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/*
* This file is part of the libpayload project.
*
* Copyright (C) 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 <libpayload.h>
#include "ehci.h"
#include "ehci_private.h"
typedef struct {
int n_ports;
/* typical C, n_ports is the number
* of ports, while ports[] spans [0,n_ports-1],
* even though the spec counts from 1.
*/
volatile portsc_t *ports;
int *devices;
} rh_inst_t;
#define RH_INST(dev) ((rh_inst_t*)(dev)->data)
static void
ehci_rh_destroy (usbdev_t *dev)
{
free (RH_INST(dev)->devices);
free (RH_INST(dev));
}
static void
ehci_rh_hand_over_port (usbdev_t *dev, int port)
{
usb_debug("giving up port %x, it's USB1\n", port+1);
/* Clear ConnectStatusChange before evaluation */
/* RW/C register, so clear it by writing 1 */
RH_INST(dev)->ports[port] |= P_CONN_STATUS_CHANGE;
/* Lowspeed device. Hand over to companion */
RH_INST(dev)->ports[port] |= P_PORT_OWNER;
/* TOTEST: how long to wait? trying 100ms for now */
int timeout = 10; /* timeout after 10 * 10ms == 100ms */
while (!(RH_INST(dev)->ports[port] & P_CONN_STATUS_CHANGE) && timeout--)
mdelay(10);
if (!(RH_INST(dev)->ports[port] & P_CONN_STATUS_CHANGE)) {
usb_debug("Warning: Handing port over to companion timed out.\n");
}
/* RW/C register, so clear it by writing 1 */
RH_INST(dev)->ports[port] |= P_CONN_STATUS_CHANGE;
return;
}
static void
ehci_rh_scanport (usbdev_t *dev, int port)
{
if (RH_INST(dev)->devices[port]!=-1) {
usb_debug("Unregister device at port %x\n", port+1);
usb_detach_device(dev->controller, RH_INST(dev)->devices[port]);
RH_INST(dev)->devices[port]=-1;
}
/* device connected, handle */
if (RH_INST(dev)->ports[port] & P_CURR_CONN_STATUS) {
mdelay(100); // usb20 spec 9.1.2
if ((RH_INST(dev)->ports[port] & P_LINE_STATUS) == P_LINE_STATUS_LOWSPEED) {
ehci_rh_hand_over_port(dev, port);
return;
}
/* Deassert enable, assert reset. These must change
* atomically.
*/
RH_INST(dev)->ports[port] = (RH_INST(dev)->ports[port] & ~P_PORT_ENABLE) | P_PORT_RESET;
/* Wait a bit while reset is active. */
mdelay(50); // usb20 spec 7.1.7.5 (TDRSTR)
/* Deassert reset. */
RH_INST(dev)->ports[port] &= ~P_PORT_RESET;
/* Wait max. 2ms (ehci spec 2.3.9) for flag change to finish. */
int timeout = 20; /* time out after 20 * 100us == 2ms */
while ((RH_INST(dev)->ports[port] & P_PORT_RESET) && timeout--)
udelay(100);
if (RH_INST(dev)->ports[port] & P_PORT_RESET) {
printf("Error: ehci_rh: port reset timed out.\n");
return;
}
/* If the host controller enabled the port, it's a high-speed
* device, otherwise it's full-speed.
*/
if (!(RH_INST(dev)->ports[port] & P_PORT_ENABLE)) {
ehci_rh_hand_over_port(dev, port);
return;
}
usb_debug("port %x hosts a USB2 device\n", port+1);
RH_INST(dev)->devices[port] = usb_attach_device(dev->controller, dev->address, port, 2);
}
/* RW/C register, so clear it by writing 1 */
RH_INST(dev)->ports[port] |= P_CONN_STATUS_CHANGE;
}
static int
ehci_rh_report_port_changes (usbdev_t *dev)
{
int i;
for (i=0; i<RH_INST(dev)->n_ports; i++) {
if (RH_INST(dev)->ports[i] & P_CONN_STATUS_CHANGE)
return i;
}
return -1;
}
static void
ehci_rh_poll (usbdev_t *dev)
{
int port;
while ((port = ehci_rh_report_port_changes (dev)) != -1)
ehci_rh_scanport (dev, port);
}
void
ehci_rh_init (usbdev_t *dev)
{
int i;
dev->destroy = ehci_rh_destroy;
dev->poll = ehci_rh_poll;
dev->data = malloc(sizeof(rh_inst_t));
RH_INST(dev)->n_ports = EHCI_INST(dev->controller)->capabilities->hcsparams & HCS_NPORTS_MASK;
RH_INST(dev)->ports = EHCI_INST(dev->controller)->operation->portsc;
usb_debug("root hub has %x ports\n", RH_INST(dev)->n_ports);
/* If the host controller has port power control, enable power on
* all ports and wait 20ms.
*/
if (EHCI_INST(dev->controller)->capabilities->hcsparams
& HCS_PORT_POWER_CONTROL) {
usb_debug("host controller has port power control, "
"giving power to all ports.\n");
for (i=0; i < RH_INST(dev)->n_ports; i++)
RH_INST(dev)->ports[i] |= P_PP;
}
mdelay(20); // ehci spec 2.3.9
RH_INST(dev)->devices = malloc(RH_INST(dev)->n_ports * sizeof(int));
for (i=0; i < RH_INST(dev)->n_ports; i++) {
RH_INST(dev)->devices[i] = -1;
ehci_rh_scanport(dev, i);
}
dev->address = 0;
dev->hub = -1;
dev->port = -1;
}
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