mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
142 lines
2.6 KiB
142 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* arch/powerpc/boot/ugecon.c |
|
* |
|
* USB Gecko bootwrapper console. |
|
* Copyright (C) 2008-2009 The GameCube Linux Team |
|
* Copyright (C) 2008,2009 Albert Herranz |
|
*/ |
|
|
|
#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 >= 0) |
|
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; |
|
} |
|
|
|
|