[U-Boot] [PATCH v3] at91sam9x5ek:Pass serial and revision tags to Linux

[Julius Hemanth P]

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On Thu, May 9, 2013 at 10:28 PM, Julius Hemanth P
<juliushemanth at gmail.com> wrote:
> This code is small snippet from patch
> ftp://ftp.linux4sam.org/pub/uboot/u-boot-v2010.06/u-boot-5series_1.0.patch
>
> Linux 2.6.39 (released on www.at91.com/linux4sam) requires serial and
> revision ATAGs to detect NAND device.
>
> This patch provides backward compatibility for old Linux 2.6.39 by
> passing serial and revision ATAGs to Linux kernel.
>
> Signed-off-by: Julius Hemanth <juliushemanth at gmail.com>
> ---
> Changes for v3:
>         - corrected GPBR register access
>         - updated commit message
>
> Changes for v2:
>         - access GPBR using c structure
>         - removed tailing 1 for #define
>         - s/Miscelaneous/Miscellaneous
>         - s/initialisations/initializations
>
> board/atmel/at91sam9x5ek/at91sam9x5ek.c | 33 ++++++++++++++++++++++++++++++++-
>  include/configs/at91sam9x5ek.h          |  5 +++++
>  2 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> b/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> index 8773e6f..116bd83 100644
> --- a/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> +++ b/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> @@ -27,6 +27,7 @@
>  #include <asm/arch/at91_common.h>
>  #include <asm/arch/at91_pmc.h>
>  #include <asm/arch/at91_rstc.h>
> +#include <asm/arch/at91_gpbr.h>
>  #include <asm/arch/gpio.h>
>  #include <asm/arch/clk.h>
>  #include <lcd.h>
> @@ -48,8 +49,34 @@ DECLARE_GLOBAL_DATA_PTR;
>
>  /* ------------------------------------------------------------------------- */
>  /*
> - * Miscelaneous platform dependent initialisations
> + * Miscellaneous platform dependent initializations
>   */
> +
> +#ifdef CONFIG_LOAD_ONE_WIRE_INFO
> +static u32 system_rev;
> +static u32 system_serial_low;
> +
> +u32 get_board_rev(void)
> +{
> +       return system_rev;
> +}
> +
> +void get_board_serial(struct tag_serialnr *serialnr)
> +{
> +       serialnr->high = 0; /* Not used */
> +       serialnr->low = system_serial_low;
> +}
> +
> +void load_1wire_info(void)
> +{
> +       at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
> +
> +       /* serial is in GPBR #2 and revision is in GPBR #3 */
> +       system_serial_low = readl(&gpbr->reg[2]);
> +       system_rev = readl(&gpbr->reg[3]);
> +}
> +#endif
> +
>  #ifdef CONFIG_CMD_NAND
>  static void at91sam9x5ek_nand_hw_init(void)
>  {
> @@ -282,6 +309,10 @@ int board_init(void)
>         /* adress of boot parameters */
>         gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
>
> +#ifdef CONFIG_LOAD_ONE_WIRE_INFO
> +       load_1wire_info();
> +#endif
> +
>  #ifdef CONFIG_CMD_NAND
>         at91sam9x5ek_nand_hw_init();
>  #endif
> diff --git a/include/configs/at91sam9x5ek.h b/include/configs/at91sam9x5ek.h
> index ee6e3fc..995e43b 100644
> --- a/include/configs/at91sam9x5ek.h
> +++ b/include/configs/at91sam9x5ek.h
> @@ -38,6 +38,11 @@
>  #define CONFIG_CMDLINE_TAG             /* enable passing of ATAGs */
>  #define CONFIG_SETUP_MEMORY_TAGS
>  #define CONFIG_INITRD_TAG
> +
> +#define CONFIG_LOAD_ONE_WIRE_INFO
> +#define CONFIG_REVISION_TAG
> +#define CONFIG_SERIAL_TAG
> +
>  #define CONFIG_SKIP_LOWLEVEL_INIT
>  #define CONFIG_BOARD_EARLY_INIT_F
>  #define CONFIG_DISPLAY_CPUINFO
> --
> 1.8.2.2