musb-new: port of Linux musb driver

Existing U-Boot musb driver has no support for the new gadget framework
and also seems to have other limitations. As gadget framework is ported
from Linux it seems pretty natural to port musb gadget driver as well.

This driver supports both host and peripheral modes.

This is not a replacement for current musb driver (at least now) as
there are still some consumers of the old UDC interface.

No DMA operation support included, CONFIG_MUSB_PIO_ONLY should be
defined.

Virtual root hub device is not implemented.

Known problems: with no devices connected usb_lowlevel_start() fails.

Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/drivers/usb/musb-new/usb-compat.h b/drivers/usb/musb-new/usb-compat.h
new file mode 100644
index 0000000..27f656f
--- /dev/null
+++ b/drivers/usb/musb-new/usb-compat.h
@@ -0,0 +1,88 @@
+#ifndef __USB_COMPAT_H__
+#define __USB_COMPAT_H__
+
+#include "usb.h"
+
+struct usb_hcd {
+	void *hcd_priv;
+};
+
+struct usb_host_endpoint {
+	struct usb_endpoint_descriptor		desc;
+	struct list_head urb_list;
+	void *hcpriv;
+};
+
+/*
+ * urb->transfer_flags:
+ *
+ * Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb().
+ */
+#define URB_SHORT_NOT_OK	0x0001	/* report short reads as errors */
+#define URB_ZERO_PACKET		0x0040	/* Finish bulk OUT with short packet */
+
+struct urb;
+
+typedef void (*usb_complete_t)(struct urb *);
+
+struct urb {
+	void *hcpriv;			/* private data for host controller */
+	struct list_head urb_list;	/* list head for use by the urb's
+					 * current owner */
+	struct usb_device *dev;		/* (in) pointer to associated device */
+	struct usb_host_endpoint *ep;	/* (internal) pointer to endpoint */
+	unsigned int pipe;		/* (in) pipe information */
+	int status;			/* (return) non-ISO status */
+	unsigned int transfer_flags;	/* (in) URB_SHORT_NOT_OK | ...*/
+	void *transfer_buffer;		/* (in) associated data buffer */
+	dma_addr_t transfer_dma;	/* (in) dma addr for transfer_buffer */
+	u32 transfer_buffer_length;	/* (in) data buffer length */
+	u32 actual_length;		/* (return) actual transfer length */
+	unsigned char *setup_packet;	/* (in) setup packet (control only) */
+	int start_frame;		/* (modify) start frame (ISO) */
+	usb_complete_t complete;	/* (in) completion routine */
+};
+
+#define usb_hcd_link_urb_to_ep(hcd, urb)	({		\
+	int ret = 0;						\
+	list_add_tail(&urb->urb_list, &urb->ep->urb_list);	\
+	ret; })
+#define usb_hcd_unlink_urb_from_ep(hcd, urb)	list_del_init(&urb->urb_list)
+
+static inline void usb_hcd_giveback_urb(struct usb_hcd *hcd,
+					struct urb *urb,
+					int status)
+{
+	urb->status = status;
+	if (urb->complete)
+		urb->complete(urb);
+}
+
+static inline int usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd,
+					struct urb *urb)
+{
+	/* TODO: add cache invalidation here */
+	return 0;
+}
+
+static inline u16 find_tt(struct usb_device *dev)
+{
+	u8 chid;
+	u8 hub;
+
+	/* Find out the nearest parent which is high speed */
+	while (dev->parent->parent != NULL)
+		if (dev->parent->speed != USB_SPEED_HIGH)
+			dev = dev->parent;
+		else
+			break;
+
+	/* determine the port address at that hub */
+	hub = dev->parent->devnum;
+	for (chid = 0; chid < USB_MAXCHILDREN; chid++)
+		if (dev->parent->children[chid] == dev)
+			break;
+
+	return (hub << 8) | chid;
+}
+#endif /* __USB_COMPAT_H__ */