static int msm_otg_set_peripheral(struct otg_transceiver *xceiv,
struct usb_gadget *gadget)
{
struct msm_otg *dev = container_of(xceiv, struct msm_otg, otg);
if (!dev || (dev != the_msm_otg))
return -ENODEV;
if (!gadget) {
msm_otg_start_peripheral(xceiv, 0);
dev->otg.gadget = 0;
disable_sess_valid(dev);
return 0;
}
dev->otg.gadget = gadget;
enable_sess_valid(dev);
pr_info("peripheral driver registered w/ tranceiver\n");
if (is_b_sess_vld())
msm_otg_start_peripheral(&dev->otg, 1);
else if (is_host())
msm_otg_start_host(&dev->otg, 1);
else
msm_otg_suspend(dev);
return 0;
}
static irqreturn_t msm_otg_irq(int irq, void *data)
{
struct msm_otg *dev = data;
u32 otgsc = 0;
if (dev->in_lpm) {
msm_otg_resume(dev);
return IRQ_HANDLED;
}
otgsc = readl(USB_OTGSC);
if (!otgsc & OTGSC_INTR_STS_MASK)
return IRQ_HANDLED;
if ((otgsc & OTGSC_IDIS) && (otgsc & OTGSC_IDIE)) {
pr_info("ID -> (%s)\n", (otgsc & OTGSC_ID) ? "B" : "A");
msm_otg_start_host(&dev->otg, is_host());
} else if ((otgsc & OTGSC_BSVIS) && (otgsc & OTGSC_BSVIE)) {
pr_info("VBUS - (%s)\n", otgsc & OTGSC_BSV ? "ON" : "OFF");
if (!is_host())
msm_otg_start_peripheral(&dev->otg, is_b_sess_vld());
}
writel(otgsc, USB_OTGSC);
return IRQ_HANDLED;
}
static void msm_otg_sm_work(struct work_struct *w)
{
struct msm_otg *dev = container_of(w, struct msm_otg, sm_work);
int ret;
int work = 0;
enum usb_otg_state state;
if (atomic_read(&dev->in_lpm))
msm_otg_set_suspend(&dev->otg, 0);
spin_lock_irq(&dev->lock);
state = dev->otg.state;
spin_unlock_irq(&dev->lock);
pr_debug("state: %s\n", state_string(state));
switch (state) {
case OTG_STATE_UNDEFINED:
if (!dev->otg.host || !is_host())
set_bit(ID, &dev->inputs);
if (dev->otg.gadget && is_b_sess_vld())
set_bit(B_SESS_VLD, &dev->inputs);
spin_lock_irq(&dev->lock);
if (test_bit(ID, &dev->inputs)) {
dev->otg.state = OTG_STATE_B_IDLE;
} else {
set_bit(A_BUS_REQ, &dev->inputs);
dev->otg.state = OTG_STATE_A_IDLE;
}
spin_unlock_irq(&dev->lock);
work = 1;
break;
case OTG_STATE_B_IDLE:
dev->otg.default_a = 0;
if (!test_bit(ID, &dev->inputs)) {
pr_debug("!id\n");
clear_bit(B_BUS_REQ, &dev->inputs);
otg_reset(dev, 0);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_IDLE;
spin_unlock_irq(&dev->lock);
work = 1;
} else if (test_bit(B_SESS_VLD, &dev->inputs)) {
pr_debug("b_sess_vld\n");
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_PERIPHERAL;
spin_unlock_irq(&dev->lock);
msm_otg_start_peripheral(&dev->otg, 1);
} else if (test_bit(B_BUS_REQ, &dev->inputs)) {
pr_debug("b_sess_end && b_bus_req\n");
ret = msm_otg_start_srp(&dev->otg);
if (ret < 0) {
/* notify user space */
clear_bit(B_BUS_REQ, &dev->inputs);
work = 1;
break;
}
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_SRP_INIT;
spin_unlock_irq(&dev->lock);
msm_otg_start_timer(dev, TB_SRP_FAIL, B_SRP_FAIL);
break;
} else {
pr_debug("entering into lpm\n");
msm_otg_suspend(dev);
}
break;
case OTG_STATE_B_SRP_INIT:
