diff options
Diffstat (limited to 'drivers/usb/musb/mpfs.c')
| -rw-r--r-- | drivers/usb/musb/mpfs.c | 160 |
1 files changed, 136 insertions, 24 deletions
diff --git a/drivers/usb/musb/mpfs.c b/drivers/usb/musb/mpfs.c index 29c7e5cdb230..00e13214aa76 100644 --- a/drivers/usb/musb/mpfs.c +++ b/drivers/usb/musb/mpfs.c @@ -49,30 +49,6 @@ static const struct musb_hdrc_config mpfs_musb_hdrc_config = { .ram_bits = MPFS_MUSB_RAM_BITS, }; -static irqreturn_t mpfs_musb_interrupt(int irq, void *__hci) -{ - unsigned long flags; - irqreturn_t ret = IRQ_NONE; - struct musb *musb = __hci; - - spin_lock_irqsave(&musb->lock, flags); - - musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); - musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); - musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); - - if (musb->int_usb || musb->int_tx || musb->int_rx) { - musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb); - musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx); - musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx); - ret = musb_interrupt(musb); - } - - spin_unlock_irqrestore(&musb->lock, flags); - - return ret; -} - static void mpfs_musb_set_vbus(struct musb *musb, int is_on) { u8 devctl; @@ -111,6 +87,129 @@ static void mpfs_musb_set_vbus(struct musb *musb, int is_on) musb_readb(musb->mregs, MUSB_DEVCTL)); } +#define POLL_SECONDS 2 + +static void otg_timer(struct timer_list *t) +{ + struct musb *musb = from_timer(musb, t, dev_timer); + void __iomem *mregs = musb->mregs; + u8 devctl; + unsigned long flags; + + /* + * We poll because PolarFire SoC won't expose several OTG-critical + * status change events (from the transceiver) otherwise. + */ + devctl = musb_readb(mregs, MUSB_DEVCTL); + dev_dbg(musb->controller, "Poll devctl %02x (%s)\n", devctl, + usb_otg_state_string(musb->xceiv->otg->state)); + + spin_lock_irqsave(&musb->lock, flags); + switch (musb->xceiv->otg->state) { + case OTG_STATE_A_WAIT_BCON: + devctl &= ~MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + if (devctl & MUSB_DEVCTL_BDEVICE) { + musb->xceiv->otg->state = OTG_STATE_B_IDLE; + MUSB_DEV_MODE(musb); + mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); + } else { + musb->xceiv->otg->state = OTG_STATE_A_IDLE; + MUSB_HST_MODE(musb); + } + break; + case OTG_STATE_A_WAIT_VFALL: + if (devctl & MUSB_DEVCTL_VBUS) { + mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); + break; + } + musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; + break; + case OTG_STATE_B_IDLE: + /* + * There's no ID-changed IRQ, so we have no good way to tell + * when to switch to the A-Default state machine (by setting + * the DEVCTL.Session bit). + * + * Workaround: whenever we're in B_IDLE, try setting the + * session flag every few seconds. If it works, ID was + * grounded and we're now in the A-Default state machine. + * + * NOTE: setting the session flag is _supposed_ to trigger + * SRP but clearly it doesn't. + */ + musb_writeb(mregs, MUSB_DEVCTL, devctl | MUSB_DEVCTL_SESSION); + devctl = musb_readb(mregs, MUSB_DEVCTL); + if (devctl & MUSB_DEVCTL_BDEVICE) + mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); + else + musb->xceiv->otg->state = OTG_STATE_A_IDLE; + break; + default: + break; + } + spin_unlock_irqrestore(&musb->lock, flags); +} + +static void __maybe_unused mpfs_musb_try_idle(struct musb *musb, unsigned long timeout) +{ + static unsigned long last_timer; + + if (timeout == 0) + timeout = jiffies + msecs_to_jiffies(3); + + /* Never idle if active, or when VBUS timeout is not set as host */ + if (musb->is_active || (musb->a_wait_bcon == 0 && + musb->xceiv->otg->state == OTG_STATE_A_WAIT_BCON)) { + dev_dbg(musb->controller, "%s active, deleting timer\n", + usb_otg_state_string(musb->xceiv->otg->state)); + del_timer(&musb->dev_timer); + last_timer = jiffies; + return; + } + + if (time_after(last_timer, timeout) && timer_pending(&musb->dev_timer)) { + dev_dbg(musb->controller, "Longer idle timer already pending, ignoring...\n"); + return; + } + last_timer = timeout; + + dev_dbg(musb->controller, "%s inactive, starting idle timer for %u ms\n", + usb_otg_state_string(musb->xceiv->otg->state), + jiffies_to_msecs(timeout - jiffies)); + mod_timer(&musb->dev_timer, timeout); +} + +static irqreturn_t mpfs_musb_interrupt(int irq, void *__hci) +{ + unsigned long flags; + irqreturn_t ret = IRQ_NONE; + struct musb *musb = __hci; + + spin_lock_irqsave(&musb->lock, flags); + + musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); + musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); + musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); + + if (musb->int_usb || musb->int_tx || musb->int_rx) { + musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb); + musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx); + musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx); + ret = musb_interrupt(musb); + } + + /* Poll for ID change */ + if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) + mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ); + + spin_unlock_irqrestore(&musb->lock, flags); + + return ret; +} + static int mpfs_musb_init(struct musb *musb) { struct device *dev = musb->controller; @@ -121,6 +220,8 @@ static int mpfs_musb_init(struct musb *musb) return PTR_ERR(musb->xceiv); } + timer_setup(&musb->dev_timer, otg_timer, 0); + musb->dyn_fifo = true; musb->isr = mpfs_musb_interrupt; @@ -129,14 +230,25 @@ static int mpfs_musb_init(struct musb *musb) return 0; } +static int mpfs_musb_exit(struct musb *musb) +{ + del_timer_sync(&musb->dev_timer); + + return 0; +} + static const struct musb_platform_ops mpfs_ops = { .quirks = MUSB_DMA_INVENTRA, .init = mpfs_musb_init, + .exit = mpfs_musb_exit, .fifo_mode = 2, #ifdef CONFIG_USB_INVENTRA_DMA .dma_init = musbhs_dma_controller_create, .dma_exit = musbhs_dma_controller_destroy, #endif +#ifndef CONFIG_USB_MUSB_HOST + .try_idle = mpfs_musb_try_idle, +#endif .set_vbus = mpfs_musb_set_vbus }; |