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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008-2010 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.
*/
//#define USB_DEBUG
#include <libpayload.h>
#include "uhci.h"
#include "uhci_private.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 if (port == 2)
port = PORTSC2;
else {
usb_debug("Invalid port %d\n", port);
return;
}
uhci_reg_write16(controller, port,
uhci_reg_read16(controller, port) & ~(1 << 12)); /* wakeup */
uhci_reg_write16(controller, port,
uhci_reg_read16(controller, port) | 1 << 9); /* reset */
mdelay (30); // >10ms
uhci_reg_write16(controller, port,
uhci_reg_read16(controller, port) & ~(1 << 9));
mdelay (1); // >5.3us per spec, <3ms because some devices make trouble
uhci_reg_write16(controller, port,
uhci_reg_read16(controller, port) | 1 << 2); /* enable */
/* wait for controller to enable port */
/* TOTEST: how long to wait? 100ms for now */
int timeout = 200; /* time out after 200 * 500us == 100ms */
do {
value = uhci_reg_read16 (controller, port);
udelay(500); timeout--;
} while (((value & (1 << 2)) == 0) && (value & 0x01) && timeout);
if (!timeout)
usb_debug("Warning: uhci_rh: port enabling timed out.\n");
}
/* disable root hub */
static void
uhci_rh_disable_port (usbdev_t *dev, int port)
{
hci_t *controller = dev->controller;
if (port == 1)
port = PORTSC1;
else if (port == 2)
port = PORTSC2;
else {
usb_debug("Invalid port %d\n", port);
return;
}
uhci_reg_write16(controller, port,
uhci_reg_read16(controller, port) & ~4);
u16 value;
/* wait for controller to disable port */
/* TOTEST: how long to wait? 100ms for now */
int timeout = 200; /* time out after 200 * 500us == 100ms */
do {
value = uhci_reg_read16 (controller, port);
udelay(500); timeout--;
} while (((value & (1 << 2)) != 0) && timeout);
if (!timeout)
usb_debug("Warning: uhci_rh: port disabling timed out.\n");
}
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 {
usb_debug("Invalid port %d\n", port);
return;
}
int devno = RH_INST (dev)->port[offset];
if ((devno != -1) && (dev->controller->devices[devno] != 0)) {
usb_detach_device(dev->controller, devno);
RH_INST (dev)->port[offset] = -1;
}
uhci_reg_write16(dev->controller, portsc,
uhci_reg_read16(dev->controller, portsc) | (1 << 3) | (1 << 2)); // clear port state change, enable port
mdelay(100); // wait for signal to stabilize
if ((uhci_reg_read16 (dev->controller, portsc) & 1) != 0) {
// device attached
uhci_rh_disable_port (dev, port);
uhci_rh_enable_port (dev, port);
usb_speed speed = ((uhci_reg_read16 (dev->controller, portsc) >> 8) & 1);
RH_INST (dev)->port[offset] = usb_attach_device(dev->controller, dev->address, portsc, speed);
}
}
static int
uhci_rh_report_port_changes (usbdev_t *dev)
{
u16 stored, real;
stored = (RH_INST (dev)->port[0] == -1);
real = ((uhci_reg_read16 (dev->controller, PORTSC1) & 1) == 0);
if (stored != real) {
usb_debug("change on port 1\n");
return 1;
}
stored = (RH_INST (dev)->port[1] == -1);
real = ((uhci_reg_read16 (dev->controller, PORTSC2) & 1) == 0);
if (stored != real) {
usb_debug("change on port 2\n");
return 2;
}
// maybe detach+attach happened between two scans?
if ((uhci_reg_read16 (dev->controller, PORTSC1) & 2) > 0) {
usb_debug("possibly re-attached on port 1\n");
return 1;
}
if ((uhci_reg_read16 (dev->controller, PORTSC2) & 2) > 0) {
usb_debug("possibly re-attached on port 2\n");
return 2;
}
// no change
return -1;
}
static void
uhci_rh_destroy (usbdev_t *dev)
{
usb_detach_device (dev->controller, 1);
usb_detach_device (dev->controller, 2);
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 = xmalloc (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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