138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
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/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/**
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* Connection mapping table managment for SPS device driver.
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*/
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#include <linux/types.h> /* u32 */
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#include <linux/kernel.h> /* pr_info() */
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#include <linux/memory.h> /* memset */
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#include "spsi.h"
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/* Module state */
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struct sps_map_state {
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const struct sps_map *maps;
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u32 num_maps;
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u32 options;
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};
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static struct sps_map_state sps_maps;
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/**
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* Initialize connection mapping module
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*
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*/
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int sps_map_init(const struct sps_map *map_props, u32 options)
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{
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const struct sps_map *maps;
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/* Are there any connection mappings? */
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memset(&sps_maps, 0, sizeof(sps_maps));
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if (map_props == NULL)
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return 0;
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/* Init the module state */
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sps_maps.maps = map_props;
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sps_maps.options = options;
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for (maps = sps_maps.maps;; maps++, sps_maps.num_maps++)
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if (maps->src.periph_class == SPS_CLASS_INVALID &&
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maps->src.periph_phy_addr == SPS_ADDR_INVALID)
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break;
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SPS_DBG("sps: %d mappings", sps_maps.num_maps);
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return 0;
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}
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/**
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* De-initialize connection mapping module
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*
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*/
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void sps_map_de_init(void)
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{
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memset(&sps_maps, 0, sizeof(sps_maps));
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}
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/**
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* Find matching connection mapping
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*
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*/
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int sps_map_find(struct sps_connect *connect)
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{
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const struct sps_map *map;
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u32 i;
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void *desc;
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void *data;
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/* Are there any connection mappings? */
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if (sps_maps.num_maps == 0)
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return SPS_ERROR;
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/* Search the mapping table for a match to the specified connection */
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for (i = sps_maps.num_maps, map = sps_maps.maps;
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i > 0; i--, map++)
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if (map->src.periph_class == (u32) connect->source &&
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map->dest.periph_class == (u32) connect->destination
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&& map->config == (u32) connect->config)
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break;
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if (i == 0)
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return SPS_ERROR;
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/*
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* Before modifying client parameter struct, perform all
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* operations that might fail
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*/
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desc = spsi_get_mem_ptr(map->desc_base);
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if (desc == NULL) {
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SPS_ERR("sps:Cannot get virt addr for I/O buffer: 0x%x",
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map->desc_base);
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return SPS_ERROR;
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}
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if (map->data_size > 0 && map->data_base != SPS_ADDR_INVALID) {
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data = spsi_get_mem_ptr(map->data_base);
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if (data == NULL) {
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SPS_ERR("sps:Can't get virt addr for I/O buffer: 0x%x",
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map->data_base);
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return SPS_ERROR;
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}
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} else {
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data = NULL;
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}
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/* Copy mapping values to client parameter struct */
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if (connect->source != SPS_DEV_HANDLE_MEM)
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connect->src_pipe_index = map->src.pipe_index;
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if (connect->destination != SPS_DEV_HANDLE_MEM)
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connect->dest_pipe_index = map->dest.pipe_index;
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if (connect->mode == SPS_MODE_SRC)
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connect->event_thresh = map->src.event_thresh;
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else
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connect->event_thresh = map->dest.event_thresh;
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connect->desc.size = map->desc_size;
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connect->desc.phys_base = map->desc_base;
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connect->desc.base = desc;
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if (map->data_size > 0 && map->data_base != SPS_ADDR_INVALID) {
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connect->data.size = map->data_size;
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connect->data.phys_base = map->data_base;
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connect->data.base = data;
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}
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return 0;
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}
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