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Diffstat (limited to '')
| -rw-r--r-- | include/services/pci_svc.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/include/services/pci_svc.h b/include/services/pci_svc.h new file mode 100644 index 0000000..664a742 --- /dev/null +++ b/include/services/pci_svc.h @@ -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 */ |