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 #include "ufshcd-pltfrm.h"
  42
  43 #define UFSHCD_DEFAULT_LANES_PER_DIRECTION              2
  44
  45 static int ufshcd_parse_clock_info(struct ufs_hba *hba)
  46 {
  47         int ret = 0;
  48         int cnt;
  49         int i;
  50         struct device *dev = hba->dev;
  51         struct device_node *np = dev->of_node;
  52         char *name;
  53         u32 *clkfreq = NULL;
  54         struct ufs_clk_info *clki;
  55         int len = 0;
  56         size_t sz = 0;
  57
  58         if (!np)
  59                 goto out;
  60
  61         INIT_LIST_HEAD(&hba->clk_list_head);
  62
  63         cnt = of_property_count_strings(np, "clock-names");
  64         if (!cnt || (cnt == -EINVAL)) {
  65                 dev_info(dev, "%s: Unable to find clocks, assuming enabled\n",
  66                                 __func__);
  67         } else if (cnt < 0) {
  68                 dev_err(dev, "%s: count clock strings failed, err %d\n",
  69                                 __func__, cnt);
  70                 ret = cnt;
  71         }
  72
  73         if (cnt <= 0)
  74                 goto out;
  75
  76         if (!of_get_property(np, "freq-table-hz", &len)) {
  77                 dev_info(dev, "freq-table-hz property not specified\n");
  78                 goto out;
  79         }
  80
  81         if (len <= 0)
  82                 goto out;
  83
  84         sz = len / sizeof(*clkfreq);
  85         if (sz != 2 * cnt) {
  86                 dev_err(dev, "%s len mismatch\n", "freq-table-hz");
  87                 ret = -EINVAL;
  88                 goto out;
  89         }
  90
  91         clkfreq = devm_kzalloc(dev, sz * sizeof(*clkfreq),
  92                         GFP_KERNEL);
  93         if (!clkfreq) {
  94                 ret = -ENOMEM;
  95                 goto out;
  96         }
  97
  98         ret = of_property_read_u32_array(np, "freq-table-hz",
  99                         clkfreq, sz);
 100         if (ret && (ret != -EINVAL)) {
 101                 dev_err(dev, "%s: error reading array %d\n",
 102                                 "freq-table-hz", ret);
 103                 return ret;
 104         }
 105
 106         for (i = 0; i < sz; i += 2) {
 107                 ret = of_property_read_string_index(np,
 108                                 "clock-names", i/2, (const char **)&name);
 109                 if (ret)
 110                         goto out;
 111
 112                 clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL);
 113                 if (!clki) {
 114                         ret = -ENOMEM;
 115                         goto out;
 116                 }
 117
 118                 clki->min_freq = clkfreq[i];
 119                 clki->max_freq = clkfreq[i+1];
 120                 clki->name = kstrdup(name, GFP_KERNEL);
 121                 dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",
 122                                 clki->min_freq, clki->max_freq, clki->name);
 123                 list_add_tail(&clki->list, &hba->clk_list_head);
 124         }
 125 out:
 126         return ret;
 127 }
 128
 129 #define MAX_PROP_SIZE 32
 130 static int ufshcd_populate_vreg(struct device *dev, const char *name,
 131                 struct ufs_vreg **out_vreg)
 132 {
 133         int ret = 0;
 134         char prop_name[MAX_PROP_SIZE];
 135         struct ufs_vreg *vreg = NULL;
 136         struct device_node *np = dev->of_node;
 137
 138         if (!np) {
 139                 dev_err(dev, "%s: non DT initialization\n", __func__);
 140                 goto out;
 141         }
 142
 143         snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", name);
 144         if (!of_parse_phandle(np, prop_name, 0)) {
 145                 dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n",
 146                                 __func__, prop_name);
 147                 goto out;
