Re: [PATCH] arm: Fix DEBUG_LL for omap zoom2/3

[Tony Lindgren <tony@atomide.com>]

[-- Attachment #1: Type: text/plain, Size: 1399 bytes --]

* Pandita, Vikram <vikram.pandita@ti.com> [100320 15:56]:
> 
> 
> > -----Original Message-----
> > From: Tony Lindgren [mailto:tony@atomide.com]
> > Sent: Friday, March 19, 2010 10:03 PM
> > To: linux-arm-kernel@lists.infradead.org; linux-omap@vger.kernel.org
> > Cc: Pais, Allen; Pandita, Vikram
> > Subject: Re: [PATCH] arm: Fix DEBUG_LL for omap zoom2/3
> > 
> > * Tony Lindgren <tony@atomide.com> [100319 19:43]:
> > > * Tony Lindgren <tony@atomide.com> [100319 17:42]:
> > > > * Tony Lindgren <tony@atomide.com> [100319 17:30]:
> > > > > Hi all,
> > > > >
> > > > > Got a zoom3 finally! This is needed to boot with DEBUG_LL +
> > earlyprintk.
> > > >
> > > > And of course it won't compile because of a missing #.
> > > > Here's the working version.
> > >
> > > One more time. Looks like what I posted is not enough, we
> > > also need to make sure the mapping does not overlap with
> > > other regions. So basically we can't use 0xfb000000 like
> > > we currently have, let's use 0xf7000000 instead unless
> > > somebody has better ideas.
> > 
> > And now 0xf7000000 is in vmalloc area.. Needs to be looked
> > more.
> 
> On internal TI trees, we do have 0xfa400000 working.
> Guess that is the magic number.

Great and thanks for pointing out that hole in the mapping.

Here's an updated version of this patch using 0xfa400000. Few
other things had to be updated accordingly.

Regards,

Tony

[-- Attachment #2: zoom-uart.patch --]
[-- Type: text/x-diff, Size: 3562 bytes --]

>From 5b1cf8010cbb847803db7a1a325f93b3b586005f Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Fri, 19 Mar 2010 17:18:45 -0700
Subject: [PATCH] arm: Fix DEBUG_LL for omap zoom2/3

Zoom2 and 3 have UARTs only on the external debug board.
GPMC needs to be mapped early to use it for DEBUG_LL.

Additionally, 0xfb000000 overlaps with other areas, so
use 0xfa400000 for the virtual address instead.

Note that with the pending serial.c patches you need to
set console=ttyS0,115200n8 as it will be the only UART
mapped. To use DEBUG_LL, you need to pass also earlyprintk
in cmdline.

Cc: Allen Pais <allen.pais@ti.com>
Cc: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index eb62bf9..fd870e1 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -328,6 +328,16 @@ __create_page_tables:
 	add	r0, r4, #0xd8000000 >> 18
 	str	r3, [r0]
 #endif
+#if defined(CONFIG_MACH_OMAP_ZOOM2) || defined(CONFIG_MACH_OMAP_ZOOM3)
+	/*
+	 * Zoom2 and Zoom3 have UARTs only on the debug board.
+	 * The debug board is connected to the GPMC.
+	 */
+	add	r0, r4, #0xfa000000 >> 18
+	orr	r0, r0, #0x00400000 >> 18	@ ZOOM_UART_VIRT
+	orr	r3, r7, #0x10000000		@ ZOOM_UART_BASE
+	str	r3, [r0]
+#endif
 #endif
 	mov	pc, lr
 ENDPROC(__create_page_tables)
diff --git a/arch/arm/mach-omap2/board-zoom-debugboard.c b/arch/arm/mach-omap2/board-zoom-debugboard.c
index e15d2e8..1d7f827 100644
--- a/arch/arm/mach-omap2/board-zoom-debugboard.c
+++ b/arch/arm/mach-omap2/board-zoom-debugboard.c
@@ -82,7 +82,7 @@ static inline void __init zoom_init_smsc911x(void)
 
 static struct plat_serial8250_port serial_platform_data[] = {
 	{
-		.mapbase	= 0x10000000,
+		.mapbase	= ZOOM_UART_BASE,
 		.irq		= OMAP_GPIO_IRQ(102),
 		.flags		= UPF_BOOT_AUTOCONF|UPF_IOREMAP|UPF_SHARE_IRQ,
 		.irqflags	= IRQF_SHARED | IRQF_TRIGGER_RISING,
diff --git a/arch/arm/mach-omap2/include/mach/debug-macro.S b/arch/arm/mach-omap2/include/mach/debug-macro.S
index 4a63a2e..231ea27 100644
--- a/arch/arm/mach-omap2/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap2/include/mach/debug-macro.S
@@ -87,10 +87,10 @@ omap_uart_lsr:	.word	0
 		b	98f
 44:		mov	\rx, #UART_OFFSET(OMAP4_UART4_BASE)
 		b	98f
-95:		mov	\rx, #ZOOM_UART_BASE
+95:		ldr	\rx, =ZOOM_UART_BASE
 		ldr	\tmp, =omap_uart_phys
 		str	\rx, [\tmp, #0]
-		mov	\rx, #ZOOM_UART_VIRT
+		ldr	\rx, =ZOOM_UART_VIRT
 		ldr	\tmp, =omap_uart_virt
 		str	\rx, [\tmp, #0]
 		mov	\rx, #(UART_LSR << ZOOM_PORT_SHIFT)
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index 87f676a..3cfb425 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -166,6 +166,15 @@ static struct map_desc omap34xx_io_desc[] __initdata = {
 		.length		= L4_EMU_34XX_SIZE,
 		.type		= MT_DEVICE
 	},
+#if defined(CONFIG_DEBUG_LL) &&							\
+	(defined(CONFIG_MACH_OMAP_ZOOM2) || defined(CONFIG_MACH_OMAP_ZOOM3))
+	{
+		.virtual	= ZOOM_UART_VIRT,
+		.pfn		= __phys_to_pfn(ZOOM_UART_BASE),
+		.length		= SZ_1M,
+		.type		= MT_DEVICE
+	},
+#endif
 };
 #endif
 #ifdef	CONFIG_ARCH_OMAP4
diff --git a/arch/arm/plat-omap/include/plat/serial.h b/arch/arm/plat-omap/include/plat/serial.h
index 83dce4c..9ec7eab 100644
--- a/arch/arm/plat-omap/include/plat/serial.h
+++ b/arch/arm/plat-omap/include/plat/serial.h
@@ -39,7 +39,7 @@
 
 /* External port on Zoom2/3 */
 #define ZOOM_UART_BASE		0x10000000
-#define ZOOM_UART_VIRT		0xfb000000
+#define ZOOM_UART_VIRT		0xfa400000
 
 #define OMAP_PORT_SHIFT		2
 #define OMAP7XX_PORT_SHIFT	0