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>
---
v1 -> v2
- Do not enclose declaration within #ifdef's. Suggestion by Arnd Bergmann.
- Document apparent double setting of BATs.
- Isolate hardcoded settings into functions.
- Prevent compilation if not targeted for the GameCube or Wii.
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 | 53 ++++++++++++++++++++
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h | 2 +
6 files changed, 87 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 cd21e5e..11ae699 100644
--- a/arch/powerpc/include/asm/udbg.h
+++ b/arch/powerpc/include/asm/udbg.h
@@ -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 */
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 fc9af47..e39cad8 100644
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -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
diff --git a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
index 581ce61..f9d7991 100644
--- a/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
+++ b/arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
@@ -270,3 +270,56 @@ done:
of_node_put(np);
return;
}
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
+
+static void __iomem * __init udbg_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;
+ unsigned long addr;
+
+ /*
+ * At this point we have a BAT already setup that enables I/O
+ * to the EXI hardware.
+ */
+
+ exi_io_base = udbg_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;
+
+ /*
+ * Prepare again the same BAT for MMU_init.
+ * This allows udbg I/O to continue working after the MMU is
+ * turned on for real.
+ *
+ * We are assuming here that exi_io_base is identity mapped.
+ */
+ addr = ((unsigned long)exi_io_base) & 0xffff0000;
+ setbat(1, addr, 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 */
--
1.6.3.3
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
