[PATCH v3 1/2] scsi: ufs-mediatek: Support performance mode for inline encryption engine

Stanley Chu
2020-09-14T05:01:32Z

Some MediaTek UFS platforms support high-performance mode that inline
encryption engine can be boosted while UFS is not clock-gated.

The high-performance mode will be enabled if all below conditions are
well-declaired in device tree,

- Proper platform-specific compatible string which enables the host
capability "UFS_MTK_CAP_BOOST_CRYPT_ENGINE".

- "dvfsrc-vcore" node is available in this platform.

- Required minimum vcore voltage for high-performance mode.

- Clock mux and clock parents of inline encryption engine for both
"low-power mode" and "high-performance mode".

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/scsi/ufs/ufs-mediatek.c | 183 ++++++++++++++++++++++++++++++--
drivers/scsi/ufs/ufs-mediatek.h | 22 ++++
2 files changed, 199 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index 3ec44dfa2567..ac5d01238ee9 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -10,6 +10,7 @@
#include <linux/bitfield.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
@@ -44,6 +45,28 @@ static struct ufs_dev_fix ufs_mtk_dev_fixups[] = {
END_FIX
};

+static const struct ufs_mtk_host_cfg ufs_mtk_mt8192_cfg = {
+ .caps = UFS_MTK_CAP_BOOST_CRYPT_ENGINE,
+};
+
+static const struct of_device_id ufs_mtk_of_match[] = {
+ {
+ .compatible = "mediatek,mt8183-ufshci",
+ },
+ {
+ .compatible = "mediatek,mt8192-ufshci",
+ .data = &ufs_mtk_mt8192_cfg
+ },
+ {},
+};
+
+static bool ufs_mtk_is_boost_crypt_enabled(struct ufs_hba *hba)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+ return (host->caps & UFS_MTK_CAP_BOOST_CRYPT_ENGINE);
+}
+
static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
{
u32 tmp;
@@ -294,6 +317,144 @@ static void ufs_mtk_mphy_power_on(struct ufs_hba *hba, bool on)
host->mphy_powered_on = on;
}

+static int ufs_mtk_get_host_clk(struct device *dev, const char *name,
+ struct clk **clk_out)
+{
+ struct clk *clk;
+ int err = 0;
+
+ clk = devm_clk_get(dev, name);
+ if (IS_ERR(clk))
+ err = PTR_ERR(clk);
+ else
+ *clk_out = clk;
+
+ return err;
+}
+
+static void ufs_mtk_boost_crypt(struct ufs_hba *hba, bool boost)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+ struct ufs_mtk_crypt_cfg *cfg;
+ struct regulator *reg;
+ int volt, ret;
+
+ if (!ufs_mtk_is_boost_crypt_enabled(hba))
+ return;
+
+ cfg = host->crypt;
+ volt = cfg->vcore_volt;
+ reg = cfg->reg_vcore;
+
+ ret = clk_prepare_enable(cfg->clk_crypt_mux);
+ if (ret) {
+ dev_info(hba->dev, "clk_prepare_enable(): %d\n",
+ ret);
+ return;
+ }
+
+ if (boost) {
+ ret = regulator_set_voltage(reg, volt, INT_MAX);
+ if (ret) {
+ dev_info(hba->dev,
+ "failed to set vcore to %d\n", volt);
+ goto out;
+ }
+
+ ret = clk_set_parent(cfg->clk_crypt_mux,
+ cfg->clk_crypt_perf);
+ if (ret) {
+ dev_info(hba->dev,
+ "failed to set clk_crypt_perf\n");
+ regulator_set_voltage(reg, 0, INT_MAX);
+ goto out;
+ }
+ } else {
+ ret = clk_set_parent(cfg->clk_crypt_mux,
+ cfg->clk_crypt_lp);
+ if (ret) {
+ dev_info(hba->dev,
+ "failed to set clk_crypt_lp\n");
+ goto out;
+ }
+
+ ret = regulator_set_voltage(reg, 0, INT_MAX);
+ if (ret) {
+ dev_info(hba->dev,
+ "failed to set vcore to MIN\n");
+ }
+ }
+out:
+ clk_disable_unprepare(cfg->clk_crypt_mux);
+}
+
+static int ufs_mtk_init_host_clk(struct ufs_hba *hba, const char *name,
+ struct clk **clk)
+{
+ int ret;
+
+ ret = ufs_mtk_get_host_clk(hba->dev, name, clk);
+ if (ret) {
+ dev_info(hba->dev, "%s: failed to get %s: %d", __func__,
+ name, ret);
+ }
+
+ return ret;
+}
+
+static void ufs_mtk_init_host_caps(struct ufs_hba *hba)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+ struct ufs_mtk_crypt_cfg *cfg;
+ struct device *dev = hba->dev;
+ struct regulator *reg;
+ u32 volt;
+
+ host->caps = host->cfg->caps;
+
+ if (!ufs_mtk_is_boost_crypt_enabled(hba))
+ return;
+
+ host->crypt = devm_kzalloc(dev, sizeof(*(host->crypt)),
+ GFP_KERNEL);
+ if (!host->crypt)
+ goto disable_caps;
+
+ reg = devm_regulator_get_optional(dev, "dvfsrc-vcore");
+ if (IS_ERR(reg)) {
+ dev_info(dev, "failed to get dvfsrc-vcore: %ld",
+ PTR_ERR(reg));
+ goto disable_caps;
+ }
+
+ if (of_property_read_u32(dev->of_node, "boost-crypt-vcore-min",
+ &volt)) {
+ dev_info(dev, "failed to get boost-crypt-vcore-min");
+ goto disable_caps;
+ }
+
+ cfg = host->crypt;
+ if (ufs_mtk_init_host_clk(hba, "crypt_mux",
+ &cfg->clk_crypt_mux))
+ goto disable_caps;
+
+ if (ufs_mtk_init_host_clk(hba, "crypt_lp",
+ &cfg->clk_crypt_lp))
+ goto disable_caps;
+
+ if (ufs_mtk_init_host_clk(hba, "crypt_perf",
+ &cfg->clk_crypt_perf))
+ goto disable_caps;
+
+ cfg->reg_vcore = reg;
+ cfg->vcore_volt = volt;
+ dev_info(dev, "caps: boost-crypt");
+ return;
+
+disable_caps:
+ host->caps &= ~UFS_MTK_CAP_BOOST_CRYPT_ENGINE;
+}
+
/**
* ufs_mtk_setup_clocks - enables/disable clocks
* @hba: host controller instance
@@ -336,12 +497,14 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,
}

