[PATCH 1/8 v2] powerpc/mpc5121: Add machine restart support

[Grant Likely]

On Wed, Jan 27, 2010 at 5:07 AM, Anatolij Gustschin <agust at denx.de> wrote:
> Add reset module registers representation and
> machine restart callback for mpc5121 platform.

one comment below.

>
> Signed-off-by: Piotr Ziecik <kosmo at semihalf.com>
> Signed-off-by: Wolfgang Denk <wd at denx.de>
> Signed-off-by: Anatolij Gustschin <agust at denx.de>
> Cc: Grant Likely <grant.likely at secretlab.ca>
> Cc: John Rigby <jcrigby at gmail.com>
> ---
>
> Changes since v1:
>  - use 'struct mpc512x_reset_module *' type for 'reset_module_base'
>  - remove empty line
>  - remove leftover colon and use pr_err() instead of printk.
>
>  arch/powerpc/include/asm/mpc5xxx.h            |   14 +++++++++-
>  arch/powerpc/platforms/512x/mpc5121_ads.c     |    1 +
>  arch/powerpc/platforms/512x/mpc5121_generic.c |    1 +
>  arch/powerpc/platforms/512x/mpc512x.h         |    1 +
>  arch/powerpc/platforms/512x/mpc512x_shared.c  |   34 +++++++++++++++++++++++++
>  5 files changed, 50 insertions(+), 1 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/mpc5xxx.h b/arch/powerpc/include/asm/mpc5xxx.h
> index 5ce9c5f..0004986 100644
> --- a/arch/powerpc/include/asm/mpc5xxx.h
> +++ b/arch/powerpc/include/asm/mpc5xxx.h
> @@ -18,5 +18,17 @@
>
>  extern unsigned long mpc5xxx_get_bus_frequency(struct device_node *node);
>
> -#endif /* __ASM_POWERPC_MPC5xxx_H__ */
> +/* MPC512x Reset module registers */
> +struct mpc512x_reset_module {
> +       u32     rcwlr;  /* Reset Configuration Word Low Register */
> +       u32     rcwhr;  /* Reset Configuration Word High Register */
> +       u32     reserved1;
> +       u32     reserved2;
> +       u32     rsr;    /* Reset Status Register */
> +       u32     rmr;    /* Reset Mode Register */
> +       u32     rpr;    /* Reset Protection Register */
> +       u32     rcr;    /* Reset Control Register */
> +       u32     rcer;   /* Reset Control Enable Register */
> +};
>
> +#endif /* __ASM_POWERPC_MPC5xxx_H__ */
> diff --git a/arch/powerpc/platforms/512x/mpc5121_ads.c b/arch/powerpc/platforms/512x/mpc5121_ads.c
> index 441abc4..2f40404 100644
> --- a/arch/powerpc/platforms/512x/mpc5121_ads.c
> +++ b/arch/powerpc/platforms/512x/mpc5121_ads.c
> @@ -68,4 +68,5 @@ define_machine(mpc5121_ads) {
>        .init_IRQ               = mpc5121_ads_init_IRQ,
>        .get_irq                = ipic_get_irq,
>        .calibrate_decr         = generic_calibrate_decr,
> +       .restart                = mpc512x_restart,
>  };
> diff --git a/arch/powerpc/platforms/512x/mpc5121_generic.c b/arch/powerpc/platforms/512x/mpc5121_generic.c
> index 2479de9..de4c3f7 100644
> --- a/arch/powerpc/platforms/512x/mpc5121_generic.c
> +++ b/arch/powerpc/platforms/512x/mpc5121_generic.c
> @@ -55,4 +55,5 @@ define_machine(mpc5121_generic) {
>        .init_IRQ               = mpc512x_init_IRQ,
>        .get_irq                = ipic_get_irq,
>        .calibrate_decr         = generic_calibrate_decr,
> +       .restart                = mpc512x_restart,
>  };
> diff --git a/arch/powerpc/platforms/512x/mpc512x.h b/arch/powerpc/platforms/512x/mpc512x.h
> index 22a5352..c38875c 100644
> --- a/arch/powerpc/platforms/512x/mpc512x.h
> +++ b/arch/powerpc/platforms/512x/mpc512x.h
> @@ -12,5 +12,6 @@
>  #ifndef __MPC512X_H__
>  #define __MPC512X_H__
>  extern void __init mpc512x_init_IRQ(void);
> +extern void mpc512x_restart(char *cmd);
>  void __init mpc512x_declare_of_platform_devices(void);
>  #endif                         /* __MPC512X_H__ */
> diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c
> index 434d683..4745028 100644
> --- a/arch/powerpc/platforms/512x/mpc512x_shared.c
> +++ b/arch/powerpc/platforms/512x/mpc512x_shared.c
> @@ -21,9 +21,43 @@
>  #include <asm/ipic.h>
>  #include <asm/prom.h>
>  #include <asm/time.h>
> +#include <asm/mpc5xxx.h>
>
>  #include "mpc512x.h"
>
> +static struct mpc512x_reset_module __iomem *reset_module_base;
> +
> +static int __init mpc512x_restart_init(void)
> +{
> +       struct device_node *np;
> +
> +       np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset");
> +       if (!np)
> +               return -1;
> +
> +       reset_module_base = of_iomap(np, 0);
> +       of_node_put(np);
> +
> +       return 0;
> +}
> +arch_initcall(mpc512x_restart_init);

Avoid using arch_initcalls for this sort of thing.  Call it explicitly
from your platform code.  Doing an arch_initcall means that platform
code cannot override it, and that on a multiplatform kernel it will
get called on non-5121 platforms.

g.


-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.