[linux-2.6-block.git] / arch / powerpc / sysdev / ppc4xx_ocm.c

/*
 * 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);
Commit	Line	Data
c19d8248 VNHT	1	/*
	2	* PowerPC 4xx OCM memory allocation support
	3	*
	4	* (C) Copyright 2009, Applied Micro Circuits Corporation
	5	* Victor Gallardo (vgallardo@amcc.com)
	6	*
	7	* See file CREDITS for list of people who contributed to this
	8	* project.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of
	13	* the License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	23	* MA 02111-1307 USA
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/dma-mapping.h>
	28	#include <linux/of.h>
c11eede6	29	#include <linux/of_address.h>
c19d8248 VNHT	30	#include <asm/rheap.h>
	31	#include <asm/ppc4xx_ocm.h>
	32	#include <linux/slab.h>
	33	#include <linux/debugfs.h>
	34
	35	#define OCM_DISABLED 0
	36	#define OCM_ENABLED 1
	37
	38	struct ocm_block {
	39	struct list_head list;
	40	void __iomem *addr;
	41	int size;
	42	const char *owner;
	43	};
	44
	45	/* non-cached or cached region */
	46	struct ocm_region {
	47	phys_addr_t phys;
	48	void __iomem *virt;
	49
	50	int memtotal;
	51	int memfree;
	52
	53	rh_info_t *rh;
	54	struct list_head list;
	55	};
	56
	57	struct ocm_info {
	58	int index;
	59	int status;
	60	int ready;
	61
	62	phys_addr_t phys;
	63
	64	int alignment;
	65	int memtotal;
	66	int cache_size;
	67
	68	struct ocm_region nc; /* non-cached region */
	69	struct ocm_region c; /* cached region */
	70	};
	71
	72	static struct ocm_info *ocm_nodes;
	73	static int ocm_count;
	74
	75	static struct ocm_info *ocm_get_node(unsigned int index)
	76	{
	77	if (index >= ocm_count) {
	78	printk(KERN_ERR "PPC4XX OCM: invalid index");
	79	return NULL;
	80	}
	81
	82	return &ocm_nodes[index];
	83	}
	84
	85	static int ocm_free_region(struct ocm_region ocm_reg, const void addr)
	86	{
	87	struct ocm_block blk, tmp;
	88	unsigned long offset;
	89
	90	if (!ocm_reg->virt)
	91	return 0;
	92
	93	list_for_each_entry_safe(blk, tmp, &ocm_reg->list, list) {
94	if (blk->addr == addr) {
95	offset = addr - ocm_reg->virt;
96	ocm_reg->memfree += blk->size;
97	rh_free(ocm_reg->rh, offset);
98	list_del(&blk->list);
99	kfree(blk);
100	return 1;
101	}
102	}
103
104	return 0;
105	}
106
107	static void __init ocm_init_node(int count, struct device_node *node)
108	{
109	struct ocm_info *ocm;
110
111	const unsigned int *cell_index;
112	const unsigned int *cache_size;
113	int len;
114
115	struct resource rsrc;
116	int ioflags;
117
118	ocm = ocm_get_node(count);
119
120	cell_index = of_get_property(node, "cell-index", &len);
121	if (!cell_index) {
122	printk(KERN_ERR "PPC4XX OCM: missing cell-index property");
123	return;
124	}
125	ocm->index = *cell_index;
126
127	if (of_device_is_available(node))
128	ocm->status = OCM_ENABLED;
129
130	cache_size = of_get_property(node, "cached-region-size", &len);
131	if (cache_size)
132	ocm->cache_size = *cache_size;
133
134	if (of_address_to_resource(node, 0, &rsrc)) {
135	printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n",
136	ocm->index);
137	return;
138	}
139
140	ocm->phys = rsrc.start;
141	ocm->memtotal = (rsrc.end - rsrc.start + 1);
142
143	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n",
144	ocm->index, ocm->memtotal,
145	(ocm->status == OCM_DISABLED) ? "disabled" : "enabled");
