)
mod_timer(&musb->otg_timer, jiffies
+ msecs_to_jiffies(
OTG_TIME_A_AIDL_BDIS));
musb_platform_try_idle(musb, 0);
break;
case OTG_STATE_B_HOST:
musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
musb->is_active = otg->host->b_hnp_enable;
musb_platform_try_idle(musb, 0);
break;
default:
musb_dbg(musb, "bogus rh suspend? %s",
usb_otg_state_string(musb->xceiv->otg->state));
}
} else if (power & MUSB_POWER_SUSPENDM) {
power &= ~MUSB_POWER_SUSPENDM;
power |= MUSB_POWER_RESUME;
musb_writeb(mbase, MUSB_POWER, power);
musb_dbg(musb, "Root port resuming, power %02x", power);
musb->port1_status |= MUSB_PORT_STAT_RESUME;
schedule_delayed_work(&musb->finish_resume_work,
msecs_to_jiffies(USB_RESUME_TIMEOUT));
}
}
void musb_port_reset(struct musb *musb, bool do_reset)
{
u8 power;
void __iomem *mbase = musb->mregs;
if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
musb->port1_status &= ~USB_PORT_STAT_RESET;
return;
}
if (!is_host_active(musb))
return;
/* NOTE: caller guarantees it will turn off the reset when
* the appropriate amount of time has passed
*/
power = musb_readb(mbase, MUSB_POWER);
if (do_reset) {
/*
* If RESUME is set, we must make sure it stays minimum 20 ms.
* Then we must clear RESUME and wait a bit to let musb start
* generating SOFs. If we don't do this, OPT HS A 6.8 tests
* fail with "Error! Did not receive an SOF before suspend
* detected".
*/
if (power & MUSB_POWER_RESUME) {
long remain = (unsigned long) musb->rh_timer - jiffies;
if (musb->rh_timer > 0 && remain > 0) {
/* take into account the minimum delay after resume */
schedule_delayed_work(
&musb->deassert_reset_work, remain);
return;
}
musb_writeb(mbase, MUSB_POWER,
power & ~MUSB_POWER_RESUME);
/* Give the core 1 ms to clear MUSB_POWER_RESUME */
schedule_delayed_work(&musb->deassert_reset_work,
msecs_to_jiffies(1));
return;
}
power &= 0xf0;
musb_writeb(mbase, MUSB_POWER,
power | MUSB_POWER_RESET);
musb->port1_status |= USB_PORT_STAT_RESET;
musb->port1_status &= ~USB_PORT_STAT_ENABLE;
schedule_delayed_work(&musb->deassert_reset_work,
msecs_to_jiffies(50));
} else {
musb_dbg(musb, "root port reset stopped");
musb_platform_pre_root_reset_end(musb);
musb_writeb(mbase, MUSB_POWER,
power & ~MUSB_POWER_RESET);
musb_platform_post_root_reset_end(musb);
power = musb_readb(mbase, MUSB_POWER);
if (power & MUSB_POWER_HSMODE) {
musb_dbg(musb, "high-speed device connected");
musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
}
musb->port1_status &= ~USB_PORT_STAT_RESET;
musb->port1_status |= USB_PORT_STAT_ENABLE
| (USB_PORT_STAT_C_RESET << 16)
| (USB_PORT_STAT_C_ENABLE << 16);
usb_hcd_poll_rh_status(musb->hcd);
musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
}
}
void musb_root_disconnect(struct musb *musb)
{
struct usb_otg *otg = musb->xceiv->otg;
musb->port1_status = USB_PORT_STAT_POWER
| (USB_PORT_STAT_C_CONNECTION << 16);
usb_hcd_poll_rh_status(musb->hcd);
musb->is_active = 0;
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_SUSPEND:
if (otg->host->b_hnp_enable) {
musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
musb->g.is_a_peripheral = 1;
break;
}
/* FALLTHROUGH */
case OTG_STATE_A_HOST:
musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
musb->is_active = 0;
break;
case OTG_STATE_A_WAIT_VFALL:
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
break;
default:
musb_dbg(musb, "host disconnect (%s)",
usb_otg_state_string(musb->xceiv->otg->state));
}
}
EXPORT_SYMBOL_GPL(musb_root_disconnect);
/*---------------------------------------------------------------------*/
/* Caller may or may not hold musb->lock */
int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct musb *musb = hcd_to_musb(hcd);
int retval = 0;
/* called in_irq() via usb_hcd_poll_rh_status() */
if (musb->port1_status & 0xffff0000) {
*buf = 0x02;
retval = 1;
}
return retval;
}
static int musb_has_gadget(struct musb *musb)
{
/*
* In host-only mode we start a connection right away. In OTG mode
* we have to wait until we loaded a gadget. We don't really need a
* gadget if we operate as a host but we should not start a session
* as a device without a gadget or else we explode.
