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path: root/drivers/usb/dwc2/hcd.c
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Diffstat (limited to 'drivers/usb/dwc2/hcd.c')
-rw-r--r--drivers/usb/dwc2/hcd.c646
1 files changed, 508 insertions, 138 deletions
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index fc3269f5faf1..035d4911a3c3 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -56,8 +56,6 @@
#include "core.h"
#include "hcd.h"
-static void dwc2_port_resume(struct dwc2_hsotg *hsotg);
-
/*
* =========================================================================
* Host Core Layer Functions
@@ -3208,6 +3206,15 @@ static void dwc2_conn_id_status_change(struct work_struct *work)
if (count > 250)
dev_err(hsotg->dev,
"Connection id status change timed out\n");
+
+ /*
+ * Exit Partial Power Down without restoring registers.
+ * No need to check the return value as registers
+ * are not being restored.
+ */
+ if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2)
+ dwc2_exit_partial_power_down(hsotg, 0, false);
+
hsotg->op_state = OTG_STATE_B_PERIPHERAL;
dwc2_core_init(hsotg, false);
dwc2_enable_global_interrupts(hsotg);
@@ -3277,13 +3284,23 @@ static int dwc2_host_is_b_hnp_enabled(struct dwc2_hsotg *hsotg)
return hcd->self.b_hnp_enable;
}
-/* Must NOT be called with interrupt disabled or spinlock held */
-static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
+/**
+ * dwc2_port_suspend() - Put controller in suspend mode for host.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ * @windex: The control request wIndex field
+ *
+ * Return: non-zero if failed to enter suspend mode for host.
+ *
+ * This function is for entering Host mode suspend.
+ * Must NOT be called with interrupt disabled or spinlock held.
+ */
+int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
{
unsigned long flags;
- u32 hprt0;
u32 pcgctl;
u32 gotgctl;
+ int ret = 0;
dev_dbg(hsotg->dev, "%s()\n", __func__);
@@ -3296,22 +3313,33 @@ static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
hsotg->op_state = OTG_STATE_A_SUSPEND;
}
- hprt0 = dwc2_read_hprt0(hsotg);
- hprt0 |= HPRT0_SUSP;
- dwc2_writel(hsotg, hprt0, HPRT0);
-
- hsotg->bus_suspended = true;
-
- /*
- * If power_down is supported, Phy clock will be suspended
- * after registers are backuped.
- */
- if (!hsotg->params.power_down) {
- /* Suspend the Phy Clock */
- pcgctl = dwc2_readl(hsotg, PCGCTL);
- pcgctl |= PCGCTL_STOPPCLK;
- dwc2_writel(hsotg, pcgctl, PCGCTL);
- udelay(10);
+ switch (hsotg->params.power_down) {
+ case DWC2_POWER_DOWN_PARAM_PARTIAL:
+ ret = dwc2_enter_partial_power_down(hsotg);
+ if (ret)
+ dev_err(hsotg->dev,
+ "enter partial_power_down failed.\n");
+ break;
+ case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ /*
+ * Perform spin unlock and lock because in
+ * "dwc2_host_enter_hibernation()" function there is a spinlock
+ * logic which prevents servicing of any IRQ during entering
+ * hibernation.
+ */
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ ret = dwc2_enter_hibernation(hsotg, 1);
+ if (ret)
+ dev_err(hsotg->dev, "enter hibernation failed.\n");
+ spin_lock_irqsave(&hsotg->lock, flags);
+ break;
+ case DWC2_POWER_DOWN_PARAM_NONE:
+ /*
+ * If not hibernation nor partial power down are supported,
+ * clock gating is used to save power.
+ */
+ dwc2_host_enter_clock_gating(hsotg);
+ break;
}
/* For HNP the bus must be suspended for at least 200ms */
@@ -3326,44 +3354,54 @@ static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
} else {
spin_unlock_irqrestore(&hsotg->lock, flags);
}
+
+ return ret;
}
-/* Must NOT be called with interrupt disabled or spinlock held */
-static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
+/**
+ * dwc2_port_resume() - Exit controller from suspend mode for host.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ *
+ * Return: non-zero if failed to exit suspend mode for host.
