441 lines
11 KiB
C
441 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* MUSB OTG driver virtual root hub support
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*
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* Copyright 2005 Mentor Graphics Corporation
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* Copyright (C) 2005-2006 by Texas Instruments
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* Copyright (C) 2006-2007 Nokia Corporation
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <asm/unaligned.h>
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#include "musb_core.h"
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void musb_host_finish_resume(struct work_struct *work)
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{
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struct musb *musb;
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unsigned long flags;
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u8 power;
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musb = container_of(work, struct musb, finish_resume_work.work);
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spin_lock_irqsave(&musb->lock, flags);
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power = musb_readb(musb->mregs, MUSB_POWER);
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power &= ~MUSB_POWER_RESUME;
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musb_dbg(musb, "root port resume stopped, power %02x", power);
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musb_writeb(musb->mregs, MUSB_POWER, power);
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/*
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* ISSUE: DaVinci (RTL 1.300) disconnects after
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* resume of high speed peripherals (but not full
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* speed ones).
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*/
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musb->is_active = 1;
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musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
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musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
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usb_hcd_poll_rh_status(musb->hcd);
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/* NOTE: it might really be A_WAIT_BCON ... */
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musb->xceiv->otg->state = OTG_STATE_A_HOST;
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spin_unlock_irqrestore(&musb->lock, flags);
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}
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int musb_port_suspend(struct musb *musb, bool do_suspend)
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{
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struct usb_otg *otg = musb->xceiv->otg;
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u8 power;
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void __iomem *mbase = musb->mregs;
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if (!is_host_active(musb))
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return 0;
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/* NOTE: this doesn't necessarily put PHY into low power mode,
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* turning off its clock; that's a function of PHY integration and
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* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
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* SE0 changing to connect (J) or wakeup (K) states.
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*/
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power = musb_readb(mbase, MUSB_POWER);
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if (do_suspend) {
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int retries = 10000;
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if (power & MUSB_POWER_RESUME)
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return -EBUSY;
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if (!(power & MUSB_POWER_SUSPENDM)) {
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power |= MUSB_POWER_SUSPENDM;
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musb_writeb(mbase, MUSB_POWER, power);
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/* Needed for OPT A tests */
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power = musb_readb(mbase, MUSB_POWER);
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while (power & MUSB_POWER_SUSPENDM) {
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power = musb_readb(mbase, MUSB_POWER);
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if (retries-- < 1)
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break;
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}
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}
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musb_dbg(musb, "Root port suspended, power %02x", power);
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musb->port1_status |= USB_PORT_STAT_SUSPEND;
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switch (musb->xceiv->otg->state) {
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case OTG_STATE_A_HOST:
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musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
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musb->is_active = otg->host->b_hnp_enable;
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if (musb->is_active)
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mod_timer(&musb->otg_timer, jiffies
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+ msecs_to_jiffies(
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OTG_TIME_A_AIDL_BDIS));
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musb_platform_try_idle(musb, 0);
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break;
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case OTG_STATE_B_HOST:
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musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
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musb->is_active = otg->host->b_hnp_enable;
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musb_platform_try_idle(musb, 0);
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break;
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default:
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musb_dbg(musb, "bogus rh suspend? %s",
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usb_otg_state_string(musb->xceiv->otg->state));
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}
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} else if (power & MUSB_POWER_SUSPENDM) {
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power &= ~MUSB_POWER_SUSPENDM;
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power |= MUSB_POWER_RESUME;
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musb_writeb(mbase, MUSB_POWER, power);
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musb_dbg(musb, "Root port resuming, power %02x", power);
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musb->port1_status |= MUSB_PORT_STAT_RESUME;
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schedule_delayed_work(&musb->finish_resume_work,
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msecs_to_jiffies(USB_RESUME_TIMEOUT));
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}
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return 0;
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}
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void musb_port_reset(struct musb *musb, bool do_reset)
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{
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u8 power;
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void __iomem *mbase = musb->mregs;
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if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
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musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
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musb->port1_status &= ~USB_PORT_STAT_RESET;
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return;
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}
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if (!is_host_active(musb))
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return;
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/* NOTE: caller guarantees it will turn off the reset when
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* the appropriate amount of time has passed
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*/
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power = musb_readb(mbase, MUSB_POWER);
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if (do_reset) {
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/*
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* If RESUME is set, we must make sure it stays minimum 20 ms.
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* Then we must clear RESUME and wait a bit to let musb start
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* generating SOFs. If we don't do this, OPT HS A 6.8 tests
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* fail with "Error! Did not receive an SOF before suspend
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* detected".
