1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Platform UFS Host driver for Cadence controller 4 * 5 * Copyright (C) 2018 Cadence Design Systems, Inc. 6 * 7 * Authors: 8 * Jan Kotas <jank@cadence.com> 9 * 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/of.h> 17 #include <linux/time.h> 18 19 #include "ufshcd-pltfrm.h" 20 21 #define CDNS_UFS_REG_HCLKDIV 0xFC 22 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C 23 #define CDNS_UFS_MAX_L4_ATTRS 12 24 25 struct cdns_ufs_host { 26 /** 27 * cdns_ufs_dme_attr_val - for storing L4 attributes 28 */ 29 u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX_L4_ATTRS]; 30 }; 31 32 /** 33 * cdns_ufs_get_l4_attr - get L4 attributes on local side 34 * @hba: per adapter instance 35 * 36 */ 37 static void cdns_ufs_get_l4_attr(struct ufs_hba *hba) 38 { 39 struct cdns_ufs_host *host = ufshcd_get_variant(hba); 40 41 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID), 42 &host->cdns_ufs_dme_attr_val[0]); 43 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID), 44 &host->cdns_ufs_dme_attr_val[1]); 45 ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS), 46 &host->cdns_ufs_dme_attr_val[2]); 47 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID), 48 &host->cdns_ufs_dme_attr_val[3]); 49 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS), 50 &host->cdns_ufs_dme_attr_val[4]); 51 ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE), 52 &host->cdns_ufs_dme_attr_val[5]); 53 ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE), 54 &host->cdns_ufs_dme_attr_val[6]); 55 ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE), 56 &host->cdns_ufs_dme_attr_val[7]); 57 ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE), 58 &host->cdns_ufs_dme_attr_val[8]); 59 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND), 60 &host->cdns_ufs_dme_attr_val[9]); 61 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE), 62 &host->cdns_ufs_dme_attr_val[10]); 63 ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 64 &host->cdns_ufs_dme_attr_val[11]); 65 } 66 67 /** 68 * cdns_ufs_set_l4_attr - set L4 attributes on local side 69 * @hba: per adapter instance 70 * 71 */ 72 static void cdns_ufs_set_l4_attr(struct ufs_hba *hba) 73 { 74 struct cdns_ufs_host *host = ufshcd_get_variant(hba); 75 76 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0); 77 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID), 78 host->cdns_ufs_dme_attr_val[0]); 79 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID), 80 host->cdns_ufs_dme_attr_val[1]); 81 ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS), 82 host->cdns_ufs_dme_attr_val[2]); 83 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID), 84 host->cdns_ufs_dme_attr_val[3]); 85 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS), 86 host->cdns_ufs_dme_attr_val[4]); 87 ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE), 88 host->cdns_ufs_dme_attr_val[5]); 89 ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE), 90 host->cdns_ufs_dme_attr_val[6]); 91 ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE), 92 host->cdns_ufs_dme_attr_val[7]); 93 ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE), 94 host->cdns_ufs_dme_attr_val[8]); 95 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND), 96 host->cdns_ufs_dme_attr_val[9]); 97 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE), 98 host->cdns_ufs_dme_attr_val[10]); 99 ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 100 host->cdns_ufs_dme_attr_val[11]); 101 } 102 103 /** 104 * cdns_ufs_set_hclkdiv() - set HCLKDIV register value based on the core_clk. 105 * @hba: host controller instance 106 * 107 * Return: zero for success and non-zero for failure. 108 */ 109 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba) 110 { 111 struct ufs_clk_info *clki; 112 struct list_head *head = &hba->clk_list_head; 113 unsigned long core_clk_rate = 0; 114 u32 core_clk_div = 0; 115 116 if (list_empty(head)) 117 return 0; 118 119 list_for_each_entry(clki, head, list) { 120 if (IS_ERR_OR_NULL(clki->clk)) 121 continue; 122 if (!strcmp(clki->name, "core_clk")) 123 core_clk_rate = clk_get_rate(clki->clk); 124 } 125 126 if (!core_clk_rate) { 127 dev_err(hba->dev, "%s: unable to find core_clk rate\n", 128 __func__); 129 return -EINVAL; 130 } 131 132 core_clk_div = core_clk_rate / USEC_PER_SEC; 133 134 ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV); 135 /** 136 * Make sure the register was updated, 137 * UniPro layer will not work with an incorrect value. 138 */ 139 mb(); 140 141 return 0; 142 } 143 144 /** 145 * cdns_ufs_hce_enable_notify() - set HCLKDIV register 146 * @hba: host controller instance 147 * @status: notify stage (pre, post change) 148 * 149 * Return: zero for success and non-zero for failure. 150 */ 151 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba, 152 enum ufs_notify_change_status status) 153 { 154 if (status != PRE_CHANGE) 155 return 0; 156 157 return cdns_ufs_set_hclkdiv(hba); 158 } 159 160 /** 161 * cdns_ufs_hibern8_notify() - save and restore L4 attributes. 