From: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Needed for the EMC and MC drivers to know what timings from the DT to use.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---
v4: Replace magic number with PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT
---
drivers/soc/tegra/fuse/tegra-apbmisc.c | 21 +++++++++++++++++++++
include/soc/tegra/fuse.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index 3bf5aba..974bff1 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -28,8 +28,15 @@
#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 +61,18 @@ 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 +131,6 @@ 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 b5f7b5f..b019e34 100644
--- a/include/soc/tegra/fuse.h
+++ b/include/soc/tegra/fuse.h
@@ -56,6 +56,7 @@ 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);
--
2.1.0
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