mini/gecko.c
2010-06-26 11:28:13 +02:00

390 lines
7.0 KiB
C

/*
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
USBGecko support code
Copyright (c) 2008 Nuke - <wiinuke@gmail.com>
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
Copyright (C) 2008, 2009 Sven Peter <svenpeter@gmail.com>
Copyright (C) 2009 Andre Heider "dhewg" <dhewg@wiibrew.org>
# This code is licensed to you under the terms of the GNU GPL, version 2;
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/
#include "types.h"
#include "irq.h"
#include "start.h"
#include "vsprintf.h"
#include "string.h"
#include "utils.h"
#include "hollywood.h"
#include "elf.h"
#include "powerpc.h"
#include "powerpc_elf.h"
#include "gecko.h"
//#define GECKO_LFCR
//#define GECKO_SAFE
static u8 gecko_console_enabled = 0;
static u32 _gecko_command(u32 command)
{
u32 i;
// Memory Card Port B (Channel 1, Device 0, Frequency 3 (32Mhz Clock))
write32(EXI1_CSR, 0xd0);
write32(EXI1_DATA, command);
write32(EXI1_CR, 0x19);
while (read32(EXI1_CR) & 1);
i = read32(EXI1_DATA);
write32(EXI1_CSR, 0);
return i;
}
static u32 _gecko_getid(void)
{
u32 i;
// Memory Card Port B (Channel 1, Device 0, Frequency 3 (32Mhz Clock))
write32(EXI1_CSR, 0xd0);
write32(EXI1_DATA, 0);
write32(EXI1_CR, 0x19);
while (read32(EXI1_CR) & 1);
write32(EXI1_CR, 0x39);
while (read32(EXI1_CR) & 1);
i = read32(EXI1_DATA);
write32(EXI1_CSR, 0);
return i;
}
static u32 _gecko_sendbyte(u8 sendbyte)
{
u32 i = 0;
i = _gecko_command(0xB0000000 | (sendbyte<<20));
if (i&0x04000000)
return 1; // Return 1 if byte was sent
return 0;
}
static u32 _gecko_recvbyte(u8 *recvbyte)
{
u32 i = 0;
*recvbyte = 0;
i = _gecko_command(0xA0000000);
if (i&0x08000000) {
// Return 1 if byte was received
*recvbyte = (i>>16)&0xff;
return 1;
}
return 0;
}
#ifdef GECKO_SAFE
static u32 _gecko_checksend(void)
{
u32 i = 0;
i = _gecko_command(0xC0000000);
if (i&0x04000000)
return 1; // Return 1 if safe to send
return 0;
}
#endif
static u32 _gecko_checkrecv(void)
{
u32 i = 0;
i = _gecko_command(0xD0000000);
if (i&0x04000000)
return 1; // Return 1 if safe to recv
return 0;
}
static int gecko_isalive(void)
{
u32 i;
i = _gecko_getid();
if (i != 0x00000000)
return 0;
i = _gecko_command(0x90000000);
if ((i & 0xFFFF0000) != 0x04700000)
return 0;
return 1;
}
static void gecko_flush(void)
{
u8 tmp;
while(_gecko_recvbyte(&tmp));
}
#if 0
static int gecko_recvbuffer(void *buffer, u32 size)
{
u32 left = size;
char *ptr = (char*)buffer;
while(left>0) {
if(!_gecko_recvbyte(ptr))
break;
ptr++;
left--;
}
return (size - left);
}
#endif
#ifndef GECKO_SAFE
static int gecko_sendbuffer(const void *buffer, u32 size)
{
u32 left = size;
char *ptr = (char*)buffer;
while(left>0) {
if(!_gecko_sendbyte(*ptr))
break;
if(*ptr == '\n') {
#ifdef GECKO_LFCR
_gecko_sendbyte('\r');
#endif
break;
}
ptr++;
left--;
}
return (size - left);
}
#endif
#if 0
static int gecko_recvbuffer_safe(void *buffer, u32 size)
{
u32 left = size;
char *ptr = (char*)buffer;
while(left>0) {
if(_gecko_checkrecv()) {
if(!_gecko_recvbyte(ptr))
break;
ptr++;
left--;
}
}
return (size - left);
}
#endif
#ifdef GECKO_SAFE
static int gecko_sendbuffer_safe(const void *buffer, u32 size)
{
u32 left = size;
char *ptr = (char*)buffer;
if((read32(HW_EXICTRL) & EXICTRL_ENABLE_EXI) == 0)
return left;
while(left>0) {
if(_gecko_checksend()) {
if(!_gecko_sendbyte(*ptr))
break;
if(*ptr == '\n') {
#ifdef GECKO_LFCR
_gecko_sendbyte('\r');
#endif
break;
}
ptr++;
left--;
}
}
return (size - left);
}
#endif
void gecko_init(void)
{
write32(EXI0_CSR, 0);
write32(EXI1_CSR, 0);
write32(EXI2_CSR, 0);
write32(EXI0_CSR, 0x2000);
write32(EXI0_CSR, 3<<10);
write32(EXI1_CSR, 3<<10);
if (!gecko_isalive())
return;
gecko_flush();
gecko_console_enabled = 1;
}
u8 gecko_enable_console(const u8 enable)
{
if (enable) {
if (gecko_isalive())
gecko_console_enabled = 1;
} else
gecko_console_enabled = 0;
return gecko_console_enabled;
}
#ifndef NDEBUG
int gecko_printf(const char *fmt, ...)
