[mirror_ubuntu-jammy-kernel.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>

#include "sram.h"

#define SRAM_GRANULARITY	32

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) {
				ret = -ENOMEM;
				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	33
cdd1737c	34	#include "sram.h"
665d82fb	35
cdd1737c	36	#define SRAM_GRANULARITY 32
2da19688	37
b4c3fcb3 VZ	38	static ssize_t sram_read(struct file filp, struct kobject kobj,
	39	struct bin_attribute *attr,
	40	char *buf, loff_t pos, size_t count)
	41	{
	42	struct sram_partition *part;
	43
	44	part = container_of(attr, struct sram_partition, battr);
	45
	46	mutex_lock(&part->lock);
525d12f2	47	memcpy_fromio(buf, part->base + pos, count);
b4c3fcb3 VZ	48	mutex_unlock(&part->lock);
	49
	50	return count;
	51	}
	52
	53	static ssize_t sram_write(struct file filp, struct kobject kobj,
	54	struct bin_attribute *attr,
	55	char *buf, loff_t pos, size_t count)
	56	{
	57	struct sram_partition *part;
	58
	59	part = container_of(attr, struct sram_partition, battr);
	60
	61	mutex_lock(&part->lock);
525d12f2	62	memcpy_toio(part->base + pos, buf, count);
b4c3fcb3 VZ	63	mutex_unlock(&part->lock);
	64
	65	return count;
	66	}
	67
	68	static int sram_add_pool(struct sram_dev sram, struct sram_reserve block,
	69	phys_addr_t start, struct sram_partition *part)
	70	{
	71	int ret;
	72
	73	part->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
	74	NUMA_NO_NODE, block->label);
	75	if (IS_ERR(part->pool))
	76	return PTR_ERR(part->pool);
	77
	78	ret = gen_pool_add_virt(part->pool, (unsigned long)part->base, start,
	79	block->size, NUMA_NO_NODE);
	80	if (ret < 0) {
	81	dev_err(sram->dev, "failed to register subpool: %d\n", ret);
	82	return ret;
	83	}
	84
	85	return 0;
	86	}
	87
	88	static int sram_add_export(struct sram_dev sram, struct sram_reserve block,
	89	phys_addr_t start, struct sram_partition *part)
	90	{
	91	sysfs_bin_attr_init(&part->battr);
	92	part->battr.attr.name = devm_kasprintf(sram->dev, GFP_KERNEL,
	93	"%llx.sram",
	94	(unsigned long long)start);
	95	if (!part->battr.attr.name)
	96	return -ENOMEM;
	97
	98	part->battr.attr.mode = S_IRUSR \| S_IWUSR;
	99	part->battr.read = sram_read;
	100	part->battr.write = sram_write;
	101	part->battr.size = block->size;
	102
	103	return device_create_bin_file(sram->dev, &part->battr);
	104	}
	105
	106	static int sram_add_partition(struct sram_dev sram, struct sram_reserve block,
	107	phys_addr_t start)
	108	{
	109	int ret;
	110	struct sram_partition *part = &sram->partition[sram->partitions];
	111
	112	mutex_init(&part->lock);
	113	part->base = sram->virt_base + block->start;
	114
	115	if (block->pool) {
	116	ret = sram_add_pool(sram, block, start, part);
	117	if (ret)
	118	return ret;
	119	}
	120	if (block->export) {
	121	ret = sram_add_export(sram, block, start, part);
	122	if (ret)
	123	return ret;
	124	}
	125	sram->partitions++;
	126
127	return 0;
128	}
129
130	static void sram_free_partitions(struct sram_dev *sram)
131	{
132	struct sram_partition *part;
133
134	if (!sram->partitions)
135	return;
136
137	part = &sram->partition[sram->partitions - 1];
138	for (; sram->partitions; sram->partitions--, part--) {
139	if (part->battr.size)
140	device_remove_bin_file(sram->dev, &part->battr);
141
142	if (part->pool &&
143	gen_pool_avail(part->pool) < gen_pool_size(part->pool))
144	dev_err(sram->dev, "removed pool while SRAM allocated\n");
145	}
146	}
147
2da19688 HS	148	static int sram_reserve_cmp(void priv, struct list_head a,
	149	struct list_head *b)
	150	{
	151	struct sram_reserve *ra = list_entry(a, struct sram_reserve, list);
	152	struct sram_reserve *rb = list_entry(b, struct sram_reserve, list);
	153
	154	return ra->start - rb->start;
	155	}
	156
a0a5be0b	157	static int sram_reserve_regions(struct sram_dev sram, struct resource res)
4984c6f5	158	{
a0a5be0b	159	struct device_node np = sram->dev->of_node, child;
2da19688 HS	160	unsigned long size, cur_start, cur_size;
	161	struct sram_reserve rblocks, block;
	162	struct list_head reserve_list;
b4c3fcb3 VZ	163	unsigned int nblocks, exports = 0;
b4c3fcb3 VZ	164	const char *label;
a0a5be0b	165	int ret = 0;
4984c6f5	166
2da19688 HS	167	INIT_LIST_HEAD(&reserve_list);
2da19688 HS	168
f3cbfa5d	169	size = resource_size(res);
4984c6f5	170
2da19688 HS	171	/*
	172	* We need an additional block to mark the end of the memory region
	173	* after the reserved blocks from the dt are processed.
