Changeset e6b0dba in mainline

Timestamp:

2017-09-30T13:07:10Z (7 years ago)

Author:

jenda@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c9d905f

Parents:

cc9ac7c

Message:

BIOS handover

File:

• uspace/drv/bus/usb/xhci/hc.c (modified) (1 diff)

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

@@ -323 +323 @@
                 return EOK;
 
-        /*
-         * TODO: Implement handoff from BIOS, section 4.22.1
-         * QEMU does not support this, so we have to test on real HW.
-         */
+        /* Section 4.22.1 */
+        /* TODO: Test this with USB3-aware BIOS */
+        usb_log_debug2("LEGSUP: bios: %x, os: %x", hc->legsup->sem_bios, hc->legsup->sem_os);
+        XHCI_REG_WR(hc->legsup, XHCI_LEGSUP_SEM_OS, 1);
+        for (int i = 0; i<1001; i++) {
+                usb_log_debug2("LEGSUP: elapsed: %i ms, bios: %x, os: %x", i,
+                        XHCI_REG_RD(hc->legsup, XHCI_LEGSUP_SEM_BIOS),
+                        XHCI_REG_RD(hc->legsup, XHCI_LEGSUP_SEM_OS));
+                if (XHCI_REG_RD(hc->legsup, XHCI_LEGSUP_SEM_BIOS) == 0) {
+                        assert(XHCI_REG_RD(hc->legsup, XHCI_LEGSUP_SEM_OS) == 1);
+                        return EOK;
+                }
+                async_usleep(1000);
+        }
+        usb_log_error("BIOS did not release XHCI legacy hold!\n");
+
         return ENOTSUP;
 }