{
if (!gecko_console_enabled)
return 0;
va_list args;
char buffer[256];
int i;
va_start(args, fmt);
i = vsprintf(buffer, fmt, args);
va_end(args);
#ifdef GECKO_SAFE
return gecko_sendbuffer_safe(buffer, i);
#else
return gecko_sendbuffer(buffer, i);
#endif
}
#endif
// irq context
#define GECKO_STATE_NONE 0
#define GECKO_STATE_RECEIVE_BUFFER_SIZE 1
#define GECKO_STATE_RECEIVE_BUFFER 2
#define GECKO_BUFFER_MAX (20 * 1024 * 1024)
#define GECKO_CMD_BIN_ARM 0x4241524d
#define GECKO_CMD_BIN_PPC 0x42505043
static u32 _gecko_cmd = 0;
static u32 _gecko_cmd_start_time = 0;
static u32 _gecko_state = GECKO_STATE_NONE;
static u32 _gecko_receive_left = 0;
static u32 _gecko_receive_len = 0;
static u8 *_gecko_receive_buffer = NULL;
void gecko_timer_initialize(void)
{
if (!gecko_isalive())
return;
irq_set_alarm(20, 1);
}
void gecko_timer(void) {
u8 b;
if (_gecko_cmd_start_time && read32(HW_TIMER) >
(_gecko_cmd_start_time + IRQ_ALARM_MS2REG(5000)))
goto cleanup;
switch (_gecko_state) {
case GECKO_STATE_NONE:
if (!_gecko_checkrecv() || !_gecko_recvbyte(&b))
return;
_gecko_cmd <<= 8;
_gecko_cmd |= b;
switch (_gecko_cmd) {
case GECKO_CMD_BIN_ARM:
_gecko_state = GECKO_STATE_RECEIVE_BUFFER_SIZE;
_gecko_receive_len = 0;
_gecko_receive_left = 4;
_gecko_receive_buffer = (u8 *) 0x0; // yarly
_gecko_cmd_start_time = read32(HW_TIMER);
break;
case GECKO_CMD_BIN_PPC:
_gecko_state = GECKO_STATE_RECEIVE_BUFFER_SIZE;
_gecko_receive_len = 0;
_gecko_receive_left = 4;
_gecko_receive_buffer = (u8 *) 0x10100000;
_gecko_cmd_start_time = read32(HW_TIMER);
break;
}
return;
case GECKO_STATE_RECEIVE_BUFFER_SIZE:
if (!_gecko_checkrecv() || !_gecko_recvbyte(&b))
return;
_gecko_receive_len <<= 8;
_gecko_receive_len |= b;
_gecko_receive_left--;
if (!_gecko_receive_left) {
if (_gecko_receive_len > GECKO_BUFFER_MAX)
goto cleanup;
_gecko_state = GECKO_STATE_RECEIVE_BUFFER;
_gecko_receive_left = _gecko_receive_len;
// sorry pal, that memory is mine now
powerpc_hang();
}
return;
case GECKO_STATE_RECEIVE_BUFFER:
while (_gecko_receive_left) {
if (!_gecko_checkrecv() || !_gecko_recvbyte(_gecko_receive_buffer))
return;
_gecko_receive_buffer++;
_gecko_receive_left--;
}
if (!_gecko_receive_left)
break;
return;
default:
gecko_printf("MINI/GECKO: internal error\n");
return;
}
ioshdr *h;
// done receiving, handle the command
switch (_gecko_cmd) {
case GECKO_CMD_BIN_ARM:
h = (ioshdr *) (u32 *) 0x0;
if (h->hdrsize != sizeof (ioshdr))
goto cleanup;
if (memcmp("\x7F" "ELF\x01\x02\x01",
(void *) (h->hdrsize + h->loadersize), 7))
goto cleanup;
ipc_enqueue_slow(IPC_DEV_SYS, IPC_SYS_JUMP, 1, h->hdrsize);
break;
case GECKO_CMD_BIN_PPC:
ipc_enqueue_slow(IPC_DEV_PPC, IPC_PPC_BOOT, 3,
1, (u32) 0x10100000, _gecko_receive_len);
break;
}
cleanup:
gecko_flush();
_gecko_cmd = 0;
_gecko_cmd_start_time = 0;
_gecko_state = GECKO_STATE_NONE;
}