[mirror_ubuntu-jammy-kernel.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);

	if (sram->config && sram->config->map_only_reserved) {
		void __iomem *virt_base;

		if (sram->no_memory_wc)
			virt_base = devm_ioremap_resource(sram->dev, &block->res);
		else
			virt_base = devm_ioremap_resource_wc(sram->dev, &block->res);

		if (IS_ERR(virt_base)) {
			dev_err(sram->dev, "could not map SRAM at %pr\n", &block->res);
			return PTR_ERR(virt_base);
		}

		part->base = virt_base;
	} else {
		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, const struct list_head *a,
					const 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);
		block->res = 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;

		if (sram->pool) {
			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 sram_config atmel_securam_config = {
	.init = atmel_securam_wait,
};

/*
 * SYSRAM contains areas that are not accessible by the
 * kernel, such as the first 256K that is reserved for TZ.
 * Accesses to those areas (including speculative accesses)
 * trigger SErrors. As such we must map only the areas of
 * SYSRAM specified in the device tree.
 */
static const struct sram_config tegra_sysram_config = {
	.map_only_reserved = true,
};

static const struct of_device_id sram_dt_ids[] = {
	{ .compatible = "mmio-sram" },
	{ .compatible = "atmel,sama5d2-securam", .data = &atmel_securam_config },
	{ .compatible = "nvidia,tegra186-sysram", .data = &tegra_sysram_config },
	{ .compatible = "nvidia,tegra194-sysram", .data = &tegra_sysram_config },
	{}
};

static int sram_probe(struct platform_device *pdev)
{
	const struct sram_config *config;
	struct sram_dev *sram;
	int ret;
	struct resource *res;

	config = of_device_get_match_data(&pdev->dev);

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

	sram->dev = &pdev->dev;
	sram->no_memory_wc = of_property_read_bool(pdev->dev.of_node, "no-memory-wc");
	sram->config = config;

	if (!config || !config->map_only_reserved) {
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (sram->no_memory_wc)
			sram->virt_base = devm_ioremap_resource(&pdev->dev, res);
		else
			sram->virt_base = devm_ioremap_resource_wc(&pdev->dev, res);
		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);

	if (config && config->init) {
		ret = config->init();
		if (ret)
			goto err_free_partitions;
	}

