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Date: Wed, 12 Nov 2014 08:56:26 +0100 From: Tomeu Vizoso <tomeu.vizoso@...labora.com> To: linux-tegra@...r.kernel.org Cc: Javier Martinez Canillas <javier.martinez@...labora.co.uk>, mikko.perttunen@...si.fi, acourbot@...dia.com, Mikko Perttunen <mperttunen@...dia.com>, Tomeu Vizoso <tomeu.vizoso@...labora.com>, Stephen Warren <swarren@...dotorg.org>, Thierry Reding <thierry.reding@...il.com>, Alexandre Courbot <gnurou@...il.com>, Peter De Schrijver <pdeschrijver@...dia.com>, linux-kernel@...r.kernel.org Subject: [PATCH v4 03/13] soc/tegra: Add ram code reader helper From: Mikko Perttunen <mperttunen@...dia.com> Needed for the EMC and MC drivers to know what timings from the DT to use. Signed-off-by: Mikko Perttunen <mperttunen@...dia.com> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com> --- v4: Replace magic number with PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT --- 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..dc96a62 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_SHIFT 4 +#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG (0xf << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT) +#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT (0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT) + 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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