Changeset 0e7380f in mainline for uspace/drv/bus/usb/xhci/hw_struct/common.h

Timestamp:

2018-01-13T00:18:28Z (6 years ago)

Author:

Ondřej Hlavatý <aearsis@…>

Branches:

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

Children:

94e9c29

Parents:

fb154e13

Message:

xhci: wait for conditions to hold in a systematic way

File:

• uspace/drv/bus/usb/xhci/hw_struct/common.h (modified) (2 diffs)

uspace/drv/bus/usb/xhci/hw_struct/common.h

@@ -42 +42 @@
 #include <assert.h>
 #include <bitops.h>
+#include <byteorder.h>
 #include <ddi.h>
-#include <byteorder.h>
+#include <errno.h>
 
 #define host2xhci(size, val) host2uint##size##_t_le((val))
@@ -88 +89 @@
 }
 
+static inline int xhci_reg_wait(xhci_dword_t *reg, uint32_t mask, uint32_t expected)
+{
+        mask = host2xhci(32, mask);
+        expected = host2xhci(32, expected);
+
+        unsigned retries = 100;
+        uint32_t value = *reg & mask;
+
+        for (; retries > 0 && value != expected; --retries) {
+                async_usleep(10000);
+                value = *reg & mask;
+        }
+
+        return value == expected ? EOK : ETIMEOUT;
+}
+
 #endif