[PATCH 4/5] ARM: mach-imx: tzasc: add imx6q_tzc380_early_ns_region1()

[Marco Felsch <m.felsch@pengutronix.de>]

Add a helper function which can be used by the board code to setup an
early non-secure TZASC region1 which covers the whole SDRAM size.

This eliminates the current workaround of configuring region0 as
non-secure/secure region.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 arch/arm/mach-imx/Makefile |  2 +-
 arch/arm/mach-imx/tzasc.c  | 44 ++++++++++++++++++++++++++++++++++++++
 include/mach/imx/tzasc.h   |  1 +
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 23f51fc66019..07e14b392d6c 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -21,7 +21,7 @@ obj-pbl-$(CONFIG_ARCH_IMX8M) += imx8m.o
 obj-pbl-$(CONFIG_ARCH_IMX_SCRATCHMEM) += scratch.o
 obj-$(CONFIG_ARCH_IMX9) += imx9.o imx-v3-image.o
 lwl-$(CONFIG_ARCH_IMX_ATF) += atf.o
-obj-pbl-$(CONFIG_ARCH_IMX8M) += tzasc.o
+obj-pbl-y += tzasc.o
 obj-pbl-$(CONFIG_ARCH_IMX_ROMAPI) += romapi.o
 obj-$(CONFIG_IMX_IIM)	+= iim.o
 obj-$(CONFIG_NAND_IMX) += nand.o
diff --git a/arch/arm/mach-imx/tzasc.c b/arch/arm/mach-imx/tzasc.c
index 4f6da6016601..aad6ece64f18 100644
--- a/arch/arm/mach-imx/tzasc.c
+++ b/arch/arm/mach-imx/tzasc.c
@@ -3,8 +3,10 @@
 #define pr_fmt(fmt) "tzc380: " fmt
 
 #include <common.h>
+#include <mach/imx/esdctl.h>
 #include <mach/imx/generic.h>
 #include <mach/imx/tzasc.h>
+#include <mach/imx/imx6-regs.h>
 #include <linux/bitfield.h>
 #include <linux/bitops.h>
 #include <linux/log2.h>
@@ -71,6 +73,9 @@
  *                         SoC specific defines
  ******************************************************************************/
 
+#define MX6_TZASC1_BASE			0x21d0000
+#define MX6_TZASC2_BASE			0x21d4000
+
 #define GPR_TZASC_EN					BIT(0)
 #define GPR_TZASC_ID_SWAP_BYPASS		BIT(1)
 #define GPR_TZASC_EN_LOCK				BIT(16)
@@ -249,6 +254,45 @@ tzc380_auto_configure(struct tzc380_instance *tzc380, unsigned int region,
  *                          SoC specific helpers
  ******************************************************************************/
 
+static void imx_tzc380_init_and_setup(void __iomem *base, unsigned int region,
+				      resource_size_t region_base,
+				      resource_size_t region_size,
+				      unsigned int region_attr)
+{
+	struct tzc380_instance *tzasc = tzc380_init(base);
+
+	tzc380_auto_configure(tzasc, region, region_base, region_size,
+				region_attr);
+}
+
+/*
+ * imx6q_tzc380_early_ns_region1 - configure the whole DRAM as non-secure
+ *                                 region1
+ *
+ * Passing data between TEE and barebox need to follow some requirements:
+ *  - the location can be accessed by the normal and secure world
+ *  - the mapping in the normal and secure world must be the same to avoid
+ *    manual cache maintenance.
+ *
+ * Therefore this function reads the DRAM size out of the MMDC controller and
+ * configures the whole size as non-secure TZC380 region1. This allows the
+ * early TEE code to map the location as non-secure to while writing the data
+ * e.g. device-tee-overlays. Later on the TEE may reconfigure and lock the
+ * TZC380 regions. The reconfiguration needs to ensure that the exchange data
+ * location is still accessible by the normal world.
+ */
+void imx6q_tzc380_early_ns_region1(void)
+{
+	resource_size_t ram_sz = imx6_get_mmdc_sdram_size();
+
+	imx_tzc380_init_and_setup(IOMEM(MX6_TZASC1_BASE), 1,
+				  MX6_MMDC_PORT01_BASE_ADDR, ram_sz,
+				  TZC380_REGION_SP_NS_RW);
+	imx_tzc380_init_and_setup(IOMEM(MX6_TZASC2_BASE), 1,
+				  MX6_MMDC_PORT01_BASE_ADDR, ram_sz,
+				  TZC380_REGION_SP_NS_RW);
+}
+
 void imx8m_tzc380_init(void)
 {
 	u32 __iomem *gpr = IOMEM(MX8M_IOMUXC_GPR_BASE_ADDR);
diff --git a/include/mach/imx/tzasc.h b/include/mach/imx/tzasc.h
index 51c86f168ee4..4d3f26fc82f1 100644
--- a/include/mach/imx/tzasc.h
+++ b/include/mach/imx/tzasc.h
@@ -6,6 +6,7 @@
 #include <linux/types.h>
 #include <asm/system.h>
 
+void imx6q_tzc380_early_ns_region1(void);
 void imx8m_tzc380_init(void);
 bool imx8m_tzc380_is_enabled(void);
 
-- 
2.39.5