Subject: Re: [RFC PATCH 01/19] powerpc: gamecube/wii: usbgecko bootwrapper console support

From: Benjamin Herrenschmidt <[email-masked]>
Date: Thu, 26 Nov 2009 15:12:31 +1100

On Sun, 2009-11-22 at 23:01 +0100, Albert Herranz wrote:
> 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.

Looks good. Not sure yet when I'll merge these, I might wait a bit for
the dust to settle but I may also just stick some of the simple/obvious
patches in early like this one to make things easier.

Cheers,
Ben.

> Signed-off-by: Albert Herranz <[email-masked]>
> ---
>  arch/powerpc/boot/Makefile |    2 +-
>  arch/powerpc/boot/ugecon.c |  128 ++++++++++++++++++++++++++++++++++++++++++++
>  arch/powerpc/boot/ugecon.h |   25 +++++++++
>  3 files changed, 154 insertions(+), 1 deletions(-)
>  create mode 100644 arch/powerpc/boot/ugecon.c
>  create mode 100644 arch/powerpc/boot/ugecon.h
> 
> diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
> index 7bfc8ad..44bce21 100644
> --- a/arch/powerpc/boot/Makefile
> +++ b/arch/powerpc/boot/Makefile
> @@ -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 \
> diff --git a/arch/powerpc/boot/ugecon.c b/arch/powerpc/boot/ugecon.c
> new file mode 100644
> index 0000000..704f374
> --- /dev/null
> +++ b/arch/powerpc/boot/ugecon.c
> @@ -0,0 +1,128 @@
> +/*
> + * 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++);
> +	}
> +}
> +
> +int ug_is_adapter_present(void)
> +{
> +	if (!ug_io_base)
> +		return 0;
> +
> +	return ug_io_transaction(0x90000000) == 0x04700000;
> +}
> +
> +int ug_grab_io_base(void)
> +{
> +	u32 v;
> +	void *devp;
> +
> +	devp = find_node_by_alias("ugecon");
> +	if (devp == NULL)
> +		goto err_out;
> +	if (getprop(devp, "virtual-reg", &v, sizeof(v)) != sizeof(v))
> +		goto err_out;
> +
> +	ug_io_base = (u8 *)v;
> +	return 0;
> +
> +err_out:
> +	return -1;
> +}
> diff --git a/arch/powerpc/boot/ugecon.h b/arch/powerpc/boot/ugecon.h
> new file mode 100644
> index 0000000..1fdb590
> --- /dev/null
> +++ b/arch/powerpc/boot/ugecon.h
> @@ -0,0 +1,25 @@
> +/*
> + * 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 int ug_grab_io_base(void);
> +extern int ug_is_adapter_present(void);
> +
> +extern void ug_putc(char ch);
> +extern void ug_console_write(const char *buf, int len);
> +
> +#endif /* __UGECON_H */
> +