+ *
+ * This function is for exiting Host mode suspend.
+ * Must NOT be called with interrupt disabled or spinlock held.
+ */
+int dwc2_port_resume(struct dwc2_hsotg *hsotg)
{
unsigned long flags;
- u32 hprt0;
- u32 pcgctl;
+ int ret = 0;
spin_lock_irqsave(&hsotg->lock, flags);
- /*
- * If power_down is supported, Phy clock is already resumed
- * after registers restore.
- */
- if (!hsotg->params.power_down) {
- pcgctl = dwc2_readl(hsotg, PCGCTL);
- pcgctl &= ~PCGCTL_STOPPCLK;
- dwc2_writel(hsotg, pcgctl, PCGCTL);
+ switch (hsotg->params.power_down) {
+ case DWC2_POWER_DOWN_PARAM_PARTIAL:
+ ret = dwc2_exit_partial_power_down(hsotg, 0, true);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit partial_power_down failed.\n");
+ break;
+ case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ /* Exit host hibernation. */
+ ret = dwc2_exit_hibernation(hsotg, 0, 0, 1);
+ if (ret)
+ dev_err(hsotg->dev, "exit hibernation failed.\n");
+ break;
+ case DWC2_POWER_DOWN_PARAM_NONE:
+ /*
+ * If not hibernation nor partial power down are supported,
+ * port resume is done using the clock gating programming flow.
+ */
spin_unlock_irqrestore(&hsotg->lock, flags);
- msleep(20);
+ dwc2_host_exit_clock_gating(hsotg, 0);
spin_lock_irqsave(&hsotg->lock, flags);
+ break;
}
- hprt0 = dwc2_read_hprt0(hsotg);
- hprt0 |= HPRT0_RES;
- hprt0 &= ~HPRT0_SUSP;
- dwc2_writel(hsotg, hprt0, HPRT0);
spin_unlock_irqrestore(&hsotg->lock, flags);
- msleep(USB_RESUME_TIMEOUT);
-
- spin_lock_irqsave(&hsotg->lock, flags);
- hprt0 = dwc2_read_hprt0(hsotg);
- hprt0 &= ~(HPRT0_RES | HPRT0_SUSP);
- dwc2_writel(hsotg, hprt0, HPRT0);
- hsotg->bus_suspended = false;
- spin_unlock_irqrestore(&hsotg->lock, flags);
+ return ret;
}
/* Handles hub class-specific requests */
@@ -3413,12 +3451,8 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
dev_dbg(hsotg->dev,
"ClearPortFeature USB_PORT_FEAT_SUSPEND\n");
- if (hsotg->bus_suspended) {
- if (hsotg->hibernated)
- dwc2_exit_hibernation(hsotg, 0, 0, 1);
- else
- dwc2_port_resume(hsotg);
- }
+ if (hsotg->bus_suspended)
+ retval = dwc2_port_resume(hsotg);
break;
case USB_PORT_FEAT_POWER:
@@ -3629,10 +3663,8 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
"SetPortFeature - USB_PORT_FEAT_SUSPEND\n");
if (windex != hsotg->otg_port)
goto error;
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_HIBERNATION)
- dwc2_enter_hibernation(hsotg, 1);
- else
- dwc2_port_suspend(hsotg, windex);
+ if (!hsotg->bus_suspended)
+ retval = dwc2_port_suspend(hsotg, windex);
break;
case USB_PORT_FEAT_POWER:
@@ -3647,12 +3679,30 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
break;
case USB_PORT_FEAT_RESET:
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_HIBERNATION &&
- hsotg->hibernated)
- dwc2_exit_hibernation(hsotg, 0, 1, 1);
- hprt0 = dwc2_read_hprt0(hsotg);
dev_dbg(hsotg->dev,