162 * @hba: host controller instance 163 * @cmd: UIC Command 164 * @status: notify stage (pre, post change) 165 */ 166 static void cdns_ufs_hibern8_notify(struct ufs_hba *hba, enum uic_cmd_dme cmd, 167 enum ufs_notify_change_status status) 168 { 169 if (status == PRE_CHANGE && cmd == UIC_CMD_DME_HIBER_ENTER) 170 cdns_ufs_get_l4_attr(hba); 171 if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT) 172 cdns_ufs_set_l4_attr(hba); 173 } 174 175 /** 176 * cdns_ufs_link_startup_notify() - handle link startup. 177 * @hba: host controller instance 178 * @status: notify stage (pre, post change) 179 * 180 * Return: zero for success and non-zero for failure. 181 */ 182 static int cdns_ufs_link_startup_notify(struct ufs_hba *hba, 183 enum ufs_notify_change_status status) 184 { 185 if (status != PRE_CHANGE) 186 return 0; 187 188 /* 189 * Some UFS devices have issues if LCC is enabled. 190 * So we are setting PA_Local_TX_LCC_Enable to 0 191 * before link startup which will make sure that both host 192 * and device TX LCC are disabled once link startup is 193 * completed. 194 */ 195 ufshcd_disable_host_tx_lcc(hba); 196 197 /* 198 * Disabling Autohibern8 feature in cadence UFS 199 * to mask unexpected interrupt trigger. 200 */ 201 hba->ahit = 0; 202 203 return 0; 204 } 205 206 /** 207 * cdns_ufs_init - performs additional ufs initialization 208 * @hba: host controller instance 209 * 210 * Return: status of initialization. 211 */ 212 static int cdns_ufs_init(struct ufs_hba *hba) 213 { 214 int status = 0; 215 struct cdns_ufs_host *host; 216 struct device *dev = hba->dev; 217 218 host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL); 219 220 if (!host) 221 return -ENOMEM; 222 ufshcd_set_variant(hba, host); 223 224 status = ufshcd_vops_phy_initialization(hba); 225 226 return status; 227 } 228 229 /** 230 * cdns_ufs_m31_16nm_phy_initialization - performs m31 phy initialization 231 * @hba: host controller instance 232 * 233 * Return: 0 (success). 234 */ 235 static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba) 236 { 237 u32 data; 238 239 /* Increase RX_Advanced_Min_ActivateTime_Capability */ 240 data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1); 241 data |= BIT(24); 242 ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1); 243 244 return 0; 245 } 246 247 static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = { 248 .name = "cdns-ufs-pltfm", 249 .init = cdns_ufs_init, 250 .hce_enable_notify = cdns_ufs_hce_enable_notify, 251 .link_startup_notify = cdns_ufs_link_startup_notify, 252 .hibern8_notify = cdns_ufs_hibern8_notify, 253 }; 254 255 static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = { 256 .name = "cdns-ufs-pltfm", 257 .init = cdns_ufs_init, 258 .hce_enable_notify = cdns_ufs_hce_enable_notify, 259 .link_startup_notify = cdns_ufs_link_startup_notify, 260 .phy_initialization = cdns_ufs_m31_16nm_phy_initialization, 261 .hibern8_notify = cdns_ufs_hibern8_notify, 262 }; 263 264 static const struct of_device_id cdns_ufs_of_match[] = { 265 { 266 .compatible = "cdns,ufshc", 267 .data = &cdns_ufs_pltfm_hba_vops, 268 }, 269 { 270 .compatible = "cdns,ufshc-m31-16nm", 271 .data = &cdns_ufs_m31_16nm_pltfm_hba_vops, 272 }, 273 { }, 274 }; 275 276 MODULE_DEVICE_TABLE(of, cdns_ufs_of_match); 277 278 /** 279 * cdns_ufs_pltfrm_probe - probe routine of the driver 280 * @pdev: pointer to platform device handle 281 * 282 * Return: zero for success and non-zero for failure. 283 */ 284 static int cdns_ufs_pltfrm_probe(struct platform_device *pdev) 285 { 286 int err; 287 const struct of_device_id *of_id; 288 struct ufs_hba_variant_ops *vops; 289 struct device *dev = &pdev->dev; 290 291 of_id = of_match_node(cdns_ufs_of_match, dev->of_node); 292 vops = (struct ufs_hba_variant_ops *)of_id->data; 293 294 /* Perform generic probe */ 295 err = ufshcd_pltfrm_init(pdev, vops); 296 if (err) 297 dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err); 298 299 return err; 300 } 301 302 /** 303 * cdns_ufs_pltfrm_remove - removes the ufs driver 304 * @pdev: pointer to platform device handle 305 * 306 * Return: 0 (success). 307 */ 308 static int cdns_ufs_pltfrm_remove(struct platform_device *pdev) 309 { 310 struct ufs_hba *hba = platform_get_drvdata(pdev); 311 312 ufshcd_remove(hba); 313 return 0; 314 } 315 316 static const struct dev_pm_ops cdns_ufs_dev_pm_ops = { 317 SET_SYSTEM_SLEEP_PM_OPS(ufshcd_system_suspend, ufshcd_system_resume) 318 SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL) 319 .prepare = ufshcd_suspend_prepare, 320 .complete = ufshcd_resume_complete, 321 }; 322 323 static struct platform_driver cdns_ufs_pltfrm_driver = { 324 .probe = cdns_ufs_pltfrm_probe, 325 .remove = cdns_ufs_pltfrm_remove, 326 .driver = { 327 .name = "cdns-ufshcd", 328 .pm = &cdns_ufs_dev_pm_ops, 329 .of_match_table = cdns_ufs_of_match, 330 }, 331 }; 332 333 module_platform_driver(cdns_ufs_pltfrm_driver); 334 335 MODULE_AUTHOR("Jan Kotas <jank@cadence.com>"); 336 MODULE_DESCRIPTION("Cadence UFS host controller platform driver"); 337 MODULE_LICENSE("GPL v2"); 338