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 * maximum HDAC capablities we should parse to avoid endless looping: 19 * currently we have 4 extended caps, so this is future proof for now. 20 * extend when this limit is seen meeting in real HW 21 */ 22 #define HDAC_MAX_CAPS 10 23 24 /* 25 * processing pipe helpers - these helpers are useful for dealing with HDA 26 * new capability of processing pipelines 27 */ 28 29 /** 30 * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability 31 * @bus: the pointer to HDAC bus object 32 * @enable: flag to turn on/off the capability 33 */ 34 void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *bus, bool enable) 35 { 36 37 if (!bus->ppcap) { 38 dev_err(bus->dev, "Address of PP capability is NULL"); 39 return; 40 } 41 42 if (enable) 43 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 44 AZX_PPCTL_GPROCEN, AZX_PPCTL_GPROCEN); 45 else 46 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 47 AZX_PPCTL_GPROCEN, 0); 48 } 49 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable); 50 51 /** 52 * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable 53 * @bus: the pointer to HDAC bus object 54 * @enable: flag to enable/disable interrupt 55 */ 56 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *bus, bool enable) 57 { 58 59 if (!bus->ppcap) { 60 dev_err(bus->dev, "Address of PP capability is NULL\n"); 61 return; 62 } 63 64 if (enable) 65 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 66 AZX_PPCTL_PIE, AZX_PPCTL_PIE); 67 else 68 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, 69 AZX_PPCTL_PIE, 0); 70 } 71 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable); 72 73 /* 74 * Multilink helpers - these helpers are useful for dealing with HDA 75 * new multilink capability 76 */ 77 78 /** 79 * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability 80 * @bus: the pointer to HDAC bus object 81 * 82 * This will parse all links and read the mlink capabilities and add them 83 * in hlink_list of extended hdac bus 84 * Note: this will be freed on bus exit by driver 85 */ 86 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus) 87 { 88 int idx; 89 u32 link_count; 90 struct hdac_ext_link *hlink; 91 92 link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1; 93 94 dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count); 95 96 for (idx = 0; idx < link_count; idx++) { 97 hlink = kzalloc(sizeof(*hlink), GFP_KERNEL); 98 if (!hlink) 99 return -ENOMEM; 100 hlink->index = idx; 101 hlink->bus = bus; 102 hlink->ml_addr = bus->mlcap + AZX_ML_BASE + 103 (AZX_ML_INTERVAL * idx); 104 hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP); 105 hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID); 106 107 /* since link in On, update the ref */ 108 hlink->ref_count = 1; 109 110 list_add_tail(&hlink->list, &bus->hlink_list); 111 } 112 113 return 0; 114 } 115 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities); 116 117 /** 118 * snd_hdac_link_free_all- free hdac extended link objects 119 * 120 * @bus: the pointer to HDAC bus object 121 */ 122 123 void snd_hdac_link_free_all(struct hdac_bus *bus) 124 { 125 struct hdac_ext_link *l; 126 127 while (!list_empty(&bus->hlink_list)) { 128 l = list_first_entry(&bus->hlink_list, struct hdac_ext_link, list); 129 list_del(&l->list); 130 kfree(l); 131 } 132 } 133 EXPORT_SYMBOL_GPL(snd_hdac_link_free_all); 134 135 /** 136 * snd_hdac_ext_bus_get_link_index - get link based on codec name 137 * @bus: the pointer to HDAC bus object 138 * @codec_name: codec name 139 */ 140 struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_bus *bus, 141 const char *codec_name) 142 { 143 int i; 144 struct hdac_ext_link *hlink = NULL; 145 int bus_idx, addr; 146 147 if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2) 148 return NULL; 149 if (bus->idx != bus_idx) 150 return NULL; 151 152 list_for_each_entry(hlink, &bus->hlink_list, list) { 153 for (i = 0; i < HDA_MAX_CODECS; i++) { 154 if (hlink->lsdiid & (0x1 << addr)) 155 return hlink; 156 } 157 } 158 159 return NULL; 160 } 161 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_link); 162 163 static int check_hdac_link_power_active(struct hdac_ext_link *link, bool enable) 164 { 165 int timeout; 166 u32 val; 167 int mask = (1 << AZX_MLCTL_CPA_SHIFT); 168 169 