Tegra194: smmu: ISO support

The FPGA configuration is encoded in the high byte of
MISCREG_EMU_REVID. Configs GPU and MAX (encoded as
2 and 3) support the ISO SMMU, while BASE (encoded as 1)
does not. This patch implements this encoding and returns
the proper number of SMMU instances.

Change-Id: I024286b6091120c7602f63065d20ce48bcfd13fe
Signed-off-by: Steven Kao <skao@nvidia.com>

plat/nvidia/tegra/include/t194/tegra_def.h

@@ -42,10 +42,13 @@
 /*******************************************************************************
  * Tegra Miscellanous register constants
  ******************************************************************************/
-#define TEGRA_MISC_BASE			0x00100000
-#define  HARDWARE_REVISION_OFFSET	0x4
+#define TEGRA_MISC_BASE				0x00100000U
 
-#define  MISCREG_PFCFG			0x200C
+#define HARDWARE_REVISION_OFFSET	0x4U
+#define MISCREG_EMU_REVID			0x3160U
+#define  BOARD_MASK_BITS			0xFFU
+#define  BOARD_SHIFT_BITS			24U
+#define MISCREG_PFCFG				0x200CU
 
 /*******************************************************************************
  * Tegra TSA Controller constants

plat/nvidia/tegra/soc/t194/plat_smmu.c

@@ -9,6 +9,15 @@
 #include <smmu.h>
 #include <tegra_def.h>
 
+#define BOARD_SYSTEM_FPGA_BASE		U(1)
+#define BASE_CONFIG_SMMU_DEVICES	U(2)
+#define MAX_NUM_SMMU_DEVICES		U(3)
+
+static uint32_t tegra_misc_read_32(uint32_t off)
+{
+	return mmio_read_32(TEGRA_MISC_BASE + off);
+}
+
 /*******************************************************************************
  * Array to hold SMMU context for Tegra186
  ******************************************************************************/
@@ -411,3 +420,19 @@ smmu_regs_t *plat_get_smmu_ctx(void)
 
 	return tegra194_smmu_context;
 }
+
+/*******************************************************************************
+ * Handler to return the support SMMU devices number
+ ******************************************************************************/
+uint32_t plat_get_num_smmu_devices(void)
+{
+	uint32_t ret_num = MAX_NUM_SMMU_DEVICES;
+	uint32_t board_revid = ((tegra_misc_read_32(MISCREG_EMU_REVID) >> \
+							BOARD_SHIFT_BITS) && BOARD_MASK_BITS);
+
+	if (board_revid == BOARD_SYSTEM_FPGA_BASE) {
+		ret_num = BASE_CONFIG_SMMU_DEVICES;
+	}
+
+	return ret_num;
+}

plat/nvidia/tegra/soc/t194/platform_t194.mk

@@ -23,9 +23,6 @@ $(eval $(call add_define,ENABLE_CHIP_VERIFICATION_HARNESS))
 ENABLE_SMMU_DEVICE			:= 1
 $(eval $(call add_define,ENABLE_SMMU_DEVICE))
 
-NUM_SMMU_DEVICES			:= 3
-$(eval $(call add_define,NUM_SMMU_DEVICES))
-
 RESET_TO_BL31				:= 1
 
 PROGRAMMABLE_RESET_ADDRESS		:= 1