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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * HD-audio core bus driver4 */5 6#include <linux/init.h>7#include <linux/io.h>8#include <linux/device.h>9#include <linux/module.h>10#include <linux/export.h>11#include <sound/hdaudio.h>12#include "local.h"13#include "trace.h"14 15static void snd_hdac_bus_process_unsol_events(struct work_struct *work);16 17static const struct hdac_bus_ops default_ops = {18 .command = snd_hdac_bus_send_cmd,19 .get_response = snd_hdac_bus_get_response,20 .link_power = snd_hdac_bus_link_power,21};22 23/**24 * snd_hdac_bus_init - initialize a HD-audio bas bus25 * @bus: the pointer to bus object26 * @dev: device pointer27 * @ops: bus verb operators28 *29 * Returns 0 if successful, or a negative error code.30 */31int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,32 const struct hdac_bus_ops *ops)33{34 memset(bus, 0, sizeof(*bus));35 bus->dev = dev;36 if (ops)37 bus->ops = ops;38 else39 bus->ops = &default_ops;40 bus->dma_type = SNDRV_DMA_TYPE_DEV;41 INIT_LIST_HEAD(&bus->stream_list);42 INIT_LIST_HEAD(&bus->codec_list);43 INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events);44 spin_lock_init(&bus->reg_lock);45 mutex_init(&bus->cmd_mutex);46 mutex_init(&bus->lock);47 INIT_LIST_HEAD(&bus->hlink_list);48 init_waitqueue_head(&bus->rirb_wq);49 bus->irq = -1;50 51 /*52 * Default value of '8' is as per the HD audio specification (Rev 1.0a).53 * Following relation is used to derive STRIPE control value.54 * For sample rate <= 48K:55 * { ((num_channels * bits_per_sample) / number of SDOs) >= 8 }56 * For sample rate > 48K:57 * { ((num_channels * bits_per_sample * rate/48000) /58 * number of SDOs) >= 8 }59 */60 bus->sdo_limit = 8;61 62 return 0;63}64EXPORT_SYMBOL_GPL(snd_hdac_bus_init);65 66/**67 * snd_hdac_bus_exit - clean up a HD-audio bas bus68 * @bus: the pointer to bus object69 */70void snd_hdac_bus_exit(struct hdac_bus *bus)71{72 WARN_ON(!list_empty(&bus->stream_list));73 WARN_ON(!list_empty(&bus->codec_list));74 cancel_work_sync(&bus->unsol_work);75}76EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);77 78/**79 * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus80 * @bus: bus object81 * @addr: the HDAC device address82 * @cmd: HD-audio encoded verb83 * @res: pointer to store the response, NULL if performing asynchronously84 *85 * Returns 0 if successful, or a negative error code.86 */87int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,88 unsigned int cmd, unsigned int *res)89{90 int err;91 92 mutex_lock(&bus->cmd_mutex);93 err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);94 mutex_unlock(&bus->cmd_mutex);95 return err;96}97 98/**99 * snd_hdac_bus_exec_verb_unlocked - unlocked version100 * @bus: bus object101 * @addr: the HDAC device address102 * @cmd: HD-audio encoded verb103 * @res: pointer to store the response, NULL if performing asynchronously104 *105 * Returns 0 if successful, or a negative error code.106 */107int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,108 unsigned int cmd, unsigned int *res)109{110 unsigned int tmp;111 int err;112 113 if (cmd == ~0)114 return -EINVAL;115 116 if (res)117 *res = -1;118 else if (bus->sync_write)119 res = &tmp;120 for (;;) {121 trace_hda_send_cmd(bus, cmd);122 err = bus->ops->command(bus, cmd);123 if (err != -EAGAIN)124 break;125 /* process pending verbs */126 err = bus->ops->get_response(bus, addr, &tmp);127 if (err)128 break;129 }130 if (!err && res) {131 err = bus->ops->get_response(bus, addr, res);132 trace_hda_get_response(bus, addr, *res);133 }134 return err;135}136EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);137 138/**139 * snd_hdac_bus_queue_event - add an unsolicited event to queue140 * @bus: the BUS141 * @res: unsolicited event (lower 32bit of RIRB entry)142 * @res_ex: codec addr and flags (upper 32bit or RIRB entry)143 *144 * Adds the given event to the queue. The events are processed in145 * the workqueue asynchronously. Call