* - USB_DR_MODE_PERIPHERAL
* - USB_DR_MODE_HOST
* - USB_DR_MODE_OTG
- * @role_sw: usb_role_switch handle
* @hcd_enabled: Host mode sub-driver initialization indicator.
* @gadget_enabled: Peripheral mode sub-driver initialization indicator.
* @ll_hw_enabled: Status of low-level hardware resources.
struct dwc2_core_params params;
enum usb_otg_state op_state;
enum usb_dr_mode dr_mode;
- struct usb_role_switch *role_sw;
unsigned int hcd_enabled:1;
unsigned int gadget_enabled:1;
unsigned int ll_hw_enabled:1;
return (dwc2_readl(hsotg, GINTSTS) & GINTSTS_CURMODE_HOST) == 0;
}
-int dwc2_drd_init(struct dwc2_hsotg *hsotg);
-void dwc2_drd_suspend(struct dwc2_hsotg *hsotg);
-void dwc2_drd_resume(struct dwc2_hsotg *hsotg);
-void dwc2_drd_exit(struct dwc2_hsotg *hsotg);
-
/*
* Dump core registers and SPRAM
*/
int dwc2_gadget_init(struct dwc2_hsotg *hsotg);
void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2,
bool reset);
-void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg);
void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg);
void dwc2_hsotg_disconnect(struct dwc2_hsotg *dwc2);
int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode);
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * drd.c - DesignWare USB2 DRD Controller Dual-role support
- *
- * Copyright (C) 2020 STMicroelectronics
- *
- * Author(s): Amelie Delaunay <amelie.delaunay@st.com>
- */
-
-#include <linux/iopoll.h>
-#include <linux/platform_device.h>
-#include <linux/usb/role.h>
-#include "core.h"
-
-static void dwc2_ovr_init(struct dwc2_hsotg *hsotg)
-{
- unsigned long flags;
- u32 gotgctl;
-
- spin_lock_irqsave(&hsotg->lock, flags);
-
- gotgctl = dwc2_readl(hsotg, GOTGCTL);
- gotgctl |= GOTGCTL_BVALOEN | GOTGCTL_AVALOEN | GOTGCTL_VBVALOEN;
- gotgctl |= GOTGCTL_DBNCE_FLTR_BYPASS;
- gotgctl &= ~(GOTGCTL_BVALOVAL | GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL);
- dwc2_writel(hsotg, gotgctl, GOTGCTL);
-
- dwc2_force_mode(hsotg, false);
-
- spin_unlock_irqrestore(&hsotg->lock, flags);
-}
-
-static int dwc2_ovr_avalid(struct dwc2_hsotg *hsotg, bool valid)
-{
- u32 gotgctl = dwc2_readl(hsotg, GOTGCTL);
-
- /* Check if A-Session is already in the right state */
- if ((valid && (gotgctl & GOTGCTL_ASESVLD)) ||
- (!valid && !(gotgctl & GOTGCTL_ASESVLD)))
- return -EALREADY;
-
- if (valid)
- gotgctl |= GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL;
- else
- gotgctl &= ~(GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL);
- dwc2_writel(hsotg, gotgctl, GOTGCTL);
-
- return 0;
-}
-
-static int dwc2_ovr_bvalid(struct dwc2_hsotg *hsotg, bool valid)
-{
- u32 gotgctl = dwc2_readl(hsotg, GOTGCTL);
-
- /* Check if B-Session is already in the right state */
- if ((valid && (gotgctl & GOTGCTL_BSESVLD)) ||
- (!valid && !(gotgctl & GOTGCTL_BSESVLD)))
- return -EALREADY;
-
- if (valid)
- gotgctl |= GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL;
- else
- gotgctl &= ~(GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL);
- dwc2_writel(hsotg, gotgctl, GOTGCTL);
-
- return 0;
-}
-
-static int dwc2_drd_role_sw_set(struct usb_role_switch *sw, enum usb_role role)
-{
