diff --git a/tests/Makefile b/tests/Makefile
index e4ddb6a..8858407 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -320,7 +320,7 @@ tests/tmp105-test$(EXESUF): tests/tmp105-test.o $(libqos-omap-obj-y)
 tests/i440fx-test$(EXESUF): tests/i440fx-test.o $(libqos-pc-obj-y)
 tests/fw_cfg-test$(EXESUF): tests/fw_cfg-test.o $(libqos-pc-obj-y)
 tests/e1000-test$(EXESUF): tests/e1000-test.o
-tests/rtl8139-test$(EXESUF): tests/rtl8139-test.o
+tests/rtl8139-test$(EXESUF): tests/rtl8139-test.o $(libqos-pc-obj-y)
 tests/pcnet-test$(EXESUF): tests/pcnet-test.o
 tests/eepro100-test$(EXESUF): tests/eepro100-test.o
 tests/vmxnet3-test$(EXESUF): tests/vmxnet3-test.o
diff --git a/tests/rtl8139-test.c b/tests/rtl8139-test.c
index f6a1be3..f0044bb 100644
--- a/tests/rtl8139-test.c
+++ b/tests/rtl8139-test.c
@@ -10,19 +10,199 @@
 #include <glib.h>
 #include <string.h>
 #include "libqtest.h"
+#include "libqos/pci-pc.h"
 #include "qemu/osdep.h"
+#include "qemu-common.h"
 
 /* Tests only initialization so far. TODO: Replace with functional tests */
 static void nop(void)
 {
 }
 
+#define CLK 33000000
+#define NS_PER_SEC 1000000000ULL
+
+static QPCIBus *pcibus;
+static QPCIDevice *dev;
+static void *dev_base;
+
+static void save_fn(QPCIDevice *dev, int devfn, void *data)
+{
+    QPCIDevice **pdev = (QPCIDevice **) data;
+
+    *pdev = dev;
+}
+
+static QPCIDevice *get_device(void)
+{
+    QPCIDevice *dev;
+
+    pcibus = qpci_init_pc();
+    qpci_device_foreach(pcibus, 0x10ec, 0x8139, save_fn, &dev);
+    g_assert(dev != NULL);
+
+    return dev;
+}
+
+#define PORT(name, len, val) \
+static unsigned __attribute__((unused)) in_##name(void) \
+{ \
+    unsigned res = qpci_io_read##len(dev, dev_base+(val)); \
+    g_test_message("*%s -> %x\n", #name, res); \
+    return res; \
+} \
+static void out_##name(unsigned v) \
+{ \
+    g_test_message("%x -> *%s\n", v, #name); \
+    qpci_io_write##len(dev, dev_base+(val), v); \
+}
+
+PORT(Timer, l, 0x48)
+PORT(IntrMask, w, 0x3c)
+PORT(IntrStatus, w, 0x3E)
+PORT(TimerInt, l, 0x54)
+
+#define fatal(...) do { g_test_message(__VA_ARGS__); g_assert(0); } while (0)
+
+static void test_timer(void)
+{
+    const unsigned from = 0.95 * CLK;
+    const unsigned to = 1.6 * CLK;
+
+    out_IntrMask(0);
+
+    in_IntrStatus();
+    in_Timer();
+    in_Timer();
+
+    /* Test 1. test counter continue and continue */
+    out_TimerInt(0); /* disable timer */
+    out_IntrStatus(0x4000);
+    out_Timer(12345); /* reset timer to 0 */
+    unsigned curr = in_Timer();
+    unsigned cnt;
+    if (curr > 0.1 * CLK) {
+        fatal("time too big %u\n", curr);
+    }
+    for (cnt = 0; ; ) {
+        clock_step(1 * NS_PER_SEC);
+        unsigned prev = curr;
+        curr = in_Timer();
+
+        /* test skip is in a specific range */
+        unsigned diff = (curr-prev) & 0xffffffffu;
+        if (diff < from || diff > to) {
+            fatal("Invalid diff %u (%u-%u)\n", diff, from, to);
+        }
+        if (curr < prev && ++cnt == 3) {
+            break;
+        }
+    }
+
+    /* Test 2. Check we didn't get an interrupt with TimerInt == 0 */
+    if (in_IntrStatus() & 0x4000) {
+        fatal("got an interrupt\n");
+    }
+
+    /* Test 3. Setting TimerInt to 1 and Timer to 0 get interrupt */
+    out_TimerInt(1);
+    out_Timer(0);
+    clock_step(40);
+    if ((in_IntrStatus() & 0x4000) == 0) {
+        fatal("we should have an interrupt here!\n");
+    }
+
+    /* Test 3. Check acknowledge */
+    out_IntrStatus(0x4000);
+    if (in_IntrStatus() & 0x4000) {
+        fatal("got an interrupt\n");
+    }
+
+    /* Test. Status set after Timer reset */
+    out_Timer(0);
+    out_TimerInt(0);
+    out_IntrStatus(0x4000);
+    curr = in_Timer();
+    out_TimerInt(curr + 0.5 * CLK);
+    clock_step(1 * NS_PER_SEC);
+    out_Timer(0);
+    if ((in_IntrStatus() & 0x4000) == 0) {
+        fatal("we should have an interrupt here!\n");
+    }
+
+    /* Test. Status set after TimerInt reset */
+    out_Timer(0);
+    out_TimerInt(0);
+    out_IntrStatus(0x4000);
+    curr = in_Timer();
+    out_TimerInt(curr + 0.5 * CLK);
+    clock_step(1 * NS_PER_SEC);
+    out_TimerInt(0);
+    if ((in_IntrStatus() & 0x4000) == 0) {
+        fatal("we should have an interrupt here!\n");
+    }
+
+    /* Test 4. Increment TimerInt we should see an interrupt */
+    curr = in_Timer();
+    unsigned next = curr + 5.0 * CLK;
+    out_TimerInt(next);
+    for (cnt = 0; ; ) {
+        clock_step(1 * NS_PER_SEC);
+        unsigned prev = curr;
+        curr = in_Timer();
+        unsigned diff = (curr-prev) & 0xffffffffu;
+        if (diff < from || diff > to) {
+            fatal("Invalid diff %u (%u-%u)\n", diff, from, to);
+        }
+        if (cnt < 3 && curr > next) {
+            if ((in_IntrStatus() & 0x4000) == 0) {
+                fatal("we should have an interrupt here!\n");
+            }
+            out_IntrStatus(0x4000);
+            next = curr + 5.0 * CLK;
+            out_TimerInt(next);
+            if (++cnt == 3) {
+                out_TimerInt(1);
+            }
+        /* Test 5. Second time we pass from 0 should see an interrupt */
+        } else if (cnt >= 3 && curr < prev) {
+            /* here we should have an interrupt */
+            if ((in_IntrStatus() & 0x4000) == 0) {
+                fatal("we should have an interrupt here!\n");
+            }
+            out_IntrStatus(0x4000);
+            if (++cnt == 5) {
+                break;
+            }
+        }
+    }
+
+    g_test_message("Everythink is ok!\n");
+}
+
+
+static void test_init(void)
+{
+    uint64_t barsize;
+
+    dev = get_device();
+
+    dev_base = qpci_iomap(dev, 0, &barsize);
+
+    g_assert(dev_base != NULL);
+
+    qpci_device_enable(dev);
+
+    test_timer();
+}
+
 int main(int argc, char **argv)
 {
     int ret;
 
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/rtl8139/nop", nop);
+    qtest_add_func("/rtl8139/timer", test_init);
 
     qtest_start("-device rtl8139");
     ret = g_test_run();
