usb: rockchip: add the rockusb gadget

this patch implement rockusb protocol on the device side. this is based on
USB download gadget infrastructure. the rockusb function implements the rd,
wl, rid commands. it can work with rkdeveloptool

Signed-off-by: Eddie Cai <eddie.cai.linux@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 133 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-rockchip/f_rockusb.h b/arch/arm/include/asm/arch-rockchip/f_rockusb.h
new file mode 100644
index 00000000000..0e99f1b76d8
--- /dev/null
+++ b/arch/arm/include/asm/arch-rockchip/f_rockusb.h
@@ -0,0 +1,133 @@
+/*
+ * (C) Copyright 2017
+ *
+ * Eddie Cai <eddie.cai.linux@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _F_ROCKUSB_H_
+#define _F_ROCKUSB_H_
+#include <blk.h>
+
+#define ROCKUSB_VERSION		"0.1"
+
+#define ROCKUSB_INTERFACE_CLASS	0xff
+#define ROCKUSB_INTERFACE_SUB_CLASS	0x06
+#define ROCKUSB_INTERFACE_PROTOCOL	0x05
+
+#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0  0x0200
+#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  0x0040
+#define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      0x0040
+
+#define EP_BUFFER_SIZE			4096
+/*
+ * EP_BUFFER_SIZE must always be an integral multiple of maxpacket size
+ * (64 or 512 or 1024), else we break on certain controllers like DWC3
+ * that expect bulk OUT requests to be divisible by maxpacket size.
+ */
+
+#define RKUSB_BUF_SIZE		EP_BUFFER_SIZE * 2
+
+#define RKUSB_STATUS_IDLE			0
+#define RKUSB_STATUS_CMD			1
+#define RKUSB_STATUS_RXDATA			2
+#define RKUSB_STATUS_TXDATA			3
+#define RKUSB_STATUS_CSW			4
+#define RKUSB_STATUS_RXDATA_PREPARE		5
+#define RKUSB_STATUS_TXDATA_PREPARE		6
+
+enum rkusb_command {
+K_FW_TEST_UNIT_READY	= 0x00,
+K_FW_READ_FLASH_ID = 0x01,
+K_FW_SET_DEVICE_ID = 0x02,
+K_FW_TEST_BAD_BLOCK = 0x03,
+K_FW_READ_10 = 0x04,
+K_FW_WRITE_10 = 0x05,
+K_FW_ERASE_10 = 0x06,
+K_FW_WRITE_SPARE = 0x07,
+K_FW_READ_SPARE = 0x08,
+
+K_FW_ERASE_10_FORCE = 0x0b,
+K_FW_GET_VERSION = 0x0c,
+
+K_FW_LBA_READ_10 = 0x14,
+K_FW_LBA_WRITE_10 = 0x15,
+K_FW_ERASE_SYS_DISK = 0x16,
+K_FW_SDRAM_READ_10 = 0x17,
+K_FW_SDRAM_WRITE_10 = 0x18,
+K_FW_SDRAM_EXECUTE = 0x19,
+K_FW_READ_FLASH_INFO = 0x1A,
+K_FW_GET_CHIP_VER = 0x1B,
+K_FW_LOW_FORMAT = 0x1C,
+K_FW_SET_RESET_FLAG = 0x1E,
+K_FW_SPI_READ_10 = 0x21,
+K_FW_SPI_WRITE_10 = 0x22,
+
+K_FW_SESSION = 0X30,
+K_FW_RESET = 0xff,
+};
+
+#define CBW_DIRECTION_OUT		0x00
+#define CBW_DIRECTION_IN		0x80
+
+struct cmd_dispatch_info {
+	enum rkusb_command cmd;
+	/* call back function to handle rockusb command */
+	void (*cb)(struct usb_ep *ep, struct usb_request *req);
+};
+
+/* Bulk-only data structures */
+
+/* Command Block Wrapper */
+struct fsg_bulk_cb_wrap {
+	__le32  signature;              /* Contains 'USBC' */
+	u32     tag;                    /* Unique per command id */
+	__le32  data_transfer_length;   /* Size of the data */
+	u8      flags;                  /* Direction in bit 7 */
+	u8      lun;                    /* lun (normally 0) */
+	u8      length;                 /* Of the CDB, <= MAX_COMMAND_SIZE */
+	u8      CDB[16];                /* Command Data Block */
+};
+
+#define USB_BULK_CB_WRAP_LEN    31
+#define USB_BULK_CB_SIG         0x43425355      /* Spells out USBC */
+#define USB_BULK_IN_FLAG        0x80
+
+/* Command status Wrapper */
+struct bulk_cs_wrap {
+	__le32  signature;              /* Should = 'USBS' */
+	u32     tag;                    /* Same as original command */
+	__le32  residue;                /* Amount not transferred */
+	u8      status;                 /* See below */
+};
+
+#define USB_BULK_CS_WRAP_LEN    13
+#define USB_BULK_CS_SIG         0x53425355      /* Spells out 'USBS' */
+#define USB_STATUS_PASS         0
+#define USB_STATUS_FAIL         1
+#define USB_STATUS_PHASE_ERROR  2
+
+#define CSW_GOOD                0x00
+#define CSW_FAIL                0x01
+
+struct f_rockusb {
+	struct usb_function usb_function;
+	struct usb_ep *in_ep, *out_ep;
+	struct usb_request *in_req, *out_req;
+	char *dev_type;
+	unsigned int dev_index;
+	unsigned int tag;
+	unsigned int lba;
+	unsigned int dl_size;
+	unsigned int dl_bytes;
+	struct blk_desc *desc;
+	int reboot_flag;
+	void *buf;
+	void *buf_head;
+};
+
+/* init rockusb device, tell rockusb which device you want to read/write*/
+void rockusb_dev_init(char *dev_type, int dev_index);
+#endif /* _F_ROCKUSB_H_ */
+