- struct dwc2_hsotg *hsotg = usb_role_switch_get_drvdata(sw);
- unsigned long flags;
-
- /* Skip session not in line with dr_mode */
- if ((role == USB_ROLE_DEVICE && hsotg->dr_mode == USB_DR_MODE_HOST) ||
- (role == USB_ROLE_HOST && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL))
- return -EINVAL;
-
- /* Skip session if core is in test mode */
- if (role == USB_ROLE_NONE && hsotg->test_mode) {
- dev_dbg(hsotg->dev, "Core is in test mode\n");
- return -EBUSY;
- }
-
- spin_lock_irqsave(&hsotg->lock, flags);
-
- if (role == USB_ROLE_HOST) {
- if (dwc2_ovr_avalid(hsotg, true))
- goto unlock;
-
- if (hsotg->dr_mode == USB_DR_MODE_OTG)
- /*
- * This will raise a Connector ID Status Change
- * Interrupt - connID A
- */
- dwc2_force_mode(hsotg, true);
- } else if (role == USB_ROLE_DEVICE) {
- if (dwc2_ovr_bvalid(hsotg, true))
- goto unlock;
-
- if (hsotg->dr_mode == USB_DR_MODE_OTG)
- /*
- * This will raise a Connector ID Status Change
- * Interrupt - connID B
- */
- dwc2_force_mode(hsotg, false);
-
- /* This clear DCTL.SFTDISCON bit */
- dwc2_hsotg_core_connect(hsotg);
- } else {
- if (dwc2_is_device_mode(hsotg)) {
- if (!dwc2_ovr_bvalid(hsotg, false))
- /* This set DCTL.SFTDISCON bit */
- dwc2_hsotg_core_disconnect(hsotg);
- } else {
- dwc2_ovr_avalid(hsotg, false);
- }
- }
-
-unlock:
- spin_unlock_irqrestore(&hsotg->lock, flags);
-
- dev_dbg(hsotg->dev, "%s-session valid\n",
- role == USB_ROLE_NONE ? "No" :
- role == USB_ROLE_HOST ? "A" : "B");
-
- return 0;
-}
-
-int dwc2_drd_init(struct dwc2_hsotg *hsotg)
-{
- struct usb_role_switch_desc role_sw_desc = {0};
- struct usb_role_switch *role_sw;
- int ret;
-
- if (!device_property_read_bool(hsotg->dev, "usb-role-switch"))
- return 0;
-
- role_sw_desc.driver_data = hsotg;
- role_sw_desc.fwnode = dev_fwnode(hsotg->dev);
- role_sw_desc.set = dwc2_drd_role_sw_set;
- role_sw_desc.allow_userspace_control = true;
-
- role_sw = usb_role_switch_register(hsotg->dev, &role_sw_desc);
- if (IS_ERR(role_sw)) {
- ret = PTR_ERR(role_sw);
- dev_err(hsotg->dev,
- "failed to register role switch: %d\n", ret);
- return ret;
- }
-
- hsotg->role_sw = role_sw;
-
- /* Enable override and initialize values */
- dwc2_ovr_init(hsotg);
-
- return 0;
-}
-
-void dwc2_drd_suspend(struct dwc2_hsotg *hsotg)
-{
- u32 gintsts, gintmsk;
-
- if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) {
- gintmsk = dwc2_readl(hsotg, GINTMSK);
- gintmsk &= ~GINTSTS_CONIDSTSCHNG;
- dwc2_writel(hsotg, gintmsk, GINTMSK);
- gintsts = dwc2_readl(hsotg, GINTSTS);
- dwc2_writel(hsotg, gintsts | GINTSTS_CONIDSTSCHNG, GINTSTS);
- }
-}
-
-void dwc2_drd_resume(struct dwc2_hsotg *hsotg)
-{
- u32 gintsts, gintmsk;
-
- if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) {
- gintsts = dwc2_readl(hsotg, GINTSTS);
- dwc2_writel(hsotg, gintsts | GINTSTS_CONIDSTSCHNG, GINTSTS);
- gintmsk = dwc2_readl(hsotg, GINTMSK);
- gintmsk |= GINTSTS_CONIDSTSCHNG;
- dwc2_writel(hsotg, gintmsk, GINTMSK);
- }
-}
-
-void dwc2_drd_exit(struct dwc2_hsotg *hsotg)
-{
- if (hsotg->role_sw)
- usb_role_switch_unregister(hsotg->role_sw);
-}
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