[linux-2.6-block.git] / drivers / misc / sram.c

/*
 * Generic on-chip SRAM allocation driver
 *
 * Copyright (C) 2012 Philipp Zabel, Pengutronix
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/list_sort.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/mfd/syscon.h>
#include <soc/at91/atmel-secumod.h>

#define SRAM_GRANULARITY	32

struct sram_partition {
	void __iomem *base;

	struct gen_pool *pool;
	struct bin_attribute battr;
	struct mutex lock;
};

struct sram_dev {
	struct device *dev;
	void __iomem *virt_base;

	struct gen_pool *pool;
	struct clk *clk;

	struct sram_partition *partition;
	u32 partitions;
};

struct sram_reserve {
	struct list_head list;
	u32 start;
	u32 size;
	bool export;
	bool pool;
	const char *label;
};

static ssize_t sram_read(struct file *filp, struct kobject *kobj,
			 struct bin_attribute *attr,
			 char *buf, loff_t pos, size_t count)
{
	struct sram_partition *part;

	part = container_of(attr, struct sram_partition, battr);

	mutex_lock(&part->lock);
	memcpy_fromio(buf, part->base + pos, count);
	mutex_unlock(&part->lock);

	return count;
}

static ssize_t sram_write(struct file *filp, struct kobject *kobj,
			  struct bin_attribute *attr,
			  char *buf, loff_t pos, size_t count)
{
	struct sram_partition *part;

	part = container_of(attr, struct sram_partition, battr);

	mutex_lock(&part->lock);
	memcpy_toio(part->base + pos, buf, count);
	mutex_unlock(&part->lock);

	return count;
}

static int sram_add_pool(struct sram_dev *sram, struct sram_reserve *block,
			 phys_addr_t start, struct sram_partition *part)
{
	int ret;

	part->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
					  NUMA_NO_NODE, block->label);
	if (IS_ERR(part->pool))
		return PTR_ERR(part->pool);

	ret = gen_pool_add_virt(part->pool, (unsigned long)part->base, start,
				block->size, NUMA_NO_NODE);
	if (ret < 0) {
		dev_err(sram->dev, "failed to register subpool: %d\n", ret);
		return ret;
	}

	return 0;
}

static int sram_add_export(struct sram_dev *sram, struct sram_reserve *block,
			   phys_addr_t start, struct sram_partition *part)
{
	sysfs_bin_attr_init(&part->battr);
	part->battr.attr.name = devm_kasprintf(sram->dev, GFP_KERNEL,
					       "%llx.sram",
					       (unsigned long long)start);
	if (!part->battr.attr.name)
		return -ENOMEM;

	part->battr.attr.mode = S_IRUSR | S_IWUSR;
	part->battr.read = sram_read;
	part->battr.write = sram_write;
	part->battr.size = block->size;

	return device_create_bin_file(sram->dev, &part->battr);
}

static int sram_add_partition(struct sram_dev *sram, struct sram_reserve *block,
			      phys_addr_t start)
{
	int ret;
	struct sram_partition *part = &sram->partition[sram->partitions];

	mutex_init(&part->lock);
	part->base = sram->virt_base + block->start;

	if (block->pool) {
		ret = sram_add_pool(sram, block, start, part);
		if (ret)
			return ret;
	}
	if (block->export) {
		ret = sram_add_export(sram, block, start, part);
		if (ret)
			return ret;
	}
	sram->partitions++;

	return 0;
}

static void sram_free_partitions(struct sram_dev *sram)
{
	struct sram_partition *part;

	if (!sram->partitions)
		return;

	part = &sram->partition[sram->partitions - 1];
	for (; sram->partitions; sram->partitions--, part--) {
		if (part->battr.size)
			device_remove_bin_file(sram->dev, &part->battr);

		if (part->pool &&
		    gen_pool_avail(part->pool) < gen_pool_size(part->pool))
			dev_err(sram->dev, "removed pool while SRAM allocated\n");
	}
}

