>
> Add inline encryption support to ufs-mediatek.
>
> The standards-compliant parts, such as querying the crypto capabilities
> and enabling crypto for individual UFS requests, are already handled by
> ufshcd-crypto.c, which itself is wired into the blk-crypto framework.
>
> However MediaTek UFS host requires a vendor-specific hce_enable operation
> to allow crypto-related registers being accessed normally in kernel.
> After this step, MediaTek UFS host can work as standard-compliant host
> for inline-encryption related functions.
>
> Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>
> ---
> drivers/scsi/ufs/ufs-mediatek.c | 22 ++++++++++++++++++++++
> drivers/scsi/ufs/ufs-mediatek.h | 1 +
> 2 files changed, 23 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
> index ad929235c193..31af8b3d2b53 100644
> --- a/drivers/scsi/ufs/ufs-mediatek.c
> +++ b/drivers/scsi/ufs/ufs-mediatek.c
> @@ -16,6 +16,7 @@
> #include <linux/soc/mediatek/mtk_sip_svc.h>
>
> #include "ufshcd.h"
> +#include "ufshcd-crypto.h"
> #include "ufshcd-pltfrm.h"
> #include "ufs_quirks.h"
> #include "unipro.h"
> @@ -25,6 +26,9 @@
> arm_smccc_smc(MTK_SIP_UFS_CONTROL, \
> cmd, val, 0, 0, 0, 0, 0, &(res))
>
> +#define ufs_mtk_crypto_ctrl(res, enable) \
> + ufs_mtk_smc(UFS_MTK_SIP_CRYPTO_CTRL, enable, res)
> +
> #define ufs_mtk_ref_clk_notify(on, res) \
> ufs_mtk_smc(UFS_MTK_SIP_REF_CLK_NOTIFICATION, on, res)
>
> @@ -73,6 +77,18 @@ static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba,
> bool enable)
> }
> }
>
> +static void ufs_mtk_crypto_enable(struct ufs_hba *hba)
> +{
> + struct arm_smccc_res res;
> +
> + ufs_mtk_crypto_ctrl(res, 1);
> + if (res.a0) {
> + dev_info(hba->dev, "%s: crypto enable failed, err: %lu\n",
> + __func__, res.a0);
> + hba->caps &= ~UFSHCD_CAP_CRYPTO;
> + }
> +}
> +
> static int ufs_mtk_hce_enable_notify(struct ufs_hba *hba,
> enum ufs_notify_change_status status)
> {
> @@ -83,6 +99,9 @@ static int ufs_mtk_hce_enable_notify(struct ufs_hba
> *hba,
> hba->vps->hba_enable_delay_us = 0;
> else
> hba->vps->hba_enable_delay_us = 600;
> +
> + if (hba->caps & UFSHCD_CAP_CRYPTO)
> + ufs_mtk_crypto_enable(hba);
> }
>
> return 0;
> @@ -317,6 +336,9 @@ static int ufs_mtk_init(struct ufs_hba *hba)
> /* Enable clock-gating */
> hba->caps |= UFSHCD_CAP_CLK_GATING;
>
> + /* Enable inline encryption */
> + hba->caps |= UFSHCD_CAP_CRYPTO;
> +
> /* Enable WriteBooster */
> hba->caps |= UFSHCD_CAP_WB_EN;
> hba->vps->wb_flush_threshold = UFS_WB_BUF_REMAIN_PERCENT(80);
> diff --git a/drivers/scsi/ufs/ufs-mediatek.h b/drivers/scsi/ufs/ufs-mediatek.h
> index 6052ec105aba..8ed24d5fcff9 100644
> --- a/drivers/scsi/ufs/ufs-mediatek.h
> +++ b/drivers/scsi/ufs/ufs-mediatek.h
> @@ -70,6 +70,7 @@ enum {
> */
> #define MTK_SIP_UFS_CONTROL MTK_SIP_SMC_CMD(0x276)
> #define UFS_MTK_SIP_DEVICE_RESET BIT(1)
> +#define UFS_MTK_SIP_CRYPTO_CTRL BIT(2)
> #define UFS_MTK_SIP_REF_CLK_NOTIFICATION BIT(3)
>
> /*
> --
> 2.18.0
