1 /* 2 * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef PCI_SVC_H 8 #define PCI_SVC_H 9 10 #include <lib/utils_def.h> 11 12 /* SMCCC PCI platform functions */ 13 #define SMC_PCI_VERSION U(0x84000130) 14 #define SMC_PCI_FEATURES U(0x84000131) 15 #define SMC_PCI_READ U(0x84000132) 16 #define SMC_PCI_WRITE U(0x84000133) 17 #define SMC_PCI_SEG_INFO U(0x84000134) 18 19 #define is_pci_fid(_fid) (((_fid) >= SMC_PCI_VERSION) && \ 20 ((_fid) <= SMC_PCI_SEG_INFO)) 21 22 uint64_t pci_smc_handler(uint32_t smc_fid, u_register_t x1, u_register_t x2, 23 u_register_t x3, u_register_t x4, void *cookie, 24 void *handle, u_register_t flags); 25 26 #define PCI_ADDR_FUN(dev) ((dev) & U(0x7)) 27 #define PCI_ADDR_DEV(dev) (((dev) >> U(3)) & U(0x001F)) 28 #define PCI_ADDR_BUS(dev) (((dev) >> U(8)) & U(0x00FF)) 29 #define PCI_ADDR_SEG(dev) (((dev) >> U(16)) & U(0xFFFF)) 30 #define PCI_OFFSET_MASK U(0xFFF) 31 typedef union { 32 struct { 33 uint16_t minor; 34 uint16_t major; 35 } __packed; 36 uint32_t val; 37 } pcie_version; 38 39 /* 40 * platforms are responsible for providing implementations of these 41 * three functions in a manner which conforms to the Arm PCI Configuration 42 * Space Access Firmware Interface (DEN0115) and the PCIe specification's 43 * sections on PCI configuration access. See the rpi4_pci_svc.c example. 44 */ 45 uint32_t pci_read_config(uint32_t addr, uint32_t off, uint32_t sz, uint32_t *val); 46 uint32_t pci_write_config(uint32_t addr, uint32_t off, uint32_t sz, uint32_t val); 47 uint32_t pci_get_bus_for_seg(uint32_t seg, uint32_t *bus_range, uint32_t *nseg); 48 49 /* Return codes for Arm PCI Config Space Access Firmware SMC calls */ 50 #define SMC_PCI_CALL_SUCCESS U(0) 51 #define SMC_PCI_CALL_NOT_SUPPORTED -1 52 #define SMC_PCI_CALL_INVAL_PARAM -2 53 #define SMC_PCI_CALL_NOT_IMPL -3 54 55 #define SMC_PCI_SZ_8BIT U(1) 56 #define SMC_PCI_SZ_16BIT U(2) 57 #define SMC_PCI_SZ_32BIT U(4) 58 59 #endif /* PCI_SVC_H */ 60