Message-Id: <1298941892-25173-5-git-send-email-kheitke@codeaurora.org>
Date:	Mon, 28 Feb 2011 18:11:31 -0700
From:	Kenneth Heitke <kheitke@...eaurora.org>
To:	davidb@...eaurora.org, bryanh@...eaurora.org, dwalker@...o99.com
Cc:	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.intradead.org, yanhe@...eaurora.org,
	palnatim@...eaurora.org, subhashj@...eaurora.org,
	Amir Samuelovi <amirs@...eaurora.org>,
	Kenneth Heitke <kheitke@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org (open list:ARM PORT),
	linux-kernel@...r.kernel.org (open list)
Subject: [RFC PATCH 4/5] RFC: msm: sps: Smart Peripheral Subsystem (SPS) Resource Manager

From: Amir Samuelovi <amirs@...eaurora.org>

Resource management for the SPS device driver.

Signed-off-by: Amir Samuelov <amirs@...eaurora.org>
Signed-off-by: Kenneth Heitke <kheitke@...eaurora.org>
---
 arch/arm/mach-msm/sps/sps_rm.c |  806 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 806 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-msm/sps/sps_rm.c

diff --git a/arch/arm/mach-msm/sps/sps_rm.c b/arch/arm/mach-msm/sps/sps_rm.c
new file mode 100644
index 0000000..ec36b25
--- /dev/null
+++ b/arch/arm/mach-msm/sps/sps_rm.c
@@ -0,0 +1,806 @@
+/* Copyright (c) 2011, Code Aurora Forum. 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 and
+ * only 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.
+ */
+
+/* Resource management for the SPS device driver. */
+
+#include <linux/types.h>	/* u32 */
+#include <linux/kernel.h>	/* pr_info() */
+#include <linux/mutex.h>	/* mutex */
+#include <linux/list.h>		/* list_head */
+#include <linux/slab.h>		/* kzalloc() */
+#include <linux/memory.h>	/* memset */
+
+#include "spsi.h"
+#include "sps_core.h"
+
+/* "Clear" value for the connection parameter struct */
+#define SPSRM_CLEAR     0xcccccccc
+
+/* Max BAM FIFO sizes */
+#define SPSRM_MAX_DESC_FIFO_SIZE    0xffff
+#define SPSRM_MAX_DATA_FIFO_SIZE    0xffff
+
+/* Connection control struct pointer */
+static struct sps_rm *sps_rm;
+
+/**
+ * Initialize resource manager module
+ */
+int sps_rm_init(struct sps_rm *rm, u32 options)
+{
+	/* Set the resource manager state struct pointer */
+	sps_rm = rm;
+
+	/* Initialize the state struct */
+	INIT_LIST_HEAD(&sps_rm->connections_q);
+	mutex_init(&sps_rm->lock);
+
+	return 0;
+}
+
+/**
+ * Initialize client state context
+ *
+ */
+void sps_rm_config_init(struct sps_connect *connect)
+{
+	memset(connect, SPSRM_CLEAR, sizeof(*connect));
+}
+
+/**
+ * Remove reference to connection mapping
+ *
+ * This function removes a reference from a connection mapping struct.
