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/*
*
* Copyright (C) 2010 Patrick Georgi
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
//#define USB_DEBUG
#include <libpayload.h>
#include "ohci_private.h"
#include "ohci.h"
typedef struct {
int numports;
int *port;
} rh_inst_t;
#define RH_INST(dev) ((rh_inst_t*)(dev)->data)
static void
ohci_rh_enable_port(usbdev_t *dev, int port)
{
/* Reset RH port should hold 50ms with pulses of at least 10ms and
* gaps of at most 3ms (usb20 spec 7.1.7.5).
* After reset, the port will be enabled automatically (ohci spec
* 7.4.4).
*/
int total_delay = 100; /* 100 * 500us == 50ms */
while (total_delay > 0) {
if (!(OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port]
& CurrentConnectStatus))
return;
/* start reset */
OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] =
SetPortReset;
int timeout = 200; /* timeout after 200 * 500us == 100ms */
while ((OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port]
& PortResetStatus)
&& timeout--) {
udelay(500); total_delay--;
}
if (OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port]
& PortResetStatus) {
usb_debug("Warning: root-hub port reset timed out.\n");
break;
}
if ((200-timeout) < 20)
usb_debug("Warning: port reset too short: %dms; "
"should be at least 10ms.\n",
(200-timeout)/2);
/* clear reset status change */
OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] =
PortResetStatusChange;
usb_debug("rh port reset finished after %dms.\n", (200-timeout)/2);
}
}
/* disable root hub */
static void
ohci_rh_disable_port(usbdev_t *dev, int port)
{
if (RH_INST(dev)->port[port] != -1) {
usb_detach_device(dev->controller, RH_INST(dev)->port[port]);
RH_INST(dev)->port[port] = -1;
}
OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] = ClearPortEnable; // disable port
int timeout = 50; /* timeout after 50 * 100us == 5ms */
while ((OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port]
& PortEnableStatus)
&& timeout--) {
udelay(100);
}
}
static void
ohci_rh_scanport(usbdev_t *dev, int port)
{
if (port >= RH_INST(dev)->numports) {
usb_debug("Invalid port %d\n", port);
return;
}
/* device registered, and device change logged, so something must have happened */
if (RH_INST(dev)->port[port] != -1) {
usb_detach_device(dev->controller, RH_INST(dev)->port[port]);
RH_INST(dev)->port[port] = -1;
}
/* no device attached
previously registered devices are detached, nothing left to do */
if (!(OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & CurrentConnectStatus))
return;
OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] = ConnectStatusChange; // clear port state change
ohci_rh_enable_port(dev, port);
mdelay(100); // wait for signal to stabilize
if (!(OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & PortEnableStatus)) {
usb_debug("port enable failed\n");
return;
}
usb_speed speed = (OHCI_INST(dev->controller)->opreg->HcRhPortStatus[port] & LowSpeedDeviceAttached) != 0;
RH_INST(dev)->port[port] = usb_attach_device(dev->controller, dev->address, port, speed);
}
static int
ohci_rh_report_port_changes(usbdev_t *dev)
{
ohci_t *const ohcic = OHCI_INST(dev->controller);
int i;
for (i = 0; i < RH_INST(dev)->numports; i++) {
// maybe detach+attach happened between two scans?
if (ohcic->opreg->HcRhPortStatus[i] & ConnectStatusChange) {
ohcic->opreg->HcRhPortStatus[i] = ConnectStatusChange;
usb_debug("attachment change on port %d\n", i);
return i;
}
}
// no change
return -1;
}
static void
ohci_rh_destroy(usbdev_t *dev)
{
int i;
for (i = 0; i < RH_INST(dev)->numports; i++)
ohci_rh_disable_port(dev, i);
free(RH_INST(dev));
}
static void
ohci_rh_poll(usbdev_t *dev)
{
ohci_t *const ohcic = OHCI_INST(dev->controller);
int port;
/* Check if anything changed. */
if (!(ohcic->opreg->HcInterruptStatus & RootHubStatusChange))
return;
ohcic->opreg->HcInterruptStatus = RootHubStatusChange;
usb_debug("root hub status change\n");
/* Scan ports with changed connection status. */
while ((port = ohci_rh_report_port_changes(dev)) != -1)
ohci_rh_scanport(dev, port);
}
void
ohci_rh_init(usbdev_t *dev)
{
int i;
dev->destroy = ohci_rh_destroy;
dev->poll = ohci_rh_poll;
dev->data = xmalloc(sizeof(rh_inst_t));
RH_INST(dev)->numports = OHCI_INST(dev->controller)->opreg->HcRhDescriptorA & NumberDownstreamPortsMask;
RH_INST(dev)->port = xmalloc(sizeof(int) * RH_INST(dev)->numports);
usb_debug("%d ports registered\n", RH_INST(dev)->numports);
for (i = 0; i < RH_INST(dev)->numports; i++) {
ohci_rh_enable_port(dev, i);
RH_INST(dev)->port[i] = -1;
}
/* we can set them here because a root hub _really_ shouldn't
appear elsewhere */
dev->address = 0;
dev->hub = -1;
dev->port = -1;
usb_debug("rh init done\n");
}
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