if (!test_bit(ID, &dev->inputs) ||
test_bit(B_SESS_VLD, &dev->inputs)) {
pr_debug("!id || b_sess_vld\n");
msm_otg_del_timer(dev);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_IDLE;
spin_unlock_irq(&dev->lock);
work = 1;
} else if (test_bit(B_SRP_FAIL, &dev->tmouts)) {
pr_debug("b_srp_fail\n");
/* notify user space */
clear_bit(B_BUS_REQ, &dev->inputs);
clear_bit(B_SRP_FAIL, &dev->tmouts);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_IDLE;
spin_unlock_irq(&dev->lock);
dev->b_last_se0_sess = jiffies;
work = 1;
}
break;
case OTG_STATE_B_PERIPHERAL:
if (!test_bit(ID, &dev->inputs) ||
!test_bit(B_SESS_VLD, &dev->inputs)) {
pr_debug("!id || !b_sess_vld\n");
clear_bit(B_BUS_REQ, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_IDLE;
spin_unlock_irq(&dev->lock);
msm_otg_start_peripheral(&dev->otg, 0);
dev->b_last_se0_sess = jiffies;
/* Workaround: Reset phy after session */
otg_reset(dev, 1);
/* come back later to put hardware in
* lpm. This removes addition checks in
* suspend routine for missing BSV
*/
work = 1;
} else if (test_bit(B_BUS_REQ, &dev->inputs) &&
dev->otg.gadget->b_hnp_enable &&
test_bit(A_BUS_SUSPEND, &dev->inputs)) {
pr_debug("b_bus_req && b_hnp_en && a_bus_suspend\n");
msm_otg_start_timer(dev, TB_ASE0_BRST, B_ASE0_BRST);
msm_otg_start_peripheral(&dev->otg, 0);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_WAIT_ACON;
spin_unlock_irq(&dev->lock);
/* start HCD even before A-device enable
* pull-up to meet HNP timings.
*/
dev->otg.host->is_b_host = 1;
msm_otg_start_host(&dev->otg, REQUEST_START);
}
break;
case OTG_STATE_B_WAIT_ACON:
if (!test_bit(ID, &dev->inputs) ||
!test_bit(B_SESS_VLD, &dev->inputs)) {
pr_debug("!id || !b_sess_vld\n");
msm_otg_del_timer(dev);
/* A-device is physically disconnected during
* HNP. Remove HCD.
*/
msm_otg_start_host(&dev->otg, REQUEST_STOP);
dev->otg.host->is_b_host = 0;
clear_bit(B_BUS_REQ, &dev->inputs);
clear_bit(A_BUS_SUSPEND, &dev->inputs);
dev->b_last_se0_sess = jiffies;
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_IDLE;
spin_unlock_irq(&dev->lock);
/* Workaround: Reset phy after session */
otg_reset(dev, 1);
work = 1;
} else if (test_bit(A_CONN, &dev->inputs)) {
pr_debug("a_conn\n");
clear_bit(A_BUS_SUSPEND, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_HOST;
spin_unlock_irq(&dev->lock);
} else if (test_bit(B_ASE0_BRST, &dev->tmouts)) {
/* TODO: A-device may send reset after
* enabling HNP; a_bus_resume case is
* not handled for now.
*/
pr_debug("b_ase0_brst_tmout\n");
msm_otg_start_host(&dev->otg, REQUEST_STOP);
dev->otg.host->is_b_host = 0;
clear_bit(B_ASE0_BRST, &dev->tmouts);
clear_bit(A_BUS_SUSPEND, &dev->inputs);
clear_bit(B_BUS_REQ, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_PERIPHERAL;
spin_unlock_irq(&dev->lock);
msm_otg_start_host(&dev->otg, REQUEST_STOP);
}
break;
case OTG_STATE_B_HOST:
/* B_BUS_REQ is not exposed to user space. So
* it must be A_CONN for now.
