powerpc: gamecube/wii: udbg support for usbgecko
Add support for using the USB Gecko adapter via the udbg facility 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@yahoo.es> Acked-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Albert Herranz
Grant Likely
parent
bcc48591f5
commit
a166df0824
@ -94,3 +94,16 @@ config MPC10X_STORE_GATHERING
|
||||
config GAMECUBE_COMMON
|
||||
bool
|
||||
|
||||
config USBGECKO_UDBG
|
||||
bool "USB Gecko udbg console for the Nintendo GameCube/Wii"
|
||||
depends on GAMECUBE_COMMON
|
||||
help
|
||||
If you say yes to this option, support will be included for the
|
||||
USB Gecko adapter as an udbg console.
|
||||
The USB Gecko is a EXI to USB Serial converter that can be plugged
|
||||
into a memcard slot in the Nintendo GameCube/Wii.
|
||||
|
||||
This driver bypasses the EXI layer completely.
|
||||
|
||||
If in doubt, say N here.
|
||||
|
||||
|
||||
@ -7,3 +7,4 @@ obj-$(CONFIG_STORCENTER) += storcenter.o
|
||||
obj-$(CONFIG_PPC_HOLLY) += holly.o
|
||||
obj-$(CONFIG_PPC_PRPMC2800) += prpmc2800.o
|
||||
obj-$(CONFIG_PPC_C2K) += c2k.o
|
||||
obj-$(CONFIG_USBGECKO_UDBG) += usbgecko_udbg.o
|
||||
|
||||
272
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
Normal file
272
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
Normal file
@ -0,0 +1,272 @@
|
||||
/*
|
||||
* arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
|
||||
*
|
||||
* udbg serial input/output routines for the USB Gecko adapter.
|
||||
* 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 <mm/mmu_decl.h>
|
||||
|
||||
#include <asm/io.h>
|
||||
#include <asm/prom.h>
|
||||
#include <asm/udbg.h>
|
||||
|
||||
#include "usbgecko_udbg.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
|
||||
|
||||
#define UG_READ_ATTEMPTS 100
|
||||
#define UG_WRITE_ATTEMPTS 100
|
||||
|
||||
|
||||
static void __iomem *ug_io_base;
|
||||
|
||||
/*
|
||||
* Performs one input/output transaction between the exi host and the usbgecko.
|
||||
*/
|
||||
static u32 ug_io_transaction(u32 in)
|
||||
{
|
||||
u32 __iomem *csr_reg = ug_io_base + EXI_CSR;
|
||||
u32 __iomem *data_reg = ug_io_base + EXI_DATA;
|
||||
u32 __iomem *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);
|
||||
|
||||
/* result */
|
||||
data = in_be32(data_reg);
|
||||
|
||||
return data;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns true if an usbgecko adapter is found.
|
||||
*/
|
||||
static int ug_is_adapter_present(void)
|
||||
{
|
||||
if (!ug_io_base)
|
||||
return 0;
|
||||
|
||||
return ug_io_transaction(0x90000000) == 0x04700000;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns true if the TX fifo is ready for transmission.
|
||||
*/
|
||||
static int ug_is_txfifo_ready(void)
|
||||
{
|
||||
return ug_io_transaction(0xc0000000) & 0x04000000;
|
||||
}
|
||||
|
||||
/*
|
||||
* Tries to transmit a character.
|
||||
* If the TX fifo is not ready the result is undefined.
|
||||
*/
|
||||
static void ug_raw_putc(char ch)
|
||||
{
|
||||
ug_io_transaction(0xb0000000 | (ch << 20));
|
||||
}
|
||||
|
||||
/*
|
||||
* Transmits a character.
|
||||
* It silently fails if the TX fifo is not ready after a number of retries.
|
||||
*/
|
||||
static void ug_putc(char ch)
|
||||
{
|
||||
int count = UG_WRITE_ATTEMPTS;
|
||||
|
||||
if (!ug_io_base)
|
||||
return;
|
||||
|
||||
if (ch == '\n')
|
||||
ug_putc('\r');
|
||||
|
||||
while (!ug_is_txfifo_ready() && count--)
|
||||
barrier();
|
||||
if (count)
|
||||
ug_raw_putc(ch);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns true if the RX fifo is ready for transmission.
|
||||
*/
|
||||
static int ug_is_rxfifo_ready(void)
|
||||
{
|
||||
return ug_io_transaction(0xd0000000) & 0x04000000;
|
||||
}
|
||||
|
||||
/*
|
||||
* Tries to receive a character.
|
||||
* If a character is unavailable the function returns -1.
|
||||
*/
|
||||
static int ug_raw_getc(void)
|
||||
{
|
||||
u32 data = ug_io_transaction(0xa0000000);
|
||||
if (data & 0x08000000)
|
||||
return (data >> 16) & 0xff;
|
||||
else
|
||||
return -1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Receives a character.
|
||||
* It fails if the RX fifo is not ready after a number of retries.
|
||||
*/
|
||||
static int ug_getc(void)
|
||||
{
|
||||
int count = UG_READ_ATTEMPTS;
|
||||
|
||||
if (!ug_io_base)
|
||||
return -1;
|
||||
|
||||
while (!ug_is_rxfifo_ready() && count--)
|
||||
barrier();
|
||||
return ug_raw_getc();
|
||||
}
|
||||
|
||||
/*
|
||||
* udbg functions.
