drivers/media/platform/mtk-mdp/mtk_mdp_comp.c

   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
  17 static const char * const mtk_mdp_comp_stem[MTK_MDP_COMP_TYPE_MAX] = {
  18         "mdp_rdma",
  19         "mdp_rsz",
  20         "mdp_wdma",
  21         "mdp_wrot",
  22 };
  23
  24 struct mtk_mdp_comp_match {
  25         enum mtk_mdp_comp_type type;
  26         int alias_id;
  27 };
  28
  29 static const struct mtk_mdp_comp_match mtk_mdp_matches[MTK_MDP_COMP_ID_MAX] = {
  30         { MTK_MDP_RDMA, 0 },
  31         { MTK_MDP_RDMA, 1 },
  32         { MTK_MDP_RSZ,  0 },
  33         { MTK_MDP_RSZ,  1 },
  34         { MTK_MDP_RSZ,  2 },
  35         { MTK_MDP_WDMA, 0 },
  36         { MTK_MDP_WROT, 0 },
  37         { MTK_MDP_WROT, 1 },
  38 };
  39
  40 int mtk_mdp_comp_get_id(struct device *dev, struct device_node *node,
  41                         enum mtk_mdp_comp_type comp_type)
  42 {
  43         int id = of_alias_get_id(node, mtk_mdp_comp_stem[comp_type]);
  44         int i;
  45
  46         for (i = 0; i < ARRAY_SIZE(mtk_mdp_matches); i++) {
  47                 if (comp_type == mtk_mdp_matches[i].type &&
  48                     id == mtk_mdp_matches[i].alias_id)
  49                         return i;
  50         }
  51
  52         dev_err(dev, "Failed to get id. type: %d, id: %d\n", comp_type, id);
  53
  54         return -EINVAL;
  55 }
  56
  57 void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
  58 {
  59         int i, err;
  60
  61         if (comp->larb_dev) {
  62                 err = mtk_smi_larb_get(comp->larb_dev);
  63                 if (err)
  64                         dev_err(dev,
  65                                 "failed to get larb, err %d. type:%d id:%d\n",
  66                                 err, comp->type, comp->id);
  67         }
  68
  69         for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
  70                 if (IS_ERR(comp->clk[i]))
  71                         continue;
  72                 err = clk_prepare_enable(comp->clk[i]);
  73                 if (err)
  74                         dev_err(dev,
  75                         "failed to enable clock, err %d. type:%d id:%d i:%d\n",
  76                                 err, comp->type, comp->id, i);
  77         }
  78 }
  79
  80 void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
  81 {
  82         int i;
  83
  84         for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
  85                 if (IS_ERR(comp->clk[i]))
  86                         continue;
  87                 clk_disable_unprepare(comp->clk[i]);
  88         }
  89
  90         if (comp->larb_dev)
  91                 mtk_smi_larb_put(comp->larb_dev);
  92 }
  93
  94 int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
  95                       struct mtk_mdp_comp *comp, enum mtk_mdp_comp_id comp_id)
  96 {
  97         struct device_node *larb_node;
  98         struct platform_device *larb_pdev;
  99         int i;
 100
 101         if (comp_id < 0 || comp_id >= MTK_MDP_COMP_ID_MAX) {
 102                 dev_err(dev, "Invalid comp_id %d\n", comp_id);
 103                 return -EINVAL;
 104         }
 105
 106         comp->dev_node = of_node_get(node);
 107         comp->id = comp_id;
 108         comp->type = mtk_mdp_matches[comp_id].type;
 109         comp->regs = of_iomap(node, 0);
 110
 111         for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 112                 comp->clk[i] = of_clk_get(node, i);
 113
 114                 /* Only RDMA needs two clocks */
 115                 if (comp->type != MTK_MDP_RDMA)
 116                         break;
 117         }
 118
 119         /* Only DMA capable components need the LARB property */
 120         comp->larb_dev = NULL;
 121         if (comp->type != MTK_MDP_RDMA &&
 122             comp->type != MTK_MDP_WDMA &&
 123             comp->type != MTK_MDP_WROT)
 124                 return 0;
 125
 126         larb_node = of_parse_phandle(node, "mediatek,larb", 0);
 127         if (!larb_node) {
 128                 dev_err(dev,
 129                         "Missing mediadek,larb phandle in %pOF node\n", node);
 130                 return -EINVAL;
 131         }
 132
 133         larb_pdev = of_find_device_by_node(larb_node);
 134         if (!larb_pdev) {
 135                 dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
 136                 of_node_put(larb_node);
 137                 return -EPROBE_DEFER;
 138         }
 139         of_node_put(larb_node);
 140
 141         comp->larb_dev = &larb_pdev->dev;
 142
 143         return 0;
 144 }
 145
 146 void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
 147 {
 148         of_node_put(comp->dev_node);
 149 }