1// SPDX-License-Identifier: GPL-2.0
2/*
3 * CDX host controller driver for AMD versal-net platform.
4 *
5 * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
6 */
7
8#include <linux/mod_devicetable.h>
9#include <linux/platform_device.h>
10#include <linux/slab.h>
11#include <linux/cdx/cdx_bus.h>
12#include <linux/irqdomain.h>
13
14#include "cdx_controller.h"
15#include "../cdx.h"
16#include "mcdi_functions.h"
17#include "mcdid.h"
18
19static unsigned int cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd)
20{
21 return MCDI_RPC_TIMEOUT;
22}
23
24static void cdx_mcdi_request(struct cdx_mcdi *cdx,
25 const struct cdx_dword *hdr, size_t hdr_len,
26 const struct cdx_dword *sdu, size_t sdu_len)
27{
28 if (cdx_rpmsg_send(cdx_mcdi: cdx, hdr, hdr_len, sdu, sdu_len))
29 dev_err(&cdx->rpdev->dev, "Failed to send rpmsg data\n");
30}
31
32static const struct cdx_mcdi_ops mcdi_ops = {
33 .mcdi_rpc_timeout = cdx_mcdi_rpc_timeout,
34 .mcdi_request = cdx_mcdi_request,
35};
36
37static int cdx_bus_enable(struct cdx_controller *cdx, u8 bus_num)
38{
39 return cdx_mcdi_bus_enable(cdx: cdx->priv, bus_num);
40}
41
42static int cdx_bus_disable(struct cdx_controller *cdx, u8 bus_num)
43{
44 return cdx_mcdi_bus_disable(cdx: cdx->priv, bus_num);
45}
46
47void cdx_rpmsg_post_probe(struct cdx_controller *cdx)
48{
49 /* Register CDX controller with CDX bus driver */
50 if (cdx_register_controller(cdx))
51 dev_err(cdx->dev, "Failed to register CDX controller\n");
52}
53
54void cdx_rpmsg_pre_remove(struct cdx_controller *cdx)
55{
56 cdx_unregister_controller(cdx);
57 cdx_mcdi_wait_for_quiescence(cdx: cdx->priv, MCDI_RPC_TIMEOUT);
58}
59
60static int cdx_configure_device(struct cdx_controller *cdx,
61 u8 bus_num, u8 dev_num,
62 struct cdx_device_config *dev_config)
63{
64 u16 msi_index;
65 int ret = 0;
66 u32 data;
67 u64 addr;
68
69 switch (dev_config->type) {
70 case CDX_DEV_MSI_CONF:
71 msi_index = dev_config->msi.msi_index;
72 data = dev_config->msi.data;
73 addr = dev_config->msi.addr;
74
75 ret = cdx_mcdi_write_msi(cdx: cdx->priv, bus_num, dev_num, msi_vector: msi_index, msi_address: addr, msi_data: data);
76 break;
77 case CDX_DEV_RESET_CONF:
78 ret = cdx_mcdi_reset_device(cdx: cdx->priv, bus_num, dev_num);
79 break;
80 case CDX_DEV_BUS_MASTER_CONF:
81 ret = cdx_mcdi_bus_master_enable(cdx: cdx->priv, bus_num, dev_num,
82 enable: dev_config->bus_master_enable);
83 break;
84 case CDX_DEV_MSI_ENABLE:
85 ret = cdx_mcdi_msi_enable(cdx: cdx->priv, bus_num, dev_num, enable: dev_config->msi_enable);
86 break;
87 default:
88 ret = -EINVAL;
89 }
90
91 return ret;
92}
93
94static int cdx_scan_devices(struct cdx_controller *cdx)
95{
96 struct cdx_mcdi *cdx_mcdi = cdx->priv;
97 u8 bus_num, dev_num, num_cdx_bus;
98 int ret;
99
100 /* MCDI FW Read: Fetch the number of CDX buses on this controller */
101 ret = cdx_mcdi_get_num_buses(cdx: cdx_mcdi);
102 if (ret < 0) {
103 dev_err(cdx->dev,
104 "Get number of CDX buses failed: %d\n", ret);
105 return ret;
106 }
107 num_cdx_bus = (u8)ret;
108
109 for (bus_num = 0; bus_num < num_cdx_bus; bus_num++) {
110 struct device *bus_dev;
111 u8 num_cdx_dev;
112
113 /* Add the bus on cdx subsystem */
114 bus_dev = cdx_bus_add(cdx, bus_num);
115 if (!bus_dev)
116 continue;
117
118 /* MCDI FW Read: Fetch the number of devices present */
119 ret = cdx_mcdi_get_num_devs(cdx: cdx_mcdi, bus_num);
120 if (ret < 0) {
121 dev_err(cdx->dev,
122 "Get devices on CDX bus %d failed: %d\n", bus_num, ret);
123 continue;
124 }
