brintos

brintos / linux-shallow public Read only

0
0
Text · 6.5 KiB · 6b2c83f Raw
295 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Intel SST generic IPC Support4 *5 * Copyright (C) 2015, Intel Corporation6 */7 8#include <linux/types.h>9#include <linux/kernel.h>10#include <linux/list.h>11#include <linux/wait.h>12#include <linux/module.h>13#include <linux/spinlock.h>14#include <linux/device.h>15#include <linux/slab.h>16#include <linux/workqueue.h>17#include <linux/sched.h>18#include <linux/delay.h>19#include <linux/platform_device.h>20#include <sound/asound.h>21 22#include "sst-dsp.h"23#include "sst-dsp-priv.h"24#include "sst-ipc.h"25 26/* IPC message timeout (msecs) */27#define IPC_TIMEOUT_MSECS	30028 29#define IPC_EMPTY_LIST_SIZE	830 31/* locks held by caller */32static struct ipc_message *msg_get_empty(struct sst_generic_ipc *ipc)33{34	struct ipc_message *msg = NULL;35 36	if (!list_empty(&ipc->empty_list)) {37		msg = list_first_entry(&ipc->empty_list, struct ipc_message,38			list);39		list_del(&msg->list);40	}41 42	return msg;43}44 45static int tx_wait_done(struct sst_generic_ipc *ipc,46	struct ipc_message *msg, struct sst_ipc_message *reply)47{48	unsigned long flags;49	int ret;50 51	/* wait for DSP completion (in all cases atm inc pending) */52	ret = wait_event_timeout(msg->waitq, msg->complete,53		msecs_to_jiffies(IPC_TIMEOUT_MSECS));54 55	spin_lock_irqsave(&ipc->dsp->spinlock, flags);56	if (ret == 0) {57		if (ipc->ops.shim_dbg != NULL)58			ipc->ops.shim_dbg(ipc, "message timeout");59 60		list_del(&msg->list);61		ret = -ETIMEDOUT;62	} else {63 64		/* copy the data returned from DSP */65		if (reply) {66			reply->header = msg->rx.header;67			if (reply->data)68				memcpy(reply->data, msg->rx.data, msg->rx.size);69		}70		ret = msg->errno;71	}72 73	list_add_tail(&msg->list, &ipc->empty_list);74	spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);75	return ret;76}77 78static int ipc_tx_message(struct sst_generic_ipc *ipc,79	struct sst_ipc_message request,80	struct sst_ipc_message *reply, int wait)81{82	struct ipc_message *msg;83	unsigned long flags;84 85	spin_lock_irqsave(&ipc->dsp->spinlock, flags);86 87	msg = msg_get_empty(ipc);88	if (msg == NULL) {89		spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);90		return -EBUSY;91	}92 93	msg->tx.header = request.header;94	msg->tx.size = request.size;95	msg->rx.header = 0;96	msg->rx.size = reply ? reply->size : 0;97	msg->wait = wait;98	msg->errno = 0;99	msg->pending = false;100	msg->complete = false;101 102	if ((request.size) && (ipc->ops.tx_data_copy != NULL))103		ipc->ops.tx_data_copy(msg, request.data, request.size);104 105	list_add_tail(&msg->list, &ipc->tx_list);106	schedule_work(&ipc->kwork);107	spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);108 109	if (wait)110		return tx_wait_done(ipc, msg, reply);111	else112		return 0;113}114 115static int msg_empty_list_init(struct sst_generic_ipc *ipc)116{117	int i;118 119	ipc->msg = kcalloc(IPC_EMPTY_LIST_SIZE, sizeof(struct ipc_message),120			   GFP_KERNEL);121	if (ipc->msg == NULL)122		return -ENOMEM;123 124	for (i = 0; i < IPC_EMPTY_LIST_SIZE; i++) {125		ipc->msg[i].tx.data = kzalloc(ipc->tx_data_max_size, GFP_KERNEL);126		if (ipc->msg[i].tx.data == NULL)127			goto free_mem;128 129		ipc->msg[i].rx.data = kzalloc(ipc->rx_data_max_size, GFP_KERNEL);130		if (ipc->msg[i].rx.data == NULL) {131			kfree(ipc->msg[i].tx.data);132			goto free_mem;133		}134 135		init_waitqueue_head(&ipc->msg[i].waitq);136		list_add(&ipc->msg[i].list, &ipc->empty_list);137	}138 139	return 0;140 141free_mem:142	while (i > 0) {143		kfree(ipc->msg[i-1].tx.data);144		kfree(ipc->msg[i-1].rx.data);145		--i;146	}147	