summaryrefslogtreecommitdiff
path: root/common/usb_hub.c
diff options
context:
space:
mode:
authorMarek Vasut <marek.vasut@gmail.com>2012-02-13 18:58:17 +0000
committerWolfgang Denk <wd@denx.de>2012-03-03 16:55:24 +0100
commit23faf2bc9e80e3ee2c06a3a61bb8a02e43a97097 (patch)
tree853fe944acf4f20055ad86d41f6001a3652c8914 /common/usb_hub.c
parentc08b1b264d9979f4de9838b9082c6e7e7d86fb72 (diff)
downloadu-boot-imx-23faf2bc9e80e3ee2c06a3a61bb8a02e43a97097.zip
u-boot-imx-23faf2bc9e80e3ee2c06a3a61bb8a02e43a97097.tar.gz
u-boot-imx-23faf2bc9e80e3ee2c06a3a61bb8a02e43a97097.tar.bz2
USB: Separate out USB hub driver
Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Cc: Remy Bohmer <linux@bohmer.net> Acked-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'common/usb_hub.c')
-rw-r--r--common/usb_hub.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/common/usb_hub.c b/common/usb_hub.c
new file mode 100644
index 0000000..576e0e6
--- /dev/null
+++ b/common/usb_hub.c
@@ -0,0 +1,476 @@
+/*
+ *
+ * Most of this source has been derived from the Linux USB
+ * project:
+ * (C) Copyright Linus Torvalds 1999
+ * (C) Copyright Johannes Erdfelt 1999-2001
+ * (C) Copyright Andreas Gal 1999
+ * (C) Copyright Gregory P. Smith 1999
+ * (C) Copyright Deti Fliegl 1999 (new USB architecture)
+ * (C) Copyright Randy Dunlap 2000
+ * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
+ * (C) Copyright Yggdrasil Computing, Inc. 2000
+ * (usb_device_id matching changes by Adam J. Richter)
+ *
+ * Adapted for U-Boot:
+ * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/****************************************************************************
+ * HUB "Driver"
+ * Probes device for being a hub and configurate it
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/processor.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+#include <usb.h>
+#ifdef CONFIG_4xx
+#include <asm/4xx_pci.h>
+#endif
+
+#ifdef DEBUG
+#define USB_DEBUG 1
+#define USB_HUB_DEBUG 1
+#else
+#define USB_DEBUG 0
+#define USB_HUB_DEBUG 0
+#endif
+
+#define USB_PRINTF(fmt, args...) debug_cond(USB_DEBUG, fmt, ##args)
+#define USB_HUB_PRINTF(fmt, args...) debug_cond(USB_HUB_DEBUG, fmt, ##args)
+
+#define USB_BUFSIZ 512
+
+static struct usb_hub_device hub_dev[USB_MAX_HUB];
+static int usb_hub_index;
+
+
+static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
+ USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
+}
+
+static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
+ port, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
+static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
+{
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
+ port, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
+static int usb_get_hub_status(struct usb_device *dev, void *data)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
+ data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
+}
+
+static int usb_get_port_status(struct usb_device *dev, int port, void *data)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
+ data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
+}
+
+
+static void usb_hub_power_on(struct usb_hub_device *hub)
+{
+ int i;
+ struct usb_device *dev;
+
+ dev = hub->pusb_dev;
+ /* Enable power to the ports */
+ USB_HUB_PRINTF("enabling power on all ports\n");
+ for (i = 0; i < dev->maxchild; i++) {
+ usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
+ USB_HUB_PRINTF("port %d returns %lX\n", i + 1, dev->status);
