Patchwork [U-Boot,v4,2/2] qi_lb60: add software usbboot support

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Submitter Xiangfu Liu
Date Oct. 11, 2012, 3:17 a.m.
Message ID <1349925477-18534-2-git-send-email-xiangfu@openmobilefree.net>
Download mbox | patch
Permalink /patch/190800/
State Superseded
Headers show

Comments

Xiangfu Liu - Oct. 11, 2012, 3:17 a.m.
From: Xiangfu <xiangfu@openmobilefree.net>

  JZ4740 CPU have a internal ROM have such kind of code, that make
  JZ4740 can boot from USB

  usbboot.S can downloads user program from the USB port to internal
  SRAM and branches to the internal SRAM to execute the program

Signed-off-by: Xiangfu <xiangfu@openmobilefree.net>
---
 board/qi/qi_lb60/Makefile      |    1 +
 board/qi/qi_lb60/qi_lb60-spl.c |   21 +
 board/qi/qi_lb60/usbboot.S     |  838 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 860 insertions(+)
 create mode 100644 board/qi/qi_lb60/usbboot.S

Patch

diff --git a/board/qi/qi_lb60/Makefile b/board/qi/qi_lb60/Makefile
index e399246..6dd8c6f 100644
--- a/board/qi/qi_lb60/Makefile
+++ b/board/qi/qi_lb60/Makefile
@@ -23,6 +23,7 @@  include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(BOARD).o
 
 ifeq ($(CONFIG_SPL_BUILD),y)
+SOBJS	:= usbboot.o
 COBJS	:= $(BOARD)-spl.o
 else
 COBJS	:= $(BOARD).o
diff --git a/board/qi/qi_lb60/qi_lb60-spl.c b/board/qi/qi_lb60/qi_lb60-spl.c
index 739cd37..44d5dd6 100644
--- a/board/qi/qi_lb60/qi_lb60-spl.c
+++ b/board/qi/qi_lb60/qi_lb60-spl.c
@@ -12,6 +12,22 @@ 
 #include <asm/io.h>
 #include <asm/jz4740.h>
 
+#define KEY_U_OUT       (32 * 2 + 16)
+#define KEY_U_IN        (32 * 3 + 19)
+
+static int is_usb_boot()
+{
+	__gpio_as_input(KEY_U_IN);
+	__gpio_enable_pull(KEY_U_IN);
+	__gpio_as_output(KEY_U_OUT);
+	__gpio_clear_pin(KEY_U_OUT);
+
+	if (__gpio_get_pin(KEY_U_IN) == 0)
+		return 1;
+
+	return 0;
+}
+
 void nand_spl_boot(void)
 {
 	uint32_t reg;
@@ -26,6 +42,11 @@  void nand_spl_boot(void)
 	pll_init();
 	sdram_init();
 
+	if (is_usb_boot()) {
+		serial_puts("[U] pressed, goto USBBOOT mode\n");
+		usb_boot();
+	}
+
 	nand_init();
 
 	serial_puts("\nStarting U-Boot ...\n");
diff --git a/board/qi/qi_lb60/usbboot.S b/board/qi/qi_lb60/usbboot.S
new file mode 100644
index 0000000..c872266
--- /dev/null
+++ b/board/qi/qi_lb60/usbboot.S
@@ -0,0 +1,838 @@ 
+/*
+ *  for jz4740 usb boot
+ *
+ *  Copyright (c) 2009 Author: <jlwei@ingenic.cn>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+    .set noreorder
+    .globl usb_boot
+    .text
+
+/*
+ * Both NAND and USB boot load data to D-Cache first, then transfer
+ * data from D-Cache to I-Cache, and jump to execute the code in I-Cache.
+ * So init caches first and then dispatch to a proper boot routine.
