Rework use of ARM GIC drivers on ARM platforms

Suport for ARM GIC v2.0 and v3.0 drivers has been reworked to create three
separate drivers instead of providing a single driver that can work on both
versions of the GIC architecture. These drivers correspond to the following
software use cases:

1. A GICv2 only driver that can run only on ARM GIC v2.0 implementations
   e.g. GIC-400

2. A GICv3 only driver that can run only on ARM GIC v3.0 implementations
   e.g. GIC-500 in a mode where all interrupt regimes use GICv3 features

3. A deprecated GICv3 driver that operates in legacy mode. This driver can
   operate only in the GICv2 mode in the secure world. On a GICv3 system, this
   driver allows normal world to run in either GICv3 mode (asymmetric mode)
   or in the GICv2 mode. Both modes of operation are deprecated on GICv3
   systems.

ARM platforms implement both versions of the GIC architecture. This patch adds a
layer of abstraction to help ARM platform ports chose the right GIC driver and
corresponding platform support. This is as described below:

1. A set of ARM common functions have been introduced to initialise the GIC and
   the driver during cold and warm boot. These functions are prefixed as
   "plat_arm_gic_". Weak definitions of these functions have been provided for
   each type of driver.

2. Each platform includes the sources that implement the right functions
   directly into the its makefile. The FVP can be instantiated with different
   versions of the GIC architecture. It uses the FVP_USE_GIC_DRIVER build option
   to specify which of the three drivers should be included in the build.

3. A list of secure interrupts has to be provided to initialise each of the
  three GIC drivers. For GIC v3.0 the interrupt ids have to be further
  categorised as Group 0 and Group 1 Secure interrupts. For GIC v2.0, the two
  types are merged and treated as Group 0 interrupts.

  The two lists of interrupts are exported from the platform_def.h. The lists
  are constructed by adding a list of board specific interrupt ids to a list of
  ids common to all ARM platforms and Compute sub-systems.

This patch also makes some fields of `arm_config` data structure in FVP redundant
and these unused fields are removed.

Change-Id: Ibc8c087be7a8a6b041b78c2c3bd0c648cd2035d8

5 files changed, 32 insertions, 9 deletions

diff --git a/include/plat/arm/common/arm_config.h b/include/plat/arm/common/arm_config.h
index 0b161276..24c1f0a1 100644
--- a/include/plat/arm/common/arm_config.h
+++ b/include/plat/arm/common/arm_config.h
@@ -42,12 +42,6 @@ enum arm_config_flags {
 };
 
 typedef struct arm_config {
-	uintptr_t gicd_base;
-	uintptr_t gicc_base;
-	uintptr_t gich_base;
-	uintptr_t gicv_base;
-	unsigned int max_aff0;
-	unsigned int max_aff1;
 	unsigned long flags;
 } arm_config_t;
 
diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index 4726d5e5..5c03feb9 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -135,6 +135,22 @@
 #define ARM_IRQ_SEC_SGI_6		14
 #define ARM_IRQ_SEC_SGI_7		15
 
+/*
+ * Define a list of Group 1 Secure and Group 0 interrupts as per GICv3
+ * terminology. On a GICv2 system or mode, the lists will be merged and treated
+ * as Group 0 interrupts.
+ */
+#define ARM_G1S_IRQS			ARM_IRQ_SEC_PHY_TIMER,		\
+					ARM_IRQ_SEC_SGI_1,		\
+					ARM_IRQ_SEC_SGI_2,		\
+					ARM_IRQ_SEC_SGI_3,		\
+					ARM_IRQ_SEC_SGI_4,		\
+					ARM_IRQ_SEC_SGI_5,		\
+					ARM_IRQ_SEC_SGI_7
+
+#define ARM_G0_IRQS			ARM_IRQ_SEC_SGI_0,		\
+					ARM_IRQ_SEC_SGI_6
+
 #define ARM_SHARED_RAM_ATTR		((PLAT_ARM_SHARED_RAM_CACHED ?	\
 						MT_MEMORY : MT_DEVICE)	\
 						| MT_RW | MT_SECURE)
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index aadf58d8..f0b3ff67 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -37,7 +37,6 @@
 #include <stdint.h>
 #include <xlat_tables.h>
 
-
 /*
  * Extern declarations common to ARM standard platforms
  */
@@ -179,7 +178,11 @@ void arm_tsp_early_platform_setup(void);
 /*
  * Mandatory functions required in ARM standard platforms
  */
+void plat_arm_gic_driver_init(void);
 void plat_arm_gic_init(void);
+void plat_arm_gic_cpuif_enable(void);
+void plat_arm_gic_cpuif_disable(void);
+void plat_arm_gic_pcpu_init(void);
 void plat_arm_security_setup(void);
 void plat_arm_pwrc_setup(void);
 
diff --git a/include/plat/arm/css/common/aarch64/css_macros.S b/include/plat/arm/css/common/aarch64/css_macros.S
index 2a26eb70..9f18e09c 100644
--- a/include/plat/arm/css/common/aarch64/css_macros.S
+++ b/include/plat/arm/css/common/aarch64/css_macros.S
@@ -41,8 +41,8 @@
 	 * ---------------------------------------------
 	 */
 	.macro plat_print_gic_regs
-	mov_imm	x16, PLAT_CSS_GICD_BASE
-	mov_imm	x17, PLAT_CSS_GICC_BASE
+	mov_imm	x16, PLAT_ARM_GICD_BASE
+	mov_imm	x17, PLAT_ARM_GICC_BASE
 	arm_print_gic_regs
 	.endm
 
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index 98b69cb3..99491f88 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -61,6 +61,16 @@
 #define CSS_IRQ_SEC_SYS_TIMER		91
 
 /*
+ * Define a list of Group 1 Secure interrupts as per GICv3 terminology. On a
+ * GICv2 system or mode, the interrupts will be treated as Group 0 interrupts.
+ */
+#define CSS_G1S_IRQS			CSS_IRQ_MHU,		\
+					CSS_IRQ_GPU_SMMU_0,	\
+					CSS_IRQ_TZC,		\
+					CSS_IRQ_TZ_WDOG,	\
+					CSS_IRQ_SEC_SYS_TIMER
+
+/*
  * SCP <=> AP boot configuration
  *
  * The SCP/AP boot configuration is a 32-bit word located at a known offset from