drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_hw.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2021 MediaTek Inc.
   4  * Author: Yunfei Dong <yunfei.dong@mediatek.com>
   5  */
   6
   7 #include <linux/interrupt.h>
   8 #include <linux/irq.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/pm_runtime.h>
  13 #include <linux/slab.h>
  14
  15 #include "mtk_vcodec_drv.h"
  16 #include "mtk_vcodec_dec.h"
  17 #include "mtk_vcodec_dec_hw.h"
  18 #include "mtk_vcodec_dec_pm.h"
  19 #include "mtk_vcodec_intr.h"
  20 #include "mtk_vcodec_util.h"
  21
  22 static const struct of_device_id mtk_vdec_hw_match[] = {
  23         {
  24                 .compatible = "mediatek,mtk-vcodec-lat",
  25                 .data = (void *)MTK_VDEC_LAT0,
  26         },
  27         {
  28                 .compatible = "mediatek,mtk-vcodec-core",
  29                 .data = (void *)MTK_VDEC_CORE,
  30         },
  31         {},
  32 };
  33 MODULE_DEVICE_TABLE(of, mtk_vdec_hw_match);
  34
  35 static int mtk_vdec_hw_prob_done(struct mtk_vcodec_dev *vdec_dev)
  36 {
  37         struct platform_device *pdev = vdec_dev->plat_dev;
  38         struct device_node *subdev_node;
  39         enum mtk_vdec_hw_id hw_idx;
  40         const struct of_device_id *of_id;
  41         int i;
  42
  43         for (i = 0; i < ARRAY_SIZE(mtk_vdec_hw_match); i++) {
  44                 of_id = &mtk_vdec_hw_match[i];
  45                 subdev_node = of_find_compatible_node(NULL, NULL,
  46                                                       of_id->compatible);
  47                 if (!subdev_node)
  48                         continue;
  49
  50                 of_node_put(subdev_node);
  51
  52                 hw_idx = (enum mtk_vdec_hw_id)(uintptr_t)of_id->data;
  53                 if (!test_bit(hw_idx, vdec_dev->subdev_bitmap)) {
  54                         dev_err(&pdev->dev, "vdec %d is not ready", hw_idx);
  55                         return -EAGAIN;
  56                 }
  57         }
  58
  59         return 0;
  60 }
  61
  62 static irqreturn_t mtk_vdec_hw_irq_handler(int irq, void *priv)
  63 {
  64         struct mtk_vdec_hw_dev *dev = priv;
  65         struct mtk_vcodec_ctx *ctx;
  66         u32 cg_status;
  67         unsigned int dec_done_status;
  68         void __iomem *vdec_misc_addr = dev->reg_base[VDEC_HW_MISC] +
  69                                         VDEC_IRQ_CFG_REG;
  70
  71         ctx = mtk_vcodec_get_curr_ctx(dev->main_dev, dev->hw_idx);
  72
  73         /* check if HW active or not */
  74         cg_status = readl(dev->reg_base[VDEC_HW_SYS]);
  75         if (cg_status & VDEC_HW_ACTIVE) {
  76                 mtk_v4l2_err("vdec active is not 0x0 (0x%08x)",
  77                              cg_status);
  78                 return IRQ_HANDLED;
  79         }
  80
  81         dec_done_status = readl(vdec_misc_addr);
  82         if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
  83             MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)
  84                 return IRQ_HANDLED;
  85
  86         /* clear interrupt */
  87         writel(dec_done_status | VDEC_IRQ_CFG, vdec_misc_addr);
  88         writel(dec_done_status & ~VDEC_IRQ_CLR, vdec_misc_addr);
  89
  90         wake_up_ctx(ctx, MTK_INST_IRQ_RECEIVED, dev->hw_idx);
  91
  92         mtk_v4l2_debug(3, "wake up ctx %d, dec_done_status=%x",
  93                        ctx->id, dec_done_status);
  94
  95         return IRQ_HANDLED;
  96 }
  97
  98 static int mtk_vdec_hw_init_irq(struct mtk_vdec_hw_dev *dev)
  99 {
 100         struct platform_device *pdev = dev->plat_dev;
