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authorBoris BREZILLON <boris.brezillon@free-electrons.com>2015-06-18 15:46:18 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2015-06-19 22:18:02 +0800
commit51b44fc81178136bca88565dad07c067c8dc51da (patch)
treef59a15c9ae84ea0bdf05624a47bc399f0c543e03 /drivers/crypto/mv_cesa.c
parent1c075486852920241ace0f8087498c3ef6522fb2 (diff)
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crypto: mv_cesa - use gen_pool to reserve the SRAM memory region
The mv_cesa driver currently expects the SRAM memory region to be passed as a platform device resource. This approach implies two drawbacks: - the DT representation is wrong - the only one that can access the SRAM is the crypto engine The last point is particularly annoying in some cases: for example on armada 370, a small region of the crypto SRAM is used to implement the cpuidle, which means you would not be able to enable both cpuidle and the CESA driver. To address that problem, we explicitly define the SRAM device in the DT and then reference the sram node from the crypto engine node. Also note that the old way of retrieving the SRAM memory region is still supported, or in other words, backward compatibility is preserved. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/mv_cesa.c')
-rw-r--r--drivers/crypto/mv_cesa.c58
1 files changed, 43 insertions, 15 deletions
diff --git a/drivers/crypto/mv_cesa.c b/drivers/crypto/mv_cesa.c
index eb645c2cf3eb..e31d82c1eebe 100644
--- a/drivers/crypto/mv_cesa.c
+++ b/drivers/crypto/mv_cesa.c
@@ -9,6 +9,7 @@
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <linux/crypto.h>
+#include <linux/genalloc.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kthread.h>
@@ -29,6 +30,8 @@
#define MAX_HW_HASH_SIZE 0xFFFF
#define MV_CESA_EXPIRE 500 /* msec */
+#define MV_CESA_DEFAULT_SRAM_SIZE 2048
+
/*
* STM:
* /---------------------------------------\
@@ -83,6 +86,8 @@ struct req_progress {
struct crypto_priv {
void __iomem *reg;
void __iomem *sram;
+ struct gen_pool *sram_pool;
+ dma_addr_t sram_dma;
int irq;
struct clk *clk;
struct task_struct *queue_th;
@@ -1019,6 +1024,39 @@ static struct ahash_alg mv_hmac_sha1_alg = {
}
};
+static int mv_cesa_get_sram(struct platform_device *pdev,
+ struct crypto_priv *cp)
+{
+ struct resource *res;
+ u32 sram_size = MV_CESA_DEFAULT_SRAM_SIZE;
+
+ of_property_read_u32(pdev->dev.of_node, "marvell,crypto-sram-size",
+ &sram_size);
+
+ cp->sram_size = sram_size;
+ cp->sram_pool = of_get_named_gen_pool(&pdev->dev.of_node,
+ "marvell,crypto-srams", 0);
+ if (cp->sram_pool) {
+ cp->sram = gen_pool_dma_alloc(cp->sram_pool, sram_size,
+ &cp->sram_dma);
+ if (cp->sram)
+ return 0;
+
+ return -ENOMEM;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "sram");
+ if (!res || resource_size(res) < cp->sram_size)
+ return -EINVAL;
+
+ cp->sram = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(cp->sram))
+ return PTR_ERR(cp->sram);
+
+ return 0;
+}
+
static int mv_probe(struct platform_device *pdev)
{
struct crypto_priv *cp;
@@ -1047,18 +1085,11 @@ static int mv_probe(struct platform_device *pdev)
goto err;
}
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
- if (!res) {
- ret = -ENXIO;
+ ret = mv_cesa_get_sram(pdev, cp);
+ if (ret)
goto err;
- }
- cp->sram_size = resource_size(res);
+
cp->max_req_size = cp->sram_size - SRAM_CFG_SPACE;
- cp->sram = ioremap(res->start, cp->sram_size);
- if (!cp->sram) {
- ret = -ENOMEM;
- goto err;
- }
if (pdev->dev.of_node)
irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
@@ -1066,7 +1097,7 @@ static int mv_probe(struct platform_device *pdev)
irq = platform_get_irq(pdev, 0);
if (irq < 0 || irq == NO_IRQ) {
ret = irq;
- goto err_unmap_sram;
+ goto err;
}
cp->irq = irq;
@@ -1076,7 +1107,7 @@ static int mv_probe(struct platform_device *pdev)
cp->queue_th = kthread_run(queue_manag, cp, "mv_crypto");
if (IS_ERR(cp->queue_th)) {
ret = PTR_ERR(cp->queue_th);
- goto err_unmap_sram;
+ goto err;
}
ret = request_irq(irq, crypto_int, 0, dev_name(&pdev->dev),
@@ -1134,8 +1165,6 @@ err_irq:
}
err_thread:
kthread_stop(cp->queue_th);
-err_unmap_sram:
- iounmap(cp->sram);
err:
kfree(cp);
cpg = NULL;
@@ -1155,7 +1184,6 @@ static int mv_remove(struct platform_device *pdev)
kthread_stop(cp->queue_th);
free_irq(cp->irq, cp);
memset(cp->sram, 0, cp->sram_size);
- iounmap(cp->sram);
if (!IS_ERR(cp->clk)) {
clk_disable_unprepare(cp->clk);