static int sram_reserve_cmp(void *priv, struct list_head *a,
					struct list_head *b)
{
	struct sram_reserve *ra = list_entry(a, struct sram_reserve, list);
	struct sram_reserve *rb = list_entry(b, struct sram_reserve, list);

	return ra->start - rb->start;
}

static int sram_reserve_regions(struct sram_dev *sram, struct resource *res)
{
	struct device_node *np = sram->dev->of_node, *child;
	unsigned long size, cur_start, cur_size;
	struct sram_reserve *rblocks, *block;
	struct list_head reserve_list;
	unsigned int nblocks, exports = 0;
	const char *label;
	int ret = 0;

	INIT_LIST_HEAD(&reserve_list);

	size = resource_size(res);

	/*
	 * We need an additional block to mark the end of the memory region
	 * after the reserved blocks from the dt are processed.
	 */
	nblocks = (np) ? of_get_available_child_count(np) + 1 : 1;
	rblocks = kzalloc((nblocks) * sizeof(*rblocks), GFP_KERNEL);
	if (!rblocks)
		return -ENOMEM;

	block = &rblocks[0];
	for_each_available_child_of_node(np, child) {
		struct resource child_res;

		ret = of_address_to_resource(child, 0, &child_res);
		if (ret < 0) {
			dev_err(sram->dev,
				"could not get address for node %s\n",
				child->full_name);
			goto err_chunks;
		}

		if (child_res.start < res->start || child_res.end > res->end) {
			dev_err(sram->dev,
				"reserved block %s outside the sram area\n",
				child->full_name);
			ret = -EINVAL;
			goto err_chunks;
		}

		block->start = child_res.start - res->start;
		block->size = resource_size(&child_res);
		list_add_tail(&block->list, &reserve_list);

		if (of_find_property(child, "export", NULL))
			block->export = true;

		if (of_find_property(child, "pool", NULL))
			block->pool = true;

		if ((block->export || block->pool) && block->size) {
			exports++;

			label = NULL;
			ret = of_property_read_string(child, "label", &label);
			if (ret && ret != -EINVAL) {
				dev_err(sram->dev,
					"%s has invalid label name\n",
					child->full_name);
				goto err_chunks;
			}
			if (!label)
				label = child->name;

			block->label = devm_kstrdup(sram->dev,
						    label, GFP_KERNEL);
			if (!block->label)
				goto err_chunks;

			dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",
				block->export ? "exported " : "", block->label,
				block->start, block->start + block->size);
		} else {
			dev_dbg(sram->dev, "found reserved block 0x%x-0x%x\n",
				block->start, block->start + block->size);
		}

		block++;
	}
	child = NULL;

	/* the last chunk marks the end of the region */
	rblocks[nblocks - 1].start = size;
	rblocks[nblocks - 1].size = 0;
	list_add_tail(&rblocks[nblocks - 1].list, &reserve_list);

	list_sort(NULL, &reserve_list, sram_reserve_cmp);

	if (exports) {
		sram->partition = devm_kzalloc(sram->dev,
				       exports * sizeof(*sram->partition),
				       GFP_KERNEL);
		if (!sram->partition) {
			ret = -ENOMEM;
			goto err_chunks;
		}
	}

	cur_start = 0;
	list_for_each_entry(block, &reserve_list, list) {
		/* can only happen if sections overlap */
		if (block->start < cur_start) {
			dev_err(sram->dev,
				"block at 0x%x starts after current offset 0x%lx\n",
				block->start, cur_start);
			ret = -EINVAL;
			sram_free_partitions(sram);
			goto err_chunks;
		}

		if ((block->export || block->pool) && block->size) {
			ret = sram_add_partition(sram, block,
						 res->start + block->start);
			if (ret) {
				sram_free_partitions(sram);
				goto err_chunks;
			}
		}

		/* current start is in a reserved block, so continue after it */
		if (block->start == cur_start) {
			cur_start = block->start + block->size;
			continue;
		}