if (clk_pwr_off) {
+ ufs_mtk_boost_crypt(hba, on);
ufs_mtk_setup_ref_clk(hba, on);
ufs_mtk_mphy_power_on(hba, on);
}
} else if (on && status == POST_CHANGE) {
ufs_mtk_mphy_power_on(hba, on);
ufs_mtk_setup_ref_clk(hba, on);
+ ufs_mtk_boost_crypt(hba, on);
}

return ret;
@@ -359,8 +522,9 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,
*/
static int ufs_mtk_init(struct ufs_hba *hba)
{
- struct ufs_mtk_host *host;
+ const struct of_device_id *id;
struct device *dev = hba->dev;
+ struct ufs_mtk_host *host;
int err = 0;

host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
@@ -373,6 +537,18 @@ static int ufs_mtk_init(struct ufs_hba *hba)
host->hba = hba;
ufshcd_set_variant(hba, host);

+ /* Get host capability and platform data */
+ id = of_match_device(ufs_mtk_of_match, dev);
+ if (!id) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (id->data) {
+ host->cfg = (struct ufs_mtk_host_cfg *)id->data;
+ ufs_mtk_init_host_caps(hba);
+ }
+
err = ufs_mtk_bind_mphy(hba);
if (err)
goto out_variant_clear;
@@ -782,11 +958,6 @@ static int ufs_mtk_remove(struct platform_device *pdev)
return 0;
}

-static const struct of_device_id ufs_mtk_of_match[] = {
- { .compatible = "mediatek,mt8183-ufshci"},
- {},
-};
-
static const struct dev_pm_ops ufs_mtk_pm_ops = {
.suspend = ufshcd_pltfrm_suspend,
.resume = ufshcd_pltfrm_resume,
diff --git a/drivers/scsi/ufs/ufs-mediatek.h b/drivers/scsi/ufs/ufs-mediatek.h
index 5c32d5f52759..2b6a1312c9bc 100644
--- a/drivers/scsi/ufs/ufs-mediatek.h
+++ b/drivers/scsi/ufs/ufs-mediatek.h
@@ -89,9 +89,31 @@ enum {
TX_CLK_GATE_EN = 3,
};

+/*
+ * Host capability
+ */
+enum ufs_mtk_host_caps {
+ UFS_MTK_CAP_BOOST_CRYPT_ENGINE = 1 << 0,
+};
+
+struct ufs_mtk_crypt_cfg {
+ struct regulator *reg_vcore;
+ struct clk *clk_crypt_perf;
+ struct clk *clk_crypt_mux;
+ struct clk *clk_crypt_lp;
+ int vcore_volt;
+};
+
+struct ufs_mtk_host_cfg {
+ enum ufs_mtk_host_caps caps;
+};
+
struct ufs_mtk_host {
struct ufs_hba *hba;
struct phy *mphy;
+ struct ufs_mtk_host_cfg *cfg;
+ struct ufs_mtk_crypt_cfg *crypt;
+ enum ufs_mtk_host_caps caps;
struct reset_control *hci_reset;
struct reset_control *unipro_reset;
struct reset_control *crypto_reset;