arch/powerpc/sysdev/ppc4xx_ocm.c - kernel/quantenna - Git at Google

 /*
  * PowerPC 4xx OCM memory allocation support
  *
  * (C) Copyright 2009, Applied Micro Circuits Corporation
  * Victor Gallardo (vgallardo@amcc.com)
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * 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., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 #include <linux/kernel.h>
 #include <linux/dma-mapping.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <asm/rheap.h>
 #include <asm/ppc4xx_ocm.h>
 #include <linux/slab.h>
 #include <linux/debugfs.h>

 #define OCM_DISABLED	0
 #define OCM_ENABLED		1

 struct ocm_block {
 	struct list_head	list;
 	void __iomem		*addr;
 	int					size;
 	const char			*owner;
 };

 /* non-cached or cached region */
 struct ocm_region {
 	phys_addr_t			phys;
 	void __iomem		*virt;

 	int					memtotal;
 	int					memfree;

 	rh_info_t			*rh;
 	struct list_head	list;
 };

 struct ocm_info {
 	int					index;
 	int					status;
 	int					ready;

 	phys_addr_t			phys;

 	int					alignment;
 	int					memtotal;
 	int					cache_size;

 	struct ocm_region	nc;	/* non-cached region */
 	struct ocm_region	c;	/* cached region */
 };

 static struct ocm_info *ocm_nodes;
 static int ocm_count;

 static struct ocm_info *ocm_get_node(unsigned int index)
 {
 	if (index >= ocm_count) {
 		printk(KERN_ERR "PPC4XX OCM: invalid index");
 		return NULL;
 	}

 	return &ocm_nodes[index];
 }

 static int ocm_free_region(struct ocm_region *ocm_reg, const void *addr)
 {
 	struct ocm_block *blk, *tmp;
 	unsigned long offset;

 	if (!ocm_reg->virt)
 		return 0;

 	list_for_each_entry_safe(blk, tmp, &ocm_reg->list, list) {
 		if (blk->addr == addr) {
 			offset = addr - ocm_reg->virt;
 			ocm_reg->memfree += blk->size;
 			rh_free(ocm_reg->rh, offset);
 			list_del(&blk->list);
 			kfree(blk);
 			return 1;
 		}
 	}

 	return 0;
 }

 static void __init ocm_init_node(int count, struct device_node *node)
 {
 	struct ocm_info *ocm;

 	const unsigned int *cell_index;
 	const unsigned int *cache_size;
 	int len;

 	struct resource rsrc;
 	int ioflags;

 	ocm = ocm_get_node(count);

 	cell_index = of_get_property(node, "cell-index", &len);
 	if (!cell_index) {
 		printk(KERN_ERR "PPC4XX OCM: missing cell-index property");
 		return;
 	}
 	ocm->index = *cell_index;

 	if (of_device_is_available(node))
 		ocm->status = OCM_ENABLED;

 	cache_size = of_get_property(node, "cached-region-size", &len);
 	if (cache_size)
 		ocm->cache_size = *cache_size;

 	if (of_address_to_resource(node, 0, &rsrc)) {
 		printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n",
 			ocm->index);
 		return;
 	}

 	ocm->phys = rsrc.start;
 	ocm->memtotal = (rsrc.end - rsrc.start + 1);

 	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n",
 		ocm->index, ocm->memtotal,
 		(ocm->status == OCM_DISABLED) ? "disabled" : "enabled");

 	if (ocm->status == OCM_DISABLED)
 		return;

 	/* request region */

 	if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) {
 		printk(KERN_ERR "PPC4XX OCM%d: could not request region\n",
 			ocm->index);
 		return;
 	}

 	/* Configure non-cached and cached regions */

 	ocm->nc.phys = ocm->phys;
 	ocm->nc.memtotal = ocm->memtotal - ocm->cache_size;
 	ocm->nc.memfree = ocm->nc.memtotal;

 	ocm->c.phys = ocm->phys + ocm->nc.memtotal;
 	ocm->c.memtotal = ocm->cache_size;
 	ocm->c.memfree = ocm->c.memtotal;

 	if (ocm->nc.memtotal == 0)
 		ocm->nc.phys = 0;

 	if (ocm->c.memtotal == 0)
 		ocm->c.phys = 0;

 	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n",
 		ocm->index, ocm->nc.memtotal);