+ */
+
+.macro load_addr reg addr
+	li \reg, 0x80000000
+	addiu \reg, \reg, \addr
+	la $2, usbboot_begin
+	subu \reg, \reg, $2
+.endm
+
+usb_boot:
+	/* Initialize PLL: set ICLK to 84MHz and HCLK to 42MHz. */
+	la	$9, 0xB0000000		/* CPCCR: Clock Control Register */
+	la	$8, 0x42041110		/* I:S:M:P=1:2:2:2 */
+	sw	$8, 0($9)
+
+	la	$9, 0xB0000010		/* CPPCR: PLL Control Register */
+	la	$8, 0x06000120		/* M=12 N=0 D=0 CLK=12*(M+2)/(N+2) */
+	sw	$8, 0($9)
+
+	mtc0	$0, $26		/* CP0_ERRCTL, restore WST reset state */
+	nop
+
+	mtc0	$0, $16			/* CP0_CONFIG */
+	nop
+
+	/* Relocate code to beginning of the ram */
+
+	la $2, usbboot_begin
+	la $3, usbboot_end
+	li $4, 0x80000000
+
+1:
+	lw $5, 0($2)
+	sw $5, 0($4)
+	addiu $2, $2, 4
+	bne $2, $3, 1b
+	addiu $4, $4, 4
+
+	li $2, 0x80000000
+	ori $3, $2, 0
+	addiu $3, $3, usbboot_end
+	la $4, usbboot_begin
+	subu $3, $3, $4
+
+
+2:
+	cache	0x0, 0($2)		/* Index_Invalidate_I */
+	cache	0x1, 0($2)		/* Index_Writeback_Inv_D */
+	addiu	$2, $2, 32
+	subu $4, $3, $2
+	bgtz	$4, 2b
+	nop
+
+	load_addr $3, usb_boot_return
+
+	jr $3
+
+usbboot_begin:
+
+init_caches:
+	li	$2, 3			/* cacheable for kseg0 access */
+	mtc0	$2, $16			/* CP0_CONFIG */
+	nop
+
+	li	$2, 0x20000000		/* enable idx-store-data cache insn */
+	mtc0	$2, $26			/* CP0_ERRCTL */
+
+	ori	$2, $28, 0		/* start address */
+	ori	$3, $2, 0x3fe0		/* end address, total 16KB */
+	mtc0	$0, $28, 0		/* CP0_TAGLO */
+	mtc0	$0, $28, 1		/* CP0_DATALO */
+cache_clear_a_line:
+	cache	0x8, 0($2)		/* Index_Store_Tag_I */
+	cache	0x9, 0($2)		/* Index_Store_Tag_D */
+	bne	$2, $3, cache_clear_a_line
+	addiu	$2, $2, 32		/* increment CACHE_LINE_SIZE */
+
+	ori	$2, $28, 0		/* start address */
+	ori	$3, $2, 0x3fe0		/* end address, total 16KB */
+	la	$4, 0x1ffff000		/* physical address and 4KB page mask */
+cache_alloc_a_line:
+	and	$5, $2, $4
+	ori	$5, $5, 1		/* V bit of the physical tag */
+	mtc0	$5, $28, 0		/* CP0_TAGLO */
+	cache	0x8, 0($2)		/* Index_Store_Tag_I */
+	cache	0x9, 0($2)		/* Index_Store_Tag_D */
+	bne	$2, $3, cache_alloc_a_line
+	addiu	$2, $2, 32		/* increment CACHE_LINE_SIZE */
+
+	nop
+	nop
+	nop
+	/*
+	 * Transfer data from dcache to icache, then jump to icache.
