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