/*
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* Copyright 2008-2015 Freescale Semiconductor Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Freescale Semiconductor nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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*
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* ALTERNATIVELY, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") as published by the Free Software
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* Foundation, either version 2 of that License or (at your option) any
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* later version.
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*
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* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "fman_muram.h"
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/genalloc.h>
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struct muram_info {
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struct gen_pool *pool;
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void __iomem *vbase;
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size_t size;
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phys_addr_t pbase;
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};
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static unsigned long fman_muram_vbase_to_offset(struct muram_info *muram,
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unsigned long vaddr)
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{
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return vaddr - (unsigned long)muram->vbase;
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}
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/**
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* fman_muram_init
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* @base: Pointer to base of memory mapped FM-MURAM.
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* @size: Size of the FM-MURAM partition.
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*
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* Creates partition in the MURAM.
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* The routine returns a pointer to the MURAM partition.
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* This pointer must be passed as to all other FM-MURAM function calls.
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* No actual initialization or configuration of FM_MURAM hardware is done by
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* this routine.
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*
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* Return: pointer to FM-MURAM object, or NULL for Failure.
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*/
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struct muram_info *fman_muram_init(phys_addr_t base, size_t size)
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{
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struct muram_info *muram;
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void __iomem *vaddr;
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int ret;
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muram = kzalloc(sizeof(*muram), GFP_KERNEL);
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if (!muram)
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return NULL;
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muram->pool = gen_pool_create(ilog2(64), -1);
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if (!muram->pool) {
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pr_err("%s(): MURAM pool create failed\n", __func__);
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goto muram_free;
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}
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vaddr = ioremap(base, size);
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if (!vaddr) {
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pr_err("%s(): MURAM ioremap failed\n", __func__);
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goto pool_destroy;
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}
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ret = gen_pool_add_virt(muram->pool, (unsigned long)vaddr,
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base, size, -1);
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if (ret < 0) {
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pr_err("%s(): MURAM pool add failed\n", __func__);
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iounmap(vaddr);
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goto pool_destroy;
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}
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memset_io(vaddr, 0, (int)size);
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muram->vbase = vaddr;
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muram->pbase = base;
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return muram;
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pool_destroy:
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gen_pool_destroy(muram->pool);
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muram_free:
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kfree(muram);
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return NULL;
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}
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/**
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* fman_muram_offset_to_vbase
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* @muram: FM-MURAM module pointer.
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* @offset: the offset of the memory block
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*
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* Gives the address of the memory region from specific offset
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*
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* Return: The address of the memory block
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*/
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unsigned long fman_muram_offset_to_vbase(struct muram_info *muram,
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unsigned long offset)
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{
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return offset + (unsigned long)muram->vbase;
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}
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/**
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* fman_muram_alloc
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* @muram: FM-MURAM module pointer.
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* @size: Size of the memory to be allocated.
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*
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* Allocate some memory from FM-MURAM partition.
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*
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* Return: address of the allocated memory; NULL otherwise.
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*/
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unsigned long fman_muram_alloc(struct muram_info *muram, size_t size)
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{
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unsigned long vaddr;
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vaddr = gen_pool_alloc(muram->pool, size);
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if (!vaddr)
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return -ENOMEM;
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memset_io((void __iomem *)vaddr, 0, size);
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return fman_muram_vbase_to_offset(muram, vaddr);
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}
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/**
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* fman_muram_free_mem
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* @muram: FM-MURAM module pointer.
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* @offset: offset of the memory region to be freed.
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* @size: size of the memory to be freed.
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*
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* Free an allocated memory from FM-MURAM partition.
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*/
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void fman_muram_free_mem(struct muram_info *muram, unsigned long offset,
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size_t size)
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{
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unsigned long addr = fman_muram_offset_to_vbase(muram, offset);
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gen_pool_free(muram->pool, addr, size);
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}
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