1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_tcon.c b/drivers/gpu/drm/fsl-dcu/fsl_tcon.c
new file mode 100644
index 000000000000..bbe34f1c0505
--- /dev/null
+++ b/drivers/gpu/drm/fsl-dcu/fsl_tcon.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2015 Toradex AG
+ *
+ * Stefan Agner <stefan@agner.ch>
+ *
+ * Freescale TCON device driver
+ *
+ * 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/io.h>
+#include <linux/mm.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "fsl_tcon.h"
+
+void fsl_tcon_bypass_disable(struct fsl_tcon *tcon)
+{
+	regmap_update_bits(tcon->regs, FSL_TCON_CTRL1,
+			   FSL_TCON_CTRL1_TCON_BYPASS, 0);
+}
+
+void fsl_tcon_bypass_enable(struct fsl_tcon *tcon)
+{
+	regmap_update_bits(tcon->regs, FSL_TCON_CTRL1,
+			   FSL_TCON_CTRL1_TCON_BYPASS,
+			   FSL_TCON_CTRL1_TCON_BYPASS);
+}
+
+static struct regmap_config fsl_tcon_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+
+	.name = "tcon",
+};
+
+static int fsl_tcon_init_regmap(struct device *dev,
+				struct fsl_tcon *tcon,
+				struct device_node *np)
+{
+	struct resource res;
+	void __iomem *regs;
+
+	if (of_address_to_resource(np, 0, &res))
+		return -EINVAL;
+
+	regs = devm_ioremap_resource(dev, &res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	tcon->regs = devm_regmap_init_mmio(dev, regs,
+					   &fsl_tcon_regmap_config);
+	if (IS_ERR(tcon->regs))
+		return PTR_ERR(tcon->regs);
+
+	return 0;
+}
+
+struct fsl_tcon *fsl_tcon_init(struct device *dev)
+{
+	struct fsl_tcon *tcon;
+	struct device_node *np;
+	int ret;
+
+	/* TCON node is not mandatory, some devices do not provide TCON */
+	np = of_parse_phandle(dev->of_node, "fsl,tcon", 0);
+	if (!np)
+		return NULL;
+
+	tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL);
+	if (!tcon) {
+		ret = -ENOMEM;
+		goto err_node_put;
+	}
+
+	ret = fsl_tcon_init_regmap(dev, tcon, np);
+	if (ret) {
+		dev_err(dev, "Couldn't create the TCON regmap\n");
+		goto err_node_put;
+	}
+
+	tcon->ipg_clk = of_clk_get_by_name(np, "ipg");
+	if (IS_ERR(tcon->ipg_clk)) {
+		dev_err(dev, "Couldn't get the TCON bus clock\n");
+		goto err_node_put;
+	}
+
+	clk_prepare_enable(tcon->ipg_clk);
+
+	dev_info(dev, "Using TCON in bypass mode\n");
+
+	return tcon;
+
+err_node_put:
+	of_node_put(np);
+	return NULL;
+}
+
+void fsl_tcon_free(struct fsl_tcon *tcon)
+{
+	clk_disable_unprepare(tcon->ipg_clk);
+	clk_put(tcon->ipg_clk);
+}
+