mirror of https://gitee.com/openkylin/linux.git
soc/tegra: fuse: Cache values of straps and Chip ID registers
There is no need to re-read Chip ID and HW straps out from hardware each time, it is a bit nicer to cache the values in memory. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
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@ -21,18 +21,15 @@
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#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT \
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(0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
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static void __iomem *apbmisc_base;
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static void __iomem *strapping_base;
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static bool long_ram_code;
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static u32 strapping;
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static u32 chipid;
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u32 tegra_read_chipid(void)
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{
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if (!apbmisc_base) {
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WARN(1, "Tegra Chip ID not yet available\n");
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return 0;
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}
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WARN(!chipid, "Tegra Chip ID not yet available\n");
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return readl_relaxed(apbmisc_base + 4);
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return chipid;
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}
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u8 tegra_get_chip_id(void)
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@ -42,10 +39,7 @@ u8 tegra_get_chip_id(void)
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u32 tegra_read_straps(void)
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{
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if (strapping_base)
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return readl_relaxed(strapping_base);
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else
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return 0;
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return strapping;
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}
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u32 tegra_read_ram_code(void)
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@ -104,6 +98,7 @@ void __init tegra_init_revision(void)
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void __init tegra_init_apbmisc(void)
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{
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void __iomem *apbmisc_base, *strapping_base;
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struct resource apbmisc, straps;
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struct device_node *np;
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@ -163,10 +158,14 @@ void __init tegra_init_apbmisc(void)
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apbmisc_base = ioremap_nocache(apbmisc.start, resource_size(&apbmisc));
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if (!apbmisc_base)
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pr_err("failed to map APBMISC registers\n");
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else
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chipid = readl_relaxed(apbmisc_base + 4);
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strapping_base = ioremap_nocache(straps.start, resource_size(&straps));
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if (!strapping_base)
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pr_err("failed to map strapping options registers\n");
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else
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strapping = readl_relaxed(strapping_base);
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long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
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}
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