AArch32: Enable GIC and TZC support

This patch modifies GICv3 and TZC drivers to add AArch32 support.
No modifications are required for the GICv2 driver for AArch32 support.
The TZC driver assumes that the secure world is running in Little-Endian
mode to do 64 bit manipulations. Assertions are present to validate the
assumption.

Note: The legacy GICv3 driver is not supported for AArch32.

Change-Id: Id1bc75a9f5dafb9715c9500ca77b4606eb1e2458

5 files changed, 45 insertions, 4 deletions

diff --git a/drivers/arm/gic/v3/gicv3_main.c b/drivers/arm/gic/v3/gicv3_main.c
index 6c6c7af9..8cb80203 100644
--- a/drivers/arm/gic/v3/gicv3_main.c
+++ b/drivers/arm/gic/v3/gicv3_main.c
@@ -75,8 +75,12 @@ void gicv3_driver_init(const gicv3_driver_data_t *plat_driver_data)
 	       plat_driver_data->g1s_interrupt_num == 0);
 
 	/* Check for system register support */
+#ifdef AARCH32
+	assert(read_id_pfr1() & (ID_PFR1_GIC_MASK << ID_PFR1_GIC_SHIFT));
+#else
 	assert(read_id_aa64pfr0_el1() &
 			(ID_AA64PFR0_GIC_MASK << ID_AA64PFR0_GIC_SHIFT));
+#endif /* AARCH32 */
 
 	/* The GIC version should be 3.0 */
 	gic_version = gicd_read_pidr2(plat_driver_data->gicd_base);
diff --git a/drivers/arm/gic/v3/gicv3_private.h b/drivers/arm/gic/v3/gicv3_private.h
index 9aa83382..1344a885 100644
--- a/drivers/arm/gic/v3/gicv3_private.h
+++ b/drivers/arm/gic/v3/gicv3_private.h
@@ -79,9 +79,13 @@
  * Macro to convert a GICR_TYPER affinity value into a MPIDR value. Bits[31:24]
  * are zeroes.
  */
+#ifdef AARCH32
+#define mpidr_from_gicr_typer(typer_val)	(((typer_val) >> 32) & 0xffffff)
+#else
 #define mpidr_from_gicr_typer(typer_val)				 \
-	((((typer_val >> 56) & MPIDR_AFFLVL_MASK) << MPIDR_AFF3_SHIFT) | \
-	 ((typer_val >> 32) & 0xffffff))
+	(((((typer_val) >> 56) & MPIDR_AFFLVL_MASK) << MPIDR_AFF3_SHIFT) | \
+	 (((typer_val) >> 32) & 0xffffff))
+#endif
 
 /*******************************************************************************
  * Private GICv3 function prototypes for accessing entire registers.
diff --git a/drivers/arm/tzc/tzc400.c b/drivers/arm/tzc/tzc400.c
index e5335872..ca088c32 100644
--- a/drivers/arm/tzc/tzc400.c
+++ b/drivers/arm/tzc/tzc400.c
@@ -206,7 +206,7 @@ void tzc400_configure_region(unsigned int filters,
 	 * Do address range check based on TZC configuration. A 64bit address is
 	 * the max and expected case.
 	 */
-	assert(((region_top <= (UINT64_MAX >> (64 - tzc400.addr_width))) &&
+	assert(((region_top <= _tzc_get_max_top_addr(tzc400.addr_width)) &&
 		(region_base < region_top)));
 
 	/* region_base and (region_top + 1) must be 4KB aligned */
diff --git a/drivers/arm/tzc/tzc_common_private.c b/drivers/arm/tzc/tzc_common_private.c
index dae6c3ac..8b1ddf49 100644
--- a/drivers/arm/tzc/tzc_common_private.c
+++ b/drivers/arm/tzc/tzc_common_private.c
@@ -28,6 +28,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <arch.h>
+#include <arch_helpers.h>
 #include <mmio.h>
 #include <tzc_common.h>
 
@@ -199,4 +201,35 @@ static unsigned int _tzc_read_peripheral_id(uintptr_t base)
 
 	return id;
 }
+
+#ifdef AARCH32
+static unsigned long long _tzc_get_max_top_addr(int addr_width)
+{
+	/*
+	 * Assume at least 32 bit wide address and initialize the max.
+	 * This function doesn't use 64-bit integer arithmetic to avoid
+	 * having to implement additional compiler library functions.
+	 */
+	unsigned long long addr_mask = 0xFFFFFFFF;
+	uint32_t *addr_ptr = (uint32_t *)&addr_mask;
+
+	assert(addr_width >= 32);
+
+	/* This logic works only on little - endian platforms */
+	assert((read_sctlr() & SCTLR_EE_BIT) == 0);
+
+	/*
+	 * If required address width is greater than 32, populate the higher
+	 * 32 bits of the 64 bit field with the max address.
+	 */
+	if (addr_width > 32)
+		*(addr_ptr + 1) = ((1 << (addr_width - 32)) - 1);
+
+	return addr_mask;
+}
+#else
+#define _tzc_get_max_top_addr(addr_width)\
+	(UINT64_MAX >> (64 - (addr_width)))
+#endif /* AARCH32 */
+
 #endif
diff --git a/drivers/arm/tzc/tzc_dmc500.c b/drivers/arm/tzc/tzc_dmc500.c
index b2f0bf67..24e587c1 100644
--- a/drivers/arm/tzc/tzc_dmc500.c
+++ b/drivers/arm/tzc/tzc_dmc500.c
@@ -211,7 +211,7 @@ void tzc_dmc500_configure_region(int region_no,
 	 * Do address range check based on DMC-TZ configuration. A 43bit address
 	 * is the max and expected case.
 	 */
-	assert(((region_top <= (UINT64_MAX >> (64 - 43))) &&
+	assert(((region_top <= _tzc_get_max_top_addr(43)) &&
 		(region_base < region_top)));
 
 	/* region_base and (region_top + 1) must be 4KB aligned */