1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * hdac-ext-controller.c - HD-audio extended controller functions. 4 * 5 * Copyright (C) 2014-2015 Intel Corp 6 * Author: Jeeja KP <jeeja.kp@intel.com> 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 10 */ 11 12 #include <linux/delay.h> 13 #include <linux/slab.h> 14 #include <sound/hda_register.h> 15 #include <sound/hdaudio_ext.h> 16 17 /* 18 * processing pipe helpers - these helpers are useful for dealing with HDA 19 * new capability of processing pipelines 20 */ 21 22 /** 23 * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability 24 * @bus: the pointer to HDAC bus object 25 * @enable: flag to turn on/off the capability 26 */ 27 void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *bus, bool enable) 28 { 29 30 if (!bus->ppcap) { 31 dev_err(bus->dev, "Address of PP capability is NULL"); 32 return; 33 } 34 35 if (enable) 36 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 37 AZX_PPCTL_GPROCEN, AZX_PPCTL_GPROCEN); 38 else 39 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 40 AZX_PPCTL_GPROCEN, 0); 41 } 42 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable); 43 44 /** 45 * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable 46 * @bus: the pointer to HDAC bus object 47 * @enable: flag to enable/disable interrupt 48 */ 49 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *bus, bool enable) 50 { 51 52 if (!bus->ppcap) { 53 dev_err(bus->dev, "Address of PP capability is NULL\n"); 54 return; 55 } 56 57 if (enable) 58 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 59 AZX_PPCTL_PIE, AZX_PPCTL_PIE); 60 else 61 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 62 AZX_PPCTL_PIE, 0); 63 } 64 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable); 65 66 /* 67 * Multilink helpers - these helpers are useful for dealing with HDA 68 * new multilink capability 69 */ 70 71 /** 72 * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability 73 * @bus: the pointer to HDAC bus object 74 * 75 * This will parse all links and read the mlink capabilities and add them 76 * in hlink_list of extended hdac bus 77 * Note: this will be freed on bus exit by driver 78 */ 79 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus) 80 { 81 int idx; 82 u32 link_count; 83 struct hdac_ext_link *hlink; 84 85 link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1; 86 87 dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count); 88 89 for (idx = 0; idx < link_count; idx++) { 90 hlink = kzalloc(sizeof(*hlink), GFP_KERNEL); 91 if (!hlink) 92 return -ENOMEM; 93 hlink->index = idx; 94 hlink->bus = bus; 95 hlink->ml_addr = bus->mlcap + AZX_ML_BASE + 96 (AZX_ML_INTERVAL * idx); 97 hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP); 98 hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID); 99 100 /* since link in On, update the ref */ 101 hlink->ref_count = 1; 102 103 list_add_tail(&hlink->list, &bus->hlink_list); 104 } 105 106 return 0; 107 } 108 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities); 109 110 /** 111 * snd_hdac_link_free_all- free hdac extended link objects 112 * 113 * @bus: the pointer to HDAC bus object 114 */ 115 116 void snd_hdac_link_free_all(struct hdac_bus *bus) 117 { 118 struct hdac_ext_link *l; 119 120 while (!list_empty(&bus->hlink_list)) { 121 l = list_first_entry(&bus->hlink_list, struct hdac_ext_link, list); 122 list_del(&l->list); 123 kfree(l); 124 } 125 } 126 EXPORT_SYMBOL_GPL(snd_hdac_link_free_all); 127 128 /** 129 * snd_hdac_ext_bus_link_at - get link at specified address 130 * @bus: link's parent bus device 131 * @addr: codec device address 132 * 133 * Returns link object or NULL if matching link is not found. 134 */ 135 struct hdac_ext_link *snd_hdac_ext_bus_link_at(struct hdac_bus *bus, int addr) 136 { 137 struct hdac_ext_link *hlink; 138 int i; 139 140 list_for_each_entry(hlink, &bus->hlink_list, list) 141 for (i = 0; i < HDA_MAX_CODECS; i++) 142 if (hlink->lsdiid & (0x1 << addr)) 143 return hlink; 144 return NULL; 145 } 146 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_at); 147 148 /** 149 * snd_hdac_ext_bus_get_link - get link based on codec name 150 * @bus: the pointer to HDAC bus object 151 * @codec_name: codec name 152 */ 153 struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_bus *bus, 154 const char *codec_name) 155 { 156 int bus_idx, addr; 157 158 if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2) 159 return NULL; 160 if (bus->idx != bus_idx) 161 return NULL; 162 if (addr < 0 || addr > 31) 163 return NULL; 164 165 return snd_hdac_ext_bus_link_at(bus, addr); 166 } 167 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link); 168 169 