+ *
+ * @map - pointer to connection mapping struct
+ *
+ */
+static void sps_rm_remove_ref(struct sps_connection *map)
+{
+	/* Free this connection */
+	map->refs--;
+	if (map->refs <= 0) {
+		if (map->client_src != NULL || map->client_dest != NULL)
+			SPS_ERR("Failed to allocate connection struct");
+
+		list_del(&map->list);
+		kfree(map);
+	}
+}
+
+/**
+ * Compare map to connect parameters
+ *
+ * This function compares client connect parameters to an allocated
+ * connection mapping.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ * @return - true if match, false otherwise
+ *
+ */
+static int sps_rm_map_match(const struct sps_connect *cfg,
+			    const struct sps_connection *map)
+{
+	if (cfg->source != map->src.dev ||
+	    cfg->destination != map->dest.dev)
+		return false;
+
+	if (cfg->src_pipe_index != SPSRM_CLEAR &&
+	    cfg->src_pipe_index != map->src.pipe_index)
+		return false;
+
+	if (cfg->dest_pipe_index != SPSRM_CLEAR &&
+	    cfg->dest_pipe_index != map->dest.pipe_index)
+		return false;
+
+	if (cfg->config != map->config)
+		return false;
+
+	if (cfg->desc.size != SPSRM_CLEAR) {
+		if (cfg->desc.size != map->desc.size)
+			return false;
+
+		if (cfg->desc.phys_base != SPSRM_CLEAR &&
+		    cfg->desc.base != (void *)SPSRM_CLEAR &&
+		    (cfg->desc.phys_base != map->desc.phys_base ||
+		     cfg->desc.base != map->desc.base)) {
+			return false;
+		}
+	}
+
+	if (cfg->data.size != SPSRM_CLEAR) {
+		if (cfg->data.size != map->data.size)
+			return false;
+
+		if (cfg->data.phys_base != SPSRM_CLEAR &&
+		    cfg->data.base != (void *)SPSRM_CLEAR &&
+		    (cfg->data.phys_base != map->data.phys_base ||
+		     cfg->data.base != map->data.base))
+			return false;
+	}
+
+	return true;
+}
+
+/**
+ * Find unconnected mapping
+ *
+ * This function finds an allocated a connection mapping.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ * @return - pointer to allocated connection mapping, or NULL if not found
+ *
+ */
+static struct sps_connection *find_unconnected(struct sps_pipe *pipe)
+{
+	struct sps_connect *cfg = &pipe->connect;
+	struct sps_connection *map;
+
+	/* Has this connection already been allocated? */
+	list_for_each_entry(map, &sps_rm->connections_q, list) {
+		if (sps_rm_map_match(cfg, map))
+			if ((cfg->mode == SPS_MODE_SRC
+			     && map->client_src == NULL)
+			    || (cfg->mode != SPS_MODE_SRC
+				&& map->client_dest == NULL))
+				return map;	/* Found */
+	}
+
+	return NULL;		/* Not Found */
+}
+
+/**
+ * Assign connection to client
+ *
+ * This function assigns a connection to a client.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ * @map - connection mapping
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+static int sps_rm_assign(struct sps_pipe *pipe,
+			 struct sps_connection *map)
+{
+	struct sps_connect *cfg = &pipe->connect;
+
+	/* Check ownership and BAM */
+	if ((cfg->mode == SPS_MODE_SRC && map->client_src != NULL) ||
+	    (cfg->mode != SPS_MODE_SRC && map->client_dest != NULL))
+		/* The end point is already connected */
+		return SPS_ERROR;
+
+	/* Check whether this end point is a BAM (not memory) */
+	if ((cfg->mode == SPS_MODE_SRC && map->src.bam == NULL) ||
+	    (cfg->mode != SPS_MODE_SRC && map->dest.bam == NULL))
+		return SPS_ERROR;
+
+	/* Record the connection assignment */
+	if (cfg->mode == SPS_MODE_SRC) {
+		map->client_src = pipe;
+		pipe->bam = map->src.bam;
+		pipe->pipe_index = map->src.pipe_index;
+		if (pipe->connect.event_thresh != SPSRM_CLEAR)
+			map->src.event_threshold = pipe->connect.event_thresh;
+	} else {
