In order to support boot scripts that dynamically create kernel arguments that describe the boot device, a method is needed to determine what USB host controller number is associated with current usb storage device set via 'usb dev <n>'.
This patch dynamically sets the 'usbdevport' env variable according to the instance number of the EHCI host controller when the usb storage device is set with the 'usb dev <n>' command.
This is currently being used to be able to pass a kernel command-line argument the the IMX Android kernel to tell it which USB host device to boot from: fsl-ehci.0 (OTG) or fsl-ehci.1 (EHCI).
Signed-off-by: Tim Harvey tharvey@gateworks.com --- common/usb_storage.c | 71 ++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 61 insertions(+), 10 deletions(-)
diff --git a/common/usb_storage.c b/common/usb_storage.c index 6ac358d..628eef3 100644 --- a/common/usb_storage.c +++ b/common/usb_storage.c @@ -160,10 +160,66 @@ unsigned long usb_stor_write(int device, lbaint_t blknr, struct usb_device * usb_get_dev_index(int index); void uhci_show_temp_int_td(void);
+struct usb_device *get_usb_dev(int index) +{ + struct usb_device *dev; + int i; + + dev = NULL; + for (i = 0; i < USB_MAX_DEVICE; i++) { + dev = usb_get_dev_index(i); + if (dev == NULL) + return NULL; + if (dev->devnum == usb_dev_desc[index].target) + break; + } + + return dev; +} + #ifdef CONFIG_PARTITIONS block_dev_desc_t *usb_stor_get_dev(int index) { - return (index < usb_max_devs) ? &usb_dev_desc[index] : NULL; + block_dev_desc_t *ret; + + ret = (index < usb_max_devs) ? &usb_dev_desc[index] : NULL; + if (ret) { + int port = -1; + struct usb_device *dev = get_usb_dev(index); + + if (dev && dev->parent) { + /* dev->devnum is device number on USB bus */ + struct usb_device *parent = dev->parent; + struct usb_device *p; + int i, j; + + /* find host controller for this device */ + while (parent->parent) + parent = parent->parent; + /* find host controller index */ + for (i = 0, j = 0; i < USB_MAX_DEVICE; i++) { + p = usb_get_dev_index(i); + if (!p) + break; + /* host controller */ + if (!p->parent) { + if (parent == p) { + port = j; + break; + } + j++; + } + } + } + if (port < 0) { + printf("cannot locate device's port.\n"); + } else { + char buf[5]; + sprintf(buf, "%d", port); + setenv("usbdevport", buf); + } + } + return ret; } #endif
@@ -1053,15 +1109,10 @@ unsigned long usb_stor_read(int device, lbaint_t blknr,
device &= 0xff; /* Setup device */ - debug("\nusb_read: dev %d \n", device); - dev = NULL; - for (i = 0; i < USB_MAX_DEVICE; i++) { - dev = usb_get_dev_index(i); - if (dev == NULL) - return 0; - if (dev->devnum == usb_dev_desc[device].target) - break; - } + debug("\nusb_read: dev %d\n", device); + dev = get_usb_dev(device); + if (!dev) + return 0; ss = (struct us_data *)dev->privptr;
usb_disable_asynch(1); /* asynch transfer not allowed */