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authorJulius Werner <jwerner@chromium.org>2019-07-10 15:53:59 -0700
committerPatrick Georgi <pgeorgi@google.com>2019-08-22 10:37:26 +0000
commit277498c2834a11c337faf3677782943f210a5c1f (patch)
treeef43974418f75584c4a665c7d1a6430ec774bacd /payloads/libpayload/include/usb/usbmsc.h
parent182fea717e413bf3c0920920da13a98aa8fe890c (diff)
libpayload: usbmsc: Factor out usb_msc_force_init() function
We're planning to have a use case with a custom USB device that implements the USB mass storage protocol on its bulk endpoints, but does not have the normal MSC class/protocol interface descriptors and does not support class-specific control requests (Get Max LUN and Bulk-Only Reset). We'd like to identify/enumerate the device via usb_generic_create() in our payload but then reuse all the normal MSC driver code. In order to make that possible, this patch factors a new usb_msc_force_init() function out of usb_msc_init() which will initialize an MSC device without checking its descriptors. It also adds some "quirks" flags that allow devices registered this way to customize behavior of the MSC stack. Change-Id: I50392128409cb2a879954f234149a5e3b060a229 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/34227 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'payloads/libpayload/include/usb/usbmsc.h')
-rw-r--r--payloads/libpayload/include/usb/usbmsc.h17
1 files changed, 16 insertions, 1 deletions
diff --git a/payloads/libpayload/include/usb/usbmsc.h b/payloads/libpayload/include/usb/usbmsc.h
index f4562a56d5..8786586e51 100644
--- a/payloads/libpayload/include/usb/usbmsc.h
+++ b/payloads/libpayload/include/usb/usbmsc.h
@@ -34,13 +34,24 @@ typedef struct {
unsigned int numblocks;
endpoint_t *bulk_in;
endpoint_t *bulk_out;
- u8 usbdisk_created;
+ u8 quirks : 7;
+ u8 usbdisk_created : 1;
s8 ready;
u8 lun;
u8 num_luns;
void *data; /* For use by consumers of libpayload. */
} usbmsc_inst_t;
+/* Possible values for quirks field. */
+enum {
+ /* Don't check for LUNs (force assumption that there's only one LUN). */
+ USB_MSC_QUIRK_NO_LUNS = 1 << 0,
+ /* Never do a BULK_ONLY reset, just continue. This means that the device
+ cannot recover from phase errors and won't detach automatically for
+ unrecoverable errors. Do not use unless you have to. */
+ USB_MSC_QUIRK_NO_RESET = 1 << 1,
+};
+
/* Possible values for ready field. */
enum {
USB_MSC_DETACHED = -1, /* Disk detached or out to lunch. */
@@ -56,4 +67,8 @@ typedef enum { cbw_direction_data_in = 0x80, cbw_direction_data_out = 0
int readwrite_blocks_512 (usbdev_t *dev, int start, int n, cbw_direction dir, u8 *buf);
int readwrite_blocks (usbdev_t *dev, int start, int n, cbw_direction dir, u8 *buf);
+/* Force a device to enumerate as MSC, without checking class/protocol types.
+ It must still have a bulk endpoint pair and respond to MSC commands. */
+void usb_msc_force_init (usbdev_t *dev, u32 quirks);
+
#endif