		/*
		 * allocate the space between the current starting
		 * address and the following reserved block, or the
		 * end of the region.
		 */
		cur_size = block->start - cur_start;

		dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",
			cur_start, cur_start + cur_size);

		ret = gen_pool_add_virt(sram->pool,
				(unsigned long)sram->virt_base + cur_start,
				res->start + cur_start, cur_size, -1);
		if (ret < 0) {
			sram_free_partitions(sram);
			goto err_chunks;
		}

		/* next allocation after this reserved block */
		cur_start = block->start + block->size;
	}

 err_chunks:
	if (child)
		of_node_put(child);

	kfree(rblocks);

	return ret;
}

static int atmel_securam_wait(void)
{
	struct regmap *regmap;
	u32 val;

	regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-secumod");
	if (IS_ERR(regmap))
		return -ENODEV;

	return regmap_read_poll_timeout(regmap, AT91_SECUMOD_RAMRDY, val,
					val & AT91_SECUMOD_RAMRDY_READY,
					10000, 500000);
}

static const struct of_device_id sram_dt_ids[] = {
	{ .compatible = "mmio-sram" },
	{ .compatible = "atmel,sama5d2-securam", .data = atmel_securam_wait },
	{}
};

static int sram_probe(struct platform_device *pdev)
{
	struct sram_dev *sram;
	struct resource *res;
	size_t size;
	int ret;
	int (*init_func)(void);

	sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);
	if (!sram)
		return -ENOMEM;

	sram->dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(sram->dev, "found no memory resource\n");
		return -EINVAL;
	}

	size = resource_size(res);

	if (!devm_request_mem_region(sram->dev, res->start, size, pdev->name)) {
		dev_err(sram->dev, "could not request region for resource\n");
		return -EBUSY;
	}

	if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))
		sram->virt_base = devm_ioremap(sram->dev, res->start, size);
	else
		sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);
	if (!sram->virt_base)
		return -ENOMEM;

	sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
					  NUMA_NO_NODE, NULL);
	if (IS_ERR(sram->pool))
		return PTR_ERR(sram->pool);

	ret = sram_reserve_regions(sram, res);
	if (ret)
		return ret;

	sram->clk = devm_clk_get(sram->dev, NULL);
	if (IS_ERR(sram->clk))
		sram->clk = NULL;
	else
		clk_prepare_enable(sram->clk);

	platform_set_drvdata(pdev, sram);

	init_func = of_device_get_match_data(&pdev->dev);
	if (init_func) {
		ret = init_func();
		if (ret)
			return ret;
	}

	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
		gen_pool_size(sram->pool) / 1024, sram->virt_base);

	return 0;
}

static int sram_remove(struct platform_device *pdev)
{
	struct sram_dev *sram = platform_get_drvdata(pdev);

	sram_free_partitions(sram);

	if (gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
		dev_err(sram->dev, "removed while SRAM allocated\n");

	if (sram->clk)
		clk_disable_unprepare(sram->clk);

	return 0;
}

static struct platform_driver sram_driver = {
	.driver = {
		.name = "sram",
		.of_match_table = sram_dt_ids,
	},
	.probe = sram_probe,
	.remove = sram_remove,
};

static int __init sram_init(void)
{
	return platform_driver_register(&sram_driver);
}

