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    Subject[PATCH v3 03/13] soc/tegra: Add ram code reader helper
    Date
    From: Mikko Perttunen <mperttunen@nvidia.com>

    Needed for the EMC and MC drivers to know what timings from the DT to use.

    Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
    Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
    ---
    drivers/soc/tegra/fuse/tegra-apbmisc.c | 19 +++++++++++++++++++
    include/soc/tegra/fuse.h | 1 +
    2 files changed, 20 insertions(+)

    diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
    index 3bf5aba..e580892 100644
    --- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
    +++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
    @@ -28,8 +28,13 @@
    #define APBMISC_SIZE 0x64
    #define FUSE_SKU_INFO 0x10

    +#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG (0xf << 4)
    +#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT (0x3 << 4)
    +#define PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT 4
    +
    static void __iomem *apbmisc_base;
    static void __iomem *strapping_base;
    +static bool long_ram_code;

    u32 tegra_read_chipid(void)
    {
    @@ -54,6 +59,18 @@ u32 tegra_read_straps(void)
    return 0;
    }

    +u32 tegra_read_ram_code(void)
    +{
    + u32 straps = tegra_read_straps();
    +
    + if (long_ram_code)
    + straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG;
    + else
    + straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT;
    +
    + return straps >> PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT;
    +}
    +
    static const struct of_device_id apbmisc_match[] __initconst = {
    { .compatible = "nvidia,tegra20-apbmisc", },
    {},
    @@ -112,4 +129,6 @@ void __init tegra_init_apbmisc(void)
    strapping_base = of_iomap(np, 1);
    if (!strapping_base)
    pr_err("ioremap tegra strapping_base failed\n");
    +
    + long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
    }
    diff --git a/include/soc/tegra/fuse.h b/include/soc/tegra/fuse.h
    index 8e12494..4ad6fd9 100644
    --- a/include/soc/tegra/fuse.h
    +++ b/include/soc/tegra/fuse.h
    @@ -55,6 +55,7 @@ struct tegra_sku_info {
    };

    u32 tegra_read_straps(void);
    +u32 tegra_read_ram_code(void);
    u32 tegra_read_chipid(void);
    int tegra_fuse_readl(unsigned long offset, u32 *value);

    --
    1.9.3


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