drivers/scsi/ufs/cdns-pltfrm.c

   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/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/of.h>
  16 #include <linux/time.h>
  17
  18 #include "ufshcd-pltfrm.h"
  19
  20 #define CDNS_UFS_REG_HCLKDIV    0xFC
  21 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
  22 #define CDNS_UFS_MAX_L4_ATTRS 12
  23
  24 struct cdns_ufs_host {
  25         /**
  26          * cdns_ufs_dme_attr_val - for storing L4 attributes
  27          */
  28         u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX_L4_ATTRS];
  29 };
  30
  31 /**
  32  * cdns_ufs_get_l4_attr - get L4 attributes on local side
  33  * @hba: per adapter instance
  34  *
  35  */
  36 static void cdns_ufs_get_l4_attr(struct ufs_hba *hba)
  37 {
  38         struct cdns_ufs_host *host = ufshcd_get_variant(hba);
  39
  40         ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID),
  41                        &host->cdns_ufs_dme_attr_val[0]);
  42         ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID),
  43                        &host->cdns_ufs_dme_attr_val[1]);
  44         ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
  45                        &host->cdns_ufs_dme_attr_val[2]);
  46         ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID),
  47                        &host->cdns_ufs_dme_attr_val[3]);
  48         ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS),
  49                        &host->cdns_ufs_dme_attr_val[4]);
  50         ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
  51                        &host->cdns_ufs_dme_attr_val[5]);
  52         ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
  53                        &host->cdns_ufs_dme_attr_val[6]);
  54         ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
  55                        &host->cdns_ufs_dme_attr_val[7]);
  56         ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
  57                        &host->cdns_ufs_dme_attr_val[8]);
  58         ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
  59                        &host->cdns_ufs_dme_attr_val[9]);
  60         ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE),
  61                        &host->cdns_ufs_dme_attr_val[10]);
  62         ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
  63                        &host->cdns_ufs_dme_attr_val[11]);
  64 }
  65
  66 /**
  67  * cdns_ufs_set_l4_attr - set L4 attributes on local side
  68  * @hba: per adapter instance
  69  *
  70  */
  71 static void cdns_ufs_set_l4_attr(struct ufs_hba *hba)
  72 {
  73         struct cdns_ufs_host *host = ufshcd_get_variant(hba);
  74
  75         ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
  76         ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID),
  77                        host->cdns_ufs_dme_attr_val[0]);
  78         ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID),
  79                        host->cdns_ufs_dme_attr_val[1]);
  80         ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
  81                        host->cdns_ufs_dme_attr_val[2]);
  82         ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID),
  83                        host->cdns_ufs_dme_attr_val[3]);
  84         ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS),
  85                        host->cdns_ufs_dme_attr_val[4]);
  86         ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
  87                        host->cdns_ufs_dme_attr_val[5]);
  88         ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
  89                        host->cdns_ufs_dme_attr_val[6]);
  90         ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
  91                        host->cdns_ufs_dme_attr_val[7]);
  92         ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
  93                        host->cdns_ufs_dme_attr_val[8]);
  94         ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
  95                        host->cdns_ufs_dme_attr_val[9]);
  96         ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE),
  97                        host->cdns_ufs_dme_attr_val[10]);
  98         ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
  99                        host->cdns_ufs_dme_attr_val[11]);
 100 }
 101
 102 /**
 103  * Sets HCLKDIV register value based on the core_clk
 104  * @hba: host controller instance
 105  *
 106  * Return zero for success and non-zero for failure
 107  */
 108 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
 109 {
 110         struct ufs_clk_info *clki;
 111         struct list_head *head = &hba->clk_list_head;
 112         unsigned long core_clk_rate = 0;
 113         u32 core_clk_div = 0;
 114
 115         if (list_empty(head))
 116                 return 0;
 117
 118         list_for_each_entry(clki, head, list) {
 119                 if (IS_ERR_OR_NULL(clki->clk))
 120                         continue;
 121                 if (!strcmp(clki->name, "core_clk"))
 122                         core_clk_rate = clk_get_rate(clki->clk);
 123         }
 124
 125         if (!core_clk_rate) {
 126                 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
 127                         __func__);
 128                 return -EINVAL;
 129         }
 130
 131         core_clk_div = core_clk_rate / USEC_PER_SEC;
 132
 133         ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
 134         /**
 135          * Make sure the register was updated,
 136          * UniPro layer will not work with an incorrect value.
 137          */
 138         mb();
 139
 140         return 0;
 141 }
 142
 143 /**
 144  * Called before and after HCE enable bit is set.
 145  * @hba: host controller instance
 146  * @status: notify stage (pre, post change)
 147  *
 148  * Return zero for success and non-zero for failure
 149  */
 150 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
 151                                       enum ufs_notify_change_status status)
 152 {
 153         if (status != PRE_CHANGE)
 154                 return 0;
 155
 156         return cdns_ufs_set_hclkdiv(hba);
 157 }
 158
 159 /**
 160  * Called around hibern8 enter/exit.
 161  * @hba: host controller instance
 162  * @cmd: UIC Command
 163  * @status: notify stage (pre, post change)
 164  *
 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  * Called before and after Link startup is carried out.
 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  * Returns 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  * Always returns 0
 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  * Always returns 0
 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         .suspend         = ufshcd_pltfrm_suspend,
 318         .resume          = ufshcd_pltfrm_resume,
 319         .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
 320         .runtime_resume  = ufshcd_pltfrm_runtime_resume,
 321         .runtime_idle    = ufshcd_pltfrm_runtime_idle,
 322 };
 323
 324 static struct platform_driver cdns_ufs_pltfrm_driver = {
 325         .probe  = cdns_ufs_pltfrm_probe,
 326         .remove = cdns_ufs_pltfrm_remove,
 327         .shutdown = ufshcd_pltfrm_shutdown,
 328         .driver = {
 329                 .name   = "cdns-ufshcd",
 330                 .pm     = &cdns_ufs_dev_pm_ops,
 331                 .of_match_table = cdns_ufs_of_match,
 332         },
 333 };
 334
 335 module_platform_driver(cdns_ufs_pltfrm_driver);
 336
 337 MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
 338 MODULE_DESCRIPTION("Cadence UFS host controller platform driver");
 339 MODULE_LICENSE("GPL v2");
 340 MODULE_VERSION(UFSHCD_DRIVER_VERSION);