linux/drivers/misc/sram.c
Thomas Gleixner 1621633323 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1
Based on 2 normalized pattern(s):

  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

  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 [no]_[pad]_[ctrl] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 176 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jilayne Lovejoy <opensource@jilayne.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190519154040.652910950@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21 11:28:39 +02:00

442 lines
10 KiB
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;
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);
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, res);
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);