Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | /*
* 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, "%s: request memory failed\n",
dev->dev.of_node->full_name);
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, "%s: ioremap_prot failed\n",
dev->dev.of_node->full_name);
ret = -ENOMEM;
goto out_release;
}
cache_sram->rh = rh_create(sizeof(unsigned int));
if (IS_ERR(cache_sram->rh)) {
dev_err(&dev->dev, "%s: Unable to create remote heap\n",
dev->dev.of_node->full_name);
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");
}
|