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

   1 /*
   2  * Copyright (c) 2016 MediaTek Inc.
   3  * Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/device.h>
  17 #include <linux/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_platform.h>
  20 #include <soc/mediatek/smi.h>
  21
  22 #include "mtk_mdp_comp.h"
  23
  24
  25 static const char * const mtk_mdp_comp_stem[MTK_MDP_COMP_TYPE_MAX] = {
  26         "mdp_rdma",
  27         "mdp_rsz",
  28         "mdp_wdma",
  29         "mdp_wrot",
  30 };
  31
  32 struct mtk_mdp_comp_match {
  33         enum mtk_mdp_comp_type type;
  34         int alias_id;
  35 };
  36
  37 static const struct mtk_mdp_comp_match mtk_mdp_matches[MTK_MDP_COMP_ID_MAX] = {
  38         { MTK_MDP_RDMA, 0 },
  39         { MTK_MDP_RDMA, 1 },
  40         { MTK_MDP_RSZ,  0 },
  41         { MTK_MDP_RSZ,  1 },
  42         { MTK_MDP_RSZ,  2 },
  43         { MTK_MDP_WDMA, 0 },
  44         { MTK_MDP_WROT, 0 },
  45         { MTK_MDP_WROT, 1 },
  46 };
  47
  48 int mtk_mdp_comp_get_id(struct device *dev, struct device_node *node,
  49                         enum mtk_mdp_comp_type comp_type)
  50 {
  51         int id = of_alias_get_id(node, mtk_mdp_comp_stem[comp_type]);
  52         int i;
  53
  54         for (i = 0; i < ARRAY_SIZE(mtk_mdp_matches); i++) {
  55                 if (comp_type == mtk_mdp_matches[i].type &&
  56                     id == mtk_mdp_matches[i].alias_id)
  57                         return i;
  58         }
  59
  60         dev_err(dev, "Failed to get id. type: %d, id: %d\n", comp_type, id);
  61
  62         return -EINVAL;
  63 }
  64
  65 void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
  66 {
  67         int i, err;
  68
  69         if (comp->larb_dev) {
  70                 err = mtk_smi_larb_get(comp->larb_dev);
  71                 if (err)
  72                         dev_err(dev,
  73                                 "failed to get larb, err %d. type:%d id:%d\n",
  74                                 err, comp->type, comp->id);
  75         }
  76
  77         for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
  78                 if (!comp->clk[i])
  79                         continue;
  80                 err = clk_prepare_enable(comp->clk[i]);
  81                 if (err)
  82                         dev_err(dev,
  83                         "failed to enable clock, err %d. type:%d id:%d i:%d\n",
  84                                 err, comp->type, comp->id, i);
  85         }
  86 }
  87
  88 void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
  89 {
  90         int i;
  91
  92         for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
  93                 if (!comp->clk[i])
  94                         continue;
  95                 clk_disable_unprepare(comp->clk[i]);
  96         }
  97
  98         if (comp->larb_dev)
  99                 mtk_smi_larb_put(comp->larb_dev);
 100 }
 101
 102 int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
 103                       struct mtk_mdp_comp *comp, enum mtk_mdp_comp_id comp_id)
 104 {
 105         struct device_node *larb_node;
 106         struct platform_device *larb_pdev;
 107         int i;
 108
 109         if (comp_id < 0 || comp_id >= MTK_MDP_COMP_ID_MAX) {
 110                 dev_err(dev, "Invalid comp_id %d\n", comp_id);
 111                 return -EINVAL;
 112         }
 113
 114         comp->dev_node = of_node_get(node);
 115         comp->id = comp_id;
 116         comp->type = mtk_mdp_matches[comp_id].type;
 117         comp->regs = of_iomap(node, 0);
 118
 119         for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
 120                 comp->clk[i] = of_clk_get(node, i);
 121
 122                 /* Only RDMA needs two clocks */
 123                 if (comp->type != MTK_MDP_RDMA)
 124                         break;
 125         }
 126
 127         /* Only DMA capable components need the LARB property */
 128         comp->larb_dev = NULL;
 129         if (comp->type != MTK_MDP_RDMA &&
 130             comp->type != MTK_MDP_WDMA &&
 131             comp->type != MTK_MDP_WROT)
 132                 return 0;
 133
 134         larb_node = of_parse_phandle(node, "mediatek,larb", 0);
 135         if (!larb_node) {
 136                 dev_err(dev,
 137                         "Missing mediadek,larb phandle in %s node\n",
 138                         node->full_name);
 139                 return -EINVAL;
 140         }
 141
 142         larb_pdev = of_find_device_by_node(larb_node);
 143         if (!larb_pdev) {
 144                 dev_warn(dev, "Waiting for larb device %s\n",
 145                          larb_node->full_name);
 146                 of_node_put(larb_node);
 147                 return -EPROBE_DEFER;
 148         }
 149         of_node_put(larb_node);
 150
 151         comp->larb_dev = &larb_pdev->dev;
 152
 153         return 0;
 154 }
 155
 156 void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
 157 {
 158         of_node_put(comp->dev_node);
 159 }