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>

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>
Albert Herranz · Grant Likely
1 parent b8e8efaa86
Showing 6 changed files with 94 additions and 0 deletions Side-by-side Diff
arch/powerpc/Kconfig.debug
arch/powerpc/include/asm/udbg.h
arch/powerpc/kernel/head_32.S
arch/powerpc/kernel/udbg.c
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.c
arch/powerpc/platforms/embedded6xx/usbgecko_udbg.h
@@ -254,6 +254,14 @@
 	  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
@@ -51,6 +51,7 @@
 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 */
@@ -164,6 +164,9 @@
 #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
@@ -1200,6 +1203,28 @@
 	ori	r11, r11, (BL_1M << 2) | 2
 	mtspr	SPRN_DBAT1U, r11
  
+	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
  
@@ -60,6 +60,8 @@
 	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
@@ -17,6 +17,7 @@
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/udbg.h>
+#include <asm/fixmap.h>
  
 #include "usbgecko_udbg.h"
  
@@ -270,4 +271,58 @@
 		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 */
@@ -27,5 +27,7 @@
  
 #endif /* CONFIG_USBGECKO_UDBG */
  
+void __init udbg_init_usbgecko(void);
+
 #endif /* __USBGECKO_UDBG_H */
...	...	@@ -254,6 +254,14 @@
254	254	using a CPM-based serial port. This assumes that the bootwrapper
255	255	has run, and set up the CPM in a particular way.
256	256
	257	+config PPC_EARLY_DEBUG_USBGECKO
	258	+ bool "Early debugging through the USB Gecko adapter"
	259	+ depends on GAMECUBE_COMMON
	260	+ select USBGECKO_UDBG
	261	+ help
	262	+ Select this to enable early debugging for Nintendo GameCube/Wii
	263	+ consoles via an external USB Gecko adapter.
	264	+
257	265	endchoice
258	266
259	267	config PPC_EARLY_DEBUG_44x_PHYSLOW
...	...	@@ -51,6 +51,7 @@
51	51	extern void __init udbg_init_44x_as1(void);
52	52	extern void __init udbg_init_40x_realmode(void);
53	53	extern void __init udbg_init_cpm(void);
	54	+extern void __init udbg_init_usbgecko(void);
54	55
55	56	#endif /* __KERNEL__ */
56	57	#endif /* _ASM_POWERPC_UDBG_H */
...	...	@@ -164,6 +164,9 @@
164	164	#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
165	165	bl setup_cpm_bat
166	166	#endif
	167	+#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
	168	+ bl setup_usbgecko_bat
	169	+#endif
167	170
168	171	/*
169	172	* Call setup_cpu for CPU 0 and initialize 6xx Idle
...	...	@@ -1200,6 +1203,28 @@
1200	1203	ori r11, r11, (BL_1M << 2) \| 2
1201	1204	mtspr SPRN_DBAT1U, r11
1202	1205
	1206	+ blr
	1207	+#endif
	1208	+
	1209	+#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
	1210	+setup_usbgecko_bat:
	1211	+ /* prepare a BAT for early io */
	1212	+#if defined(CONFIG_GAMECUBE)
	1213	+ lis r8, 0x0c00
	1214	+#elif defined(CONFIG_WII)
	1215	+ lis r8, 0x0d00
	1216	+#else
	1217	+#error Invalid platform for USB Gecko based early debugging.
	1218	+#endif
	1219	+ /*
	1220	+ * The virtual address used must match the virtual address
	1221	+ * associated to the fixmap entry FIX_EARLY_DEBUG_BASE.
	1222	+ */
	1223	+ lis r11, 0xfffe /* top 128K */
	1224	+ ori r8, r8, 0x002a /* uncached, guarded ,rw */
	1225	+ ori r11, r11, 0x2 /* 128K, Vs=1, Vp=0 */
	1226	+ mtspr SPRN_DBAT1L, r8
	1227	+ mtspr SPRN_DBAT1U, r11
1203	1228	blr
1204	1229	#endif
1205	1230
...	...	@@ -60,6 +60,8 @@
60	60	udbg_init_40x_realmode();
61	61	#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
62	62	udbg_init_cpm();
	63	+#elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
	64	+ udbg_init_usbgecko();
63	65	#endif
64	66
65	67	#ifdef CONFIG_PPC_EARLY_DEBUG
...	...	@@ -17,6 +17,7 @@
17	17	#include <asm/io.h>
18	18	#include <asm/prom.h>
19	19	#include <asm/udbg.h>
	20	+#include <asm/fixmap.h>
20	21
21	22	#include "usbgecko_udbg.h"
22	23
...	...	@@ -270,4 +271,58 @@
270	271	of_node_put(np);
271	272	return;
272	273	}
	274	+
	275	+#ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO
	276	+
	277	+static phys_addr_t __init ug_early_grab_io_addr(void)
	278	+{
	279	+#if defined(CONFIG_GAMECUBE)
	280	+ return 0x0c000000;
	281	+#elif defined(CONFIG_WII)
	282	+ return 0x0d000000;
	283	+#else
	284	+#error Invalid platform for USB Gecko based early debugging.
	285	+#endif
	286	+}
	287	+
	288	+/*
	289	+ * USB Gecko early debug support initialization for udbg.
	290	+ */
	291	+void __init udbg_init_usbgecko(void)
	292	+{
	293	+ void __iomem *early_debug_area;
	294	+ void __iomem *exi_io_base;
	295	+
	296	+ /*
	297	+ * At this point we have a BAT already setup that enables I/O
	298	+ * to the EXI hardware.
	299	+ *
	300	+ * The BAT uses a virtual address range reserved at the fixmap.
	301	+ * This must match the virtual address configured in
	302	+ * head_32.S:setup_usbgecko_bat().
	303	+ */
	304	+ early_debug_area = (void __iomem *)__fix_to_virt(FIX_EARLY_DEBUG_BASE);
	305	+ exi_io_base = early_debug_area + 0x00006800;
	306	+
	307	+ /* try to detect a USB Gecko */
	308	+ if (!ug_udbg_probe(exi_io_base))
	309	+ return;
	310	+
	311	+ /* we found a USB Gecko, load udbg hooks */
	312	+ udbg_putc = ug_udbg_putc;
	313	+ udbg_getc = ug_udbg_getc;
	314	+ udbg_getc_poll = ug_udbg_getc_poll;
	315	+
	316	+ /*
	317	+ * Prepare again the same BAT for MMU_init.
	318	+ * This allows udbg I/O to continue working after the MMU is
	319	+ * turned on for real.
	320	+ * It is safe to continue using the same virtual address as it is
	321	+ * a reserved fixmap area.
	322	+ */
	323	+ setbat(1, (unsigned long)early_debug_area,
	324	+ ug_early_grab_io_addr(), 128*1024, PAGE_KERNEL_NCG);
	325	+}
	326	+
	327	+#endif /* CONFIG_PPC_EARLY_DEBUG_USBGECKO */
...	...	@@ -27,5 +27,7 @@
27	27
28	28	#endif /* CONFIG_USBGECKO_UDBG */
29	29
	30	+void __init udbg_init_usbgecko(void);
	31	+
30	32	#endif /* __USBGECKO_UDBG_H */