sound/hda/ext/hdac_ext_controller.c

   1 /*
   2  *  hdac-ext-controller.c - HD-audio extended controller functions.
   3  *
   4  *  Copyright (C) 2014-2015 Intel Corp
   5  *  Author: Jeeja KP <jeeja.kp@intel.com>
   6  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful, but
  13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  General Public License for more details.
  16  *
  17  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  18  */
  19
  20 #include <linux/delay.h>
  21 #include <linux/slab.h>
  22 #include <sound/hda_register.h>
  23 #include <sound/hdaudio_ext.h>
  24
  25 /*
  26  * maximum HDAC capablities we should parse to avoid endless looping:
  27  * currently we have 4 extended caps, so this is future proof for now.
  28  * extend when this limit is seen meeting in real HW
  29  */
  30 #define HDAC_MAX_CAPS 10
  31
  32 /*
  33  * processing pipe helpers - these helpers are useful for dealing with HDA
  34  * new capability of processing pipelines
  35  */
  36
  37 /**
  38  * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability
  39  * @ebus: HD-audio extended core bus
  40  * @enable: flag to turn on/off the capability
  41  */
  42 void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable)
  43 {
  44         struct hdac_bus *bus = &ebus->bus;
  45
  46         if (!bus->ppcap) {
  47                 dev_err(bus->dev, "Address of PP capability is NULL");
  48                 return;
  49         }
  50
  51         if (enable)
  52                 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN);
  53         else
  54                 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0);
  55 }
  56 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
  57
  58 /**
  59  * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable
  60  * @ebus: HD-audio extended core bus
  61  * @enable: flag to enable/disable interrupt
  62  */
  63 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable)
  64 {
  65         struct hdac_bus *bus = &ebus->bus;
  66
  67         if (!bus->ppcap) {
  68                 dev_err(bus->dev, "Address of PP capability is NULL\n");
  69                 return;
  70         }
  71
  72         if (enable)
  73                 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE);
  74         else
  75                 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_PIE, 0);
  76 }
  77 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
  78
  79 /*
  80  * Multilink helpers - these helpers are useful for dealing with HDA
  81  * new multilink capability
  82  */
  83
  84 /**
  85  * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
  86  * @ebus: HD-audio extended core bus
  87  *
  88  * This will parse all links and read the mlink capabilities and add them
  89  * in hlink_list of extended hdac bus
  90  * Note: this will be freed on bus exit by driver
  91  */
  92 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus)
  93 {
  94         int idx;
  95         u32 link_count;
  96         struct hdac_ext_link *hlink;
  97         struct hdac_bus *bus = &ebus->bus;
  98
  99         link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
 100
 101         dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
 102
 103         for (idx = 0; idx < link_count; idx++) {
 104                 hlink  = kzalloc(sizeof(*hlink), GFP_KERNEL);
 105                 if (!hlink)
 106                         return -ENOMEM;
 107                 hlink->index = idx;
 108                 hlink->bus = bus;
 109                 hlink->ml_addr = bus->mlcap + AZX_ML_BASE +
 110                                         (AZX_ML_INTERVAL * idx);
 111                 hlink->lcaps  = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
 112                 hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
 113
 114                 /* since link in On, update the ref */
 115                 hlink->ref_count = 1;
 116
 117                 list_add_tail(&hlink->list, &ebus->hlink_list);
 118         }
 119
 120         return 0;
 121 }
 122 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
 123
 124 /**
 125  * snd_hdac_link_free_all- free hdac extended link objects
 126  *
 127  * @ebus: HD-audio ext core bus
 128  */
 129
 130 void snd_hdac_link_free_all(struct hdac_ext_bus *ebus)
 131 {
 132         struct hdac_ext_link *l;
 133
 134         while (!list_empty(&ebus->hlink_list)) {
 135                 l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list);
 136                 list_del(&l->list);
 137                 kfree(l);
 138         }
 139 }
 140 EXPORT_SYMBOL_GPL(snd_hdac_link_free_all);
 141
 142 /**
 143  * snd_hdac_ext_bus_get_link_index - get link based on codec name
 144  * @ebus: HD-audio extended core bus
 145  * @codec_name: codec name
 146  */
 147 struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus,
 148                                                  const char *codec_name)
 149 {
 150         int i;
 151         struct hdac_ext_link *hlink = NULL;
 152         int bus_idx, addr;
 153
 154         if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
 155                 return NULL;
 156         if (ebus->idx != bus_idx)
 157                 return NULL;
 158
 159         list_for_each_entry(hlink, &ebus->hlink_list, list) {
 160                 for (i = 0; i < HDA_MAX_CODECS; i++) {