kfree(ipc->msg);148 149	return -ENOMEM;150}151 152static void ipc_tx_msgs(struct work_struct *work)153{154	struct sst_generic_ipc *ipc =155		container_of(work, struct sst_generic_ipc, kwork);156	struct ipc_message *msg;157 158	spin_lock_irq(&ipc->dsp->spinlock);159 160	while (!list_empty(&ipc->tx_list) && !ipc->pending) {161		/* if the DSP is busy, we will TX messages after IRQ.162		 * also postpone if we are in the middle of processing163		 * completion irq164		 */165		if (ipc->ops.is_dsp_busy && ipc->ops.is_dsp_busy(ipc->dsp)) {166			dev_dbg(ipc->dev, "ipc_tx_msgs dsp busy\n");167			break;168		}169 170		msg = list_first_entry(&ipc->tx_list, struct ipc_message, list);171		list_move(&msg->list, &ipc->rx_list);172 173		if (ipc->ops.tx_msg != NULL)174			ipc->ops.tx_msg(ipc, msg);175	}176 177	spin_unlock_irq(&ipc->dsp->spinlock);178}179 180int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc,181	struct sst_ipc_message request, struct sst_ipc_message *reply)182{183	int ret;184 185	/*186	 * DSP maybe in lower power active state, so187	 * check if the DSP supports DSP lp On method188	 * if so invoke that before sending IPC189	 */190	if (ipc->ops.check_dsp_lp_on)191		if (ipc->ops.check_dsp_lp_on(ipc->dsp, true))192			return -EIO;193 194	ret = ipc_tx_message(ipc, request, reply, 1);195 196	if (ipc->ops.check_dsp_lp_on)197		if (ipc->ops.check_dsp_lp_on(ipc->dsp, false))198			return -EIO;199 200	return ret;201}202EXPORT_SYMBOL_GPL(sst_ipc_tx_message_wait);203 204int sst_ipc_tx_message_nowait(struct sst_generic_ipc *ipc,205	struct sst_ipc_message request)206{207	return ipc_tx_message(ipc, request, NULL, 0);208}209EXPORT_SYMBOL_GPL(sst_ipc_tx_message_nowait);210 211int sst_ipc_tx_message_nopm(struct sst_generic_ipc *ipc,212	struct sst_ipc_message request, struct sst_ipc_message *reply)213{214	return ipc_tx_message(ipc, request, reply, 1);215}216EXPORT_SYMBOL_GPL(sst_ipc_tx_message_nopm);217 218struct ipc_message *sst_ipc_reply_find_msg(struct sst_generic_ipc *ipc,219	u64 header)220{221	struct ipc_message *msg;222	u64 mask;223 224	if (ipc->ops.reply_msg_match != NULL)225		header = ipc->ops.reply_msg_match(header, &mask);226	else227		mask = (u64)-1;228 229	if (list_empty(&ipc->rx_list)) {230		dev_err(ipc->dev, "error: rx list empty but received 0x%llx\n",231			header);232		return NULL;233	}234 235	list_for_each_entry(msg, &ipc->rx_list, list) {236		if ((msg->tx.header & mask) == header)237			return msg;238	}239 240	return NULL;241}242EXPORT_SYMBOL_GPL(sst_ipc_reply_find_msg);243 244/* locks held by caller */245void sst_ipc_tx_msg_reply_complete(struct sst_generic_ipc *ipc,246	struct ipc_message *msg)247{248	msg->complete = true;249 250	if (!msg->wait)251		list_add_tail(&msg->list, &ipc->empty_list);252	else253		wake_up(&msg->waitq);254}255EXPORT_SYMBOL_GPL(sst_ipc_tx_msg_reply_complete);256 257int sst_ipc_init(struct sst_generic_ipc *ipc)258{259	int ret;260 261	INIT_LIST_HEAD(&ipc->tx_list);262	INIT_LIST_HEAD(&ipc->rx_list);263	INIT_LIST_HEAD(&ipc->empty_list);264	init_waitqueue_head(&ipc->wait_txq);265 266	ret = msg_empty_list_init(ipc);267	if (ret < 0)268		return -ENOMEM;269 270	INIT_WORK(&ipc->kwork, ipc_tx_msgs);271	return 0;272}273EXPORT_SYMBOL_GPL(sst_ipc_init);274 275void sst_ipc_fini(struct sst_generic_ipc *ipc)276{277	int i;278 279	cancel_work_sync(&ipc->kwork);280 281	if (ipc->msg) {282		for (i = 0; i < IPC_EMPTY_LIST_SIZE; i++) {283			kfree(ipc->msg[i].tx.data);284			kfree(ipc->msg[i].rx.data);285		}286		kfree(ipc->msg);287	}288}289EXPORT_SYMBOL_GPL(sst_ipc_fini);290 291/* Module information */292MODULE_AUTHOR("Jin Yao");293MODULE_DESCRIPTION("Intel SST IPC generic");294MODULE_LICENSE("GPL v2");295