1 files changed, 154 insertions, 0 deletions
diff --git a/drivers/clk/ti/clk-ctrl.c b/drivers/clk/ti/clk-ctrl.c
new file mode 100644
index 0000000..940e8d6
--- /dev/null
+++ b/drivers/clk/ti/clk-ctrl.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * OMAP clock controller support
+ *
+ * Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <clk-uclass.h>
+#include <asm/arch-am33xx/clock.h>
+
+struct clk_ti_ctrl_offs {
+	fdt_addr_t start;
+	fdt_size_t end;
+};
+
+struct clk_ti_ctrl_priv {
+	int offs_num;
+	struct clk_ti_ctrl_offs *offs;
+};
+
+static int clk_ti_ctrl_check_offs(struct clk *clk, fdt_addr_t offs)
+{
+	struct clk_ti_ctrl_priv *priv = dev_get_priv(clk->dev);
+	int i;
+
+	for (i = 0; i < priv->offs_num; i++) {
+		if (offs >= priv->offs[i].start && offs <= priv->offs[i].end)
+			return 0;
+	}
+
+	return -EFAULT;
+}
+
+static int clk_ti_ctrl_disable(struct clk *clk)
+{
+	struct clk_ti_ctrl_priv *priv = dev_get_priv(clk->dev);
+	u32 *clk_modules[2] = { };
+	fdt_addr_t offs;
+	int err;
+
+	offs = priv->offs[0].start + clk->id;
+	err = clk_ti_ctrl_check_offs(clk, offs);
+	if (err) {
+		dev_err(clk->dev, "invalid offset: 0x%lx\n", offs);
+		return err;
+	}
+
+	clk_modules[0] = (u32 *)(offs);
+	dev_dbg(clk->dev, "module address=%p\n", clk_modules[0]);
+	do_disable_clocks(NULL, clk_modules, 1);
+	return 0;
+}
+
+static int clk_ti_ctrl_enable(struct clk *clk)
+{
+	struct clk_ti_ctrl_priv *priv = dev_get_priv(clk->dev);
+	u32 *clk_modules[2] = { };
+	fdt_addr_t offs;
+	int err;
+
+	offs = priv->offs[0].start + clk->id;
+	err = clk_ti_ctrl_check_offs(clk, offs);
+	if (err) {
+		dev_err(clk->dev, "invalid offset: 0x%lx\n", offs);
+		return err;
+	}
+
+	clk_modules[0] = (u32 *)(offs);
+	dev_dbg(clk->dev, "module address=%p\n", clk_modules[0]);
+	do_enable_clocks(NULL, clk_modules, 1);
+	return 0;
+}
+
+static ulong clk_ti_ctrl_get_rate(struct clk *clk)
+{
+	return 0;
+}
+
+static int clk_ti_ctrl_of_xlate(struct clk *clk,
+				struct ofnode_phandle_args *args)
+{
+	if (args->args_count != 2) {
+		dev_err(clk->dev, "invaild args_count: %d\n", args->args_count);
+		return -EINVAL;
+	}
+
+	if (args->args_count)
+		clk->id = args->args[0];
+	else
+		clk->id = 0;
+
+	dev_dbg(clk->dev, "name=%s, id=%ld\n", clk->dev->name, clk->id);
+	return 0;
+}
+
+static int clk_ti_ctrl_of_to_plat(struct udevice *dev)
+{
+	struct clk_ti_ctrl_priv *priv = dev_get_priv(dev);
+	fdt_size_t fdt_size;
+	int i, size;
+
+	size = dev_read_size(dev, "reg");
+	if (size < 0) {
+		dev_err(dev, "failed to get 'reg' size\n");
+		return size;
+	}
+
+	priv->offs_num = size / 2 / sizeof(u32);
+	dev_dbg(dev, "size=%d, regs_num=%d\n", size, priv->offs_num);
+
+	priv->offs = kmalloc_array(priv->offs_num, sizeof(*priv->offs),
+				   GFP_KERNEL);
+	if (!priv->offs)
+		return -ENOMEM;
+
+	for (i = 0; i < priv->offs_num; i++) {
+		priv->offs[i].start =
+			dev_read_addr_size_index(dev, i, &fdt_size);
+		if (priv->offs[i].start == FDT_ADDR_T_NONE) {
+			dev_err(dev, "failed to get offset %d\n", i);
+			return -EINVAL;
+		}
+
+		priv->offs[i].end = priv->offs[i].start + fdt_size;
+		dev_dbg(dev, "start=0x%08lx, end=0x%08lx\n",
+			priv->offs[i].start, priv->offs[i].end);
+	}
+
+	return 0;
+}
+
+static struct clk_ops clk_ti_ctrl_ops = {
+	.of_xlate = clk_ti_ctrl_of_xlate,
+	.enable = clk_ti_ctrl_enable,
+	.disable = clk_ti_ctrl_disable,
+	.get_rate = clk_ti_ctrl_get_rate,
+};
+
+static const struct udevice_id clk_ti_ctrl_ids[] = {
+	{.compatible = "ti,clkctrl"},
+	{},
+};
+
+U_BOOT_DRIVER(clk_ti_ctrl) = {
+	.name = "ti_ctrl_clk",
+	.id = UCLASS_CLK,
+	.of_match = clk_ti_ctrl_ids,
+	.ofdata_to_platdata = clk_ti_ctrl_of_to_plat,
+	.ops = &clk_ti_ctrl_ops,
+	.priv_auto = sizeof(struct clk_ti_ctrl_priv),
+};