*/
if (!test_bit(B_BUS_REQ, &dev->inputs) ||
!test_bit(A_CONN, &dev->inputs)) {
pr_debug("!b_bus_req || !a_conn\n");
clear_bit(A_CONN, &dev->inputs);
clear_bit(B_BUS_REQ, &dev->inputs);
msm_otg_start_host(&dev->otg, 0);
dev->otg.host->is_b_host = 0;
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_IDLE;
spin_unlock_irq(&dev->lock);
/* Workaround: Reset phy after session */
otg_reset(dev, 1);
work = 1;
}
break;
case OTG_STATE_A_IDLE:
dev->otg.default_a = 1;
if (test_bit(ID, &dev->inputs)) {
pr_debug("id\n");
dev->otg.default_a = 0;
otg_reset(dev, 0);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_B_IDLE;
spin_unlock_irq(&dev->lock);
work = 1;
} else if (!test_bit(A_BUS_DROP, &dev->inputs) &&
(test_bit(A_SRP_DET, &dev->inputs) ||
test_bit(A_BUS_REQ, &dev->inputs))) {
pr_debug("!a_bus_drop && (a_srp_det || a_bus_req)\n");
clear_bit(A_SRP_DET, &dev->inputs);
/* Disable SRP detection */
writel((readl(USB_OTGSC) & ~OTGSC_INTR_STS_MASK) &
~OTGSC_DPIE, USB_OTGSC);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_VRISE;
spin_unlock_irq(&dev->lock);
dev->pdata->vbus_power(USB_PHY_INTEGRATED, 1);
msm_otg_start_timer(dev, TA_WAIT_VRISE, A_WAIT_VRISE);
/* no need to schedule work now */
} else {
pr_debug("No session requested\n");
/* A-device is not providing power on VBUS.
* Enable SRP detection.
*/
writel((readl(USB_OTGSC) & ~OTGSC_INTR_STS_MASK) |
OTGSC_DPIE, USB_OTGSC);
msm_otg_suspend(dev);
}
break;
case OTG_STATE_A_WAIT_VRISE:
if (test_bit(ID, &dev->inputs) ||
test_bit(A_BUS_DROP, &dev->inputs) ||
test_bit(A_WAIT_VRISE, &dev->tmouts)) {
pr_debug("id || a_bus_drop || a_wait_vrise_tmout\n");
clear_bit(A_BUS_REQ, &dev->inputs);
msm_otg_del_timer(dev);
dev->pdata->vbus_power(USB_PHY_INTEGRATED, 0);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_VFALL;
spin_unlock_irq(&dev->lock);
msm_otg_start_timer(dev, TA_WAIT_VFALL, A_WAIT_VFALL);
} else if (test_bit(A_VBUS_VLD, &dev->inputs)) {
pr_debug("a_vbus_vld\n");
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_BCON;
spin_unlock_irq(&dev->lock);
msm_otg_start_timer(dev, TA_WAIT_BCON, A_WAIT_BCON);
/* Start HCD to detect peripherals. */
msm_otg_start_host(&dev->otg, REQUEST_START);
}
break;
case OTG_STATE_A_WAIT_BCON:
if (test_bit(ID, &dev->inputs) ||
test_bit(A_BUS_DROP, &dev->inputs) ||
test_bit(A_WAIT_BCON, &dev->tmouts)) {
pr_debug("id || a_bus_drop || a_wait_bcon_tmout\n");
msm_otg_del_timer(dev);
clear_bit(A_BUS_REQ, &dev->inputs);
msm_otg_start_host(&dev->otg, REQUEST_STOP);
dev->pdata->vbus_power(USB_PHY_INTEGRATED, 0);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_VFALL;
spin_unlock_irq(&dev->lock);
msm_otg_start_timer(dev, TA_WAIT_VFALL, A_WAIT_VFALL);
} else if (test_bit(B_CONN, &dev->inputs)) {
pr_debug("b_conn\n");
msm_otg_del_timer(dev);
/* HCD is added already. just move to
* A_HOST state.
*/
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_HOST;
spin_unlock_irq(&dev->lock);
} else if (!test_bit(A_VBUS_VLD, &dev->inputs)) {
pr_debug("!a_vbus_vld\n");
msm_otg_del_timer(dev);
msm_otg_start_host(&dev->otg, REQUEST_STOP);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_VBUS_ERR;
spin_unlock_irq(&dev->lock);
}
break;
case OTG_STATE_A_HOST:
if (test_bit(ID, &dev->inputs) ||
test_bit(A_BUS_DROP, &dev->inputs)) {
pr_debug("id || a_bus_drop\n");
clear_bit(B_CONN, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_VFALL;
spin_unlock_irq(&dev->lock);
msm_otg_start_host(&dev->otg, REQUEST_STOP);
dev->pdata->vbus_power(USB_PHY_INTEGRATED, 0);
msm_otg_start_timer(dev, TA_WAIT_VFALL, A_WAIT_VFALL);
} else if (!test_bit(A_VBUS_VLD, &dev->inputs)) {
pr_debug("!a_vbus_vld\n");
clear_bit(B_CONN, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_VBUS_ERR;
spin_unlock_irq(&dev->lock);
msm_otg_start_host(&dev->otg, REQUEST_STOP);
/* no work */
} else if (!test_bit(A_BUS_REQ, &dev->inputs)) {
/* a_bus_req is de-asserted when root hub is
* suspended or HNP is in progress.
