drm/komeda: komeda_dev/pipeline/component definition and initialzation

1. Added a brief definition of komeda_dev/pipeline/component, this change
   didn't add the detailed component features and capabilities, which will
   be added in the following changes.
2. Corresponding resources discovery and initialzation functions.

Changes in v4:
- Deleted unnecessary headers

Changes in v3:
- Fixed style problem found by checkpatch.pl --strict.

Changes in v2:
- Unified abbreviation of "pipeline" to "pipe".

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
new file mode 100644
index 000000000000..4dec259cecac
--- /dev/null
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include "komeda_dev.h"
+
+struct komeda_dev *komeda_dev_create(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	const struct komeda_product_data *product;
+	struct komeda_dev *mdev;
+	struct resource *io_res;
+	int err = 0;
+
+	product = of_device_get_match_data(dev);
+	if (!product)
+		return ERR_PTR(-ENODEV);
+
+	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!io_res) {
+		DRM_ERROR("No registers defined.\n");
+		return ERR_PTR(-ENODEV);
+	}
+
+	mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
+	if (!mdev)
+		return ERR_PTR(-ENOMEM);
+
+	mdev->dev = dev;
+	mdev->reg_base = devm_ioremap_resource(dev, io_res);
+	if (IS_ERR(mdev->reg_base)) {
+		DRM_ERROR("Map register space failed.\n");
+		err = PTR_ERR(mdev->reg_base);
+		mdev->reg_base = NULL;
+		goto err_cleanup;
+	}
+
+	mdev->pclk = devm_clk_get(dev, "pclk");
+	if (IS_ERR(mdev->pclk)) {
+		DRM_ERROR("Get APB clk failed.\n");
+		err = PTR_ERR(mdev->pclk);
+		mdev->pclk = NULL;
+		goto err_cleanup;
+	}
+
+	/* Enable APB clock to access the registers */
+	clk_prepare_enable(mdev->pclk);
+
+	mdev->funcs = product->identify(mdev->reg_base, &mdev->chip);
+	if (!komeda_product_match(mdev, product->product_id)) {
+		DRM_ERROR("DT configured %x mismatch with real HW %x.\n",
+			  product->product_id,
+			  MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id));
+		err = -ENODEV;
+		goto err_cleanup;
+	}
+
+	DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
+		 MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
+		 MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
+		 MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
+
+	err = mdev->funcs->enum_resources(mdev);
+	if (err) {
+		DRM_ERROR("enumerate display resource failed.\n");
+		goto err_cleanup;
+	}
+
+	return mdev;
+
+err_cleanup:
+	komeda_dev_destroy(mdev);
+	return ERR_PTR(err);
+}
+
+void komeda_dev_destroy(struct komeda_dev *mdev)
+{
+	struct device *dev = mdev->dev;
+	struct komeda_dev_funcs *funcs = mdev->funcs;
+	int i;
+
+	for (i = 0; i < mdev->n_pipelines; i++) {
+		komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
+		mdev->pipelines[i] = NULL;
+	}
+
+	mdev->n_pipelines = 0;
+
+	if (funcs && funcs->cleanup)
+		funcs->cleanup(mdev);
+
+	if (mdev->reg_base) {
+		devm_iounmap(dev, mdev->reg_base);
+		mdev->reg_base = NULL;
+	}
+
+	if (mdev->mclk) {
+		devm_clk_put(dev, mdev->mclk);
+		mdev->mclk = NULL;
+	}
+
+	if (mdev->pclk) {
+		clk_disable_unprepare(mdev->pclk);
+		devm_clk_put(dev, mdev->pclk);
+		mdev->pclk = NULL;
+	}
+
+	devm_kfree(dev, mdev);
+}