diff options
| author | Albert Herranz <albert_herranz@yahoo.es> | 2009-12-12 06:31:51 (GMT) |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2009-12-13 05:24:31 (GMT) |
| commit | d1d56f8c1d5a622228177eca47e9dcff0498bddb (patch) | |
| tree | 450b587fbe84b0e1e6f46f8d6c3bf1b5420b6e39 /arch/powerpc/platforms | |
| parent | b8e8efaa86399c4424becd96402993cf230dab57 (diff) | |
| download | linux-d1d56f8c1d5a622228177eca47e9dcff0498bddb.tar.xz | |
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: Albert Herranz <albert_herranz@yahoo.es>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c | 56 | ||||
| -rw-r--r-- | arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h | 2 |
2 files changed, 58 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c index ba4c7cc..edc956c 100644 --- a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c +++ b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c @@ -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 */ + diff --git a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h index 3929de3..bb6cde4 100644 --- a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h +++ b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h @@ -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 */ |