Snow: correctly disable trust zone hardware

The kernel assumes that trust zone is disabled.

Change-Id: Ia8d6fa69adcb812a747d8b89eb77e57144423eaa
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/64722
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: Ronald G. Minnich <rminnich@chromium.org>
Tested-by: Ronald G. Minnich <rminnich@chromium.org>
Reviewed-on: http://review.coreboot.org/4431
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

2 files changed, 76 insertions, 0 deletions

diff --git a/src/cpu/samsung/exynos5250/cpu.c b/src/cpu/samsung/exynos5250/cpu.c
index c3632744da..2354be1352 100644
--- a/src/cpu/samsung/exynos5250/cpu.c
+++ b/src/cpu/samsung/exynos5250/cpu.c
@@ -2,6 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright 2013 Google Inc.
+ * Copyright (C) 2012 Samsung Electronics
  *
  * 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
@@ -35,6 +36,28 @@
 static unsigned int cpu_id;
 static unsigned int cpu_rev;
 
+/* Setting TZPC[TrustZone Protection Controller] */
+static void tzpc_init(void)
+{
+	struct exynos_tzpc *tzpc;
+	unsigned int addr;
+
+	for (addr = TZPC0_BASE; addr <= TZPC9_BASE; addr += TZPC_BASE_OFFSET) {
+		tzpc = (struct exynos_tzpc *)addr;
+
+		if (addr == TZPC0_BASE)
+			writel(R0SIZE, &tzpc->r0size);
+
+		writel(DECPROTXSET, &tzpc->decprot0set);
+		writel(DECPROTXSET, &tzpc->decprot1set);
+
+		if (addr != TZPC9_BASE) {
+			writel(DECPROTXSET, &tzpc->decprot2set);
+			writel(DECPROTXSET, &tzpc->decprot3set);
+		}
+	}
+}
+
 static void set_cpu_id(void)
 {
 	cpu_id = readl((void *)EXYNOS_PRO_ID);
@@ -122,6 +145,8 @@ static void cpu_enable(device_t dev)
 	exynos_displayport_init(dev, lcdbase, fb_size);
 
 	set_cpu_id();
+
+	tzpc_init();
 }
 
 static void cpu_init(device_t dev)
diff --git a/src/cpu/samsung/exynos5250/cpu.h b/src/cpu/samsung/exynos5250/cpu.h
index 254106ad81..149de6abb4 100644
--- a/src/cpu/samsung/exynos5250/cpu.h
+++ b/src/cpu/samsung/exynos5250/cpu.h
@@ -91,6 +91,31 @@
 
 /* Distance between each Trust Zone PC register set */
 #define TZPC_BASE_OFFSET		0x10000
+/* TZPC : Register Offsets */
+#define TZPC0_BASE		0x10100000
+#define TZPC1_BASE		0x10110000
+#define TZPC2_BASE		0x10120000
+#define TZPC3_BASE		0x10130000
+#define TZPC4_BASE		0x10140000
+#define TZPC5_BASE		0x10150000
+#define TZPC6_BASE		0x10160000
+#define TZPC7_BASE		0x10170000
+#define TZPC8_BASE		0x10180000
+#define TZPC9_BASE		0x10190000
+#define TZPC10_BASE		0x100E0000
+#define TZPC11_BASE		0x100F0000
+
+/*
+ * TZPC Register Value :
+ * R0SIZE: 0x0 : Size of secured ram
+ */
+#define R0SIZE			0x0
+
+/*
+ * TZPC Decode Protection Register Value :
+ * DECPROTXSET: 0xFF : Set Decode region to non-secure
+ */
+#define DECPROTXSET		0xFF
 
 #define samsung_get_base_adc() ((struct exynos5_adc *)EXYNOS5_ADC_BASE)
 #define samsung_get_base_clock() ((struct exynos5_clock *)EXYNOS5_CLOCK_BASE)
@@ -130,6 +155,32 @@ extern struct tmu_info exynos5250_tmu_info;
 #define RAM_BASE_KB (CONFIG_SYS_SDRAM_BASE >> 10)
 #define RAM_SIZE_KB (CONFIG_DRAM_SIZE_MB << 10UL)
 
+struct exynos_tzpc {
+	u32 r0size;
+	u8 res1[0x7FC];
+	u32 decprot0stat;
+	u32 decprot0set;
+	u32 decprot0clr;
+	u32 decprot1stat;
+	u32 decprot1set;
+	u32 decprot1clr;
+	u32 decprot2stat;
+	u32 decprot2set;
+	u32 decprot2clr;
+	u32 decprot3stat;
+	u32 decprot3set;
+	u32 decprot3clr;
+	u8 res2[0x7B0];
+	u32 periphid0;
+	u32 periphid1;
+	u32 periphid2;
+	u32 periphid3;
+	u32 pcellid0;
+	u32 pcellid1;
+	u32 pcellid2;
+	u32 pcellid3;
+};
+
 static inline u32 get_fb_base_kb(void)
 {
 	return RAM_BASE_KB + RAM_SIZE_KB - FB_SIZE_KB;