[linux.git] / drivers / misc / sram.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Generic on-chip SRAM allocation driver
 *
 * Copyright (C) 2012 Philipp Zabel, Pengutronix
 */

#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;
	}
	if (block->protect_exec) {
		ret = sram_check_protect_exec(sram, block, part);
		if (ret)
			return ret;

		ret = sram_add_pool(sram, block, start, part);
		if (ret)
			return ret;

		sram_add_protect_exec(part);
	}

	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 = kcalloc(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 %pOF\n",
				child);
			goto err_chunks;
		}

		if (child_res.start < res->start || child_res.end > res->end) {
			dev_err(sram->dev,
				"reserved block %pOF outside the sram area\n",
				child);
			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 (of_find_property(child, "protect-exec", NULL))
			block->protect_exec = true;

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

			label = NULL;
			ret = of_property_read_string(child, "label", &label);
			if (ret && ret != -EINVAL) {
				dev_err(sram->dev,
					"%pOF has invalid label name\n",
					child);
				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_kcalloc(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->protect_exec) &&
		    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:
	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;
	int ret;
	int (*init_func)(void);

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

	sram->dev = &pdev->dev;

	if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))
		sram->virt_base = devm_platform_ioremap_resource(pdev, 0);
	else
		sram->virt_base = devm_platform_ioremap_resource_wc(pdev, 0);
	if (IS_ERR(sram->virt_base)) {
		dev_err(&pdev->dev, "could not map SRAM registers\n");
		return PTR_ERR(sram->virt_base);
	}

	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);

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

	ret = sram_reserve_regions(sram,
			platform_get_resource(pdev, IORESOURCE_MEM, 0));
	if (ret)
		goto err_disable_clk;

	platform_set_drvdata(pdev, sram);

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

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

	return 0;

err_free_partitions:
	sram_free_partitions(sram);
err_disable_clk:
	if (sram->clk)
		clk_disable_unprepare(sram->clk);

