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Subject[PATCH 4/9] mmc: dw_mmc-exynos: support FMP
Date
Exynos MMC uses FMP to encrypt data stored on MMC device.
FMP H/W reads crypto information from MMC descriptor.
So, when using FMP H/W, the format of MMC descriptor should be extended.
The FMP driver is registered with the diskcipher algorithm,
so exynos MMC calls diskcipher API to use FMP.

Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
---
drivers/mmc/host/Kconfig | 8 ++++++
drivers/mmc/host/dw_mmc-exynos.c | 62
++++++++++++++++++++++++++++++++++++++++
drivers/mmc/host/dw_mmc.c | 26 +++++++++++++++++
3 files changed, 96 insertions(+)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 14d89a1..f6c5a54 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -761,6 +761,14 @@ config MMC_DW_EXYNOS
Synopsys DesignWare Memory Card Interface driver. Select this
option
for platforms based on Exynos4 and Exynos5 SoC's.

+config MMC_DW_EXYNOS_FMP
+ tristate "EXYNOS Flash Memory Protector for MMC_DW"
+ depends on MMC_DW_EXYNOS
+ ---help---
+ This selects the EXYNOS MMC_DW FMP Driver.
+
+ If you have a controller with this interface, say Y or M here.
+
config MMC_DW_HI3798CV200
tristate "Hi3798CV200 specific extensions for Synopsys DW Memory
Card Interface"
depends on MMC_DW
diff --git a/drivers/mmc/host/dw_mmc-exynos.c
b/drivers/mmc/host/dw_mmc-exynos.c
index 5e3d95b..d3848ba 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -14,10 +14,12 @@
#include <linux/of_gpio.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
+#include <crypto/fmp.h>

#include "dw_mmc.h"
#include "dw_mmc-pltfm.h"
#include "dw_mmc-exynos.h"
+#include "../core/queue.h"

/* Variations in Exynos specific dw-mshc controller */
enum dw_mci_exynos_type {
@@ -508,6 +510,62 @@ static int dw_mci_exynos_prepare_hs400_tuning(struct
dw_mci *host,
return 0;
}

+#ifdef CONFIG_MMC_DW_EXYNOS_FMP
+static struct bio *get_bio(struct dw_mci *host,
+ struct mmc_data *data, bool cmdq_enabled)
+{
+ struct bio *bio = NULL;
+ struct mmc_queue_req *mq_rq = NULL;
+ struct request *req = NULL;
+ struct mmc_blk_request *brq = NULL;
+
+ if (!host || !data) {
+ pr_err("%s: Invalid MMC:%p data:%p\n", __func__, host,
data);
+ return NULL;
+ }
+
+ if (cmdq_enabled) {
+ pr_err("%s: no support cmdq yet:%p\n", __func__, host);
+ bio = NULL;
+ } else {
+ brq = container_of(data, struct mmc_blk_request, data);
+ if (!brq)
+ return NULL;
+
+ mq_rq = container_of(brq, struct mmc_queue_req, brq);
+ if (virt_addr_valid(mq_rq))
+ req = mmc_queue_req_to_req(mq_rq);
+ if (virt_addr_valid(req))
+ bio = req->bio;
+ }
+ return bio;
+}
+
+static int dw_mci_exynos_crypto_engine_cfg(struct dw_mci *host,
+ void *desc, struct mmc_data *data,
+ struct page *page, int page_index,
+ int sector_offset, bool
cmdq_enabled)
+{
+ struct bio *bio = get_bio(host, host->data, cmdq_enabled);
+
+ if (!bio)
+ return 0;
+
+ return exynos_fmp_crypt_cfg(bio, desc, page_index, sector_offset);
+}
+
+static int dw_mci_exynos_crypto_engine_clear(struct dw_mci *host,
+ void *desc, bool cmdq_enabled)
+{
+ struct bio *bio = get_bio(host, host->data, cmdq_enabled);
+
+ if (!bio)
+ return 0;
+
+ return exynos_fmp_crypt_clear(bio, desc);
+}
+#endif
+
/* Common capabilities of Exynos4/Exynos5 SoC */
static unsigned long exynos_dwmmc_caps[4] = {
MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23,
@@ -524,6 +582,10 @@ static const struct dw_mci_drv_data exynos_drv_data = {
.parse_dt = dw_mci_exynos_parse_dt,
.execute_tuning = dw_mci_exynos_execute_tuning,
.prepare_hs400_tuning = dw_mci_exynos_prepare_hs400_tuning,
+#ifdef CONFIG_MMC_DW_EXYNOS_FMP
+ .crypto_engine_cfg = dw_mci_exynos_crypto_engine_cfg,
+ .crypto_engine_clear = dw_mci_exynos_crypto_engine_clear,
+#endif
};

static const struct of_device_id dw_mci_exynos_match[] = {
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 0cdf574..4de476a 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -79,6 +79,32 @@ struct idmac_desc_64addr {

u32 des6; /* Lower 32-bits of Next Descriptor Address
*/
u32 des7; /* Upper 32-bits of Next Descriptor Address
*/
+#if defined(CONFIG_MMC_DW_EXYNOS_FMP)
+ u32 des8; /* File IV 0 */
+ u32 des9; /* File IV 1 */
+ u32 des10; /* File IV 2 */
+ u32 des11; /* File IV 3 */
+ u32 des12; /* File EncKey 0 */
+ u32 des13; /* File EncKey 1 */
+ u32 des14; /* File EncKey 2 */
+ u32 des15; /* File EncKey 3 */
+ u32 des16; /* File EncKey 4 */
+ u32 des17; /* File EncKey 5 */
+ u32 des18; /* File EncKey 6 */
+ u32 des19; /* File EncKey 7 */
+ u32 des20; /* File TwKey 0 */
+ u32 des21; /* File TwKey 1 */
+ u32 des22; /* File TwKey 2 */
+ u32 des23; /* File TwKey 3 */
+ u32 des24; /* File TwKey 4 */
+ u32 des25; /* File TwKey 5 */
+ u32 des26; /* File TwKey 6 */
+ u32 des27; /* File TwKey 7 */
+ u32 des28; /* Disk IV 0 */
+ u32 des29; /* Disk IV 1 */
+ u32 des30; /* Disk IV 2 */
+ u32 des31; /* Disk IV 3 */
+#endif
};

struct idmac_desc {
--
2.7.4
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