Refactor fvp gic code to be a generic driver

Refactor the FVP gic code in plat/fvp/fvp_gic.c to be a generic ARM
GIC driver in drivers/arm/gic/arm_gic.c. Provide the platform
specific inputs in the arm_gic_setup() function so that the driver
has no explicit dependency on platform code.

Provide weak implementations of the platform interrupt controller
API in a new file, plat/common/plat_gic.c. These simply call through
to the ARM GIC driver.

Move the only remaining FVP GIC function, fvp_gic_init() to
plat/fvp/aarch64/fvp_common.c and remove plat/fvp/fvp_gic.c

Fixes ARM-software/tf-issues#182

Change-Id: Iea82fe095fad62dd33ba9efbddd48c57717edd21

2 files changed, 61 insertions, 0 deletions

diff --git a/include/drivers/arm/arm_gic.h b/include/drivers/arm/arm_gic.h
new file mode 100644
index 00000000..9ab1a959
--- /dev/null
+++ b/include/drivers/arm/arm_gic.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __ARM_GIC_H__
+#define __ARM_GIC_H__
+
+#include <stdint.h>
+
+/*******************************************************************************
+ * Function declarations
+ ******************************************************************************/
+void arm_gic_init(unsigned int gicc_base,
+		unsigned int gicd_base,
+		unsigned long gicr_base,
+		const unsigned int *irq_sec_ptr,
+		unsigned int num_irqs);
+void arm_gic_setup(void);
+void arm_gic_cpuif_deactivate(void);
+void arm_gic_cpuif_setup(void);
+void arm_gic_pcpu_distif_setup(void);
+
+uint32_t arm_gic_interrupt_type_to_line(uint32_t type,
+				uint32_t security_state);
+uint32_t arm_gic_get_pending_interrupt_type(void);
+uint32_t arm_gic_get_pending_interrupt_id(void);
+uint32_t arm_gic_acknowledge_interrupt(void);
+void arm_gic_end_of_interrupt(uint32_t id);
+uint32_t arm_gic_get_interrupt_type(uint32_t id);
+
+#endif /* __GIC_H__ */
diff --git a/include/drivers/arm/gic_v2.h b/include/drivers/arm/gic_v2.h
index 1859a8eb..4c6b0dcc 100644
--- a/include/drivers/arm/gic_v2.h
+++ b/include/drivers/arm/gic_v2.h
@@ -36,6 +36,10 @@
 #define MAX_PPIS		14
 #define MAX_SGIS		16
 
+#define MIN_SGI_ID		0
+#define MIN_PPI_ID		16
+#define MIN_SPI_ID		32
+
 #define GRP0			0
 #define GRP1			1
 #define GIC_PRI_MASK		0xff