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*/
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if (power & MUSB_POWER_RESUME) {
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long remain = (unsigned long) musb->rh_timer - jiffies;
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if (musb->rh_timer > 0 && remain > 0) {
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/* take into account the minimum delay after resume */
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schedule_delayed_work(
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&musb->deassert_reset_work, remain);
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return;
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}
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musb_writeb(mbase, MUSB_POWER,
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power & ~MUSB_POWER_RESUME);
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/* Give the core 1 ms to clear MUSB_POWER_RESUME */
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schedule_delayed_work(&musb->deassert_reset_work,
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msecs_to_jiffies(1));
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return;
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}
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power &= 0xf0;
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musb_writeb(mbase, MUSB_POWER,
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power | MUSB_POWER_RESET);
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musb->port1_status |= USB_PORT_STAT_RESET;
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musb->port1_status &= ~USB_PORT_STAT_ENABLE;
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schedule_delayed_work(&musb->deassert_reset_work,
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msecs_to_jiffies(50));
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} else {
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musb_dbg(musb, "root port reset stopped");
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musb_platform_pre_root_reset_end(musb);
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musb_writeb(mbase, MUSB_POWER,
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power & ~MUSB_POWER_RESET);
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musb_platform_post_root_reset_end(musb);
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power = musb_readb(mbase, MUSB_POWER);
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if (power & MUSB_POWER_HSMODE) {
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musb_dbg(musb, "high-speed device connected");
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musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
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}
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musb->port1_status &= ~USB_PORT_STAT_RESET;
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musb->port1_status |= USB_PORT_STAT_ENABLE
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| (USB_PORT_STAT_C_RESET << 16)
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| (USB_PORT_STAT_C_ENABLE << 16);
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usb_hcd_poll_rh_status(musb->hcd);
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musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
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}
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}
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void musb_root_disconnect(struct musb *musb)
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{
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struct usb_otg *otg = musb->xceiv->otg;
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musb->port1_status = USB_PORT_STAT_POWER
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| (USB_PORT_STAT_C_CONNECTION << 16);
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usb_hcd_poll_rh_status(musb->hcd);
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musb->is_active = 0;
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switch (musb->xceiv->otg->state) {
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case OTG_STATE_A_SUSPEND:
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if (otg->host->b_hnp_enable) {
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musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
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musb->g.is_a_peripheral = 1;
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break;
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}
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fallthrough;
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case OTG_STATE_A_HOST:
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musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
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musb->is_active = 0;
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break;
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case OTG_STATE_A_WAIT_VFALL:
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musb->xceiv->otg->state = OTG_STATE_B_IDLE;
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break;
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default:
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musb_dbg(musb, "host disconnect (%s)",
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usb_otg_state_string(musb->xceiv->otg->state));
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}
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}
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EXPORT_SYMBOL_GPL(musb_root_disconnect);
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/*---------------------------------------------------------------------*/
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/* Caller may or may not hold musb->lock */
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int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
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{
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struct musb *musb = hcd_to_musb(hcd);
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int retval = 0;
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/* called in_irq() via usb_hcd_poll_rh_status() */
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if (musb->port1_status & 0xffff0000) {
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*buf = 0x02;
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retval = 1;
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}
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return retval;
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}
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static int musb_has_gadget(struct musb *musb)
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{
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/*
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* In host-only mode we start a connection right away. In OTG mode
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* we have to wait until we loaded a gadget. We don't really need a
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* gadget if we operate as a host but we should not start a session
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* as a device without a gadget or else we explode.
