[PATCH] ARM: S5P: Add Support common arch_reset() for S5P SoCs

[PATCH] ARM: S5P: Add Support common arch_reset() for S5P SoCs

[Kukjin Kim]

This patch adds system define for arch_reset() for S5P SoCs
such as S5P6440, S5P6442, S5PC100 and S5PV210/S5PC110.
Now perform reset using Watchdog reset, SWRESET support with
s5p_reset_hook() will be added later.

NOTE: depends on 'Add Watchdog support for S5PC100'

ARM: S5P6442: Add Watchdog Timer map for S5P6442
ARM: S5P: Add System define for arch_reset()
ARM: S5P: Add Support common arch_reset() for S5P SoCs

[PATCH] ARM: S5P: Add Support common arch_reset() for S5P SoCs

[Kukjin Kim]

This patch adds system define for arch_reset() for S5P SoCs
such as S5P6440, S5P6442, S5PC100 and S5PV210/S5PC110.
Now perform reset using Watchdog reset, SWRESET support with
s5p_reset_hook() will be added later.

NOTE: depends on 'Add Watchdog support for S5PC100'

ARM: S5P6442: Add Watchdog Timer map for S5P6442
ARM: S5P: Add System define for arch_reset()
ARM: S5P: Add Support common arch_reset() for S5P SoCs

[PATCH 1/3] ARM: S5P6442: Add Watchdog Timer map for S5P6442

[Kukjin Kim]

From: Jongpill Lee <boyko.lee@samsung.com>

This patch adds definition of Watchdog Timer map.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/mach-s5p6442/include/mach/map.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-s5p6442/include/mach/map.h b/arch/arm/mach-s5p6442/include/mach/map.h
index 32ca424..281d256 100644
--- a/arch/arm/mach-s5p6442/include/mach/map.h
+++ b/arch/arm/mach-s5p6442/include/mach/map.h
@@ -42,6 +42,8 @@
 
 #define S5P6442_PA_SYSTIMER   	(0xEA100000)
 
+#define S5P6442_PA_WATCHDOG	(0xEA200000)
+
 #define S5P6442_PA_UART		(0xEC000000)
 
 #define S5P_PA_UART0		(S5P6442_PA_UART + 0x0)
@@ -65,6 +67,7 @@
 #define S5P6442_PA_PCM1		0xF2500000
 
 /* compatibiltiy defines. */
+#define S3C_PA_WDT		S5P6442_PA_WATCHDOG
 #define S3C_PA_UART		S5P6442_PA_UART
 #define S3C_PA_IIC		S5P6442_PA_IIC0
 
-- 
1.6.2.5

[PATCH 1/3] ARM: S5P6442: Add Watchdog Timer map for S5P6442

[Kukjin Kim]

From: Jongpill Lee <boyko.lee@samsung.com>

This patch adds definition of Watchdog Timer map.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/mach-s5p6442/include/mach/map.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-s5p6442/include/mach/map.h b/arch/arm/mach-s5p6442/include/mach/map.h
index 32ca424..281d256 100644
--- a/arch/arm/mach-s5p6442/include/mach/map.h
+++ b/arch/arm/mach-s5p6442/include/mach/map.h
@@ -42,6 +42,8 @@
 
 #define S5P6442_PA_SYSTIMER   	(0xEA100000)
 
+#define S5P6442_PA_WATCHDOG	(0xEA200000)
+
 #define S5P6442_PA_UART		(0xEC000000)
 
 #define S5P_PA_UART0		(S5P6442_PA_UART + 0x0)
@@ -65,6 +67,7 @@
 #define S5P6442_PA_PCM1		0xF2500000
 
 /* compatibiltiy defines. */
+#define S3C_PA_WDT		S5P6442_PA_WATCHDOG
 #define S3C_PA_UART		S5P6442_PA_UART
 #define S3C_PA_IIC		S5P6442_PA_IIC0
 
-- 
1.6.2.5

[PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Kukjin Kim]

From: Jongpill Lee <boyko.lee@samsung.com>

This patch adds system define for arch_reset() using Watchdog reset.
And adds IO mapping for using WDT.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/plat-s5p/cpu.c                       |    5 +++++
 arch/arm/plat-s5p/include/plat/system-reset.h |   24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/plat-s5p/include/plat/system-reset.h

diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c
index 75cb8c3..1ab55e8 100644
--- a/arch/arm/plat-s5p/cpu.c
+++ b/arch/arm/plat-s5p/cpu.c
@@ -103,6 +103,11 @@ static struct map_desc s5p_iodesc[] __initdata = {
 		.pfn		= __phys_to_pfn(S5P_PA_GPIO),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_WATCHDOG,
+		.pfn		= __phys_to_pfn(S3C_PA_WDT),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
 	},
 };
 
diff --git a/arch/arm/plat-s5p/include/plat/system-reset.h b/arch/arm/plat-s5p/include/plat/system-reset.h
new file mode 100644
index 0000000..7f76a16
--- /dev/null
+++ b/arch/arm/plat-s5p/include/plat/system-reset.h
@@ -0,0 +1,24 @@
+/* linux/arch/arm/plat-s5p/include/plat/system-reset.h
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Based on arch/arm/mach-s3c2410/include/mach/system-reset.h
+ *
+ * S5P - System define for arch_reset()
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <plat/watchdog-reset.h>
+
+static void arch_reset(char mode, const char *cmd)
+{
+	/* Perform reset using Watchdog reset.
+	 * SWRESET support will be added later.
+	 */
+
+	arch_wdt_reset();
+}
-- 
1.6.2.5

[PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Kukjin Kim]

From: Jongpill Lee <boyko.lee@samsung.com>

This patch adds system define for arch_reset() using Watchdog reset.
And adds IO mapping for using WDT.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/plat-s5p/cpu.c                       |    5 +++++
 arch/arm/plat-s5p/include/plat/system-reset.h |   24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/plat-s5p/include/plat/system-reset.h

diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c
index 75cb8c3..1ab55e8 100644
--- a/arch/arm/plat-s5p/cpu.c
+++ b/arch/arm/plat-s5p/cpu.c
@@ -103,6 +103,11 @@ static struct map_desc s5p_iodesc[] __initdata = {
 		.pfn		= __phys_to_pfn(S5P_PA_GPIO),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_WATCHDOG,
+		.pfn		= __phys_to_pfn(S3C_PA_WDT),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
 	},
 };
 
diff --git a/arch/arm/plat-s5p/include/plat/system-reset.h b/arch/arm/plat-s5p/include/plat/system-reset.h
new file mode 100644
index 0000000..7f76a16
--- /dev/null
+++ b/arch/arm/plat-s5p/include/plat/system-reset.h
@@ -0,0 +1,24 @@
+/* linux/arch/arm/plat-s5p/include/plat/system-reset.h
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Based on arch/arm/mach-s3c2410/include/mach/system-reset.h
+ *
+ * S5P - System define for arch_reset()
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <plat/watchdog-reset.h>
+
+static void arch_reset(char mode, const char *cmd)
+{
+	/* Perform reset using Watchdog reset.
+	 * SWRESET support will be added later.
+	 */
+
+	arch_wdt_reset();
+}
-- 
1.6.2.5

[PATCH 3/3] ARM: S5P: Add Support common arch_reset() for S5P SoCs

[Kukjin Kim]

From: Jongpill Lee <boyko.lee@samsung.com>

This patch adds support common arch_reset() for
S5P6440, S5P6442, S5PC100 and S5PV210/S5PC110.
Now perform reset using Watchdog reset, SWRESET
support with s5p_reset_hook() will be added later.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/mach-s5p6440/include/mach/system.h |    7 ++-----
 arch/arm/mach-s5p6442/include/mach/system.h |    7 ++-----
 arch/arm/mach-s5pc100/include/mach/system.h |    9 +--------
 arch/arm/mach-s5pv210/include/mach/system.h |    7 ++-----
 4 files changed, 7 insertions(+), 23 deletions(-)

diff --git a/arch/arm/mach-s5p6440/include/mach/system.h b/arch/arm/mach-s5p6440/include/mach/system.h
index d2dd817..a359ee3 100644
--- a/arch/arm/mach-s5p6440/include/mach/system.h
+++ b/arch/arm/mach-s5p6440/include/mach/system.h
@@ -13,12 +13,9 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-static void arch_idle(void)
-{
-	/* nothing here yet */
-}
+#include <plat/system-reset.h>
 
-static void arch_reset(char mode, const char *cmd)
+static void arch_idle(void)
 {
 	/* nothing here yet */
 }
diff --git a/arch/arm/mach-s5p6442/include/mach/system.h b/arch/arm/mach-s5p6442/include/mach/system.h
index 8bcd8ed..c30c1cc 100644
--- a/arch/arm/mach-s5p6442/include/mach/system.h
+++ b/arch/arm/mach-s5p6442/include/mach/system.h
@@ -13,12 +13,9 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-static void arch_idle(void)
-{
-	/* nothing here yet */
-}
+#include <plat/system-reset.h>
 
-static void arch_reset(char mode, const char *cmd)
+static void arch_idle(void)
 {
 	/* nothing here yet */
 }
diff --git a/arch/arm/mach-s5pc100/include/mach/system.h b/arch/arm/mach-s5pc100/include/mach/system.h
index 681f626..a9ea57c 100644
--- a/arch/arm/mach-s5pc100/include/mach/system.h
+++ b/arch/arm/mach-s5pc100/include/mach/system.h
@@ -11,18 +11,11 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-#include <linux/io.h>
-#include <mach/map.h>
-#include <mach/regs-clock.h>
+#include <plat/system-reset.h>
 
 static void arch_idle(void)
 {
 	/* nothing here yet */
 }
 
-static void arch_reset(char mode, const char *cmd)
-{
-	__raw_writel(S5PC100_SWRESET_RESETVAL, S5PC100_SWRESET);
-	return;
-}
 #endif /* __ASM_ARCH_IRQ_H */
diff --git a/arch/arm/mach-s5pv210/include/mach/system.h b/arch/arm/mach-s5pv210/include/mach/system.h
index 1ca04d5..af8a200 100644
--- a/arch/arm/mach-s5pv210/include/mach/system.h
+++ b/arch/arm/mach-s5pv210/include/mach/system.h
@@ -13,12 +13,9 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-static void arch_idle(void)
-{
-	/* nothing here yet */
-}
+#include <plat/system-reset.h>
 
-static void arch_reset(char mode, const char *cmd)
+static void arch_idle(void)
 {
 	/* nothing here yet */
 }
-- 
1.6.2.5

[PATCH 3/3] ARM: S5P: Add Support common arch_reset() for S5P SoCs

[Kukjin Kim]

From: Jongpill Lee <boyko.lee@samsung.com>

This patch adds support common arch_reset() for
S5P6440, S5P6442, S5PC100 and S5PV210/S5PC110.
Now perform reset using Watchdog reset, SWRESET
support with s5p_reset_hook() will be added later.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/mach-s5p6440/include/mach/system.h |    7 ++-----
 arch/arm/mach-s5p6442/include/mach/system.h |    7 ++-----
 arch/arm/mach-s5pc100/include/mach/system.h |    9 +--------
 arch/arm/mach-s5pv210/include/mach/system.h |    7 ++-----
 4 files changed, 7 insertions(+), 23 deletions(-)

diff --git a/arch/arm/mach-s5p6440/include/mach/system.h b/arch/arm/mach-s5p6440/include/mach/system.h
index d2dd817..a359ee3 100644
--- a/arch/arm/mach-s5p6440/include/mach/system.h
+++ b/arch/arm/mach-s5p6440/include/mach/system.h
@@ -13,12 +13,9 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-static void arch_idle(void)
-{
-	/* nothing here yet */
-}
+#include <plat/system-reset.h>
 
-static void arch_reset(char mode, const char *cmd)
+static void arch_idle(void)
 {
 	/* nothing here yet */
 }
diff --git a/arch/arm/mach-s5p6442/include/mach/system.h b/arch/arm/mach-s5p6442/include/mach/system.h
index 8bcd8ed..c30c1cc 100644
--- a/arch/arm/mach-s5p6442/include/mach/system.h
+++ b/arch/arm/mach-s5p6442/include/mach/system.h
@@ -13,12 +13,9 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-static void arch_idle(void)
-{
-	/* nothing here yet */
-}
+#include <plat/system-reset.h>
 