 	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n",
 		ocm->index, ocm->c.memtotal);

 	/* ioremap the non-cached region */
 	if (ocm->nc.memtotal) {
 		ioflags = _PAGE_NO_CACHE | _PAGE_GUARDED | _PAGE_EXEC;
 		ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
 					  ioflags);

 		if (!ocm->nc.virt) {
 			printk(KERN_ERR
 			       "PPC4XX OCM%d: failed to ioremap non-cached memory\n",
 			       ocm->index);
 			ocm->nc.memfree = 0;
 			return;
 		}
 	}

 	/* ioremap the cached region */

 	if (ocm->c.memtotal) {
 		ioflags = _PAGE_EXEC;
 		ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
 					 ioflags);

 		if (!ocm->c.virt) {
 			printk(KERN_ERR
 			       "PPC4XX OCM%d: failed to ioremap cached memory\n",
 			       ocm->index);
 			ocm->c.memfree = 0;
 			return;
 		}
 	}

 	/* Create Remote Heaps */

 	ocm->alignment = 4; /* default 4 byte alignment */

 	if (ocm->nc.virt) {
 		ocm->nc.rh = rh_create(ocm->alignment);
 		rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal);
 	}

 	if (ocm->c.virt) {
 		ocm->c.rh = rh_create(ocm->alignment);
 		rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal);
 	}

 	INIT_LIST_HEAD(&ocm->nc.list);
 	INIT_LIST_HEAD(&ocm->c.list);

 	ocm->ready = 1;

 	return;
 }

 static int ocm_debugfs_show(struct seq_file *m, void *v)
 {
 	struct ocm_block *blk, *tmp;
 	unsigned int i;

 	for (i = 0; i < ocm_count; i++) {
 		struct ocm_info *ocm = ocm_get_node(i);

 		if (!ocm || !ocm->ready)
 			continue;

 		seq_printf(m, "PPC4XX OCM   : %d\n", ocm->index);
 		seq_printf(m, "PhysAddr     : 0x%llx\n", ocm->phys);
 		seq_printf(m, "MemTotal     : %d Bytes\n", ocm->memtotal);
 		seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal);
 		seq_printf(m, "MemTotal(C)  : %d Bytes\n", ocm->c.memtotal);

 		seq_printf(m, "\n");

 		seq_printf(m, "NC.PhysAddr  : 0x%llx\n", ocm->nc.phys);
 		seq_printf(m, "NC.VirtAddr  : 0x%p\n", ocm->nc.virt);
 		seq_printf(m, "NC.MemTotal  : %d Bytes\n", ocm->nc.memtotal);
 		seq_printf(m, "NC.MemFree   : %d Bytes\n", ocm->nc.memfree);

 		list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) {
 			seq_printf(m, "NC.MemUsed   : %d Bytes (%s)\n",
 							blk->size, blk->owner);
 		}

 		seq_printf(m, "\n");

 		seq_printf(m, "C.PhysAddr   : 0x%llx\n", ocm->c.phys);
 		seq_printf(m, "C.VirtAddr   : 0x%p\n", ocm->c.virt);
 		seq_printf(m, "C.MemTotal   : %d Bytes\n", ocm->c.memtotal);
 		seq_printf(m, "C.MemFree    : %d Bytes\n", ocm->c.memfree);

 		list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) {
 			seq_printf(m, "C.MemUsed    : %d Bytes (%s)\n",
 						blk->size, blk->owner);
 		}

 		seq_printf(m, "\n");
 	}

 	return 0;
 }

 static int ocm_debugfs_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, ocm_debugfs_show, NULL);
 }

 static const struct file_operations ocm_debugfs_fops = {
 	.open = ocm_debugfs_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 };

 static int ocm_debugfs_init(void)
 {
 	struct dentry *junk;

 	junk = debugfs_create_dir("ppc4xx_ocm", 0);
 	if (!junk) {
 		printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
 		return -1;
 	}

 	if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
 		printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
 		return -1;
 	}

 	return 0;
 }

 void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align,
 			int flags, const char *owner)
 {
 	void __iomem *addr = NULL;
 	unsigned long offset;
 	struct ocm_info *ocm;
 	struct ocm_region *ocm_reg;
 	struct ocm_block *ocm_blk;
 	int i;