	if (sram->pool)
		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 (sram->pool && 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);
fec29bf0 MP	100
	101	if (sram->config && sram->config->map_only_reserved) {
	102	void __iomem *virt_base;
	103
	104	if (sram->no_memory_wc)
	105	virt_base = devm_ioremap_resource(sram->dev, &block->res);
	106	else
	107	virt_base = devm_ioremap_resource_wc(sram->dev, &block->res);
	108
	109	if (IS_ERR(virt_base)) {
	110	dev_err(sram->dev, "could not map SRAM at %pr\n", &block->res);
	111	return PTR_ERR(virt_base);
	112	}
	113
	114	part->base = virt_base;
	115	} else {
	116	part->base = sram->virt_base + block->start;
	117	}
b4c3fcb3 VZ	118
	119	if (block->pool) {
	120	ret = sram_add_pool(sram, block, start, part);
	121	if (ret)
	122	return ret;
	123	}
	124	if (block->export) {
	125	ret = sram_add_export(sram, block, start, part);
	126	if (ret)
	127	return ret;
	128	}
37afff0d DG	129	if (block->protect_exec) {
	130	ret = sram_check_protect_exec(sram, block, part);
	131	if (ret)
	132	return ret;
	133
	134	ret = sram_add_pool(sram, block, start, part);
	135	if (ret)
	136	return ret;
	137
	138	sram_add_protect_exec(part);
	139	}
	140
b4c3fcb3 VZ	141	sram->partitions++;
	142
	143	return 0;
	144	}
	145
	146	static void sram_free_partitions(struct sram_dev *sram)
	147	{
	148	struct sram_partition *part;
	149
	150	if (!sram->partitions)
	151	return;
	152
	153	part = &sram->partition[sram->partitions - 1];
	154	for (; sram->partitions; sram->partitions--, part--) {
	155	if (part->battr.size)
	156	device_remove_bin_file(sram->dev, &part->battr);
	157
	158	if (part->pool &&
	159	gen_pool_avail(part->pool) < gen_pool_size(part->pool))
	160	dev_err(sram->dev, "removed pool while SRAM allocated\n");
	161	}
	162	}
	163
4f0f586b ST	164	static int sram_reserve_cmp(void priv, const struct list_head a,
4f0f586b ST	165	const struct list_head *b)
2da19688 HS	166	{
	167	struct sram_reserve *ra = list_entry(a, struct sram_reserve, list);
	168	struct sram_reserve *rb = list_entry(b, struct sram_reserve, list);
	169
	170	return ra->start - rb->start;
	171	}
	172
a0a5be0b	173	static int sram_reserve_regions(struct sram_dev sram, struct resource res)
4984c6f5	174	{
a0a5be0b	175	struct device_node np = sram->dev->of_node, child;
2da19688 HS	176	unsigned long size, cur_start, cur_size;
	177	struct sram_reserve rblocks, block;
	178	struct list_head reserve_list;
b4c3fcb3 VZ	179	unsigned int nblocks, exports = 0;
b4c3fcb3 VZ	180	const char *label;
a0a5be0b	181	int ret = 0;
4984c6f5	182
2da19688 HS	183	INIT_LIST_HEAD(&reserve_list);
2da19688 HS	184
f3cbfa5d	185	size = resource_size(res);
4984c6f5	186
2da19688 HS	187	/*
	188	* We need an additional block to mark the end of the memory region
	189	* after the reserved blocks from the dt are processed.
	190	*/
	191	nblocks = (np) ? of_get_available_child_count(np) + 1 : 1;
6396bb22	192	rblocks = kcalloc(nblocks, sizeof(*rblocks), GFP_KERNEL);
ee895ccd VZ	193	if (!rblocks)
ee895ccd VZ	194	return -ENOMEM;
4984c6f5	195
2da19688 HS	196	block = &rblocks[0];
	197	for_each_available_child_of_node(np, child) {
	198	struct resource child_res;
	199
	200	ret = of_address_to_resource(child, 0, &child_res);
	201	if (ret < 0) {
665d82fb	202	dev_err(sram->dev,
34d0eb50 RH	203	"could not get address for node %pOF\n",
34d0eb50 RH	204	child);
2da19688 HS	205	goto err_chunks;
	206	}
	207
	208	if (child_res.start < res->start \|\| child_res.end > res->end) {
665d82fb	209	dev_err(sram->dev,
34d0eb50 RH	210	"reserved block %pOF outside the sram area\n",
34d0eb50 RH	211	child);
2da19688 HS	212	ret = -EINVAL;
	213	goto err_chunks;
	214	}
	215
	216	block->start = child_res.start - res->start;
	217	block->size = resource_size(&child_res);
fec29bf0	218	block->res = child_res;
2da19688 HS	219	list_add_tail(&block->list, &reserve_list);
2da19688 HS	220
b4c3fcb3 VZ	221	if (of_find_property(child, "export", NULL))