this function in the interrupt146 * hanlder when RIRB receives an unsolicited event.147 */148void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)149{150 unsigned int wp;151 152 if (!bus)153 return;154 155 trace_hda_unsol_event(bus, res, res_ex);156 wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;157 bus->unsol_wp = wp;158 159 wp <<= 1;160 bus->unsol_queue[wp] = res;161 bus->unsol_queue[wp + 1] = res_ex;162 163 schedule_work(&bus->unsol_work);164}165 166/*167 * process queued unsolicited events168 */169static void snd_hdac_bus_process_unsol_events(struct work_struct *work)170{171 struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);172 struct hdac_device *codec;173 struct hdac_driver *drv;174 unsigned int rp, caddr, res;175 176 spin_lock_irq(&bus->reg_lock);177 while (bus->unsol_rp != bus->unsol_wp) {178 rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;179 bus->unsol_rp = rp;180 rp <<= 1;181 res = bus->unsol_queue[rp];182 caddr = bus->unsol_queue[rp + 1];183 if (!(caddr & (1 << 4))) /* no unsolicited event? */184 continue;185 codec = bus->caddr_tbl[caddr & 0x0f];186 if (!codec || !codec->registered)187 continue;188 spin_unlock_irq(&bus->reg_lock);189 drv = drv_to_hdac_driver(codec->dev.driver);190 if (drv->unsol_event)191 drv->unsol_event(codec, res);192 spin_lock_irq(&bus->reg_lock);193 }194 spin_unlock_irq(&bus->reg_lock);195}196 197/**198 * snd_hdac_bus_add_device - Add a codec to bus199 * @bus: HDA core bus200 * @codec: HDA core device to add201 *202 * Adds the given codec to the list in the bus. The caddr_tbl array203 * and codec_powered bits are updated, as well.204 * Returns zero if success, or a negative error code.205 */206int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)207{208 if (bus->caddr_tbl[codec->addr]) {209 dev_err(bus->dev, "address 0x%x is already occupied\n",210 codec->addr);211 return -EBUSY;212 }213 214 list_add_tail(&codec->list, &bus->codec_list);215 bus->caddr_tbl[codec->addr] = codec;216 set_bit(codec->addr, &bus->codec_powered);217 bus->num_codecs++;218 return 0;219}220 221/**222 * snd_hdac_bus_remove_device - Remove a codec from bus223 * @bus: HDA core bus224 * @codec: HDA core device to remove225 */226void snd_hdac_bus_remove_device(struct hdac_bus *bus,227 struct hdac_device *codec)228{229 WARN_ON(bus != codec->bus);230 if (list_empty(&codec->list))231 return;232 list_del_init(&codec->list);233 bus->caddr_tbl[codec->addr] = NULL;234 clear_bit(codec->addr, &bus->codec_powered);235 bus->num_codecs--;236 flush_work(&bus->unsol_work);237}238 239#ifdef CONFIG_SND_HDA_ALIGNED_MMIO240/* Helpers for aligned read/write of mmio space, for Tegra */241unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask)242{243 void __iomem *aligned_addr =244 (void __iomem *)((unsigned long)(addr) & ~0x3);245 unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;246 unsigned int v;247 248 v = readl(aligned_addr);249 return (v >> shift) & mask;250}251EXPORT_SYMBOL_GPL(snd_hdac_aligned_read);252 253void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,254 unsigned int mask)255{256 void __iomem *aligned_addr =257 (void __iomem *)((unsigned long)(addr) & ~0x3);258 unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;259 unsigned int v;260 261 v = readl(aligned_addr);262 v &= ~(mask << shift);263 v |= val << shift;264 writel(v, aligned_addr);265}266EXPORT_SYMBOL_GPL(snd_hdac_aligned_write);267#endif /* CONFIG_SND_HDA_ALIGNED_MMIO */268 269void snd_hdac_codec_link_up(struct hdac_device *codec)270{271 struct hdac_bus *bus = codec->bus;272 273 if (bus->ops->link_power)274 bus->ops->link_power(codec, true);275 else276 snd_hdac_bus_link_power(codec, true);277}278EXPORT_SYMBOL_GPL(snd_hdac_codec_link_up);279 280void snd_hdac_codec_link_down(struct hdac_device *codec)281{282 struct hdac_bus *bus = codec->bus;283 284 if (bus->ops->link_power)285 bus->ops->link_power(codec, false);286 else287 snd_hdac_bus_link_power(codec, false);288}289EXPORT_SYMBOL_GPL(snd_hdac_codec_link_down);290