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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 coresystems GmbH
*
* 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.
*/
#include <libpayload.h>
#include "uhci.h"
typedef struct {
int port[2];
} rh_inst_t;
#define RH_INST(dev) ((rh_inst_t*)(dev)->data)
static void
uhci_rh_enable_port (usbdev_t *dev, int port)
{
u16 value;
hci_t *controller = dev->controller;
if (port == 1)
port = PORTSC1;
else
port = PORTSC2;
uhci_reg_mask16 (controller, port, ~(1 << 12), 0); /* wakeup */
uhci_reg_mask16 (controller, port, ~0, 1 << 9); /* reset */
mdelay (30); // >10ms
uhci_reg_mask16 (controller, port, ~(1 << 9), 0);
mdelay (1); // >5.3us per spec, <3ms because some devices make trouble
uhci_reg_mask16 (controller, port, ~0, 1 << 2); /* enable */
do {
value = uhci_reg_read16 (controller, port);
mdelay (1);
} while (((value & (1 << 2)) == 0) && (value & 0x01));
}
/* disable root hub */
static void
uhci_rh_disable_port (usbdev_t *dev, int port)
{
hci_t *controller = dev->controller;
port = PORTSC2;
if (port == 1)
port = PORTSC1;
uhci_reg_mask16 (controller, port, ~4, 0);
int value;
do {
value = uhci_reg_read16 (controller, port);
mdelay (1);
} while ((value & (1 << 2)) != 0);
}
static void
uhci_rh_scanport (usbdev_t *dev, int port)
{
int portsc, offset;
if (port == 1) {
portsc = PORTSC1;
offset = 0;
} else if (port == 2) {
portsc = PORTSC2;
offset = 1;
} else
return;
int devno = RH_INST (dev)->port[offset];
if (devno != -1) {
dev->controller->devices[devno].destroy (&dev->controller->
devices[devno]);
init_device_entry (dev->controller, devno);
RH_INST (dev)->port[offset] = -1;
}
uhci_reg_mask16 (dev->controller, portsc, ~0, (1 << 3) | (1 << 2)); // clear port state change, enable port
if ((uhci_reg_read16 (dev->controller, portsc) & 1) != 0) {
int newdev;
usbdev_t *newdev_t;
// device attached
uhci_rh_disable_port (dev, port);
uhci_rh_enable_port (dev, port);
int lowspeed =
(uhci_reg_read16 (dev->controller, portsc) >> 8) & 1;
printf ("%sspeed device\n", (lowspeed == 1) ? "low" : "full");
newdev = set_address (dev->controller, lowspeed);
if (newdev == -1)
return;
newdev_t = &dev->controller->devices[newdev];
RH_INST (dev)->port[offset] = newdev;
newdev_t->address = newdev;
newdev_t->hub = dev->address;
newdev_t->port = portsc;
// determine responsible driver
newdev_t->init (newdev_t);
}
}
static int
uhci_rh_report_port_changes (usbdev_t *dev)
{
int stored, real;
stored = (RH_INST (dev)->port[0] == -1);
real = ((uhci_reg_read16 (dev->controller, PORTSC1) & 1) == 0);
if (stored != real)
return 1;
stored = (RH_INST (dev)->port[1] == -1);
real = ((uhci_reg_read16 (dev->controller, PORTSC2) & 1) == 0);
if (stored != real)
return 2;
// maybe detach+attach happened between two scans?
if ((uhci_reg_read16 (dev->controller, PORTSC1) & 2) > 0)
return 1;
if ((uhci_reg_read16 (dev->controller, PORTSC2) & 2) > 0)
return 2;
// no change
return -1;
}
static void
uhci_rh_destroy (usbdev_t *dev)
{
uhci_rh_disable_port (dev, 1);
uhci_rh_disable_port (dev, 2);
free (RH_INST (dev));
}
static void
uhci_rh_poll (usbdev_t *dev)
{
int port;
while ((port = uhci_rh_report_port_changes (dev)) != -1)
uhci_rh_scanport (dev, port);
}
void
uhci_rh_init (usbdev_t *dev)
{
dev->destroy = uhci_rh_destroy;
dev->poll = uhci_rh_poll;
uhci_rh_enable_port (dev, 1);
uhci_rh_enable_port (dev, 2);
dev->data = malloc (sizeof (rh_inst_t));
RH_INST (dev)->port[0] = -1;
RH_INST (dev)->port[1] = -1;
/* we can set them here because a root hub _really_ shouldn't
appear elsewhere */
dev->address = 0;
dev->hub = -1;
dev->port = -1;
}
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