+		map->client_dest = pipe;
+		pipe->bam = map->dest.bam;
+		pipe->pipe_index = map->dest.pipe_index;
+		if (pipe->connect.event_thresh != SPSRM_CLEAR)
+			map->dest.event_threshold =
+			pipe->connect.event_thresh;
+	}
+	pipe->map = map;
+
+	SPS_DBG("sps:sps_rm_assign.pipe_index=%d\n", pipe->pipe_index);
+
+	/* Copy parameters to client connect state */
+	pipe->connect.src_pipe_index = map->src.pipe_index;
+	pipe->connect.dest_pipe_index = map->dest.pipe_index;
+	pipe->connect.desc = map->desc;
+	pipe->connect.data = map->data;
+
+	pipe->client_state = SPS_STATE_ALLOCATE;
+
+	return 0;
+}
+
+/**
+ * Free connection mapping resources
+ *
+ * This function frees a connection mapping resources.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ */
+static void sps_rm_free_map_rsrc(struct sps_connection *map)
+{
+	struct sps_bam *bam;
+
+	if (map->client_src != NULL || map->client_dest != NULL)
+		return;
+
+	if (map->alloc_src_pipe != SPS_BAM_PIPE_INVALID) {
+		bam = map->src.bam;
+		sps_bam_pipe_free(bam, map->src.pipe_index);
+
+		/* Is this a BAM-DMA pipe? */
+#ifdef CONFIG_SPS_SUPPORT_BAMDMA
+		if ((bam->props.options & SPS_BAM_OPT_BAMDMA))
+			/* Deallocate and free the BAM-DMA channel */
+			sps_dma_pipe_free(bam, map->src.pipe_index);
+#endif
+		map->alloc_src_pipe = SPS_BAM_PIPE_INVALID;
+		map->src.pipe_index = SPS_BAM_PIPE_INVALID;
+	}
+	if (map->alloc_dest_pipe != SPS_BAM_PIPE_INVALID) {
+		bam = map->dest.bam;
+		sps_bam_pipe_free(bam, map->dest.pipe_index);
+
+		/* Is this a BAM-DMA pipe? */
+#ifdef CONFIG_SPS_SUPPORT_BAMDMA
+		if ((bam->props.options & SPS_BAM_OPT_BAMDMA)) {
+			/* Deallocate the BAM-DMA channel */
+			sps_dma_pipe_free(bam, map->dest.pipe_index);
+		}
+#endif
+		map->alloc_dest_pipe = SPS_BAM_PIPE_INVALID;
+		map->dest.pipe_index = SPS_BAM_PIPE_INVALID;
+	}
+	if (map->alloc_desc_base != SPS_ADDR_INVALID) {
+		sps_mem_free_io(map->alloc_desc_base, map->desc.size);
+
+		map->alloc_desc_base = SPS_ADDR_INVALID;
+		map->desc.phys_base = SPS_ADDR_INVALID;
+	}
+	if (map->alloc_data_base != SPS_ADDR_INVALID) {
+		sps_mem_free_io(map->alloc_data_base, map->data.size);
+
+		map->alloc_data_base = SPS_ADDR_INVALID;
+		map->data.phys_base = SPS_ADDR_INVALID;
+	}
+}
+
+/**
+ * Init connection mapping from client connect
+ *
+ * This function initializes a connection mapping from the client's
+ * connect parameters.
+ *
+ * @map - connection mapping struct
+ *
+ * @cfg - client connect parameters
+ *
+ * @return - pointer to allocated connection mapping, or NULL on error
+ *
+ */
+static void sps_rm_init_map(struct sps_connection *map,
+			    const struct sps_connect *cfg)
+{
+	/* Clear the connection mapping struct */
+	memset(map, 0, sizeof(*map));
+	map->desc.phys_base = SPS_ADDR_INVALID;
+	map->data.phys_base = SPS_ADDR_INVALID;
+	map->alloc_desc_base = SPS_ADDR_INVALID;
+	map->alloc_data_base = SPS_ADDR_INVALID;
+	map->alloc_src_pipe = SPS_BAM_PIPE_INVALID;
+	map->alloc_dest_pipe = SPS_BAM_PIPE_INVALID;
+
+	/* Copy client required parameters */
+	map->src.dev = cfg->source;
+	map->dest.dev = cfg->destination;
+	map->desc.size = cfg->desc.size;
+	map->data.size = cfg->data.size;
+	map->config = cfg->config;
+
+	/* Did client specify descriptor FIFO? */
+	if (map->desc.size != SPSRM_CLEAR &&
+	    cfg->desc.phys_base != SPSRM_CLEAR &&
+	    cfg->desc.base != (void *)SPSRM_CLEAR)
+		map->desc = cfg->desc;
+
+	/* Did client specify data FIFO? */
+	if (map->data.size != SPSRM_CLEAR &&
+	    cfg->data.phys_base != SPSRM_CLEAR &&
+	    cfg->data.base != (void *)SPSRM_CLEAR)