postcore_initcall(sram_init);
Commit	Line	Data
4984c6f5 PZ	1	/*
	2	* Generic on-chip SRAM allocation driver
	3	*
	4	* Copyright (C) 2012 Philipp Zabel, Pengutronix
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version 2
	9	* of the License, or (at your option) any later version.
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	18	* MA 02110-1301, USA.
	19	*/
	20
4984c6f5	21	#include <linux/clk.h>
2ae2e288	22	#include <linux/delay.h>
98ce2d27	23	#include <linux/genalloc.h>
4984c6f5	24	#include <linux/io.h>
2da19688	25	#include <linux/list_sort.h>
98ce2d27	26	#include <linux/of_address.h>
2ae2e288	27	#include <linux/of_device.h>
4984c6f5	28	#include <linux/platform_device.h>
2ae2e288	29	#include <linux/regmap.h>
4984c6f5	30	#include <linux/slab.h>
2ae2e288 AB	31	#include <linux/mfd/syscon.h>
2ae2e288 AB	32	#include <soc/at91/atmel-secumod.h>
4984c6f5 PZ	33
	34	#define SRAM_GRANULARITY 32
	35
b4c3fcb3	36	struct sram_partition {
525d12f2	37	void __iomem *base;
b4c3fcb3 VZ	38
	39	struct gen_pool *pool;
	40	struct bin_attribute battr;
	41	struct mutex lock;
	42	};
	43
4984c6f5	44	struct sram_dev {
665d82fb VZ	45	struct device *dev;
	46	void __iomem *virt_base;
	47
4984c6f5 PZ	48	struct gen_pool *pool;
4984c6f5 PZ	49	struct clk *clk;
b4c3fcb3 VZ	50
	51	struct sram_partition *partition;
	52	u32 partitions;
4984c6f5 PZ	53	};
4984c6f5 PZ	54
2da19688 HS	55	struct sram_reserve {
	56	struct list_head list;
	57	u32 start;
	58	u32 size;
b4c3fcb3 VZ	59	bool export;
	60	bool pool;
	61	const char *label;
2da19688 HS	62	};
2da19688 HS	63
b4c3fcb3 VZ	64	static ssize_t sram_read(struct file filp, struct kobject kobj,
	65	struct bin_attribute *attr,
	66	char *buf, loff_t pos, size_t count)
	67	{
	68	struct sram_partition *part;
	69
	70	part = container_of(attr, struct sram_partition, battr);
	71
	72	mutex_lock(&part->lock);
525d12f2	73	memcpy_fromio(buf, part->base + pos, count);
b4c3fcb3 VZ	74	mutex_unlock(&part->lock);
	75
	76	return count;
	77	}
	78
	79	static ssize_t sram_write(struct file filp, struct kobject kobj,
	80	struct bin_attribute *attr,
	81	char *buf, loff_t pos, size_t count)
	82	{
	83	struct sram_partition *part;
	84
	85	part = container_of(attr, struct sram_partition, battr);
	86
	87	mutex_lock(&part->lock);
525d12f2	88	memcpy_toio(part->base + pos, buf, count);
b4c3fcb3 VZ	89	mutex_unlock(&part->lock);
	90
	91	return count;
	92	}
	93
	94	static int sram_add_pool(struct sram_dev sram, struct sram_reserve block,
	95	phys_addr_t start, struct sram_partition *part)
	96	{
	97	int ret;
	98
	99	part->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
	100	NUMA_NO_NODE, block->label);
	101	if (IS_ERR(part->pool))
	102	return PTR_ERR(part->pool);
	103
	104	ret = gen_pool_add_virt(part->pool, (unsigned long)part->base, start,
	105	block->size, NUMA_NO_NODE);
	106	if (ret < 0) {
	107	dev_err(sram->dev, "failed to register subpool: %d\n", ret);
	108	return ret;
	109	}
	110
	111	return 0;
	112	}
	113
	114	static int sram_add_export(struct sram_dev sram, struct sram_reserve block,
	115	phys_addr_t start, struct sram_partition *part)
	116	{
	117	sysfs_bin_attr_init(&part->battr);
	118	part->battr.attr.name = devm_kasprintf(sram->dev, GFP_KERNEL,
	119	"%llx.sram",
	120	(unsigned long long)start);
	121	if (!part->battr.attr.name)