udelay(3); 170 timeout = 150; 171 172 do { 173 val = readl(link->ml_addr + AZX_REG_ML_LCTL); 174 if (enable) { 175 if (((val & mask) >> AZX_MLCTL_CPA_SHIFT)) 176 return 0; 177 } else { 178 if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT)) 179 return 0; 180 } 181 udelay(3); 182 } while (--timeout); 183 184 return -EIO; 185 } 186 187 /** 188 * snd_hdac_ext_bus_link_power_up -power up hda link 189 * @link: HD-audio extended link 190 */ 191 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *link) 192 { 193 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, 194 AZX_MLCTL_SPA, AZX_MLCTL_SPA); 195 196 return check_hdac_link_power_active(link, true); 197 } 198 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up); 199 200 /** 201 * snd_hdac_ext_bus_link_power_down -power down hda link 202 * @link: HD-audio extended link 203 */ 204 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *link) 205 { 206 snd_hdac_updatel(link->ml_addr, AZX_REG_ML_LCTL, AZX_MLCTL_SPA, 0); 207 208 return check_hdac_link_power_active(link, false); 209 } 210 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down); 211 212 /** 213 * snd_hdac_ext_bus_link_power_up_all -power up all hda link 214 * @bus: the pointer to HDAC bus object 215 */ 216 int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus) 217 { 218 struct hdac_ext_link *hlink = NULL; 219 int ret; 220 221 list_for_each_entry(hlink, &bus->hlink_list, list) { 222 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, 223 AZX_MLCTL_SPA, AZX_MLCTL_SPA); 224 ret = check_hdac_link_power_active(hlink, true); 225 if (ret < 0) 226 return ret; 227 } 228 229 return 0; 230 } 231 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all); 232 233 /** 234 * snd_hdac_ext_bus_link_power_down_all -power down all hda link 235 * @bus: the pointer to HDAC bus object 236 */ 237 int snd_hdac_ext_bus_link_power_down_all(struct hdac_bus *bus) 238 { 239 struct hdac_ext_link *hlink = NULL; 240 int ret; 241 242 list_for_each_entry(hlink, &bus->hlink_list, list) { 243 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, 244 AZX_MLCTL_SPA, 0); 245 ret = check_hdac_link_power_active(hlink, false); 246 if (ret < 0) 247 return ret; 248 } 249 250 return 0; 251 } 252 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all); 253 254 int snd_hdac_ext_bus_link_get(struct hdac_bus *bus, 255 struct hdac_ext_link *link) 256 { 257 unsigned long codec_mask; 258 int ret = 0; 259 260 mutex_lock(&bus->lock); 261 262 /* 263 * if we move from 0 to 1, count will be 1 so power up this link 264 * as well, also check the dma status and trigger that 265 */ 266 if (++link->ref_count == 1) { 267 if (!bus->cmd_dma_state) { 268 snd_hdac_bus_init_cmd_io(bus); 269 bus->cmd_dma_state = true; 270 } 271 272 ret = snd_hdac_ext_bus_link_power_up(link); 273 274 /* 275 * clear the register to invalidate all the output streams 276 */ 277 snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, 278 ML_LOSIDV_STREAM_MASK, 0); 279 /* 280 * wait for 521usec for codec to report status 281 * HDA spec section 4.3 - Codec Discovery 282 */ 283 udelay(521); 284 codec_mask = snd_hdac_chip_readw(bus, STATESTS); 285 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", codec_mask); 286 snd_hdac_chip_writew(bus, STATESTS, codec_mask); 287 if (!bus->codec_mask) 288 bus->codec_mask = codec_mask; 289 } 290 291 mutex_unlock(&bus->lock); 292 return ret; 293 } 294 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get); 295 296 int snd_hdac_ext_bus_link_put(struct hdac_bus *bus, 297 struct hdac_ext_link *link) 298 { 299 int ret = 0; 300 struct hdac_ext_link *hlink; 301 bool link_up = false; 302 303 mutex_lock(&bus->lock); 304 305 /* 306 * if we move from 1 to 0, count will be 0 307 * so power down this link as well 308 */ 309 if (--link->ref_count == 0) { 310 ret = snd_hdac_ext_bus_link_power_down(link); 311 312 /* 313 * now check if all links are off, if so turn off 314 * cmd dma as well 315 */ 316 list_for_each_entry(hlink, &bus->hlink_list, list) { 317 if (hlink->ref_count) { 318 link_up = true; 319 break; 320 } 321 } 322 323 if (!link_up) { 324 snd_hdac_bus_stop_cmd_io(bus); 325 bus->cmd_dma_state = false; 326 } 327 } 328 329 mutex_unlock(&bus->lock); 330 return ret; 331 } 332 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put); 333