[RFC PATCH v2 01/11] powerpc: gamecube/wii: usbgecko bootwrapper console support
Segher Boessenkool
segher at kernel.crashing.org
Wed Dec 2 05:28:35 EST 2009
> 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: Albert Herranz <albert_herranz at yahoo.es>
Acked-by: Segher Boessenkool <segher at kernel.crashing.org>
> ---
> v1 -> v2
> - Probe dinamically for usbgecko. Suggestion by Segher Boessenkool.
> - Adapt to updated device tree.
>
> arch/powerpc/boot/Makefile | 2 +-
> arch/powerpc/boot/ugecon.c | 147 +++++++++++++++++++++++++++++++++
> +++++++++++
> arch/powerpc/boot/ugecon.h | 24 +++++++
> 3 files changed, 172 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..50609ea
> --- /dev/null
> +++ b/arch/powerpc/boot/ugecon.c
> @@ -0,0 +1,147 @@
> +/*
> + * 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;
> +}
> +
> diff --git a/arch/powerpc/boot/ugecon.h b/arch/powerpc/boot/ugecon.h
> new file mode 100644
> index 0000000..4373753
> --- /dev/null
> +++ b/arch/powerpc/boot/ugecon.h
> @@ -0,0 +1,24 @@
> +/*
> + * 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 */
> +
> --
> 1.6.3.3
>
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