crypto: hisilicon - enable sec device clock gating

Kunpeng930 sec device supports dynamic clock gating. When doing tasks,
the algorithm core is opened, and when idle, the algorithm core is closed.
This patch enables sec dynamic clock gating by writing hardware registers.
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/hisilicon/sec2/sec_main.c

@@ -57,10 +57,16 @@
 #define SEC_MEM_START_INIT_REG	0x301100
 #define SEC_MEM_INIT_DONE_REG		0x301104
 
+/* clock gating */
 #define SEC_CONTROL_REG		0x301200
-#define SEC_TRNG_EN_SHIFT		8
+#define SEC_DYNAMIC_GATE_REG		0x30121c
+#define SEC_CORE_AUTO_GATE		0x30212c
+#define SEC_DYNAMIC_GATE_EN		0x7bff
+#define SEC_CORE_AUTO_GATE_EN		GENMASK(3, 0)
 #define SEC_CLK_GATE_ENABLE		BIT(3)
 #define SEC_CLK_GATE_DISABLE		(~BIT(3))
+
+#define SEC_TRNG_EN_SHIFT		8
 #define SEC_AXI_SHUTDOWN_ENABLE	BIT(12)
 #define SEC_AXI_SHUTDOWN_DISABLE	0xFFFFEFFF
 
@@ -378,15 +384,43 @@ static void sec_close_sva_prefetch(struct hisi_qm *qm)
 		pci_err(qm->pdev, "failed to close sva prefetch\n");
 }
 
+static void sec_enable_clock_gate(struct hisi_qm *qm)
+{
+	u32 val;
+
+	if (qm->ver < QM_HW_V3)
+		return;
+
+	val = readl_relaxed(qm->io_base + SEC_CONTROL_REG);
+	val |= SEC_CLK_GATE_ENABLE;
+	writel_relaxed(val, qm->io_base + SEC_CONTROL_REG);
+
+	val = readl(qm->io_base + SEC_DYNAMIC_GATE_REG);
+	val |= SEC_DYNAMIC_GATE_EN;
+	writel(val, qm->io_base + SEC_DYNAMIC_GATE_REG);
+
+	val = readl(qm->io_base + SEC_CORE_AUTO_GATE);
+	val |= SEC_CORE_AUTO_GATE_EN;
+	writel(val, qm->io_base + SEC_CORE_AUTO_GATE);
+}
+
+static void sec_disable_clock_gate(struct hisi_qm *qm)
+{
+	u32 val;
+
+	/* Kunpeng920 needs to close clock gating */
+	val = readl_relaxed(qm->io_base + SEC_CONTROL_REG);
+	val &= SEC_CLK_GATE_DISABLE;
+	writel_relaxed(val, qm->io_base + SEC_CONTROL_REG);
+}
+
 static int sec_engine_init(struct hisi_qm *qm)
 {
 	int ret;
 	u32 reg;
 
-	/* disable clock gate control */
-	reg = readl_relaxed(qm->io_base + SEC_CONTROL_REG);
-	reg &= SEC_CLK_GATE_DISABLE;
-	writel_relaxed(reg, qm->io_base + SEC_CONTROL_REG);
+	/* disable clock gate control before mem init */
+	sec_disable_clock_gate(qm);
 
 	writel_relaxed(0x1, qm->io_base + SEC_MEM_START_INIT_REG);
 
@@ -433,6 +467,8 @@ static int sec_engine_init(struct hisi_qm *qm)
 	reg |= sec_get_endian(qm);
 	writel_relaxed(reg, qm->io_base + SEC_CONTROL_REG);
 
+	sec_enable_clock_gate(qm);
+
 	return 0;
 }