	122	return -ENOMEM;
	123
	124	part->battr.attr.mode = S_IRUSR \| S_IWUSR;
	125	part->battr.read = sram_read;
	126	part->battr.write = sram_write;
	127	part->battr.size = block->size;
	128
	129	return device_create_bin_file(sram->dev, &part->battr);
	130	}
	131
	132	static int sram_add_partition(struct sram_dev sram, struct sram_reserve block,
	133	phys_addr_t start)
	134	{
	135	int ret;
	136	struct sram_partition *part = &sram->partition[sram->partitions];
	137
	138	mutex_init(&part->lock);
	139	part->base = sram->virt_base + block->start;
	140
	141	if (block->pool) {
	142	ret = sram_add_pool(sram, block, start, part);
	143	if (ret)
	144	return ret;
	145	}
	146	if (block->export) {
	147	ret = sram_add_export(sram, block, start, part);
	148	if (ret)
	149	return ret;
	150	}
	151	sram->partitions++;
	152
153	return 0;
154	}
155
156	static void sram_free_partitions(struct sram_dev *sram)
157	{
158	struct sram_partition *part;
159
160	if (!sram->partitions)
161	return;
162
163	part = &sram->partition[sram->partitions - 1];
164	for (; sram->partitions; sram->partitions--, part--) {
165	if (part->battr.size)
166	device_remove_bin_file(sram->dev, &part->battr);
167
168	if (part->pool &&
169	gen_pool_avail(part->pool) < gen_pool_size(part->pool))
170	dev_err(sram->dev, "removed pool while SRAM allocated\n");
171	}
172	}
173
2da19688 HS	174	static int sram_reserve_cmp(void priv, struct list_head a,
	175	struct list_head *b)
	176	{
	177	struct sram_reserve *ra = list_entry(a, struct sram_reserve, list);
	178	struct sram_reserve *rb = list_entry(b, struct sram_reserve, list);
	179
	180	return ra->start - rb->start;
	181	}
	182
a0a5be0b	183	static int sram_reserve_regions(struct sram_dev sram, struct resource res)
4984c6f5	184	{
a0a5be0b	185	struct device_node np = sram->dev->of_node, child;
2da19688 HS	186	unsigned long size, cur_start, cur_size;
	187	struct sram_reserve rblocks, block;
	188	struct list_head reserve_list;
b4c3fcb3 VZ	189	unsigned int nblocks, exports = 0;
b4c3fcb3 VZ	190	const char *label;
a0a5be0b	191	int ret = 0;
4984c6f5	192
2da19688 HS	193	INIT_LIST_HEAD(&reserve_list);
2da19688 HS	194
f3cbfa5d	195	size = resource_size(res);
4984c6f5	196
2da19688 HS	197	/*
	198	* We need an additional block to mark the end of the memory region
	199	* after the reserved blocks from the dt are processed.
	200	*/
	201	nblocks = (np) ? of_get_available_child_count(np) + 1 : 1;
b4c3fcb3	202	rblocks = kzalloc((nblocks) * sizeof(*rblocks), GFP_KERNEL);
ee895ccd VZ	203	if (!rblocks)
ee895ccd VZ	204	return -ENOMEM;
4984c6f5	205
2da19688 HS	206	block = &rblocks[0];
	207	for_each_available_child_of_node(np, child) {
	208	struct resource child_res;
	209
	210	ret = of_address_to_resource(child, 0, &child_res);
	211	if (ret < 0) {
665d82fb	212	dev_err(sram->dev,
2da19688 HS	213	"could not get address for node %s\n",
	214	child->full_name);
	215	goto err_chunks;
	216	}
	217
	218	if (child_res.start < res->start \|\| child_res.end > res->end) {
665d82fb	219	dev_err(sram->dev,
2da19688 HS	220	"reserved block %s outside the sram area\n",
	221	child->full_name);
	222	ret = -EINVAL;
	223	goto err_chunks;
	224	}
	225
	226	block->start = child_res.start - res->start;
	227	block->size = resource_size(&child_res);
