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/of_platform.h> 9 #include <linux/slab.h> 10 #include <linux/cdx/cdx_bus.h> 11 12 #include "cdx_controller.h" 13 #include "../cdx.h" 14 #include "mcdi_functions.h" 15 #include "mcdi.h" 16 17 static unsigned int cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd) 18 { 19 return MCDI_RPC_TIMEOUT; 20 } 21 22 static void cdx_mcdi_request(struct cdx_mcdi *cdx, 23 const struct cdx_dword *hdr, size_t hdr_len, 24 const struct cdx_dword *sdu, size_t sdu_len) 25 { 26 if (cdx_rpmsg_send(cdx, hdr, hdr_len, sdu, sdu_len)) 27 dev_err(&cdx->rpdev->dev, "Failed to send rpmsg data\n"); 28 } 29 30 static const struct cdx_mcdi_ops mcdi_ops = { 31 .mcdi_rpc_timeout = cdx_mcdi_rpc_timeout, 32 .mcdi_request = cdx_mcdi_request, 33 }; 34 35 void cdx_rpmsg_post_probe(struct cdx_controller *cdx) 36 { 37 /* Register CDX controller with CDX bus driver */ 38 if (cdx_register_controller(cdx)) 39 dev_err(cdx->dev, "Failed to register CDX controller\n"); 40 } 41 42 void cdx_rpmsg_pre_remove(struct cdx_controller *cdx) 43 { 44 cdx_unregister_controller(cdx); 45 cdx_mcdi_wait_for_quiescence(cdx->priv, MCDI_RPC_TIMEOUT); 46 } 47 48 static int cdx_scan_devices(struct cdx_controller *cdx) 49 { 50 struct cdx_mcdi *cdx_mcdi = cdx->priv; 51 u8 bus_num, dev_num, num_cdx_bus; 52 int ret; 53 54 /* MCDI FW Read: Fetch the number of CDX buses on this controller */ 55 ret = cdx_mcdi_get_num_buses(cdx_mcdi); 56 if (ret < 0) { 57 dev_err(cdx->dev, 58 "Get number of CDX buses failed: %d\n", ret); 59 return ret; 60 } 61 num_cdx_bus = (u8)ret; 62 63 for (bus_num = 0; bus_num < num_cdx_bus; bus_num++) { 64 u8 num_cdx_dev; 65 66 /* MCDI FW Read: Fetch the number of devices present */ 67 ret = cdx_mcdi_get_num_devs(cdx_mcdi, bus_num); 68 if (ret < 0) { 69 dev_err(cdx->dev, 70 "Get devices on CDX bus %d failed: %d\n", bus_num, ret); 71 continue; 72 } 73 num_cdx_dev = (u8)ret; 74 75 for (dev_num = 0; dev_num < num_cdx_dev; dev_num++) { 76 struct cdx_dev_params dev_params; 77 78 /* MCDI FW: Get the device config */ 79 ret = cdx_mcdi_get_dev_config(cdx_mcdi, bus_num, 80 dev_num, &dev_params); 81 if (ret) { 82 dev_err(cdx->dev, 83 "CDX device config get failed for %d(bus):%d(dev), %d\n", 84 bus_num, dev_num, ret); 85 continue; 86 } 87 dev_params.cdx = cdx; 88 89 /* Add the device to the cdx bus */ 90 ret = cdx_device_add(&dev_params); 91 if (ret) { 92 dev_err(cdx->dev, "registering cdx dev: %d failed: %d\n", 93 dev_num, ret); 94 continue; 95 } 96 97 dev_dbg(cdx->dev, "CDX dev: %d on cdx bus: %d created\n", 98 dev_num, bus_num); 99 } 100 } 101 102 return 0; 103 } 104 105 static struct cdx_ops cdx_ops = { 106 .scan = cdx_scan_devices, 107 }; 108 109 static int xlnx_cdx_probe(struct platform_device *pdev) 110 { 111 struct cdx_controller *cdx; 112 struct cdx_mcdi *cdx_mcdi; 113 int ret; 114 115 cdx_mcdi = kzalloc(sizeof(*cdx_mcdi), GFP_KERNEL); 116 if (!cdx_mcdi) 117 return -ENOMEM; 118 119 /* Store the MCDI ops */ 120 cdx_mcdi->mcdi_ops = &mcdi_ops; 121 /* MCDI FW: Initialize the FW path */ 122 ret = cdx_mcdi_init(cdx_mcdi); 123 if (ret) { 124 dev_err_probe(&pdev->dev, ret, "MCDI Initialization failed\n"); 125 goto mcdi_init_fail; 126 } 127 128 cdx = kzalloc(sizeof(*cdx), GFP_KERNEL); 129 if (!cdx) { 130 ret = -ENOMEM; 131 goto cdx_alloc_fail; 132 } 133 platform_set_drvdata(pdev, cdx); 134 135 cdx->dev = &pdev->dev; 136 cdx->priv = cdx_mcdi; 137 cdx->ops = &cdx_ops; 138 139 ret = cdx_setup_rpmsg(pdev); 140 if (ret) { 141 if (ret != -EPROBE_DEFER) 142 dev_err(&pdev->dev, "Failed to register CDX RPMsg transport\n"); 143 goto cdx_rpmsg_fail; 144 } 145 146 dev_info(&pdev->dev, "Successfully registered CDX controller with RPMsg as transport\n"); 147 return 0; 148 149 cdx_rpmsg_fail: 150 kfree(cdx); 151 cdx_alloc_fail: 152 cdx_mcdi_finish(cdx_mcdi); 153 mcdi_init_fail: 154 kfree(cdx_mcdi); 155 156 return ret; 157 } 158 159 static int xlnx_cdx_remove(struct platform_device *pdev) 160 { 161 struct cdx_controller *cdx = platform_get_drvdata(pdev); 162 struct cdx_mcdi *cdx_mcdi = cdx->priv; 163 164 cdx_destroy_rpmsg(pdev); 165 166 kfree(cdx); 167 168 cdx_mcdi_finish(cdx_mcdi); 169 kfree(cdx_mcdi); 170 171 return 0; 172 } 173 174 static const struct of_device_id cdx_match_table[] = { 175 {.compatible = "xlnx,versal-net-cdx",}, 176 { }, 177 }; 178 179 MODULE_DEVICE_TABLE(of, cdx_match_table); 180 181 static struct platform_driver cdx_pdriver = { 182 .driver = { 183 .name = "cdx-controller", 184 .pm = NULL, 185 .of_match_table = cdx_match_table, 186 }, 187 .probe = xlnx_cdx_probe, 188 .remove = xlnx_cdx_remove, 189 }; 190 191 static int __init cdx_controller_init(void) 192 { 193 int ret; 194 195 ret = platform_driver_register(&cdx_pdriver); 196 if (ret) 197 pr_err("platform_driver_register() failed: %d\n", ret); 198 199 return ret; 200 } 201 202 static void __exit cdx_controller_exit(void) 203 { 204 platform_driver_unregister(&cdx_pdriver); 205 } 206 207 module_init(cdx_controller_init); 208 module_exit(cdx_controller_exit); 209 210 MODULE_AUTHOR("AMD Inc."); 211 MODULE_DESCRIPTION("CDX controller for AMD devices"); 212 MODULE_LICENSE("GPL"); 213