drm/sun4i: Add a DRC driver

The A33 pipeline also has a component called DRC. Even though its exact
features and programming model is not known (or documented), it needs to
be clocked for the pipeline to carry the video signal all the way.

Add a minimal driver for it that just claim the needed resources for the
pipeline to operate properly.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Peter Korsgaard <peter@korsgaard.com>

2 files changed, 119 insertions, 1 deletions

diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index 58cd55149827..d625a82a6e5f 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -9,5 +9,5 @@ sun4i-tcon-y += sun4i_dotclock.o
 
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i_backend.o
-
+obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
diff --git a/drivers/gpu/drm/sun4i/sun6i_drc.c b/drivers/gpu/drm/sun4i/sun6i_drc.c
new file mode 100644
index 000000000000..bf6d846d8132
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun6i_drc.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2016 Free Electrons
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+struct sun6i_drc {
+	struct clk		*bus_clk;
+	struct clk		*mod_clk;
+	struct reset_control	*reset;
+};
+
+static int sun6i_drc_bind(struct device *dev, struct device *master,
+			 void *data)
+{
+	struct sun6i_drc *drc;
+	int ret;
+
+	drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL);
+	if (!drc)
+		return -ENOMEM;
+	dev_set_drvdata(dev, drc);
+
+	drc->reset = devm_reset_control_get(dev, NULL);
+	if (IS_ERR(drc->reset)) {
+		dev_err(dev, "Couldn't get our reset line\n");
+		return PTR_ERR(drc->reset);
+	}
+
+	ret = reset_control_deassert(drc->reset);
+	if (ret) {
+		dev_err(dev, "Couldn't deassert our reset line\n");
+		return ret;
+	}
+
+	drc->bus_clk = devm_clk_get(dev, "ahb");
+	if (IS_ERR(drc->bus_clk)) {
+		dev_err(dev, "Couldn't get our bus clock\n");
+		ret = PTR_ERR(drc->bus_clk);
+		goto err_assert_reset;
+	}
+	clk_prepare_enable(drc->bus_clk);
+
+	drc->mod_clk = devm_clk_get(dev, "mod");
+	if (IS_ERR(drc->mod_clk)) {
+		dev_err(dev, "Couldn't get our mod clock\n");
+		ret = PTR_ERR(drc->mod_clk);
+		goto err_disable_bus_clk;
+	}
+	clk_prepare_enable(drc->mod_clk);
+
+	return 0;
+
+err_disable_bus_clk:
+	clk_disable_unprepare(drc->bus_clk);
+err_assert_reset:
+	reset_control_assert(drc->reset);
+	return ret;
+}
+
+static void sun6i_drc_unbind(struct device *dev, struct device *master,
+			    void *data)
+{
+	struct sun6i_drc *drc = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(drc->mod_clk);
+	clk_disable_unprepare(drc->bus_clk);
+	reset_control_assert(drc->reset);
+}
+
+static struct component_ops sun6i_drc_ops = {
+	.bind	= sun6i_drc_bind,
+	.unbind	= sun6i_drc_unbind,
+};
+
+static int sun6i_drc_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &sun6i_drc_ops);
+}
+
+static int sun6i_drc_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &sun6i_drc_ops);
+
+	return 0;
+}
+
+static const struct of_device_id sun6i_drc_of_table[] = {
+	{ .compatible = "allwinner,sun8i-a33-drc" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sun6i_drc_of_table);
+
+static struct platform_driver sun6i_drc_platform_driver = {
+	.probe		= sun6i_drc_probe,
+	.remove		= sun6i_drc_remove,
+	.driver		= {
+		.name		= "sun6i-drc",
+		.of_match_table	= sun6i_drc_of_table,
+	},
+};
+module_platform_driver(sun6i_drc_platform_driver);
+
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
+MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver");
+MODULE_LICENSE("GPL");