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

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

arch/powerpc/Kconfig.debug

+8 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/include/asm/udbg.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/kernel/head_32.S

+25 −0
Original line number Diff line number Diff line
@@ -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.

arch/powerpc/kernel/udbg.c

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c

+56 −0
Original line number Diff line number Diff line
@@ -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 @@ done: 
		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 */