[linux-2.6-block.git] / arch / powerpc / platforms / 4xx / 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;

	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) {
		ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
			_PAGE_EXEC | pgprot_val(PAGE_KERNEL_NCG));

		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) {
		ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
					_PAGE_EXEC | pgprot_val(PAGE_KERNEL));

		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;
}

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     : %pa[p]\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\n", ocm->c.memtotal);

		seq_printf(m, "NC.PhysAddr  : %pa[p]\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, "\nC.PhysAddr   : %pa[p]\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_putc(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(*ocm_blk), GFP_KERNEL);
		if (!ocm_blk) {
			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)
		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;
c19d8248 VNHT	116
	117	ocm = ocm_get_node(count);
	118
	119	cell_index = of_get_property(node, "cell-index", &len);
	120	if (!cell_index) {
	121	printk(KERN_ERR "PPC4XX OCM: missing cell-index property");
	122	return;
	123	}
	124	ocm->index = *cell_index;
	125
	126	if (of_device_is_available(node))
	127	ocm->status = OCM_ENABLED;
	128
	129	cache_size = of_get_property(node, "cached-region-size", &len);
	130	if (cache_size)
	131	ocm->cache_size = *cache_size;
	132
	133	if (of_address_to_resource(node, 0, &rsrc)) {
	134	printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n",
	135	ocm->index);
	136	return;
	137	}
	138
	139	ocm->phys = rsrc.start;
	140	ocm->memtotal = (rsrc.end - rsrc.start + 1);
	141
	142	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n",
	143	ocm->index, ocm->memtotal,
	144	(ocm->status == OCM_DISABLED) ? "disabled" : "enabled");
	145
	146	if (ocm->status == OCM_DISABLED)
	147	return;
	148
	149	/* request region */
	150
	151	if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) {
	152	printk(KERN_ERR "PPC4XX OCM%d: could not request region\n",
	153	ocm->index);
	154	return;
	155	}
	156
	157	/* Configure non-cached and cached regions */
	158
	159	ocm->nc.phys = ocm->phys;
	160	ocm->nc.memtotal = ocm->memtotal - ocm->cache_size;
	161	ocm->nc.memfree = ocm->nc.memtotal;
	162
	163	ocm->c.phys = ocm->phys + ocm->nc.memtotal;
	164	ocm->c.memtotal = ocm->cache_size;
	165	ocm->c.memfree = ocm->c.memtotal;
	166
	167	if (ocm->nc.memtotal == 0)
	168	ocm->nc.phys = 0;
	169
	170	if (ocm->c.memtotal == 0)
	171	ocm->c.phys = 0;
	172
	173	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n",
	174	ocm->index, ocm->nc.memtotal);
	175
	176	printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n",
	177	ocm->index, ocm->c.memtotal);
	178
	179	/* ioremap the non-cached region */
180	if (ocm->nc.memtotal) {
c19d8248	181	ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
d0757237	182	_PAGE_EXEC \| pgprot_val(PAGE_KERNEL_NCG));
c19d8248 VNHT	183
	184	if (!ocm->nc.virt) {
	185	printk(KERN_ERR
	186	"PPC4XX OCM%d: failed to ioremap non-cached memory\n",
	187	ocm->index);
	188	ocm->nc.memfree = 0;
	189	return;
	190	}
	191	}
	192
	193	/* ioremap the cached region */
	194
	195	if (ocm->c.memtotal) {
c19d8248	196	ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
d0757237	197	_PAGE_EXEC \| pgprot_val(PAGE_KERNEL));
c19d8248 VNHT	198
	199	if (!ocm->c.virt) {
	200	printk(KERN_ERR
	201	"PPC4XX OCM%d: failed to ioremap cached memory\n",
	202	ocm->index);
	203	ocm->c.memfree = 0;
	204	return;
	205	}
	206	}
	207
	208	/* Create Remote Heaps */
	209
	210	ocm->alignment = 4; /* default 4 byte alignment */
	211
	212	if (ocm->nc.virt) {
	213	ocm->nc.rh = rh_create(ocm->alignment);
	214	rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal);
	215	}
	216
	217	if (ocm->c.virt) {
	218	ocm->c.rh = rh_create(ocm->alignment);
	219	rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal);
	220	}
	221
	222	INIT_LIST_HEAD(&ocm->nc.list);
	223	INIT_LIST_HEAD(&ocm->c.list);
	224
	225	ocm->ready = 1;
c19d8248 VNHT	226	}
	227
	228	static int ocm_debugfs_show(struct seq_file m, void v)
	229	{
	230	struct ocm_block blk, tmp;
	231	unsigned int i;
	232
	233	for (i = 0; i < ocm_count; i++) {
	234	struct ocm_info *ocm = ocm_get_node(i);
