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soc/tegra: fuse: Cache values of straps and Chip ID registers

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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>
This commit is contained in:
Dmitry Osipenko 2019-12-18 21:23:01 +03:00 committed by Thierry Reding
parent 45f019a684
commit 221c057a84
1 changed files with 10 additions and 11 deletions
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21
drivers/soc/tegra/fuse/tegra-apbmisc.c
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@ -21,18 +21,15 @@
#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;
static u32 strapping;
static u32 chipid;
u32 tegra_read_chipid(void)
{
if (!apbmisc_base) {
WARN(1, "Tegra Chip ID not yet available\n");
return 0;
}
WARN(!chipid, "Tegra Chip ID not yet available\n");
return readl_relaxed(apbmisc_base + 4);
return chipid;
}
u8 tegra_get_chip_id(void)
@ -42,10 +39,7 @@ u8 tegra_get_chip_id(void)
u32 tegra_read_straps(void)
{
if (strapping_base)
return readl_relaxed(strapping_base);
else
return 0;
return strapping;
}
u32 tegra_read_ram_code(void)
@ -104,6 +98,7 @@ void __init tegra_init_revision(void)
void __init tegra_init_apbmisc(void)
{
void __iomem *apbmisc_base, *strapping_base;
struct resource apbmisc, straps;
struct device_node *np;
@ -163,10 +158,14 @@ void __init tegra_init_apbmisc(void)
apbmisc_base = ioremap_nocache(apbmisc.start, resource_size(&apbmisc));
if (!apbmisc_base)
pr_err("failed to map APBMISC registers\n");
else
chipid = readl_relaxed(apbmisc_base + 4);
strapping_base = ioremap_nocache(straps.start, resource_size(&straps));
if (!strapping_base)
pr_err("failed to map strapping options registers\n");
else
strapping = readl_relaxed(strapping_base);
long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
}