firmware: Move Trusted Foundations support

Move the Trusted Foundations support out of arch/arm/firmware and into
drivers/firmware where most other firmware support implementations are
located.

Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/include/linux/firmware/trusted_foundations.h b/include/linux/firmware/trusted_foundations.h
new file mode 100644
index 000000000000..4064e7c74715
--- /dev/null
+++ b/include/linux/firmware/trusted_foundations.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2013, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+/*
+ * Support for the Trusted Foundations secure monitor.
+ *
+ * Trusted Foundation comes active on some ARM consumer devices (most
+ * Tegra-based devices sold on the market are concerned). Such devices can only
+ * perform some basic operations, like setting the CPU reset vector, through
+ * SMC calls to the secure monitor. The calls are completely specific to
+ * Trusted Foundations, and do *not* follow the SMC calling convention or the
+ * PSCI standard.
+ */
+
+#ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
+#define __FIRMWARE_TRUSTED_FOUNDATIONS_H
+
+#include <linux/printk.h>
+#include <linux/bug.h>
+#include <linux/of.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/types.h>
+
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/outercache.h>
+
+#define TF_PM_MODE_LP0			0
+#define TF_PM_MODE_LP1			1
+#define TF_PM_MODE_LP1_NO_MC_CLK	2
+#define TF_PM_MODE_LP2			3
+#define TF_PM_MODE_LP2_NOFLUSH_L2	4
+
+struct trusted_foundations_platform_data {
+	unsigned int version_major;
+	unsigned int version_minor;
+};
+
+#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
+
+void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
+void of_register_trusted_foundations(void);
+bool trusted_foundations_registered(void);
+
+#else /* CONFIG_TRUSTED_FOUNDATIONS */
+static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
+{
+}
+
+static inline void register_trusted_foundations(
+				   struct trusted_foundations_platform_data *pd)
+{
+	/*
+	 * If the system requires TF and we cannot provide it, continue booting
+	 * but disable features that cannot be provided.
+	 */
+	pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
+	pr_err("Secondary processors as well as CPU PM will be disabled.\n");
+#if IS_ENABLED(CONFIG_CACHE_L2X0)
+	pr_err("L2X0 cache will be kept disabled.\n");
+	outer_cache.write_sec = tf_dummy_write_sec;
+#endif
+#if IS_ENABLED(CONFIG_SMP)
+	setup_max_cpus = 0;
+#endif
+	cpu_idle_poll_ctrl(true);
+}
+
+static inline void of_register_trusted_foundations(void)
+{
+	/*
+	 * If we find the target should enable TF but does not support it,
+	 * fail as the system won't be able to do much anyway
+	 */
+	if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
+		register_trusted_foundations(NULL);
+}
+
+static inline bool trusted_foundations_registered(void)
+{
+	return false;
+}
+#endif /* CONFIG_TRUSTED_FOUNDATIONS */
+
+#endif