coreboot-kgpe-d16/payloads/libpayload/drivers/usb/ehci_rh.c

156 lines
4.4 KiB
C

/*
* 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)
{
volatile portsc_t *p = &(RH_INST(dev)->ports[port]);
debug("giving up port %x, it's USB1\n", port+1);
/* Lowspeed device. Hand over to companion */
*p |= P_PORT_OWNER;
do {} while (!(*p & P_CONN_STATUS_CHANGE));
/* RW/C register, so clear it by writing 1 */
*p |= P_CONN_STATUS_CHANGE;
return;
}
static void
ehci_rh_scanport (usbdev_t *dev, int port)
{
volatile portsc_t *p = &(RH_INST(dev)->ports[port]);
if (RH_INST(dev)->devices[port]!=-1) {
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 (*p & P_CURR_CONN_STATUS) {
mdelay(100);
if ((*p & P_LINE_STATUS) == P_LINE_STATUS_LOWSPEED) {
ehci_rh_hand_over_port(dev, port);
return;
}
/* Deassert enable, assert reset. These must change
* atomically.
*/
*p = (*p & ~P_PORT_ENABLE) | P_PORT_RESET;
/* Wait a bit while reset is active. */
mdelay(50);
/* Deassert reset. */
*p &= ~P_PORT_RESET;
/* Wait for flag change to finish. The controller might take a while */
while (*p & P_PORT_RESET) ;
if (!(*p & P_PORT_ENABLE)) {
ehci_rh_hand_over_port(dev, port);
return;
}
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 */
*p |= 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;
volatile portsc_t *p;
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;
debug("root hub has %x ports\n", RH_INST(dev)->n_ports);
RH_INST(dev)->devices = malloc(RH_INST(dev)->n_ports * sizeof(int));
for (i=0; i < RH_INST(dev)->n_ports; i++) {
p = &(RH_INST(dev)->ports[i]);
RH_INST(dev)->devices[i] = -1;
*p |= P_PP;
}
dev->address = 0;
dev->hub = -1;
dev->port = -1;
}