	return ret;
}

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
16216333	1	// SPDX-License-Identifier: GPL-2.0-or-later
4984c6f5 PZ	2	/*
	3	* Generic on-chip SRAM allocation driver
	4	*
	5	* Copyright (C) 2012 Philipp Zabel, Pengutronix
4984c6f5 PZ	6	*/
4984c6f5 PZ	7
4984c6f5	8	#include <linux/clk.h>
2ae2e288	9	#include <linux/delay.h>
98ce2d27	10	#include <linux/genalloc.h>
4984c6f5	11	#include <linux/io.h>
2da19688	12	#include <linux/list_sort.h>
98ce2d27	13	#include <linux/of_address.h>
2ae2e288	14	#include <linux/of_device.h>
4984c6f5	15	#include <linux/platform_device.h>
2ae2e288	16	#include <linux/regmap.h>
4984c6f5	17	#include <linux/slab.h>
2ae2e288 AB	18	#include <linux/mfd/syscon.h>
2ae2e288 AB	19	#include <soc/at91/atmel-secumod.h>
4984c6f5	20
cdd1737c	21	#include "sram.h"
665d82fb	22
cdd1737c	23	#define SRAM_GRANULARITY 32
2da19688	24
b4c3fcb3 VZ	25	static ssize_t sram_read(struct file filp, struct kobject kobj,
	26	struct bin_attribute *attr,
	27	char *buf, loff_t pos, size_t count)
	28	{
	29	struct sram_partition *part;
	30
	31	part = container_of(attr, struct sram_partition, battr);
	32
	33	mutex_lock(&part->lock);
525d12f2	34	memcpy_fromio(buf, part->base + pos, count);
b4c3fcb3 VZ	35	mutex_unlock(&part->lock);
	36
	37	return count;
	38	}
	39
	40	static ssize_t sram_write(struct file filp, struct kobject kobj,
	41	struct bin_attribute *attr,
	42	char *buf, loff_t pos, size_t count)
	43	{
	44	struct sram_partition *part;
	45
	46	part = container_of(attr, struct sram_partition, battr);
	47
	48	mutex_lock(&part->lock);
525d12f2	49	memcpy_toio(part->base + pos, buf, count);
b4c3fcb3 VZ	50	mutex_unlock(&part->lock);
	51
	52	return count;
	53	}
	54
	55	static int sram_add_pool(struct sram_dev sram, struct sram_reserve block,
	56	phys_addr_t start, struct sram_partition *part)
	57	{
	58	int ret;
	59
	60	part->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
	61	NUMA_NO_NODE, block->label);
	62	if (IS_ERR(part->pool))
	63	return PTR_ERR(part->pool);
	64
	65	ret = gen_pool_add_virt(part->pool, (unsigned long)part->base, start,
	66	block->size, NUMA_NO_NODE);
	67	if (ret < 0) {
	68	dev_err(sram->dev, "failed to register subpool: %d\n", ret);
	69	return ret;
	70	}
	71
	72	return 0;
	73	}
	74
	75	static int sram_add_export(struct sram_dev sram, struct sram_reserve block,
	76	phys_addr_t start, struct sram_partition *part)
	77	{
	78	sysfs_bin_attr_init(&part->battr);
	79	part->battr.attr.name = devm_kasprintf(sram->dev, GFP_KERNEL,
	80	"%llx.sram",
	81	(unsigned long long)start);
	82	if (!part->battr.attr.name)
	83	return -ENOMEM;
	84
	85	part->battr.attr.mode = S_IRUSR \| S_IWUSR;
	86	part->battr.read = sram_read;
	87	part->battr.write = sram_write;
	88	part->battr.size = block->size;
	89
	90	return device_create_bin_file(sram->dev, &part->battr);
	91	}
	92
	93	static int sram_add_partition(struct sram_dev sram, struct sram_reserve block,
	94	phys_addr_t start)
	95	{
	96	int ret;
	97	struct sram_partition *part = &sram->partition[sram->partitions];
	98
	99	mutex_init(&part->lock);
	100	part->base = sram->virt_base + block->start;
	101
	102	if (block->pool) {
	103	ret = sram_add_pool(sram, block, start, part);
	104	if (ret)
	105	return ret;
	106	}
	107	if (block->export) {
	108	ret = sram_add_export(sram, block, start, part);
	109	if (ret)
	110	return ret;
	111	}
37afff0d DG	112	if (block->protect_exec) {
	113	ret = sram_check_protect_exec(sram, block, part);
	114	if (ret)
	115	return ret;
	116
	117	ret = sram_add_pool(sram, block, start, part);
	118	if (ret)
	119	return ret;
	120
	121	sram_add_protect_exec(part);
	122	}
	123
b4c3fcb3 VZ	124	sram->partitions++;
	125
	126	return 0;
	127	}
	128
	129	static void sram_free_partitions(struct sram_dev *sram)
	130	{
	131	struct sram_partition *part;
	132
	133	if (!sram->partitions)
	134	return;
	135
	136	part = &sram->partition[sram->partitions - 1];
	137	for (; sram->partitions; sram->partitions--, part--) {
	138	if (part->battr.size)
	139	device_remove_bin_file(sram->dev, &part->battr);
	140
	141	if (part->pool &&
	142	gen_pool_avail(part->pool) < gen_pool_size(part->pool))
	143	dev_err(sram->dev, "removed pool while SRAM allocated\n");
	144	}
	145	}
	146
2da19688 HS	147	static int sram_reserve_cmp(void priv, struct list_head a,
	148	struct list_head *b)
	149	{