+ wait_ms(hub->desc.bPwrOn2PwrGood * 2);
+ }
+}
+
+void usb_hub_reset(void)
+{
+ usb_hub_index = 0;
+}
+
+static struct usb_hub_device *usb_hub_allocate(void)
+{
+ if (usb_hub_index < USB_MAX_HUB)
+ return &hub_dev[usb_hub_index++];
+
+ printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
+ return NULL;
+}
+
+#define MAX_TRIES 5
+
+static inline char *portspeed(int portstatus)
+{
+ if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
+ return "480 Mb/s";
+ else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
+ return "1.5 Mb/s";
+ else
+ return "12 Mb/s";
+}
+
+int hub_port_reset(struct usb_device *dev, int port,
+ unsigned short *portstat)
+{
+ int tries;
+ struct usb_port_status portsts;
+ unsigned short portstatus, portchange;
+
+ USB_HUB_PRINTF("hub_port_reset: resetting port %d...\n", port);
+ for (tries = 0; tries < MAX_TRIES; tries++) {
+
+ usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
+ wait_ms(200);
+
+ if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
+ USB_HUB_PRINTF("get_port_status failed status %lX\n",
+ dev->status);
+ return -1;
+ }
+ portstatus = le16_to_cpu(portsts.wPortStatus);
+ portchange = le16_to_cpu(portsts.wPortChange);
+
+ USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
+ portstatus, portchange,
+ portspeed(portstatus));
+
+ USB_HUB_PRINTF("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
+ " USB_PORT_STAT_ENABLE %d\n",
+ (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
+ (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
+ (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
+
+ if ((portchange & USB_PORT_STAT_C_CONNECTION) ||
+ !(portstatus & USB_PORT_STAT_CONNECTION))
+ return -1;
+
+ if (portstatus & USB_PORT_STAT_ENABLE)
+ break;
+
+ wait_ms(200);
+ }
+
+ if (tries == MAX_TRIES) {
+ USB_HUB_PRINTF("Cannot enable port %i after %i retries, " \
+ "disabling port.\n", port + 1, MAX_TRIES);
+ USB_HUB_PRINTF("Maybe the USB cable is bad?\n");
+ return -1;
+ }
+
+ usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
+ *portstat = portstatus;
+ return 0;
+}
+
+
+void usb_hub_port_connect_change(struct usb_device *dev, int port)
+{
+ struct usb_device *usb;
+ struct usb_port_status portsts;
+ unsigned short portstatus;
+
+ /* Check status */
+ if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
+ USB_HUB_PRINTF("get_port_status failed\n");
+ return;
+ }
+
+ portstatus = le16_to_cpu(portsts.wPortStatus);
+ USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
+ portstatus,
+ le16_to_cpu(portsts.wPortChange),
+ portspeed(portstatus));
+
+ /* Clear the connection change status */
+ usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
+
+ /* Disconnect any existing devices under this port */
+ if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
+ (!(portstatus & USB_PORT_STAT_ENABLE))) || (dev->children[port])) {
+ USB_HUB_PRINTF("usb_disconnect(&hub->children[port]);\n");
+ /* Return now if nothing is connected */
+ if (!(portstatus & USB_PORT_STAT_CONNECTION))
+ return;
+ }
+ wait_ms(200);
+
+ /* Reset the port */
+ if (hub_port_reset(dev, port, &portstatus) < 0) {
+ printf("cannot reset port %i!?\n", port + 1);
+ return;
+ }
+
+ wait_ms(200);
+
+ /* Allocate a new device struct for it */
+ usb = usb_alloc_new_device();
+
+ if (portstatus & USB_PORT_STAT_HIGH_SPEED)
+ usb->speed = USB_SPEED_HIGH;
+ else if (portstatus & USB_PORT_STAT_LOW_SPEED)
+ usb->speed = USB_SPEED_LOW;
+ else
+ usb->speed = USB_SPEED_FULL;
