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_SHIFT); 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_SHIFT)) 183 return 0; 184 } else { 185 if (!((val & mask) >> AZX_MLCTL_CPA_SHIFT)) 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); 321