1 // SPDX-License-Identifier: GPL-2.0
3 * CDX host controller driver for AMD versal-net platform.
5 * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
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>
14 #include "cdx_controller.h"
16 #include "mcdi_functions.h"
19 static unsigned int cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd)
21 return MCDI_RPC_TIMEOUT;
24 static 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)
28 if (cdx_rpmsg_send(cdx, hdr, hdr_len, sdu, sdu_len))
29 dev_err(&cdx->rpdev->dev, "Failed to send rpmsg data\n");
32 static const struct cdx_mcdi_ops mcdi_ops = {
33 .mcdi_rpc_timeout = cdx_mcdi_rpc_timeout,
34 .mcdi_request = cdx_mcdi_request,
37 static int cdx_bus_enable(struct cdx_controller *cdx, u8 bus_num)
39 return cdx_mcdi_bus_enable(cdx->priv, bus_num);
42 static int cdx_bus_disable(struct cdx_controller *cdx, u8 bus_num)
44 return cdx_mcdi_bus_disable(cdx->priv, bus_num);
47 void cdx_rpmsg_post_probe(struct cdx_controller *cdx)
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");
54 void cdx_rpmsg_pre_remove(struct cdx_controller *cdx)
56 cdx_unregister_controller(cdx);
57 cdx_mcdi_wait_for_quiescence(cdx->priv, MCDI_RPC_TIMEOUT);
60 static int cdx_configure_device(struct cdx_controller *cdx,
61 u8 bus_num, u8 dev_num,
62 struct cdx_device_config *dev_config)
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;
75 ret = cdx_mcdi_write_msi(cdx->priv, bus_num, dev_num, msi_index, addr, data);
77 case CDX_DEV_RESET_CONF:
78 ret = cdx_mcdi_reset_device(cdx->priv, bus_num, dev_num);
80 case CDX_DEV_BUS_MASTER_CONF:
81 ret = cdx_mcdi_bus_master_enable(cdx->priv, bus_num, dev_num,
82 dev_config->bus_master_enable);
84 case CDX_DEV_MSI_ENABLE:
85 ret = cdx_mcdi_msi_enable(cdx->priv, bus_num, dev_num, dev_config->msi_enable);
94 static int cdx_scan_devices(struct cdx_controller *cdx)
96 struct cdx_mcdi *cdx_mcdi = cdx->priv;
97 u8 bus_num, dev_num, num_cdx_bus;
100 /* MCDI FW Read: Fetch the number of CDX buses on this controller */
101 ret = cdx_mcdi_get_num_buses(cdx_mcdi);
104 "Get number of CDX buses failed: %d\n", ret);
107 num_cdx_bus = (u8)ret;
109 for (bus_num = 0; bus_num < num_cdx_bus; bus_num++) {
110 struct device *bus_dev;
113 /* Add the bus on cdx subsystem */
114 bus_dev = cdx_bus_add(cdx, bus_num);
118 /* MCDI FW Read: Fetch the number of devices present */
119 ret = cdx_mcdi_get_num_devs(cdx_mcdi, bus_num);
122 "Get devices on CDX bus %d failed: %d\n", bus_num, ret);
125 num_cdx_dev = (u8)ret;
127 for (dev_num = 0; dev_num < num_cdx_dev; dev_num++) {
128 struct cdx_dev_params dev_params;
130 /* MCDI FW: Get the device config */
131 ret = cdx_mcdi_get_dev_config(cdx_mcdi, bus_num,
132 dev_num, &dev_params);
135 "CDX device config get failed for %d(bus):%d(dev), %d\n",
136 bus_num, dev_num, ret);
139 dev_params.cdx = cdx;
140 dev_params.parent = bus_dev;
142 /* Add the device to the cdx bus */
143 ret = cdx_device_add(&dev_params);
145 dev_err(cdx->dev, "registering cdx dev: %d failed: %d\n",
150 dev_dbg(cdx->dev, "CDX dev: %d on cdx bus: %d created\n",
158 static 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,
165 static int xlnx_cdx_probe(struct platform_device *pdev)
167 struct cdx_controller *cdx;
168 struct cdx_mcdi *cdx_mcdi;
171 cdx_mcdi = kzalloc(sizeof(*cdx_mcdi), GFP_KERNEL);
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_mcdi);
180 dev_err_probe(&pdev->dev, ret, "MCDI Initialization failed\n");
184 cdx = kzalloc(sizeof(*cdx), GFP_KERNEL);
189 platform_set_drvdata(pdev, cdx);
191 cdx->dev = &pdev->dev;
192 cdx->priv = cdx_mcdi;
195 /* Create MSI domain */
196 cdx->msi_domain = cdx_msi_domain_init(&pdev->dev);
197 if (!cdx->msi_domain) {
198 dev_err(&pdev->dev, "cdx_msi_domain_init() failed");
203 ret = cdx_setup_rpmsg(pdev);
205 if (ret != -EPROBE_DEFER)
206 dev_err(&pdev->dev, "Failed to register CDX RPMsg transport\n");
210 dev_info(&pdev->dev, "Successfully registered CDX controller with RPMsg as transport\n");
214 irq_domain_remove(cdx->msi_domain);
218 cdx_mcdi_finish(cdx_mcdi);
225 static int xlnx_cdx_remove(struct platform_device *pdev)
227 struct cdx_controller *cdx = platform_get_drvdata(pdev);
228 struct cdx_mcdi *cdx_mcdi = cdx->priv;
230 cdx_destroy_rpmsg(pdev);
232 irq_domain_remove(cdx->msi_domain);
235 cdx_mcdi_finish(cdx_mcdi);
241 static const struct of_device_id cdx_match_table[] = {
242 {.compatible = "xlnx,versal-net-cdx",},
246 MODULE_DEVICE_TABLE(of, cdx_match_table);
248 static struct platform_driver cdx_pdriver = {
250 .name = "cdx-controller",
252 .of_match_table = cdx_match_table,
254 .probe = xlnx_cdx_probe,
255 .remove = xlnx_cdx_remove,
258 static int __init cdx_controller_init(void)
262 ret = platform_driver_register(&cdx_pdriver);
264 pr_err("platform_driver_register() failed: %d\n", ret);
269 static void __exit cdx_controller_exit(void)
271 platform_driver_unregister(&cdx_pdriver);
274 module_init(cdx_controller_init);
275 module_exit(cdx_controller_exit);
277 MODULE_AUTHOR("AMD Inc.");
278 MODULE_DESCRIPTION("CDX controller for AMD devices");
279 MODULE_LICENSE("GPL");
280 MODULE_IMPORT_NS(CDX_BUS_CONTROLLER);