1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for FPGA Device Feature List (DFL) PCIe device
4 *
5 * Copyright (C) 2017-2018 Intel Corporation, Inc.
6 *
7 * Authors:
8 * Zhang Yi <Yi.Z.Zhang@intel.com>
9 * Xiao Guangrong <guangrong.xiao@linux.intel.com>
10 * Joseph Grecco <joe.grecco@intel.com>
11 * Enno Luebbers <enno.luebbers@intel.com>
12 * Tim Whisonant <tim.whisonant@intel.com>
13 * Ananda Ravuri <ananda.ravuri@intel.com>
14 * Henry Mitchel <henry.mitchel@intel.com>
15 */
16
17#include <linux/pci.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/stddef.h>
22#include <linux/errno.h>
23#include <linux/aer.h>
24
25#include "dfl.h"
26
27#define DRV_VERSION "0.8"
28#define DRV_NAME "dfl-pci"
29
30struct cci_drvdata {
31 struct dfl_fpga_cdev *cdev; /* container device */
32};
33
34static void __iomem *cci_pci_ioremap_bar(struct pci_dev *pcidev, int bar)
35{
36 if (pcim_iomap_regions(pcidev, BIT(bar), DRV_NAME))
37 return NULL;
38
39 return pcim_iomap_table(pcidev)[bar];
40}
41
42/* PCI Device ID */
43#define PCIE_DEVICE_ID_PF_INT_5_X 0xBCBD
44#define PCIE_DEVICE_ID_PF_INT_6_X 0xBCC0
45#define PCIE_DEVICE_ID_PF_DSC_1_X 0x09C4
46/* VF Device */
47#define PCIE_DEVICE_ID_VF_INT_5_X 0xBCBF
48#define PCIE_DEVICE_ID_VF_INT_6_X 0xBCC1
49#define PCIE_DEVICE_ID_VF_DSC_1_X 0x09C5
50
51static struct pci_device_id cci_pcie_id_tbl[] = {
52 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_5_X),},
53 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_5_X),},
54 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_INT_6_X),},
55 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_INT_6_X),},
56 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_PF_DSC_1_X),},
57 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCIE_DEVICE_ID_VF_DSC_1_X),},
58 {0,}
59};
60MODULE_DEVICE_TABLE(pci, cci_pcie_id_tbl);
61
62static int cci_init_drvdata(struct pci_dev *pcidev)
63{
64 struct cci_drvdata *drvdata;
65
66 drvdata = devm_kzalloc(&pcidev->dev, sizeof(*drvdata), GFP_KERNEL);
67 if (!drvdata)
68 return -ENOMEM;
69
70 pci_set_drvdata(pcidev, drvdata);
71
72 return 0;
73}
74
75static void cci_remove_feature_devs(struct pci_dev *pcidev)
76{
77 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
78
79 /* remove all children feature devices */
80 dfl_fpga_feature_devs_remove(drvdata->cdev);
81}
82
83/* enumerate feature devices under pci device */
84static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
85{
86 struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
87 struct dfl_fpga_enum_info *info;
88 struct dfl_fpga_cdev *cdev;
89 resource_size_t start, len;
90 int port_num, bar, i, ret = 0;
91 void __iomem *base;
92 u32 offset;
93 u64 v;
94
95 /* allocate enumeration info via pci_dev */
96 info = dfl_fpga_enum_info_alloc(&pcidev->dev);
97 if (!info)
98 return -ENOMEM;
99
100 /* start to find Device Feature List from Bar 0 */
101 base = cci_pci_ioremap_bar(pcidev, 0);
102 if (!base) {
103 ret = -ENOMEM;
104 goto enum_info_free_exit;
105 }
106
107 /*
108 * PF device has FME and Ports/AFUs, and VF device only has one
109 * Port/AFU. Check them and add related "Device Feature List" info
110 * for the next step enumeration.
111 */
112 if (dfl_feature_is_fme(base)) {
113 start = pci_resource_start(pcidev, 0);
114 len = pci_resource_len(pcidev, 0);
115
116 dfl_fpga_enum_info_add_dfl(info, start, len, base);
117
118 /*
119 * find more Device Feature Lists (e.g. Ports) per information
120 * indicated by FME module.
