xref: /openbmc/qemu/hw/cxl/switch-mailbox-cci.c (revision 2e1cacfb) 
1 /*
2  * SPDX-License-Identifier: GPL-2.0-or-later
3  *
4  * Emulation of a CXL Switch Mailbox CCI PCIe function.
5  *
6  * Copyright (c) 2023 Huawei Technologies.
7  *
8  * From www.computeexpresslink.org
9  * Compute Express Link (CXL) Specification revision 3.0 Version 1.0
10  */
11 #include "qemu/osdep.h"
12 #include "hw/pci/pci.h"
13 #include "hw/pci-bridge/cxl_upstream_port.h"
14 #include "qapi/error.h"
15 #include "qemu/log.h"
16 #include "qemu/module.h"
17 #include "hw/qdev-properties.h"
18 #include "hw/cxl/cxl.h"
19 
20 static void cswmbcci_reset(DeviceState *dev)
21 {
22     CSWMBCCIDev *cswmb = CXL_SWITCH_MAILBOX_CCI(dev);
23     cxl_device_register_init_swcci(cswmb);
24 }
25 
26 static void cswbcci_realize(PCIDevice *pci_dev, Error **errp)
27 {
28     CSWMBCCIDev *cswmb = CXL_SWITCH_MAILBOX_CCI(pci_dev);
29     CXLComponentState *cxl_cstate = &cswmb->cxl_cstate;
30     CXLDeviceState *cxl_dstate = &cswmb->cxl_dstate;
31     CXLDVSECRegisterLocator *regloc_dvsec;
32     CXLUpstreamPort *usp;
33 
34     if (!cswmb->target) {
35         error_setg(errp, "Target not set");
36         return;
37     }
38     usp = CXL_USP(cswmb->target);
39 
40     pcie_endpoint_cap_init(pci_dev, 0x80);
41     cxl_cstate->dvsec_offset = 0x100;
42     cxl_cstate->pdev = pci_dev;
43     cswmb->cci = &usp->swcci;
44     cxl_device_register_block_init(OBJECT(pci_dev), cxl_dstate, cswmb->cci);
45     pci_register_bar(pci_dev, 0,
46                      PCI_BASE_ADDRESS_SPACE_MEMORY |
47                          PCI_BASE_ADDRESS_MEM_TYPE_64,
48                      &cxl_dstate->device_registers);
49     regloc_dvsec = &(CXLDVSECRegisterLocator) {
50         .rsvd         = 0,
51         .reg0_base_lo = RBI_CXL_DEVICE_REG | 0,
52         .reg0_base_hi = 0,
53     };
54     cxl_component_create_dvsec(cxl_cstate, CXL3_SWITCH_MAILBOX_CCI,
55                                REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC,
56                                REG_LOC_DVSEC_REVID, (uint8_t *)regloc_dvsec);
57 
58     cxl_initialize_mailbox_swcci(cswmb->cci, DEVICE(pci_dev),
59                                  DEVICE(cswmb->target),
60                                  CXL_MAILBOX_MAX_PAYLOAD_SIZE);
61 }
62 
63 static void cswmbcci_exit(PCIDevice *pci_dev)
64 {
65     /* Nothing to do here yet */
66 }
67 
68 static Property cxl_switch_cci_props[] = {
69     DEFINE_PROP_LINK("target", CSWMBCCIDev,
70                      target, TYPE_CXL_USP, PCIDevice *),
71     DEFINE_PROP_END_OF_LIST(),
72 };
73 
74 static void cswmbcci_class_init(ObjectClass *oc, void *data)
75 {
76     DeviceClass *dc = DEVICE_CLASS(oc);
77     PCIDeviceClass *pc = PCI_DEVICE_CLASS(oc);
78 
79     pc->realize = cswbcci_realize;
80     pc->exit = cswmbcci_exit;
81     /* Serial bus, CXL Switch CCI */
82     pc->class_id = 0x0c0b;
83     /*
84      * Huawei Technologies
85      * CXL Switch Mailbox CCI - DID assigned for emulation only.
86      * No real hardware will ever use this ID.
87      */
88     pc->vendor_id = 0x19e5;
89     pc->device_id = 0xa123;
90     pc->revision = 0;
91     dc->desc = "CXL Switch Mailbox CCI";
92     device_class_set_legacy_reset(dc, cswmbcci_reset);
93     device_class_set_props(dc, cxl_switch_cci_props);
94 }
95 
96 static const TypeInfo cswmbcci_info = {
97     .name = TYPE_CXL_SWITCH_MAILBOX_CCI,
98     .parent = TYPE_PCI_DEVICE,
99     .class_init = cswmbcci_class_init,
100     .instance_size = sizeof(CSWMBCCIDev),
101     .interfaces = (InterfaceInfo[]) {
102         { INTERFACE_PCIE_DEVICE },
103         { }
104     },
105 };
106 
107 static void cxl_switch_mailbox_cci_register(void)
108 {
109     type_register_static(&cswmbcci_info);
110 }
111 type_init(cxl_switch_mailbox_cci_register);
112