X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdevices%2Fusb_ehci.c;fp=src%2Fdevices%2Fusb_ehci.c;h=34f328b97c8cc6cfa46880f6ead0ea2d3913ba85;hb=b4e9c266d656c6b595cc57920a34937776acc300;hp=0000000000000000000000000000000000000000;hpb=6ffbc2b68c34c2d1e42d5f6bcd8f2b94b82d05d7;p=pintos-anon

diff --git a/src/devices/usb_ehci.c b/src/devices/usb_ehci.c
new file mode 100644
index 0000000..34f328b
--- /dev/null
+++ b/src/devices/usb_ehci.c
@@ -0,0 +1,52 @@
+/**
+ *
+ * Actual EHCI will be implemented later
+ *
+ * For now, we just deactivate the EHCI controller and routing circuitry
+ * so that any USB2.0 devices activated by the BIOS will show up on the 
+ * USB1.1 controllers instead of being routed to EHCI and therefore "invisible"
+ * to the system.
+ *
+ */
+
+#include "devices/pci.h"
+#include "devices/usb.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+/* capability registers */
+#define EHCI_REG_CAPLENGTH	0x00
+
+/* operational regisers - must be offset by op_base */
+#define EHCI_REG_CONFIGFLAG	0x40
+
+void ehci_init (void);
+
+
+void
+ehci_init (void)
+{
+  struct pci_dev *pd;
+  int dev_num;
+
+  dev_num = 0;
+  while ((pd = pci_get_dev_by_class (PCI_MAJOR_SERIALBUS, PCI_MINOR_USB,
+				     PCI_USB_IFACE_EHCI, dev_num)) != NULL)
+    {
+      struct pci_io *io;
+      uint8_t op_base;
+
+      dev_num++;
+      io = pci_io_enum (pd, NULL);
+      if (io == NULL)
+	{
+	  printf ("IO not found on EHCI device?\n");
+	  continue;
+	}
+      printf ("Disabling the EHCI controller #%d\n", dev_num - 1);
+      op_base = pci_reg_read8 (io, EHCI_REG_CAPLENGTH);
+
+      /* turn off EHCI routing */
+      pci_reg_write32 (io, EHCI_REG_CONFIGFLAG + op_base, 0);
+    }
+}