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