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d9c58aeb40
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Acked-by: Andrew Donnellan <ajd@linux.ibm.com> # cxl Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230718143102.1065481-1-robh@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
465 lines
11 KiB
C
465 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Generic on-chip SRAM allocation driver
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*
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* Copyright (C) 2012 Philipp Zabel, Pengutronix
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/genalloc.h>
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#include <linux/io.h>
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#include <linux/list_sort.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/mfd/syscon.h>
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#include <soc/at91/atmel-secumod.h>
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#include "sram.h"
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#define SRAM_GRANULARITY 32
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static ssize_t sram_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr,
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char *buf, loff_t pos, size_t count)
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{
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struct sram_partition *part;
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part = container_of(attr, struct sram_partition, battr);
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mutex_lock(&part->lock);
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memcpy_fromio(buf, part->base + pos, count);
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mutex_unlock(&part->lock);
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return count;
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}
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static ssize_t sram_write(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr,
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char *buf, loff_t pos, size_t count)
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{
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struct sram_partition *part;
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part = container_of(attr, struct sram_partition, battr);
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mutex_lock(&part->lock);
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memcpy_toio(part->base + pos, buf, count);
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mutex_unlock(&part->lock);
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return count;
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}
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static int sram_add_pool(struct sram_dev *sram, struct sram_reserve *block,
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phys_addr_t start, struct sram_partition *part)
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{
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int ret;
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part->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
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NUMA_NO_NODE, block->label);
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if (IS_ERR(part->pool))
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return PTR_ERR(part->pool);
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ret = gen_pool_add_virt(part->pool, (unsigned long)part->base, start,
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block->size, NUMA_NO_NODE);
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if (ret < 0) {
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dev_err(sram->dev, "failed to register subpool: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int sram_add_export(struct sram_dev *sram, struct sram_reserve *block,
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phys_addr_t start, struct sram_partition *part)
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{
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sysfs_bin_attr_init(&part->battr);
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part->battr.attr.name = devm_kasprintf(sram->dev, GFP_KERNEL,
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"%llx.sram",
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(unsigned long long)start);
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if (!part->battr.attr.name)
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return -ENOMEM;
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part->battr.attr.mode = S_IRUSR | S_IWUSR;
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part->battr.read = sram_read;
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part->battr.write = sram_write;
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part->battr.size = block->size;
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return device_create_bin_file(sram->dev, &part->battr);
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}
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static int sram_add_partition(struct sram_dev *sram, struct sram_reserve *block,
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phys_addr_t start)
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{
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int ret;
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struct sram_partition *part = &sram->partition[sram->partitions];
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mutex_init(&part->lock);
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if (sram->config && sram->config->map_only_reserved) {
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void __iomem *virt_base;
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if (sram->no_memory_wc)
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virt_base = devm_ioremap_resource(sram->dev, &block->res);
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else
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virt_base = devm_ioremap_resource_wc(sram->dev, &block->res);
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if (IS_ERR(virt_base)) {
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dev_err(sram->dev, "could not map SRAM at %pr\n", &block->res);
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return PTR_ERR(virt_base);
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}
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part->base = virt_base;
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} else {
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part->base = sram->virt_base + block->start;
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}
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if (block->pool) {
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ret = sram_add_pool(sram, block, start, part);
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if (ret)
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return ret;
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}
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if (block->export) {
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ret = sram_add_export(sram, block, start, part);
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if (ret)
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return ret;
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}
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if (block->protect_exec) {
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ret = sram_check_protect_exec(sram, block, part);
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if (ret)
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return ret;
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ret = sram_add_pool(sram, block, start, part);
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if (ret)
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return ret;
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sram_add_protect_exec(part);
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}
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sram->partitions++;
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return 0;
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}
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static void sram_free_partitions(struct sram_dev *sram)
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{
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struct sram_partition *part;
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if (!sram->partitions)
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return;
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part = &sram->partition[sram->partitions - 1];
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for (; sram->partitions; sram->partitions--, part--) {
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if (part->battr.size)
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device_remove_bin_file(sram->dev, &part->battr);
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if (part->pool &&
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gen_pool_avail(part->pool) < gen_pool_size(part->pool))
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dev_err(sram->dev, "removed pool while SRAM allocated\n");
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}
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}
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static int sram_reserve_cmp(void *priv, const struct list_head *a,
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const struct list_head *b)
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{
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struct sram_reserve *ra = list_entry(a, struct sram_reserve, list);
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struct sram_reserve *rb = list_entry(b, struct sram_reserve, list);
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return ra->start - rb->start;
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}
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static int sram_reserve_regions(struct sram_dev *sram, struct resource *res)
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{
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struct device_node *np = sram->dev->of_node, *child;
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unsigned long size, cur_start, cur_size;
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struct sram_reserve *rblocks, *block;
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struct list_head reserve_list;
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unsigned int nblocks, exports = 0;
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const char *label;
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int ret = 0;
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INIT_LIST_HEAD(&reserve_list);
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size = resource_size(res);
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/*
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* We need an additional block to mark the end of the memory region
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* after the reserved blocks from the dt are processed.
