From ff927addd62d33ab95cd83208e7db3ff37fdac18 Mon Sep 17 00:00:00 2001 From: Cliff Cai Date: Thu, 25 Mar 2010 13:25:19 +0200 Subject: [PATCH] USB: musb: support host/gadget role switching on Blackfin parts Signed-off-by: Cliff Cai Signed-off-by: Mike Frysinger Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/blackfin.c | 69 +++++++++++++++++++++++++++++++++---- 1 file changed, 63 insertions(+), 6 deletions(-) diff --git a/drivers/usb/musb/blackfin.c b/drivers/usb/musb/blackfin.c index eb4392f904e..8052e7659ac 100644 --- a/drivers/usb/musb/blackfin.c +++ b/drivers/usb/musb/blackfin.c @@ -170,6 +170,13 @@ static irqreturn_t blackfin_interrupt(int irq, void *__hci) retval = musb_interrupt(musb); } + /* Start sampling ID pin, when plug is removed from MUSB */ + if (is_otg_enabled(musb) && (musb->xceiv->state == OTG_STATE_B_IDLE + || musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) { + mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); + musb->a_wait_bcon = TIMER_DELAY; + } + spin_unlock_irqrestore(&musb->lock, flags); return retval; @@ -180,6 +187,7 @@ static void musb_conn_timer_handler(unsigned long _musb) struct musb *musb = (void *)_musb; unsigned long flags; u16 val; + static u8 toggle; spin_lock_irqsave(&musb->lock, flags); switch (musb->xceiv->state) { @@ -187,10 +195,44 @@ static void musb_conn_timer_handler(unsigned long _musb) case OTG_STATE_A_WAIT_BCON: /* Start a new session */ val = musb_readw(musb->mregs, MUSB_DEVCTL); + val &= ~MUSB_DEVCTL_SESSION; + musb_writew(musb->mregs, MUSB_DEVCTL, val); val |= MUSB_DEVCTL_SESSION; musb_writew(musb->mregs, MUSB_DEVCTL, val); + /* Check if musb is host or peripheral. */ + val = musb_readw(musb->mregs, MUSB_DEVCTL); + + if (!(val & MUSB_DEVCTL_BDEVICE)) { + gpio_set_value(musb->config->gpio_vrsel, 1); + musb->xceiv->state = OTG_STATE_A_WAIT_BCON; + } else { + gpio_set_value(musb->config->gpio_vrsel, 0); + /* Ignore VBUSERROR and SUSPEND IRQ */ + val = musb_readb(musb->mregs, MUSB_INTRUSBE); + val &= ~MUSB_INTR_VBUSERROR; + musb_writeb(musb->mregs, MUSB_INTRUSBE, val); + val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR; + musb_writeb(musb->mregs, MUSB_INTRUSB, val); + if (is_otg_enabled(musb)) + musb->xceiv->state = OTG_STATE_B_IDLE; + else + musb_writeb(musb->mregs, MUSB_POWER, MUSB_POWER_HSENAB); + } + mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); + break; + case OTG_STATE_B_IDLE: + + if (!is_peripheral_enabled(musb)) + break; + /* Start a new session. It seems that MUSB needs taking + * some time to recognize the type of the plug inserted? + */ val = musb_readw(musb->mregs, MUSB_DEVCTL); + val |= MUSB_DEVCTL_SESSION; + musb_writew(musb->mregs, MUSB_DEVCTL, val); + val = musb_readw(musb->mregs, MUSB_DEVCTL); + if (!(val & MUSB_DEVCTL_BDEVICE)) { gpio_set_value(musb->config->gpio_vrsel, 1); musb->xceiv->state = OTG_STATE_A_WAIT_BCON; @@ -205,12 +247,27 @@ static void musb_conn_timer_handler(unsigned long _musb) val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR; musb_writeb(musb->mregs, MUSB_INTRUSB, val); - val = MUSB_POWER_HSENAB; - musb_writeb(musb->mregs, MUSB_POWER, val); + /* Toggle the Soft Conn bit, so that we can response to + * the inserting of either A-plug or B-plug. + */ + if (toggle) { + val = musb_readb(musb->mregs, MUSB_POWER); + val &= ~MUSB_POWER_SOFTCONN; + musb_writeb(musb->mregs, MUSB_POWER, val); + toggle = 0; + } else { + val = musb_readb(musb->mregs, MUSB_POWER); + val |= MUSB_POWER_SOFTCONN; + musb_writeb(musb->mregs, MUSB_POWER, val); + toggle = 1; + } + /* The delay time is set to 1/4 second by default, + * shortening it, if accelerating A-plug detection + * is needed in OTG mode. + */ + mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY / 4); } - mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); break; - default: DBG(1, "%s state not handled\n", otg_state_string(musb)); break; @@ -222,7 +279,7 @@ static void musb_conn_timer_handler(unsigned long _musb) void musb_platform_enable(struct musb *musb) { - if (is_host_enabled(musb)) { + if (!is_otg_enabled(musb) && is_host_enabled(musb)) { mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); musb->a_wait_bcon = TIMER_DELAY; } @@ -256,7 +313,7 @@ static int bfin_set_power(struct otg_transceiver *x, unsigned mA) void musb_platform_try_idle(struct musb *musb, unsigned long timeout) { - if (is_host_enabled(musb)) + if (!is_otg_enabled(musb) && is_host_enabled(musb)) mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); } -- 2.41.0