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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.
*/
#include <usb/usb.h>
// assume that host_to_device is overwritten if necessary
#define DR_PORT gen_bmRequestType(host_to_device, class_type, other_recp)
/* status bits */
#define PORT_CONNECTION 0x1
#define PORT_ENABLE 0x2
#define PORT_RESET 0x10
/* status change bits */
#define C_PORT_CONNECTION 0x1
/* feature selectors (for setting / clearing features) */
#define SEL_PORT_RESET 0x4
#define SEL_PORT_POWER 0x8
#define SEL_C_PORT_CONNECTION 0x10
typedef struct {
int num_ports;
int *ports;
hub_descriptor_t *descriptor;
} usbhub_inst_t;
#define HUB_INST(dev) ((usbhub_inst_t*)(dev)->data)
static void
usb_hub_destroy (usbdev_t *dev)
{
int i;
/* First, detach all devices behind this hub. */
int *const ports = HUB_INST (dev)->ports;
for (i = 1; i <= HUB_INST (dev)->num_ports; i++) {
if (ports[i] != -1) {
usb_detach_device(dev->controller, ports[i]);
ports[i] = -1;
}
}
free (HUB_INST (dev)->ports);
free (HUB_INST (dev)->descriptor);
free (HUB_INST (dev));
}
static void
usb_hub_scanport (usbdev_t *dev, int port)
{
int timeout;
unsigned short buf[2];
get_status (dev, port, DR_PORT, 4, buf);
if (!(buf[1] & C_PORT_CONNECTION))
/* no change */
return;
/* clear Port Connection status change */
clear_feature (dev, port, SEL_C_PORT_CONNECTION, DR_PORT);
int devno = HUB_INST (dev)->ports[port];
if (devno != -1) {
/* detach device, either because of re-/ or disconnect */
usb_detach_device(dev->controller, devno);
HUB_INST (dev)->ports[port] = -1;
}
if (!(buf[0] & PORT_CONNECTION))
/* no device connected, nothing to do */
return;
/* wait 100ms for port to become stable */
mdelay (100); // usb20 spec 9.1.2
/* reset port */
set_feature (dev, port, SEL_PORT_RESET, DR_PORT);
/* wait at least 10ms (usb2.0 spec 11.5.1.5: 10ms to 20ms) */
mdelay (10);
/* wait for hub to finish reset */
timeout = 30; /* time out after 10ms (spec) + 20ms (kindly) */
do {
get_status (dev, port, DR_PORT, 4, buf);
mdelay(1); timeout--;
} while ((buf[0] & PORT_RESET) && timeout);
if (!timeout)
usb_debug("Warning: usbhub: port reset timed out.\n");
/* wait for port to be enabled. the hub is responsible for this */
timeout = 500; /* time out after 500ms */
do {
get_status (dev, port, DR_PORT, 4, buf);
mdelay(1); timeout--;
} while (!(buf[0] & PORT_ENABLE) && timeout);
if (!timeout)
usb_debug("Warning: usbhub: port enabling timed out.\n");
get_status (dev, port, DR_PORT, 4, buf);
/* bit 10 9
* 0 0 full speed
* 0 1 low speed
* 1 0 high speed
*/
int speed = ((buf[0] >> 9) & 3) ;
HUB_INST (dev)->ports[port] = usb_attach_device(dev->controller, dev->address, port, speed);
/* clear Port Connection status change */
clear_feature (dev, port, SEL_C_PORT_CONNECTION, DR_PORT);
}
static int
usb_hub_report_port_changes (usbdev_t *dev)
{
int port;
unsigned short buf[2];
for (port = 1; port <= HUB_INST (dev)->num_ports; port++) {
get_status (dev, port, DR_PORT, 4, buf);
if (buf[1] & C_PORT_CONNECTION)
return port;
}
// no change
return -1;
}
static void
usb_hub_enable_port (usbdev_t *dev, int port)
{
set_feature (dev, port, SEL_PORT_POWER, DR_PORT);
mdelay (20);
}
#if 0
static void
usb_hub_disable_port (usbdev_t *dev, int port)
{
}
#endif
static void
usb_hub_poll (usbdev_t *dev)
{
int port;
while ((port = usb_hub_report_port_changes (dev)) != -1)
usb_hub_scanport (dev, port);
}
void
usb_hub_init (usbdev_t *dev)
{
int i;
dev->destroy = usb_hub_destroy;
dev->poll = usb_hub_poll;
dev->data = malloc (sizeof (usbhub_inst_t));
if (!dev->data)
fatal("Not enough memory for USB hub.\n");
HUB_INST (dev)->descriptor = (hub_descriptor_t *) get_descriptor(dev,
gen_bmRequestType(device_to_host, class_type, dev_recp), 0x29, 0, 0);
HUB_INST (dev)->num_ports = HUB_INST (dev)->descriptor->bNbrPorts;
HUB_INST (dev)->ports =
malloc (sizeof (int) * (HUB_INST (dev)->num_ports + 1));
if (! HUB_INST (dev)->ports)
fatal("Not enough memory for USB hub ports.\n");
for (i = 1; i <= HUB_INST (dev)->num_ports; i++)
HUB_INST (dev)->ports[i] = -1;
for (i = 1; i <= HUB_INST (dev)->num_ports; i++)
usb_hub_enable_port (dev, i);
}
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