+		map->data = cfg->data;
+
+	/* Did client specify source pipe? */
+	if (cfg->src_pipe_index != SPSRM_CLEAR)
+		map->src.pipe_index = cfg->src_pipe_index;
+	else
+		map->src.pipe_index = SPS_BAM_PIPE_INVALID;
+
+
+	/* Did client specify destination pipe? */
+	if (cfg->dest_pipe_index != SPSRM_CLEAR)
+		map->dest.pipe_index = cfg->dest_pipe_index;
+	else
+		map->dest.pipe_index = SPS_BAM_PIPE_INVALID;
+}
+
+/**
+ * Create a new connection mapping
+ *
+ * This function creates a new connection mapping.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ * @return - pointer to allocated connection mapping, or NULL on error
+ *
+ */
+static struct sps_connection *sps_rm_create(struct sps_pipe *pipe)
+{
+	struct sps_connection *map;
+	struct sps_bam *bam;
+	u32 desc_size;
+	u32 data_size;
+	enum sps_mode dir;
+	int success = false;
+
+	/* Allocate new connection */
+	map = kzalloc(sizeof(*map), GFP_KERNEL);
+	if (map == NULL) {
+		SPS_ERR("Failed to allocate connection struct");
+		return NULL;
+	}
+
+	/* Initialize connection struct */
+	sps_rm_init_map(map, &pipe->connect);
+	dir = pipe->connect.mode;
+
+	/* Use a do/while() loop to avoid a "goto" */
+	success = false;
+	/* Get BAMs */
+	map->src.bam = sps_h2bam(map->src.dev);
+	if (map->src.bam == NULL) {
+		if (map->src.dev != SPS_DEV_HANDLE_MEM) {
+			SPS_ERR("Invalid BAM handle: 0x%x", map->src.dev);
+			goto exit_err;
+		}
+		map->src.pipe_index = SPS_BAM_PIPE_INVALID;
+	}
+	map->dest.bam = sps_h2bam(map->dest.dev);
+	if (map->dest.bam == NULL) {
+		if (map->dest.dev != SPS_DEV_HANDLE_MEM) {
+			SPS_ERR("Invalid BAM handle: 0x%x", map->dest.dev);
+			goto exit_err;
+		}
+		map->dest.pipe_index = SPS_BAM_PIPE_INVALID;
+	}
+
+	/* Check the BAM device for the pipe */
+	if ((dir == SPS_MODE_SRC && map->src.bam == NULL) ||
+	    (dir != SPS_MODE_SRC && map->dest.bam == NULL)) {
+		SPS_ERR("Invalid BAM endpt: dir %d src 0x%x dest 0x%x",
+			dir, map->src.dev, map->dest.dev);
+		goto exit_err;
+	}
+
+	/* Allocate pipes and copy BAM parameters */
+	if (map->src.bam != NULL) {
+		/* Allocate the pipe */
+		bam = map->src.bam;
+		map->alloc_src_pipe = sps_bam_pipe_alloc(bam,
+							map->src.pipe_index);
+		if (map->alloc_src_pipe == SPS_BAM_PIPE_INVALID)
+			goto exit_err;
+		map->src.pipe_index = map->alloc_src_pipe;
+
+		/* Is this a BAM-DMA pipe? */
+#ifdef CONFIG_SPS_SUPPORT_BAMDMA
+		if ((bam->props.options & SPS_BAM_OPT_BAMDMA)) {
+			int rc;
+			/* Allocate the BAM-DMA channel */
+			rc = sps_dma_pipe_alloc(bam, map->src.pipe_index,
+						 SPS_MODE_SRC);
+			if (rc) {
+				SPS_ERR("Failed to alloc BAM-DMA pipe: %d",
+					map->src.pipe_index);
+				goto exit_err;
+			}
+		}
+#endif
+		map->src.bam_phys = bam->props.phys_addr;
+		map->src.event_threshold = bam->props.event_threshold;
+	}
+	if (map->dest.bam != NULL) {
+		/* Allocate the pipe */
+		bam = map->dest.bam;
+		map->alloc_dest_pipe = sps_bam_pipe_alloc(bam,
+							 map->dest.pipe_index);
+		if (map->alloc_dest_pipe == SPS_BAM_PIPE_INVALID)
+			goto exit_err;
+
+		map->dest.pipe_index = map->alloc_dest_pipe;
+
+		/* Is this a BAM-DMA pipe? */
+#ifdef CONFIG_SPS_SUPPORT_BAMDMA
+		if ((bam->props.options & SPS_BAM_OPT_BAMDMA)) {
+			int rc;
+			/* Allocate the BAM-DMA channel */
+			rc = sps_dma_pipe_alloc(bam, map->dest.pipe_index,
+					       SPS_MODE_DEST);
+			if (rc) {
+				SPS_ERR("Failed to alloc BAM-DMA pipe: %d",
+					map->dest.pipe_index);
+				goto exit_err;
+			}
+		}
+#endif
+		map->dest.bam_phys = bam->props.phys_addr;
+		map->dest.event_threshold =
+		bam->props.event_threshold;
