USB: xhci: Root hub support.

Add functionality for getting port status and hub descriptor for xHCI root
hubs.  This is WIP because the USB 3.0 hub descriptor is different from
the USB 2.0 hub descriptor.  For now, we lie about the root hub descriptor
because the changes won't effect how the core talks to the root hub.
Later we will need to add the USB 3.0 hub descriptor for real hubs, and
this code might change.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c
index 6dbf7d856f80..570cd4820458 100644
--- a/drivers/usb/host/xhci-dbg.c
+++ b/drivers/usb/host/xhci-dbg.c
@@ -152,6 +152,31 @@ void xhci_print_op_regs(struct xhci_hcd *xhci)
         xhci_print_status(xhci);
 }
 
+void xhci_print_ports(struct xhci_hcd *xhci)
+{
+        u32 __iomem *addr;
+        int i, j;
+        int ports;
+        char *names[NUM_PORT_REGS] = {
+                "status",
+                "power",
+                "link",
+                "reserved",
+        };
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+        addr = &xhci->op_regs->port_status_base;
+        for (i = 0; i < ports; i++) {
+                for (j = 0; j < NUM_PORT_REGS; ++j) {
+                        xhci_dbg(xhci, "0x%x port %s reg = 0x%x\n",
+                                        (unsigned int) addr,
+                                        names[j],
+                                        (unsigned int) xhci_readl(xhci, addr));
+                        addr++;
+                }
+        }
+}
+
 void xhci_print_ir_set(struct xhci_hcd *xhci, struct intr_reg *ir_set, int set_num)
 {
         void *addr;
@@ -228,6 +253,7 @@ void xhci_print_registers(struct xhci_hcd *xhci)
 {
         xhci_print_cap_regs(xhci);
         xhci_print_op_regs(xhci);
+        xhci_print_ports(xhci);
 }
 
 void xhci_print_trb_offsets(struct xhci_hcd *xhci, union xhci_trb *trb)