	222	block->export = true;
	223
	224	if (of_find_property(child, "pool", NULL))
	225	block->pool = true;
	226
37afff0d DG	227	if (of_find_property(child, "protect-exec", NULL))
	228	block->protect_exec = true;
	229
	230	if ((block->export \|\| block->pool \|\| block->protect_exec) &&
	231	block->size) {
b4c3fcb3 VZ	232	exports++;
	233
	234	label = NULL;
	235	ret = of_property_read_string(child, "label", &label);
	236	if (ret && ret != -EINVAL) {
	237	dev_err(sram->dev,
34d0eb50 RH	238	"%pOF has invalid label name\n",
34d0eb50 RH	239	child);
b4c3fcb3 VZ	240	goto err_chunks;
	241	}
	242	if (!label)
	243	label = child->name;
	244
	245	block->label = devm_kstrdup(sram->dev,
	246	label, GFP_KERNEL);
ddc5c9a3 PB	247	if (!block->label) {
ddc5c9a3 PB	248	ret = -ENOMEM;
b4c3fcb3	249	goto err_chunks;
ddc5c9a3	250	}
b4c3fcb3 VZ	251
	252	dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",
	253	block->export ? "exported " : "", block->label,
	254	block->start, block->start + block->size);
	255	} else {
	256	dev_dbg(sram->dev, "found reserved block 0x%x-0x%x\n",
	257	block->start, block->start + block->size);
	258	}
2da19688 HS	259
	260	block++;
	261	}
b4c3fcb3	262	child = NULL;
2da19688 HS	263
	264	/* the last chunk marks the end of the region */
	265	rblocks[nblocks - 1].start = size;
	266	rblocks[nblocks - 1].size = 0;
	267	list_add_tail(&rblocks[nblocks - 1].list, &reserve_list);
	268
	269	list_sort(NULL, &reserve_list, sram_reserve_cmp);
	270
b4c3fcb3	271	if (exports) {
a86854d0 KC	272	sram->partition = devm_kcalloc(sram->dev,
a86854d0 KC	273	exports, sizeof(*sram->partition),
b4c3fcb3 VZ	274	GFP_KERNEL);
	275	if (!sram->partition) {
	276	ret = -ENOMEM;
	277	goto err_chunks;
	278	}
	279	}
2da19688	280
b4c3fcb3	281	cur_start = 0;
2da19688 HS	282	list_for_each_entry(block, &reserve_list, list) {
	283	/* can only happen if sections overlap */
	284	if (block->start < cur_start) {
665d82fb	285	dev_err(sram->dev,
2da19688 HS	286	"block at 0x%x starts after current offset 0x%lx\n",
	287	block->start, cur_start);
	288	ret = -EINVAL;
b4c3fcb3	289	sram_free_partitions(sram);
2da19688 HS	290	goto err_chunks;
	291	}
	292
37afff0d DG	293	if ((block->export \|\| block->pool \|\| block->protect_exec) &&
37afff0d DG	294	block->size) {
b4c3fcb3 VZ	295	ret = sram_add_partition(sram, block,
	296	res->start + block->start);
	297	if (ret) {
	298	sram_free_partitions(sram);
	299	goto err_chunks;
	300	}
	301	}
	302
2da19688 HS	303	/* current start is in a reserved block, so continue after it */
	304	if (block->start == cur_start) {
	305	cur_start = block->start + block->size;
	306	continue;
	307	}
	308
	309	/*
	310	* allocate the space between the current starting
	311	* address and the following reserved block, or the
	312	* end of the region.
	313	*/
	314	cur_size = block->start - cur_start;
	315
fec29bf0 MP	316	if (sram->pool) {
	317	dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",
	318	cur_start, cur_start + cur_size);
665d82fb	319
fec29bf0 MP	320	ret = gen_pool_add_virt(sram->pool,
	321	(unsigned long)sram->virt_base + cur_start,
	322	res->start + cur_start, cur_size, -1);
	323	if (ret < 0) {
	324	sram_free_partitions(sram);
	325	goto err_chunks;
	326	}
b4c3fcb3	327	}
2da19688 HS	328
	329	/* next allocation after this reserved block */
	330	cur_start = block->start + block->size;
	331	}
	332
3104389e	333	err_chunks:
3104389e	334	of_node_put(child);
2da19688 HS	335	kfree(rblocks);
2da19688 HS	336
a0a5be0b VZ	337	return ret;
	338	}
	339
2ae2e288 AB	340	static int atmel_securam_wait(void)
	341	{
	342	struct regmap *regmap;
	343	u32 val;
	344
	345	regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-secumod");
	346	if (IS_ERR(regmap))
	347	return -ENODEV;
	348
	349	return regmap_read_poll_timeout(regmap, AT91_SECUMOD_RAMRDY, val,
	350	val & AT91_SECUMOD_RAMRDY_READY,
	351	10000, 500000);
	352	}
	353
fec29bf0 MP	354	static const struct sram_config atmel_securam_config = {