+	 * Input parameters:
+	 * $19: data length in bytes
+	 * $20: jump target address
+	 */
+xfer_d2i:
+
+	ori	$8, $20, 0
+	addu	$9, $8, $19		/* total 16KB */
+
+1:
+	cache	0x0, 0($8)		/* Index_Invalidate_I */
+	cache	0x1, 0($8)		/* Index_Writeback_Inv_D */
+	bne	$8, $9, 1b
+	addiu	$8, $8, 32
+
+	/* flush write-buffer */
+	sync
+
+	/* Invalidate BTB */
+	mfc0	$8, $16, 7		/* CP0_CONFIG */
+	nop
+	ori	$8, 2
+	mtc0	$8, $16, 7
+	nop
+
+	/* Overwrite config to disable ram initalisation */
+	li $2, 0xff
+	sb $2, 20($20)
+
+	jalr	$20
+	nop
+
+icache_return:
+	/* User code can return to here after executing itself in
+	  icache, by jumping to $31. */
+	b	usb_boot_return
+	nop
+
+
+usb_boot_return:
+	/* Enable the USB PHY */
+	la	$9, 0xB0000024		/* CPM_SCR */
+	lw	$8, 0($9)
+	ori	$8, 0x40		/* USBPHY_ENABLE */
+	sw	$8, 0($9)
+
+	/* Initialize USB registers */
+	la	$27, 0xb3040000	/* USB registers base address */
+
+	sb	$0, 0x0b($27)	/* INTRUSBE: disable common USB interrupts */
+	sh	$0, 0x06($27)	/* INTRINE: disable EPIN interrutps */
+	sh	$0, 0x08($27)	/* INTROUTE: disable EPOUT interrutps */
+
+	li	$9, 0x61
+	sb	$9, 0x01($27)	/* POWER: HSENAB | SUSPENDM | SOFTCONN */
+
+	/* Initialize USB states */
+	li	$22, 0			/* set EP0 to IDLE state */
+	li	$23, 1			/* no data stage */
+
+	/* Main loop of polling the usb commands */
+usb_command_loop:
+	lbu	$9, 0x0a($27)		/* read INTRUSB */
+	andi	$9, 0x04		/* check USB_INTR_RESET */
+	beqz	$9, check_intr_ep0in
+	nop
+
+ 	/* 1. Handle USB reset interrupt */
+handle_reset_intr:
+	lbu	$9, 0x01($27)		/* read POWER */
+	andi	$9, 0x10		/* test HS_MODE */
+	bnez	$9, _usb_set_maxpktsize
+	li	$9, 512			/* max packet size of HS mode */
+	li	$9, 64			/* max packet size of FS mode */
+
+_usb_set_maxpktsize:
+	li	$8, 1
+	sb	$8, 0x0e($27)		/* set INDEX 1 */
+
+	sh	$9, 0x10($27)		/* INMAXP */
+	sb	$0, 0x13($27)		/* INCSRH */
+	sh	$9, 0x14($27)		/* OUTMAXP */
+	sb	$0, 0x17($27)		/* OUTCSRH */
+
+_usb_flush_fifo:
+	li	$8, 0x48		/* INCSR_CDT && INCSR_FF */
+	sb	$8, 0x12($27)		/* INCSR */
+	li	$8, 0x90		/* OUTCSR_CDT && OUTCSR_FF */
+	sb	$8, 0x16($27)		/* OUTCSR */
+
+	li	$22, 0			/* set EP0 to IDLE state */
+	li	$23, 1			/* no data stage */
+
+	/* 2. Check and handle EP0 interrupt */
+check_intr_ep0in:
+	lhu	$10, 0x02($27)		/* read INTRIN */
+	andi	$9, $10, 0x1		/* check EP0 interrupt */
+	beqz	$9, check_intr_ep1in
+	nop
+
+handle_ep0_intr:
+	sb	$0, 0x0e($27)		/* set INDEX 0 */
+	lbu	$11, 0x12($27)		/* read CSR0 */
+
+	andi	$9, $11, 0x04		/* check SENTSTALL */
+	beqz	$9, _ep0_setupend
+	nop
+
+_ep0_sentstall:
+	andi	$9, $11, 0xdb
+	sb	$9, 0x12($27)		/* clear SENDSTALL and SENTSTALL */
+	li	$22, 0			/* set EP0 to IDLE state */
+
+_ep0_setupend:
+	andi	$9, $11, 0x10		/* check SETUPEND */
+	beqz	$9, ep0_idle_state
+	nop
+
+	ori	$9, $11, 0x80
