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