 	for (i = 0; i < ocm_count; i++) {
 		ocm = ocm_get_node(i);

 		if (!ocm || !ocm->ready)
 			continue;

 		if (flags == PPC4XX_OCM_NON_CACHED)
 			ocm_reg = &ocm->nc;
 		else
 			ocm_reg = &ocm->c;

 		if (!ocm_reg->virt)
 			continue;

 		if (align < ocm->alignment)
 			align = ocm->alignment;

 		offset = rh_alloc_align(ocm_reg->rh, size, align, NULL);

 		if (IS_ERR_VALUE(offset))
 			continue;

 		ocm_blk = kzalloc(sizeof(struct ocm_block), GFP_KERNEL);
 		if (!ocm_blk) {
 			printk(KERN_ERR "PPC4XX OCM: could not allocate ocm block");
 			rh_free(ocm_reg->rh, offset);
 			break;
 		}

 		*phys = ocm_reg->phys + offset;
 		addr = ocm_reg->virt + offset;
 		size = ALIGN(size, align);

 		ocm_blk->addr = addr;
 		ocm_blk->size = size;
 		ocm_blk->owner = owner;
 		list_add_tail(&ocm_blk->list, &ocm_reg->list);

 		ocm_reg->memfree -= size;

 		break;
 	}

 	return addr;
 }

 void ppc4xx_ocm_free(const void *addr)
 {
 	int i;

 	if (!addr)
 		return;

 	for (i = 0; i < ocm_count; i++) {
 		struct ocm_info *ocm = ocm_get_node(i);

 		if (!ocm || !ocm->ready)
 			continue;

 		if (ocm_free_region(&ocm->nc, addr) ||
 			ocm_free_region(&ocm->c, addr))
 			return;
 	}
 }

 static int __init ppc4xx_ocm_init(void)
 {
 	struct device_node *np;
 	int count;

 	count = 0;
 	for_each_compatible_node(np, NULL, "ibm,ocm")
 		count++;

 	if (!count)
 		return 0;

 	ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL);
 	if (!ocm_nodes) {
 		printk(KERN_ERR "PPC4XX OCM: failed to allocate OCM nodes!\n");
 		return -ENOMEM;
 	}

 	ocm_count = count;
 	count = 0;

 	for_each_compatible_node(np, NULL, "ibm,ocm") {
 		ocm_init_node(count, np);
 		count++;
 	}

 	ocm_debugfs_init();

 	return 0;
 }

 arch_initcall(ppc4xx_ocm_init);
	/*
	* PowerPC 4xx OCM memory allocation support
	*
	* (C) Copyright 2009, Applied Micro Circuits Corporation
	* Victor Gallardo (vgallardo@amcc.com)
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* 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., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	#include <linux/kernel.h>
	#include <linux/dma-mapping.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <asm/rheap.h>
	#include <asm/ppc4xx_ocm.h>
	#include <linux/slab.h>
	#include <linux/debugfs.h>

	#define OCM_DISABLED 0
	#define OCM_ENABLED 1

	struct ocm_block {
	struct list_head list;
	void __iomem *addr;
	int size;
	const char *owner;
	};

	/* non-cached or cached region */
	struct ocm_region {
	phys_addr_t phys;
	void __iomem *virt;

	int memtotal;
	int memfree;

	rh_info_t *rh;
	struct list_head list;
	};

	struct ocm_info {
	int index;
	int status;
	int ready;

	phys_addr_t phys;

	int alignment;
	int memtotal;
	int cache_size;

	struct ocm_region nc; /* non-cached region */
	struct ocm_region c; /* cached region */
	};

	static struct ocm_info *ocm_nodes;
	static int ocm_count;

	static struct ocm_info *ocm_get_node(unsigned int index)
	{
	if (index >= ocm_count) {
	printk(KERN_ERR "PPC4XX OCM: invalid index");
	return NULL;
	}

	return &ocm_nodes[index];
	}

	static int ocm_free_region(struct ocm_region ocm_reg, const void addr)
	{
	struct ocm_block blk, tmp;
	unsigned long offset;

	if (!ocm_reg->virt)
	return 0;

	list_for_each_entry_safe(blk, tmp, &ocm_reg->list, list) {
	if (blk->addr == addr) {
	offset = addr - ocm_reg->virt;
	ocm_reg->memfree += blk->size;
	rh_free(ocm_reg->rh, offset);
	list_del(&blk->list);
	kfree(blk);
	return 1;
	}
	}

