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authorBoris BREZILLON <boris.brezillon@free-electrons.com>2015-06-18 15:46:21 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2015-06-19 22:18:03 +0800
commitdb509a45339fd786de355b11db34ff7421488cb1 (patch)
tree163109844167d10b714a722530ed60b81b096f9d /drivers/crypto/marvell/cesa.c
parentf63601fd616ab370774fa00ea10bcaaa9e48e84c (diff)
downloadlinux-db509a45339fd786de355b11db34ff7421488cb1.tar.gz
crypto: marvell/cesa - add TDMA support
The CESA IP supports CPU offload through a dedicated DMA engine (TDMA) which can control the crypto block. When you use this mode, all the required data (operation metadata and payload data) are transferred using DMA, and the results are retrieved through DMA when possible (hash results are not retrieved through DMA yet), thus reducing the involvement of the CPU and providing better performances in most cases (for small requests, the cost of DMA preparation might exceed the performance gain). Note that some CESA IPs do not embed this dedicated DMA, hence the activation of this feature on a per platform basis. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Arnaud Ebalard <arno@natisbad.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/marvell/cesa.c')
-rw-r--r--drivers/crypto/marvell/cesa.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/crypto/marvell/cesa.c b/drivers/crypto/marvell/cesa.c
index 76a694303839..986f024d73fa 100644
--- a/drivers/crypto/marvell/cesa.c
+++ b/drivers/crypto/marvell/cesa.c
@@ -184,6 +184,7 @@ static const struct mv_cesa_caps armada_370_caps = {
.ncipher_algs = ARRAY_SIZE(armada_370_cipher_algs),
.ahash_algs = armada_370_ahash_algs,
.nahash_algs = ARRAY_SIZE(armada_370_ahash_algs),
+ .has_tdma = true,
};
static const struct of_device_id mv_cesa_of_match_table[] = {
@@ -192,6 +193,66 @@ static const struct of_device_id mv_cesa_of_match_table[] = {
};
MODULE_DEVICE_TABLE(of, mv_cesa_of_match_table);
+static void
+mv_cesa_conf_mbus_windows(struct mv_cesa_engine *engine,
+ const struct mbus_dram_target_info *dram)
+{
+ void __iomem *iobase = engine->regs;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ writel(0, iobase + CESA_TDMA_WINDOW_CTRL(i));
+ writel(0, iobase + CESA_TDMA_WINDOW_BASE(i));
+ }
+
+ for (i = 0; i < dram->num_cs; i++) {
+ const struct mbus_dram_window *cs = dram->cs + i;
+
+ writel(((cs->size - 1) & 0xffff0000) |
+ (cs->mbus_attr << 8) |
+ (dram->mbus_dram_target_id << 4) | 1,
+ iobase + CESA_TDMA_WINDOW_CTRL(i));
+ writel(cs->base, iobase + CESA_TDMA_WINDOW_BASE(i));
+ }
+}
+
+static int mv_cesa_dev_dma_init(struct mv_cesa_dev *cesa)
+{
+ struct device *dev = cesa->dev;
+ struct mv_cesa_dev_dma *dma;
+
+ if (!cesa->caps->has_tdma)
+ return 0;
+
+ dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
+ if (!dma)
+ return -ENOMEM;
+
+ dma->tdma_desc_pool = dmam_pool_create("tdma_desc", dev,
+ sizeof(struct mv_cesa_tdma_desc),
+ 16, 0);
+ if (!dma->tdma_desc_pool)
+ return -ENOMEM;
+
+ dma->op_pool = dmam_pool_create("cesa_op", dev,
+ sizeof(struct mv_cesa_op_ctx), 16, 0);
+ if (!dma->op_pool)
+ return -ENOMEM;
+
+ dma->cache_pool = dmam_pool_create("cesa_cache", dev,
+ CESA_MAX_HASH_BLOCK_SIZE, 1, 0);
+ if (!dma->cache_pool)
+ return -ENOMEM;
+
+ dma->padding_pool = dmam_pool_create("cesa_padding", dev, 72, 1, 0);
+ if (!dma->cache_pool)
+ return -ENOMEM;
+
+ cesa->dma = dma;
+
+ return 0;
+}
+
static int mv_cesa_get_sram(struct platform_device *pdev, int idx)
{
struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
@@ -299,6 +360,10 @@ static int mv_cesa_probe(struct platform_device *pdev)
if (IS_ERR(cesa->regs))
return -ENOMEM;
+ ret = mv_cesa_dev_dma_init(cesa);
+ if (ret)
+ return ret;
+
dram = mv_mbus_dram_info_nooverlap();
platform_set_drvdata(pdev, cesa);
@@ -347,6 +412,9 @@ static int mv_cesa_probe(struct platform_device *pdev)
engine->regs = cesa->regs + CESA_ENGINE_OFF(i);
+ if (dram && cesa->caps->has_tdma)
+ mv_cesa_conf_mbus_windows(&cesa->engines[i], dram);
+
writel(0, cesa->engines[i].regs + CESA_SA_INT_STATUS);
writel(CESA_SA_CFG_STOP_DIG_ERR,
cesa->engines[i].regs + CESA_SA_CFG);