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*/
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#ifdef CONFIG_USB_MUSB_HOST
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return 1;
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#else
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return musb->port_mode == MUSB_HOST;
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#endif
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}
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int musb_hub_control(
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struct usb_hcd *hcd,
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u16 typeReq,
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u16 wValue,
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u16 wIndex,
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char *buf,
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u16 wLength)
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{
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struct musb *musb = hcd_to_musb(hcd);
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u32 temp;
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int retval = 0;
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unsigned long flags;
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bool start_musb = false;
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spin_lock_irqsave(&musb->lock, flags);
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if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
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spin_unlock_irqrestore(&musb->lock, flags);
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return -ESHUTDOWN;
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}
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/* hub features: always zero, setting is a NOP
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* port features: reported, sometimes updated when host is active
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* no indicators
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*/
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switch (typeReq) {
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case ClearHubFeature:
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case SetHubFeature:
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switch (wValue) {
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case C_HUB_OVER_CURRENT:
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case C_HUB_LOCAL_POWER:
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break;
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default:
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goto error;
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}
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break;
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case ClearPortFeature:
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if ((wIndex & 0xff) != 1)
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goto error;
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switch (wValue) {
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case USB_PORT_FEAT_ENABLE:
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break;
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case USB_PORT_FEAT_SUSPEND:
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musb_port_suspend(musb, false);
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break;
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case USB_PORT_FEAT_POWER:
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if (!hcd->self.is_b_host)
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musb_platform_set_vbus(musb, 0);
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break;
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case USB_PORT_FEAT_C_CONNECTION:
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case USB_PORT_FEAT_C_ENABLE:
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case USB_PORT_FEAT_C_OVER_CURRENT:
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case USB_PORT_FEAT_C_RESET:
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case USB_PORT_FEAT_C_SUSPEND:
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break;
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default:
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goto error;
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}
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musb_dbg(musb, "clear feature %d", wValue);
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musb->port1_status &= ~(1 << wValue);
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break;
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case GetHubDescriptor:
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{
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struct usb_hub_descriptor *desc = (void *)buf;
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desc->bDescLength = 9;
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desc->bDescriptorType = USB_DT_HUB;
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desc->bNbrPorts = 1;
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desc->wHubCharacteristics = cpu_to_le16(
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HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
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| HUB_CHAR_NO_OCPM /* no overcurrent reporting */
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);
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desc->bPwrOn2PwrGood = 5; /* msec/2 */
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desc->bHubContrCurrent = 0;
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/* workaround bogus struct definition */
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desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
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desc->u.hs.DeviceRemovable[1] = 0xff;
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}
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break;
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case GetHubStatus:
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temp = 0;
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*(__le32 *) buf = cpu_to_le32(temp);
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break;
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case GetPortStatus:
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if (wIndex != 1)
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goto error;
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put_unaligned(cpu_to_le32(musb->port1_status
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& ~MUSB_PORT_STAT_RESUME),
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(__le32 *) buf);
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/* port change status is more interesting */
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musb_dbg(musb, "port status %08x", musb->port1_status);
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break;
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case SetPortFeature:
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if ((wIndex & 0xff) != 1)
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goto error;
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switch (wValue) {
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case USB_PORT_FEAT_POWER:
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/* NOTE: this controller has a strange state machine
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* that involves "requesting sessions" according to
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* magic side effects from incompletely-described
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* rules about startup...
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*
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* This call is what really starts the host mode; be
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* very careful about side effects if you reorder any
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* initialization logic, e.g. for OTG, or change any
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* logic relating to VBUS power-up.
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*/
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if (!hcd->self.is_b_host && musb_has_gadget(musb))
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start_musb = true;
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break;
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case USB_PORT_FEAT_RESET:
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musb_port_reset(musb, true);
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break;
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case USB_PORT_FEAT_SUSPEND:
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musb_port_suspend(musb, true);
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break;
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case USB_PORT_FEAT_TEST:
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if (unlikely(is_host_active(musb)))
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goto error;
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wIndex >>= 8;
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switch (wIndex) {
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case USB_TEST_J:
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pr_debug("USB_TEST_J\n");
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temp = MUSB_TEST_J;
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break;
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case USB_TEST_K:
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pr_debug("USB_TEST_K\n");
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temp = MUSB_TEST_K;
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break;
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case USB_TEST_SE0_NAK:
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pr_debug("USB_TEST_SE0_NAK\n");
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temp = MUSB_TEST_SE0_NAK;
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break;
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case USB_TEST_PACKET:
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pr_debug("USB_TEST_PACKET\n");
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temp = MUSB_TEST_PACKET;
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musb_load_testpacket(musb);
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break;
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case USB_TEST_FORCE_ENABLE:
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pr_debug("USB_TEST_FORCE_ENABLE\n");
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temp = MUSB_TEST_FORCE_HOST
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| MUSB_TEST_FORCE_HS;
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musb_writeb(musb->mregs, MUSB_DEVCTL,
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MUSB_DEVCTL_SESSION);
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break;
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case 6:
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pr_debug("TEST_FIFO_ACCESS\n");
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temp = MUSB_TEST_FIFO_ACCESS;
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break;
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default:
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goto error;
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}
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musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
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break;
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default:
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goto error;
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}
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musb_dbg(musb, "set feature %d", wValue);
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musb->port1_status |= 1 << wValue;
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break;
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default:
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error:
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/* "protocol stall" on error */
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retval = -EPIPE;
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}
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spin_unlock_irqrestore(&musb->lock, flags);
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if (start_musb)
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musb_start(musb);
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return retval;
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}
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