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Commit 26054c95 authored by Albert Herranz's avatar Albert Herranz Committed by Grant Likely
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powerpc: gamecube/wii: usbgecko bootwrapper console support 



Add support for using the USB Gecko adapter as a bootwrapper console on
the Nintendo GameCube and Wii video game consoles.
The USB Gecko is a 3rd party memory card interface adapter that provides
a EXI (External Interface) to USB serial converter.

Signed-off-by: default avatarAlbert Herranz <albert_herranz@yahoo.es>
Acked-by: default avatarSegher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 22763c5c

arch/powerpc/boot/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -66,7 +66,7 @@ src-wlib := string.S crt0.S crtsavres.S stdio.c main.c \ 
		gunzip_util.c elf_util.c $(zlib) devtree.c oflib.c ofconsole.c \

		4xx.c ebony.c mv64x60.c mpsc.c mv64x60_i2c.c cuboot.c bamboo.c \

		cpm-serial.c stdlib.c mpc52xx-psc.c planetcore.c uartlite.c \

		fsl-soc.c mpc8xx.c pq2.c

		fsl-soc.c mpc8xx.c pq2.c ugecon.c

src-plat := of.c cuboot-52xx.c cuboot-824x.c cuboot-83xx.c cuboot-85xx.c holly.c \

		cuboot-ebony.c cuboot-hotfoot.c treeboot-ebony.c prpmc2800.c \

		ps3-head.S ps3-hvcall.S ps3.c treeboot-bamboo.c cuboot-8xx.c \

arch/powerpc/boot/ugecon.c

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+147 −0
Original line number Diff line number Diff line 
/*

 * arch/powerpc/boot/ugecon.c

 *

 * USB Gecko bootwrapper console.

 * Copyright (C) 2008-2009 The GameCube Linux Team

 * Copyright (C) 2008,2009 Albert Herranz

 *

 * 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.

 *

 */



#include <stddef.h>

#include "stdio.h"

#include "types.h"

#include "io.h"

#include "ops.h"





#define EXI_CLK_32MHZ           5



#define EXI_CSR                 0x00

#define   EXI_CSR_CLKMASK       (0x7<<4)

#define     EXI_CSR_CLK_32MHZ   (EXI_CLK_32MHZ<<4)

#define   EXI_CSR_CSMASK        (0x7<<7)

#define     EXI_CSR_CS_0        (0x1<<7)  /* Chip Select 001 */



#define EXI_CR                  0x0c

#define   EXI_CR_TSTART         (1<<0)

#define   EXI_CR_WRITE		(1<<2)

#define   EXI_CR_READ_WRITE     (2<<2)

#define   EXI_CR_TLEN(len)      (((len)-1)<<4)



#define EXI_DATA                0x10





/* virtual address base for input/output, retrieved from device tree */

static void *ug_io_base;





static u32 ug_io_transaction(u32 in)

{

	u32 *csr_reg = ug_io_base + EXI_CSR;

	u32 *data_reg = ug_io_base + EXI_DATA;

	u32 *cr_reg = ug_io_base + EXI_CR;

	u32 csr, data, cr;



	/* select */

	csr = EXI_CSR_CLK_32MHZ | EXI_CSR_CS_0;

	out_be32(csr_reg, csr);



	/* read/write */

	data = in;

	out_be32(data_reg, data);

	cr = EXI_CR_TLEN(2) | EXI_CR_READ_WRITE | EXI_CR_TSTART;

	out_be32(cr_reg, cr);



	while (in_be32(cr_reg) & EXI_CR_TSTART)

		barrier();



	/* deselect */

	out_be32(csr_reg, 0);



	data = in_be32(data_reg);

	return data;

}



static int ug_is_txfifo_ready(void)

{

	return ug_io_transaction(0xc0000000) & 0x04000000;

}



static void ug_raw_putc(char ch)

{

	ug_io_transaction(0xb0000000 | (ch << 20));

}



static void ug_putc(char ch)

{

	int count = 16;



	if (!ug_io_base)

		return;



	while (!ug_is_txfifo_ready() && count--)

		barrier();

	if (count)

		ug_raw_putc(ch);

}



void ug_console_write(const char *buf, int len)

{

	char *b = (char *)buf;



	while (len--) {

		if (*b == '\n')

			ug_putc('\r');

		ug_putc(*b++);

	}

}



static int ug_is_adapter_present(void)

{

	if (!ug_io_base)

		return 0;

	return ug_io_transaction(0x90000000) == 0x04700000;

}



static void *ug_grab_exi_io_base(void)

{

	u32 v;

	void *devp;



	devp = find_node_by_compatible(NULL, "nintendo,flipper-exi");

	if (devp == NULL)

		goto err_out;

	if (getprop(devp, "virtual-reg", &v, sizeof(v)) != sizeof(v))

		goto err_out;



	return (void *)v;



err_out:

	return NULL;

}



void *ug_probe(void)

{

	void *exi_io_base;

	int i;



	exi_io_base = ug_grab_exi_io_base();

	if (!exi_io_base)

		return NULL;



	/* look for a usbgecko on memcard slots A and B */

	for (i = 0; i < 2; i++) {

		ug_io_base = exi_io_base + 0x14 * i;

		if (ug_is_adapter_present())

			break;

	}

	if (i == 2)

		ug_io_base = NULL;

	return ug_io_base;

}

arch/powerpc/boot/ugecon.h

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Original line number Diff line number Diff line 
/*

 * arch/powerpc/boot/ugecon.h

 *

 * USB Gecko early bootwrapper console.

 * Copyright (C) 2008-2009 The GameCube Linux Team

 * Copyright (C) 2008,2009 Albert Herranz

 *

 * 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.

 *

 */



#ifndef __UGECON_H

#define __UGECON_H



extern void *ug_probe(void);



extern void ug_putc(char ch);

extern void ug_console_write(const char *buf, int len);



#endif /* __UGECON_H */