+	sb	$9, 0x12($27)		/* set SVDSETUPEND */
+	li	$22, 0			/* set EP0 to IDLE state */
+
+ep0_idle_state:
+	bnez	$22, ep0_tx_state
+	nop
+
+	/* 2.1 Handle EP0 IDLE state interrupt */
+	andi	$9, $11, 0x01		/* check OUTPKTRDY */
+	beqz	$9, check_intr_ep1in
+	nop
+
+	/* Read 8-bytes setup packet from the FIFO */
+	lw	$25, 0x20($27)		/* first word of setup packet */
+	lw	$26, 0x20($27)		/* second word of setup packet */
+
+	andi	$9, $25, 0x60		/* bRequestType & USB_TYPE_MASK */
+	beqz	$9, _ep0_std_req
+	nop
+
+	/* 2.1.1 Vendor-specific setup request */
+_ep0_vend_req:
+	li	$22, 0			/* set EP0 to IDLE state */
+	li	$23, 1			/* NoData = 1 */
+
+	andi	$9, $25, 0xff00		/* check bRequest */
+	srl	$9, $9, 8
+	beqz	$9, __ep0_get_cpu_info
+	sub	$8, $9, 0x1
+	beqz	$8, __ep0_set_data_address
+	sub	$8, $9, 0x2
+	beqz	$8, __ep0_set_data_length
+	sub	$8, $9, 0x3
+	beqz	$8, __ep0_flush_caches
+	sub	$8, $9, 0x4
+	beqz	$8, __ep0_prog_start1
+	sub	$8, $9, 0x5
+	beqz	$8, __ep0_prog_start2
+	nop
+	b	_ep0_idle_state_fini	/* invalid request */
+	nop
+
+__ep0_get_cpu_info:
+	load_addr $20, cpu_info_data	/* data pointer to transfer */
+	li	$21, 8			/* bytes left to transfer */
+	li	$22, 1			/* set EP0 to TX state */
+	li	$23, 0			/* NoData = 0 */
+
+	b	_ep0_idle_state_fini
+	nop
+
+__ep0_set_data_address:
+	li	$9, 0xffff0000
+	and	$9, $25, $9
+	andi	$8, $26, 0xffff
+	or	$20, $9, $8		/* data address of next transfer */
+
+	b	_ep0_idle_state_fini
+	nop
+
+__ep0_set_data_length:
+	li	$9, 0xffff0000
+	and	$9, $25, $9
+	andi	$8, $26, 0xffff
+	or	$21, $9, $8		/* data length of next transfer */
+
+	li	$9, 0x48		/* SVDOUTPKTRDY and DATAEND */
+	sb	$9, 0x12($27)		/* CSR0 */
+
+	/* We must write packet to FIFO before EP1-IN interrupt here. */
+	b	handle_epin1_intr
+	nop
+
+__ep0_flush_caches:
+	/* Flush dcache and invalidate icache. */
+	li	$8, 0x80000000
+	addi	$9, $8, 0x3fe0		/* total 16KB */
+
+1:
+	cache	0x0, 0($8)		/* Index_Invalidate_I */
+	cache	0x1, 0($8)		/* Index_Writeback_Inv_D */
+	bne	$8, $9, 1b
+	addiu	$8, $8, 32
+
+	/* flush write-buffer */
+	sync
+
+	/* Invalidate BTB */
+	mfc0	$8, $16, 7		/* CP0_CONFIG */
+	nop
+	ori	$8, 2
+	mtc0	$8, $16, 7
+	nop
+
+	b	_ep0_idle_state_fini
+	nop
+
+__ep0_prog_start1:
+	li	$9, 0x48		/* SVDOUTPKTRDY and DATAEND */
+	sb	$9, 0x12($27)		/* CSR0 */
+
+	li	$9, 0xffff0000
+	and	$9, $25, $9
+	andi	$8, $26, 0xffff
+	or	$20, $9, $8		/* target address */
+
+	b	xfer_d2i
+	li	$19, 0x2000		/* 16KB data length */
+
+__ep0_prog_start2:
+	li	$9, 0x48		/* SVDOUTPKTRDY and DATAEND */
+	sb	$9, 0x12($27)		/* CSR0 */
+
+	li	$9, 0xffff0000
+	and	$9, $25, $9
+	andi	$8, $26, 0xffff
+	or	$20, $9, $8		/* target address */
+
+	jalr	$20		/* jump, and place the return address in $31 */
+	nop
+
+__ep0_prog_start2_return:
+/* User code can return to here after executing itself, by jumping to $31 */
