1 files changed, 94 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/clk/ti/clk-gate.c b/roms/u-boot/drivers/clk/ti/clk-gate.c
new file mode 100644
index 000000000..eb15f6243
--- /dev/null
+++ b/roms/u-boot/drivers/clk/ti/clk-gate.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * TI gate clock support
+ *
+ * Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+ *
+ * Loosely based on Linux kernel drivers/clk/ti/gate.c
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <clk-uclass.h>
+#include <asm/io.h>
+#include <linux/clk-provider.h>
+#include "clk.h"
+
+struct clk_ti_gate_priv {
+	struct clk_ti_reg reg;
+	u8 enable_bit;
+	u32 flags;
+	bool invert_enable;
+};
+
+static int clk_ti_gate_disable(struct clk *clk)
+{
+	struct clk_ti_gate_priv *priv = dev_get_priv(clk->dev);
+	u32 v;
+
+	v = clk_ti_readl(&priv->reg);
+	if (priv->invert_enable)
+		v |= (1 << priv->enable_bit);
+	else
+		v &= ~(1 << priv->enable_bit);
+
+	clk_ti_writel(v, &priv->reg);
+	/* No OCP barrier needed here since it is a disable operation */
+	return 0;
+}
+
+static int clk_ti_gate_enable(struct clk *clk)
+{
+	struct clk_ti_gate_priv *priv = dev_get_priv(clk->dev);
+	u32 v;
+
+	v = clk_ti_readl(&priv->reg);
+	if (priv->invert_enable)
+		v &= ~(1 << priv->enable_bit);
+	else
+		v |= (1 << priv->enable_bit);
+
+	clk_ti_writel(v, &priv->reg);
+	/* OCP barrier */
+	v = clk_ti_readl(&priv->reg);
+	return 0;
+}
+
+static int clk_ti_gate_of_to_plat(struct udevice *dev)
+{
+	struct clk_ti_gate_priv *priv = dev_get_priv(dev);
+	int err;
+
+	err = clk_ti_get_reg_addr(dev, 0, &priv->reg);
+	if (err) {
+		dev_err(dev, "failed to get control register address\n");
+		return err;
+	}
+
+	priv->enable_bit = dev_read_u32_default(dev, "ti,bit-shift", 0);
+	if (dev_read_bool(dev, "ti,set-rate-parent"))
+		priv->flags |= CLK_SET_RATE_PARENT;
+
+	priv->invert_enable = dev_read_bool(dev, "ti,set-bit-to-disable");
+	return 0;
+}
+
+static struct clk_ops clk_ti_gate_ops = {
+	.enable = clk_ti_gate_enable,
+	.disable = clk_ti_gate_disable,
+};
+
+static const struct udevice_id clk_ti_gate_of_match[] = {
+	{ .compatible = "ti,gate-clock" },
+	{ },
+};
+
+U_BOOT_DRIVER(clk_ti_gate) = {
+	.name = "ti_gate_clock",
+	.id = UCLASS_CLK,
+	.of_match = clk_ti_gate_of_match,
+	.of_to_plat = clk_ti_gate_of_to_plat,
+	.priv_auto = sizeof(struct clk_ti_gate_priv),
+	.ops = &clk_ti_gate_ops,
+};