ASoC: Intel: Refactor common IPC/mailbox code into generic APIs

Currently in Intel SST driver, some similar IPC/mailbox processing
code are used in different platforms (e.g. in baytrail/broadwell).

This patch extracts the common code and creates new files
(sst-ipc.c/sst-ipc.h) to contain the common code and provide the generic
APIs for IPC/mailbox processing.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 387 insertions, 1 deletions

diff --git a/sound/soc/intel/common/Makefile b/sound/soc/intel/common/Makefile
index 3df0e1ca76c0..f24154ca4e98 100644
--- a/sound/soc/intel/common/Makefile
+++ b/sound/soc/intel/common/Makefile
@@ -1,6 +1,7 @@
 snd-soc-sst-dsp-objs := sst-dsp.o sst-firmware.o
 snd-soc-sst-acpi-objs := sst-acpi.o
+snd-soc-sst-ipc-objs := sst-ipc.o
 
-obj-$(CONFIG_SND_SOC_INTEL_SST) += snd-soc-sst-dsp.o
+obj-$(CONFIG_SND_SOC_INTEL_SST) += snd-soc-sst-dsp.o snd-soc-sst-ipc.o
 obj-$(CONFIG_SND_SOC_INTEL_SST_ACPI) += snd-soc-sst-acpi.o
 
