kernel/drivers/scsi/ufs/ufshcd-pltfrm.c

   1 /*
   2  * Universal Flash Storage Host controller Platform bus based glue driver
   3  *
   4  * This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
   5  * Copyright (C) 2011-2013 Samsung India Software Operations
   6  *
   7  * Authors:
   8  *      Santosh Yaraganavi <santosh.sy@samsung.com>
   9  *      Vinayak Holikatti <h.vinayak@samsung.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  * See the COPYING file in the top-level directory or visit
  16  * <http://www.gnu.org/licenses/gpl-2.0.html>
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * This program is provided "AS IS" and "WITH ALL FAULTS" and
  24  * without warranty of any kind. You are solely responsible for
  25  * determining the appropriateness of using and distributing
  26  * the program and assume all risks associated with your exercise
  27  * of rights with respect to the program, including but not limited
  28  * to infringement of third party rights, the risks and costs of
  29  * program errors, damage to or loss of data, programs or equipment,
  30  * and unavailability or interruption of operations. Under no
  31  * circumstances will the contributor of this Program be liable for
  32  * any damages of any kind arising from your use or distribution of
  33  * this program.
  34  */
  35
  36 #include <linux/platform_device.h>
  37 #include <linux/pm_runtime.h>
  38 #include <linux/of.h>
  39
  40 #include "ufshcd.h"
  41
  42 static const struct of_device_id ufs_of_match[];
  43 static struct ufs_hba_variant_ops *get_variant_ops(struct device *dev)
  44 {
  45         if (dev->of_node) {
  46                 const struct of_device_id *match;
  47
  48                 match = of_match_node(ufs_of_match, dev->of_node);
  49                 if (match)
  50                         return (struct ufs_hba_variant_ops *)match->data;
  51         }
  52
  53         return NULL;
  54 }
  55
  56 static int ufshcd_parse_clock_info(struct ufs_hba *hba)
  57 {
  58         int ret = 0;
  59         int cnt;
  60         int i;
  61         struct device *dev = hba->dev;
  62         struct device_node *np = dev->of_node;
  63         char *name;
  64         u32 *clkfreq = NULL;
  65         struct ufs_clk_info *clki;
  66         int len = 0;
  67         size_t sz = 0;
  68
  69         if (!np)
  70                 goto out;
  71
  72         INIT_LIST_HEAD(&hba->clk_list_head);
  73
  74         cnt = of_property_count_strings(np, "clock-names");
  75         if (!cnt || (cnt == -EINVAL)) {
  76                 dev_info(dev, "%s: Unable to find clocks, assuming enabled\n",
  77                                 __func__);
  78         } else if (cnt < 0) {
  79                 dev_err(dev, "%s: count clock strings failed, err %d\n",
  80                                 __func__, cnt);
  81                 ret = cnt;
  82         }
  83
  84         if (cnt <= 0)
  85                 goto out;
  86
  87         if (!of_get_property(np, "freq-table-hz", &len)) {
  88                 dev_info(dev, "freq-table-hz property not specified\n");
  89                 goto out;
  90         }
  91
  92         if (len <= 0)
  93                 goto out;
  94
  95         sz = len / sizeof(*clkfreq);
  96         if (sz != 2 * cnt) {
  97                 dev_err(dev, "%s len mismatch\n", "freq-table-hz");
  98                 ret = -EINVAL;
  99                 goto out;
 100         }
 101
 102         clkfreq = devm_kzalloc(dev, sz * sizeof(*clkfreq),
 103                         GFP_KERNEL);
 104         if (!clkfreq) {
 105                 ret = -ENOMEM;
 106                 goto out;
 107         }
 108
 109         ret = of_property_read_u32_array(np, "freq-table-hz",
 110                         clkfreq, sz);
 111         if (ret && (ret != -EINVAL)) {
 112                 dev_err(dev, "%s: error reading array %d\n",
 113                                 "freq-table-hz", ret);
 114                 return ret;
 115         }
 116
 117         for (i = 0; i < sz; i += 2) {
 118                 ret = of_property_read_string_index(np,
 119                                 "clock-names", i/2, (const char **)&name);
 120                 if (ret)
 121                         goto out;
 122
 123                 clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);
 124                 if (!clki) {
 125                         ret = -ENOMEM;
 126                         goto out;
 127                 }
 128
 129                 clki->min_freq = clkfreq[i];
 130                 clki->max_freq = clkfreq[i+1];
 131                 clki->name = kstrdup(name, GFP_KERNEL);
 132                 dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",