+	b	usb_boot_return
+	nop
+
+	/* 2.1.2 Standard setup request */
+_ep0_std_req:
+	andi	$12, $25, 0xff00	/* check bRequest */
+	srl	$12, $12, 8
+	sub	$9, $12, 0x05		/* check USB_REQ_SET_ADDRESS */
+	bnez	$9, __ep0_req_set_config
+	nop
+
+	/* Handle USB_REQ_SET_ADDRESS */
+__ep0_req_set_addr:
+	srl	$9, $25, 16		/* get wValue */
+	sb	$9, 0x0($27)		/* set FADDR */
+	li	$23, 1			/* NoData = 1 */
+	b	_ep0_idle_state_fini
+	nop
+
+__ep0_req_set_config:
+	sub	$9, $12, 0x09		/* check USB_REQ_SET_CONFIGURATION */
+	bnez	$9, __ep0_req_get_desc
+	nop
+
+	/* Handle USB_REQ_SET_CONFIGURATION */
+	li	$23, 1			/* NoData = 1 */
+	b	_ep0_idle_state_fini
+	nop
+
+__ep0_req_get_desc:
+	sub	$9, $12, 0x06		/* check USB_REQ_GET_DESCRIPTOR */
+	bnez	$9, _ep0_idle_state_fini
+	li	$23, 1			/* NoData = 1 */
+
+	/* Handle USB_REQ_GET_DESCRIPTOR */
+	li	$23, 0			/* NoData = 0 */
+
+	srl	$9, $25, 24		/* wValue >> 8 */
+	sub	$8, $9, 0x01		/* check USB_DT_DEVICE */
+	beqz	$8, ___ep0_get_dev_desc
+	srl	$21, $26, 16		/* get wLength */
+	sub	$8, $9, 0x02		/* check USB_DT_CONFIG */
+	beqz	$8, ___ep0_get_conf_desc
+	sub	$8, $9, 0x03		/* check USB_DT_STRING */
+	beqz	$8, ___ep0_get_string_desc
+	sub	$8, $9, 0x06		/* check USB_DT_DEVICE_QUALIFIER */
+	beqz	$8, ___ep0_get_dev_qualifier
+	nop
+	b	_ep0_idle_state_fini
+	nop
+
+___ep0_get_dev_desc:
+	load_addr	$20, device_desc	/* data pointer */
+	li	$22, 1			/* set EP0 to TX state */
+	sub	$8, $21, 18
+	blez	$8, _ep0_idle_state_fini /* wLength <= 18 */
+	nop
+	li	$21, 18			/* max length of device_desc */
+	b	_ep0_idle_state_fini
+	nop
+
+___ep0_get_dev_qualifier:
+	load_addr	$20, dev_qualifier	/* data pointer */
+	li	$22, 1			/* set EP0 to TX state */
+	sub	$8, $21, 10
+	blez	$8, _ep0_idle_state_fini /* wLength <= 10 */
+	nop
+	li	$21, 10			/* max length of dev_qualifier */
+	b	_ep0_idle_state_fini
+	nop
+
+___ep0_get_conf_desc:
+	load_addr	$20, config_desc_fs	/* data pointer of FS mode */
+	lbu	$8, 0x01($27)		/* read POWER */
+	andi	$8, 0x10		/* test HS_MODE */
+	beqz	$8, ___ep0_get_conf_desc2
+	nop
+	load_addr $20, config_desc_hs	/* data pointer of HS mode */
+
+___ep0_get_conf_desc2:
+	li	$22, 1			/* set EP0 to TX state */
+	sub	$8, $21, 32
+	blez	$8, _ep0_idle_state_fini /* wLength <= 32 */
+	nop
+	li	$21, 32			/* max length of config_desc */
+	b	_ep0_idle_state_fini
+	nop
+
+___ep0_get_string_desc:
+	li	$22, 1			/* set EP0 to TX state */
+
+	srl	$9, $25, 16		/* wValue & 0xff */
+	andi	$9, 0xff
+
+	sub	$8, $9, 1
+	beqz	$8, ___ep0_get_string_manufacture
+	sub	$8, $9, 2
+	beqz	$8, ___ep0_get_string_product
+	nop
+
+___ep0_get_string_lang_ids:
+	load_addr	$20, string_lang_ids	/* data pointer */
+	b	_ep0_idle_state_fini
+	li	$21, 4			/* data length */
+
+___ep0_get_string_manufacture:
+	load_addr	$20, string_manufacture	/* data pointer */
+	b	_ep0_idle_state_fini