	228	list_add_tail(&block->list, &reserve_list);
	229
b4c3fcb3 VZ	230	if (of_find_property(child, "export", NULL))
	231	block->export = true;
	232
	233	if (of_find_property(child, "pool", NULL))
	234	block->pool = true;
	235
	236	if ((block->export \|\| block->pool) && block->size) {
	237	exports++;
	238
	239	label = NULL;
	240	ret = of_property_read_string(child, "label", &label);
	241	if (ret && ret != -EINVAL) {
	242	dev_err(sram->dev,
	243	"%s has invalid label name\n",
	244	child->full_name);
	245	goto err_chunks;
	246	}
	247	if (!label)
	248	label = child->name;
	249
	250	block->label = devm_kstrdup(sram->dev,
	251	label, GFP_KERNEL);
	252	if (!block->label)
	253	goto err_chunks;
	254
	255	dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",
	256	block->export ? "exported " : "", block->label,
	257	block->start, block->start + block->size);
	258	} else {
	259	dev_dbg(sram->dev, "found reserved block 0x%x-0x%x\n",
	260	block->start, block->start + block->size);
	261	}
2da19688 HS	262
	263	block++;
	264	}
b4c3fcb3	265	child = NULL;
2da19688 HS	266
	267	/* the last chunk marks the end of the region */
	268	rblocks[nblocks - 1].start = size;
	269	rblocks[nblocks - 1].size = 0;
	270	list_add_tail(&rblocks[nblocks - 1].list, &reserve_list);
	271
	272	list_sort(NULL, &reserve_list, sram_reserve_cmp);
	273
b4c3fcb3 VZ	274	if (exports) {
	275	sram->partition = devm_kzalloc(sram->dev,
	276	exports * sizeof(*sram->partition),
	277	GFP_KERNEL);
	278	if (!sram->partition) {
	279	ret = -ENOMEM;
	280	goto err_chunks;
	281	}
	282	}
2da19688	283
b4c3fcb3	284	cur_start = 0;
2da19688 HS	285	list_for_each_entry(block, &reserve_list, list) {
	286	/* can only happen if sections overlap */
	287	if (block->start < cur_start) {
665d82fb	288	dev_err(sram->dev,
2da19688 HS	289	"block at 0x%x starts after current offset 0x%lx\n",
	290	block->start, cur_start);
	291	ret = -EINVAL;
b4c3fcb3	292	sram_free_partitions(sram);
2da19688 HS	293	goto err_chunks;
	294	}
	295
b4c3fcb3 VZ	296	if ((block->export \|\| block->pool) && block->size) {
	297	ret = sram_add_partition(sram, block,
	298	res->start + block->start);
	299	if (ret) {
	300	sram_free_partitions(sram);
	301	goto err_chunks;
	302	}
	303	}
	304
2da19688 HS	305	/* current start is in a reserved block, so continue after it */
	306	if (block->start == cur_start) {
	307	cur_start = block->start + block->size;
	308	continue;
	309	}
	310
	311	/*
	312	* allocate the space between the current starting
	313	* address and the following reserved block, or the
	314	* end of the region.
	315	*/
	316	cur_size = block->start - cur_start;
	317
665d82fb	318	dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",
2da19688	319	cur_start, cur_start + cur_size);
665d82fb	320
2da19688	321	ret = gen_pool_add_virt(sram->pool,
665d82fb	322	(unsigned long)sram->virt_base + cur_start,
2da19688	323	res->start + cur_start, cur_size, -1);
b4c3fcb3 VZ	324	if (ret < 0) {
b4c3fcb3 VZ	325	sram_free_partitions(sram);
2da19688	326	goto err_chunks;
b4c3fcb3	327	}
2da19688 HS	328
	329	/* next allocation after this reserved block */
	330	cur_start = block->start + block->size;
	331	}
	332
a0a5be0b	333	err_chunks:
b4c3fcb3 VZ	334	if (child)
	335	of_node_put(child);
	336
2da19688 HS	337	kfree(rblocks);
2da19688 HS	338
a0a5be0b VZ	339	return ret;
