Commit d1d56f8c authored by Albert Herranz's avatar Albert Herranz Committed by Grant Likely

powerpc: gamecube/wii: early debugging using usbgecko

Add support for using the USB Gecko adapter as an early debugging
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: default avatarAlbert Herranz <albert_herranz@yahoo.es>
Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent b8e8efaa
......@@ -254,6 +254,14 @@ config PPC_EARLY_DEBUG_CPM
using a CPM-based serial port. This assumes that the bootwrapper
has run, and set up the CPM in a particular way.
config PPC_EARLY_DEBUG_USBGECKO
bool "Early debugging through the USB Gecko adapter"
depends on GAMECUBE_COMMON
select USBGECKO_UDBG
help
Select this to enable early debugging for Nintendo GameCube/Wii
consoles via an external USB Gecko adapter.
endchoice
config PPC_EARLY_DEBUG_44x_PHYSLOW
......
......@@ -51,6 +51,7 @@ extern void __init udbg_init_btext(void);
extern void __init udbg_init_44x_as1(void);
extern void __init udbg_init_40x_realmode(void);
extern void __init udbg_init_cpm(void);
extern void __init udbg_init_usbgecko(void);
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_UDBG_H */
......@@ -164,6 +164,9 @@ __after_mmu_off:
#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
bl setup_cpm_bat
#endif
#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
bl setup_usbgecko_bat
#endif
/*
* Call setup_cpu for CPU 0 and initialize 6xx Idle
......@@ -1203,6 +1206,28 @@ setup_cpm_bat:
blr
#endif
#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
setup_usbgecko_bat:
/* prepare a BAT for early io */
#if defined(CONFIG_GAMECUBE)
lis r8, 0x0c00
#elif defined(CONFIG_WII)
lis r8, 0x0d00
#else
#error Invalid platform for USB Gecko based early debugging.
#endif
/*
* The virtual address used must match the virtual address
* associated to the fixmap entry FIX_EARLY_DEBUG_BASE.
*/
lis r11, 0xfffe /* top 128K */
ori r8, r8, 0x002a /* uncached, guarded ,rw */
ori r11, r11, 0x2 /* 128K, Vs=1, Vp=0 */
mtspr SPRN_DBAT1L, r8
mtspr SPRN_DBAT1U, r11
blr
#endif
#ifdef CONFIG_8260
/* Jump into the system reset for the rom.
* We first disable the MMU, and then jump to the ROM reset address.
......
......@@ -60,6 +60,8 @@ void __init udbg_early_init(void)
udbg_init_40x_realmode();
#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
udbg_init_cpm();
#elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
udbg_init_usbgecko();
#endif
#ifdef CONFIG_PPC_EARLY_DEBUG
......
......@@ -17,6 +17,7 @@
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/fixmap.h>
#include "usbgecko_udbg.h"
......@@ -270,3 +271,58 @@ void __init ug_udbg_init(void)
of_node_put(np);
return;
}
#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
static phys_addr_t __init ug_early_grab_io_addr(void)
{
#if defined(CONFIG_GAMECUBE)
return 0x0c000000;
#elif defined(CONFIG_WII)
return 0x0d000000;
#else
#error Invalid platform for USB Gecko based early debugging.
#endif
}
/*
* USB Gecko early debug support initialization for udbg.
*/
void __init udbg_init_usbgecko(void)
{
void __iomem *early_debug_area;
void __iomem *exi_io_base;
/*
* At this point we have a BAT already setup that enables I/O
* to the EXI hardware.
*
* The BAT uses a virtual address range reserved at the fixmap.
* This must match the virtual address configured in
* head_32.S:setup_usbgecko_bat().
*/
early_debug_area = (void __iomem *)__fix_to_virt(FIX_EARLY_DEBUG_BASE);
exi_io_base = early_debug_area + 0x00006800;
/* try to detect a USB Gecko */
if (!ug_udbg_probe(exi_io_base))
return;
/* we found a USB Gecko, load udbg hooks */
udbg_putc = ug_udbg_putc;
udbg_getc = ug_udbg_getc;
udbg_getc_poll = ug_udbg_getc_poll;
/*
* Prepare again the same BAT for MMU_init.
* This allows udbg I/O to continue working after the MMU is
* turned on for real.
* It is safe to continue using the same virtual address as it is
* a reserved fixmap area.
*/
setbat(1, (unsigned long)early_debug_area,
ug_early_grab_io_addr(), 128*1024, PAGE_KERNEL_NCG);
}
#endif /* CONFIG_PPC_EARLY_DEBUG_USBGECKO */
......@@ -27,4 +27,6 @@ static inline void __init ug_udbg_init(void)
#endif /* CONFIG_USBGECKO_UDBG */
void __init udbg_init_usbgecko(void);
#endif /* __USBGECKO_UDBG_H */
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment