[PATCH V2] powerpc/MPIC: Add get_version API both for internal and external use

[PATCH V2] powerpc/MPIC: Add get_version API both for internal and external use

[Jia Hongtao]

MPIC version is useful information for both mpic_alloc() and mpic_init().
The patch provide an API to get MPIC version for reusing the code.
Also, some other IP block may need MPIC version for their own use.
The API for external use is also provided.

Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
---
Changes for V2:
* Using mpic_get_version() to implement mpic_primary_get_version()

 arch/powerpc/include/asm/mpic.h |  3 +++
 arch/powerpc/sysdev/mpic.c      | 26 +++++++++++++++++++-------
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h
index c0f9ef9..7d1222d 100644
--- a/arch/powerpc/include/asm/mpic.h
+++ b/arch/powerpc/include/asm/mpic.h
@@ -393,6 +393,9 @@ struct mpic
 #define	MPIC_REGSET_STANDARD		MPIC_REGSET(0)	/* Original MPIC */
 #define	MPIC_REGSET_TSI108		MPIC_REGSET(1)	/* Tsi108/109 PIC */
 
+/* Get the version of primary MPIC */
+extern u32 mpic_primary_get_version(void);
+
 /* Allocate the controller structure and setup the linux irq descs
  * for the range if interrupts passed in. No HW initialization is
  * actually performed.
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index d30e6a6..c893a4b 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1165,10 +1165,27 @@ static struct irq_domain_ops mpic_host_ops = {
 	.xlate = mpic_host_xlate,
 };
 
+static u32 mpic_get_version(struct mpic *mpic)
+{
+	u32 brr1;
+
+	brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
+			MPIC_FSL_BRR1);
+
+	return brr1 & MPIC_FSL_BRR1_VER;
+}
+
 /*
  * Exported functions
  */
 
+u32 mpic_primary_get_version(void)
+{
+	struct mpic *mpic = mpic_primary;
+
+	return mpic_get_version(mpic);
+}
+
 struct mpic * __init mpic_alloc(struct device_node *node,
 				phys_addr_t phys_addr,
 				unsigned int flags,
@@ -1315,7 +1332,6 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 	mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
 
 	if (mpic->flags & MPIC_FSL) {
-		u32 brr1;
 		int ret;
 
 		/*
@@ -1326,9 +1342,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 		mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs,
 			 MPIC_CPU_THISBASE, 0x1000);
 
-		brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
-				MPIC_FSL_BRR1);
-		fsl_version = brr1 & MPIC_FSL_BRR1_VER;
+		fsl_version = mpic_get_version(mpic);
 
 		/* Error interrupt mask register (EIMR) is required for
 		 * handling individual device error interrupts. EIMR
@@ -1518,9 +1532,7 @@ void __init mpic_init(struct mpic *mpic)
 	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
 
 	if (mpic->flags & MPIC_FSL) {
-		u32 brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
-				      MPIC_FSL_BRR1);
-		u32 version = brr1 & MPIC_FSL_BRR1_VER;
+		u32 version = mpic_get_version(mpic);
 
 		/*
 		 * Timer group B is present at the latest in MPIC 3.1 (e.g.
-- 
1.8.0

RE: [PATCH V2] powerpc/MPIC: Add get_version API both for internal and external use

[Jia Hongtao-B38951]

Hi Kumar and Scott,

Any comments on these two patches?

Thanks.
-Hongtao.

> -----Original Message-----
> From: Jia Hongtao-B38951
> Sent: Tuesday, March 26, 2013 1:28 PM
> To: linuxppc-dev@lists.ozlabs.org; galak@kernel.crashing.org
> Cc: Wood Scott-B07421; Li Yang-R58472; Jia Hongtao-B38951
> Subject: [PATCH V2] powerpc/MPIC: Add get_version API both for internal
> and external use
>=20
> MPIC version is useful information for both mpic_alloc() and mpic_init().
> The patch provide an API to get MPIC version for reusing the code.
> Also, some other IP block may need MPIC version for their own use.
> The API for external use is also provided.
>=20
> Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
> Signed-off-by: Li Yang <leoli@freescale.com>
> ---
> Changes for V2:
> * Using mpic_get_version() to implement mpic_primary_get_version()
>=20
>  arch/powerpc/include/asm/mpic.h |  3 +++
>  arch/powerpc/sysdev/mpic.c      | 26 +++++++++++++++++++-------
>  2 files changed, 22 insertions(+), 7 deletions(-)
>=20
> diff --git a/arch/powerpc/include/asm/mpic.h
> b/arch/powerpc/include/asm/mpic.h index c0f9ef9..7d1222d 100644
> --- a/arch/powerpc/include/asm/mpic.h
> +++ b/arch/powerpc/include/asm/mpic.h
> @@ -393,6 +393,9 @@ struct mpic
>  #define	MPIC_REGSET_STANDARD		MPIC_REGSET(0)	/* Original
> MPIC */
>  #define	MPIC_REGSET_TSI108		MPIC_REGSET(1)	/* Tsi108/109
> PIC */
>=20
> +/* Get the version of primary MPIC */
> +extern u32 mpic_primary_get_version(void);
> +
>  /* Allocate the controller structure and setup the linux irq descs
>   * for the range if interrupts passed in. No HW initialization is
>   * actually performed.
> diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
> index d30e6a6..c893a4b 100644
> --- a/arch/powerpc/sysdev/mpic.c
> +++ b/arch/powerpc/sysdev/mpic.c
> @@ -1165,10 +1165,27 @@ static struct irq_domain_ops mpic_host_ops =3D {
>  	.xlate =3D mpic_host_xlate,
>  };
>=20
> +static u32 mpic_get_version(struct mpic *mpic) {
> +	u32 brr1;
> +
> +	brr1 =3D _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
> +			MPIC_FSL_BRR1);
> +
> +	return brr1 & MPIC_FSL_BRR1_VER;
> +}
> +
>  /*
>   * Exported functions
>   */
>=20
> +u32 mpic_primary_get_version(void)
> +{
> +	struct mpic *mpic =3D mpic_primary;
> +
> +	return mpic_get_version(mpic);
> +}
> +
>  struct mpic * __init mpic_alloc(struct device_node *node,
>  				phys_addr_t phys_addr,
>  				unsigned int flags,
> @@ -1315,7 +1332,6 @@ struct mpic * __init mpic_alloc(struct device_node
> *node,
>  	mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE),
> 0x1000);
>=20
>  	if (mpic->flags & MPIC_FSL) {
> -		u32 brr1;
>  		int ret;
>=20
>  		/*
> @@ -1326,9 +1342,7 @@ struct mpic * __init mpic_alloc(struct device_node
> *node,
>  		mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs,
>  			 MPIC_CPU_THISBASE, 0x1000);
>=20
> -		brr1 =3D _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
> -				MPIC_FSL_BRR1);
> -		fsl_version =3D brr1 & MPIC_FSL_BRR1_VER;
> +		fsl_version =3D mpic_get_version(mpic);
>=20
>  		/* Error interrupt mask register (EIMR) is required for
>  		 * handling individual device error interrupts. EIMR @@ -
> 1518,9 +1532,7 @@ void __init mpic_init(struct mpic *mpic)
>  	mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
>=20
>  	if (mpic->flags & MPIC_FSL) {
> -		u32 brr1 =3D _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
> -				      MPIC_FSL_BRR1);
> -		u32 version =3D brr1 & MPIC_FSL_BRR1_VER;
> +		u32 version =3D mpic_get_version(mpic);
>=20
>  		/*
>  		 * Timer group B is present at the latest in MPIC 3.1 (e.g.
> --
> 1.8.0

Re: [PATCH V2] powerpc/MPIC: Add get_version API both for internal and external use

[Scott Wood]

On 03/26/2013 12:28:10 AM, Jia Hongtao wrote:
> MPIC version is useful information for both mpic_alloc() and =20
> mpic_init().
> The patch provide an API to get MPIC version for reusing the code.
> Also, some other IP block may need MPIC version for their own use.
> The API for external use is also provided.
>=20
> Signed-off-by: Jia Hongtao <hongtao.jia@freescale.com>
> Signed-off-by: Li Yang <leoli@freescale.com>
> ---
> Changes for V2:
> * Using mpic_get_version() to implement mpic_primary_get_version()
>=20
>  arch/powerpc/include/asm/mpic.h |  3 +++
>  arch/powerpc/sysdev/mpic.c      | 26 +++++++++++++++++++-------
>  2 files changed, 22 insertions(+), 7 deletions(-)
>=20
> diff --git a/arch/powerpc/include/asm/mpic.h =20
> b/arch/powerpc/include/asm/mpic.h
> index c0f9ef9..7d1222d 100644
> --- a/arch/powerpc/include/asm/mpic.h
> +++ b/arch/powerpc/include/asm/mpic.h
> @@ -393,6 +393,9 @@ struct mpic
>  #define	MPIC_REGSET_STANDARD		MPIC_REGSET(0)	/* =20
> Original MPIC */
>  #define	MPIC_REGSET_TSI108		MPIC_REGSET(1)	/* =20
> Tsi108/109 PIC */
>=20
> +/* Get the version of primary MPIC */
> +extern u32 mpic_primary_get_version(void);
> +
>  /* Allocate the controller structure and setup the linux irq descs
>   * for the range if interrupts passed in. No HW initialization is
>   * actually performed.
> diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
> index d30e6a6..c893a4b 100644
> --- a/arch/powerpc/sysdev/mpic.c
> +++ b/arch/powerpc/sysdev/mpic.c
> @@ -1165,10 +1165,27 @@ static struct irq_domain_ops mpic_host_ops =3D {
>  	.xlate =3D mpic_host_xlate,
>  };
>=20
> +static u32 mpic_get_version(struct mpic *mpic)
> +{
> +	u32 brr1;
> +
> +	brr1 =3D _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
> +			MPIC_FSL_BRR1);
> +
> +	return brr1 & MPIC_FSL_BRR1_VER;
> +}
> +
>  /*
>   * Exported functions
>   */
>=20
> +u32 mpic_primary_get_version(void)
> +{
> +	struct mpic *mpic =3D mpic_primary;
> +
> +	return mpic_get_version(mpic);
> +}

So this just crashes if there is no mpic_primary or it's a non-FSL MPIC?

-Scott=

Re: [PATCH V2] powerpc/MPIC: Add get_version API both for internal and external use

[Scott Wood]

On 03/29/2013 04:51:59 PM, Scott Wood wrote:
> On 03/26/2013 12:28:10 AM, Jia Hongtao wrote:
>> diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
>> index d30e6a6..c893a4b 100644
>> --- a/arch/powerpc/sysdev/mpic.c
>> +++ b/arch/powerpc/sysdev/mpic.c
>> @@ -1165,10 +1165,27 @@ static struct irq_domain_ops mpic_host_ops =3D =20
>> {
>>  	.xlate =3D mpic_host_xlate,
>>  };
>>=20
>> +static u32 mpic_get_version(struct mpic *mpic)
>> +{
>> +	u32 brr1;
>> +
>> +	brr1 =3D _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
>> +			MPIC_FSL_BRR1);
>> +
>> +	return brr1 & MPIC_FSL_BRR1_VER;
>> +}
>> +
>>  /*
>>   * Exported functions
>>   */
>>=20
>> +u32 mpic_primary_get_version(void)
>> +{
>> +	struct mpic *mpic =3D mpic_primary;
>> +
>> +	return mpic_get_version(mpic);
>> +}
>=20
> So this just crashes if there is no mpic_primary or it's a non-FSL =20
> MPIC?

...and since it's specifically checking for the FSL version, "fsl" =20
should be in the name.

-Scott=

RE: [PATCH V2] powerpc/MPIC: Add get_version API both for internal and external use

[Jia Hongtao-B38951]

> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Saturday, March 30, 2013 5:55 AM
> To: Wood Scott-B07421
> Cc: Jia Hongtao-B38951; linuxppc-dev@lists.ozlabs.org;
> galak@kernel.crashing.org; Wood Scott-B07421; Li Yang-R58472; Jia
> Hongtao-B38951
> Subject: Re: [PATCH V2] powerpc/MPIC: Add get_version API both for
> internal and external use
>=20
> On 03/29/2013 04:51:59 PM, Scott Wood wrote:
> > On 03/26/2013 12:28:10 AM, Jia Hongtao wrote:
> >> diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
> >> index d30e6a6..c893a4b 100644
> >> --- a/arch/powerpc/sysdev/mpic.c
> >> +++ b/arch/powerpc/sysdev/mpic.c
> >> @@ -1165,10 +1165,27 @@ static struct irq_domain_ops mpic_host_ops =3D
> >> {
> >>  	.xlate =3D mpic_host_xlate,
> >>  };
> >>
> >> +static u32 mpic_get_version(struct mpic *mpic) {
> >> +	u32 brr1;
> >> +
> >> +	brr1 =3D _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
> >> +			MPIC_FSL_BRR1);
> >> +
> >> +	return brr1 & MPIC_FSL_BRR1_VER;
> >> +}
> >> +
> >>  /*
> >>   * Exported functions
> >>   */
> >>
> >> +u32 mpic_primary_get_version(void)
> >> +{
> >> +	struct mpic *mpic =3D mpic_primary;
> >> +
> >> +	return mpic_get_version(mpic);
> >> +}
> >
> > So this just crashes if there is no mpic_primary or it's a non-FSL
> > MPIC?
>=20
> ...and since it's specifically checking for the FSL version, "fsl"
> should be in the name.
>=20
> -Scott

Right, I will update it with next version.

- Hongtao.