[U-Boot] [PATCH 2/7] usb: rockchip: implement skeleton for K_FW_GET_CHIP_VER command

[Alberto Panizzo]

Chip Version is a string saved in BOOTROM address space Little Endian.

Ex for rk3288: 0x33323041 0x32303134 0x30383133 0x56323030
which brings:  320A20140813V200

Note that memory version do invert MSB/LSB so printing the char
buffer will show: A02341023180002V

Signed-off-by: Alberto Panizzo <alberto at amarulasolutions.com>
---
 drivers/usb/gadget/f_rockusb.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/f_rockusb.c b/drivers/usb/gadget/f_rockusb.c
index a39ad51..7612871 100644
--- a/drivers/usb/gadget/f_rockusb.c
+++ b/drivers/usb/gadget/f_rockusb.c
@@ -532,6 +532,42 @@ static void cb_read_storage_id(struct usb_ep *ep, struct usb_request *req)
 					 CSW_GOOD);
 }
 
+int __weak rk_get_bootrom_chip_version(unsigned int *chip_info, int size)
+{
+	return 0;
+}
+
+static void cb_get_chip_version(struct usb_ep *ep, struct usb_request *req)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(struct fsg_bulk_cb_wrap, cbw,
+				 sizeof(struct fsg_bulk_cb_wrap));
+	unsigned int chip_info[4], i;
+
+	memset(chip_info, 0, sizeof(chip_info));
+	rk_get_bootrom_chip_version(chip_info, 4);
+
+	/*
+	 * Chip Version is a string saved in BOOTROM address space Little Endian
+	 *
+	 * Ex for rk3288: 0x33323041 0x32303134 0x30383133 0x56323030
+	 * which brings:  320A20140813V200
+	 *
+	 * Note that memory version do invert MSB/LSB so printing the char
+	 * buffer will show: A02341023180002V
+	 */
+	printf("read chip version: ");
+	for (i = 0; i < 16; i++) {
+		int shift = (3 - (i % 4)) * 8;
+
+		printf("%c", (char)((chip_info[i / 4] >> shift) & 0xFF));
+	}
+	printf("\n");
+	memcpy((char *)cbw, req->buf, USB_BULK_CB_WRAP_LEN);
+	rockusb_tx_write((char *)chip_info, sizeof(chip_info));
+	rockusb_tx_write_csw_on_complete(cbw->tag, cbw->data_transfer_length,
+					 CSW_GOOD);
+}
+
 static void cb_write_lba(struct usb_ep *ep, struct usb_request *req)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(struct fsg_bulk_cb_wrap, cbw,
@@ -670,7 +706,7 @@ static const struct cmd_dispatch_info cmd_dispatch_info[] = {
 	},
 	{
 		.cmd = K_FW_GET_CHIP_VER,
-		.cb = cb_not_support,
+		.cb = cb_get_chip_version,
 	},
 	{
 		.cmd = K_FW_LOW_FORMAT,
-- 
2.7.4