NVIDIA: VR: SAUCE: soc/tegra: misc: Use SMCCC to get chipid

Tegra410 and Tegra241 have deprecated HIDREV register. It is
recommended to use ARM SMCCC calls to get chip_id, major and minor
revisions.

Use ARM SMCCC to get chip_id, major and minor revision.

Signed-off-by: Kartik Rajput <kkartik@nvidia.com>
Signed-off-by: Matthew R. Ochs <mochs@nvidia.com>
Acked-by: Jamie Nguyen <jamien@nvidia.com>
Acked-by: Carol L Soto <csoto@nvidia.com>
Signed-off-by: Jamie Nguyen <jamien@nvidia.com>

Author: Kartik Rajput

drivers/soc/tegra/fuse/tegra-apbmisc.c

@@ -4,6 +4,7 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/arm-smccc.h>
 #include <linux/export.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
@@ -27,6 +28,11 @@
 #define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT	\
 	(0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
 
+#define TEGRA_SMCCC_PLATFORM(x)		((x >> 8) & 0xff)
+#define TEGRA_SMCCC_CHIP_ID(x)		((x >> 4) & 0xff)
+#define TEGRA_SMCCC_MAJOR_REV(x)	(x & 0xf)
+#define TEGRA_SMCCC_MINOR_REV(x)	(x & 0xf)
+
 static void __iomem *apbmisc_base;
 static bool long_ram_code;
 static u32 strapping;
@@ -41,21 +47,46 @@ u32 tegra_read_chipid(void)
 
 u8 tegra_get_chip_id(void)
 {
+#ifdef CONFIG_HAVE_ARM_SMCCC_DISCOVERY
+	s32 soc_id = arm_smccc_get_soc_id_version();
+
+	if (soc_id >= 0)
+		return TEGRA_SMCCC_CHIP_ID(soc_id);
+#endif
 	return (tegra_read_chipid() >> 8) & 0xff;
 }
 
 u8 tegra_get_major_rev(void)
 {
+#ifdef CONFIG_HAVE_ARM_SMCCC_DISCOVERY
+	s32 soc_id = arm_smccc_get_soc_id_version();
+
+	if (soc_id >= 0)
+		return TEGRA_SMCCC_MAJOR_REV(soc_id);
+#endif
 	return (tegra_read_chipid() >> 4) & 0xf;
 }
 
 u8 tegra_get_minor_rev(void)
 {
+#ifdef CONFIG_HAVE_ARM_SMCCC_DISCOVERY
+	s32 revision = arm_smccc_get_soc_id_revision();
+
+	if (revision >= 0)
+		return TEGRA_SMCCC_MINOR_REV(revision);
+#endif
 	return (tegra_read_chipid() >> 16) & 0xf;
+
 }
 
 u8 tegra_get_platform(void)
 {
+#ifdef CONFIG_HAVE_ARM_SMCCC_DISCOVERY
+	s32 revision = arm_smccc_get_soc_id_revision();
+
+	if (revision >= 0)
+		return TEGRA_SMCCC_PLATFORM(revision);
+#endif
 	return (tegra_read_chipid() >> 20) & 0xf;
 }