source: tt-loader/2nd/main.c @ 11

/*
 * 2nd - OMAP "second stage" tt-loader
 *
 * Copyright (C) 2008 Guillaume Bougard <gbougard@pkg.fr>
 * Copyright (C) 2005 Luis Recuerda <lrec@helios.homeip.net>
 *
 * 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.
 *
 */

#include "config.h"
#include "usb.h"

#define _LSR_   ((volatile u8 *) 0xfffb0014)
#define _THR_   ((volatile u8 *) 0xfffb0000)
#define _RHR_   ((volatile u8 *) 0xfffb0000)

#define MEM_READ_SIZE   32

static char *usb_hdr = "TIS" ;
static char usb_outbuffer[64];

// limited strcpy
static u32 strcpy ( char *dest, char *src )
{
        u32 count = 0 ;
        char *tmp = dest, *s = src;
        
        while ( ++count < 256 && *s != '\0' )
                *tmp++ = *s++ ;
        
        *tmp = '\0' ;
        
        return count ;
}

static u32 memcpy ( char *dest, char *src, u32 count )
{
        char *tmp = dest, *s = src;
        u32 step = count ;

        while (step--)
                *tmp++ = *s++;
        
        return count ;
}

static void bsend (char ch)
{
        while (!((*_LSR_) & 0x20));
        *_THR_= ch;
}

static inline int check_serial (void) { return (*_LSR_) & 0x01; }

static char brecv (void)
{
        while (!((*_LSR_) & 0x01));
        return *_RHR_;
}

char crecv (void)
{
        return brecv ();
}

void csend (char ch)
{
        if (ch == '\n')
                bsend ('\r');
        bsend (ch);
}

void tsend (const char *text)
{
        while (*text)
                csend (*text++);
}

void xsend (unsigned value)
{
        if (value < 10)
                bsend (value + '0');
        else
                bsend (value + ('A'-10));
}

void x8send (u8 value)
{
        xsend (value >> 4);
        xsend (value & 0xf);
}

void x16send (u16 value)
{
        int     i;
        for (i= 0; i < 4; ++i)
        {
                xsend (value >> 12);
                value<<= 4;
        }
}

void x32send (u32 value)
{
        int     i;
        for (i= 0; i < 8; ++i)
        {
                xsend (value >> 28);
                value<<= 4;
        }
}

static void usb_msg (const char cmd, const char *msg)
{
        u32 len = strcpy(usb_outbuffer,usb_hdr);
        usb_outbuffer[len-1] = cmd ;
        
        len += strcpy(&usb_outbuffer[len], msg ? (char *)msg : "" );

        usb_send ( usb_outbuffer, len);
        while (!usb_sent ());
}

static u32 usb_code (char cmd, u32 code)
{
        u32 len = strcpy(usb_outbuffer,usb_hdr);
        usb_outbuffer[len-1] = cmd ;
        (*(u32 *)(usb_outbuffer+len)) = code ;
        len += sizeof(u32);

        usb_send ( usb_outbuffer, len );
        while (!usb_sent ());
        return code ;
}

static void usb_blk (const char cmd, char *mem, u32 size)
{
        u32 len = strcpy(usb_outbuffer,usb_hdr);
        usb_outbuffer[len-1] = cmd ;

        len += memcpy(usb_outbuffer+len,mem,size);
        
        usb_send ( usb_outbuffer, len );
        while (!usb_sent ());
}

// Code from linux-2.6.24.3/arch/arm/mach-omap1/id.c source
static u16 omap_get_jtag_id(void)
{
        u32 prod_id, jtag_id;

        prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
        jtag_id = omap_readl(OMAP32_ID_1);
        
        /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
        if (((prod_id >> 20) == 0) || (prod_id == jtag_id))
                prod_id = 0;
        else
                prod_id &= 0xffff;

        if (prod_id)
                return prod_id;

        /* Use OMAP32_ID_1 as fallback */
        prod_id = ((jtag_id >> 12) & 0xffff);

        return prod_id;
}

u32 _main (void)
{       
        u32 address = CFG_LOADADDR ;
        usb_msg ('m', "In omap plateform");
        
        u16 prod_id = omap_get_jtag_id();
        switch (prod_id)
        {
                case 0xb55f:
                        usb_msg ('m', "Found supported omap730");
                        break;
                default:
                        usb_msg ('m', "Unsupported plateform found");
                        usb_code ('v', (u32) prod_id);
                        break;
        }
        
        // Ready to manage requests
        usb_msg ('r', "Waiting first request");
        
        for (;;)
        {
                u32 total, cmd, index = 0 ;
                
                u8 usb_inbuffer[64];
                usb_recv (usb_inbuffer, sizeof (usb_inbuffer));
                while (!usb_rcvd ());
                
                // Check we are knowing the provided header
                while ( usb_inbuffer[index] == (u8) usb_hdr[index] && usb_hdr[index] != '\0' )
                        index++ ;
                
                if ( usb_hdr[index] != '\0' )
                        continue ;
                
                cmd = usb_inbuffer[index++] ;
                
                if ((char)cmd == 's') // Ask size to upload
                {
                        total= *(u32 *) &usb_inbuffer[index];
                        u32 size = 0;

                        usb_code ('n', total);

                        while (size < total)
                        {
                                u32     r;
                                
                                usb_recv ((u8 *)address, sizeof (usb_inbuffer));
                                while ((r= usb_rcvd ()) == 0);
                                                                
                                address += r ;
                                size += r ;
                        }
                        
                        usb_code ('o', size);
                        
                } else
                if ((char)cmd == 'f') // load file ACK
                {
                        usb_msg ('f', (const char *)&usb_inbuffer[index]);
                        
                } else
                if ((char)cmd == 'M') // dump memory command
                {
                        usb_blk ('M', (char *)address, MEM_READ_SIZE);
                        address += MEM_READ_SIZE ;
                        
                } else
                if ((char)cmd == 'a') // set address command
                {
                        address = *(u32 *) &usb_inbuffer[index];
                        usb_code ('i', address);
                        
                } else
                if ((char)cmd == 'c') // call command
                {
                        index = ((u32_fnc_t *)address)();
                        usb_code ('i', index);
                        
                } else
                if ((char)cmd == 'b') // boot command
                {
                        usb_code ('b', address );
                        // Just return the address where is store the branch to do
                        u32 bootaddress = (u32) &address ; // Convert/cast address just to avoid gcc warning
                        return bootaddress ;
                }
        }
}