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*/
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nblocks = (np) ? of_get_available_child_count(np) + 1 : 1;
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rblocks = kcalloc(nblocks, sizeof(*rblocks), GFP_KERNEL);
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if (!rblocks)
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return -ENOMEM;
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block = &rblocks[0];
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for_each_available_child_of_node(np, child) {
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struct resource child_res;
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ret = of_address_to_resource(child, 0, &child_res);
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if (ret < 0) {
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dev_err(sram->dev,
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"could not get address for node %pOF\n",
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child);
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goto err_chunks;
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}
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if (child_res.start < res->start || child_res.end > res->end) {
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dev_err(sram->dev,
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"reserved block %pOF outside the sram area\n",
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child);
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ret = -EINVAL;
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goto err_chunks;
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}
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block->start = child_res.start - res->start;
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block->size = resource_size(&child_res);
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block->res = child_res;
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list_add_tail(&block->list, &reserve_list);
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block->export = of_property_read_bool(child, "export");
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block->pool = of_property_read_bool(child, "pool");
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block->protect_exec = of_property_read_bool(child, "protect-exec");
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if ((block->export || block->pool || block->protect_exec) &&
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block->size) {
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exports++;
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label = NULL;
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ret = of_property_read_string(child, "label", &label);
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if (ret && ret != -EINVAL) {
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dev_err(sram->dev,
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"%pOF has invalid label name\n",
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child);
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goto err_chunks;
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}
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if (!label)
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block->label = devm_kasprintf(sram->dev, GFP_KERNEL,
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"%s", of_node_full_name(child));
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else
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block->label = devm_kstrdup(sram->dev,
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label, GFP_KERNEL);
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if (!block->label) {
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ret = -ENOMEM;
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goto err_chunks;
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}
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dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",
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block->export ? "exported " : "", block->label,
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block->start, block->start + block->size);
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} else {
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dev_dbg(sram->dev, "found reserved block 0x%x-0x%x\n",
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block->start, block->start + block->size);
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}
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block++;
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}
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child = NULL;
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/* the last chunk marks the end of the region */
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rblocks[nblocks - 1].start = size;
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rblocks[nblocks - 1].size = 0;
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list_add_tail(&rblocks[nblocks - 1].list, &reserve_list);
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list_sort(NULL, &reserve_list, sram_reserve_cmp);
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if (exports) {
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sram->partition = devm_kcalloc(sram->dev,
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exports, sizeof(*sram->partition),
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GFP_KERNEL);
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if (!sram->partition) {
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ret = -ENOMEM;
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goto err_chunks;
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}
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}
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cur_start = 0;
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list_for_each_entry(block, &reserve_list, list) {
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/* can only happen if sections overlap */
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if (block->start < cur_start) {
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dev_err(sram->dev,
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"block at 0x%x starts after current offset 0x%lx\n",
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block->start, cur_start);
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ret = -EINVAL;
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sram_free_partitions(sram);
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goto err_chunks;
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}
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if ((block->export || block->pool || block->protect_exec) &&
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block->size) {
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ret = sram_add_partition(sram, block,
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res->start + block->start);
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if (ret) {
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sram_free_partitions(sram);
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goto err_chunks;
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}
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}
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/* current start is in a reserved block, so continue after it */
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if (block->start == cur_start) {
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cur_start = block->start + block->size;
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continue;
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}
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/*
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* allocate the space between the current starting
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* address and the following reserved block, or the
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* end of the region.