+	li	$21, 16			/* data length */
+
+___ep0_get_string_product:
+	load_addr	$20, string_product	/* data pointer */
+	b	_ep0_idle_state_fini
+	li	$21, 46			/* data length */
+
+_ep0_idle_state_fini:
+	li	$9, 0x40		/* SVDOUTPKTRDY */
+	beqz	$23, _ep0_idle_state_fini2
+	nop
+	ori	$9, $9, 0x08		/* DATAEND */
+_ep0_idle_state_fini2:
+	sb	$9, 0x12($27)		/* CSR0 */
+	beqz	$22, check_intr_ep1in
+	nop
+
+	/* 2.2 Handle EP0 TX state interrupt */
+ep0_tx_state:
+	sub	$9, $22, 1
+	bnez	$9, check_intr_ep1in
+	nop
+
+	sub	$9, $21, 64		/* max packetsize */
+	blez	$9, _ep0_tx_state2	/* data count <= 64 */
+	ori	$19, $21, 0
+	li	$19, 64
+
+_ep0_tx_state2:
+	beqz	$19, _ep0_tx_state3	/* send ZLP */
+	ori	$18, $19, 0		/* record bytes to be transferred */
+	sub	$21, $21, $19		/* decrement data count */
+
+_ep0_fifo_write_loop:
+	lbu	$9, 0($20)		/* read data */
+	sb	$9, 0x20($27)		/* load FIFO */
+	sub	$19, $19, 1		/* decrement counter */
+	bnez	$19, _ep0_fifo_write_loop
+	addi	$20, $20, 1		/* increment data pointer */
+
+	sub	$9, $18, 64		/* max packetsize */
+	beqz	$9, _ep0_tx_state4
+	nop
+
+_ep0_tx_state3:
+	/* transferred bytes < max packetsize */
+	li	$9, 0x0a		/* set INPKTRDY and DATAEND */
+	sb	$9, 0x12($27)		/* CSR0 */
+	li	$22, 0			/* set EP0 to IDLE state */
+	b	check_intr_ep1in
+	nop
+
+_ep0_tx_state4:
+	/* transferred bytes == max packetsize */
+	li	$9, 0x02		/* set INPKTRDY */
+	sb	$9, 0x12($27)		/* CSR0 */
+	b	check_intr_ep1in
+	nop
+
+	/* 3. Check and handle EP1 BULK-IN interrupt */
+check_intr_ep1in:
+	andi	$9, $10, 0x2		/* check EP1 IN interrupt */
+	beqz	$9, check_intr_ep1out
+	nop
+
+handle_epin1_intr:
+	li	$9, 1
+	sb	$9, 0x0e($27)		/* set INDEX 1 */
+	lbu	$9, 0x12($27)		/* read INCSR */
+
+	andi	$8, $9, 0x2		/* check INCSR_FFNOTEMPT */
+	bnez	$8, _epin1_tx_state4
+	nop
+
+_epin1_write_fifo:
+	lhu	$9, 0x10($27)		/* get INMAXP */
+	sub	$8, $21, $9
+	blez	$8, _epin1_tx_state1	/* bytes left <= INMAXP */
+	ori	$19, $21, 0
+	ori	$19, $9, 0
+
+_epin1_tx_state1:
+	beqz	$19, _epin1_tx_state4	/* No data */
+	nop
+
+	sub	$21, $21, $19		/* decrement data count */
+
+	srl	$5, $19, 2		/* # of word */
+	andi	$6, $19, 0x3		/* # of byte */
+	beqz	$5, _epin1_tx_state2
+	nop
+
+_epin1_fifo_write_word:
+	lw	$9, 0($20)		/* read data from source address */
+	sw	$9, 0x24($27)		/* write FIFO */
+	sub	$5, $5, 1		/* decrement counter */
+	bnez	$5, _epin1_fifo_write_word
+	addiu	$20, $20, 4		/* increment dest address */
+
+_epin1_tx_state2:
+	beqz	$6, _epin1_tx_state3
+	nop
+
+_epin1_fifo_write_byte:
+	lbu	$9, 0($20)		/* read data from source address */
+	sb	$9, 0x24($27)		/* write FIFO */
+	sub	$6, $6, 1		/* decrement counter */
+	bnez	$6, _epin1_fifo_write_byte
+	addiu	$20, $20, 1		/* increment dest address */
+
+_epin1_tx_state3:
+	li	$9, 0x1
+	sb	$9, 0x12($27)		/* INCSR, set INPKTRDY */
+
