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_herr...@yahoo.es> --- arch/powerpc/Kconfig.debug | 8 +++ arch/powerpc/include/asm/udbg.h | 1 + arch/powerpc/kernel/head_32.S | 21 +++++++ arch/powerpc/kernel/udbg.c | 2 + arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c | 59 ++++++++++++++++++++ arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h | 2 + 6 files changed, 93 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index 3b10051..11e385b 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -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 diff --git a/arch/powerpc/include/asm/udbg.h b/arch/powerpc/include/asm/udbg.h index 9dfedec..5abfd0f 100644 --- a/arch/powerpc/include/asm/udbg.h +++ b/arch/powerpc/include/asm/udbg.h @@ -54,6 +54,7 @@ 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 */ diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index 829c3fe..c3f3737 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -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 +1206,24 @@ 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 + mr r11, r8 + ori r8, r8, 0x002a /* uncached, guarded ,rw */ + ori r11, r11, 0x3 /* 128K */ + 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. diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c index 2711050..65a7926 100644 --- a/arch/powerpc/kernel/udbg.c +++ b/arch/powerpc/kernel/udbg.c @@ -63,6 +63,8 @@ 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 diff --git a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c index ba4c7cc..3f125b6 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 +271,61 @@ done: of_node_put(np); return; } + +#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO + +static void __init ug_early_remap(void) +{ + unsigned long addr; + void __iomem *io; + + if (ug_io_base) { + addr = (unsigned long)ug_io_base; + set_fixmap_nocache(FIX_EARLY_DEBUG_BASE, addr & PAGE_MASK); + io = (void __iomem *)__fix_to_virt(FIX_EARLY_DEBUG_BASE); + io += addr & ~PAGE_MASK; + udbg_printf("%s: %p -> %p\n", __func__, ug_io_base, io); + ug_io_base = io; + } +} + +static void __iomem * __init ug_early_grab_exi_io_base(void) +{ +#if defined(CONFIG_GAMECUBE) + return (void __iomem *)0x0c006800; +#elif defined(CONFIG_WII) + return (void __iomem *)0x0d006800; +#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 *exi_io_base; + + /* + * At this point we have a BAT already setup that enables I/O + * to the EXI hardware. + */ + + exi_io_base = ug_early_grab_exi_io_base(); + if (!exi_io_base) + return; + + /* 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; + udbg_early_remap = ug_early_remap; +} + +#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 */ -- 1.6.3.3 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev