gic/gic600: add support for multichip configuration

Add support to configure GIC-600's multichip routing table registers.
Introduce a new gic600 multichip structure in order to support platforms
to pass their GIC-600 multichip information such as routing table owner,
SPI blocks ownership.

This driver is currently experimental and the driver api may change in
the future.

Change-Id: Id409d0bc07843e271ead3fc2f6e3cb38b317878d
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/include/drivers/arm/gic600_multichip.h b/include/drivers/arm/gic600_multichip.h
new file mode 100644
index 000000000..bda406bba
--- /dev/null
+++ b/include/drivers/arm/gic600_multichip.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2019, ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef GIC600_MULTICHIP_H
+#define GIC600_MULTICHIP_H
+
+#include <stdint.h>
+
+/*
+ * GIC-600 microarchitecture supports coherent multichip environments containing
+ * up to 16 chips.
+ */
+#define GIC600_MAX_MULTICHIP	16
+
+/* SPI IDs array consist of min and max ids */
+#define GIC600_SPI_IDS_SIZE	2
+
+/*******************************************************************************
+ * GIC-600 multichip data structure describes platform specific attributes
+ * related to GIC-600 multichip. Platform port is expected to define these
+ * attributes to initialize the multichip related registers and create
+ * successful connections between the GIC-600s in a multichip system.
+ *
+ * The 'rt_owner_base' field contains the base address of the GIC Distributor
+ * which owns the routing table.
+ *
+ * The 'rt_owner' field contains the chip number which owns the routing table.
+ * Chip number or chip_id starts from 0.
+ *
+ * The 'chip_count' field contains the total number of chips in a multichip
+ * system. This should match the number of entries in 'chip_addrs' and 'spi_ids'
+ * fields.
+ *
+ * The 'chip_addrs' field contains array of chip addresses. These addresses are
+ * implementation specific values.
+ *
+ * The 'spi_ids' field contains array of minimum and maximum SPI interrupt ids
+ * that each chip owns. Note that SPI interrupt ids can range from 32 to 960 and
+ * it should be group of 32 (i.e., SPI minimum and (SPI maximum + 1) should be
+ * a multiple of 32). If a chip doesn't own any SPI interrupts a value of {0, 0}
+ * should be passed.
+ ******************************************************************************/
+struct gic600_multichip_data {
+	uintptr_t rt_owner_base;
+	unsigned int rt_owner;
+	unsigned int chip_count;
+	uint64_t chip_addrs[GIC600_MAX_MULTICHIP];
+	unsigned int spi_ids[GIC600_MAX_MULTICHIP][GIC600_SPI_IDS_SIZE];
+};
+
+void gic600_multichip_init(struct gic600_multichip_data *multichip_data);
+#endif /* GIC600_MULTICHIP_H */