+	}
+
+	/* Get default FIFO sizes */
+	desc_size = 0;
+	data_size = 0;
+	if (map->src.bam != NULL) {
+		bam = map->src.bam;
+		desc_size = bam->props.desc_size;
+		data_size = bam->props.data_size;
+	}
+	if (map->dest.bam != NULL) {
+		bam = map->dest.bam;
+		if (bam->props.desc_size > desc_size)
+			desc_size = bam->props.desc_size;
+		if (bam->props.data_size > data_size)
+			data_size = bam->props.data_size;
+	}
+
+	/* Set FIFO sizes */
+	if (map->desc.size == SPSRM_CLEAR)
+		map->desc.size = desc_size;
+	if (map->src.bam != NULL && map->dest.bam != NULL) {
+		/* BAM-to-BAM requires data FIFO */
+		if (map->data.size == SPSRM_CLEAR)
+			map->data.size = data_size;
+	} else {
+		map->data.size = 0;
+	}
+	if (map->desc.size > SPSRM_MAX_DESC_FIFO_SIZE) {
+		SPS_ERR("Invalid desc FIFO size: 0x%x",	map->desc.size);
+		goto exit_err;
+	}
+	if (map->src.bam != NULL && map->dest.bam != NULL &&
+	    map->data.size > SPSRM_MAX_DATA_FIFO_SIZE) {
+		SPS_ERR("Invalid data FIFO size: 0x%x",	map->data.size);
+		goto exit_err;
+	}
+
+	/* Allocate descriptor FIFO if necessary */
+	if (map->desc.size && map->desc.phys_base == SPS_ADDR_INVALID) {
+		map->alloc_desc_base = sps_mem_alloc_io(map->desc.size);
+		if (map->alloc_desc_base == SPS_ADDR_INVALID) {
+			SPS_ERR("I/O memory allocation failure: 0x%x",
+				map->desc.size);
+			goto exit_err;
+		}
+		map->desc.phys_base = map->alloc_desc_base;
+		map->desc.base = spsi_get_mem_ptr(map->desc.phys_base);
+		if (map->desc.base == NULL) {
+			SPS_ERR("Cannot get virt addr for I/O buffer: 0x%x",
+				map->desc.phys_base);
+			goto exit_err;
+		}
+	}
+
+	/* Allocate data FIFO if necessary */
+	if (map->data.size && map->data.phys_base == SPS_ADDR_INVALID) {
+		map->alloc_data_base = sps_mem_alloc_io(map->data.size);
+		if (map->alloc_data_base == SPS_ADDR_INVALID) {
+			SPS_ERR("I/O memory allocation failure: 0x%x",
+				map->data.size);
+			goto exit_err;
+		}
+		map->data.phys_base = map->alloc_data_base;
+		map->data.base = spsi_get_mem_ptr(map->data.phys_base);
+		if (map->data.base == NULL) {
+			SPS_ERR("Cannot get virt addr for I/O buffer: 0x%x",
+				map->data.phys_base);
+			goto exit_err;
+		}
+	}
+
+	/* Attempt to assign this connection to the client */
+	if (sps_rm_assign(pipe, map))
+		goto exit_err;
+
+	/* Initialization was successful */
+	success = true;
+exit_err:
+
+	/* If initialization failed, free resources */
+	if (!success) {
+		sps_rm_free_map_rsrc(map);
+		kfree(map);
+		return NULL;
+	}
+
+	return map;
+}
+
+/**
+ * Free connection mapping
+ *
+ * This function frees a connection mapping.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+static int sps_rm_free(struct sps_pipe *pipe)
+{
+	struct sps_connection *map = (void *)pipe->map;
+	struct sps_connect *cfg = &pipe->connect;
+
+	mutex_lock(&sps_rm->lock);
+
+	/* Free this connection */
+	if (cfg->mode == SPS_MODE_SRC)
+		map->client_src = NULL;
+	else
+		map->client_dest = NULL;
+
+	pipe->map = NULL;
+	pipe->client_state = SPS_STATE_DISCONNECT;
+	sps_rm_free_map_rsrc(map);
+
+	sps_rm_remove_ref(map);
+
+	mutex_unlock(&sps_rm->lock);
+
+	return 0;
+}
+
+/**
+ * Allocate an SPS connection end point
+ *
+ * This function allocates resources and initializes a BAM connection.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+static int sps_rm_alloc(struct sps_pipe *pipe)
+{
+	struct sps_connection *map;
+	int result = SPS_ERROR;
+
+	if (pipe->connect.sps_reserved != SPSRM_CLEAR) {
+		/*
+		 * Client did not call sps_get_config()	to init
+		 * struct sps_connect, so only use legacy members.