	174	*/
	175	nblocks = (np) ? of_get_available_child_count(np) + 1 : 1;
b4c3fcb3	176	rblocks = kzalloc((nblocks) * sizeof(*rblocks), GFP_KERNEL);
ee895ccd VZ	177	if (!rblocks)
ee895ccd VZ	178	return -ENOMEM;
4984c6f5	179
2da19688 HS	180	block = &rblocks[0];
	181	for_each_available_child_of_node(np, child) {
	182	struct resource child_res;
	183
	184	ret = of_address_to_resource(child, 0, &child_res);
	185	if (ret < 0) {
665d82fb	186	dev_err(sram->dev,
2da19688 HS	187	"could not get address for node %s\n",
	188	child->full_name);
	189	goto err_chunks;
	190	}
	191
	192	if (child_res.start < res->start \|\| child_res.end > res->end) {
665d82fb	193	dev_err(sram->dev,
2da19688 HS	194	"reserved block %s outside the sram area\n",
	195	child->full_name);
	196	ret = -EINVAL;
	197	goto err_chunks;
	198	}
	199
	200	block->start = child_res.start - res->start;
	201	block->size = resource_size(&child_res);
	202	list_add_tail(&block->list, &reserve_list);
	203
b4c3fcb3 VZ	204	if (of_find_property(child, "export", NULL))
	205	block->export = true;
	206
	207	if (of_find_property(child, "pool", NULL))
	208	block->pool = true;
	209
	210	if ((block->export \|\| block->pool) && block->size) {
	211	exports++;
	212
	213	label = NULL;
	214	ret = of_property_read_string(child, "label", &label);
	215	if (ret && ret != -EINVAL) {
	216	dev_err(sram->dev,
	217	"%s has invalid label name\n",
	218	child->full_name);
	219	goto err_chunks;
	220	}
	221	if (!label)
	222	label = child->name;
	223
	224	block->label = devm_kstrdup(sram->dev,
	225	label, GFP_KERNEL);
ddc5c9a3 PB	226	if (!block->label) {
ddc5c9a3 PB	227	ret = -ENOMEM;
b4c3fcb3	228	goto err_chunks;
ddc5c9a3	229	}
b4c3fcb3 VZ	230
	231	dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",
	232	block->export ? "exported " : "", block->label,
	233	block->start, block->start + block->size);
	234	} else {
	235	dev_dbg(sram->dev, "found reserved block 0x%x-0x%x\n",
	236	block->start, block->start + block->size);
	237	}
2da19688 HS	238
	239	block++;
	240	}
b4c3fcb3	241	child = NULL;
2da19688 HS	242
	243	/* the last chunk marks the end of the region */
	244	rblocks[nblocks - 1].start = size;
	245	rblocks[nblocks - 1].size = 0;
	246	list_add_tail(&rblocks[nblocks - 1].list, &reserve_list);
	247
	248	list_sort(NULL, &reserve_list, sram_reserve_cmp);
	249
b4c3fcb3 VZ	250	if (exports) {
	251	sram->partition = devm_kzalloc(sram->dev,
	252	exports * sizeof(*sram->partition),
	253	GFP_KERNEL);
	254	if (!sram->partition) {
	255	ret = -ENOMEM;
	256	goto err_chunks;
	257	}
	258	}
2da19688	259
b4c3fcb3	260	cur_start = 0;
2da19688 HS	261	list_for_each_entry(block, &reserve_list, list) {
	262	/* can only happen if sections overlap */
	263	if (block->start < cur_start) {
665d82fb	264	dev_err(sram->dev,
2da19688 HS	265	"block at 0x%x starts after current offset 0x%lx\n",
	266	block->start, cur_start);
	267	ret = -EINVAL;
b4c3fcb3	268	sram_free_partitions(sram);
2da19688 HS	269	goto err_chunks;
	270	}
	271
b4c3fcb3 VZ	272	if ((block->export \|\| block->pool) && block->size) {
	273	ret = sram_add_partition(sram, block,
	274	res->start + block->start);
	275	if (ret) {
	276	sram_free_partitions(sram);
	277	goto err_chunks;
	278	}
	279	}
	280
2da19688 HS	281	/* current start is in a reserved block, so continue after it */
	282	if (block->start == cur_start) {
	283	cur_start = block->start + block->size;
	284	continue;
	285	}
	286
	287	/*
	288	* allocate the space between the current starting
	289	* address and the following reserved block, or the
	290	* end of the region.