-static void arch_reset(char mode, const char *cmd)
+static void arch_idle(void)
 {
 	/* nothing here yet */
 }
diff --git a/arch/arm/mach-s5pc100/include/mach/system.h b/arch/arm/mach-s5pc100/include/mach/system.h
index 681f626..a9ea57c 100644
--- a/arch/arm/mach-s5pc100/include/mach/system.h
+++ b/arch/arm/mach-s5pc100/include/mach/system.h
@@ -11,18 +11,11 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-#include <linux/io.h>
-#include <mach/map.h>
-#include <mach/regs-clock.h>
+#include <plat/system-reset.h>
 
 static void arch_idle(void)
 {
 	/* nothing here yet */
 }
 
-static void arch_reset(char mode, const char *cmd)
-{
-	__raw_writel(S5PC100_SWRESET_RESETVAL, S5PC100_SWRESET);
-	return;
-}
 #endif /* __ASM_ARCH_IRQ_H */
diff --git a/arch/arm/mach-s5pv210/include/mach/system.h b/arch/arm/mach-s5pv210/include/mach/system.h
index 1ca04d5..af8a200 100644
--- a/arch/arm/mach-s5pv210/include/mach/system.h
+++ b/arch/arm/mach-s5pv210/include/mach/system.h
@@ -13,12 +13,9 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
-static void arch_idle(void)
-{
-	/* nothing here yet */
-}
+#include <plat/system-reset.h>
 
-static void arch_reset(char mode, const char *cmd)
+static void arch_idle(void)
 {
 	/* nothing here yet */
 }
-- 
1.6.2.5

Re: [PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Kyungmin Park]

On Thu, Jun 24, 2010 at 7:31 AM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> From: Jongpill Lee <boyko.lee@samsung.com>
>
> This patch adds system define for arch_reset() using Watchdog reset.
> And adds IO mapping for using WDT.

Are there any reason to use the WDT to system reset?
As original purpose of WDT. doesn't it better to use system reset?
Since we use the WDT reset at other purpose. but if you add the WDT
reset to system reset.
then we can't control it. bootloader check the reset reason then
report something wrong at previous operation.

So I want to use system reset as original purpose.

Thank you,
Kyungmin Park

>
> Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
> ---
>  arch/arm/plat-s5p/cpu.c                       |    5 +++++
>  arch/arm/plat-s5p/include/plat/system-reset.h |   24 ++++++++++++++++++++++++
>  2 files changed, 29 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/plat-s5p/include/plat/system-reset.h
>
> diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c
> index 75cb8c3..1ab55e8 100644
> --- a/arch/arm/plat-s5p/cpu.c
> +++ b/arch/arm/plat-s5p/cpu.c
> @@ -103,6 +103,11 @@ static struct map_desc s5p_iodesc[] __initdata = {
>                .pfn            = __phys_to_pfn(S5P_PA_GPIO),
>                .length         = SZ_4K,
>                .type           = MT_DEVICE,
> +       }, {
> +               .virtual        = (unsigned long)S3C_VA_WATCHDOG,
> +               .pfn            = __phys_to_pfn(S3C_PA_WDT),
> +               .length         = SZ_4K,
> +               .type           = MT_DEVICE,
>        },
>  };
>
> diff --git a/arch/arm/plat-s5p/include/plat/system-reset.h b/arch/arm/plat-s5p/include/plat/system-reset.h
> new file mode 100644
> index 0000000..7f76a16
> --- /dev/null
> +++ b/arch/arm/plat-s5p/include/plat/system-reset.h
> @@ -0,0 +1,24 @@
> +/* linux/arch/arm/plat-s5p/include/plat/system-reset.h
> + *
> + * Copyright (c) 2010 Samsung Electronics Co., Ltd.
> + *             http://www.samsung.com
> + *
> + * Based on arch/arm/mach-s3c2410/include/mach/system-reset.h
> + *
> + * S5P - System define for arch_reset()
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> +*/
> +
> +#include <plat/watchdog-reset.h>
> +
> +static void arch_reset(char mode, const char *cmd)
> +{
> +       /* Perform reset using Watchdog reset.
> +        * SWRESET support will be added later.
> +        */
> +
> +       arch_wdt_reset();
> +}
> --
> 1.6.2.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

[PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Kyungmin Park]

On Thu, Jun 24, 2010 at 7:31 AM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> From: Jongpill Lee <boyko.lee@samsung.com>
>
> This patch adds system define for arch_reset() using Watchdog reset.
> And adds IO mapping for using WDT.

