From d5f14e585c4d07e913f8f52ebd0f22d4d808bee5 Mon Sep 17 00:00:00 2001
From: Ahmad Fatoum <ahmad@a3f.at>
Date: Fri, 15 Nov 2019 08:52:53 +0100
Subject: ARM: psci: factor out smc command into commands/

So far, the smc command was only usable when barebox also provides the
secure monitor. It's useful to have it when barebox is a PSCI consumer
as well to test whether the secure monitor works.
Factor out the code into commands/ in preparation to do so.
No functional change.

Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 commands/Kconfig  |  15 ++++++++
 commands/Makefile |   1 +
 commands/smc.c    | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 123 insertions(+)
 create mode 100644 commands/smc.c

(limited to 'commands')

diff --git a/commands/Kconfig b/commands/Kconfig
index a6db52ae54..08b3af8b20 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -1867,6 +1867,21 @@ config CMD_POWEROFF
 	help
 	  Turn the power off.
 
+config CMD_SMC
+	bool
+	depends on ARM_PSCI
+	prompt "PSCI test command"
+	default CONFIG_ARM_PSCI_DEBUG
+	help
+	  Secure monitor code test command
+
+	  Usage: smc [-nic]
+
+	  Options:
+	        -n	Install secure monitor and switch to nonsecure mode
+	        -i	Show information about installed PSCI version
+	        -c	Start secondary CPU core
+
 config CMD_SPI
 	bool
 	depends on SPI
diff --git a/commands/Makefile b/commands/Makefile
index 2f0980185c..01082de44c 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_CMD_MEMSET)	+= memset.o
 obj-$(CONFIG_CMD_EDIT)		+= edit.o
 obj-$(CONFIG_CMD_EXEC)		+= exec.o
 obj-$(CONFIG_CMD_SLEEP)		+= sleep.o
+obj-$(CONFIG_CMD_SMC)		+= smc.o
 obj-$(CONFIG_CMD_MSLEEP)	+= msleep.o
 obj-$(CONFIG_CMD_RESET)		+= reset.o
 obj-$(CONFIG_CMD_POWEROFF)	+= poweroff.o
diff --git a/commands/smc.c b/commands/smc.c
new file mode 100644
index 0000000000..2a00e15867
--- /dev/null
+++ b/commands/smc.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <common.h>
+#include <command.h>
+#include <getopt.h>
+
+#include <asm/psci.h>
+#include <asm/secure.h>
+#include <linux/arm-smccc.h>
+
+void second_entry(void)
+{
+	struct arm_smccc_res res;
+
+	psci_printf("2nd CPU online, now turn off again\n");
+
+	arm_smccc_smc(ARM_PSCI_0_2_FN_CPU_OFF,
+		      0, 0, 0, 0, 0, 0, 0, &res);
+
+	psci_printf("2nd CPU still alive?\n");
+
+	while (1);
+}
+
+static const char *psci_xlate_str(long err)
+{
+       static char errno_string[sizeof "error 0x123456789ABCDEF0"];
+
+       switch(err)
+       {
+       case ARM_PSCI_RET_SUCCESS:
+	       return "Success";
+       case ARM_PSCI_RET_NOT_SUPPORTED:
+	       return "Operation not supported";
+       case ARM_PSCI_RET_INVAL:
+	       return "Invalid argument";
+       case ARM_PSCI_RET_DENIED:
+	       return "Operation not permitted";
+       case ARM_PSCI_RET_ALREADY_ON:
+	       return "CPU already on";
+       case ARM_PSCI_RET_ON_PENDING:
+	       return "CPU_ON in progress";
+       case ARM_PSCI_RET_INTERNAL_FAILURE:
+	       return "Internal failure";
+       case ARM_PSCI_RET_NOT_PRESENT:
+	       return "Trusted OS not present on core";
+       case ARM_PSCI_RET_DISABLED:
+	       return "CPU is disabled";
+       case ARM_PSCI_RET_INVALID_ADDRESS:
+	       return "Bad address";
+       }
+
+       sprintf(errno_string, "error 0x%lx", err);
+       return errno_string;
+}
+
+static int do_smc(int argc, char *argv[])
+{
+	long ret;
+	int opt;
+	struct arm_smccc_res res = {
+		.a0 = 0xdeadbee0,
+		.a1 = 0xdeadbee1,
+		.a2 = 0xdeadbee2,
+		.a3 = 0xdeadbee3,
+	};
+
+	if (argc < 2)
+		return COMMAND_ERROR_USAGE;
+
+	while ((opt = getopt(argc, argv, "nic")) > 0) {
+		switch (opt) {
+		case 'n':
+			armv7_secure_monitor_install();
+			break;
+		case 'i':
+			arm_smccc_smc(ARM_PSCI_0_2_FN_PSCI_VERSION,
+				      0, 0, 0, 0, 0, 0, 0, &res);
+			printf("found psci version %ld.%ld\n", res.a0 >> 16, res.a0 & 0xffff);
+			break;
+		case 'c':
+			arm_smccc_smc(ARM_PSCI_0_2_FN_CPU_ON,
+				      1, (unsigned long)second_entry, 0, 0, 0, 0, 0, &res);
+			ret = (long)res.a0;
+			printf("CPU_ON returns with: %s\n", psci_xlate_str(ret));
+			if (ret)
+				return COMMAND_ERROR;
+		}
+	}
+
+
+	return 0;
+}
+BAREBOX_CMD_HELP_START(smc)
+BAREBOX_CMD_HELP_TEXT("Secure monitor code test command")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-n",  "Install secure monitor and switch to nonsecure mode")
+BAREBOX_CMD_HELP_OPT ("-i",  "Show information about installed PSCI version")
+BAREBOX_CMD_HELP_OPT ("-c",  "Start secondary CPU core")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(smc)
+	.cmd = do_smc,
+	BAREBOX_CMD_DESC("secure monitor test command")
+	BAREBOX_CMD_GROUP(CMD_GRP_MISC)
+BAREBOX_CMD_END
-- 
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