+_epin1_tx_state4:
+	/* 4. Check and handle EP1 BULK-OUT interrupt */
+check_intr_ep1out:
+	lhu	$9, 0x04($27)		/* read INTROUT */
+	andi	$9, 0x2
+	beqz	$9, check_status_next
+	nop
+
+handle_epout1_intr:
+	li	$9, 1
+	sb	$9, 0x0e($27)		/* set INDEX 1 */
+
+	lbu	$9, 0x16($27)		/* read OUTCSR */
+	andi	$9, 0x1			/* check OUTPKTRDY */
+	beqz	$9, check_status_next
+	nop
+
+_epout1_read_fifo:
+	lhu	$19, 0x18($27)		/* read OUTCOUNT */
+	srl	$5, $19, 2		/* # of word */
+	andi	$6, $19, 0x3		/* # of byte */
+	beqz	$5, _epout1_rx_state1
+	nop
+
+_epout1_fifo_read_word:
+	lw	$9, 0x24($27)		/* read FIFO */
+	sw	$9, 0($20)		/* store to dest address */
+	sub	$5, $5, 1		/* decrement counter */
+	bnez	$5, _epout1_fifo_read_word
+	addiu	$20, $20, 4		/* increment dest address */
+
+_epout1_rx_state1:
+	beqz	$6, _epout1_rx_state2
+	nop
+
+_epout1_fifo_read_byte:
+	lbu	$9, 0x24($27)		/* read FIFO */
+	sb	$9, 0($20)		/* store to dest address */
+	sub	$6, $6, 1		/* decrement counter */
+	bnez	$6, _epout1_fifo_read_byte
+	addiu	$20, $20, 1		/* increment dest address */
+
+_epout1_rx_state2:
+	sb	$0, 0x16($27)		/* clear OUTPKTRDY */
+
+check_status_next:
+	b	usb_command_loop
+	nop
+
+/* Device/Configuration/Interface/Endpoint/String Descriptors */
+
+	.align	2
+device_desc:
+	.byte	0x12		/* bLength */
+	.byte	0x01		/* bDescriptorType */
+	.byte	0x00		/* bcdUSB */
+	.byte	0x02		/* bcdUSB */
+	.byte	0x00		/* bDeviceClass */
+	.byte	0x00		/* bDeviceSubClass */
+	.byte	0x00		/* bDeviceProtocol */
+	.byte	0x40		/* bMaxPacketSize0 */
+	.byte	0x1a		/* idVendor */
+	.byte	0x60		/* idVendor */
+	.byte	0x40		/* idProduct */
+	.byte	0x47		/* idProduct */
+	.byte	0x00		/* bcdDevice */
+	.byte	0x01		/* bcdDevice */
+	.byte	0x01		/* iManufacturer */
+	.byte	0x02		/* iProduct */
+	.byte	0x00		/* iSerialNumber */
+	.byte	0x01		/* bNumConfigurations */
+
+	.align	2
+dev_qualifier:
+	.byte	0x0a		/* bLength */
+	.byte	0x06		/* bDescriptorType */
+	.byte	0x00		/* bcdUSB */
+	.byte	0x02		/* bcdUSB */
+	.byte	0x00		/* bDeviceClass */
+	.byte	0x00		/* bDeviceSubClass */
+	.byte	0x00		/* bDeviceProtocol */
+	.byte	0x40		/* bMaxPacketSize0 */
+	.byte	0x01		/* bNumConfigurations */
+	.byte	0x00		/* bRESERVED */
+
+	.align	2
+config_desc_hs:
+	.byte	0x09		/* bLength */
+	.byte	0x02		/* bDescriptorType */
+	.byte	0x20		/* wTotalLength */
+	.byte	0x00		/* wTotalLength */
+	.byte	0x01		/* bNumInterfaces */
+	.byte	0x01		/* bConfigurationValue */
+	.byte	0x00		/* iConfiguration */
+	.byte	0xc0		/* bmAttributes */
+	.byte	0x01		/* MaxPower */
+intf_desc_hs:
+	.byte	0x09		/* bLength */
+	.byte	0x04		/* bDescriptorType */
+	.byte	0x00		/* bInterfaceNumber */
+	.byte	0x00		/* bAlternateSetting */
+	.byte	0x02		/* bNumEndpoints */
+	.byte	0xff		/* bInterfaceClass */
+	.byte	0x00		/* bInterfaceSubClass */
+	.byte	0x50		/* bInterfaceProtocol */