	235
	236	if (!ocm \|\| !ocm->ready)
	237	continue;
	238
	239	seq_printf(m, "PPC4XX OCM : %d\n", ocm->index);
52b88fa1	240	seq_printf(m, "PhysAddr : %pa[p]\n", &(ocm->phys));
c19d8248 VNHT	241	seq_printf(m, "MemTotal : %d Bytes\n", ocm->memtotal);
c19d8248 VNHT	242	seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal);
b52106a0	243	seq_printf(m, "MemTotal(C) : %d Bytes\n\n", ocm->c.memtotal);
c19d8248	244
52b88fa1	245	seq_printf(m, "NC.PhysAddr : %pa[p]\n", &(ocm->nc.phys));
c19d8248 VNHT	246	seq_printf(m, "NC.VirtAddr : 0x%p\n", ocm->nc.virt);
	247	seq_printf(m, "NC.MemTotal : %d Bytes\n", ocm->nc.memtotal);
	248	seq_printf(m, "NC.MemFree : %d Bytes\n", ocm->nc.memfree);
	249
	250	list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) {
	251	seq_printf(m, "NC.MemUsed : %d Bytes (%s)\n",
	252	blk->size, blk->owner);
	253	}
	254
52b88fa1	255	seq_printf(m, "\nC.PhysAddr : %pa[p]\n", &(ocm->c.phys));
c19d8248 VNHT	256	seq_printf(m, "C.VirtAddr : 0x%p\n", ocm->c.virt);
	257	seq_printf(m, "C.MemTotal : %d Bytes\n", ocm->c.memtotal);
	258	seq_printf(m, "C.MemFree : %d Bytes\n", ocm->c.memfree);
	259
	260	list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) {
	261	seq_printf(m, "C.MemUsed : %d Bytes (%s)\n",
	262	blk->size, blk->owner);
	263	}
	264
52930bc6	265	seq_putc(m, '\n');
c19d8248 VNHT	266	}
	267
	268	return 0;
	269	}
	270
	271	static int ocm_debugfs_open(struct inode inode, struct file file)
	272	{
	273	return single_open(file, ocm_debugfs_show, NULL);
	274	}
	275
	276	static const struct file_operations ocm_debugfs_fops = {
	277	.open = ocm_debugfs_open,
	278	.read = seq_read,
	279	.llseek = seq_lseek,
	280	.release = single_release,
	281	};
	282
	283	static int ocm_debugfs_init(void)
	284	{
	285	struct dentry *junk;
	286
	287	junk = debugfs_create_dir("ppc4xx_ocm", 0);
	288	if (!junk) {
	289	printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
	290	return -1;
	291	}
	292
	293	if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
	294	printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
	295	return -1;
	296	}
	297
	298	return 0;
	299	}
	300
	301	void ppc4xx_ocm_alloc(phys_addr_t phys, int size, int align,
	302	int flags, const char *owner)
	303	{
	304	void __iomem *addr = NULL;
	305	unsigned long offset;
	306	struct ocm_info *ocm;
	307	struct ocm_region *ocm_reg;
	308	struct ocm_block *ocm_blk;
	309	int i;
	310
	311	for (i = 0; i < ocm_count; i++) {
	312	ocm = ocm_get_node(i);
	313
	314	if (!ocm \|\| !ocm->ready)
	315	continue;
	316
	317	if (flags == PPC4XX_OCM_NON_CACHED)
	318	ocm_reg = &ocm->nc;
	319	else
	320	ocm_reg = &ocm->c;
	321
	322	if (!ocm_reg->virt)
	323	continue;
	324
	325	if (align < ocm->alignment)
	326	align = ocm->alignment;
	327
	328	offset = rh_alloc_align(ocm_reg->rh, size, align, NULL);
	329
330	if (IS_ERR_VALUE(offset))
331	continue;
332
a0828cf5	333	ocm_blk = kzalloc(sizeof(*ocm_blk), GFP_KERNEL);
c19d8248	334	if (!ocm_blk) {
c19d8248 VNHT	335	rh_free(ocm_reg->rh, offset);
	336	break;
	337	}
	338
	339	*phys = ocm_reg->phys + offset;
	340	addr = ocm_reg->virt + offset;
	341	size = ALIGN(size, align);
	342
	343	ocm_blk->addr = addr;
	344	ocm_blk->size = size;
	345	ocm_blk->owner = owner;
	346	list_add_tail(&ocm_blk->list, &ocm_reg->list);
	347
	348	ocm_reg->memfree -= size;
	349
	350	break;
	351	}
	352
	353	return addr;
	354	}
	355
	356	void ppc4xx_ocm_free(const void *addr)
	357	{
	358	int i;
	359
	360	if (!addr)
	361	return;
	362
	363	for (i = 0; i < ocm_count; i++) {
	364	struct ocm_info *ocm = ocm_get_node(i);
	365
	366	if (!ocm \|\| !ocm->ready)
	367	continue;
	368
	369	if (ocm_free_region(&ocm->nc, addr) \|\|
	370	ocm_free_region(&ocm->c, addr))
	371	return;
	372	}
	373	}
	374
	375	static int __init ppc4xx_ocm_init(void)
	376	{
	377	struct device_node *np;
	378	int count;
	379
	380	count = 0;
	381	for_each_compatible_node(np, NULL, "ibm,ocm")
	382	count++;
	383
	384	if (!count)
	385	return 0;
	386
	387	ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL);
a8d5dada	388	if (!ocm_nodes)
c19d8248	389	return -ENOMEM;
c19d8248 VNHT	390
	391	ocm_count = count;
	392	count = 0;
	393
	394	for_each_compatible_node(np, NULL, "ibm,ocm") {
	395	ocm_init_node(count, np);
	396	count++;
	397	}
	398
	399	ocm_debugfs_init();
	400
	401	return 0;
	402	}
	403
	404	arch_initcall(ppc4xx_ocm_init);