+		 */
+		u32 source = pipe->connect.source;
+		u32 destination = pipe->connect.destination;
+		enum sps_mode mode = pipe->connect.mode;
+		u32 config = pipe->connect.config;
+		memset(&pipe->connect, SPSRM_CLEAR,
+			      sizeof(pipe->connect));
+		pipe->connect.source = source;
+		pipe->connect.destination = destination;
+		pipe->connect.mode = mode;
+		pipe->connect.config = config;
+	}
+	if (pipe->connect.config == SPSRM_CLEAR)
+		pipe->connect.config = SPS_CONFIG_DEFAULT;
+
+	/*
+	 *  If configuration is not default, then client is specifying a
+	 * connection mapping.  Find a matching mapping, or fail.
+	 * If a match is found, the client's Connect struct will be updated
+	 * with all the mapping's values.
+	 */
+	if (pipe->connect.config != SPS_CONFIG_DEFAULT) {
+		if (sps_map_find(&pipe->connect)) {
+			SPS_ERR("Failed to find connection mapping");
+			return SPS_ERROR;
+		}
+	}
+
+	mutex_lock(&sps_rm->lock);
+	/* Check client state */
+	if (IS_SPS_STATE_OK(pipe)) {
+		SPS_ERR("Client connection already allocated");
+		goto exit_err;
+	}
+
+	/* Are the connection resources already allocated? */
+	map = find_unconnected(pipe);
+	if (map != NULL) {
+		/* Attempt to assign this connection to the client */
+		if (sps_rm_assign(pipe, map))
+			/* Assignment failed, so must allocate new */
+			map = NULL;
+	}
+
+	/* Allocate a new connection if necessary */
+	if (map == NULL) {
+		map = sps_rm_create(pipe);
+		if (map == NULL) {
+			SPS_ERR("Failed to allocate connection");
+			goto exit_err;
+		}
+		list_add_tail(&map->list, &sps_rm->connections_q);
+	}
+
+	/* Add the connection to the allocated queue */
+	map->refs++;
+
+	/* Initialization was successful */
+	result = 0;
+exit_err:
+	mutex_unlock(&sps_rm->lock);
+
+	if (result)
+		return SPS_ERROR;
+
+	return 0;
+}
+
+/**
+ * Disconnect an SPS connection end point
+ *
+ * This function frees resources and de-initializes a BAM connection.
+ *
+ * @pipe - client context for SPS connection end point
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+static int sps_rm_disconnect(struct sps_pipe *pipe)
+{
+	sps_rm_free(pipe);
+	return 0;
+}
+
+/**
+ * Process connection state change
+ *
+ * This function processes a connection state change.
