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429 lines
10 KiB
429 lines
10 KiB
// 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_address.h> |
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#include <linux/of_device.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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part->base = sram->virt_base + block->start; |
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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, struct list_head *a, |
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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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list_add_tail(&block->list, &reserve_list); |
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if (of_find_property(child, "export", NULL)) |
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block->export = true; |
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if (of_find_property(child, "pool", NULL)) |
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block->pool = true; |
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if (of_find_property(child, "protect-exec", NULL)) |
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block->protect_exec = true; |
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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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label = child->name; |
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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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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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/* 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 of_device_id sram_dt_ids[] = { |
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{ .compatible = "mmio-sram" }, |
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{ .compatible = "atmel,sama5d2-securam", .data = atmel_securam_wait }, |
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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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struct sram_dev *sram; |
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int ret; |
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int (*init_func)(void); |
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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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if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc")) |
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sram->virt_base = devm_platform_ioremap_resource(pdev, 0); |
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else |
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sram->virt_base = devm_platform_ioremap_resource_wc(pdev, 0); |
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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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sram->clk = devm_clk_get(sram->dev, NULL); |
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if (IS_ERR(sram->clk)) |
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sram->clk = NULL; |
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else |
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clk_prepare_enable(sram->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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goto err_disable_clk; |
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platform_set_drvdata(pdev, sram); |
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init_func = of_device_get_match_data(&pdev->dev); |
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if (init_func) { |
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ret = init_func(); |
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if (ret) |
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goto err_free_partitions; |
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} |
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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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err_disable_clk: |
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if (sram->clk) |
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clk_disable_unprepare(sram->clk); |
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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 (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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if (sram->clk) |
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clk_disable_unprepare(sram->clk); |
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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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