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authorAlbert Herranz <albert_herranz@yahoo.es>2009-12-12 06:31:51 +0000
committerGrant Likely <grant.likely@secretlab.ca>2009-12-12 22:24:31 -0700
commitd1d56f8c1d5a622228177eca47e9dcff0498bddb (patch)
tree450b587fbe84b0e1e6f46f8d6c3bf1b5420b6e39 /arch/powerpc/kernel
parentb8e8efaa86399c4424becd96402993cf230dab57 (diff)
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/kernel')
-rw-r--r--arch/powerpc/kernel/head_32.S25
-rw-r--r--arch/powerpc/kernel/udbg.c2
2 files changed, 27 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 829c3fe7c5a..e025e89fe93 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 +1206,28 @@ 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.
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index fc9af47e212..e39cad83c88 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