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