"SetPortFeature - USB_PORT_FEAT_RESET\n");
+
+ hprt0 = dwc2_read_hprt0(hsotg);
+
+ if (hsotg->hibernated) {
+ retval = dwc2_exit_hibernation(hsotg, 0, 1, 1);
+ if (retval)
+ dev_err(hsotg->dev,
+ "exit hibernation failed\n");
+ }
+
+ if (hsotg->in_ppd) {
+ retval = dwc2_exit_partial_power_down(hsotg, 1,
+ true);
+ if (retval)
+ dev_err(hsotg->dev,
+ "exit partial_power_down failed\n");
+ }
+
+ if (hsotg->params.power_down ==
+ DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
+ dwc2_host_exit_clock_gating(hsotg, 0);
+
pcgctl = dwc2_readl(hsotg, PCGCTL);
pcgctl &= ~(PCGCTL_ENBL_SLEEP_GATING | PCGCTL_STOPPCLK);
dwc2_writel(hsotg, pcgctl, PCGCTL);
@@ -4305,8 +4355,6 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
unsigned long flags;
int ret = 0;
- u32 hprt0;
- u32 pcgctl;
spin_lock_irqsave(&hsotg->lock, flags);
@@ -4322,46 +4370,51 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
if (hsotg->op_state == OTG_STATE_B_PERIPHERAL)
goto unlock;
- if (hsotg->params.power_down > DWC2_POWER_DOWN_PARAM_PARTIAL)
+ if (hsotg->bus_suspended)
goto skip_power_saving;
- /*
- * Drive USB suspend and disable port Power
- * if usb bus is not suspended.
- */
- if (!hsotg->bus_suspended) {
- hprt0 = dwc2_read_hprt0(hsotg);
- if (hprt0 & HPRT0_CONNSTS) {
- hprt0 |= HPRT0_SUSP;
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_PARTIAL)
- hprt0 &= ~HPRT0_PWR;
- dwc2_writel(hsotg, hprt0, HPRT0);
- }
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_PARTIAL) {
- spin_unlock_irqrestore(&hsotg->lock, flags);
- dwc2_vbus_supply_exit(hsotg);
- spin_lock_irqsave(&hsotg->lock, flags);
- } else {
- pcgctl = readl(hsotg->regs + PCGCTL);
- pcgctl |= PCGCTL_STOPPCLK;
- writel(pcgctl, hsotg->regs + PCGCTL);
- }
- }
+ if (hsotg->flags.b.port_connect_status == 0)
+ goto skip_power_saving;
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_PARTIAL) {
+ switch (hsotg->params.power_down) {
+ case DWC2_POWER_DOWN_PARAM_PARTIAL:
/* Enter partial_power_down */
ret = dwc2_enter_partial_power_down(hsotg);
- if (ret) {
- if (ret != -ENOTSUPP)
- dev_err(hsotg->dev,
- "enter partial_power_down failed\n");
- goto skip_power_saving;
- }
+ if (ret)
+ dev_err(hsotg->dev,
+ "enter partial_power_down failed\n");
+ /* After entering suspend, hardware is not accessible */
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
+ case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ /* Enter hibernation */
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ ret = dwc2_enter_hibernation(hsotg, 1);
+ if (ret)
+ dev_err(hsotg->dev, "enter hibernation failed\n");
+ spin_lock_irqsave(&hsotg->lock, flags);
+
+ /* After entering suspend, hardware is not accessible */
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
+ case DWC2_POWER_DOWN_PARAM_NONE:
+ /*
+ * If not hibernation nor partial power down are supported,
+ * clock gating is used to save power.
