[U-Boot] [PATCH 5/8] arm: Add boottime support for the ARM architecture

[Otavio Salvador]

On Tue, Nov 20, 2012 at 12:33 PM, Lee Jones <lee.jones at linaro.org> wrote:

> This patch adds support for passing boot time information to
> the Linus kernel using ATAGS when booting on ARM based devices.
>

Linus or Linux?


> Based heavily on the original driver by Jonas Aaberg.
>
> Signed-off-by: Lee Jones <lee.jones at linaro.org>
> ---
>  arch/arm/include/asm/setup.h |   18 +++++++++++++++++
>  arch/arm/lib/bootm.c         |   45
> ++++++++++++++++++++++++++++++++++++++++--
>  2 files changed, 61 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h
> index 78a7fac..6088440 100644
> --- a/arch/arm/include/asm/setup.h
> +++ b/arch/arm/include/asm/setup.h
> @@ -205,6 +205,19 @@ struct tag_memclk {
>         u32 fmemclk;
>  };
>
> +/* for automatic boot timing testcases */
> +#define ATAG_BOOTTIME  0x41000403
> +#define BOOTTIME_MAX 10
> +
> +#include <boottime.h>
> +
> +struct tag_boottime {
> +       struct boottime_entry entry[BOOTTIME_MAX];
> +       u32 idle;  /* in us */
> +       u32 total; /* in us */
> +       u8 num;
> +};
> +
>  struct tag {
>         struct tag_header hdr;
>         union {
> @@ -227,6 +240,11 @@ struct tag {
>                  * DC21285 specific
>                  */
>                 struct tag_memclk       memclk;
> +
> +               /*
> +                * Boot time
> +                */
> +               struct tag_boottime     boottime;
>         } u;
>  };
>
> diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
> index 1bd2730..03774c8 100644
> --- a/arch/arm/lib/bootm.c
> +++ b/arch/arm/lib/bootm.c
> @@ -28,6 +28,7 @@
>  #include <common.h>
>  #include <command.h>
>  #include <image.h>
> +#include <boottime.h>
>  #include <u-boot/zlib.h>
>  #include <asm/byteorder.h>
>  #include <fdt.h>
> @@ -114,7 +115,8 @@ static void announce_and_cleanup(void)
>         defined(CONFIG_CMDLINE_TAG) || \
>         defined(CONFIG_INITRD_TAG) || \
>         defined(CONFIG_SERIAL_TAG) || \
> -       defined(CONFIG_REVISION_TAG)
> +       defined(CONFIG_REVISION_TAG) || \
> +       defined(CONFIG_BOOTTIME)
>  static void setup_start_tag (bd_t *bd)
>  {
>         params = (struct tag *)bd->bi_boot_params;
> @@ -130,6 +132,37 @@ static void setup_start_tag (bd_t *bd)
>  }
>  #endif
>
> +#ifdef CONFIG_BOOTTIME
> +static void setup_boottime_tags(void)
> +{
> +       unsigned int i;
> +       struct boottime_entry *b;
> +
> +       params->hdr.tag = ATAG_BOOTTIME;
> +       params->hdr.size = tag_size(tag_boottime);
> +
> +       params->u.boottime.idle = boottime_idle_get();
> +       params->u.boottime.total = boottime_idle_done();
> +
> +       for (i = 0; i < BOOTTIME_MAX; i++) {
> +               b = boottime_get_entry(i);
> +               if (b == NULL)
> +                       break;
> +
> +               params->u.boottime.entry[i].time = b->time;
> +               strncpy((char *)params->u.boottime.entry[i].name,
> +                       (char *)b->name, BOOTTIME_MAX_NAME_LEN);
> +               params->u.boottime.entry[i].name[BOOTTIME_MAX_NAME_LEN -
> 1] = '\0';
> +
> +       }
> +
> +       params->u.boottime.num = i;
> +
> +       params = tag_next(params);
> +
> +}
> +#endif
> +
>  #ifdef CONFIG_SETUP_MEMORY_TAGS
>  static void setup_memory_tags(bd_t *bd)
>  {
> @@ -233,6 +266,10 @@ static void setup_end_tag(bd_t *bd)
>  }
>  #endif
>
> +#ifdef CONFIG_BOOTTIME
> +static void setup_boottime_tags(void);
> +#endif
> +
>  #ifdef CONFIG_OF_LIBFDT
>  static int create_fdt(bootm_headers_t *images)
>  {
> @@ -293,9 +330,13 @@ static void boot_prep_linux(bootm_headers_t *images)
>         defined(CONFIG_CMDLINE_TAG) || \
>         defined(CONFIG_INITRD_TAG) || \
>         defined(CONFIG_SERIAL_TAG) || \
> -       defined(CONFIG_REVISION_TAG)
> +       defined(CONFIG_REVISION_TAG) || \
> +       defined (CONFIG_BOOTTIME)
>                 debug("using: ATAGS\n");
>                 setup_start_tag(gd->bd);
> +#ifdef CONFIG_BOOTTIME
> +               setup_boottime_tags();
> +#endif
>  #ifdef CONFIG_SERIAL_TAG
>                 setup_serial_tag(&params);
>  #endif
> --
> 1.7.9.5
>
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>



-- 
Otavio Salvador                             O.S. Systems
E-mail: otavio at ossystems.com.br  http://www.ossystems.com.br
Mobile: +55 53 9981-7854              http://projetos.ossystems.com.br