Are there any reason to use the WDT to system reset?
As original purpose of WDT. doesn't it better to use system reset?
Since we use the WDT reset at other purpose. but if you add the WDT
reset to system reset.
then we can't control it. bootloader check the reset reason then
report something wrong at previous operation.

So I want to use system reset as original purpose.

Thank you,
Kyungmin Park

>
> Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
> ---
> ?arch/arm/plat-s5p/cpu.c ? ? ? ? ? ? ? ? ? ? ? | ? ?5 +++++
> ?arch/arm/plat-s5p/include/plat/system-reset.h | ? 24 ++++++++++++++++++++++++
> ?2 files changed, 29 insertions(+), 0 deletions(-)
> ?create mode 100644 arch/arm/plat-s5p/include/plat/system-reset.h
>
> diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c
> index 75cb8c3..1ab55e8 100644
> --- a/arch/arm/plat-s5p/cpu.c
> +++ b/arch/arm/plat-s5p/cpu.c
> @@ -103,6 +103,11 @@ static struct map_desc s5p_iodesc[] __initdata = {
> ? ? ? ? ? ? ? ?.pfn ? ? ? ? ? ?= __phys_to_pfn(S5P_PA_GPIO),
> ? ? ? ? ? ? ? ?.length ? ? ? ? = SZ_4K,
> ? ? ? ? ? ? ? ?.type ? ? ? ? ? = MT_DEVICE,
> + ? ? ? }, {
> + ? ? ? ? ? ? ? .virtual ? ? ? ?= (unsigned long)S3C_VA_WATCHDOG,
> + ? ? ? ? ? ? ? .pfn ? ? ? ? ? ?= __phys_to_pfn(S3C_PA_WDT),
> + ? ? ? ? ? ? ? .length ? ? ? ? = SZ_4K,
> + ? ? ? ? ? ? ? .type ? ? ? ? ? = MT_DEVICE,
> ? ? ? ?},
> ?};
>
> diff --git a/arch/arm/plat-s5p/include/plat/system-reset.h b/arch/arm/plat-s5p/include/plat/system-reset.h
> new file mode 100644
> index 0000000..7f76a16
> --- /dev/null
> +++ b/arch/arm/plat-s5p/include/plat/system-reset.h
> @@ -0,0 +1,24 @@
> +/* linux/arch/arm/plat-s5p/include/plat/system-reset.h
> + *
> + * Copyright (c) 2010 Samsung Electronics Co., Ltd.
> + * ? ? ? ? ? ? http://www.samsung.com
> + *
> + * Based on arch/arm/mach-s3c2410/include/mach/system-reset.h
> + *
> + * S5P - System define for arch_reset()
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> +*/
> +
> +#include <plat/watchdog-reset.h>
> +
> +static void arch_reset(char mode, const char *cmd)
> +{
> + ? ? ? /* Perform reset using Watchdog reset.
> + ? ? ? ?* SWRESET support will be added later.
> + ? ? ? ?*/
> +
> + ? ? ? arch_wdt_reset();
> +}
> --
> 1.6.2.5
>
> --
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> the body of a message to majordomo at vger.kernel.org
> More majordomo info at ?http://vger.kernel.org/majordomo-info.html
>

RE: [PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Kukjin Kim]

Kyungmin Park wrote:
> 
> On Thu, Jun 24, 2010 at 7:31 AM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> > From: Jongpill Lee <boyko.lee@samsung.com>
> >
> > This patch adds system define for arch_reset() using Watchdog reset.
> > And adds IO mapping for using WDT.
> 
> Are there any reason to use the WDT to system reset?