	return 0;
	}

	static void __init ocm_init_node(int count, struct device_node *node)
	{
	struct ocm_info *ocm;

	const unsigned int *cell_index;
	const unsigned int *cache_size;
	int len;

	struct resource rsrc;
	int ioflags;

	ocm = ocm_get_node(count);

	cell_index = of_get_property(node, "cell-index", &len);
	if (!cell_index) {
	printk(KERN_ERR "PPC4XX OCM: missing cell-index property");
	return;
	}
	ocm->index = *cell_index;

	if (of_device_is_available(node))
	ocm->status = OCM_ENABLED;

	cache_size = of_get_property(node, "cached-region-size", &len);
	if (cache_size)
	ocm->cache_size = *cache_size;

	if (of_address_to_resource(node, 0, &rsrc)) {
	printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n",
	ocm->index);
	return;
	}

	ocm->phys = rsrc.start;
	ocm->memtotal = (rsrc.end - rsrc.start + 1);

	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n",
	ocm->index, ocm->memtotal,
	(ocm->status == OCM_DISABLED) ? "disabled" : "enabled");

	if (ocm->status == OCM_DISABLED)
	return;

	/* request region */

	if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) {
	printk(KERN_ERR "PPC4XX OCM%d: could not request region\n",
	ocm->index);
	return;
	}

	/* Configure non-cached and cached regions */

	ocm->nc.phys = ocm->phys;
	ocm->nc.memtotal = ocm->memtotal - ocm->cache_size;
	ocm->nc.memfree = ocm->nc.memtotal;

	ocm->c.phys = ocm->phys + ocm->nc.memtotal;
	ocm->c.memtotal = ocm->cache_size;
	ocm->c.memfree = ocm->c.memtotal;

	if (ocm->nc.memtotal == 0)
	ocm->nc.phys = 0;

	if (ocm->c.memtotal == 0)
	ocm->c.phys = 0;

	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n",
	ocm->index, ocm->nc.memtotal);

	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n",
	ocm->index, ocm->c.memtotal);

	/* ioremap the non-cached region */
	if (ocm->nc.memtotal) {
	ioflags = _PAGE_NO_CACHE \| _PAGE_GUARDED \| _PAGE_EXEC;
	ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
	ioflags);

	if (!ocm->nc.virt) {
	printk(KERN_ERR
	"PPC4XX OCM%d: failed to ioremap non-cached memory\n",
	ocm->index);
	ocm->nc.memfree = 0;
	return;
	}
	}

	/* ioremap the cached region */

	if (ocm->c.memtotal) {
	ioflags = _PAGE_EXEC;
	ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
	ioflags);

	if (!ocm->c.virt) {
	printk(KERN_ERR
	"PPC4XX OCM%d: failed to ioremap cached memory\n",
	ocm->index);
	ocm->c.memfree = 0;
	return;
	}
	}

	/* Create Remote Heaps */

	ocm->alignment = 4; /* default 4 byte alignment */

	if (ocm->nc.virt) {
	ocm->nc.rh = rh_create(ocm->alignment);
	rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal);
	}

	if (ocm->c.virt) {
	ocm->c.rh = rh_create(ocm->alignment);
	rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal);
	}

	INIT_LIST_HEAD(&ocm->nc.list);
	INIT_LIST_HEAD(&ocm->c.list);

	ocm->ready = 1;

	return;
	}

	static int ocm_debugfs_show(struct seq_file m, void v)
	{
	struct ocm_block blk, tmp;
	unsigned int i;

	for (i = 0; i < ocm_count; i++) {
	struct ocm_info *ocm = ocm_get_node(i);

	if (!ocm \|\| !ocm->ready)
	continue;

	seq_printf(m, "PPC4XX OCM : %d\n", ocm->index);
	seq_printf(m, "PhysAddr : 0x%llx\n", ocm->phys);
	seq_printf(m, "MemTotal : %d Bytes\n", ocm->memtotal);
	seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal);
	seq_printf(m, "MemTotal(C) : %d Bytes\n", ocm->c.memtotal);

	seq_printf(m, "\n");