	150	struct sram_reserve *ra = list_entry(a, struct sram_reserve, list);
	151	struct sram_reserve *rb = list_entry(b, struct sram_reserve, list);
	152
	153	return ra->start - rb->start;
	154	}
	155
a0a5be0b	156	static int sram_reserve_regions(struct sram_dev sram, struct resource res)
4984c6f5	157	{
a0a5be0b	158	struct device_node np = sram->dev->of_node, child;
2da19688 HS	159	unsigned long size, cur_start, cur_size;
	160	struct sram_reserve rblocks, block;
	161	struct list_head reserve_list;
b4c3fcb3 VZ	162	unsigned int nblocks, exports = 0;
b4c3fcb3 VZ	163	const char *label;
a0a5be0b	164	int ret = 0;
4984c6f5	165
2da19688 HS	166	INIT_LIST_HEAD(&reserve_list);
2da19688 HS	167
f3cbfa5d	168	size = resource_size(res);
4984c6f5	169
2da19688 HS	170	/*
	171	* We need an additional block to mark the end of the memory region
	172	* after the reserved blocks from the dt are processed.
	173	*/
	174	nblocks = (np) ? of_get_available_child_count(np) + 1 : 1;
6396bb22	175	rblocks = kcalloc(nblocks, sizeof(*rblocks), GFP_KERNEL);
ee895ccd VZ	176	if (!rblocks)
ee895ccd VZ	177	return -ENOMEM;
4984c6f5	178
2da19688 HS	179	block = &rblocks[0];
	180	for_each_available_child_of_node(np, child) {
	181	struct resource child_res;
	182
	183	ret = of_address_to_resource(child, 0, &child_res);
	184	if (ret < 0) {
665d82fb	185	dev_err(sram->dev,
34d0eb50 RH	186	"could not get address for node %pOF\n",
34d0eb50 RH	187	child);
2da19688 HS	188	goto err_chunks;
	189	}
	190
	191	if (child_res.start < res->start \|\| child_res.end > res->end) {
665d82fb	192	dev_err(sram->dev,
34d0eb50 RH	193	"reserved block %pOF outside the sram area\n",
34d0eb50 RH	194	child);
2da19688 HS	195	ret = -EINVAL;
	196	goto err_chunks;
	197	}
	198
	199	block->start = child_res.start - res->start;
	200	block->size = resource_size(&child_res);
	201	list_add_tail(&block->list, &reserve_list);
	202
b4c3fcb3 VZ	203	if (of_find_property(child, "export", NULL))
	204	block->export = true;
	205
	206	if (of_find_property(child, "pool", NULL))
	207	block->pool = true;
	208
37afff0d DG	209	if (of_find_property(child, "protect-exec", NULL))
	210	block->protect_exec = true;
	211
	212	if ((block->export \|\| block->pool \|\| block->protect_exec) &&
	213	block->size) {
b4c3fcb3 VZ	214	exports++;
	215
	216	label = NULL;
	217	ret = of_property_read_string(child, "label", &label);
	218	if (ret && ret != -EINVAL) {
	219	dev_err(sram->dev,
34d0eb50 RH	220	"%pOF has invalid label name\n",
34d0eb50 RH	221	child);
b4c3fcb3 VZ	222	goto err_chunks;
	223	}
	224	if (!label)
	225	label = child->name;
	226
	227	block->label = devm_kstrdup(sram->dev,
	228	label, GFP_KERNEL);
ddc5c9a3 PB	229	if (!block->label) {
ddc5c9a3 PB	230	ret = -ENOMEM;
b4c3fcb3	231	goto err_chunks;
ddc5c9a3	232	}
b4c3fcb3 VZ	233
	234	dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",
	235	block->export ? "exported " : "", block->label,
	236	block->start, block->start + block->size);
	237	} else {
	238	dev_dbg(sram->dev, "found reserved block 0x%x-0x%x\n",
	239	block->start, block->start + block->size);
	240	}
2da19688 HS	241
	242	block++;
	243	}
b4c3fcb3	244	child = NULL;
2da19688 HS	245
	246	/* the last chunk marks the end of the region */
	247	rblocks[nblocks - 1].start = size;
	248	rblocks[nblocks - 1].size = 0;
	249	list_add_tail(&rblocks[nblocks - 1].list, &reserve_list);
	250
	251	list_sort(NULL, &reserve_list, sram_reserve_cmp);
	252
b4c3fcb3	253	if (exports) {
a86854d0 KC	254	sram->partition = devm_kcalloc(sram->dev,
a86854d0 KC	255	exports, sizeof(*sram->partition),
b4c3fcb3 VZ	256	GFP_KERNEL);
	257	if (!sram->partition) {
	258	ret = -ENOMEM;
	259	goto err_chunks;
	260	}
	261	}
2da19688	262
b4c3fcb3	263	cur_start = 0;
2da19688 HS	264	list_for_each_entry(block, &reserve_list, list) {
	265	/* can only happen if sections overlap */
	266	if (block->start < cur_start) {
665d82fb	267	dev_err(sram->dev,
2da19688 HS	268	"block at 0x%x starts after current offset 0x%lx\n",
	269	block->start, cur_start);
	270	ret = -EINVAL;
b4c3fcb3	271	sram_free_partitions(sram);
2da19688 HS	272	goto err_chunks;
	273	}
	274
37afff0d DG	275	if ((block->export \|\| block->pool \|\| block->protect_exec) &&
37afff0d DG	276	block->size) {
b4c3fcb3 VZ	277	ret = sram_add_partition(sram, block,
	278	res->start + block->start);
	279	if (ret) {
