137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
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* Copyright (C) 2012-2017 ARM Limited or its affiliates.
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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 as
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* 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ssi_driver.h"
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#include "ssi_sram_mgr.h"
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/**
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* struct ssi_sram_mgr_ctx -Internal RAM context manager
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* @sram_free_offset: the offset to the non-allocated area
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*/
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struct ssi_sram_mgr_ctx {
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ssi_sram_addr_t sram_free_offset;
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};
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/**
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* ssi_sram_mgr_fini() - Cleanup SRAM pool.
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*
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* @drvdata: Associated device driver context
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*/
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void ssi_sram_mgr_fini(struct ssi_drvdata *drvdata)
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{
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struct ssi_sram_mgr_ctx *smgr_ctx = drvdata->sram_mgr_handle;
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/* Free "this" context */
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if (smgr_ctx) {
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memset(smgr_ctx, 0, sizeof(struct ssi_sram_mgr_ctx));
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kfree(smgr_ctx);
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}
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}
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/**
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* ssi_sram_mgr_init() - Initializes SRAM pool.
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* The pool starts right at the beginning of SRAM.
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* Returns zero for success, negative value otherwise.
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*
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* @drvdata: Associated device driver context
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*/
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int ssi_sram_mgr_init(struct ssi_drvdata *drvdata)
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{
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struct ssi_sram_mgr_ctx *smgr_ctx;
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int rc;
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/* Allocate "this" context */
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drvdata->sram_mgr_handle = kzalloc(
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sizeof(struct ssi_sram_mgr_ctx), GFP_KERNEL);
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if (!drvdata->sram_mgr_handle) {
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SSI_LOG_ERR("Not enough memory to allocate SRAM_MGR ctx (%zu)\n",
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sizeof(struct ssi_sram_mgr_ctx));
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rc = -ENOMEM;
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goto out;
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}
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smgr_ctx = drvdata->sram_mgr_handle;
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/* Pool starts at start of SRAM */
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smgr_ctx->sram_free_offset = 0;
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return 0;
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out:
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ssi_sram_mgr_fini(drvdata);
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return rc;
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}
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/*!
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* Allocated buffer from SRAM pool.
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* Note: Caller is responsible to free the LAST allocated buffer.
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* This function does not taking care of any fragmentation may occur
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* by the order of calls to alloc/free.
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*
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* \param drvdata
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* \param size The requested bytes to allocate
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*/
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ssi_sram_addr_t ssi_sram_mgr_alloc(struct ssi_drvdata *drvdata, u32 size)
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{
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struct ssi_sram_mgr_ctx *smgr_ctx = drvdata->sram_mgr_handle;
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ssi_sram_addr_t p;
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if (unlikely((size & 0x3) != 0)) {
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SSI_LOG_ERR("Requested buffer size (%u) is not multiple of 4",
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size);
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return NULL_SRAM_ADDR;
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}
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if (unlikely(size > (SSI_CC_SRAM_SIZE - smgr_ctx->sram_free_offset))) {
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SSI_LOG_ERR("Not enough space to allocate %u B (at offset %llu)\n",
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size, smgr_ctx->sram_free_offset);
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return NULL_SRAM_ADDR;
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}
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p = smgr_ctx->sram_free_offset;
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smgr_ctx->sram_free_offset += size;
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SSI_LOG_DEBUG("Allocated %u B @ %u\n", size, (unsigned int)p);
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return p;
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}
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/**
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* ssi_sram_mgr_const2sram_desc() - Create const descriptors sequence to
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* set values in given array into SRAM.
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* Note: each const value can't exceed word size.
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*
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* @src: A pointer to array of words to set as consts.
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* @dst: The target SRAM buffer to set into
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* @nelements: The number of words in "src" array
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* @seq: A pointer to the given IN/OUT descriptor sequence
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* @seq_len: A pointer to the given IN/OUT sequence length
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*/
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void ssi_sram_mgr_const2sram_desc(
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const u32 *src, ssi_sram_addr_t dst,
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unsigned int nelement,
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struct cc_hw_desc *seq, unsigned int *seq_len)
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{
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u32 i;
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unsigned int idx = *seq_len;
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for (i = 0; i < nelement; i++, idx++) {
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hw_desc_init(&seq[idx]);
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set_din_const(&seq[idx], src[i], sizeof(u32));
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set_dout_sram(&seq[idx], dst + (i * sizeof(u32)), sizeof(u32));
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set_flow_mode(&seq[idx], BYPASS);
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}
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*seq_len = idx;
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}
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