+ */
+ dwc2_host_enter_clock_gating(hsotg);
- /* After entering partial_power_down, hardware is no more accessible */
+ /* After entering suspend, hardware is not accessible */
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
+ default:
+ goto skip_power_saving;
}
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ dwc2_vbus_supply_exit(hsotg);
+ spin_lock_irqsave(&hsotg->lock, flags);
+
/* Ask phy to be suspended */
if (!IS_ERR_OR_NULL(hsotg->uphy)) {
spin_unlock_irqrestore(&hsotg->lock, flags);
@@ -4381,7 +4434,7 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd)
{
struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
unsigned long flags;
- u32 pcgctl;
+ u32 hprt0;
int ret = 0;
spin_lock_irqsave(&hsotg->lock, flags);
@@ -4392,68 +4445,102 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd)
if (hsotg->lx_state != DWC2_L2)
goto unlock;
- if (hsotg->params.power_down > DWC2_POWER_DOWN_PARAM_PARTIAL) {
+ hprt0 = dwc2_read_hprt0(hsotg);
+
+ /*
+ * Added port connection status checking which prevents exiting from
+ * Partial Power Down mode from _dwc2_hcd_resume() if not in Partial
+ * Power Down mode.
+ */
+ if (hprt0 & HPRT0_CONNSTS) {
hsotg->lx_state = DWC2_L0;
goto unlock;
}
- /*
- * Enable power if not already done.
- * This must not be spinlocked since duration
- * of this call is unknown.
- */
- if (!IS_ERR_OR_NULL(hsotg->uphy)) {
+ switch (hsotg->params.power_down) {
+ case DWC2_POWER_DOWN_PARAM_PARTIAL:
+ ret = dwc2_exit_partial_power_down(hsotg, 0, true);
+ if (ret)
+ dev_err(hsotg->dev,
+ "exit partial_power_down failed\n");
+ /*
+ * Set HW accessible bit before powering on the controller
+ * since an interrupt may rise.
+ */
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
+ case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+ ret = dwc2_exit_hibernation(hsotg, 0, 0, 1);
+ if (ret)
+ dev_err(hsotg->dev, "exit hibernation failed.\n");
+
+ /*
+ * Set HW accessible bit before powering on the controller
+ * since an interrupt may rise.
+ */
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
+ case DWC2_POWER_DOWN_PARAM_NONE:
+ /*
+ * If not hibernation nor partial power down are supported,
+ * port resume is done using the clock gating programming flow.
+ */
spin_unlock_irqrestore(&hsotg->lock, flags);
- usb_phy_set_suspend(hsotg->uphy, false);
+ dwc2_host_exit_clock_gating(hsotg, 0);
+
+ /*
+ * Initialize the Core for Host mode, as after system resume
+ * the global interrupts are disabled.
+ */
+ dwc2_core_init(hsotg, false);
+ dwc2_enable_global_interrupts(hsotg);
+ dwc2_hcd_reinit(hsotg);
spin_lock_irqsave(&hsotg->lock, flags);
- }
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_PARTIAL) {
/*
* Set HW accessible bit before powering on the controller
* since an interrupt may rise.
*/
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ break;
+ default:
+ hsotg->lx_state = DWC2_L0;
+ goto unlock;
+ }
+ /* Change Root port status, as port status change occurred after resume.*/
+ hsotg->flags.b.port_suspend_change = 1;
- /* Exit partial_power_down */
- ret = dwc2_exit_partial_power_down(hsotg, true);
- if (ret && (ret != -ENOTSUPP))
- dev_err(hsotg->dev, "exit partial_power_down failed\n");
- } else {
- pcgctl = readl(hsotg->regs + PCGCTL);
- pcgctl &= ~PCGCTL_STOPPCLK;
- writel(pcgctl, hsotg->regs + PCGCTL);
+ /*
+ * Enable power if not already done.
+ * This must not be spinlocked since duration
+ * of this call is unknown.