 133                                 clki->min_freq, clki->max_freq, clki->name);
 134                 list_add_tail(&clki->list, &hba->clk_list_head);
 135         }
 136 out:
 137         return ret;
 138 }
 139
 140 #define MAX_PROP_SIZE 32
 141 static int ufshcd_populate_vreg(struct device *dev, const char *name,
 142                 struct ufs_vreg **out_vreg)
 143 {
 144         int ret = 0;
 145         char prop_name[MAX_PROP_SIZE];
 146         struct ufs_vreg *vreg = NULL;
 147         struct device_node *np = dev->of_node;
 148
 149         if (!np) {
 150                 dev_err(dev, "%s: non DT initialization\n", __func__);
 151                 goto out;
 152         }
 153
 154         snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", name);
 155         if (!of_parse_phandle(np, prop_name, 0)) {
 156                 dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n",
 157                                 __func__, prop_name);
 158                 goto out;
 159         }
 160
 161         vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
 162         if (!vreg)
 163                 return -ENOMEM;
 164
 165         vreg->name = kstrdup(name, GFP_KERNEL);
 166
 167         /* if fixed regulator no need further initialization */
 168         snprintf(prop_name, MAX_PROP_SIZE, "%s-fixed-regulator", name);
 169         if (of_property_read_bool(np, prop_name))
 170                 goto out;
 171
 172         snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
 173         ret = of_property_read_u32(np, prop_name, &vreg->max_uA);
 174         if (ret) {
 175                 dev_err(dev, "%s: unable to find %s err %d\n",
 176                                 __func__, prop_name, ret);
 177                 goto out_free;
 178         }
 179
 180         vreg->min_uA = 0;
 181         if (!strcmp(name, "vcc")) {
 182                 if (of_property_read_bool(np, "vcc-supply-1p8")) {
 183                         vreg->min_uV = UFS_VREG_VCC_1P8_MIN_UV;
 184                         vreg->max_uV = UFS_VREG_VCC_1P8_MAX_UV;
 185                 } else {
 186                         vreg->min_uV = UFS_VREG_VCC_MIN_UV;
 187                         vreg->max_uV = UFS_VREG_VCC_MAX_UV;
 188                 }
 189         } else if (!strcmp(name, "vccq")) {
 190                 vreg->min_uV = UFS_VREG_VCCQ_MIN_UV;
 191                 vreg->max_uV = UFS_VREG_VCCQ_MAX_UV;
 192         } else if (!strcmp(name, "vccq2")) {
 193                 vreg->min_uV = UFS_VREG_VCCQ2_MIN_UV;
 194                 vreg->max_uV = UFS_VREG_VCCQ2_MAX_UV;
 195         }
 196
 197         goto out;
 198
 199 out_free:
 200         devm_kfree(dev, vreg);
 201         vreg = NULL;
 202 out:
 203         if (!ret)
 204                 *out_vreg = vreg;
 205         return ret;
 206 }
 207
 208 /**
 209  * ufshcd_parse_regulator_info - get regulator info from device tree
 210  * @hba: per adapter instance
 211  *
 212  * Get regulator info from device tree for vcc, vccq, vccq2 power supplies.
 213  * If any of the supplies are not defined it is assumed that they are always-on
 214  * and hence return zero. If the property is defined but parsing is failed
 215  * then return corresponding error.
 216  */
 217 static int ufshcd_parse_regulator_info(struct ufs_hba *hba)
 218 {
 219         int err;
 220         struct device *dev = hba->dev;
 221         struct ufs_vreg_info *info = &hba->vreg_info;
 222
 223         err = ufshcd_populate_vreg(dev, "vdd-hba", &info->vdd_hba);
 224         if (err)
 225                 goto out;
 226
 227         err = ufshcd_populate_vreg(dev, "vcc", &info->vcc);
 228         if (err)
 229                 goto out;
 230
 231         err = ufshcd_populate_vreg(dev, "vccq", &info->vccq);
 232         if (err)
 233                 goto out;
 234
 235         err = ufshcd_populate_vreg(dev, "vccq2", &info->vccq2);
 236 out:
 237         return err;
 238 }
 239
 240 #ifdef CONFIG_PM
 241 /**
 242  * ufshcd_pltfrm_suspend - suspend power management function
 243  * @dev: pointer to device handle
 244  *
 245  * Returns 0 if successful
 246  * Returns non-zero otherwise
 247  */
 248 static int ufshcd_pltfrm_suspend(struct device *dev)
 249 {
 250         return ufshcd_system_suspend(dev_get_drvdata(dev));
 251 }
 252
 253 /**
 254  * ufshcd_pltfrm_resume - resume power management function
 255  * @dev: pointer to device handle
 256  *
 257  * Returns 0 if successful
 258  * Returns non-zero otherwise
 259  */
 260 static int ufshcd_pltfrm_resume(struct device *dev)
 261 {
 262         return ufshcd_system_resume(dev_get_drvdata(dev));
 263 }
 264
 265 static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