	291	*/
	292	cur_size = block->start - cur_start;
	293
665d82fb	294	dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",
2da19688	295	cur_start, cur_start + cur_size);
665d82fb	296
2da19688	297	ret = gen_pool_add_virt(sram->pool,
665d82fb	298	(unsigned long)sram->virt_base + cur_start,
2da19688	299	res->start + cur_start, cur_size, -1);
b4c3fcb3 VZ	300	if (ret < 0) {
b4c3fcb3 VZ	301	sram_free_partitions(sram);
2da19688	302	goto err_chunks;
b4c3fcb3	303	}
2da19688 HS	304
	305	/* next allocation after this reserved block */
	306	cur_start = block->start + block->size;
	307	}
	308
a0a5be0b	309	err_chunks:
b4c3fcb3 VZ	310	if (child)
	311	of_node_put(child);
	312
2da19688 HS	313	kfree(rblocks);
2da19688 HS	314
a0a5be0b VZ	315	return ret;
	316	}
	317
2ae2e288 AB	318	static int atmel_securam_wait(void)
	319	{
	320	struct regmap *regmap;
	321	u32 val;
	322
	323	regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-secumod");
	324	if (IS_ERR(regmap))
	325	return -ENODEV;
	326
	327	return regmap_read_poll_timeout(regmap, AT91_SECUMOD_RAMRDY, val,
	328	val & AT91_SECUMOD_RAMRDY_READY,
	329	10000, 500000);
	330	}
	331
2ae2e288 AB	332	static const struct of_device_id sram_dt_ids[] = {
	333	{ .compatible = "mmio-sram" },
	334	{ .compatible = "atmel,sama5d2-securam", .data = atmel_securam_wait },
	335	{}
	336	};
2ae2e288	337
a0a5be0b VZ	338	static int sram_probe(struct platform_device *pdev)
	339	{
	340	struct sram_dev *sram;
	341	struct resource *res;
	342	size_t size;
	343	int ret;
2ae2e288	344	int (*init_func)(void);
a0a5be0b VZ	345
	346	sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);
	347	if (!sram)
	348	return -ENOMEM;
	349
	350	sram->dev = &pdev->dev;
	351
	352	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	353	if (!res) {
	354	dev_err(sram->dev, "found no memory resource\n");
	355	return -EINVAL;
	356	}
	357
	358	size = resource_size(res);
	359
	360	if (!devm_request_mem_region(sram->dev, res->start, size, pdev->name)) {
	361	dev_err(sram->dev, "could not request region for resource\n");
	362	return -EBUSY;
	363	}
	364
eb43e023 MW	365	if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))
	366	sram->virt_base = devm_ioremap(sram->dev, res->start, size);
	367	else
	368	sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);
d449d69d VZ	369	if (!sram->virt_base)
d449d69d VZ	370	return -ENOMEM;
a0a5be0b	371
73858173 VZ	372	sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
	373	NUMA_NO_NODE, NULL);
	374	if (IS_ERR(sram->pool))
	375	return PTR_ERR(sram->pool);
a0a5be0b VZ	376
	377	ret = sram_reserve_regions(sram, res);
	378	if (ret)
	379	return ret;
	380
665d82fb	381	sram->clk = devm_clk_get(sram->dev, NULL);
ee895ccd VZ	382	if (IS_ERR(sram->clk))
	383	sram->clk = NULL;
	384	else
	385	clk_prepare_enable(sram->clk);
	386
4984c6f5 PZ	387	platform_set_drvdata(pdev, sram);
4984c6f5 PZ	388
2ae2e288 AB	389	init_func = of_device_get_match_data(&pdev->dev);
	390	if (init_func) {
	391	ret = init_func();
	392	if (ret)
	393	return ret;
	394	}
	395
665d82fb VZ	396	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
665d82fb VZ	397	gen_pool_size(sram->pool) / 1024, sram->virt_base);
4984c6f5 PZ	398
	399	return 0;
	400	}
	401
	402	static int sram_remove(struct platform_device *pdev)
	403	{
	404	struct sram_dev *sram = platform_get_drvdata(pdev);
	405
b4c3fcb3 VZ	406	sram_free_partitions(sram);
b4c3fcb3 VZ	407
4984c6f5	408	if (gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
665d82fb	409	dev_err(sram->dev, "removed while SRAM allocated\n");
4984c6f5	410
4984c6f5 PZ	411	if (sram->clk)
	412	clk_disable_unprepare(sram->clk);
	413
	414	return 0;
	415	}
	416
4984c6f5 PZ	417	static struct platform_driver sram_driver = {
	418	.driver = {
	419	.name = "sram",
2aa488a6	420	.of_match_table = sram_dt_ids,
4984c6f5 PZ	421	},
	422	.probe = sram_probe,
	423	.remove = sram_remove,
	424	};
	425
	426	static int __init sram_init(void)
	427	{
	428	return platform_driver_register(&sram_driver);
	429	}
	430
	431	postcore_initcall(sram_init);