121 */
122 v = readq(base + FME_HDR_CAP);
123 port_num = FIELD_GET(FME_CAP_NUM_PORTS, v);
124
125 WARN_ON(port_num > MAX_DFL_FPGA_PORT_NUM);
126
127 for (i = 0; i < port_num; i++) {
128 v = readq(base + FME_HDR_PORT_OFST(i));
129
130 /* skip ports which are not implemented. */
131 if (!(v & FME_PORT_OFST_IMP))
132 continue;
133
134 /*
135 * add Port's Device Feature List information for next
136 * step enumeration.
137 */
138 bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
139 offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
140 base = cci_pci_ioremap_bar(pcidev, bar);
141 if (!base)
142 continue;
143
144 start = pci_resource_start(pcidev, bar) + offset;
145 len = pci_resource_len(pcidev, bar) - offset;
146
147 dfl_fpga_enum_info_add_dfl(info, start, len,
148 base + offset);
149 }
150 } else if (dfl_feature_is_port(base)) {
151 start = pci_resource_start(pcidev, 0);
152 len = pci_resource_len(pcidev, 0);
153
154 dfl_fpga_enum_info_add_dfl(info, start, len, base);
155 } else {
156 ret = -ENODEV;
157 goto enum_info_free_exit;
158 }
159
160 /* start enumeration with prepared enumeration information */
161 cdev = dfl_fpga_feature_devs_enumerate(info);
162 if (IS_ERR(cdev)) {
163 dev_err(&pcidev->dev, "Enumeration failure\n");
164 ret = PTR_ERR(cdev);
165 goto enum_info_free_exit;
166 }
167
168 drvdata->cdev = cdev;
169
170enum_info_free_exit:
171 dfl_fpga_enum_info_free(info);
172
173 return ret;
174}
175
176static
177int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
178{
179 int ret;
180
181 ret = pcim_enable_device(pcidev);
182 if (ret < 0) {
183 dev_err(&pcidev->dev, "Failed to enable device %d.\n", ret);
184 return ret;
185 }
186
187 ret = pci_enable_pcie_error_reporting(pcidev);
188 if (ret && ret != -EINVAL)
189 dev_info(&pcidev->dev, "PCIE AER unavailable %d.\n", ret);
190
191 pci_set_master(pcidev);
192
193 if (!pci_set_dma_mask(pcidev, DMA_BIT_MASK(64))) {
194 ret = pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(64));
195 if (ret)
196 goto disable_error_report_exit;
197 } else if (!pci_set_dma_mask(pcidev, DMA_BIT_MASK(32))) {
198 ret = pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(32));
199 if (ret)
200 goto disable_error_report_exit;
201 } else {
202 ret = -EIO;
203 dev_err(&pcidev->dev, "No suitable DMA support available.\n");
204 goto disable_error_report_exit;
205 }
206
207 ret = cci_init_drvdata(pcidev);
208 if (ret) {
209 dev_err(&pcidev->dev, "Fail to init drvdata %d.\n", ret);
210 goto disable_error_report_exit;
211 }
212
213 ret = cci_enumerate_feature_devs(pcidev);
214 if (ret) {
215 dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
216 goto disable_error_report_exit;
217 }
218
219 return ret;
220
221disable_error_report_exit:
222 pci_disable_pcie_error_reporting(pcidev);
223 return ret;
224}
225
226static void cci_pci_remove(struct pci_dev *pcidev)
227{
228 cci_remove_feature_devs(pcidev);
229 pci_disable_pcie_error_reporting(pcidev);
230}
231
232static struct pci_driver cci_pci_driver = {
233 .name = DRV_NAME,
234 .id_table = cci_pcie_id_tbl,
235 .probe = cci_pci_probe,
236 .remove = cci_pci_remove,
237};
238
239module_pci_driver(cci_pci_driver);
240
241MODULE_DESCRIPTION("FPGA DFL PCIe Device Driver");
242MODULE_AUTHOR("Intel Corporation");
243MODULE_LICENSE("GPL v2");
244