+ */
+ if (!IS_ERR_OR_NULL(hsotg->uphy)) {
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ usb_phy_set_suspend(hsotg->uphy, false);
+ spin_lock_irqsave(&hsotg->lock, flags);
}
- hsotg->lx_state = DWC2_L0;
-
+ /* Enable external vbus supply after resuming the port. */
spin_unlock_irqrestore(&hsotg->lock, flags);
+ dwc2_vbus_supply_init(hsotg);
- if (hsotg->bus_suspended) {
- spin_lock_irqsave(&hsotg->lock, flags);
- hsotg->flags.b.port_suspend_change = 1;
- spin_unlock_irqrestore(&hsotg->lock, flags);
- dwc2_port_resume(hsotg);
- } else {
- if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_PARTIAL) {
- dwc2_vbus_supply_init(hsotg);
-
- /* Wait for controller to correctly update D+/D- level */
- usleep_range(3000, 5000);
- }
+ /* Wait for controller to correctly update D+/D- level */
+ usleep_range(3000, 5000);
+ spin_lock_irqsave(&hsotg->lock, flags);
- /*
- * Clear Port Enable and Port Status changes.
- * Enable Port Power.
- */
- dwc2_writel(hsotg, HPRT0_PWR | HPRT0_CONNDET |
- HPRT0_ENACHG, HPRT0);
- /* Wait for controller to detect Port Connect */
- usleep_range(5000, 7000);
- }
+ /*
+ * Clear Port Enable and Port Status changes.
+ * Enable Port Power.
+ */
+ dwc2_writel(hsotg, HPRT0_PWR | HPRT0_CONNDET |
+ HPRT0_ENACHG, HPRT0);
- return ret;
+ /* Wait for controller to detect Port Connect */
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ usleep_range(5000, 7000);
+ spin_lock_irqsave(&hsotg->lock, flags);
unlock:
spin_unlock_irqrestore(&hsotg->lock, flags);
@@ -4564,12 +4651,41 @@ static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
struct dwc2_qh *qh;
bool qh_allocated = false;
struct dwc2_qtd *qtd;
+ struct dwc2_gregs_backup *gr;
+
+ gr = &hsotg->gr_backup;
if (dbg_urb(urb)) {
dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n");
dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
}
+ if (hsotg->hibernated) {
+ if (gr->gotgctl & GOTGCTL_CURMODE_HOST)
+ retval = dwc2_exit_hibernation(hsotg, 0, 0, 1);
+ else
+ retval = dwc2_exit_hibernation(hsotg, 0, 0, 0);
+
+ if (retval)
+ dev_err(hsotg->dev,
+ "exit hibernation failed.\n");
+ }
+
+ if (hsotg->in_ppd) {
+ retval = dwc2_exit_partial_power_down(hsotg, 0, true);
+ if (retval)
+ dev_err(hsotg->dev,
+ "exit partial_power_down failed\n");
+ }
+
+ if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE &&
+ hsotg->bus_suspended) {
+ if (dwc2_is_device_mode(hsotg))
+ dwc2_gadget_exit_clock_gating(hsotg, 0);
+ else
+ dwc2_host_exit_clock_gating(hsotg, 0);
+ }
+
if (!ep)
return -EINVAL;
@@ -5398,7 +5514,7 @@ int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg)
dwc2_writel(hsotg, hprt0, HPRT0);
/* Wait for the HPRT0.PrtSusp register field to be set */
- if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
+ if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 5000))
dev_warn(hsotg->dev, "Suspend wasn't generated\n");
/*
@@ -5579,7 +5695,15 @@ int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
return ret;
}
- dwc2_hcd_rem_wakeup(hsotg);
+ if (rem_wakeup) {
+ dwc2_hcd_rem_wakeup(hsotg);
+ /*
+ * Change "port_connect_status_change" flag to re-enumerate,
+ * because after exit from hibernation port connection status
+ * is not detected.
+ */
+ hsotg->flags.b.port_connect_status_change = 1;
+ }
hsotg->hibernated = 0;
hsotg->bus_suspended = 0;
@@ -5606,3 +5730,249 @@ bool dwc2_host_can_poweroff_phy(struct dwc2_hsotg *dwc2)
/* No reason to keep the PHY powered, so allow poweroff */
return true;
}
+
+/**
+ * dwc2_host_enter_partial_power_down() - Put controller in partial
+ * power down.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ *
+ * Return: non-zero if failed to enter host partial power down.
