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