	340	}
	341
2ae2e288 AB	342	static int atmel_securam_wait(void)
	343	{
	344	struct regmap *regmap;
	345	u32 val;
	346
	347	regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-secumod");
	348	if (IS_ERR(regmap))
	349	return -ENODEV;
	350
	351	return regmap_read_poll_timeout(regmap, AT91_SECUMOD_RAMRDY, val,
	352	val & AT91_SECUMOD_RAMRDY_READY,
	353	10000, 500000);
	354	}
	355
2ae2e288 AB	356	static const struct of_device_id sram_dt_ids[] = {
	357	{ .compatible = "mmio-sram" },
	358	{ .compatible = "atmel,sama5d2-securam", .data = atmel_securam_wait },
	359	{}
	360	};
2ae2e288	361
a0a5be0b VZ	362	static int sram_probe(struct platform_device *pdev)
	363	{
	364	struct sram_dev *sram;
	365	struct resource *res;
	366	size_t size;
	367	int ret;
2ae2e288	368	int (*init_func)(void);
a0a5be0b VZ	369
	370	sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);
	371	if (!sram)
	372	return -ENOMEM;
	373
	374	sram->dev = &pdev->dev;
	375
	376	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	377	if (!res) {
	378	dev_err(sram->dev, "found no memory resource\n");
	379	return -EINVAL;
	380	}
	381
	382	size = resource_size(res);
	383
	384	if (!devm_request_mem_region(sram->dev, res->start, size, pdev->name)) {
	385	dev_err(sram->dev, "could not request region for resource\n");
	386	return -EBUSY;
	387	}
	388
eb43e023 MW	389	if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))
	390	sram->virt_base = devm_ioremap(sram->dev, res->start, size);
	391	else
	392	sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);
d449d69d VZ	393	if (!sram->virt_base)
d449d69d VZ	394	return -ENOMEM;
a0a5be0b	395
73858173 VZ	396	sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
	397	NUMA_NO_NODE, NULL);
	398	if (IS_ERR(sram->pool))
	399	return PTR_ERR(sram->pool);
a0a5be0b VZ	400
	401	ret = sram_reserve_regions(sram, res);
	402	if (ret)
	403	return ret;
	404
665d82fb	405	sram->clk = devm_clk_get(sram->dev, NULL);
ee895ccd VZ	406	if (IS_ERR(sram->clk))
	407	sram->clk = NULL;
	408	else
	409	clk_prepare_enable(sram->clk);
	410
4984c6f5 PZ	411	platform_set_drvdata(pdev, sram);
4984c6f5 PZ	412
2ae2e288 AB	413	init_func = of_device_get_match_data(&pdev->dev);
	414	if (init_func) {
	415	ret = init_func();
	416	if (ret)
	417	return ret;
	418	}
	419
665d82fb VZ	420	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
665d82fb VZ	421	gen_pool_size(sram->pool) / 1024, sram->virt_base);
4984c6f5 PZ	422
	423	return 0;
	424	}
	425
	426	static int sram_remove(struct platform_device *pdev)
	427	{
	428	struct sram_dev *sram = platform_get_drvdata(pdev);
	429
b4c3fcb3 VZ	430	sram_free_partitions(sram);
b4c3fcb3 VZ	431
4984c6f5	432	if (gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
665d82fb	433	dev_err(sram->dev, "removed while SRAM allocated\n");
4984c6f5	434
4984c6f5 PZ	435	if (sram->clk)
	436	clk_disable_unprepare(sram->clk);
	437
	438	return 0;
	439	}
	440
4984c6f5 PZ	441	static struct platform_driver sram_driver = {
	442	.driver = {
	443	.name = "sram",
2aa488a6	444	.of_match_table = sram_dt_ids,
4984c6f5 PZ	445	},
	446	.probe = sram_probe,
	447	.remove = sram_remove,
	448	};
	449
	450	static int __init sram_init(void)
	451	{
	452	return platform_driver_register(&sram_driver);
	453	}
	454
	455	postcore_initcall(sram_init);