 101         int ret;
 102
 103         dev->dec_irq = platform_get_irq(pdev, 0);
 104         if (dev->dec_irq < 0)
 105                 return dev->dec_irq;
 106
 107         irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
 108         ret = devm_request_irq(&pdev->dev, dev->dec_irq,
 109                                mtk_vdec_hw_irq_handler, 0, pdev->name, dev);
 110         if (ret) {
 111                 dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
 112                         dev->dec_irq, ret);
 113                 return ret;
 114         }
 115
 116         return 0;
 117 }
 118
 119 static int mtk_vdec_hw_probe(struct platform_device *pdev)
 120 {
 121         struct device *dev = &pdev->dev;
 122         struct mtk_vdec_hw_dev *subdev_dev;
 123         struct mtk_vcodec_dev *main_dev;
 124         const struct of_device_id *of_id;
 125         int hw_idx;
 126         int ret;
 127
 128         if (!dev->parent) {
 129                 dev_err(dev, "no parent for hardware devices.\n");
 130                 return -ENODEV;
 131         }
 132
 133         main_dev = dev_get_drvdata(dev->parent);
 134         if (!main_dev) {
 135                 dev_err(dev, "failed to get parent driver data");
 136                 return -EINVAL;
 137         }
 138
 139         subdev_dev = devm_kzalloc(dev, sizeof(*subdev_dev), GFP_KERNEL);
 140         if (!subdev_dev)
 141                 return -ENOMEM;
 142
 143         subdev_dev->plat_dev = pdev;
 144         ret = mtk_vcodec_init_dec_clk(pdev, &subdev_dev->pm);
 145         if (ret)
 146                 return ret;
 147         pm_runtime_enable(&pdev->dev);
 148
 149         of_id = of_match_device(mtk_vdec_hw_match, dev);
 150         if (!of_id) {
 151                 dev_err(dev, "Can't get vdec subdev id.\n");
 152                 ret = -EINVAL;
 153                 goto err;
 154         }
 155
 156         hw_idx = (enum mtk_vdec_hw_id)(uintptr_t)of_id->data;
 157         if (hw_idx >= MTK_VDEC_HW_MAX) {
 158                 dev_err(dev, "Hardware index %d not correct.\n", hw_idx);
 159                 ret = -EINVAL;
 160                 goto err;
 161         }
 162
 163         main_dev->subdev_dev[hw_idx] = subdev_dev;
 164         subdev_dev->hw_idx = hw_idx;
 165         subdev_dev->main_dev = main_dev;
 166         subdev_dev->reg_base[VDEC_HW_SYS] = main_dev->reg_base[VDEC_HW_SYS];
 167         set_bit(subdev_dev->hw_idx, main_dev->subdev_bitmap);
 168
 169         ret = mtk_vdec_hw_init_irq(subdev_dev);
 170         if (ret)
 171                 goto err;
 172
 173         subdev_dev->reg_base[VDEC_HW_MISC] =
 174                 devm_platform_ioremap_resource(pdev, 0);
 175         if (IS_ERR((__force void *)subdev_dev->reg_base[VDEC_HW_MISC])) {
 176                 ret = PTR_ERR((__force void *)subdev_dev->reg_base[VDEC_HW_MISC]);
 177                 goto err;
 178         }
 179
 180         if (!main_dev->subdev_prob_done)
 181                 main_dev->subdev_prob_done = mtk_vdec_hw_prob_done;
 182
 183         platform_set_drvdata(pdev, subdev_dev);
 184         return 0;
 185 err:
 186         pm_runtime_disable(subdev_dev->pm.dev);
 187         return ret;
 188 }
 189
 190 static struct platform_driver mtk_vdec_driver = {
 191         .probe  = mtk_vdec_hw_probe,
 192         .driver = {
 193                 .name   = "mtk-vdec-comp",
 194                 .of_match_table = mtk_vdec_hw_match,
 195         },
 196 };
 197 module_platform_driver(mtk_vdec_driver);
 198
 199 MODULE_LICENSE("GPL v2");
 200 MODULE_DESCRIPTION("Mediatek video decoder hardware driver");