125 num_cdx_dev = (u8)ret;
126
127 for (dev_num = 0; dev_num < num_cdx_dev; dev_num++) {
128 struct cdx_dev_params dev_params;
129
130 /* MCDI FW: Get the device config */
131 ret = cdx_mcdi_get_dev_config(cdx: cdx_mcdi, bus_num,
132 dev_num, dev_params: &dev_params);
133 if (ret) {
134 dev_err(cdx->dev,
135 "CDX device config get failed for %d(bus):%d(dev), %d\n",
136 bus_num, dev_num, ret);
137 continue;
138 }
139 dev_params.cdx = cdx;
140 dev_params.parent = bus_dev;
141
142 /* Add the device to the cdx bus */
143 ret = cdx_device_add(dev_params: &dev_params);
144 if (ret) {
145 dev_err(cdx->dev, "registering cdx dev: %d failed: %d\n",
146 dev_num, ret);
147 continue;
148 }
149
150 dev_dbg(cdx->dev, "CDX dev: %d on cdx bus: %d created\n",
151 dev_num, bus_num);
152 }
153 }
154
155 return 0;
156}
157
158static struct cdx_ops cdx_ops = {
159 .bus_enable = cdx_bus_enable,
160 .bus_disable = cdx_bus_disable,
161 .scan = cdx_scan_devices,
162 .dev_configure = cdx_configure_device,
163};
164
165static int xlnx_cdx_probe(struct platform_device *pdev)
166{
167 struct cdx_controller *cdx;
168 struct cdx_mcdi *cdx_mcdi;
169 int ret;
170
171 cdx_mcdi = kzalloc(sizeof(*cdx_mcdi), GFP_KERNEL);
172 if (!cdx_mcdi)
173 return -ENOMEM;
174
175 /* Store the MCDI ops */
176 cdx_mcdi->mcdi_ops = &mcdi_ops;
177 /* MCDI FW: Initialize the FW path */
178 ret = cdx_mcdi_init(cdx: cdx_mcdi);
179 if (ret) {
180 dev_err_probe(dev: &pdev->dev, err: ret, fmt: "MCDI Initialization failed\n");
181 goto mcdi_init_fail;
182 }
183
184 cdx = kzalloc(sizeof(*cdx), GFP_KERNEL);
185 if (!cdx) {
186 ret = -ENOMEM;
187 goto cdx_alloc_fail;
188 }
189 platform_set_drvdata(pdev, data: cdx);
190
191 cdx->dev = &pdev->dev;
192 cdx->priv = cdx_mcdi;
193 cdx->ops = &cdx_ops;
194
195 /* Create MSI domain */
196 if (IS_ENABLED(CONFIG_GENERIC_MSI_IRQ))
197 cdx->msi_domain = cdx_msi_domain_init(dev: &pdev->dev);
198 if (!cdx->msi_domain) {
199 ret = dev_err_probe(dev: &pdev->dev, err: -ENODEV, fmt: "cdx_msi_domain_init() failed");
200 goto cdx_msi_fail;
201 }
202
203 ret = cdx_setup_rpmsg(pdev);
204 if (ret) {
205 dev_err_probe(dev: &pdev->dev, err: ret, fmt: "Failed to register CDX RPMsg transport\n");
206 goto cdx_rpmsg_fail;
207 }
208
209 return 0;
210
211cdx_rpmsg_fail:
212 irq_domain_remove(domain: cdx->msi_domain);
213cdx_msi_fail:
214 kfree(objp: cdx);
215cdx_alloc_fail:
216 cdx_mcdi_finish(cdx: cdx_mcdi);
217mcdi_init_fail:
218 kfree(objp: cdx_mcdi);
219
220 return ret;
221}
222
223static void xlnx_cdx_remove(struct platform_device *pdev)
224{
225 struct cdx_controller *cdx = platform_get_drvdata(pdev);
226 struct cdx_mcdi *cdx_mcdi = cdx->priv;
227
228 cdx_destroy_rpmsg(pdev);
229
230 irq_domain_remove(domain: cdx->msi_domain);
231 kfree(objp: cdx);
232
233 cdx_mcdi_finish(cdx: cdx_mcdi);
234 kfree(objp: cdx_mcdi);
235}
236
237static const struct of_device_id cdx_match_table[] = {
238 {.compatible = "xlnx,versal-net-cdx",},
239 { },
240};
241
242MODULE_DEVICE_TABLE(of, cdx_match_table);
243
244static struct platform_driver cdx_pdriver = {
245 .driver = {
246 .name = "cdx-controller",
247 .of_match_table = cdx_match_table,
248 },
249 .probe = xlnx_cdx_probe,
250 .remove = xlnx_cdx_remove,
251};
252
253module_platform_driver(cdx_pdriver);
254
255MODULE_AUTHOR("AMD Inc.");
256MODULE_DESCRIPTION("CDX controller for AMD devices");
257MODULE_LICENSE("GPL");
258MODULE_IMPORT_NS("CDX_BUS_CONTROLLER");
259

source code of linux/drivers/cdx/controller/cdx_controller.c