Tegra210: SiP handlers to allow PMC access

This patch adds SiP handler for Tegra210 platforms to service
read/write requests for PMC block. None of the secure registers
are accessible to the NS world though.

Change-Id: I7dc1f10c6a6ee6efc642ddcfb1170fb36d3accff
Signed-off-by: kalyani chidambaram <kalyanic@nvidia.com>

plat/nvidia/tegra/include/drivers/pmc.h

@@ -14,18 +14,29 @@
 #include <tegra_def.h>
 
 #define PMC_CONFIG				U(0x0)
+#define PMC_DPD_ENABLE_0			U(0x24)
 #define PMC_PWRGATE_STATUS			U(0x38)
 #define PMC_PWRGATE_TOGGLE			U(0x30)
+#define PMC_SECURE_SCRATCH0			U(0xb0)
+#define PMC_SECURE_SCRATCH5			U(0xc4)
+#define PMC_CRYPTO_OP_0				U(0xf4)
 #define  PMC_TOGGLE_START			U(0x100)
 #define PMC_SCRATCH39				U(0x138)
+#define PMC_SECURE_SCRATCH6			U(0x224)
+#define PMC_SECURE_SCRATCH7			U(0x228)
 #define PMC_SECURE_DISABLE2			U(0x2c4)
 #define  PMC_SECURE_DISABLE2_WRITE22_ON		(U(1) << 28)
+#define PMC_SECURE_SCRATCH8			U(0x300)
+#define PMC_SECURE_SCRATCH79			U(0x41c)
+#define PMC_FUSE_CONTROL_0			U(0x450)
 #define PMC_SECURE_SCRATCH22			U(0x338)
 #define PMC_SECURE_DISABLE3			U(0x2d8)
 #define  PMC_SECURE_DISABLE3_WRITE34_ON		(U(1) << 20)
 #define  PMC_SECURE_DISABLE3_WRITE35_ON		(U(1) << 22)
 #define PMC_SECURE_SCRATCH34			U(0x368)
 #define PMC_SECURE_SCRATCH35			U(0x36c)
+#define PMC_SECURE_SCRATCH80			U(0xa98)
+#define PMC_SECURE_SCRATCH119			U(0xb34)
 #define PMC_SCRATCH201				U(0x844)
 
 static inline uint32_t tegra_pmc_read_32(uint32_t off)

plat/nvidia/tegra/include/t210/tegra_def.h

@@ -196,6 +196,7 @@
  * Tegra Power Mgmt Controller constants
  ******************************************************************************/
 #define TEGRA_PMC_BASE			U(0x7000E400)
+#define TEGRA_PMC_SIZE			U(0xC00) /* 3k */
 
 /*******************************************************************************
  * Tegra Atomics constants

plat/nvidia/tegra/soc/t210/plat_sip_calls.c

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <assert.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/runtime_svc.h>
+#include <errno.h>
+#include <mmio.h>
+#include <utils_def.h>
+
+#include <memctrl.h>
+#include <pmc.h>
+#include <tegra_private.h>
+#include <tegra_platform.h>
+#include <tegra_def.h>
+
+/*******************************************************************************
+ * PMC parameters
+ ******************************************************************************/
+#define PMC_READ 			U(0xaa)
+#define PMC_WRITE 			U(0xbb)
+
+/*******************************************************************************
+ * Tegra210 SiP SMCs
+ ******************************************************************************/
+#define TEGRA_SIP_PMC_COMMANDS		U(0xC2FFFE00)
+
+/*******************************************************************************
+ * This function is responsible for handling all T210 SiP calls
+ ******************************************************************************/
+int plat_sip_handler(uint32_t smc_fid,
+		     uint64_t x1,
+		     uint64_t x2,
+		     uint64_t x3,
+		     uint64_t x4,
+		     const void *cookie,
+		     void *handle,
+		     uint64_t flags)
+{
+	uint32_t val, ns;
+
+	/* Determine which security state this SMC originated from */
+	ns = is_caller_non_secure(flags);
+	if (!ns)
+		SMC_RET1(handle, SMC_UNK);
+
+	switch (smc_fid) {
+	case TEGRA_SIP_PMC_COMMANDS:
+
+		/* check the address is within PMC range and is 4byte aligned */
+		if ((x2 >= TEGRA_PMC_SIZE) || (x2 & 0x3))
+			return -EINVAL;
+
+		/* pmc_secure_scratch registers are not accessible */
+		if (((x2 >= PMC_SECURE_SCRATCH0) && (x2 <= PMC_SECURE_SCRATCH5)) ||
+		    ((x2 >= PMC_SECURE_SCRATCH6) && (x2 <= PMC_SECURE_SCRATCH7)) ||
+		    ((x2 >= PMC_SECURE_SCRATCH8) && (x2 <= PMC_SECURE_SCRATCH79)) ||
+		    ((x2 >= PMC_SECURE_SCRATCH80) && (x2 <= PMC_SECURE_SCRATCH119)))
+				return -EFAULT;
+
+		/* PMC secure-only registers are not accessible */
+		if ((x2 == PMC_DPD_ENABLE_0) || (x2 == PMC_FUSE_CONTROL_0) ||
+		    (x2 == PMC_CRYPTO_OP_0))
+			return -EFAULT;
+
+		/* Perform PMC read/write */
+		if (x1 == PMC_READ) {
+			val = mmio_read_32((uint32_t)(TEGRA_PMC_BASE + x2));
+			write_ctx_reg(get_gpregs_ctx(handle), CTX_GPREG_X1, val);
+		} else if (x1 == PMC_WRITE) {
+			mmio_write_32((uint32_t)(TEGRA_PMC_BASE + x2), (uint32_t)x3);
+		} else {
+			return -EINVAL;
+		}
+
+		break;
+
+	default:
+		ERROR("%s: unsupported function ID\n", __func__);
+		return -ENOTSUP;
+	}
+
+	return 0;
+}

plat/nvidia/tegra/soc/t210/platform_t210.mk

@@ -36,7 +36,8 @@ BL31_SOURCES		+=	drivers/ti/uart/aarch64/16550_console.S		\
 				${SOC_DIR}/plat_psci_handlers.c			\
 				${SOC_DIR}/plat_setup.c				\
 				${SOC_DIR}/drivers/se/security_engine.c		\
-				${SOC_DIR}/plat_secondary.c
+				${SOC_DIR}/plat_secondary.c		\
+				${SOC_DIR}/plat_sip_calls.c
 
 # Enable workarounds for selected Cortex-A57 erratas.
 A57_DISABLE_NON_TEMPORAL_HINT	:=	1