drivers/scsi/ufs/ufshcd-pltfrm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Universal Flash Storage Host controller Platform bus based glue driver
   4  * Copyright (C) 2011-2013 Samsung India Software Operations
   5  *
   6  * Authors:
   7  *      Santosh Yaraganavi <santosh.sy@samsung.com>
   8  *      Vinayak Holikatti <h.vinayak@samsung.com>
   9  */
  10
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_runtime.h>
  13 #include <linux/of.h>
  14
  15 #include "ufshcd.h"
  16 #include "ufshcd-pltfrm.h"
  17 #include "unipro.h"
  18
  19 #define UFSHCD_DEFAULT_LANES_PER_DIRECTION              2
  20
  21 static int ufshcd_parse_clock_info(struct ufs_hba *hba)
  22 {
  23         int ret = 0;
  24         int cnt;
  25         int i;
  26         struct device *dev = hba->dev;
  27         struct device_node *np = dev->of_node;
  28         char *name;
  29         u32 *clkfreq = NULL;
  30         struct ufs_clk_info *clki;
  31         int len = 0;
  32         size_t sz = 0;
  33
  34         if (!np)
  35                 goto out;
  36
  37         cnt = of_property_count_strings(np, "clock-names");
  38         if (!cnt || (cnt == -EINVAL)) {
  39                 dev_info(dev, "%s: Unable to find clocks, assuming enabled\n",
  40                                 __func__);
  41         } else if (cnt < 0) {
  42                 dev_err(dev, "%s: count clock strings failed, err %d\n",
  43                                 __func__, cnt);
  44                 ret = cnt;
  45         }
  46
  47         if (cnt <= 0)
  48                 goto out;
  49
  50         if (!of_get_property(np, "freq-table-hz", &len)) {
  51                 dev_info(dev, "freq-table-hz property not specified\n");
  52                 goto out;
  53         }
  54
  55         if (len <= 0)
  56                 goto out;
  57
  58         sz = len / sizeof(*clkfreq);
  59         if (sz != 2 * cnt) {
  60                 dev_err(dev, "%s len mismatch\n", "freq-table-hz");
  61                 ret = -EINVAL;
  62                 goto out;
  63         }
  64
  65         clkfreq = devm_kcalloc(dev, sz, sizeof(*clkfreq),
  66                                GFP_KERNEL);
  67         if (!clkfreq) {
  68                 ret = -ENOMEM;
  69                 goto out;
  70         }
  71
  72         ret = of_property_read_u32_array(np, "freq-table-hz",
  73                         clkfreq, sz);
  74         if (ret && (ret != -EINVAL)) {
  75                 dev_err(dev, "%s: error reading array %d\n",
  76                                 "freq-table-hz", ret);
  77                 return ret;
  78         }
  79
  80         for (i = 0; i < sz; i += 2) {
  81                 ret = of_property_read_string_index(np,
  82                                 "clock-names", i/2, (const char **)&name);
  83                 if (ret)
  84                         goto out;
  85
  86                 clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);
  87                 if (!clki) {
  88                         ret = -ENOMEM;
  89                         goto out;
  90                 }
  91
  92                 clki->min_freq = clkfreq[i];
  93                 clki->max_freq = clkfreq[i+1];
  94                 clki->name = devm_kstrdup(dev, name, GFP_KERNEL);
  95                 if (!strcmp(name, "ref_clk"))
  96                         clki->keep_link_active = true;
  97                 dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",
  98                                 clki->min_freq, clki->max_freq, clki->name);
  99                 list_add_tail(&clki->list, &hba->clk_list_head);
 100         }
 101 out:
 102         return ret;
 103 }
 104
 105 #define MAX_PROP_SIZE 32
 106 static int ufshcd_populate_vreg(struct device *dev, const char *name,
 107                 struct ufs_vreg **out_vreg)
 108 {
 109         char prop_name[MAX_PROP_SIZE];
 110         struct ufs_vreg *vreg = NULL;
 111         struct device_node *np = dev->of_node;
 112
 113         if (!np) {
 114                 dev_err(dev, "%s: non DT initialization\n", __func__);
 115                 goto out;
 116         }
 117
 118         snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", name);
 119         if (!of_parse_phandle(np, prop_name, 0)) {
 120                 dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n",
 121                                 __func__, prop_name);
 122                 goto out;
 123         }
 124
 125         vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
 126         if (!vreg)
 127                 return -ENOMEM;
 128
 129         vreg->name = devm_kstrdup(dev, name, GFP_KERNEL);
 130
 131         snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
 132         if (of_property_read_u32(np, prop_name, &vreg->max_uA)) {
 133                 dev_info(dev, "%s: unable to find %s\n", __func__, prop_name);
 134                 vreg->max_uA = 0;
 135         }
 136 out:
 137         *out_vreg = vreg;
 138         return 0;
 139 }
 140
 141 /**
 142  * ufshcd_parse_regulator_info - get regulator info from device tree
 143  * @hba: per adapter instance
 144  *
 145  * Get regulator info from device tree for vcc, vccq, vccq2 power supplies.
