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 * snd_hdac_ext_bus_parse_capabilities - parse capablity structure 34 * @ebus: the pointer to extended bus object 35 * 36 * Returns 0 if successful, or a negative error code. 37 */ 38 int snd_hdac_ext_bus_parse_capabilities(struct hdac_ext_bus *ebus) 39 { 40 unsigned int cur_cap; 41 unsigned int offset; 42 struct hdac_bus *bus = &ebus->bus; 43 unsigned int counter = 0; 44 45 offset = snd_hdac_chip_readl(bus, LLCH); 46 47 /* Lets walk the linked capabilities list */ 48 do { 49 cur_cap = _snd_hdac_chip_read(l, bus, offset); 50 51 dev_dbg(bus->dev, "Capability version: 0x%x\n", 52 ((cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF)); 53 54 dev_dbg(bus->dev, "HDA capability ID: 0x%x\n", 55 (cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF); 56 57 switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) { 58 case AZX_ML_CAP_ID: 59 dev_dbg(bus->dev, "Found ML capability\n"); 60 ebus->mlcap = bus->remap_addr + offset; 61 break; 62 63 case AZX_GTS_CAP_ID: 64 dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset); 65 ebus->gtscap = bus->remap_addr + offset; 66 break; 67 68 case AZX_PP_CAP_ID: 69 /* PP capability found, the Audio DSP is present */ 70 dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset); 71 ebus->ppcap = bus->remap_addr + offset; 72 break; 73 74 case AZX_SPB_CAP_ID: 75 /* SPIB capability found, handler function */ 76 dev_dbg(bus->dev, "Found SPB capability\n"); 77 ebus->spbcap = bus->remap_addr + offset; 78 break; 79 80 case AZX_DRSM_CAP_ID: 81 /* DMA resume capability found, handler function */ 82 dev_dbg(bus->dev, "Found DRSM capability\n"); 83 ebus->drsmcap = bus->remap_addr + offset; 84 break; 85 86 default: 87 dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap); 88 break; 89 } 90 91 counter++; 92 93 if (counter > HDAC_MAX_CAPS) { 94 dev_err(bus->dev, "We exceeded HDAC Ext capablities!!!\n"); 95 break; 96 } 97 98 /* read the offset of next capabiity */ 99 offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK; 100 101 } while (offset); 102 103 return 0; 104 } 105 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_parse_capabilities); 106 107 /* 108 * processing pipe helpers - these helpers are useful for dealing with HDA 109 * new capability of processing pipelines 110 */ 111 112 /** 113 * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability 114 * @ebus: HD-audio extended core bus 115 * @enable: flag to turn on/off the capability 116 */ 117 void snd_hdac_ext_bus_ppcap_enable(struct hdac_ext_bus *ebus, bool enable) 118 { 119 struct hdac_bus *bus = &ebus->bus; 120 121 if (!ebus->ppcap) { 122 dev_err(bus->dev, "Address of PP capability is NULL"); 123 return; 124 } 125 126 if (enable) 127 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_GPROCEN); 128 else 129 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_GPROCEN, 0); 130 } 131 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable); 132 133 /** 134 * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable 135 * @ebus: HD-audio extended core bus 136 * @enable: flag to enable/disable interrupt 137 */ 138 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_ext_bus *ebus, bool enable) 139 { 140 struct hdac_bus *bus = &ebus->bus; 141 142 if (!ebus->ppcap) { 143 dev_err(bus->dev, "Address of PP capability is NULL\n"); 144 return; 145 } 146 147 if (enable) 148 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0, AZX_PPCTL_PIE); 149 else 150 snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, AZX_PPCTL_PIE, 0); 151 } 152 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable); 153 154 /* 155 * Multilink helpers - these helpers are useful for dealing with HDA 156 * new multilink capability 157 */ 158 159 /** 160 * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability 161 * @ebus: HD-audio extended core bus 162 * 163 * This will parse all links and read the mlink capabilities and add them 164 * in hlink_list of extended hdac bus 165 * Note: this will be freed on bus exit by driver 166 */ 167 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_ext_bus *ebus) 168 { 169 int idx; 170 u32 link_count; 171 struct hdac_ext_link *hlink; 172 struct hdac_bus *bus = &ebus->bus; 173 174 link_count = readl(ebus->mlcap + AZX_REG_ML_MLCD) + 1; 175 176 dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count); 177 178 for (idx = 0; idx < link_count; idx++) { 179 hlink = kzalloc(sizeof(*hlink), GFP_KERNEL); 180 if (!hlink) 181 return -ENOMEM; 182 hlink->index = idx; 183 hlink->bus = bus; 184 hlink->ml_addr = ebus->mlcap + AZX_ML_BASE + 185 (AZX_ML_INTERVAL * idx); 186 hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP); 187 hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID); 188 189 /* since link in On, update the ref */ 190 hlink->ref_count = 1; 191 192 list_add_tail(&hlink->list, &ebus->hlink_list); 193 } 194 195 return 0; 196 } 197 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities); 198 