1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/clk/ti/clk-sci.c b/drivers/clk/ti/clk-sci.c
new file mode 100644
index 0000000..6f0fdaa
--- /dev/null
+++ b/drivers/clk/ti/clk-sci.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments System Control Interface (TI SCI) clock driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Andreas Dannenberg <dannenberg@ti.com>
+ *
+ * Loosely based on Linux kernel sci-clk.c...
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <clk-uclass.h>
+#include <log.h>
+#include <malloc.h>
+#include <dm/device_compat.h>
+#include <linux/err.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+#include <k3-avs.h>
+
+/**
+ * struct ti_sci_clk_data - clock controller information structure
+ * @sci: TI SCI handle used for communication with system controller
+ */
+struct ti_sci_clk_data {
+	const struct ti_sci_handle *sci;
+};
+
+static int ti_sci_clk_probe(struct udevice *dev)
+{
+	struct ti_sci_clk_data *data = dev_get_priv(dev);
+
+	debug("%s(dev=%p)\n", __func__, dev);
+
+	if (!data)
+		return -ENOMEM;
+
+	/* Store handle for communication with the system controller */
+	data->sci = ti_sci_get_handle(dev);
+	if (IS_ERR(data->sci))
+		return PTR_ERR(data->sci);
+
+	return 0;
+}
+
+static int ti_sci_clk_of_xlate(struct clk *clk,
+			       struct ofnode_phandle_args *args)
+{
+	debug("%s(clk=%p, args_count=%d)\n", __func__, clk, args->args_count);
+
+	if (args->args_count != 2) {
+		debug("Invalid args_count: %d\n", args->args_count);
+		return -EINVAL;
+	}
+
+	/*
+	 * On TI SCI-based devices, the clock provider id field is used as a
+	 * device ID, and the data field is used as the associated sub-ID.
+	 */
+	clk->id = args->args[0];
+	clk->data = args->args[1];
+
+	return 0;
+}
+
+static int ti_sci_clk_request(struct clk *clk)
+{
+	debug("%s(clk=%p)\n", __func__, clk);
+	return 0;
+}
+
+static int ti_sci_clk_free(struct clk *clk)
+{
+	debug("%s(clk=%p)\n", __func__, clk);
+	return 0;
+}
+
+static ulong ti_sci_clk_get_rate(struct clk *clk)
+{
+	struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
+	const struct ti_sci_handle *sci = data->sci;
+	const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
+	u64 current_freq;
+	int ret;
+
+	debug("%s(clk=%p)\n", __func__, clk);
+
+	ret = cops->get_freq(sci, clk->id, clk->data, &current_freq);
+	if (ret) {
+		dev_err(clk->dev, "%s: get_freq failed (%d)\n", __func__, ret);
+		return ret;
+	}
+
+	debug("%s(current_freq=%llu)\n", __func__, current_freq);
+
+	return current_freq;
+}
+
+static ulong ti_sci_clk_set_rate(struct clk *clk, ulong rate)
+{
+	struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
+	const struct ti_sci_handle *sci = data->sci;
+	const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
+	int ret;
+
+	debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
+
+#ifdef CONFIG_K3_AVS0
+	k3_avs_notify_freq(clk->id, clk->data, rate);
+#endif
+
+	ret = cops->set_freq(sci, clk->id, clk->data, 0, rate, ULONG_MAX);
+	if (ret)
+		dev_err(clk->dev, "%s: set_freq failed (%d)\n", __func__, ret);
+
+	return ret;
+}
+
+static int ti_sci_clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
+	const struct ti_sci_handle *sci = data->sci;
+	const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
+	u8 num_parents;
+	u8 parent_cid;
+	int ret;
+
+	debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
+
+	/* Make sure the clock parent is valid for a given device ID */
+	if (clk->id != parent->id)
+		return -EINVAL;
+
+	/* Make sure clock has parents that can be set */
+	ret = cops->get_num_parents(sci, clk->id, clk->data, &num_parents);
+	if (ret) {
+		dev_err(clk->dev, "%s: get_num_parents failed (%d)\n",
+			__func__, ret);
+		return ret;
+	}
+	if (num_parents < 2) {
+		dev_err(clk->dev, "%s: clock has no settable parents!\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	/* Make sure parent clock ID is valid */
+	parent_cid = parent->data - clk->data - 1;
+	if (parent_cid >= num_parents) {
+		dev_err(clk->dev, "%s: invalid parent clock!\n", __func__);
+		return -EINVAL;
+	}
+
+	/* Ready to proceed to configure the new clock parent */
+	ret = cops->set_parent(sci, clk->id, clk->data, parent->data);
+	if (ret)
+		dev_err(clk->dev, "%s: set_parent failed (%d)\n", __func__,
+			ret);
+
+	return ret;
+}
+
+static int ti_sci_clk_enable(struct clk *clk)
+{
+	struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
+	const struct ti_sci_handle *sci = data->sci;
+	const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
+	int ret;
+
+	debug("%s(clk=%p)\n", __func__, clk);
+
+	/*
+	 * Allow the System Controller to automatically manage the state of
+	 * this clock. If the device is enabled, then the clock is enabled.
+	 */
+	ret = cops->put_clock(sci, clk->id, clk->data);
+	if (ret)
+		dev_err(clk->dev, "%s: put_clock failed (%d)\n", __func__, ret);
+
+	return ret;
+}
+
+static int ti_sci_clk_disable(struct clk *clk)
+{
+	struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
+	const struct ti_sci_handle *sci = data->sci;
+	const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
+	int ret;
+
+	debug("%s(clk=%p)\n", __func__, clk);
+
+	/* Unconditionally disable clock, regardless of state of the device */
+	ret = cops->idle_clock(sci, clk->id, clk->data);
+	if (ret)
+		dev_err(clk->dev, "%s: idle_clock failed (%d)\n", __func__,
+			ret);
+
+	return ret;
+}
+
+static const struct udevice_id ti_sci_clk_of_match[] = {
+	{ .compatible = "ti,k2g-sci-clk" },
+	{ /* sentinel */ },
+};
+
+static struct clk_ops ti_sci_clk_ops = {
+	.of_xlate = ti_sci_clk_of_xlate,
+	.request = ti_sci_clk_request,
+	.rfree = ti_sci_clk_free,
+	.get_rate = ti_sci_clk_get_rate,
+	.set_rate = ti_sci_clk_set_rate,
+	.set_parent = ti_sci_clk_set_parent,
+	.enable = ti_sci_clk_enable,
+	.disable = ti_sci_clk_disable,
+};
+
+U_BOOT_DRIVER(ti_sci_clk) = {
+	.name = "ti-sci-clk",
+	.id = UCLASS_CLK,
+	.of_match = ti_sci_clk_of_match,
+	.probe = ti_sci_clk_probe,
+	.priv_auto	= sizeof(struct ti_sci_clk_data),
+	.ops = &ti_sci_clk_ops,
+};