 146  * If any of the supplies are not defined it is assumed that they are always-on
 147  * and hence return zero. If the property is defined but parsing is failed
 148  * then return corresponding error.
 149  */
 150 static int ufshcd_parse_regulator_info(struct ufs_hba *hba)
 151 {
 152         int err;
 153         struct device *dev = hba->dev;
 154         struct ufs_vreg_info *info = &hba->vreg_info;
 155
 156         err = ufshcd_populate_vreg(dev, "vdd-hba", &info->vdd_hba);
 157         if (err)
 158                 goto out;
 159
 160         err = ufshcd_populate_vreg(dev, "vcc", &info->vcc);
 161         if (err)
 162                 goto out;
 163
 164         err = ufshcd_populate_vreg(dev, "vccq", &info->vccq);
 165         if (err)
 166                 goto out;
 167
 168         err = ufshcd_populate_vreg(dev, "vccq2", &info->vccq2);
 169 out:
 170         return err;
 171 }
 172
 173 void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
 174 {
 175         ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
 176 }
 177 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown);
 178
 179 static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba)
 180 {
 181         struct device *dev = hba->dev;
 182         int ret;
 183
 184         ret = of_property_read_u32(dev->of_node, "lanes-per-direction",
 185                 &hba->lanes_per_direction);
 186         if (ret) {
 187                 dev_dbg(hba->dev,
 188                         "%s: failed to read lanes-per-direction, ret=%d\n",
 189                         __func__, ret);
 190                 hba->lanes_per_direction = UFSHCD_DEFAULT_LANES_PER_DIRECTION;
 191         }
 192 }
 193
 194 /**
 195  * ufshcd_get_pwr_dev_param - get finally agreed attributes for
 196  *                            power mode change
 197  * @pltfrm_param: pointer to platform parameters
 198  * @dev_max: pointer to device attributes
 199  * @agreed_pwr: returned agreed attributes
 200  *
 201  * Returns 0 on success, non-zero value on failure
 202  */
 203 int ufshcd_get_pwr_dev_param(struct ufs_dev_params *pltfrm_param,
 204                              struct ufs_pa_layer_attr *dev_max,
 205                              struct ufs_pa_layer_attr *agreed_pwr)
 206 {
 207         int min_pltfrm_gear;
 208         int min_dev_gear;
 209         bool is_dev_sup_hs = false;
 210         bool is_pltfrm_max_hs = false;
 211
 212         if (dev_max->pwr_rx == FAST_MODE)
 213                 is_dev_sup_hs = true;
 214
 215         if (pltfrm_param->desired_working_mode == UFS_HS_MODE) {
 216                 is_pltfrm_max_hs = true;
 217                 min_pltfrm_gear = min_t(u32, pltfrm_param->hs_rx_gear,
 218                                         pltfrm_param->hs_tx_gear);
 219         } else {
 220                 min_pltfrm_gear = min_t(u32, pltfrm_param->pwm_rx_gear,
 221                                         pltfrm_param->pwm_tx_gear);
 222         }
 223
 224         /*
 225          * device doesn't support HS but
 226          * pltfrm_param->desired_working_mode is HS,
 227          * thus device and pltfrm_param don't agree
 228          */
 229         if (!is_dev_sup_hs && is_pltfrm_max_hs) {
 230                 pr_info("%s: device doesn't support HS\n",
 231                         __func__);
 232                 return -ENOTSUPP;
 233         } else if (is_dev_sup_hs && is_pltfrm_max_hs) {
 234                 /*
 235                  * since device supports HS, it supports FAST_MODE.
 236                  * since pltfrm_param->desired_working_mode is also HS
 237                  * then final decision (FAST/FASTAUTO) is done according
 238                  * to pltfrm_params as it is the restricting factor
 239                  */
 240                 agreed_pwr->pwr_rx = pltfrm_param->rx_pwr_hs;
 241                 agreed_pwr->pwr_tx = agreed_pwr->pwr_rx;
 242         } else {
 243                 /*
 244                  * here pltfrm_param->desired_working_mode is PWM.
 245                  * it doesn't matter whether device supports HS or PWM,
 246                  * in both cases pltfrm_param->desired_working_mode will
 247                  * determine the mode
 248                  */
 249                 agreed_pwr->pwr_rx = pltfrm_param->rx_pwr_pwm;
 250                 agreed_pwr->pwr_tx = agreed_pwr->pwr_rx;
 251         }
 252
 253         /*
 254          * we would like tx to work in the minimum number of lanes
 255          * between device capability and vendor preferences.
