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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/platforms/embedded6xx
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/platforms/embedded6xx')
-rw-r--r--arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c56
-rw-r--r--arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h2
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 ba4c7cc4f0f1..edc956cc8b13 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 3929de366cf1..bb6cde4ad764 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 */