199 /** 200 * snd_hdac_link_free_all- free hdac extended link objects 201 * 202 * @ebus: HD-audio ext core bus 203 */ 204 205 void snd_hdac_link_free_all(struct hdac_ext_bus *ebus) 206 { 207 struct hdac_ext_link *l; 208 209 while (!list_empty(&ebus->hlink_list)) { 210 l = list_first_entry(&ebus->hlink_list, struct hdac_ext_link, list); 211 list_del(&l->list); 212 kfree(l); 213 } 214 } 215 EXPORT_SYMBOL_GPL(snd_hdac_link_free_all); 216 217 /** 218 * snd_hdac_ext_bus_get_link_index - get link based on codec name 219 * @ebus: HD-audio extended core bus 220 * @codec_name: codec name 221 */ 222 struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_ext_bus *ebus, 223 const char *codec_name) 224 { 225 int i; 226 struct hdac_ext_link *hlink = NULL; 227 int bus_idx, addr; 228 229 if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2) 230 return NULL; 231 if (ebus->idx != bus_idx) 232 return NULL; 233 234 list_for_each_entry(hlink, &ebus->hlink_list, list) { 235 for (i = 0; i < HDA_MAX_CODECS; i++) { 236 if (hlink->lsdiid & (0x1 << addr)) 237 return hlink; 238 } 239 } 240 241 return NULL; 242 } 243 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link); 244 245 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable) 246 { 247 int timeout; 248 u32 val; 249 int mask = (1 << AZX_MLCTL_CPA); 250 251 udelay(3); 252 timeout = 150; 253 254 do { 255 val = readl(link->ml_addr + AZX_REG_ML_LCTL); 256 if (enable) { 257 if (((val & mask) >> AZX_MLCTL_CPA)) 258 return 0; 259 } else { 260 if (!((val & mask) >> AZX_MLCTL_CPA)) 261 return 0; 262 } 263 udelay(3); 264 } while (--timeout); 265 266 return -EIO; 267 } 268 269 /** 270 * snd_hdac_ext_bus_link_power_up -power up hda link 271 * @link: HD-audio extended link 272 */ 273 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link) 274 { 275 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA); 276 277 return check_hdac_link_power_active(link, true); 278 } 279 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up); 280 281 /** 282 * snd_hdac_ext_bus_link_power_down -power down hda link 283 * @link: HD-audio extended link 284 */ 285 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link) 286 { 287 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0); 288 289 return check_hdac_link_power_active(link, false); 290 } 291 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down); 292 293 /** 294 * snd_hdac_ext_bus_link_power_up_all -power up all hda link 295 * @ebus: HD-audio extended bus 296 */ 297 int snd_hdac_ext_bus_link_power_up_all(struct hdac_ext_bus *ebus) 298 { 299 struct hdac_ext_link *hlink = NULL; 300 int ret; 301 302 list_for_each_entry(hlink, &ebus->hlink_list, list) { 303 snd_hdac_updatel(hlink->ml_addr, 304 AZX_REG_ML_LCTL, 0, AZX_MLCTL_SPA); 305 ret = check_hdac_link_power_active(hlink, true); 306 if (ret < 0) 307 return ret; 308 } 309 310 return 0; 311 } 312 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all); 313 314 /** 315 * snd_hdac_ext_bus_link_power_down_all -power down all hda link 316 * @ebus: HD-audio extended bus 317 */ 318 int snd_hdac_ext_bus_link_power_down_all(struct hdac_ext_bus *ebus) 319 { 320 struct hdac_ext_link *hlink = NULL; 321 int ret; 322 323 list_for_each_entry(hlink, &ebus->hlink_list, list) { 324 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0); 325 ret = check_hdac_link_power_active(hlink, false); 326 if (ret < 0) 327 return ret; 328 } 329 330 return 0; 331 } 332 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all); 333 334 int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus, 335 struct hdac_ext_link *link) 336 { 337 int ret = 0; 338 339 mutex_lock(&ebus->lock); 340 341 /* 342 * if we move from 0 to 1, count will be 1 so power up this link 343 * as well, also check the dma status and trigger that 344 */ 345 if (++link->ref_count == 1) { 346 if (!ebus->cmd_dma_state) { 347 snd_hdac_bus_init_cmd_io(&ebus->bus); 348 ebus->cmd_dma_state = true; 349 } 350 351 ret = snd_hdac_ext_bus_link_power_up(link); 352 } 353 354 mutex_unlock(&ebus->lock); 355 return ret; 356 } 357 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get); 358 359 int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus, 360 struct hdac_ext_link *link) 361 { 362 int ret = 0; 363 struct hdac_ext_link *hlink; 364 bool link_up = false; 365 366 mutex_lock(&ebus->lock); 367 368 /* 369 * if we move from 1 to 0, count will be 0 370 * so power down this link as well 371 */ 372 if (--link->ref_count == 0) { 373 ret = snd_hdac_ext_bus_link_power_down(link); 374 375 /* 376 * now check if all links are off, if so turn off 377 * cmd dma as well 378 */ 379 list_for_each_entry(hlink, &ebus->hlink_list, list) { 380 if (hlink->ref_count) { 381 link_up = true; 382 break; 383 } 384 } 385 386 if (!link_up) { 387 snd_hdac_bus_stop_cmd_io(&ebus->bus); 388 ebus->cmd_dma_state = false; 389 } 390 } 391 392 mutex_unlock(&ebus->lock); 393 return ret; 394 } 395 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put); 396