146
147	if (ocm->status == OCM_DISABLED)
148	return;
149
150	/* request region */
151
152	if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) {
153	printk(KERN_ERR "PPC4XX OCM%d: could not request region\n",
154	ocm->index);
155	return;
156	}
157
158	/* Configure non-cached and cached regions */
159
160	ocm->nc.phys = ocm->phys;
161	ocm->nc.memtotal = ocm->memtotal - ocm->cache_size;
162	ocm->nc.memfree = ocm->nc.memtotal;
163
164	ocm->c.phys = ocm->phys + ocm->nc.memtotal;
165	ocm->c.memtotal = ocm->cache_size;
166	ocm->c.memfree = ocm->c.memtotal;
167
168	if (ocm->nc.memtotal == 0)
169	ocm->nc.phys = 0;
170
171	if (ocm->c.memtotal == 0)
172	ocm->c.phys = 0;
173
174	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n",
175	ocm->index, ocm->nc.memtotal);
176
177	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n",
178	ocm->index, ocm->c.memtotal);
179
180	/* ioremap the non-cached region */
181	if (ocm->nc.memtotal) {
182	ioflags = _PAGE_NO_CACHE \| _PAGE_GUARDED \| _PAGE_EXEC;
183	ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
184	ioflags);
185
186	if (!ocm->nc.virt) {
187	printk(KERN_ERR
188	"PPC4XX OCM%d: failed to ioremap non-cached memory\n",
189	ocm->index);
190	ocm->nc.memfree = 0;
191	return;
192	}
193	}
194
195	/* ioremap the cached region */
196
197	if (ocm->c.memtotal) {
198	ioflags = _PAGE_EXEC;
199	ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
200	ioflags);
201
202	if (!ocm->c.virt) {
203	printk(KERN_ERR
204	"PPC4XX OCM%d: failed to ioremap cached memory\n",
205	ocm->index);
206	ocm->c.memfree = 0;
207	return;
208	}
209	}
210
211	/* Create Remote Heaps */
212
213	ocm->alignment = 4; /* default 4 byte alignment */
214
215	if (ocm->nc.virt) {
216	ocm->nc.rh = rh_create(ocm->alignment);
217	rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal);
218	}
219
220	if (ocm->c.virt) {
221	ocm->c.rh = rh_create(ocm->alignment);
222	rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal);
223	}
224
225	INIT_LIST_HEAD(&ocm->nc.list);
226	INIT_LIST_HEAD(&ocm->c.list);
227
228	ocm->ready = 1;
229
230	return;
231	}
232
233	static int ocm_debugfs_show(struct seq_file m, void v)
234	{
235	struct ocm_block blk, tmp;
236	unsigned int i;
237
238	for (i = 0; i < ocm_count; i++) {
239	struct ocm_info *ocm = ocm_get_node(i);
240
241	if (!ocm \|\| !ocm->ready)
242	continue;
243
244	seq_printf(m, "PPC4XX OCM : %d\n", ocm->index);
245	seq_printf(m, "PhysAddr : 0x%llx\n", ocm->phys);
246	seq_printf(m, "MemTotal : %d Bytes\n", ocm->memtotal);
247	seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal);
248	seq_printf(m, "MemTotal(C) : %d Bytes\n", ocm->c.memtotal);
249
250	seq_printf(m, "\n");
251
252	seq_printf(m, "NC.PhysAddr : 0x%llx\n", ocm->nc.phys);
253	seq_printf(m, "NC.VirtAddr : 0x%p\n", ocm->nc.virt);
254	seq_printf(m, "NC.MemTotal : %d Bytes\n", ocm->nc.memtotal);
255	seq_printf(m, "NC.MemFree : %d Bytes\n", ocm->nc.memfree);
256
257	list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) {
258	seq_printf(m, "NC.MemUsed : %d Bytes (%s)\n",
259	blk->size, blk->owner);
260	}
261
262	seq_printf(m, "\n");
263
264	seq_printf(m, "C.PhysAddr : 0x%llx\n", ocm->c.phys);
265	seq_printf(m, "C.VirtAddr : 0x%p\n", ocm->c.virt);
266	seq_printf(m, "C.MemTotal : %d Bytes\n", ocm->c.memtotal);