 148         }
 149
 150         vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
 151         if (!vreg)
 152                 return -ENOMEM;
 153
 154         vreg->name = kstrdup(name, GFP_KERNEL);
 155
 156         /* if fixed regulator no need further initialization */
 157         snprintf(prop_name, MAX_PROP_SIZE, "%s-fixed-regulator", name);
 158         if (of_property_read_bool(np, prop_name))
 159                 goto out;
 160
 161         snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
 162         ret = of_property_read_u32(np, prop_name, &vreg->max_uA);
 163         if (ret) {
 164                 dev_err(dev, "%s: unable to find %s err %d\n",
 165                                 __func__, prop_name, ret);
 166                 goto out;
 167         }
 168
 169         vreg->min_uA = 0;
 170         if (!strcmp(name, "vcc")) {
 171                 if (of_property_read_bool(np, "vcc-supply-1p8")) {
 172                         vreg->min_uV = UFS_VREG_VCC_1P8_MIN_UV;
 173                         vreg->max_uV = UFS_VREG_VCC_1P8_MAX_UV;
 174                 } else {
 175                         vreg->min_uV = UFS_VREG_VCC_MIN_UV;
 176                         vreg->max_uV = UFS_VREG_VCC_MAX_UV;
 177                 }
 178         } else if (!strcmp(name, "vccq")) {
 179                 vreg->min_uV = UFS_VREG_VCCQ_MIN_UV;
 180                 vreg->max_uV = UFS_VREG_VCCQ_MAX_UV;
 181         } else if (!strcmp(name, "vccq2")) {
 182                 vreg->min_uV = UFS_VREG_VCCQ2_MIN_UV;
 183                 vreg->max_uV = UFS_VREG_VCCQ2_MAX_UV;
 184         }
 185
 186         goto out;
 187
 188 out:
 189         if (!ret)
 190                 *out_vreg = vreg;
 191         return ret;
 192 }
 193
 194 /**
 195  * ufshcd_parse_regulator_info - get regulator info from device tree
 196  * @hba: per adapter instance
 197  *
 198  * Get regulator info from device tree for vcc, vccq, vccq2 power supplies.
 199  * If any of the supplies are not defined it is assumed that they are always-on
 200  * and hence return zero. If the property is defined but parsing is failed
 201  * then return corresponding error.
 202  */
 203 static int ufshcd_parse_regulator_info(struct ufs_hba *hba)
 204 {
 205         int err;
 206         struct device *dev = hba->dev;
 207         struct ufs_vreg_info *info = &hba->vreg_info;
 208
 209         err = ufshcd_populate_vreg(dev, "vdd-hba", &info->vdd_hba);
 210         if (err)
 211                 goto out;
 212
 213         err = ufshcd_populate_vreg(dev, "vcc", &info->vcc);
 214         if (err)
 215                 goto out;
 216
 217         err = ufshcd_populate_vreg(dev, "vccq", &info->vccq);
 218         if (err)
 219                 goto out;
 220
 221         err = ufshcd_populate_vreg(dev, "vccq2", &info->vccq2);
 222 out:
 223         return err;
 224 }
 225
 226 #ifdef CONFIG_PM
 227 /**
 228  * ufshcd_pltfrm_suspend - suspend power management function
 229  * @dev: pointer to device handle
 230  *
 231  * Returns 0 if successful
 232  * Returns non-zero otherwise
 233  */
 234 int ufshcd_pltfrm_suspend(struct device *dev)
 235 {
 236         return ufshcd_system_suspend(dev_get_drvdata(dev));
 237 }
 238 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_suspend);
 239
 240 /**
 241  * ufshcd_pltfrm_resume - resume power management function
 242  * @dev: pointer to device handle
 243  *
 244  * Returns 0 if successful
 245  * Returns non-zero otherwise
 246  */
 247 int ufshcd_pltfrm_resume(struct device *dev)
 248 {
 249         return ufshcd_system_resume(dev_get_drvdata(dev));
 250 }
 251 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_resume);
 252
 253 int ufshcd_pltfrm_runtime_suspend(struct device *dev)
 254 {
 255         return ufshcd_runtime_suspend(dev_get_drvdata(dev));
 256 }
 257 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_suspend);
 258
 259 int ufshcd_pltfrm_runtime_resume(struct device *dev)