 266 {
 267         return ufshcd_runtime_suspend(dev_get_drvdata(dev));
 268 }
 269 static int ufshcd_pltfrm_runtime_resume(struct device *dev)
 270 {
 271         return ufshcd_runtime_resume(dev_get_drvdata(dev));
 272 }
 273 static int ufshcd_pltfrm_runtime_idle(struct device *dev)
 274 {
 275         return ufshcd_runtime_idle(dev_get_drvdata(dev));
 276 }
 277 #else /* !CONFIG_PM */
 278 #define ufshcd_pltfrm_suspend   NULL
 279 #define ufshcd_pltfrm_resume    NULL
 280 #define ufshcd_pltfrm_runtime_suspend   NULL
 281 #define ufshcd_pltfrm_runtime_resume    NULL
 282 #define ufshcd_pltfrm_runtime_idle      NULL
 283 #endif /* CONFIG_PM */
 284
 285 static void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
 286 {
 287         ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
 288 }
 289
 290 /**
 291  * ufshcd_pltfrm_probe - probe routine of the driver
 292  * @pdev: pointer to Platform device handle
 293  *
 294  * Returns 0 on success, non-zero value on failure
 295  */
 296 static int ufshcd_pltfrm_probe(struct platform_device *pdev)
 297 {
 298         struct ufs_hba *hba;
 299         void __iomem *mmio_base;
 300         struct resource *mem_res;
 301         int irq, err;
 302         struct device *dev = &pdev->dev;
 303
 304         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 305         mmio_base = devm_ioremap_resource(dev, mem_res);
 306         if (IS_ERR(*(void **)&mmio_base)) {
 307                 err = PTR_ERR(*(void **)&mmio_base);
 308                 goto out;
 309         }
 310
 311         irq = platform_get_irq(pdev, 0);
 312         if (irq < 0) {
 313                 dev_err(dev, "IRQ resource not available\n");
 314                 err = -ENODEV;
 315                 goto out;
 316         }
 317
 318         err = ufshcd_alloc_host(dev, &hba);
 319         if (err) {
 320                 dev_err(&pdev->dev, "Allocation failed\n");
 321                 goto out;
 322         }
 323
 324         hba->vops = get_variant_ops(&pdev->dev);
 325
 326         err = ufshcd_parse_clock_info(hba);
 327         if (err) {
 328                 dev_err(&pdev->dev, "%s: clock parse failed %d\n",
 329                                 __func__, err);
 330                 goto out;
 331         }
 332         err = ufshcd_parse_regulator_info(hba);
 333         if (err) {
 334                 dev_err(&pdev->dev, "%s: regulator init failed %d\n",
 335                                 __func__, err);
 336                 goto out;
 337         }
 338
 339         pm_runtime_set_active(&pdev->dev);
 340         pm_runtime_enable(&pdev->dev);
 341
 342         err = ufshcd_init(hba, mmio_base, irq);
 343         if (err) {
 344                 dev_err(dev, "Intialization failed\n");
 345                 goto out_disable_rpm;
 346         }
 347
 348         platform_set_drvdata(pdev, hba);
 349
 350         return 0;
 351
 352 out_disable_rpm:
 353         pm_runtime_disable(&pdev->dev);
 354         pm_runtime_set_suspended(&pdev->dev);
 355 out:
 356         return err;
 357 }
 358
 359 /**
 360  * ufshcd_pltfrm_remove - remove platform driver routine
 361  * @pdev: pointer to platform device handle
 362  *
 363  * Returns 0 on success, non-zero value on failure
 364  */
 365 static int ufshcd_pltfrm_remove(struct platform_device *pdev)
 366 {
 367         struct ufs_hba *hba =  platform_get_drvdata(pdev);
 368
 369         pm_runtime_get_sync(&(pdev)->dev);
 370         ufshcd_remove(hba);
 371         return 0;
 372 }
 373
 374 static const struct of_device_id ufs_of_match[] = {
 375         { .compatible = "jedec,ufs-1.1"},
 376         {},
 377 };
 378
 379 static const struct dev_pm_ops ufshcd_dev_pm_ops = {
 380         .suspend        = ufshcd_pltfrm_suspend,
 381         .resume         = ufshcd_pltfrm_resume,
 382         .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
 383         .runtime_resume  = ufshcd_pltfrm_runtime_resume,
 384         .runtime_idle    = ufshcd_pltfrm_runtime_idle,
 385 };
 386
 387 static struct platform_driver ufshcd_pltfrm_driver = {
 388         .probe  = ufshcd_pltfrm_probe,
 389         .remove = ufshcd_pltfrm_remove,
 390         .shutdown = ufshcd_pltfrm_shutdown,
 391         .driver = {
 392                 .name   = "ufshcd",
 393                 .pm     = &ufshcd_dev_pm_ops,
 394                 .of_match_table = ufs_of_match,
 395         },
 396 };
 397
 398 module_platform_driver(ufshcd_pltfrm_driver);
 399
 400 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 401 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 402 MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
 403 MODULE_LICENSE("GPL");
 404 MODULE_VERSION(UFSHCD_DRIVER_VERSION);