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*/
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cur_size = block->start - cur_start;
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if (sram->pool) {
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dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",
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cur_start, cur_start + cur_size);
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ret = gen_pool_add_virt(sram->pool,
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(unsigned long)sram->virt_base + cur_start,
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res->start + cur_start, cur_size, -1);
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if (ret < 0) {
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sram_free_partitions(sram);
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goto err_chunks;
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}
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}
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/* next allocation after this reserved block */
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cur_start = block->start + block->size;
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}
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err_chunks:
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of_node_put(child);
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kfree(rblocks);
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return ret;
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}
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static int atmel_securam_wait(void)
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{
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struct regmap *regmap;
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u32 val;
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regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-secumod");
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if (IS_ERR(regmap))
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return -ENODEV;
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return regmap_read_poll_timeout(regmap, AT91_SECUMOD_RAMRDY, val,
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val & AT91_SECUMOD_RAMRDY_READY,
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10000, 500000);
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}
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static const struct sram_config atmel_securam_config = {
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.init = atmel_securam_wait,
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};
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/*
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* SYSRAM contains areas that are not accessible by the
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* kernel, such as the first 256K that is reserved for TZ.
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* Accesses to those areas (including speculative accesses)
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* trigger SErrors. As such we must map only the areas of
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* SYSRAM specified in the device tree.
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*/
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static const struct sram_config tegra_sysram_config = {
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.map_only_reserved = true,
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};
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static const struct of_device_id sram_dt_ids[] = {
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{ .compatible = "mmio-sram" },
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{ .compatible = "atmel,sama5d2-securam", .data = &atmel_securam_config },
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{ .compatible = "nvidia,tegra186-sysram", .data = &tegra_sysram_config },
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{ .compatible = "nvidia,tegra194-sysram", .data = &tegra_sysram_config },
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{ .compatible = "nvidia,tegra234-sysram", .data = &tegra_sysram_config },
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{}
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};
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static int sram_probe(struct platform_device *pdev)
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{
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const struct sram_config *config;
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struct sram_dev *sram;
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int ret;
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struct resource *res;
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struct clk *clk;
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config = of_device_get_match_data(&pdev->dev);
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sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);
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if (!sram)
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return -ENOMEM;
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sram->dev = &pdev->dev;
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sram->no_memory_wc = of_property_read_bool(pdev->dev.of_node, "no-memory-wc");
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sram->config = config;
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if (!config || !config->map_only_reserved) {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (sram->no_memory_wc)
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sram->virt_base = devm_ioremap_resource(&pdev->dev, res);
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else
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sram->virt_base = devm_ioremap_resource_wc(&pdev->dev, res);
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if (IS_ERR(sram->virt_base)) {
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dev_err(&pdev->dev, "could not map SRAM registers\n");
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return PTR_ERR(sram->virt_base);
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}
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sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
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NUMA_NO_NODE, NULL);
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if (IS_ERR(sram->pool))
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return PTR_ERR(sram->pool);
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}
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clk = devm_clk_get_optional_enabled(sram->dev, NULL);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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ret = sram_reserve_regions(sram,
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platform_get_resource(pdev, IORESOURCE_MEM, 0));
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if (ret)
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return ret;
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platform_set_drvdata(pdev, sram);
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if (config && config->init) {
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ret = config->init();
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if (ret)
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goto err_free_partitions;
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}
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if (sram->pool)
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dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
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gen_pool_size(sram->pool) / 1024, sram->virt_base);
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return 0;
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err_free_partitions:
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sram_free_partitions(sram);
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return ret;
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}
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static int sram_remove(struct platform_device *pdev)
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{
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struct sram_dev *sram = platform_get_drvdata(pdev);
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sram_free_partitions(sram);
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if (sram->pool && gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
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dev_err(sram->dev, "removed while SRAM allocated\n");
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return 0;
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}
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static struct platform_driver sram_driver = {
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.driver = {
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.name = "sram",
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.of_match_table = sram_dt_ids,
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},
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.probe = sram_probe,
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.remove = sram_remove,
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};
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static int __init sram_init(void)
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{
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return platform_driver_register(&sram_driver);
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}
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postcore_initcall(sram_init);
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