mirror of
https://github.com/torvalds/linux.git
synced 2024-12-23 11:21:33 +00:00
698cd335a7
The retry logic in ug_putc() is broken. If the TX fifo is not ready and the counter runs out it will have a value of -1 and no transfer should be attempted. Also, a counter with a value of 0 means that the TX fifo got ready in the last try and the transfer should be attempted. Reported-by: "Juha Leppanen" <juha_motorsportcom@luukku.com> Signed-off-by: "Juha Leppanen" <juha_motorsportcom@luukku.com> Signed-off-by: Albert Herranz <albert_herranz@yahoo.es> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
148 lines
2.8 KiB
C
148 lines
2.8 KiB
C
/*
|
|
* 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 >= 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;
|
|
}
|
|
|