diff options
Diffstat (limited to 'payloads/libpayload/drivers/usb/usbhub.c')
| -rw-r--r-- | payloads/libpayload/drivers/usb/usbhub.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/usbhub.c b/payloads/libpayload/drivers/usb/usbhub.c new file mode 100644 index 0000000000..04c04c383a --- /dev/null +++ b/payloads/libpayload/drivers/usb/usbhub.c @@ -0,0 +1,158 @@ +/* + * This file is part of the libpayload project. + * + * Copyright (C) 2008 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.h" + +// assume that host_to_device is overwritten if necessary +#define DR_PORT gen_bmRequestType(host_to_device, class_type, other_recp) +#define PORT_RESET 0x4 +#define PORT_POWER 0x8 + +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) +{ + 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 newdev; + unsigned short buf[2]; + usbdev_t *newdev_t; + + get_status (dev, port, DR_PORT, 4, buf); + int portstatus = ((buf[0] & 1) == 0); + int datastatus = (HUB_INST (dev)->ports[port] == -1); + if (portstatus == datastatus) + return; // no change - FIXME: read right fields for that test + + if (!datastatus) { + int devno = HUB_INST (dev)->ports[port]; + if (devno == -1) + fatal ("FATAL: illegal devno!\n"); + dev->controller->devices[devno].destroy (&dev->controller-> + devices[devno]); + init_device_entry (dev->controller, devno); + HUB_INST (dev)->ports[port] = -1; + return; + } + + set_feature (dev, port, PORT_RESET, DR_PORT); + mdelay (20); + + get_status (dev, port, DR_PORT, 4, buf); + int lowspeed = (buf[0] >> 9) & 1; + + newdev = set_address (dev->controller, lowspeed); + if (newdev == -1) + return; + newdev_t = &dev->controller->devices[newdev]; + + HUB_INST (dev)->ports[port] = newdev; + newdev_t->address = newdev; + newdev_t->hub = dev->address; + newdev_t->port = port; + // determine responsible driver + newdev_t->init (newdev_t); +} + +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); + // FIXME: proper change detection + int portstatus = ((buf[0] & 1) == 0); + int datastatus = (HUB_INST (dev)->ports[port] == -1); + if (portstatus != datastatus) + return port; + } + +// no change + return -1; +} + +static void +usb_hub_enable_port (usbdev_t *dev, int port) +{ + set_feature (dev, port, 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)); + + 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)); + 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); +} |