+ *
+ * This function is for entering Host mode partial power down.
+ */
+int dwc2_host_enter_partial_power_down(struct dwc2_hsotg *hsotg)
+{
+ u32 pcgcctl;
+ u32 hprt0;
+ int ret = 0;
+
+ dev_dbg(hsotg->dev, "Entering host partial power down started.\n");
+
+ /* Put this port in suspend mode. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 |= HPRT0_SUSP;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+ udelay(5);
+
+ /* Wait for the HPRT0.PrtSusp register field to be set */
+ if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
+ dev_warn(hsotg->dev, "Suspend wasn't generated\n");
+
+ /* Backup all registers */
+ ret = dwc2_backup_global_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to backup global registers\n",
+ __func__);
+ return ret;
+ }
+
+ ret = dwc2_backup_host_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to backup host registers\n",
+ __func__);
+ return ret;
+ }
+
+ /*
+ * Clear any pending interrupts since dwc2 will not be able to
+ * clear them after entering partial_power_down.
+ */
+ dwc2_writel(hsotg, 0xffffffff, GINTSTS);
+
+ /* Put the controller in low power state */
+ pcgcctl = dwc2_readl(hsotg, PCGCTL);
+
+ pcgcctl |= PCGCTL_PWRCLMP;
+ dwc2_writel(hsotg, pcgcctl, PCGCTL);
+ udelay(5);
+
+ pcgcctl |= PCGCTL_RSTPDWNMODULE;
+ dwc2_writel(hsotg, pcgcctl, PCGCTL);
+ udelay(5);
+
+ pcgcctl |= PCGCTL_STOPPCLK;
+ dwc2_writel(hsotg, pcgcctl, PCGCTL);
+
+ /* Set in_ppd flag to 1 as here core enters suspend. */
+ hsotg->in_ppd = 1;
+ hsotg->lx_state = DWC2_L2;
+ hsotg->bus_suspended = true;
+
+ dev_dbg(hsotg->dev, "Entering host partial power down completed.\n");
+
+ return ret;
+}
+
+/*
+ * dwc2_host_exit_partial_power_down() - Exit controller from host partial
+ * power down.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ * @rem_wakeup: indicates whether resume is initiated by Reset.
+ * @restore: indicates whether need to restore the registers or not.
+ *
+ * Return: non-zero if failed to exit host partial power down.
+ *
+ * This function is for exiting from Host mode partial power down.
+ */
+int dwc2_host_exit_partial_power_down(struct dwc2_hsotg *hsotg,
+ int rem_wakeup, bool restore)
+{
+ u32 pcgcctl;
+ int ret = 0;
+ u32 hprt0;
+
+ dev_dbg(hsotg->dev, "Exiting host partial power down started.\n");
+
+ pcgcctl = dwc2_readl(hsotg, PCGCTL);
+ pcgcctl &= ~PCGCTL_STOPPCLK;
+ dwc2_writel(hsotg, pcgcctl, PCGCTL);
+ udelay(5);
+
+ pcgcctl = dwc2_readl(hsotg, PCGCTL);
+ pcgcctl &= ~PCGCTL_PWRCLMP;
+ dwc2_writel(hsotg, pcgcctl, PCGCTL);
+ udelay(5);
+
+ pcgcctl = dwc2_readl(hsotg, PCGCTL);
+ pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
+ dwc2_writel(hsotg, pcgcctl, PCGCTL);
+
+ udelay(100);
+ if (restore) {
+ ret = dwc2_restore_global_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to restore registers\n",
+ __func__);
+ return ret;
+ }
+
+ ret = dwc2_restore_host_registers(hsotg);
+ if (ret) {
+ dev_err(hsotg->dev, "%s: failed to restore host registers\n",
+ __func__);
+ return ret;
+ }
+ }
+
+ /* Drive resume signaling and exit suspend mode on the port. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 |= HPRT0_RES;
+ hprt0 &= ~HPRT0_SUSP;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+ udelay(5);
+
+ if (!rem_wakeup) {
+ /* Stop driveing resume signaling on the port. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 &= ~HPRT0_RES;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+
+ hsotg->bus_suspended = false;
+ } else {
+ /* Turn on the port power bit. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 |= HPRT0_PWR;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+
+ /* Connect hcd. */
+ dwc2_hcd_connect(hsotg);
+
+ mod_timer(&hsotg->wkp_timer,
+ jiffies + msecs_to_jiffies(71));
+ }
+
+ /* Set lx_state to and in_ppd to 0 as here core exits from suspend. */
+ hsotg->in_ppd = 0;
+ hsotg->lx_state = DWC2_L0;
+
+ dev_dbg(hsotg->dev, "Exiting host partial power down completed.\n");
+ return ret;
+}
+
+/**
+ * dwc2_host_enter_clock_gating() - Put controller in clock gating.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ *
+ * This function is for entering Host mode clock gating.