diff --git a/sound/soc/intel/common/sst-ipc.c b/sound/soc/intel/common/sst-ipc.c
new file mode 100644
index 000000000000..4b62a553823c
--- /dev/null
+++ b/sound/soc/intel/common/sst-ipc.c
@@ -0,0 +1,294 @@
+/*
+ * Intel SST generic IPC Support
+ *
+ * Copyright (C) 2015, Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/wait.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/kthread.h>
+#include <sound/asound.h>
+
+#include "sst-dsp.h"
+#include "sst-dsp-priv.h"
+#include "sst-ipc.h"
+
+/* IPC message timeout (msecs) */
+#define IPC_TIMEOUT_MSECS       300
+
+#define IPC_EMPTY_LIST_SIZE     8
+
+/* locks held by caller */
+static struct ipc_message *msg_get_empty(struct sst_generic_ipc *ipc)
+{
+        struct ipc_message *msg = NULL;
+
+        if (!list_empty(&ipc->empty_list)) {
+                msg = list_first_entry(&ipc->empty_list, struct ipc_message,
+                        list);
+                list_del(&msg->list);
+        }
+
+        return msg;
+}
+
+static int tx_wait_done(struct sst_generic_ipc *ipc,
+        struct ipc_message *msg, void *rx_data)
+{
+        unsigned long flags;
+        int ret;
+
+        /* wait for DSP completion (in all cases atm inc pending) */
+        ret = wait_event_timeout(msg->waitq, msg->complete,
+                msecs_to_jiffies(IPC_TIMEOUT_MSECS));
+
+        spin_lock_irqsave(&ipc->dsp->spinlock, flags);
+        if (ret == 0) {
+                if (ipc->ops.shim_dbg != NULL)
+                        ipc->ops.shim_dbg(ipc, "message timeout");
+
+                list_del(&msg->list);
+                ret = -ETIMEDOUT;
+        } else {
+
+                /* copy the data returned from DSP */
+                if (msg->rx_size)
+                        memcpy(rx_data, msg->rx_data, msg->rx_size);
+                ret = msg->errno;
+        }
+
+        list_add_tail(&msg->list, &ipc->empty_list);
+        spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+        return ret;
+}
+
+static int ipc_tx_message(struct sst_generic_ipc *ipc, u64 header,
+        void *tx_data, size_t tx_bytes, void *rx_data,
+        size_t rx_bytes, int wait)
+{
+        struct ipc_message *msg;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ipc->dsp->spinlock, flags);
+
+        msg = msg_get_empty(ipc);
+        if (msg == NULL) {
+                spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+                return -EBUSY;
+        }
+
+        msg->header = header;
+        msg->tx_size = tx_bytes;
+        msg->rx_size = rx_bytes;
+        msg->wait = wait;
+        msg->errno = 0;
+        msg->pending = false;
+        msg->complete = false;
+
+        if ((tx_bytes) && (ipc->ops.tx_data_copy != NULL))
+                ipc->ops.tx_data_copy(msg, tx_data, tx_bytes);
+
+        list_add_tail(&msg->list, &ipc->tx_list);
+        spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+
+        queue_kthread_work(&ipc->kworker, &ipc->kwork);
+
+        if (wait)
+                return tx_wait_done(ipc, msg, rx_data);
+        else
+                return 0;
+}
+
+static int msg_empty_list_init(struct sst_generic_ipc *ipc)
+{
+        int i;
+
+        ipc->msg = kzalloc(sizeof(struct ipc_message) *
+                IPC_EMPTY_LIST_SIZE, GFP_KERNEL);
+        if (ipc->msg == NULL)
+                return -ENOMEM;
+
+        for (i = 0; i < IPC_EMPTY_LIST_SIZE; i++) {
+                init_waitqueue_head(&ipc->msg[i].waitq);
+                list_add(&ipc->msg[i].list, &ipc->empty_list);
+        }
+
+        return 0;
+}
+
+static void ipc_tx_msgs(struct kthread_work *work)
+{
+        struct sst_generic_ipc *ipc =
+                container_of(work, struct sst_generic_ipc, kwork);
+        struct ipc_message *msg;
+        unsigned long flags;
+        u64 ipcx;
+
+        spin_lock_irqsave(&ipc->dsp->spinlock, flags);
+
+        if (list_empty(&ipc->tx_list) || ipc->pending) {
+                spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+                return;
+        }
+
+        /* if the DSP is busy, we will TX messages after IRQ.
+         * also postpone if we are in the middle of procesing completion irq*/
+        ipcx = sst_dsp_shim_read_unlocked(ipc->dsp, SST_IPCX);
+        if (ipcx & (SST_IPCX_BUSY | SST_IPCX_DONE)) {
+                spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+                return;
+        }
+
+        msg = list_first_entry(&ipc->tx_list, struct ipc_message, list);
+        list_move(&msg->list, &ipc->rx_list);
+
+        if (ipc->ops.tx_msg != NULL)
+                ipc->ops.tx_msg(ipc, msg);
+
+        spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+}
+
+int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc, u64 header,
+        void *tx_data, size_t tx_bytes, void *rx_data, size_t rx_bytes)
+{
+        return ipc_tx_message(ipc, header, tx_data, tx_bytes,
+                rx_data, rx_bytes, 1);
+}
+EXPORT_SYMBOL_GPL(sst_ipc_tx_message_wait);
+
+int sst_ipc_tx_message_nowait(struct sst_generic_ipc *ipc, u64 header,
+        void *tx_data, size_t tx_bytes)
+{
+        return ipc_tx_message(ipc, header, tx_data, tx_bytes,
+                NULL, 0, 0);
+}
+EXPORT_SYMBOL_GPL(sst_ipc_tx_message_nowait);
+
+struct ipc_message *sst_ipc_reply_find_msg(struct sst_generic_ipc *ipc,
+        u64 header)
+{
+        struct ipc_message *msg;
+        u64 mask;
+
+        if (ipc->ops.reply_msg_match != NULL)