*/
pr_debug("!a_bus_req\n");
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_SUSPEND;
spin_unlock_irq(&dev->lock);
if (dev->otg.host->b_hnp_enable) {
msm_otg_start_timer(dev, TA_AIDL_BDIS,
A_AIDL_BDIS);
} else {
/* No HNP. Root hub suspended */
msm_otg_suspend(dev);
}
} else if (!test_bit(B_CONN, &dev->inputs)) {
pr_debug("!b_conn\n");
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_BCON;
spin_unlock_irq(&dev->lock);
msm_otg_start_timer(dev, TA_WAIT_BCON, A_WAIT_BCON);
}
break;
case OTG_STATE_A_SUSPEND:
if (test_bit(ID, &dev->inputs) ||
test_bit(A_BUS_DROP, &dev->inputs) ||
test_bit(A_AIDL_BDIS, &dev->tmouts)) {
pr_debug("id || a_bus_drop || a_aidl_bdis_tmout\n");
msm_otg_del_timer(dev);
clear_bit(B_CONN, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_VFALL;
spin_unlock_irq(&dev->lock);
msm_otg_start_host(&dev->otg, REQUEST_STOP);
dev->pdata->vbus_power(USB_PHY_INTEGRATED, 0);
msm_otg_start_timer(dev, TA_WAIT_VFALL, A_WAIT_VFALL);
} else if (!test_bit(A_VBUS_VLD, &dev->inputs)) {
pr_debug("!a_vbus_vld\n");
msm_otg_del_timer(dev);
clear_bit(B_CONN, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_VBUS_ERR;
spin_unlock_irq(&dev->lock);
msm_otg_start_host(&dev->otg, REQUEST_STOP);
} else if (!test_bit(B_CONN, &dev->inputs) &&
dev->otg.host->b_hnp_enable) {
pr_debug("!b_conn && b_hnp_enable");
/* Clear AIDL_BDIS timer */
msm_otg_del_timer(dev);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_PERIPHERAL;
spin_unlock_irq(&dev->lock);
msm_otg_start_host(&dev->otg, REQUEST_HNP_SUSPEND);
/* We may come here even when B-dev is physically
* disconnected during HNP. We go back to host
* role if bus is idle for BIDL_ADIS time.
*/
dev->otg.gadget->is_a_peripheral = 1;
msm_otg_start_peripheral(&dev->otg, 1);
} else if (!test_bit(B_CONN, &dev->inputs) &&
!dev->otg.host->b_hnp_enable) {
pr_debug("!b_conn && !b_hnp_enable");
/* bus request is dropped during suspend.
* acquire again for next device.
