Tegra194: toggle SE clock during context save/restore

This patch adds support to toggle SE clock, using the bpmp_ipc
interface, to enable SE context save/restore. The SE sequence mostly
gets called during System Suspend/Resume.

Change-Id: I9cee12a9e14861d5e3c8c4f18b4d7f898b6ebfa7
Signed-off-by: steven kao <skao@nvidia.com>

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

@@ -151,6 +151,14 @@
 #define TEGRA_RNG1_BASE			U(0x03AE0000)
 #define  RNG1_MUTEX_WATCHDOG_NS_LIMIT	U(0xFE0)
 
+/*******************************************************************************
+ * Tegra HSP doorbell #0 constants
+ ******************************************************************************/
+#define TEGRA_HSP_DBELL_BASE        U(0x03C90000)
+#define  HSP_DBELL_1_ENABLE         U(0x104)
+#define  HSP_DBELL_3_TRIGGER        U(0x300)
+#define  HSP_DBELL_3_ENABLE         U(0x304)
+
 /*******************************************************************************
  * Tegra hardware synchronization primitives for the SPE engine
  ******************************************************************************/
@@ -206,6 +214,13 @@
 #define TEGRA_TZRAM_BASE		U(0x40000000)
 #define TEGRA_TZRAM_SIZE		U(0x40000)
 
+/*******************************************************************************
+ * Tegra CCPLEX-BPMP IPC constants
+ ******************************************************************************/
+#define TEGRA_BPMP_IPC_TX_PHYS_BASE	U(0x4004C000)
+#define TEGRA_BPMP_IPC_RX_PHYS_BASE	U(0x4004D000)
+#define TEGRA_BPMP_IPC_CH_MAP_SIZE	U(0x1000) /* 4KB */
+
 /*******************************************************************************
  * Tegra Clock and Reset Controller constants
  ******************************************************************************/

plat/nvidia/tegra/soc/t194/drivers/se/se.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
- * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2019-2020, NVIDIA CORPORATION. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -10,6 +10,7 @@
 #include <stdbool.h>
 
 #include <arch_helpers.h>
+#include <bpmp_ipc.h>
 #include <common/debug.h>
 #include <drivers/delay_timer.h>
 #include <lib/mmio.h>
@@ -181,6 +182,12 @@ int32_t tegra_se_suspend(void)
 {
 	int32_t ret = 0;
 
+	/* initialise communication channel with BPMP */
+	assert(tegra_bpmp_ipc_init() == 0);
+
+	/* Enable SE clock before SE context save */
+	tegra_bpmp_ipc_enable_clock(TEGRA_CLK_SE);
+
 	/* save SE registers */
 	se_regs[0] = mmio_read_32(TEGRA_SE0_BASE + SE0_MUTEX_WATCHDOG_NS_LIMIT);
 	se_regs[1] = mmio_read_32(TEGRA_SE0_BASE + SE0_AES0_ENTROPY_SRC_AGE_CTRL);
@@ -193,6 +200,9 @@ int32_t tegra_se_suspend(void)
 		ERROR("%s: context save failed (%d)\n", __func__, ret);
 	}
 
+	/* Disable SE clock after SE context save */
+	tegra_bpmp_ipc_disable_clock(TEGRA_CLK_SE);
+
 	return ret;
 }
 
@@ -201,6 +211,12 @@ int32_t tegra_se_suspend(void)
  */
 void tegra_se_resume(void)
 {
+	/* initialise communication channel with BPMP */
+	assert(tegra_bpmp_ipc_init() == 0);
+
+	/* Enable SE clock before SE context restore */
+	tegra_bpmp_ipc_enable_clock(TEGRA_CLK_SE);
+
 	/*
 	 * When TZ takes over after System Resume, TZ should first reconfigure
 	 * SE_MUTEX_WATCHDOG_NS_LIMIT, PKA1_MUTEX_WATCHDOG_NS_LIMIT,
@@ -211,4 +227,7 @@ void tegra_se_resume(void)
 	mmio_write_32(TEGRA_SE0_BASE + SE0_AES0_ENTROPY_SRC_AGE_CTRL, se_regs[1]);
 	mmio_write_32(TEGRA_RNG1_BASE + RNG1_MUTEX_WATCHDOG_NS_LIMIT, se_regs[2]);
 	mmio_write_32(TEGRA_PKA1_BASE + PKA1_MUTEX_WATCHDOG_NS_LIMIT, se_regs[3]);
+
+	/* Disable SE clock after SE context restore */
+	tegra_bpmp_ipc_disable_clock(TEGRA_CLK_SE);
 }

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

@@ -86,6 +86,8 @@ static const mmap_region_t tegra_mmap[] = {
 			(uint8_t)MT_DEVICE | (uint8_t)MT_RW | (uint8_t)MT_SECURE),
 	MAP_REGION_FLAT(TEGRA_SE0_BASE, 0x10000U, /* 64KB */
 			(uint8_t)MT_DEVICE | (uint8_t)MT_RW | (uint8_t)MT_SECURE),
+	MAP_REGION_FLAT(TEGRA_HSP_DBELL_BASE, 0x10000U, /* 64KB */
+			(uint8_t)MT_DEVICE | (uint8_t)MT_RW | (uint8_t)MT_SECURE),
 	MAP_REGION_FLAT(TEGRA_PKA1_BASE, 0x10000U, /* 64KB */
 			(uint8_t)MT_DEVICE | (uint8_t)MT_RW | (uint8_t)MT_SECURE),
 	MAP_REGION_FLAT(TEGRA_RNG1_BASE, 0x10000U, /* 64KB */
@@ -94,6 +96,8 @@ static const mmap_region_t tegra_mmap[] = {
 	MAP_REGION_FLAT(TEGRA_AON_HSP_SM_6_7_BASE, 0x10000U, /* 64KB */
 			(uint8_t)MT_DEVICE | (uint8_t)MT_RW | (uint8_t)MT_SECURE),
 #endif
+	MAP_REGION_FLAT(TEGRA_BPMP_IPC_TX_PHYS_BASE, 0x10000U, /* 64KB */
+			(uint8_t)MT_DEVICE | (uint8_t)MT_RW | (uint8_t)MT_SECURE),
 	MAP_REGION_FLAT(TEGRA_CAR_RESET_BASE, 0x10000U, /* 64KB */
 			(uint8_t)MT_DEVICE | (uint8_t)MT_RW | (uint8_t)MT_SECURE),
 	MAP_REGION_FLAT(TEGRA_PMC_BASE, 0x40000U, /* 256KB */

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

@@ -38,6 +38,8 @@ PLAT_INCLUDES		+=	-I${SOC_DIR}/drivers/include
 
 BL31_SOURCES		+=	drivers/ti/uart/aarch64/16550_console.S \
 				lib/cpus/aarch64/denver.S		\
+				${COMMON_DIR}/drivers/bpmp_ipc/intf.c	\
+				${COMMON_DIR}/drivers/bpmp_ipc/ivc.c	\
 				${COMMON_DIR}/drivers/memctrl/memctrl_v2.c	\
 				${COMMON_DIR}/drivers/smmu/smmu.c	\
 				${SOC_DIR}/drivers/mce/mce.c		\