+
+ dev->children[port] = usb;
+ usb->parent = dev;
+ usb->portnr = port + 1;
+ /* Run it through the hoops (find a driver, etc) */
+ if (usb_new_device(usb)) {
+ /* Woops, disable the port */
+ USB_HUB_PRINTF("hub: disabling port %d\n", port + 1);
+ usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
+ }
+}
+
+
+static int usb_hub_configure(struct usb_device *dev)
+{
+ int i;
+ unsigned char buffer[USB_BUFSIZ], *bitmap;
+ struct usb_hub_descriptor *descriptor;
+ struct usb_hub_device *hub;
+#ifdef USB_HUB_DEBUG
+ struct usb_hub_status *hubsts;
+#endif
+
+ /* "allocate" Hub device */
+ hub = usb_hub_allocate();
+ if (hub == NULL)
+ return -1;
+ hub->pusb_dev = dev;
+ /* Get the the hub descriptor */
+ if (usb_get_hub_descriptor(dev, buffer, 4) < 0) {
+ USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
+ "descriptor, giving up %lX\n", dev->status);
+ return -1;
+ }
+ descriptor = (struct usb_hub_descriptor *)buffer;
+
+ /* silence compiler warning if USB_BUFSIZ is > 256 [= sizeof(char)] */
+ i = descriptor->bLength;
+ if (i > USB_BUFSIZ) {
+ USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
+ "descriptor - too long: %d\n",
+ descriptor->bLength);
+ return -1;
+ }
+
+ if (usb_get_hub_descriptor(dev, buffer, descriptor->bLength) < 0) {
+ USB_HUB_PRINTF("usb_hub_configure: failed to get hub " \
+ "descriptor 2nd giving up %lX\n", dev->status);
+ return -1;
+ }
+ memcpy((unsigned char *)&hub->desc, buffer, descriptor->bLength);
+ /* adjust 16bit values */
+ hub->desc.wHubCharacteristics =
+ le16_to_cpu(descriptor->wHubCharacteristics);
+ /* set the bitmap */
+ bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
+ /* devices not removable by default */
+ memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
+ bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
+ memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
+
+ for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
+ hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
+
+ for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
+ hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
+
+ dev->maxchild = descriptor->bNbrPorts;
+ USB_HUB_PRINTF("%d ports detected\n", dev->maxchild);
+
+ switch (hub->desc.wHubCharacteristics & HUB_CHAR_LPSM) {
+ case 0x00:
+ USB_HUB_PRINTF("ganged power switching\n");
+ break;
+ case 0x01:
+ USB_HUB_PRINTF("individual port power switching\n");
+ break;
+ case 0x02:
+ case 0x03:
+ USB_HUB_PRINTF("unknown reserved power switching mode\n");
+ break;
+ }
+
+ if (hub->desc.wHubCharacteristics & HUB_CHAR_COMPOUND)
+ USB_HUB_PRINTF("part of a compound device\n");
+ else
+ USB_HUB_PRINTF("standalone hub\n");
+
+ switch (hub->desc.wHubCharacteristics & HUB_CHAR_OCPM) {
+ case 0x00:
+ USB_HUB_PRINTF("global over-current protection\n");
+ break;
+ case 0x08:
+ USB_HUB_PRINTF("individual port over-current protection\n");
+ break;
+ case 0x10:
+ case 0x18:
+ USB_HUB_PRINTF("no over-current protection\n");
+ break;
+ }
+
+ USB_HUB_PRINTF("power on to power good time: %dms\n",
+ descriptor->bPwrOn2PwrGood * 2);
+ USB_HUB_PRINTF("hub controller current requirement: %dmA\n",
+ descriptor->bHubContrCurrent);
+
+ for (i = 0; i < dev->maxchild; i++)
+ USB_HUB_PRINTF("port %d is%s removable\n", i + 1,
+ hub->desc.DeviceRemovable[(i + 1) / 8] & \
+ (1 << ((i + 1) % 8)) ? " not" : "");
+
+ if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
+ USB_HUB_PRINTF("usb_hub_configure: failed to get Status - " \
