| Vijayenthiran Subramaniam | ad3fc76 | 2019-09-16 17:05:08 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2019, ARM Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #ifndef GIC600_MULTICHIP_H |
| 8 | #define GIC600_MULTICHIP_H |
| 9 | |
| 10 | #include <stdint.h> |
| 11 | |
| 12 | /* |
| 13 | * GIC-600 microarchitecture supports coherent multichip environments containing |
| 14 | * up to 16 chips. |
| 15 | */ |
| 16 | #define GIC600_MAX_MULTICHIP 16 |
| 17 | |
| 18 | /* SPI IDs array consist of min and max ids */ |
| 19 | #define GIC600_SPI_IDS_SIZE 2 |
| 20 | |
| 21 | /******************************************************************************* |
| 22 | * GIC-600 multichip data structure describes platform specific attributes |
| 23 | * related to GIC-600 multichip. Platform port is expected to define these |
| 24 | * attributes to initialize the multichip related registers and create |
| 25 | * successful connections between the GIC-600s in a multichip system. |
| 26 | * |
| 27 | * The 'rt_owner_base' field contains the base address of the GIC Distributor |
| 28 | * which owns the routing table. |
| 29 | * |
| 30 | * The 'rt_owner' field contains the chip number which owns the routing table. |
| 31 | * Chip number or chip_id starts from 0. |
| 32 | * |
| 33 | * The 'chip_count' field contains the total number of chips in a multichip |
| 34 | * system. This should match the number of entries in 'chip_addrs' and 'spi_ids' |
| 35 | * fields. |
| 36 | * |
| 37 | * The 'chip_addrs' field contains array of chip addresses. These addresses are |
| 38 | * implementation specific values. |
| 39 | * |
| 40 | * The 'spi_ids' field contains array of minimum and maximum SPI interrupt ids |
| 41 | * that each chip owns. Note that SPI interrupt ids can range from 32 to 960 and |
| 42 | * it should be group of 32 (i.e., SPI minimum and (SPI maximum + 1) should be |
| 43 | * a multiple of 32). If a chip doesn't own any SPI interrupts a value of {0, 0} |
| 44 | * should be passed. |
| 45 | ******************************************************************************/ |
| 46 | struct gic600_multichip_data { |
| 47 | uintptr_t rt_owner_base; |
| 48 | unsigned int rt_owner; |
| 49 | unsigned int chip_count; |
| 50 | uint64_t chip_addrs[GIC600_MAX_MULTICHIP]; |
| 51 | unsigned int spi_ids[GIC600_MAX_MULTICHIP][GIC600_SPI_IDS_SIZE]; |
| 52 | }; |
| 53 | |
| 54 | void gic600_multichip_init(struct gic600_multichip_data *multichip_data); |
| 55 | #endif /* GIC600_MULTICHIP_H */ |