 260 {
 261         return ufshcd_runtime_resume(dev_get_drvdata(dev));
 262 }
 263 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_resume);
 264
 265 int ufshcd_pltfrm_runtime_idle(struct device *dev)
 266 {
 267         return ufshcd_runtime_idle(dev_get_drvdata(dev));
 268 }
 269 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_idle);
 270
 271 #endif /* CONFIG_PM */
 272
 273 void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
 274 {
 275         ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
 276 }
 277 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown);
 278
 279 static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba)
 280 {
 281         struct device *dev = hba->dev;
 282         int ret;
 283
 284         ret = of_property_read_u32(dev->of_node, "lanes-per-direction",
 285                 &hba->lanes_per_direction);
 286         if (ret) {
 287                 dev_dbg(hba->dev,
 288                         "%s: failed to read lanes-per-direction, ret=%d\n",
 289                         __func__, ret);
 290                 hba->lanes_per_direction = UFSHCD_DEFAULT_LANES_PER_DIRECTION;
 291         }
 292 }
 293
 294 /**
 295  * ufshcd_pltfrm_init - probe routine of the driver
 296  * @pdev: pointer to Platform device handle
 297  * @vops: pointer to variant ops
 298  *
 299  * Returns 0 on success, non-zero value on failure
 300  */
 301 int ufshcd_pltfrm_init(struct platform_device *pdev,
 302                        struct ufs_hba_variant_ops *vops)
 303 {
 304         struct ufs_hba *hba;
 305         void __iomem *mmio_base;
 306         struct resource *mem_res;
 307         int irq, err;
 308         struct device *dev = &pdev->dev;
 309
 310         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 311         mmio_base = devm_ioremap_resource(dev, mem_res);
 312         if (IS_ERR(mmio_base)) {
 313                 err = PTR_ERR(mmio_base);
 314                 goto out;
 315         }
 316
 317         irq = platform_get_irq(pdev, 0);
 318         if (irq < 0) {
 319                 dev_err(dev, "IRQ resource not available\n");
 320                 err = -ENODEV;
 321                 goto out;
 322         }
 323
 324         err = ufshcd_alloc_host(dev, &hba);
 325         if (err) {
 326                 dev_err(&pdev->dev, "Allocation failed\n");
 327                 goto out;
 328         }
 329
 330         hba->vops = vops;
 331
 332         err = ufshcd_parse_clock_info(hba);
 333         if (err) {
 334                 dev_err(&pdev->dev, "%s: clock parse failed %d\n",
 335                                 __func__, err);
 336                 goto dealloc_host;
 337         }
 338         err = ufshcd_parse_regulator_info(hba);
 339         if (err) {
 340                 dev_err(&pdev->dev, "%s: regulator init failed %d\n",
 341                                 __func__, err);
 342                 goto dealloc_host;
 343         }
 344
 345         pm_runtime_set_active(&pdev->dev);
 346         pm_runtime_enable(&pdev->dev);
 347
 348         ufshcd_init_lanes_per_dir(hba);
 349
 350         err = ufshcd_init(hba, mmio_base, irq);
 351         if (err) {
 352                 dev_err(dev, "Initialization failed\n");
 353                 goto out_disable_rpm;
 354         }
 355
 356         platform_set_drvdata(pdev, hba);
 357
 358         return 0;
 359
 360 out_disable_rpm:
 361         pm_runtime_disable(&pdev->dev);
 362         pm_runtime_set_suspended(&pdev->dev);
 363 dealloc_host:
 364         ufshcd_dealloc_host(hba);
 365 out:
 366         return err;
 367 }
 368 EXPORT_SYMBOL_GPL(ufshcd_pltfrm_init);
 369
 370 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
 371 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
 372 MODULE_DESCRIPTION("UFS host controller Platform bus based glue driver");
 373 MODULE_LICENSE("GPL");
 374 MODULE_VERSION(UFSHCD_DRIVER_VERSION);