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authorJeremy Linton <jeremy.linton@arm.com>2020-11-18 10:12:41 -0600
committerManish Pandey <manish.pandey2@arm.com>2021-05-25 14:49:01 +0200
commitc7a28aa7988be1664a7c06726bd3ff9acfa19e29 (patch)
treeda9c41da73192b6902dc91761007cc7cf709421e
parent475333c8a9bf027dfb64dff7fe61fd0729548d2a (diff)
downloadtrusted-firmware-a-c7a28aa7988be1664a7c06726bd3ff9acfa19e29.tar.gz
SMCCC/PCI: Add initial PCI conduit definitions
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
-rw-r--r--include/services/pci_svc.h59
-rw-r--r--make_helpers/defaults.mk3
2 files changed, 62 insertions, 0 deletions
diff --git a/include/services/pci_svc.h b/include/services/pci_svc.h
new file mode 100644
index 0000000000..664a742c61
--- /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 */
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index 8d0cd04774..0433123720 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -212,6 +212,9 @@ SDEI_SUPPORT := 0
# True Random Number firmware Interface
TRNG_SUPPORT := 0
+# SMCCC PCI support
+SMC_PCI_SUPPORT := 0
+
# Whether code and read-only data should be put on separate memory pages. The
# platform Makefile is free to override this value.
SEPARATE_CODE_AND_RODATA := 0