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* Transmits a character.
|
||||
*/
|
||||
void ug_udbg_putc(char ch)
|
||||
{
|
||||
ug_putc(ch);
|
||||
}
|
||||
|
||||
/*
|
||||
* Receives a character. Waits until a character is available.
|
||||
*/
|
||||
static int ug_udbg_getc(void)
|
||||
{
|
||||
int ch;
|
||||
|
||||
while ((ch = ug_getc()) == -1)
|
||||
barrier();
|
||||
return ch;
|
||||
}
|
||||
|
||||
/*
|
||||
* Receives a character. If a character is not available, returns -1.
|
||||
*/
|
||||
static int ug_udbg_getc_poll(void)
|
||||
{
|
||||
if (!ug_is_rxfifo_ready())
|
||||
return -1;
|
||||
return ug_getc();
|
||||
}
|
||||
|
||||
/*
|
||||
* Retrieves and prepares the virtual address needed to access the hardware.
|
||||
*/
|
||||
static void __iomem *ug_udbg_setup_exi_io_base(struct device_node *np)
|
||||
{
|
||||
void __iomem *exi_io_base = NULL;
|
||||
phys_addr_t paddr;
|
||||
const unsigned int *reg;
|
||||
|
||||
reg = of_get_property(np, "reg", NULL);
|
||||
if (reg) {
|
||||
paddr = of_translate_address(np, reg);
|
||||
if (paddr)
|
||||
exi_io_base = ioremap(paddr, reg[1]);
|
||||
}
|
||||
return exi_io_base;
|
||||
}
|
||||
|
||||
/*
|
||||
* Checks if a USB Gecko adapter is inserted in any memory card slot.
|
||||
*/
|
||||
static void __iomem *ug_udbg_probe(void __iomem *exi_io_base)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* 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;
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* USB Gecko udbg support initialization.
|
||||
*/
|
||||
void __init ug_udbg_init(void)
|
||||
{
|
||||
struct device_node *np;
|
||||
void __iomem *exi_io_base;
|
||||
|
||||
if (ug_io_base)
|
||||
udbg_printf("%s: early -> final\n", __func__);
|
||||
|
||||
np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-exi");
|
||||
if (!np) {
|
||||
udbg_printf("%s: EXI node not found\n", __func__);
|
||||
goto done;
|
||||
}
|
||||
|
||||
exi_io_base = ug_udbg_setup_exi_io_base(np);
|
||||
if (!exi_io_base) {
|
||||
udbg_printf("%s: failed to setup EXI io base\n", __func__);
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (!ug_udbg_probe(exi_io_base)) {
|
||||
udbg_printf("usbgecko_udbg: not found\n");
|
||||
iounmap(exi_io_base);
|
||||
} else {
|
||||
udbg_putc = ug_udbg_putc;
|
||||
udbg_getc = ug_udbg_getc;
|
||||
udbg_getc_poll = ug_udbg_getc_poll;
|
||||
udbg_printf("usbgecko_udbg: ready\n");
|
||||
}
|
||||
|
||||
done:
|
||||
if (np)
|
||||
of_node_put(np);
|
||||
return;
|
||||
}
|
||||
30
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h
Normal file
30
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h
Normal file
@ -0,0 +1,30 @@
|
||||
/*
|
||||
* arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h
|
||||
*
|
||||
* udbg serial input/output routines for the USB Gecko adapter.
|
||||
* 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 __USBGECKO_UDBG_H
|
||||
#define __USBGECKO_UDBG_H
|
||||
|
||||
#ifdef CONFIG_USBGECKO_UDBG
|
||||
|
||||
extern void __init ug_udbg_init(void);
|
||||
|
||||
#else
|
||||
|
||||
static inline void __init ug_udbg_init(void)
|
||||
{
|
||||
}
|
||||
|
||||
#endif /* CONFIG_USBGECKO_UDBG */
|
||||
|
||||
#endif /* __USBGECKO_UDBG_H */
|
||||
Loading…
x
Reference in New Issue
Block a user