*/
set_bit(A_BUS_REQ, &dev->inputs);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_BCON;
spin_unlock_irq(&dev->lock);
msm_otg_start_timer(dev, TA_WAIT_BCON, A_WAIT_BCON);
}
break;
case OTG_STATE_A_PERIPHERAL:
if (test_bit(ID, &dev->inputs) ||
test_bit(A_BUS_DROP, &dev->inputs)) {
pr_debug("id || a_bus_drop\n");
/* Clear BIDL_ADIS timer */
msm_otg_del_timer(dev);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_VFALL;
spin_unlock_irq(&dev->lock);
msm_otg_start_peripheral(&dev->otg, 0);
dev->otg.gadget->is_a_peripheral = 0;
/* HCD was suspended before. Stop it now */
msm_otg_start_host(&dev->otg, REQUEST_STOP);
dev->pdata->vbus_power(USB_PHY_INTEGRATED, 0);
msm_otg_start_timer(dev, TA_WAIT_VFALL, A_WAIT_VFALL);
} else if (!test_bit(A_VBUS_VLD, &dev->inputs)) {
pr_debug("!a_vbus_vld\n");
/* Clear BIDL_ADIS timer */
msm_otg_del_timer(dev);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_VBUS_ERR;
spin_unlock_irq(&dev->lock);
msm_otg_start_peripheral(&dev->otg, 0);
dev->otg.gadget->is_a_peripheral = 0;
/* HCD was suspended before. Stop it now */
msm_otg_start_host(&dev->otg, REQUEST_STOP);
} else if (test_bit(A_BIDL_ADIS, &dev->tmouts)) {
pr_debug("a_bidl_adis_tmout\n");
msm_otg_start_peripheral(&dev->otg, 0);
dev->otg.gadget->is_a_peripheral = 0;
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_BCON;
spin_unlock_irq(&dev->lock);
set_bit(A_BUS_REQ, &dev->inputs);
msm_otg_start_host(&dev->otg, REQUEST_HNP_RESUME);
msm_otg_start_timer(dev, TA_WAIT_BCON, A_WAIT_BCON);
}
break;
case OTG_STATE_A_WAIT_VFALL:
if (test_bit(A_WAIT_VFALL, &dev->tmouts)) {
clear_bit(A_VBUS_VLD, &dev->inputs);
/* Reset both phy and link */
otg_reset(dev, 1);
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_IDLE;
spin_unlock_irq(&dev->lock);
work = 1;
}
break;
case OTG_STATE_A_VBUS_ERR:
if (test_bit(ID, &dev->inputs) ||
test_bit(A_BUS_DROP, &dev->inputs) ||
test_bit(A_CLR_ERR, &dev->inputs)) {
spin_lock_irq(&dev->lock);
dev->otg.state = OTG_STATE_A_WAIT_VFALL;
spin_unlock_irq(&dev->lock);
dev->pdata->vbus_power(USB_PHY_INTEGRATED, 0);
msm_otg_start_timer(dev, TA_WAIT_VFALL, A_WAIT_VFALL);
}
break;
default:
pr_err("invalid OTG state\n");
}
if (work)
queue_work(dev->wq, &dev->sm_work);
/* IRQ/sysfs may queue work. Check work_pending. otherwise
* we might endup releasing wakelock after it is acquired
* in IRQ/sysfs.
*/
if (!work_pending(&dev->sm_work) && !hrtimer_active(&dev->timer))
wake_unlock(&dev->wlock);
}
static int msm_otg_suspend(struct msm_otg *dev)
{
unsigned long timeout;
int vbus = 0;
unsigned otgsc;
disable_irq(dev->irq);
if (dev->in_lpm)
goto out;
/* Don't reset if mini-A cable is connected */
if (!is_host())
otg_reset(dev);
/* In case of fast plug-in and plug-out inside the otg_reset() the
* servicing of BSV is missed (in the window of after phy and link
* reset). Handle it if any missing bsv is detected */
if (is_b_sess_vld() && !is_host()) {
otgsc = readl(USB_OTGSC);
writel(otgsc, USB_OTGSC);
pr_info("%s:Process mising BSV\n", __func__);
msm_otg_start_peripheral(&dev->otg, 1);
enable_irq(dev->irq);
return -1;
}
ulpi_read(dev, 0x14);/* clear PHY interrupt latch register */
/* If there is no pmic notify support turn on phy comparators. */
if (!dev->pmic_notif_supp)
ulpi_write(dev, 0x01, 0x30);
ulpi_write(dev, 0x08, 0x09);/* turn off PLL on integrated phy */
timeout = jiffies + msecs_to_jiffies(500);
disable_phy_clk();
while (!is_phy_clk_disabled()) {
if (time_after(jiffies, timeout)) {
pr_err("%s: Unable to suspend phy\n", __func__);
otg_reset(dev);
goto out;
}
msleep(1);
}
writel(readl(USB_USBCMD) | ASYNC_INTR_CTRL | ULPI_STP_CTRL, USB_USBCMD);
clk_disable(dev->pclk);
if (dev->cclk)
clk_disable(dev->cclk);
if (device_may_wakeup(dev->otg.dev)) {
enable_irq_wake(dev->irq);
if (dev->vbus_on_irq)
enable_irq_wake(dev->vbus_on_irq);
}
dev->in_lpm = 1;
if (!vbus && dev->pmic_notif_supp)
dev->pmic_enable_ldo(0);
pr_info("%s: usb in low power mode\n", __func__);
out:
enable_irq(dev->irq);
/* TBD: as there is no bus suspend implemented as of now
* it should be dummy check
*/
return 0;
}