	seq_printf(m, "NC.PhysAddr : 0x%llx\n", ocm->nc.phys);
	seq_printf(m, "NC.VirtAddr : 0x%p\n", ocm->nc.virt);
	seq_printf(m, "NC.MemTotal : %d Bytes\n", ocm->nc.memtotal);
	seq_printf(m, "NC.MemFree : %d Bytes\n", ocm->nc.memfree);

	list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) {
	seq_printf(m, "NC.MemUsed : %d Bytes (%s)\n",
	blk->size, blk->owner);
	}

	seq_printf(m, "\n");

	seq_printf(m, "C.PhysAddr : 0x%llx\n", ocm->c.phys);
	seq_printf(m, "C.VirtAddr : 0x%p\n", ocm->c.virt);
	seq_printf(m, "C.MemTotal : %d Bytes\n", ocm->c.memtotal);
	seq_printf(m, "C.MemFree : %d Bytes\n", ocm->c.memfree);

	list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) {
	seq_printf(m, "C.MemUsed : %d Bytes (%s)\n",
	blk->size, blk->owner);
	}

	seq_printf(m, "\n");
	}

	return 0;
	}

	static int ocm_debugfs_open(struct inode inode, struct file file)
	{
	return single_open(file, ocm_debugfs_show, NULL);
	}

	static const struct file_operations ocm_debugfs_fops = {
	.open = ocm_debugfs_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static int ocm_debugfs_init(void)
	{
	struct dentry *junk;

	junk = debugfs_create_dir("ppc4xx_ocm", 0);
	if (!junk) {
	printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
	return -1;
	}

	if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
	printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
	return -1;
	}

	return 0;
	}

	void ppc4xx_ocm_alloc(phys_addr_t phys, int size, int align,
	int flags, const char *owner)
	{
	void __iomem *addr = NULL;
	unsigned long offset;
	struct ocm_info *ocm;
	struct ocm_region *ocm_reg;
	struct ocm_block *ocm_blk;
	int i;

	for (i = 0; i < ocm_count; i++) {
	ocm = ocm_get_node(i);

	if (!ocm \|\| !ocm->ready)
	continue;

	if (flags == PPC4XX_OCM_NON_CACHED)
	ocm_reg = &ocm->nc;
	else
	ocm_reg = &ocm->c;

	if (!ocm_reg->virt)
	continue;

	if (align < ocm->alignment)
	align = ocm->alignment;

	offset = rh_alloc_align(ocm_reg->rh, size, align, NULL);

	if (IS_ERR_VALUE(offset))
	continue;

	ocm_blk = kzalloc(sizeof(struct ocm_block), GFP_KERNEL);
	if (!ocm_blk) {
	printk(KERN_ERR "PPC4XX OCM: could not allocate ocm block");
	rh_free(ocm_reg->rh, offset);
	break;
	}

	*phys = ocm_reg->phys + offset;
	addr = ocm_reg->virt + offset;
	size = ALIGN(size, align);

	ocm_blk->addr = addr;
	ocm_blk->size = size;
	ocm_blk->owner = owner;
	list_add_tail(&ocm_blk->list, &ocm_reg->list);

	ocm_reg->memfree -= size;

	break;
	}

	return addr;
	}

	void ppc4xx_ocm_free(const void *addr)
	{
	int i;

	if (!addr)
	return;

	for (i = 0; i < ocm_count; i++) {
	struct ocm_info *ocm = ocm_get_node(i);

	if (!ocm \|\| !ocm->ready)
	continue;

	if (ocm_free_region(&ocm->nc, addr) \|\|
	ocm_free_region(&ocm->c, addr))
	return;
	}
	}

	static int __init ppc4xx_ocm_init(void)
	{
	struct device_node *np;
	int count;

	count = 0;
	for_each_compatible_node(np, NULL, "ibm,ocm")
	count++;

	if (!count)
	return 0;

	ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL);
	if (!ocm_nodes) {
	printk(KERN_ERR "PPC4XX OCM: failed to allocate OCM nodes!\n");
	return -ENOMEM;
	}

	ocm_count = count;
	count = 0;

	for_each_compatible_node(np, NULL, "ibm,ocm") {
	ocm_init_node(count, np);
	count++;
	}

	ocm_debugfs_init();

	return 0;
	}

	arch_initcall(ppc4xx_ocm_init);