+	.byte	0x00		/* iInterface */
+ep1_desc_hs:
+	.byte	0x07		/* bLength */
+	.byte	0x05		/* bDescriptorType */
+	.byte	0x01		/* bEndpointAddress */
+	.byte	0x02		/* bmAttributes */
+	.byte	0x00		/* wMaxPacketSize */
+	.byte	0x02		/* wMaxPacketSize */
+	.byte	0x00		/* bInterval */
+ep2_desc_hs:
+	.byte	0x07		/* bLength */
+	.byte	0x05		/* bDescriptorType */
+	.byte	0x81		/* bEndpointAddress */
+	.byte	0x02		/* bmAttributes */
+	.byte	0x00		/* wMaxPacketSize */
+	.byte	0x02		/* wMaxPacketSize */
+	.byte	0x00		/* bInterval */
+
+	.align	2
+config_desc_fs:
+	.byte	0x09		/* bLength */
+	.byte	0x02		/* bDescriptorType */
+	.byte	0x20		/* wTotalLength */
+	.byte	0x00		/* wTotalLength */
+	.byte	0x01		/* bNumInterfaces */
+	.byte	0x01		/* bConfigurationValue */
+	.byte	0x00		/* iConfiguration */
+	.byte	0xc0		/* bmAttributes */
+	.byte	0x01		/* MaxPower */
+intf_desc_fs:
+	.byte	0x09		/* bLength */
+	.byte	0x04		/* bDescriptorType */
+	.byte	0x00		/* bInterfaceNumber */
+	.byte	0x00		/* bAlternateSetting */
+	.byte	0x02		/* bNumEndpoints */
+	.byte	0xff		/* bInterfaceClass */
+	.byte	0x00		/* bInterfaceSubClass */
+	.byte	0x50		/* bInterfaceProtocol */
+	.byte	0x00		/* iInterface */
+ep1_desc_fs:
+	.byte	0x07		/* bLength */
+	.byte	0x05		/* bDescriptorType */
+	.byte	0x01		/* bEndpointAddress */
+	.byte	0x02		/* bmAttributes */
+	.byte	0x40		/* wMaxPacketSize */
+	.byte	0x00		/* wMaxPacketSize */
+	.byte	0x00		/* bInterval */
+ep2_desc_fs:
+	.byte	0x07		/* bLength */
+	.byte	0x05		/* bDescriptorType */
+	.byte	0x81		/* bEndpointAddress */
+	.byte	0x02		/* bmAttributes */
+	.byte	0x40		/* wMaxPacketSize */
+	.byte	0x00		/* wMaxPacketSize */
+	.byte	0x00		/* bInterval */
+
+	.align	2
+string_lang_ids:
+	.byte	0x04
+	.byte	0x03
+	.byte	0x09
+	.byte	0x04
+
+	.align	2
+string_manufacture:
+	.byte	0x10
+	.byte	0x03
+	.byte	0x49
+	.byte	0x00
+	.byte	0x6e
+	.byte	0x00
+	.byte	0x67
+	.byte	0x00
+	.byte	0x65
+	.byte	0x00
+	.byte	0x6e
+	.byte	0x00
+	.byte	0x69
+	.byte	0x00
+	.byte	0x63
+	.byte	0x00
+
+	.align	2
+string_product:
+	.byte	0x2e
+	.byte	0x03
+	.byte	0x4a
+	.byte	0x00
+	.byte	0x5a
+	.byte	0x00
+	.byte	0x34
+	.byte	0x00
+	.byte	0x37
+	.byte	0x00
+	.byte	0x34
+	.byte	0x00
+	.byte	0x30
+	.byte	0x00
+	.byte	0x20
+	.byte	0x00
+	.byte	0x55
+	.byte	0x00
+	.byte	0x53
+	.byte	0x00
+	.byte	0x42
+	.byte	0x00
+	.byte	0x20
+	.byte	0x00
+	.byte	0x42
+	.byte	0x00
+	.byte	0x6f
+	.byte	0x00
+	.byte	0x6f
+	.byte	0x00
+	.byte	0x74
+	.byte	0x00
+	.byte	0x20
+	.byte	0x00
+	.byte	0x44
+	.byte	0x00
+	.byte	0x65
+	.byte	0x00
+	.byte	0x76
+	.byte	0x00
+	.byte	0x69
+	.byte	0x00
+	.byte	0x63
+	.byte	0x00
+	.byte	0x65
+	.byte	0x00
+
+	.align	2
+cpu_info_data:
+	.byte	0x4a
+	.byte	0x5a
+	.byte	0x34
+	.byte	0x37
+	.byte	0x34
+	.byte	0x30
+	.byte	0x56
+	.byte	0x31
+usbboot_end:
+
+    .set reorder