+ "too long: %d\n", descriptor->bLength);
+ return -1;
+ }
+
+ if (usb_get_hub_status(dev, buffer) < 0) {
+ USB_HUB_PRINTF("usb_hub_configure: failed to get Status %lX\n",
+ dev->status);
+ return -1;
+ }
+
+#ifdef USB_HUB_DEBUG
+ hubsts = (struct usb_hub_status *)buffer;
+#endif
+ USB_HUB_PRINTF("get_hub_status returned status %X, change %X\n",
+ le16_to_cpu(hubsts->wHubStatus),
+ le16_to_cpu(hubsts->wHubChange));
+ USB_HUB_PRINTF("local power source is %s\n",
+ (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
+ "lost (inactive)" : "good");
+ USB_HUB_PRINTF("%sover-current condition exists\n",
+ (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
+ "" : "no ");
+ usb_hub_power_on(hub);
+
+ for (i = 0; i < dev->maxchild; i++) {
+ struct usb_port_status portsts;
+ unsigned short portstatus, portchange;
+
+ if (usb_get_port_status(dev, i + 1, &portsts) < 0) {
+ USB_HUB_PRINTF("get_port_status failed\n");
+ continue;
+ }
+
+ portstatus = le16_to_cpu(portsts.wPortStatus);
+ portchange = le16_to_cpu(portsts.wPortChange);
+ USB_HUB_PRINTF("Port %d Status %X Change %X\n",
+ i + 1, portstatus, portchange);
+
+ if (portchange & USB_PORT_STAT_C_CONNECTION) {
+ USB_HUB_PRINTF("port %d connection change\n", i + 1);
+ usb_hub_port_connect_change(dev, i);
+ }
+ if (portchange & USB_PORT_STAT_C_ENABLE) {
+ USB_HUB_PRINTF("port %d enable change, status %x\n",
+ i + 1, portstatus);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_C_ENABLE);
+
+ /* EM interference sometimes causes bad shielded USB
+ * devices to be shutdown by the hub, this hack enables
+ * them again. Works at least with mouse driver */
+ if (!(portstatus & USB_PORT_STAT_ENABLE) &&
+ (portstatus & USB_PORT_STAT_CONNECTION) &&
+ ((dev->children[i]))) {
+ USB_HUB_PRINTF("already running port %i " \
+ "disabled by hub (EMI?), " \
+ "re-enabling...\n", i + 1);
+ usb_hub_port_connect_change(dev, i);
+ }
+ }
+ if (portstatus & USB_PORT_STAT_SUSPEND) {
+ USB_HUB_PRINTF("port %d suspend change\n", i + 1);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_SUSPEND);
+ }
+
+ if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
+ USB_HUB_PRINTF("port %d over-current change\n", i + 1);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_C_OVER_CURRENT);
+ usb_hub_power_on(hub);
+ }
+
+ if (portchange & USB_PORT_STAT_C_RESET) {
+ USB_HUB_PRINTF("port %d reset change\n", i + 1);
+ usb_clear_port_feature(dev, i + 1,
+ USB_PORT_FEAT_C_RESET);
+ }
+ } /* end for i all ports */
+
+ return 0;
+}
+
+int usb_hub_probe(struct usb_device *dev, int ifnum)
+{
+ struct usb_interface *iface;
+ struct usb_endpoint_descriptor *ep;
+ int ret;
+
+ iface = &dev->config.if_desc[ifnum];
+ /* Is it a hub? */
+ if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
+ return 0;
+ /* Some hubs have a subclass of 1, which AFAICT according to the */
+ /* specs is not defined, but it works */
+ if ((iface->desc.bInterfaceSubClass != 0) &&
+ (iface->desc.bInterfaceSubClass != 1))
+ return 0;
+ /* Multiple endpoints? What kind of mutant ninja-hub is this? */
+ if (iface->desc.bNumEndpoints != 1)
+ return 0;
+ ep = &iface->ep_desc[0];
+ /* Output endpoint? Curiousier and curiousier.. */
+ if (!(ep->bEndpointAddress & USB_DIR_IN))
+ return 0;
+ /* If it's not an interrupt endpoint, we'd better punt! */
+ if ((ep->bmAttributes & 3) != 3)
+ return 0;
+ /* We found a hub */
+ USB_HUB_PRINTF("USB hub found\n");
+ ret = usb_hub_configure(dev);
+ return ret;
+}