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable) 170 { 171 int timeout; 172 u32 val; 173 int mask = (1 << AZX_MLCTL_CPA_SHIFT); 174 175 udelay(3); 176 timeout = 150; 177 178 do { 179 val = readl(link->ml_addr + AZX_REG_ML_LCTL); 180 if (enable) { 181 if (((val & mask) >> AZX_MLCTL_CPA_SHIFT)) 182 return 0; 183 } else { 184 if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT)) 185 return 0; 186 } 187 udelay(3); 188 } while (--timeout); 189 190 return -EIO; 191 } 192 193 /** 194 * snd_hdac_ext_bus_link_power_up -power up hda link 195 * @link: HD-audio extended link 196 */ 197 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link) 198 { 199 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 200 AZX_MLCTL_SPA, 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 * @bus: the pointer to HDAC bus object 221 */ 222 int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus) 223 { 224 struct hdac_ext_link *hlink = NULL; 225 int ret; 226 227 list_for_each_entry(hlink, &bus->hlink_list, list) { 228 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, 229 AZX_MLCTL_SPA, 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 * @bus: the pointer to HDAC bus object 242 */ 243 int snd_hdac_ext_bus_link_power_down_all(struct hdac_bus *bus) 244 { 245 struct hdac_ext_link *hlink = NULL; 246 int ret; 247 248 list_for_each_entry(hlink, &bus->hlink_list, list) { 249 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, 250 AZX_MLCTL_SPA, 0); 251 ret = check_hdac_link_power_active(hlink, false); 252 if (ret < 0) 253 return ret; 254 } 255 256 return 0; 257 } 258 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all); 259 260 int snd_hdac_ext_bus_link_get(struct hdac_bus *bus, 261 struct hdac_ext_link *link) 262 { 263 unsigned long codec_mask; 264 int ret = 0; 265 266 mutex_lock(&bus->lock); 267 268 /* 269 * if we move from 0 to 1, count will be 1 so power up this link 270 * as well, also check the dma status and trigger that 271 */ 272 if (++link->ref_count == 1) { 273 if (!bus->cmd_dma_state) { 274 snd_hdac_bus_init_cmd_io(bus); 275 bus->cmd_dma_state = true; 276 } 277 278 ret = snd_hdac_ext_bus_link_power_up(link); 279 280 /* 281 * clear the register to invalidate all the output streams 282 */ 283 snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, 284 ML_LOSIDV_STREAM_MASK, 0); 285 /* 286 * wait for 521usec for codec to report status 287 * HDA spec section 4.3 - Codec Discovery 288 */ 289 udelay(521); 290 codec_mask = snd_hdac_chip_readw(bus, STATESTS); 291 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", codec_mask); 292 snd_hdac_chip_writew(bus, STATESTS, codec_mask); 293 if (!bus->codec_mask) 294 bus->codec_mask = codec_mask; 295 } 296 297 mutex_unlock(&bus->lock); 298 return ret; 299 } 300 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get); 301 302 int snd_hdac_ext_bus_link_put(struct hdac_bus *bus, 303 struct hdac_ext_link *link) 304 { 305 int ret = 0; 306 struct hdac_ext_link *hlink; 307 bool link_up = false; 308 309 mutex_lock(&bus->lock); 310 311 /* 312 * if we move from 1 to 0, count will be 0 313 * so power down this link as well 314 */ 315 if (--link->ref_count == 0) { 316 ret = snd_hdac_ext_bus_link_power_down(link); 317 318 /* 319 * now check if all links are off, if so turn off 320 * cmd dma as well 321 */ 322 list_for_each_entry(hlink, &bus->hlink_list, list) { 323 if (hlink->ref_count) { 324 link_up = true; 325 break; 326 } 327 } 328 329 if (!link_up) { 330 snd_hdac_bus_stop_cmd_io(bus); 331 bus->cmd_dma_state = false; 332 } 333 } 334 335 mutex_unlock(&bus->lock); 336 return ret; 337 } 338 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put); 339 340 static void hdac_ext_codec_link_up(struct hdac_device *codec) 341 { 342 const char *devname = dev_name(&codec->dev); 343 struct hdac_ext_link *hlink = 344 snd_hdac_ext_bus_get_link(codec->bus, devname); 345 346 if (hlink) 347 snd_hdac_ext_bus_link_get(codec->bus, hlink); 348 } 349 350 static void hdac_ext_codec_link_down(struct hdac_device *codec) 351 { 352 const char *devname = dev_name(&codec->dev); 353 struct hdac_ext_link *hlink = 354 snd_hdac_ext_bus_get_link(codec->bus, devname); 355 356 if (hlink) 357 snd_hdac_ext_bus_link_put(codec->bus, hlink); 358 } 359 360 void snd_hdac_ext_bus_link_power(struct hdac_device *codec, bool enable) 361 { 362 struct hdac_bus *bus = codec->bus; 363 bool oldstate = test_bit(codec->addr, &bus->codec_powered); 364 365 if (enable == oldstate) 366 return; 367 368 snd_hdac_bus_link_power(codec, enable); 369 370 if (enable) 371 hdac_ext_codec_link_up(codec); 372 else 373 hdac_ext_codec_link_down(codec); 374 } 375 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power); 376