Yeah, I already commented about that.
Now Samsung SoC hardware engineer recommends to use the reset of watchdog
instead of software reset by restriction of hardware environment.

> As original purpose of WDT. doesn't it better to use system reset?

Original purpose? I think, WDT can be used as software reset.

> Since we use the WDT reset at other purpose. but if you add the WDT
> reset to system reset.
> then we can't control it. bootloader check the reset reason then
> report something wrong at previous operation.

Yeah, I know your needs. If watchdog reset used as software reset, can't
distinguish who call watchdog reset.
And actually, need to check/debug about abnormal reset status when called
watchdog reset.

> 
> So I want to use system reset as original purpose.
> 
Yes, I think so, if can be used SWRESET, will add that functionality.
But right now...no.

(snip)

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.

[PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Kukjin Kim]

Kyungmin Park wrote:
> 
> On Thu, Jun 24, 2010 at 7:31 AM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> > From: Jongpill Lee <boyko.lee@samsung.com>
> >
> > This patch adds system define for arch_reset() using Watchdog reset.
> > And adds IO mapping for using WDT.
> 
> Are there any reason to use the WDT to system reset?

Yeah, I already commented about that.
Now Samsung SoC hardware engineer recommends to use the reset of watchdog
instead of software reset by restriction of hardware environment.

> As original purpose of WDT. doesn't it better to use system reset?

Original purpose? I think, WDT can be used as software reset.

> Since we use the WDT reset at other purpose. but if you add the WDT
> reset to system reset.
> then we can't control it. bootloader check the reset reason then
> report something wrong at previous operation.

Yeah, I know your needs. If watchdog reset used as software reset, can't
distinguish who call watchdog reset.
And actually, need to check/debug about abnormal reset status when called
watchdog reset.

> 
> So I want to use system reset as original purpose.
> 
Yes, I think so, if can be used SWRESET, will add that functionality.
But right now...no.

(snip)

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.

Re: [PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Jassi Brar]

On Thu, Jun 24, 2010 at 10:11 PM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> Kyungmin Park wrote:
>>
>> On Thu, Jun 24, 2010 at 7:31 AM, Kukjin Kim <kgene.kim@samsung.com> wrote:
>> > From: Jongpill Lee <boyko.lee@samsung.com>
>> >
>> > This patch adds system define for arch_reset() using Watchdog reset.
>> > And adds IO mapping for using WDT.
>>
>> Are there any reason to use the WDT to system reset?
>
> Yeah, I already commented about that.
> Now Samsung SoC hardware engineer recommends to use the reset of watchdog
> instead of software reset by restriction of hardware environment.
>
>> As original purpose of WDT. doesn't it better to use system reset?
>
> Original purpose? I think, WDT can be used as software reset.
I agree with Kyungmin Park.
Ideally WDT shud be used as a way to detect deadlock/starvation. When
the bootloader realizes the reset was due to WDT, different course of action
should be taken than that for reset due to, say, reboot command.

[PATCH 2/3] ARM: S5P: Add System define for arch_reset()

[Jassi Brar]

On Thu, Jun 24, 2010 at 10:11 PM, Kukjin Kim <kgene.kim@samsung.com> wrote:
> Kyungmin Park wrote:
>>
>> On Thu, Jun 24, 2010 at 7:31 AM, Kukjin Kim <kgene.kim@samsung.com> wrote:
>> > From: Jongpill Lee <boyko.lee@samsung.com>
>> >
>> > This patch adds system define for arch_reset() using Watchdog reset.
>> > And adds IO mapping for using WDT.
>>
>> Are there any reason to use the WDT to system reset?
>
> Yeah, I already commented about that.
> Now Samsung SoC hardware engineer recommends to use the reset of watchdog
> instead of software reset by restriction of hardware environment.
>
>> As original purpose of WDT. doesn't it better to use system reset?
>
> Original purpose? I think, WDT can be used as software reset.
I agree with Kyungmin Park.
Ideally WDT shud be used as a way to detect deadlock/starvation. When
the bootloader realizes the reset was due to WDT, different course of action
should be taken than that for reset due to, say, reboot command.