+                header = ipc->ops.reply_msg_match(header, &mask);
+
+        if (list_empty(&ipc->rx_list)) {
+                dev_err(ipc->dev, "error: rx list empty but received 0x%llx\n",
+                        header);
+                return NULL;
+        }
+
+        list_for_each_entry(msg, &ipc->rx_list, list) {
+                if ((msg->header & mask) == header)
+                        return msg;
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(sst_ipc_reply_find_msg);
+
+/* locks held by caller */
+void sst_ipc_tx_msg_reply_complete(struct sst_generic_ipc *ipc,
+        struct ipc_message *msg)
+{
+        msg->complete = true;
+
+        if (!msg->wait)
+                list_add_tail(&msg->list, &ipc->empty_list);
+        else
+                wake_up(&msg->waitq);
+}
+EXPORT_SYMBOL_GPL(sst_ipc_tx_msg_reply_complete);
+
+void sst_ipc_drop_all(struct sst_generic_ipc *ipc)
+{
+        struct ipc_message *msg, *tmp;
+        unsigned long flags;
+        int tx_drop_cnt = 0, rx_drop_cnt = 0;
+
+        /* drop all TX and Rx messages before we stall + reset DSP */
+        spin_lock_irqsave(&ipc->dsp->spinlock, flags);
+
+        list_for_each_entry_safe(msg, tmp, &ipc->tx_list, list) {
+                list_move(&msg->list, &ipc->empty_list);
+                tx_drop_cnt++;
+        }
+
+        list_for_each_entry_safe(msg, tmp, &ipc->rx_list, list) {
+                list_move(&msg->list, &ipc->empty_list);
+                rx_drop_cnt++;
+        }
+
+        spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
+
+        if (tx_drop_cnt || rx_drop_cnt)
+                dev_err(ipc->dev, "dropped IPC msg RX=%d, TX=%d\n",
+                        tx_drop_cnt, rx_drop_cnt);
+}
+EXPORT_SYMBOL_GPL(sst_ipc_drop_all);
+
+int sst_ipc_init(struct sst_generic_ipc *ipc)
+{
+        int ret;
+
+        INIT_LIST_HEAD(&ipc->tx_list);
+        INIT_LIST_HEAD(&ipc->rx_list);
+        INIT_LIST_HEAD(&ipc->empty_list);
+        init_waitqueue_head(&ipc->wait_txq);
+
+        ret = msg_empty_list_init(ipc);
+        if (ret < 0)
+                return -ENOMEM;
+
+        /* start the IPC message thread */
+        init_kthread_worker(&ipc->kworker);
+        ipc->tx_thread = kthread_run(kthread_worker_fn,
+                                        &ipc->kworker, "%s",
+                                        dev_name(ipc->dev));
+        if (IS_ERR(ipc->tx_thread)) {
+                dev_err(ipc->dev, "error: failed to create message TX task\n");
+                ret = PTR_ERR(ipc->tx_thread);
+                kfree(ipc->msg);
+                return ret;
+        }
+
+        init_kthread_work(&ipc->kwork, ipc_tx_msgs);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(sst_ipc_init);
+
+void sst_ipc_fini(struct sst_generic_ipc *ipc)
+{
+        if (ipc->tx_thread)
+                kthread_stop(ipc->tx_thread);
+
+        if (ipc->msg)
+                kfree(ipc->msg);
+}
+EXPORT_SYMBOL_GPL(sst_ipc_fini);
+
+/* Module information */
+MODULE_AUTHOR("Jin Yao");
+MODULE_DESCRIPTION("Intel SST IPC generic");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/intel/common/sst-ipc.h b/sound/soc/intel/common/sst-ipc.h
new file mode 100644
index 000000000000..125ea451a373
--- /dev/null
+++ b/sound/soc/intel/common/sst-ipc.h
@@ -0,0 +1,91 @@
+/*
+ * Intel SST generic IPC Support
+ *
+ * Copyright (C) 2015, Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __SST_GENERIC_IPC_H
+#define __SST_GENERIC_IPC_H
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
+
+#define IPC_MAX_MAILBOX_BYTES   256
+
+struct ipc_message {
+        struct list_head list;
+        u64 header;
+
+        /* direction wrt host CPU */
+        char tx_data[IPC_MAX_MAILBOX_BYTES];
+        size_t tx_size;
+        char rx_data[IPC_MAX_MAILBOX_BYTES];
+        size_t rx_size;
+
+        wait_queue_head_t waitq;
+        bool pending;
+        bool complete;
+        bool wait;
+        int errno;
+};
+
+struct sst_generic_ipc;
+
+struct sst_plat_ipc_ops {
+        void (*tx_msg)(struct sst_generic_ipc *, struct ipc_message *);
+        void (*shim_dbg)(struct sst_generic_ipc *, const char *);
+        void (*tx_data_copy)(struct ipc_message *, char *, size_t);
+        u64  (*reply_msg_match)(u64 header, u64 *mask);
+};
+
+/* SST generic IPC data */
+struct sst_generic_ipc {
+        struct device *dev;
+        struct sst_dsp *dsp;
+
+        /* IPC messaging */
+        struct list_head tx_list;
+        struct list_head rx_list;
+        struct list_head empty_list;
+        wait_queue_head_t wait_txq;
+        struct task_struct *tx_thread;
+        struct kthread_worker kworker;
+        struct kthread_work kwork;
+        bool pending;
+        struct ipc_message *msg;
+
+        struct sst_plat_ipc_ops ops;
+};
+
+int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc, u64 header,
+        void *tx_data, size_t tx_bytes, void *rx_data, size_t rx_bytes);
+
+int sst_ipc_tx_message_nowait(struct sst_generic_ipc *ipc, u64 header,
+        void *tx_data, size_t tx_bytes);
+
+struct ipc_message *sst_ipc_reply_find_msg(struct sst_generic_ipc *ipc,
+        u64 header);
+
+void sst_ipc_tx_msg_reply_complete(struct sst_generic_ipc *ipc,
+        struct ipc_message *msg);
+
+void sst_ipc_drop_all(struct sst_generic_ipc *ipc);
+int sst_ipc_init(struct sst_generic_ipc *ipc);
+void sst_ipc_fini(struct sst_generic_ipc *ipc);
+
+#endif