	280	sram_free_partitions(sram);
	281	goto err_chunks;
	282	}
	283	}
	284
2da19688 HS	285	/* current start is in a reserved block, so continue after it */
	286	if (block->start == cur_start) {
	287	cur_start = block->start + block->size;
	288	continue;
	289	}
	290
	291	/*
	292	* allocate the space between the current starting
	293	* address and the following reserved block, or the
	294	* end of the region.
	295	*/
	296	cur_size = block->start - cur_start;
	297
665d82fb	298	dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",
2da19688	299	cur_start, cur_start + cur_size);
665d82fb	300
2da19688	301	ret = gen_pool_add_virt(sram->pool,
665d82fb	302	(unsigned long)sram->virt_base + cur_start,
2da19688	303	res->start + cur_start, cur_size, -1);
b4c3fcb3 VZ	304	if (ret < 0) {
b4c3fcb3 VZ	305	sram_free_partitions(sram);
2da19688	306	goto err_chunks;
b4c3fcb3	307	}
2da19688 HS	308
	309	/* next allocation after this reserved block */
	310	cur_start = block->start + block->size;
	311	}
	312
3104389e	313	err_chunks:
3104389e	314	of_node_put(child);
2da19688 HS	315	kfree(rblocks);
2da19688 HS	316
a0a5be0b VZ	317	return ret;
	318	}
	319
2ae2e288 AB	320	static int atmel_securam_wait(void)
	321	{
	322	struct regmap *regmap;
	323	u32 val;
	324
	325	regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-secumod");
	326	if (IS_ERR(regmap))
	327	return -ENODEV;
	328
	329	return regmap_read_poll_timeout(regmap, AT91_SECUMOD_RAMRDY, val,
	330	val & AT91_SECUMOD_RAMRDY_READY,
	331	10000, 500000);
	332	}
	333
2ae2e288 AB	334	static const struct of_device_id sram_dt_ids[] = {
	335	{ .compatible = "mmio-sram" },
	336	{ .compatible = "atmel,sama5d2-securam", .data = atmel_securam_wait },
	337	{}
	338	};
2ae2e288	339
a0a5be0b VZ	340	static int sram_probe(struct platform_device *pdev)
	341	{
	342	struct sram_dev *sram;
a0a5be0b	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
eb43e023	352	if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))
444b0111	353	sram->virt_base = devm_platform_ioremap_resource(pdev, 0);
eb43e023	354	else
444b0111 BG	355	sram->virt_base = devm_platform_ioremap_resource_wc(pdev, 0);
	356	if (IS_ERR(sram->virt_base)) {
	357	dev_err(&pdev->dev, "could not map SRAM registers\n");
	358	return PTR_ERR(sram->virt_base);
	359	}
a0a5be0b	360
73858173 VZ	361	sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
	362	NUMA_NO_NODE, NULL);
	363	if (IS_ERR(sram->pool))
	364	return PTR_ERR(sram->pool);
a0a5be0b	365
665d82fb	366	sram->clk = devm_clk_get(sram->dev, NULL);
ee895ccd VZ	367	if (IS_ERR(sram->clk))
	368	sram->clk = NULL;
	369	else
	370	clk_prepare_enable(sram->clk);
	371
444b0111 BG	372	ret = sram_reserve_regions(sram,
444b0111 BG	373	platform_get_resource(pdev, IORESOURCE_MEM, 0));
d5b9653d JH	374	if (ret)
	375	goto err_disable_clk;
	376
4984c6f5 PZ	377	platform_set_drvdata(pdev, sram);
4984c6f5 PZ	378
2ae2e288 AB	379	init_func = of_device_get_match_data(&pdev->dev);
	380	if (init_func) {
	381	ret = init_func();
	382	if (ret)
d5b9653d	383	goto err_free_partitions;
2ae2e288 AB	384	}
2ae2e288 AB	385
665d82fb VZ	386	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
665d82fb VZ	387	gen_pool_size(sram->pool) / 1024, sram->virt_base);
4984c6f5 PZ	388
4984c6f5 PZ	389	return 0;
f294d009	390
d5b9653d JH	391	err_free_partitions:
d5b9653d JH	392	sram_free_partitions(sram);
f294d009 JH	393	err_disable_clk:
	394	if (sram->clk)
	395	clk_disable_unprepare(sram->clk);
f294d009 JH	396
f294d009 JH	397	return ret;
4984c6f5 PZ	398	}
	399
	400	static int sram_remove(struct platform_device *pdev)
	401	{
	402	struct sram_dev *sram = platform_get_drvdata(pdev);
	403
b4c3fcb3 VZ	404	sram_free_partitions(sram);
b4c3fcb3 VZ	405
4984c6f5	406	if (gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
665d82fb	407	dev_err(sram->dev, "removed while SRAM allocated\n");
4984c6f5	408
4984c6f5 PZ	409	if (sram->clk)
	410	clk_disable_unprepare(sram->clk);
	411
	412	return 0;
	413	}
	414
4984c6f5 PZ	415	static struct platform_driver sram_driver = {
	416	.driver = {
	417	.name = "sram",
2aa488a6	418	.of_match_table = sram_dt_ids,
4984c6f5 PZ	419	},
	420	.probe = sram_probe,
	421	.remove = sram_remove,
	422	};
	423
	424	static int __init sram_init(void)
	425	{
	426	return platform_driver_register(&sram_driver);
	427	}
	428
	429	postcore_initcall(sram_init);