usb: rockchip: implement K_FW_LBA_READ_10 command

This patch implement reading blocks form selected device with
LBA addressing.

Corresponding command on workstation is:
rkdeveloptool rl <start_blk> <blk_cnt> <file>

While we support reading more than one blocks per K_FW_LBA_READ_10
request, rkdeveloptool and original rockchip tool do perform
chunk reads limiting the maximum size per chunk far lower
than max int values.

Signed-off-by: Alberto Panizzo <alberto@amarulasolutions.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/arch-rockchip/f_rockusb.h

@@ -27,6 +27,7 @@
  */
 
 #define RKUSB_BUF_SIZE		EP_BUFFER_SIZE * 2
+#define RKBLOCK_BUF_SIZE		4096
 
 #define RKUSB_STATUS_IDLE			0
 #define RKUSB_STATUS_CMD			1
@@ -120,6 +121,8 @@ struct f_rockusb {
 	unsigned int lba;
 	unsigned int dl_size;
 	unsigned int dl_bytes;
+	unsigned int ul_size;
+	unsigned int ul_bytes;
 	struct blk_desc *desc;
 	int reboot_flag;
 	void *buf;

doc/README.rockusb

@@ -47,6 +47,7 @@ Current set of rkdeveloptool commands supported:
 - rfi: Read Flash Id
 - rd : Reset Device
 - td : Test Device Ready
+- rl : Read blocks using LBA
 - wl : Write blocks using LBA
 
 To do

drivers/usb/gadget/f_rockusb.c

@@ -328,6 +328,7 @@ static int rockusb_tx_write(const char *buffer, unsigned int buffer_size)
 
 	memcpy(in_req->buf, buffer, buffer_size);
 	in_req->length = buffer_size;
+	debug("Transferring 0x%x bytes\n", buffer_size);
 	usb_ep_dequeue(rockusb_func->in_ep, in_req);
 	ret = usb_ep_queue(rockusb_func->in_ep, in_req, 0);
 	if (ret)
@@ -421,6 +422,65 @@ static unsigned int rx_bytes_expected(struct usb_ep *ep)
 	return rx_remain;
 }
 
+/* usb_request complete call back to handle upload image */
+static void tx_handler_ul_image(struct usb_ep *ep, struct usb_request *req)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, rbuffer, RKBLOCK_BUF_SIZE);
+	struct f_rockusb *f_rkusb = get_rkusb();
+	struct usb_request *in_req = rockusb_func->in_req;
+	int ret;
+
+	/* Print error status of previous transfer */
+	if (req->status)
+		debug("status: %d ep '%s' trans: %d len %d\n", req->status,
+		      ep->name, req->actual, req->length);
+
+	/* On transfer complete reset in_req and feedback host with CSW_GOOD */
+	if (f_rkusb->ul_bytes >= f_rkusb->ul_size) {
+		in_req->length = 0;
+		in_req->complete = rockusb_complete;
+
+		rockusb_tx_write_csw(f_rkusb->tag, 0, CSW_GOOD,
+				     USB_BULK_CS_WRAP_LEN);
+		return;
+	}
+
+	/* Proceed with current chunk */
+	unsigned int transfer_size = f_rkusb->ul_size - f_rkusb->ul_bytes;
+
+	if (transfer_size > RKBLOCK_BUF_SIZE)
+		transfer_size = RKBLOCK_BUF_SIZE;
+	/* Read at least one block */
+	unsigned int blkcount = (transfer_size + f_rkusb->desc->blksz - 1) /
+				f_rkusb->desc->blksz;
+
+	debug("ul %x bytes, %x blks, read lba %x, ul_size:%x, ul_bytes:%x, ",
+	      transfer_size, blkcount, f_rkusb->lba,
+	      f_rkusb->ul_size, f_rkusb->ul_bytes);
+
+	int blks = blk_dread(f_rkusb->desc, f_rkusb->lba, blkcount, rbuffer);
+
+	if (blks != blkcount) {
+		printf("failed reading from device %s: %d\n",
+		       f_rkusb->dev_type, f_rkusb->dev_index);
+		rockusb_tx_write_csw(f_rkusb->tag, 0, CSW_FAIL,
+				     USB_BULK_CS_WRAP_LEN);
+		return;
+	}
+	f_rkusb->lba += blkcount;
+	f_rkusb->ul_bytes += transfer_size;
+
+	/* Proceed with USB request */
+	memcpy(in_req->buf, rbuffer, transfer_size);
+	in_req->length = transfer_size;
+	in_req->complete = tx_handler_ul_image;
+	printf("Uploading 0x%x bytes\n", transfer_size);
+	usb_ep_dequeue(rockusb_func->in_ep, in_req);
+	ret = usb_ep_queue(rockusb_func->in_ep, in_req, 0);
+	if (ret)
+		printf("Error %d on queue\n", ret);
+}
+
 /* usb_request complete call back to handle down load image */
 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
 {
@@ -565,6 +625,48 @@ static void cb_get_chip_version(struct usb_ep *ep, struct usb_request *req)
 	rockusb_tx_write((char *)chip_info, sizeof(chip_info));
 }
 
+static void cb_read_lba(struct usb_ep *ep, struct usb_request *req)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(struct fsg_bulk_cb_wrap, cbw,
+				 sizeof(struct fsg_bulk_cb_wrap));
+	struct f_rockusb *f_rkusb = get_rkusb();
+	int sector_count;
+
+	memcpy((char *)cbw, req->buf, USB_BULK_CB_WRAP_LEN);
+	sector_count = (int)get_unaligned_be16(&cbw->CDB[7]);
+	f_rkusb->tag = cbw->tag;
+
+	if (!f_rkusb->desc) {
+		char *type = f_rkusb->dev_type;
+		int index = f_rkusb->dev_index;
+
+		f_rkusb->desc = blk_get_dev(type, index);
+		if (!f_rkusb->desc ||
+		    f_rkusb->desc->type == DEV_TYPE_UNKNOWN) {
+			printf("invalid device \"%s\", %d\n", type, index);
+			rockusb_tx_write_csw(f_rkusb->tag, 0, CSW_FAIL,
+					     USB_BULK_CS_WRAP_LEN);
+			return;
+		}
+	}
+
+	f_rkusb->lba = get_unaligned_be32(&cbw->CDB[2]);
+	f_rkusb->ul_size = sector_count * f_rkusb->desc->blksz;
+	f_rkusb->ul_bytes = 0;
+
+	debug("require read %x bytes, %x sectors from lba %x\n",
+	      f_rkusb->ul_size, sector_count, f_rkusb->lba);
+
+	if (f_rkusb->ul_size == 0)  {
+		rockusb_tx_write_csw(cbw->tag, cbw->data_transfer_length,
+				     CSW_FAIL, USB_BULK_CS_WRAP_LEN);
+		return;
+	}
+
+	/* Start right now sending first chunk */
+	tx_handler_ul_image(ep, req);
+}
+
 static void cb_write_lba(struct usb_ep *ep, struct usb_request *req)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(struct fsg_bulk_cb_wrap, cbw,
@@ -675,7 +777,7 @@ static const struct cmd_dispatch_info cmd_dispatch_info[] = {
 	},
 	{
 		.cmd = K_FW_LBA_READ_10,
-		.cb = cb_not_support,
+		.cb = cb_read_lba,
 	},
 	{
 		.cmd = K_FW_LBA_WRITE_10,