tzc400: adjust filter flag if it is set to FILTER_BIT_ALL

TZC_400_REGION_ATTR_FILTER_BIT_ALL is a simple constant definition, so
it can't get the real filter number to construct the bit flag for all
existing filters. If the platform doesn't have 4 filters, passing
FILTER_BIT_ALL to tzc400_configure_region() will cause assertion or
misconfiguration. So adjust the bit flag against the real filter
number.
Signed-off-by: Heyi Guo <guoheyi@linux.alibaba.com>
Change-Id: Ie5c48303485f3b5015772961ee7c34746121ee84

drivers/arm/tzc/tzc400.c

 /*
- * Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -162,7 +162,9 @@ void tzc400_configure_region0(unsigned int sec_attr,
 /*
  * `tzc400_configure_region` is used to program regions into the TrustZone
  * controller. A region can be associated with more than one filter. The
- * associated filters are passed in as a bitmap (bit0 = filter0).
+ * associated filters are passed in as a bitmap (bit0 = filter0), except that
+ * the value TZC_400_REGION_ATTR_FILTER_BIT_ALL selects all filters, based on
+ * the value of tzc400.num_filters.
  * NOTE:
  * Region 0 is special; it is preferable to use tzc400_configure_region0
  * for this region (see comment for that function).
@@ -176,6 +178,11 @@ void tzc400_configure_region(unsigned int filters,
 {
 	assert(tzc400.base != 0U);
 
+	/* Adjust filter mask by real filter number */
+	if (filters == TZC_400_REGION_ATTR_FILTER_BIT_ALL) {
+		filters = (1U << tzc400.num_filters) - 1U;
+	}
+
 	/* Do range checks on filters and regions. */
 	assert(((filters >> tzc400.num_filters) == 0U) &&
 	       (region < tzc400.num_regions));