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