From: Thierry Reding <treding@xxxxxxxxxx>
This function can be used by drivers to determine whether code is
running on silicon or on a simulation platform.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
Changes in v2:
- fix return value for pre-Tegra194 chips and add comment explaining
why we always return true for those chips
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 92a2d646c183..946a2d9ad117 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -52,6 +52,25 @@ u8 tegra_get_platform(void)
return (tegra_read_chipid() >> 20) & 0xf;
}
+bool tegra_is_silicon(void)
+{
+ switch (tegra_get_chip_id()) {
+ case TEGRA194:
+ if (tegra_get_platform() == 0)
+ return true;
+
+ return false;
+ }
+
+ /*
+ * Chips prior to Tegra194 have a different way of determining whether
+ * they are silicon or not. Since we never supported simulation on the
+ * older Tegra chips, don't bother extracting the information and just
+ * report that we're running on silicon.
+ */
+ return true;
+}
+
u32 tegra_read_straps(void)
{
WARN(!chipid, "Tegra ABP MISC not yet available\n");
diff --git a/include/soc/tegra/fuse.h b/include/soc/tegra/fuse.h
index 214908fc5581..a9db917a1d06 100644
--- a/include/soc/tegra/fuse.h
+++ b/include/soc/tegra/fuse.h
@@ -24,6 +24,7 @@
u32 tegra_read_chipid(void);
u8 tegra_get_chip_id(void);
u8 tegra_get_platform(void);
+bool tegra_is_silicon(void);
enum tegra_revision {
TEGRA_REVISION_UNKNOWN = 0,
--
2.28.0