+ */
+void dwc2_host_enter_clock_gating(struct dwc2_hsotg *hsotg)
+{
+ u32 hprt0;
+ u32 pcgctl;
+
+ dev_dbg(hsotg->dev, "Entering host clock gating.\n");
+
+ /* Put this port in suspend mode. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 |= HPRT0_SUSP;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+
+ /* Set the Phy Clock bit as suspend is received. */
+ pcgctl = dwc2_readl(hsotg, PCGCTL);
+ pcgctl |= PCGCTL_STOPPCLK;
+ dwc2_writel(hsotg, pcgctl, PCGCTL);
+ udelay(5);
+
+ /* Set the Gate hclk as suspend is received. */
+ pcgctl = dwc2_readl(hsotg, PCGCTL);
+ pcgctl |= PCGCTL_GATEHCLK;
+ dwc2_writel(hsotg, pcgctl, PCGCTL);
+ udelay(5);
+
+ hsotg->bus_suspended = true;
+ hsotg->lx_state = DWC2_L2;
+}
+
+/**
+ * dwc2_host_exit_clock_gating() - Exit controller from clock gating.
+ *
+ * @hsotg: Programming view of the DWC_otg controller
+ * @rem_wakeup: indicates whether resume is initiated by remote wakeup
+ *
+ * This function is for exiting Host mode clock gating.
+ */
+void dwc2_host_exit_clock_gating(struct dwc2_hsotg *hsotg, int rem_wakeup)
+{
+ u32 hprt0;
+ u32 pcgctl;
+
+ dev_dbg(hsotg->dev, "Exiting host clock gating.\n");
+
+ /* Clear the Gate hclk. */
+ pcgctl = dwc2_readl(hsotg, PCGCTL);
+ pcgctl &= ~PCGCTL_GATEHCLK;
+ dwc2_writel(hsotg, pcgctl, PCGCTL);
+ udelay(5);
+
+ /* Phy Clock bit. */
+ pcgctl = dwc2_readl(hsotg, PCGCTL);
+ pcgctl &= ~PCGCTL_STOPPCLK;
+ dwc2_writel(hsotg, pcgctl, PCGCTL);
+ udelay(5);
+
+ /* Drive resume signaling and exit suspend mode on the port. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 |= HPRT0_RES;
+ hprt0 &= ~HPRT0_SUSP;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+ udelay(5);
+
+ if (!rem_wakeup) {
+ /* In case of port resume need to wait for 40 ms */
+ msleep(USB_RESUME_TIMEOUT);
+
+ /* Stop driveing resume signaling on the port. */
+ hprt0 = dwc2_read_hprt0(hsotg);
+ hprt0 &= ~HPRT0_RES;
+ dwc2_writel(hsotg, hprt0, HPRT0);
+
+ hsotg->bus_suspended = false;
+ hsotg->lx_state = DWC2_L0;
+ } else {
+ mod_timer(&hsotg->wkp_timer,
+ jiffies + msecs_to_jiffies(71));
+ }
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-05 02:58:28 +0300