	355	.init = atmel_securam_wait,
	356	};
	357
	358	/*
	359	* SYSRAM contains areas that are not accessible by the
	360	* kernel, such as the first 256K that is reserved for TZ.
	361	* Accesses to those areas (including speculative accesses)
	362	* trigger SErrors. As such we must map only the areas of
	363	* SYSRAM specified in the device tree.
	364	*/
	365	static const struct sram_config tegra_sysram_config = {
	366	.map_only_reserved = true,
	367	};
	368
2ae2e288 AB	369	static const struct of_device_id sram_dt_ids[] = {
2ae2e288 AB	370	{ .compatible = "mmio-sram" },
fec29bf0 MP	371	{ .compatible = "atmel,sama5d2-securam", .data = &atmel_securam_config },
	372	{ .compatible = "nvidia,tegra186-sysram", .data = &tegra_sysram_config },
	373	{ .compatible = "nvidia,tegra194-sysram", .data = &tegra_sysram_config },
2ae2e288 AB	374	{}
2ae2e288 AB	375	};
2ae2e288	376
a0a5be0b VZ	377	static int sram_probe(struct platform_device *pdev)
a0a5be0b VZ	378	{
fec29bf0	379	const struct sram_config *config;
a0a5be0b	380	struct sram_dev *sram;
a0a5be0b	381	int ret;
39b27e89	382	struct resource *res;
fec29bf0 MP	383
fec29bf0 MP	384	config = of_device_get_match_data(&pdev->dev);
a0a5be0b VZ	385
	386	sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);
	387	if (!sram)
	388	return -ENOMEM;
	389
	390	sram->dev = &pdev->dev;
fec29bf0 MP	391	sram->no_memory_wc = of_property_read_bool(pdev->dev.of_node, "no-memory-wc");
	392	sram->config = config;
	393
	394	if (!config \|\| !config->map_only_reserved) {
	395	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	396	if (sram->no_memory_wc)
	397	sram->virt_base = devm_ioremap_resource(&pdev->dev, res);
	398	else
	399	sram->virt_base = devm_ioremap_resource_wc(&pdev->dev, res);
	400	if (IS_ERR(sram->virt_base)) {
	401	dev_err(&pdev->dev, "could not map SRAM registers\n");
	402	return PTR_ERR(sram->virt_base);
	403	}
a0a5be0b	404
fec29bf0 MP	405	sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
	406	NUMA_NO_NODE, NULL);
	407	if (IS_ERR(sram->pool))
	408	return PTR_ERR(sram->pool);
444b0111	409	}
a0a5be0b	410
665d82fb	411	sram->clk = devm_clk_get(sram->dev, NULL);
ee895ccd VZ	412	if (IS_ERR(sram->clk))
	413	sram->clk = NULL;
	414	else
	415	clk_prepare_enable(sram->clk);
	416
444b0111 BG	417	ret = sram_reserve_regions(sram,
444b0111 BG	418	platform_get_resource(pdev, IORESOURCE_MEM, 0));
d5b9653d JH	419	if (ret)
	420	goto err_disable_clk;
	421
4984c6f5 PZ	422	platform_set_drvdata(pdev, sram);
4984c6f5 PZ	423
fec29bf0 MP	424	if (config && config->init) {
fec29bf0 MP	425	ret = config->init();
2ae2e288	426	if (ret)
d5b9653d	427	goto err_free_partitions;
2ae2e288 AB	428	}
2ae2e288 AB	429
fec29bf0 MP	430	if (sram->pool)
	431	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
	432	gen_pool_size(sram->pool) / 1024, sram->virt_base);
4984c6f5 PZ	433
4984c6f5 PZ	434	return 0;
f294d009	435
d5b9653d JH	436	err_free_partitions:
d5b9653d JH	437	sram_free_partitions(sram);
f294d009 JH	438	err_disable_clk:
	439	if (sram->clk)
	440	clk_disable_unprepare(sram->clk);
f294d009 JH	441
f294d009 JH	442	return ret;
4984c6f5 PZ	443	}
	444
	445	static int sram_remove(struct platform_device *pdev)
	446	{
	447	struct sram_dev *sram = platform_get_drvdata(pdev);
	448
b4c3fcb3 VZ	449	sram_free_partitions(sram);
b4c3fcb3 VZ	450
fec29bf0	451	if (sram->pool && gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
665d82fb	452	dev_err(sram->dev, "removed while SRAM allocated\n");
4984c6f5	453
4984c6f5 PZ	454	if (sram->clk)
	455	clk_disable_unprepare(sram->clk);
	456
	457	return 0;
	458	}
	459
4984c6f5 PZ	460	static struct platform_driver sram_driver = {
	461	.driver = {
	462	.name = "sram",
2aa488a6	463	.of_match_table = sram_dt_ids,
4984c6f5 PZ	464	},
	465	.probe = sram_probe,
	466	.remove = sram_remove,
	467	};
	468
	469	static int __init sram_init(void)
	470	{
	471	return platform_driver_register(&sram_driver);
	472	}
	473
	474	postcore_initcall(sram_init);