Changeset 9dfb034 in mainline for uspace/drv/bus/usb/ehci/hc.c

Timestamp:

2025-03-04T17:35:28Z (34 hours ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

master

Children:

89b5a75, 94ea2e3

Parents:

77a0119

Message:

Implement quiesce for EHCI and OHCI.

File:

• uspace/drv/bus/usb/ehci/hc.c (modified) (2 diffs)

uspace/drv/bus/usb/ehci/hc.c

@@ -1 +1 @@
 /*
+ * Copyright (c) 2025 Jiri Svoboda
  * Copyright (c) 2011 Jan Vesely
  * Copyright (c) 2018 Ondrej Hlavaty
@@ -212 +213 @@
 }
 
+/** Quiesce host controller
+ *
+ * @param hcd Host controller device
+ */
+int hc_quiesce(hc_device_t *hcd)
+{
+        hc_t *instance = hcd_to_hc(hcd);
+
+        /*
+         * Turn off the HC if it's running, Reseting a running device is
+         * undefined
+         */
+        if (!(EHCI_RD(instance->registers->usbsts) & USB_STS_HC_HALTED_FLAG)) {
+                /* disable all interrupts */
+                EHCI_WR(instance->registers->usbintr, 0);
+                /* ack all interrupts */
+                EHCI_WR(instance->registers->usbsts, 0x3f);
+                /* Stop HC hw */
+                EHCI_WR(instance->registers->usbcmd, 0);
+                /* Wait until hc is halted */
+                while ((EHCI_RD(instance->registers->usbsts) & USB_STS_HC_HALTED_FLAG) == 0) {
+                        fibril_usleep(1);
+                }
+                usb_log_info("HC(%p): EHCI turned off.", instance);
+        } else {
+                usb_log_info("HC(%p): EHCI was not running.", instance);
+        }
+
+        /* Hw initialization sequence, see page 53 (pdf 63) */
+        EHCI_SET(instance->registers->usbcmd, USB_CMD_HC_RESET_FLAG);
+        usb_log_info("HC(%p): Waiting for HW reset.", instance);
+        while (EHCI_RD(instance->registers->usbcmd) & USB_CMD_HC_RESET_FLAG) {
+                fibril_usleep(1);
+        }
+        usb_log_debug("HC(%p): HW reset OK.", instance);
+
+        return EOK;
+}
+
 void hc_enqueue_endpoint(hc_t *instance, const endpoint_t *ep)
 {