+ *
+ * @pipe - pointer to client context
+ *
+ * @state - new state for connection
+ *
+ * @return 0 on success, negative value on error
+ *
+ */
+int sps_rm_state_change(struct sps_pipe *pipe, u32 state)
+{
+	int auto_enable = false;
+	int result;
+
+	/* Allocate the pipe */
+	if (pipe->client_state == SPS_STATE_DISCONNECT &&
+	    state == SPS_STATE_ALLOCATE) {
+		if (sps_rm_alloc(pipe))
+			return SPS_ERROR;
+	}
+
+	/* Configure the pipe */
+	if (pipe->client_state == SPS_STATE_ALLOCATE &&
+	    state == SPS_STATE_CONNECT) {
+		/* Connect the BAM pipe */
+		struct sps_bam_connect_param params;
+		memset(&params, 0, sizeof(params));
+		params.mode = pipe->connect.mode;
+		if (pipe->connect.options != SPSRM_CLEAR) {
+			params.options = pipe->connect.options;
+			params.irq_gen_addr = pipe->connect.irq_gen_addr;
+			params.irq_gen_data = pipe->connect.irq_gen_data;
+		}
+		result = sps_bam_pipe_connect(pipe, &params);
+		if (result) {
+			SPS_ERR("Failed to connect BAM 0x%x pipe %d",
+				(u32) pipe->bam, pipe->pipe_index);
+			return SPS_ERROR;
+		}
+		pipe->client_state = SPS_STATE_CONNECT;
+
+		/* Set auto-enable for system-mode connections */
+		if (pipe->connect.source == SPS_DEV_HANDLE_MEM ||
+		    pipe->connect.destination == SPS_DEV_HANDLE_MEM) {
+			if (pipe->map->desc.size != 0 &&
+			    pipe->map->desc.phys_base != SPS_ADDR_INVALID)
+				auto_enable = true;
+		}
+	}
+
+	/* Enable the pipe data flow */
+	if (pipe->client_state == SPS_STATE_CONNECT &&
+	    !(state == SPS_STATE_DISABLE
+	      || state == SPS_STATE_DISCONNECT)
+	    && (state == SPS_STATE_ENABLE || auto_enable
+		|| (pipe->connect.options & SPS_O_AUTO_ENABLE))) {
+		result = sps_bam_pipe_enable(pipe->bam, pipe->pipe_index);
+		if (result) {
+			SPS_ERR("Failed to set BAM 0x%x pipe %d flow on",
+				pipe->bam->props.phys_addr,
+				pipe->pipe_index);
+			return SPS_ERROR;
+		}
+
+		/* Is this a BAM-DMA pipe? */
+#ifdef CONFIG_SPS_SUPPORT_BAMDMA
+		if ((pipe->bam->props.options & SPS_BAM_OPT_BAMDMA)) {
+			/* Activate the BAM-DMA channel */
+			result = sps_dma_pipe_enable(pipe->bam,
+						     pipe->pipe_index);
+			if (result) {
+				SPS_ERR("Failed to activate BAM-DMA pipe: %d",
+					pipe->pipe_index);
+				return SPS_ERROR;
+			}
+		}
+#endif
+		pipe->client_state = SPS_STATE_ENABLE;
+	}
+
+	/* Disable the pipe data flow */
+	if (pipe->client_state == SPS_STATE_ENABLE &&
+	    (state == SPS_STATE_DISABLE	|| state == SPS_STATE_DISCONNECT)) {
+		result = sps_bam_pipe_disable(pipe->bam, pipe->pipe_index);
+		if (result) {
+			SPS_ERR("Failed to set BAM 0x%x pipe %d flow off",
+				pipe->bam->props.phys_addr,
+				pipe->pipe_index);
+			return SPS_ERROR;
+		}
+		pipe->client_state = SPS_STATE_CONNECT;
+	}
+
+	/* Disconnect the BAM pipe */
+	if (pipe->client_state == SPS_STATE_CONNECT &&
+	    state == SPS_STATE_DISCONNECT) {
+		struct sps_connection *map;
+		u32 pipe_index;
+
+		if (pipe->connect.mode == SPS_MODE_SRC)
+			pipe_index = pipe->map->src.pipe_index;
+		else
+			pipe_index = pipe->map->dest.pipe_index;
+
+
+		result = sps_bam_pipe_disconnect(pipe->bam, pipe_index);
+		if (result) {
+			SPS_ERR("Failed to disconnect BAM 0x%x pipe %d",
+				pipe->bam->props.phys_addr,
+				pipe->pipe_index);
+			return SPS_ERROR;
+		}
+
+		/* Clear map state */
+		map = (void *)pipe->map;
+		if (pipe->connect.mode == SPS_MODE_SRC)
+			map->client_src = NULL;
+		else if (pipe->connect.mode == SPS_MODE_DEST)
+			map->client_dest = NULL;
+
+		sps_rm_disconnect(pipe);
+
+		/* Clear the client state */
+		pipe->map = NULL;
+		pipe->bam = NULL;
+		pipe->client_state = SPS_STATE_DISCONNECT;
+	}
+
+	return 0;
+}
-- 
1.7.3.3

Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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