267	seq_printf(m, "C.MemFree : %d Bytes\n", ocm->c.memfree);
268
269	list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) {
270	seq_printf(m, "C.MemUsed : %d Bytes (%s)\n",
271	blk->size, blk->owner);
272	}
273
274	seq_printf(m, "\n");
275	}
276
277	return 0;
278	}
279
280	static int ocm_debugfs_open(struct inode inode, struct file file)
281	{
282	return single_open(file, ocm_debugfs_show, NULL);
283	}
284
285	static const struct file_operations ocm_debugfs_fops = {
286	.open = ocm_debugfs_open,
287	.read = seq_read,
288	.llseek = seq_lseek,
289	.release = single_release,
290	};
291
292	static int ocm_debugfs_init(void)
293	{
294	struct dentry *junk;
295
296	junk = debugfs_create_dir("ppc4xx_ocm", 0);
297	if (!junk) {
298	printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
299	return -1;
300	}
301
302	if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
303	printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
304	return -1;
305	}
306
307	return 0;
308	}
309
310	void ppc4xx_ocm_alloc(phys_addr_t phys, int size, int align,
311	int flags, const char *owner)
312	{
313	void __iomem *addr = NULL;
314	unsigned long offset;
315	struct ocm_info *ocm;
316	struct ocm_region *ocm_reg;
317	struct ocm_block *ocm_blk;
318	int i;
319
320	for (i = 0; i < ocm_count; i++) {
321	ocm = ocm_get_node(i);
322
323	if (!ocm \|\| !ocm->ready)
324	continue;
325
326	if (flags == PPC4XX_OCM_NON_CACHED)
327	ocm_reg = &ocm->nc;
328	else
329	ocm_reg = &ocm->c;
330
331	if (!ocm_reg->virt)
332	continue;
333
334	if (align < ocm->alignment)
335	align = ocm->alignment;
336
337	offset = rh_alloc_align(ocm_reg->rh, size, align, NULL);
338
339	if (IS_ERR_VALUE(offset))
340	continue;
341
1b429835	342	ocm_blk = kzalloc(sizeof(struct ocm_block), GFP_KERNEL);
c19d8248 VNHT	343	if (!ocm_blk) {
	344	printk(KERN_ERR "PPC4XX OCM: could not allocate ocm block");
	345	rh_free(ocm_reg->rh, offset);
	346	break;
	347	}
	348
	349	*phys = ocm_reg->phys + offset;
	350	addr = ocm_reg->virt + offset;
	351	size = ALIGN(size, align);
	352
	353	ocm_blk->addr = addr;
	354	ocm_blk->size = size;
	355	ocm_blk->owner = owner;
	356	list_add_tail(&ocm_blk->list, &ocm_reg->list);
	357
	358	ocm_reg->memfree -= size;
	359
	360	break;
	361	}
	362
	363	return addr;
	364	}
	365
	366	void ppc4xx_ocm_free(const void *addr)
	367	{
	368	int i;
	369
	370	if (!addr)
	371	return;
	372
	373	for (i = 0; i < ocm_count; i++) {
	374	struct ocm_info *ocm = ocm_get_node(i);
	375
	376	if (!ocm \|\| !ocm->ready)
	377	continue;
	378
	379	if (ocm_free_region(&ocm->nc, addr) \|\|
	380	ocm_free_region(&ocm->c, addr))
	381	return;
	382	}
	383	}
	384
	385	static int __init ppc4xx_ocm_init(void)
	386	{
	387	struct device_node *np;
	388	int count;
	389
	390	count = 0;
	391	for_each_compatible_node(np, NULL, "ibm,ocm")
	392	count++;
	393
	394	if (!count)
	395	return 0;
	396
	397	ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL);
	398	if (!ocm_nodes) {
	399	printk(KERN_ERR "PPC4XX OCM: failed to allocate OCM nodes!\n");
	400	return -ENOMEM;
	401	}
	402
	403	ocm_count = count;
	404	count = 0;
	405
	406	for_each_compatible_node(np, NULL, "ibm,ocm") {
407	ocm_init_node(count, np);
408	count++;
409	}
410
411	ocm_debugfs_init();
412
413	return 0;
414	}
415
416	arch_initcall(ppc4xx_ocm_init);