156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2010 coresystems GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <libpayload.h>
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#include "ehci.h"
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#include "ehci_private.h"
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typedef struct {
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int n_ports;
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/* typical C, n_ports is the number
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* of ports, while ports[] spans [0,n_ports-1],
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* even though the spec counts from 1.
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*/
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volatile portsc_t *ports;
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int *devices;
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} rh_inst_t;
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#define RH_INST(dev) ((rh_inst_t*)(dev)->data)
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static void
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ehci_rh_destroy (usbdev_t *dev)
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{
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free (RH_INST(dev)->devices);
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free (RH_INST(dev));
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}
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static void
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ehci_rh_hand_over_port (usbdev_t *dev, int port)
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{
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volatile portsc_t *p = &(RH_INST(dev)->ports[port]);
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debug("giving up port %x, it's USB1\n", port+1);
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/* Lowspeed device. Hand over to companion */
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*p |= P_PORT_OWNER;
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do {} while (!(*p & P_CONN_STATUS_CHANGE));
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/* RW/C register, so clear it by writing 1 */
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*p |= P_CONN_STATUS_CHANGE;
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return;
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}
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static void
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ehci_rh_scanport (usbdev_t *dev, int port)
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{
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volatile portsc_t *p = &(RH_INST(dev)->ports[port]);
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if (RH_INST(dev)->devices[port]!=-1) {
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debug("Unregister device at port %x\n", port+1);
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usb_detach_device(dev->controller, RH_INST(dev)->devices[port]);
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RH_INST(dev)->devices[port]=-1;
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}
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/* device connected, handle */
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if (*p & P_CURR_CONN_STATUS) {
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mdelay(100);
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if ((*p & P_LINE_STATUS) == P_LINE_STATUS_LOWSPEED) {
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ehci_rh_hand_over_port(dev, port);
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return;
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}
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/* Deassert enable, assert reset. These must change
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* atomically.
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*/
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*p = (*p & ~P_PORT_ENABLE) | P_PORT_RESET;
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/* Wait a bit while reset is active. */
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mdelay(50);
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/* Deassert reset. */
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*p &= ~P_PORT_RESET;
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/* Wait for flag change to finish. The controller might take a while */
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while (*p & P_PORT_RESET) ;
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if (!(*p & P_PORT_ENABLE)) {
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ehci_rh_hand_over_port(dev, port);
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return;
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}
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debug("port %x hosts a USB2 device\n", port+1);
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RH_INST(dev)->devices[port] = usb_attach_device(dev->controller, dev->address, port, 2);
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}
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/* RW/C register, so clear it by writing 1 */
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*p |= P_CONN_STATUS_CHANGE;
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}
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static int
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ehci_rh_report_port_changes (usbdev_t *dev)
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{
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int i;
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for (i=0; i<RH_INST(dev)->n_ports; i++) {
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if (RH_INST(dev)->ports[i] & P_CONN_STATUS_CHANGE)
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return i;
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}
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return -1;
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}
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static void
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ehci_rh_poll (usbdev_t *dev)
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{
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int port;
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while ((port = ehci_rh_report_port_changes (dev)) != -1)
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ehci_rh_scanport (dev, port);
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}
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void
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ehci_rh_init (usbdev_t *dev)
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{
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int i;
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volatile portsc_t *p;
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dev->destroy = ehci_rh_destroy;
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dev->poll = ehci_rh_poll;
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dev->data = malloc(sizeof(rh_inst_t));
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RH_INST(dev)->n_ports = EHCI_INST(dev->controller)->capabilities->hcsparams & HCS_NPORTS_MASK;
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RH_INST(dev)->ports = EHCI_INST(dev->controller)->operation->portsc;
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debug("root hub has %x ports\n", RH_INST(dev)->n_ports);
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RH_INST(dev)->devices = malloc(RH_INST(dev)->n_ports * sizeof(int));
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for (i=0; i < RH_INST(dev)->n_ports; i++) {
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p = &(RH_INST(dev)->ports[i]);
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RH_INST(dev)->devices[i] = -1;
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*p |= P_PP;
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}
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dev->address = 0;
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dev->hub = -1;
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dev->port = -1;
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}
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