*/
#ifdef CONFIG_USB_MUSB_HOST
return 1;
#else
return musb->port_mode == MUSB_PORT_MODE_HOST;
#endif
}
int musb_hub_control(
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength)
{
struct musb *musb = hcd_to_musb(hcd);
u32 temp;
int retval = 0;
unsigned long flags;
bool start_musb = false;
spin_lock_irqsave(&musb->lock, flags);
if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
spin_unlock_irqrestore(&musb->lock, flags);
return -ESHUTDOWN;
}
/* hub features: always zero, setting is a NOP
* port features: reported, sometimes updated when host is active
* no indicators
*/
switch (typeReq) {
case ClearHubFeature:
case SetHubFeature:
switch (wValue) {
case C_HUB_OVER_CURRENT:
case C_HUB_LOCAL_POWER:
break;
default:
goto error;
}
break;
case ClearPortFeature:
if ((wIndex & 0xff) != 1)
goto error;
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
break;
case USB_PORT_FEAT_SUSPEND:
musb_port_suspend(musb, false);
break;
case USB_PORT_FEAT_POWER:
if (!hcd->self.is_b_host)
musb_platform_set_vbus(musb, 0);
break;
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_ENABLE:
case USB_PORT_FEAT_C_OVER_CURRENT:
case USB_PORT_FEAT_C_RESET:
case USB_PORT_FEAT_C_SUSPEND:
break;
default:
goto error;
}
musb_dbg(musb, "clear feature %d", wValue);
musb->port1_status &= ~(1 << wValue);
break;
case GetHubDescriptor:
{
struct usb_hub_descriptor *desc = (void *)buf;
desc->bDescLength = 9;
desc->bDescriptorType = USB_DT_HUB;
desc->bNbrPorts = 1;
desc->wHubCharacteristics = cpu_to_le16(
HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
| HUB_CHAR_NO_OCPM /* no overcurrent reporting */
);
desc->bPwrOn2PwrGood = 5; /* msec/2 */
desc->bHubContrCurrent = 0;
/* workaround bogus struct definition */
desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
desc->u.hs.DeviceRemovable[1] = 0xff;
}
break;
case GetHubStatus:
temp = 0;
*(__le32 *) buf = cpu_to_le32(temp);
break;
case GetPortStatus:
if (wIndex != 1)
goto error;
put_unaligned(cpu_to_le32(musb->port1_status
& ~MUSB_PORT_STAT_RESUME),
(__le32 *) buf);
/* port change status is more interesting */
musb_dbg(musb, "port status %08x", musb->port1_status);
break;
case SetPortFeature:
if ((wIndex & 0xff) != 1)
goto error;
switch (wValue) {
case USB_PORT_FEAT_POWER:
/* NOTE: this controller has a strange state machine
* that involves "requesting sessions" according to
* magic side effects from incompletely-described
* rules about startup...
*
* This call is what really starts the host mode; be
* very careful about side effects if you reorder any
* initialization logic, e.g. for OTG, or change any
* logic relating to VBUS power-up.
*/
if (!hcd->self.is_b_host && musb_has_gadget(musb))
start_musb = true;
break;
case USB_PORT_FEAT_RESET:
musb_port_reset(musb, true);
break;
case USB_PORT_FEAT_SUSPEND:
musb_port_suspend(musb, true);
break;
case USB_PORT_FEAT_TEST:
if (unlikely(is_host_active(musb)))
goto error;
wIndex >>= 8;
switch (wIndex) {
case 1:
pr_debug("TEST_J\n");
temp = MUSB_TEST_J;
break;
case 2:
pr_debug("TEST_K\n");
temp = MUSB_TEST_K;
break;
case 3:
pr_debug("TEST_SE0_NAK\n");
temp = MUSB_TEST_SE0_NAK;
break;
case 4:
pr_debug("TEST_PACKET\n");
temp = MUSB_TEST_PACKET;
musb_load_testpacket(musb);
break;
case 5:
pr_debug("TEST_FORCE_ENABLE\n");
temp = MUSB_TEST_FORCE_HOST
| MUSB_TEST_FORCE_HS;
musb_writeb(musb->mregs, MUSB_DEVCTL,
MUSB_DEVCTL_SESSION);
break;
case 6:
pr_debug("TEST_FIFO_ACCESS\n");
temp = MUSB_TEST_FIFO_ACCESS;
break;
default:
goto error;
}
musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
break;
default:
goto error;
}
musb_dbg(musb, "set feature %d", wValue);
musb->port1_status |= 1 << wValue;
break;
default:
error:
/* "protocol stall" on error */
retval = -EPIPE;
}
spin_unlock_irqrestore(&musb->lock, flags);
if (start_musb)
musb_start(musb);
return retval;
}