diff options
Diffstat (limited to 'drivers/media/platform/mtk-mdp/mtk_mdp_comp.c')
| -rw-r--r-- | drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 157 |
1 files changed, 157 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 000000000..03aba03a2 --- /dev/null +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c @@ -0,0 +1,157 @@ +/* + * 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 (IS_ERR(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 (IS_ERR(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 %pOF node\n", node); + return -EINVAL; + } + + larb_pdev = of_find_device_by_node(larb_node); + if (!larb_pdev) { + dev_warn(dev, "Waiting for larb device %pOF\n", larb_node); + 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); +} |