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path: root/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
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Diffstat (limited to 'drivers/media/platform/mtk-mdp/mtk_mdp_comp.c')
-rw-r--r--drivers/media/platform/mtk-mdp/mtk_mdp_comp.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
new file mode 100644
index 000000000000..aa8f9fd1f1a2
--- /dev/null
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <soc/mediatek/smi.h>
+
+#include "mtk_mdp_comp.h"
+
+
+static const char * const mtk_mdp_comp_stem[MTK_MDP_COMP_TYPE_MAX] = {
+ "mdp_rdma",
+ "mdp_rsz",
+ "mdp_wdma",
+ "mdp_wrot",
+};
+
+struct mtk_mdp_comp_match {
+ enum mtk_mdp_comp_type type;
+ int alias_id;
+};
+
+static const struct mtk_mdp_comp_match mtk_mdp_matches[MTK_MDP_COMP_ID_MAX] = {
+ { MTK_MDP_RDMA, 0 },
+ { MTK_MDP_RDMA, 1 },
+ { MTK_MDP_RSZ, 0 },
+ { MTK_MDP_RSZ, 1 },
+ { MTK_MDP_RSZ, 2 },
+ { MTK_MDP_WDMA, 0 },
+ { MTK_MDP_WROT, 0 },
+ { MTK_MDP_WROT, 1 },
+};
+
+int mtk_mdp_comp_get_id(struct device *dev, struct device_node *node,
+ enum mtk_mdp_comp_type comp_type)
+{
+ int id = of_alias_get_id(node, mtk_mdp_comp_stem[comp_type]);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mtk_mdp_matches); i++) {
+ if (comp_type == mtk_mdp_matches[i].type &&
+ id == mtk_mdp_matches[i].alias_id)
+ return i;
+ }
+
+ dev_err(dev, "Failed to get id. type: %d, id: %d\n", comp_type, id);
+
+ return -EINVAL;
+}
+
+void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
+{
+ int i, err;
+
+ if (comp->larb_dev) {
+ err = mtk_smi_larb_get(comp->larb_dev);
+ if (err)
+ dev_err(dev,
+ "failed to get larb, err %d. type:%d id:%d\n",
+ err, comp->type, comp->id);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
+ if (!comp->clk[i])
+ continue;
+ err = clk_prepare_enable(comp->clk[i]);
+ if (err)
+ dev_err(dev,
+ "failed to enable clock, err %d. type:%d id:%d i:%d\n",
+ err, comp->type, comp->id, i);
+ }
+}
+
+void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
+ if (!comp->clk[i])
+ continue;
+ clk_disable_unprepare(comp->clk[i]);
+ }
+
+ if (comp->larb_dev)
+ mtk_smi_larb_put(comp->larb_dev);
+}
+
+int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
+ struct mtk_mdp_comp *comp, enum mtk_mdp_comp_id comp_id)
+{
+ struct device_node *larb_node;
+ struct platform_device *larb_pdev;
+ int i;
+
+ if (comp_id < 0 || comp_id >= MTK_MDP_COMP_ID_MAX) {
+ dev_err(dev, "Invalid comp_id %d\n", comp_id);
+ return -EINVAL;
+ }
+
+ comp->dev_node = of_node_get(node);
+ comp->id = comp_id;
+ comp->type = mtk_mdp_matches[comp_id].type;
+ comp->regs = of_iomap(node, 0);
+
+ for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
+ comp->clk[i] = of_clk_get(node, i);
+
+ /* Only RDMA needs two clocks */
+ if (comp->type != MTK_MDP_RDMA)
+ break;
+ }
+
+ /* Only DMA capable components need the LARB property */
+ comp->larb_dev = NULL;
+ if (comp->type != MTK_MDP_RDMA &&
+ comp->type != MTK_MDP_WDMA &&
+ comp->type != MTK_MDP_WROT)
+ return 0;
+
+ larb_node = of_parse_phandle(node, "mediatek,larb", 0);
+ if (!larb_node) {
+ dev_err(dev,
+ "Missing mediadek,larb phandle in %s node\n",
+ node->full_name);
+ return -EINVAL;
+ }
+
+ larb_pdev = of_find_device_by_node(larb_node);
+ if (!larb_pdev) {
+ dev_warn(dev, "Waiting for larb device %s\n",
+ larb_node->full_name);
+ of_node_put(larb_node);
+ return -EPROBE_DEFER;
+ }
+ of_node_put(larb_node);
+
+ comp->larb_dev = &larb_pdev->dev;
+
+ return 0;
+}
+
+void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
+{
+ of_node_put(comp->dev_node);
+}