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/*
* Copyright 2009-2010 Freescale Semiconductor, Inc.
*
* Simple memory allocator abstraction for QorIQ (P1/P2) based Cache-SRAM
*
* Author: Vivek Mahajan <vivek.mahajan@freescale.com>
*
* This file is derived from the original work done
* by Sylvain Munaut for the Bestcomm SRAM allocator.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of_platform.h>
#include <asm/pgtable.h>
#include <asm/fsl_85xx_cache_sram.h>
#include "fsl_85xx_cache_ctlr.h"
struct mpc85xx_cache_sram *cache_sram;
void *mpc85xx_cache_sram_alloc(unsigned int size,
phys_addr_t *phys, unsigned int align)
{
unsigned long offset;
unsigned long flags;
if (unlikely(cache_sram == NULL))
return NULL;
if (!size || (size > cache_sram->size) || (align > cache_sram->size)) {
pr_err("%s(): size(=%x) or align(=%x) zero or too big\n",
__func__, size, align);
return NULL;
}
if ((align & (align - 1)) || align <= 1) {
pr_err("%s(): align(=%x) must be power of two and >1\n",
__func__, align);
return NULL;
}
spin_lock_irqsave(&cache_sram->lock, flags);
offset = rh_alloc_align(cache_sram->rh, size, align, NULL);
spin_unlock_irqrestore(&cache_sram->lock, flags);
if (IS_ERR_VALUE(offset))
return NULL;
*phys = cache_sram->base_phys + offset;
return (unsigned char *)cache_sram->base_virt + offset;
}
EXPORT_SYMBOL(mpc85xx_cache_sram_alloc);
void mpc85xx_cache_sram_free(void *ptr)
{
unsigned long flags;
BUG_ON(!ptr);
spin_lock_irqsave(&cache_sram->lock, flags);
rh_free(cache_sram->rh, ptr - cache_sram->base_virt);
spin_unlock_irqrestore(&cache_sram->lock, flags);
}
EXPORT_SYMBOL(mpc85xx_cache_sram_free);
int __init instantiate_cache_sram(struct platform_device *dev,
struct sram_parameters sram_params)
{
int ret = 0;
if (cache_sram) {
dev_err(&dev->dev, "Already initialized cache-sram\n");
return -EBUSY;
}
cache_sram = kzalloc(sizeof(struct mpc85xx_cache_sram), GFP_KERNEL);
if (!cache_sram) {
dev_err(&dev->dev, "Out of memory for cache_sram structure\n");
return -ENOMEM;
}
cache_sram->base_phys = sram_params.sram_offset;
cache_sram->size = sram_params.sram_size;
if (!request_mem_region(cache_sram->base_phys, cache_sram->size,
"fsl_85xx_cache_sram")) {
dev_err(&dev->dev, "%pOF: request memory failed\n",
dev->dev.of_node);
ret = -ENXIO;
goto out_free;
}
cache_sram->base_virt = ioremap_prot(cache_sram->base_phys,
cache_sram->size, _PAGE_COHERENT | PAGE_KERNEL);
if (!cache_sram->base_virt) {
dev_err(&dev->dev, "%pOF: ioremap_prot failed\n",
dev->dev.of_node);
ret = -ENOMEM;
goto out_release;
}
cache_sram->rh = rh_create(sizeof(unsigned int));
if (IS_ERR(cache_sram->rh)) {
dev_err(&dev->dev, "%pOF: Unable to create remote heap\n",
dev->dev.of_node);
ret = PTR_ERR(cache_sram->rh);
goto out_unmap;
}
rh_attach_region(cache_sram->rh, 0, cache_sram->size);
spin_lock_init(&cache_sram->lock);
dev_info(&dev->dev, "[base:0x%llx, size:0x%x] configured and loaded\n",
(unsigned long long)cache_sram->base_phys, cache_sram->size);
return 0;
out_unmap:
iounmap(cache_sram->base_virt);
out_release:
release_mem_region(cache_sram->base_phys, cache_sram->size);
out_free:
kfree(cache_sram);
return ret;
}
void remove_cache_sram(struct platform_device *dev)
{
BUG_ON(!cache_sram);
rh_detach_region(cache_sram->rh, 0, cache_sram->size);
rh_destroy(cache_sram->rh);
iounmap(cache_sram->base_virt);
release_mem_region(cache_sram->base_phys, cache_sram->size);
kfree(cache_sram);
cache_sram = NULL;
dev_info(&dev->dev, "MPC85xx Cache-SRAM driver unloaded\n");
}
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