LXR linux/drivers/media/platform/mtk-mdp/mtk_mdp

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2016 MediaTek Inc.
   4 * Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
   5 */
   6
   7#include <linux/clk.h>
   8#include <linux/device.h>
   9#include <linux/of.h>
  10#include <linux/of_address.h>
  11#include <linux/of_platform.h>
  12#include <soc/mediatek/smi.h>
  13
  14#include "mtk_mdp_comp.h"
  15
  16
  17void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
  18{
  19        int i, err;
  20
  21        if (comp->larb_dev) {
  22                err = mtk_smi_larb_get(comp->larb_dev);
  23                if (err)
  24                        dev_err(dev,
  25                                "failed to get larb, err %d. type:%d\n",
  26                                err, comp->type);
  27        }
  28
  29        for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
  30                if (IS_ERR(comp->clk[i]))
  31                        continue;
  32                err = clk_prepare_enable(comp->clk[i]);
  33                if (err)
  34                        dev_err(dev,
  35                        "failed to enable clock, err %d. type:%d i:%d\n",
  36                                err, comp->type, i);
  37        }
  38}
  39
  40void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
  41{
  42        int i;
  43
  44        for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
  45                if (IS_ERR(comp->clk[i]))
  46                        continue;
  47                clk_disable_unprepare(comp->clk[i]);
  48        }
  49
  50        if (comp->larb_dev)
  51                mtk_smi_larb_put(comp->larb_dev);
  52}
  53
  54int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
  55                      struct mtk_mdp_comp *comp,
  56                      enum mtk_mdp_comp_type comp_type)
  57{
  58        struct device_node *larb_node;
  59        struct platform_device *larb_pdev;
  60        int ret;
  61        int i;
  62
  63        comp->dev_node = of_node_get(node);
  64        comp->type = comp_type;
  65
  66        for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
  67                comp->clk[i] = of_clk_get(node, i);
  68                if (IS_ERR(comp->clk[i])) {
  69                        if (PTR_ERR(comp->clk[i]) != -EPROBE_DEFER)
  70                                dev_err(dev, "Failed to get clock\n");
  71                        ret = PTR_ERR(comp->clk[i]);
  72                        goto put_dev;
  73                }
  74
  75                /* Only RDMA needs two clocks */
  76                if (comp->type != MTK_MDP_RDMA)
  77                        break;
  78        }
  79
  80        /* Only DMA capable components need the LARB property */
  81        comp->larb_dev = NULL;
  82        if (comp->type != MTK_MDP_RDMA &&
  83            comp->type != MTK_MDP_WDMA &&
  84            comp->type != MTK_MDP_WROT)
  85                return 0;
  86
  87        larb_node = of_parse_phandle(node, "mediatek,larb", 0);
  88        if (!larb_node) {
  89                dev_err(dev,
  90                        "Missing mediadek,larb phandle in %pOF node\n", node);
  91                ret = -EINVAL;
  92                goto put_dev;
  93        }
  94
  95        larb_pdev = of_find_device_by_node(larb_node);
  96        if (!larb_pdev) {
  97                dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
  98                of_node_put(larb_node);
  99                ret = -EPROBE_DEFER;
 100                goto put_dev;
 101        }
 102        of_node_put(larb_node);
 103
 104        comp->larb_dev = &larb_pdev->dev;
 105
 106        return 0;
 107
 108put_dev:
 109        of_node_put(comp->dev_node);
 110
 111        return ret;
 112}
 113
 114void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
 115{
 116        of_node_put(comp->dev_node);
 117}
 118