drivers/cdx/controller/cdx_controller.c

   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 "mcdi.h"
  18
  19 static unsigned int cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd)
  20 {
  21         return MCDI_RPC_TIMEOUT;
  22 }
  23
  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)
  27 {
  28         if (cdx_rpmsg_send(cdx, hdr, hdr_len, sdu, sdu_len))
  29                 dev_err(&cdx->rpdev->dev, "Failed to send rpmsg data\n");
  30 }
  31
  32 static const struct cdx_mcdi_ops mcdi_ops = {
  33         .mcdi_rpc_timeout = cdx_mcdi_rpc_timeout,
  34         .mcdi_request = cdx_mcdi_request,
  35 };
  36
  37 static int cdx_bus_enable(struct cdx_controller *cdx, u8 bus_num)
  38 {
  39         return cdx_mcdi_bus_enable(cdx->priv, bus_num);
  40 }
  41
  42 static int cdx_bus_disable(struct cdx_controller *cdx, u8 bus_num)
  43 {
  44         return cdx_mcdi_bus_disable(cdx->priv, bus_num);
  45 }
  46
  47 void 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
  54 void cdx_rpmsg_pre_remove(struct cdx_controller *cdx)
  55 {
  56         cdx_unregister_controller(cdx);
  57         cdx_mcdi_wait_for_quiescence(cdx->priv, MCDI_RPC_TIMEOUT);
  58 }
  59
  60 static 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->priv, bus_num, dev_num, msi_index, addr, data);
  76                 break;
  77         case CDX_DEV_RESET_CONF:
  78                 ret = cdx_mcdi_reset_device(cdx->priv, bus_num, dev_num);
  79                 break;
  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);
  83                 break;
  84         case CDX_DEV_MSI_ENABLE:
  85                 ret = cdx_mcdi_msi_enable(cdx->priv, bus_num, dev_num, dev_config->msi_enable);
  86                 break;
  87         default:
  88                 ret = -EINVAL;
  89         }
  90
  91         return ret;
  92 }
  93
  94 static 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_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_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_mcdi, bus_num,
 132                                                       dev_num, &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);
 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
 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,
 163 };
 164
 165 static 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_mcdi);
 179         if (ret) {
 180                 dev_err_probe(&pdev->dev, ret, "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, cdx);
 190
 191         cdx->dev = &pdev->dev;
 192         cdx->priv = cdx_mcdi;
 193         cdx->ops = &cdx_ops;
 194
 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");
 199                 ret = -ENODEV;
 200                 goto cdx_msi_fail;
 201         }
 202
 203         ret = cdx_setup_rpmsg(pdev);
 204         if (ret) {
 205                 if (ret != -EPROBE_DEFER)
 206                         dev_err(&pdev->dev, "Failed to register CDX RPMsg transport\n");
 207                 goto cdx_rpmsg_fail;
 208         }
 209
 210         dev_info(&pdev->dev, "Successfully registered CDX controller with RPMsg as transport\n");
 211         return 0;
 212
 213 cdx_rpmsg_fail:
 214         irq_domain_remove(cdx->msi_domain);
 215 cdx_msi_fail:
 216         kfree(cdx);
 217 cdx_alloc_fail:
 218         cdx_mcdi_finish(cdx_mcdi);
 219 mcdi_init_fail:
 220         kfree(cdx_mcdi);
 221
 222         return ret;
 223 }
 224
 225 static int xlnx_cdx_remove(struct platform_device *pdev)
 226 {
 227         struct cdx_controller *cdx = platform_get_drvdata(pdev);
 228         struct cdx_mcdi *cdx_mcdi = cdx->priv;
 229
 230         cdx_destroy_rpmsg(pdev);
 231
 232         irq_domain_remove(cdx->msi_domain);
 233         kfree(cdx);
 234
 235         cdx_mcdi_finish(cdx_mcdi);
 236         kfree(cdx_mcdi);
 237
 238         return 0;
 239 }
 240
 241 static const struct of_device_id cdx_match_table[] = {
 242         {.compatible = "xlnx,versal-net-cdx",},
 243         { },
 244 };
 245
 246 MODULE_DEVICE_TABLE(of, cdx_match_table);
 247
 248 static struct platform_driver cdx_pdriver = {
 249         .driver = {
 250                    .name = "cdx-controller",
 251                    .pm = NULL,
 252                    .of_match_table = cdx_match_table,
 253                    },
 254         .probe = xlnx_cdx_probe,
 255         .remove = xlnx_cdx_remove,
 256 };
 257
 258 static int __init cdx_controller_init(void)
 259 {
 260         int ret;
 261
 262         ret = platform_driver_register(&cdx_pdriver);
 263         if (ret)
 264                 pr_err("platform_driver_register() failed: %d\n", ret);
 265
 266         return ret;
 267 }
 268
 269 static void __exit cdx_controller_exit(void)
 270 {
 271         platform_driver_unregister(&cdx_pdriver);
 272 }
 273
 274 module_init(cdx_controller_init);
 275 module_exit(cdx_controller_exit);
 276
 277 MODULE_AUTHOR("AMD Inc.");
 278 MODULE_DESCRIPTION("CDX controller for AMD devices");
 279 MODULE_LICENSE("GPL");
 280 MODULE_IMPORT_NS(CDX_BUS_CONTROLLER);