 161                         if (hlink->lsdiid & (0x1 << addr))
 162                                 return hlink;
 163                 }
 164         }
 165
 166         return NULL;
 167 }
 168 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link);
 169
 170 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable)
 171 {
 172         int timeout;
 173         u32 val;
 174         int mask = (1 << AZX_MLCTL_CPA);
 175
 176         udelay(3);
 177         timeout = 150;
 178
 179         do {
 180                 val = readl(link->ml_addr + AZX_REG_ML_LCTL);
 181                 if (enable) {
 182                         if (((val & mask) >> AZX_MLCTL_CPA))
 183                                 return 0;
 184                 } else {
 185                         if (!((val & mask) >> AZX_MLCTL_CPA))
 186                                 return 0;
 187                 }
 188                 udelay(3);
 189         } while (--timeout);
 190
 191         return -EIO;
 192 }
 193
 194 /**
 195  * snd_hdac_ext_bus_link_power_up -power up hda link
 196  * @link: HD-audio extended link
 197  */
 198 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link)
 199 {
 200         snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA);
 201
 202         return check_hdac_link_power_active(link, true);
 203 }
 204 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
 205
 206 /**
 207  * snd_hdac_ext_bus_link_power_down -power down hda link
 208  * @link: HD-audio extended link
 209  */
 210 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link)
 211 {
 212         snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
 213
 214         return check_hdac_link_power_active(link, false);
 215 }
 216 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
 217
 218 /**
 219  * snd_hdac_ext_bus_link_power_up_all -power up all hda link
 220  * @ebus: HD-audio extended bus
 221  */
 222 int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus)
 223 {
 224         struct hdac_ext_link *hlink = NULL;
 225         int ret;
 226
 227         list_for_each_entry(hlink, &ebus->hlink_list, list) {
 228                 snd_hdac_updatel(hlink->ml_addr,
 229                                 AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA);
 230                 ret = check_hdac_link_power_active(hlink, true);
 231                 if (ret < 0)
 232                         return ret;
 233         }
 234
 235         return 0;
 236 }
 237 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
 238
 239 /**
 240  * snd_hdac_ext_bus_link_power_down_all -power down all hda link
 241  * @ebus: HD-audio extended bus
 242  */
 243 int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus)
 244 {
 245         struct hdac_ext_link *hlink = NULL;
 246         int ret;
 247
 248         list_for_each_entry(hlink, &ebus->hlink_list, list) {
 249                 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0);
 250                 ret = check_hdac_link_power_active(hlink, false);
 251                 if (ret < 0)
 252                         return ret;
 253         }
 254
 255         return 0;
 256 }
 257 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
 258
 259 int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus,
 260                                 struct hdac_ext_link *link)
 261 {
 262         int ret = 0;
 263
 264         mutex_lock(&ebus->lock);
 265
 266         /*
 267          * if we move from 0 to 1, count will be 1 so power up this link
 268          * as well, also check the dma status and trigger that
 269          */
 270         if (++link->ref_count == 1) {
 271                 if (!ebus->cmd_dma_state) {
 272                         snd_hdac_bus_init_cmd_io(&ebus->bus);
 273                         ebus->cmd_dma_state = true;
 274                 }
 275
 276                 ret = snd_hdac_ext_bus_link_power_up(link);
 277         }
 278
 279         mutex_unlock(&ebus->lock);
 280         return ret;
 281 }
 282 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
 283
 284 int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus,
 285                                 struct hdac_ext_link *link)
 286 {
 287         int ret = 0;
 288         struct hdac_ext_link *hlink;
 289         bool link_up = false;
 290
 291         mutex_lock(&ebus->lock);
 292
 293         /*
 294          * if we move from 1 to 0, count will be 0
 295          * so power down this link as well
 296          */
 297         if (--link->ref_count == 0) {
 298                 ret = snd_hdac_ext_bus_link_power_down(link);
 299
 300                 /*
 301                  * now check if all links are off, if so turn off
 302                  * cmd dma as well
 303                  */
 304                 list_for_each_entry(hlink, &ebus->hlink_list, list) {
 305                         if (hlink->ref_count) {
 306                                 link_up = true;
 307                                 break;
 308                         }
 309                 }
 310
 311                 if (!link_up) {
 312                         snd_hdac_bus_stop_cmd_io(&ebus->bus);
 313                         ebus->cmd_dma_state = false;
 314                 }
 315         }
 316
 317         mutex_unlock(&ebus->lock);
 318         return ret;
 319 }
 320 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);