Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * debugfs ops for the L1 cache

 *

 *  Copyright (C) 2006  Paul Mundt

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#include <linux/init.h>

#include <linux/module.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <asm/processor.h>

#include <asm/uaccess.h>

#include <asm/cache.h>

#include <asm/io.h>

enum cache_type {

        CACHE_TYPE_ICACHE,

        CACHE_TYPE_DCACHE,

        CACHE_TYPE_UNIFIED,

};

static int cache_seq_show(struct seq_file *file, void *iter)

{

        unsigned int cache_type = (unsigned int)file->private;

        struct cache_info *cache;

        unsigned int waysize, way, cache_size;

        unsigned long ccr, base;

        static unsigned long addrstart = 0;

        /*

         * Go uncached immediately so we don't skew the results any

         * more than we already are..

         */

        jump_to_P2();

        ccr = ctrl_inl(CCR);

        if ((ccr & CCR_CACHE_ENABLE) == 0) {

                back_to_P1();

                seq_printf(file, "disabled\n");

                return 0;

        }

        if (cache_type == CACHE_TYPE_DCACHE) {

                base = CACHE_OC_ADDRESS_ARRAY;

                cache = &current_cpu_data.dcache;

        } else {

                base = CACHE_IC_ADDRESS_ARRAY;

                cache = &current_cpu_data.icache;

        }

        /*

         * Due to the amount of data written out (depending on the cache size),

         * we may be iterated over multiple times. In this case, keep track of

         * the entry position in addrstart, and rewind it when we've hit the

         * end of the cache.

         *

         * Likewise, the same code is used for multiple caches, so care must

         * be taken for bouncing addrstart back and forth so the appropriate

         * cache is hit.

         */

        cache_size = cache->ways * cache->sets * cache->linesz;

        if (((addrstart & 0xff000000) != base) ||

             (addrstart & 0x00ffffff) > cache_size)

                addrstart = base;

        waysize = cache->sets;

        /*

         * If the OC is already in RAM mode, we only have

         * half of the entries to consider..

         */

        if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)

                waysize >>= 1;

        waysize <<= cache->entry_shift;

        for (way = 0; way < cache->ways; way++) {

                unsigned long addr;

                unsigned int line;

                seq_printf(file, "-----------------------------------------\n");

                seq_printf(file, "Way %d\n", way);

                seq_printf(file, "-----------------------------------------\n");

                for (addr = addrstart, line = 0;

                     addr < addrstart + waysize;

                     addr += cache->linesz, line++) {

                        unsigned long data = ctrl_inl(addr);

                        /* Check the V bit, ignore invalid cachelines */

                        if ((data & 1) == 0)

                                continue;

                        /* U: Dirty, cache tag is 10 bits up */

                        seq_printf(file, "%3d: %c 0x%lx\n",

                                   line, data & 2 ? 'U' : ' ',

                                   data & 0x1ffffc00);

                }

                addrstart += cache->way_incr;

        }

        back_to_P1();

        return 0;

}

static int cache_debugfs_open(struct inode *inode, struct file *file)

{

        return single_open(file, cache_seq_show, inode->i_private);

}

static const struct file_operations cache_debugfs_fops = {

        .owner          = THIS_MODULE,

        .open           = cache_debugfs_open,

        .read           = seq_read,

        .llseek         = seq_lseek,

        .release        = seq_release,

};

static int __init cache_debugfs_init(void)

{

        struct dentry *dcache_dentry, *icache_dentry;

        dcache_dentry = debugfs_create_file("dcache", S_IRUSR, NULL,

                                            (unsigned int *)CACHE_TYPE_DCACHE,

                                            &cache_debugfs_fops);

        if (IS_ERR(dcache_dentry))

                return PTR_ERR(dcache_dentry);

        icache_dentry = debugfs_create_file("icache", S_IRUSR, NULL,

                                            (unsigned int *)CACHE_TYPE_ICACHE,

                                            &cache_debugfs_fops);

        if (IS_ERR(icache_dentry)) {

                debugfs_remove(dcache_dentry);

                return PTR_ERR(icache_dentry);

        }

        return 0;

}

module_init(cache_debugfs_init);

MODULE_LICENSE("GPL v2");