diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 93638ae2753afb81cbad8f6ca0ef3c096e44cdf1..4c26b19f5154ace7e6d0c88f0b5075fdb56ac9d4 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -97,7 +97,24 @@ static int sram_add_partition(struct sram_dev *sram, struct sram_reserve *block,
struct sram_partition *part = &sram->partition[sram->partitions];
mutex_init(&part->lock);
- part->base = sram->virt_base + block->start;
+
+ 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);
@@ -198,6 +215,7 @@ static int sram_reserve_regions(struct sram_dev *sram, struct resource *res)
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))
@@ -295,15 +313,17 @@ static int sram_reserve_regions(struct sram_dev *sram, struct resource *res)
*/
cur_size = block->start - cur_start;
- dev_dbg(sram->dev, "adding chunk 0x%lx-0x%lx\n",
- cur_start, cur_start + cur_size);
+ 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;
+ 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 */
@@ -331,40 +351,63 @@ static int atmel_securam_wait(void)
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_wait },
+ { .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;
- int (*init_func)(void);
+
+ 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);
+ }
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (of_property_read_bool(pdev->dev.of_node, "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->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;
@@ -378,15 +421,15 @@ static int sram_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, sram);
- init_func = of_device_get_match_data(&pdev->dev);
- if (init_func) {
- ret = init_func();
+ if (config && config->init) {
+ ret = config->init();
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);
+ 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;
@@ -405,7 +448,7 @@ static int sram_remove(struct platform_device *pdev)
sram_free_partitions(sram);
- if (gen_pool_avail(sram->pool) < gen_pool_size(sram->pool))
+ 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)
diff --git a/drivers/misc/sram.h b/drivers/misc/sram.h
index 9c1d21ff73476c2b02b4468d65c6b6b32a50be77..d2058d8c8f1d2116f973ca95a85397b17dd01e19 100644
--- a/drivers/misc/sram.h
+++ b/drivers/misc/sram.h
@@ -5,6 +5,11 @@
#ifndef __SRAM_H
#define __SRAM_H
+struct sram_config {
+ int (*init)(void);
+ bool map_only_reserved;
+};
+
struct sram_partition {
void __iomem *base;
@@ -15,8 +20,11 @@ struct sram_partition {
};
struct sram_dev {
+ const struct sram_config *config;
+
struct device *dev;
void __iomem *virt_base;
+ bool no_memory_wc;
struct gen_pool *pool;
struct clk *clk;
@@ -29,6 +37,7 @@ struct sram_reserve {
struct list_head list;
u32 start;
u32 size;
+ struct resource res;
bool export;
bool pool;
bool protect_exec;