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/*
* Copyright (c) 2015 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* Based on a patch by:
*
* Copyright (C) 2011 Rick Bronson
*
* 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 version 2
* as published by the Free Software Foundation.
*
* 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.
*
*/
#include <common.h>
#include <io.h>
#include <malloc.h>
#include <mach/omap3-silicon.h>
#include <mach/omap3-generic.h>
static void __iomem *omap3_usb_base = (void __iomem *)OMAP3_MUSB0_BASE;
#define OMAP34XX_USB_EP(n) (omap3_usb_base + 0x100 + 0x10 * (n))
#define MUSB_RXCSR 0x06
#define MUSB_RXCOUNT 0x08
#define MUSB_TXCSR 0x02
#define MUSB_FIFOSIZE 0x0F
#define OMAP34XX_USB_RXCSR(n) (OMAP34XX_USB_EP(n) + MUSB_RXCSR)
#define OMAP34XX_USB_RXCOUNT(n) (OMAP34XX_USB_EP(n) + MUSB_RXCOUNT)
#define OMAP34XX_USB_TXCSR(n) (OMAP34XX_USB_EP(n) + MUSB_TXCSR)
#define OMAP34XX_USB_FIFOSIZE(n) (OMAP34XX_USB_EP(n) + MUSB_FIFOSIZE)
#define OMAP34XX_USB_FIFO(n) (omap3_usb_base + 0x20 + ((n) * 4))
/* memory mapped registers */
#define BULK_ENDPOINT 1
#define MUSB_RXCSR_RXPKTRDY 0x0001
#define MUSB_TXCSR_TXPKTRDY 0x0001
#define PACK4(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
#define USBLOAD_CMD_FILE PACK4('U', 'S', 'B', 's') /* send file size */
#define USBLOAD_CMD_JUMP PACK4('U', 'S', 'B', 'j') /* go where I tell you */
#define USBLOAD_CMD_FILE_REQ PACK4('U', 'S', 'B', 'f') /* file request */
#define USBLOAD_CMD_ECHO_SZ PACK4('U', 'S', 'B', 'n') /* echo file size */
#define USBLOAD_CMD_REPORT_SZ PACK4('U', 'S', 'B', 'o') /* report file size */
#define USBLOAD_CMD_MESSAGE PACK4('U', 'S', 'B', 'm') /* message for debug */
static int usb_send(unsigned char *buffer, unsigned int buffer_size)
{
unsigned int cntr;
u16 txcsr;
void __iomem *reg = (void *)OMAP34XX_USB_TXCSR(BULK_ENDPOINT);
void __iomem *bulk_fifo = (void *)OMAP34XX_USB_FIFO(BULK_ENDPOINT);
txcsr = readw(reg);
if (txcsr & MUSB_TXCSR_TXPKTRDY)
return 0;
for (cntr = 0; cntr < buffer_size; cntr++)
writeb(buffer[cntr], bulk_fifo);
txcsr = readw(reg);
txcsr |= MUSB_TXCSR_TXPKTRDY;
writew(txcsr, reg);
return buffer_size;
}
static int usb_recv(u8 *buffer)
{
int cntr;
u16 count = 0;
u16 rxcsr;
void __iomem *reg = (void *)OMAP34XX_USB_RXCSR(BULK_ENDPOINT);
void __iomem *bulk_fifo = (void *)OMAP34XX_USB_FIFO(BULK_ENDPOINT);
rxcsr = readw(reg);
if (!(rxcsr & MUSB_RXCSR_RXPKTRDY))
return 0;
count = readw((void *)OMAP34XX_USB_RXCOUNT(BULK_ENDPOINT));
for (cntr = 0; cntr < count; cntr++)
*buffer++ = readb(bulk_fifo);
/* Clear the RXPKTRDY bit */
rxcsr = readw(reg);
rxcsr &= ~MUSB_RXCSR_RXPKTRDY;
writew(rxcsr, reg);
return count;
}
static unsigned char usb_outbuffer[64];
static void usb_msg(unsigned int cmd, const char *msg)
{
unsigned char *p_char = usb_outbuffer;
*(int *)p_char = cmd;
p_char += sizeof(cmd);
if (msg) {
while (*msg)
*p_char++= *msg++;
*p_char++= 0;
}
usb_send(usb_outbuffer, p_char - usb_outbuffer);
}
static void usb_code(unsigned int cmd, u32 code)
{
unsigned int *p_int = (unsigned int *)usb_outbuffer;
*p_int++ = cmd;
*p_int++ = code;
usb_send (usb_outbuffer, ((unsigned char *) p_int) - usb_outbuffer);
}
void *omap3_xload_boot_usb(void)
{
int res;
void *buf;
u32 *buf32;
u32 total;
void *addr;
u32 bytes;
int size;
int cntr;
void *fn;
u8 __buf[512];
buf32 = buf = __buf;
usb_msg (USBLOAD_CMD_FILE_REQ, "file req");
for (cntr = 0; cntr < 10000000; cntr++) {
size = usb_recv(buf);
if (!size)
continue;
switch (buf32[0]) {
case USBLOAD_CMD_FILE:
pr_debug ("USBLOAD_CMD_FILE total = %d size = 0x%x addr = 0x%x\n",
res, buf32[1], buf32[2]);
total = buf32[1]; /* get size and address */
addr = (void *)buf32[2];
usb_code(USBLOAD_CMD_ECHO_SZ, total);
bytes = 0;
while (bytes < total) {
size = usb_recv(buf);
memcpy(addr, buf, size);
addr += size;
bytes += size;
}
usb_code(USBLOAD_CMD_REPORT_SZ, total); /* tell him we got this many bytes */
usb_msg (USBLOAD_CMD_FILE_REQ, "file req"); /* see if they have another file for us */
break;
case USBLOAD_CMD_JUMP:
pr_debug("USBLOAD_CMD_JUMP total = %d addr = 0x%x val = 0x%x\n",
res, buf32[0], buf32[1]);
fn = (void *)buf32[1];
goto out;
default:
break;
}
}
fn = NULL;
out:
return fn;
}
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