 256          * the same decision will be made for rx
 257          */
 258         agreed_pwr->lane_tx = min_t(u32, dev_max->lane_tx,
 259                                     pltfrm_param->tx_lanes);
 260         agreed_pwr->lane_rx = min_t(u32, dev_max->lane_rx,
 261                                     pltfrm_param->rx_lanes);
 262
 263         /* device maximum gear is the minimum between device rx and tx gears */
 264         min_dev_gear = min_t(u32, dev_max->gear_rx, dev_max->gear_tx);
 265
 266         /*
 267          * if both device capabilities and vendor pre-defined preferences are
 268          * both HS or both PWM then set the minimum gear to be the chosen
 269          * working gear.
 270          * if one is PWM and one is HS then the one that is PWM get to decide
 271          * what is the gear, as it is the one that also decided previously what
 272          * pwr the device will be configured to.
 273          */
 274         if ((is_dev_sup_hs && is_pltfrm_max_hs) ||
 275             (!is_dev_sup_hs && !is_pltfrm_max_hs)) {
 276                 agreed_pwr->gear_rx =
 277                         min_t(u32, min_dev_gear, min_pltfrm_gear);
 278         } else if (!is_dev_sup_hs) {
 279                 agreed_pwr->gear_rx = min_dev_gear;
 280         } else {
 281                 agreed_pwr->gear_rx = min_pltfrm_gear;
 282         }
 283         agreed_pwr->gear_tx = agreed_pwr->gear_rx;
 284
 285         agreed_pwr->hs_rate = pltfrm_param->hs_rate;
 286
 287         return 0;
 288 }
 289 EXPORT_SYMBOL_GPL(ufshcd_get_pwr_dev_param);
 290
 291 void ufshcd_init_pwr_dev_param(struct ufs_dev_params *dev_param)
 292 {
 293         dev_param->tx_lanes = 2;
 294         dev_param->rx_lanes = 2;
 295         dev_param->hs_rx_gear = UFS_HS_G3;
 296         dev_param->hs_tx_gear = UFS_HS_G3;
 297         dev_param->pwm_rx_gear = UFS_PWM_G4;
 298         dev_param->pwm_tx_gear = UFS_PWM_G4;
 299         dev_param->rx_pwr_pwm = SLOW_MODE;
 300         dev_param->tx_pwr_pwm = SLOW_MODE;
 301         dev_param->rx_pwr_hs = FAST_MODE;
 302         dev_param->tx_pwr_hs = FAST_MODE;
 303         dev_param->hs_rate = PA_HS_MODE_B;
 304         dev_param->desired_working_mode = UFS_HS_MODE;
 305 }
 306 EXPORT_SYMBOL_GPL(ufshcd_init_pwr_dev_param);
 307
 308 /**
 309  * ufshcd_pltfrm_init - probe routine of the driver
 310  * @pdev: pointer to Platform device handle
 311  * @vops: pointer to variant ops
 312  *
 313  * Returns 0 on success, non-zero value on failure
 314  */
 315 int ufshcd_pltfrm_init(struct platform_device *pdev,
 316                        const struct ufs_hba_variant_ops *vops)
 317 {
 318         struct ufs_hba *hba;
 319         void __iomem *mmio_base;
 320         int irq, err;
 321         struct device *dev = &pdev->dev;
 322
 323         mmio_base = devm_platform_ioremap_resource(pdev, 0);
 324         if (IS_ERR(mmio_base)) {
 325                 err = PTR_ERR(mmio_base);
 326                 goto out;
 327         }
 328
 329         irq = platform_get_irq(pdev, 0);
 330         if (irq < 0) {
 331                 err = irq;
 332                 goto out;
 333         }
 334
 335         err = ufshcd_alloc_host(dev, &hba);
 336         if (err) {
 337                 dev_err(&pdev->dev, "Allocation failed\n");
 338                 goto out;
 339         }
 340
 341         hba->vops = vops;
 342
 343         err = ufshcd_parse_clock_info(hba);
 344         if (err) {
 345                 dev_err(&pdev->dev, "%s: clock parse failed %d\n",
 346                                 __func__, err);
 347                 goto dealloc_host;
 348         }
 349         err = ufshcd_parse_regulator_info(hba);
 350         if (err) {
 351                 dev_err(&pdev->dev, "%s: regulator init failed %d\n",
 352                                 __func__, err);
 353                 goto dealloc_host;
 354         }
 355
 356         ufshcd_init_lanes_per_dir(hba);
 357
 358         err = ufshcd_init(hba, mmio_base, irq);
 359         if (err) {
 360                 dev_err(dev, "Initialization failed\n");
 361                 goto dealloc_host;
 362         }
 363
 364         pm_runtime_set_active(&pdev->dev);
 365         pm_runtime_enable(&pdev->dev);
 366
 367         return 0;
 368
 369 dealloc_host:
 370         ufshcd_dealloc_host(hba);
 371 out:
 372         return err;
 373 }
 374 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_init);
 375
 376 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 377 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 378 MODULE_DESCRIPTION("UFS host controller Platform bus based glue driver");
 379 MODULE_LICENSE("GPL");
 380 MODULE_VERSION(UFSHCD_DRIVER_VERSION);