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SMCCC/PCI: Add initial PCI conduit definitions

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Add constants, structures and build definition for the
new standard SMCCC PCI conduit. These are documented
in DEN0115A.

https://developer.arm.com/documentation/den0115/latest

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Change-Id: If667800a26b9ae88626e8d895674c9c2e8c09658
This commit is contained in:
Jeremy Linton 2020-11-18 10:12:41 -06:00 • committed by Manish Pandey
parent 475333c8a9
commit c7a28aa798
2 changed files with 62 additions and 0 deletions
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59
include/services/pci_svc.h Normal file
View file

@ -0,0 +1,59 @@
/*
* Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef PCI_SVC_H
#define PCI_SVC_H
#include <lib/utils_def.h>
/* SMCCC PCI platform functions */
#define SMC_PCI_VERSION U(0x84000130)
#define SMC_PCI_FEATURES U(0x84000131)
#define SMC_PCI_READ U(0x84000132)
#define SMC_PCI_WRITE U(0x84000133)
#define SMC_PCI_SEG_INFO U(0x84000134)
#define is_pci_fid(_fid) (((_fid) >= SMC_PCI_VERSION) && \
((_fid) <= SMC_PCI_SEG_INFO))
uint64_t pci_smc_handler(uint32_t smc_fid, u_register_t x1, u_register_t x2,
u_register_t x3, u_register_t x4, void *cookie,
void *handle, u_register_t flags);
#define PCI_ADDR_FUN(dev) ((dev) & U(0x7))
#define PCI_ADDR_DEV(dev) (((dev) >> U(3)) & U(0x001F))
#define PCI_ADDR_BUS(dev) (((dev) >> U(8)) & U(0x00FF))
#define PCI_ADDR_SEG(dev) (((dev) >> U(16)) & U(0xFFFF))
#define PCI_OFFSET_MASK U(0xFFF)
typedef union {
struct {
uint16_t minor;
uint16_t major;
} __packed;
uint32_t val;
} pcie_version;
/*
* platforms are responsible for providing implementations of these
* three functions in a manner which conforms to the Arm PCI Configuration
* Space Access Firmware Interface (DEN0115) and the PCIe specification's
* sections on PCI configuration access. See the rpi4_pci_svc.c example.
*/
uint32_t pci_read_config(uint32_t addr, uint32_t off, uint32_t sz, uint32_t *val);
uint32_t pci_write_config(uint32_t addr, uint32_t off, uint32_t sz, uint32_t val);
uint32_t pci_get_bus_for_seg(uint32_t seg, uint32_t *bus_range, uint32_t *nseg);
/* Return codes for Arm PCI Config Space Access Firmware SMC calls */
#define SMC_PCI_CALL_SUCCESS U(0)
#define SMC_PCI_CALL_NOT_SUPPORTED -1
#define SMC_PCI_CALL_INVAL_PARAM -2
#define SMC_PCI_CALL_NOT_IMPL -3
#define SMC_PCI_SZ_8BIT U(1)
#define SMC_PCI_SZ_16BIT U(2)
#define SMC_PCI_SZ_32BIT U(4)
#endif /* PCI_SVC_H */

3
make_helpers/defaults.mk
View file

@ -212,6 +212,9 @@ SDEI_SUPPORT := 0
# True Random Number firmware Interface # True Random Number firmware Interface
TRNG_SUPPORT := 0 TRNG_SUPPORT := 0
# SMCCC PCI support
SMC_PCI_SUPPORT := 0
# Whether code and read-only data should be put on separate memory pages. The # Whether code and read-only data should be put on separate memory pages. The
# platform Makefile is free to override this value. # platform Makefile is free to override this value.
SEPARATE_CODE_AND_RODATA := 0 SEPARATE_CODE_AND_RODATA := 0